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1
Suvannapattana, P. "Analysis and design of user terminal antennas for mobile satellite communications". Thesis, University of Surrey, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326196.
2
Malygin, Andrei. "Adaptive modulation and its control algorithm as a satellite communications fade countermeasure". Thesis, University of Portsmouth, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267230.
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Cummiskey, James C. "Internetworking : the interoperability of commercial mobile computers with the USMC Digital Automated Communications Terminal (DACT) /". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA322501.
Abstract (sommario):
Thesis (M.S. in Computer Science) Naval Postgraduate School, September 1996.Thesis advisor(s): D.P. Brutzman, Lou Stevens. "September 1996." Includes bibliographical references (p. 299-306). Also available online.
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Du, Jinfeng. "Cooperative Strategies in Multi-Terminal Wireless Relay Networks". Doctoral thesis, KTH, Kommunikationsteori, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-103469.
Abstract (sommario):
Smart phones and tablet computers have greatly boosted the demand for services via wireless access points, keeping constant pressure on the network providers to deliver vast amounts of data over the wireless infrastructure. To enlarge coverage and enhance throughput, relaying has been adopted in the new generation of wireless communication systems, such as in the Long-Term Evolution Advanced standard, and will continue to play an important role in the next generation wireless infrastructure. Depending on functionality, relaying can be characterizing into three main categories: amplify-and-forward (AF), compression-and-forward (CF), and decode-and-forward (DF). In this thesis, we investigate different cooperative strategies in wireless networks when relaying is in use. We first investigate the capacity outer and inner bounds for a wireless multicast relay network where two sources, connected by error-free backhaul, multicast to two destinations with the help of a full-duplex relay node. For high-rate backhaul scenarios, we find the exact cut-set bound of the capacity region by extending the proof of the converse for the Gaussian relay channel. For low-rate backhaul scenarios, we present two genie-aided outer bounds by extending the previous proof and introducing two lemmas on conditional (co-)variance. Our inner bounds are derived from various cooperative strategies by combining DF/CF/AF relaying with network coding schemes. We also extend the noisy network coding scheme and the short-message noisy network coding approach to correlated sources. For low-rate backhaul, we propose a new coding scheme, partial-decode-and-forward based linear network coding. We derive the achievable rate regions for these schemes and measure the performance in term of achievable rates over Gaussian channels. By numerical investigation we observe significant gains over benchmark schemes and demonstrate that the gap between upper and lower bounds is in general not large. We also show that for high-rate backhaul, the cut-set bound can be achieved when the signal-to-noise ratios lie in the sphere defined by the source-relay and relay-destination channel gains. For wireless networks with independent noise, we propose a simple framework to get capacity outer and inner bounds based on the ``one-shot'' bounding models. We first extend the models for two-user broadcast channels to many-user scenarios and then establish the gap between upper and lower bounding models. For networks with coupled links, we propose a channel decoupling method which can decompose the network into overlapping multiple-access channels and broadcast channels. We then apply the one-shot models and create an upper bounding network with only bit-pipe connections. When developing the lower bounding network, we propose a two-step update of these models for each coupled broadcast and multiple-access channels. We demonstrate by some examples that the resulting upper bound is in general very good and the gap between the upper and lower bounds is usually not large. For relay-aided downlink scenarios, we propose a cooperation scheme by cancelling interference at the transmitter. It is indeed a symbol-by-symbol approach to one-dimension dirty paper coding (DPC). For finite-alphabet signaling and interference, we derive the optimal (in terms of maximum mutual information) modulator under a given power constraint. A sub-optimal modulator is also proposed by formulating an optimization problem that maximizes the minimum distance of the signal constellation, and this non-convex optimization problem is approximately solved by semi-definite relaxation. Bit-level simulation shows that the optimal and sub-optimal modulators can achieve significant gains over the Tomlinson-Harashima precoder (THP) benchmark and over non-DPC reference schemes, especially when the power of the interference is larger than the power of the noise.QC 20121015
5
Quan, Yibo. "Performance evaluation and resource allocation in millimeter waves device-to-device networks with beamforming". Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAT024.
Abstract (sommario):
La communication de terminal à terminal (D2D) est une technologie clé pour les futursréseaux sans fil. Elle permet aux appareils de communiquer directement, sans avoir besoin d’une infrastructure cellulaire. La communication en ondes millimétriques (mmWave) utilise des fréquences radio de haute fréquence. Elle offre des bandes passantes très larges, ce qui permet des transmissions rapides et fiables. Cependant, les fréquences mm-Wave ont une atténuation élevée, ce qui n´nécessite que les appareils aient plusieurs antennes et utilisent la formation de faisceau. La formation de faisceau nécessite un alignement précis des faisceaux, et les erreurs d’alignement peuvent entraîner une dégradation des performances de transmission. Dans notre ´étude, nous nous concentrons sur l’analysethéorique des performances de la communication D2D en mmW dans le contexte des communications très fiables et à très faible latence, dites URLLC. Nous utilisons la géométrie stochastique et la théorie des files d’attente pour évaluer les variations spatiales ettemporelles des performances selon deux perspectives différentes. D’une part, nous examinons les propriétés moyennes instantanées du réseau aléatoire,et d’autre part, nous étudions les conditions de stabilité d’un réseau dynamique avec des demandes de service aléatoires. Pour les propriétés dynamiques, nous nous concentrons sur la condition de stabilité du réseau D2D en introduisant des réseaux d’antennesdirectionnelles pour les utilisateurs D2D. Le réseau est modélisé sur la base d’un processus spatial de naissance et de mort. Pour les propriétés instantanées, nous nous soucions principalement de la méta-distribution comme une métrique qui tient compte de la distribution spatiale de la probabilité de couverture. Nous dérivons une expression de la méta-distribution du débit effectif comme une garantie de latence statistique pour les communications URLLC, en considérant à la fois les coûts d’apprentissage et le désalignement pour un réseau D2D avec formation de faisceaux. Enfin, nous proposons des méthodes pour choisir le nombre optimal d’antennes et pour allouer des ressources pour la formation des faisceauxDevice-to-Device (D2D) communication is a key technology for future wireless networks, allowingdevices to communicate directly without relying on a cellular infrastructure. Millimeter wave (mm-Wave) communication utilizes high-frequency radio, providing very large bandwidths for fast and reliable D2D transmissions. However, mmWave frequencies have high attenuation, requiring devices to have multiple antennas and perform beamforming. The success of beamforming requires beam training. The beam misalignment can impact the performance of the network. To address these challenges, our study focuses on the theoretical analysis of the performance of mmWave D2D communications within the context of Ultra-Reliable Low Latency Communications(URLLC). We use stochastic geometry and queuing theory to evaluate both spatial and temporalvariations in performance from two different perspectives: the instantaneous average properties of the random network and the global stability properties of a dynamic network with random service requests. For the dynamic properties, we focus on the stability condition of D2D network by introducing directional antennas arrays for the D2D users. The network is modeled based on a spatial birth-death process. For the instantaneous properties, we mainly care about the meta-distribution of the network, which is a metric that accounts for the spatial distribution of coverageprobability. We derive the meta-distribution of the effective rate as a statistical latency guarantee for URLLC communications, by considering both the training overhead and misalignment for a D2D network with beamforming. At last, we propose methods to choose the optimal number of antennas and to allocate resource for beam training
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Andrade, Cristiani Garrido de. "Cuidados paliativos: comunicação entre enfermeiro e paciente terminal". Universidade Federal da Paraíba, 2013. http://tede.biblioteca.ufpb.br:8080/handle/tede/5124.
Abstract (sommario):
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Previous issue date: 2013-03-26Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
INTRODUCTION: The palliative care comprehends a holistic approach of assistance for patients without cure possibilities and their families, in order to provide them a better quality of life. Its application is greatly relevant, in the ambit of care directed to terminal patient. OBJECTIVES: This is study aims to investigate the comprehension of assistance nurses regarding palliative care; to identify the strategies that nurses use to promote palliative care for terminal patient; to ascertain how nurses utilize communication, in the ambit of palliative care, when assisting the patient in terminal phase, to investigate how nurses use the communication to broach the bad news for patient in terminal phase and their family in the practice of palliative care. METHODOLOGY: This is an exploratory research of qualitative nature in which the investigate scenario was a public health institution, located in the city of João Pessoa PB; participated in the research twenty eight assistance nurses. For data collection, that occurred between August and October 2012, was utilized a form containing pertinent question to the proposed objectives for the research. As registry unit for the analysis of empirical material, it was chosen the thematic content analysis, from the following phase: pre-analysis, material exploration and treatment of results, inference and interpretation. The data obtained by means of discourse expressed by the participants of the investigation were grouped in the following thematic categories: Palliative care: conceptual aspects and care strategies with the patient in terminal phase, with their respective subcategories: Palliative care promotion of life quality for patients without possibilities of cure; strategies utilized for the promotion of palliative care directed for the patient in terminal phase and Palliative care and Communication, with the subcategories: Palliative care and communication interpersonal relation of the nurse with the terminal patient, communication of difficult news support for patients and families under palliative care. RESULTS: The research included from the vision of the involved professionals, the valuation of palliative care considered as a modality of care which aims to minimize the suffering of the patient without therapeutic possibilities of cure/terminal and of their family, by means of an assistance guided by humanization. Results evidenced that nurses utilize useful and appropriate strategies that meet the needs of patients and their families, in the context of the addressed care all over its dimension, with emphasis on verbal and nonverbal communication, as essential part of care with the patient and the family. FINAL CONSIDERATIONS: We consider that this study opens a new horizon, in the field of care, of teaching and learning in Nursing, with emphasis in the importance of palliative care and of the communication with the patient in terminal phase. Because of the reduced quantum, of studies directed to this thematic, in the ambit of national literature, it is hoped that this research can subsidize new investigation that contemplate the interrelation of Palliative care with the communication.
