Dissertations / Theses on the topic 'Service of queues'
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Magalhaes, Marcos N. "Queues with a Markov renewal service process." Diss., Virginia Polytechnic Institute and State University, 1988. http://hdl.handle.net/10919/53582.
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In the present work, we study a queue with a Markov renewal service process. The objective is to model systems where different customers request different services and there is a setup time required to adjust from one type of service to the next.
The arrival is a Poisson process independent of the service. After arrival, all the customers will be attended in order of arrival. Immediately before a service starts, the type of next customer is chosen using a finite, irreducible and aperiodic Markov chain P. There is only one server and the service time has a distribution function Fij, where i and j are the types of the previous and current customer in service, respectively. This model will be called M/MR/l.
Embedding at departure epochs, we characterize the queue length and the type of customer as a Markov renewal process. We study a special case where Fij, is exponential with parameter μij. We prove that the departure is a renewal process if and only if μij = μ , A i j ε E. Furthermore, we show that this renewal is a Poisson process. The type-departure process is extensively studied through the respective counting processes. The crosscovariance and the crosscorrelation are computed and numerical results are shown. Finally, we introduce several expressions to study the interdependence among the type·departure processes in the general case, i.e. the distribution function Fij, does not have any special form.Ph. D.
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Chang, Kuo-Hwa. "Extreme queues and stationarity of heavy-traffic service systems." Diss., Georgia Institute of Technology, 1992. http://hdl.handle.net/1853/25441.
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Yudovina, Elena. "Collaborating queues : large service network and a limit order book." Thesis, University of Cambridge, 2012. https://www.repository.cam.ac.uk/handle/1810/243943.
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We analyse the steady-state behaviour of two different models with collaborating queues: that is, models in which 'customers' can be served by many types of 'servers', and 'servers' can process many types of 'customers'. The first example is a large-scale service system, such as a call centre. Collaboration is the result of cross-trained staff attending to several different types of incoming calls. We first examine a load-balancing policy, which aims to keep servers in different pools equally busy. Although the policy behaves order-optimally over fixed time horizons, we show that the steady-state distribution may fail to be tight on the diffusion scale. That is, in a family of ever-larger networks whose arrival rates grow as O(r) (where r is a scaling parameter growing to infinity), the sequence of steady-state deviations from equilibrium scaled down by sqrt(r) is not tight. We then propose a different policy, for which we show that the sequence of invariant distributions is tight on the r (1/2+epsilon) scale, for any epsilon > 0. For this policy we conjecture that tightness holds on the diffusion scale as well. The second example models a limit order book, a pricing mechanism for a single-commodity market in which buyers (respectively sellers) are prepared to wait for the price to drop (respectively rise). We analyse the behaviour of a simplified model, in which the arrival events are independent of each other and the state of the limit order book. The system can be represented by a queueing model, with 'customers' and 'servers' corresponding to bids and asks; the roles of customers and servers are symmetric. We show that, with probability 1, the price interval breaks up into three regions. At small (respectively large) prices, only finitely many bid (respectively ask) orders ever get fulfilled, while in the middle region all orders eventually clear. We derive equations which define the boundaries between these regions, and solve them explicitly in the case of iid uniform arrivals to obtain numeric values of the thresholds. We derive a heuristic for the distribution of the highest bid (respectively lowest ask), and present simulation data confirming it.
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Zhang, Bo. "Scalable analysis and design of service systems." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/39533.
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In this dissertation, we develop analytical and computational tools for performance analysis and design of large-scale service systems. The dissertation consists of three main chapters.
The first chapter is devoted to devising efficient task assignment policies for large-scale service system models from a rare event analysis standpoint. Specifically, we study the steady-state behavior of multi-server queues with general job size distributions under size-interval task assignment (SITA) policies. Assuming Poisson arrivals and the existence of the alpha-th moment of the job size distribution for some alpha> 1, we show that if the job arrival rate and the number of servers increase to infinity with the traffic intensity held fixed, a SITA policy parameterized by alpha minimizes in a large deviation sense the steady-state probability that the total number of jobs in the system is greater than or equal to the number of servers. The optimal large deviation decay rate can be arbitrarily close to the one for the corresponding probability in an infinite-server queue, which only depends on the system traffic intensity but not on any higher moments of the job size distribution. This supports in a many-server asymptotic framework the common wisdom that separating large jobs from small jobs protects system performance against job size variability.
In the second chapter, we study constraint satisfaction problems for a Markovian parallel-server queueing model with impatient customers, motivated by large telephone call centers. To minimize the staffing level subject to different service-level constraints, we propose refined square-root staffing (SRS) rules, which preserve the insightfulness and computational scalability of the celebrated SRS principle and yet achieve a stronger form of optimality. In particular, using asymptotic series expansion techniques, we first develop refinements to a set of asymptotic performance approximations recently used in analyzing large call centers, namely, the Quality and Efficiency Driven (QED) diffusion approximations. We then use the improved performance approximations to explicitly characterize the error of conventional SRS and further obtain the refined SRS rules. Finally, we demonstrate how the explicit form of the staffing refinements enables an analytical assessment of the accuracy of conventional SRS and its underlying QED approximation.
In the third chapter, we study a fluid model for many-server Markovian queues in changing environments, which can be used to model large-scale service systems with customer abandonments and time-varying arrivals. We obtain the stationary distribution of the fluid model, which refines and is shown to converge, as the environment changing rate vanishes in a proper way, to a simple discrete bimodal approximation. We also prove that the fluid model arises as a law of large number limit in a many-server asymptotic regime.
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Blanc, Alberto P. "Quality of service guarantees for FIFO queues with constrained inputs." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3230036.
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Thesis (Ph. D.)--University of California, San Diego, 2006.Title from first page of PDF file (viewed November 17, 2006). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 88-90).
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Brahimi, Mammar. "Approximating multi-server queues with inhomgeneous arrival rates and continuous service time distributions." Thesis, Lancaster University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254028.
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Gao, Xuefeng. "Stochastic models for service systems and limit order books." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50238.
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Stochastic fluctuations can have profound impacts on engineered systems. Nonetheless, we can achieve significant benefits such as cost reduction based upon
expanding our fundamental knowledge of stochastic systems. The primary goal of this thesis is to contribute to our understanding by developing and analyzing stochastic models for specific types of engineered systems. The knowledge gained can help
management to optimize decision making under uncertainty.
This thesis has three parts. In Part I, we study many-server queues that model large-scale service systems such as call centers. We focus on the positive recurrence of
piecewise Ornstein-Uhlenbeck (OU) processes and the validity of using these processes to predict the steady-state performance of the corresponding many-server queues. In Part II, we investigate diffusion processes constrained to the positive orthant under infinitesimal changes in the drift.
This sensitivity analysis on the drift helps us understand how changes in service capacities at individual stations in a stochastic network would affect the steady-state queue-length distributions. In Part III, we
study the trading mechanism known as limit order book. We are motivated by a desire to better understand the interplay among order flow rates, liquidity fluctuation, and optimal executions. The goal is to characterize the temporal evolution of order
book shape on the “macroscopic” time scale.
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Tronarp, Otto. "Quality of Service in Ad Hoc Networks by Priority Queuing." Thesis, Linköping University, Department of Electrical Engineering, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-1638.
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The increasing usage of information technology in military affairs raises the need for robust high capacity radio networks. The network will be used to provide several different types of services, for example group calls and situation awareness services. All services have specific demands on packet delays and packet losses in order to be fully functional, and therefore there is a need for a Quality of Service (QoS) mechanism in the network.
In this master thesis we examine the possibility to provide a QoS mechanism in Ad Hoc networks by using priority queues. The study includes two different queuing schemes, namely fixed priority queuing and weighted fair queuing. The performance of the two queuing schemes are evaluated and compared with respect to the ability to provide differentiation in network delay, i.e., provide high priority traffic with lower delays than low priority traffic. The study is mainly done by simulations, but for fixed priority queuing we also derive a analytical approximation of the network delay.
Our simulations show that fixed priority queuing provides a sharp delay differentiation between service classes, while weighted fair queuing gives the ability to control the delay differentiation. One of those queuing schemes alone might not be the best solution for providing QoS, instead we suggest that a combination of them is used.
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Dahm, Martin Verfasser], Daniel [Akademischer Betreuer] [Wentzel, and Torsten Oliver [Akademischer Betreuer] Salge. "Breathing down your neck : the impact of queues on customers using a service / Martin Dahm ; Daniel Wentzel, Torsten Oliver Salge." Aachen : Universitätsbibliothek der RWTH Aachen, 2015. http://d-nb.info/1126729736/34.
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Dahm, Martin [Verfasser], Daniel [Akademischer Betreuer] Wentzel, and Torsten Oliver [Akademischer Betreuer] Salge. "Breathing down your neck : the impact of queues on customers using a service / Martin Dahm ; Daniel Wentzel, Torsten Oliver Salge." Aachen : Universitätsbibliothek der RWTH Aachen, 2015. http://d-nb.info/1126729736/34.
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Šilanskas, Žygimantas. "Servisų bendravimas pagrįstas trečių šalių komponentais." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20100813_113137-59758.
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Šiuolaikinio verslo sektorius yra labai sudėtingas, kadangi daugybė programinės ir kompiuterinės įrangos yra naudojama skirtingose platformose: internetinių sistemų bendravimui, verslo sistemų integravimui ir t. t. Dauguma šiuolaikinės programinės įrangos priklauso paskirstytų sistemų tipui. Ją sudaro kliento-serverio architektūra. Nagrinėjant konkrečią paskirstytą sistemą, joje klientų ir serverių kiekis gali būti gausus. Tokio tipo sistemos turi labai daug privalumų, tačiau turi ir trūkumų. Paprastai paskirstytas sistemas sudaro ne viena duomenų bazė, veikia daug servisų, kurie ne visada gali būti pasiekiami, visa tai yra galimų klaidų šaltinis. Kliento programinė įranga bendrauja tarp įvairių programinės įrangos komponentų (pavyzdžiui servisų), kaip ir jie tarpusavyje, naudodama nuotolinių procedūrų kvietimo technologijas ir žinutes.
Naudojant žinučių technologiją, bendravimas tarp servisų gali būti daug patikimesnis, kadangi ši technologija užtikrina žinutės pristatymą, net ir tada, kai gavėjas yra už ryšio ribų. Šiuolaikinėse servisais paremtose sistemose, bendravimas tarp komponentų yra paremtas žinučių, naudojančių eiles, metodu.
Šiame darbe bus nagrinėjama bendravimo tarp komponentų technologija, kuri paremta žinutėmis. Taip pat bus apžvelgiamos ir nagrinėjamos trečių šalių sukurtos, nemokamos technologijos, kurios skirtos bendravimui tarp paskirstytų sistemų komponentų žinučių metodu. Kadangi magistrinio darbo sistema buvo sukurta naudojant Microsoft technologijas... [toliau žr. visą tekstą]Nowadays a lot of systems are residing in distributed environments. These systems are composed of the client side software and server side software. That is called distributed systems architecture. Those types of systems can contain many services and many clients and may be substituted of many databases and many services. Distributed software components do not always run at the same time, networks, especially wide-area networks, are not always available and reliable. These parts communicate using remote procedure calls, or request/response messages and message queues. In this work we research third party components which are used to communicate between parts of distributed systems using messages and Microsoft message queues. The research is performed on two chosen components, which best fits in the developed system’s context. The choice of components and research based on usability problems using developed system called Business layer framework. The obtained results evaluated using user recommendation form.
