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2008 Asia and South Pacific Design Automation Conference, ASP-DAC

作者： Zhang, Ling Liu, Jianhua Zhu, Haikun Cheng, Chung-Kuan Hashimoto, Masanori Dept. Computer Science and Engineering Univ. of California San Diego San Diego CA 92093 United States Altera Corp. San Jose CA 95134 United States Qualcomm Inc. San Diego CA 92121 United States Dept. Information Systems Engineering Osaka University Osaka 565-0871 Japan

ISBN: (纸本)9781424419227

This paper presents a new logic style, named Current-Mode Differential logic (CMDL), that achieves both high operating speed and low power consumption. Inspired by the low-voltage swing (LVS) logic, CMDL uses a shunt resistor at the differential output to obtain constant low swing signal without the need to reset low. Furthermore, conditional shunt transistors are used for the internal nodes to prevent high-voltage swing, thus entirely eliminate the power-hungry clocked reset network in LVS circuits. We show that the CMDL is suitable for high-end microprocessor integer core by providing three datapath modules implemented in CMDL. Our simulation results indicate that, operating at comparable speed with LVS logic, CMDL circuits can achieve up to 50% reduction of delay-power product compared to CMOS logic and LVS logic. In addition, CMDL reduces the power consumption of LVS by up to 40%. ©2008 IEEE.

关键词： Electric power utilization

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Meta-modeling in multiobjective optimization

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作者： Knowles, Joshua Nakayama, Hirotaka School of Computer Science University of Manchester Oxford Road Manchester M13 9PL United Kingdom Dept. of Information Science and Systems Engineering Konan University 8-9-1 Okamoto Higashinada Kobe 658-8501 Japan

ISBN: (纸本)3540889078

In many practical engineering design and other scientific optimization problems, the objective function is not given in closed form in terms of the design variables. Given the value of the design variables, the value of the objective function is obtained by some numerical analysis, such as structural analysis, fluidmechanic analysis, thermodynamic analysis, and so on. It may even be obtained by conducting a real (physical) experiment and taking direct measurements. Usually, these evaluations are considerably more time-consuming than evaluations of closed-form functions. In order to make the number of evaluations as few as possible, we may combine iterative search with meta-modeling. The objective function is modeled during optimization by fitting a function through the evaluated points. This model is then used to help predict the value of future search points, so that high performance regions of design space can be identified more rapidly. In this chapter, a survey of meta-modeling approaches and their suitability to specific problem contexts is given. The aspects of dimensionality, noise, expensiveness of evaluations and others, are related to choice of methods. For the multiobjective version of the meta-modeling problem, further aspects must be considered, such as how to define improvement in a Pareto approximation set, and how to model each objective function. The possibility of interactive methods combining meta-modeling with decision-making is also covered. Two example applications are included. One is a multiobjective biochemistry problem, involving instrument optimization;the other relates to seismic design in the reinforcement of cable-stayed bridges. © 2008 Springer Berlin Heidelberg.

关键词： Cable stayed bridges

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Concrete examples of abstraction as manifested in students' transformative experiences 08

Concrete examples of abstraction as manifested in students' ...

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4th International Computing Education Research Workshop, ICER'08

作者： Moström, Jan Erik Boustedt, Jonas Eckerdal, Anna McCartney, Robert Sanders, Kate Thomas, Lynda Zander, Carol Department of Computing Science Umea University 901 87 Umea Sweden Dept. of Mathematics Natural and Computer Science Högskolan i Gävle S80176 Gävle Sweden Department of Information Technology Uppsala University Uppsala Sweden Dept. of Computer Science and Engineering University of Connecticut Storrs CT United States Department of Math and Computer Science Rhode Island College Providence RI United States Department of Computer Science Aberystwyth University Aberystwyth United Kingdom Computing and Software Systems University of Washington Bothell Bothell WA United States

ISBN: (纸本)9781605582160

This paper examines transformational learning experiences of computing students as a way to better understand threshold concepts in computing. From empirical evidence we found that students often describe transformative experiences as learning situations in which they were led to use various kinds of abstraction, for example modularity, data abstraction, inheritance, polymorphism, reuse, design patterns, and complexity. Some students describe an abstract concept as coming first, and then needing to be made concrete though application;others describe transformations in which they learn the advantages of these abstract concepts from their experience of not using them. Abstraction is certainly of central importance in computer science. It appears, however, from our students' descriptions of transformative experiences, that abstraction per se is not a threshold, but that particular concepts in which abstraction is paramount exhibit the characteristics of threshold concepts. Copyright 2008 ACM.

