Browsing by Author "Yang, CY"

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A collaborated computing system for load sharing with P2P environments: a study for the algorithm analysis in the digital watermark filter evaluation
(2005)
Tsai, MJ
;
Yang, CY
;
資訊管理與財務金融系註：原資管所+財金所
;
Department of Information Management and Finance
Peer-to-Peer (P2P) communication has attracted peoples' attention due to the resource sharing capabilities, such as the exchanging of information and content files and sharing processing cycles, cache space, and disk storage. Therefore, the traditional client/server architecture has been gradually replaced by P2P structure. The collaborated computing system for load sharing takes the advantages of P2P system. In this paper, the collaborated computing system was utilized based on the case of analyzing the robustness of digital watermark by filter bank selection. As the result of this case, the performance can be improved in the aspect of speedup, efficiency and process time.
A low-voltage low-distortion MOS sampling switch
(2005)
Yang, CY
;
Hung, CC
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電信工程研究所
;
Institute of Communications Engineering
In order to reduce distortion due to variation of the gate overdrive and the threshold voltage, a novel low-voltage constant-resistance sampling switch is proposed in this paper. The technique to reduce nonlinearity can be used in a high resolution sample and hold circuit. TSMC 0.18um standard CMOS technology is utilized in this research. Results indicate that much lower Total Harmonic Distortion (THD) is achieved by the proposed circuit. The low THD meets the requirements in the application of the low-voltage low-distortion switched-capacitor circuits.
A reliable low-voltage low-distortion MOS analog switch
(2006-02-01)
Yang, CY
;
Hung, CC
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電信工程研究所
;
Institute of Communications Engineering
A novel low-voltage low-distortion analog sampling switch is proposed in this letter. A "source tracker" techniuqe is used to distinguish the real source terminal of the sampling switch. The turn-on resistance of the sampling switch is kept exactly constant. The modified switch makes the rail-to-rail input signal swing possible for low voltage. TSMC 0.18 mu m standard CMOS technology is utilized in this research. Results indicate that much lower Total Harmonic Distortion (THD) is achieved by the proposed circuit. The low THD meets the requirements in the application of the low-voltage low-distortion switched-capacitor circuits.
EBTC: An economical method for searching the threshold of ETC compression
(1996-09-26)
Yang, CY
;
Lin, JC
;
資訊工程學系
;
Department of Computer Science
An economical method for obtaining a nearly-optimal threshold for the block truncation coding (BTC) image compression algorithm is presented. Simulation results show that the PSNR performance of the proposed economic BTC (EBTC) method is very close to that of the optimised BTC (OBTC) algorithm, but EBTC only takes about half the computation time required by the OBTC algorithm.
EBTC: An economical method for searching the threshold of ETC compression
(1996-09-26)
Yang, CY
;
Lin, JC
;
交大名義發表
;
資訊工程學系
;
National Chiao Tung University
An economical method for obtaining a nearly-optimal threshold for the block truncation coding (BTC) image compression algorithm is presented. Simulation results show that the PSNR performance of the proposed economic BTC (EBTC) method is very close to that of the optimised BTC (OBTC) algorithm, but EBTC only takes about half the computation time required by the OBTC algorithm.
Enhanced performance of poly-Si thin film transistors using fluorine ions implantation
(2005)
Tu, CH
;
Chang, TC
;
Liu, PT
;
Zan, HW
;
Tai, YH
Fluorine (F)-implanted polycrystalline silicon thin-film transistor (poly-Si TFT) are proposed for the enhancement of device performance. A significant improvement in electrical characteristics, such as I-ON/I-OFF ratio, and field effect mobility, can be realized in the new thin-film transistor. The field effect mobility for F-implanted poly-Si TFTs is 53.82 cm(2)/V-s, and higher than 19.74 cm(2)/V-s in conventional SPC poly-Si TFTs. Furthermore, the F-implanted poly- Si TFT exhibits high immunity against hot carrier effect and improved electrical reliability. The manufacturing processes are simple and without additional thermal annealing steps, thereby compatible with the conventional TFT fabrication processes. (c) 2005 The Electrochemical Society. All rights reserved.
Enriching user-oriented class associations for library classification schemes
(2003)
Pu, HT
;
Yang, CY
;
交大名義發表
;
National Chiao Tung University
This paper explores the possibility of adding user-oriented class associations to hierarchical library classification schemes. Some highly associated classes not grouped in the same subject hierarchies, yet relevant to users' knowledge, are automatically obtained by analyzing a two-year log of book circulation records from a university library in Taiwan. The library uses the Chinese Decimal Classification scheme, which has similar structure and notation to the Dewey Decimal Classification. Methods, from both collaborative filtering and information retrieval research, were employed and their performance compared based on similarity estimation of classes. The results show that classification schemes can, therefore, be made more adaptable to changes of users and the uses of different library collections by analyzing the circulation patterns of similar users. Limitations of the methods and implications for applications are also discussed.