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Abdel-Jaber, Hussein F. "Performance Modelling and Evaluation of Active Queue Management Techniques in Communication Networks. The development and performance evaluation of some new active queue management methods for internet congestion control based on fuzzy logic and random early detection using discrete-time queueing analysis and simulation." Thesis, University of Bradford, 2009. http://hdl.handle.net/10454/4261.
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Since the field of computer networks has rapidly grown in the last two decades, congestion control of traffic loads within networks has become a high priority. Congestion occurs in network routers when the number of incoming packets exceeds the available network resources, such as buffer space and bandwidth allocation. This may result in a poor network performance with reference to average packet queueing delay, packet loss rate and throughput. To enhance the performance when the network becomes congested, several different active queue management (AQM) methods have been proposed and some of these are discussed in this thesis. Specifically, these AQM methods are surveyed in detail and their strengths and limitations are highlighted. A comparison is conducted between five known AQM methods, Random Early Detection (RED), Gentle Random Early Detection (GRED), Adaptive Random Early Detection (ARED), Dynamic Random Early Drop (DRED) and BLUE, based on several performance measures, including mean queue length, throughput, average queueing delay, overflow packet loss probability, packet dropping probability and the total of overflow loss and dropping probabilities for packets, with the aim of identifying which AQM method gives the most satisfactory results of the performance measures. This thesis presents a new AQM approach based on the RED algorithm that determines and controls the congested router buffers in an early stage. This approach is called Dynamic RED (REDD), which stabilises the average queue length between minimum and maximum threshold positions at a certain level called the target level to prevent building up the queues in the router buffers. A comparison is made between the proposed REDD, RED and ARED approaches regarding the above performance measures. Moreover, three methods based on RED and fuzzy logic are proposed to control the congested router buffers incipiently. These methods are named REDD1, REDD2, and REDD3 and their performances are also compared with RED using the above performance measures to identify which method achieves the most satisfactory results. Furthermore, a set of discrete-time queue analytical models are developed based on the following approaches: RED, GRED, DRED and BLUE, to detect the congestion at router buffers in an early stage. The proposed analytical models use the instantaneous queue length as a congestion measure to capture short term changes in the input and prevent packet loss due to overflow. The proposed analytical models are experimentally compared with their corresponding AQM simulations with reference to the above performance measures to identify which approach gives the most satisfactory results. The simulations for RED, GRED, ARED, DRED, BLUE, REDD, REDD1, REDD2 and REDD3 are run ten times, each time with a change of seed and the results of each run are used to obtain mean values, variance, standard deviation and 95% confidence intervals. The performance measures are calculated based on data collected only after the system has reached a steady state. After extensive experimentation, the results show that the proposed REDD, REDD1, REDD2 and REDD3 algorithms and some of the proposed analytical models such as DRED-Alpha, RED and GRED models offer somewhat better results of mean queue length and average queueing delay than these achieved by RED and its variants when the values of packet arrival probability are greater than the value of packet departure probability, i.e. in a congestion situation. This suggests that when traffic is largely of a non bursty nature, instantaneous queue length might be a better congestion measure to use rather than the average queue length as in the more traditional models.
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Encarnação, Alan Ferreira da. "APLICAÇÃO DE SIMULAÇÃO DISCRETA PARA A GESTÃO DE FILAS NO SETOR DE SERVIÇOS: ESTUDO DE UM RESTAURANTE SELF-SERVICE." Pontifícia Universidade Católica de Goiás, 2015. http://localhost:8080/tede/handle/tede/2476.
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Previous issue date: 2015-08-18This paper discusses the application of discrete simulation for the management of queues in the service sector. Some service providers do not correctly dimensioning its service capacity generating queues. The efficient management of queues assists managers in making decisions. The characteristics of services and their important activities are addressed, aiming to demonstrate the Computational Simulation utility to find a balance that satisfies the customer and is economically viable for the service manager. The study object is a self-service restaurant. Through the Software ARENA was developed a model of discrete type and stochastic to play everyday restaurant setting. It concludes that the discrete simulation software has modeling elements that meets the application requirements. The studied restaurant has different characteristics from traditional self-service with layout in series, and it was necessary to provide the model a route for the flow of customers. The study concluded that the queues occur in the mass preparation process, special meat preparation and boxes, with average waiting times of up to 5 minutes. In the other processes, which are trim service, salad - dessert, scale and location of a table - chair is available, the queues have a very agile flow. The operating model obtained allowed the evaluation of some scenarios aiming to reduce the queue time.
Este trabalho discute a aplicação da simulação discreta para a gestão de filas no setor de serviços. Alguns prestadores de serviços não dimensionam corretamente sua capacidade de atendimento gerando assim as filas. A gestão eficiente das filas auxilia os gestores na tomada de decisões. São abordadas as características das atividades de serviços e sua importância, tendo como objetivo demonstrar a utilidade da Simulação Computacional para se encontrar um ponto de equilíbrio que satisfaça o cliente e seja viável economicamente para o gestor do serviço. O objeto de estudo é um restaurante selfservice. Através do Software ARENA foi desenvolvido um modelo do tipo discreto e estocástico para reproduzir o ambiente diário do Restaurante. Conclui-se que o software de simulação discreta possui elementos de modelagem que atende as necessidades da aplicação. O restaurante estudado possui características diferentes do tradicional selfservice com layout em série, e foi necessário prever no modelo um roteamento para o fluxo de clientes. O estudo concluiu que as filas ocorrem nos processos de preparo de massas, preparo de carnes especiais e caixas, com tempos médios de espera de até 5min. Nos demais processos, que são serviço de guarnição, salada-sobremesa, balança e localização de uma mesa-com cadeira disponível, as filas possuem um fluxo bem ágil. O modelo operacional obtido permitiu a avaliação de alguns cenários visando diminuição do tempo de fila.
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Joshi, Manali Beard Cory. "Reducing queue-fill variability for quality of service in a differentiated services network." Diss., UMK access, 2004.
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Thesis (M.S.)--School of Computing and Engineering. University of Missouri--Kansas City, 2004."A thesis in computer science." Typescript. Advisor: Cory Beard. Vita. Title from "catalog record" of the print edition Description based on contents viewed Feb. 24, 2006. Includes bibliographical references (leaves 76-80). Online version of the print edition.
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Phirke, Vishal Vasudeo. "Traffic Sensitive Active Queue Management for Improved Quality of Service." Digital WPI, 2002. https://digitalcommons.wpi.edu/etd-theses/780.
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The Internet, traditionally FTP, e-mail and Web traffic, is increasingly supporting emerging applications such as IP telephony, video conferencing and online games. These new genres of applications have different requirements in terms of throughput and delay than traditional applications. For example, interactive multimedia applications, unlike traditional applications, have more stringent delay constraints and less stringent loss constraints. Unfortunately, the current Internet offers a monolithic best-effort service to all applications without considering their specific requirements. Adaptive RED (ARED) is an Active Queue Management (AQM) technique, which optimizes the router for throughput. Throughput optimization provides acceptable QoS for traditional throughput sensitive applications, but is unfair for these new delay sensitive applications. While previous work has used different classes of QoS at the router to accommodate applications with varying requirements, thus far all have provided just 2 or 3 classes of service for applications to choose from. We propose two AQM mechanisms to optimize router for better overall QoS. Our first mechanism, RED-Worcester, is a simple extension to ARED in order to tune ARED for better average QoS support. Our second mechanism, REDBoston, further extends RED-Worcester to improve the QoS for all flows. Unlike earlier approaches, we do not predefine classes of service, but instead provide a continuum from which applications can choose. We evaluate our approach using NS-2 and present results showing the amount of improvement in QoS achieved by our mechanisms over ARED.
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Neely, Michael J. (Michael James) 1975. "Queue occupancy in single-server deterministic service time tree networks." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9318.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.Includes bibliographical references (p. 167).
Tree networks of single server, deterministic service time queues are often used as models for packet flow in systems with ATM traffic. In this thesis, we present methods of analyzing packet occupancy in these systems. We develop general theorems which enable the analysis of individual nodes within a multi-stage system to be reduced to the analysis of a simpler single-stage or 2- stage equivalent model. In these theorems, we make very few assumptions about the nature of the exogenous input processes themselves, and hence our results apply to a variety of input sources. In particular, we treat three input source cases: bursty on/off inputs, periodic continuous bit rate (CBR) inputs, and discrete time Generalized Independent (GI) inputs. For each of these input sources, we derive mean queue lengths for individual nodes and aggregate occupancy distribution functions for multi-stage systems. For GI-type inputs (which includes memoryless inputs), we derive explicit expressions for the means and variances of packet occupancy in any node of a multi-stage, deterministic service time tree network. We also create a general definition of a "distributable input," which includes any collection of M sources which run independently and are identically distributed (iid) according to some arbitrary type of arrival process (in particular, this includes periodic CBR sources). We demonstrate that the expected occupancy of a single-stage system is a convex, monotonic function of the distributable input loading. Furthermore, the expected occupancy of any node within a multi-stage tree network is a concave function of the multiple exogenous input loadings at the upstream nodes.
by Michael J. Neely.
S.M.
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Luu, Thuy-Mai. "Use of special health care services by infants born extremely prematurely in the province of Quebec." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116120.
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To compare health care use from neonatal discharge to 18 months corrected age of two groups of extremely preterm children (< 26 vs. 26-29 weeks of gestation), we used a province-wide database containing neonatal and follow-up data on 254 infants (77% of survivors) born at < 29 weeks of gestation and cared for at 3/6 neonatal units in Quebec in 2003-2004. Neonatal data were abstracted from medical records by trained personnel. At 18 months corrected age, neurodevelopmental status was assessed by psychologists and paediatricians. Data on health care use were collected from charts and parent interviews. Descriptive statistics are provided and logistic regression analysis was carried out to evaluate perinatal and social determinants of re-hospitalization and frequent use of health services resources. Results show that 57% of infants born at < 26 weeks (n=49) and 49% of those born at 26-29 weeks (n=205) were re-hospitalized, mostly for respiratory illness. Both groups used a significant amount of health resources: 61% vs. 59%, respectively, received physical or occupational therapy, 29% vs. 17%, respectively, required long-term rehabilitation, 38% vs. 28%, respectively, used prescribed medication, and 59% vs. 33%, respectively, required home medical equipment (home oxygen, apnea monitors, orthopaedic devices and visual aids). Risk of re-hospitalization was associated with severe brain injury, use of an apnea monitor, and older age at neonatal discharge. Multiple birth, severe brain injury, suspected neonatal sepsis, and single-parent household were independently associated with the risk of using health care services above average. These results highlight the importance of resource allocation to preterm infants for medical and rehabilitation services after discharge from the neonatal intensive care unit.
