Rozprawy doktorskie na temat „Multi-terminal network”
Utwórz poprawne odniesienie w stylach APA, MLA, Chicago, Harvard i wielu innych
Sprawdź 17 najlepszych rozpraw doktorskich naukowych na temat „Multi-terminal network”.
Przycisk „Dodaj do bibliografii” jest dostępny obok każdej pracy w bibliografii. Użyj go – a my automatycznie utworzymy odniesienie bibliograficzne do wybranej pracy w stylu cytowania, którego potrzebujesz: APA, MLA, Harvard, Chicago, Vancouver itp.
Możesz również pobrać pełny tekst publikacji naukowej w formacie „.pdf” i przeczytać adnotację do pracy online, jeśli odpowiednie parametry są dostępne w metadanych.
Przeglądaj rozprawy doktorskie z różnych dziedzin i twórz odpowiednie bibliografie.
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.
Pełny tekst źródłaQC 20121015
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.
Pełny tekst źródłaNext-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
Tran, Phuoc Nguyen. "Modèles de sélection d'interface et d'association flux/interface pour les terminaux mobiles multi-interfaces". Phd thesis, Télécom ParisTech, 2010. http://pastel.archives-ouvertes.fr/pastel-00564095.
Pełny tekst źródłaTran, Phuoc Nguyen. "Modèles de sélection d'interface et d'association de flux/interface pour les terminaux mobiles multi-homés". Phd thesis, Paris, Télécom ParisTech, 2010. https://pastel.hal.science/pastel-00564095.
Pełny tekst źródłaThe diversity of radio access technologies (e. G. , GPRS, UMTS, HSDPA,Wi-Fi, WiMAX, LTE…), their complementary in terms of coverage area, technical characteristics (e. G. , bandwidth, QoS) and commercial opportunities for the operators lead to the development of mobile terminals integrating multiple radio interfaces. The ability of mobile terminals to support various interfaces provides many interesting benefits, such as permanent and ubiquitous access, reliability, load sharing/load balancing, bandwidth aggregation, and muti-criteria interface selection. Mobile terminals with several radio interfaces have the possibility to choose the ―best‖ interface according to several parameters such as application characteristics, user preferences, network characteristics, operator policies, tariff constraints, etc. It becomes also possible to associate the applications to the available network interfaces basing mainly on application requirements. In the thesis, we tackle the interface selection issue where a mobile terminal equipped with several interfaces has to select at any time the best interface or the best access technology according to multiple criteria. We particularly focus on the decision schemes and investigate the MADM methods. The fundamental objective of the MADM methods is to determine among a finite set of alternatives the optimal one. MADM includes many methods such as Simple Additive Weighting (SAW), Weighting Product (WP), and Technique for Order Preference by Similarity to Ideal Solution (TOPSIS)
Smailes, Michael Edward. "Hybrid HVDC transformer for multi-terminal networks". Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31173.
Pełny tekst źródłaMerlin, Michael Marc Claude. "Hybrid multi-level HVDC converter and multi-terminal DC networks". Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/39382.
Pełny tekst źródłaGavriluţă, Cătălin. "Control and operation of multi-terminal VSC-DC networks". Doctoral thesis, Universitat Politècnica de Catalunya, 2015. http://hdl.handle.net/10803/288217.