Establishing a Web-based DICOM teaching file authoring tool using open-source public software
(2005-09-01)
Lee, WJ
;
Yang, CY
;
Liu, KL
;
Liu, HM
;
Ching, YT
Online teaching files are an important source of educational and referential materials in the radiology community. The commonly used Digital Imaging and Communications in Medicine (DICOM) file format of the radiology community is not natively supported by common Web browsers. The ability of the Web server to convert and parse DICOM is important when the DICOM-converting tools are not available. In this paper, we describe our approach to develop a Web-based teaching file authoring tool. Our server is built using Apache Web server running on FreeBSD operating system. The dynamic page content is produced by Hypertext Preprocessor (PHP). Digital Imaging and Communications in Medicine images are converted by ImageMagick into Joint Photographic Experts Group (JPEG) format. Digital Imaging and Communications in Medicine attributes are parsed by dicom3tools and stored in PostgreSQL database. Using free software available from the Internet, we build a Web service that allows radiologists to create their own online teaching file cases with a common Web browser.
Hybrid adaptive block truncation coding for image compression
(1997-04-01)
Yang, CY
;
Lin, JC
;
交大名義發表
;
資訊工程學系
;
National Chiao Tung University
A hybrid adaptive block truncation coding (HABTC) method is presented to improve block truncation coding (BTC)-related compression methods for gray-level images. The basic idea behind the method is to use various coding schemes to take advantage of local image characteristics. A simple linear interpolation coding scheme and a very basic predictive coding scheme are used to improve the compression ratio of the homogeneous area of the image. Moreover, a four-level ETC, whose thresholds are obtained using a radius-weighted mean (RWM), is applied to encode the inhomogeneous area. The bits per pixel/peak SNR (bpp/PSNR) values listed in many other BTC-related papers are cited and compared with ours. It is found that reasonable compression ratio is obtained by the proposed HABTC method and the visual quality of the decoded images is also acceptable. (C) 1997 Society of Photo-Optical Instrumentation Engineers.
Improvement of electrical characteristics for fluorine-ion-implanted poly-Si TFTs using ELC
(2006-04-01)
Tu, CH
;
Chang, TC
;
Liu, PT
;
Yang, CY
;
Liu, HC
The fluorine ion implantation applied to the polycrystalline silicon thin-film transistors (poly-Si TFTs) is investigated in this letter. Experimental results have shown that fluorine ion implantation effectively minimized the trap state density, leading to superior electrical characteristics such as high field-effect mobility, low threshold voltage, and high ON/OFF current ratio. Furthermore, the fluorine ions tended to segregate at the interface between the gate oxide and poly-Si layers during the excimer laser annealing, even without the extra deposition of pad oxide on the poly-Si film. The presence of fluorine obviously enhanced electrical reliability of poly-Si TFTs.
Insider ownership structure and firm performance: A productivity perspective study in Taiwan's electronics industry
(2005-03-01)
Sheu, HJ
;
Yang, CY
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管理科學系
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資訊管理與財務金融系註：原資管所+財金所
;
Department of Management Science
In the context of agency theory (Jensen and Meckling, 1976. Journal of Financial Economics, 3, 305-360), how insider stock ownership relates to firm performance is explored in this paper. The relevant performance measure used is total factor productivity. Insiders are classified into executives, board members and blockholders so as to facilitate a detailed study. Five-year (1996-2000) panel data of 333 Taiwanese listed electronics firms are examined. It is observed that total insider ownership remains steady while the executive-to-insider holding ratio increases significantly. In terms of the effect on total factor productivity, neither the total insider ownership nor the board-to-insider holding ratio shows any influence on productivity. However, productivity first decreases then increases with the executive-to-insider holding ratio, forming a U-shaped relationship. The results indicate that stock ownership of top officers in high-tech firms should be encouraged to enhance productivity.
Modeling and optimization of a plastic thermoforming process
(2004)
Yang, CY
;
Hung, SW
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經營管理研究所
;
Institute of Business and Management
Thermoforming of plastic sheets has become an important process in industry because of their low cost and good formability. However there are some unsolved problems that confound the overall success of this technique. Nonuniform thickness distribution caused by inappropriate processing condition is one of them. In this study, results of experimentation were used to develop a process model for thermoforming process via a supervised learning back propagation neural network. An "inverse" neural network model was proposed to predict the optimum processing conditions. The network inputs included the thickness distribution at different positions of molded parts. The output of the processing parameters was obtained by neural computing. Good agreement was reached between the computed result by neural network and the experimental data. Optimum processing parameters can thus be obtained by using the neural network scheme we proposed. This provides significant advantages in terms of improved product quality.
Potential-based modeling of 2-D regions using nonuniform source distributions
(2000-03-01)
Chuang, JH
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Tsai, CH
;
Tsai, WH
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Yang, CY
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資訊工程學系
One of existing approaches to path planning problems uses a potential function to represent the topological structure of the free space. Newtonian potential was used in [1] to represent object and obstacles in the two-dimensional (2-D) workspace wherein their boundaries are assumed to be uniformly charged. In this paper, more general, nonuniform distributions are considered. It is shown that for linear or quadratic source distributions, the repulsion between two polygonal objects ran be evaluated analytically. Simulation results show that by properly adjusting the charge distribution along obstacle/object boundaries, path planning results can be improved in terms of collision avoidance, path length, etc.