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Houdet, Joël. "Entreprises, biodiversité et services écosystémiques. Quelles interactions et stratégies? Quelles comptabilités?" Phd thesis, AgroParisTech, 2010. http://pastel.archives-ouvertes.fr/pastel-00531612.
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Depuis quelques années, les entreprises subissent des pressions grandissantes pour mitiger leurs impacts sur la biodiversité. Notre thèse a pour objectif de leur proposer de nouveaux cadres conceptuels et outils pour réconcilier économie et écologie. Dans la première partie, nous analysons les comportements stratégiques des firmes par rapport à leurs interactions avec la biodiversité et les services écosystémiques (BSE). Si ces derniers sont souvent perçus comme sources de contraintes, notamment réglementaires, nous soulignons les multiples intérêts pour l'entreprise d'une gestion fine de son interdépendance au monde vivant. Dans la seconde partie, nous nous intéressons aux innovations nécessaires à l'émergence de dynamiques de co-viabilité entre firmes et biodiversité, et, en particulier, à la construction de nouveaux indicateurs. Deux axes de travail complémentaires sont explorés. Via plusieurs études de cas, nous formalisons tout d'abord un cadre de comptabilité analytique pour gérer les interactions de l'entreprise avec les BSE. Ensuite, nous présentons les fondements conceptuels d'une comptabilité visant à rendre compte aux parties prenantes de la performance des entreprises en matière de BSE, vers la normalisation d'un Bilan Biodiversité. Si la généralisation de ce dernier nécessiterait des travaux supplémentaires, soulignons que son institutionnalisation conduirait à produire les systèmes d'informations clefs au basculement des régulations sur les consommations de nature, vers la mobilisation d'outils économiques permettant à la fois de rendre couteuses les dégradations de BSE et de rentabiliser les pratiques qui leurs seraient favorables.
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Chugunova, Galina, and Robert Örneving. "MODELING AND OPTIMIZATION OF CUSTOMER SERVICE SYSTEMS." Thesis, KTH, Matematisk statistik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-275592.
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This project is dedicated to modelling and optimization of a queue system and personnel management in organizations and is designed as a case study of a phone customer service. Customer services have become an important part of the majority of modern business systems thanks to its role as a primary tool for communication between companies and customers. Hence follows great academical and practical interest for splendidly designed customer systems and even for personnel welfare. The latter is an important factor influencing a number of aspects, for example system’s effectiveness, quality of service and personnel turnover. The theory behind queue modelling and simulations can be found in chapter 2, which is followed by data overview. The approach of modeling is described in chapter 4 and includes data processing, estimation of intensities and simulation of similar datasets based on the produced intensities. Simulations are also used to produce working timetables, to show the dependence between target achievements and budget and check the model’s accuracy. The optimal working timetable with different budget targets is presented at the end of the chapter 5. The model’s accuracy and implications of the case study are discussed in chapter 6. Chapter 7 is dedicated to personnel welfare. Firstly, we consider relevant theoretical background such as organization theory and its HR perspective. Overview of personnel welfare system of the customer service modelled in the mathematical part is given in 7.3.1. This part is followed by case study of a company called T-Mobile. After that some aspects of personnel welfare are discussed, and the conclusions are drawn in chapter 8.Detta projekt behandlar modellering och optimering av ett kösystem samt personalvård på organisationer och är utformad som en fallstudie av en telefonkundtjänst. Kundtjänstsystem har blivit en viktig del av de flesta, om inte alla, moderna affärssystem tack vare dess roll som ett primärt kommunikationsinstrument för företag och kunder. Härav följer stort akademiskt och praktiskt intresse för välfungerande kundtjänstsystem och inte minst för personalvården. Det sistnämnda är en viktig faktor som påverkar en rad aspekter såsom kundtjänstsystemets effektivitet, servicekvalitet och personalomsättning. Teorin bakom kömodellering och simulering hittas i kapitel 2, som följs av dataöverblick i nästa kapitel. Tillvägagångssättet vid kömodelleringen beskrivs i kapitel 4 och inkluderar databearbetning, estimering av intensiteter samt simulering av liknande datamängder med de framtagna intensiteterna som utgångspunkter. Simuleringar används dessutom för att ta fram scheman, visa beroendet mellan variabler måluppfyllnad och budget och kontrollera modellens träffsäkerhet. Optimalt arbetsschema för olika budgetmålsättningar ställs upp och presenteras i slutet på kapitel 5. Modellens träffsäkerhet och implikationer av studiens resultat diskuteras i kapitel 6. Kapitel 7 är dedikerad till personalvård. Först vänder vi oss till teoretiska grunder av organisationsteori och dess HR-perspektiv. Översikt på hur personalvård ser ut på en kundtjänstavdelning vars kösystem har modellerats ges i 7.3.1. Den delen följs av fallstudien av ett bolag T-Mobile. Sedan markeras olika moment av personalvård i diskussionsdelen. Slutsatser sammanfattas i kapitel 8.
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Galpin, Ixent. "Quality of service aware optimization of sensor network queries." Thesis, University of Manchester, 2010. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:136326.
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Sensor networks comprise resource-constrained wireless nodes with the capability of gathering information about their surroundings and have recently risen to prominence with the promise of being an effective computing platform for diverse applications, ranging from event detection to environmental monitoring. The database community proposed the use of sensor network query processors (SNQPs) as means to meet data collection requirements using a declarative query language. Declarative queries posed against a sensor network constitute an effective means to repurpose sensor networks and reduce the high software development costs associated with them. The range of sensor network applications is very broad. Such applications have diverse, and often conflicting, QoS expectations in terms of the delivery time of results, the acquisition interval at which data is collected, the total energy consumption of the deployment, or the network lifetime. The conflicting nature of these desiderata is aggravated by the resource-constrained nature of sensor networks as a computing fabric, making it particularly challenging to reconcile the trade-offs that arise. Previously, SNQPs have been focussed on evaluating queries as energy-efficiently as possible. There has been comparatively less work on attempting to meet a broad range of optimization goals and constraints that captured these QoS expectations. In this respect, previous work in SNQP has not aimed at being general purpose across the breadth of applications to which sensor networks have been applied. This PhD dissertation presents an approach for enabling QoS-awareness in SNQPs so that query evaluation plans are generated that exhibit good performance for a broader range of sensor network applications in terms of their QoS expectations. The research contributions reported here include (a) a functional decomposition of the decision-making steps required to compile a declarative query into a query evaluation plan in a sensor network setting; (b) algorithms to implement these decision-making steps; and (c) an empirical evaluation to show the benefits of QoS-awareness compared to a representative fixed-goal SNQP.
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Rodrigues, Joana Filipa Soares Pereira. "Modelos matemáticos para a gestão do serviço de receção no Instituto Português de Reumatologia." Master's thesis, Instituto Superior de Economia e Gestão, 2013. http://hdl.handle.net/10400.5/6550.
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Mestrado em Decisão Económica e EmpresarialO objetivo deste trabalho final de mestrado (TFM) é o estudo de modelos de Investigação Operacional, para resolver um problema sentido nos serviços de receção de utentes do Instituto Português de Reumatologia (IPR). Durante o estágio nesta instituição foi identificada a dificuldade em dar resposta, de forma rápida, ao elevado número de utentes que se concentram na sala de espera em certos períodos de tempo, provocando desequilíbrios na agenda dos médicos e tensão nas salas de espera. Estes utentes têm de aguardar pelo serviço de receção por diferentes razões: dar entrada para consultas, marcar novas consultas ou exames, efetuar pagamentos de exames, receber informações sobre o funcionamento do instituto e ainda concluir processos de internamento. Com o objetivo de obter possíveis soluções para este problema, a metodologia proposta neste relatório foi a construção de dois modelos matemáticos: modelo de programação linear inteira e modelo de simulação. Foram estudadas diversas propostas de reorganização do serviço de receção do instituto, utilizando o modelo de simulação. O modelo de programação linear inteira foi utilizado para resolver instâncias do problema com o objetivo de determinar o número mínimo de balcões necessários para o fluxo esperado de utentes, usando dados recolhidos no IPR e dados da simulação. Com base na análise dos indicadores dos modelos de simulação concluiu-se que a melhor proposta seria a da marcação da próxima consulta pelos médicos. De acordo com as soluções obtidas pelas diversas instâncias do modelo de programação linear inteira, concluiu-se que um dos balcões não está em funcionamento na maioria dos turnos. Foi ainda construído um modelo em Excel que permite aos funcionários decidir, em tempo real, o número de balcões que deverão abrir em cada turno, conhecendo o número e tipo de utentes que estão em fila de espera.
The purpose of this internship report is to study some models of Operational Research, so that the problem that is felt by the users at the reception desk of the Portuguese Institute of Rheumatology (IPR) can be solved. During the internship at this institution the problem that was identified was the difficulty of the reception desk in giving a quick answer to the numerous users that are in the waiting room at certain hours. This causes a certain imbalance in the doctors’ schedules and also some tension in the waiting room. The reasons why the users have to wait at the reception desk are the following: admission to appointments, schedule of new appointments or medical exams, paying for the provided services, getting information about the functioning of the institute and also concluding the hospitalization process. In order to obtain possible solutions to this problem, the proposed methodology for this report was to build two mathematical models: linear integer programming model and simulation model. Several proposals for reorganizing the reception desk service were carried out by using the simulation model. Based on the data gathered from the IPR and from the simulation model, the integer linear programming model was used to solve the problem instances, in order to determine the minimum number of service counters that is necessary to handle the users expected flow. By analyzing the simulation model indicators we came to the conclusion that the best proposal would be the scheduling of the new appointments by the doctors. According to solutions provided by the several instances of the integer linear programming model, we can conclude that one of the service counters of the reception desk doesn’t function in most shifts. Guided by the number and type of users that are queuing, an Excel model was constructed. It allows the employees to decide, in real time, the number of service counters that should be open each shift.
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Gedik, Bugra. "Scaling Continuous Query Services for Future Computing Platforms and Applications." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11452.
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The ever increasing rate of digital information available from on-line sources drives the need for building information monitoring applications to assist users in tracking relevant changes in these sources and accessing information that is of interest to them in a timely manner. Continuous queries (CQs) are standing queries that are continuously evaluated over dynamic sources to track information changes that meet user specified thresholds and notify users of new results in real-time. CQ systems can be considered as powerful middleware for supporting information monitoring applications. A significant challenge in building CQ systems is scalability, caused by the large number of users and queries, and by the large and growing number of information sources with high update rates.
In this thesis we use CQs to shepherd through and address the challenges involved in supporting information monitoring applications in future computing platforms. The focus is on P2P web monitoring in Internet systems, location monitoring in mobile systems, and environmental monitoring in sensor systems. Although different computing platforms require different software architectures for building scalable CQ services, there is a common design philosophy that this thesis advocates for making CQ services scalable and efficient. This can be summarized as "move computation close to the places where the data is produced." A common challenge in scaling CQ systems is the resource-intensive nature of query evaluation, which involves continuously checking updates in a large number of data sources and evaluating trigger conditions of a large number of queries over these updates, consuming both cpu and network bandwidth resources. If some part of the query evaluation can be pushed close to the sources where the data is produced, the resulting early filtering of updates will save both bandwidth and cpu resources.
