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5th International Conference on Natural Computation, ICNC 2009

作者： Zou, Baixian Miao, Jun Yang, Xiaoling Duan, Lijuan Qiao, Yuanhua Department of Information Science and Technology College of Arts and Science of Beijing Union University Beijing 100083 China Key Laboratory of Intelligent Information Processing Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China Tianjin Academy of Agricultural Science Tianjin 300192 China College of Computer Science and Technology Beijing University of Technology Beijing 100022 China College of Applied Science Beijing University of Technology Beijing 100022 China

ISBN: (纸本)9780769537368

Sparse coding has high-performance encoding and ability to express images, sparse encoding basis vector plays a crucial role. The computational complexity of the most existing sparse coding basis vectors of is relatively large. In order to reduce the computational complexity and save the time to train basis vectors. A new Hebbian rules based method for computation of sparse coding basis vectors is proposed in this paper. A two-layer neural network is constructed to implement the task. The main idea of our work is to learn basis vectors by removing the redundancy of all initial vectors using Hebbian rules. The experiments on natural images prove that the proposed method is effective for sparse coding basis learning. It has the smaller computational complexity compared with the previous work. © 2009 IEEE.

关键词： Computational complexity

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Highly stable bottom-gate nanocrystalline silicon thin film transistor fabricated employing ICP-CVD

Highly stable bottom-gate nanocrystalline silicon thin film ...

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Thin Film Transistors 9, TFT 9 - 214th ECS Meeting

作者： Kim, Sun-Jae Han, Sang-Myeon Kwon, Jang-Yeon Jung, Ji-Sim Hana, Min-Koo Department of Electrical Engineering and Computer Science Seoul National University Seoul 151-741 Korea Republic of Display Device and Processing Lab. Samsung Advanced Institute of Technology Yong-In 446-712 Korea Republic of

ISBN: (纸本)9781566776554

Bottom-gate nanocrystalline silicon (nc-Si) thin film transistors (TFTs) were fabricated and evaluated their characteristics and electrical stability under various stress condition. nc-Si with high crystallinity was deposited employing Inductively coupled plasma chemical vapor deposition(ICP-CVD) system. We employed helium gas diluted deposition and all the process temperature was kept under 350°C. We fabricated conventional inverted-staggered nc-Si TFTs. Fabricated nc-Si TFTs showed fine electrical characteristics, such as electrical mobility of 0.64-0.77 cm2/***. We investigated its stability through constant-voltage stress and constant-current stress. The threshold voltage shift after 30, 000 seconds gate bias (10V) stress was only 0.098V, which is considerably less compared to a-Si:H TFT. Under the static current stress condition, the threshold voltage of the nc-Si TFT was shifted less than that of a-Si:H TFT. It demonstrates that nc-Si TFT exhibit better stability than conventional a-Si:H TFT. ©The Electrochemical Society.

关键词： Thin film transistors

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Geographical information engineering in the 21st century

Geographical information engineering in the 21st century

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Symposium in Honor of Andrew U. Frank on the Occasion of his 60th Birthday, 2008

作者： Câmara, Gilberto Vinhas, Lúbia Davis, Clodoveu Fonseca, Fred Carneiro, Tiago Image Processing Division São José dos Campos Brazil Computer Science Department Federal University of Minas Gerais Belo Horizonte Brazil College of Information Sciences and Technology Pennsylvania State University State College United States Computer Science Institute Federal University of Ouro Preto Brazil

ISBN: (纸本)9783642375323

This paper discusses the challenges facing GIS designers in the 21st century. We argue that GI engineers lack a sound theoretical basis that would allow them to make best use of new technologies that handle geospatial data. Considering three important topics for the new generations of GIS (change, semantics, and cognition) we show that GIS theory is in a state of flux. Thus, researchers and engineers need to cooperate more for the new generation of GIS to be built in the best possible way. © Springer-Verlag Berlin Heidelberg 2009.

关键词： Geographic information systems

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A real-time architecture for dual-microphone speech enhancement systems

A real-time architecture for dual-microphone speech enhancem...

