Browsing by Issue Date, starting with "2009-12-28"

Now showing 1 - 20 of 49053

Role of germanium in the reduced temperature dependence of Ti-based nanocrystals formation for nonvolatile memory applications
(2009-12-28)
Feng, Li-Wei
;
Chang, Chun-Yen
;
Chang, Ting-Chang
;
Tu, Chun-Hao
;
Wang, Pai-Syuan
We investigated the physical and electrical characteristics of Ti-based nanocrystals (NCs) with composition of germanium fabricated by cosputtering titanium silicide and germanium targets for low temperature applications of nonvolatile memory. The addition of Ge significantly reduces the thermal budget necessary for Ti-based NCs formation to 500 degrees C in 2 min due to the rise of its morphological instability and agglomeration properties. Compositions characteristics were analyzed by x-ray photon-emission spectroscopy and formations of NCs were observed by transmission electron microscopy. Additionally, capacitance-voltage characteristics, data retention, and endurance properties are characterized to demonstrate its advantages for nonvolatile memory device applications.
Anharmonic Franck-Condon Simulation of the Absorption and Fluorescence Spectra for the Low-Lying S(1) and S(2) Excited States of Pyridine
(2009-12-31)
Wang, Huan
;
Zhu, Chaoyuan
;
Yu, Jian-Guo
;
Lin, Sheng Hsien
;
應用化學系分子科學碩博班
Anharmonic effects of the absorption and fluorescence spectra of pyridine molecule are studied and analyzed for the two-low lying singlet excited states S(1)((1)B(1)) and S(2)((1)B(2)). The complete active space self-consistent field (CASSCF) method is utilized to compute equilibrium geometries and all 27 vibrational normal-mode frequencies for the ground state and the two excited states. The present calculations show that the frequency differences between the ground and two excited states are small for the ten totally symmetric vibrational modes so that the displaced oscillator approximation can be used for spectrum Simulations. The Franck-Condon factors within harmonic approximation basically grasp the main features of molecular spectra, but simulated 0-0 transition energy position and spectrum band shapes are not satisfactorily good for S(1)((1)B(1)) absorption and fluorescence spectra in comparison with experiment observation. As the first-order anharmonic correction added to Franck-Condon factors, both spectrum positions and band shapes can be simultaneously improved for both absorption and fluorescence spectra. It is concluded that the present anharmonic correction produces a significant dynamic shifts for spectrum positions and improves spectrum band shapes as well. The detailed structures of absorption spectrum of S(2)((1)B(2)) state observed from experiment can be also reproduced with anharmonic Franck-Condon simulation, and these were not shown in the harmonic Franck-Condon simulation with either distorted or Duschinsky effects in the literature.
METHOD FOR FORMING A POROUS MATERIAL
(2009-12-31)
Leu, Jih-Perng
;
Hsu, Kuo-Yuan
;
Hsu, Hsin-Ling
;
Chen, Guan-Yu
;
Takasaka, Nobuo
A method for forming a porous material is to mix a porous first basic material with a sacrificial material compatible with the first basic material to let the sacrificial material permeate into the pores of the first basic material to form a first finished product. Subsequently, the first finished product is mixed with a second basic material and heated over the vaporization temperature of the sacrificial material to let the ingredients of the second basic material change and increase viscous force and impossible to enter the pores of the first basic material. Simultaneously, the sacrificial material is heated and vaporized to exhaust out of the pores of the first basic material, disabling the second basic material to permeate into the pores of the first basic material and thus forming a second finished product for reserving the ingredients in the pores of the first basic material.
METHOD OF DETECTING MOVING OBJECT
(2009-12-31)
LIN, Daw-Tung
;
LIU, Li-Wei
Proposed is a method of detecting a moving object, including: providing an image-set at least including a first image and a second image correlated in a time series, the first image preceding the second image; defining a detecting region and a detecting direction so as to construct a virtual gate in the first image; estimating the motion vector in a time series; comparing, by the virtual gate, the second image with the first image so as to determine a difference therebetween in terms of an object's position and motion vector; and retrieving the object to be an effective moving object upon determination of the object as lying within the detecting region defined in the virtual gate and moving in a direction substantively the same with the detecting direction. This invention presents a moving object detection method without the need to construct a background model a priori.
