Segui questo link per vedere altri tipi di pubblicazioni sul tema: Based.
Tesi sul tema "Based"
Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili
Vedi i top-50 saggi (tesi di laurea o di dottorato) per l'attività di ricerca sul tema "Based".
Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.
Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.
Vedi le tesi di molte aree scientifiche e compila una bibliografia corretta.
1
Tane, Julien. "Query-based multicontexts for knowledge base browsing". [S.l. : s.n.], 2007. http://digbib.ubka.uni-karlsruhe.de/volltexte/1000007530.
Testo completo
2
Rousseau, Thomas. "Modélisation multi-échelle de la modification de structure d'un alliage à base de nickel soumis à de très fortes déformations plastiques en surface". Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEC016/document.
Testo completoAbstract (sommario):
La compréhension des effets du grenaillage ultrasonore sur l’intégrité de surface des composants métalliques représente un enjeu industriel important. Dans le cadre de cette thèse, une modélisation physique multi-échelle de la plasticité cristalline à la DEM (Discrete Element Model) a été développée. Le grenaillage ultrasonore consiste à mettre en mouvement des billes à l’intérieur d’une enceinte par vibration de la sonotrode. Les impacts répétés sur le matériau entraînent un écrouissage en surface, l’établissement de contraintes résiduelles de compression et la formation d’une couche nanostructurée. L’objectif de cette thèse est d’obtenir une meilleure compréhension des mécanismes conduisant à ces modifications sur un alliage à base nickel. Le mouvement des billes obtenu par DEM est relié aux modifications de la microstructure sous impacts via un modèle éléments finis utilisant une loi de plasticité cristalline. Après validation de chaque étape par des mesures expérimentales, le modèle a permis d’étudier l’effet de la quantité de billes utilisées dans le procédé. Ainsi, un nombre croissant de billes induit une augmentation d’impacts en biais de faible vitesse permettant de concentrer les contraintes résiduelles de compression en extrême surface. De plus, les simulations multi-impacts utilisant une loi de plasticité cristalline ont montré que ces impacts en biais engendraient une densité totale de dislocations et un niveau de désorientations élevées pouvant expliquer la fragmentation des grains et la nanostructuration de la surface. Enfin, ces modifications de la microstructure, visibles jusqu’à 300 µm de profondeur, sont en accord avec les profils de dureté obtenus par nano-indentation et les profils de désorientation issus de l’analyse EBSD (Electron BackScatter Diffraction)Ultrasonic shot peening is widely used to improve mechanical properties of metallic components. Mastering the effects of this surface treatment is a major industrial issue. A physical multi-scale modelling based on crystal plasticity and DEM (Discrete Element Model) was developed in this PhD thesis. This process is performed in a closed chamber where spherical balls are moved by sonotrode vibration. Thousands of impacts induce hardening, residual compressive stress and microstructure modification leading to a nanostructured layer. The aim of this work was to improve our understanding of the mechanisms occurring during this process on nickel-based alloys. Ball motion was computed by DEM and linked to microstructure modifications induced by impacts through a crystal plasticity finite element model. Experimental analyses were performed in order to validate each step of the multi-scale modelling. Then the model was applied to investigate ball quantity effects on peened surface modification. Increasing the number of balls created a larger quantity of low speed oblique impacts which concentrated the residual compressive stress near the surface. Furthermore multi-impacts performed with a crystal plasticity law showed oblique impacts enhanced dislocation storage and disorientations within grains, which could explain the nanostructuration of the peened surface. Moreover, the numerical microstructure modification, observed up to 300 µm in depth, was in agreement with hardness profiles obtained by nanoindentation and disorientation profiles measured by EBSD (Electron BackScatter Diffraction) analysis
3
Macfie, Alex. "Semantic role-based access control". Thesis, University of Westminster, 2014. https://westminsterresearch.westminster.ac.uk/item/964y2/semantic-role-based-access-control.
Testo completoAbstract (sommario):
In this thesis we propose two semantic ontological role-based access control (RBAC) reasoning processes. These processes infer user authorisations according to a set of role permission and denial assignments, together with user role assignments. The first process, SO-RBAC (Semantic Ontological Role-Based Access Control) uses OWL-DL to store the ontology, and SWRL to perform reasoning. It is based mainly on RBAC models previously described using Prolog. This demonstrates the feasibility of writing an RBAC model in OWL and performing reasoning inside it, but is still tied closely to descriptive logic concepts, and does not effectively exploit OWL features such as the class hierarchy. To fully exploit the capabilities of OWL, it was necessary to enhance the SO-RBAC model by programming it in OWL-Full. The resulting OWL-Full model, ESO-RBAC (Enhanced Semantic Ontological Role-Based Access Control), uses Jena for performing reasoning, and allows an object-oriented definition of roles and of data items. The definitions of roles as classes, and users as members of classes representing roles, allows user-role assignments to be defined in a way that is natural to OWL. All information relevant to determining authorisations is stored in the ontology. The resulting RBAC model is more flexible than models based on predicate logic and relational database systems. There are three motivations for this research. First, we found that relational database systems do not implement all of the features of RBAC that we modelled in Prolog. Furthermore, implementations of RBAC in database management systems is always vendor-specific, so the user is dependent on a particular vendor's procedures when granting permissions and denials. Second, Prolog and relational database systems cannot naturally represent hierarchical data, which is the backbone of any semantic representation of RBAC models. An RBAC model should be able to infer user authorisations from a hierarchy of both roles and data types, that is, determine permission or denial from not just the type of role (which may include sub-roles), but also the type of data (which may include sub-types). Third, OWL reasoner-enabled ontologies allow us to describe and manipulate the semantics of RBAC differently, and consequently to address the previous two problems efficiently. The contribution of this thesis is twofold. First, we propose semantic ontological reasoning processes, which are domain and implementation independent, and can be run from any distributed computing environment. This can be developed through integrated development environments such as NetBeans and using OWL APIs. Second, we have pioneered a way of exploiting OWL and its reasoners for the purpose of defining and manipulating the semantics of RBAC. Therefore, we automatically infer OWL concepts according to a specific stage that we define in our proposed reasoning processes. OWL ontologies are not static vocabularies of terms and constraints that define the semantics of RBAC. They are repositories of concepts that allow ad-hoc inference, with the ultimate goal in RBAC of granting permissions and denials.
4
Čanda, Valér. "Scalable symmetric block ciphers based on group bases". [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=962789755.
Testo completo
5
Pennala, J. (Joni). "Cloud-based testing of 4G base station software". Master's thesis, University of Oulu, 2017. http://urn.fi/URN:NBN:fi:oulu-201706022463.
Testo completoAbstract (sommario):
Executing test automation for large-scale software-intensive embedded systems requires a lot of hardware because tests must be executed for different hardware configurations. When there is not enough hardware for all kind of configurations, other solutions are developed to fill high test coverage with less hardware. Placing simulated configurations to the cloud makes the hardware usage more effective. The case company has developed a cloud-based testing service for embedded systems which are in this case 4G base stations. This study investigated how well the service fulfils the target team’s needs for testing. Testers have a different kind of requirements for cloud-based testing. Requirements were split into four categories from the qualitative data which was collected by interviewing testers of the target team. Requirement categories are test environments, test automation development, test execution and partly-simulated system under tests, more commonly known as SUTs. Four tests were implemented to the cloud with Robot Framework which is a test automation tool for developing automated tests. An empirical data showed that executing cloud-based tests is not always so fast due to long waiting times of getting a test environment from the cloud. However, when test environments were received they have initialised automatically with default settings and required testing tools. That reduces testers’ workload because locally built test environments require a lot of manual work like maintaining test environments. Beside other research questions, this study investigated fault detection capability of partly-simulated SUTs. 34 Cloud-based tests with partly-simulated SUTs were executed. 26 Tests passed and 8 tests failed. The simulator’s software caused only one failure and tested software caused other seven failures. From these statistics, we can at least say that the partly-simulated SUT can find some faults. The study also investigated a specific fault which was not found in the simulator even though it was found in the real SUT, which was a clear disadvantage.
6
Mathews, Steffy Ann. "Optimization of an SDR Based Aerial Base Station". Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1011834/.
Testo completoAbstract (sommario):
Most times people are unprepared to face natural disasters resulting in chaos, increased number of deaths, etc.Emergency responders need an efficiently working communication network to get in touch with the emergency services like hospitals, police, fire and rescue as well as people who are stranded. Such a network is also the need of the hour for survivors to contact their near and dear ones. One of the major barriers of communication during an emergency is the destruction of network elements. In case the communication devices survive the calamity, odds of the network getting congested are certainly high because almost everyone will be trying to use the same network resources. An important factor when dealing with emergency situations is the calls for an immediate response and an efficient Emergency Communication Systems (ECS). Currently there is a capability gap between existing ECS solutions and what we dream of achieving. Most current solutions do not meet cost or mobility constraints. An inexpensive, portable and mobile system will fulfill this capability gap. The main purpose of this research is to optimize the altitude and received signal strength of an aerial base station to provide maximum radio coverage on the ground as well as propose the best fit radio propagation channel model to carry out the experiment for the current scenario.
