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A g-band dielectric waveguide WGM resonator based on Silicon-On-Glass technology

A g-band dielectric waveguide WGM resonator based on Silicon...

European (Formerly European Gallium Arsenide and Other Semiconductors Application Symposium - EGASS) Microwave Integrated Circuit Conference (EuMIC)

作者： Aidin Taeb Suren Gigoyan Gholamreza Rafi Safieddin Safavi-Naeini Mohammed Basha Electrical and Computer Engineering Department University of Waterloo Waterloo Canada Electrical Engineering Department Center for Sensor Network and Cellular Systems (SNCS) University of Tabuk Tabuk Saudi Arabia

A low-complexity/low-cost Whispering Gallery Mode (WGM) resonator coupled to a dielectric waveguide, working in sub-millimeter wave range of frequency, is proposed. The structure is implemented on a Silicon-On-Glass (SOG) technology for the first time. Using different type of experiments, the validity of design and functionality of system are verified. Excitation of four pure WGE modes in the range of 145-205 GHz for two types of resonators, the ring and the disc resonator, are experimentally demonstrated for the first time.

关键词： Dielectrics Resonant frequency Dielectric measurement Optical ring resonators Silicon Electromagnetic waveguides Scattering parameters

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Quasi-Sliding Mode Control for a Class of Multivariable Discrete Time Bilinear systems

Quasi-Sliding Mode Control for a Class of Multivariable Disc...

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IEEE International Conference on systems, Man, and Cybernetics

作者： Chung-Chun Kung Ti-Hung Chen Wen-Cheng Chen Jui-Yiao Su Department of Electrical Engineering Tatung University Department of Computer Information and Network Engineering Lunghwa University of Science and Technology Mechanical & Systems Research Laboratories Industrial Technology Research Institute

ISBN: (纸本)9781467317139

In this paper, we adopt the two quasi-sliding mode control for a class of multivariable discrete time bilinear systems. By applying the proposed control strategies, the system states would move into a boundary layer of the sliding surface and remain in the boundary layer in finite time. Thus, the stability of the overall system could be guaranteed. Finally, the computer simulation is applied to illustrate the control performance of the proposed control strategies.

关键词： Quasi-sliding mode control Multivariable discrete time system Bilinear systems Variable structure systems boundary layer bilinear systems discrete-time control performance control strategy Multivariable Slip surfaces computer Simulation Standing Orders

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A Broadcast Streaming Method over Ad Hoc networks Enabling High Packet Reachability and Long Battery Lifetime

A Broadcast Streaming Method over Ad Hoc Networks Enabling H...

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Asia-Pacific Symposium on Information and Telecommunication Technologies (APSITT)

作者： Keisuke Utsu Hiroshi Sano Hiroaki Nishikawa Hiroshi Ishii Department of Communication and Network Engineering School of Information and Telecommunication Engineering Tokai University Tokyo Japan Department of Computer Science Graduate School of Systems and Information Engineering University of Tsukuba Ibaraki Japan

This paper considers cases where a specific number of nodes in an ad hoc network broadcast video and audio streams over the entire network. For the purpose, we have proposed Load and Battery Charge oriented Flooding (LBF), which reduces degradation in delivery quality, and energy consumption, and prevents nodes from being interrupted due to the complete discharge of their batteries. This paper describes an evaluation of the proposed method through network simulation. The simulation results indicate that the proposed method can prolong network running time without degradation of delivery quality.

关键词： Batteries Streaming media Radiation detectors Floods Ad hoc networks Simulation Degradation

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Comparison of Data Forwarding Mechanisms for AMI networks

Comparison of Data Forwarding Mechanisms for AMI Networks

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IEEE PES Innovative Smart Grid Technologies

作者： Sandra Cespedes Alvaro A. Cardenas Tadashige Iwao Department of Electrical and Computer Engineering University of Waterloo Trusted Systems Innovation Group Fujitsu Laboratories of America Smart Network Division Fujitsu Limited

ISBN: (纸本)9781457721588

Advance Metering Infrastructure (AMI) networks are often deployed under challenging and unreliable conditions. One of the issues for the transmission of data packet in these unreliable networks is the routing of packets, because routing paths may behave differently from the time when the route is discovered to the time when a data packet is forwarded. In addition, control packets may get lost and give routers an inconsistent view of the network. While previous research has focused on designing the control-plane of routing protocols to deal with the AMI network conditions, there is comparatively a smaller amount of research on the advantages of new data forwarding mechanisms designed for unreliable networks. This paper introduces a set of data forwarding mechanisms inspired by distributed depth-first search algorithms, and designed for the challenging conditions of large-scale unreliable networks envisioned by smart-grid deployments. These forwarding mechanisms use data packets to detect loops, update routing tables, and perform rerouting of data packets through alternate paths, recovering thus, packets that would have been normally dropped due to failures at the link layer. We perform simulations based on a real field AMI deployment to evaluate the performance of the proposed mechanisms. We also provide the evaluation results for the data forwarding mechanisms that have been implemented in a real AMI network.

