Browsing by Issue Date, starting with "2014-03-11"

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Controller apparatus for controlling a multiphase multilevel voltage source inverter and a method thereof
(2014-03-11)
Hu Jwu-Sheng
;
Chen Keng-Yuan
;
Tang Chi-Him
The present invention provides an apparatus for controlling a multiphase multilevel voltage source inverter. The apparatus includes a signal-generating unit and a converter. The signal-generating unit responds to an input signal to produce a switching strategy control signal and a duration timing control signal corresponding to the switching strategy control signal. The converting unit responds to the switching strategy control signal and the duration timing control signal to produce a switching signal. The voltage source inverter responds to the switching signal to generate a multiphase-and-multilevel AC voltage output.
Holographic model of a two-band superconductor
(2014-03-11)
Wen, Wen-Yu
;
Wu, Mu-Sheng
;
Wu, Shang-Yu
;
物理研究所
;
丘成桐中心
We construct a holographic two-band superconductor model with interband Josephson coupling. We investigate the effects the Josephson coupling has on the superconducting condensates and the critical temperature for their formation numerically, as well as analytically where possible. We calculate the ac conductivity and find it qualitatively similar to the single band superconductor. We investigate the nodal structure of our holographic two-band superconductor from the low temperature behavior of the thermal conductivity and find it nodeless.
與通訊對象相關之即時可重組電話號碼系統及運用該系統之通訊方法
(2014-03-11)
張明峰
;
林一平
一種與通訊對象相關之即時可重組電話號碼系統及運用該系統之通訊方法。該系統包含一電話號碼轉換表及一服務伺服器。該電話號碼轉換表包括多筆轉換記錄。該等轉換記錄的其中一筆記錄著一服務使用者電話號碼、一特定臨時電話號碼及一指定通訊對象電話號碼。該服務伺服器根據服務使用者所指定的指定通訊對象電話號碼，產生特定臨時電話號碼，並將服務使用者電話號碼及相對應的特定臨時電話號碼及指定通訊對象電話號碼記錄在電話號碼轉換表中，藉以使服務使用者與指定通訊對象通話或傳送簡訊時，可用該特定臨時電話號碼替換該服務使用者電話號碼，而不讓指定通訊對象知道服務使用者電話號碼。
用於減緩介金屬化合物成長之方法
(2014-03-11)
陳智
;
杜經寧
;
蕭翔耀
本發明係有關於一種用於減緩介金屬化合物成長之方法，步驟包含：(i)製備一基板元件，包括在一基板上電鍍至少一金屬墊層，接著在該金屬墊層上電鍍至少一很薄的一薄銲料，進行適當的熱處理製程；(ii)在該基板元件上再鍍上適當厚度的銲料；其中，該薄銲料經過適當的熱處理後，會與金屬墊之金屬反應形成一薄的介金屬化合物，因此可以在之後的迴銲製程抑制介金屬化合物的生成速率之效果，藉以減緩微小接點銲料與金屬墊上的金屬反應變成介金屬化合物。一旦介金屬化合物成長速率能被減緩，錫晶鬚(Sn whisker)的成長也可以被抑制。
半導體元件之參數萃取方法
(2014-03-11)
郭治群
;
葉國良
一種參數萃取方法，用以萃取一半導體元件的新增通道寬度，其步驟包括：提供一第一多閘指元件及一第二多閘指元件，兩者的閘指數目不相同；進行一去嵌化動作後，量測第一多閘指元件之第一有效電容值以及第二多閘指元件之第二有效電容值；根據第一與第二有效電容值對應於第一與第二多閘指元件的閘指數目的直線關係，以求得一斜率；執行三維電容模擬以計算半導體元件的雜散電容值；提供一長通道元件，並量測其閘極電容值，以求得一通道單位面積電容值；以及利用斜率、雜散電容值以及通道單位面積電容值，以計算得到半導體元件之新增通道寬度。
一種自動化專利交易平台系統
(2014-03-11)
李鎮宜
;
黃經堯
;
張志華
;
吳志偉
;
吳怡如
本發明揭露一種自動化專利交易平台系統，其主要元件包括有專利資料庫，會員資料庫，媒合運算裝置，分享運算裝置，非會員資料庫，以及授權與買賣運算裝置等元件以相互連接組合而成。本發明之操作方法亦可分為包括會員與非會員加入之方法，以及僅有會員加入之操作方法；故而本發明可提高專利的交易效率且能降低專利交易成本。
使用共用傳導層傳送晶片間多重信號之系統
(2014-03-11)
蘇朝琴
;
何盈杰
;
黃博祥
本發明提供一種使用共用傳導層傳送晶片間多重信號之系統，其包括一第一晶片、一第二晶片、及一共用傳導層。該第一晶片至少具有第一晶片之第一金屬層墊及一第二金屬層墊。該第二晶片至少具有第二晶片之第一金屬層墊及一第二金屬層墊。該共用傳導層為導電材料，該共用傳導層直接黏合該第一晶片及該第二晶片，其中，第二晶片之第一金屬層墊係對齊該第一晶片之第一金屬層墊，以透過該共用傳導層而接收來自該第一晶片之第一金屬層墊之訊號，而不受來自其它該第一晶片及第二晶片之金屬層墊之訊號的影響。
