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EAI International Conference on Wireless Mobile communication and Healthcare (Mobihealth)

作者： Pascal Libuschewski Dennis Kaulbars Björn Dusza Dominic Siedhoff Frank Weichert Heinrich Müller Christian Wietfeld Peter Marwedel Department of Computer Science XII Dortmund TU Dortmund University Germany TU Dortmund University Communication Networks Institute Dortmund Germany Department of Computer Science VII TU Dortmund University Dortmund Germany

For a rapid identification of viral epidemics a mobile virus detection is needed, which can process samples without a laboratory. The application of medical biosensors, at key positions with a high passenger volume (e.g. airports) became increasingly important as epidemic early warning systems. As mobile biosensors have to fulfill various demands, like a rapid analysis and a long battery lifetime, in this study we present a multi-objective computation offloading for mobile sensors. The decision whether it is beneficial to offload work to a server, using the Long Term Evolution (LTE) wireless network, can be made automatically and dynamically on the basis of conflicting objectives and several constraints.

关键词： Graphics processing units Energy consumption Mobile communication Servers Biosensors Viruses (medical)

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Athermal scheme based on resonance splitting for silicon-on-insulator microring resonators

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Photonics Research 2014年第2期2卷 71-74页

作者： Qingzhong Deng Xinbai Li Zhiping Zhou Huaxiang Yi State Key Laboratory of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer SciencePeking UniversityBeijing 100871China Xi’an Flight Automatic Control Research Institute Aviation Industries of China(AVIC)Xi’an 710065China

A novel athermal scheme utilizing resonance splitting of a dual-ring structure is *** design and simulation are presented,and a proof of concept structure is optimized to demonstrate an athermal resonator with resonan... 详细信息

关键词： splitting scheme resonance

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Self-Organization Approaches for Optimization in Cognitive Radio networks

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China communications 2014年第4期11卷 121-129页

作者： XU Xu CHAI Xiaomeng ZHANG Zhongshan School of Computer & Communication Engineering and Beijing Engineering and Technology Center for Convergence Networks and Ubiquitous Services University of Science and Technology Beijing (USTB) No.30 Xueyuan Road Haidian District Beijing 100083 China National Mobile Communications Research Laboratory Southeast University Nanjing 210096 China

Cognitive radio(CR) is regarded as a promising technology for providing a high spectral efficiency to mobile users by using heterogeneous wireless network architectures and dynamic spectrum access ***,cognitive radio networks(CRNs)may also impose some challenges due to the ever increasing complexity of network architecture,the increasing complexity with configuration and management of large-scale networks,fluctuating nature of the available spectrum,diverse Quality-of-Service(QoS)requirements of various applications,and the intensifying difficulties of centralized control,*** management functions with self-organization features can be used to address these challenges and realize this new network *** this paper,fundamentals of CR,including spectrum sensing,spectrum management,spectrum mobility and spectrum sharing,have been surveyed,with their paradigms of self-organization being *** aspects of selforganization paradigms in CRNs,including critical functionalities of Media Access Control(MAC)- and network-layer operations,are surveyed and ***,new directions and open problems in CRNs are also identified in this survey.

关键词： cognitive radio self-organized networking heterogeneous machine-to-machine decentralized load balancing cooperation.

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Does Amplify-and-Forward Cooperative Relay Improve OFDM/OFDMA Ergodic Capacity？

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China communications 2014年第2期11卷 83-89页

作者： HUANGFU Wei ZHANG Zhongshan ZHANG Dandan LONG Keping School of Computer and Communication Engineering Beijing Engineering and Technology Center for Convergence Networks andUbiquitous Services University of Science and Technology Beijing (USTB) No. 30Xueyuan Road Haidian District Beijing China 100083 National Mobile Communications Research Laboratory Southeast University Nanjing China 210096

The ergodic information rate for Orthogonal Frequency-Division Multiplexing / Orthogonal Frequency-Division Multiple Access with amplify-and-forward （AF） relaying systems in the presence of frequency offsets is evaluated. Unlike previous work, per-subcarrier adaptive power allocation is performed on each relay to optimize the system ergodic information rate. For a given frequency offset and total number of relays M, the AF ergodic information rate is proven to be a monotonically increasing function of α （the ratio of the power allocated to the source node and the total transmit power）, implying that the maximum ergodic information rate can be obtained at α=1 （i.e., there is no cooperative relay）. Furthermore, the proof of ＂cooperative relays cannot improve the AF ergodic information rate in a quasi-static wireless channel＂ is also provided in this letter.

