Browsing by Issue Date, starting with "2007-10-15"

Now showing 1 - 20 of 58885

Synthesis and characterization of liquid crystalline side-chain block copolymers containing luminescent 4,4'-bis(biphenyl)fluorene pendants
(2007-10-15)
Lee, Kuan-Wei
;
Lin, Hong-Cheu
;
材料科學與工程學系
;
Department of Materials Science and Engineering
A series of new liquid crystalline homopolymers, copolymers, and block copolymers were polymerized from styrene-macroinitiator (SMi) and methacrylates with pendent 4,4'-bis(biphenyl)fluorene (M1) and biphenyl-4-ylfluorene (M2) groups through atom transfer radical polymerization (ATRP). The number-average molecular weights (Mn) of polymers P1-P4 were 10,007, 14,852, 6,275, and 10,463 g mol-1 with polydispersity indices values of 1.21, 1.15, 1.31, and 1.22, respectively. All polymers exhibit the nematic phase. The thermal, mesogenic, and photoluminescent properties of all polymers were investigated. (c) 2007 Wiley Periodicals, Inc.
On the fairness and complexity of generalized k-in-a-row games
(2007-10-15)
Hsieh, Ming Yu
;
Tsai, Shi-Chun
;
資訊工程學系
;
Department of Computer Science
Recently, Wu and Huang [I.-C. Wu, D.-Y Huang, A new family of k-in-a-row games, in: The 11th Advances in Computer Games Conference, ACG' 1, Taipei, Taiwan, September 2005] introduced a new game called Connect6, where two players, Black and White, alternately place two stones of their own color, black and white respectively, on an empty Go-like board, except for that Black (the first player) places one stone only for the first move. The one who gets six consecutive (horizontally, vertically or diagonally) stones of his color first wins the game. Unlike Go-Moku, Connect6 appears to be fairer and has been adopted as an official competition event in Computer Olympiad 2006. Connect(m, n, k, p, q) is a generalized family of k-in-a-row games, where two players place p stones on an m x n board alternatively, except Black places q stones in the first move. The one who first gets his stones k-consecutive in a line (horizontally, vertically or diagonally) wins. Connect6 is simply the game of Connect(m, n, 6, 2, 1). In this paper, we study two interesting issues of Connect(m, n, k, p, q): fairness and complexity. First, we prove that no one has a winning strategy in Connect(m, n, k, p, q) starting from an empty board when k >= 4p + 7 and p >= q. Second, we prove that, for any fixed constants k, p such that k - p >= max{3, p} and a given Connect(m, n, k, p, q) position, it is PSPACE-complete to determine whether the first player has a winning strategy. Consequently, this implies that Connect6 played on an m x n board (i.e., Connect(m, n, 6, 2, 1)) is PSPACE-complete. (c) 2007 Elsevier B.V. All rights reserved.
Terahertz spectroscopic study of vertically aligned InN nanorods
(2007-10-15)
Ahn, H.
;
Ku, Y.-P.
;
Wang, Y.-C.
;
Chuang, C.-H.
;
Gwo, S.
Terahertz time-domain spectroscopy has been used to investigate terahertz conductivity and dielectric response of indium nitride (InN) nanorod array and epitaxial film. The complex terahertz conductivity of InN film is well fitted by the Drude model, while the negative imaginary conductivity of the InN nanorods can be described by using the Drude-Smith model. The electron mobility of the InN film is 1217 +/- 58 cm(2)/V s, while that of the InN nanorods is 80 +/- 5 cm(2)/V s. The reduced mobility of carriers for the latter can be attributed to the restricted carrier transport within the nanorods. (C) 2007 American Institute of Physics.
Using event detection latency to evaluate the coverage of a wireless sensor network
(2007-10-15)
Wang, You-Chiun
;
Cheng, Kai-Yang
;
Tseng, Yu-Chee
;
資訊工程學系
;
Department of Computer Science
A wireless sensor network (WSN) consists of many tiny and low-power devices deployed in a sensing field. One of the major tasks of a WSN is to monitor the surrounding environment and to detect events occurring in the sensing field. Given an event appearing in a WSN, the event detection latency is to model the time that it takes for the WSN to be aware of the event. In this work, we analyze the latency using a probabilistic approach under an any-sensor-detection and a k-sensor-detection models, where k > 1 is an integer. Such an analysis can be used as an index to evaluate a WSN's coverage and thus can help guide the deployment of a WSN. We also develop simulations to verify our analytical results. (C) 2007 Elsevier B.V. All rights reserved.