Pełny tekst źródłaDurante el siglo pasado, las redes de corriente alterna se han consolidado como la tecnología estándar para los sistemas de transmisión de energía eléctrica. Sin embargo, los sistemas de transmisión en continua se han seguido utilizando en algunas aplicaciones. La capacidad de estos para transmitir mayores potencias a distancias más largas, la posibilidad de interconectar redes asincrónicas, y su alta eficiencia han propiciado que se mantuviera el interés académico, de investigación e industrial en esta tecnología . Aunque históricamente se utilizaron sistemas basados en generadores de continua y válvulas de mercurio para las redes de transmisión, en la década de los 90 todas las instalaciones ya contaban con convertidores conmutados basados en tiristores (LCC). En 1999, se instaló el primer sistema basado en convertidores en fuente de tensión (VSC) en Gotland, Suecia, marcando el comienzo de una nueva era para la transmisión en corriente continua. En los últimos 15 años, la potencia de los sistemas de transmisión en continua basados en VSC ha aumentado desde los 50 hasta los 700 MN, la tensión de servicio de 120 a 500 kV y las distancias recorridas han llegado a ser, en algunos casos, de hasta 950 kilómetros (HVDC-light de ABB en Namibia en 201 O). El trabajo presentado en esta tesis se centra en el control y operación de redes de corriente continua VSC multi-terminal (MTDC). El enfoque propuesto se basa en una arquitectura de control jerárquico, inspirada en la estrategia de control de generación automática aplicada a redes de corriente alterna. En la arquitectura propuesta, el control primario del sistema MTDC está descentralizado e implementado mediante una estrategia de 'droop' generalizada. Más allá del análisis del comportamiento del control primario, esta tesis presenta una metodología para el diseño de los diferentes parámetros que influyen en el mismo. Se destaca la importancia de dimensionar correctamente condensador de salida del VSC, ya que este elemento, cuando se encuentra en el contexto de una red MTDC, se convierte en el elemento inercial de la red y tiene un impacto directo en el comportamiento transitorio de las tensiones. Asimismo, se propone una estrategia de control de 'droop' mejorada que atenúa las oscilaciones de tensión durante los transitorios. En el marco del control jerárquico propuesto, el control secundario está centralizado y regula el punto de funcionamiento de la red de manera que se consigue un flujo de potencia óptimo (OPF). En comparación con otros trabajos, esta tesis lleva a cabo, tanto de forma analítica como a través de simulaciones, un estudio detallado sobre la coordinación entre las capas de control primario y secundario en redes MTDC.
Jimenez, Carrizosa Miguel. "Hierarchical control scheme for multi-terminal high voltage direct current power networks". Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112039/document.
Pełny tekst źródłaThis thesis focuses on the hierarchical control for a multi-terminal high voltage direct current (MT-HVDC) grid suitable for the integration of large scale renewable energy sources. The proposed control scheme is composed of 4 layers, from the low local control at the power converters in the time scale of units of ms; through distributed droop control (primary control) applied in several terminals in the scale of unit of seconds; and then to communication based Model Predictive Control (MPC) that assures the load flow and the steady state voltage/power plan for the whole system, manage large scale storage and include weather forecast (secondary control); finally reaching the higher level controller that is mostly based on optimization techniques, where economic aspects are considered in the same time as longer timespan weather forecast (tertiary control).Concerning the converters' level, special emphasis is placed on DC/DC bidirectional converters. In this thesis, three different topologies are studied in depth: two phases dual active bridge (DAB), the three phases DAB, and the use of the Modular Multilevel Converter (MMC) technology as DC/DC converter. For each topology a specific non-linear control is presented and discussed. In addition, the DC/DC converter can provide other important services as its use as a direct current circuit breaker (DC-CB). Several operation strategies are studied for these topologies used as DC-CB.With respect to primary control, which is the responsible to maintain the DC voltage control of the grid, we have studied several control philosophies: master/slave, voltage margin control and droop control. Finally we have chosen to use droop control, among other reasons, because the communication between nodes is not required. Relative to the secondary control, its main goal is to schedule power transfer between the network nodes providing voltage and power references to local and primary controllers, providing steady state response to disturbances and managing power reserves. In this part we have proposed a new approach to solve the power flow problem (non-linear equations) based on the contraction mapping theorem, which gives the possibility to use more than one bus for the power balance (slack bus) instead of the classic approach based on the Newton-Raphson method. Secondary control plays a very important role in practical applications, in particular when including time varying power sources, as renewable ones. In such cases, it is interesting to consider storage devices in order to improve the stability and the efficiency of the whole system. Due to the sample time of secondary control is on the order of minutes, it is also possible to consider different kinds of forecast (weather, load,..) and to achieve additional control objectives, based on managing storage reserves. All these characteristics encourage the use of a model predictive control (MPC) approach to design this task. In this context, several possibilities of optimization objective were considered, like to minimize transmission losses or to avoid power network congestions.The main task of tertiary control is to manage the load flow of the whole HVDC grid in order to achieve economical optimization. This control level provides power references to the secondary controller. In this thesis we were able to maximize the economic profit of the system by acting on the spot market, and by optimizing the use of storage devices. In this level it is again used the MPC approach.With the aim of implementing the hierarchical control philosophy explained in this thesis, we have built an experimental test bench. This platform has 4 terminals interconnected via a DC grid, and connected to the main AC grid through VSC power converters. This DC grid can work at a maximum of 400 V, and with a maximum allowed current of 15 A
Chen, Yijing. "Nonlinear Control and Stability Analysis of Multi-Terminal High Voltage Direct Current Networks". Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112041/document.