INTRODUÇÃO: Os cuidados paliativos compreendem uma abordagem holística de assistência ao paciente sem possibilidades de cura e seus familiares, com a finalidade de proporcionar-lhes uma qualidade de vida melhor. Sua aplicação é sobremaneira relevante, no âmbito do cuidado dispensado ao paciente em fase terminal. OBJETIVOS: este estudo objetiva investigar a compreensão de enfermeiros assistenciais no que concerne aos cuidados paliativos; identificar as estratégias que os enfermeiros adotam para promover os cuidados paliativos direcionados ao paciente em fase terminal; averiguar como os enfermeiros utilizam a comunicação, no âmbito dos cuidados paliativos, ao assistir o paciente em fase terminal; investigar como os enfermeiros empregam a comunicação para abordar as más-notícias ao paciente em fase terminal e a sua família na prática dos cuidados paliativos. METODOLOGIA: Trata-se de uma pesquisa exploratória de natureza qualitativa, cujo cenário da investigação foi uma instituição pública de saúde, localizada no município de João Pessoa PB; participaram do trabalho vinte e oito enfermeiros assistenciais. Para a coleta dos dados, que ocorreu entre agosto e outubro de 2012, utilizou-se um formulário contendo perguntas pertinentes aos objetivos propostos para a pesquisa. Como unidade de registro para analisar o material empírico, optou-se pela análise de conteúdo temática, a partir das seguintes fases: pré-análise, exploração do material e tratamento dos resultados, inferência e interpretação. Os dados obtidos por meio dos discursos expressos pelos participantes da investigação foram agrupados nas seguintes categorias temáticas: Cuidados paliativos: aspectos conceituais e estratégias de cuidados com o paciente em fase terminal, com suas respectivas subcategorias: Cuidados paliativos promoção de qualidade de vida para pacientes sem possibilidades de cura; estratégias utilizadas para a promoção de cuidados paliativos direcionados ao paciente em fase terminal e Cuidados paliativos e comunicação, com as subcategorias: Cuidados paliativos e comunicação relação interpessoal do enfermeiro com o paciente terminal; comunicação de notícias difíceis suporte para os pacientes e familiares sob cuidados paliativos. RESULTADOS: A pesquisa contemplou, a partir da visão dos profissionais envolvidos, a valoração dos cuidados paliativos considerados como uma modalidade de cuidar que visa minimizar o sofrimento do paciente sem possibilidades terapêuticas de cura/terminal e de sua família, por meio uma assistência pautada na humanização. Os resultados evidenciaram também que os enfermeiros empregam estratégias úteis e apropriadas e atendem às necessidades dos pacientes e de seus familiares, no contexto dos cuidados abordados em toda a sua dimensão, com destaque para a comunicação verbal e a não verbal, como parte essencial do cuidado com o paciente terminal e sua família. CONSIDERAÇÕES FINAIS: Consideramos que este estudo abre novos horizontes, no campo da assistência, do ensino e da pesquisa em Enfermagem, com ênfase na importância dos cuidados paliativos e da comunicação com o paciente em fase terminal. Devido ao quântico reduzido de estudos direcionados a essa temática, no âmbito da literatura nacional, espera-se que a pesquisa possa subsidiar novas investigações que contemplem a inter-relação dos Cuidados paliativos com a comunicação.
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Lu, Chen. "Improving communication with terminally Ill patients in the end-of-life care: a volunteers' perspective". HKBU Institutional Repository, 2014. https://repository.hkbu.edu.hk/etd_oa/122.
Abstract (sommario):
Communication is an important component in care for the patients. As human beings, we are all mortal, thus, communication at the end of life is a topic that is significant for all of us. Research on communication with dying patients who suffered from incurable illness is relatively insufficient in China given the fact that palliative care originated in the West. Moreover, previous research focused more on the communication between patients and medical staff who shoulder the majority work for taking care of the patients. There is relatively little research looking into volunteers' experience in communicating with dying patients. Communicating with dying patients is the experience that can cause anxiety and stress. As patients with advanced and incurable cancers have exhausted their social contacts due to the prolonged illnesses and people's general anxiety to communicate with dying people, their shrinking social contacts will result in isolation, which will trigger emotional pain in addition to the physical pain. Volunteers come to assist in caring for them as a form of social support for the dying people, and their communication experience is valuable for any caregivers of dying patients. The researcher of the study directly engaged with the activities of a group of volunteers in Shenzhen for six months, doing ethnography and semi- structured interviews, so as to understand the practices and meanings of volunteers' communication with dying patients. The results showed that three main dimensions emerged, namely, isolation and connection, dependence and autonomy, discontinuity and continuity. Volunteers adopted various communication skills so as to make patients feel that they are still connected to others, enjoy certain degree of autonomy over their body like the healthy people and let them move on in the last phase of their life. They also suggest that there should be more investigations in the end-of-life communication
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Dunbar, Pervell Velethia. "Nursing Care of Terminal patients in Intensive Care Units". ScholarWorks, 2015. https://scholarworks.waldenu.edu/dissertations/1379.
Abstract (sommario):
Nursing Care for Terminal Patients in Intensive Care Units
by
Pervell Dunbar
Project Submitted in Partial Fulfillment
of the Requirements for the Degree of
Doctor of Nursing Practice
Walden University
August 2015
Although the goal of the ICU has always been to save lives, ICU now additionally provides end-of life (EOL) care. The objective of this project was to provide ICU nurses with a comprehensive awareness of physical, emotional, and spiritual EOL care issues of patients and their families in order to be better equipped to handle EOL care. The framework used was Jean Watson's Caring model (10 Caritas). A literature review revealed a poster previously used by a major health organization as a conversation starter to facilitate decision-making among ICU nurses, EOL patients, and their families related to EOL issues. The purpose of this quality improvement initiative was to introduce and implement an educational EOL tool that would engage patients and family members in meaningful and useful conversations with ICU nurses. Twenty seven ICU nurses were selected by the unit's director to attend a PowerPoint presentation on the use of the EOL educational poster. Four ICU nurses were chosen by the director to be champions for this project. After the presentation, there was a period for questions and answers, and the ICU nurses were requested to give feedback on the presentation. The result from the feedback revealed that EOL care is outside previous practice and may require extra education and support. These comments substantiated similar conclusions from other researchers as described in this paper. With an increase in EOL training for ICU nurses and the implementation of EOL teaching tools like the poster used in this study, ICU nurses may be better able to have conversations with EOL patients and families, thus improving patient care.
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Wang, Feng. "Energy Efficient Digital Baseband Modulator for Cable Terminal Systems Targeted on Field Programmable Gate Array". Ohio University / OhioLINK, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1091114767.
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Enea, Gabriele. "Simulation-Based Study to Quantify Data-Communication Benefits in Congested Airport Terminal Area". Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/31206.
Abstract (sommario):
The scope of this study was to evaluate the impact of the air traffic controller-to-pilot communication standard known as CPDLC or Data-Communication on the future air traffic operations. The impact was evaluated from the double viewpoint of airport delays and air traffic controllersâ workload. RAMS simulation software is used to perform all the runs and from its output data the values of terminal area delays and controllers workload are obtained. The New York Metroplex terminal area was used as a case study. Because of its complexity, where three major airports (i.e. JFK, Newark, and La Guardia) interact and constraint each other, this area was particularly interesting to be studied and the data analyzed gave a valuable insight on the possible future impact of Data-Communication in congested terminal areas. The results of the study, based on some previous man-in-the-loop simulations performed by the FAA in the nineties, showed that significant potential benefits could be obtained with the complete implementation of such technologies in the workload experienced by air traffic controllers. Moreover some small but not negligible benefits were obtained in the total delays accrued by each airport studied. On the other hand, the simulations of the future demand predicted by the FAA demonstrated that without a significant increment in capacity or limitation on the traffic growth intolerable delays would be recorded across the NAS in the future. For the complexity of the simulation model calibration and for the very time-consuming run time not all the scenarios described in the methodology were tested, demonstrating the weakness of RAMS as a ground simulation model.Master of Science
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Lord, Isabelle. "La communication sociale en situation de controverse : le cas du terminal méthanier Rabaska". Thèse, Université du Québec à Trois-Rivières, 2011. http://depot-e.uqtr.ca/2702/1/030295678.pdf.
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Van, der Walt Tjaart. "The management and implementation of a data terminal project on a global system for mobile communications / Tjaart van der Walt". Thesis, Potchefstroom University for Christian Higher Education, 1999. http://hdl.handle.net/10394/9613.
Abstract (sommario):
With the demand for more control over remote systems and access to remote data increasing, there
existed the need for a more efficient and low cost means of transmitting this data. Traditionally, small
telemetry data packets have been transmitted using unreliable direct radio frequency links, or expensive
copper connections or satellite communications. With the international infrastructure of the Global System
for Mobile communication (GSM) networks and it's ever-improving coverage, GSM has become a viable
solution as the data channel for data telemetry. With a data terminal, remote monitoring of processes in a
factory plant with real-time access to the parameters will be possible. If the per-unit cost is low enough,
there would be a use for it in pre-paid energy metering, or even in the control of peak energy demand.
The goal of this project was twofold: firstly to apply a structured project management approach to the
design cycle of a data terminal, and secondly to design such a terminal in the shortest possible time. It
was anticipated that the use of a structured management process would reduce the development time.
The data terminal was not designed for a specific customer, but was to be as versatile and flexible as
possible. It is understood that only a percentage of all telemetry applications will be able to use such a
device, and the trade-off was to balance the cost of the unit (and functionality) with too much complexity.
The project was completed in a relatively short time, and the terminal found to be extremely flexible. The
unit cost was kept low as compared to other systems. In fact, the complete unit will cost the end user less
than just the communication devices in the trunk radio and satellite systems it can replace.
The short message service (SMS) as a communication channel has proven itself to be more reliable and
of lower cost than other competing technologies. The ongoing expansion and improvement of the GSM
networks by their operators, also ensure a stable platform for future use of the data terminal.Thesis (MIng (Electrical Engineering))--PU for CHE, 1999
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Chandran, Henry. "AN ADVANCED RECONFIGURABLE MULTI-CHANNEL COMMUNICATION TERMINAL FOR TELEMETRY APPLICATIONS BASED ON FLEXICOM 260A". International Foundation for Telemetering, 2001. http://hdl.handle.net/10150/606400.
