Browsing by Issue Date, starting with "2005-07-01"

Now showing 1 - 20 of 66449

Sol-gel-derived Zn((1-x))Mg(x)O thin films used as active channel layer of thin-film transistors
(2005-07-01)
Lee, JH
;
Lin, P
;
Lee, CC
;
Ho, JC
;
Wang, YW
Sol-gel derived n-type Zn((1-x))Mg(x)O (x = 0-0.45) thin films and thin-film transistors (TFTs) with active channel layers made of the films were investigated. The films were prepared at 500 degrees C. The effects of Mg doping on the crystallinity, optical transparency, grain size, and charge-carrier concentration (n) of the films were examined. The Fermi level of the films, as derived from the temperature dependence of n, was similar to 0.12eV below the conduction band. The donor concentration and donor level (E(d)) were derived by a curve fitting method based on the electrical neutrality condition. Ed was found to be similar to 0.3 eV below the conduction band. The composition dependence of the TFT output characteristics was interpreted and correlated to the width of the depletion region adjacent to the grain boundaries. When the grains were almost depleted at x = 0.2, the TFT showed an enhancement mode and an on/off ratio of 10(6).
A convenient solver for solving optimal control problems
(2005-07-01)
Huang, CH
;
Tseng, CH
;
機械工程學系
;
Department of Mechanical Engineering
This paper focuses on the development of a solver for solving optimal control problems. A developed numerical optimal control module integrated with the Sequential Quadratic Programming method is introduced. An optimal control problem solver based on the proposed method is implemented to solve optimal control problems efficiently in engineering applications. In addition, a systematic procedure for solving optimal control problems by using the optimal control problem solver is also proposed. A time-optimal benchmark problem presented in the literature is used to illustrate for the capability and facility of solving optimal control problems. The numerical results demonstrate the proposed method and the procedure suggested in this paper are helpful to engineers in solving optimal control problems in a systematic and efficient manner.
A robust high-Q micromachined RF inductor for RFIC applications
(2005-07-01)
Lin, JW
;
Chen, CC
;
Cheng, YT
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
In this paper, a robust micromachined spiral inductor with a cross-shaped sandwich membrane support is proposed and fabricated with fully CMOS compatible post-processes for radio frequency integrated circuit (RFIC) applications. Via the incorporation of a sandwich dielectric membrane (0.7 mu M SiO2/0.7 mu M Si3N4/0.7 mu m TEOS) to enhance the structure rigidity, the inductor can have better signal stability. In comparison, the new design of a similar to 5-nH micromachined inductor can have 45% less inductance variation than the one without the dielectric support while both devices are operated with 10 m/s(2) acceleration. Meanwhile, using a cross shape instead of blanket membrane can also effectively eliminate the inductance variation induced by the working temperature change (20 degrees C to 75 degrees C). The measurement results show the robust inductor can have similar electrical performance to the as-fabricated freely suspended inductor, which has five times Q (quality factor) improvement than the inductor without the substrate removal. It is our belief that the new micromachined inductors can have not only high-Q performance but also better signal stability suitable for wide-range RFIC applications.
Machine learning with automatic feature selection for multi-class protein fold classification
(2005-07-01)
Huang, CD
;
Liang, SF
;
Lin, CT
;
Wu, RC
;
電控工程研究所
In machine learning, both the properly used networks and the selected features are important factors which should be considered carefully. These two factors will influence the result, whether for better or worse. In bioinformatics, the amount of features may be very large to make machine learning possible. In this study we introduce the idea of feature selection in the problem of bioinformatics. We use neural networks to complete our task where each input node is associated with a gate. At the beginning of the training, all gates are almost closed, and, at this time, no features are allowed to enter the network. During the training phase, gates are either opened or closed, depending oil the requirements. After the selection training phase has completed, gates corresponding to the helpful features are completely opened while gates Corresponding to the useless features are closed more tightly. Some gates may be partially open, depending oil the importance of the corresponding features. So, the network can not only select features in an online manner during learning, but it also does some feature extraction. We combine feature selection with our novel hierarchical machine learning architecture and apply it to multi-class protein fold classification. At the first level the network classifies the data into four major folds: all alpha, all beta, alpha + beta and alpha/beta. In the next level, we have another set of networks which further classifies the data into twenty-seven folds. This approach helps achieve the following. The gating network is found to reduce the number of features drastically. It is interesting to observe that, for the first level using just 50 features selected by the gating network, we can get a test accuracy comparable to that using 125 features in neural classifiers. The process also helps us get a better insight into the folding process. For example, tracking the evolution of different gates, we call find which characteristics (features) of the data are more important for the folding process. Eventually, it reduces the computation time. The use of the hierarchical architecture helps LIS get a better performance also.
