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Direction-of-arrival estimation of wideband chirp signals using the Wigner distribution of symmetrical sensor array 1

Direction-of-arrival estimation of wideband chirp signals us...

引用

1st international conference on Communications, Circuits and systems, ICCCAS 2002

作者： Huang, Ke-Ji Tian, Da Chen, Tian-Qi College of EE University of Electronic Science and Technology of China Chengdu610054 China

ISBN: (纸本)0780375475

Recently, time-frequency techniques have been successfully applied in narrowband direction-of-arrival (DOA) estimation (see Amin, M.G., 1999;Belouchrani, A. and Amin, M.G., 1999;Zhang, Y. et al., 2001;2000). A novel time-frequency approach to direction finding of wideband chirp signals is proposed. Our technique employs the Wigner-Ville distribution (WVD) of a symmetrical sensor array to get direction vectors of wideband chirp signals. By time-frequency selectivity, a new data model is constructed to estimate the DOA of each signal one by one. A subspace method is exploited to deduce the DOA from the new model. The computation cost of our method is low because no focussing or interpolation is needed. Simulation results illustrate the performance of our method. © 2002 ieee.

关键词： Direction of arrival

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Electricity supply project in Roppongi area and new technology incorporated in urban power plant

Electricity supply project in Roppongi area and new technolo...

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1st international conference and Exhibition on Transmission and Distribution in the Asia Pacific Region

作者： Shinji, T Tokyo Gas Co Ltd Tokyo Japan

ISBN: (纸本)0780375254

The amendment to the Electricity Utilities Industry Law in December 1995 in Japan created a new category of electric power supplier called "specific electric utility industry". These utilities are entities other than general electric utility industry that are allowed to supply electricity to a number of users in one or more buildings, such as office blocks, using CHP(Combined Heat & Power) and other kinds of power sources. In Japan today, CHPs have only been used to supply electricity to customers within the building where the generator is. Specific electric utility industry, however, is allowed to supply and sell electricity to the buildings outside the building where the generator is, which can not be seen anywhere else in the world. Combining CHPs with conventional district heating and cooling systems (DHC) as an element of urban redevelopment projects makes it possible to create energy efficient, environmentally benign and economical energy supply systems. systems of this kind represent the ultimate in distributed energy supply systems, and are likely to grow increasingly widespread in the future. A specific electricity supply service is being planned by Tokyo Gas for the redevelopment project in Roppongi area, in the heart of Tokyo. The power generation system, which will have a total output of 36,500kW, will be powered by steam-injection gas turbines. Although two specific electric utility industry have already been launched elsewhere in Japan, the project will be the largest of its kind in this country and the first to offer full-fledged services in an urban area. The attached heat service plant will have a capacity of 66,810kW (19,000USRT), and utilize all waste heat generated in the process of power generation. Together, the power system and heat service system will consume 18% less energy and emit 25% less CO2 and 44% less NOx than a conventional energy supply system. This unprecedented project to build Japan's first ever large-scale urban power plant pres

关键词： Combined heat & power distributed energy supply system District hating & cooling Electric liberalization Gas turbine Specific electricity supply steam-injection gas turbine

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Software processes for electronic commerce portal systems 1

引用

1st international conference on Engineering and Deployment of Cooperative Information systems

作者： Gruhn, V Schöpe, L Univ Dortmund Fachbereich Informat Lehrstuhl Software Technol D-44227 Dortmund Germany Informat Centrum Dortmund eV Abt Software Techn D-44227 Dortmund Germany

ISBN: (纸本)3540442227

The development of electronic commerce (EC) systems is subject to different conditions than that of conventional software systems. Examples of such differentiating conditions are that the development requires the integration of many systems from various suppliers and that content and functionality have to be coordinated closely. In addition, the roles involved in the development process, their tasks, qualifications and the software tools used by them, are different to other processes. An adapted process must cope with important idiosyncrasies of EC system development: EC systems typically have a high degree of interaction, which makes factors like ergonomics, didactics and psychology especially important in the development of user interfaces. Furthermore, the approach to the development of EC systems should take into account the "time-to-market" factor and allow development time reduction while retaining quality. This paper introduces and describes an adapted software development process for EC systems and its special features using the development of an EC portal system as an example.

关键词： electronic commerce software process component based development distributed architecture design

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Service and network management middleware for cooperative information systems through policies and mobile agents 1

引用

1st international conference on Engineering and Deployment of Cooperative Information systems

作者： Yang, K Galis, A Mota, T Guo, X Todd, C UCL Dept Elect & Elect Engn London WC1E 7JE England

ISBN: (纸本)3540442227

As cooperative information systems (CIS) grow to cover large-scaled CIS that involves many cooperative sub-systems distributed geographically, management technologies that support them gain in importance. This paper focuses on the underlying technologies that are key to the success of cooperative information system, i.e., service management and network management, which are in the form of middleware, to assure inter-domain cooperation within a big CIS in a flexible, automated and secure way. This flexibility and automation is guaranteed by the use of Policy-based Network Management integrated with Mobile Agent Technology. Extending the mobile agent supporting environment, Grasshopper, to support more secure facilities, largely enhances the security. As a case study, IP Virtual Private Network tunnel between two geographically separated domains within a large-scaled CIS is set up and configured automatically and securely using the service and network management middleware, which shows that service and network management enhanced CIS can operate with more flexibility, automation, security and in a larger information system.

关键词： Network management

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Design of a broadband microwave amplifier constructed with mixed lumped and distributed elements for mobile communication

Design of a broadband microwave amplifier constructed with m...