Topographic control on silicone surface using chemical oxidization method
(2007-10-15)
Shih, Teng-Kai
;
Ho, Jeng-Rong
;
Chen, Chia-Fu
;
Whang, Wha-Tzong
;
Chen, Chien-Chung
The paper describes a wet process for modifying the surface of polydimethylsiloxane (PDMS) using H2SO4/HNO3 solutions. The oxidation on the surface of PDMS was confirmed by the examinations of Fourier transform infrared spectrometry (FTIR), contact angle of water drop and X-ray photoelectron spectroscopy (XPS). The hydrophobic surface of pristine PDMS was not only changed to hydrophilic, but also formed wrinkles on it after chemical modification. Bilayer systems, stiff oxidized PDMS layers were capped on soft PDMS foundations, would generate easily compressive stresses due to the large difference in volumetric contraction rates and led to form wrinkles on the surface. Experimental results demonstrated the periodicity of wrinkles was controllable by controlling the duration of oxidation. Therefore, wrinkles could be arranged orderly by the guidance of external forces before oxidization. The potential technology for generating and ordering wrinkles on the PDMS surface is valuable in the applications of pressure sensors, biology, micro-optics and nano-/micro-fabrication in the future. (C) 2007 Elsevier B.V. All rights reserved.
Discrete-dopant-induced characteristic fluctuations in 16 nm multiple-gate silicon-on-insulator devices
(2007-10-15)
Li, Yiming
;
Hwang, Chih-Hong
;
電信工程研究所
;
Institute of Communications Engineering
The impact of the number and position of discrete dopants on device characteristics is crucial in determining the behavior of nanoscale semiconductor devices. This study explores discrete-dopant-induced characteristic fluctuations in 16 nm single-, double-, triple-, and (square shape) surrounding-gate silicon-on-insulator (SOI) devices. Discrete dopants are statistically positioned in the three-dimensional channel region to examine associated carrier transportation characteristics, concurrently capturing "dopant concentration variation" and "dopant position fluctuation." An experimentally validated simulation was conducted to investigate the threshold voltage (V-th) fluctuation and the variation of the on- and off-state currents of the four explored structures. The fluctuations of V-th of the double-, triple- and surrounding-gate devices are 2.2, 3.3 and 4 times smaller, respectively, than that of planar SOI. Results of this study provide further insight into the problem of fluctuation and the mechanism of immunity against fluctuation in ultrasmall field effect transistors (FETs) with vertical channel structures, such as fin-typed FETs. (C) 2007 American Institute of Physics.
Absorption spectra in the vacuum ultraviolet region of methanol in condensed phases
(2007-10-15)
Kuo, Yu-Ping
;
Lu, Hsiao-Chi
;
Wu, Yu-Jong
;
Cheng, Bing-Ming
;
Ogilvie, J. F.
With radiation from a synchrotron we measured the spectra of pure solid methanol and of methanol dispersed in solid argon (molar ratio 200) and krypton (molar ratio 250) at 10 K from the onset of absorption in the vacuum ultraviolet region until the limits imposed by LiF windows or the Ar or Kr dispersant. We fitted the total absorption profile divided by wavenumber to gaussian curves of minimal number. and made tentative assignments of electronic transitions and vibrational structure by comparison with spectra of gaseous methanol and with energies and intensities from our published quantum-chemical calculations. (C) 2007 Elsevier B.V. All rights reserved.
Liquid crystal enabled multi-channel power equalizer and stabilizer
(2007-10-15)
Pan, Ru-Pin
;
Sheu, Chia-Rong
;
Lan, Yu-Ping
;
Lai, Yi-Fan
;
Pan, Ci-Ling
Automatic power equalization and stabilization of a liquid crystal enabled channel-selectable optical demultiplexer is demonstrated. The variation among output signals from different channels was reduced from similar to 10 dB to 0.15 dB with feedback control. The minimum ripple level of a single channel is similar to 0.05 dB. As a variable optical attenuator (VOA), the attenuation range of the device is similar to 12.6 dB. (c) 2007 Elsevier B.V. All rights reserved.