In summary, in this thesis we show that distributed CQ architectures that are designed to take advantage of the opportunities provided by ubiquitous computing platforms and pervasive networks, while at the same time recognizing and resolving the challenges posed by these platforms, lead to building scalable and effective CQ systems to better support the demanding information monitoring applications of the future.
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Li, Hong Ping. "Secure proximity queries in mobile geo-social services." HKBU Institutional Repository, 2013. https://repository.hkbu.edu.hk/etd_ra/1551.
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Klinger, Myriam. "Identites collectives et exclusions sociales. Quelques fonctions sociales d'une sociologue." Université Marc Bloch (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR20009.
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Identites collectives et exclusions sociales : ces notions prennent sens ensemble, au regard des representations du sujet moderne dans une societe caracterisee par l'individualisme. La recherche se deroule a l'interieur de quelques institutions du travail social, au fil des experiences professionnelles d'une sociologue (hopital psychiatrique, foyer de reinsertion pour adultes, ecoles de formation de travailleurs sociaux). Sa participation a l'action institutionnelle l'amene a presenter quelques fonctions sociales du sociologue en situation d'intervention. Les theories, les modeles d'analyse et d'action qui orientent sa recherche et son agir, sont presentes en premiere partie. En deuxieme partie, l'approche biographique guide une reflexion qui rend compte, a la fois des theories, des histoires de vie sociale et des acteurs sociaux. Crise, violence, repetition et transformation, ponctuent la vie quotidienne des institutions etudiees. Les logiques sociales observees eclairent diversement le projet de communication et d'insertion qui fonde l'exclusion sociale aujourd'hui. La formation des identites collectives interroge la volonte de reconnaitre l'autre dans sa differenceWith regard to a comtemporaneous person represented in a society caracterized by individualism two concepts get a meaning together: collective identities and social exclusions. This study takes place within a few institutions specialized in social work, during a sociologist's professional experiences (asylum, social home for adults, social worker training school). The sociologist's involvement with an institutional action, led her to present some of her social functions while being in a situation of intervention. Part 1 is a presentation of theories, and both analysis and action patterns which orientate the sociologist's research and act. Based on a biographical approach, a discussion on theories, social life stories and social protagonists follows in part 2. Grisis, violence, repetition and changes punctuate the day to day life in the surveyed institutions. Observed social logics variously enlighten the project for communication and insertion. This project is the basis for social exclusion today. The training of collective identities question the will that the other person be recognized with all his differences
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Lind, Isabelle, and Jennifer Öhlin. "Transgenderism and the Social Services : A qualitative study about transgender people and their experiences of the Social Services in Sweden." Thesis, Högskolan i Gävle, Socialt arbete, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-23688.
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The aim of this study was to investigate how transgender people may experience the services that are offered by the Social Services. To fulfill the aim, the researchers decided to focus on the transgender peoples’ perspectives, and therefore chose to interview them and put them in an expert position. In this study a qualitative approach was used, and the data was gathered through two semi-structured face-to-face interviews. The main result was that the participants experienced that the Social Services sometimes might not have the right knowledge to give them proper information, sufficient support and the help they needed. Therefore, the participants often searched for information on their own, and the trust for the Social Services was unsatisfactory. One conclusion that could be drawn from this study was that the Social Services need to increase and improve their level of knowledge within this subject.
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Silver, Richard. "The Right to English health and social services in Quebec : a legal and political analysis." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0015/MQ46796.pdf.
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Sabesan, Manivasakan. "Querying Data Providing Web Services." Doctoral thesis, Uppsala universitet, Avdelningen för datalogi, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-128928.
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Web services are often used for search computing where data is retrieved from servers providing information of different kinds. Such data providing web services return a set of objects for a given set of parameters without any side effects. There is need to enable general and scalable search capabilities of data from data providing web services, which is the topic of this Thesis. The Web Service MEDiator (WSMED) system automatically provides relational views of any data providing web service operations by reading the WSDL documents describing them. These views can be queried with SQL. Without any knowledge of the costs of executing specific web service operations the WSMED query processor automatically and adaptively finds an optimized parallel execution plan calling queried data providing web services. For scalable execution of queries to data providing web services, an algebra operator PAP adaptively parallelizes calls in execution plans to web service operations until no significant performance improvement is measured, based on monitoring the flow from web service operations without any cost knowledge or extensive memory usage. To comply with the Everything as a Service (XaaS) paradigm WSMED itself is implemented as a web service that provides web service operations to query and combine data from data providing web services. A web based demonstration of the WSMED web service provides general SQL queries to any data providing web service operations from a browser. WSMED assumes that all queried data sources are available as web services. To make any data providing system into a data providing web service WSMED includes a subsystem, the web service generator, which generates and deploys the web service operations to access a data source. The WSMED web service itself is generated by the web service generator.eSSENCE
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Giuliani, Frédérique Ion Jacques. "L'ordre pactisé des dispositifs d'accompagnement ethnographie de la relation d'aide sur quelques scènes actuelles du travail social /." Lyon : Université Lumière Lyon 2, 2005. http://theses.univ-lyon2.fr/sdx/theses/lyon2/2005/giuliani_f.
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Grade, Nuno Daniel Gouveia de Sousa. "Data queries over heterogeneous sources." Master's thesis, Faculdade de Ciências e Tecnologia, 2013. http://hdl.handle.net/10362/10053.
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Dissertação para obtenção do Grau de Mestre em
Engenharia InformáticaEnterprises typically have their data spread over many software systems, such as custom made applications, CRM systems like SalesForce, CMS systems, or ERP systems like SAP. In these setting, it is often desired to integrate information from many data sources to accomplish some business goal in an application. Data may be stored locally or in the cloud in a wide variety of ways, demanding for explicit transformation processes to be defined, reason why it is hard for developers to integrate it. Moreover, the amount of external data can be large and the difference of efficiency between a smart and a naive way of retrieving and filtering data from different locations can be great. Hence, it is clear that developers would benefit greatly from language abstractions to help them build queries over heterogeneous data sources and from an optimization process that avoids large and unnecessary data transfers during the execution of queries. This project was developed at OutSystems and aims at extending a real product, which makes it even more challenging. We followed a generic approach that can be implemented in any framework, not only focused on the product of OutSystems.
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Sombie, Issiaka. "Amélioration de l'utilisation des services de santé maternelle au Burkina Faso: Quelles stratégies adopter ?" Doctoral thesis, Universite Libre de Bruxelles, 2007. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210671.
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IntroductionLa mortalité maternelle reste encore élevée dans les pays en développement notamment en Afrique où une femme parmi 16 en âge de reproduction sera touchée par cette mortalité contre 1 femme parmi 2400 dans les pays développés. Au Burkina Faso, ce risque de mortalité est de 1 parmi 12 pour une femme en âge de reproduction.
La littérature internationale montre qu’un meilleur accès aux soins qualifiés à l’accouchement et aux soins obstétricaux d’urgence est la solution majeure pour sauver la vie d’une femme au cours de la grossesse, de l’accouchement et dans le post partum. Elle montre que cet accès est limité en milieu rural par l’existence de barrières liées aux services de santé, de barrières économiques et sociales. Au milieu des années 1990, il a été montré qu’il serait possible d’améliorer l’accès des femmes aux soins qualifiés et aux soins d’urgence par des interventions locales visant à réduire ces barrières. Ces résultats ont entraîné la mise en place de plusieurs interventions en milieu rural burkinabè. L’objectif de cette thèse est d’examiner les activités mises en place au niveau du système de santé dans les districts ruraux de Houndé et d’Orodara au Burkina Faso afin de mieux comprendre ce qui a été à la base de l’évolution des indicateurs de santé maternelle.
Méthodologie
Le travail a combiné des méthodes quantitatives et qualitatives. Des études de cas, plusieurs sources d’informations (revue des documents, interview des populations, prise de notes, observation participante) ont été utilisées pour identifier au niveau du système de santé des districts les activités pouvant influencer l’utilisation des soins obstétricaux d’urgence et analyser la dynamique et la qualité de leur mise en œuvre. Des approches quantitatives (étude écologique, analyse transversale, étude avant et après) ont permis d’étudier l’évolution des indicateurs et de mettre celles-ci en parallèle avec la réalisation de certaines activités. Enfin, les résultats dans les deux districts ont été comparés avec ceux d’autres districts ayant aussi bénéficié d’une intervention en santé maternelle.
Résultats
L’analyse du système de santé a identifié l’existence d’activités d’éducation et de mobilisation des populations, d’amélioration de l’environnement de la prise en charge de la femme enceinte et de renforcement de compétence des agents de santé et des accoucheuses villageoises dans les deux districts. Dans le district de Houndé une intervention bien structurée (le projet SAREDO) avec analyse des besoins a été à la base d’une grande partie des activités de 2000 à 2003. Mais l’analyse de la mise en oeuvre des activités de ce projet a montré des écarts par rapport à ce qui avait été planifié, des retards et un manque de suivi des activités. Ces faiblesses du projet étaient liées à l’approche participative de mise en œuvre, à des faiblesses organisationnelles et à l’arrêt avant terme du financement. Dans le district d’Orodara, la mise en place des activités a démarré avec l’arrivée en 2001 d’un médecin chef en provenance du district de Houndé. Aucune intervention planifiée n’a existé. Les activités ont été mises en place à partir de décisions empiriques s’inspirant de l’expérience du projet SAREDO à Houndé. Dans les deux districts, la collaboration avec des intervenants dans et hors du district, le leadership de l’équipe de district et l’utilisation rationnelle des ressources ont été déterminants dans la mise en œuvre des activités.
L’évolution des indicateurs de soins maternels a montré une amélioration de l’utilisation des soins maternels en général de 1999 à 2006 dans les deux districts. En 2004, si l’utilisation des services de consultation prénatale et de maternité pour l’accouchement était meilleure à Houndé qu’à Orodara, il n’existait aucune différence pour ce qui était du taux des accouchements par césarienne. Pour ce dernier indicateur, on notait une croissance linéaire dans le district de Houndé, tandis qu’à Orodara, le taux était resté stable de 1999 à 2002 et à partir de 2003 on assistait à une amélioration avec un taux atteignant celui de Houndé en 2005. La mise en parallèle de l’évolution du taux d’accouchements par césarienne et du calendrier des activités dans les deux districts montre une amélioration après la mise en place du renforcement de la qualité des soins (formation des agents et équipement) et de la réduction du coût des soins d’urgence surtout dans le district d’Orodara. Ces observations suggèrent l’existence d’une relation entre l’évolution du taux des accouchements par césarienne et, d’une part, le renforcement de la qualité des soins et d’autre part, la mise en place de la réduction du coût des soins d’urgence.
