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15th IEEE International Conference on Embedded and Real-Time Computing systems and Applications, RTCSA 2009

作者： Tu, Tang-Hsun Hsueh, Chih-Wen Chang, Rong-Guey Embedded System and Wireless Network Laboratory Graduate Institute of Networking and Multimedia National Taiwan University Taipei 106 Taiwan System Software Laboratory Graduate Institute of Computer Science and Information Engineering National Chung Cheng University Chia-Yi 621 Taiwan

ISBN: (纸本)9780769537870

In multicore environment, using multiple threads is a common useful approach to improve application performance. Nevertheless, even in many simple applications, the performance might degrade when the number of threads increases. Users usually impute this phenomenon to the overhead of creation or termination of threads. However, in our observation, the more significant effect is the dispatching of threads. We discuss the problems on using threads, and present a novel User Dispatching Mechanism (UDispatch) that provides controllability in user space to improve application performance. Since user threads cannot directly control system resources, a virtual device is adopted between user space and operating system for portability and efficiency instead of adding new system calls through kernel modification. We also experiment UDispatch through multi-threading multimedia applications. The results show that a skip-line application speeds up to 111.3% and 111.6% on a 4-core machine and an 8-core machine, respectively, and an optimized H.264/AVC decoder speeds up to 18.4% on a 4-core machine. © 2009 IEEE.

关键词： computer architecture

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Texture Synthesis with Prioritized Pixel Re-synthesis

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Journal of Information science and engineering 2009年第2期25卷 389-402页

作者：嚴崇仁李同益 Computer Graphics Group/Visual System Laboratory Department of Computer Science and Information Engineering National Cheng Kung University

In this paper, we propose a new patch-based texture synthesis method. The core of the proposed method consists of two main components: (1) a feature-weighted similarity measurement to search for the best match and (2) a dynamically prioritized-based pixel re-synthesis to reduce discontinuity at the boundary of adjacent patches. Examples and experimental comparisons with other previous methods are demonstrated to verify the usefulness of our proposed method. In addition, we enhance the proposed method with a view warping technique to better synthesize non-frontal-parallel textures (NFPTs) that can not be synthesized well by traditional texture synthesis methods.

关键词： patch-based texture synthesis, prioritized-based pixel re-synthesis, feature- weighted, best match, discontinuity, frontal-parallel (FP) and non-frontal-parallel (NFP), view-warping

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Rendering method for multi-attribute objects based on state transition optimization strategy

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Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao/Journal of computer-Aided Design and computer Graphics 2009年第3期21卷 311-318页

作者： Chen, Zhiyu Liang, Xiaohui Yu, Zhuo State Key Laboratory of Virtual Reality Technology and System School of Computer Science and Engineering Beihang University Beijing 100083 China

Efficient rendering of complex scenes has receive great attention in real-time computer graphics. Current researches are mostly concentrated on reducing the geometric complexity of the scene model such as reconstructing an LOD representation, performing visibility culling etc. However, the rendering process of complex scenes involves not only the geometric information of each object, but also multiple attributes, including lighting, material, texture, etc. The invocation of each attribute corresponds to a specific state in the rendering pipeline, frequent transfer between different states in the pipeline will introduce large amount of overhead, hence reducing the rendering efficiency. A rendering method accounting for efficient invocation of multiple attributes of objects based on state transition optimization strategies is presented. It estimates the cost for invoking each attribute of objects in the rendering pipeline and expresses the transitions between various render states as a weighted directed graph. Then the optimized sequence of state transition is obtained by optimization. Experimental results show that our proposed method can effectively reduce the overhead of state transition and improve the rendering efficiency of scenes containing large amounts of multi-attribute objects.

关键词： Efficiency

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Making applications more intelligent: A case study of optimizing route selection for emergency vehicles

Making applications more intelligent: A case study of optimi...

