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A class-based queueing service for IEEE 802.11e wireless networks

A class-based queueing service for IEEE 802.11e wireless net...

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IEEE Conference on Vehicular Technology (VTC)

作者： Chyouhnwa Chen Huei-Wen Ferng Jun-Chuan Chen Hao-Lun Chin D. Shiung Dept. of Comput. Sci. & Inf. Eng. Nat. Taiwan Univ. of Sci. Taipei Taiwan Department of Computer Science and Information Engineering National Taiwan University of Science and Technology Taipei Taiwan Novatek Microelectronics Corp. Hsin-Chu Taiwan

In order to fairly access a shared wireless channel and allocate network resources, resource management mechanisms are required for controlling link-sharing in wireless local area networks (WLANs), which are expected to support real-time and multimedia applications. We then propose, in this paper, an extended class-based queueing (CBQ) service, based on a controlled hierarchical link-sharing model with a QoS-aware IEEE 802.11e MAC protocol to support sharing of the link bandwidth among different users in a distributed manner. Dynamically adjusting parameters in IEEE 802.11e, e.g., AIFS, CW/sub min/, and CW/sub max/, which are used to control the probability of accessing the channel, our scheme is able to achieve fair channel sharing. Using a simulation approach, we demonstrate the fairness improvement of our scheme is good.

关键词： Wireless networks Channel allocation Traffic control Scheduling Resource management Media Access Protocol Bandwidth World Wide Web computer science Electronic mail

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A study on etching profiles of sacrificial layers

A study on etching profiles of sacrificial layers

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International Conference on Solid-State and Integrated Circuit Technology

作者： Wu Chang-ju Jin Zhoug-he Ma Hui-lian Wang Yue-lin Department of Information Science & Electronic Engineering Zhejiang University Hangzhou China Zhejiang University Hangzhou Zhejiang CN Dept. of Inf. Sci. & Electron. Eng. Zhejiang Univ. Hangzhou China

ISBN: (纸本)078038511X

Chemical etching of sacrificial layers is a widely used technique in surface micromachining. The causes of the triangle at the etch front are analyzed. The viewpoint that stress is the major factor of the triangle's formation is put forward. Through a study of the mechanism of the effects of annealing on etch rate, several rules about different annealing conditions having different effects on the etch rate are advanced.

关键词： Etching Annealing Stress Machining Microchannel Plasma measurements Microscopy Tiles Plasma temperature Gravity

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MD16: DSP with some RISC features for embedded system

MD16: DSP with some RISC features for embedded system

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International Conference on Signal Processing Proceedings (ICSP)

作者： Jicheng Chen Qingdong Yao Peng Liu Ce Chi Department of Information Science and Electronic Engineering Zhejiang University Hangzhou China Zhejiang University Hangzhou Zhejiang CN Dept. of Inf. Sci. & Electron. Eng. Zhejiang Univ. Hangzhou China

To achieve the high performance/cost ratio, the idea of combining the advantages of DSP and RISC in a single architecture is a solution for the booming and versatile embedded application systems. The existent methods that appear in many literatures all focus on the construction of mixed architecture with RISC basement. Contrary to the above, a new idea of constructing architecture with DSP basement and supplementing it with some RISC features is put up in this paper. It can exert the advantages of DSP architecture by instruction level parallelization and powerful memory access capability, and obtain RISC good high-level language support by the manners of local-homogenous register set and RISC-like pipeline. To accelerate the DSP design and optimize the system, integrated design system (IDS) is presented to complete the hardware/software co-design and co-validation. Application programs can also be rapidly developed based on the integrated development environment (IDF). The behavior level simulation of the DSP system has been completed. It is given as 150 MIPS under the condition of 0.18 /spl mu/m technology library. FPGA validation is also accomplished.