Une évaluation a relevé dans le district de Houndé que l’offre de soins était meilleure après la formation des agents de santé et l’équipement des services. Elle a aussi montré une meilleure utilisation des services de base (consultation prénatale et accouchements institutionnels) et un taux plus élevé d’évacuations obstétricales dans le groupe des centres de santé avec un responsable de la maternité ayant bénéficié de la formation que dans le groupe des centres de santé avec un agent non formé responsable de la maternité. Les proportions d’accouchements par césarienne et d’interventions obstétricales majeures réalisées pour sauver la vie de la mère étaient plus élevées dans le groupe des centres de santé avec un agent formé responsable de la maternité mais les différences n’étaient pas statistiquement significatives. Les résultats de cette évaluation montrent qu’au niveau des centres de santé de base, former les agents et équiper les services permettent d’améliorer la qualité et l’utilisation des services de base mais ne suffisent pas pour améliorer l’utilisation des soins obstétricaux d’urgence.
Au niveau de l’hôpital du district d’Orodara, après la mise en place des kits opératoires, les proportions des évacuations obstétricales à l’admission, des évacuations obstétricales prises en charge et des accouchements par césarienne à l’hôpital du district se sont améliorés significativement tandis que les proportions des complications infectieuses post césarienne et des évacuations obstétricales à l’hôpital de référence, et le coût des soins d’urgence ont été réduits. Ceci montre qu’en réduisant le coût des soins via les kits opératoires et en plus d’une formation des agents de santé, on a pu améliorer l’accès et la qualité des soins obstétricaux d’urgence dans cet hôpital.
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Doctorat en Sciences de la santé publique
info:eu-repo/semantics/nonPublished
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Challita, Claude. "Quelles valorisations de produits agro-alimentaires typiques libananais ?" AgroParisTech, 2010. http://www.theses.fr/2010AGPT0006.
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Jin, Yifan, and 金一帆. "A filter-based protocol for continuous queries over imprecise locationdata." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B49617953.
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In typical location-based services (LBS), moving objects (e.g., GPS-enabled mobile phones) report their locations through a wireless network. An LBS server can use the location information to answer various types of continuous queries, e.g., \Give me the ID of a battalion which is the closest to a military base within the next hour." Due to hardware limitations, location data reported by the moving objects are often uncertain. In this paper, we study efficient methods for the execution of Continuous Possible Nearest Neighbor Query (CPoNNQ) that accesses imprecise location data. A CPoNNQ is a standing query (which is active during a period of time) such that, at any time point, all moving objects that have non-zero probabilities of being the nearest neighbor of a given query point are reported. To handle the continuous nature of a CPoNNQ, a simple solution is to require moving objects to continuously report their locations to the LBS server, which evaluates the query at every time step. To save communication bandwidth and mobile devices' batteries, we develop two filter-based protocols for CPoNNQ evaluation. Our protocols install filter bounds" on moving objects, which suppress unnecessary location reporting and communication between the server and the moving objects. Through extensive experiments, we show that our protocols can effectively reduce communication and energy costs while maintaining a high query quality.published_or_final_version
Computer Science
Master
Master of Philosophy
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Cruz, Alexandre Azevedo Da Orfeuil Jean-Pierre. "Les expériences de services en Europe quelles conditions pour leur pérennité ? /." Créteil : Université de Paris-Val-de-Marne, 2005. http://doxa.scd.univ-paris12.fr:80/theses/th0231211.pdf.
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Cruz, Alexandre Azevedo Da. "Les expériences de services en Europe : quelles conditions pour leur pérennité ?" Paris 12, 2005. https://athena.u-pec.fr/primo-explore/search?query=any,exact,990002312110204611&vid=upec.
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Ce travail présente des propositions dans divers domaines, ayant pour but de créer un modèle d'organisation des SM (Services à la mobilité) susceptible de leur assurer la pérennité, afin d'éviter leur dépendance envers des interventions publiques. Ces propositions sont issues de l'analyse et évaluation profonde de divers cas d'étude en Europe, au Japon et aux Etats-Unis, parmi lesquels quatorze ont été traités en profondeur représentant des cas de succès, des échecs et des demi-échecs. Aussi nous avons analysé l'évolution des offres de TC, de modes soutenables et de SM depuis quatre décennies, ainsi que les conditions qui ont permis l'émergence des SM en Europe. En parallèle de ces propositions pour l'organisation des SM, nous proposons aussi des critères pour le suivi et l'évaluation des SM. Nous avons utilisé ces propositions pour construire un modèle d'organisation des SM, ainsi et de leur financement soutenable, pour la région Ile-de-FranceThis work presents a set of proposals in different domains, with the finality to create an organization model for SM (Mobility services) than can ensure them perennity, in order to prevent their dependance from public intervention. These proposals are a result of the in depth analysis and evaluation of a diversity of study cases in Europe, Japan, and United-States. Among these case studies fourteenth have been studied with special attention. They represent success, failure or mixed result cases. We have also analyzed the evolution of Public Transports, sustainable modes and SM in the last four decades, so as the conditions that allowed the development of SM in Europe. Finally, and in parallel to the proposals to construct an organization model for SM, we also propose some criteria to follow-up and evaluate SM. We used the diverse proposals in order to built an organization model for SM in the Ile-de-France region, as well as a sustainable financing plan for SM in this region
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SEAH, KHOON GUAN. "Analysis of a Single-Server Priority Queue with Vacations and Service-Dependent Switchover Times and its Applications." Kyoto University, 1997. http://hdl.handle.net/2433/202315.
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Kyoto University (京都大学)0048
新制・課程博士
博士(工学)
甲第6875号
工博第1626号
新制||工||1069(附属図書館)
15962
UT51-97-H259
京都大学大学院工学研究科応用システム科学専攻
(主査)教授 長谷川 利治, 教授 茨木 俊秀, 教授 金澤 正憲
学位規則第4条第1項該当
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Toumi, Iqbal. "Les services publics au Maroc : quelles perspectives de développement et de financement ?" Perpignan, 2006. http://www.theses.fr/2006PERP0733.
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Au Maroc, le service public en tant que concept et les services publics en tant qu’organisations et structures sont interpellés tant au niveau de la doctrine, de la conception et des modes de production et de financement, qu’au niveau de l’économie et de la société en général ; ils connaissent, à l’évidence, une crise de fonctionnement, de perspectives de développement et de financement. Au regard des données économiques et des résultats de diagnostics sectoriels exhaustifs menés, et tout en étant conscient que la vérité est contingente, nous développons une conception pragmatique du service public qui permet de répondre aux besoins de financement actuels et futurs du Maroc et qui refonde en même temps la légitimité des activités économiques de service public tout en les articulant avec les règles et principes de démocratie participative. Ainsi, et au-delà des choix et conceptions dogmatiques et doctrinaires, et tout en récusant la transposition sans discernement d’outils ou de techniques en provenance d’autres environnements, nous soutenons que le partenariat public-privé est la pierre angulaire autour de laquelle nous pouvons ériger un instrumentum global, économique et institutionnel, de renouveau de conception de service public et des modes de production et de financement alternatifs pour le Maroc. La mise en œuvre réussie des mécanismes de partenariat public/privé exige des mesures d’accompagnement nécessaires en termes :- d’encadrement institutionnel et légal formalisé ;- de structures institutionnelles de régulation économique ;- et d’un système de représentation des usagers institutionnaliséIn Morocco, the public service as a concept and public services as organisations and structures are being questioned, not only at the level of doctrine, conception and production and financing methods, but also at the level of economy and society in general; it is obvious that they are going through a crisis in terms of functioning and development and financing perspectives. In view of economic data and the results of highly detailed sectoral diagnostics carried out, and bearing in mind that the reality is contingent and relative, we can adopt a pragmatic approach of the public service which will answer the present and future financial needs of Morocco and at the same time reform the legitimacy of public service economic activities whilst combining them with the rules and principles of a participative democracy. Therefore, beyond dogmatic and doctrinarian choices and approaches, we put forward the idea, whilst at the same time asserting that tools and techniques taken from other environments should not be transposed before being given due consideration, that the partnership between the public and private sectors is the cornerstone upon which we can erect a global, economic and institutional instrument to boost the idea of public services and methods of production and alternative financing for Morocco. A successful implementation of a public/private partnership mechanism can only come about if accompanied by necessary measures in terms of : an institutional and legal framework on a national scale ; institutional structures guaranteeing economic regulation ; and an institutionalised user representation system
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Ambrosini, Daniele Lamberto. "Professional perceptions of psychiatric advance directives : a view of multiple stakeholders in Ontario and Québec." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112377.
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Psychiatric advance directives (PADs) are legal documents allowing competent individuals to declare their treatment preferences in advance of a mental health crisis. The objective of this thesis is to examine psychosocial perceptions of legal and mental health professionals in Ontario and Quebec regarding their knowledge and willingness to implement PADs. Two hundred professionals---psychiatrists, psychologists, lawyers and administrative tribunal members---participated in an Web-survey measuring psychosocial perceptions of clinical, ethical, legal and implementation factors of PADs. Results indicate Quebec professionals are more willing to begin using PADs than Ontario professionals. Mental health professionals reported more concern than legal professionals for medical malpractice lawsuits for overriding PADs. Advantages of PADs most commonly reported are patients' ability to declare their clear wishes ahead of time, respect for autonomous choice, and establishing a collaborative treatment plan with physicians. Disadvantages included patients' lack of awareness, treatment refusal, and being self-bound to an earlier decision.
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GUEDES, Bruno Nunes. "Analysis of extended warranties for medical equipment: a game theory based approach using priority queues." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/17627.
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CNPq
A growing trend in hiring maintenance services has been observed in companies in general in order to enhance competition and reduce costs. This practice becomes even more evident in the context of health institutions, as they strongly employ technology-intensive equipment that must follow tight quality standards that intend to ensure the continuity of the service and the safety of patients. These characteristics contribute in allowing the maintenance to be executed by the Original Equipment Manufacturer (OEM), since several pre-established procedures must be attended during maintenance. Thus, it becomes relevant to analyze the interaction among customers (hospitals) and the equipment manufacturer in this particular maintenance services market. In the developed model the customers are divided into 2 classes, great size hospitals belong to class 1 and small hospitals belong to class 2 and class 1 customers have priority over class 2 customers. Class 1 customers have the option of hiring an Extended Warranty (EW) with priority or of paying for each maintenance intervention on demand, while class 2 customers have the option of hiring an standard EW (with no priority) or of paying for each maintenance intervention on demand. To model such dynamics a 2-class priority queuing system is implemented. The customers select the option that maximize their expected utilities, as they are risk averse, while the manufacturer needs to set the EW and maintenance intervention prices and select the optimal number of customers of each class to service in order to maximize their expected profit. A Stackelberg Game is used to model the interaction among players, in which the OEM is the leader and the customer is the follower. In the numerical example it has been found that the customers of class 1 decide to hire EW with priority, while class 2 customers decide to pay for maintenance services on demand. Also the OEM decides to service 3 customers of class 1 and 100 customers of class 2, which yields an expected profit of $ 3,204,450. A sensitivity analysis is also performed to analyze how the optimal solution changes due to parameters variations.
