Browsing by Issue Date, starting with "2009-03-31"

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Dual bandpass filter having serial configuration of coupled-line filters
(2009-03-31)
Chung
;
Shyh-Jong
;
Lin
;
Ke-Chiang
;
Chang
Two second-order bandpass filter are connected serially to obtain a dual bandpass filter. One is inductive and the other is capacitive. One has a low passband and the other has a high passband. Between them, a finite transmission zero is formed to suppress noise. The present invention achieves a passband as wide as 1 gigahertz so that it can be applied to a wireless local network, communication equipments and electronic devices.
管理決策概念架構之回顧與建議
(2009-04-01)
毛治國
;
鄭琇君
;
Chi-Kuo Mao
;
Hsiu-Chun Cheng
;
Institute of Business and Management
本文以發展一套決策的概念架構爲目的，期望此一架構能爲管理決策的研究與教學定義其宏觀的範疇。本文以Simon (1960, 1977)的IDC三段論決策模型作爲討論的基礎。首先針對決策研究代表性的兩份國際期刊近50年的114篇論文作爲樣本，說明當前決策研究的重點有過於偏向Choice單一議題的傾向；其次再從有關的代表性期刊中篩選17篇以決策程序爲主題的論文，印證IDC模型雖然仍是一具有包容性的概念架構；但爲避免應用與解讀上的分歧，IDC的具體內涵有必要予以進一步定義。因此，本文提出「見識謀斷」四段論的概念架構模型，先將IDC模型中的Intelligence展開成Intelligence與Conception兩個段落，使它成爲ICDC（見識謀斷）四段論模型，然後再將四階段分別展開，發展出一個由四階段八步驟所構成的決策範疇與概念架構。本文並進一步探討這一「見識謀斷」決策概念架構與管理實務的相關性以及它在管理理論的實然面與應然面的意義。
Design and Performance Analysis of Micro Proton Exchange Membrane Fuel Cells
(2009-04-01)
Zhong Zhenzhong
;
Chen Junxun
;
Peng Ronggui
;
機械工程學系
;
Department of Mechanical Engineering
This study describes a novel micro proton exchange membrane fuel cell (PEMFC) (active area, 2.5 cm(2)). The flow field plate is manufactured by applying micro-electromechanical systems (MEMS) technology to silicon Substrates to etch flow channels without a gold-coating. Therefore, this investigation used MEMS technology for fabrication of a flow field plate and presents a novel fabrication procedure. Various operating parameters, such as fuel temperature and fuel stoichiometric flow rate, are tested to optimize micro PEMFC performance. A single micro PEMFC using MEMS technology reveals the ideal performance of the proposed fuel cell. The optimal power density approaches 232.75 mW.cm(-1) when the fuel cell is operated at ambient condition with humidified, heated fuel.
Pressure-induced structural distortion of TbMnO3: A combined x-ray diffraction and x-ray absorption spectroscopy study
(2009-04-01)
Chen, J. M.
;
Chou, T. L.
;
Lee, J. M.
;
Chen, S. A.
;
Chan, T. S.
The variation of electronic states and structural distortion in highly compressed multiferroic TbMnO3 was probed by x-ray diffraction (XRD) and x-ray absorption spectroscopy (XAS) using synchrotron radiation. Refined XRD data enabled observation of a reduced local Jahn-Teller (JT) distortion of Mn sites within MnO6 octahedra in TbMnO3 with increasing hydrostatic pressure. A progressively increasing intensity of the white line in Mn K-edge x-ray absorption spectra of TbMnO3 was detected with increasing pressure. The absorption threshold of Mn K-edge spectra of TbMnO3 is shifted toward higher energy, whereas the pre-edge peak is slightly shifted to lower energy with increasing hydrostatic pressure. We provide spectral evidence for pressure-induced bandwidth broadening for mangnites. The enhanced intensity of the white line and the shifted absorption threshold of Mn K-edge spectra are explained in terms of a reduced JT distortion of MnO6 octahedra in compressed TbMnO3. Comparison of XAS data with full-multiple-scattering calculations using code FDMNES shows satisfactory agreement between experimental and calculated Mn K-edge spectra.
