Browsing by Issue Date, starting with "2005-04-07"

Now showing 1 - 20 of 66884

Risk factors for fatal candidemia caused by Candida albicans and non-albicans Candida species
(2005-04-07)
Cheng, MF
;
Yang, YL
;
Yao, TJ
;
Lin, CY
;
Liu, JS
Background: Invasive fungal infections, such as candidemia, caused by Candida species have been increasing. Candidemia is not only associated with a high mortality (30% to 40%) but also extends the length of hospital stay and increases the costs of medical care. Sepsis caused by Candida species is clinically indistinguishable from bacterial infections. Although, the clinical presentations of the patients with candidemia caused by Candida albicans and non-albicans Candida species (NAC) are indistinguishable, the susceptibilities to antifungal agents of these species are different. In this study, we attempted to identify the risk factors for candidemia caused by C. albicans and NAC in the hope that this may guide initial empiric therapy. Methods: A retrospective chart review was conducted during 1996 to 1999 at the Veterans General Hospital-Taipei. Results: There were 130 fatal cases of candidemia, including 68 patients with C. albicans and 62 with NAC. Candidemia was the most likely cause of death in 55 of the 130 patients (42.3%). There was no significant difference in the distribution of Candida species between those died of candidemia and those died of underlying conditions. Patients who had one of the following conditions were more likely to have C. albicans, age >= 65 years, immunosuppression accounted to prior use of steroids, leukocytosis, in the intensive care unit (ICU), and intravascular and urinary catheters. Patients who had undergone cancer chemotherapy often appeared less critically ill and were more likely to have NAC. Conclusion: Clinical and epidemiological differences in the risk factors between candidemia caused by C. albicans and NAC may provide helpful clues to initiate empiric therapy for patients infected with C. albicans versus NAC.
Optical monitoring apparatus for use in wavelength division multiplexing network
(2005-04-07)
Chi, Sien
;
Lee, Chien-Chung
;
Yeh, Chien-Hung
An optical monitoring apparatus based on the scanning of the gain profile of erbium-doped fiber amplifiers (EDFA) and applied in a wavelength division multiplexing network has been proposed and experimentally demonstrated. The EDFA with an injected saturated tone can provide variable gain or loss profile by controlling the pump power. The components used in the present optical monitoring apparatus for use in a wavelength division multiplexing network are easily available and cost-effective, valuable for monitoring frequency and power of a WDM optical communication system, and capable of greatly enhancing resolution of monitoring frequency spectrum for the optical fiber network system.
Vibrations of skewed cantilevered triangular, trapezoidal and parallelogram Mindlin plates with considering corner stress singularities
(2005-04-07)
Huang, CS
;
Leissa, AW
;
Chang, MJ
;
土木工程學系
;
Department of Civil Engineering
Based on the Mindlin shear deformation plate theory, a method is presented for determining natural frequencies of skewed cantilevered triangular, trapezoidal and parallelograrn plates using the Ritz method, considering the effects of stress singularities at the clamped re-entrant corner. The admissible displacement functions include polynomials and corner functions. The admissible polynomials form a mathematically complete set and guarantee the solution convergent to the exact frequencies when Sufficient terms are used. The corner functions properly account for the singularities of moments and shear forces at the re-entrant corner and accelerate the convergence of the solution. Detailed convergence Studies are carried out for plates of various shapes to elucidate the positive effects of corner functions Oil the accuracy of the solution. The results obtained herein are compared with those obtained by other investigators to demonstrate the validity and accuracy of the solution. Copyright (c) 2005 John Wiley B Sons, Ltd.