7
Reed, Alan. "Site-Based Management, Knowledge Base of Kentucky Superintendents". TopSCHOLAR®, 1990. http://digitalcommons.wku.edu/theses/1990.
Testo completoAbstract (sommario):
Recent educational literature has stressed the benefits of site-based management as a valuable tool in school reorganization. Following a recent ruling of the state Supreme Court and legislative mandate for implementation of site-based management, a survey was designed for the purpose of ascertaining the knowledge base among superintendents of the Commonwealth of Kentucky on the topic “site-based management” The data revealed that while there was considerable interest in site-based management among superintendents, there was also considerable confusion on the topic. Superintendents were largely unaware of a rather large body of research which clearly demonstrated the merits of participatory management in business and industry, and more recently site-based management in United States schools. Furthermore, the data revealed the existence of role ambiguity, resistance of role ambiguity, resistance to immediate implementation of site-based management, doubt over the longevity of site-based management, and nearly universal desire for training in site based-management for the respondents and their staff members. A number of recommendations were cited including the call for the superintendents to familiarize themselves with the abundant literature, standardization of terminology and immediate implementation of intensive training programs in site-based management for superintendents and others.
8
Rahman, Md Rashedur. "Knowledge Base Population based on Entity Graph Analysis". Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS092/document.
Testo completoAbstract (sommario):
Le peuplement de base de connaissance (KBP) est une tâche importante qui présente de nombreux défis pour le traitement automatique des langues. L'objectif de cette tâche est d'extraire des connaissances de textes et de les structurer afin de compléter une base de connaissances. Nous nous sommes intéressés à la reconnaissance de relations entre entités. L'extraction de relations (RE) entre une paire de mentions d'entités est une tâche difficile en particulier pour les relations en domaine ouvert. Généralement, ces relations sont extraites en fonction des informations lexicales et syntaxiques au niveau de la phrase. Cependant, l'exploitation d'informations globales sur les entités n'a pas encore été explorée. Nous proposons d'extraire un graphe d'entités du corpus global et de calculer des caractéristiques sur ce graphe afin de capturer des indices des relations entre paires d'entités. Pour évaluer la pertinence des fonctionnalités proposées, nous les avons testées sur une tâche de validation de relation dont le but est de décider l'exactitude de relations extraites par différents systèmes. Les résultats expérimentaux montrent que les caractéristiques proposées conduisent à améliorer les résultats de l'état de l'artKnowledge Base Population (KBP) is an important and challenging task specially when it has to be done automatically. The objective of KBP task is to make a collection of facts of the world. A Knowledge Base (KB) contains different entities, relationships among them and various properties of the entities. Relation extraction (RE) between a pair of entity mentions from text plays a vital role in KBP task. RE is also a challenging task specially for open domain relations. Generally, relations are extracted based on the lexical and syntactical information at the sentence level. However, global information about known entities has not been explored yet for RE task. We propose to extract a graph of entities from the overall corpus and to compute features on this graph that are able to capture some evidence of holding relationships between a pair of entities. In order to evaluate the relevance of the proposed features, we tested them on a task of relation validation which examines the correctness of relations that are extracted by different RE systems. Experimental results show that the proposed features lead to outperforming the state-of-the-art system
9
NAVA, GABRIELE. "Instantaneous Momentum-Based Control of Floating Base Systems". Doctoral thesis, Università degli studi di Genova, 2020. http://hdl.handle.net/11567/1004907.
Testo completoAbstract (sommario):
In the last two decades a growing number of robotic applications such as autonomous drones, wheeled robots and industrial manipulators started to be employed in several human environments. However, these machines often possess limited locomotion and/or manipulation capabilities, thus reducing the number of achievable tasks and increasing the complexity of robot-environment interaction. Augmenting robots locomotion and manipulation abilities is a fundamental research topic, with a view to enhance robots participation in complex tasks involving safe interaction and cooperation with humans. To this purpose, humanoid robots, aerial manipulators and the novel design of flying humanoid robots are among the most promising platforms researchers are studying in the attempt to remove the existing technological barriers. These robots are often modeled as floating base systems, and have lost the assumption -- typical of fixed base robots -- of having one link always attached to the ground.
From the robot control side, contact forces regulation revealed to be fundamental for the execution of interaction tasks. Contact forces can be influenced by directly controlling the robot's momentum rate of change, and this fact gives rise to several momentum-based control strategies. Nevertheless, effective design of force and torque controllers still remains a complex challenge. The variability of sensor load during interaction, the inaccuracy of the force/torque sensing technology and the inherent nonlinearities of robot models are only a few complexities impairing efficient robot force control.
This research project focuses on the design of balancing and flight controllers for floating base robots interacting with the surrounding environment. More specifically, the research is built upon the state-of-the-art of momentum-based controllers and applied to three robotic platforms: the humanoid robot iCub, the aerial manipulator OTHex and the jet-powered humanoid robot iRonCub. The project enforces the existing literature with both theoretical and experimental results, aimed at achieving high robot performances and improved stability and robustness, in presence of different physical robot-environment interactions.
10
Stander, Roschenka. "The Tax base of South African individuals : an international comparison". Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/41455.
Testo completoAbstract (sommario):
South Africa changed its tax system from a source-based to a resident-based
system in 2001. This change is in line with tax reforms worldwide. However,
over the last two decades, personal income tax reforms have not resulted in a
noticeable increase in tax revenue worldwide, even though governments find
themselves hard-pressed to maintain or increase their expenditure.
The aim of this study was to compare the South African tax base, which relies
on taxing individuals, with the tax base used in another developing country,
namely India, as well as to those applied in two developed countries, namely
the United Kingdom (UK) and the United States (US). This comparison
identified similarities and differences between the countries, and highlighted
possible improvements to South African tax legislation in order to broaden the
country‟s tax base and potentially increase tax revenues. For the purposes of
the study, a tax base can be defined as the total income of an individual, after
allowing for specified deductions, allowances and other adjustments, on which
tax is levied.
It was determined that the tax base used in South Africa is similar in some
respects to those used in India, the UK and the US. An improvement that South
Africa could adopt is the inclusion of the annual value of house property, as
specified in the Indian tax system. The employment abroad exclusion from
income could be replaced by a foreign-earned income exclusion, as applied in
the US tax system. It was also determined that permitting certain deductions
could in fact increase the tax base, as these deductions could entice taxpayers
to register for tax, therefore increasing tax compliance and ultimately increasing
tax revenue. By adopting any of the advantages of the other tax systems, South
Africa can broaden its tax base and generate additional tax revenue to support
the government‟s needs.Dissertation (MCom)--University of Pretoria, 2013.
gm2014
Taxation
unrestricted
11
Marotta, Angela. "Résines thermodurcissables et nanocomposites époxydes renouvelables à base de furanne pour les applications de revêtement". Thesis, Université Côte d'Azur (ComUE), 2019. http://www.theses.fr/2019AZUR4003/document.