Pulse-IV Characterization of Charge-Transient Behavior of SONOS-Type Devices With or Without a Thin Tunnel Oxide
(2009-04-01)
Du, Pei-Ying
;
Lue, Hang-Ting
;
Wang, Szu-Yu
;
Huang, Tiaci-Yuan
;
Hsieh, Kuang-Yeu
The transient behavior of SONOS-type devices was investigated for the first time using pulse-IV technique. Three kinds of SONOS devices are studied: SONS (without top oxide), SONoS (with a thin top oxide), and SoNOS (with a thin bottom oxide). Devices with or without a thin tunnel oxide were able to provide very fast charge injection/detrapping, but their charge-transient behavior cannot be accurately monitored by conventional DC-IV method. By using specific pulse-IV setup for memory, we can measure the drain current response immediately after programming and erasing, as well as the fast charge relaxation under various reliability tests. The program and erase transient behavior shows that all devices are easily programmed and erased within 1 mu s at low gate voltages (< 6 V). Moreover, SONS shows the fastest program and erase speeds because of the absence of tunnel oxide, and silicon nitride has very low barrier height that offers fast injection. We have also examined the charge relaxation under various field and temperature conditions and found that the charge loss mainly came from external charge injection during retention, not from detrapping through thermionic emission.
Capture of CO2 from flue gas via multiwalled carbon nanotubes
(2009-04-01)
Su, Fengsheng
;
Lu, Chungsying
;
Cnen, Wenfa
;
Bai, Hsunling
;
Hwang, Jyh Feng
Carbon nanotubes (CNTs) were modified by 3-aminopropyl-triethoxysilane (APTS) solution and were tested for its CO2 adsorption potential at multiple temperatures (20-100 degrees C). The physicochemical properties of CNTs were changed after the modification, which makes CNTs adsorb more CO2 gases. The adsorption capacities Of CO2 via CNTs and CNTs(APTS) decreased with temperature indicating the exothermic nature of adsorption process and increased with water content in air at 0-7%. The mechanism of CO2 adsorption on CNTs and CNTs(APTS) appears mainly attributable to physical force regardless of temperature change, which makes regeneration of spent CNTs at a relatively low temperature become feasible. The CNTs(APTS) have good adsorption performance Of CO2 at 20 degrees C as compared to many types of modified carbon or silica adsorbents documented in the literature. This suggests that the CNTs(APTS) are promising low-temperature adsorbents for CO2 capture from flue gas. (C) 2009 Elsevier B.V. All rights reserved.
我國電力自由化市場交易機制與配套措施研究
(2009-04-01)
彭金堂
;
林國勝
;
Jin-Tang Peng
;
Kuo-Sheng Lin
;
Institute of Business and Management
電力產業具有規模報酬遞增的特性，電力供給一般都以獨占的公用事業型態存在，但是隨著產業結構的轉變與電力科技的進步，使得電力產業的開放與自由化成爲世界各國電業發展的趨勢。目前，全球已有很多國家實施電力自由化，台灣也正在研擬電業法修正法案，逐步開放民營發電業、推行台電的民營化與電業的自由化。其中，建立電力市場交易機制與配套措施成爲重要的課題。本研究是接受台電公司委託研究成果之一，主要目的爲分析探討各國電力市場的競爭機制，利用決策分析系統化的分析方法，從定義問題分析各種方案，藉由優劣分析客觀描述各方案的預期結果與可能狀態，與配合分析台灣電力市場的環境因素，最後綜合判斷台灣在電力交易與電力運作方面適合採行的方案，提出台灣電力市場交易機制與運作的關鍵成功因素，以提供政府相關單位修法以及擬定配套措施的決策依據。
A synthetical approach for blog recommendation: Combining trust, social relation, and semantic analysis
(2009-04-01)
Li, Yung-Ming
;
Chen, Ching-Wen
;
資訊管理與財務金融系註：原資管所+財金所
;
Department of Information Management and Finance
Weblog is a good paradigm of online social network which constitutes web-based regularly updated journals with reverse chronological sequences of dated entries, usually with blogrolls on the sidebars, allowing bloggers link to favorite site which they are frequently visited. In this study we propose a blog recommendation mechanism that combines trust model, social relation and semantic analysis and illustrates how it can be applied to a prestigious online blogging system - wretch in Taiwan. By the results of experimental study, we found a number of implications from the Weblog network and several important theories in domain of social networking were empirically justified. The experimental evaluation reveals that the proposed recommendation mechanism is quite feasible and promising. (C) 2008 Elsevier Ltd. All rights reserved.
