检索结果-内蒙古大学图书馆

IEEE International Conference on Microelectronic Test Structures

作者： B. Iniguez Z. Xu T. Fjeldly M.S. Shur Electrical Computer and System Engineering Department Rensselaer Polytechnic Institute Troy NY USA Microelectronics Laboratory University of Louvain Louvain-la-Neuve Belgium Center for Technology at Kjeller Norwegian University of Science and Technology Kjeller Norway

We describe direct extraction techniques for the most important parameters of a new physics-based polysilicon (poly-Si) TFT model, suitable for circuit simulation. The physics-based model covers all operating regimes using continuous functions, includes short-channel effects and has been validated for devices of channel lengths down to 2 /spl mu/m. In spite of a small parameter set, the model includes the necessary dependencies on channel length.

关键词： Parameter extraction Thin film transistors Threshold voltage Integrated circuit modeling Equations Grain boundaries systems engineering and theory Laboratories Circuit simulation Application specific integrated circuits

来源：评论

学校读者我要写书评

暂无评论

Frequency domain subspace model identification using the w -operator

引用

IFAC Proceedings Volumes 1999年第2期32卷 3986-3991页

作者： Zi-Jiang Yang Kiyoshi Wada Faculty of Computer Engineering and System Science Kyushu Institute of Technology Iizuka Fukuoka 820-8502 TEL+81-948-29-7672 FAX+81-948-29-7651 Japan Department of Electrical and Electronic Systems Engineering Graduate School of Information Science and Electrical Engineering Kyushu University Hakozaki Fukuoka 812 Japan

This paper proposes an efficient and convenient approach to frequency domain subspace identification for continuous-time systems. In the case of continuous-time models, the data matrices often become ill-conditioned if we simply rewrite the Laplace operator s as s = jw where w denotes the frequency. To avoid the ill-conditioned problem, the operator w = ( s - b.α)/( s + b.α) is introduced such that the system can be identified based on a state-space model in the w -operator. And then the estimated w -operator state-space model can be transformed back to the common continuous-time state-space model. An instrumental variable matrix in the frequency domain is also proposed to obtain consistent estimate in the presence of measurement noise.

关键词： Subspace model identification frequency domain continuous-time system w -operator Instrumental variable

来源：评论

学校读者我要写书评

暂无评论

Measurement of TeV electrons on ISS/JEM

引用

AIP Conference Proceedings 1999年第1期458卷 127-132页

作者： S. Torii N. Tateyama T. Tamura T. Ouchi K. Kashiwagi K. Yoshida K. Hibino T. Yamagami Y. Saito H. Murakami T. Kobayashi Y. Komori K. Kasahara T. Yuda M. Ohnishi M. Shibata J. Nishimura 1Institute of Physics Department of Industrial Engineering and Management and Institute of Computer Science Kanagawa University Yokohama Kanagawa 221-8686 Japan 2Institute of Space and Astronautical Science Sagamihara Kanagawa 229-8510 Japan 3Department of Physics Rikkyo University Tokyo 171-8501 Japan 4Department of Physics Aoyama-gakuin University Tokyo 157-8672 Japan 5Kanagawa Prefectural College of Nursing Yokohama Kanagawa 241 Japan 6Department of System Engineering Shibaura Institute of Technology Omiya Saitama 330-8570 Japan 7Institute for Cosmic Ray Research University of Tokyo Tanashi Tokyo 188-8502 Japan 8Department of Physics Yokahama National University Yokohama Kanagawa 240-0067 Japan 9Yamagata Institute of Technology Yamagata 993 Japan

By using the JEM (Japanese Experiment Module) facility on ISS, we are planning to carry out a precise measurement of the flux and energy spectrum of cosmic-ray electrons of 10 GeV to several TeV. Since the electrons over several 100 GeV could be contributed only from the nearby sources within a distance less than 1 kpc, it is expected in the high energy region that the energy spectrum has a structural component and the distribution of the arrival directions presents anisotropy. By helping to localize and identify the nearest cosmic ray sources, these data should help to resolve the long-term puzzle. The instrument used for the observation is a kind of scintilating-fiber/lead imaging calorimeter that has been used for the balloon observations. We are developing an improved detector having a geometrical factor of 0.5 m2sr and a higher rejection power against the background protons (⩾104). It is expected to observe nearly 500 electrons over 1 TeV during the one-year observation.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A dual rail circuits synthesis environment for the implementation of multiple output boolean functions

引用

International Journal of Circuit Theory and Applications 1999年第4期26卷

作者： Theodore Karoubalis George Ph. Alexiou Nick Kanopoulos Computer Technology Institute 26221 Patras & Department of Computer Engineering and Informatics University of Patras 26500 Patras Greece Center for Digital System Engineering Research Triangle Institute Research Triangle Park NC 27709 U.S.A.