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Annual IEEE Symposium on computer-Based Medical systems

作者： Sandi Pohorec Mateja Verlic Milan Zorman Laboratory of system design Faculty of electrical engineering and computer science University of Maribor Slovenia

We present the results of a data mining research on the use of GPS positions and speed of travel of vehicles in urban areas to determine optimal travel routes for emergency vehicles. A new approach using predictive programming is presented. The approach focuses on using data mining of existing data as the key factor in the application logic where various decisions are to be made. The main appeal of such an approach is that the application logic evolves over time according to the application data. As the data changes the decisions soon follow. This gives the impression of intelligent behavior of the application.

关键词： Intelligent vehicles Global Positioning system Data mining Mobile handsets Poles and towers Logic programming Satellite navigation systems Roads Velocity measurement Earth

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ARRAY: A non-application-related, secure,wide-area disaster recovery storage system

ARRAY: A non-application-related, secure,wide-area disaster ...

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2009 IEEE International Symposium on Parallel and Distributed Processing with Applications, ISPA 2009

作者： Zeng, Lingfang Feng, Dan Veeravalli, Bharadwaj Wei, Qingsong Division of Data Storage System Wuhan National Laboratory for Optoelectronics Key Laboratory of Information Storage Wuhan 430074 China School of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074 China Department of Electrical Computer Engineering National University of Singapore Singapore 117608 Singapore Data Storage Institute Singapore 117608 Singapore

ISBN: (纸本)9780769537474

With our society more information-driven, we have begun to distribute data in wide-area storage systems. At the same time, both physical failure and logic error have made it difficult to bring the necessary recovery to bear on remote data disaster, and understanding this proceeding. We describe ARRAY, a system architecture for data disaster recovery that combines reliability, storage space, and security to improve performance for data recovery applications. The paper presents an exhaustive analysis of the design space of ARRAY systems, focusing on the trade-offs between reliability, storage space, security, and performance that ARRAY must make. We present RSRAII (Replication-based Snapshot Redundant Array of Independent Imagefiles) which is a configurable RAIDlike data erasure-coding, and also others benefits come from consolidation both erasure-coding and replication strategies. A novel algorithm is proposed to improve snapshot performance referred to as SMPDP (Snapshot based on Multi-Parallel Degree Pipeline).

关键词： Recovery

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SR direct etching of PTFE and its application to millimeter-wave PTFE-filled waveguide

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and systems 2009年第2期129卷 259-266+9页

作者： Kishihara, Mitsuyoshi Ukita, Yoshiaki Yamamoto, Shigeaki Ohta, Isao Utsumi, Yuichi Faculty of Computer Science and System Engineering Okayama Prefectural University 111 Kuboki Soja-shi Okayama 719-1197 Japan Japan Laboratory of Advanced Science and Technology for Industry University of Hyogo 3-1-2 Kamigori Ako Hyogo 678-1205 Japan University of Hyogo 2167 Shosha Himeji-shi Hyogo 671-2280 Japan

Microdevices have recently been developed by various micromachining technologies such as laser cutting, lithography, etc. PTFE is widely used as a microwave and millimeter-wave material. However, it is known that PTFE is too difficult to process with high precision by conventional machining, or even by laser cutting or electrical discharge machining. It has been reported that PTFE microstructures can be fabricated by direct exposure to synchrotron radiation. In this paper, the SR direct etching of PTFE is introduced and a trial fabrication of millimeter-wave PTFE-filled waveguide by sputter deposition of metal is attempted. © 2009 The Institute of Electrical Engineers of Japan.

关键词： Millimeter waves

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Extracting real-life log with data perspective in PLM system for business process analysis

Extracting real-life log with data perspective in PLM system...

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2009 WRI World Congress on computer science and Information engineering, CSIE 2009

作者： Wang, Zhaoxia Wang, Jianmin Wen, Lijie Liu, Yingbo Department of Computer Science Tsinghua University Beijing China School of Software Tsinghua University Beijing China Key Laboratory for Information System Security Ministry of Education Logistical Engineering University Chongqing China Department of Logistical Information Engineering Logistical Engineering University Chongqing China

ISBN: (纸本)9780769535074

Event log is the important starting point of any process analysis technique. Existent business process analysis techniques are applied mainly to manual or simulated logs, considering mainly information about control perspective. In this paper, we first analyze the feature of data perspective of PLM (Product Lifecycle Management) system in manufacturing area, and extend the MXML format to support the log with data perspective information in PLM domain. Subsequently, we introduce an approach of data cleaning to separate the multi-version process information in real-life data set. In the end, we produce real-life log with information about data perspective in PLM system, then, mine the process model from real-life log and evaluate the proposed approach by fitness measuring. © 2008 IEEE.

