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SiGe and Ge: Materials, processing, and Devices - 210th Electrochemical Society Meeting

作者： Kärtner, F.X. Byun, H. Grawert, F.J. Gopinath, J.T. Shen, H.M. Ippen, E.P. Akiyama, S. Liu, J. Wada, K. Kimerling, L.C. Department of Electrical Engineering and Computer Science Research Laboratory of Electronics Massachusetts Institute of Technology Cambridge MA 02139 United States Materials Processing Center Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 United States

ISBN: (纸本)1566775078

Silicon-Germanium saturable absorber mirrors are developed for laser mode locking. The fabrication process is fashioned such that a highly reflecting Si/SiO2 Bragg mirror with a crystalline absorber top-layer is generated. One step of wafer-bonding allows for subsequent epitaxial growth on the mirror. A six-pair reflector centered at 1400 nm with 99.8% peak reflectivity, a 99%-reflectivity bandwidth of 700 nm and a surface roughness of 0.136 nm is demonstrated. A thin Germanium layer is epitaxially deposited on the mirror surface to provide saturable absorption at 1550nm. with a sub-picosecond recovery time. The device is used to achieve stable, continuously modelocked operation of an Er-Yb:glass laser centered at 1540 nm, generating 220 fs pulses. Copyright The Electrochemical Society.

关键词： Mirrors

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Network anomalous intrusion detection using Fuzzy-Bayes

Network anomalous intrusion detection using Fuzzy-Bayes

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4th IFIP TCI2 International Conference on Intelligent Information processing, IIP 2006

作者： Adetunmbi, Adebayo O. Shi, Zhiwei Shi, Zhongzhi Adewale, Oiumide S. Key Laboratory of Intelligent Information Processing Institute of Computing Technology CAS Beijing 100080 China Department of Computer Science Federal University of Technology Ondo State Nigeria

Security of networking systems has been an issue since computer networl

ISBN: (纸本)9780387446394

Security of networking systems has been an issue since computer networl

关键词： Intrusion detection

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Predistorter design employing parallel piecewise linear structure and inverse coordinate mapping for broadband communications

Predistorter design employing parallel piecewise linear stru...

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14th European Signal processing Conference, EUSIPCO 2006

作者： Cheong, Mei Yen Werner, Stefan Laakso, Timo I. Cousseau, Juan Figueroa, Jose L. Signal Processing Laboratory Center of Excellence Helsinki University of Technology Finland CONICET Department of Electrical Engineering and Computer Science Universidad Nacional Del sur Bahía Blanca Argentina

This paper proposes a low-complexity predistorter (PD) for compensation of both the AM/AM and the AM/PM conversions with memory. The nonlinear power amplifier (PA) is modeled as a Wiener type nonlinearity. The quasi-static nonlinearities are modeled using a class of piecewise linear (PWL) functions. The PWL function facilitates an efficient PD identification algorithm. The proposed algorithm involves a novel inverse coordinate mapping (ICM) method that maps the nonlinear characteristics of the PA to that of the PD, and parameter estimations that do not require matrix inversion. The indirect learning architecture is used to provide an on-line compensation of thememory effect of the PA. Simulation results show that the PD that compensates also the AM/PM distortion performs significantly better than one that considers only the AM/AM nonlinearity. The proposed PD is also shown to outperform the orthogonal polynomial PD in both adjacent channel interference suppression and inband distortion compensation.

关键词： Power amplifiers

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Speckle reduction of polarimetric SAR images based on neural ICA

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13th International Conference on Neural Information processing, ICONIP 2006

作者： Jian, Ji Zheng, Tian Department of Computer Science and Technology Northwestern Polytechnical University Xi'an 710072 China Department of Applied Mathematics Northwestern Polytechnical University Xi'an 710072 China Key Laboratory of Education Ministry for Image Processing and Intelligent Control Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)3540464816