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IEEE GCC Conference & Exhibition

作者： Mohsen Rahmani Nima Yousefian Ahmad Akbari Beghdad Ayad Audio and Speech Processing Laboratory Computer Engineering Department Iran University of Science and Technology Iran

In this paper, we propose a real-time architecture for a dual-microphone speech enhancement to be employed in a hands-free mobile communication. The proposed method is based on a new SNR estimation and a coherence based Voice Activity Detector (VAD). The enhancement system was implemented using MATLAB tools and DSP processors. The results show that these two implementations are comparable in terms of PESQ score. We also calculate the computational complexity of the enhancement method. The obtained results show that the proposed method is suitable from the hardware implementation point of view.

关键词： Microphones Noise Speech Coherence Estimation Noise measurement Speech enhancement

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Power level difference as a criterion for speech enhancement

Power level difference as a criterion for speech enhancement

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International Conference on Acoustics, Speech, and Signal processing (ICASSP)

作者： Nima Yousefian Mohsen Rahmani Ahmad Akbari Audio and Speech Processing Laboratory Computer Engineering Department Iran University of Science and Technology Iran

This paper deals with the problem of speech enhancement in near field condition, when two microphones are available. Proposed technique relies on the difference in power of received signals at the two microphones. This difference is employed to estimate the clean speech signal power. The method has the capability of dealing with non-stationary noise, a drawback of many noise reduction techniques. Superiority of the presented method over some of prominent methods in this field is demonstrated by conducting both subjective and objective quality tests.

关键词： Speech enhancement Acoustic noise Noise reduction Low-frequency noise Working environment noise Fourier transforms Equations Array signal processing Microphone arrays Speech processing

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TCBC: Trap Caching Bounds Checking for C

TCBC: Trap Caching Bounds Checking for C

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IEEE International Symposium on Dependable, Autonomic and Secure Computing (DASC)

作者： Yoshitaka Arahori Katsuhiko Gondow Hideo Maejima Department of Computer Science Tokyo Institute of Technology Tokyo Japan Department of Information Processing Tokyo Institute of Technology Tokyo Japan

In this paper, we propose a debugging technique for C, which can dynamically find boundary errors on strings in a highly-compatible, accurate and efficient manner. The main idea of our technique is to effectively keep track of hazardous memory bounds (called trap regions) using a small table (called a trap cache) on the static section of the instrumented program. We have implemented our technique as an extension of GCC4.1.1 and conducted experiments. The results show that our technique was easily applicable even to large real programs including Apache 1.3.37 and Linux 2.6.20.4 without requiring significant manual effort, it successfully detected all of ten known boundary errors in them with no false positives, and it incurred low run-time overheads (average 17%) for their benchmarks.

关键词： Runtime Debugging Instruments Linux Security computer science Information processing computer errors Manuals Prototypes

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computer Aided Composition System with Interactive Selective Population Climbing

Computer Aided Composition System with Interactive Selective...

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computer science and Information Engineering, CSIE, WRI World Congress on FLAGGED

作者： Hiroshi Hasui Department of Computer Science and Systems Engineering Language Processing Laboratory Muroran Institute of Technology Muroran Japan

In this work, we are developing the computer aided composition system. This system aids a person, which knows cellphone or background music of home page or software. This system is implemented with the interactive selective population climbing. We suppose that it is appropriate to fetch the favorite melody by hill climbing, because we believe that the function about favor in the human can express the proximate single-peak function for acceleration. However, the user's favorite melodies are sometimes changed, as the user's favor becomes clear. Thus, the system selects a real parent from many parents in proportion of these evaluation values in order to fetch the favorite melody during keeping variety interatively, whenever the system generates neibour solutions of the real parent. If the value of neibour solution is higher than one of the real parent, the system exchanges the neibour solution from the real parent. The composing model generates the neibour solutions with randomwalk or most likelihood method in order to change the image of the real parent a little. In the experiment, the melody of 8 measures were composed by evaluating about 30 melodies and improving about 20 melodies. We assume that my system can compose the melody by less burden than other systems.

关键词： computer science Acceleration Systems engineering and theory Laboratories Cellular phones Humans

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Generating high-coverage semantic orientation lexicons from overtly marked words and a thesaurus

Generating high-coverage semantic orientation lexicons from ...

