Browsing by Issue Date, starting with "2012-06-15"

Now showing 1 - 20 of 36125

A novel design of wafer yield model for semiconductor using a GMDH polynomial and principal component analysis
(2012-06-15)
Lin, Jun-Shuw
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工業工程與管理學系
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Department of Industrial Engineering and Management
According to previous studies, the Poisson model and negative binomial model could not accurately estimate the wafer yield. Numerous mathematical models proposed in past years were very complicated. Furthermore, other neural networks models can not provide a certain equation for managers to use. Thus, a novel design of this paper is to construct a new wafer yield model with a handy polynomial by using group method of data handling (GMDH). In addition to defect cluster index (CIM), 12 critical electrical test parameters are also considered simultaneously. Because the number of input variables for GMDH is inadvisable to be too many, principal component analysis (PCA) is used to reduce the dimensions of 12 critical electrical test parameters to a manageable few without much loss of information. The proposed approach is validated by a case obtained in a DRAM company in Taiwan. (C) 2011 Elsevier Ltd. All rights reserved.
Modeling volatilization of residual VOCs in unsaturated zones: A moving boundary problem
(2012-06-15)
Abbas, Talib R.
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Yu, Jung-Hau
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Fen, Chiu-Shia
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Yeh, Hund-Der
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Yeh, Li-Ming
It is of practical interest to investigate the natural evaporation of volatile organic compounds (VOCs) after the removal of a leaking tank situated on the top of the soil. This study aims to develop a mathematical model to predict mole fraction distributions and migration of evaporation front for two VOCs emanating from residual non-aqueous phase liquid (NAPL) due to the leak from the tank in a homogeneous soil. Considering the location of the front and the regions above and below the front, a numerical model for the diffusive transport of VOCs in unsaturated soils was developed using the finite difference method with a moving grid approach. The model was further simplified to the case of single VOC and solved analytically by Boltzmann's transformation with a moving boundary. Analytical expressions for the depth and moving speed of the front for a single VOC were then obtained for practical use. Finally, the developed model was used to predict the concentration distributions of VOCs below the land surface and examine the factors affecting the location and moving speed of the evaporation front. (C) 2012 Elsevier B.V. All rights reserved.
Global bifurcation and exact multiplicity of positive solutions for a positone problem with cubic nonlinearity
(2012-06-15)
Tzeng, Chih-Chun
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Hung, Kuo-Chih
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Wang, Shin-Hwa
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應用數學系
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Department of Applied Mathematics
We study the global bifurcation and exact multiplicity of positive solutions of {u'' (chi) + lambda f(epsilon)(u) = 0, -1 < chi < 1, u(-1) = u(1) = 0, f epsilon(u) = -epsilon u(3) + sigma u(2) - kappa u + rho, where lambda, epsilon > 0 are two bifurcation parameters, and sigma, rho > 0, 0 < kappa <= root sigma rho are constants. We prove the global bifurcation of bifurcation curves for varying epsilon > 0. More precisely, there exists (epsilon) over tilde > 0 such that, on the (lambda, parallel to u parallel to infinity)-plane, the bifurcation curve is S-shaped for 0 < epsilon < (epsilon) over tilde and is monotone increasing for epsilon >= (epsilon) over tilde. Thus we are able to determine the exact number of positive solutions by the values of epsilon and lambda. Our results extend those of Hung and Wang (K.-C. Hung, S.-H. Wang, Global bifurcation and exact multiplicity of positive solutions for a positone problem with cubic nonlinearity and their applications, Trans. Amer. Math. Soc., in press) from kappa <= 0 to kappa <= root sigma rho. (C) 2012 Elsevier Inc. All rights reserved.