Dissociation Rate Constant of the Hydrogen Fluoride Dimer by the ab Initio Anharmonic RRKM Theory
(2009-12-31)
Yao, L.
;
Mebel, A. M.
;
Lin, S. H.
;
應用化學系
;
Department of Applied Chemistry
The dissociation rate constants for hydrogen fluoride dimers; are calculated using the YL method, proposed by Yao and Lin (Yao, L.; Mebel, A. M.; Lu, H. F.; Neusser, H. J.; Lin, S. H. J.. Phys. Chem. A 2007, 111, 6722). The dividing surface method and RRKM theory are also used to obtain pseudo-transition states and rate constants, respectively. For the dissociation of HF dimers, the anharmonic rate constants are around 3.02 x 10(10) to 3.46 x 10(12) s(-1), while the harmonic rate constants are in the range of 2.93 x 10(10) to 1.66 x 10(13) s(-1), at a temperature range of 243-1000 K, for the canonical case. For the microcanonical case, the anharmonic rate constants are in the range of 1.91 x 10(12) to 1.32 x 10(13) s(-1) and the harmonic rate constants are in the range of 1.89 x 10(12) to 4.93 x 10(13) s(-1), with a total energy range of 1338-4500 cm(-1). Both harmonic and anharmonic rate constants are only comparable to the experimental results 0.5 x 10(10) s(-1) and 1 x 10(11) s(-1) in an inert gas bath at room temperature. In this case the harmonic and anharmonic rate constants show similar results in this calculation. The results of this paper indicate that the YL method is suitable for calculating dissociation rate constants of small flexible HF dimers and the anharmonic effect should be included.
Fabrication of epitaxial ZnO films by atomic-layer deposition with interrupted flow
(2009-12-31)
Ku, Ching-Shun
;
Huang, Jheng-Ming
;
Lin, Chih-Ming
;
Lee, Hsin-Yi
;
材料科學與工程學系
We formed epitaxial ZnO thin films on a (0001) c-plane sapphire substrate through deposition of atomic layers (ALD) at 25-160 degrees C using diethylzinc (DEZn) and deionized water as precursors in combination with interrupted flow. High-resolution X-ray diffraction measurements were employed to characterize the microstructure of these films. With interrupted flow, we obtained ZnO thin films with an optimal growth window in a range of 40-160 degrees C, effectively decreasing the growth temperature by about 120 degrees C relative to a conventional method involving continuous flow. X-ray reflectivity measurements showed that the rate of growth increased also between 20 degrees C and 120 degrees C. The XRD results indicate that the stock time might extend the reaction of DEZn and water through an increased duration. All results show that a low temperature for growth improves the crystalline quality and is consistent with thermodynamically blocked self-compensation. (C) 2009 Elsevier B.V. All rights reserved.
Anharmonic Franck-Condon Simulation of the Absorption and Fluorescence Spectra for the Low-Lying S-1 and S-2 Excited States of Pyridine
(2009-12-31)
Wang, Huan
;
Zhu, Chaoyuan
;
Yu, Jian-Guo
;
Lin, Sheng Hsien
;
應用化學系分子科學碩博班
Anharmonic effects of the absorption and fluorescence spectra of pyridine molecule are studied and analyzed for the two-low lying singlet excited states S-1(B-1(1)) and S-2(B-1(2)). The complete active space self-consistent field (CASSCF) method is utilized to compute equilibrium geometries and all 27 vibrational normal-mode frequencies for the ground state and the two excited states. The present calculations show that the frequency differences between the ground and two excited states are small for the ten totally symmetric vibrational modes so that the displaced oscillator approximation can be used for spectrum Simulations. The Franck-Condon factors within harmonic approximation basically grasp the main features of molecular spectra, but simulated 0-0 transition energy position and spectrum band shapes are not satisfactorily good for S-1(B-1(1)) absorption and fluorescence spectra in comparison with experiment observation. As the first-order anharmonic correction added to Franck-Condon factors, both spectrum positions and band shapes can be simultaneously improved for both absorption and fluorescence spectra. It is concluded that the present anharmonic correction produces a significant dynamic shifts for spectrum positions and improves spectrum band shapes as well. The detailed structures of absorption spectrum of S-2(B-1(2)) state observed from experiment can be also reproduced with anharmonic Franck-Condon simulation, and these were not shown in the harmonic Franck-Condon simulation with either distorted or Duschinsky effects in the literature.
