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Workshop on Positioning, Navigation and communication, WPNC

作者： Stefan Bruning Johannes Zapotoczky Peter Ibach Vladimir Stantchev Members of the group for computer architecture and communication (ROK) Humboldt University of Berlin Germany Member of the group for System Analysis and IT Berlin University of Technology Germany

We present MagicMap, a cooperative, hybrid positioning system developed at the Humboldt-University in Berlin. While most other positioning systems are limited to specific scenarios and technologies our system provides means to incorporate any available wireless networking technology. Currently, MagicMap supports WLAN, RFID, and ZigBee as wireless technologies for positioning and Linux, Windows, and Windows CE as platforms. Position calculation and exchange is based on a cooperative approach allowing an open internet community to share the required data.

关键词： Radiofrequency identification Wireless LAN ZigBee Internet Global Positioning System Mobile handsets Wireless sensor networks Laboratories Navigation Linux

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REQUIREMENTS FOR AN EVENT-BASED SIMULATION PACKAGE FOR GRID SYSTEMS

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Journal of Interconnection Networks 2007年第2期8卷 163-178页

作者： FATOS XHAFA JAVIER CARRETERO LEONARD BAROLLI ARJAN DURRESI Polytechnic University of Catalonia Department of Languages and Informatics Systems C/Jordi Girona 1-3 08034 Barcelona Spain . Polytechnic University of Catalonia Department of Computer Architecture C/Jordi Girona 1-3 08034 Barcelona Spain Department of Information and Communication Engineering Fukuoka Institute of Technology (FIT) 3-30-1 Wajiro-higashi Higashi-ku Fukuoka 811-0295 Japan Department of Computer Science Louisiana State University 298 Coates Hall Baton Rouge LA 70803 USA

In this paper we present a study on the requirements for the design and implementation of simulation packages for Grid systems. Grids are emerging as new distributed computing systems whose main objective is to manage and allocate geographically distributed computing resources to applications and users in an efficient and transparent manner. Grid systems are at present very difficult and complex to use for experimental studies of large-scale distributed applications. Although the field of simulation of distributed computing systems is mature, recent developments in large-scale distributed systems are raising needs not present in the simulation of the traditional distributed systems. Motivated by this, we present in this work a set of basic requirements that any simulation package for Grid computing should offer. This set of functionalities is obtained after a careful review of most important existing Grid simulation packages and includes new requirements not considered in such simulation packages. Based on the identified set of requirements, a Grid simulator is developed and exemplified for the Grid scheduling problem.

关键词： Grid systems event-based simulation requirements scheduling

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Monte Carlo go has a way to go

Monte Carlo go has a way to go

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21st National Conference on Artificial Intelligence and the 18th Innovative Applications of Artificial Intelligence Conference, AAAI-06/IAAI-06

作者： Yoshimoto, Haruhiro Yoshizoe, Kazuki Kaneko, Tomoyuki Kishimoto, Akihiro Taura, Kenjiro Department of Information and Communication Engineering University of Tokyo Japan Graduate School of Information Science and Technology University of Tokyo Japan Department of Graphics and Computer Sciences University of Tokyo Japan Department of Media Architecture Future University Hakodate Japan

ISBN: (纸本)1577352815

Monte Carlo Go is a promising method to improve the performance of computer Go programs. This approach determines the next move to play based on many Monte Carlo samples. This paper examines the relative advantages of additional samples and enhancements for Monte Carlo Go. By parallelizing Monte Carlo Go, we could increase sample sizes by two orders of magnitude. Experimental results obtained in 9 × 9 Go show strong evidence that there are trade-offs among these advantages and performance, indicating a way for Monte Carlo Go to go. Copyright © 2006, American Association for Artificial Intelligence (***). All rights reserved.

关键词： Monte Carlo methods

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A Best Practice Guide to Resources Forecasting for the Apache Webserver

A Best Practice Guide to Resources Forecasting for the Apach...