Characterizations on the amidized multiwalled carbon nanotubes grafted with polyaniline via in situ polymerization
(2012-06-15)
Wu, Yi-Jhen
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Chao, Liang
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Ho, Ko-Shan
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Huang, Ying-Jie
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Huang, Yu-Lan
A multiwalled carbon nanotubes (MWCNTs) were carboxylated after refluxing with sulfuric and nitric acids. These attached carboxylic acid groups were further condensated with o-phenylene diamine into amide catalyzed by dicyclohexyl carbodiimide (DCC). The obtained amidized MWCNTs were in situ-polymerized with aniline monomers to graft a conducting polyaniline (PANI) onto MWCNT (ES-g-MWCNTs) through the polymerization occurring in the ortho- and meta-positions. The reduced conductivity of the MWCNT after carboxylation can be recovered after grafting with PANI, which owns a strong ?max at the near infrared region due to the extended conjugation from MWCNTs to PANI. Transmission electronic microscopic pictures show a gradual broadening of the MWCNT diameter after carboxylation, amidization, and polymerization. The weight loss from the thermogravimetric thermograms due to the carboxylations of MWCNTs, amidized MWCNTs, and the PANI grafted MWCNTs into CO2 can be used to estimate the degree of carboxylation, amidization, and grafting of PANI. The degree of carboxylation of MWCNT calculated from ESCA spectrum is around 23% close to that estimated from TGA thermogram. The doping level of redoped PANI-grafted MWCNT is found to be 27.78% much less than the maximum 50% of neat PANI. (c) 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Numerical Study of (0001) Face GaN/InGaN p-i-n Solar Cell With Compositional Grading Configuration
(2012-06-15)
Kuo, Yen-Kuang
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Lin, Bing-Cheng
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Chang, Jih-Yuan
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Chen, Fang-Ming
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Kuo, Hao-Chung
The advantages of a (0001) face GaN/InGaN p-i-n solar cell with compositional grading configuration between i-InGaN/p-GaN layers are studied numerically. With the use of the grading layer, the conversion efficiency is markedly promoted due to the reduction of potential barrier height for holes and due to the decrease of polarization. Optimized conversion efficiency is obtained when the thickness of the grading layer increases to a critical value. This critical thickness is strongly influenced by the polarization charges and doping concentration of the grading layer. When the density of the polarization charges is high or the doping concentration is low, a thick grading layer is required to achieve high efficiency.
Effects of the PdO nanoflake support on electrocatalytic activity of Pt nanoparticles toward methanol oxidation in acidic solutions
(2012-06-15)
Chen, Chung-Shou
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Pan, Fu-Ming
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材料科學與工程學系
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Department of Materials Science and Engineering
We prepared PdO nanoflake thin films on carbon cloths by reactive sputtering deposition, and studied electrocatalytic performance of Pt nanoparticles electrodeposited on the PdO thin film in methanol oxidation reaction (MOR) in acidic media. The PdO nanoflake thin film exhibits a cyclic voltamperometric (CV) behavior similar to metallic Pd electrodes because a metallic Pd surface layer is formed on the PdO thin film electrode under the CV measurement condition. The nanoflake morphology of the PdO electrode provides a large surface area for Pt nanoparticle loading, resulting in a large electrochemical active surface area (ESA). The Pt/PdO electrode has a high electrocatalytic activity toward MOR, and the good electrocatalytic performance of the Pt/PdO electrode is ascribed to a high CO tolerance and the large ESA. We suggest that the high CO tolerance of the catalyst on the Pt/PdO electrode is a result of the synergism of the bifunctional mechanism and the electronic effect. XPS analyses indicate that negative charge transfer occurs from the PdO support to the Pt nanoparticles, indicating the presence of the electronic effect. Pt nanoparticles on the PdO support can greatly alleviate the nanoflake damage during the CV measurement, which results from anodic dissolution of metal Pd from the PdO support in acidic media. (C) 2012 Elsevier B.V. All rights reserved.