关键词： Students

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Representing and validating digital business processes

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2008年 4891卷 219-246页

作者： Bodenstaff, Lianne Ceravolo, Paolo Damiani, Ernesto Fugazza, Cristiano Reed, Karl Wombacher, Andreas Information Systems Group Dept. of Computer Science University of Twente Netherlands Dept. of Information Technologies Universit degli Studi Milan Italy Computer Science Dept LaTrobe University Melbourne Australia School of Computer and Communication Sciences Ecole Polytechnique F´ed´erale de Lausanne Switzerland

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A graphics-user interface in support of a cognitive inference architecture

A graphics-user interface in support of a cognitive inferenc...

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21st International Conference on computer Applications in Industry and engineering, CAINE 2008

作者： Lombera, Isaí Michel Patel, Jayeshkumar Rubin, Stuart Chen, Shu-Ching Lee, Gordon Dept. of Electrical And Computer Engineering San Diego State University 5500 Campanile Drive San Diego CA 92182 United States Dept. of Computer Science San Diego State University 5500 Campanile Drive San Diego CA 92182 United States SPAWAR Systems Center 53560 Hull Street San Diego CA 92152 United States Dept. of Computing and Information Sciences Florida International University Miami FL 33199 United States

ISBN: (纸本)9781605606170

The objective of this paper is to present a graphical-user-interface (GUI) in support of a decision support system (KASER) for machine understanding. In order to provide information between the user and the KASER during the learning process, the approach is to combine information science and cognitive science in the form of several virtual and physical multimedia screens (e.g., a whiteboard running a pen-based OS ensemble, a menu-driven touch-screen, or a multimedia output screen). The touch-screen will also facilitate navigation between virtual screens. An application to homeland security is provided as an example;however the approach has vast applicability to many problems in which a graphical form of learning is required. The integration between human and machine is to be seamless which allows the user to pose questions and retrieve answers through the multimedia system, thus accelerating the learning process.

关键词： Multimedia systems

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An architecture of photo core transform in HD photo coding system for embedded systems.of various bandwidths

An architecture of photo core transform in HD photo coding s...

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IEEE Asia-Pacific Conference on Circuits and systems

作者： Koichi Hattori Hiroshi Tsutsui Hiroyuki Ochi Yukihiro Nakamura Dept. of Communications and Computer Engineering Graduate School of Informatics Kyoto University Sakyo Kyoto Japan Dept. of Information Systems Engineering Graduate School of Information Science and Technology Osaka University Suita Osaka Japan Research Organization of Science and Engineering Ritsumeikan University Shiga Japan Research Organization of Science and Engineering Ritsumeikan University Kusatsu Shiga Japan

In this paper, we propose a novel architecture of photo core transform (PCT) which is used as transformation of image data into frequency domain in HD Photo, an emerging image coding system developed by Microsoft. In order to support various memory bus bandwidths used in system-on-a-chip (SoC) design, an implementation for each bandwidth can be derived based on our architecture. In addition, in order to reduce the local memory size and the traffic between the main and local memories, we propose a novel data transfer and storing scheme for PCT. The experimental results show that hardware modules corresponding to the given bus bandwidths can be reasonably derived from the proposed architecture.

关键词： High definition video Embedded system Bandwidth Image coding Discrete transforms Frequency domain analysis System-on-a-chip Data engineering Hardware Streaming media

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The Degrees of Freedom of Wireless Networks: information-theoretic and Physical Limits

The Degrees of Freedom of Wireless Networks: Information-the...

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Annual Allerton Conference on Communication, Control, and Computing

作者： Massimo Franceschetti Marco D. Migliore Paolo Minero Advanced Network Science group (ANS) of the California Institute of Telecommunications and Information Technologies (CALIT2) Dept. of Electrical and Computer Engineering University of California Microwave Laboratory at the DAEIMI University of Cassino

ISBN: (纸本)9781424429257

It is shown from first principles and without relying on stochastic fading channel models that the number of spatial degrees of freedom of wireless networks can in principle grow linearly with the number of nodes, provided that the network is surrounded by a rich scattering environment. Hence, linear capacity scaling is physically possible in certain three dimensional geometries. However, it is also noted that these geometric configurations provide a physical possibility, but might be far from practical reality.