关键词： cooperation amplify-ano-forward （AF） ergodic information rate frequency offset Orthogonal Frequency-Division Multiplexing （OFDM） OrthogonalFrequency-Division Multiple Access（OFDMA）

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A novel approach for symbol timing estimation based on the extended zero-crossing property

A novel approach for symbol timing estimation based on the e...

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Advanced Satellite Mobile Systems (ASMS)

作者： Wilfried Gappmair Stefano Cioni Giovanni E. Corazza Otto Koudelka Institute of Communication Networks and Satellite Communications Graz University of Technology Austria ESA/ESTEC Noordwijk European Space Agency Netherlands Department of Electronics Computer Science and Systems University of Bologna Italy

Carrier- and data-blind recovery of the symbol timing is of paramount importance in digital receivers, i.e., detailed knowledge about carrier frequency and phase or any pilot sequences is not necessary for proper operation. In this context, feedforward algorithms are particularly useful in packet-oriented systems, where rapid and stable acquisition of the major transmission parameters is essential for subsequent processing stages. In the current paper, we propose a novel approach for blind estimation of the symbol timing, which needs just one or two samples per symbol. The new method is characterized by introducing a second filter in parallel to the receiver matched filter. Under Nyquist conditions, this filter exhibits an impulse response satisfying the extended zero-crossing property, i.e., it vanishes for all integer multiples of the symbol period, including the origin! Using this idea for a suitably designed timing estimator, it is shown that the annoying jitter floor - typical for most timing estimators and caused by pattern noise - can be avoided.

关键词： Jitter Timing Matched filters Receivers Floors Signal to noise ratio

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Reliable Crossing of Signals in Asynchronous Cellular Automata

Reliable Crossing of Signals in Asynchronous Cellular Automa...

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International Symposium on Computing and Networking (CANDAR)

作者： Tai-Ran He Guo-Long Li Jia Lee Ferdinand Peper College of Computer Science Chongqing University Chongqing China College of Mechanical Engineering Chongqing University Chongqing China Brain Networks and Communication Laboratory National Institute of Information and Communications Technology Osaka Japan

The embedding of logic circuits into the cellular spaces is an essential approach for efficient computing on asynchronous cellular automata (ACAs), which usually depends critically on the design of signals. Such signals are required to propagate definitely in predefined directions, and cross other signals coming from orthogonal directions without blockage. Adachi et al. (2004) constructed signals in an ACA with von Neumann neighborhood, which takes 5 states per cell and 24 transition rules. Unfortunately, two signals colliding with each other at the crossing point of paths may occasionally cause deadlock, due to the lack of adequate rules to cope with such a situation. This paper presents a novel 5-state ACA with von Neumann neighborhood that uses 64 rules, which allows reliable propagation and crossing of signals at all times.

关键词： Automata Educational institutions Finite element analysis Arrays Presses Integrated circuit reliability

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Realization of population inversion between 7S_(1/2) and 6P_(3/2) levels of cesium for four-level active optical clock

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science China(Physics,Mechanics & Astronomy) 2013年第6期56卷 1107-1110页

作者： WANG YanFei WANG DongYing ZHANG TongGang HONG YeLong ZHANG ShengNan TAO ZhiMing XIE XiaoPeng CHEN JingBiao State Key Laboratory of Advanced Optical Communication Systems and Networks Institute of Quantum ElectronicsSchool of Electronics Engineering & Computer SciencePeking University

We demonstrate experimentally the population inversion between 7S1/2 and 6P3/2 levels of cesium in thermal cesium cell with a 455.5 nm pumping *** calculate the relative population probabilities at each level theoretically with the density matrix *** a steady state,5.8% atoms are at 7S1/2 level and 2.9% at 6P3/2 level,which builds up the population inversion between the two *** obtain the fluorescence spectra produced in thermal cesium cell in our *** measured relative intensity of each available fluorescence spectral line in the experiment agrees very well with the theoretical *** demonstrated population inversion between 7S1/2 and 6P3/2 levels can be used to construct an active optical clock of four-level system with a wavelength of 1469.9 nm.

