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Euromicro Conference on Real-Time Systems

作者： Shengquan Wang Jian-Jia Chen Jun Liu Xue Liu Department of Computer and Information Science University of Michigan Dearborn USA Department of Informatics Karlsruhe Institute of Technology Germany Department of Computer Science and Engineering University of Nebraska Lincolnshire USA

ISBN: (纸本)9781424475469

Reducing the power consumption while maintaining the response time constraint has been an important goal in server system design. One of the techniques widely explored in the literature to achieve this goal is Dynamic Voltage Scaling (DVS). However, DVS is not efficient in modern systems where the overall power consumption includes a large portion of static power consumption. In this paper, we aim to reduce the static power consumption by Dynamic Power Management (DPM) with sleep model in addition to DVS. We propose a smart PowerSleep power-saving scheme, where a procrastination technique is adopted to carefully aggregate jobs to reduce the overhead of transitions in and out of the sleep mode. We also observe that PowerSleep might not always be a good choice due to the mode transition overhead when the server utilization is high, where instead we use PowerIdle power-saving scheme with DVS only. By modeling the system with M/G/1/PS queuing model and further extensions, we present how to minimize the mean power consumption of the server under the given mean response time constraint for both power-saving schemes. Simulation results show that our smart PowerSleep scheme significantly outperforms the simple power saving scheme which adopts sleep mode.

关键词： Servers Power demand Time factors Voltage control Queueing analysis Scheduling algorithm Timing

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Probabilistic combination of spatial context with visual and co-occurrence information for semantic image analysis

Probabilistic combination of spatial context with visual and...

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IEEE International Conference on Image Processing

作者： Georgios Th. Papadopoulos Vasileios Mezaris Ioannis Kompatsiaris Michael G. Strintzis Centre of Research and Technology Informatics and Telematics Institute Greece Electrical & Computer Engineering Department Aristotle University of Thessaloniki Greece

In this paper, a probabilistic approach to combining spatial context with visual and co-occurrence information for semantic image analysis is presented. Overall, the examined image is segmented and subsequently an initial classification of the resulting image regions to semantic concepts is performed based solely on visual information. Then, a Genetic Algorithm (GA) is introduced for deciding on the optimal semantic image interpretation, realizing image analysis as a global optimization problem. The fundamental novelty of this work is that the GA incorporates in its evolutionary procedure a set of Bayesian Networks (BNs), which probabilistically learn the impact of the available spatial, visual and co-occurrence information on the final outcome for every possible pair of semantic concepts. Experimental results on two publicly available datasets demonstrate the efficiency of the proposed approach.

关键词： Visualization Context Semantics Probabilistic logic Image analysis Gallium Random variables

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Vision-based human motion analysis in epilepsy - Methods and challenges

Vision-based human motion analysis in epilepsy - Methods and...

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10th International Conference on Information technology and Applications in Biomedicine: Emerging Technologies for Patient Specific Healthcare, ITAB 2010

作者： Pediaditis, M. Tsiknakis, M. Vorgia, P. Kafetzopoulos, D. Danilatou, V. Fotiadis, D. Graz University of Technology Institute of Health Care Engineering Austria FORTH Biomedical Informatics Laboratory Institute of Computer Science Vassilika Vouton 71110 Heraklion Crete Greece Department of Applied Informatics and Multimedia Technological Educational Institute of Crete Greece University of Crete Mother and Child Division Medical School Greece FORTH Institute of Molecular Biology and Biotechnology Vassilika Vouton 71110 Heraklion Crete Greece University of Ioannina Department of Materials Science and Engineering Greece

ISBN: (纸本)9781424465606

Motion is one of the most important characteristics in clinical epileptology. In developing an integrated motion analysis system for epileptic patients or children with neurological disorders (e.g. ADHD) we surveyed and analyzed current efforts in vision-based human motion analysis in epilepsy as well as all possible forms of motion typically encountered in known epileptic syndromes. This paper presents the results in a systematic way, and includes a critical discussion of methodological and scientific challenges that need to be addressed in this particular domain. © 2010 IEEE.