傳輸控制協定連線接合裝置與方法
(2007-10-16)
陳耀宗
;
劉榮智
本發明為傳輸控制協定連線接合裝置與方法,利用本發明之接合裝置接合兩使用端各自之傳輸控制協定連線,其接合方式係採用三段式交握協定,接合完成後,一使用端傳遞資料封包至另一使用端,只須經接合裝置更改資料封包之IP位址及更新其檢查總合即可轉傳至另一使用端,並不須記錄其傳輸層序號及傳輸層回覆序號,使接合裝置不需維護兩使用端各自之傳輸控制協定連線的壅塞控制與流量控制,有效達到提升轉傳效率以及降低網路延遲。本發明之裝置與方法適用於內網互聯、視訊會議、IPv4/IPv6位址傳輸協定及行動式網路通信協定等網路通訊。
Microscopic modeling and control logic for incident-responsive automatic vehicle movements in single-automated-lane highway systems
(2007-10-16)
Sheu, Jiuh-Biing
;
運輸與物流管理系註：原交通所+運管所
;
Department of Transportation and Logistics Management
Automatic response to lane-blocking incidents is a critical issue in the field of automated highway systems (AHS). Accordingly, this paper presents a microscopic vehicular control methodology for automatic-control (AC) vehicular movements in response to lane-blocking incidents in the AHS environment. The embedded traffic control logic is based on the basic safety requirements for automatic-control lane traffic maneuvers responding to lane-blocking incidents in the single-automated-lane AHS environment. Accordingly, respective automated vehicular control models are proposed to deal with AC vehicles moving in three corresponding sequential phases, i.e., (1) AC platoon approaching the incident site from the blocked lane, (2) mandatory lane changing and mixed car following in the adjacent lane, and (3) AC platoon reforming downstream from the incident site in the blocked automated lane. Using a microscopic simulation model which embeds these proposed models, preliminary tests are conducted to investigate the relative performance of the proposed method in various traffic flow and control scenarios. The resulting numerical results, including simplified sensitivity analyses, indicate that the proposed microscopic traffic control logic permits regulating automatic-control vehicular movements in response to the effects of lane-blocking incidents on traffic flows either in control-free lanes or in the automatic-control lanes. Implications of the results and some findings are discussed for further research, (C) 2006 Elsevier B.V. All rights reserved.
表面金屬化聚亞醯胺材料及其製備方法
(2007-10-16)
黃華宗
;
蕭育生
一種表面金屬化聚亞醯胺材料之製備方法,其步驟包含對一聚亞醯胺材料之表面進行一鹼處理,使該聚亞醯胺材料表面開環;對該聚亞醯胺材料之表面進行一離子交換處理,使一第一金屬離子置換於該聚亞醯胺材料之表面,其中該第一金屬離子不包含鈀、金、銀以及銅離子;以及進行一濕式還原處理用以將該聚亞醯胺材料表面之該第一金屬離子還原成第一金屬並附著於該聚亞醯胺材料之表面。同時揭露一種依據上述製備方法製得之表面金屬化聚亞醯胺材料。
具三倍電壓耐受能力之電源線間靜電放電防護電路
(2007-10-16)
柯明道
;
陳穩義
本發明提供一種具三倍電壓耐受能力之電源線間靜電放電防護電路,其中之電路元件可安全操作在電壓準位為三倍元件正常工作電壓之情況下,且不會有閘極氧化層的可靠度問題,並利用一靜電放電偵測電路,在靜電放電發生的情況下,可有效利用基極觸發技術來增進本發明整體之靜電放電防護效能,由於本發明僅利用低壓元件即可達到高壓耐受之目的,故應用於混合電壓輸入/輸出介面電路之晶片上,可節省成本並提供高靜電放電防護能力。
High-voltage tolerant power rail electrostatic discharge clamp circuit
(2007-10-16)
Ker
;
Ming-Dou
;
Chen
;
Wen-Yi
A high-voltage tolerant power-rail ESD clamp circuit is proposed, in which circuit devices can safely operate under the high power supply voltage that is three times larger than their process limitation without gate-oxide reliability issue. Moreover, an ESD detection circuit is used to effectively improve the whole ESD protection function by substrate-triggered technique. Because only low voltage (1*VDD) devices are used to achieve the object of high voltage (3*VDD) tolerance, the proposed design provides a cost effective power-rail ESD protection solution to chips with mixed-voltage interfaces.
Optimal control policy for a standing order inventory system
(2007-10-16)
Chiang, Chi
;
管理科學系
;
Department of Management Science
In this paper, we consider a standing order inventory system in which an order of fixed size arrives in each period. Since demand is stochastic, such a system must allow for procurement of extra units in the case of an emergency and sell-offs of excess inventory. Assuming the average-cost criterion, Rosenshine and Obee (Operations Research 24 (1976) 1143-1155) first studied such a system and devised a 4-parameter inventory control policy that is not generally optimal. The current paper uses dynamic programming to determine the optimal control policy for a standing order system, which consists of only two operational parameters: the dispose-down-to level and order-up-to level. Either the average-cost or discounted-cost criterion can be assumed in the proposed model. Also, both the backlogged and lost-sales problems are investigated in this paper. By using a convergence theorem, we stop the dynamic programming computation and obtain the two optimal parameters. (C) 2006 Elsevier B.V. All rights reserved.