On the Misconception of Multicollinearity in Detection of Moderating Effects: Multicollinearity Is Not Always Detrimental
(2010)
Shieh, Gwowen
;
管理科學系
;
Department of Management Science
Due to its extensive applicability and computational ease, moderated multiple regression (MMR) has been widely employed to analyze interaction effects between 2 continuous predictor variables. Accordingly, considerable attention has been drawn toward the supposed multicollinearity problem between predictor variables and their cross-product term. This article attempts to clarify the misconception of multicollinearity in MMR studies. The counterintuitive yet beneficial effects of multicollinearity on the ability to detect moderator relationships are explored. Comprehensive treatments and numerical investigations are presented for the simplest interaction model and more complex three-predictor setting. The results provide critical insight that both helps avoid misleading interpretations and yields better understanding for the impact of intercorrelation among predictor variables in MMR analyses.
Improving the E-Store Business Model for Satisfying Customers' Needs Using a Hybrid MCDM Combined DANP with Grey Relational Model
(2010)
Chiu, Wan-Yu
;
Tzeng, Gwo-Hshiung
;
Li, Han-Lin
;
資訊管理與財務金融系註：原資管所+財金所
;
Department of Information Management and Finance
The current paper aims to qualitatively and quantitatively measure and evaluate e-store index criteria used to achieve the aspired levels for satisfying customers' needs. Such research should help e-store managers understand customers' feelings and requirements for improving the e-store business. Therefore, in the current approach, we use a hybrid MCDM model to address the dependent relational problems among the criteria. Specifically, we combine DANP (DEMATEL-based ANP) and grey relation analysis (GRA) methods to calculate the relative importance weights and relation of the criteria between interdependence and feedback. We also propose a strategy to improve the criteria gap for closing to the aspired levels of human life and convenient service. As such, this research can provide e-store managers with an understanding of how to improve business models in order to achieve consumers' needs and promote more repurchases and enable them to devise the best marketing strategies to provide the most effective and efficient service for their customers.
Pre-Treatment of Natural Organic Matters Containing Raw Water using Coagulation
(2010)
Cheng, Ya-Ling
;
Wong, Ruei-Jyun
;
Lin, Justin Chun-Te
;
Huang, Chihpin
;
Lee, Duu-Jong
Coagulation is a commonly adopted process as a pretreatment step for minimizing membrane fouling. Three coagulants, polyaluminum chloride (PACl), alum, and FeCl3 were tested under four mixing-settling schemes for turbidity and natural organic matters (NOM) removal. The organic matters in the raw waters were fractionated by high performance size exclusion chromatography (HP-SEC) system and were characterized using the excitation-emission matrix (EEM) fluorescence spectra. Sufficient rapid mixing and slow mixing or applying two-stage coagulation benefit turbidity removal using PACl or FeCl3 under oelectrostatic patch coagulationo (EPC) mechanism. The EPC mechanism is not efficient for alum coagulation. At higher coagulant doses, the NOM removal is not affected by mixing condition. Intensive rapid mixing alone benefits NOM removal using PACl or FeCl3. Alum is a poor coagulant for NOM removal under EPC mechanism.
Transient Performance of MBR with Flux Enhancing Polymer Addition
(2010)
Zhang, Jin Song
;
Zhou, Ji Ti
;
Su, Yu-Chun
;
Fane, Anthony G.
