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Multi-scale surface representation of point-sampled geometry

Multi-scale surface representation of point-sampled geometry

引用

ISPA 2005 - 4th International Symposium on Image and Signal Processing and Analysis

作者： Zhang, Dian-Hua Yue, Tian Chen, Yong-Hui Dep. of Computer Science Southwest University of Science and Technology Mianyang 621010 China

ISBN: (纸本)953184089X

With increasing complexity of 3D geometric models and growing demand for advanced modeling functionality, significant effort is being devoted to the design of efficient, reliable, and scalable algorithms for digital geometry processing. We introduce a multi-scale surface representation that enables sophisticated editing functionality at different approximation levels, using the concept of scale-space. The key issue is the interconnection between successive levels in the hierarchy. We use a fairing operator-a geometric low-pass filter to generate successively smoother approximation levels of a given input surface, and use a decomposition operator to encode each level relative to the next smoother level using normal displacements to ensure intuitive detail preservation. As a result, users can edit the surface at different approximation levels to perform coarse-scale edits on the whole model as well as very localized modifications on the surface detail.

关键词： Digital signal processing

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Towards improving trust in context-aware systems by displaying system confidence 05

Towards improving trust in context-aware systems by displayi...

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7th International Conference on Human computer Interaction with Mobile Devices and Services, MobileHCI 05

作者： Antifakos, Stavros Kern, Nicky Schiele, Bernt Schwaninger, Adrian Dep. of Computer Science ETH Zurich Switzerland Dep. of Computer Science Darmstadt University of Technology Germany Max Planck Institute for Biological Cybernetics 72076 Tübingen Germany

ISBN: (纸本)1595930892

For automatic or context-aware systems a major issue is user trust, which is to a large extent determined by system reliability. For systems based on sensor input which are inherently uncertain or even uncomplete there is little hope that they will ever be perfectly reliable. In this paper we test the hypothesis if explicitly displaying the current confidence of the system increases the usability of such systems. For the example of a context-aware mobile phone, the experiments show that displaying confidence information increases the user's trust in the system. Copyright 2005 ACM.

关键词： User interfaces

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Compile-time energy reduction techniques based on voltage scaling characteristic

Compile-time energy reduction techniques based on voltage sc...

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IASTED International Conference on Software Engineering: part of the 23rd IASTED International Multi-Conference on Applied Informatics, SE 2005

作者： Lei, Ting Li, Xi Hu, Xiao Zhou, Xue-Hai Dep. of Computer Science and Technology University of Science and Technology of China Hefei Anhui Province China

ISBN: (纸本)0889864640

The high power consumption of a processor is becoming a critical problem for both battery-powered devices and highperformance computers. Any reductions in the operating frequency of the processor and its supply voltage can lead to significant savings in energy consumption (and heat dissipation) but cause longer execution times. In this paper, the problem of performance-lossless software energy reduction for variable-voltage processors is introduced based on the analysis of voltage scaling characteristic. We discuss compile-time energy reduction techniques which identifies voltage scaling opportunities to achieve energy savings without performance loss. The problem is formulated in terms of mixed integer linear programming formulation, which can sufficiently exploit the difference of voltage scaling characteristics of subtasks. The model can be built by using program profiling results or some necessary parameters, and the heuristic algorithm is presented. Experiment results demonstrate the effectiveness of our strategy by using known benchmark programs on a dedicated processor simulator. Finally the performance of the heuristic algorithm is studied and the impact of the transition overheads is analyzed as well.

关键词： Voltage scaling

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A new pointer-based instruction queue design and its power-performance evaluation

A new pointer-based instruction queue design and its power-p...

