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A Scalable Iterative Convex Design for Nonlinear Systems

A Scalable Iterative Convex Design for Nonlinear Systems

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American Control Conference

作者： Simone Baldi Petros A. Ioannou Elias B. Kosmatopoulos Computer Science Department University of Cyprus (UCY) 1678 Nicosia Cyprus Department of Electrical Engineering University of Southern California Los Angeles CA USA Dept. of Electrical and Computer Engineering Democritus University of Thrace Xanthi Greece and the Informatics & Telematics Institute Center for Research and Technology Hellas (ITICERTH) Thessaloniki Greece

ISBN: (纸本)9781457710957

A recently developed control scheme for approximately optimal control of nonlinear systems is the so-called Convex Control Design (ConvCD) methodology, that transforms the control problem of generic nonlinear systems into a convex optimization problem. The ConvCD approach constructs a polynomial controller approximating the optimal control law: such design does not provide a scalable controller as it requires the use of a polynomial controller, which is not scalable, especially in large-scale applications. This problem is overcome in this paper by modifying the ConvCD formulation so that the optimal control law is approximated with a Multi-Controller with Mixing: that is, the polynomial controller is substituted by linear control elements plus mixing signals that are responsible for smoothly switching from one linear element to another. The stability properties of the Multi-Controller with Mixing are analyzed and an iterative approach is proposed to solve the resulting optimization problem. The resulting procedure aims at the development of a scalable and modular architecture for nonlinear systems, in order to allow for easier implementation and re-configurability. A numerical example is used to show the effectiveness of the method.

关键词： Nonlinear systems Scalability Optimal control control law Mixing Blending Controllers Convexity Iterative Polynomial

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Optimized Path Selection Mechanism for IEEE 802.16j Multi-hop Relay Networks

Optimized Path Selection Mechanism for IEEE 802.16j Multi-ho...

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IEEE International Conference on Communications

作者： Jian-Ming Chang Chin-Feng Lai Han-Chieh Chao Jiann-Liang Chen Dept. of Computer Science Information Engineering National Dong Hwa University Inst. of Computer Science Information Engineering National Ilan University Dept. of Electrical Engineering National Taiwan University of science and Technology

ISBN: (纸本)9781457720529

When the mobile station (MS) is far away from the base station (BS) or terrain and buildings interfere with transmission, the data rate decreases with the increased distance from the BS, and the coverage range of the BS will be shortened to only a few kilometers. The IEEE Working Group has proposed the 802.16j relay technology. This technology can be used to forward data for a BS while overcoming the signal strength attenuation. Since the cost of constructing the relay station is low, the MS will have to scan more than one signal when entering the Mobile Multi-Hop Relay (MMR) network. In this paper, we introduce a novel path selection mechanism that exploits the remaining slot and signal strength indicator (SSI). Since the signal strength will affect the Modulation and Coding Scheme (MCS) combination, we propose to use SSI integrated with the MCS, taking the hop count into account. We demonstrate that our proposed scheme is capable of producing an optimal path selection.

关键词： Path selection 802.16j OFDMA Modulation and Coding Scheme (MCS)

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Wireless myths, realities, and futures: From 3G/4G to optical and quantum wireless

Wireless myths, realities, and futures: From 3G/4G to optica...

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作者： Hanzo, Lajos Haas, Harald Imre, Sndor O'Brien, Dominic Rupp, Markus Gyongyosi, Laszlo School of Electronics and Computer Science University of Southampton Southampton SO17 1BJ United Kingdom University of Edinburgh Edinburgh EH9 3JL United Kingdom Telecommunications Dept. Budapest University of Technology and Economics Budapest 1521 Hungary Department of Engineering Science University of Oxford Oxford OX1 3PJ United Kingdom Technische Universitt Wien Institute of Telecommunications Wien A-1040 Austria Faculty of Electrical Engineering and Informatics Department of Telecommunications Budapest University of Technology and Economics Budapest 1521 Hungary

The Myth: Sixty years of research following Shannon's pioneering paper has led to telecommunications solutions operating arbitrarily close to the channel capacityflawless telepresence with zero error is available ... 详细信息

关键词： Quantum communication

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On formal models for cognitive linguistics

On formal models for cognitive linguistics

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IEEE International Conference on Cognitive informatics

作者： Yingxu Wang Robert C. Berwick International Institute of Cognitive Informatics and Cognitive Computing (ICIC) University of Calgary Calgary Alberta Canada T2N 1N4 Dept. of Brain and Cognitive Science & Dept. Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA 02139 USA

