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IEEE Conference on Wireless Communications and Networking

作者： Ehsan Haghani Nirwan Ansari Shyam Parekh Doru Colin Advanced Networking Lab Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA Bell Laboratories Alcatel-Lucent Technologies Inc. Murray Hill NJ USA

ISBN: (纸本)9781424463961;9781424463985

With increasing implementation of broadband wireless networks and extensive deployment of multimedia services such as Video on Demand (VoD) or IPTV, the demand for video streaming applications will increase and more people will use their wireless devices to reach numerous video contents available in the Internet. Streaming real-time video in wireless networks is a challenging problem due to the stringent service requirements of video traffic and impairments of wireless channels. Providing the required Quality of Service (QoS) through efficient resource allocation is a complicated problem that service providers are confronting. In this paper, we propose a traffic-aware, cross-layer solution for enhancing the perceived video quality at the end user in wireless networks. Our solution incorporates the characteristics of the MPEG traffic to give more priority to the more important frames and to protect them against dropping when available resources of the network are not sufficient for providing the desired QoS to the traffic flow. It is shown that the proposed solution will improve the perceived video quality over the broadband wireless networks.

关键词： Telecommunication traffic Streaming media Wireless networks Video on demand Quality of service IPTV IP networks Web and internet services Resource management Protection

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Document clustering with semantic features and fuzzy association

Communications in Computer and Information Science

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Communications in computer and Information Science 2010年 54卷 167-175页

作者： Park, Sun An, Dong Un Cha, ByungRea Kim, Chul-Won Advanced Graduate Education Center of Jeonbuk for Electronics and Information Technology BK21 Chonbuk National University Korea Republic of Division of Electronic and Information Engineering Chonbuk National University Korea Republic of Network Media Lab. GIST Korea Republic of Department of Computer Engineering Honam University Korea Republic of

ISBN: (纸本)9783642120343

This paper proposes a new document clustering method using the semantic features and fuzzy association. The proposed method can improve the quality of document clustering because the clustered documents by using fuzzy association values to distinguish well dissimilar documents, the selected cluster label term by semantic features, which is used in document clustering, can represent an inherent structure of document set better. The experimental results demonstrate that the proposed method achieves better performance than other document clustering methods. © 2010 Springer-Verlag Berlin Heidelberg.

关键词： Cluster analysis

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Determination of channel capacity and optimum source distribution of fiber-optic channel

Determination of channel capacity and optimum source distrib...

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International Conference on Transparent Optical Networks

作者： Jianyong Zhang Ivan B. Djordjevic Hussam G. Batshon ShuiSheng Jian Key lab of All optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing China Department of Electrical & Computer Engineering University of Arizona Tucson USA Institute of Lightwave Technology Beijing Jiaotong University Beijing China

ISBN: (纸本)9781424477999

We describe a general engineering method to compute a tighter bound on fiber-optic channel capacity and the optimum source distribution. This method first determines the conditional probability density functions of an optical fiber channel by evaluating histograms, or by instantons or edgeworth expansion approach. Starting from any source distribution, we generate source and output sequences to estimate the information rate and calculate A-posteriori State-Transition Weight. The optimum source distribution is obtained by constrained stochastic Arimoto-Blahut algorithm. We apply the proposed methods on a 64 iterative polarization quantization source. The optimized capacity per single-polarization per channel is higher than achievable information rate. As the transmission distance increases the optimized distribution is changed from Gaussian-like distribution to non-Gaussian-like distribution. This is due to the fact that the nonlinear interaction of ASE noise and Kerr nonlinearities cannot be compensated for by back-propagation method.

关键词： Channel capacity Optical fibers Optical fiber polarization Information rates Distributed computing Probability density function Histograms State estimation Stochastic processes Iterative algorithms

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Performance of BPSK Subcarrier Intensity Modulation Free-Space Optical Communications using a Log-normal Atmospheric Turbulence Model

Performance of BPSK Subcarrier Intensity Modulation Free-Spa...

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Photonics and Optoelectronics, SOPO

作者： X. Tang S. Rajbhandari W. O. Popoola Z. Ghassemlooy E. Leitgeb S. S. Muhammad G. Kandus Optical Communications Research Group School of Computing Engineering & Information Sciences Northumbria University Newcastle UK Computer and Emerging Sciences (FAST-NU) National University Lahore Pakistan Department of Optical Science and Engineering and Key Lab for Advanced Photonic Materials and Devices Graz University of Technology Graz Austria Department of Communication Systems Jožef Stefan Institute Ljubljana Slovenia