Uma tendência crescente para a contratação de serviços de manutenção tem sido observada em empresas em geral com o objetivo de aumentar sua competitividade e reduzir custos. Tal prática se torna ainda mais evidente no contexto de instituições de saúde, já que elas utilizam diversos equipamentos intensivos em tecnologia que precisam se adequar a rígidos padrões de qualidade de forma a garantir a continuidade do serviço e a segurança dos pacientes. Essas características contribuem para que os serviços de manutenção sejam executados pelo fabricante do equipamento, já que diversos procedimentos específicos precisam ser seguidos durante a manutenção. Assim, torna-se relevante analisar a interação entre clientes (hospitais) e o fabricante do equipamento neste mercado particular. No modelo desenvolvido, os clientes foram divididos em 2 classes, hospitais de grande porte pertencem à classe 1 e hospitais pequenos pertencem à classe 2 e os clientes da classe 1 têm prioridade em relação aos clientes da classe 2. Os clientes da classe 1 têm a opção de contratar uma garantia estendida com prioridade ou de pagar por cada intervenção de manutenção sob demanda, já os clientes da classe 2 têm a opção de contratar uma garantia estendida padrão (sem prioridade) ou de pagar por cada intervenção de manutenção sob demanda. Para modelar esta dinâmica um sistema de filas com 2 classes de prioridade foi implementado. Os clientes escolhem a opção que maximiza suas utilidades esperadas, já que são avessos ao risco, enquanto o fabricante deve determinar os preços das garantias estendidas e das intervenções avulsas além do número ótimo de clientes que ele deve atender de forma a maximizar o seu lucro esperado. Para modelar a interação entre os jogadores foi utilizado um Jogo de Stackelberg em que o fabricante é o líder e o cliente, o seguidor. O exemplo numérico apresentado mostra que a decisão ótima para os clientes da classe 1 é adquirir a garantia estendida com prioridade, enquanto para os clientes da classe 2 a decisão-ótima é pagar pelos serviços de manutenção sob demanda. O fabricante decide atender 3 clientes da classe 1 e 100 clientes da classe 2, o que lhe gera um lucro de $ 3,204,450. Uma análise de sensibilidade é apresentada em seguida para investigar como a solução ótima muda em decorrência de variações nos parâmetros.
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Thomas, Rosemary Hellen. "Access to health care services : East-End Montreal (Quebec) English-speaking elderly experience." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=111557.
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To better understand Anglophone elderly experience in accessing health care services in a Francophone area, it is important to look beyond availability of healthcare services near their homes. This study explored factors such as language competence, preference, motivation, reaching and waiting times, as contributors to elderly people's choice.A questionnaire designed for this study was administered to 199 males and females, aged 55 years and older, recruited from the only Anglophone Seniors' Centre in East-End Montreal. It was found that elderly people with limited French proficiency were more likely to travel out of their area for healthcare services, resulting in significantly longer average travel and waiting times. Of those who would have liked an interpreter, very few were actually able to get one. The most frequently expressed need was for more English or bilingual workers and services.
To improve access and enhance elderly people's quality of life, training and intervention programs need to be developed in collaboration with the government.
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McLean, Mark Edward. "The incidence of Guillain-Barre syndrome in Ontario and Quebec, 1983-1989, using hospital-service databases." Thesis, University of Ottawa (Canada), 1992. http://hdl.handle.net/10393/7478.
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Background. Guillain-Barre syndrome (GBS) is of public health interest in Canada, as well as the rest of North America, for two main reasons. It is occasionally a vaccine-associated adverse event and is also a differential diagnosis of poliomyelitis. Objectives. (1) To ascertain the incidence of GBS in the Canadian provinces of Ontario and Quebec for the years 1983-1989, inclusive. (2) To demonstrate the feasibility of measuring the incidence of GBS through internal record linkage of Canadian hospital-service data. Results. 1,302 and 1,031 records representing GBS incident admissions in Ontario and Quebec, respectively, were identified through the record-linkage procedure. The mean annual GBS incidence after age-and-sex-standardization to the 1986 Canadian census population was 2.02 per 100,000 person-years in Ontario and 2.30 in Quebec. The incidence was higher in older age-strata in both provinces (70-80 years), and was higher in males (M:F = 1.1). Reviews of charts of incident admissions of GBS cases reveal that 26.2%-32.6% of Ontario cases and 21.0%-24.0% of Quebec cases may be false positive diagnoses. No possible false negative cases were identified through chart review. Cross linkage of records belonging to the other province with records from the other dataset revealed 0.5% false negative misclassification of Ontario incident admissions and 1.8% for Quebec. Mortality figures obtained from CMDB were in both provinces less than those obtained in the hospital service data, indicating that it is unlikely a significant number of GBS cases die before reaching hospital. Conclusions. (1) It is possible to internally link records in the HMRI and Med-Echo databases into personal histories (cases) of a condition. (2) The high percentage of false positive misclassifications discovered on examination of incident admissions raises concern about the validity of HMRI and Med-Echo data for epidemiological purposes. (Abstract shortened by UMI.)
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Diego, Maza William David. "Contrôle de trafic et gestion de la qualité de service basée sur les mécanismes IP pour les réseaux LTE." Thesis, Télécom Bretagne, 2016. http://www.theses.fr/2016TELB0406/document.
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Depuis quelques années le trafic de l'internet mobile ne cesse d'augmenter. Cette croissance soutenue est liée à plusieurs facteurs, parmi lesquels l'évolution des terminaux, la grande diversité des services et des applications disponibles et le déploiement des nouvelles technologies d'accès radio mobile (3G/4G). À cet égard, le standard 3GPP pour les réseaux LTE propose une architecture offrant une gestion fine de la QoS (par flux). Ce modèle, hérité des réseaux mobiles traditionnels orientés connexion, soulève des problèmes en termes de scalabilité, efficacité et performances. Les travaux entrepris dans cette thèse ont pour objectif principal de proposer des solutions plus simples et moins coûteuses pour la gestion de la QoS dans les réseaux mobiles. À cette fin, à l'issue d'une étude et de l'évaluation de l'impact de la signalisation associée au modèle de QoS standard, deux modèles alternatifs ont été proposés. Nous proposons tout d'abord un modèle basée sur les mécanismes IP inspiré de l'approche DiffServ (par agrégat) largement étudié dans les réseaux IP fixes. Ce modèle fournit une gestion de la QoS simple, efficiente et rentable, tout en garantissant des performances équivalentes au modèle standard. Cependant, elle nécessite une remise à niveau de tous les eNB, et donc une longue phase de transition. En conséquence, nous proposons SloMo qui vise à améliorer l'expérience des clients mobiles, mais avec un objectif de déploiement plus rapide. SloMo est une solution de gestion implicite de la QoS depuis un point unique situé sur le chemin des communications. SloMo exploite la dynamique instaurée par le mécanisme de contrôle de flux de TCP. Il vise à recréer un goulot d'étranglement dynamique dans un équipement contrôlé par l'opérateur lorsque les points de congestion réels ne sont pas accessibles. Une fois ce goulot d'étranglement déporté, il est alors aisé d'effectuer une gestion de la qualité IP classique dans l'équipement supportant Slo-MoThe mobile data landscape is changing rapidly and mobile operators are today facing the daunting challenge of providing cheap and valuable services to ever more demanding customers. As a consequence, cost reduction is actively sought by operators as well as Quality of Service (QoS) preservation. Current 3GPP standards for LTE/EPC networks offer a fine tuning QoS (per-flow level), which inherits many characteristics of legacy telco networks. In spite of its good performance, such a QoS model reveals costly and cumbersome and finally, it remains very rarely deployed, thereby giving way to basic best-effort hegemony. This thesis aims at improving QoS in mobile networks through cost-effective solutions; To this end, after an evaluation of the impact and cost of signaling associated with the standard QoS model, alternative schemes are proposed, such as the IP-centric QoS model (per aggregate) inspired from the DiffServ approach widely used in fixed IP networks. This model provides a simple, efficient and cost-effective IP level QoS management with a performance level similar to standardized solutions. However, as it requires enhancements in the eNB, this scheme cannot be expected in mobile networks before a rather long time.Thus, we introduce Slo-Mo, which is a lightweight implicit mechanism for managing QoS from a distant point when the congestion point (e.g. eNB) is not able to do it. Slo-Mo creates a self-adaptive bottleneck which adjusts dynamically to the available resources taking advantage of TCP native flow control. Straightforward QoS management at IP level is then performed in the Slo-Mo node, leading to enhanced customer experience at a marginal cost and short term
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Dunkley-Hickin, Catherine. "Effects of primary care reform in Quebec on access to primary health care services." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=123121.
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Primary health care reform has become an area of priority in health policy with a strong importance placed on interdisciplinary teams of health care professionals. Quebec's model, the groupes de médicine de famille (GMFs), were introduced late in 2002 emphasizing team-centered approaches to service delivery and aiming to improve access to primary health care, especially to improve after-hours access and to increase the number of Quebecers with a family doctor.A decade after their implementation, I investigated the impact of GMFs on various measures of access to primary health care and perceived remaining barriers. I emphasize potential access – i.e. measures that capture whether an individual has the ability to access needed health care including having a regular medical doctor.I used data from seven waves of the Canadian Community Health Survey to capture reported access to primary care and barriers to access. GMFs emerged at different rates in different health regions across Quebec allowing the construction of a GMF 'participation' measure using the share of primary care physicians practicing in GMFs in each health region and year. I employed a modified difference-in-difference analysis design that uses multivariate regression analysis to control for time trends in the outcomes, time-invariant differences between regions and individual-level covariates in an attempt to estimate the causal impact of GMF implementation on access to primary health care.I verified that pre-policy differences in terms of population and socioeconomic characteristics between regions with ultimately high vs. low rates of GMF participation are reasonable and remain fixed over time, making comparisons of these regions appropriate. Results suggest that rates of reported access have increased over time in most Quebec health regions. However, these measures of access vary across regions and some always report lower rates of access. Controlling for time trends, fixed differences between regions, and individual characteristics, reported access does not change significantly as GMF participation increases. Improved access to primary health care was one of the principal objectives of Quebec's primary care reform a decade ago. My findings suggest that increased GMF participation has not improved several important measures of access, and that additional policy measures may be necessary to increase potential access to primary health care.La réforme des soins de santé de première ligne occupe une place prioritaire parmi les réformes de santé, notamment avec une grande importance accordée à des équipes interdisciplinaires de professionnels de santé. Le modèle choisi par Québec, les groupes de médecine de famille (GMFs), a été mis en place à la fin de 2002. Ce modèle met l'emphase sur des équipes interprofessionnelles et vise à augmenter le nombre de Québécois avec un médecin de famille, ainsi qu'à offrir une plus grande accessibilité des services de la première ligne, notamment hors les heures normales de travail. Une décennie après leur implantation, j'ai étudié l'impact des GMFs sur diverses mesures d'accès aux soins de santé de première ligne. Je mets l'emphase sur l'accès potentiel – c'est-à-dire les mesures permettant de déterminer si un individu a la possibilité d'accéder aux soins de santé nécessaires, y compris d'avoir un médecin régulier.J'ai utilisé des données de sept cycles de l'Étude sur la santé dans les collectivités canadiennes pour capturer l'accès déclaré aux soins de première ligne et obstacles à cet accès. Il existe une variation régionale dans l'implantation des GMFs à travers les différentes régions sociosanitaires du Québec, ce qui me permet de construire une mesure de participation aux GMFs constituée de la proportion des médecins de première ligne pratiquant en GMF par région sociosanitaire et par année. J'ai employé une analyse qui consiste de modèles de différence-dans-les-différences modifiées qui utilise une analyse de régression multivariée pour contrôler les tendances temporelles, les différences constantes entre les régions, et les covariables au niveau individuel, le but étant d'estimer l'effet causal de la mise en œuvre des GMFs sur l'accès aux soins de santé de première ligne.J'ai vérifié que les différences de caractéristiques populationnelles et socio-économiques dans la période pré-politique entre les régions ayant un taux élevé par rapport à celles ayant un faible taux de participation aux GMFs sont raisonnables et fixes au cours des années de mon étude, rendant ainsi toute comparaison de ces régions appropriées. Les résultats suggèrent que les taux d'accès déclarés ont augmenté au fil du temps dans la plupart des régions sociosanitaires du Québec. Toutefois, ces mesures d'accès varient selon les régions et certains signalent toujours des taux inférieurs d'accès. Contrôlant pour les tendances temporelles, les différences fixes entre les régions, et les caractéristiques individuelles, l'accès déclaré ne change pas de manière significative avec l'augmentation de la participation aux GMFs.Un meilleur accès aux soins de santé de première ligne constituait l'un des principaux objectifs explicites de la réforme des soins de santé de première ligne de 2002. Mes résultats suggèrent que l'augmentation de la participation aux GMFs n'a pas amélioré plusieurs mesures importantes d'accès. En conséquence, des politiques supplémentaires pourraient être nécessaires pour accroître l'accès potentiel aux soins de santé de première ligne.