关键词： Motion analysis

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Design and Implementation of Real-Time Transactional Memory

Design and Implementation of Real-Time Transactional Memory

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International Conference on Field Programmable Logic and Applications

作者： Martin Schoeberl Peter Hilber Department of Informatics and Mathematical Modeling Technical University of Denmark Denmark Institute of Computer Engineering University of Technology Vienna Austria

Transactional memory is a promising, optimistic synchronization mechanism for chip-multiprocessor systems. The simplicity of atomic sections, instead of using explicit locks, is also appealing for real-time systems. In this paper an implementation of real-time transactional memory (RTTM) in the context of a real-time Java chip-multiprocessor (CMP) is presented. To provide a predictable and analyzable solution of transactional memory, the transaction buffer is organized fully associative. Evaluation in an FPGA shows that an associativity of up to 64-way is possible without degrading the overall system performance. The paper presents synthesis results for different RTTM configurations and different number of processor cores in the CMP system. A CMP system with up to 8 processor cores with RTTM support is feasible in an Altera Cyclone-II FPGA.

关键词： Java Real time systems Hardware Field programmable gate arrays Context Instruction sets Clocks

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A personalized audio server using MPEG-7 and MPEG-21 standards

A personalized audio server using MPEG-7 and MPEG-21 standar...

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International Workshop on Semantic Media Adaptation and Personalization (SMAP)

作者： Emmanouil Skondras Angelos Michalas Malamati Louta Ioannis Anagnostopoulos Department of Informatics & Computer Technology Technological Educational Institute of Western Macedonia Kastoria Greece Department of Informatics and Telecommunications Engineering University of Western Macedonia Koza-gun Greece Department of Computer Science & Biomedical Informatics University of Central Greece Lamia Greece

This paper presents a semantic model which delivers personalized audio information. The personalization process is automated and decentralized. The metadata which support personalization are separated in two categories: the metadata describing user preferences stored at each user and the resource adaptation metadata stored at the server. The multimedia models MPEG-21 and MPEG-7 are used to describe metadata information. The Web Ontology Language (OWL) language is used to produce and manipulate the relative ontological descriptions.

关键词： Transform coding Servers OWL Multimedia communication Ontologies Semantics Standards

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A Novel Injection Aware Approach for the Testing of Database Applications

A Novel Injection Aware Approach for the Testing of Database...

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International Conference on Recent Trends in Information, Telecommunication and Computing (ITC)

作者： Ankit Anchlia Sheela Jain Department of Computer Science and Engineering Shri Vaishnav Institute of Technology and Science Indore India International Institute of Informatics and Management Jaipur India

Databases have become an integral part of the web applications in the current world. Database based applications have brought a revolution in the domain of information technology. These applications interact with the databases using Structured Query Language (SQL) queries embedded in the code. There are automated ways to test the applications written in imperative and structured languages. However, the methodologies to test the applications with embedded SQL queries are still in the nascent phase. The SQL injection attacks have become one of the most serious security threats. Testing of these applications poses grave challenges to the engineers. In this paper, a novel approach has been proposed to test the applications in a comprehensive way. The approach is a holistic one; it tests the system under real conditions without any artifacts, to avoid potential injection attacks.

关键词： Automatic testing Application software Libraries Information technology Telecommunication computing computer science Data engineering Database languages Security System testing

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An experimental analysis of biased parallel greedy approximation for combinatorial auctions

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International Journal of Intelligent Information and Database Systems 2010年第5期4卷 487-508页

作者： Fukuta, Naoki Ito, Takayuki Department of Computer Science Faculty of Informatics Shizuoka University 3 5 1 Johoku Nakaku Hamamatsu 4328011 Japan Department of Computer Science and Engineering Graduate School of Engineering Nagoya Institute of Technology Gokisocho Showa Nagoya 4668555 Japan

Considering emerging demands for auction based efficient resource allocations, the ability to complete an auction within a fine-grained time period without loss of allocation efficiency is in strong demand. Recently, an algorithm has been proposed to obtain near-optimal solutions for winner determination problem on combinatorial auctions within a very short computation time. However, it is demanded to analyse and clarify the main factor of such an excellent performance of the algorithm. Also, for practical use, there are demands to clarify the actual implementation-level performance of the algorithm compared to major commercial-level generic problem solvers. In this paper, we show an analysis about performance issues of biased parallel greedy updating approach in various experimental settings. Furthermore, we show that the algorithm has a certain advantage to solve a kind of large-size high-complexity problems when it is compared to a latest commercial-level implementation of generic LP solver through various experiments. © 2010 Inderscience Enterprises Ltd.