关键词： Life cycle

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Local search engine with global content based on domain specific knowledge

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WSEAS Transactions on Information science and Applications 2009年第9期6卷 1544-1554页

作者： Pohorec, Sandi Verlič, Mateja Zorman, Milan Laboratory for System Design University of Maribor Faculty of Electrical Engineering and Computer Science Smetanova 17 2000 Maribor Slovenia

In the growing need for information we have come to rely on search engines. The use of large scale search engines, such as Google, is as common as surfing the World Wide Web. We are impressed with the capabilities of these search engines but still there is a need for improvment. A common problem with searching is the ambiguity of words. Their meaning often depends on the context in which they are used or varies across specific domains. To resolve this we propose a domain specific search engine that is globally oriented. We intend to provide content classification according to the target domain concepts, access to privileged information, personalization and custom ranking functions. Domain specific concepts have been formalized in the form of ontology. The paper describes our approach to a centralized search service for domain specific content. The approach uses automated indexing for various content sources that can be found in the form of a relational database, web service, web portal or page, various document formats and other structured or unstructured data. The gathered data is tagged with various approaches and classified against the domain classification. The indexed data is accessible through a highly optimized and personalized search service.

关键词： Search engines

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A 1.3pJ/b inductive coupling transceiver with adaptive gain control for Cm-range 50Mbps data communication

A 1.3pJ/b inductive coupling transceiver with adaptive gain ...

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IEEE Asian Conference on Solid-State Circuits (ASSCC)

作者： Seulki Lee Jerald Yoo Kiseok Song Hoi-Jun Yoo Semiconductor System Laboratory Department of Electrical Engineering and Computer Science KAIST Daejeon South Korea

A 1.3 pJ/b inductive coupling transceiver is proposed for Cm-range multimedia data transmission in mobile device applications. Its transmission time control (TTC) scheme and adaptive gain control (AGC) scheme reduce the energy consumption below to 1.3 pJ/b. Inductor with self-resonance frequency above 200 MHz achieves the data rate over 50 Mbps. The receiver sensitivity can be enhanced to increase the communication distance up to 7 cm by relative magnitude comparison between two nodes of the receiver inductor. The transceiver consumes only 65 ¿W in total with 1 V supply.

关键词： Transceivers Programmable control Adaptive control Gain control Data communication Couplings Inductors Communication system control Energy consumption Frequency

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A cumulant-based method for gait identification using accelerometer data with principal component analysis and support vector machine

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WSEAS Transactions on Signal Processing 2009年第11期5卷 369-378页

作者： Sprager, Sebastijan Zazula, Damjan System Software Laboratory University of Maribor Faculty of Electrical Engineering and Computer Science Smetanova ulica 17 2000 Maribor Slovenia

In this paper a cumulant-based method for identification of gait using accelerometer data is presented. Acceleration data of three different walking speeds (slow, normal and fast) for each subject was acquired by the accelerometer embedded in cell phone which was attached to the person's hip. Data analysis was based on gait cycles that were detected first. Cumulants of order from 1 to 4 with different number of lags were calculated. Feature vectors for classification were built using dimension reduction on calculated cumulants by principal component analysis (PCA). The classification was accomplished by support vector machines (SVM) with radial basis kernel. According to portion of variance covered in the calculated principal components, different lengths of feature vectors were tested. Six healthy young subjects participated in the experiment. The average person recognition rate based on gait classification was 90.3±3.2%. A similarity measure for discerning different walking types of the same subject was also introduced using dimension reduction on accelerometer data by PCA.

关键词： Principal component analysis

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