X-ray micromachining SU-8 resist for a terahertz photonic filter
(2005-04-07)
Shew, BY
;
Li, HC
;
Pan, CL
;
Ko, CH
;
機械工程學系
Deep x-ray lithography (DXL) was used to fabricate two-dimensional photonic crystals (PCs) for a terahertz high-pass filter. Instead of the conventional poly(methyl rnethacrylate) resist, high-sensitivity SU-8 resist was used to pattern the ultra-deep (1 mm), and high aspect ratio (> 30) PC structures. In this study, an x-ray mask with thick Si membrane was used in the DXL process owing to the high-sensitivity nature of SU-8. The robust mask structure can significantly improve the fabrication yield of the conventional x-ray mask with a very thin (< 2 mu m) membrane. Preliminary results demonstrate that SU-8 has poor pattern definition after DXL process, probably due to its high sensitivity. This phenomenon can be eliminated by dissolving oxygen into the resist to 'quench' the excessive photochemical reaction. Thanks to the high adhesion property of SU-8, the sticking problem of the high aspect ratio crystals is easily solved with natural drying by reducing the unbalanced capillary force. After optimizing all the processes. the proposed DXL SU-8 technique successively fabricated the terahertz crystals with high efficiency, high precision 1(< 1 mu m) and high surface quality (R(a) similar to 12 nm). The resist pillars were then deposited with a 300 nm thick gold layer for subsequent terahertz, measurement. The measurement results show that the PC structure acts as a high-pass filter in the terahertz, range. agreeing with the simulation results.
Selective area growth carbon nanotubes by metal imprint method
(2005-04-07)
Wu, YewChung Sermon
;
Chao, Chi Wei
;
Hou, Chih Yuan
Manufacturing methods of using a metal imprint technique for growing carbon nanotubes on selective areas and the structures formed thereof are provided. One of the manufacturing methods includes steps of forming a first substrate with tapered structures applied with a metal catalyst, imprinting a second substrate on the first substrate for being a growth substrate, and growing carbon nanotubes on the growth substrate. The other manufacturing method includes steps of forming a first substrate with tapered structures, imprinting the first substrate on a second substrate applied with a metal catalyst for forming a second growth substrate, and growing carbon nanotubes on the second grown substrate. And, the formed structures of the present invention include a substrate, plural carbon nanotubes, and plural imprinted vestiges.
Direct quantitative analysis of phthalate esters as micro-contaminants in cleanroom air and wafer surfaces by auto-thermal desorption-gas chromatography-mass spectrometry
(2005-04-08)
Kang, YH
;
Den, W
;
Bai, HL
;
Ko, FH
;
環境工程研究所
This study established an analytical method for the trace analyses of two phthalate esters, including diethyl phthalate (DEP) and di-n-butyl phthalate (DBP), known as the major constituents of cleanroom micro-contamination detrimental to the reliability of semiconductor devices. Using thermal desorption coupled with a GC-MS system, standard tubes were prepared by delivering liquid standards pre-vaporized by a quasi-vaporizer into Tenax GR tubes for calibration. This method was capable of achieving detection limits of 0.05 mu g m(-3) for 0.1 m(3) air samples and 0.03 ng cm(-2) for 150-mm wafer surface density. Actual samples collected from a semiconductor cleanroom showed that the concentration of DBP in a polypropylene wafer box (0.45 mu g m(-3)) was nearly four times higher than that in the cleanroom environment (0.12 mu g m(-3)). The surface contamination of DBP was 0.67 ng cm(-2) for a wafer stored in the wafer box for 24 h. Furthermore, among the three types of heat-resistant O-ring materials tested, Kalrez((R)) was found to be particularly suitable for high-temperature processes in semiconductor cleanrooms due to their low emissions of organic vapors. This analytical procedure should serve as an effective monitoring method for the organic micro-contamination in cleanroom environments. (c) 2005 Elsevier B.V. All rights reserved.
Performance evaluation of shear links and orthotropic bridge deck panels for the new San Francisco-Oakland Bay Bridge
(2005-04-10)
Uang, CM
;
Seible, F
;
McDaniel, C
;
Chou, CC
;
土木工程學系
This paper presents results from testing and the associated analytical studies of steel shear links and orthotropic bridge decks to support the design of the new East Span for the San Francisco-Oakland Bay Bridge. Cyclic testing of full-scale built-up links showed that the specimens were able to reach an inelastic rotation more than twice that which would be produced from a 1500-year Safety Evaluation Earthquake event. Nevertheless, brittle fracture occurred before the inelastic design rotation capacity, as specified in the AISC Seismic Provisions, was developed. Based on a parametric study, a modification to the welding details was proposed, which proved to be effective in preventing this type of fracture in a subsequent testing program. Monotonic testing of two reduced-scale orthotropic bridge deck panels, one stiffened with closed ribs and another one with open ribs, also showed that these specimens could develop a compression capacity greater than that which would be produced by the design earthquake. The post-buckling behavior was associated with the buckling direction and the type of ribs. Copyright (c) 2005 John Wiley T Sons, Ltd.
