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5th IASTED International Conference on Visualization, Imaging, and Image Processing, VIIP 2005

作者： Ko, Chien-Chuan Lin, Chin-Shu Huang, Jia-Pei Hsu, Roy-Chao Ming Dep. of Computer Science and Information Engineering National ChiaYi Universiy University Road 300 ChiaYi Taiwan Dep. of Forest Resource National ChiaYi University University Road 300 ChiaYi Taiwan

ISBN: (纸本)0889865280

Efficient forest management requires resource information at fine scale. Satellite sensed imagery is one of potential tools for collecting forest resource. In this paper, we developed an automated delineation of tree crown based on a series of image processing procedures and spectral angle using multi-spectral information. Above all, the proposed schemes can be applied to an open forest with complicated scenes. Experimental results reveal that the proposed methods can effectively identify and isolate the tree crown compared to traditional approach, and manual delineation. It also provides detailed forest resource information, and can be used as a reliable management tool for forest resources.

关键词： Forestry

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Two-level cache for distributed system in RAID 5 disk controller

Two-level cache for distributed system in RAID 5 disk contro...

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18th International Conference on systems engineering, ICSEng 2005

作者： Jungho, Huh Dep. of Computer Science 228 Engineering Building West Univ. of Missouri-Columbia Columbia MO 65211 United States

ISBN: (纸本)0769523595

We proposed a two-level disk cache model that to achieve higher hit ratios and relieve 'small write problem'in RAID 5 disk controller. And to enhance reliability of disk cache using non-volatile memory device for stable data. Especially this model improved utilization of first level cache. The proposed cache system consists of two-level caches with different associativities and different block sizes. The first level cache is a set-mapped cache with small block size that uses a set-associative mapping scheme. A set-mapped cache is reduces conflict miss ratios as compared with conventional direct-mapped cache. And the second level cache is a fully-mapped cache with large block size that uses a fully-associative mapping scheme. The large block sizes as a multiple of small blocks. The aim is to show, in terms of hit ratio and service time, that the two-level cache structure presented in this paper is in fact much improved. © 2005 IEEE.

关键词： Buffer storage

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Design and performance evaluation of an adaptive parity cache technique

Design and performance evaluation of an adaptive parity cach...

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18th International Conference on systems engineering, ICSEng 2005

作者： Jungho, Huh Dep. of Computer Science 228 Engineering Building West Univ. of Missouri-Columbia Columbia MO 65211 United States

ISBN: (纸本)0769523595

This research proposes adaptive parity cache technique on cache to solve "small write problem" of RAID 5 especially in OLTP environments. This configuration provides a cache management method that adds information on the read/write characteristics of the file when a user process in RAID 5 makes a request to kernel for a file. This information is used for management of disk cache by reading the parity. Especially on write request, this method reduces additional access problems compared to conventional methods by using write related information of the file system to store data and parity together in a cache. Therefore, we can enhance the cache utilization and improve the disk request response time. Our method is analyzed mathematical method. Comparing with previous works, we observed performance enhancement. © 2005 IEEE.

关键词： Cache memory

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Efficient processing power utilization to execute real-time tasks

Efficient processing power utilization to execute real-time ...

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5th IEEE International Symposium on Signal Processing and Information Technology

作者： Hussein, Ahmed Ammar, Reda Hamdy, Abeer Dept. of Computer Science and Engr. University of Connecticut Storrs CT 06269-3155 United States Dep. of Computer Systems Electronic Research Institute Giza Egypt

Scheduling real-time applications requires high utilization of the available processing power on processors to accommodate as many tasks as possible while satisfying the required deadlines of the applications. Moreover, an acceptable level of reliability should be provided due to the critical nature of the applications. In this paper we propose a new approach that highly utilizes the available processing power to improve the admission rate of real-time task scheduling. The basic idea is to use all of the available processing power to execute allocated tasks. This reduces the execution time needed for each task and hence increases its reliability. It also reduces needed processing power for existing tasks to satisfy their deadlines and hence provides higher available processing power for any new task. This gives a higher chance for the new arriving task to be accommodated. We show that our approach is beneficial in that it provides a better scheme with higher acceptance rate for real time tasks compared to the traditional approach of using a fixed processing power reservation. © 2005 IEEE.

关键词： Real time systems

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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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Performance by Unified Model Analysis (PUMA)

Performance by Unified Model Analysis (PUMA)

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5th International Workshop on Software and Performance, WOSP'05

作者： Woodside, Murray Petriu, Dorina C. Petriu, Dorin B. Shen, Hui Israr, Toqeer Merseguer, Jose Dept. of Systems and Computer Engineering Carleton University Ottawa Canada Dep. de Informatica e Ingenieria de Sistemas Universidad de Zaragoza Zaragoza Spain

ISBN: (纸本)1595930876

Evaluation of non-functional properties of a design (such as performance, dep.ndability, security, etc.) can be enabled by design annotations specific to the property to be evaluated. Performance properties, for instance, can be annotated on UML designs by using the "UML Profile for Schedulability, Performance and Time (SPT)". However the communication between the design description in UML and the tools used for non-functional properties evaluation requires support, particularly for performance where there are many alternative performance analysis tools that might be applied. This paper describes a tool architecture called PUMA, which provides a unified interface between different kinds of design information and different kinds of performance models, for example Markov models, stochastic Petri nets and process algebras, queues and layered queues. The paper concentrates on the creation of performance models. The unified interface of PUMA is centered on an intermediate model called Core Scenario Model (CSM), which is extracted from the annotated design model. Experience shows that CSM is also necessary for cleaning and auditing the design information, and providing default interpretations in case it is incomplete, before creating a performance model. Copyright 2005 ACM.

