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Modelo de Decisión Espectral Colaborativo para Redes de Radio Cognitiva
La decisión espectral es un aspecto clave para mejorar el desempeño en las redes de radio cognitiva descentralizadas. Los usuarios secundarios deben tomar decisiones inteligentes en función de la variación del espectro y de las acciones adoptadas por otros usuarios secundarios. A partir de esta dinámica, la probabilidad de que dos o más usuarios secundarios elijan el mismo canal es alta, especialmente cuando el número de usuarios secundarios es mayor que el número de canales disponibles, debido a la externalidad negativa de la red; cuantos más usuarios secundarios seleccionen el mismo canal, menor será la utilidad que cada usuario secundario pueda obtener y el número de interferen...
Modelo de asignación espectral multiusuario para redes de radio cognitiva descentralizadas
El crecimiento de las aplicaciones inalámbricas plantea nuevos desafíos a los futuros sistemas de comunicación, como el uso ineficiente del espectro radioeléctrico. Las redes de radio cognitiva surgen como una solución a los problemas de escasez de espectro y uso ineficiente del recurso espectral, mediante el acceso dinámico al espectro. Estas redes están caracterizadas por percibir, aprender, planificar (toma de decisiones) y actuar de acuerdo con las condiciones actuales de la red. El objetivo general de una red de radio cognitiva consiste en que el usuario secundario acceda de manera oportuna a un canal de frecuencia disponible en una banda licenciada, sin generar interferencia al ...
Modelo adaptativo multivariable de handoff espectral para incrementar el desempeño en redes móviles de radio cognitiva
El handoff espectral, en las redes de radio cognitiva, ocurre cuando el usuario secundario debe dejar el canal de frecuencia que está utilizando y continuar su comunicación en otra oportunidad espectral. Este proceso es un aspecto clave para garantizar una adecuada calidad de servicio y mejorar el desempeño en las comunicaciones del usuario secundario. Este libro de investigación tiene por objetivo presentar una propuesta de modelo adaptativo multivariable de handoff espectral para redes móviles de radio cognitiva. Para lo anterior, se desarrollaron tres algoritmos para la toma de decisiones durante un handoff espectral, con diferentes enfoques: difuso, realimentado y predictivo; estos ...
Flujo de potencia en redes de distribución – 1ra edición
Este libro presenta nueve metodologías para la solución del problema de flujo de potencia en redes de distribución de energía con modelado monofásico. Los métodos numéricos desarrollados se dividen en metodologías libres de derivadas y metodologías basadas en derivadas, cuya característica principal es asociada a la tasa de convergencia que, para el primer caso, presenta una tendencia lineal, mientras que para el segundo caso presenta una convergencia cuadrática. Cada una de las metodologías de flujo de potencia se valida mediante el desarrollo de rutinas computacionales implementadas en el entorno de programación del software MATLAB®, lo cual hace de esta obra un libro autocon...
Selected Applications of Convex Optimization
This book focuses on the applications of convex optimization and highlights several topics, including support vector machines, parameter estimation, norm approximation and regularization, semi-definite programming problems, convex relaxation, and geometric problems. All derivation processes are presented in detail to aid in comprehension. The book offers concrete guidance, helping readers recognize and formulate convex optimization problems they might encounter in practice.
Cognitive Wireless Networks
This book advocates the idea of breaking up the cellular communication architecture by introducing cooperative strategies among wireless devices through cognitive wireless networking. It details the cooperative and cognitive aspects for future wireless communication networks. Coverage includes social and biological inspired behavior applied to wireless networks, peer-to-peer networking, cooperative networks, and spectrum sensing and management.
IEC 61131-3: Programming Industrial Automation Systems
The rapid advances in performance and miniaturisation in microtechnology are constantly opening up new markets for the programmable logic controller (PLC). Specially designed controller hardware or PC-based controllers, extended by hardware and software with real-time capability, now control highly complex automation processes. This has been extended by the new subject of “safe- related controllers”, aimed at preventing injury by machines during the production process. The different types of PLC cover a wide task spectrum - ranging from small network node computers and distributed compact units right up to modular, fau- tolerant, high-performance PLCs. They differ in performance characteristics such as processing speed, networking ability or the selection of I/O modules they support. Throughout this book, the term PLC is used to refer to the technology as a whole, both hardware and software, and not merely to the hardware architecture. The IEC61131 programming languages can be used for programming classical PLCs, embedded controllers, industrial PCs and even standard PCs, if suitable hardware (e.g. fieldbus board) for connecting sensors and actors is available.
Information Technology and Systems
This book is composed by the papers accepted for presentation and discussion at The 2019 International Conference on Information Technology & Systems (ICITS'20), held at the Universidad Distrital Francisco José de Caldas, in Bogotá, Colombia, on 5th to 7th February 2020. ICIST is a global forum for researchers and practitioners to present and discuss recent findings and innovations, current trends, professional experiences and challenges of modern information technology and systems research, together with their technological development and applications. The main topics covered are: information and knowledge management; organizational models and information systems; software and systems modelling; software systems, architectures, applications and tools; multimedia systems and applications; computer networks, mobility and pervasive systems; intelligent and decision support systems; big data analytics and applications; human–computer interaction; ethics, computers & security; health informatics; information technologies in education.
Disjunctive Programming
Disjunctive Programming is a technique and a discipline initiated by the author in the early 1970's, which has become a central tool for solving nonconvex optimization problems like pure or mixed integer programs, through convexification (cutting plane) procedures combined with enumeration. It has played a major role in the revolution in the state of the art of Integer Programming that took place roughly during the period 1990-2010. The main benefit that the reader may acquire from reading this book is a deeper understanding of the theoretical underpinnings and of the applications potential of disjunctive programming, which range from more efficient problem formulation to enhanced modeling capability and improved solution methods for integer and combinatorial optimization. Egon Balas is University Professor and Lord Professor of Operations Research at Carnegie Mellon University's Tepper School of Business.
Rodent Model as Tools in Ethical Biomedical Research
The objective of this book is to concisely present information with respect to appropriate use of experimental rodents in research. The principles elaborated seek to provide knowledge of the techniques involved in both management and scientific research to all who use laboratory animals, with a focus on the well-being and ethics regarding rodents and also to fortify the awareness of the importance of the animal as a study object and to offer orientation and assistance in conducting laboratory research, education or tests.