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International Conference on computer Design

作者： Ramírez, MA Cristal, A Veidenbaum, AV Villa, L Valero, M Computer Architecture Department U.P.C. Spain Dep. of Computer Science University of California Irvine United States Mexican Petroleum Institute Mexico National Polytechnic Institute Mexico

ISBN: (纸本)0769524516

Instruction queues consume a significant amount of power in a high-performance processor. The wakeup logic delay is also a critical timing parameter. This paper compares a commonly used CAM-based instruction queue organization with a new pointer-based design for delay and energy efficiency. A design and pre-layout of all critical structures in 70nm technology is performed for both organizations. The pointer-based design is shown to use 10 to 15 times less power than the CAM-based design, dep.nding on queue size, for a 4-wide issue, 5GHz processor. The results also demonstrate the importance of evaluating all steps of instruction queue access: allocation, issue and wakeup rather than wakeup alone, especially for power consumption.

关键词： instruction wakeup issue queue Out-of-Order Processors CAM low power

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Optimal synchronizing sequences for machines with timing constraints

Optimal synchronizing sequences for machines with timing con...

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2005 International Conference on Embedded Systems and Applications, ESA'05

作者： Stulman, Ariel Bloch, Simon Mendelbaum, H.G. University of Reims Reims France Dep. of Computer Science Jerusalem College of Technology Jerusalem 91160 Israel

ISBN: (纸本)9781932415537

The new field of testing of timed-IUT (Implementation Under Test with time constraints) is rapidly evolving, with new and extended test generation methods using timed automata. Most methods, however, key their algorithms towards transformation of a timed-IUT into a regular, un-timed IUT;thus, avoiding the need of redefining well known test generation algorithms. In this paper we wish to demonstrate that as far as the well known synchronizing sequence problem, it is preferable to adapt the standard algorithm to meet the special needs of a timed-IUT, sidestepping a costly transformation. We propose a new method of generating a timed- synchronizing sequence, which allows direct testing of a timed-IUT. An example is used to show the relevance of this method.

关键词： Timing circuits

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A sharable test content development and analysis mechanism based on scorm 11

A sharable test content development and analysis mechanism b...

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11th International Conference on Distributed Multimedia Systems, DMS 2005

作者： Hung, Lun-Ping Yang, Hsuan-Che Chang, Wen-Chih Chiang, Hui-Fen Dep. Of Information Management Northern Taiwan Institute of Science and Technology Taiwan Dep. of Computer Science and Information Engineering Tamkang University Taiwan R.O.C Taiwan

ISBN: (纸本)1891706179

In the environment of distance learning, most of current systems available are unable to share the experience of developing material content and can not provide subsequent learning result analysis. In order to overcome these shortcomings, we developed a sharable test content development and analysis mechanism (STCDAM) based on SCORM (Shareable Content Object Reference Model) and item response theory (IRT). Our purpose is to construct an integrated distance learning systematic assessment mechanism in which test content is shareable and the quality of a test can be improved. STCDAM incorporates advanced multimedia tools for content builder to construct test content easily based on the requirement of SCORM and evaluates online learners’ overall learning performance for teachers to adjust the test content to better reflect students’ learning ability. © 2005 by Knowledge Systems Institute Graduate School.

关键词： Distance education

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A virtual real-time model for control software development - Applied on a sheet-metal press line

A virtual real-time model for control software development -...

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2005 3rd International Industrial Simulation Conference, ISC 2005

作者： Svensson, Bo Danielsson, Fredrik Lennartson, Bengt Dep. of Technology Mathematics and Computer Science University of Trollhattan Uddcvalla P.O. Box 957 SE-461 29 Trollhattan Sweden Dep. of Signals and Systems Chalmers University of Technology SE-412 96 Goteborg Sweden

ISBN: (纸本)907738118X

Maximizing lifetime throughput, i.e. increasing the total number of produced components in a pre-existing production line, is a continuous and never-ending process in industry. In order to attain a high lifetime throughput, it is important not only to have a high throughput rate during production but also to minimize production stops, both in number and time. In this paper a general Virtual Real-Time Model (VRTM) for simulating industrial production lines is proposed. The VRTM is intended to be used for off-line control software development and is aimed at maximizing lifetime throughput in highly automated production lines. The main features of the VRTM arc that the same control software is used as in the real production line and that virtual real-time is used, implying that everything is time-synchronised and works in the same way as in the real production line. An applied VRTM simulating a sheet-metal press line is also presented together with a comparison test with the no. 53 press line at Volvo Car Manufacturing in Goteborg, Sweden, in which a satisfactory agreement was obtained. The control software from the real production line that was used includes not only the pure production control, but also all security functions. This shows that the VRTM covers all control functions in the real production line and can be used for off-line control software development. © 2005 EUROSIS-ETI.