具有電源轉換與雙向通訊之裝置及其方法
(2009-04-01)
張隆國
;
楊如璇
一種具有電源轉換與雙向通訊之裝置,包括變壓器、橋式開關電路、整流電路與阻抗調變電路。變壓器用以傳遞初級與次級線圈之能量,並提供隔離機制,且變壓器與電容形成共振電路。橋式開關電路耦接於初級線圈,根據順向資料產生第一調變訊號。整流電路耦接於次級線圈,用以產生供應電壓。阻抗調變電路耦接於次級線圈,根據逆向資料改變變壓器的阻抗,進而調變共振電路上的共振訊號以產生第二調變訊號。
Radio-Frequency Small-Signal and Noise Modeling for Silicon-on-Insulator Dynamic Threshold Voltage Metal-Oxide-Semiconductor Field-Effect Transistors
(2009-04-01)
Wang, Sheng-Chun
;
Su, Pin
;
Chen, Kun-Ming
;
Huang, Sheng-Yi
;
Hung, Cheng-Chou
This paper presents small-signal and noise modeling for radio-frequency (RF) silicon-on-insulator (SOI) dynamic threshold voltage (DT) metal-oxide-semiconductor field-effect transistors (MOSFETs). The inherent body parasitics, such as source- and drain-side junction capacitances, and access body resistance have been incorporated in this model. In addition, the analytical equations useful for parameter extractions are derived. The modeling results show good agreements with the measured data both in RF small-signal and noise aspects up to 12 GHz. Besides, we have made comparisons of important model parameters for DT and standard MOSFETs. The extracted parameters show reasonable trend with respect to applying voltages and channel lengths, which reveals the accuracy of the extraction results using our proposed method. (C) 2009 The Japan Society of Applied Physics
A Fast Scalable Automaton-Matching Accelerator for Embedded Content Processors
(2009-04-01)
Tseng, Kuo-Kun
;
Lai, Yuan-Cheng
;
Lin, Ying-Dar
;
Lee, Tsern-Huei
;
資訊工程學系
Home and office network gateways often employ a cost-effective embedded network processor to handle their network services. Such network gateways have received strong demand for applications dealing with intrusion detection, keyword blocking, antivirus and antispam. Accordingly, we were motivated to propose an appropriate fast scalable automaton-matching (FSAM) hardware to accelerate the embedded network processors. Although automaton matching algorithms are robust with deterministic matching time, there is still plenty of room for improving their average-case performance. FSAM employs novel prehash and root-index techniques to accelerate the matching for the nonroot states and the root state, respectively, in automation based hardware. The prehash approach uses some hashing functions to pretest the input sub-string for the nonroot states while the root-index approach handles multiple bytes in one single matching for the root state. Also, FSAM is applied in a prevalent automaton algorithm, Aho-Corasick (AC), which is often used in many content-filtering applications. When implemented in FPGA, FSAM can perform at the rate of 11.1Gbps with the pattern set of 32,634 bytes, demonstrating that our proposed approach can use a small logic circuit to achieve a competitive performance, although a larger memory is used. Furthermore, the amount of patterns in FSAM is not limited by the amount of internal circuits and memories. If the high-speed external memories are employed, FSAM can support up to 21,302 patterns while maintaining similar high performance.
A simple self-restored fiber Bragg grating (FBG)-based passive sensing ring network
(2009-04-01)
Yeh, Chien-Hung
;
Chow, Chi-Wai
;
Wang, Chia-Husan
;
Shih, Fu-Yuan
;
Wu, Yu-Fu
In this investigation, we propose and experimentally investigate a simple self-restored fiber Bragg grating (FBG)-based sensor ring system. This proposed multi-ring passive sensing architecture does not require active components in the network. In this experiment, the network survivability and capacity for the multi-point sensor systems are also enhanced. Besides, the tunable laser source (TLS) is adopted in a central office (CO) for FBG sensing. The survivability of an eight-point FBG sensor is examined and analyzed. It is cost effective since the sensing system is entirely centralized in the CO. Experimental results show that the proposed system can enhance the reliability of the FBG sensing network for large-scale and multi-point architecture.