Abstract (sommario):
International Telemetering Conference Proceedings / October 22-25, 2001 / Riviera Hotel and Convention Center, Las Vegas, NevadaTraditional communication hardware has focused on modular architectures. Now, with the incoming high speed DSP and FPGAs a shift from traditional modular architecture to reconfigurable architecture has taken place. The nature of this architecture allows to optimize various telemetry applications in a single platform. This paper describes a reconfigurable multi channel communication system.
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Fearnley, Rachel F. "A lonely place to be : children's experiences of living with a parent who is dying". Thesis, University of Derby, 2010. http://hdl.handle.net/10545/231352.
Abstract (sommario):
The following research has explored children's experiences when living with a parent who is dying. The findings provide substantial evidence that these children frequently experience a conspiracy of silence which is orchestrated and managed by the adults in their lives. The findings have evidenced that children are not typically included in information exchanges about their parents' illnesses. This creates feelings of powerlessness and a barrier to `making meaning' of their current experiences. Exclusion from appropriate and meaningful discourses results in them being unable to develop narratives that are consistent with the peripheral information they are receiving, and which cause them to question their identity and the construct of their family. However, the research has also shown that when children are included in conversations about their parents' illnesses, they generally have a more sophisticated understanding of what is happening and are cognitively and emotionally better able to cope. The quality and quantity of information that is shared with children of terminally ill parents affects their ability to assimilate what is happening which in turn impacts on their management of, or in many examples, their failure to manage the situation. This thesis explores strategies employed by children in their attempt to begin to make meaning from what is happening and to manage the situation. The research highlights that these children experience a number of transitions, changes and challenges. Changes in family routines and the shift from the known patterns of family life to a chaotic and unsafe world often present these children with unprecedented challenges that can severely affect how they manage the experience and how they begin to make meaning from what is happening. Within the thesis I argue that children experience a form of `social death' where previously known social activities and contacts are curtailed because of parents' illnesses. The concept of `social death' reflects their increasing isolation from a `normal' social world which intensifies feelings of difference and causes further questions about identityThe thesis builds on the work of Walter (1996) suggesting that not only is there a `last chapter' to be written following the death, but that children with terminally ill parents are also critically involved in writing a `penultimate chapter' during the latter phases of their parents' illnesses. This `chapter' forms the narratives that accompany this challenging and rapidly changing time in the children's lives. The `writing' of the chapter provides, in part, a framework for the children to construct their biography and consequently develop an understanding of what is happening. However, when they are not included in conversations about the illness the `writing' of the chapter can be severely compromised thus causing them to write an inaccurate account and create incongruent narratives
15
Kline, Seth A. "The Perceived Relevance of Training in Industrial/Organizational Psychology at the Terminal Master's Level". TopSCHOLAR®, 2014. http://digitalcommons.wku.edu/theses/1369.
Abstract (sommario):
The purpose of this study was to replicate and expand upon the survey research by Erffmeyer and Mendel (1990) on the perceived relevance of graduate training in industrial-organizational (I-O) psychology at the terminal master’s level. A review of the literature discussed core competencies, as well as the advantages of internship experiences and thesis requirements. Results indicated that graduates view their training as well targeted towards knowledge and skills they regard as useful at their internship, first job, and current position. Results also indicated that graduates viewed their internship experiences as highly beneficial and worthwhile experiences, regardless of their supervisor. Results additionally indicated that graduates value the thesis requirement significantly more than current students and view the knowledge, skills, and abilities associated with completing a thesis as high in usefulness. Implications and limitations of these findings are discussed, and directions for future research on master’s level I-O training are discussed.
16
Psillas, Christopher F. "A preliminary economic evaluation of Marine Corps acquisition practices: UHF satellite communication ground terminal acquisitions". Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/27220.
Abstract (sommario):
Economic theories and concepts are used to discuss allocating scarce fiscal resources for acquiring UHF satellite communication ground terminals. This thesis provides and overview of current acquisition practices and suggests how applied economics can explicitly aid in better decision making. Keywords: Command control and communications, Telecommunications, Demand, Supply, Acquisitions, Demand management. (KR)
17
Ahmadipour, Mehrasa. "An Information-theoretic approach to integrated sensing and communication". Electronic Thesis or Diss., Institut polytechnique de Paris, 2022. http://www.theses.fr/2022IPPAT041.
Abstract (sommario):
Les réseaux sans fil de la prochaine génération devraient prendre en charge les techniques de détection. Des exemples importants sont les systèmes de transport intelligents, où les véhicules détectent en permanence les changements environnementaux et échangent des informations avec les véhicules ou les serveurs centraux. Il existe des solutions naïves pour réaliser ces deux tâches, qui proposent de partager les ressources entre les deux. Cependant, les coûts élevés de spectre et de matériel de ces approches encouragent l’intégration des tâches de détection et de communication (ISAC) via une seule forme d’onde et une seule plateforme matérielle. Cette thèse se concentre sur l’ISAC théorique de l’information. Nous examinons le premier modèle informationnel théorique pour ISAC dans [1] où un canal sans mémoire dépendant de l’état (SDMC) avec des signaux de rétroaction généralisés est observé au niveau de l’émetteur (Tx). Notre première contribution est de caractériser le compromis fondamental entre les taux de communication et la distorsion de détection des canaux de diffusion (BC) dépendants de l’état, mono-Tx et bi-Rx, qui sont physiquement dégradés. Nous fournissons également des limites intérieures et extérieures sur les compromis taux-distorsion réalisables pour les canaux de diffusion généraux. La stratégie optimale de détection des Tx uniques est un simple estimateur symbole par symbole et l’optimalité de cet estimateur découle du fait que les canaux de rétroaction généralisés et la séquence d’état sont tous deux sans mémoire. Ce n’est pas nécessairement le cas dans les configurations avec plus d’une Tx. Plus précisément, pour le MAC, nous proposons une détection collaborative où chaque Tx compresse d’abord les sorties et les entrées obtenues pour extraire les informations d’état, puis transmet l’indice de compression à l’aide d’un code de canal pur aux autres Tx. Nous décrivons également deux schémas ISAC collaboratifs pour D2D, basés sur la séparation source-canal/le schéma de canal bidirectionnel de Han et basés sur le codage conjoint source-canal (JSCC). Dans le scénario MAC et D2D, nos schémas ISAC sont strictement concaves dans les paires taux-distorsion et améliorent donc également les stratégies classiques de partage du temps ou des ressourcesNext-generation wireless networks are expected to support sensing techniques. Important examples are intelligent transport systems, where vehicles continuously sense environmental changes and exchange information with vehicles or central servers. There are some naive solutions to do both tasks which propose to share the resources between the two. But, the high spectrum and hardware costs of these approaches encourage to integrate the sensing and communication (ISAC) tasks via a single waveform and a single hardware platform. This thesis focuses on information-theoretic ISAC. We review the first information-theoretic model for ISAC in [1] where a statedependent memoryless channel (SDMC) with generalized feedback signals observed at the transmitter (Tx). Our first contribution is to characterize the fundamental tradeoff between communication rates and sensing distortion of statedependent single-Tx two-Rx broadcast channels (BC) that are physically degraded. We also provide inner and outer bounds on the achievable rate-distortion tradeoffs for general BCs. The single-Txs’ optimal sensing strategy is a simple symbol-by-symbol estimator and the optimality of this estimator stems from the fact that the generalized feedback channels and the state-sequence both are memoryless. This is not necessarily the case in setups with more than one Tx. Specifically, for the MAC, we propose collaborative sensing where each Tx first compresses the obtained outputs and inputs to extract state information, then transmits the compression index using a pure channel code to the other Tx. Also, we describe two collaborative ISAC schemes for D2D, based on source-channel separation/Han’s two-way channel scheme and based on joint source-channel coding (JSCC). In both the MAC and the D2D scenario, our ISAC schemes are strictly concave in the rate-distortion pairs and thus also improve over classical time- or resource-sharing strategies
18
Camboulives, Adrien-Richard. "Compensation des effets de la turbulence atmosphérique sur un lien optique montant sol-satellite géostationnaire : impact sur l'architecture du terminal sol". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS564/document.
Abstract (sommario):
Un lien optique basé sur un multiplex de longueurs d'onde autour de 1,55μm est une alternative intéressante pour pallier la saturation des bandes radio-fréquences classiquement utilisées et pour répondre aux besoins de liens haut débit par satellite géostationnaire de la prochaine génération de télécommunication. Compte-tenu de la puissance limitée des lasers envisagés, la divergence du faisceau doit être considérablement réduite. Par conséquent, le pointage du faisceau devient un paramètre critique. Au cours de sa propagation entre la station sol et un satellite géostationnaire, le faisceau optique est dévié et éventuellement déformé par la turbulence atmosphérique. Cela induit de fortes fluctuations du signal de télécommunication détecté, réduisant le débit disponible. Un miroir de basculement est utilisé pour pré-compenser la déviation mesurée à partir d'un faisceau provenant du satellite. Du fait de l'angle de pointage en avant entre la liaison descendante et la liaison montante, les effets de turbulence subis par les deux faisceaux sont légèrement différents, ce qui induit une erreur dans la correction.Le critère de performance de la liaison est l’intensité minimale détectable 95% du temps. Un modèle rapide, nommé WPLOT, prenant en compte les erreurs de pointage et leur évolution temporelle, est proposé pour évaluer cette intensité minimale en fonction des paramètres de la station sol et de la qualité de la correction. Les résultats obtenus avec ce modèle sont comparés avec ceux obtenus par un modèle physique mais plus couteux en temps de calcul ; le code TURANDOT. Grâce à ce modèle, une étude de sensibilité a été réalisée et a permis de proposer un dimensionnement de la station sol. Ce modèle permet également de générer des séries temporelles afin d’optimiser les codes de correction d’erreur et optimiser le débit (1Terabit/s d'ici 2025)An optical link based on a multiplex of wavelengths at 1.55µm is foreseen to be a valuable alternative to the conventional radio-frequencies for the feeder link of the next-generation of high throughput geostationary satellite. Considering the limited power of lasers envisioned for feeder links, the beam divergence has to be dramatically reduced. Consequently, the beam pointing becomes a key issue. During its propagation between the ground station and a geostationary satellite, the optical beam is deflected and possibly distorted by atmospheric turbulence. It induces strong fluctuations of the detected telecom signal, thus reducing the capacity. A steering mirror using a measurement from a beam coming from the satellite is used to pre-compensate the deflection. Because of the point-ahead angle between the downlink and the uplink, the turbulence effects experienced by both beams are slightly different, inducing an error in the correction. The performance criteria is the minimum detectable irradiance 95% of the time. A fast model, named WPLOT, taking into account pointing errors and their temporal evolution, is proposed to evaluate the minimum irradiance as a function of the ground station parameters and quality of the correction. The model’s results are compared to those obtained with a more physical but requiring more computation power: TURANDOT. A sensitivity study has been realized and led to a sizing of a ground station. The model also enables the generation of time series in order to optimize the forward error correction codes in order to be compliant with the targeted capacity (1Terabit/s by 2025)
19
Housewright, Richard W. "The Tri-band Satellite Terminal : a case study in accelerated acquisition and program management of Army communication systems /". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA325567.