Pełny tekst źródłaThis dissertation was devoted to the study of multi-terminal high voltage direct current (MTDC) networks. The main contributions were in the field of nonlinear automatic control, applied to power systems, power electronics and renewable energy sources. The research work was started with the intention of filling some gaps between the theory and the practice, in particular: 1) to investigate various control approaches for the purpose of improving the performance of MTDC systems; 2) to establish connections between existing empirical control design and theoretical analysis; 3) to improve the understanding of the multi-time-scale behavior of MTDC systems characterized by the presence of slow and fast transients in response to external disturbances. As a consequence, this thesis work can be put into three areas, namely nonlinear control design of MTDC systems, analysis of MTDC system's dynamic behaviors and application of MTDC systems for frequency control of AC systems
Adeuyi, Oluwole Daniel. "Grid connection of offshore wind farms through multi-terminal high voltage direct current networks". Thesis, Cardiff University, 2015. http://orca.cf.ac.uk/90288/.
Pełny tekst źródłaHung-Hush, Tang, i 唐宏勳. "An algorithm for multi-terminal network reliability". Thesis, 1993. http://ndltd.ncl.edu.tw/handle/55685170515347852626.
Pełny tekst źródła國立中興大學
統計學研究所
81
The purpose of this study is to develope a method for calculatingmulti-terminal network reliability. A recursive algorithm is proposed by theDepth First Search(DFS) and the Sum of Disjoint Products Principle (SDP Principle). On this algorithm, All of the possible paths are found andreconstructed into disjoint products. Then the reliability of the multi- terminal network is obtained by evaluating the probability of the disjoint products.Examples of directed graph and undirected graph are both illustrated asapplications of this algorithm.
SU, WEN-MING, i 蘇文明. "The optimal allocation of multi-terminal network reliability with resource constraints". Thesis, 1987. http://ndltd.ncl.edu.tw/handle/68181914972656733582.
Pełny tekst źródłaConforto, P., C. Tocci, V. Schena, l. Secondiani, N. Bielari-Melazzi, Pauline M. L. Chan i Priscolli F. Delli. "End-to-End QoS and Global Mobility Management in an Integrated Satellite/Terrestrial Network". 2004. http://hdl.handle.net/10454/3757.
Pełny tekst źródłaFor decades, the development of the Internet was driven by the purpose of providing applications to non-mobile users. No specific Quality of Service (QoS) requirement is necessary, other than ensuring reliability in the end-to-end data transfers. As such, best effort service model was deemed more than appropriate to satisfy the users' needs. Nevertheless, the scenario has changed in the last few years. A new population of nomadic users, who requires access to Internet services regardless of their location and mode of transportation is growing, while new typologies of Internet applications are being continuously developed, in which best effort service level may no longer be adequate. The SUITED project has been devised to address the emerging issues generated by this new and challenging scenario. SUITED aims at contributing towards the design and deployment of the Global Mobile Broadband System (GMBS), a unique satellite/terrestrial infrastructure, which will ensure that nomadic users have access to Internet services with a negotiated QoS. An overview of the main results achieved in the SUITED project is provided in this article. Some of the most innovative solutions developed by the SUITED team for the joint management of global mobility and end-to-end QoS support are presented. The SUITED demonstrator platform, which was developed to validate the system specifications, is also described. Finally, the results of the experimental measurement campaigns carried out with this platform are reported.
Ong, Eng Hwee. "A generalized cooperative and cognitive radio resource management architecture for future wireless networks". Thesis, 2010. http://hdl.handle.net/1959.13/805169.