Testo completoAbstract (sommario):
La recherche scientifique concernant les polymères biosourcés augmente rapidement pendant les dernières années, poussée par des croissantes préoccupations écologiques et économiques, ainsi que par l'incertitude sur la disponibilité future de ressources pétrochimiques limitées. Durabilité est un mot-clé de ce processus. Dans ce cadre, des produits respectueux de l'environnement, y compris des molécules et des additifs eco-compatibles, sont maintenant recherchés pour remplacer les polymères à base de pétrole par ceux dérivés de matières premières naturelles.Les résines époxydes sont des polymères thermodurcissables très polyvalents, extrêmement résistants à la corrosion, à l'humidité et aux produits chimiques, avec une bonne force d'adhérence à la plupart des matériaux et un faible retrait lors du durcissement. En raison de leurs températures de transition vitreuse élevées et de leur excellente résistance mécanique, les résines époxydes sont largement utilisées dans une large gamme d'applications, telles que l'électronique, les adhésifs structuraux, les composites pour l'aérospatiale et les revêtements protecteurs.Actuellement, plus des deux tiers des résines époxydes sont à base de diglycidyl éther de Bisphénol A. Dans cette industrie, la tendance à remplacer les matériaux dérivés du pétrole par des matériaux biosourcés est également liée à la nécessité de remplacer le bisphénol A (BPA), une molécule controversée, reconnu comme un perturbateur endocrinien et une substance reprotoxique. En particulier en application comme revêtement, l'utilisation de BPA présente un risque pour les utilisateurs d'aliments et de boissons conditionnés dans des récipients traités avec des résines époxydes. Les effets de la contamination du corps humain causée par le BPA sont le diabète, maladies cardiovasculaires, modification des enzymes hépatiques et les lésions de l'appareil reproducteur. Pour ces raisons, cette molécule a été interdite dans de nombreux pays pour la fabrication de produits pour enfants, ainsi qu'en France et au Canada de tous les matériaux en contact direct avec les aliments. La nécessité de développer de nouvelles résines époxy est donc urgente.Les molécules bio-dérivées développées depuis maintenant présentent des structures chimiques les plus diverses, chacune d’elles produisant des propriétés différentes des polymères finaux. Les caractéristiques particulières des résines époxydes sont liées à la structure aromatique de ses composants. Les molécules aromatiques présentes dans les matières premières naturelles proviennent principalement de la lignine, un des principaux constituants des parois cellulaires naturelles. Cependant, pour extraire des fragments aromatiques de la lignine, des procédés difficiles et consommateurs d’énergie sont nécessaires. Un substitut précieux des molécules aromatiques, facilement récupérables du glucose, sont les molécules furaniques ; leur validité a été étayée par plusieurs études.À la lumière de ce qui précède, les travaux présentés ici sont focalisés sur la production de résines époxyde à base de furane comme substitut potentiel de DGEBA dans l’industrie du revêtement de boîtes de conserve. Le cycle complet du matériau a été étudié : des synthèses de monomères époxydes furaniques ont été proposées, puis des thermodurcis époxydes ont été obtenus et caractérisés à la fois dans leurs propriétés chimiques et physiques (étude de la cinétique de durcissement, des propriétés mécaniques et thermiques). En outre, l’application des matériaux thermodurcissables époxydes proposés comme revêtement interne des boîtes de conserve a été testéeResearch on bio-based polymers is rapidly increasing in last years, pushed by growing environmental and economic concerns, as well as by the uncertainty about future availability of finite petrochemical resources. Sustainability is a keyword in this process. In this frame, products that are respectful towards the environment, including eco-compatible building blocks and additives, are now researched to replace petroleum-based polymers with those derived from naturally occurring feedstocks. Epoxy resins are very versatile thermosetting polymers, extremely resistant to corrosion, moisture and chemicals, with good adhesive strength toward most materials (wettability) and low shrinkage upon curing. Due to their high glass transition temperatures and excellent mechanical strength, epoxy resins are widely employed in a broad range of applications, such as electronics, structural adhesives, aerospace composites and protective coatings. More than two-thirds of epoxy resins nowadays are based on diglycidyl ether of bisphenol A. In this industry the trend to replace petrol-derived materials with bio-based ones is related also to the necessity to substitute the Bisphenol A (BPA), a controversial building block recognized as an endocrine disrupter and reprotoxic substance. In particular in application as coating, the use of BPA results in hazard for customers of food and beverage products packed into containers treated with epoxy resins. The effects of human body contamination caused by BPA are diabetes, cardiovascular diseases, altered liver enzymes and reproductive apparatus damages. For these reasons, this molecule has been banned in many countries for the manufacturing of child products, and in France and Canada from all the materials in direct contact with food. The necessity to develop new epoxy resins results therefore urgent.Bio-derived molecules since now developed show the most various chemical structure, each of them producing different properties of final polymers. Peculiar characteristic shown by epoxy resins are related to the aromatic structure of its components. Aromatic molecules present in natural feedstock are mainly derived from lignin, one of the principal constituents of natural cell walls. However, to extract aromatic moieties from lignin, difficult and energy consuming processes are required. A valuable replacement of aromatic molecules, easily recoverable from glucose, are furanic molecules; their validity has been supported by several studies. In the light of the above, the work here presented is focused on production of furanic bio-based epoxy resins as potential substitute of DGEBA in can coating industry. The complete cycle of the material has been studied: the synthesis of furanic epoxy monomers and epoxy thermosets, the characterization of their chemical and physical properties (study of curing kinetics, mechanical and thermal properties). Furthermore, the application of bio-based epoxy thermosets as cans internal lining has been evaluated. Experimental results demonstrated that the obtained resins have good potential to be proposed as good alternatives to the traditional BPA-containing epoxy resins
12
Challarapu, Muralidhar. "Slurry based coatings on silicon based ceramics". Cleveland, Ohio : Cleveland State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=csu1276196736.
Testo completoAbstract (sommario):
Thesis (M.S.)--Cleveland State University, 2009.Abstract. Title from PDF t.p. (viewed on June 25, 2010). Includes bibliographical references (p. 37-38). Available online via the OhioLINK ETD Center and also available in print.
13
Sivawamy, Ravichandran, e Geethanjali Soundappan. "File-Based Delivery over LTE-Based MBMS". Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2914.
Testo completoAbstract (sommario):
One of the most important emerging aspects of Third Generation Partnership Project (3GPP) is the Multimedia Broadcast/Multicast Service (MBMS) aiming to deliver multimedia contents to mobile users more efficiently in point-to-multipoint way. 3GPP also recommends an Application Layer Forward Error Correction (AL-FEC) scheme, especially for MBMS, in order to provide reliable transmission over mobile networks. Due to many emerging FEC schemes, the existing 3GPP standardized systematic fountain Raptor code FEC scheme is considered to be outdated. One of the newly emerged codes, namely RaptorQ, has enhanced an AL-FEC scheme by providing higher protection against packet loss and superior flexibility to meet the growing demand in mobile multicast services. In this work, we provide an extensive device based performance evaluation of RaptorQ FEC codes, specified as RFC 6330 in Internet Engineering Task Force (IETF), and notice that the performance always outperforms that of the existing Raptor (RFC 5053) codes in terms of decoding speed, latency and memory. We also include the device based performance comparison of RaptorQ FEC codes in a comparison with other FEC schemes like Supercharged codes and Reed Solomon + Low Density Parity Check codes (RS+ LDPC). Finally, we conduct simulation carried out in the mobile devices for several network parameters like latency, decoding speed and memory in combination with FEC encoding and decoding parameters and investigate that RaptorQ is the best code that suits multicast services.+46723185198, +4917626686238,+4915166808450
14
Tsintsifas, Athanasios. "Computer based assessment of diagram based coursework". Thesis, University of Nottingham, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.395603.
Testo completo
15
Khaja, Abdul Sameer K. "Slurry Based Coatings on Silicon Based Ceramics". Cleveland State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=csu1226963530.
Testo completo
16
Stanley, James, Nicholas R. Perkins, Laura Zander e James Stanley. "Implementation of activity based cost management aboard base installations". Monterey, California. Naval Postgraduate School, 2004. http://hdl.handle.net/10945/9957.
Testo completoAbstract (sommario):
Approved for public release; distribution is unlimited.MBA Professional Report
Approved for public release; distribution is unlimited.
This project is a comparative analysis of the implementation process of Activity Based Cost Management of Marine Corps Logistics Base, (MCLB), Albany, and the implementation procedures used aboard MCB Camp Lejeune. Interviews and data gathering were conducted to identify how the respective Business Performance Offices (BPO), plan, implement, monitor, and measure performance of their process to introduce ABCM at the base installation level. We studied the means by which the two organizations allocated resources to this change process and their cost objects. An analysis of benchmarking goals as well as relative barriers to the implementation was conducted to find commonalities between the two, or to determine if those goals and barriers were unique to each organization. It should be highlighted that this project is not intended to identify which, if either, process is superior or if inherent problems or impediments are attributable to internal issues within the respective organizations. The project describes and discusses environmental differences that facilitate or hinder the implementation and offers recommendations to aid in ABCM implementation process procedures.
17
Rosengren, Hellman Jonas. "Modular Battery Base Unit : A Method-Based Design Approach". Thesis, KTH, Maskinkonstruktion (Inst.), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-183421.
Testo completoAbstract (sommario):
This thesis covers a product development process carried out in collaboration with Ericsson –Enclosure & Power and their development of Radio Base Stations (RBS). As Ericsson expands into new markets, the different customer demands on their support systems increases in number and variation. In order to improve their business structure and still provide a wide array of product solutions, they are currently developing a new modular product family. Today numerous methods for product modularization exist, but there is a lack of experience of using such methods at Ericsson – Enclosure & Power. This thesis is an exploration of what methods could be suitable to use in this context, and how to implement them in a beneficial way. The object of study is the Battery Base Unit (BBU), a mounting base for RBS cabinets that contains a compartment for backup batteries. A methodology is suggested for developing this product in a way that secures a proper modular structure. Part of the methodology consists of standard product development methods such as Quality Function Deployment (QFD), concept selection and prototyping. The other part consist of the modularization methods Function Structure Heuristics and Design Structure Matrix (DSM), that are employed first on functional level before developing concepts and secondly on component-based level while detailing the final concept. The thesis describes how these implementations have been made, how the product have been developed from idea to prototype and the resulting product modularity. The final design is evaluated against the product specification and the benefits and drawbacks of using a formalized modularization process for product development at Ericsson – Enclosure & Power are discussed.Detta arbete handlar om den produktutveckling som utförts i samarbete med Ericsson –Enclosure & Power och deras utveckling av kabinett för radiobasstationer (RBS). Ericssons expansion på nya marknader ökar mängden krav på deras olika supportsystem. För att kunna vidareutveckla sin verksamhet och samtidigt erbjuda ett stort antal produktlösningar utvecklar de för närvarande en ny modulbaserad produktfamilj. Idag finns ett flertal metoder för produktmodularisering men man saknar erfarenhet av att arbeta med sådana metoder på Ericsson– Enclosure & Power. Detta arbete undersöker vilka metoder som är lämpliga att använda i detta sammanhang, och hur man på bästa sätt ska implementera dem. Objektet för denna studie är Batteribasenheten (BBUn) som är ett fundament för montering av RBS kabinettet med ett utrymme för reservbatterier. Ett övergripande tillvägagångssätt föreslås för att säkerställa att utvecklingen av denna produkt inkluderar en bra modulär uppbyggnad. Delvis består tillvägagångssättet av vanliga produktutvecklingsmetoder såsom Quality Function Deployment (QFD), koncepturval och prototyper. I övrigt består det i modulariseringsmetoderna Function Structure Heuristics och Design Structure Matrix (DSM) som används först på funktionsnivå innan konceptgenereringsfasen och därefter på komponentnivå under detaljutvecklingen av det slutliga konceptet. Detta arbete beskriver hur dessa metoder har implementerats, hur produktenhar utvecklats från idé till prototyp samt den resulterande produktmodulariteten. Den slutliga utformningen utvärderas mot den angivna kravspecificeringen och fördelarna och nackdelarna med att använda en formaliserad metod för produktutveckling på Ericsson – Enclosure & Power diskuteras.
