Browsing by Issue Date, starting with "2004-05-18"

Now showing 1 - 20 of 70147

觀賞「德藝百年大展」詩人管管:出神入化!沒話講！
(2004-05-18)
陳希林
Method and apparatus for motion estimation with all binary representation
(2004-05-20)
Jeng-Hung, Luo
;
Gen-Ming, Lee
;
Chung-Neng, Wang
;
Tihao, Chiang
A method of motion estimation for video encoding constructs a binary pyramid structure having three binary layers. A state update module registers and updates repeat occurrence of final motion vectors and a static-state checking module determines if the method is in a static mode or a normal mode based on the repeat occurrence. In a normal mode, the first binary layer is searched within a ±3 pixel refinement window to determine a first level motion vector. In the second binary layer, a search range is computed based on six motion vector candidates. By checking every point within in the search range, a second binary layer search generates a second level motion vector. Finally, a third binary layer search within a ±2 pixel refinement window generates a final motion vector according to the second level motion vector. In a static mode, a fine tuning module performs search within a ±1 pixel refinement window and generates a final motion vector.
Enhancing the thermal and spectral stabilities of polyfluorene-based bluelight-emitting materials by incorporating pendent spiro-cycloalkyl groups
(2004-05-20)
Wu, FI
;
Dodda, R
;
Jakka, K
;
Huang, JH
;
Hsu, CS
We have synthesized polyfluorene-based copolymers containing spiro-cycloalkyl groups functionalized on the C-9 position of alternate fluorene units using the Suzuki coupling reaction. The presence of the rigid spiro-cycloalkyl pendent groups not only hinders the close packing and intermolecular interactions between polymer chains, but also preserves the molecular rigidity of the polymer, leading to polyfluorenes with high glass transition temperatures and improved thermal and spectral stabilities. The results of photoluminescence measurements of the isothermally heated spiro-polyfluorene thin films (150degreesC for 20h) show that the commonly observed aggregate/excimer formation is suppressed effectively in these polymers. Blue electroluminescence was demonstrated in a double-layer LED device using the spiro-derivatized polyfluorene as the emitting layer. (C) 2004 Elsevier Ltd. All rights reserved.
GPRS-based WLAN authentication and auto-configuration
(2004-05-20)
Lin, P
;
Lin, YB
;
Feng, V
;
Lai, YC
;
資訊工程學系
This paper proposes an authentication and auto-configuration mechanism for wireless LAN (WLAN) based on short message service of mobile telecommunications network. Our approach automates the authentication and WLAN configuration setup procedure without involving the users. (C) 2004 Elsevier B.V. All rights reserved.
Anti-HCV activities of selective polyunsaturated fatty acids
(2004-05-21)
Leu, GZ
;
Lin, TY
;
Hsu, JTA
;
生物科技學系
;
Department of Biological Science and Technology
HCV infection can lead to chronic infectious hepatitis disease with serious sequelae. Interferon-alpha, or its PEGylated form, plus ribavirin is the only treatment option to combat HCV. Alternative and more effective therapy is needed due to the severe side effects and unsatisfactory curing rate of the current therapy. In this study, we found that several polyunsaturated fatty acids (PUFAs) including arachidonic acid (AA), docosahexaenoic acid (DHA), and eicosapentaenoic acid (EPA) are able to exert anti-HCV activities using an HCV subgenomic RNA replicon system. The EC50 (50% effective concentration to inhibit HCV replication) of AA was 4 muM that falls in the range of physiologically relevant concentration. At 100 muM, alpha-linolenic acid, gamma-linolenic, and linoleic acid only reduced HCV RNA levels slightly and saturated fatty acids including oleic acid, myristic acid, palmitic acid, and steric acid had no inhibitory activities toward HCV replication. When AA was combined with IFN-alpha, strong synergistic anti-HCV effect was observed as revealed by an isobologram analysis. It will be important to determine whether PUFAs can provide synergistic antiviral effects when given as food supplements during IFN-based anti-HCV therapy. Further elucidation of the exact anti-HCV mechanism caused by AA, DHA, and EPA may lead to the development of agents with potent activity against HCV or related viruses. (C) 2004 Elsevier Inc. All rights reserved.