Surface Reaction Limited Model for the Evaluation of Immobilized Enzyme on Planar Surfaces
(2009-04-01)
Lee, Cheng-Che
;
Chiang, Han-Ping
;
Li, Kun-Lin
;
Ko, Fu-Hsiang
;
Su, Chien-Ying
Analysis of immobilized enzyme in situ is a crucial step to embed an enzyme onto the planar technology of standard integrated circuit (IC) and microelectromechanical systems (MEMS) for a bioreactor or enzyme-coupled biosensor. A surface reaction limited model, based on a systematized and standardized approach, mathematically derived from mass transfer dynamics and the Michaelis-Menten equation for the measuring the apparent K(m)(star) (Michaelis-Menten constant) and V(max)(star) (maximum reaction rate per unit surface area of catalyst) of an immobilized enzyme on a planar surface was developed. The derived equations for the kinetic model were simulated and experimentally confirmed. A platform of a microflow bioreactor with a one-sided planar catalytic surface that contained immobilized enzyme was constructed. The microfluidic bioreactor was designed to possess a channel height less than that of the diffusion layer thickness in a semi-infinite diffusion process, and K(m)(star) and V(max)(star) of rat phenol sulfotransferase (PST) immobilized on the silicon oxide surface were successfully determined in situ. Variation in kinetic constants and the possible differences in performance between free and immobilized PST are discussed.
Microlens Arrays by Direct-Writing Inkjet Print for LCD Backlighting Applications
(2009-04-01)
Tien, Chun-Hao
;
Hung, Chien-Hsiang
;
Yu, Tsung-Han
;
光電工程學系
;
顯示科技研究所
In this paper, we demonstrated the Inkjet print method to fabricate a ultraviolet (UV)-curable epoxy microlens deflecting array with controllable curvature and filling factor, by which a 7-in light guide plate with 82% uniformity and 70% light efficiency was successfully implemented. The microlenses can be directly formed by plastic discharged by inkjet head, eliminating the need for molds and slashing development time. Proposed method will certainly has a promising impact on rapid proto-typing and other specialized microfeatures due to its simplicity and versatility.
公理設計方法於產品設計決策之實證研究：以警報圖像設計為例
(2009-04-01)
梁曉帆
;
范國順
;
盧大平
;
Sheau-Farn Max Liang
;
Kuo-Shunn Fan
產品的成功與否取決於其開發流程中之決策制定。而產品人機介面中圖像設計的決策問題特性在於圖像設計的決策目標沒有明確與有效的衡量方法以及可能的備選方案數量太多。因此，本研究嘗試以使用者對於圖像元件之偏好程度爲基礎，結合公理設計方法，以程序控制系統中之警報圖像設計爲例，對圖像設計的決策問題提出新的決策方法，使其能明確與有效的衡量決策目標，並能控制備選方案的數量，使決策者能根據此方法所預測的後果選取最好的方案。除了說明此方法的決策過程與步驟之外，再以一實驗驗證其預測後果之準確性。此實驗先透過問卷調查80位化學工程系的大學生對於警報圖像元件之偏好程度，再以此爲基礎產生六組警報圖像設計之備選方案，並應用公理設計方法對此六組方案進行篩選與排序，最後以另外96位化學工程系大學生爲實驗的受測者，依六組圖像設計之備選方案分爲六組，即每一組有16位受測者，以電腦測驗方式紀錄受測者對於備選方案圖像辨識的正確率與答題時間，再以統計分析方式得到實驗結果。實驗發現在考慮圖像辨認正確率與答題時間下，實驗結果與以公理設計方法所得到的結果一致。因此，公理設計方法應能有效地應用於程序控制系統之警報圖像設計決策問題。最後討論有關此方法之精鍊與應用範圍之擴展的可能未來研究方向。
The Interplay between Customer Participation and Difficulty of Design Examples in the Online Designing Process and Its Effect on Customer Satisfaction: Mediational Analyses
(2009-04-01)
Chang, Chia-Chi
;
Chen, Hui-Yun
;
Huang, I-Chiang
;
管理科學系
;
Department of Management Science
In the current consumer-centric economy, consumers increasingly desire the opportunity to design their own products in order to express more effectively their self-image. Mass customization, based on efficient and flexible modulization designs, has provided individualized products to satisfy this desire. This work presents an experiment employed to demonstrate that customer participation leads to higher satisfaction. Specifically, the increment in customer satisfaction due to participation is greater when an easy example is provided than when either no example or a difficult one is provided. Additionally, self-congruity plays a mediating role on the customer participation-satisfaction relationship, and this mediating effect varies across different levels of the design example provided in the design process. When an easy design example is present, customer participation has a direct effect on satisfaction, in addition to the indirect effect of self-congruity. When a difficult example is provided, customer participation does not have incremental effects on either self-congruity or customer satisfaction. Finally, when no design example is shown to customers, contrary to our expectation, participation still enhances customer satisfaction due to an increased sense of self-congruity.