引用

ieee international conference on Circuits and systems for Communications (ICCSC)

作者： B. Siddik Yarman E.G. Cimen Büyükdere Cad Işk University Istanbul Turkey

In this paper, we designed a broadband microwave amplifier utilizing a "semi-analytic method to describe symmetrical lossless two-ports with two kinds of elements", namely, distributed and lumped elements in cascade connection. It is expected that the results presented in this paper will find immediate application to design analog/digital mobile communication systems on MMIC or VLSI chips.

关键词： Microwave amplifiers Broadband amplifiers distributed amplifiers Symmetric matrices Transmission line matrix methods Scattering parameters Polynomials Mobile communication MMICs Very large scale integration

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New structures of precision sensors of resistive type

New structures of precision sensors of resistive type

引用

ieee international conference on Circuits and systems for Communications (ICCSC)

作者： I.P. Scherbinin Control Systems Department Taganrog State University of Radio Engineering Russia

In this article a new method of synthesis of resistive precision sensor structure is shown. There are theoretical theses that give a chance to create precision device networks using the elements that do not have high quality characteristics. These theses are proved in this work. There is an example of resistive sensor structure synthesis and results of its design. The structure is characterized by a high sensitivity of transformation, low level of noise and zero drift. Such results are possible because the signal and noise gains are independent. Moreover, there is a great (more then an order of magnitude) widening of frequency range.

关键词： Network synthesis Signal synthesis Noise level Transfer functions Control systems Control system synthesis sensor phenomena and characterization Radio control Frequency Modems

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Fundamental limitations in precision analog circuits

Fundamental limitations in precision analog circuits

引用

ieee international conference on Circuits and systems for Communications (ICCSC)

作者： S.G. Krutchisky Control Systems Department Taganrog State University of Radio Engineering Russia

The following principle of self compensation is formulated on the basis of an analysis of a general structure. The main technological inaccuracy of active elements' production influence the network characteristics. A sufficient condition of self compensation was found for ARC networks and its uniqueness was proved. In this case additional compensating circuit loops of feedback, put in networks, do not influence the set of device transfer functions and do not change the upper level of its dynamic range. For an amplifier, the second topological method is shown. It influences the realized transfer functions. With the help of the results we can formulate a new method of high-accuracy analog device building in an alternative submicron (less then micron) technology.

关键词： Analog circuits Transfer functions Production Dynamic range Radio control Control systems Feedback circuits Feedback loop sensor phenomena and characterization Circuit synthesis

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1st international Workshop on Advanced Internet Services and Applications 2002

引用

1st international Workshop on Advanced Internet Services and Applications, AISA 2002

ISBN: (纸本)3540439684

The proceedings contain 28 papers. The special focus in this conference is on Internet among academia, industry, and regulating government bodies cannot be overemphasized. The topics include: A new survival architecture for network processors;mean time to unsafe failure;performance of antenna arrays with reverse-link synchronous transmission technique for DS-CDMA system in multipath fading channels;a noble routing algorithm for the internet computational GRID;a genetic routing algorithm for a 2D-meshed fault-tolerant network system;allowable propagation delay for VoIP calls of acceptable quality;robustness of a neighbor selection markov chain in prefetching tiled web data;QoS signaling for parameterized traffic in ieee 802.11e wireless LANs;content-adaptive request distribution strategy for internet server cluster;a new DSP architecture for correcting errors using viterbi algorithm;an adapting weight rerouting algorithm for handoff control in wireless ATM networks;optimal buffering strategy for streaming service in time varying wireless environment;optimum ship routing and it's implementation on the web;development of a residential gateway and a service server for home automation;performance of multiple TCM codes with transmit antenna diversity;on the study of MAC layer for cdma2000 wireless packet data service;increasing the testability of object-oriented frameworks with built-in tests;guaranteeing the continuous stream service in cluster media servers;a SOAP-based framework for the internetworked distributed control systems;an efficient on-line monitoring BIst for remote service system and TCP performance enhancement using FG-LIW (fairness guaranteed - larger initial window) scheme in the wired-cum-wireless network environment.

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Group velocity and dispersion coefficient in the distributed sensor of vibration in fibre optic Michelson's interferometer configuration

Group velocity and dispersion coefficient in the distributed...

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1st international Workshop on Intelligent Data Acquisition and Advanced computing systems

作者： Kizlik, B Nichoga, V Dub, P Mil Univ Technol Dept Elect Inst Fundamental Elect PL-00908 Warsaw Poland

ISBN: (纸本)078037164X

The problem of determination of group velocity and dispersion coefficient in the distributed sensor of vibration in fibre optic Michelson's interferometer configuration is considered in the report. Influence of acoustic wave on optical wave in a Bragg modulator is described. It is shown that such interferometer can be used as a distributed highly, sensitive sensor of mechanical values (vibration, acoustic wave, pressure, displacement).

关键词： Michelson's interferometer fibre optic distributed vibration sensor

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distributed Object computing and its application in electronic commerce systems

Distributed Object Computing and its application in electron...

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1st ACS/ieee international conference on Computer systems and Applications

作者： Saleh, K Demarais, C Koppler, R Amer Univ Sharjah Dept Comp Sci & Math Sharjah U Arab Emirates

ISBN: (纸本)0769511651

distributed Object computing (DOC) is an increasingly important computing paradigm exploiting the benefits of object-oriented technology and using the internet and its communications infrastructure as a vehicle for the delivery of a wide range of sophisticated value-added distributed services. ne integration of the Common Object Request Broker Architecture (CORBA) and object-oriented programming languages facilitates the introduction and deployment of such applications in a platform-independent open distributed environment. In this paper, we introduce both CORBA and Java as tools to facilitate the development of distributed object computing-based applications, and we present a prototype electronic commerce application using the DOC paradigm.

关键词： CORBA distributed Object computing electronic commerce Java object-orientation

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