An analytical solution for vibrations of a polarly orthotropic Mindlin sectorial plate with simply supported radial edges
(2004-05-21)
Huang, CS
;
Ho, KH
;
土木工程學系
;
Department of Civil Engineering
This paper presents the first known analytical solution for vibrations of a polarly orthotropic Mindlin sectorial plate with simply supported radial edges. The solution is a series solution constructed using the Frobenius method and exactly satisfies not only the boundary conditions along the radial and circular edges, but also the regularity conditions at the vertex of the radial edges. The moment and shear force singularities at the vertex are exactly considered in the solution. The correctness of the proposed solution is confirmed by comparing non-dimensional frequencies of isotropic plates obtained from the present solution with published data obtained from a closed-form solution. This paper also investigates the effects of elastic and shear moduli on the vibration frequencies of the sectorial plates with free or fix boundary conditions along the circumferential edge. A study is also carried out about the influence of elastic and shear moduli on the moment and shear force singularities at the plate origin (r = 0) for different vertex angles. (C) 2003 Elsevier Ltd. All rights reserved.
光纖濾波器及光調變器
(2004-05-21)
祁甡
;
曾孝明
;
陳南光
;
蔡馥宇
本案係指一種利用光子晶體製作的光纖濾波器及光調變器，使用光子晶體貼附於側磨光纖元件表面以形成波長可調式光纖濾波器及光調變器。利用光子晶體所形成的光子能隙並藉由光纖消逝場的作用，達到對光纖內部傳導光波長濾波的效果。再使用外部控制的方法，改變光子晶體內孔洞材料的折射率或體積，便可以輕易地移動光子晶體本身的光子能隙，以達到全光纖型波長可調式濾波器的效果；同時，對特定波段而言，亦可製作光纖光強度調變器，特別是針對孔洞材料使用可高速調變的電光效應高分子聚合物，可用來製作高速光強度調變器。五.(一)本案代表圖為：第二圖。 (二)本案代表圖之元件符號說明：光纖1 光子晶體2 消逝場裸露面11 光芯12 孔洞21 高分子聚合物22
Competition between the charge ordered and ferromagnetic states in (La,Nd)(0.75)Na0.25MnO3 manganites
(2004-05-24)
Li, ZQ
;
Zhang, XH
;
Yu, JS
;
Liu, XJ
;
Liu, XD
Structural, magnetic, and transport properties of (La1-xNdx)(0.75)Na0.25MnO3 (0 less than or equal to x less than or equal to 1) are studied. The system exhibits a rhombohedrally distorted perovskite structure for x less than or equal to 0.2 and it convert to an orthorhombic structure for x greater than or equal to 0.4. Re-entrant ferromagnetic type charge ordering transitions are observed in the narrow bandwidth samples (x greater than or equal to 0.6), while charge ordering transition is not observed for these samples with rhombohedral structure. Combining with the published results related to the charge ordering transition, we argue that the rhombohedral structure likely favor double exchange interaction and suppress charge ordering interaction. The compounds show metal to insulator transitions except Nd0.75Na0.25MnO3. The resistivity data above the metal to insulator transition temperature for the charge ordered sample are discussed in the frame work of variable-range hopping model. (C) 2004 Elsevier B.V. All rights reserved.
EFBLA: a two-phase matching algorithm for fast motion estimation
(2004-05-27)
Cheng, HW
;
Dung, LR
;
電控工程研究所
;
Institute of Electrical and Control Engineering
A novel motion estimation algorithm that contains edge matching and block matching is presented. The edge matching reduces candidates for the block matching that performs accurate searching. Thus, the two-phase procedure speeds up motion estimation. As a result, edge-matching first block-matching last algorithm (EFBLA) may significantly save the computation load by 93.9%.
Resonator-based multi-stage Sigma Delta modulator for wideband applications with improved dynamic range
(2004-05-27)
Chang, TH
;
Dung, LR
;
電控工程研究所
;
Institute of Electrical and Control Engineering
A new design methodology for wideband, multi-stage, multi-bit YEA modulators (SigmaDeltaMs) with improved dynamic range, is presented. The key to improving dynamic range is to have the first stage oscillated, then the coarse quantisation noise vanishes and hence circuit nonlinearities do not cause a leakage quantisation noise problem. Based on the proposed methodology, a fourth-order four-bit SigmaDeltaM can achieve the dynamic range of 80 dB at the OSR of 8 without using additional calibration techniques.
Pev cosmic neutrinos from the mountains
(2004-05-30)
Yeh, P
;
Athar, H
;
La Barbera, N
;
Bouaissi, S
;
Catalano, O
The NuTel collaboration is building a wide field-of-view Cerenkov telescope to be installed on a mountain site for observing near horizontal air showers emerging from another mountain. Cosmic tau neutrinos is the primary source of such showers. This technique will be realized for the first time in the v, energy range of 2 PeV to 1000 PeV. The telescope has enough sensitivity to observe cosmic neutrinos from sources like Active Galactic Nuclei and Galactic Center assuming fluxes from current theoretical models.