关键词： Throughput

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Dynamic secure aspect modeling with UML: From models to code 05

引用

8th International Conference on Model Driven Engineering Languages and Systems, MoDELS 2005

作者： Jürjens, Jan Houmb, Siv Hilde Software and Systems Engineering Dep. of Informatics TU Munich Germany Department of Computer and Information Science Norwegian University of Science and Technology Norway

ISBN: (纸本)3540290109

Security engineering deals with modeling, analysis, and implementation of complex security mechanisms. The dynamic nature of such mechanisms makes it difficult to anticipate undesirable emergent behavior. In this work, we propose an approach to develop and analyze security-critical specifications and implementations using aspect-oriented modeling. Since we focus on the dynamic views of a system, our work is complementary to existing approaches to security aspects mostly concerned with static views. Our approach includes a link to implementations in so far as the code which is constructed from the models can be analyzed automatically for satisfaction of the security requirements stated in the UML diagrams. We present tool support for our approach. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Security of data

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Design and implementation of the remote control lab using PDA

Design and implementation of the remote control lab using PD...

引用

IEEE International Workshop on Wireless and Mobile Technologies in Education, WMTE 2005

作者： Wu, Ping-Huang Kuo, Chin-Hwa Lin, Ching-Chung Department of Electrical Engineering Tung Nan Institute of Technology Taiwan Dep. of Computer Science and Information Engineering Tamkamg University Tamshui Taiwan

ISBN: (纸本)0769523854

The purpose of this paper is to design and implement the remote control lab using PDA (Personal Digital Assistant). This system integrates different fields of technology. They are Internet control, mobile control, and e-learning. We expend the e-learning to m-learning (mobile-learning). The wired control will become wireless control. Thus, the teaching will not be limited by time and location, and teaching resources and equipments can be integrated and shared, so the safety events can be monitored and handled in time. We provide an environment to train students to handle factory automation, data acquisition, data management, and manufacturing process using mobile devices. In addition, we also emphasize the integration and sharing of teaching equipments via internet and provide an environment which promotes learning interests and efficiency by using mobile devices via Internet. © 2005 IEEE.

关键词： Personal digital assistants

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An interactive ray-tracing based simulation environment for generating integral imaging video sequences

An interactive ray-tracing based simulation environment for ...

引用

Three-Dimensional TV, Video, and Display IV

作者： Olsson, Roger Xu, Youzhi Dep. of Information Technology and Media Mid Sweden Univ. SE-853 70 Sundsvall Sweden Dep. of Electrical and Computer Engineering Jönköping Univ. SE-551 11 Jönköping Sweden

The next evolutionary step in enhancing video communication fidelity over wired and wireless networks is taken by adding scene dep.h. Three-dimensional video using integral imaging (II) based capture and display subsystems has shown promising results and is now in the early prototype stage. We have created a ray-tracing based interactive simulation environment to generate II video sequences as a way to assist in the development, evaluation and quick adoption of these new emerging techniques into the whole communication chain. A generic II description model is also proposed as the base for the simulation environment. This description model facilitate optically accurate II rendering using MegaPOV, a customized version of the open-source ray tracing package POV-Ray. By using MegaPOV as a rendering engine the simulation environment fully incorporate the scene description language of POV-Ray to exactly define a virtual scene. Generation and comparability of II video sequences adhering to different II-techniques is thereby greatly assisted, compared to experimental research. The initial development of the simulation environment is focused on generating and visualizing II source material adhering to the optical properties of different II-techniques published in the literature. Both temporally static as well as dynamic systems are considered. The simulation environment's potential for easy dep.oyment of integral imaging video sequences adhering to different II-techniques is demonstrated.

关键词： Imaging systems

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