18
Lissitsyn, Denis. "A knowledge-based technology advising system for web-based application development". Ohio University / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1173983075.
Testo completo
19
Léglise, Mélissa. "Amélioration des propriétés mécaniques et chimiques de superalliages base nickel et base cobalt de fonderie utilisés pour le fibrage du verre fondu à 1000°C - 1100°C". Thesis, Université de Lorraine, 2018. http://www.theses.fr/2018LORR0228.
Testo completoAbstract (sommario):
Les assiettes de fibrage utilisées pour la production de fibres de verre subissent d’importantes contraintes mécaniques, chimiques et thermiques. Par conséquent, cette pièce se dégrade et doit être périodiquement remplacée. Le but de ces travaux est d’augmenter la durée de vie des assiettes de fibrage en améliorant les propriétés mécaniques et chimiques des superalliages qui les constituent. Plus précisément, l’objectif de cette thèse est, dans un premier temps, d’améliorer les alliages utilisés pour le fibrage à 1000°C, puis dans un second temps, de trouver un superalliage pouvant fibrer à 1125°C. Ces travaux ont été menés sur deux familles de superalliages : base nickel et base cobalt. Les propriétés chimiques ont été caractérisées par des essais thermogravimétriques et les propriétés mécaniques par des essais de fluage flexion 3 points. Pour l’alliage base Ni, l’influence des éléments minoritaires subis, Mn et Si, a été étudiée. Les propriétés mécaniques de cet alliage ont fait, ensuite, l’objet d’essais d’amélioration par l’addition de titane, zirconium, tantale, hafnium et de niobium. L’addition d’aluminium a été aussi expérimentée mais ayant pour but d’améliorer les propriétés chimiques de l’alliage. Enfin, des études ont été aussi menées sur l’addition de métaux nobles (Pd et Ru) et de terres rares (Y, La et Ce). Concernant les superalliages base cobalt, l’étude s’est portée sur un alliage base Co qui a antérieurement montré de bonnes propriétés générales pour une utilisation à 1125°C et non à 1000°C. Des variantes avec une teneur abaissée en tantale, sans hafnium et sans tungstène ont été étudiées. Pour clore ces travaux, l’augmentation de la teneur en nickel et un traitement thermique ont été étudiés afin d’améliorer la résistance à l’oxydation de ce second alliageThe fiberizing spinners used to produce the glass fibers undergo sizable mechanical, chemical and thermal solicitations. Therefore, this piece is degraded and must be periodically replaced. The purpose of these works is to increase the lifetime of the fiberizing spinners by improving the mechanical and chemical properties of the superalloys that constitute them. More precisely, the objective of this thesis is, in the first time, to improve the alloys used to fiberize at 1000°C, and in a second time, to find a superalloy that can fiberize at 1125°C. These works are focused on two families of superalloys: nickel-based and cobalt-based. The chemical properties are characterized by the thermogravimetry tests and the mechanical properties by 3 points flexural creep tests. For the Ni-based alloy, the influences of unwanted minority elements, Mn and Si, were studied. The mechanical properties of this alloy are subject to improvement tests by the addition titanium, zirconium, tantalum, hafnium and niobium. The aluminium addition was also experimented but with the aim of improving the chemical properties of the alloy. Finally, the studies were also driven on the addition of noble metals (Pd and Ru) and of rare earths (Y, La and Ce). Concerning the cobalt-based superalloys, the study focused on an alloy which has previously shown good general properties to be used at 1125°C and no at 1000°C. The versius with a lowered content in tantalum, without tungsten and without hafnium were studied. To close this work, the increase of nickel and a heat treatment were studied in order to improve the oxidation resistance of this second alloy
20
Trimmel, Stefan. "Evaluation of Model-Based Testing on a Base Station Controller". Thesis, Linköping University, Department of Computer and Information Science, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-12059.
Testo completoAbstract (sommario):
This master thesis investigates how well suited the model-based testing process is for testing a new feature of a Base Station Controller. In model-based testing the tester designs a behavioral model of the system under test, or some part of the system. This model is then given to a test generation tool that will analyze the model and produce interesting test cases. These test cases can either be run on the system in an automatic or manual way depending on what type of setup there is.
In this report it is suggested that the behavioral model should be produced in as early a stage as possible and that it should be a collaboration between the test team and the design team.
The advantages with the model-based testing process are a better overview of the test cases, the test cases are always up to date, it helps in finding errors or contradictions in requirements and it performs closer collaboration between the test team and the design team. The disadvantages with model-based testing process are that it introduces more sources where an error can occur. The behavioral model can have errors, the layer between the model and the generated test cases can have errors and the layer between the test cases and the system under test can have errors. This report also indicates that the time needed for testing will be longer compared with manual testing.
During the pilot, when a part of a new feature was tested, of this master thesis a test generation tool called Qtronic was used. This tool solves a very challenging task which is generating test cases from a general behavioral model and with a good result. This tool provides many good things but it also has its shortages. One of the biggest shortages is the debugging of the model for finding errors. This step is very time consuming because it requires that a test case generation is performed on the whole model. When there is a fault in the model then this test generation can take very long time, before the tool decides that it is impossible to cover the model.
Under the circumstances that the Qtronic tool is improved on varies issues suggested in the thesis, one of the most important issues is to do something about the long debugging time needed, then the next step can be to use model-based testing in a larger evaluation project at BSC Design, Ericsson.
21
Dewi, Christa. "Integrating an asset-based approach into community-based tuberculosis care in Eastern Indonesia". Thesis, The University of Sydney, 2016. http://hdl.handle.net/2123/16371.
Testo completoAbstract (sommario):
Background: The global Stop TB Strategy introduced by the World Health Organization included empowering people with tuberculosis (TB) as a key element in TB care and prevention. The community can successfully contribute to achieving high levels of coverage of TB diagnosis and treatment. However, whether the community is a true partner or a mere beneficiary of the health interventions and whether locally led initiatives are sustainable in the long term remain the main challenges in involving the community in TB care. An asset-based approach emphasises positive capabilities, nurtures the strengths and resources of local people, and has potential to reinforce participation, local leadership and sustainable initiatives at the community level. While asset-based approaches have been found to be effective for other issues, no published studies were identified that utilised asset-based approaches in interventions to empower TB patients or to guide community-based TB care. This study implemented an asset-based intervention with leadership groups in small number of rural Indonesian villages where TB is prevalent. Goal: This project aimed to integrate an asset-based approach into an existing TB program and to assess whether this approach could reduce the communities’ dependency on the TB service provided by a non-government organisation. It also aimed to investigate whether this approach could improve the current TB program and the communities’ knowledge and behaviours related to TB prevention and case finding. Methods: The study applied the principle of community-based participatory research. An asset-based intervention was implemented with TB leadership groups in three villages, and another three similar villages provided a comparison group. Semi-structured interviews were conducted with 50 participants, including village TB volunteers, TB patients, ex-TB patients, village leaders and public health centre staff at the beginning of the study and repeated six months after the asset-based intervention in all six villages. A record audit to assess case finding was also conducted. Two- to 4-day asset-mapping workshops were carried out in the three intervention villages. Monthly visits, home visits, informal discussions, group discussions, and observations recorded in field notes were conducted following the intervention. Similar follow-up activities were performed in the comparison villages. Thematic analysis was performed on interview data to describe the experiences of the TB leadership groups and key stakeholders after the asset-based intervention, and simple descriptive analysis using frequencies was carried out on field notes and observational data collected to describe each theme of knowledge about TB. Results: The intervention successfully generated significant changes in relation to the TB leadership groups’ perceptions of themselves and their leadership capacity, built dialogue among stakeholders, strengthened local initiatives and encouraged community engagement. This in turn improved community-based TB activities and improved knowledge of TB and behaviours related to prevention of TB and early case finding. These changes did not occur in the comparison villages. Thematic analysis of the experiences of TB leadership group members and key stakeholders revealed that local leadership and the role of ‘catalyst’ were the most important factors in the success of the intervention and in ensuring the continuation of the TB program. Conclusion: Despite several barriers identified during the study, the approach and techniques demonstrated in this study may represent an effective method to engage communities, build local leadership and deliver outcomes that could be generalisable to similar settings and other health issues.