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2009 Conference on Empirical Methods in Natural Language processing, EMNLP 2009, Held in Conjunction with ACL-IJCNLP 2009

作者： Mohammad, Saif Dunne, Cody Dorr, Bonnie Laboratory for Computational Linguistics and Information Processing University of Maryland United States Human-Computer Interaction Lab. University of Maryland United States Institute for Advanced Computer Studies University of Maryland United States Department of Computer Science University of Maryland United States Human Language Technology Center of Excellence United States

Sentiment analysis often relies on a semantic orientation lexicon of positive and negative words. A number of approaches have been proposed for creating such lexicons, but they tend to be computationally expensive, and usually rely on significant manual annotation and large corpora. Most of these methods use WordNet. In contrast, we propose a simple approach to generate a high-coverage semantic orientation lexicon, which includes both individual words and multi-word expressions, using only a Roget-like thesaurus and a handful of affixes. Further, the lexicon has properties that support the Polyanna Hypothesis. Using the General Inquirer as gold standard, we show that our lexicon has 14 percentage points more correct entries than the leading WordNet-based high-coverage lexicon (SentiWordNet). In an extrinsic evaluation, we obtain significantly higher performance in determining phrase polarity using our thesaurus-based lexicon than with any other. Additionally, we explore the use of visualization techniques to gain insight into the our algorithm beyond the evaluations mentioned above. © 2009 ACL and AFNLP.

关键词： Thesauri

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Quasimonoenergetic Proton Bunch Generation by Dual-Peaked Electrostatic-Field Acceleration in Foils Irradiated by an Intense Linearly Polarized Laser

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Physical Review Letters 2010年第6期105卷 065003-065003页

作者： H. B. Zhuo (卓红斌) Z. L. Chen (陈正林) W. Yu (余玮) Z. M. Sheng (盛政明) M. Y. Yu (郁明阳) Z. Jin (金展) R. Kodama (兒玉了祐) Graduate School of Engineering Osaka University 2-1 Yamada-oka Suita Osaka 565-0871 Japan National Laboratory for Parallel and Distributed Processing School of Computer Science National University of Defense Technology Changsha 410073 People’s Republic of China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 People’s Republic of China Department of Physics Shanghai Jiao Tong University Shanghai 200240 People’s Republic of China Beijing National Laboratory for Condensed Matter Physics Institute of Physics CAS Beijing 100080 People’s Republic of China Institute for Fusion Theory and Simulation Zhejiang University Hangzhou 310027 People’s Republic of China Institute for Theoretical Physics I Ruhr University Bochum D-44780 Germany Institute of Laser Engineering Osaka University 2-6 Yamada-oka Suita Osaka 565-0871 Japan

It is found that stable proton acceleration from a thin foil irradiated by a linearly polarized ultraintense laser can be realized for appropriate foil thickness and laser intensity. A dual-peaked electrostatic field, originating from the oscillating and nonoscillating components of the laser ponderomotive force, is formed around the foil surfaces. This field combines radiation-pressure acceleration and target normal sheath acceleration to produce a single quasimonoenergetic ion bunch. A criterion for this mechanism to be operative is obtained and verified by two-dimensional particle-in-cell simulation. At a laser intensity of ∼5.5×1022 W/cm2, quasimonoenergetic GeV proton bunches are obtained with ∼100 MeV energy spread, less than 4° spatial divergence, and ∼50% energy conversion efficiency from the laser.

关键词： Germanium compounds

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On separating glottal source and vocal tract information in telephony speaker verification

On separating glottal source and vocal tract information in ...

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International Conference on Acoustics, Speech, and Signal processing (ICASSP)

作者： Tomi Kinnunen Paavo Alku Department of Computer Science and Statistics University of Joensuu Finland Department of Signal Processing and Acoustics Helsinki University of Technology Finland

The popular mel-frequency cepstral coefficients (MFCCs) capture a mixture of speaker-related, phonemic and channel information. Speaker-related information could be further broken down according to articulatory criteria. How these underlying components are exactly mixed in the features is not well understood. To this end, in this paper we aim at separating the spectra of glottal source and vocal tract using glottal inverse filtering, with an application to speaker recognition over telephone lines. Our experiments on the 10 sec-10 sec condition of the NIST 2006 SRE corpus suggest that the mel-frequency cepstrum of the voice source is not too useful for recognizing speakers. On the contrary, fusing the vocal tract spectrum with conventional MFCCs improves accuracy, suggesting that vocal tract information should be enhanced.

关键词： Telephony Cepstral analysis Speaker recognition Filtering Filters Cepstrum Speech recognition Mel frequency cepstral coefficient Error analysis Inverse problems

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