Abstract (sommario):
Thesis (M.S. in Management) Naval Postgraduate School, December 1996.Thesis advisor(s): Keith F. Snider, Sandra M. Desbrow. "December 1996." Includes bibliographical references (p. 97-99). Also available online.
20
Hsieh, Hsiu-Fang. "Deductive content analysis of end-of-life decision-making in the ICU /". Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/7191.
21
Harrell, Steven B. "Design of a Super High Frequency (SHF) Extremely High Frequency (EHF) Satellite Communications (SATCOM) Terminal (SEST) for New Construction Naval Surface Ships using the systems engineering process". Master's thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-02162010-020314/.
22
Araujo, Monica Martins Trovo de. "Quando \"uma palavra de carinho conforta mais que um medicamento\": necessidades e expectativas de pacientes sob cuidados paliativos". Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/7/7139/tde-02102006-144115/.
Abstract (sommario):
Este estudo objetivou conhecer as expectativas do paciente fora de possibilidades terapêuticas e sob cuidados paliativos com relação à assistência de enfermagem durante o processo de morrer, assim como identificar as necessidades destes pacientes relacionadas à comunicação com a equipe de enfermagem. Os dados foram coletados no primeiro semestre de 2005, por meio de entrevistas semi-estruturadas com questões norteadoras, junto a trinta e nove pacientes oncológicos sem prognóstico de cura, com limitação na capacidade de realizar atividades e submetidos à quimioterapia paliativa em uma instituição hospitalar da cidade de São Paulo. Após transcrição fiel das falas, os dados foram analisados segundo a metodologia de análise do conteúdo. Dos discursos dos entrevistados emergiram seis categorias, que evidenciaram o sofrimento multidimensional do câncer e seu tratamento, o fato de que apesar do sofrimento, a vida continua; a espiritualidade e a família enquanto fontes de apoio e estímulo para o enfrentamento da doença oncológica avançada. Revelam ainda a assistência de enfermagem desejada e o papel de destaque que representam a comunicação e o relacionamento interpessoal para quem enfrenta o processo de morrer. Concluiu-se que os pacientes entrevistados resgataram o valor da relação humana baseada na empatia e compaixão como base para o cuidado que esperam, desejando do profissional de enfermagem habilidade técnico-científica para a realização de ações que aliviam o sofrimento, especialmente o adequado controle da dor, comportamento empático e compassivo, informação e suporte emocional. A comunicação interpessoal comprovou ser importante atributo do cuidado paliativo à medida que o valor atribuído à mesma sobressaiu-se dos discursos, evidenciando a atenção dada aos sinais nãoverbais do profissional para o estabelecimento do vínculo de confiança, a necessidade da presença compassiva, o desejo de não focar a interação e o relacionamento apenas na doença e morte e a valorização da comunicação verbal alegre, que privilegia o otimismo e o bom humor.The objective of this study was to know the expectations of the patients who have no therapeutic possibilities and who are under palliative care regarding nursing assistance during the dying process, as well as to identify these patients needs related to communication with the nursing team. The data were collected during the first semester of 2005, through half-structured interviews with guided questions, among 39 oncologic patients without healing prognosis, having a limited capacity to perform activities and subjected to palliative chemotherapy in a hospital institution of the city of São Paulo, Brazil. After loyal transcription of the speeches, the data were analyzed according to the methodology of content analysis. From the interviewee speeches six categories emerged that proved the multidimensional suffering of cancer and its treatment, the fact that regardless of the suffering, life goes on; that spirituality and the family while acting as sources of support provide stimulation for confronting an advanced oncologic disease. The interviewees also revealed the nursing assistance which they desire and the role of note which represented the communication and interpersonal relationship for those who face the dying process. Therefore, it can be concluded that the interviewed patients redeemed the value of human relationships based on empathy and compassion as basis for the care they expect, desiring from the nursing professional a technical-scientific ability to perform actions necessary to relieve the suffering, especially an adequate control of pain, empathy and compassionate behavior, well informed and emotionally supportive. Interpersonal communication proved to be an important attribution to palliative care as long as its value has been prominent in the speeches, paying particular attention to the non-verbal signs of the professional for establishing a link of trust, the necessity of compassionate presence, the desire of not focusing the interaction and the relationship only on the disease and death and in its place concentrating on a cheerful verbal communication favoring optimism and good humor.
23
Price, Lauren. "Assessing and Communicating Hospice Referral Need: A Proposed Web-Based Educational Module for Nurses Caring for Terminal Oncology Patients". Thesis, The University of Arizona, 2011. http://hdl.handle.net/10150/144936.
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Bories, Serge. "Conception et analyse des performances d'antennes pour les communications ultra large bande". Phd thesis, Paris 11, 2006. http://pastel.archives-ouvertes.fr/pastel-00002430.
Abstract (sommario):
Le marché des radiocommunications de proximité évolue entre autres vers des applications soit à très basse consommation, soit à très haut débit. Bénéficiant d'une largeur de bande instantanée au moins cent fois plus grande que celle des systèmes large bande actuels, la technologie ultra large bande (ULB) se positionne naturellement sur ces deux créneaux. L'objectif de cette thèse est d'améliorer la compréhension et la performance des antennes ULB fonctionnant sur plusieurs gigahertz tout en répondant aux contraintes spécifiques des applications grand public. Dans un premier temps, la réduction de l'encombrement et du coût des antennes est le point de mire du travail de conception. Cependant ces réductions vont en général de pair avec une dégradation des performances qu'il faut pouvoir quantifier. Pour caractériser la performance de l'antenne sur une telle bande, les outils usuels (gain, phase) dans le domaine fréquentiel sont peu adaptés. Particulièrement pertinent pour le mode impulsionnel, des descripteurs temporels sont donc introduits. Entre autres, la distorsion de la forme d'onde rayonnée par l'antenne est étudiée. Elle permet d'analyser et de quantifier l'influence sur la qualité de la liaison, d'un comportement d'antenne variant en fonction de la fréquence. Dans un second temps, la distorsion qu'apporte l'antenne est mise en regard de celle apportée par les autres éléments de la chaîne de communication. Des campagnes de mesures du canal de propagation et de l'impact de l'intégration sur un terminal multimédia ont été réalisées.
25
Chan, Anthony Siu Lung. "Activation of c-jun N-terminal kinase by G protein-coupled receptors and the cross-communication with epidermal growth factor signaling /". View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?BICH%202002%20CHAN.
Abstract (sommario):
Thesis (Ph. D.)--Hong Kong University of Science and Technology, 2002.Includes bibliographical references (leaves 201-236). Also available in electronic version. Access restricted to campus users.
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Terrien, Jill M. "Communication with Healthcare Providers at End of Life: The Perspective of Decedents' Next of Kin: A Dissertation". eScholarship@UMMS, 2007. https://escholarship.umassmed.edu/gsn_diss/1.
Abstract (sommario):
Communication with healthcare providers (HCP’s) at the end-of-life (EOL) is a crucial process that can make a difference in the quality of the EOL experience for patients and their families. Targeting EOL communication interventions between patients, their families, and HCP’s is better informed from an understanding of what family members perceive as good and bad communication. The purpose of this study was to explore experiences related to communication with HCP’s in central Massachusetts during EOL care.
Data from the parent study (n = 373) included responses from an open ended question at the end of the survey. The larger, qualitative descriptive study, from the parent study, (n = 218 ) that examined the open ended question revealed communication as the overarching theme. A secondary analysis of this open ended survey data using qualitative content analysis was used to describe next of kin’s perspectives of communication with HCP’s during the decedents’ end-of-life experience (n = 171).
Family members (children = 38.4% and spouse = 22.0%) comprised the majority of the sample. Decedents were mostly 80 or older (47.6%), died in an acute care setting of mostly cancer (33.0 %) and cardiovascular disease (32.3%).
Accessing information, emerged as the overarching theme. Continuum of information, healthcare provider sensitivity, having the answers and raising awarenesswere revealed as subthemes. The majority of respondents reported good aspects versus bad aspects of communication at the EOL. The framework for a good death (Emanuel & Emanuel (1998) under-girded the study but was not supported as it relates to these findings. The framework was useful in capturing the multidimensional process that each patient and their family could experience during the EOL process.
The findings from this study provide insight for HCP’s about which aspects of communication are helpful at the EOL. Continuing education of the health care team on these identified helpful communication aspects will provide better access for patients and families for a quality EOL experience.
27
Kabore, Wendpanga Rodrigue. "Usages agricoles des terminaux mobiles au Burkina Faso". Thesis, Bordeaux 3, 2018. http://www.theses.fr/2018BOR30064/document.