关键词： AMI networks Data forwarding Depth first search Routing Smart grid

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A lightweight privacy preserving approach for analyzing communication records to prevent voip attacks using toll fraud as an example

A lightweight privacy preserving approach for analyzing comm...

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11th IEEE International Conference on Trust, Security and Privacy in Computing and Communications, TrustCom-2012

作者： Hofbauer, Stefan Beckers, Kristian Quirchmayr, Gerald Sorge, Christoph Network Department Danube Data Center GmbH Vienna Austria Software Engineering Paluno University of Duisburg-Essen Dusiburg Germany Multimedia Information Systems Research Group University of Vienna Vienna Austria School of Computer and Information Security University of South Australia Adelaide SA Australia Security in Networks University of Paderborn Paderborn Germany

ISBN: (纸本)9780769547459

Voice-over-IP systems are quite frequently attacked with the intent of service theft. While VoIP security has been intensively researched in the past, devised solutions often demand significant changes to the VoIP systems. In addition, several solutions propose the filtering of telephone calls, but these solutions only have a limited focus on the privacy rights of the call participants. We propose a method for analyzing communication records with the primary purpose to prevent VoIP attacks. Moreover, our approach integrates with little effort into common VoIP usage scenarios. As an example we use the prevention of toll-fraud attacks as a running example. The analysis of the communication records, however, requires investigating personal information in the communication records, e.g., call habits and phone numbers. Consequently we give an overview of major US and EU laws and regulations to elicit privacy requirements. We also demonstrate how these requirements can be implemented using Comercial-Off-The-Shelf VoIP systems. © 2012 IEEE.

关键词： Voice/data communication systems

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Design of Predistorter Using Measured Nonlinear Characteristics of Power Amplifier with Memory Effect

Design of Predistorter Using Measured Nonlinear Characterist...

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IEEE Conference on Vehicular Technology (VTC)

作者： Yasuyuki Oishi Shigekazu Kimura Daisuke Takago Yoshimasa Daido Kiyomichi Araki Eisuke Fukuda Takeshi Takano Network Systems Laboratories Fujitsu Laboratories Limited Kanagawa Japan Division of Information and Computer Science Kanazawa Institute of Technology Ishikawa Japan Department of Electrical and Electronic Engineering Tokyo Institute of Technology Tokyo Japan

This paper describes a method to design a predistorter (PD) for a power amplifier (PA) with a memory effect by using nonlinear parameters extracted from measured intermodulation distortion (IMD) for a GaN-FET amplifier. To improve the computational efficiency, the updating of a cancellation signal is provided by an iterative algorithm. It is confirmed that the proposed algorithm attains computational intensity lower than half of a memory polynomial. A computer simulation has clarified that the PD improves the adjacent channel leakage power ratio (ACLR) of OFDM signals with several hundred subcarriers corresponding to 4G mobile radio communications. It has been confirmed that a fifth-order PD is effective up to a higher power level. The improvement of error vector magnitude (EVM) by the PD is also simulated for OFDM signals of which the subcarrier channels are modulated by 16 QAM.

关键词： OFDM Power amplifiers Polynomials Nonlinear distortion Memory management RLC circuits Phase measurement

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Flow Inspection Router Assignment (FIRA) in Access/Aggregation network Clouds

Flow Inspection Router Assignment (FIRA) in Access/Aggregati...

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International Conference on Distributed Computing systems Workshop

作者： Jianping Wang Chunming Qiao Raghuram S. Sudhaakar Sateesh Addepalli Yaohui Jin Pablo Jesus Argibay-Losada Department of Computer Science City University of Hong Kong Hong Kong SAR Department of Computer Science and Engineering The State University of New York at Buffalo USA Cisco Systems State Key Lab. of Adv. Opt. Commun. Syst. & Network Shanghai Jiao Tong University Shanghai China Telematic Engineering Department University of Vigo SPAIN