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Pacific Rim International Symposium on Dependable Computing

作者： Gunther A. Hoffmann Kishor S. Trivedi Miroslaw Malek Humboldt University Berlin Germany Computer Architecture and Communication Group Department of Electrical & Computer Engineering Duke University Durham NC USA

Recently, measurement based studies of software systems proliferated, reflecting an increasingly empirical focus on system availability, reliability, aging and fault tolerance. However, it is a non-trivial, error-prone, arduous, and time-consuming task even for experienced system administrators and statistical analysis to know what a reasonable set of steps should include to model and successfully predict performance variables or system failures of a complex software system. Reported results are fragmented and focus on applying statistical regression techniques to captured numerical system data. In this paper, we propose a best practice guide for building empirical models based on our experience with forecasting Apache Web server performance variables and forecasting call availability of a real world telecommunication system. To substantiate the presented guide and to demonstrate our approach step-by-step we model and predict the response time and the amount of free physical memory of an Apache Web server system. Additionally, we present concrete results for a) variable selection where we cross benchmark three procedures, b) empirical model building where we cross benchmark four techniques and c) sensitivity analysis. This best practice guide intends to assist in configuring modeling approaches systematically for best estimation and prediction results

关键词： Best practices Predictive models Software systems Availability Web server Software measurement Aging Fault tolerant systems Statistical analysis Delay

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Practice and experience of an embedded processor core modeling

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2nd International Conference on High Performance Computing and communications, HPCC 2006

作者： Park, Gi-Ho Sung, Woo Chung Kim, Han-Jong Im, Jung-Bin Park, Jung-Wook Kim, Shin-Dug Park, Sung-Bae Processor Architecture Lab. SOC R and D Center System LSI Division Kyeonggi-Do Korea Republic of Division of Computer and Communication Engineering Korea University Anam-Dong Seongbuk-Gu Seoul Korea Republic of Supercomputing Lab. Yonsei University 134 Shinchon-Dong Seodaemun-Gu Seoul Korea Republic of

ISBN: (纸本)3540393684

This paper presents our experience in developing an embedded processor core model for an SOC design. We developed an ARM1136 processor simulation environment based on the ARM's MaxCore tool and the SimpleScaclar simulator. A MaxCore ARM1136 instruction accurate (IA) model is developed to support application programmers for the writing application programs from the early design stage. The MaxCore ARM1136 processor model supports all ARMv4, ARMv5TE and ARM v6 instruction sets with 418 LISA instructions. This MaxCore IA Model can be integrated with the ARM's MaxSim system level design environment to develop application softwares and perform architecture explorations. A SimpleScalar ARM1136 cycle accurate (CA) model is also developed by enhancing the existing SimpleScalar-ARM version in the SimpleScalar 3.0. Most important micro-architectural features of ARM1136 processor are implemented in the enhanced SimpleScalar simulator. The accuracy of the developed SimpleScalar-ARM 1136 simulator is about 97% compared to ARM 1136 RTL simulation with the Dhrystone benchmark (100 iterations). © Springer-Verlag Berlin Heidelberg 2006.

关键词： Embedded systems

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Two-dimensional evaluation of the queueing network equilibrium based on clustering and self-organizing map

Two-dimensional evaluation of the queueing network equilibri...

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Joint IST Symposium on Mobile Future, and the Symposium on Trends in communications, SympoTIC

作者： D. Radev I. Lokshina S. Radeva Department of Communication Technique and Technology University of Rousse Rousse Bulgaria Division of Economics and Business SUNY Oneonta Oneonta USA Department of Computer Aided Engineering Civil Engineering and Geodesy University of Architecture Sofia Bulgaria

A new approach to two-dimensional evaluation of the queueing network equilibrium, based on calculations of the steady-state probability vector with use of neural modeling and clustering, is considered in this paper. The equilibrium of queueing networks is a mean for performance evaluation of real communication systems presented as Markov chains. The experimental results were obtained with use of clustering analysis and self-organizing map, and the proposed method was compared with direct techniques on the base of obtained results

关键词： Steady-state Equations Markov processes Performance analysis Iterative methods communications technology Power generation economics Business communication computer aided engineering computer architecture

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Site dependent estimation of the seismic strong motion - Case study for Sofia region

Site dependent estimation of the seismic strong motion - Cas...