Abstract (sommario):
La croissance de la téléphonie mobile en Afrique a surpassé les prévisions les plus optimistes des opérateurs. De nos jours l’intérêt et l’utilité du téléphone sont clairement démontrés par les pratiques et ce pour tous les usagers quel que soit le niveau social ou géographique. Très adapté dans plusieurs domaines, tels le commerce, la santé, l’éducation, l’élevage et l’agriculture, il n’est pas utilisé de la même manière dans différents milieux tels les zones rurales, périurbaines, ou urbaines : ou dans les pays émergents et ceux en développement. Les uns utilisent des applications, les autres juste pour des appels, ainsi l’outil n’est pas le même partout. L’agriculture est une des activités pratiquées par plus de 80% de la population active au Burkina, avec des producteurs commerçants dans les zones urbaines et périurbaines qui pratiquent la maraicher-culture et des ruraux qui sont plus axés dans les productions saisonnières et fruitières. Dans l’optique d’accroitre sa production agricole, en miroir des grandes puissances, le Burkina Faso reste sur une lancée d’appropriation des technologies mobiles dans la production agricole. Malgré l’influence des facteurs d’ordre technique (la fracture numérique), politique, social (analphabétisme, illettrisme, pauvreté) et culturel, l’usage du téléphone mobile s’est développé si rapidement, et cela parce qu’il n’est plus l’apanage des seuls nantis. Son appropriation par les petits artisans, commerçants du secteur de l’économie et les agriculteurs a pris de l’ampleur adopté parce qu’ils ont compris l’intérêt du système d’abonnement par des cartes prépayés ou post payés à des coûts très accessibles, aux facilités multiples aussi qu’offre le téléphone portable. L’usage du téléphone mobile reste particulier car il est plus adopté par la population à faible revenus afin de réduire leurs dépenses, donc faire des économies. Dans le sens de toujours contribuer à l’expansion de l’adoption des technologies de l’information et de la communication (le téléphone portable y compris) des efforts sont effectués par les institutions privées et publiques, nationales et internationales pour favoriser leur accès et leur utilisationThe growth of mobile telephony in Africa has surpassed the most optimistic forecasts of the operators. Nowadays the interest and the usefulness of the telephone are clearly demonstrated by the practices and this for all the users whatever the social or geographical level. It is highly adapted in several fields, such as trade, health, education, livestock and agriculture, and is not used in the same way in different environments such as rural, peri-urban or urban areas: emerging and developing countries. Some use applications, others just for calls, so the tool is not the same everywhere. Agriculture is one of the activities practiced by more than 80% of the working population in Burkina, with commercial producers in urban and peri-urban areas practicing market gardening and rural people who are more focused on seasonal and fruit production. In order to increase its agricultural production, mirroring the great powers, Burkina Faso is still on a roll of appropriation of mobile technologies in agricultural production. Despite the influence of technical factors (the digital divide), political, social (illiteracy, poverty) and cultural, the use of the mobile phone has developed so quickly, and this because it does not is more the prerogative of the only haves. Its appropriation by small artisans, traders in the economy sector and farmers has gained momentum because they have understood the value of the subscription system by prepaid or postpaid cards at very affordable costs, to the multiple facilities also that offers the mobile phone. The use of the mobile phone remains particular because it is more adopted by the low-income population to reduce their expenses, so save money. In the sense of always contributing to the expansion of the adoption of information and communication technologies (including the mobile phone) efforts are being made by private and public, national and international institutions to promote their access and their usage
28
Chour, Hussein. "Full-Duplex Device-to-Device Communication for 5G Network". Thesis, CentraleSupélec, 2019. http://www.theses.fr/2019CSUP0002.
Abstract (sommario):
Avec la croissance rapide de la demande de trafic de données des clients, l'amélioration de la capacité du système et l'augmentation du débit des utilisateurs sont devenues des préoccupations essentielles pour le futur réseau de communication sans fil de cinquième génération. Dans ce contexte, la communication terminal-à-terminal (Device-to-Device D2D) et le Full Duplex (FD) sont proposés comme solutions potentielles pour augmenter l’efficacité spectrale et le débit des utilisateurs dans un réseau cellulaire. Le D2D permet à deux périphériques proches de communiquer sans participation de la station de base ou avec une participation limitée. D'autre part, la communication en FD permet une transmission et une réception simultanées dans la même bande de fréquence. En raison de la propriété de distance courte des liaisons D2D, exploiter la technologie FD dans la communication D2D est un excellent choix pour améliorer encore plus l’efficacité spectrale cellulaire et le débit des utilisateurs. Cependant, les émetteurs-récepteurs FD constituent de nouveau défis pour la communication D2D. Par exemple, en FD les émetteurs-récepteurs ne peuvent pas supprimer d’une manière parfaite l’auto-interférence (SI) générée au niveau des récepteurs lors de la transmission des données (par le propre émetteur du dispositif cellulaire). Ainsi, l’auto-interférence résiduelle qui est étroitement liée à la valeur de la puissance de l’émetteur affecte fortement les performances de la transmission FD. De plus, la technique en FD crée des interférences supplémentaires dans le réseau, ce qui peut dégrader ses performances par rapport à la transmission en semi-duplex (Half-duplex HD). Ainsi, une bonne gestion des ressources radio est nécessaire pour exploiter les avantages de la FD et garantir la qualité de service (QoS) des utilisateurs. Les travaux de cette thèse portent sur l'allocation de puissance et l'attribution de canaux d'un réseau FD-D2D. En particulier, cette thèse aborde d’abord le problème de l’allocation de puissance et propose une méthode d'allocation de puissance (PA) optimale centralisée simple mais efficace, puis développe le schéma optimal conjoint d’AP et d’AC pour un réseau FD-D2D. Un algorithme de complexité réduite CATPA, basé sur une allocation CA suivie d'une allocation PA, est aussi développée et proposé. La thèse présente à la fin une stratégie efficace d'AP décentralisée en utilisant les outils de la théorie des jeuxWith the rapidly growing of the customers' data traffic demand, improving the system capacity and increasing the user throughput have become essential concerns for the future 5G wireless communication network. In this context, D2D communication and FD are proposed as potential solutions to increase the spatial spectrum utilization and the user rate in a cellular network. D2D allows two nearby devices to communicate without BS participation or with limited participation. On the other hand, FD communication enables simultaneous transmission and reception in the same frequency band. Due to the short distance property of D2D links, exploiting the FD technology in D2D communication is an excellent choice to further improve the cellular spectrum efficiency and the users’ throughput. However, practical FD transceivers add new challenges for D2D communication. For instance, the existing FD devices cannot perfectly eliminate the SI imposed on the receiver by the node’s own transmitter. Thus, the RSI which is tightly related to the transmitter power value highly affects the performance of FD transmission. Moreover, the FD technique creates additional interference in the network which may degrade its performance when compared with the half-duplex transmission. Thus, proper radio resource management is needed to exploit the benefits of FD and guarantee the QoS of the users. The works in this dissertation focus on the PA and CA of a FD-D2D network. In particular, this thesis first addresses the PA problem and proposes a simple yet efficient centralized optimal PA framework, and next, it derives the optimal joint PA and CA scheme for an FD-D2D network. A simple sub-optimal algorithm for resource allocation named CATPA, based on CA followed by PA, is also derived and proposed. This dissertation also develops, in the end, an efficient decentralized PA using game theory tools that will be an essential part of future works in the context of distributed radio resource management
29
Dreina, Emmanuel. "Conception, optimisation et intégration RF d'un système d'antennes miniatures multicapteurs utilisant la diversité en vue d'augmenter les eprformances radio d'un terminal mobile 4G". Grenoble INPG, 2010. http://www.theses.fr/2010INPG0060.
Abstract (sommario):
Les communications en milieux urbains et intérieurs sont altérées par les trajets multiples à l'origine d'évanouissements de puissance du signal au niveau du récepteur. La diversité d'antennes constitue un moyen efficace pour améliorer le lien radio dans ces environnements. Nous avons donc travaillé sur différents systèmes d'antennes compactes présentant de la diversité. Afin de comparer leurs performances, nous avons développé une méthodologie d'évaluation théorique de la diversité en introduisant de nouvelles notions comme le gain de diversité référencé. Cette méthodologie permet de choisir le système d'antennes le plus adapté pour une application donnée. Nos travaux portent également sur la mise au point d'un banc de test permettant de quantifier l'amélioration du lien radio en termes de TEB apportée par un système à diversité d'antennes. Cette méthode d'évaluation expérimentale se différencie de l'état de l'art par l'utilisation de signaux modulés correspondant à des standardsLn urban or indoor environment, communications are altered by multiple reflections leading to multipath fading on RF signal. Antenna diversity provides an efficient me ans to improve the radio link in these environments. We worked on different compact diversity antennas structures. To compare their performance, we have developed a theoretical methodology for diversity evaluation by introducing new concepts like the referenced diversity gain. This methodology allows choosing an optimized antenna system for a given application. Ln addition to our study on theoretical tools, we developed a test bench in order to quantify the radio link improvement bring by an antenn versity system in terms of BER. Our experimental method for diversity gain evaluation involves a testbench using realistic modulated RF signaIs. It differs from experimental methods proposed in recent previous works. Finally, experimental procedure and first measurement results are detailed in this document
30
Filice, Francesco. "Solutions innovantes d'antennes en bande Ku- et Ka- en technologie d’impression 3-D pour la réalisation des réseaux phasés visant des applications 5G et des communications mobiles par satellite". Thesis, Université Côte d'Azur, 2020. http://www.theses.fr/2020COAZ4023.