The polarimetric synthetic aperture radar (PSAR) images are modeled by a mixture model that results from the product of two independent models, one characterizes the target response and the other characterizes the speckle phenomenon. For the scene interpretation, it is desirable to separate between the target response and the speckle. For this purpose, we proposed a new speckle reduction approach using independent component analysis (ICA) based on statistical formulation of PSAR image. In addition, we apply four ICA algorithms on real PSAR images and compare their performances. The comparison reveals characteristic differences between the studied neural ICA algorithms, complementing the results obtained earlier. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Synthetic aperture radar

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Robust ICA neural network and application on Synthetic Aperture Radar (SAR) image analysis

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13th International Conference on Neural Information processing, ICONIP 2006

ISBN: (纸本)3540464816

Independent component analysis (ICA) has shown success in the separation of sources in lots of applications. However, in synthenic aperture radar (SAR) images the noise is multiplicative, so the applicability of ICA is seriously reduced. This paper proposes a new robust independent component analysis neural network (RICANN) that improves the robustness of ICA by adding outlier rejection rule. Its application in synthetic aperture radar (SAR) is discussed. The results show the potential usage in SAR image processing problems. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Synthetic aperture radar

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The graph-theoretical properties of partitions and information entropy

The graph-theoretical properties of partitions and informati...

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High-Power Diode Laser technology and Applications IV

作者： Cao, Cungen Sui, Yuefei Xia, Youming Key Laboratory of Intelligent Information Processing Institute of Computing Technology Chinese Academy of Sciences Beijing 100080 China Department of Computer Science Yunnan Normal University Kunming 650092 Yunnan China

ISBN: (纸本)0819461466

The information entropy, as a measurement of the average amount of information contained in an information system, is used in the classification of objects and the analysis of information systems. The information entropy of a partition is non-increasing when the partition is refined, and is related to rough sets by Wong and Ziarko. The partitions and information entropy have some graph-theoretical properties. Given a non-empty universe U, all the partitions G on U are taken as nodes, and a relation V between partitions are defined and taken as edges. The graph obtained is denoted by (G, V), which represents the connections between partitions on U. According to the values of the information entropy of partitions, a directed graph (G, V&rarr) is defined on (G, V). It will be proved that there is a set of partitions with the minimal entropy;and a set of partitions with the maximal entropy;and the entropy is non-decreasing on any directed pathes in (G, V) from a partition with the minimal entropy to one of the partitions with the maximal entropy. Hence, in (G, V), the information entropy of partitions is represented in a clearly structured way. © Springer-Verlag Berlin Heidelberg 2005 Information systems, information entropy, classification, partitions.

关键词： Information analysis

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Coherent concurrent tasks scheduling and resources assignment in dependable computer systems design

Coherent concurrent tasks scheduling and resources assignmen...

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作者： Drabowski, Mieczyslaw Wantuch, Edward Department of Computer Engineering Cracow University of Technology Warszawska 24 Krakow 31-155 Poland Institute of Computing Science Cracow University of Technology Jana Pawla II 37 Krakow 31-864 Poland Department of Computer Engineering Faculty of Electrical and Computer Engineering Cracow University of Technology Polish Information Processing Society IT Technologies Department Institute of Computing Sciences Polish Academy of Engineers Polish Academy of Art and Sciences Technical Sciences Commission

The paper includes a proposal of a new model of coherent concurrent tasks scheduling and a of resources assignment, that are characteristic for the problem of dependable system synthesis. Optimal tasks scheduling, partition at resources, allocation tasks and resources are basic problems in high-level synthesis of computer systems. Coherent synthesis may have a practical application in developing tools for computer aided rapid prototyping of such systems. © World Scientific Publishing Company.

