Browsing by Issue Date, starting with "2012-01-01"

Now showing 1 - 20 of 39426

Traffic-based DRX Cycles Adjustment Scheme for 3GPP LTE Systems
(2012)
Yu, Yu-Ping
;
Feng, Kai-Ten
;
電機工程學系
;
Department of Electrical and Computer Engineering
The 3GPP long term evolution (LTE) standard is developed to enhance mobile services from the former 3G systems. In order to prolong the battery life of mobile device, a novel discontinuous reception (DRX) scheme is specified in the standard to reduce the power consumption of a user equipment. In this paper, a traffic-based DRX cycles adjustment (TDCA) scheme is proposed to enhance the energy saving performance based on existing DRX operation. A partially observable Markov decision process (POMDP) is employed to conjecture the present traffic status. Optimal policy for the selection of DRX parameters can be obtained via the POMDP framework in the proposed TDCA scheme. Simulation results show that the TDCA scheme can enhance the energy saving efficiency while the quality-of-service constraint is still satisfied.
歐盟氣候變遷政策的規範、策略與實踐
(2012)
洪德欽
;
Horng, Der-chin
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科技法律研究所
;
Institute of Technology Law
Safety Management in a Relationship-Oriented Culture
(2012)
Hsu, Shang Hwa
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Lee, Chun-Chia
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工業工程與管理學系
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Department of Industrial Engineering and Management
A relationship-oriented culture predominates in the Greater China region, where it is more important than in Western countries. Some characteristics of this culture influence strongly the organizational structure and interactions among members in an organization. This study aimed to explore the possible influence of relationships on safety management in relationship-oriented cultures. We hypothesized that organizational factors (management involvement and harmonious relationships) within a relationship-oriented culture would influence supervisory work (ongoing monitoring and task instructions), the reporting system (selective reporting), and teamwork (team communication and co-ordination) in safety management at a group level, which would in turn influence individual reliance complacency, risk awareness, and practices. We distributed a safety climate questionnaire to the employees of Taiwanese high-risk industries. The results of structural equation modeling supported the hypothesis. This article also discusses the findings and implications for safety improvement in countries with a relationship-oriented culture.
大學生直銷面面觀
(2012-01-01)
顏伊婷
;
Department of Communication and Technology
;
傳播與科技學系
直銷業走入校園早已不是新鮮事，近年更是愈來愈多大學生成為「多層次傳銷」事業下的生力軍。對經營直銷的大學生而言，究竟又是什麼因素吸引他們加入直銷的行列呢？
赴美免簽　省錢又省時
(2012-01-01)
蘇冠心
;
Department of Communication and Technology
;
傳播與科技學系
美國在台協會（AIT）在2011年12月22日宣布將台灣納入免簽證計畫候選國，預估明年下半年可正式獲得免美簽，未來國人赴美不再需要繁複的簽證申請程序，省錢又省時。
High throughput concurrent lookahead adaptive decision feedback equaliser
(2012-01-01)
Lin, Y. -C.
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Jou, S. -J.
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Shiue, M. -T.
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電子工程學系及電子研究所
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Department of Electronics Engineering and Institute of Electronics
A time-domain adaptive decision feedback equaliser (ADFE) for multi-gigabit wire-line 2-pulse amplitude modulation (PAM) communication systems is proposed. The throughput rate of a conventional ADFE is limited by the loops in the circuit. This investigation develops two methods for breaking or virtually breaking these loops. The first is the method of batch mode coefficient updating (BMCU), and the second is the concurrent lookahead (CLA) method. Since the loops are broken or virtually broken, a pipeline and/or a parallel method can be applied to design a throughput-rate-unlimited ADFE. The results of a simulation of the 10GBASE-S system reveal that the proposed BMCU-based CLA ADFE has the same average signal-to-noise ratio (SNR) as the original sequential ADFE for multi-mode fibres of length 30-90 m.