光放大器及雷射產生器
(2005-04-11)
陳南光
;
祁甡
;
曾孝明
;
賴杰
本案係使用高濃度且折射率較光纖光芯稍低之光增益介質貼附於具有長作用長度的側磨光纖表面，以製作一體積小、雜訊低且價格便宜之光放大器及雷射產生器，其特點為使用有效作用長度極長之側磨光纖元件配合具高摻雜濃度的光增益介質，並在光纖研磨區域的光芯內部寫入一能將泵浦光反射至光增益介質的光纖光柵，利用此種結構可以有效提昇泵浦效率，並避免自發輻射被過度放大，而消耗了激發光功率及影響光信號品質的缺點。
低溫多晶矽薄膜電晶體主動層之雷射再結晶方法
(2005-04-11)
葉清發
;
陳添富
;
羅正忠
本發明係一種低溫多晶矽薄膜電晶體主動層之雷射再結晶方法，其係利用具單一方向性之非等向性電漿蝕刻(Anisotropic Plasma Etching)在薄膜電晶體主動層側壁形成一間距矽(silicon-spacer)，該間距矽提供了一雷射側向再結晶機制與可防止雷射再結晶後主動層微縮或剝落變形等現象，此發明技術可使通道內之矽晶粒變大但在製程上不需額外光罩，如此同時提升元件特性、提高元件均勻度與節省製程成本，此技術在現今低溫多晶矽薄膜電晶體(LTPS-TFT)領域中將會是一項關鍵技術。
Control of VOCs emissions by condenser pre-treatment in a semiconductor fab
(2005-04-11)
Lin, YC
;
Chang, FT
;
Bai, HL
;
Pei, BS
;
環境工程研究所
The performance of a modified design of local condensers to pre-treat a variety of volatile organic compounds (VOCs) emitted from the stripping process of a semiconductor fab was tested in this study. The reaction temperature of the condensers was controlled at around 10 degrees C, it is relatively higher than the traditional condenser reaction temperature. Both VOCs and water vapors were condensed and formed liquid films. This resulted in an enhancement of the VOCs removals, especially for VOCs of high boiling points or solubility. This can help to prevent the follow up zeolite concentrator from damage. The performance of the integrated system of condenser/zeolite concentrator could, therefore, remain highly efficient for a longer operation time. Its annualized cost would also be lower than installing the zeolite concentrator only. (c) 2005 Elsevier B.V. All rights reserved.
用以靜電放電防護之矽控整流器
(2005-04-11)
柯明道
;
林昆賢
本發明係提供一種用以靜電放電防護之矽控整流器，其包含：一第一電極和一第二電極做為兩極、一P型電晶體(PMOS)、一N型電晶體(NMOS)以及一矽控整流器(Silicon Controlled Rectifier, SCR)結構；係藉由利用電源間的寄生矽控整流器(SCR)以達到全晶片靜電放電防護電路設計(Whole-chip ESD protection design)；其係適用於積體電路產品、IC設計產業以及晶圓代工產業。
Using intensity and wavelength division multiplexing for fiber Bragg grating sensor system
(2005-04-12)
Chi
;
Sien
;
Tseng
;
Hong-Yih
;
Peng
The present invention provides a fiber Bragg grating sensor system, which comprises a light-division device having receiving-sending terminals and sensing terminals, a light generating device and a photo detector coupled with receiving-sending terminal of a light-division device, sensing fibers coupled with the sensing terminals, said sensing fiber comprising a fiber Bragg grating, a information processor connecting with said photo detector. The light-division device distribute different optical energy ratio from said receiving-sending terminals to said sensing terminals. The intensity and wavelength division multiplexing can make different intensity for the information addressed of different sensing fiber on the same optical channel to enhance the sensing capacity of fiber Bragg grating sensor system.
Adjusting mechanism for flying pickup head in data storage device
(2005-04-12)
Liu
;
Tzong-Shi
;
Liu
;
Po-Ching
;
Yu
The present invention provides a tuning mechanism for flying pickup heads in data storage devices. The pickup device includes a coil, a pivot, a suspension, and a piezoelectric bender. The piezoelectric bender made by a bi-layer or a multi-layer piezoelectric material is formed on one end of the suspension, and proper voltages applied to the piezoelectric bender via wires enable the piezoelectric bender to undergo both neutral axis displacement and bending deflection. A pickup head is attached to the free end of the piezoelectric bender opposite to the coil, and via the piezoelectric bender, focusing and tracking motion of the pickup head can be tuned at the same time. Furthermore, since the characteristic of the piezoelectric bender is similar to bimetallic elements, the bender can undergo large bending deflection to compensate large deformation of rotating optical disks, so that the flying height of the pickup head can be tuned to maintain a constant focusing distance in reading/writing data.