;
環境工程研究所
The polymeric membrane performance enhancer (MPE50) was applied in two parallel submerged membrane bioreactors to test its effect on membrane fouling. Although the flux enhancer showed significant benefit, the effect of dosage termination caused a dramatic drop in performance relative to the control. The MBRs were compared in three carefully controlled runs performed over 155 days. The total organic carbon (TOC), EPS, and particle size data were collected at regular intervals during the entire operation. In run 1, after a start-up period of 62 days, a stable state was achieved in both MBRs. In run 2, a one-off 400mg/L MPE and 15mg/L MPE daily maintenance dosage were applied in one reactor for 60 days. The ocritical fluxo determined by the flux stepping test was increased by 50% from 20 LMH to 30 LMH after the addition of MPE. Long-term experiments were implemented at three separate levels of constant flux, namely 20, 30, and 40 LMH. At the flux of 20 LMH (below the ocritical fluxo of both reactors with and without MPE), the performance in both reactors was similar. At the flux of 30 LMH (above the ocritical fluxo of the MBR without MPE but below the ocritical fluxo of the MBR with MPE), the addition of MPE was found to mitigate membrane fouling. At a flux of 40 LMH (above the critical flux for both reactors), the TMP rise in the MBR with MPE was slower than the MBR without MPE, although the performance of both MBRs was poor. The performance differences correlated with the increase in the particle size distribution of the activated sludge as well as the low level of SMP and EPS (mainly polysaccharides) concentrations in the supernatant during steady state. In run 3, after terminating the MPE addition, the membrane performance was found to be significantly worse than the MBR without MPE, which suggests that the continuous maintenance dose of MPE is essential upon MPE application to the MBR.
高階助聽器晶片及系統---子計畫五：助聽器類比積體電路設計(I)
(2010)
吳介琮
;
WU JIEH-TSORNG
;
國立交通大學電子工程學系及電子研究所
本計畫是「高階助聽器晶片及系統」整合型計劃的一個子計畫。目的是設計及實現此系統所需要的低功率混合訊號式介面電路，並且將與其他數位電路整合於同一晶片上。本計劃將研發（1）類比數位轉換器；（2）數位Class-D喇叭驅動電路；（3）數位電源控制電路。本計畫是延續前一期計畫的研究成果，將發展新技術，改善以上電路的效能。在麥克風接收端，訊號的頻寬有20 kHz，而訊號的動態範圍（Dynamic Range）可高達100 dB。我們已經研發出新型的Delta-Sigma類比數位轉換器（ADC），配合數位校正技術，可以簡化運算放大器而降低功率消耗。我們將改良此ADC，增進其動態範圍並進一步降低功率消耗。我們會在前端加入可調整增益的放大器（Programmable-Gain Amplifier）來涵蓋麥克風的整個動態範圍。在喇叭端的驅動電路將會是整個助聽器系統最耗電的部份。我們已經設計了一個高性能的Class-D喇叭驅動電路。我們將嘗試降低Class-D驅動電路的失真度。我們也會針對另一個子計畫所開發的微機電喇叭，設計新的Class-D驅動電路。本計畫的電源控制電路是從電池擷取能源，並提供穩定的電壓給系統中其他的電路使用。我們提出數位式的電源控制電路，藉以實現複雜的控制機制來提升電路的效能。此電源控制電路需要一個低功率的ADC。我們會用SAR（Successive-Approximation-Register）的架構來實現此ADC。本計畫的所有電路最後將整合於 90 nm 的 CMOS 單晶片中。以 1 V 電池操作，類比電路的功率消耗不得超過 500 uW。
SOLVING 9 LAYER TRIANGULAR NIM
(2010-01-01)
Shan, Yi-Chang
;
Wu, I-Chen
;
Lin, Hung-Hsuan
;
Kao, Kuo-Yuan
;
資訊工程學系
Triangular Nim, one variant of the game Nim, is a common two-player game in Taiwan and China. In the past, Hsu strongly solved 7 layer Triangular Nim while some of the authors recently strongly solved 8 layer Triangular Nim. The latter required 8 gigabytes in memory and 8878 seconds. Using a retrograde method, this paper strongly solves 9 layer Triangular Nim. In our first version, the program requires four terabytes in memory and takes about 129.21 days aggregately. In our second version, improved by removing some rotated and mirrored positions, the program reduces the memory by a factor of 5.86 and the computation time by a factor of 4.38. Our experiment result also shows that the loss rate is only 5.0%. This is also used to help improve the performance.