高負載驅動裝置
(2012-01-01)
莊景德
;
盧建宇
本發明係揭露一種高負載驅動裝置，包含一反向器，用來接收一數位電壓，並將其反向後輸出，此反向器之輸出端連接一電容、一第一、第二P型場效電晶體、一第一、第三N型場效電晶體，且上述電晶體與一第二N型場效電晶體係組成一推動電路，以與一推動P型場效電晶體連接，負載透過推動P型場效電晶體連接一高電壓。當數位電壓從低準位提升至高準位時，推動電路利用電容之原來電壓降，將推動P型場效電晶體之閘極電壓控制在比接地電壓更低之低穩定電壓，以快速驅動負載。本發明可提升對於高負載的切換速度，並降低延遲時間及提升效能。
異質雙群組之效用規模分析
(2012)
謝國文
;
Shieh Gwowen
;
國立交通大學管理科學系（所）
期刊論文發表準則強調在實證資料分析中，應使用效果規模和其區間估計進行重要數據的討論，為了增進社會科學理論和實務發展，本研究探討雙群組之標準化平均差的區間估計法，目的在於改進現有方法在理論和計算兩方面的複雜性，提供具備簡明原理和運算的信賴區間。由於事先規劃研究設計需要，同時也考慮符合精確度要求的樣本數計算法，而精確度可分為期望區間寬度和區間寬度涵蓋率。
Capacity Results of an Optical Intensity Channel With Input-Dependent Gaussian Noise
(2012-01-01)
Moser, Stefan M.
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電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
This paper investigates a channel model describing optical communication based on intensity modulation. It is assumed that the main distortion is caused by additive Gaussian noise, however, with a noise variance depending on the current signal strength. Both the high-power and low-power asymptotic capacities under simultaneously both a peak-power and an average-power constraint are derived. The high-power results are based on a new firm (nonasymptotic) lower bound and a new asymptotic upper bound. The upper bound relies on a dual expression for channel capacity and the notion of capacity-achieving input distributions that escape to infinity. The lower bound is based on a new lower bound on the differential entropy of the channel output in terms of the differential entropy of the channel input. The low-power results make use of a theorem by Prelov and van der Meulen.
E-LEARNING - BEST PRACTICE IN PHOTOGRAMMETRY, REMOTE SENSING AND GIS - STATUS AND CHALLENGES
(2012-01-01)
Koenig, Gerhard
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Shih, Peter T. Y.
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Katterfeld, Christiane
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土木工程學系
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Department of Civil Engineering
In addition to professional training, computer aided teaching has long tradition. The difficult economic situation, however, forced many customers to take drastic austerity measures in the field of learning. Cost pressure encouraged a new openness to innovative and tailored learning concepts. As a result e-learning gained more interest and importance promising great benefit to the user. Around the world a variety of well-designed e-learning products exist. The web pages of Commission VI/2 (http://www.igg.tuberlin.de/ISPRS/) provide a decision aid to locate relevant material. Links to websites known to the authors are listed; a search function allows selective access, taking account of quality criteria. This article describes best practice e-learning applications in photogrammetry, remote sensing and GIS. The rating is based on results of the Computer Assisted Teaching CONtest (CATCON) initiated by ISPRS, and on observation of recent developments.
Using SEM to Analyze Complex Survey Data: A Comparison between Design-Based Single-Level and Model-Based Multilevel Approaches
(2012)
Wu, Jiun-Yu
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Kwok, Oi-man
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教育研究所
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Institute of Education
Both ad-hoc robust sandwich standard error estimators (design-based approach) and multilevel analysis (model-based approach) are commonly used for analyzing complex survey data with nonindependent observations. Although these 2 approaches perform equally well on analyzing complex survey data with equal between-and within-level model structures (B. O. Muthen & Satorra, 1995), the performances of these 2 approaches for analyzing multilevel data with unequal between-and within-level structures have not yet been systematically examined. In this study, we extended B. O. Muthen and Satorra's (1995) study by comparing these 2 approaches and an additional model-based maximum model for analyzing multilevel data considering number of clusters, cluster size, intraclass correlation, and the equality of different level structures. The simulation results showed the model-based maximum model generally performed well across conditions. This model is also recommended as an alternative for analyzing nonindependent survey data, especially when the information of the higher level model structure is not known.