1.2V sub-nanoampere A/D converter
(2005-04-14)
Rachmuth, G
;
Yang, YS
;
Poon, CS
;
生物科技學系
;
Department of Biological Science and Technology
CMOS-based integrated biochemical sensors generate photo currents at sub-nanoampere (nA) levels, which present a challenge for digital data acquisition. Proposed is a MOS current-mode analogue-to-digital converter with sub-nA sensitivity. Its inherent low-voltage low-power and small-size capabilities are ideal for portable chemi- or biosensor applications.
Miniaturized microwave integrated circuit using complementary conducting surfaces
(2005-04-14)
Tzuang, Ching-Kuang
;
Chen, Chih-Chiang
The invention discloses a two-dimensional array waveguide structure implemented with multi-layer process or monolithic integrated circuit process. The structure includes a first metal layer, a second metal layer and a dielectric layer. The dielectric layer lain between the first and the second metal layer is for isolating the first metal layer from the second metal layer. The first metal layer and the second metal layer respectively formed from a plurality of first unit cells and second unit cells arranged in rows and columns create the two-dimensional array waveguide structure. The first metal layer consists of a main body and a plurality of connecting arms, whereas the second metal layer consists of a metal wire loop. The second metal layer is located below the first metal layer, and each second unit cell corresponds to each first unit cell in a one-on-one manner to further build a complete unit cell. While the main body of each unit cell corresponds to an inductance element, the connecting arms of each unit cell linking the adjacent unit cells correspond to a capacitance element; therefore, a two-dimensional L-C array is formed.
過客 ? 返鄉 ? - 唭哩岸又見紫斑蝶
(國立陽明大學, 2005-04-15)
李榮文
4月7日上午，台北市文化局樹木保護丈量人員來校與筆者會勘本校符合 [ 台北市樹木保護自治條例 ] 規範的喬木時，在中餐廳附近大花咸豐草叢發現一隻紫斑蝶，筆者拍下這隻紫斑蝶影，經比對確認為斯氏紫斑蝶，此蝶正式宣告紫斑蝶從台灣南部越冬紫斑蝶谷往北遷徙已經來到陽明山區，也就是目前認知中的紫斑蝶最北分布區.....
生物科技管理學程‧九十四學年度第一學期申請辦法
(國立陽明大學, 2005-04-15)
陽明電子報編輯小組
凡符合生物科技管理學程修業辦法之修習資格而有意進入學程之陽明大學學生，請繳交修習申請表（表一）、已修習專業背景課程及學分申請表（表二），並經指導教授及系所主管簽名同意後，向學程委員會提出申請.....
Orbital symmetry and electron correlation in NaxCoO2
(2005-04-15)
Wu, WB
;
Huang, DJ
;
Okamoto, J
;
Tanaka, A
;
Lin, HJ
Measurements of polarization-dependent soft x-ray absorption reveal that the electronic states determining the low-energy excitations of NaxCoO2 have predominantly a(1g) symmetry with significant O 2p character. In contrast to the prediction of band theory, doping-dependent O 1s x-ray absorption shows a large transfer of spectral weight, providing spectral evidence for strong electron correlations of the layered cobaltates. We also found that NaxCoO2 exhibits a charge-transfer electronic character rather than a Mott-Hubbard character.
春之樹
(國立陽明大學, 2005-04-15)
陽明電子報編輯小組
用樹葉來寫日記吧！這兩張照片分別是在4/4及4/10下午拍攝的，樹立於實驗大樓階梯右側..... 2005/4.....
國立陽明大學生化暨分子生物研究所誠徵所長
(國立陽明大學, 2005-04-15)
陽明電子報編輯小組
候選人需具備以下條件： 1.民國32年8月1日以後出生。 2.具教育部審核之教授資格證書，且能於陽明大學專任者。 3.在生化及相關領域有多年之教學研究之經驗。 4.有服務熱誠及具行政協調能力者.....