Stabilized dual-wavelength erbium-doped dual-ring fiber laser
(2007-10-17)
Yeh, Chien-Hung
;
光電工程學系
;
Department of Photonics
A stable dual-wavelength erbium-doped fiber (EDF) compound ring laser using a double-ring filter (DRF) is proposed and demonstrated experimentally. By using a ring filter incorporated within the ring cavity, the fiber laser can lase two wavelengths simultaneously. The dualwavelength output exhibits a good performance having the optical sidemode suppression ratios (SMSRs) of 45.3 and 46.3 dB and output powers of -8.1 and -7.1 dBm, respectively. In addition, the optical output stabilities of the ring laser have been also discussed. (c) 2007 Optical Society of America.
画素駆動回路とその駆動方法、及びそれを用いた液晶表示装置
(2007-10-18)
蔡明憲
;
戴亞翔
【課題】より短い走査時間でカラーシリアル駆動を実現し発光効率が高く素子電力消費が低減される画素駆動回路とその駆動方法及び適用を提供する。【解決手段】異なるタイミングにおいて、画素駆動回路は、それぞれ、三つの薄膜トランジスタ２２，３２、３４、を蓄積容量４０と液晶容量４２とのスイッチとし、まず、蓄積容量に対して、十分の電量を充電し、また、液晶容量に対して放電し、最後に、蓄積容量４０と液晶容量との電荷をリセットすることにより、液晶容量に対して、充電する目的を達成する。これにより、本発明の回路設計により、また、適当なタイミング制御に合わせて、カラーシリアル駆動法を利用する表示装置においても、順に列を走査することを停止してバックライトの光源を切り替えることがないため、画素を充電する時間と、発光する時間が、短縮されず、また、表示装置が、より高い周波数でも操作でき、より良い画面品質が得られる。【選択図】図３
廣州樂壇才子　張敬軒《酷愛》
(2007-10-21)
鄧詠兒
;
Department of Communication and Technology
;
傳播與科技學系
廣州男孩到香港發展歌唱事業，備受好評。
Photoabsorption cross sections of NH3, NH2D, NHD2, and ND3 in the spectral range 110-144 nm
(2007-10-21)
Wu, Yu-Jong
;
Lu, Hsiao-Chi
;
Chen, Hong-Kai
;
Cheng, Bing-Ming
;
Lee, Yuan-Pern
Cross sections for photoabsorption of NH3, NH2D, NHD2, and ND3 near 298 K were measured in the spectral range of 110-144 nm using radiation from a synchrotron. Absorption cross sections and oscillator strengths of NH3 agree satisfactorily with previous reports; those of ND3 are improved over those in a previous report, whereas those of NH2D and NHD2 are new. The oscillator strengths of transitions to D, D-', D-'', F, and G states are nearly the same among all four isotopic variants, but those to D-''' and E states vary substantially. Observed absorption bands are arranged into vibrational progressions in accord with known Rydberg transitions. All progressions show a common trend of vibrational intervals increasing with vibrational quantum numbers. The Rydberg orbitals for states D(3de('')), D-'(4sa(1)(')), D-''(3da(1)(')), D-'''(4pe(')), and E(4de('')) are readily assigned with quantum defects determined in these experiments, but assignments for F(5de('')) and G(6de('')) are uncertain. Absorption cross sections of dissociative continua underneath discrete structures are larger for NH2D and NHD2 than for NH3 and ND3, indicating that the rate of dissociation of ammonia might increase when its symmetry is broken. (C) 2007 American Institute of Physics.
芭樂芭樂情歌我最大！
(2007-10-21)
江柏廷
;
Department of Communication and Technology
;
傳播與科技學系
千篇一律愛來愛去的芭樂情歌總是票房保證！？
《藍，或另一種藍》你選對了嗎？
(2007-10-21)
盧沛樺
;
Department of Communication and Technology
;
傳播與科技學系
選擇後，你曾經感到後悔嗎？人彷彿總是不安於室，面對未被選擇的另一方，我們是不是純粹投射太多綺麗幻想呢？