关键词： Approximation algorithms

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Discrete-time modeling tools for DC-DC converters

Discrete-time modeling tools for DC-DC converters

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2010 International Power Electronics Conference - ECCE Asia -, IPEC 2010

作者： Hamar, J. Nagy, I. Funato, H. Nishida, Y. Ohsaki, H. Masada, E. Department of Automation and Applied Informatics Budapest University of Technology and Economics Goldmann Gyorgy Ter 3 1111 Budapest Hungary MFKK Invention and Research Center Services Co. Ltd. Budapest Hungary Computer and Automation Research Institute Hungarian Academy of Science Budapest Hungary Dept. of Electrical and Electronic Engineering Utsunomiya University Utsunomiya Japan Dept. of Electric Electronics and Computer Engineering Chiba Institute of Technology Japan University of Tokyo Tokyo Japan Railway Technology Research Institute Tokyo Japan

ISBN: (纸本)9781424453955

The objective of the discrete-time modeling tools is twofold. First, they give an insight into the basic ideas of discrete-time modeling of dc-dc converters for university students and interested power electronics specialists. Second, as it is being presented below, the interactive calculation tools facilitate the fast and simple model-development in WEB browser after entering the basic circuit and load parameters. This feature can especially be useful for the practicing design engineers, since without long calculations with matrix functions the linearized discrete-time system model is immediately and automatically developed in both mathematical form (state-space equations and transfer functions in the Z domain) and also in graphical form (pole-zero map and bode plot). © 2010 IEEE.

关键词： DC-DC converters

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Agent placement in wireless embedded systems: Memory space and energy optimizations

Agent placement in wireless embedded systems: Memory space a...

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IEEE International Symposium on Parallel and Distributed Processing Workshops and Phd Forum (IPDPSW)

作者： Nikos Tziritas Thanasis Loukopoulos Spyros Lalis Petros Lampsas Computer & Communication Engineering Department University of Thessally Volos Greece Centre for Research and Technology슠Thessaly Volos Greece Department of Informatics & Computer Technology Technological Educational Institute of Lamia Lamia Greece

ISBN: (纸本)9781424465330

Embedded applications can be structured in terms of mobile agents that are flexibly installed on available nodes. In wireless systems, such nodes typically have limited battery and memory resources; therefore it is important to place agents judiciously. In this paper we tackle the problem of placing a newcomer agent in such a system. The problem has two main components. First, enough memory space must be found or created at some node to place the agent. Second, the placement should be energy efficient. We present heuristics for tackling these two goals in a stepwise fashion, as well as a branch and bound method for achieving both goals at the same time. Our algorithms are centralized assuming a single entry point through which agents are injected into the system, with adequate knowledge of the system state and enough resources to run the proposed algorithms. The algorithms are evaluated under different simulated scenarios, and the tradeoffs across the two metrics (space, energy) are identified.

关键词： Embedded system Application software Space technology Batteries Educational technology Embedded computing Home automation Wireless networks Dynamic programming Mobile communication

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An iterative approach to the robust H∞ synthesis problem with a sequence of infeasible controllers

An iterative approach to the robust H∞ synthesis problem wi...

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IEEE International Symposium on computer Aided Control System Design (CACSD)

作者： Yasushi Kami Eitaku Nobuyama Department of Electrical and Computer Engineering Akashi National College of Technology Hyogo Japan Department of Systems Design and Informatics Kyushu Institute of Technology Fukuoka Japan

This paper aims to design a robust H ∞ control system against time invariant polytopic uncertainties. In general, such robust control problems are described by parameter dependent bilinear matrix inequality (PDBMI) problems which are not tractable numerically and there are few efficient methods for solving them. In this paper, we propose an iterative approach to the robust H ∞ controller synthesis problems, which constructs a sequence of infeasible controllers. The feature of our approach is to be able to use any controller variables which may not be a robust stabilizing controller as an initial point. The efficiency of our approach is shown by a numerical example.

关键词： Robustness Iterative methods Lyapunov method Linear matrix inequalities Symmetric matrices Eigenvalues and eigenfunctions Control systems

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