Abstract (sommario):
L'utilisation exponentielle d’applications mobiles entraîne une demande en constante croissance pour des débits de données de plus en plus élevés associées à des solutions de télécommunications mobiles à faible coût. Alors que les réseaux 5G en sont encore à leur début, les télécommunications mobiles par satellite (Sat-Com-On-The-Move) peuvent jouer un rôle central dans cette problématique. La bande passante disponible dans les bandes de fréquences Ku- (10,75-14,5 GHz) et Ka- (18-31 GHz) pour ces applications peut être exploitée afin de fournir une connexion internet globale à haut débit et faible coût. Des entreprises comme SpaceX déploient actuellement de grandes constellations de satellites positionnées sur des orbites terrestres basses et pouvant répondre à ces besoins. Néanmoins, le prix et le facteur de forme des terminaux utilisateurs à réflecteur motorisé existants restent les principaux goulots d'étranglement pour rendre ces technologies abordables à une grande partie de consommateurs. La bande passante opérationnelle atteignable par les éléments rayonnants intégrés à faible profil (i.e. réseaux d’antennes à fentes) étant limité, la plupart des solutions existantes divisent la transmission (Tx) et la réception (Rx) dans deux panneaux rayonnants différents ce qui impose un coût relativement élevé pour les utilisateurs finaux. L'objectif de cette thèse consiste à développer des solutions d'antennes innovantes à faible coût et à large bande, notamment des antennes patch à couplage par fente et des antennes à guides d'ondes nervurés fabriqués avec des circuits imprimés standard (PCB) et par impression 3D en métal. Ces antennes sont censées couvrir la totalité de la bande Ku et Ka afin de permettre la création de terminaux utilisateur Sat-Com-On-The-Move à faible encombrement capables d'effectuer à la fois les fonctions Rx et Tx à l'aide d'un seul panneau antennaire. Une attention particulière est accordée à la possibilité d'intégrer ces éléments rayonnants dans de petits réseaux à utiliser comme cellule unitaire pour la réalisation de plus grands, en envisageant la possibilité d'atteindre les niveaux de gain requis par ce type de télécommunicationsThe increasing use of mobile applications leads to a growing demand for higher data-rates and low-cost mobile telecommunication solutions. While 5G networks are still at their early stages, a central role can be played by the mobile satellite telecommunications (Sat-Com-On-The-Move). The frequency bandwidth available at Ku- (10.75-14.5 GHz) and Ka- (18-31 GHz) bands for these applications can be leveraged in order to provide worldwide, high-speed and low-cost internet connections. Companies like SpaceX are actually deploying large satellite constellations required to work at Low Earth Orbits and offer such services. Nevertheless, the price and the form factor of the traditional motorized reflector-based user terminals remain the main bottlenecks in order to make these technologies affordable to the mass-market consumers. The limited operational bandwidth of the radiating elements integrated in their low-profile alternatives (i.e. slotted waveguide antenna arrays) actually obliges to split transmission (Tx) and reception (Rx) in two different panels, keeping a relatively high cost for the end-users. The objective of this thesis is to develop innovative low-cost and wideband antenna solutions, notably microstrip aperture coupled patch and double ridged waveguide antennas, to be respectively realized by standard Printed Circuit Board (PCB) and metal 3-D printing. These antennas are meant to cover the whole Ku- and Ka- band in order to allow the creation low-profile Sat-Com-On-The-Move user terminals able to perform both Rx and Tx using a single antenna panel. A particular attention is given to the possibility to integrate these radiating element in small arrays to be used as unit cell for the realization of larger ones, envisaging the possibility to achieve the levels of gain required by this kind of telecommunications
31
Gil, Fernando de Oliveira. "Metodologia de avaliação de segurança das comunicações entre controlador e piloto via enlace de dados (CPDLC) aplicada em áreas terminais". Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3141/tde-11082011-130403/.
Abstract (sommario):
Com o crescimento do setor aeronáutico faz-se necessário a criação de novas tecnologias para que a capacidade do sistema possa aumentar sem provocar perdas nos níveis de segurança. Para isso foi criado o CNS/ATM, um paradigma que integra tecnologias de comunicação, navegação e vigilância em um sistema de gerenciamento de tráfego aéreo global. No âmbito das comunicações entre controlador e piloto, o atual sistema de fonia via rádio analógico é substituído por um enlace de dados, chamado de Controller-Pilot Data Link Communication (CPDLC). Esta alteração promove polêmica entre aeronautas e autoridades, de forma que é essencial um estudo aprofundado que comprove sua eficácia. Dessa forma, esta pesquisa visa avaliar a segurança do CPDLC quando utilizado em Áreas Terminais do Espaço Aéreo. Para a realização desta pesquisa, foi criada uma metodologia de avaliação de segurança utilizando simuladores de voo, de tráfego aéreo e de comunicação CPDLC combinados com uma análise por meio de modelos de Markov. O procedimento de chegada ao aeroporto de Congonhas, situado na Terminal São Paulo, foi utilizado como referência para aplicação desta metodologia. Os resultados obtidos mostraram que o sistema atual de comunicação, via voz, está no limite do atendimento dos níveis internacionais de segurança para a demanda atual. Contudo, a comunicação por enlace de dados atende, e em alguns casos inclusive melhora, o nível de segurança desta região do espaço aéreo.With the growth of the aviation industry it is necessary to create new technologies that can increase the system capacity without loss in the safety levels. Because of this the CNS/ATM was created, a paradigm that integrates communication, navigation and surveillance technologies with a global air traffic management. For the communications between controllers and pilots, the current system of voice over analog radio is being replaced by a data link, called the Controller-Pilot Data Link Communication (CPDLC). This replacement raises debates between airmen and authorities, demanding a detailed study that proves its effectiveness. Thus, this research aims to evaluate the CPDLC safety when used in Terminal Airspace Areas. For this research, was created a methodology for security assessment using flight, air traffic, and CPDLC simulators combined with a Markov model analysis. The Congonhas airport arrival procedure, located in São Paulo Terminal, was used as reference for this methodology application. The results showed that the current system of voice communication is on the limit of fulfilling the international safety levels for the current demand. However, the data link communication addresses, and in some cases even improve, the safety level for this airspace region.
32
Sandel, Olivier. "Modèle d'Interface Intelligente pour Terminaux de Communication". Phd thesis, Université Louis Pasteur - Strasbourg I, 2002. http://tel.archives-ouvertes.fr/tel-00453013.
Abstract (sommario):
La présente Thèse en Intelligence Artificielle est basée sur un tout premier concept nommé “Assistant Conversationnel”, lequel est abordé par le fait qu'un utilisateur quelconque souhaitant joindre un interlocuteur doit pouvoir toujours voir sa requête se réaliser, quelque soit le moyen choisi par le terminal et sans que l'utilisateur ait à choisir lui-même le moyen adéquat. Le problème principal à résoudre se définit en conséquence par la modélisation et la conception d'une interface intelligente, personnalisée et praticable par tous les publics sur les terminaux de communication spécialisables accédant à Internet. Nous avons alors créé et développé de nouveaux procédés “intelligents”, chargés entre-autres de rendre les opérations courantes moins fastidieuses sur des applications de messagerie électronique. Pour cela, nous avons établi un état de l'art des divers terminaux de communication disponibles sur le marché mondial, ainsi qu'une classification taxinomique poussée et une nouvelle hiérarchisation efficace des interfaces intelligentes. Puis, nous avons construit un “Modèle Auto-Adaptable d'Utilisateur” sur un apprentissage comportemental, incrémental et évolutif, finalement implémenté en quatre phases : 1. Analyse, représentation et classification des différentes actions réalisées par l'utilisateur. 2. Proposition régulière à l'utilisateur d'effectuer de manière auto-adaptable les actions apprises. 3. Exécution auto-adaptable de ces différentes séquences d'actions répétitives. 4. Simplification auto-adaptable d'éventuelles “erreurs” ou incohérences de manipulation. Ainsi, cette contribution innovante à l'interfaçage homme-machine avancé a permis d'aboutir à la validation complète d'un logiciel intelligent de communication, tout-à-fait autonome et portable, capable d'assister chaque utilisateur, néophyte comme très expérimenté, dans ses divers travaux quotidiens, et ce de manière conviviale et toujours respectueuse de ses préférences.
33
GUIMARAES, ALBERTO GASPAR. "RADIOLOCATION OF MOBILE COMMUNICATIONS TERMINALS". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5906@1.
Abstract (sommario):
PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROEste trabalho lida com o problema de radiolocalização de terminais em um ambiente de comunicações móveis celulares. Desenvolve-se novas alternativas para a estimação da posição, admitindo-se que as medidas de tempo de chegada (ToA) obtidas no enlace-rádio estão corrompidas por ruído aditivo e apresentam erro médio positivo durante períodos aleatórios, devido à ausência de linha de visada (NLOS) entre terminal e estações radio-bases. Em uma das alternativas desenvolve-se um estimador assintoticamente eficiente do erro de NLOS, sob o critério de mínimos quadrados ponderados (WLS). Para esta estimativa, admite- se o conhecimento a priori do espalhamento temporal do canal, e que o perfil de potência do sinal pode ser calculado por uma média temporal de medidas independentes em um receptor RAKE. O esquema de localização apresentado incorpora também um teste de hipóteses desenvolvido sob o critério de Neyman-Pearson, para detectar, a cada instante de tempo, a ocorrência de transições entre os estados LOS/NLOS do canal. Em outra contribuição do trabalho, as coordenadas do terminal são estimadas recursivamente utilizando-se algoritmos bayesianos, com a dimensão do espaço de estados aumentada para incluir o efeito do erro de NLOS sobre as medidas de ToA. Resultados de simulação obtidos sob diferentes cenários comprovam a eficiência dos esquemas de estimação aqui desenvolvidos, quando comparados à única solução de que se tem conhecimento na literatura. Apresenta-se ainda nesta tese uma análise para o problema de ambigüidade em métodos hiperbólicos de localização, cujo objetivo é identificar a região do plano em que este método fornece duas soluções fisicamente admissíveis. A área desta região é comparada com a área total de triangulação.
This work addresses the radiolocation problem of a moving terminal in a cellular mobile communications environment. New alternatives are developed for position estimation, assuming that the Time of Arrival (ToA) measurements obtained from radio link are corrupted by additive noise and have positive mean error during random periods of time due to the non-line of sight (NLOS) propagation condition between the terminal and base stations. In one of the proposals, an asymptotically efficient WLS estimator of the NLOS error is developed under the Weighted Least Squares criterion. It is assumed that the channel temporal scattering model is known and the mean power delay profile can be evaluated by time averaging independent measurements from a RAKE receiver. The location estimation scheme also includes a hypothesis testing based on Neyman- Pearson approach to detect at each instant of time the LOS/NLOS states transitions. In another contribution, the terminal coordinates are recursively estimated using bayesian algorithms, with the state-space dimension augmented to include the NLOS error effect over ToA measurements. Simulation results obtained under different scenarios show the effectiveness of the estimation schemes developed here when compared to the only alternative known from the literature. An analysis concerning the ambiguity problem in hyperbolic location methods is also presented, aiming to determine the regions where this method gives two physically admissible solutions, and compare them to the total trilateration area.