軍用射頻關鍵元組件技術研究
(2012)
張翼
;
CHANG EDWARD YI
;
國立交通大學材料科學與工程學系（所）
本計劃之主要研究為發展「主動相位陣列雷達」所需之高頻、高功率、高線性度及高效率的氮化鎵(GaN)高電子遷移率電晶體，首先將磊晶技術、元件製程、及散熱封裝等方向做整合性研發，以建立完整且系統化之氮化鎵射頻高功率元件之關鍵技術。研究方法為首先以有機金屬氣相沉積設備(MOCVD)磊晶技術，在具高熱傳特性之碳化矽基板(SiC)上磊晶三族氮化物，並研發出調控碳化矽基板與磊晶三族氮化物間晶格不匹配(lattice mismatch)與熱膨脹系數匹配等問題，成長符合軍用射頻之高輸出功率密度放大器之磊晶結構，預期目標可達到電子遷移率大於1800 cm2/Vs及載子密度達1×1013cm-2。接著開發先進之氮化鎵高載子遷移率電晶體(HEMT)製程技術，結合背晶貫孔技術之開發，製作出穩定高性能之GaN HEMT高功率元件，並佐以DC及RF量測系統做元件之分析驗證，預期在X-band下操作，元件之功率密度可達5W/mm。此外亦將進行氮化鎵之HEMT高功率密度輸出元件其散熱封裝之模擬與設計，開發高散熱性氮化鎵/氮化鋁鎵HEMT on SiC高電子遷移率射頻功率元件製程技術。
Power scale-up of high-pulse-energy passively Q-switched Nd:YLF laser: influence of negative thermal lens enhanced by upconversion
(2012)
Huang, Y. J.
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Tang, C. Y.
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Huang, Y. P.
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Huang, S. C.
;
Su, K. W.
"We develop a practical method to extend the power scale-up for a laser in a concave-plano cavity to be influenced by a large negative thermal lens. With the developed method, we successfully scale up the output power of a compact high-pulse-energy passively Q-switched Nd:YLF laser at 1053 nm with the Cr4+:YAG crystal as a saturable absorber. At an incident pump power of 12.6 W, the maximum output power under the optimum operation at 1053 nm reaches 2.61 W with a pulse width of 6 ns and a pulse repetition rate of 4.6 kHz. More importantly, we experimentally verify that the energy-transfer upconversion significantly enhances the negative focal length of thermal lens in the passively Q-switched Nd:YLF laser. (C) 2012 by Astro, Ltd."
奈米CMOS模型研發以探討應力工程與佈局效應對於高頻特性與寬頻雜訊之影響(I)
(2012)
郭治群
;
Guo Jyh-Chyurn
;
國立交通大學電子工程學系及電子研究所
隨著 CMOS 技術之神速發展進入奈米領域，其中由材料與製程產生的應力，無論是天然內在的或者應力工程產生的，均與元件平面佈局和立體結構有密切關聯。STI 製程產生之應力乃是內在的。至於應力工程則包括壓縮型之e-SiGe 加諸於pMOS、伸張型之CESL 加於nMOS、或者壓縮/伸張型之應力內襯膜分別應用於nMOS/pMOS，其目的乃是提升mobility。上述各種應力雖來源不同，但是對於佈局之敏感性乃是共通的。並且所有應力均會對奈米元件之特性產生顯著影響，不限於mobility、電流、gate 速度，乃擴及高頻特性與寬頻雜訊。然而針對此議題，無論是實驗數據或者機制理論皆呈現諸多衝突與矛盾。根據審慎評估，其中不一致性可能大多來自量測方法潛在之問題與先天之限制，此問題對於奈米元件更加嚴重。現有大家熟知常用之電性量測方法均存在諸多缺陷與限制，例如探針、連線與矽基板等之寄生效應而產生之損耗，包括低頻時之電阻式損耗與高頻操作時之電容電感耦合效應等。此外，超薄之閘極介電層因量子穿隧效應產生之漏電流導致傳統之C-V 與CP 量測方法出現重大問題。總合上述各類問題與缺陷，如何精確地萃取奈米元件之本質參數，如Lg、Leff、Weff、Tox(inv)、 Cox(inv) 與 Qinv，乃成為一極具挑戰性之研究課題。更重要的是，這些元件本質參數乃直接決定了關鍵性功能參數，如μeff、gm、fT、fmax 以及雜訊如NFmin 與Sid。前述之困難乃增加了奈米元件模型建立與模擬方面之挑戰，尤其是高頻與低雜訊之設計面臨之難題。本三年期計畫之第一期乃針對此課題，將建立一創新之奈米元件量測分析方法，其中包含新的測試結構、高頻S-參數量測與改進之去寄生效應方法，以及三維連線模擬等等。｢動態基極偏壓｣方法已被證實可有效達到低電壓與低功耗。本計畫擬應用此方法以達到低電壓並提升mobility 與電流之目的。前述之應力工程與此｢動態基極偏壓｣法均可提升mobility，但是對於雜訊之影響可能大異其趣。其主要差異源自改變mobility 之物理機制不同。