Histidine residue at position 234 of oxidosqualene-lanosterol cyclase from Saccharomyces cerevisiae simultaneously influences cyclization, rearrangement, and deprotonation reactions
(2005-07-01)
Wu, TK
;
Liu, YT
;
Chang, CH
;
應用化學系分子科學碩博班
;
Institute of Molecular science
Histidine Residue at Position 234 of Oxidosqualene-Lanosterol Cyclase from Saccharomyces cerevisiae Simultaneously Influences Cyclization, Rearrangement, and Deprotonation Reactions
雙觸發矽控整流元件與使用其之靜電保護電路
(2005-07-01)
柯明道
;
徐國鈞
一種雙觸發矽控整流元件與使用其之靜電保護電路。此種雙觸發矽控整流元件係在一個P型基底中配置了數個N＋擴散區域、數個P＋擴散區域、第一N型井區域、第二N型井區域和第三N型井區域。每一個N＋擴散區域和P＋擴散區域中間，都以淺溝渠結構加以隔離。在P＋擴散區域內的其中二個，係雙觸發矽控整流元件的P型觸發區。而在N＋擴散區域內的其中二個，係雙觸發矽控整流元件的N型觸發區。
Electron-phonon-impurity interference effect in disordered Au56Pd44 and IrO2 thick films
(2005-07-01)
Yeh, SS
;
Lin, JJ
;
Jing, XN
;
Zhang, DL
;
電子物理學系
We have fabricated a series of Au56Pd44 thick films with a wide range of residual resistivity rho(0) varying from 40 to 280 mu Omega cm. The resistivities of these films were measured between 15 and 300 K. We found that at temperatures below about 0.1 theta(D) (theta(D) is the Debye temperature), the interference mechanism between the elastic electron scattering and electron-phonon scattering (the electron-phonon-impurity interference effect) contributes significantly to the measured resistivities. Our results support the current theoretical idea that this interference-mechanism-induced resistivity varies with rho(0)T(2), where T is the temperature. Similar observation has also been made in disordered, conducting transition-metal oxide IrO2 thick films.
Punching shear strength of reinforced concrete slabs strengthened with glass fiber-reinforced, polymer laminates
(2005-07-01)
Chen, CC
;
Li, CY
;
土木工程學系
;
Department of Civil Engineering
This study investigates the punching shear strength and failure behavior of reinforced concrete slabs strengthened with glass fiber-reinforced polymer (GFRP) laminates. The parameters of the 18 specimens.studied herein are concrete compressive strength, steel reinforcement ratio, and the number of GFRP laminate layers. The specimens were tested simply supported along the four sides of the slabs and loaded through the stub column. The behavior of the concrete slabs reinforced with GFRP laminates in addition to steel reinforcement is compared to that of slabs with steel reinforcement. Experimental test results indicate that applying GFRP laminates markedly increases the punching shear capacity of slab-column connections. Based on these results, a design procedure is presented to calculate the ultimate punching shear strength of slab-column connections strengthened by the GFRP laminates. Good correlations between predicted and experimental results have been achieved.
Performance and reliability of poly-Si TFTs on FSG buffer layer
(2005-07-01)
De Wang, S
;
Chang, TY
;
Chien, CH
;
Lo, WH
;
Sang, JY
A novel and process-compatible scheme for fabricating poly-Si thin-film transistors (TFTs) on an FSG buffer layer was proposed and demonstrated. Experimental results reveal that remarkably improved device performance and uniformity can be achieved with appropriate fluorine concentration. The poly-Si TFTs fabricated on FSG layers have a higher on-current, a lower leakage current, and a higher field-effect mobility compared with the conventional poly-Si TFTs. Furthermore, the incorporation of fluorine also increased the reliability of poly-Si TFTs against hot carrier stressing, which is attributed to the formation of Si-F bonds.