22
Mülâyim, Mehmet Oǧuz. "Anytime Case-Based Reasoning in Large-Scale Temporal Case Bases". Doctoral thesis, Universitat Autònoma de Barcelona, 2020. http://hdl.handle.net/10803/671283.
Testo completoAbstract (sommario):
L'enfocament de la metodologia Casi-Based Reasoning (CBR) per a la resolució de problemes que "problemes similars tenen solucions similars" ha demostrat ser bastant favorable per a moltes aplicacions d'intel·ligència artificial industrial. No obstant això, els mateixos avantatges de CBR dificulten el seu acompliment ja que les bases de casos (CB) creixen més que mides raonables. Cercar casos similars és costós. Aquest desavantatge sovint fa que CBR sigui menys atractiu per als entorns de dades abundants d'avui dia, mentre que, en realitat, cada vegada hi ha més raons per beneficiar-se d'aquesta metodologia eficaç. En conseqüència, l'enfocament tradicional de la comunitat CBR de controlar el creixement de la CB per mantenir el rendiment està canviant cap a la recerca de noves formes de tractar amb dades abundants.
Com a contribució a aquests esforços, aquesta tesi té com a objectiu accelerar el CBR aprofitant tant els espais de problemes com els de solucions en els CB de gran escala que es componen de casos relacionats temporalment, com en l'exemple de les històries clíniques electròniques. Per a les ocasions en què l'acceleració que vam aconseguir per obtenir resultats exactes encara no sigui factible, dotem el sistema CBR amb capacitats d'algoritmes anytime per proporcionar resultats aproximats amb confiança en cas d'interrupció. Aprofitar la temporalitat dels casos ens permet assolir guanys superiors en el temps d'execució per als CB de milions de casos. Els experiments amb conjunts de dades del món real disponibles públicament fomenten l'ús continu de CBR en dominis en els quals CBR històricament sobresurt com l'atenció mèdica; i al seu torn, no patint, sinó gaudint del big data.El enfoque de la metodología Case-Based Reasoning (CBR) para la resolución de problemas de que "problemas similares tienen soluciones similares" ha demostrado ser bastante favorable para muchas aplicaciones de inteligencia artificial industrial. Sin embargo, las mismas ventajas de CBR dificultan su desempeño ya que las bases de casos (CB) crecen más que tamaños razonables. Buscar casos similares es costoso. Esta desventaja a menudo hace que CBR sea menos atractivo para los entornos de datos abundantes de hoy en día, mientras que, en realidad, cada vez hay más razones para beneficiarse de esta metodología eficaz. En consecuencia, el enfoque tradicional de la comunidad CBR de controlar el crecimiento de la CB para mantener el rendimiento está cambiando hacia la búsqueda de nuevas formas de tratar con datos abundantes. Como contribución a estos esfuerzos, esta tesis tiene como objetivo acelerar el CBR aprovechando tanto los espacios de problemas como los de soluciones en los CB de gran escala que se componen de casos relacionados temporalmente, como en el ejemplo de las historias clínicas electrónicas. Para las ocasiones en las que la aceleración que logramos para obtener resultados exactos aún no sea factible, dotamos al sistema CBR con capacidades de algoritmos anytime para proporcionar resultados aproximados con confianza en caso de interrupción. Aprovechar la temporalidad de los casos nos permite alcanzar ganancias superiores en el tiempo de ejecución para los CB de millones de casos. Los experimentos con conjuntos de datos del mundo real disponibles públicamente fomentan el uso continuo de CBR en dominios en los que CBR históricamente sobresale como la atención médica; y a su vez, no sufriendo, sino disfrutando del big data.
Case-Based Reasoning (CBR) methodology's approach to problem-solving that "similar problems have similar solutions" has proved quite favorable for many industrial artificial intelligence applications. However, CBR's very advantages hinder its performance as case bases (CBs) grow larger than moderate sizes. Searching similar cases is expensive. This handicap often makes CBR less appealing for today's ubiquitous data environments while, actually, there is ever more reason to benefit from this effective methodology. Accordingly, CBR community's traditional approach of controlling CB growth to maintain performance is shifting towards finding new ways to deal with abundant data. As a contribution to these efforts, this thesis aims to speed up CBR by leveraging both problem and solution spaces in large-scale CBs that are composed of temporally related cases, as in the example of electronic health records. For the occasions when the speed-up we achieve for exact results may still not be feasible, we endow the CBR system with anytime algorithm capabilities to provide approximate results with confidence upon interruption. Exploiting the temporality of cases allows us to reach superior gains in execution time for CBs of millions of cases. Experiments with publicly available real-world datasets encourage the continued use of CBR in domains where it historically excels like healthcare; and this time, not suffering from, but enjoying big data.
Universitat Autònoma de Barcelona. Programa de Doctorat en Informàtica
23
Stewart, Andrew D. "Comparing time-based and hybrid time-based/frequency based multi-platform geo-location systems". Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1997. http://handle.dtic.mil/100.2/ADA337369.
Testo completoAbstract (sommario):
Thesis (M.S. in Operations Research) Naval Postgraduate School, September. 1997.Thesis advisor(s): Arnold H. Buss. "September 1997." Includes bibliographical references (p. 95-96). Also available online.
24
Myers, David S. "An Extensible Component-Based Architecture for Web-Based Simulation Using Standards-Based Web Browsers". Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/10123.
Testo completoAbstract (sommario):
Web-based simulation (WBS) systems offer tradeoffs between user interactivity and hardware requirements striking to seek a balance between the differing concerns. Server-based systems offer little interactivity or concurrent visualization capabilities, while client-based systems have increased hardware requirements asking the user to provide high-end workstations. Concurrent visualization of simulation output proves execution intensive, or unusable in some situations. Creating an execution efficient and user friendly WBS system greatly improves user experience while gaining all of the benefits inherent in a web-based system such as high accessibility and ease of maintenance. In order to provide a usable concurrent visualization WBS this thesis developed the Web-Based Queuing System Simulation System (WebQS3). WebQS3 splits the responsibilities of simulation execution and simulation visualization into a client-server environment; the client is responsible for the visualization display and server is responsible for simulation execution. The system differs from many previous WBS systems in that the client-side application is developed using web-standard technologies such as HTTP, XML, SVG, and ECMAScript instead relying on Java Applets and associated technologies. Using web-standards as the foundation of the client agent opens the visualization and model construction functionality to any user that accesses the application using a web browser while also making the application more scalable in terms of user load. Implementing the client with web-standards also included the development of an asynchronous client-server communication protocol as opposed to traditional synchronous communication protocols used by Java WBS systems. The asynchronous protocol demonstrates similar or better execution performance than similar synchronous communication protocols in most quality characteristics. By creating a WBS system using web-standards implemented in most modern web browsers any user may visit the WebQS3 site and have simulation tools available for use. Providing simulation services on the web makes eases the creation of simulation models my making the tools to readily available while facilitating information sharing and collaboration over the web. The WebQS3 system serves as a model to drive research in WBS systems away from proprietary Java technologies to web standards for front-end visualization technologies.Master of Science
25
Henric, Hedin. "Comparison of Node Based Versus Layer Based Compositing". Thesis, University of Gävle, Department of Industrial Development, IT and Land Management, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-7131.
Testo completoAbstract (sommario):
In movie post-production, compositing is the art of combining visual elements into one seamless shot. There are two classes of programs used to accomplish this: those that are node based and those that are layer based. This research report tries to determine whether there is a great difference between the workflow from two types of compositing software, and if the same result can be achieved by both types of programs. Therefore, it would be especially interesting to small businesses, schools or private users, since most node based programs are usually too expensive to purchase. To perform this experiment, a short film clip requiring a moderate amount of post-production is composited in two different programs; one node based and one layer based, in order that the differences can be studied. The final results are that there is little difference in the visual quality of the end result between the two programs, and that the higher cost of a node based program may not necessarily be worth it for smaller businesses and single users.
26
Valle, Kjetil. "Graph-Based Representations for Textual Case-Based Reasoning". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for datateknikk og informasjonsvitenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13575.
Testo completoAbstract (sommario):
This thesis presents a graph-based approach to the problem of text representation. The work is motivated by the need for better representations for use in textual Case-Based Reasoning (CBR). In CBR new problems are solved by reasoning based on similar past problem cases. When the cases are represented in free text format, measuring the similarity between a new problem and previously solved problems become a challenging task. The case documents need to be re-represented before they can be compared/matched.Textual CBR (TCBR) addresses this issue. We investigate automatic re-representation of textual cases, in particular measuring the salience of features (entities in the text) towards this end. We use the classical vector space model in Information Retrieval (IR) but investigate whether graph-representation and salience inference using graphs can improve on the Term Frequency (TF) and Term Frequency-Inverse Document Frequency (TF-IDF) measures, emph{bag of words} approaches predominant in IR.Our special focus is whether, and possibly how, the co-occurrence and the syntactic dependency relations between terms have an impact on feature weighting. We measure salience through the notion of graph centrality. We experiment with two types of application tasks, classification and case retrieval. Although classification is not a typical TCBR task, it is easier to find datasets for this application, and the centrality measures we have studied are not specific to TCBR. The experiments on this task are therefore relevant to the second application task which is our ultimate target. We test various centrality metrics described in the literature, make a distinction between local and global weighting measures and compare them for both application tasks. In general, our graph-based salience inference methods perform better than TF and TF-IDF.