Effect of ion-milled barriers on electron transport in micrometer-sized tunnel junctions
(2014-03-12)
Lee, Yen-Chi
;
Lin, Yong-Han
;
Wu, Jong-Ching
;
Lin, Juhn-Jong
;
電子物理學系
We studied the electron transport properties of micrometre-sized all-Al tunnel junctions (TJs) between 2 and 300 K, in which the AlOx layer grown by O-2 plasma was moderately Ar-ion-milled prior to top electrode deposition. In contrast to the direct tunnelling in the TJs whose barriers are intact (not ion-milled), the zero-bias conductances and the current-voltage characteristics of the TJs as processed are found to be best described by the fluctuation-induced tunnelling conduction mechanism. This observation indicates the formation of nanoscopic incomplete pinholes in the AlOx layer, owing to large junction-barrier interfacial roughness introduced by the ion-milling process. Topographical features revealed by the cross-sectional transmission electron microscopy imaging of the TJ stack conform to this result. This study is of relevance to cases in which ion-milling techniques are applied in tailoring the TJ properties.
Anomalous anticrossing of neutral exciton states in GaAs/AlGaAs quantum dots
(2014-03-12)
Kumar, S.
;
Zallo, E.
;
Liao, Y. H.
;
Lin, P. Y.
;
Trotta, R.
We study the effects of heavy hole-light hole (HH-LH) mixing on fine-structure and polarization properties of neutral excitons ( X-0) confined in single GaAs/AlGaAs quantum dots (QDs) under the application of anisotropic biaxial stress. In the large HH-LH mixing regime, these properties are substantially different from the usually observed properties in the case of small or no mixing. By varying the applied stress, the mixing in the initially strain-free QDs changes from similar to 0 to similar to 70% and an anomalous anticrossing of the X-0 bright states is observed. The latter is attributed to stress-induced rotation of the in-plane principal axis of the QD confinement potential. We show that the analysis of free-excitonic emission of bulk GaAs surrounding the QDs not only allows estimation of the stress and mixing in the QDs, but also provides the quantum-confinement-induced HH-LH splitting of the as-grown QDs.
REAL-TIME PEOPLE COUNTING SYSTEM USING LAYER SCANNING METHOD
(2014-03-13)
Lin Daw-Tung
;
Jhuang Dong-Han
Disclosed herein is a method for counting the number of the targets using the layer scanning method. The steps of this method includes constructing a background frame, filtering the noise of foreground frame and classifying the targets, and screening the area of targets based on layer scanning to calculate the number of targets by determining the highest positions of the respective targets. In addition, the dynamic numbers of targets are calculated using algorithm. Accordingly, the present invention is beneficial in automatically, effectively and precisely calculating the number of the targets in/out a specific area, achieving the flow control for targets and reducing artificial error upon calculation.