網路經濟時代下企業整合型資料庫建置暨應用效益－以NIIS中央資料庫建置為例
(2005-07-01)
邱瑞科
;
郭建吾
;
陳聖棋
;
Ruey-Kei Chiu
;
Chien-Wu Kuo
本研究提出一個建置企業整合型資料庫的設計架構，它藉由資料選擇性複製策略的方式，將分散於各地方的資料庫萃取並彙整至企業營運總部，建立一個可以更有效提供企業管理及決策所需資訊的整合型企業資料庫。本研究並以我國衛生署疾病管制局預防接種管理系統(National Immunization Information System, NIIS)之實驗性中央資料庫設計及建立為研究之實作案例，將分散於各縣市衛生局、衛生所之預防接種相關資料庫進行彙集並整合建立一個可有效支援建立全國預防接種管理及決策系統所需資料來源之中央資料庫。為實證中央資料庫建置可更有效支援NIIS決策支援之真實價值，本研究乃進一步嘗試應用本研究所建立的中央資料庫作為資料來源，建立可支援我國年度疫苗接種採購預測模式，提供疾病管制局作為年度各類型疫苗最適採購量之依據，用以取代原有以人工經驗計算之方式。在此一決策應用的研究中，第一階段推估分別應用灰色預測模式及倒傳遞類神經網路預測模式，根據歷年地方衛生所疫苗施打人數、疫苗施打完成率及新年度疫苗施打的目標人數，建構新年度疫苗施打人數預測模式，實驗結果顯示，倒傳遞應用類神經網路比灰色理論可以獲得較佳的預測值。第二階段應用第一階段所得之新年度疫苗施打人數預測量，進一步合併考量疫苗耗損率、保留庫存及上年度之疫苗庫存量等因素進行全國性新年度預防接種疫苗最適採購量之計算。實驗性中央資料庫系統建置完成後，由實證結果得知，應用中央資料庫為資料來源所建立之年度疫苗採購量預測模式相較於傳統人工計算模式能夠得到更精準的下年度疫苗採購量。它不僅可對疫苗採購之最佳化規劃提供最完整的資料來源，更可提供快速支援全國性預防接種管理性統計分析報表及資訊產生之功能。
Query processing in a mobile computing environment: Exploiting the features of asymmetry
(2005-07-01)
Peng, WC
;
Chen, MS
;
資訊工程學系
;
Department of Computer Science
With the cutting edge technology advance in wireless and mobile computers, the query processing in a mobile environment involves join processing among different sites which include static servers and mobile computers. Because of the need for energy saving and also the presence of asymmetric features in a mobile computing environment, the conventional query processing for a distributed database cannot be directly applied to a mobile computing system. In this paper, we first explore three asymmetric features of a mobile environment. Then, in light of these features, we devise query processing methods for both join and query processing. Intuitively, employing semijoin operations in a mobile computing environment is able to further reduce both the amount of data transmission and energy consumption. A semijoin which is initiated by a mobile computer ( respectively, the server) and is beneficial to reduce the cost of a join operation is termed a mobile- initiated or MI ( respectively, server- initiated or SI) profitable semijoin. According to those asymmetric features of a mobile computing system, we examine three different join methods and devise some specific criteria to identify MI/ SI profitable semijoins. For query processing, which refers to the processing of multijoin queries, we develop three query processing schemes. In particular, we formulate the query processing in a mobile computing system as a two- phase query processing procedure that can determine a join sequence and interleave that join sequence with SI profitable semijoins to reduce both the amount of data transmission and energy consumption. Performance of these join and query methods is comparatively analyzed and sensitivity analysis on several parameters is conducted. Furthermore, we develop a systematic procedure to derive the characteristic functions of MI and SI profitable semijoins. It is noted that, given some system parameters, those characteristic functions are very important in determining which join method is the most appropriate one to employ in that configuration. It is shown by our simulation results that, by exploiting the three asymmetric features, these characteristic functions are very powerful in reducing both the amounts of energy consumption and data transmission incurred and can lead to the design of an efficient and effective query processing procedure for a mobile computing environment.