关键词： computer aided software engineering

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A privacy-enhanced access control

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Systems and computers in Japan 2006年第5期37卷 77-86页

作者： Saito, Takamichi Umesawa, Kentaro Okuno, Hiroshi G. Department of Computer Science Faculty of Science and Technology Meiji University Kawasaki 214-8571 Japan Graduate School of Science and Technology Science University of Tokyo Noda 278-8510 Japan Department of Intelligence Science and Technology Graduate School of Informatics Kyoto University Information Processing Society of Japan

It is sometimes necessary to access a server anonymously when the Internet or an electronic commerce application is used. In the present paper, for this need there is proposed a new system that uses an SPKI (Simple Public Key Infrastructure) framework in order to provide service with an emphasis on privacy. The proposed system does not require ID information and other personal information to be presented to the server. In short, only the information relating to the corresponding service is included in the certificate submitted to the server for utilization of the service, and not the ID information of the client. However, even though this is a system of anonymous access, it is not a framework that allows unlimited access, such as anonymous FTP (File Transfer Protocol). The SPKI framework itself only determines the format of the certificate, and does not provide a methodology for selecting or managing users. Therefore, in this paper, a new framework is proposed, and controlled anonymous access is shown to be obtainable by this framework. This paper will also discuss advantages of the proposed system, its anonymity, management, security, and the processing for certificate revocation. © 2006 Wiley Periodicals, Inc.

关键词： Data privacy

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Formalization for Granular Computing Based on Logical Formulas

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南昌工程学院学报 2006年第2期25卷 60-65页

作者： Lin Yan Qing Liu Key Laboratory for Intelligent Information Processing College of Computer and Information Technology Henan Normal University Xinxiang 453007 China Department o f Computer Science Nanchang University Nanchang 330029 China

In order to make formalization for granular computing,some kinds of formulas are constructed on a universe by a logical method. Every formula expresses a property, and can separate a semantic set which consists of all of the objects satisfying the *** a granular space on the universe is produced based on the formulas, and the semantic sets separated by the formulas are taken as a formal definition for granules,and are called abstract ***,it is proved that any specific granule from an extended mathematical system can be formalized into an abstract granule,the conclusions is obtained that specific granules from approximate spaces and information systems can also be formalized into abstract granules. Based on a granular space and abstract granules,granular computing is defined,which finally realizes the goal of formalization for granular computing.

关键词： abstract granule specific granule granular space formula granular coputing

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Improving rapid unsupervised speaker adaptation based on HMM-sufficient statistics in noisy environments using multi-template models

Improving rapid unsupervised speaker adaptation based on HMM...

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作者： Gomez, Randy Lee, Akinobu Toda, Tomoki Saruwatari, Hiroshi Shikano, Kiyohiro Nara Institute of Science and Technology Ikoma-shi 630-0192 Japan Nagoya Institute of Technology Nagoya-shi 466-8555 Japan Speech and Acoustics Laboratory Nara Institute of Science and Technology Japan Department of Computer Science and Engineering Nagoya Institute of Technology Japan Information Processing Society of Japan Japan Acoustical Society of Japan Japan Graduate School of Information Science Nara Institute of Science and Technology Japan ATR Spoken Language Communication Research Laboratories Japan ISCA VR Society of Japan Japan Japan International Speech Communication Society

This paper describes the method of using multi-template unsupervised speaker adaptation based on HMM-Sufficient Statistics to push up the adaptation performance while keeping adaptation time within few seconds with just one arbitrary utterance. This adaptation scheme is mainly composed of two processes. The first part is done offline which involves the training of multiple class-dependent acoustic models and the creation of speakers' HMM-Sufficient Statistics based on gender and age. The second part is performed online where adaptation begins using the single utterance of a test speaker. From this utterance, the system will classify the speaker's class and consequently select the N-best neighbor speakers close to the utterance using Gaussian Mixture Models (GMM). The classified speakers' class template model is then adopted as a base model. From this template model, the adapted model is rapidly constructed using the N-best neighbor speakers' HMM-Sufficient Statistics. Experiments in noisy environment conditions with 20 dB, 15 dB and 10 dB SNR office, crowd, booth, and car noise are performed. The proposed multi-template method achieved 89.5% word accuracy rate compared with 88.1% of the conventional single-template method, while the baseline recognition rate without adaptation is 86.4%. Moreover, experiments using Vocal Tract Length Normalization (VTLN) and supervised Maximum Likelihood Linear Regression (MLLR) are also compared. Copyright © 2006 The Institute of Electronics, Information and Communication Engineers.

关键词： Acoustic wave effects

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