磁性薄膜對液晶分子之水平及垂直配向方法
(2009-04-01)
趙如蘋
;
吳信穎
一種磁性薄膜對液晶分子之水平及垂直配向方法,係利用一直流離子濺鍍裝置(Direct-current Ion Sputter)所生成之透明磁性薄膜,可提供液晶分子幾近垂直排列之狀態。而在經由傳統摩刷處理後之透明磁性薄膜,則可更進一步提供有預傾角之水平或垂直排列之狀態。因此,藉由控制該透明磁性薄膜之成膜條件可改變其磁特性,再由控制其摩刷條件可改變其對液晶之預傾角大小及配向模式,因而可增加其應用範圍。本發明不僅製程手續簡便,並且與傳統之直流或交流電漿源設備共用亦同樣具有高透光度、硬度及絕緣性等特性。除了可降低其成本外,該透明磁性薄膜本身具有之磁性,更無須額外之配向處理程序即可達到非接觸式(Non-contact)多重區域(Multi-domain)配向之效果。
Purification, crystallization and preliminary X-ray crystallographic analysis of xylose reductase from Candida tropicalis
(2009-04-01)
Chen, Li-Chun
;
Huang, Sheng-Cih
;
Chuankhayan, Phimonphan
;
Chen, Chung-Der
;
Huang, Yen-Chieh
Xylose reductase (XR), which requires NADPH as a co-substrate, catalyzes the reduction of D-xylose to xylitol, which is the first step in the metabolism of D-xylose. The detailed three-dimensional structure of XR will provide a better understanding of the biological significance of XR in the efficient production of xylitol from biomass. XR of molecular mass 36.6 kDa from Candida tropicalis was crystallized using the hanging-drop vapour-diffusion method. According to X-ray diffraction data from C. tropicalis XR crystals at 2.91 angstrom resolution, the unit cell belongs to space group P3(1) or P3(2). Preliminary analysis indicated the presence of four XR molecules in the asymmetric unit, with 68.0% solvent content.
A systematic procedure to obtain a preferable and robust ranking of units
(2009-04-01)
Liu, Fuh-Hwa Franklin
;
Peng, Hao Hsuan
;
工業工程與管理學系
;
Department of Industrial Engineering and Management
This paper introduces one systematic procedure for the manager of an organization to assess units under its governance using multiple performance indices. The goal of this systematic procedure is to assist the manager in obtaining a preferable and robust ranking result for units. In this procedure, for all units, one common set of weights attached to the performance indices is determined in order to maximize the group's comprehensive score. Then. using the common set of weights, each unit's comprehensive score is evaluated and compared for ranking. In order to obtain the preferable ranking, the manager's subjective preference is considered and formulated by the virtual weights restrictions while determining the common weights in the procedure. The procedure is applied in order to obtain a robust ranking by modifying the boundary of the feasible region of virtual weights restrictions in each assessment. The final statistical ranking of all assessments provides the manager with one robust ranking, which is invariant in different feasible regions of virtual weights restrictions in the numerical example. (C) 2007 Elsevier Ltd. All rights reserved.
REGRESSION ANALYSIS FOR CUMULATIVE INCIDENCE PROBABILITY UNDER COMPETING RISKS
(2009-04-01)
Chang, Wei-Hwa
;
Wang, Weijing
;
統計學研究所
;
Institute of Statistics
The cumulative incidence function provides intuitive summary information about competing risks data. Via a mixture decomposition of this function, we study how covariates affect the cumulative incidence probability of a particular failure type at a chosen time point. Without specifying the corresponding failure time distribution, several inference methods are constructed based on imputation and weighting approaches. Large sample properties of the proposed estimators are derived, and their finite sample performances are examined via simulations. For illustrative purposes, the proposed methods are applied to well-known heart transplant data and compared with the analysis of Larson and Dinse (1985). In the on-line Supplement, we also apply our methods to analyze the Taiwan nationwide laboratory-confirmed severe acute respiratory syndrome (SARS) database.