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Li, Yafei. "Efficient group queries in location-based social networks." HKBU Institutional Repository, 2015. https://repository.hkbu.edu.hk/etd_oa/203.
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Nowadays, with the rapid development of GPS-equipped mobile devices, location-based social networks have been emerging to bridge the gap between the physical world and online social networking services. Various types of data, such as personal locations, check-ins, microblogs and social relations, have been available in location-based social networks. Efficiently managing and analyzing such data to meet users' daily query requirements become a challenging task. Among all the existing works in location-based social networks, group query is one of the most important research topics. In this thesis, we investigate query techniques for location-based services in social networking applications. Specifically, considering a location-based social network, we study spatial-aware interest group queries, geo-social {dollar}k{dollar}-cover group queries, and social-aware ridesharing group queries. Firstly, we study the spatial-aware interest group queries in location-based social networks. Recently, most of the location-based social networks release check-in services that allow users to share their visiting locations with their friends. These locations, considered as spatial objects, are usually associated with a few tags that describe the features of those locations. Utilizing such information, we propose a new type of \emph{Spatial-aware Interest Group} (SIG) query that retrieves a user group of size {dollar}k{dollar} where each user is interested in the query keywords and the users are close to each other in the Euclidean space. We prove this query problem is NP-complete, and develop two efficient algorithms IOAIR and DOAIR based on the IR-tree for the processing of SIG queries. We also validate the performance efficiency of the proposed query processing algorithms by empirical evaluation. Secondly, we study the problem of geo-social {dollar}k{dollar}-cover group queries for collaborative spatial computing. In this problem, we propose a novel type of geo-social queries, called \emph{Geo-Social K-Cover Group} (GSKCG) query, which is based on spatial containment and a new modeling of social relationships. Intuitively, given a set of spatial query points and an underlying social network, a GSKCG query finds a minimum user group in which the members satisfy certain social relationship and their associated regions can jointly cover all the query points. Albeit its practical usefulness, the GSKCG query problem is NP-complete. We consequently explore a set of effective pruning strategies to derive an efficient algorithm for finding the optimal solution. Moreover, we design a novel index structure tailored to our problem to further accelerate query processing. Extensive experiments demonstrate that our algorithm achieves desirable performance on real-life datasets. Thirdly, we study the problem of social-aware ridesharing group queries. With the deep penetration of smartphones and geo-locating devices, ridesharing is envisioned as a promising solution to transportation-related problems such as congestion and air pollution for metropolitan cities. Despite the potential to provide significant societal and environmental benefits, ridesharing has not so far been as popular as expected. Notable barriers include the social discomfort and safety concerns when traveling with strangers. To overcome these barriers, in this thesis, we propose a new type of \emph{Social-aware Ridesharing Group} (SaRG) query which retrieves a group of riders by taking into account their social connections besides traditional spatial proximities. Because the SaRG query problem is NP-hard, we design an efficient algorithm with a set of powerful pruning techniques to tackle this problem. We also present several incremental strategies to accelerate the search speed by reducing the repeated computations. Moreover, we propose a novel index tailored to the proposed problem to further speed up the query processing. Experimental results on real datasets show that our proposed algorithms achieve desirable performance. The works of this thesis show that the group query processing techniques are effective, which would facilitate the wider deployment of such query services in real applications
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Al, Asswad Mohammad Mourhaf. "Semantic information systems engineering : a query-based approach for semi-automatic annotation of web services." Thesis, Brunel University, 2011. http://bura.brunel.ac.uk/handle/2438/5441.
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There has been an increasing interest in Semantic Web services (SWS) as a proposed solution to facilitate automatic discovery, composition and deployment of existing syntactic Web services. Successful implementation and wider adoption of SWS by research and industry are, however, profoundly based on the existence of effective and easy to use methods for service semantic description. Unfortunately, Web service semantic annotation is currently performed by manual means. Manual annotation is a difficult, error-prone and time-consuming task and few approaches exist aiming to semi-automate that task. Existing approaches are difficult to use since they require ontology building. Moreover, these approaches employ ineffective matching methods and suffer from the Low Percentage Problem. The latter problem happens when a small number of service elements - in comparison to the total number of elements – are annotated in a given service. This research addresses the Web services annotation problem by developing a semi-automatic annotation approach that allows SWS developers to effectively and easily annotate their syntactic services. The proposed approach does not require application ontologies to model service semantics. Instead, a standard query template is used: This template is filled with data and semantics extracted from WSDL files in order to produce query instances. The input of the annotation approach is the WSDL file of a candidate service and a set of ontologies. The output is an annotated WSDL file. The proposed approach is composed of five phases: (1) Concept extraction; (2) concept filtering and query filling; (3) query execution; (4) results assessment; and (5) SAWSDL annotation. The query execution engine makes use of name-based and structural matching techniques. The name-based matching is carried out by CN-Match which is a novel matching method and tool that is developed and evaluated in this research. The proposed annotation approach is evaluated using a set of existing Web services and ontologies. Precision (P), Recall (R), F-Measure (F) and Percentage of annotated elements are used as evaluation metrics. The evaluation reveals that the proposed approach is effective since - in relation to manual results - accurate and almost complete annotation results are obtained. In addition, high percentage of annotated elements is achieved using the proposed approach because it makes use of effective ontology extension mechanisms.
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Kim, Eun C. "Blended worship services an effective tool of reconciliation between the Korean and English congregations in Joy Korean-American Church /." Online full text .pdf document, available to Fuller patrons only, 2001. http://www.tren.com.
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Bogalho, Tânia Cristiana Martins. "Aplicação móvel para o sistema de gestão de filas Q.track." Master's thesis, Universidade de Évora, 2021. http://hdl.handle.net/10174/29037.
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Hoje em dia os smartphones provocam grandes alterações na vida das pessoas. Cada vez mais
queremos ser mais produtivos e não desperdiçar tempo no dia-a-dia. Pode-se dizer até que cada vez
mais somos mais dependentes dos telemóveis para qualquer atividade diária.
Neste sentido, inicialmente fez-se um estudo sobre a teoria das filas de espera e sobre os diversos
modelos existentes. Foi feito um estudo do que são os sistemas de gestão de filas e que exemplos
existem atualmente, comparando-os e verificando as lacunas existentes entre eles.
Deste modo, o principal objetivo deste estudo é desenvolver uma aplicação para smartphone que é
um complemento a um sistema de gestão de filas que tinha esta lacuna, relativamente a outros
sistemas de gestão de filas existentes, e que servirá essencialmente, para o utilizador ter acesso ao
estado de atendimento dos serviços de uma determinada entidade ou até retirar uma senha para um
serviço. A sua caracterização foi feita recorrendo a dados de teste, tendo em conta a hora de chegada
a um determinado serviço, a hora de atendimento da senha e a duração do atendimento. Para a
realização deste trabalho, recorreu-se a uma base de dados relacional já com dados reais de senhas
retiradas e atendimentos efetuados; Abstract:
Mobile Application for the Q.track Queue Management System
Nowadays smartphones cause major changes in people's lives. More and more we want to be more
productive and not waste time on a daily basis. It can even be said that we are increasingly dependent
on mobile phones for any daily activity.
In this sense, initially a study was made on the theory of queues and on the various existing models.
A study of what queue management systems are and what examples exist today, comparing them and
checking the problems between them.
Thus, the main objective of this study is to develop a smartphone application that is a complement to
a queue management system that had this when compared to other existing queue management
systems, and that will essentially serve for the user to have access to the state of attendance of the
services of a certain entity or even get a ticket for a service. Its characterization was made using test
data, taking into account the time of arrival at a given service, the time for answering the password,
the duration of the service. In order to carry out this work, a relational database was already used
with real data of withdrawn passwords and calls made.
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Pace, Alessio. "Quelques défis posés par l'utilisation de protocoles de Gossip dans l'Internet." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00636386.
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Les systèmes pair-à-pair (P2P) sont aujourd'hui très populaires. Leur utilisation va de la messagerie instantanée au partage de fichiers, en passant par la sauvegarde et le stockage distribué ou encore le streaming video. Parmi les protocoles P2P, les protocoles basés sur le "gossip" sont une famille de protocoles qui a fait l'objet de nombreux travaux de recherche durant la dernière décennie. Les raisons de l'engouement pour les protocoles basés sur le "gossip" sont qu'ils sont considérés robustes, faciles à mettre en oeuvre et qu'ils ont des propriétés de passage à l'échelle intéressantes. Ce sont donc des candidats intéressants dès lors qu'il s'agit de réaliser des systèmes distribués dynamiques à large échelle. Cette thèse considère deux problématiques rencontrées lorsque l'on déploie des protocoles basé sur le "gossip" dans un environnement réel comme l'Internet. La première problématique est la prise en compte des pare-feux (NAT) dans le cadre des protocoles d'échantillonnage basés sur le "gossip". Ces protocoles font l'hypothèse que, a tout moment, chaque noeud est capable de communiquer avec n'importe quel noeud du réseau. Cette hypothèse est fausse dès lors que certains noeuds utilisent des NAT. Nous présentons Nylon, un protocole d'échantillonnage qui fonctionne malgré la présence de NAT. Nylon introduit un faible surcoût pour gérer les NAT et partage équitablement ce surcoût entre les noeuds possédant un NAT et les autres noeuds. La deuxième problématique que nous étudions est la possibilité de limiter la dissémination de messages de type "spam" dans les protocoles de dissémination basés sur le "gossip". Ces protocoles sont en effet des vecteurs idéaux pour diffuser les messages de type "spam" du fait qu'il n'y a pas d'autorité de contrôle permettant de filtrer les messages basés sur leur contenu. Nous proposons FireSpam, un protocole de dissémination basé sur le "gossip" qui permet de limiter la diffusion des messages de type "spam". FireSpam fonctionne par filtrage décentralisé (chaque noeud participe au filtrage). Par ailleurs, il fonctionne malgré la présence d'une fraction de noeuds malicieux (aussi appelés "Byzantins") et malgré la présence de noeuds dits "rationnels" (aussi appelés "égoïstes"). Ces derniers sont prêts à dévier du protocole s'ils ont un intérêt à le faire.