关键词： active optical clock four-level system population inversion

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A simulation model to analyze the residual load during the extension of highly fluctuating renewables in Bavaria, Germany

A simulation model to analyze the residual load during the e...

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2013 4th International Conference on Power Engineering, Energy and Electrical Drives, POWERENG 2013

作者： Pruckner, Marco German, Reinhard Computer Networks and Communication Systems Dept. of Computer Science University of Erlangen-Nuremberg Germany

ISBN: (纸本)9781467363921

Globally, electric energy systems are faced with great challenges due to the massive growth of electricity generated by renewable energy sources. The situation in Germany is even more pronounced because of the planned phase-out of nuclear energy. The high penetration of volatile decentralized renewables such as wind and solar energy contributes to a shift of the electric energy system. The present legally guaranteed priority over conventional power plants leads to a change of the characteristics of the residual load - defined as the difference between electricity demand and the amount supplied by renewables. In order to predict various system aspects with adequate accuracy, we developed a flexible, validated, and efficient simulation model. In this paper, we describe our model and apply it to investigate the properties of the residual load based on the electric energy system of the German federal state Bavaria. The simulation results show that the mean of the residual load will decline whereas the hours of negative residual load will increase over the next ten years. © 2013 IEEE.

关键词： Solar energy

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Large scale healthcare modeling by hybrid simulation techniques using AnyLogic 6

Large scale healthcare modeling by hybrid simulation techniq...

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6th International Conference on Simulation Tools and Techniques, SIMUTools 2013

作者： Djanatliev, Anatoli German, Reinhard Computer Networks and Communication Systems Department of Computer Science 7 University of Erlangen-Nuremberg Germany

ISBN: (纸本)9781936968763

In contrast to already established tools for health technology assessments, Prospective Health Technology Assessment (ProHTA) uses hybrid simulation techniques to make early predictions about the effects of new healthcare innovations. In such studies, it is necessary to consider problems at high abstraction levels, as well as at detailed microscopic levels. According to the diversity of expected output metrics and the lack of medical evidence, the situation can be compared to other large scale and complex simulation problems. In such cases well-known modeling methods are often not sufficient to use. Therefore, advanced modeling and simulation techniques have to be developed and properly applied. This paper describes a methodical and practical approach of hybrid model creation using the simulation tool AnyLogic. We focus on general modeling aspects and on advanced techniques using a Level-Based Architecture that help to develop large scale hybrid simulation models. An implementation of a stroke therapy use-case and its simulation results will be discussed. Finally, some practical ideas for validation will be outlined, as we experienced during the stroke use-case development. Copyright © 2013 ICST.

关键词： Health care

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Assessing effect sizes of influence factors towards a QoE model for HTTP adaptive streaming

Assessing effect sizes of influence factors towards a QoE mo...

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International Workshop on Quality of Multimedia Experience, QoMEx

作者： Tobias Hoßfeld Michael Seufert Christian Sieber Thomas Zinner Julius-Maximilians-Universitat Wurzburg Wurzburg Bayern DE University of Würzburg Institute of Computer Science Würzburg Germany Technische Universität München Institute for Communication Networks Munich Germany

HTTP Adaptive Streaming (HAS) is employed by more and more video streaming services in the Internet. It allows to adapt the downloaded video quality to the current network conditions, and thus, avoids stalling (i.e., playback interruptions) to the greatest possible extend. The adaptation of video streams is done by switching between different quality representation levels, which influences the user perceived quality of the video stream. In this work, the influence of several adaptation parameters, namely, switch amplitude (i.e., quality level difference), switching frequency, and recency effects, on Quality of Experience (QoE) is investigated. Therefore, crowdsourcing experiments were conducted in order to collect subjective ratings for different adaptation-related test conditions. The results of these subjective studies indicate the influence of the adaptation parameters, and based on these findings a simplified QoE model for HAS is presented, which only relies on the switch amplitude and the playback time of each layer.

关键词： Switches Streaming media Crowdsourcing Video recording Quality assessment Time-frequency analysis Bars

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