ISBN: (纸本)9781424449637

In this paper, we present simulation results for the bit error rate (BER) performance and the fading penalty of a BPSK subcarrier intensity modulation (BPSK-SIM) free-space optical (FSO) communication link in a log-normal atmospheric turbulence model. The results obtained are based on the Monte-Carlo simulation. Multiple subcarrier modulation schemes offer increased system throughput and require no knowledge of the channel fading in deciding what symbol has been received. In an atmospheric channel with a fading strength σ l 2 of 0.1 obtaining a BER of 10 -6 using a 2-subcarrier system will require a signal-tonoise (SNR) of 23.1 dB. The required SNR increases with the fading strength and at a BER of 10 -9 the fading penalty due to the atmospheric turbulence is ~ 41 dB for σ l 2 = 0.9. The comparative studies of the OOK and BPSK-SIM schemes showed that for similar electrical SNR, BPSK-SIM offered improved performance across all range of turbulence variance.

关键词： Binary phase shift keying Intensity modulation Optical fiber communication Atmospheric modeling Fading Bit error rate Apertures Optical attenuators Optical modulation Optical scattering

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Bleeding detection in wireless capsule endoscopy images by support vector classifier

Bleeding detection in wireless capsule endoscopy images by s...

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International Conference on Information and Automation (ICIA)

作者： Lei Cui Chao Hu Yuexian Zou Max Q.-H. Meng Department of Computer and Information Engineering Shenzhen Graduate School Peking University Shenzhen China Shenzhen Key Lab for Low-Cost Health Shenzhen Institutes of Advanced Integration Technology Chinese Academy and Sciences Shenzhen China Chinese University of Hong Kong Shenzhen Hong Kong China Department of Electronic Engineering Chinese University of Hong Kong New Territories Hong Kong China

Wireless capsule endoscopy (WCE) is a great breakthrough for Gastrointestinal (GI) Tract diagnoses, and it can view the entire gastrointestinal tract, especially the small intestine without invasiveness and sedation. However, a tough problem associated with this new technology is that too many images to be inspected by naked eyes cause a huge burden to physicians, so it is significant to find an automatic diagnosis method. In this paper, a new automatic algorithm for bleeding detection in WCE images is proposed. This new approach mainly focuses on color feature which is also a very effective clue used by physicians for diagnosis. We propose six color features in HSI color space to discriminate between bleeding and normal status. Then we use support vector classifier to verify the performance of the proposed features and judge the status of the images. Experimental results show that the proposed features and classification method is effective and the average accuracy can achieve approximately 97%.

关键词： Hemorrhaging Endoscopes Diseases Gastrointestinal tract Intestines Chaos Eyes Digestive system Automation Static VAr compensators

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Camera movement for chasing a subject with unknown behavior based on real-time viewpoint goodness evaluation

Camera movement for chasing a subject with unknown behavior ...

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作者： Ozaki, Maya Gobeawan, Like Kitaoka, Shinya Hamazaki, Hirofumi Kitamura, Yoshifumi Lindeman, Robert W. Human Interface Engineering Lab. Osaka University 2-1 Yamadaoka 565-0871 Suita Osaka Japan Advanced Computing Institute of High Performance Computing Fusionopolis 1 Fusionopolis Way 138632 Singapore Singapore Sharp Corporation 22-22 Nagaike-cho 545-8522 Abeno-ku Osaka Japan Research Institute of Electrical Communication Tohoku University 2-1-1 Katahira 980-8577 Aoba-ku Sendai Japan Computer Science Worcester Polytechnic Institute 100 Institute Road Worcester MA 01609-2280 United States

We propose a method that automatically generates a smooth chase camera movement to follow a subject, a user-controlled character or a character with unknown behaviors, in a 3D environment freely in real time. We consider three objectives in generating the smooth-camera movement: to avoid collisions with obstacles, to avoid subject occlusions, and to choose a good viewpoint for looking at the subject. We evaluate the goodness of viewpoints by using a viewpoint entropy map and choose the best viewpoint as the goal position of the camera in real time. Afterwards, we move the camera toward the goal position by following the shortest path, found by the A* algorithm, on a roadmap graph. The resulting camera movement has a high degree of freedom and fulfills the three objectives above. Our method is effective for third-person-view 3D applications in tracking the real-time movement of user-controlled characters in exploring a 3D environment. © Springer-Verlag 2010.