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Etzner, Sofia, and Linda Persson. "Att möta en människa, inte en transperson : Socialsekreterares förhållningssätt till och arbete med klienter som är transpersoner." Thesis, Hälsohögskolan, Jönköping University, HHJ, Avd. för socialt arbete, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-48836.
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Transpersoner är en samhällsgrupp som i stor utsträckning och på olika sätt missgynnas i förhållande till andra grupper i samhället. Samtidigt som den svenska socialtjänsten enligt lag har i uppdrag att främja människors jämlikhet i levnadsvillkor har transpersoner ett svagt förtroende för socialtjänsten. Detta på grund av upplevelser av dåligt bemötande från professionella. Denna studie fokuserar på socialsekreterare inom den svenska socialtjänsten och ämnar undersöka samt belysa på vilket sätt socialsekreterare förhåller sig till och arbetar med klienter som är transpersoner. Studiens material har samlats in genom tio semistrukturerade intervjuer med socialsekreterare i en region i södra Sverige. Materialet har analyserats med hjälp av tematisk analys för att ta fram mönster i socialsekreterarnas utsagor. Genom kodning och tematisering genererade den tematiska analysen tre teman som i denna studie benämns med människan som utgångspunkt, människokompetens i fokus och som riktlinje och människan bakom rollen som socialsekreterare. Studiens resultat analyserades med hjälp av delar av Butlers queerteori samt tidigare forskning inom det aktuella området. Socialsekreterarnas gemensamma ingång i det enskilda klientmötet är enligt dem själva att bemöta alla klienter lika och att försöka se människan bakom klienten. Det handlar därmed i det specifika mötet med klient med transidentitet i slutändan om att möta en människa, inte en transperson.Transgender people are in society at large and in many different ways more disadvantaged than other groups in society. Simultaneously as the Swedish social services by law are obliged to promote equality in people's living conditions transgender people have a low trust and confidence in the social services. This is due to experiences of being poorly treated by professionals. This study focuses on social service workers in the Swedish social services and has the purpose to examine and illuminate social service worker´s approach to and way of working with clients who are transgender. The data in this study have been collected through ten semi-structured interviews with social service workers in a region in southern Sweden. The data have been analysed by the use of thematic analysis in order to bring forth patterns in the social service worker´s statements. By coding and thematization the thematic analysis generated three themes that this study labels as with the human as the outset, humancompetence in focus and as guideline and the human behind the role as a social service worker. The result of this study was analysed with the help of parts of Butler's queer theory as well as previous research on the field of concern. The common way of entering a meeting with a client is according to the social service worker's themselves to treat all clients in the same way and to attempt to see the human behind the client. In the specific meeting with a client who have a transgender identity it therefore comes down to meeting a human, not a transgender person.
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Mohamed, Mahmud H. Etbega. "Some Active Queue Management Methods for Controlling Packet Queueing Delay. Design and Performance Evaluation of Some New Versions of Active Queue Management Schemes for Controlling Packet Queueing Delay in a Buffer to Satisfy Quality of Service Requirements for Real-time Multimedia Applications." Thesis, University of Bradford, 2009. http://hdl.handle.net/10454/4258.
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Traditionally the Internet is used for the following applications: FTP, e-mail and Web traffic. However in the recent years the Internet is increasingly supporting emerging applications such as IP telephony, video conferencing and online games. These new applications have different requirements in terms of throughput and delay than traditional applications. For example, interactive multimedia applications, unlike traditional applications, have more strict delay constraints and less strict loss constraints. Unfortunately, the current Internet offers only a best-effort service to all applications without any consideration to the applications specific requirements. In this thesis three existing Active Queue Management (AQM) mechanisms are modified by incorporating into these a control function to condition routers for better Quality of Service (QoS). Specifically, delay is considered as the key QoS metric as it is the most important metric for real-time multimedia applications. The first modified mechanism is Drop Tail (DT), which is a simple mechanism in comparison with most AQM schemes. A dynamic threshold has been added to DT in order to maintain packet queueing delay at a specified value. The modified mechanism is referred to as Adaptive Drop Tail (ADT). The second mechanism considered is Early Random Drop (ERD) and, iii in a similar way to ADT, a dynamic threshold has been used to keep the delay at a required value, the main difference being that packets are now dropped probabilistically before the queue reaches full capacity. This mechanism is referred to as Adaptive Early Random Drop (AERD). The final mechanism considered is motivated by the well known Random Early Detection AQM mechanism and is effectively a multi-threshold version of AERD in which packets are dropped with a linear function between the two thresholds and the second threshold is moveable in order to change the slope of the dropping function. This mechanism is called Multi Threshold Adaptive Early Random Drop (MTAERD) and is used in a similar way to the other mechanisms to maintain delay around a specified level. The main focus with all the mechanisms is on queueing delay, which is a significant component of end-to-end delay, and also on reducing the jitter (delay variation) A control algorithm is developed using an analytical model that specifies the delay as a function of the queue threshold position and this function has been used in a simulation to adjust the threshold to an effective value to maintain the delay around a specified value as the packet arrival rate changes over time. iv A two state Markov Modulated Poisson Process is used as the arrival process to each of the three systems to introduce burstiness and correlation of the packet inter-arrival times and to present sudden changes in the arrival process as might be encountered when TCP is used as the transport protocol and step changes the size of its congestion window. In the investigations it is assumed the traffic source is a mixture of TCP and UDP traffic and that the mechanisms conserved apply to the TCP based data. It is also assumed that this consists of the majority proportion of the total traffic so that the control mechanisms have a significant effect on controlling the overall delay. The three mechanisms are evaluated using a Java framework and results are presented showing the amount of improvement in QoS that can be achieved by the mechanisms over their non-adaptive counterparts. The mechanisms are also compared with each other and conclusions drawn.
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Ning, Xufei. "Push-based low-latency solution for Tracked Resource Set protocol : An extension of Open Services for Lifecycle Collaboration specification." Thesis, KTH, Radio Systems Laboratory (RS Lab), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-213126.
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Currently, the development of embedded system requires a variety of software and tools. Moreover, most of this software and tools are standalone applications, thus they are unconnected and their data can be inconsistent and duplicated. This increase both heterogeneity and the complexity of the development environment. To address this situation, tool integration solutions based on Linked Data are used, as they provide scalable and sustainable integration across different engineering tools. Different systems can access and share data by following the Linked-Data-based Open Service for Lifecycle Collaboration (OSLC) specification. OSLC uses the Tracked Resource Set (TRS) protocol to enable a server to expose a resource set and to enable a client to discover a resource in the resource set. Currently, the TRS protocol uses a client pull for the client to update its data and to synchronize with the server. However, this method is inefficient and time consuming. Moreover, high-frequency pulling may introduce an extra burden on the network and server, while low-frequency pulling increases the system’s latency (as seen by the client). A push-based low-latency solution for the TRS protocol was implemented using Message Queue Telemetry Transport (MQTT) technology. The TRS server uses MQTT to push the update patch (called a ChangeEvent) to the TRS client, then the client updates its content according to this ChangeEvent. As a result, the TRS client synchronizes with the TRS server in real time. Furthermore, a TRS adaptor was developed for Atlassian’s JIRA, a widely-used project and issue management tool. This JIRA-TRS adaptor provides a TRS provider with the ability to share data via JIRA with other software or tools which utilize the TRS protocol. In addition, a simulator was developed to simulate the operations in JIRA for a period of time (specifically the create, modify, and delete actions regarding issues) and acts as a validator to check if the data in TRS client matches the data in JIRA. An evaluation of the push-based TRS system shows an average synchronization delay of around 30 milliseconds. This is a huge change compared with original TRS system that synchronized every 60 seconds.Nuvarande inbyggda system kräver en mängd olika program och verktyg för att stödja dess utveckling. Dessutom är de flesta av dessa programvara och verktyg fristående applikationer. De är oanslutna och deras data kan vara inkonsistent och duplicerad. Detta medför ökad heterogenitet och ökar komplexiteten i utvecklingsmiljön. För att hantera denna situation används verktygsintegrationslösningar baserade på Länkad Data, eftersom de ger en skalbar och hållbar integrationslösning för olika tekniska verktyg. Olika system kan komma åt och dela data genom att följa den Länkad Data-baserade tjänsten Open Service for Lifecycle Collaboration (OSLC). OSLC använder TRS-protokollet (Tracked Resource Set) så att en server kan exponera en resursuppsättning och för att möjliggöra för en klient att upptäcka en resurs i resursuppsättningen. TRS-protokollet använder för tillfället pull-metoden så att klienten kan uppdatera sin data och synkronisera med servern. Denna metod är emellertid ineffektiv och tidskrävande. Vidare kan en högfrekvensdriven pull-metod införa en extra börda på nätverket och servern, medan lågfrekvensdriven ökar systemets latens (som ses av klienten). I det här examensprojektet implementerar vi en pushbaserad låg latenslösning för TRS-protokollet. Den teknik som används är Message Queue Telemetry Transport (MQTT). TRS-servern använder MQTT för att pusha uppdateringspatchen (som kallas ChangeEvent) till TRS-klienten. Därefter uppdaterar klienten dess innehåll enligt denna ChangeEvent. Vilket resulterar i att TRS-klienten synkroniseras med TRS-servern i realtid. Dessutom utvecklas en TRS-adapter för Atlassians JIRA som är ett välanvänt projekt och problemhanteringsverktyg. JIRA-TRS-adaptern tillhandahåller en TRS-leverantör med möjlighet att dela data via JIRA med annan programvara eller verktyg som använder TRS-protokollet. Dessutom utvecklade vi en simulator för att simulera verksamheten i JIRA under en tidsperiod (specifikt skapa, ändra och ta bort åtgärder rörande problem) och en validator för att kontrollera om data i TRS-klienten matchar data i JIRA. En utvärdering av det pushbaserade TRS-systemet visar en genomsnittlig synkroniseringsfördröjning på cirka 30 millisekunder. Detta är en stor förändring jämfört med det ursprungliga TRS-systemet som synkroniseras var 60:e sekund.