关键词： Degree of freedom Wireless networks Freedom Ganglia Fading channels Linearly Geometric forms

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Optimal Fractional Order Proportional Integral Controller for Varying Time-Delay systems

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IFAC Proceedings Volumes 2008年第2期41卷 4910-4915页

作者： Varsha Bhambhani YangQuan Chen Dingyü Xue Center for Self-Organizing and Intelligent Systems(CSOIS) Dept. of Electrical and Computer Engineering Utah State University 4120 Old Main Hill Logan UT 84322-4120 USA Faculty of Information Science and Engineering Northeastern University Shenyang 110004 P. R. China

In many industrial processes, the first order plus time delay (FOPDT) is still being widely used. FOPDT systems.are also called “KLT systems.(gain, delay, and time constant).” Considering uncertainties in the time delay, this paper attempts to answer this research question: “ Will a fractional order controller help and do better? “ In this paper, we first focus on fractional order proportional and integral controller (FOPI) for varying time-delay systems. Based on our previously proposed FOPI controller tuning rules using fractional M s constrained integral gain optimization (F-MIGO), we tried to simultaneously maximize the jitter margin and ITAE performance (minimize ITAE performance index) for a set of hundred KLT systems.having different time-constants and time-delay values. We observed that the optimization results in enlarged jitter margin of all systems.at expense of a slight decrease in ITAE performance of delay dominated systems. Further, the F-MIGO optimization based tuning rules were summarized by approximation of optimized gain parameters and fractional orders α of the FOPI controller. Simulation results are presented to verify the proposed new tuning rules for best jitter margin and ITAE performance.

关键词： Fractional calculus fractional order controller varying time-delay system FMIGO algorithm multi-objective Optimization jitter margin ITAE performance index

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ShapeShop: Sketch-based solid modeling with BlobTrees

ShapeShop: Sketch-based solid modeling with BlobTrees

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ACM SIGGRAPH 2007 - International Conference on computer Graphics and Interactive Techniques

作者： Schmidt, R. Wyvill, B. Sousa, M.C. Jorge, J.A. Dept. Computer Science University of Calgary Canada Dept. Information Systems and Computer Engineering TU Lisbon Portugal

Various systems.have explored the idea of inferring 3D models from sketched 2D outlines. In all of these systems.the underlying modeling methodology limits the complexity of models that can be created interactively. The ShapeShop sketch-based modeling system utilizes Hierarchical Implicit Volume Models (BlobTrees) as an underlying shape representation. The BlobTree framework supports interactive creation of complex, detailed solid models with arbitrary topology. A new technique is described for inflating 2D contours into rounded three-dimensional implicit volumes. Sketch-based modeling operations are defined that combine these basic shapes using standard blending and CSG operators. Since the underlying volume hierarchy is by definition a construction history, individual sketched components can be non-linearly edited and removed. For example, holes can be interactively dragged through a shape. ShapeShop also provides 2D drawing assistance using a new curve-sketching system based on variational contours. A wide range of models can be sketched with ShapeShop, from cartoon-like characters to detailed mechanical parts. Examples are shown which demonstrate significantly higher model complexity than existing systems. © The Eurographics Association 2005.

关键词： Blending

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Sampling point-set implicits 4

Sampling point-set implicits

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Point-Based Graphics 2007, PBG 2007

作者： Proença, J. Jorge, J.A. Sousa, M.C. Dept. Information Systems and Computer Engineering TU Lisbon Portugal Dept. Computer Science University of Calgary Canada

ISBN: (纸本)9783905673517

We present a novel approach for point-set implicit surface sampling that is able to rapidly distribute particles over the surface of 3D objects. Our methods benefit from the inner structure of a MPU implicit to obtain a near-optimal initial distribution, with higher densities in areas of higher complexity. The adequate number of particles to effectively sample the surface is determined almost automatically and in accordance to the surface characteristics. We also use the MPU information to obtain local surface complexity heuristics that are used in the simulation stage of the particle system. Shape modeling operations are directly supported and the redistribution of particles is very fast for local edits. We present performance results that show that our system is faster than other state-of-the art approaches for the same number of points. © The Eurographics Association 2007.

关键词： Geometry

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