Synthesis and magnetic properties of highly arrayed nickel-phosphate nanotubes
(2005-07-01)
Lin, SC
;
Chen, SY
;
Cheng, SY
;
Lin, JC
;
交大名義發表
In this study, nanotube arrays of nickel-phosphate have been developed by electroless deposition into sub-micro to nanometer sized pores of the porous alumina templates by hypophosphite electrolytic solution composed of NiSO4, NaH2PO2, NaC2H3O2 and Na3C6H5O7 at 80-100 degrees C and PH = 3-6. The dimension of the formed nanotubes has 1 mu m in length, 200-300 nm in diameter and 80-150 nm in thickness of tube walls. Transmission electron microscopy examination of the nanotubes clearly show amorphous hallow structure with a average grain size of similar to 5 nm. The hysteresis loops of the nanotube arrays show a coercive field of about 200 Oe under treatment in 95%N-2/5%H-2 atmosphere at 500 degrees C as the magnetic field was applied along parallel and perpendicular to tube axis. The nanotube arrays also exhibit an anisotropic magnetic property with easier saturation along the perpendicular direction. However, both coercive field and saturation of remanent magnetization of the nanotube arrays become lower while continually increasing heat treatment temperature up to 900 degrees C. (c) 2005 Elsevier SAS. All rights reserved.
A numerical iterative method for solving Schrodinger and Poisson equations in nanoscale single, double and surrounding gate metal-oxide-semiconductor structures
(2005-07-01)
Li, YM
;
Yu, SM
;
友訊交大聯合研發中心
;
D Link NCTU Joint Res Ctr
Numerical solution of the Schrodinger and Poisson equations (SPEs) plays an important role in semiconductor simulation. We in this paper present a robust iterative method to compute the self-consistent solution of the SPEs in nanoscale metal-oxide-semiconductor (MOS) structures. Based on the global convergence of the monotone iterative (Ml) method in solving the quantum corrected nonlinear Poisson equation (PE), this iterative method is successfully implemented and tested on the single-, double-, and surrounding-gate (SG, DG, and AG) MOS structures. Compared with other approaches, various numerical simulations are demonstrated to show the accuracy and efficiency of the method. (c) 2005 Elsevier B.V All rights reserved.
On-wafer noise-parameter measurement using wide-band frequency-variation method
(2005-07-01)
Hu, R
;
Sang, TH
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
In this paper, it is demonstrated that the newly proposed wide-band frequency-variation method, where only one set of matched and mismatched noise measurements is used, can efficiently determine the noise parameters of an ultra-sensitive transistor on-wafer at room temperature. Since the experimental setup is similar to that of conventional noise-temperature measurement while no complicated hardware is employed, this new approach is straightforward, yet efficient, and can be easily extended to applications with much higher or broader frequency ranges. Both the measured noise parameters of the post-amplifier stage and the transistor under test will be presented and investigated.
Closure to "Investigation on the stability of two-dimensional depth-averaged models for bend-flow simulation" by T. Y. Hsieh and J. C. Yang
(2005-07-01)
Hsieh, TY
;
Yang, JC
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土木工程學系
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防災與水環境研究中心
;
Department of Civil Engineering
Consensus scoring criteria for improving enrichment in virtual screening
(2005-07-01)
Yang, JM
;
Chen, YF
;
Shen, TW
;
Kristal, BS
;
Hsu, DF
Virtual screening of molecular compound libraries is a potentially powerful and inexpensive method for the discovery of novel lead compounds for drug development. The major weakness of virtual screening-the inability to consistently identify true positives (leads)-is likely due to our incomplete understanding of the chemistry involved in ligand binding and the subsequently imprecise scoring algorithms. It has been demonstrated that combining multiple scoring functions (consensus scoring) improves the enrichment of true positives. Previous efforts at consensus scoring have largely focused on empirical results, but they have yet to provide a theoretical analysis that gives insight into real features of combinations and data fusion for virtual screening. Results: We demonstrate that combining multiple scoring functions improves the enrichment of true positives only if (a) each of the individual scoring functions has relatively high performance and (b) the individual scoring functions are distinctive. Notably, these two prediction variables are previously established criteria for the performance of data fusion approaches using either rank or score combinations. This work, thus, establishes a potential theoretical basis for the probable success of data fusion approaches to improve yields in in silico screening experiments. Furthermore, it is similarly established that the second criterion (b) can, in at least some cases, be functionally defined as the area between the rank versus score plots generated by the two (or more) algorithms. Because rank-score plots are independent of the performance of the individual scoring function, this establishes a second theoretically defined approach to determining the likely success of combining data from different predictive algorithms. This approach is, thus, useful in practical settings in the virtual screening process when the performance of at least two individual scoring functions (such as in criterion a) can be estimated as having a high likelihood of having high performance, even if no training sets are available. We provide initial validation of this theoretical approach using data from five scoring systems with two evolutionary docking algorithms on four targets, thymidine kinase, human dihydrofolate reductase, and estrogen receptors of antagonists and agonists. Our procedure is computationally efficient, able to adapt to different situations, and scalable to a large number of compounds as well as to a greater number of combinations. Results of the experiment show a fairly significant improvement (vs single algorithms) in several measures of scoring quality, specifically "goodness-of-hit" scores, false positive rates, and "enrichment". This approach (available online at http://gemdock.life. nctu.edu.tw/dock/download.php) has practical utility for cases where the basic tools are known or believed to be generally applicable, but where specific training sets are absent.