27
Deb, Sagarmay. "Content-based image retrieval based on emergence index". University of Southern Queensland, Faculty of Sciences, 2003. http://eprints.usq.edu.au/archive/00001420/.
Testo completoAbstract (sommario):
Emergence is a phenomenon where we study the implicit or hidden meaning of an image. We introduce this concept in image database access and retrieval of images using his as an index for retrieval. This would give an entirely different search outcome than ordinary search where emergence is not considered, as consideration of hidden meanings could change the index of search. A feature of an image, which is not explicit would be emergent feature if it can be made explicit. There are three types of emergence: computational emergence, thermodynamic emergence and emergence relative to a model. In computational emergence, it is assumed computational interactions can generate different features or behaviors. This is one of the approaches in the field of artificial life. Thermodynamic emergence is of the view that new stable features or behaviors can arise from equilibrium through the use of thermodynamic theory. In emergence relative to a model, deviation of the behavior from the original model gives rise to emergence. We would use this latter view in our work. Two classes of shape emergence have been identified: embedded shape emergence and illusory shape emergence. In embedded shape emergence all the emergent shapes can be identified by set theory procedures on the original shape under consideration. For example, in a set S= {a,b,c,d,e}, we can find subsets like S1={a,b,c}, S2={c,d,e}, S3={a,c,e} and so on. But in illusory shape emergence, where contours defining a shape are perceived even though no contours are physically present, this kind of set theory procedures are not enough and more effective procedures have to be applied to find these hidden shapes. These procedures could be based on geometrical, topological or dimensional studies of the original shape. Content-based Image Retrieval (CBIR) techniques, so far developed, concentrated on only explicit meanings of an image. But more meanings could be extracted when we consider the implicit meanings of the same image. To find out the implicit meanings, we first destroy the shape of the original image which gives rise to unstructured image. Then we process the unstructured image to bring out the new emergent image. We discuss emergence, calculation of emergence index and accessing multimedia databases using emergence index in this dissertation. To calculate emergence index in the access of multimedia databases, we take an input image and study the emergence phenomenon of it. Also we study the emergence phenomenon of the images of the database. Both input image and images of database would give rise to more meanings because of emergence as we explained earlier. Based on the new meanings, wherever there would be a match between input image and images of database, we would pick that record up for selection. We defined emergence index as EI = f(D,F,V,C,E) where D stands for domain of the database, F for features of the image, V for various variables that define the image, C for constraints which represent the image and E for emergence phenomenon. We calculate these five variables to get emergence index for each image of the database. Also we calculate these five variables for input image as well. We talk about global aspects of features. It means features of the entire image. Examples are area, perimeter or rectangles, triangles. In some searches, to consider the global features could be advantageous in that a symmetry with the input image could be obtained on the basis of global features only. But as is clearly the case, to consider global features could overlook the individual objects that constitute the image as a whole. In the kind of searches we propose, we take into account the global features of the image of the database while considering in detail local features. Various objects that lie within an image constitute local features. In our example, there are three objects in the image, namely, a lake and two houses. Studying the features of these three objects would add to studying the features of the image globally. We took the example of a geographic location in the thesis and then showed how destruction of original image is done and further processing of the unstructured image gives new emergent image. Partial implementation of this concept is also presented at the end. In implementation, we consider the retrieval of image globally. We do not consider break-up of image into multiple objects which is left for future research.
28
Gan, Zhifeng. "An object-based approach to image-based rendering". Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B38731836.
Testo completo
29
Montrieux, Lionel. "Model-based analysis of role-based access control". Thesis, Open University, 2013. http://oro.open.ac.uk/38672/.
Testo completoAbstract (sommario):
Model-Driven Engineering (MDE) has been extensively studied. Many directions have been explored, sometimes with the dream of providing a fully integrated approach for designers, developers and other stakeholders to create, reason about and modify models representing software systems. Most, but not all, of the research in MDE has focused on general-purpose languages and models, such as Java and UML. Domain-specific and cross-cutting concerns, such as security, are increasingly essential parts of a software system, but are only treated as second-class citizens in the most popular modelling languages. Efforts have been made to give security, and in particular access control, a more prominent place in MDE, but most of these approaches require advanced knowledge in security, programming (often declarative), or both, making them difficult to use by less technically trained stakeholders. In this thesis, we propose an approach to modelling, analysing and automatically fixing role-based access control (RBAC) that does not require users to write code or queries themselves. To this end, we use two UML profiles and associated OCL constraints that provide the modelling and analysis features. We propose a taxonomy of OCL constraints and use it to define a partial order between categories of constraints, that we use to propose strategies to speed up the models’ evaluation time. Finally, by representing OCL constraints as constraints on a graph, we propose an automated approach for generating lists of model changes that can be applied to an incorrect model in order to fix it. All these features have been fully integrated into a UML modelling IDE, IBM Rational Software Architect.
30
Gan, Zhifeng, e 甘智峰. "An object-based approach to image-based rendering". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B38731836.
Testo completo
31
Bligh, Brett. "Formative computer based assessment in diagram based domains". Thesis, University of Nottingham, 2007. http://eprints.nottingham.ac.uk/13569/.
Testo completoAbstract (sommario):
This research argues that the formative assessment of student coursework in free-form, diagram-based domains can be automated using CBA techniques in a way which is both feasible and useful. Formative assessment is that form of assessment in which the objective is to assist the process of learning undertaken by the student. The primary deliverable associated with formative assessment is feedback. CBA courseware provides facilities to implement the full lifecycle of an exercise through an integrated, online system. This research demonstrates that CBA offers unique opportunities for student learning through formative assessment, including allowing students to correct their solutions over a larger number of submissions than it would be feasible to allow within the context of traditional assessment forms. The approach to research involves two main phases. The first phase involves designing and implementing an assessment course using the CourseMarker / DATsys CBA system. This system, in common with may other examples of CBA courseware, was intended primarily to conduct summative assessment. The benefits and limitations of the system are identified. The second phase identifies three extensions to the architecture which encapsulate the difference in requirements between summative assessment and formative assessment, presents a design for the extensions, documents their implementation as extensions to the CourseMarker / DATsys architecture and evaluates their contribution. The three extensions are novel extensions for free-form CBA which allow the assessment of the aesthetic layout of student diagrams, the marking of student solutions where multiple model solutions are acceptable and the prioritisation and truncation of feedback prior to its presentation to the student. Evaluation results indicate that the student learning process can be assisted through formative assessment which is automated using CBA courseware. The students learn through an iterative process in which feedback upon a submitted student coursework solution is used by the student to improve their solution, after which they may re-submit and receive further feedback.
32
Hull, S. "Precipitation in aluminium based and iron based alloys". Thesis, University of Reading, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370120.
Testo completo
33
Pearson, James. "Plenoptic layer-based modeling for image based rendering". Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/24410.
Testo completoAbstract (sommario):
Image based rendering is an attractive alternative to model based rendering for generating novel views due to its lower complexity and potential for photo-realistic results. In order to reduce the number of images necessary for alias-free rendering, some geometric information for the 3D scene is normally necessary. Because the assumptions underlying Plenoptic theory are not fully met in practice, some aliasing is always present in real world examples. We will describe how we can mitigate these errors and achieve the performance predicted in plenoptic theory on real world data. We will present a fast unsupervised layer-based method for synthesising arbitrary new view of a scene from a set of existing views. Our algorithm takes advantage of the knowledge of the typical structure of multiview data in order to perform occlusionaware layer extraction. Moreover, the number of depth layers used to approximate the geometry of the scene is chosen using Plenoptic sampling theory. We further generalise this theory to allow the use of angled layers and multiple camera planes. The rendering is achieved by using a probabilistic interpolation approach and by extracting the depth layer information on a small number of key images. Simulation results show that our method is only 0.25 dB away from the ideal performance achieved when having access to the ground truth pixel based geometric information of the scene and comparisons are also made to alternative methods. These results demonstrates the effectiveness of our method and the validity of the layer-based model.
34
Walker, Ryan J. "Influences on Fact-Based and Simulation-Based Comparisons". Miami University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=miami1436864248.
Testo completo
35
O'Reilly, Una-May Carleton University Dissertation Computer Science. "Using case-based reasoning for knowledge-based assistance". Ottawa, 1990.
Cerca il testo completo
36
Waters, Donna. "Evidence : the knowledge of most worth". University of Sydney, 2006. http://hdl.handle.net/2123/1903.