关键词： Motion planning

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Measurement sites for wafer map visualization and process Monitoring

IEEJ Transactions on Electronics, Information and Systems

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IEEJ Transactions on Electronics, Information and Systems 2010年第11期130卷 1987-1993+13页

作者： Ono, Makoto Hayashi, Hirohito Kondo, Akira Hamaguchi, Daisuke Kaneko, ShuN'Ichi Production Engineering Research Lab. Hitachi Ltd. 292 Yoshida-cho Totsuka-ku Yokohama-shi Kanagawa 244-0817 Japan Dept. of Computer and Information Sciences Tokyo University of Agriculture and Technology 2-24-16 Naka-cho Koganei-shi Tokyo 184-8588 Japan Hitachi Global Storage Technologies Japan Ltd. 2880 Kozu Odawara-shi Kanagawa 256-8510 Japan Hitachi Advanced Digital Inc. 292 Yoshida-cho Totsuka-ku Yokohama-shi Kanagawa 244-0817 Japan Graduate School of Information Science and Technology Hokkaido University Kita-14 Nishi-9 Kita-ku Sapporo-shi Hokkaido 060-0814 Japan

This paper proposes measurement site selection to visualize a wafer characterization map and also monitor wafer-to-wafer and batch-to-batch variation. In the manufacturing line of thin film devices such as large-scale integrated circuits, magnetic heads of hard disk drives and thin-film-transistor substrates of liquid-crystal projectors, several critical dimensions are generally measured and monitored for quality control. To monitor wafer-to-wafer and batch-to-batch variation, engineers control average and standard deviation of measured dimensions as statistical process control. To monitor characterization across a wafer, the engineers observe an sculptured surface as a wafer map. The paper presents a selection method to decide measurement sites across a wafer for both of the wafer map visualization and the process monitoring and examines their accuracies experimentally. © 2010 The Institute of Electrical Engineers of Japan.

关键词： Thin films

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Compressive image super-resolution

Compressive image super-resolution

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43rd Asilomar Conference on Signals, Systems and computers

作者： Sen, Pradeep Darabi, Soheil Department of Electrical and Computer Engineering Advanced Graphics Lab University of New Mexico NM United States

ISBN: (纸本)9781424458271

This paper proposes a new algorithm to generate a super-resolution image from a single, low-resolution input without the use of a training data set. We do this by exploiting the fact that the image is highly compressible in the wavelet domain and leverage recent results of compressed sensing (CS) theory to make an accurate estimate of the original high-resolution image. Unfortunately, traditional CS approaches do not allow direct use of a wavelet compression basis because of the coherency between the point-samples from the downsampling process and the wavelet basis. To overcome this problem, we incorporate the downsampling low-pass filter into our measurement matrix, which decreases coherency between the bases. To invert the downsampling process, we use the appropriate inverse filter and solve for the high-resolution image using a greedy, matching-pursuit algorithm. The result is a simple and efficient algorithm that can generate high quality, high-resolution images without the use of training data. We present results that show the improved performance of our method over existing super-resolution approaches. © 2009 IEEE.

关键词： Compressed sensing

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XPM statistics in 100% pre-compensated WDM transmission for different modulation formats and transmission fibres

XPM statistics in 100% pre-compensated WDM transmission for ...

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2009 14th OptoElectronics and Communications Conference, OECC 2009

作者： Fan, Zhang State Key Lab. of Advanced Optical Communication Systems and Networks School of Electronics Engineering and Computer Science Peking University Beijing 100871 China

XPM statistics in 100% pre-compensated WDM transmission depends on bit rates, transmission fibres and modulation formats. XPM in DPSK systems shows much less stochastic than that in OOK systems. © 2009 IEEE.

ISBN: (纸本)9781424441037

关键词： Stochastic systems

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Measurement of surface resistivity/conductivity of Si waver by optical interferometry techniques

Measurement of surface resistivity/conductivity of Si waver ...

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Nondestructive Characterization for Composite Materials, Aerospace engineering, Civil Infrastructure, and Homeland Security 2009

作者： Habib, K. Habib, S. Materials Science Lab. Department of Advanced Systems KISR P.O.Box 24885 Safat 13109 Kuwait Computer Engineering Department Kuwait University Kuwait

ISBN: (纸本)9780819475541

Optical interferometry techniques can be use for the first time to measure the surface resistivity/conductivity of silicon wavers without any physical contact. This can be achieved by applying an electrical potential across the waver and measuring the electronic current flow across the waver as a result of the electrical potential. In the mean time, optical iterferometry techniques such as holographic interferometry can be used in situ to measure the orthogonal surface displacement of the waver, as a result of the applied electrical potential. In addition, a mathematical model can be derived in order to correlate the ratio of the electrical potential to the electronic current flow (electrical potential/electronic Current flow=resistance) and to the surface (orthogonal) displacement of the waver. In other words, a proportionality constant (surface resistivity or conductivity=1/ surface resistivity) between the measured electrical resistance and the surface displacement (by the optical interferometry techniques) can be obtained. Consequently the surface resistivity/ and conductivity of the waver can be determined, without any physical contact. © 2009 SPIE.

关键词： Surface measurement

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