Mechanics and response of a surface rock block subjected to pressure fluctuations: A plucking model and its application
(2014-03-13)
Pan, Yii-Wen
;
Li, Kuo-Wei
;
Liao, Jyh-Jong
;
土木工程學系
;
Department of Civil Engineering
Plucking (removal of rock blocks) is often the dominant mechanism for producing a scour hole on riverbeds comprised of heavily jointed rocic masses being subjected to pressure fluctuations from a jet flow. This paper explores the mechanics and response of a surface block subjected to pressure fluctuations. First a particle-flow simulation was conducted to demonstrate how repeated pressure fluctuations are able to gradually remove rock bridges in discontinuities surrounding a rock block, if a pressure fluctuation's intensity is substantial. As a consequence, these weak planes may become fully persistent. The block's uplift speed then depends on the pressure differences on the opposite (horizontal) faces, and the frictional resistance of the lateral discontinuities. This paper proposes a theoretical framework to model the mechanics and response of a rock block subjected to a sinusoidal pressure fluctuation. This model can be applied to estimate the development of a scour hole, through plucking, during a specific flood event. An example demonstrates the applicability of the proposed approach in predicting the potential depth of the scour hole. (C) 2013 Elsevier B.V. All rights reserved.
Increased Risk of Major Depression in the Three Years following a Femoral Neck Fracture-A National Population-Based Follow-Up Study
(2014-03-13)
Chang, Chih-Yu
;
Chen, Wen-Liang
;
Liou, Yi-Fan
;
Ke, Chih-Chi
;
Lee, Hua-Chin
Femoral neck fracture is common in the elderly, and its impact has increased in aging societies. Comorbidities, poor levels of activity and pain may contribute to the development of depression, but these factors have not been well addressed. This study aims to investigate the frequency and risk of major depression after a femoral neck fracture using a nationwide population-based study. The Taiwan Longitudinal Health Insurance Database was used in this study. A total of 4,547 patients who were hospitalized for femoral neck fracture within 2003 to 2007 were recruited as a study group; 13,641 matched non-fracture participants were enrolled as a comparison group. Each patient was prospectively followed for 3 years to monitor the occurrence of major depression. Cox proportional-hazards models were used to compute the risk of major depression between members of the study and comparison group after adjusting for residence and sociodemographic characteristics. The most common physical comorbidities that were present after the fracture were also analyzed. The incidences of major depression were 1.2% (n = 55) and 0.7% (n = 95) in the study and comparison groups, respectively. The stratified Cox proportional analysis showed a covariate-adjusted hazard ratio of major depression among patients with femoral neck fracture that was 1.82 times greater (95% CI, 1.30-2.53) than that of the comparison group. Most major depressive episodes (34.5%) presented within the first 200 days following the fracture. In conclusion, patients with a femoral neck fracture are at an increased risk of subsequent major depression. Most importantly, major depressive episodes mainly occurred within the first 200 days following the fracture.
Microstructural evolution and bonding mechanisms of the brazed Ti/ZrO2 joint using an Ag68.8Cu26.7Ti4.5 interlayer at 900 degrees C
(2014-03-14)
Wei, Shen-Hung
;
Lin, Chien-Cheng
;
材料科學與工程學系
;
Department of Materials Science and Engineering
In this study, 3 mol% Y2O3-stabilized zirconia (3Y-ZrO2) and commercially pure titanium (cp-Ti) joints were fabricated with an Ag68.8Cu26.7Ti4.5 interlayer (Ticusil) at 900 degrees C for various brazing periods. After brazing at 900 degrees C/0.1 h, Ti2Cu, TiCu, Ti3Cu4, and TiCu4 layers were present at the Ti/Ticusil interface, while TiCu and TiO layers were observed at the Ticusil/3Y-ZrO2 interface. In the residual interlayer, clumpy TiCu4 was formed along with the Ag solid phase. After brazing at 900 degrees C/1 h, Ti3Cu3O and Ti2O layers were formed at the interlayer/ZrO2 interface, while Cu2O was precipitated in the residual interlayer with [111](Cu2O)//[111](Ag) and (20 (2) over bar)(Cu2O)//(20 (2) over bar)(Ag). After brazing at 900 degrees C/6 h, a two-phase (alpha-Ti + Ti2Cu) region was observed on the Ti side with [2 (1) over bar(1) over bar0](alpha-Ti)//[100](Ti2Cu) and (0002)(alpha-Ti)//(0 (1) over bar3)(Ti2Cu), while the TiCu layer grew at the expense of Ti3Cu4 and TiCu4. The bonding mechanisms and diffusion paths were explored with the aid of Ag-Cu-Ti and Ti-Cu-O ternary phase diagrams.