Sufficient computing resources available at future generation routers in the access/aggregation networks can be pooled to form a cloud at edge, which we call Access/Aggregation network Cloud (or ANC). An ANC can be used to handle some of the information processing conventionally done inside the enterprise networks. ANC computing can also result in a much less delay and more flexibility than if such information processing is done centrally in a data center in the core. In this paper, we formulate two representative optimization problems related to Flow Inspection Router Assignment (FIRA) in ANCs. Their objectives are to minimize the (weighted) number of flows that still need to be inspected inside the enterprise network when only some flows can be assigned to the ANC due to the additional flow inspection delay in the ANC, and when all the flows can be assigned to the ANC, to minimize the additional flow inspection delay, respectively. We prove the NP-hardness of these two new problems, study their performance bounds and propose efficient heuristics. We further extend the formulation and solution to support multicast flows. Simulation shows that our heuristic algorithms can perform close to their performance bounds, implying their near optimality and the tightness of the bounds. In addition, simulation also demonstrates how inspection computing resources can be reduced for multicast flows.

关键词： Delay Inspection Upper bound Heuristic algorithms Logic gates Educational institutions Optimization

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Characterization of Raman gain for different gain medium

Characterization of Raman gain for different gain medium

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International Conference on Photonics (ICP)

作者： G. Mamdoohi B. A. Ahmad A. W. Al-Alimi M. A. Mahdi A. F. Abas M. Mokhtar B. Kheradmand Photonics Laboratory Department of Computer & Communications Systems Engineering Faculty of Engineering Universiti Putra Malaysia Serdang Selangor Malaysia Wireless and Photonics Network Research Centre Engineering and Technology Complex Universiti Putra Malaysia 43400 Serdang Selangor Malaysia Universiti Putra Malaysia Serdang Selangor MY

By using different fiber types as gain medium such as 500 m HNLF, 215 cm Bi-EDF, 7.2 km DCF, 11 km DCF, 18.2 km DCF, as well as the composition of Bi-EDF with 11 km DCF and finally the composition of Bi-EDF with the 18.2 km DCF, Raman gain was characterized and measured by the same set up as proposed in our study. The results revealed that the composition of Bi-EDF with the 18.2 km DCF provided the highest effective Raman gain among the other fibers investigated.

关键词： Optical fiber amplifiers Stimulated emission Gain Optical fiber dispersion Optical fiber communication Optical fiber polarization

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Application reliability for communication networks and its analysis method

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Journal of systems engineering and Electronics 2011年第6期22卷 1030-1036页

作者： Ning Huang Yang Chen Dong Hou Liudong Xing Rui Kang School of Reliability and Systems Engineering Beihang University Beijing 100191 E R. China School of Computer Science and Engineering Beihang University Beijing 100191 P. R. China Beijing Network Technology Key Laboratory Beihang University Beijing 100191 R R. China Department of Electrical and Computer Engineering University of Massachusetts Dartmouth MA 02747 USA

The network reliability is difficult to be evaluated because of the complex relationship among the network *** can be quite different for different users running different applications on the same *** paper proposes a new concept and a model of application *** from the existing models that ignores the effects of applications,the proposed application reliability model considers the effects of different applications on the network performance and different types of network faults and makes the analysis of network components relationship *** paper also provides a method to evaluate the application reliability when the data flow satisfies Markov ***,a case study is presented to illustrate the proposed network reliability model and the analysis method.

关键词： application reliability performance reliability service reliability network Markov model.

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Tunable Dual-Band Metamaterial Using Open Stub-Loaded Stepped-Impedance Resonator

Tunable Dual-Band Metamaterial Using Open Stub-Loaded Steppe...

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Asia-Pacific Conference on Communications

作者： A. R. H. Alhawari A. Ismail M. A. Mahdi R. S. A. R. Abdullah Centre of Excellence for Wireless and Photonics Network Department of Computer and Communication Systems Engineering Faculty of Engineering Universiti Putra Malaysia

ISBN: (纸本)9781457703898

In this paper, we report a tunable planar metamaterial that is designed to achieve dual-band negative refractive index response in microwave regime. Its distinctive characteristic is the usage of tuning open stub-loaded stepped-impedance resonators. The frequency tunability of the second band is achievable via the adjustable open stub-loaded at the fixed tune of the first band. Parameter retrieval algorithm and full-wave simulation of prism-shaped structure were carried out to validate the negative refraction characteristics of metamaterial structure. The results predict its prospect as a very promising alternative to the conventional ones, which is compatibly applicable on various potential microwave devices especially when a dual-band function is required. In addition to that, its design flexibility offers various frequency bands at any possible choice, which alterable with the design parameters.

关键词： Metamaterial Dual-band negative refractive index Open stub-loaded Stepped-impedance resonator

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