應用泛用型最佳化演算架構於無線網路傳輸技術最佳化問題之研究
(2010)
陳穎平
;
CHEN YING-PING
;
國立交通大學資訊工程學系（所）
於現代無線網路傳輸技術高度發展的今日，無論是電信業者或電腦網路中整體應用系統所涵蓋之部分，包括多媒體編碼，網路傳輸協定，同儕式平台架構，服務品質控制等方面，皆有許多最佳化問題亟待解決與處理。而最佳化技術的本身，更是現實世界中非常重要的課題，各種研究、工程領域中相當多的困難與問題，最終都需要仰賴最佳化技術來進行處理。因此本兩年期計畫的目標，即奠基於本實驗室所發展的泛用型最佳化架構，將之應用於各種數值型態問題 (例如：整數型問題、實數型問題、混合型問題… 等)。並針對無線傳輸控制、網路服務品質機制中各項最佳化問題加以量身訂製，建立適應性函數的數學模型、處理與解決，以促進無線網路傳輸技術之發展與進步。在此研究中，亦將藉由實驗結果來調校泛用型最佳化工具之設定，使整體架構與效能表現更趨於穩定。計畫第一年以LT 編碼 (LT code) 的編碼密度的機率模型 (Degree distribution) 為最佳化的問題標的。在此問題中，藉由設定不同的最佳化參數型別與個數來觀察泛用型最佳化演算法之行為，並進行分析與研究，逐步地改進最佳化演算法之性能。在完成最佳化演算架構之調校後，本計畫第二年再以無線網路傳輸系統中其他三種最佳化問題為目標，進行最佳化實驗，最後將各項參數結果加以整合，並實作於無線網路平台，加強無線傳輸之性能。
異質網路環境之行動搜尋關鍵技術---子計畫一：車用隨意網路存取控制與連結機制之研究
(2010)
簡榮宏
;
JAN RONG-HONG
;
國立交通大學資訊工程學系（所）
隨著無線通訊網路技術的進步，加上電子元件價格漸漸下降以及行車安全問題越來越受重視，各國政府紛紛投入智慧型運輸系統(Intelligent Transport Systems, ITS)的研究。車用隨意網路(Vehicle Ad-hoc Network, VANET)，為當前了為實現ITS所發展出的重要網路架構。在個架構下，每一個搭載無線通訊設備的車輛，都可以透過路旁的路側系統(Road Side Unit, RSU) 連線到Server 端索取所需的資訊。而當車輛距離基地台太遠超出傳訊範圍時，也可透過其它的車輛幫忙轉送。換句話說，每一個車輛都可視為是一部行動無線路由器(mobile wireless router)。因此，這樣的架構可大幅提升網路建置彈性，只要有車輛的地方，即可是VANET的涵蓋範圍。子計畫一的主要研究目標在於發展VANET網路之存取控制協定(Media Access Control, MAC)及連結機制(Connectivity Support)。分為三個階段:在第一年的計畫中，先針對網路低層的MAC進行設計，我們將基於未來最有可能被廣泛使用的專用短距離通通訊(Dedicated Short Range Communication , DSRC)標準進行發展，以合乎趨勢的走向。接下來，在第二年的研究裡，我們將為高速移動的車輛設計以有效的叢集化及功率指定方法，以減少網路干擾，進而提升流量產出及管理上的效果。基於這些低層的技術及規劃方法後，最後一年，我們將發展上層的路由及配送方法，以可克服VANET網路因高度移動和短距離傳輸所造成間歇性連結特性及其衍伸的延遲問題，達到可靠傳輸的最終目標。總括而言，我們將在三年中階段逐步完成下列三大主題:
台灣學生網路相關著作權、學術寫作倫理課程之發展與評量研究---台灣學生網路相關著作權、學術寫作倫理課程之發展與評量研究
(2010)
周倩
;
CHOU CHIEN
;
國立交通大學教育研究所
台灣學生網路相關著作權、學術寫作倫理課程之發展與評量研究中文摘要本研究群擬提出三年期計畫，分為二個面向進行。第一個面向是超越著作權的範疇，針對學術寫作倫理—不抄襲、不剽竊，為各級學生—從小學高年級到大學—具體設計與發展有關網路著作權、學術寫作倫理的課程，並進行教學實驗，透過教育管道教導學生正確的網路相關著作權、學術寫作倫理、改寫與引用方式。課程的設計將築基於傳播學理論「慎思可能性模式」（Elaboration Likelihood Model, ELM），並採用「案例教學法」、「概念卡通」，以及「雙層次測驗」來進行。本研究之第二個重要面向，將特別針對學生網路著作權概念與英文寫作剽竊之觀念、態度、行為等面向，進行深度探討，藉以釐清學生英文寫作剽竊的行為（特別是文句抄襲的現象）與其對於著作權之觀念與行為間，是否有相互關聯性。另外，本計畫也試著把學生將網路資源成為寫作剽竊的「抄襲資源」，轉化為寫作的「學習資源」。透過網路引導學生如何找尋語言的參考資訊，並透過改寫（paraphrasing）過程，轉化為自己的文字，並進而增強學生的英文寫作能力。
薄膜熱傳導性質量測及其應用之研究
(2010)
謝宗雍
;
HSIEH TSUNG-EONG
;
國立交通大學材料科學與工程學系（所）
A chronology of Paik Nak‐chung
(Routledge, 2010)
Groundwater fluctuations in heterogeneous coastal leaky aquifer systems
(2010)
Chuang, M. -H.