Research into two source-based control algorithms for Internet traffic flows
(2001-10-01)
Yang, CY
;
Fu, CH
;
資訊管理與財務金融系註：原資管所+財金所
;
Department of Information Management and Finance
TCP and UDP are the major applications over the Internet, the characteristics of them lead to different network transmission behaviors. Two source-based mechanisms are proposed in this paper to regulate TCP and UDP flows. One is the-congestion control mechanism, which uses TCP flows' congestion signal to regulate the flows at the source node. The other is the time slot mechanism, which is a time-sharing application to control their flow transmission, Based on the priorities of flows, different bandwidth proportions are allocated and differential services are provided for flows. Several scenarios are simulated to observe the transmission operations of these two mechanisms. Simulation results show some insights into two mechanisms. Moreover, the several simulation parameters that may impact the performance of these two mechanisms are summarized. (C) 2001 Elsevier Science B,V, All rights reserved.
RWM-cut for color image quantization
(1996-07-01)
Yang, CY
;
Lin, JC
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資訊工程學系
;
Department of Computer Science
A new simple method for constructing a color palette that uses the radius weighted mean cut (RWM-cut) is proposed. The method is a hierarchically divisive method, and each two-class partition uses the centroid and the RWM only. Experiments show that the RWM-cut algorithm is feasible and visually acceptable. The algorithm can either be used alone or be used to create a good initial palette for the LBG algorithm. Besides the 3-D version, a 1-D version of the RWM-cut algorithm is also included in the paper for realtime color quantization. The quantization error is small and the processing speed is competitive. Dithered images are also provided. Copyright (C) 1996 Elsevier Science Ltd
SDM: A light-weight end-to-end measuring approach for resilient multihoming network
(2005)
Yang, CY
;
Peng, T
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資訊管理與財務金融系註：原資管所+財金所
;
Department of Information Management and Finance
End-to-end measurement is applied in a multihoming network to find the optimum path for a particular destination. More measurements leads to more accurate network evaluations and fewer transmissions to failed links, but occupies more multihoming equipment resources by using extra packets for end-to-end measurement, causing heavier network traffic. Therefore, a trade-off exists between timely measurement and resource usage. This study proposes a per-connection timely end-to-end measurement approach, called Self-Detected Measurement (SDM), which consumes few resources, and demonstrates it to be effective in keeping away from outage path in an emulation environment.
Taiwan's dilemma across the strait - Lifting the ban on semiconductor investment in China
(2003-07-01)
Yang, CY
;
Hung, SW
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經營管理研究所
;
Institute of Business and Management
For more than two decades, Taiwanese semiconductor manufacturers have been banned from investing in China. There was a heated debate in 2001-02 for several months over whether to lift the ban. The purpose of this study is to report the dilemma that the Taiwanese government faced during the debate, and the decision-making process of allowing Taiwanese integrated circuit foundries to invest in China.
The R&D and marketing cooperation stages: An empirical study across new product development of Taiwan's IT industry
(2004-10-01)
Lu, LYY
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Yang, CY
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經營管理研究所
;
Institute of Business and Management
This study extends the new product development (NPD) process research to a new environmental context (Taiwan's IT industry) and a new business type (original design manufacturing, ODM). Taiwan's IT industry has achieved a very outstanding performance during the last two decades. The island's experience is quite valuable for those emerging countries that are struggling to transform themselves from producing low-value goods to making high-technology products. After analyzing the data collected from 153 research and development (R&D) and marketing managers in Taiwanese IT firms, this study finds that the higher the perceived importance of R&D-marketing cooperation is, the higher the attained level of R&D-marketing cooperation will be. Consequently, a better NPD performance can be achieved. This study additionally reports that a firm that has adopted a Defender innovation strategy attains a lower level of R&D-marketing cooperation, and has a poorer NPD performance than those firms that adopted either Prospector or Analyzer innovation strategies. Finally, environmental uncertainty has no significant impacts on the perceived importance and the attained level of R&D-marketing cooperation. (C) 2003 Elsevier Inc. All rights reserved.
Toward Web Services
(2001)
Chiu, HS
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Yang, CY
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工業工程與管理學系
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Department of Industrial Engineering and Management
This article is to descript a successful experience on a 30 man-month software project of Advanced eCommerce Technology Lab., Institute for Information Industry in Taiwan. In this research, attention is strictly focused on the interrelationships among key components that link between business processes, information applications, and information technology infrastructure, The sen,ice-oriented project presents a Web Services model for building new cra applications. It discusses the definition of Web Services, the generic architecture of a Web Services, and how our solution relates to Microsoft Windows DNA and .NET.