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作者： Radeva, Svetla Paskaleva, I. Radev, D. Panza, G. Department of Computer Aided Engineering University of Architecture Civil Engineering and Geodesy 1 Hristo Smirnensky Blvd. 1046 Sofia Bulgaria Central Laboratory of Seismic Mechanics and Earthquake Engineering Bulgarian Academy of Sciences Acad. G. Bonchev str. 1113 Sofia Bulgaria Department of Communication Technique and Technologies University of Rousse 8 Studentska Str. 7017 Rousse Bulgaria DST-University of Trieste SAND Group Strada Costiera 11 34100 Trieste Italy

The problem of site dependent estimation of the seismic strong motion for Sofia region is discussed. Deterministic modelling for micro-zonation of Sofia region is implemented for receiving an estimation of local site conditions as result of displacements provoked by seismic events in Sofia region with stochastic and neural modelling. An approach for seismic waves classification on the base of principal axis transformation, long-range dependence time series analysis and neural modelling is suggested. With the help of scene oriented model are determined the boundaries of destructive phase of strong motion acceleration. For selected diapason of destructive phase is implemented two-dimensional vector quantization for transformed accelerograms with maximal and middle values. With self-organizing map are determined weight centres of selected classes of destructive phase. Learned and trained self-organizing map optimize selected target classes and determine probability density function. Suggested model helps to provide side dependent estimation of the seismic strong motion for Sofia region. © 2006 Akadémiai Kiadó, Budapest.

关键词： Seismic prospecting

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Conversation-linked navigation system - Provides conversation-related information during a telephone conversation

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NTT Technical Review 2006年第5期4卷 45-49页

作者： Mukaigaito, Takeya Takada, Shinya Yokozeki, Daigoro Sakai, Rie Sakai, Miki Murayama, Takahiko Arai, Katsuya NTT Information Sharing Platform Laboratories Musashino-shi 180-8585 Japan Network Application Platform Project NTT Information Sharing Platform Laboratories Software Architecture Project NTT Information Sharing Platform Laboratories NTT Information Sharing Platform Laboratories Graduate School of Information Systems University of Electro-Communications Japan Institute of Electronics Information and Communication Engineers of Japan Japan Society of Artificial Intelligence IEEE Computer Society Association for Computing Machinery IPSJ

This article introduces a conversation-linked navigation system that uses keywords occurring during a telephone conversation to guide users to relevant content on the Internet in a seamless manner in real time.

关键词： Navigation systems

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Highly available location-based services in mobile environments

Highly available location-based services in mobile environme...

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First International Service Availability Symposium, ISAS 2004

作者： Ibach, Peter Horbank, Matthias Humboldt University Computer Science Department Computer Architecture and Communication Group Rudower Chaussee 25 12489 Berlin Germany

We show how to use Web Services standards for propagation, discovery, and composition of location-based services in mobile environments. To achieve semantic interoperability we express location information in XML using context-specific ontologies. The achieved interoperability allows for context-aware on-demand service composition making the composite service highly available and resilient to environmental dynamics and uncertainties. © Springer-Verlag Berlin Heidelberg 2005.

关键词： World Wide Web

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Clustering analysis of stochastic node networks 4

Clustering analysis of stochastic node networks

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4th IFAC Workshop Automatic Systems for Building the Infrastructure in Developing Countries, DECOM-TT 2004

作者： Radev, Dimitar Radeva, Svetla Department of Communication Technique and Technologies University of Rousse Rousse7017 Bulgaria Department of Computer Aided Engineering University of ArchitectureCivil Engineering and Geodesy Sofia Bulgaria

In this paper is solving the problem of performance evaluation of discrete Markov chains in which the topology is unknown in advance. Two heuristic classification procedures for clustering of classes are presented. The first is realized with the help of self-organizing Kohonen neural network in which the target classes are describing with winner weights vectors. The efficiently performance of the clustering topological problem at the second procedure uses the combination of minimum variance with rare event cross entropy method. As an illustration, are shown numerical examples for two-dimensional stochastic node network, which describes the feasible states of Jackson tandem queue. Copyright © 2004 IFAC.

关键词： Stochastic systems

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