关键词： Digital signal processing Reduced instruction set computing Embedded system Costs computer architecture High level languages Registers Pipelines Acceleration Design optimization

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Tunnel minimization and relay for managing virtual private networks

Tunnel minimization and relay for managing virtual private n...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： I-Wei Chen Ying-Dar Lin Yl-Neng Lin Department of Computer and Information Science National Chiao Tung University Hsinchu Taiwan National Chiao Tung University Hsinchu TW Dept. of Comput. & Inf. Sci. Nat. Chiao Tung Univ. Hsinchu Taiwan

A virtual private network (VPN) is a private data network, that carries traffic between remote sites. One of the most popular VPN applications is the "intranet/extranet VPN", which establishes network layer connections between remote intranet sites, using various tunneling protocols, to create an IP overlay network. IPSec, which is very prevalent in the industry, is one of these tunneling protocols that not only provide encapsulation/decapsulation but encryption/decryption and hashing, However, an IPSec tunnel often fails to be established due to the management complexity. The paper proposes a new concept of authority to alleviate the management overhead by reducing the number of tunnels. The problem of tunnel minimization is first formalized under three conditions - no constraint, a tunnel path length constraint and a tunnel relay degree constraint - and is then solved using graphical models and the zero-one integer programming algorithm. The effect of tunnel minimization is also investigated, and at most 90% of the tunnels are found to be reducible in a general enterprise VPN.

关键词： Relays Virtual private networks Tunneling Protocols Telecommunication traffic Extranets Encapsulation Cryptography Minimization methods Graphical models

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FTF-IDF scoring for fresh inf.rmation retrieval

FTF-IDF scoring for fresh information retrieval

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International Conference on Advanced inf.rmation Networking and Applications (AINA)

作者： N. Sato M. Euhara Y. Sakai Department of Information and Computer Sciences Toyo University JAPAN Toyo Daigaku Bunkyo-ku Tokyo JP Dept. of Inf. & Comput. Sci. Toyo Univ. Japan Graduate School of Agricultural Science Tohoku University JAPAN

For most businesses, fresh inf.rmation retrieval is very important. However, it is difficult for conventional search engines based on centralized architecture to retrieve really fresh inf.rmation, because they take a long time to collect documents via Web robots. In contrast to a centralized architecture, a search engine based on a distributed architecture does not need to collect documents, because each site independently makes an index. As this result, distributed search engines can retrieve really fresh inf.rmation. However, fast indexing is not enough to easily retrieve fresh inf.rmation. The value of inf.rmation is determined by both freshness and relevance. Traditional ranking methods consider either freshness or relevance; so, we proposed FTFIDF (fresh term frequency multiplied by inverse document frequency) as a scoring method that considers both freshness and relevance.

关键词： inf.rmation retrieval Search engines Content based retrieval Frequency computer architecture Service oriented architecture Robots Indexing Web pages inf.rmation theory

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Embedded program testing in untestable mobile environment: an experience of trustworthiness approach

Embedded program testing in untestable mobile environment: a...

引用

Asia-Pacific Conference on Software engineering

作者： K.R.P.H. Leung J.K.-Y. Ng W.L. Yeung Dept. of Inf. & Commun. Technol. Hong Kong Inst. of Vocational Educ. China Department of Computer Science Hong Kong Baptist University Hong Kong China Department of Information Systems Lingnan University Hong Kong China

Comparing actual output with the expected output of some controlled input is a fundamental principle of program correctness testing. However, in some situations, the input is uncontrollable or even undetectable during testing and, hence, it is impossible to decide the expected output or the test oracle. We encountered this problem when we developed programs to extract network data from various mobile stations in the mobile location estimation system project. We propose testing the trustworthiness of the programs instead. Since the input is uncontrollable and undetectable, program output is analyzed and challenged against with the intrinsic properties, environment, the program output itself and their application results, to find evidence that the output is suitable to be used for the planned purposes. Furthermore, in the case of mobile software development, it is common that different programs of the same specification have to be developed for mobile stations of different models. These different implementations provide another source of reference for trustworthiness tests. Our experience of applying trustworthiness test in extracting network data from mobile stations is reported in this paper.

关键词： System testing Software testing Data mining Programming Humans Benchmark testing Laboratories Communications technology computer science education Educational programs

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A comparison between SIP and network layer mobility management protocols in IP-based wireless networks

A comparison between SIP and network layer mobility manageme...