Testo completoAbstract (sommario):
Doctor of PhilosophySimilar to their colleagues throughout the world, nurses and midwives in New South Wales (NSW), Australia, welcome evidencebased practice (EBP) as a means to improve patient or client outcomes. This thesis explores the way nurses and midwives understand evidence for EBP and aims to determine whether members of these professions currently have the knowledge and skills necessary to implement evidence‐based care. Three separate studies were conducted to explore NSW nurses’ readiness for EBP. Attitudes, knowledge and skill were investigated using an EBP questionnaire returned by 383 nurses. The views of 23 nursing opinion leaders were elicited during qualitative in‐depth interviews, and their ideas on maximising the potential for future nurses to confidently engage in EBP were explored. Current approaches to teaching EBP in undergraduate nursing programs were investigated by examining documents issued by NSW nursing education providers. The results demonstrate many differences between the ways NSW nurses currently understand evidence for EBP, and a range of approaches to teaching EBP in undergraduate nursing programs. Under current conditions, nurses graduating from universities in NSW commence practice with varying levels of preparation for EBP and enter into a professional arena that is itself struggling to cope with the concepts and language of this approach to improving healthcare. v Evidence for the effectiveness of EBP is slowly accumulating and despite some small positive signs, the collective results of this thesis suggest that current educational approaches are not capable of producing the kind of results that are both necessary and desirable for the promotion of evidence‐based nursing practice in NSW. Articulating a commitment to EBP, using a common language and a consistent approach are among the recommendations made for the future promotion of EBP in nursing education.
37
Chen, Liubo. "Concurrent programming : thread-based synchronization versus job-based synchronization /". Search for this dissertation online, 2005. http://wwwlib.umi.com/cr/ksu/main.
Testo completo
38
Ciftci, Gunce. "Shape Analysis Using Contour-based And Region-based Approaches". Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/1092121/index.pdf.
Testo completoAbstract (sommario):
The user of an image database often wishes to retrieve all images similar to the one (s)he already has. In this thesis, shape analysis methods for retrieving shape are investigated. Shape analysis methods can be classified in two groups as contour-based and region-based according to the shape information used. In such a classification, curvature scale space (CSS) representation and angular radial transform (ART) are promising methods for shape similarity retrieval respectively. The CSS representation operates by decomposing the shape contour into convex and concave sections. CSS descriptor is extracted by using the curvature zero-crossings behaviour of the shape boundary while smoothing the boundary with Gaussian filter. The ART descriptor decomposes the shape region into a number of orthogonal 2-D basis functions defined on a unit disk. ART descriptor is extracted using the magnitudes of ART coefficients. These methods are implemented for similarity comparison of binary images and the retrieval performances of descriptors for changing number of sampling points of boundary and order of ART coefficients are investigated. The experiments are done using 1000 images from MPEG7 Core Experiments Shape-1. Results show that for different classes of shape, different descriptors are more successful. When the choice of approach depends on the properties of the query shape, similarity retrieval performance increases.
39
Fidan, Tahir. "Feature Based Design Of Rotational Parts Based On Step". Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605632/index.pdf.
Testo completoAbstract (sommario):
The implicit and low-level part definition data, provided by geometric modeling cannot be used by downstream applications. Therefore, feature based modeling concept has been introduced to integrate CAD and downstream applications. However, due to the lack of implicit and explicit standard representations for features and unmanageable number of possible predefined features without standardization, feature based modeling approach has proved to be inadequate. STEP AP224 provides a standard for both implicit and explicit representations for manufacturing features. This thesis presents STEP AP224 features based modeling for rotational parts. The thesis covers features extracted from STEP AP224 for rotational parts and their definitions, classifications, attributes, generation techniques, attachment methods and geometrical constraints. In this thesis a feature modeler for rotational parts has been developed. STEP AP224 features generated are used as the basic entities for part design. The architecture of the proposed system consists of two three phases: (1) feature library, (2) feature modeler and (3) preprocessor. Preprocessor responsible from STEP-XML data file creation. The data file created can be used in the integration CAPP/CAM systems without using a complex feature recognition process. An object-oriented design approach is used in developing the feature modeler to provide incremental system development and reusability.
40
Hiraishi, Tasuku. "Transformation-based implementation of S-expression based C languages". 京都大学 (Kyoto University), 2008. http://hdl.handle.net/2433/135995.
Testo completo
41
Malsiner-Walli, Gertraud, Sylvia Frühwirth-Schnatter e Bettina Grün. "Model-based clustering based on sparse finite Gaussian mixtures". Springer, 2016. http://dx.doi.org/10.1007/s11222-014-9500-2.
Testo completoAbstract (sommario):
In the framework of Bayesian model-based clustering based on a finite mixture of Gaussian distributions, we present a joint approach to estimate the number of mixture components and identify cluster-relevant variables simultaneously as well as to obtain an identified model. Our approach consists in specifying sparse hierarchical priors on the mixture weights and component means. In a deliberately overfitting mixture model the sparse prior on the weights empties superfluous components during MCMC. A straightforward estimator for the true number of components is given by the most frequent number of non-empty components visited during MCMC sampling. Specifying a shrinkage prior, namely the normal gamma prior, on the component means leads to improved parameter estimates as well as identification of cluster-relevant variables. After estimating the mixture model using MCMC methods based on data augmentation and Gibbs sampling, an identified model is obtained by relabeling the MCMC output in the point process representation of the draws. This is performed using K-centroids cluster analysis based on the Mahalanobis distance. We evaluate our proposed strategy in a simulation setup with artificial data and by applying it to benchmark data sets. (authors' abstract)
42
Deedman, Galvin Charles. "Building rule-based expert systems in case-based law". Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26137.
Testo completoAbstract (sommario):
This thesis demonstrates that it is possible to build rule-based expert systems in case-based law using a deep-structure analysis of the law and commercially available artificial intelligence tools. Nervous shock, an area of the law of negligence, was the domain chosen. The expert whose knowledge was used to build the system was Professor J.C. Smith of the Faculty of Law at the University of British ColumbiaLaw, Peter A. Allard School of
Graduate
43
Khan, Muhammad Qasim, e Zia ur Rehman. "Usability Issues in Content Based Multimedia Computer Based Trainings". Thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3363.
Testo completoAbstract (sommario):
In distance education, students and teachers are at different places and interact with each other with the help of different technologies. Broadcast television, two-way video conferencing, asynchronous learning mode, virtual learning environment (VLE) and content based multimedia computer based trainings (CB-MCBTs) are some of the technologies used to provide distance education. Content Based Multimedia Computer Based Trainings (CB-MCBT) is a computerized learning environment. The acceptance of computerized learning environment is based on its usability. And usability in any computerized learning environment is supportive to learners and it increases their learning experiences of learners. Authors of this research have evaluated usability of CBMCBTs, specifically CB-MCBTs designed by AIOU. Usability evaluation has been performed to find out usability issues in CB-MCBTs, and figured out requirements of learners regarding CB-MCBTs. To figure out usability issues in CBMCBTs authors have used inquiry technique with focus group and questionnaire. Authors have proposed usability criteria to evaluate usability of CB-MCBTs. Each element of proposed criteria is based on principle of user interface design, and three main usability aspects: effectiveness, efficiency, and satisfaction. Development of CB-MCBTs in AIOU is nice and unique effort in the field of computer based trainings. However if these CB-MCBTs are designed to support distance education, then AIOU should focus on the availability of CB-MCBTs to the students, feedbacks within CB-MCBT and feedback from university to students and completeness of these CB-MCBTs regarding features and facilities required by the students. This research also gives recommendation to AIOU for improvements in CB-MCBTs. These recommendations are helpful to fix usability issues in CB-MCBTs and to make these CB-MCBTs according to the requirements of learners.
44
Zhang, Yihui. "DSP-based control strategies for an inverter-based compensator". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0001/MQ41652.pdf.
Testo completo
45
Tang, Hon Cheong 1980. "Gravity-based trust model for web-based social networks". Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112366.
Testo completoAbstract (sommario):
Web-based social networks have become one of the most popular applications on the Internet in recent years. However, most of the social networks rely on some simplistic trust models to manage trust information of the users, which can cause problems ranging from unsatisfied user experience to exposure to malicious users. This thesis proposes a gravity-based trust model to enhance the aggregation of personal trust information into a subjective reputation system. This new model maps all users on the social network into n-dimensional Euclidean spaces based on their direct trust information, and creates a trust social neighborhood for each user. The reputation of a target user is determined by applying gravity model to the information from both target's and observer's trust social neighborhood. A prototype of this trust model is implemented in order to evaluate the effects of varying different parameters of the gravity-based trust model.
46
Pazouki, Maryam. "Stable Bases for Kernel Based Methods". Doctoral thesis, 2012. http://hdl.handle.net/11858/00-1735-0000-0010-D298-8.
Testo completo
47
Lo, Yu-Sheng, e 羅佑昇. "Miniature Vibration-Based Generator with Elastic Base". Thesis, 2008. http://ndltd.ncl.edu.tw/handle/46735482464907531518.