應力工程對mobility 之調變是藉著晶格不匹配產生之扭曲與能帶結構改變，然而｢動態基極偏壓｣乃是受益於較低之等效電場而減少載子表面碰撞以提升其mobility。因此本計畫擬致力於探討此兩種方法對於mobility、高頻特性與低頻雜訊之影響，包括flicker noise 與random telegraph noise (RTN)。其中包含四埠測試結構設計、元件量測分析與參數萃取等等。本計畫之第二期有三個重點主題 (1) 低頻雜訊模型之改進，加入元件佈局效應(2) BSIM-4 模型之改進，加入佈局效應相關之雜訊模型以及｢動態基極偏壓｣效應，以期適用於四埠元件模擬(3) 四埠元件之小訊號等效電路模型建立以應用於使用｢動態基極偏壓｣之高頻電路模擬。雙閘極 MOSFET 乃是一新式的cascode 結構，實際為單一元件佈局而具有二個獨立的閘極以提供個別之電壓，其中雙閘極分別控制之二個電晶體乃共有源極與汲極以減少面積。此結構中之共有源/汲極區域稱為inter-stage 乃處於懸浮態無任何接觸窗與連線，因此呈現有趣的佈局效應，對於I-V、C-V 與高頻特性均有極大影響，因此列為本計畫之第三期研究主題。其中主要挑戰包括如何決定源自inter-stage 的閘極電容、接面電容與串聯電阻，因其乃處於懸浮態而無法直接量測。此雙閘極MOSFET 實際結構上為5 端元件，因此四埠測試是必要的，但是不足以得到所有的元件參數，預期必需加入另一四埠測試結構稱為common-gate MOSFET，以期解決此難題。本計畫之第三期研究擬完成之工作為(1) 雙閘極MOSFET 之小訊號等效電路模型建立以應用於使用此新式cascode 之高頻電路模擬 (2) BSIM-4 模型之改進，加入雙閘極MOSFET 元件模型參數，以期適用於新式cascode 模擬(3) 射頻電路設計包括LNA 與 mixer，以比較新式cascode 與傳統cascode 之差異與優缺點。總之，本三年期計畫涵蓋之研究主題深具挑戰性，並且兼具學術研究與實用價值。本計畫擬達成之目標與成果，有助於提升奈米CMOS 射頻與類比電路設計之效能。
How to increase supplier flexibility through social mechanisms and influence strategies?
(2012)
Chu, Po-Young
;
Chang, Kuo-Hsiung
;
Huang, Hsu-Feng
;
管理科學系
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Department of Management Science
Purpose-This study aims to examine the means by which influence strategies and social mechanisms (trust and shared vision) influence the flexibility of suppliers, and its ultimate effect on the performance of manufacturers. Design/methodology/approach-This study bases the major components of marketing research on previous studies related to influence strategies and flexibility in the supply-chain. This empirical study utilized 162 SMIT survey samples. Findings-Results show that using coercive influence strategies and developing a shared vision promote supplier flexibility and fully mediate the effects of trust on supplier flexibility. In addition, supplier flexibility has a significant positive impact on the performance of manufacturers. Research limitations/implications-The perceptions of manufacturers regarding influence strategies and social mechanisms formed the basis of this study. Future studies could focus on the reciprocal strategies of suppliers, and the influence of these actions on the effectiveness of the influence strategies employed by manufacturers. Practical implications-This paper adds to the existing management guidelines addressing the problem of ensuring increased flexibility from suppliers to enable a more rapid response to the demands of customers to enhance performance. Originality/value-The paper provides novel insights into the impact of influence strategies and social mechanisms on the flexibility of suppliers.