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Fifth IEE International Conference on 3G Mobile Communication Technologies

作者： Y.-H. Huang J.-Y. Chen W.-S. Chen C.-C. Yang H.-T. Chu Department of Information Networking Technology Hsiuping Institute of Technology Taichung Taiwan Dept. of Inf. Networking Technol. Hsiuping Inst. of Technol. Taichung Taiwan Department of Computer Science and Information Engineering National Chi Nan University Nantou Taiwan VIPCCL Department of Electrical Engineering National Chi Nan University Nantou Taiwan

We address two important components of mobility management: location management and handoff management. Location management including update and paging enables the network to discover the current attachment point of the mobile user for call delivery. Furthermore, we divide the process of location management into two phases. The first phase deals with location update or registration so that the MN periodically notifies the network of its new access point, allowing the network to authenticate the user and revise the user's current location. The second phase performs packet delivery. Here the network is queried for the user's location and the packets are forwarded to the current position of the MN. Handoff management enables the network to maintain a user's connection as the mobile terminal continues to move and change its access points or base stations to the network. Moreover, we bring a number of factors in designing an efficient mobility management protocol, inf.uencing handoff performance. They include handoff control, packet loss and duplication, radio behavior, signaling overhead, path efficiency, passive connectivity and paging.

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Unsupervised segmentation of the POL-SAR image using similarity parameters in sequential projection pursuit model

Unsupervised segmentation of the POL-SAR image using similar...

引用

International Conference on Signal Processing Proceedings (ICSP)

作者： Wei Lin Zheng Tian Xian-bin Wen Fan He Northwestern Polytechnical University Xi'an Shaanxi CN Dept. of Math. & Inf. Sci. Northwestern Polytech. Univ. Xi'an China Department of Computer Science and Technology Northwestern Polytechnical University Xi'an China Department of Mathematics and Information Science Northwestern Polytechnical University Xi'an China

A sequential projection pursuit model (SPPM) for unsupervised segmentation of the polarimetric synthetic aperture radar (POL-SAR) image is proposed in this paper. The features of the high dimension data are extracted out via orthogonal projection and the classification is accomplished by the Bayesian decision rule. Also the similarity parameters of POL-data are expressed as the characters of a target and form new target data. The SPPM utilizes new target data to classify the target into various subclasses. Good-segmented results have been obtained for the POL-SAR image processing. The segmented results using the SPPM are better than that of using entropy-alpha plane.

关键词： Image segmentation Radar scattering Scattering parameters Mathematical model Remote sensing Radar imaging Statistical distributions Reflection Entropy Vectors

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Double spline muscle models for human face animation based on video analysis

Double spline muscle models for human face animation based o...

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International Symposium on Intelligent Multimedia, Video and Speech Processing

作者： Sy-sen Tang A.W.-C. Liew Hong Ya Department of Computer Engineering and Information Technology City University of Hong Kong Kowloon Hong Kong City University of Hong Kong Kowloon HK Dept. of Comput. Eng. & Inf. Technol. City Univ. of Hong Kong Kowloon China

Facial animation has been widely used in different areas such as entertainment and teleconferencing. Using video data to control facial animation is an interesting and difficult problem. In this paper, a novel double B-spline (NURBS) muscle system is proposed to simulate a 3D facial expression and talking animation based on video images. This system can simulate many different expressions of the elastic human face. Each muscle is constructed by two non-uniform rational B-spline curves, which better approximate the real muscle system. There are 14 feature points to represent facial expressions and we apply a lip contour extraction technique to determine lip shapes.

关键词： Facial animation Spline Muscles Humans Face Surface topography Surface reconstruction Solid modeling Shape control Skin

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A new mobility management scheme for mobile IP-based wireless networks

A new mobility management scheme for mobile IP-based wireles...

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Fifth IEE International Conference on 3G Mobile Communication Technologies

作者： J.-Y. Chen W.-S. Chen Y.-H. Huang C.-C. Yang H.-T. Chu Dept. of Comput. Sci. & Inf. Eng. Nat. Chi Nan Univ. Nantou Taiwan Department of Information Networking Technology Hsiuping Institute of Technology Taichung Taiwan Department of Computer Science and Information Engineering National Chi Nan University Nantou Taiwan VIPCCL Department of Electrical Engineering National Chi Nan University Nantou Taiwan

This paper introduces two new approaches, co-operated with the mobile routing table (MRT), for optimizing the routing path such that the triangular routing problem is avoided. The first approach combines an ICMP network-mask query and directed broadcast mechanism to find the routers. The other approach uses a tracking mechanism, similar to traceroute, to find all the MRT routers on the path from home agent to corresponding node. We analyze and compare both the standard mobile IP (MIP) and the proposed scheme. It is clear that the proposed scheme acts like the MIP in the worst case, and like the MIP-route optimization in the best case.

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