Affleck-dine baryogenesis in a string model
(2004-05-30)
Dolgov, AD
;
Kohri, K
;
Seto, O
;
Yokoyama, J
;
物理研究所
Entropy production by a dilaton decay is studied in the model where the dilaton acquires potential via gaugino condensation in the hidden gauge group. Its effect on the Affleck-Dine baryogenesis is investigated. It is shown that the baryon asymmetry produced by this mechanism with the higher-dimensional terms is diluted by the dilaton decay and can be regulated to the observed value.
What do we mean by detecting earth-skimming of neutrinos?
(2004-05-30)
Lin, GL
;
物理研究所
;
Institute of Physics
In this talk, we elaborate the strategy for detecting the Earth-skimming tau neutrinos. We first show that there are non-negligible astrophysical tau neutrino fluxes due to neutrino flavor oscillations. We then illustrate the idea of detecting Earth-skimming tau neutrinos. In particular, we point out that the tau-lepton flux resulting from neutrino-nucleon scatterings inside the earth is controlled by the tau-lepton range. We demonstrate this observation by showing the tau-lepton flux induced by the GZK tau-neutrino flux. The question on the energy resolutions of tau neutrinos in this detection strategy is briefly discussed.
Prediction of the bonding states of cysteines using the support vector machines based on multiple feature vectors and cysteine state sequences
(2004-06-01)
Chen, YC
;
Lin, SC
;
Lin, CJ
;
Hwang, JK
;
生物科技學系
The support vector machine (SVM) method is used to predict the bonding states of cysteines. Besides using local descriptors such as the local sequences, we include global information, such as amino acid compositions and the patterns of the states of cysteines (bonded or nonbonded), or cysteine state sequences, of the proteins. We found that SVM based on local sequences or global amino acid compositions yielded similar prediction accuracies for the data set comprising 4136 cysteine-containing segments extracted from 969 nonhomologous proteins. However, the SVM method based on multiple feature vectors (combining local sequences and global amino acid compositions) significantly improves the prediction accuracy, from 80% to 86%. If coupled with cysteine state sequences, SVM based on multiple feature vectors yields 90% in overall prediction accuracy and a 0.77 Matthews correlation coefficient, around 10% and 22% higher than the corresponding values obtained by SVM based on local sequence information. (C) 2004Wiley-Liss, Inc.
石牌醫訊第３４１期
(國立陽明大學, 2004-06-01)
陽明電子報編輯小組
日　期：2004年5月30日-2004年6月5日時間：93年5月30日（星期日），9:00-4:00 地點：活動中心六樓‧山腰上的家講者：王理書　教育科技與諮商雙碩士（美國堪薩斯州立大學）講題：關係裡的自我映照─深層自我的隱喻、關係與自我的整合 ─神奇隱喻的產生與述說‧整合與治療時間：93年5月31日（星期一）12:00-13:10 地點：實驗大樓3F A101 講者：陳家俊教授（師大化學系）講題：奈米材料之生醫應用時間：93年 5月31日（星期一）12:20-13:20 地點：生化所501教室講者：Professor Brenda Kahan （Department of Biomolecular Chemistry, University of Wisconsin）講題：Derivation of Pancreatic Islet Cells from Embryonic Stem Cells 時間：93年5月31日（星期一）下午3:00 地點：微免所 401室講者：許輝吉　教授 (台大病理所) 講題：Hepatocellular carcinoma: Pathology, molecular pathology, and beyond 時間：93年5月31日（星期一）18:30~21:30 地點：山腰大廳講者：李俊宏　醫師（台北市立療養院）講題：電影院及討論會（?美麗境界?老大靠邊閃?