Cognitive linguistics is an emerging discipline that studies the cognitive properties of natural languages and the cognitive models of languages in computational linguistics, cognitive computing, and computational intelligence. This paper presents the theoretical framework of cognitive linguistics in order to systematically formalize the syntaxes and grammars of natural languages. An abstract language model of cognitive linguistics is created at the top level. Based on it, the cognitive structures of languages at the levels of lexis, phrase, clauses, sentence, paragraph, and essay are formally modeled from the bottom up. Using contemporary denotational mathematics, the deductive grammar of English is formally modeled and rigorously analyzed. The basic research provides support for a wide range of applications in computational linguistics, cognitive informatics, online text processing, web search engines, machine language comprehension, autonomous machine learning, smart cell phones, semantic computing, and computing with words.

关键词： Grammar Semantics Pragmatics Computational modeling Natural languages Speech Mathematical model

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Normal Algorithmetic Implementation of Cellular Automata

Normal Algorithmetic Implementation of Cellular Automata

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International Conference on Computing Sciences (ICCS)

作者： G. Ramesh Chandra V. Dhana Lakshmi E.G. Rajan Department of Computer Science and Engineering VNR Vignana Jyothi Institute of Engineering and Technology Hyderabad India Dept. of Comput. Sci. & Eng. VNR Vignana Jyothi Inst. of Eng. & Technol. Hyderabad India Pentagram Research Center Private Limited Hyderabad India

Markov's Normal Algorithms are idealized sequential machines. Von Neumann's Cellular Automata are idealized parallel processing machines. This paper introduces a state-of-the-art of realizing cellular automata... 详细信息

关键词： Automata Arrays Lattices Image edge detection Automation Markov processes

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A Direct AC LED Driver with High Power Factor without the use of Passive Components

A Direct AC LED Driver with High Power Factor without the us...

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IEEE Energy Conversion Congress and Exposition

作者： Rohan Dayal Kumar Modepalli Leila Parsa Dept. of Electrical Computer & Systems Engineering Rensselaer Polytechnic Inst.Troy NY USA 12180 Dept. of Electrical Computer & Systems Engineering Rensselaer Polytechnic Inst. Troy NY USA 12180

ISBN: (纸本)9781467308021

In this paper, a novel driver for high brightness LED applications that can directly run from AC voltage is presented. Conventional LED drivers for such applications consist of switching-type converters which require passive components like high value inductors and electrolytic capacitors for their operation. The use of such components increases the size and cost of the LED system while decreasing the overall life time. The proposed circuit only needs active devices like MOSFETs and op-amps for power processing. The input current is selectively controlled to follow a sinusoidal waveform to achieve low harmonic distortion and high power factor. A simple start-up circuit is also designed for selfsufficient operation with a more efficient set-up under development. The efficiency of the proposed system is around 82% for a 1.5W converter with 9% total harmonic distortion. Such an implementation is also more suitable for IC design. Both simulation and experimental results have been presented to validate the operation of the proposed set-up.

关键词： driver brightness proposed

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Optimal Dedicated Protection Approach to Shared Risk Link Group Failures using Network Coding

Optimal Dedicated Protection Approach to Shared Risk Link Gr...

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IEEE International Conference on Communications

作者： Peter Babarczi Janos Tapolcai Pin-Han Ho Muriel Medard Dept. of Telecommunications and Media Informatics Budapest University of Technology and Economics Dept. of Electrical and Computer Engineering University of Waterloo Research Laboratory of Electronics Massachusetts Institute of Technology

ISBN: (纸本)9781457720529

Survivable routing serves as a key role in connection-oriented communication networks for achieving desired service availability for each connection. This is particularly critical for the success of all-optical mesh networks where each lightpath carries a huge amount of data. Currently, 1 + 1 dedicated path protection appears to be the most widely deployed network resilience mechanism because it offers inst.ntaneous recovery from network failures. However, 1 + 1 protection consumes almost twice as much capacity as required, which imposes a stringent constraint on network resource utilization. In addition, finding an SRLG-disjoint path is essential for 1 + 1 protection, which is nonetheless subject to non-trivial computation complexity and may fail in some SRLG scenarios. To address these problems, we introduce a novel framework of 1 + 1 protection, called Generalized Dedicated Protection (GDP), for achieving inst.ntaneous recovery from any SRLG failure event. It is demonstrated, that finding a non-bifurcated optimal solution for GDP is NP-complete. Thus, the paper presents a novel scheme applying Generalized Dedicated Protection and Network Coding (GDP-NC) to ensure both optimal resource utilization among dedicated protection approaches and inst.ntaneous recovery for single unicast flows, which can be split into multiple parts in all-optical networks. We demonstrate that the proposed GDP-NC survivable routing problem is polynomial-time solvable, owing to the ability to bifurcate flows. This flexibility comes at the expense of additional hardware for linear combination operations for the optical flows.