A study of phase transition behaviors of chalcogenide layers using in situ alternative-current impedance spectroscopy
(2012-06-15)
Huang, Yin-Hsien
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Huang, Yu-Jen
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Hsieh, Tsung-Eong
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材料科學與工程學系
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Department of Materials Science and Engineering
Electrical properties of chalcogenide thin films, both pristine Ge2Sb2Te5 (GST) and cerium-doped GST, were investigated by in situ alternative-current (AC) impedance spectroscopy. With the aid of brick-layer model and nano-grain composite model, the roles of grain and grain-boundary on the phase transition of chalcogenides were distinguished and the dominance of grain boundary was observed. Tangent loss behaviors deduced by impedance analysis revealed alien-element doping alters the interfacial polarization and delays the phase-transition rate of GST. Analytical results also illustrated that the in situ AC impedance spectroscopy can be an alternative tool for characterizing the phase-change kinetics of chalcogenides thin films with nano-scale grain sizes. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4729528]
Synthesis and characterization of sulfonated polytriazole-clay proton exchange membrane by in situ polymerization and click reaction for direct methanol fuel cells
(2012-06-15)
Huang, Yao-Jheng
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Ye, Yun-Sheng
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Syu, Yu-Jyuan
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Hwang, Bing-Joe
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Chang, Feng-Chih
Sulfonated polytriazole-clay (SFTA-clay) nanocomposites are successfully prepared by in situ polymerization of SPTA using click chemistry in the presence of propargyl-functionality modified clay. The clay layers are exfoliated and well dispersed within the SPTA matrix resulting in improvements in thermal stability, mechanical strength, methanol permeability, water retention, ion channel size, and ionic cluster distribution. The SPTA-clay nanocomposite membranes with small amounts of clay in the SPTA matrices possess higher selectivity's; defined as the ratio of proton conductivity to methanol permeability, and thus have potential as proton exchange membranes (PEMs) in direct methanol fuel cells (DMFCs). (C) 2012 Elsevier B.V. All rights reserved.
Applying hierarchical grey relation clustering analysis to geographical information systems - A case study of the hospitals in Taipei City
(2012-06-15)
Wu, Wen-Hsiang
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Lin, Chin-Tsai
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Peng, Kua-Hsin
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Huang, Chiu-Chin
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管理科學系
Deng proposed grey clustering analysis (GCA) in 1987. Later, Jin presented a new method in 1993, called grey relational clustering (GRC) method that combined grey relational analysis with clustering. However, the CRC method cannot use a tree diagram to make appropriate classification decisions without re-computation. This study thus attempts to combine CRC and hierarchical clustering analysis. Given the existence of an excess of medical resources in the Taipei area, this study attempts to understand the degree of concentration of medical resources in this area. Specifically, this study applies a geographical information system (GIS) to present the geographical distribution of hospitals in Taipei. Additionally, a new-type of cluster analysis, known as hierarchical grey relation clustering analysis, is used to analyze the distribution of hospitals