;
Huang, C. -S.
;
Li, G. -H.
;
Yeh, H. -D.
;
環境工程研究所
In the past, the coastal leaky aquifer system, including two aquifers and an aquitard between them, was commonly assumed to be homogeneous and of infinite extent in the horizontal direction. The leaky aquifer system may however be heterogeneous and of finite extent due to variations in depositional and post depositional processes. In this paper, the leaky aquifer system is divided into several horizontal regions for the heterogeneous aquitard and underlying aquifer. A one-dimensional analytical model is developed for describing the head fluctuation in such a heterogeneous leaky aquifer system. The hydraulic head of the upper unconfined aquifer is assumed constant. It is found that both the length and location of the discontinuous aquitards presented in the coastal area have significant effects on the amplitude and phase shift of the head fluctuation in the lower aquifer. In addition, the influence of the formation heterogeneity on the spatial head distribution is also investigated.
Combining Reputation and Content-Based Filtering for Blog Article Recommendation in Social Bookmarking Websites
(2010)
Peng, Chi-Chieh
;
Liu, Duen-Ren
;
資訊管理與財務金融系註：原資管所+財金所
;
Department of Information Management and Finance
The new generation of web-based communities, Web2.0, represents an innovative spirit in sharing and managing contents. Social bookmarking is a portal for users to share, organize, search, and manage bookmarks of web resources. However, with the rapid growth of web documents that are produced every day, people are facing the problem of information overload. The Social bookmarking web site provides the push (user recommendation) counts of articles indicating the recommended popularity degrees of articles. In this paper, we propose to derive the popularity degree of an article by considering the reputation of users that push the article. Moreover, we propose a personalized blog article recommendation approach, which combines the reputation-based popularity with content based filtering, to recommend popular blog articles to users that satisfy their personal preferences. Our experimental results show that the proposed approach outperforms conventional approaches.