This paper presents an integrated CAD system for synthesizing high-performance dual rail circuits using DCVS logic. The proposed techniques exploit ROBDDs to provide efficient DCVS trees that fulfill the design rules and constraints. Sharing of common transistor structures is examined to decrease further the overall device count and chip area by improving the wirability of DCVS circuits. This is accomplished by generating a common variable ordering that permits identification of common subcircuits and simplification of routing procedures by enhancing straight-line wiring of input signals. The paper also presents the integration steps that are undertaken for importing the developed tools into Alliance CAD system, in order to provide a complete and consistent DCVS circuits synthesis environment and methodology. Moreover, experimental results showed that the proposed algorithms, which are time and memory efficient, produce near optimal device counts improving placement and routing procedures. The integrated design framework, which is available for academic and research purposes, has been employed to synthesize, simulate and layout a programmable 16-bit serial/parallel multiplier as a complete DCVS circuit synthesis example. © 1998 John Wiley & Sons, Ltd.

关键词：

来源：评论

学校读者我要写书评

暂无评论

An Efficient Method for Version Control of a Tree Data Structure

引用

Software: Practice and Experience 1999年第7期27卷

作者： ESTHER JINEE CHOI YONG RAE KWON Software Engineering Division System Engineering Research Institute P.O. Box 1 Yusong-gu Taejon 305-333 Korea Department of Computer Science Korea Advanced Institute of Science and Technology (KAIST) Korea

A new method for version controlling of a tree structure is presented. The key feature of the method is that the latest state of a tree is retained and other versions are constructed from it on request, and information on the change history of a node is maintaind in its parent node. Several algorithms for efficient manipulation of the tree have been developed, and it has been demonstrated that they correctly manipulate the tree. The performance of these algorithms has been compared with those of other tree-based methods, and found to be nearly optimal in all aspects of the comparison. © 1997 John Wiley & Sons, Ltd.

关键词： tree structure change management history version control

来源：评论

学校读者我要写书评

暂无评论

Evaluation of autonomic nervous system with correlation diagram of R-R interval and P-R interval

Evaluation of autonomic nervous system with correlation diag...

引用

Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： H. Fujisawa T. Uozumi K. Ono Department of Computer Science and System Engineering Muroran Institute of Technology Japan

We developed and examined a new method to evaluate the cooperation between sinoatrial node (SA node) and atrioventricular node (AV node) with a correlation diagram of R-R and P-R interval which we newly developed. Twenty healthy subjects were examined. Electrocardiograph was measured during supine rest, sitting rest, and submaximal exercise by an electrically braked cycle ergometer. One subject was selectively blocked autonomic nervous system (ANS) by pharmacological agents. The correlation diagram of R-R and P-R interval was plotted by beat-to-beat. We also evaluated both sympathetic nervous activity (SNS) and parasympathetic nervous activity (PNS) with spectral analysis of R-R interval variability during exercise. According to the correlation diagrams, both R-R interval and P-R interval decreased with progress of exercise intensity, and these showed nonlinearity. The correlation diagram for PNS blockade was overlapped on physiological response. PNS activities decreased to near zero at halfway of exercise by spectral analysis. SNS activities rapidly increased when PNS activities near zero. The correlation diagram was useful for evaluation of cooperation between SA and AV node because it reflected ANS activity. It is indicated that the cooperation between SA and AV node will be evaluated with the correlation diagram and spectral analysis together.

关键词： Autonomic nervous system Heart rate variability Electrocardiography Spectral analysis Heart rate Frequency National electric code computer science systems engineering and theory Electric variables measurement

来源：评论

学校读者我要写书评

暂无评论

Understanding end-to-end Internet traffic dynamics

Understanding end-to-end Internet traffic dynamics

引用

IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： J. Andren M. Hilding D. Veitch Department of Computer Engineering Chalmers University of Technology Gothenburg Sweden Department of Communication System Lund Institute of Technology Lund Sweden Software Engineering Research Centre Carlton VIC Australia

An investigative tool for the direct study of end-to-end Internet traffic is presented, featuring a hybrid timing mechanism allowing high resolution time-stamping of packet departures in a UNIX environment. A method for the elimination of timing artifacts due to variations in clock rates, essential for the study of delay, is also presented. A preliminary report is gives on the detailed structure of end-to-end delay and loss processes using the tool. A number of consistent properties of interest are found including long range dependence in delay and a very simple structure for loss.