and understand how they compete with one another. The analytical results demonstrate that hierarchical grey relation clustering analysis is a suitable method of analyzing geographical position. Tree diagrams can help policymakers make appropriate classification decisions without re-computation. The study results can inform hospitals of their competitors and help them to develop appropriate responses. Additionally, the analytical results can also provide a reference to government or hospital policymakers to help them position hospitals in areas, thus achieving a better distribution of medical resources in Taipei. (C) 2012 Elsevier Ltd. All rights reserved.
液晶透鏡結構及其驅動方法
(2012-06-16)
林怡欣
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林弘峻
本發明係揭露一種液晶透鏡結構及其驅動方法,此液晶透鏡結構包含上基板、下基板、液晶及高分子複合薄膜及液晶層。上基板具有第一導電層和第一配向層。下基板具有第二導電層和第二配向層。液晶及高分子複合薄膜設置於第一配向層之一側,並形成第一透鏡。液晶層設置於液晶及高分子複合薄膜和第二配向層之間,並形成第二透鏡。藉由內建液晶及高分子複合薄膜,以實現低電壓及大對焦範圍之液晶透鏡。
螢光材料及使用其之發光裝置
(2012-06-16)
陳登銘
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郭德文
本發明係有關於一種新穎螢光材料，其化學式如下：(A1-xMx)8D12O24S2，其中，x、A、M及D定義如說明書中所述。此外，本發明更提供使用上述新穎螢光材料之發光裝置。
靜電放電防護裝置
(2012-06-16)
黃曄仁
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周業甯
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柯明道
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陳穩義
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洪嘉偉
一種靜電放電防護裝置包括,一基底、一第一摻雜區、一第二摻雜區、一第三摻雜區、一閘極以及複數第一金屬接觸窗。基底具有一第一導電型態。第一摻雜區形成在基底之中,並具有一第二導電型態。第二摻雜區形成在基底之中,並具有第二導電型態。第三摻雜區形成在基底之中,具有第一導電型態,並位於第一及第二摻雜區之間。閘極形成在基底之上,並位於第一及第二摻雜區之間。閘極具有一第一開口。第一金屬接觸窗穿過第一開口,接觸第三摻雜區。
形成單層光子晶體結構之方法
(2012-06-16)
吳樸偉
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黃苡叡
一種形成單層光子晶體結構之方法，包含下列步驟：(1)將電泳懸浮液、工作電極及下電極設置於容器中，其中，該工作電極及該下電極係分別設置於該容器中之上方及下方而相間隔一距離；以及(2)施加電壓於該工作電極及該下電極上以形成電場，使得電泳懸浮液中之粒子於該電場及重力場之交互作用下，藉由電泳自組裝技術以形成單層光子晶體結構於該工作電極上。據此，藉由本發明之方法可形成品質佳、再現性高以及設備、原物料成本低廉的單層光子晶體結構。
防禦差分功率分析攻擊之方法及電子裝置
(2012-06-16)
劉柏均
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張錫嘉
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李鎮宜
一種電子裝置包括一資料加解密處理單元、一亂數產生器與一差分功率分析防禦電路。資料加解密處理單元在進行加密或解密複數位元之資料時,可提供一致能訊號,亂數產生器可產生亂數資料。差分功率分析防禦電路在接收到致能訊號時,可依據這些位元之資料及亂數資料而運作。
可消除噪音且增進語音品質之麥克風陣列架構及其方法
(2012-06-16)
白明憲
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陳俊宏
本發明提供一種可消除噪音且增進語音品質之麥克風陣列架構及其方法,利用至少二麥克風接收含有噪音訊號及語音訊號之麥克風訊號,利用快速傅立葉轉換將麥克風訊號轉換至頻率域,接著計算麥克風訊號中噪音訊號及語音訊號之夾角,並依據此夾角選擇使用相位差演算法、噪音消去法或二者合併使用,若使用相位差演算法,則再計算麥克風訊號之間的相位差以獲得時間域及空間域之遮蔽訊號,再將遮蔽訊號乘上麥克風訊號之平均而得到麥克風訊號中之語音訊號,去除噪音部分,增進語音品質。
一種低壓降電壓穩壓器及其使用方法
(2012-06-16)
陳家敏
;
洪崇智
本發明揭露一種低壓降電壓穩壓器及其使用方法,其可應用在SoC晶片內部之電壓穩壓單元,亦可單獨作為無需外部大電容之電源管理積體電路,在無晶片外部電容情況下同時具有高迴路增益與穩定度,也具有快速的負載暫態/線上暫態響應特性。從零負載電流到設定的最大負載電流都可以維持好的穩定度。回授控制迴路提供高的迴路增益,因此具有更佳的負載穩壓與線上穩壓特性。本發明同時具有操作功率損耗低及低雜訊之穩定電壓輸出之特性。
原式搖滾　排灣混拉丁
(2012-06-17)
施勗皓
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Department of Communication and Technology
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傳播與科技學系
Boxing的前身為Sun Eagles樂團，團員都是來自屏東的排灣族人。成軍一年多的Boxing樂團，在2011年貢寮海洋音樂祭，獲得海洋音樂大賞的殊榮。特殊的拉丁曲風加上原住民元素，結合出專屬於Boxing樂團的獨特風格。
耐力與合作　激勵女性運動
(2012-06-17)
戴子嘉
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Department of Communication and Technology
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傳播與科技學系
綜觀全世界，社會對於女性從事體育活動，一向帶有刻板印象，由於男女先天生理結構的差異，導致一般人比較忽略女生的運動表現。
城市紀錄　Live House
(2012-06-17)
鄭巧琪
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Department of Communication and Technology
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傳播與科技學系
Live House並非酒店、PUB，對於獨立音樂來說是很大的推手，在一個城市裡也扮演了相當重要的角色，它可以記錄一個城市的文化。但是對於台灣來說，卻沒有一個完善的措施給予Live House經營，導致延伸出許多問題....
慢食　人與食物的對話
(2012-06-17)
張繼云
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Department of Communication and Technology
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傳播與科技學系
慢食反對吃進大量一致性的食品，支持傳統食物、保存當地飲食文化習慣，希望吃下去的食物是美好、純淨、公平的。