34
Niederriter, Joan E. "Student nurses' perception of death and dying". Cleveland, Ohio : Cleveland State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=csu1246756404.
Abstract (sommario):
Thesis ( Ph.D.)--Cleveland State University, 2009.Abstract. Title from PDF t.p. (viewed on July 22, 2009). Includes bibliographical references (p. 146-160). Available online via the OhioLINK ETD Center and also available in print.
35
Asplund, Kenneth. "The experience of meaning in the care of patients in the terminal stage of dementia of the Alzheimer type : interpretation of non-verbal communication and ethical demands". Doctoral thesis, Umeå universitet, Institutionen för omvårdnad, 1991. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-96891.
36
Campbell, David Hal. "Terminal /". Online version, 2010. http://content.wwu.edu/cdm4/item_viewer.php?CISOROOT=/theses&CISOPTR=348&CISOBOX=1&REC=19.
37
Albadri, Rand. "Jämförande analys av driftsäkerhet medRTU och PLC". Thesis, Högskolan Väst, Avdelningen för data-, elektro- och lantmäteriteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-8190.
Abstract (sommario):
Examensarbetet kommer att göra en jämförande analys av driftsäkerhet med trådade signaler till en Remote Terminal Unit (RTU) och en Programmable Logic Controller (PLC) med busstyrning. Rapporten genomfördes som ett uppdrag av Skellefteå Kraft AB för att se om det möjligt att byta till PLC- med busstyrning. Rapporten redogör för grundläggande beskrivning för skillnaden mellan de här två system och kommer att undersöka vilken som är driftsäkrare och lönsammare med hänsyn till krav enligt Svenska Kraftföretagens riktlinjer för dammsäkerhet (Ridas).Med hjälp av kurslitteratur, ABB handboken, internet websidor samt intervjuar med Skellefteå Kraft AB:s personal har arbetets resultat visat att busstyrning med PLC kommer att fungera driftsäkert samt kommer att bli lönsamt jämfört med trådade signaler till RTU. Resultat visat även att det finns ingenting som hindrar att installera busstyrning enligt Ridas men vissa funktioner bör installeras. Rapporten är avgränsat genom att inte ta upp eventuella krav från miljöbalken.This thesis will make a comparative analysis of the operation safety of the wire connection to Remote Terminal Unit (RTU) and Programmable Logic Controller (PLC) with bus-controller. The report describes the basic description of the difference between these two systems and will explore which is safer and more economic with consideration to qualification according to Swedish energy companies' guidelines for dam safety (Ridas).Through course literature, ABB Bok, internet web sits and interviews with Skellefteå Kraft AB staff the result of this report have been created.The report results prove that PLC with bus-controller will operate operationally safe and profitable compared to wire connection to RTU. Results also showed that there is nothing which prevents to install bus-controller according to RIDAS but certain features should be installed.
38
Lönnesjö, Rebecca, e Nathalie Björkman. "Sjusköterskans förmåga att kommunicera med patienter i livets slutskede för att lindra existentiellt lidande". Thesis, Högskolan i Halmstad, Akademin för hälsa och välfärd, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-44125.
Abstract (sommario):
Bakgrund: Palliativ vård innebär att ge vård till patienter i livets slutskede där målet syftar till att lindra lidandet. Lidandet anses vara ett problemområde för den palliativa patienten. Existentiellt lidande yttrar sig individuellt och är vanligt förkommande för palliativa patienter. Sjuksköterskan besitter fyra ansvarsområden enligt ICN:s etiska kod, vilket innefattar att främja hälsa, lindra lidande, förebygga sjukdom och återställa hälsa. Kommunikationen är ett viktigt verktyg för att anpassa omvårdnaden utifrån den unika patientens behov. Syfte: Undersöka sjuksköterskans förmåga att kommunicera med patienter i livets slutskede och om detta kunde bidra med att lindra det existentiella lidandet. Metod: En allmän litteraturstudie som var skapad utifrån ett systematiskt förhållningssätt med en induktiv ansats. Resultat: Kommunikationen visade sig ha en betydande roll för att lindra lidandet hos den existentiellt lidande patienten. Viktiga egenskaper som identifierades var sjuksköterskans kommunikation via relation samt kommunikationsverktygen: empatisk kommunikation, tid och tidpunkt, en relation byggd på förtroende samt sjuksköterskans förmåga att initiera till samtal. Slutsats: Litteraturstudien påvisade flera kommunikationsverktyg som kunde vara behjälpligt i kommunikationen med den existentiellt lidande patienten. Att som sjuksköterska kunna identifiera patientens behov av att samtala, utläsa lämplig tidpunkt samt att kunna tolka när det finns ett behov av att ta ett steg tillbaka ansågs viktigt.Background: Palliative care involves providing care to patients in the final stages of life where the goal is to alleviate suffering. Suffering is considered a problem area for the palliative patient. Existential suffering manifests itself individually and is common in palliative care. The nurse has four responsibilities under the ICN Code of Ethics, which includes promoting health, alleviating suffering, preventing illness and restoring health. Communication is an important tool for adapting nursing based on the unique patient’s needs. Purpose: To investigate the nurse's ability to communicate with patients at the end of life and whether this could help alleviate existential suffering. Method: A general literature study that was created based on a systematic approach with an inductive focus. Results: Communication proved a major significant role in alleviating the suffering of the existentially suffering patient. Important characteristics that were identified were the nurse's communication through relationship and the communication tools: empathic communication, time and moment, a relationship based on trust and the nurse's ability to initiate conversations. Conclusion: The literature study identified several communication tools that could be helpful in communicating with the existentially suffering patient. As a nurse, being able to identify the patient's need to talk, read out the appropriate time and to be able to interpret when there is a need to take a step back was considered important.
39
Sakai, Rodrigo Martins Romeira. "Rede serial para comunicação de dados e controle em sistema embarcado: estudo de implementação da ISO 11783". Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/18/18145/tde-19012011-135711/.
Abstract (sommario):
As redes digitais demonstraram ser uma solução eficaz em automação. A conexão de diferentes módulos de diferentes fabricantes em um único barramento para a troca de dados e controle é um desafio para a indústria brasileira de máquinas agrícolas, apesar desta tecnologia estar consolidada em automóveis, aeronaves e em chão de fábrica. As vantagens obtidas com redes digitais são evidentes, porém necessitam de implementação de protocolos de redes. Na área agrícola, a norma internacional ISO 11783 apresenta forte potencial para tornar-se referência de padrão para a troca de dados entre módulos em tratores e implementos agrícolas. Esta norma, também conhecida como ISOBUS, está no estágio avançado de desenvolvimento. Contém quatorze documentos e o seu desenvolvimento está apoiado por grupos denominados \"Força Tarefa\", na Europa, nos EUA e recentemente no Brasil. Implementações deste padrão já estão sendo apresentadas no mercado internacional, em feiras e demonstrações de aplicação desta tecnologia. O Brasil deve investir e dominar a tecnologia, em busca de compatibilidade internacional tanto no ponto de vista tecnológico como comercial. Neste contexto, este trabalho encoraja o desenvolvimento nacional em aplicações com a norma ISOBUS, apresentando dois estudos de casos, cujos módulos comunicam com equipamentos de mercado compatíveis com a norma. Estas experiências práticas complementam trabalhos acadêmicos relativos a este tema, que surgiram nos últimos anos no Brasil.The digital networks demonstrated to be an effective solution in automation. The connection of different modules from different manufacturers into a single bus for the exchange of data and control is a challenge for the agricultural machinery Brazilian industry, although this technology is consolidated in automobiles, aircraft and the factory floor. The benefits obtained with digital networks are obvious, but they need implementation of protocols networks. In the agricultural area, the international standard ISO 11783 shows strong potential to become the reference standard for the exchange of data between modules on tractors and agricultural implements. This standard, also known as ISOBUS, is in the advanced stage of development. It contains fourteen documents and its development is supported by groups called \"Task Force\" in Europe, USA, and recently in Brazil. Implementations of this standard are now being presented in the international market, in fairs and demonstrations of application of this technology. Brazil should invest and dominate the technology, to inquire after international compatibility in both the technological point of view as commercial. In this context, this work encourages the national development in applications with ISOBUS standard, presenting two studies of cases, whose modules communicate with equipment market compatible with the standard. These practical experiences complement academic works on this subject, which emerged in recent years in Brazil.
40
Fong, Wan-hang Angela, e 方蘊蘅. "Cruise terminal". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31985166.
41
Hall, Matthew William. "Aquarama Terminal". Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/19302.
Abstract (sommario):
One of the major challenges of the 21st century is the rapid growth of many citiesand the decline of others.
There are many cities like Cleveland which were built to serve a far greater population
than currently inhabits the city. Infrastructure built for 800,000 now services
400,000 leaving creating surplus capacity and derelict spaces; urban voids which
have fallen into disuse. Manufacturing and shipping industries occupy valuable
waterfront space, highways create rifts and large civic public spaces designed
with the best of intentions create vacuums.
Cleveland is not dealing with the issue of growth but with transformation; in its
remaking as a place of mixed communities and neighborhoods. Understanding
the city spatially is the first part of an exploration into devising interventions that
can utilize existing infrastructure, reclaim and re-purpose spaces to generate new
uses and new vitality. This thesis is concerned with identifying an opportunity and
proposing a programmatic and spatial transformation.
Master of Architecture
42
Fong, Wan-hang Angela. "Cruise terminal". Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B25948805.
43
Williams, D. H. "A vehicle-mounted terminal for European satellite-mobile radio services : Development of a low-cost vehicle-mounted earth station for projected satellite-mobile services in Europe and considerations for achievement of multiple service access capability". Thesis, University of Bradford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381064.