Pełny tekst źródłaHeterogeneity and convergence are two distinctive connotations of future wireless networks. Multiple access networks are expected to converge in a manner where heterogeneity can be exploited as an enabler to realize the Optimally Connected, Anywhere, Anytime vision of the International Telecommunication Union (ITU). This stimulates current trends toward the convergence of complementary heterogeneous access networks in an all-internet protocol (IP) core network and raises the importance of cooperation in such a multiple radio access technology (multi-RAT) environment. This thesis defines, develops, implements, and analyzes a novel generalized cooperative and cognitive RRM (CCRRM) architecture, anchored on the key principle of technology agnostic approach, to optimize radio resources usage, maximize system capacity, and improve quality of service (QoS) in future wireless networks. A novel measurement-based network selection technique, formulated based on mathematical framework, and terminal-oriented network-assisted (TONA) handover architecture are the main actors of this technology agnostic approach. In particular, QoS parameters estimation is a cornerstone of the generalized CCRRM architecture to facilitate technology abstraction and provide link layer cognition in an effort to realize seamless mobility in future wireless networks. By leveraging on the cooperative exchange of QoS context information over the converged all-IP core and novel concept of reactive QoS balancing (RQB) to achieve the end-to-end goal of promoting a QoS-balanced system, three RQB algorithms augmented with multi-domain cooperation techniques are developed to exploit the heterogeneity of access networks and distribute load opportunistically. Additionally, the radio resource management (RRM) design of the generalized CCRRM architecture is based on a network-terminal distributed decision making process, similar and compliant to the recent IEEE 1900.4 standard. Performance evaluation is conducted with comprehensive discrete event based simulation studies to gain insights of the promising intrinsic benefits associated with RQB under realistic, pragmatic scenarios. Furthermore, an elegant unified analytical model is developed to obtain the key performance metrics for the IEEE 802.11 distributed coordination function (DCF) infrastructure basic service set (BSS), under non-homogeneous conditions, by integrating a Markov chain model in conjunction with a finite queueing model. These performance metrics serve as bounds for reliable capacity analysis from which a model-based predictive QoS balancing (PQB) algorithm is developed as a benchmark for comparative performance studies with the proposed measurement-based RQB algorithm. The contributions of this thesis are not restricted to multiple access point (multi-AP) wireless local area network (WLAN), and the proof of concept is validated based on a heterogeneous multi-AP WLAN where appropriate. Moreover, conditions under which the generalized CCRRM architecture provides abstraction from underlying technologies and stays relevant to future IP-based multi-RAT environment have been established.
Shyam, V. "Development Of An Application Specific Parallel Processing Real-Time System For MTDC System Control". Thesis, 1996. https://etd.iisc.ac.in/handle/2005/1755.
Pełny tekst źródłaShyam, V. "Development Of An Application Specific Parallel Processing Real-Time System For MTDC System Control". Thesis, 1996. http://etd.iisc.ernet.in/handle/2005/1755.
Pełny tekst źródłaKuo, Chris, i 郭俊良. "Design of Fault Tolerant Multi-Stage Interconnection Networks and A New Method for Terminal Reliability Evaluation". Thesis, 1994. http://ndltd.ncl.edu.tw/handle/74472321080865955153.
Pełny tekst źródła淡江大學
資訊工程研究所
82
The multi-stage interconnection network (MIN) can be employed in a multiprocessor to connect processors and memory modules together . Fault toleance and terminal reliability are two important parameters in performance estimation of MIN. In this research, we consider modifications to the gamma interconnection network (GIN) by altering the interconnection patterns between stages so as to achieve high terminal reliability between any source-destination pair . We obtain a new MIN with better performance without increasing the hardware complexity. This MIN ensures totally disjoint paths in existence from any source to any destination, thereby capable of tolerating an arbitrary single fault. It enjoys higher terminal reliability than GIN, MGIN and REGIN. This research also proposes a new method to calculate terminal reliability for any MIN. It is a path enumeration method in caculating the terminal reliability of computer networks.It uses boolean algebra and probability theory to transfer a boolean product with boolean complement to a sum of disjoint product (SDP) and transfer the SDP form to probability expression of terminal reliability. This method can be used not only in MIN , but also by proper modifing , in any network .In addition, the performance of the new networks is evaluated using simulation.