An Efficient Fragile Watermarking Scheme for Pixel-wise Tamper Detection
(2012)
Lee, Yang-Kuo
;
Chang, Jen-Chun
;
Wu, Hsin-Lung
;
Chen, Rong-Jaye
;
資訊工程學系
In this paper we propose a novel pixel-wise fragile watermarking scheme which is able to detect tampered pixels with very high probability. Based on a new technique called Image-Dependent Seed (IDS), the proposed method is not only efficient but also secure against many known attacks. Furthermore, the proposed scheme can be simply implemented with only bit-wise AND and Exclusive-OR operations.
A New Procedure to Extract Ultra-Low Specific Contact Resistivity
(2012)
Tseng, Hsuan-Tzu
;
Tsui, Bing-Yue
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
In this work, a new procedure to extract ultra-low specific contact resistivity down to 10(-9) Omega-cm(2) is proposed. Design guidelines of the test structure are analyzed with 3-D simulation. Compared to the typical Cross-bridge-Kelvin resistor structure, the proposed structure has much better accuracy at low resistivity regime, looser design rules, simpler fabrication process.
An Integrated MCDM Model for Glamour Stock Selection
(2012-01-01)
Shen, Kao-Yi
;
Chen, Vivien Y. C.
;
Tzeng, Gwo-Hshiung
;
科技管理研究所
;
Institute of Management of Technology
Stock market is full of opportunity and uncertainty, which is characterized by return and risk. Investors have to utilize their knowledge and experience to explore the available information for selecting stocks with good prospects. Investment professionals mainly utilize available financial information for making evaluation, which is often termed as fundamental analysis. Nevertheless, which financial information (variables/criteria) should be considered and the way for analysis is still inconclusive. Furthermore, while making comparison among a group of stocks, different criteria sometime reveal inconsistent signals. To handle the complexity of financial information analysis, this study proposes an integrated method to deal with the glamour stock evaluation problem. The method is based on an examined financial model. In the first stage, the weights of criteria are obtained by DANP method, and the second stage integrates the influential weights with expert's assessment for each criterion to complete the modified TOPSIS based on influential network relation map (INRM) for making decision in improvement direction. This study provides an empirical case for 5 real stocks in the Taiwan market as example. The suggested ranking result generated high correlation with the 5 stocks' subsequent holding period returns, which indicates the usefulness of the proposed method.
大學部邀請卡正面
(2012)
Office of Student Affairs
;
學生事務處
國立交通大學101學年度畢業典禮；INVITATION We are proud of BIG NCTU；國立交通大學100學年度大學部畢業典禮；BIG NCTU；Brilliance；Innovation；Green
SPECTRO-TEMPORAL SUBBAND WIENER FILTER FOR SPEECH ENHANCEMENT
(2012)
Hsu, Chung-Chien
;
Lin, Tse-En
;
Chen, Jian-Hueng
;
Chi, Tai-Shih
;
電子工程學系及電子研究所
In this paper, we propose a signal-channel speech enhancement algorithm by applying the conventional Wiener filter in the spectro-temporal modulation domain. The multi-resolution spectro-temporal analysis and synthesis framework for Fourier spectrograms [12] is extended to the analysis-modification-synthesis (AMS) framework for speech enhancement. Compared with conventional speech enhancement algorithms, a Wiener filter and an extended minimum mean-square error (MMSE) algorithm, our proposed method outperforms them by a large/small margin in white/babble noise conditions from both objective and subjective evaluations.