Testo completoAbstract (sommario):
碩士國立交通大學
機械工程系所
96
Nowadays the research on harvesting energy using piezoelectric generators is in great demand. Most research puts emphasis on mechanism design or power generation method, but few on the dynamic properties of piezoelectric benders, e.g.resonant frequency. This work achieves the effect of elastic base by adding springs with prescribed stiffness and a printed circuit board with given mass between piezoelectric benders and bases to make the resonant frequency of piezoelectric benders close to the low frequency of ambient vibration. To look for the elastic base which can make piezoelectric benders generate more electric power, we compare different elastic bases. Accordingly, more electric power is generated from piezoelectric generators using a designed elastic base. We have compared different elastic bases based on power generated by piezoelectric benders. We obtained the best result of 90mV and 396 nW when index a equals 4 and index r equals 2.
48
Chen, Chiau-Yu, e 程巧瑜. "Performance-Based Design of Base-Isolated Buildings". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/ez585h.
Testo completoAbstract (sommario):
碩士國立中興大學
土木工程學系所
106
This study is about using the performance-based design for base-isolated buildings . The study introduces an example isolated building, which is a 15-story reinforced concrete building that was simulated and designed by MIDAS software . First , it set performance targets for the isolated building . The targets include the behavior of the specification , the peak ground acceleration of performance point , and toughness ratio . Second , in the study , the axial forces of column are not the same for each building, so it has to design the isolator according to the axial force of column . Then , I find out the performance point , which is the moment when the isolator is broken, and obtain the seismic base shearing force and ultimate peak ground acceleration . Next , the study decided a combination of isolators to complete the design of the isolation layer . Third , according to the base shear force of upper structure at performance point , it adjusts seismic base shearing force for design . Then , the study decided the reinforcement of structure to complete the design of upper structure . Finally , the study has to check whether the design matches the original targets . The seismic base shearing force for design must to be re-adjusted until it matches the performance targets . As a result , the values of the study are in line with the performance targets , and verify that the design process is feasible . There are three ideas that we can learn from the process of designing isolation building. First , the peak ground acceleration of performance and toughness ratio can be used as the performance targets to design the base-isolated buildings . Second , it is more reasonable and conservative to use the design spectrum ,which is acted by 2500-year regression period seismic force ,to calculate the peak ground acceleration of performance. Third , the seismic base shear for design of specification is so conservative that the yield strength is too high. For reference and comparison of people working in civil engineering industry, this study provides a complete design process with performance-based design for base-isolated buildings .
49
Raza, A. "Capitalizing knowledge using blockchain : multi blockchain based framework for rule- based knowledge base systems (KBS)". Thesis, 2022. https://eprints.utas.edu.au/47549/1/Raza_whole_thesis.pdf.
Testo completoAbstract (sommario):
Traditional Knowledge base systems (KBS) are typically constrained by their ability to acquire new knowledge without the intercession of a technical knowledge engineer. Even though there are several mature, formal methods available for knowledge capture, these techniques are conducted by knowledge engineers. This introduces a fundamental disconnect between the system and domain experts, causing lengthy delays and cogitative disruption for the experts during the attempts to capture their knowledge. Ripple Down Rules (RDR) and Multiple Classification Ripple Down Rules (MCRDR) address this problem as they provide a knowledge acquisition methodology where a domain expert can incrementally provide knowledge to classify case data in the local context in which it occurs. The justification for the classification is only required against cases previously seen by the system, meaning the expert only has to differentiate a case's classification based on what has already been classified. This ripple down methodology allows the knowledge base to be incrementally built and maintained without the need of a knowledge engineer. In contrast with single classifications for a case in RDR, MCRDR provides the potential for multiple classifications thus making MCRDR more suitable for domains where multiple classifications for a case are required. Traditionally, MCRDR KBSs are implemented in a constrained and isolated fashion with the expectation there is only one domain expert to populate the system's rule-base at a given time. Also, the rule-base and associated cornerstone cases that were used in rule formation are themselves stored in traditional databases with centralised access control that are subject to tampering. In addition to security concerns, tampering has the potential to be a contradiction to the fundamental incremental refinement technique MCRDR provides and, in case of large rule-bases, an unauthorised access to tamper any rule without audit-trail would create integrity issues about the inferred knowledge received. These issues are of grave importance when it comes to domains such as medicine where knowledge inferred from rulebased KBS may be critical to health. Similarly, concurrent rule addition from multiple experts may result in rule contradiction thus creating validation issues.
Due to the huge success of bitcoin, Blockchain technology has attained widespread attention in industry, academia and research. It is based on Distributed Ledger Technology (DLT) storing data in the form of transactions which reside in hash-linked blocks. The ledger consistency and user security are maintained by using asymmetric cryptography and distributed consensus algorithms thus making blockchain persistent, auditable, decentralised and anonymous. This makes blockchain suitable to conduct the research associated with rulebased KBS.
To address the shortcomings of tampering, integrity, single point of failure and validation of knowledge in RDR/MCRDR, this research proposes a decentralised framework for capturing, storing and using knowledge in rule-based knowledge base systems and it validates the proposed approach by evaluating an MCRDR-based KBS that is underpinned by blockchain technology and policies. Until now, blockchain has been used mainly for cryptocurrency and assets transfer. This research adapts and leverages blockchain to capitalise knowledge by providing a framework for rule-based knowledge base systems having the features of simultaneous knowledge acquisition, cross-platform (Ethereum and Hyperledger Fabric) communication and code generation by Domain Experts (DE) who do not necessarily have technical expertise. This research defines how these aspects of blockchain are well suited and advantageous when applied to an MCRDR KBS.
This research was conducted in two phases. The first phase proposed a multi-blockchain based framework and methodology for rule-based knowledge base systems to store knowledge in the form of rules in a decentralised manner with role-based access to constrain rule maintenance to domain experts. A prototype system was implemented in Ethereum that leveraged an MCRDR based KBS implementation as it provided multiple classifications and can be readily adopted in different domains. Evaluation results, in terms of blockchain and KBS, showed similar accuracy in terms of the percentage of correct classifications provided when compared to traditional KBS.
The second phase extended the framework by adding a consensus algorithm for concurrent rule addition by multiple domain experts while resolving any contention issues. To make the framework platform-agnostic, this phase also defined and implemented a programming API for double-encrypted cross-platform communication between Ethereum and the Hyperledger Fabric for sharing knowledge in the form of rules. Domain Experts are not necessarily equipped with technical knowledge to create smart contracts in multiple programming languages in standard blockchain and this could create significant hurdles in implementing their policies in the blockchain. Thus, the second phase also provided a modeldriven code conversion module to facilitate DEs to write XML-based contract requirements. These requirements are then converted into technology-specific languages for Ethereum and Hyperledger Fabric, Solidity and Golang respectively, and the results undergo verification before they are added to the blockchain. Each contribution in this phase was evaluated separately; the consensus algorithm was evaluated in Ethereum and Hyperledger Fabric, the API was evaluated with varying workloads for throughput and latency along with the effects of encryption, and the code conversion module was evaluated in terms of time and varying number of lines required in Solidity and Golang.
To the best of knowledge, this is the first study to conduct initial research on a decentralised rule-based knowledge base system (RDR/MCRDR) with simultaneous knowledge acquisition, providing ground work for exploring this area in depth. The significant contributions to the body of knowledge made by this research are:
1- A framework has been proposed for decentralised capturing and maintaining knowledge in rule-based knowledge base systems. An MCRDR based KBS was adopted and evaluated to validate the proposed approach which provided more than 90% of correct classifications showing that knowledge can be captured and maintained in a tamper-proof decentralised way.
2- The definition and hybridisation of blockchain (heterogenous blockchain) based on seven algorithms to capitalise knowledge by storing and retrieving the rules for inference which are linked together but stored in different blocks unlike independent transactions in traditional blockchain based systems.
3- The definition and evaluation of a consensus algorithm for adding simultaneous knowledge in the form of rules by multiple domain experts and to solve any contention between domain experts for adding rules.
4- The definition and evaluation of a double encrypted communication model between Ethereum and Hyperledger Fabric for transfer and sharing of knowledge. Since both platforms have different transaction formats, this communication model proposes a unified transaction format for exchanging data and knowledge between the two platforms.
5- A novel methodology has been defined and evaluated for non-technical domain experts to write their own policies in different blockchain platforms (Ethereum and Hyperledger Fabric).
50
張柳村. "Web based parametric design system dor mold bases". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/61511464314829029952.
Testo completoAbstract (sommario):
碩士國立勤益技術學院
工業工程與管理系
93
With the global market in a severely competitive and ever-changing environment, a firm could maintain its competitive advantage over others by keeping down costs, making better quality and speeding up work flow etc. In the mould industry, a mould designer should joint the supply chain firmly and transmit the related messages to all the points for confirmations quickly by collaboration works. This paper provides for the plastic mould industry an approach for developing a web based parametric design system for mold bases. Unfold the system by using the methodology of IDEF (Integrated CAM DEFinition Modeling); clearly and severely define the complicated system by maps; such that the team workers are finely communicated one another. A three-level web structure of mould base design system is presented for the share institute of knowledge and design information. A friendly interface on web page together with parametric mould parts creation makes easier integration with other production and design systems. This research purposes to provide a feasible solving project for mould manufacturers who ask for fast in every aspect.