火柴人）時間：93年5月31日~ 6月7日(weekday)；每日第七、八堂地點：傳醫大樓乙棟 401 室講者：Professor Lawrence Kahan（ University of Wisconsin ）講題：Structure/function relationships in blood proteins 時間：93年6月1日（星期二）8:10-4:00 地點：活動中心第一會議室講題：陽明醫學教育基金會紀念尹珣若先生碩士班論文比賽時間：93年6月1日（星期二）中午12:00 地點：陽明大學護理館三樓301會議室講者：林姝君　副教授 (口腔生物研究所) 講題：Molecular alterations in areca-associated oral cancer 檳榔口腔癌之分子變異時間：93年6月2日（星期三）10:10-12:00 地點：活動中心第三會議室講者：花亦芬　助理教授講題：期末討論時間：93年6月2日（星期三）晚上7:00-9:00 地點：公務人力發展中心（台北市新生南路三段３０號）講者：公務人力發展中心講員講題：人生哲學時間：93年6月3~4日（星期四~五），8:10-5:30 地點：實驗大樓B1區會議室(原育成中心) 講者：Prof. Hiroshi Masuhara （Head of the Department of Applied Physics,Osaka University, Japan）講題：spectroscopy and nano imaging (I)、spectroscopy and nano imaging (Il) 時間：93年6月4日（五）上午10:10- 2:00 地點：研究大樓 103 室講者：呂育道　教授（ PH.D. in Compuiter Science, Harvard University, 台灣大學, 資訊工程學系及財務金融學系）講題：From Financial Derivatives (衍生性金融商品) to Diffusion Equation 時間：93年6月4日 (星期五) 下午 13:30-14:30 地點：研究大樓 202 室講者：呂　仁博士講題：1. Molecular mechanism of Epstein-Barr virus-enhanced cell migration andproliferation EB病毒增進細胞轉移及增生之分子機制 2. Systematic analysis the biological functions of secreted and transmembrane proteins in stem cells 系統性研究胞外蛋白及膜蛋白在幹細胞中的作用時間：93 年 6月4日（星期五）下午13:30-15:20 地點：傳醫大樓乙棟四樓微免所 401 教室講者：Dr. Hsin-Ling Hsu (徐欣伶)（ Research Assistant Professor Northwestern University Medical School , Chicago, IL）講題：1. Ku acts in a unique way at the mammalian telomere to prevent end joining 2. The MCT-1 oncogene transforms human mammary epithelial cells and deregulates DNA damage response ３４２期截稿日期：93年6月10日（星期四）上午十二時正，敬請踴躍提供訊息。
夏日炎炎．力爭上游 ─ 水上運動大會現場實況轉播
(國立陽明大學, 2004-06-01)
陽明電子報編輯小組
5/25早上，游泳池畔陣陣的喧鬧聲，震天價響。一年一度的水上運動大會歡樂登場，請看我們的現場實況轉播
搶救生命，你準備好了嗎？
(國立陽明大學, 2004-06-01)
陽明電子報編輯小組
5/28（五）上午十時，前環保署署長，現任紅十字會秘書長的郝龍斌先生，在他夫人高閬仙老師的陪伴下，輕鬆地步入本校活動中心第一會議室。郝秘書長這天是應通識中心邀請，為全校師生演講＜搶救生命，你準備好了嗎？＞一小時的演講過程中.
A novel washout filter design for a six degree-of-freedom motion simulator
(2004-06-01)
Liao, CS
;
Huang, CF
;
Chieng, WH
;
機械工程學系
;
Department of Mechanical Engineering
The motion cue performed by a motion simulator is restrained by the workspace of the simulator structure. A typical reasoning is then to build a large motion simulator. unless it is for entertainment, which involves in small simulators. This study proposes a novel approach to designing the washout filter of the motion control of a six degree-of-freedom motion simulator for entertainment purposes. Using information obtained from the inverse kinematics of the simulator, the workspace boundary, detected in real-time, is fed into the washout filter as a reference for the motion planning. The main focus of this approach is to make the motion cue feasible for use in a simulator with a restricted workspace, while ensuring the robustness of the driving system. In this paper, different indices are established to specify the performance of the motion cue. A classical linear washout filter was implemented and compared with the proposed washout filter using the performance indices to demonstrate the benefits of the latter.
選擇性沉積碳奈米結構於矽晶基材之方法
(2004-06-01)
郭正次
;
張惠林
;
林兆焄
;
許智明
本發明選擇性沉積碳奈米結構於矽晶基材之方法，依序包含下列步驟：於矽晶基材上決定欲成長碳奈米結構的區域；於欲成長碳奈米結構的區域生長金屬矽化物；於金屬矽化物表面利用化學氣相沉積法成長碳奈米結構。由於在矽晶基材上之金屬矽化物區域即為碳奈米結構成長區域，因而達到選擇性沉積碳奈米結構之目的，另且，該金屬矽化物區域係由半導體製程方法製造，所以本發明的製程方法與現有半導體設備相容性高。
Shot-noise spectrum of superradiant entangled excitons
(2004-06-01)
Chen, YN
;
Brandes, T
;
Li, CM
;
Chuu, DS
;
電子物理學系
The shot noise produced by tunneling of electrons and holes into a double dot system incorporated inside a p-i-n junction is investigated theoretically. The enhancement of the shot noise is shown to originate from the entangled electron-hole pair created by superradiance. The analogy to the superconducting Cooper pair box is pointed out. A series of Zeno-like measurements is shown to destroy the entanglement, except for the case of maximum entanglement.