44
Ee, Lee. "Antenna design for future mobile communication terminals". Thesis, University of Birmingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.633123.
Abstract (sommario):
The vision of the Personal Communication System is to provide ubiquitous communication anytime, anywhere in the world. This has led to the development of multiple standards that are currently being used throughout the world. The purpose of this thesis is to look at some of these scenarios and proposed innovative antenna design solutions to meet the needs of the current and future generation wireless communication systems. This thesis entitled "Antenna Design for Future Mobile Communication Terminals" documented the work done from 22 nd September 1997 to 1 st April 2001. To this end, three wireless scenarios were identified. In the first scenario, the implications and demands for both terrestrial and satellite communication systems were examined. This led to the development of a highly innovative and integrated compact microstrip antenna with dual polarisation capabilities. The proposed microstrip antenna is able to operate at both GSM and Iridium frequencies simultaneously. The radiation characteristic of the proposed antenna is such that there is no need to re-orientate the antenna for either satellite or terrestrial operation. In the next wireless scenario, the implication of the proliferation of different types of terrestrial mobile standards around the world means that future mobile antennas need to be capable of either multi-band or wide-band performances. To this end, two novel antennas based on the monopole antenna geometry have been developed. In both cases, both the proposed antennas exhibited very good dual band capabilities. In addition, one of the proposed antennas, the novel compact planar monopole, can also be optimised for wide-band operations. This compact planar antenna is capable of providing cellular coverage for the following mobile frequency bands; GSM, AMPS, DCS 1800, DECT, Bluetooth, wireless LAN, UMTS and its extension bands. In the last scenario, antenna design solutions that are able to minimise the effect of signal fading on a mobile terminal were investigated. Although there are a number of techniques available, the emphasis in this particular thesis is on the development of compact pattern diversity antennas. To this end, two innovative antenna structures will be introduced. One of the proposed designs made used of the H-patch geometry and a simple switching network to generate the required pattern diversity performance. In the other design, a patch antenna configuration has been used to generate the same pattern diversity performance. The electrical performance characteristics of these proposed antennas have also been measured. An attempt was also made to develop simple antenna circuit models using the transmission line method. These circuit models have been successfully used to predict the performance and resonant frequency behaviours of the compact microstrip antennas. These models also helped to explain the operation of the various compact microstrip antennas in terms of their various parasitic elements. This provides a simple and insightful look into the operation of these classes of microstrip antennas.
45
Glass, Abdullatif M. "Digital communication networks incorporating mobile data terminals". Thesis, Aston University, 1989. http://publications.aston.ac.uk/8086/.
Abstract (sommario):
The use of digital communication systems is increasing very rapidly. This is due to lower system implementation cost compared to analogue transmission and at the same time, the ease with which several types of data sources (data, digitised speech and video, etc.) can be mixed. The emergence of packet broadcast techniques as an efficient type of multiplexing, especially with the use of contention random multiple access protocols, has led to a wide-spread application of these distributed access protocols in local area networks (LANs) and a further extension of them to radio and mobile radio communication applications. In this research, a proposal for a modified version of the distributed access contention protocol which uses the packet broadcast switching technique has been achieved. The carrier sense multiple access with collision avoidance (CSMA/CA) is found to be the most appropriate protocol which has the ability to satisfy equally the operational requirements for local area networks as well as for radio and mobile radio applications. The suggested version of the protocol is designed in a way in which all desirable features of its precedents is maintained. However, all the shortcomings are eliminated and additional features have been added to strengthen its ability to work with radio and mobile radio channels. Operational performance evaluation of the protocol has been carried out for the two types of non-persistent and slotted non-persistent, through mathematical and simulation modelling of the protocol. The results obtained from the two modelling procedures validate the accuracy of both methods, which compares favourably with its precedent protocol CSMA/CD (with collision detection). A further extension of the protocol operation has been suggested to operate with multichannel systems. Two multichannel systems based on the CSMA/CA protocol for medium access are therefore proposed. These are; the dynamic multichannel system, which is based on two types of channel selection, the random choice (RC) and the idle choice (IC), and the sequential multichannel system. The latter has been proposed in order to supress the effect of the hidden terminal, which always represents a major problem with the usage of the contention random multiple access protocols with radio and mobile radio channels. Verification of their operation performance evaluation has been carried out using mathematical modelling for the dynamic system. However, simulation modelling has been chosen for the sequential system. Both systems are found to improve system operation and fault tolerance when compared to single channel operation.
46
Panchillo, Caroline, e Alyssa Yodkaew. "Sjuksköterskans upplevelse av omvårdnad för patienter med existentiell smärta vid vård i livets slutskede : En litteraturöversikt". Thesis, Röda Korsets Högskola, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:rkh:diva-4034.
Abstract (sommario):
Background: Palliative care aims to alleviate the suffering and bring quality of life to patients who have an incurable disease diagnosis. Patients who are in need of palliative care can usually experience different dimensions of pain. Suffering in the form of existential pain can lead to strong emotions such as death anxiety and hopelessness. Several studies have shown that existential pain is not as noticed as other dimensions of pain and thus increased knowledge is needed about this form of pain. Aim: The aim of the study was to describe the nurse's experience of nursing for patients with existential pain in end-of-life care. Method: A literature review conducted with a qualitative approach. Ten articles were identified and analyzed using a thematic analysis. Result: Two themes and four subthemes were identified. Existential care with subthemes communication between nurse and patient and person-centered care. The second theme was emotional challenge with subthemes conveying hope and approach towards patients. Conclusion: The delivering of existential care in the case of existential pain can be considered challenging for the nurse where many aspects and dimensions must be taken into consideration, such as the nurses’ feelings of exhaustion and powerlessness.Bakgrund: Palliativ vård har i syfte att lindra lidandet och förbättra livskvalitén hos patienter som har en obotlig sjukdomsdiagnos. Patienter som är i behov av palliativ vård kan oftast uppleva olika dimensioner av smärta. Lidande i form av existentiell smärta kan leda till starka känslor som dödsångest och hopplöshet. Flera studier har påvisat att den existentiella smärtan inte är lika uppmärksammad som övriga dimensioner av smärta och därmed behövs utökad kunskap kring denna form av smärta. Syfte: Syftet med studien var att beskriva sjuksköterskans upplevelse av omvårdnad för patienter med existentiell smärta vid vård i livets slutskede. Metod: En litteraturöversikt genomförd med kvalitativ ansats. Tio artiklar identifierades och analyserades med en tematisk analys. Resultat: Två teman och fyra subteman identifierades. Existentiell omvårdnad med subteman kommunikation mellan sjuksköterska och patient samt personcentrerad vård. Det andra temat var emotionell utmaning med subteman förmedla hopp och bemötande gentemot patienter. Slutsats: Förmedling av existentiell omvårdnad vid existentiell smärta kan anses vara utmanande för sjuksköterskan där fler aspekter och dimensioner bör beaktas, som exempelvis känslor av utmattning och maktlöshet hos sjuksköterskan.
47
Brown, Timothy W. C. "Antenna diversity for mobile terminals". Thesis, University of Surrey, 2002. http://epubs.surrey.ac.uk/2125/.
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Guzmán, Gajardo Gustavo Adolfo. "Terminal de captura". Tesis, Universidad de Chile, 2010. http://www.repositorio.uchile.cl/handle/2250/101508.
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Cabrera, Reyes Yerko. "Terminal portuario Pargua". Tesis, Universidad de Chile, 2006. http://repositorio.uchile.cl/handle/2250/100970.
Abstract (sommario):
La iniciativa de introducirse en el tema de la conectividad de la isla grande de Chiloé con el
continente para desde esa problemática plantear un proyecto de arquitectura, nace tanto
de la experiencia de trabajar académicamente en la isla (trabajos voluntarios en T.R.E.P.A.
y ramos como Patrimonio Arquitectónico de Chiloé del profesor H. Montecinos), como de
los temas públicos de contingencia, en este caso, el planteamiento del proyecto del “Puente
Bicentenario” sobre el canal de Chacao.
La problemática de la conectividad de la isla de Chiloé con el continente no ha estado
en la discusión pública solo en estos últimos meses, sino que se viene arrastrando desde su
anuncio durante el gobierno del Presidente Frei Ruiz-Tagle. La polémica fue abierta desde
un comienzo por el proyecto de puente colgante propuesto, dejando en segundo plano la
discusión sobre los tipos de soluciones para los distintos tipos de necesidades de la región.
Es así como desde un principio se plantea un proyecto que asuma una visión
alternativa a la entonces propuesta oficial, esto es, el desarrollo y modernización del
sistema de transporte actual en base a transbordadores. Ejemplos existen en diversos
países, siendo los mayormente considerados para efectos de antecedentes que permitan
proponer un sistema realmente factible, experiencias en Noruega y Suecia, y normativas
desarrolladas en España para dicho país y para la comunidad europea en general, normas
también consideradas por parte de la D.O.P. (Dirección de Obras Portuarias), departamento
dependiente del Ministerio de Obras Públicas (M.O.P.T.T.) y encargado de plantear las
líneas generales a seguir en las nuevas propuestas de conectividad para la isla de Chiloé.
Se presentarán las problemáticas desarrolladas, especialmente lo concerniente al
concepto de conectividad, como fundamento de la tipología de conexión tomada en cuenta
en el proyecto además de los antecedentes que lo soportan, para luego analizar las
características físicas y urbanas del sector de Pargua a nivel regional, a nivel local y la
relación del emplazamiento escogido con dichos sistemas. Posteriormente se abordará el
proyecto mismo, presentado en sus diferentes niveles de desarrollo.
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Syed, Asif Ahmed. "Water Transport Terminal". Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/31738.
Abstract (sommario):
This thesis is an attempt in the exploration of an architectural idea of breaking away from a conventional column beam structure.
This idea led to a geometrical form which would be most stable, supported by itself, and also helps mitigate the lateral forces of wind and water in which it would stand. The conical form and scale achieved in the proposal would also help create a landmark to the cityâ s growing skyline.
It also acts as the point of threshold between land and water, providing an opportunity to sense water in a variety of ways.Master of Architecture