Generation of multi-color carrier-envelope phase locked pulse with continuous color tunability
(2014-03-15)
Yabushita, Atsushi
;
Juang, Ding-Yi
;
Kao, Chih-Hsien
;
Baltuska, Andrius
;
Kobayashi, Takayoshi
Several methods exist to lock carrier envelope phase (CEP), which is generally not locked in common laser systems. Our previous work succeeded passive lock of CEP by using a technique of non-collinear optical parametric amplifier. In the present work, we have proposed and demonstrated two schemes to generate multi-color CEP-locked beams using the non-collinear optical parametric amplifier. In the first scheme, spatial filter in the spatially dispersed seed light was used to generate three-color CEP-locked pulse demonstrating ifs arbitral color tunability. In the second scheme, parabolic chirp was introduced on the seed pulse to generate two color CEP-locked pulses with continuous color tunability. (C) 2013 Elsevier B.V. All rights reserved.
Efficient high-power terahertz beating in a dual-wavelength synchronously mode-locked laser with dual gain media
(2014-03-15)
Huang, Y. J.
;
Tzeng, Y. S.
;
Tang, C. Y.
;
Chiang, S. Y.
;
Liang, H. C.
We originally present a novel tactic to accomplish a compact efficient dual-wavelength synchronously mode-locked laser by physically combining the Nd:YVO4 crystal to the Nd: GdVO4 crystal as a composite gain medium. With the developed method, the total output power at 1.06 mu m could be effectually produced to reach 1.3 W under the optimally balanced two-color intensities. The corresponding mode-locked pulse width and repetition rate are measured to be 47 ps and 2.86 GHz, respectively. Through the optical beating between two carrier frequencies of dual-color synchronous pulses, a train of 0.32 THz ultrashort pulses is further generated with the effective duration of down to 1.6 ps. (C) 2014 Optical Society of America
The Role of Psychosocial and Cultural Factors as Correlates of Depressive Symptoms in Chinese-American Older Adults
(2014-03-15)
Lin, Shumin
;
Liu, Jielin
;
Jang, Yuri
;
英語教學研究所
;
Institute of Teaching English to speakers of other Languages
Building upon the literature showing the negative impact of physical health constraints on depressive symptoms, this study examined the role of health and psychosocial and cultural factors as correlates of depressive symptoms in community-dwelling Chinese-American older adults. Data were drawn from surveys with 108 older Chinese Americans living in the Tampa and Orlando areas of Florida (M age = 70.6 years, SD=7.70). Results from hierarchical regression analysis suggest the importance of chronic health conditions and functional status as correlates of depressive symptoms. In addition, high levels of sense of mastery and acculturation were also found to be significant. Findings highlight the importance of psychosocial and cultural factors and suggest that such factors need to be considered in efforts to promote the mental health of ethnic minority older adults. Limitations and clinical implications of the findings are discussed.
Effective and site-specific phosphoramidation reaction for universally labeling nucleic acids
(2014-03-15)
Su, Yu-Chih
;
Chen, Hsing-Yin
;
Ko, Ni Chien
;
Hwang, Chi-Ching
;
Wu, Min Hui
Here we report efficient and selective postsynthesis labeling strategies, based on an advanced phosphoramidation reaction, for nucleic acids of either synthetic or enzyme-catalyzed origin. The reactions provided phosphorimidazolide intermediates of DNA or RNA which, whether reacted in one pot (one-step) or purified (two-step), were directly or indirectly phosphoramidated with label molecules. The acquired fluorophore-labeled nucleic acids, prepared from the phosphoramidation reactions, demonstrated labeling efficacy by their F/N ratio values (number of fluorophores per molecule of nucleic acid) of 0.02-1.2 which are comparable or better than conventional postsynthesis fluorescent labeling methods for DNA and RNA. Yet, PCR and UV melting studies of the one-step phosphoramidation-prepared FITC-labeled DNA indicated that the reaction might facilitate nonspecific hybridization in nucleic acids. Intrinsic hybridization specificity of nucleic acids was, however, conserved in the two-step phosphoramidation reaction. The reaction of site-specific labeling nucleic acids at the 5'-end was supported by fluorescence quenching and UV melting studies of fluorophore-labeled DNA. The two-step phosphoramidation-based, effective, and site-specific labeling method has the potential to expedite critical research including visualization, quantification, structural determination, localization, and distribution of nucleic acids in vivo and in vitro. (C) 2013 Elsevier Inc. All rights reserved.