关键词： Internet Timing Clocks Protocols Synchronization Fractals State estimation Delay Telecommunication traffic Sampling methods

来源：评论

学校读者我要写书评

暂无评论

Exciton localization in InGaN quantum well devices

引用

Journal of Vacuum Science & technology B: Microelectronics Processing and Phenomena 1998年第4期16卷 2204-2204页

作者： Chichibu, Shigefusa Sota, Takayuki Wada, Kazumi Nakamura, Shuji Materials Department University of California Santa Barbara California 93106 Faculty of Science and Technology Science University of Tokyo Noda Chiba 278-8510 Japan Department of Electrical Electronics and Computer Engineering Waseda University Shinjuku Tokyo 169-8555 Japan Compound Semiconductor Materials Research NTT System Electronics Laboratories Atsugi Kanagawa 243-0198 Japan Department of Research and Development Nichia Chemical Industries Limited Kaminaka Anan Tokushima 774-8601 Japan

Emission mechanisms of a device-quality quantum well (QW) structure and bulk three dimensional (3D) InGaN materials grown on sapphire substrates without any epitaxial lateral overgrown GaN base layers were investigated. The InxGa1−xN layers showed various degrees of in-plane spatial potential (band gap) inhomogeneity, which is due to a compositional fluctuation or a few monolayers thickness fluctuation. The degree of fluctuation changed remarkably around a nominal InN molar fraction x=0.2, which changes to nearly 0.08–0.1 for the strained InxGa1−xN. This potential fluctuation induces localized energy states both in the QW and 3D InGaN, showing a large Stokes-like shift. The spontaneous emission from undoped InGaN single QW light-emitting diodes (LEDs), undoped 3D LEDs, and multiple QW (MQW) laser diode (LD) wafers was assigned as being due to the recombination of excitons localized at the potential minima, whose lateral size was determined by cathodoluminescence mapping to vary from less than 60 to 300 nm in QWs. Those structures are referred to as quantum disks (Q disks) or segmented QWs depending on the lateral size. Blueshift of the emission peak by an increase of the driving current was explained to be combined effects of band filling of the localized states by excitons and Coulomb screening of the quantum confined Stark effect induced by the piezoelectric field. The lasing mechanisms of the continuous wave In0.15Ga0.85N MQW LDs having small potential fluctuations can be described by the well-known electron-hole-plasma (EHP) picture. However, the inhomogeneous MQW LDs are considered to lase by EHP in segmented QWs or Q disks. It is desirable to use entire QW planes with small potential inhomogeneity as gain media for higher performance LD operation.

关键词：

来源：评论

学校读者我要写书评

暂无评论

New Petri net controller for distributed Petri net

New Petri net controller for distributed Petri net

引用

Annual Conference of Industrial Electronics Society

作者： Y. Dohi W. Takano T. Horiguchi H. Murakoshi Division of Electrical and Computer Engineering Faculty of Engineering Yokohama National University Hodogaya Yokohama Japan Department of Electronic System Engineering Tokyo Metropolitan Institute Technology Hino Tokyo Japan

When a large Petri net system is implemented, several LSI Petri net controllers are used and connected in order to build a whole system. For this purpose, the authors propose a new Petri net controller, which can hold much more places than the one proposed before. It also has the new control of tokens for kill-arc and shared-places among sub Petri nets are also proposed. Four accessible registers of tokens makes it possible to access four tokens at the same time, so one can use place-numbers instead of bit-patterns of places as used by the previous controller. This reduces the memory to log n/n of the previous. The new control of tokens makes it easy to keep consistency of tokens among a group of sub Petri net controllers. One can implement LSI Petri net controllers for several time larger Petri nets than previous ones and it is as fast as previous controllers.

关键词： Distributed control Large scale integration Control systems Process control Switches Petri nets Registers Fires Valves Safety

来源：评论

学校读者我要写书评

暂无评论

Image retrieval system using impression words

Image retrieval system using impression words

引用

IEEE International Conference on systems, Man and Cybernetics

作者： K. Yoshida T. Kato T. Yanaru Department of Computer Engineering Kyushu Institute of Technology Fukuoka Japan Intelligent Systems Division Electro Technical Laboratory Tsukuba Ibaraki Japan Department of Industrial System and Engineering Chuo University Bunkyo Tokyo Japan

This paper introduces the image database system which can retrieve using impression words. ART MUSEUM (Multimedia Database with Sense of Color and Construction upon the Matter of ART) is our prototype system for advanced image database. It allows users to retrieve images from a database of impressionist paintings by using adjective words. The system learns the correlation between the feature of sample paintings and user's descriptions, and provides interactive and progressive learning mechanisms. We show the interesting experimental results on ART MUSEUM system.

关键词： Image retrieval Subspace constraints Image databases Painting Information retrieval Art Cities and towns Indexes computer industry Intelligent systems

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：