关键词： Network coding Robustness Economic indicators Routing Optical fiber networks Unicast Bandwidth

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Spatio-Temporal Estimation for Interference Management in Femtocell Networks

Spatio-Temporal Estimation for Interference Management in Fe...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： David M. Gutierrez-Estevez Berk Canberk Ian F. Akyildiz Broadband Wireless Network Laboratory School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta Georgia 30332 USA. Dept. of Computer Engineering Computer and Informatics Faculty Istanbul Technical University Ayazaga 34469 Istanbul-Turkey

ISBN: (纸本)9781467325660

Two-tier femtocell-based networks have been proposed as an economic solution to improve coverage and capacity in wireless cellular systems. Although widely studied in the literature, interference management in these networks remains as a technical challenge in need of effective solutions. In particular, the interference estimation is a relevant portion of the problem that enables correct operation of interference management schemes relying on this information. In this paper, a novel downlink cross-tier interference estimation approach is proposed based on spatio-temporal correlation techniques. An ordinary Kriging interpolator using Semivariogram Analysis is applied to the interfering signal followed by an autorregressive model. The signal estimation at the interfered users' location is exploited at the radio resource manager of the femtocell or macrocell base station by formulating a resource allocation problem that is solved by means of a heuristic algorithm. A practical procedure implementing this scheme in the network is also proposed. Numerical results show how performance of crosstier interference management approaches can be optimized by implementing this idea.

关键词： Spatio-Temporal correlation techniques Two-tier

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Optimizing the combination of MBSFN and PTM transmissions in LTE systems

Optimizing the combination of MBSFN and PTM transmissions in...

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10th Annual Wireless Telecommunications Symposium, WTS 2011

作者： Alexiou, Antonios Bouras, Christos Kokkinos, Vasileios Papazois, Andreas Tseliou, Georgia Research Academic Computer Technology Institute Patras Greece Computer Engineering and Informatics Dept. Univ. of Patras Greece

ISBN: (纸本)9781457701627

The 3rd Generation Partnership Project (3GPP) has introduced the evolved Multimedia Broadcast/Multicast Service (e-MBMS) feature for cellular systems as an evolution to the existing MBMS service. To support e-MBMS in Long Term Evolution (LTE) systems, 3GPP recommends the use of Point-to-Multipoint (PTM) transmissions and MBMS over a Single Frequency Network (MBSFN). MBSFN is a new feature where a time-synchronized common waveform is transmitted from multiple cells. In this paper we investigate the provision of MBMS service over a combination of MBSFN and PTM transmission methods. A cost analysis of the MBMS service is presented based on the transmission cost over all the interfaces and nodes of the LTE architecture. We evaluate the performance of this transmission scheme from telecommunication cost perspective and we compare it with other transmission schemes. The performance evaluation has been performed with the aid of a new simulation tool that estimates the cost for the MBMS provision under different network topologies, MBSFN deployments and user distributions. © 2011 IEEE.

关键词： Network topology

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GRAL: A grouping algorithm to optimize application placement in wireless embedded systems

GRAL: A grouping algorithm to optimize application placement...

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25th IEEE International Parallel and Distributed Processing Symposium, IPDPS 2011

作者： Tziritas, Nikos Loukopoulos, Thanasis Lalis, Spyros Lampsas, Petros Center for Research and Technology Thessaly Volos Greece Dept. of Computer and Communication Engineering Univ. of Thessaly Volos Greece Dept. of Informatics and Computer Technology TEI of Lamia Lamia Greece

ISBN: (纸本)9780769543857

Recent embedded middleware initiatives enable the structuring of an application as a set of collaborating agents deployed in the various sensing/actuating entities of the system. Of particular importance is the incurred cost due to agent communication which in terms depends on agent positions in the system. In this paper we present GRAL a grouping algorithm that migrates groups of agents with the aim of minimizing communication. The algorithm works in a distributed fashion based on knowledge available locally at each node and can be used both for one-shot initial application deployment and for the continuous updating of agent placement. Through simulation experiments under various scenarios we evaluate the algorithm, comparing the solution quality reached against.the optimal obtained from exhaustive search. © 2011 IEEE.

关键词： Embedded systems

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