杏音慶卅‧陽明三十週年紀念音樂會
(國立陽明大學, 2005-07-01)
陽明電子報編輯小組
為了慶祝陽明三十週年校慶，以及表現薪火相傳、生生不息的精神，愛杏擴大例行性的演出陣容，籌辦了「杏音慶卅」的紀念音樂會；邀請陽明大學師生、校友、台灣聯合大學系統其他三校的樂團來共襄盛舉，期望以音樂會的方式增進社會人文氣息
Mobile construction supply chain management using PDA and bar codes
(2005-07-01)
Tserng, HP
;
Dzeng, RJ
;
Lin, YC
;
Lin, ST
;
土木工程學系
Construction project control aims to effectively obtain real-time information and enhance dynamic control by utilizing information sharing and connecting involved participants of the projects to reduce construction conflicts and project delays. However, extending the construction project control system to job sites is not considered efficient because using notebooks in a harsh environment like a construction site is not particularly a conventional practice. Meanwhile, paper-based documents of the site processes are ineffective and cannot get the quick response from the office and project control center Integrating promising information technologies such as personal digital assistants (PDA), bar code scanning, and data entry mechanisms, can be extremely useful in improving the effectiveness and convenience of information flow in construction supply chain control systems. Bar code scanning is appropriate for several construction applications, providing cost savings through increased speed and accuracy of data entry. This article demonstrates the effectiveness of a bar-code-enabled PDA application, called the mobile construction supply chain management (M-ConSCM) System, that responds efficiently and enhances the information flow between offices and sites in a construction supply chain environment. The advantage of the M-ConSCM system lies not only in improving the efficiency of work for on-site engineers, but also providing the Kanban-like visual control system for project participants to control the whole project. Moreover, this article presents a generic system architecture and its implementation.
93學年度退休人員歡送茶會場邊紀錄
(國立陽明大學, 2005-07-01)
陽明電子報編輯小組
學校為歡送93學年度退休人員，特舉辦一場聯誼性之茶會，讓各單位同事們能共聚一堂，回憶昔日為陽明工作之點滴，以及臨行前之話別。校長致詞時表示，感謝所有退休同仁為陽明所作的服務，因為大家的努力陽明才能發展至今，也祝福每位同仁退休後都能擁有幸福美好的生涯
An integrated logistics operational model for green-supply chain management
(2005-07-01)
Sheu, JB
;
Chou, YH
;
Hu, CC
;
運輸與物流管理系註：原交通所+運管所
;
Department of Transportation and Logistics Management
This paper presents an optimization-based model to deal with integrated logistics operational problems of green-supply chain management (G-SCM). In the proposed methodology, a linear multi-objective programming model is formulated that systematically optimizes the operations of both integrated logistics and corresponding used-product reverse logistics in a given green-supply chain. Factors such as the used-product return ratio and corresponding subsidies from governmental organizations for reverse logistics are considered in the model formulation. Results of numerical studies indicate that using the proposed model, the chain-based aggregate net profits can be improved by 21.1%, compared to the existing operational performance in the particular case studied. © 2004 Elsevier Ltd. All rights reserved.