关键词： computer architecture

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Tumor segmentation and visualization of femur using MRI

Tumor segmentation and visualization of femur using MRI

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5th IASTED International Conference on Visualization, Imaging, and Image Processing, VIIP 2005

作者： Ko, Chien-Chuan Yang, Li-Yu Lin, Chi-Jen Dep. of Computer Science and Information Engineering National ChiaYi University University Road 300 ChiaYi Taiwan Dept. of Orthopaedics National ChengKung University Hospital University Road 300 ChiaYi Taiwan

ISBN: (纸本)0889865280

Segmentation and visualization of femur and tumor on the femur are important tasks for surgeon in operation planning and disease treatment. Because MR slices can provide rich information about the disease, it is often used as a planning tool for diagnosis or surgeon operation. In this study, a series of segmentation techniques such as thresholding, mathematical morphology, and active contour model were proposed to detect tumors of femur, and extract its geometric shape. Then, an interpolation scheme based on morphological morphing was performed on the original slices to produce accurate and smooth intermediate slices and volumetric data between neighboring slices. Finally, the tumor on the femur was visualized using surface rendering based on Marching Cubes and Phong shading model under an interactive environment. Besides transparent volume rendering based on ray-casting was used to delineate the relative structure between the detected femur and the detected tumor. The proposed system provides various qualitative information including tumor location and shape for rthopedist for their treatment strategies.

关键词： Tumors

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Short-delay video streaming with restricted supplying peer bandwidth

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) 2005年 3754卷 362-370页

作者： Yang, Hung-Chang Yu, Hsiang-Fu Tseng, Li-Ming Chen, Yi-Ming Dep. of Computer Science & Information Engineering National Central University Jung-Li Taiwan Dep. of Information Management National Central University Jung-Li Taiwan

ISBN: (纸本)3540296417

With the growth of bandwidth, real-time video streaming service becomes popular. Such application is also considered a future killer application on Internet. Recent research efforts have demonstrated the promising potential of building cost-effective video streaming systems on top of peer-to-peer (P2P) networks. Since the peers have limited capacity, such as upstream bandwidth, each streaming session may involve multiple supplying peers. In this paper, we propose a novel strategy to retrieve a long-duration video from multiple peers which have arbitrary and restricted upstream bandwidth, such that the waiting time is minimized. In comparison with the previous work [13], our strategy can greatly improve the waiting time. In the arbitrary given examples, our strategy can improve the waiting time by 67%. To take into account the popular compressed video with variable bit rate, we also show how to apply our strategy readily to the VBR videos. © IFIP International Federation for Information Processing 2005.

关键词： Bandwidth

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Compact genetic algorithm for performance improvement in hierarchical sensor networks management

Compact genetic algorithm for performance improvement in hie...

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8th International Symposium on Parallel Architectures, Algorithms and Networks, I-SPAN 2005

作者： Jin, Ming-Hui Liu, Win-Zing Hsu, D. Frank Kao, Cheng-Yan Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan Tong An Element School Taoyuan Taiwan Dep. of Computer and Information Sciences Fordham University LL813 New York NY 10023 United States Institute of Information Industry Taipei Taiwan

ISBN: (纸本)0769525091

This paper introduces a novel scheduling problem called the active interval scheduling problem in hierarchical wireless sensor networks for long-term periodical monitoring applications. To improve the report sensitivity of the hierarchical wireless sensor networks, an efficient scheduling algorithm is desired. Therefore, in this paper, we propose a compact genetic algorithm (CGA) to optimize the solution quality for sensor network maintenance. The experimental result shows that the proposed CGA brings better solutions in acceptable calculation time. © 2005 IEEE.

关键词： Genetic algorithms

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A layered architecture for supporting optical burst switching

A layered architecture for supporting optical burst switchin...

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Advanced International Conference on Telecommunications (AICT)

作者： F. Farahmand J. Jue V. Vokkarane J.J.P.C. Rodrigues Dep of Elect. Engineering Dep. of Computer Science University of Texas at Dallas Richardson Tx CIS University of Massachusetts at Dartmouth Massachusetts Department of Informatics University of Beira Interior Covilhã Portugal

The paper defines a new layered architecture for supporting optical burst switching in an optical core network. The architecture takes into account both the control plane and the data plane. The paper describes the functionality and the primary protocols that are required at each layer. The paper also explains how the layers interact with each other in the proposed architecture.

关键词： Optical burst switching Optical packet switching Telecommunication traffic Optical fiber networks Optical buffering Optical network units Wavelength division multiplexing Bandwidth Switching circuits Resource management

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