Solid solution strengthening and phase transformation in high-temperature annealed Si80Ge20 alloy
(2014-03-15)
Chiang, Tun-Yuan
;
Wen, Hua-Chiang
;
Chou, Wu-Ching
;
Tsai, Chien-Huang
;
電子物理學系
This investigation demonstrates the temperature-dependent mechanical properties of Si80Ge20 alloy films via a nanoindenter in the indentation depth of 100 nm. The roughly equal root mean square roughness (R-rms) values and repeatable load-displacement (P-delta) curves for the samples ensure the mechanical performances mainly contributed from the influences of annealing temperatures. The hardness (H) values of samples increase with the temperatures of an initial annealing in the range from RT to 900 degrees C, and, conversely, decrease for annealing temperatures over 900 degrees C. Accordingly, both E/H and h(r)/h(max) values, exhibiting an inverse tendency in the above temperature range, hints that the solid solution strengthening effect and the softening phenomenon occur for the initial-annealing and over-annealing stages, respectively. In addition, grazing incidence X-ray diffraction (GIXRD) analysis demonstrates the lattice expansion and the broadened peak that attribute to the solid solution strengthening of samples and the segregation of Ge, respectively. Through observing the value of the (200) lattice spacing of 5.624 A for a 900 degrees C-annealed sample by transmission electron microscopy (TEM) analysis, it is verified that the segregation of Ge is responsible for the decreased hardness for the 1000 degrees C-annealed sample. (C) 2013 Elsevier B.V. All rights reserved.
Ultrahigh capacity 2 x 2 MIMO RoF system at 60 GHz employing single-sideband single-carrier modulation
(2014-03-15)
Lin, Chun-Ting
;
Ho, Chun-Hung
;
Huang, Hou-Tzu
;
Cheng, Yu-Hsuan
;
光電系統研究所
This article proposes and experimentally demonstrates a radio-over-fiber system employing single-sideband single-carrier (SSB-SC) modulation at 60 GHz. SSB-SC modulation has a lower peak-to-average-power ratio than orthogonal frequency division multiplex (OFDM) modulation; therefore, the SSB-SC signals provide superior nonlinear tolerance, compared to OFDM signals. Moreover, multiple-input multiple-output (MIMO) technology was used extensively to enhance spectral efficiency. A least-mean-square-based equalizer was implemented, including MIMO channel estimation, frequency response equalization, and I/Q imbalance compensation to recover the MIMO signals. Thus, using 2 x 2 MIMO technology and 64-QAM SSB-SC signals, we achieved the highest data rate of 84 Gbps with 12 bit/s/Hz spectral efficiency using the 7-GHz license-free band at 60 GHz. (C) 2014 Optical Society of America
Au nanoplates as robust, recyclable SERS substrates for ultrasensitive chemical sensing
(2014-03-15)
Lin, Wei-Hao
;
Lu, Yi-Hsuan
;
Hsu, Yung-Jung
;
材料科學與工程學系
;
Department of Materials Science and Engineering
With the structural advantages of being sharp and straight, Au nanoplates may work as a promising surface-enhanced Raman scattering (SERS) platform for detection of Raman-sensitive analytes. However, the utilization of Au nanoplates as realistic SERS substrates is still not widely investigated, especially in the practical detection of environmentally persistent pollutants. This work delivers the first successful demonstration of using Au nanoplate platform in practical SERS sensing toward a typical polycyclic aromatic hydrocarbons pollutant of pyrene. The samples were prepared using an environmentally benign seed-mediated growth approach without the post-purification treatment. It was found that Au nanoplates exhibited significantly enhanced SERS activities (enhancement factor = 7.30 x 10(7)) and achieved an extremely low detection limit (5 x 10(-10) M) toward pyrene molecules. Furthermore, the SERS activity of Au nanoplates can be fully recovered after repeatedly used and recycled in pyrene detection. These results manifest that the present Au nanoplates can serve as robust, recyclable SERS substrates that allow rapid detection of trace levels of analytes with a high degree of sensitivity and stability. The findings from this work may facilitate the use of Au nanoplate SERS substrates in more realistic applications such as biomolecule sensing and environmental monitoring. (C) 2013 Elsevier Inc. All rights reserved.