Browsing by Issue Date, starting with "2012-10-15"

Now showing 1 - 20 of 35231

On the inapproximability of maximum intersection problems
(2012-10-15)
Shieh, Min-Zheng
;
Tsai, Shi-Chun
;
Yang, Ming-Chuan
;
資訊工程學系
;
Department of Computer Science
Given a sets, we want to choose exactly k sets such that the cardinality of their intersection is maximized. This is the so-called MAX-k-INTERSECT problem. We prove that MAX-k-INTERSECT cannot be approximated within an absolute error of 1/2n(1-2 epsilon) + O(n(1-3 epsilon)) unless P = NP. This answers an open question about its hardness. We also give a correct proof of an inapproximable result by Clifford and Papa (2011) [3] by proving that MAX-INTERSECT problem is equivalent to the MAX-CLIQUE problem. (C) 2012 Elsevier B.V. All rights reserved.
Wellbore flow-rate solution for a constant-head test in two-zone finite confined aquifers
(2012-10-15)
Tsai, Chi-Shan
;
Yeh, Hund-Der
;
環境工程研究所
;
Institute of Environmental Engineering
The solution describing the wellbore flow rate in a constant-head test integrated with an optimization approach is commonly used to analyze observed wellbore flow-rate data for estimating the hydrogeological parameters of low-permeability aquifers. To our knowledge, the wellbore flow-rate solution for the constant-head test in a two-zone finite-extent confined aquifer has never been reported so far in the literature. This article is first to develop a mathematical model for describing the head distribution in the two-zone aquifer. The Laplace domain solutions for the head distributions and wellbore flow rate in a two-zone finite confined aquifer are derived using the Laplace transform, and their corresponding time domain solutions are then obtained using the Bromwich integral method and residue theorem. These new solutions are expressed in terms of an infinite series with Bessel functions and not straightforward to calculate numerically. A large-time solution for the wellbore flow rate is therefore developed by employing the relationship of small Laplace variable versus large time variable and L'Hospital's rule. The result shows that the large-time solution is identical to the steady-state solution obtained after applying the Tauberian theorem into the Laplace domain solution. This large-time solution can reduce to the Thiem equation in the case of no skin. Finally, the newly developed solution is used to investigate the effects of outer boundary distance and conductivity ratio on the wellbore flow rate. Copyright (C) 2011 John Wiley & Sons, Ltd.
Ring-Based WDM Access Network Providing Both Rayleigh Backscattering Noise Mitigation and Fiber-Fault Protection
(2012-10-15)
Yeh, C. H.
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Chow, C. W.
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Huang, S. P.
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Sung, J. Y.
;
Liu, Y. L.
In this paper, we propose and investigate a ring-based wavelength-division-multiplexing passive optical network (WDM-PON) providing both Rayleigh backscattering (RB) noise mitigation and fiber-fault protection. The proposed ring-based WDM-PON has a dual-ring architecture to protect and restore any fiber fault. Besides, the ring architecture also can mitigate the RB beat noise, since the RB and the upstream wavelengths are propagating in opposite directions. Here, we discuss and analyze the characteristics of the downstream signals using 10 Gb/s ON-OFF keying (OOK), 10 Gb/s differential phase-shift keying, and 10 Gb/s orthogonal frequency-division multiplexing (OFDM) modulations, respectively. Moreover, we also investigate the upstream traffic using the 2.5 Gb/s OOK and 10 Gb/s OFDM generated by the directly modulated reflective semiconductor optical amplifier-based optical network unit, respectively.
Influence of Mg-containing precursor flow rate on the structural, electrical and mechanical properties of Mg-doped GaN thin films
(2012-10-15)
Ke, Wen-Cheng
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Jian, Sheng-Rui
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Chen, I-Chen
;
Jang, Jason S. -C.
;
Chen, Wei-Kuo
The effects of Mg-containing precursor flow rate on the characteristics of the Mg-doped GaN (GaN:Mg) were systematically studied in this study. The GaN:Mg films were deposited on sapphire substrates by metal-organic chemical-vapor deposition (MOCVD) with various flow rates of 25, 50, 75 and 100 sccm of bis-(cyclopentadienyl)-magnesium (Cp2Mg) precursor. The structural, electrical and nanomechanical properties of GaN:Mg thin films were characterized by X-ray diffraction (XRD), atomic force microscopy (AFM). Hall measurement and nanoindentation techniques, respectively. Results indicated that GaN:Mg films obtained with 25 sccm Cp2Mg possess the highest hole concentration of 3.1 x 10(17) cm(-3). Moreover, the hardness and Young's modulus of GaN:Mg films measured by a Berkovich nanoindenter operated with the continuous contact stiffness measurements (CSM) option showed positive dependence with increasing flow rate of Cp2Mg precursor, presumably due to the solution hardening effect of Mg-doping. (C) 2012 Elsevier B.V. All rights reserved.
Maximizing numerical radii of weighted shifts under weight permutations
(2012-10-15)
Chang, Chi-Tung
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Wang, Kuo-Zhong
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應用數學系
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Department of Applied Mathematics
Let omega(i) is an element of C (1 <= i <= n) and I is an element of S-n, the symmetric group of all permutations of 1, 2,...,n. Suppose A(I) is the weighted cyclic matrix [GRAPHICS] and omega(A(I)) denotes its numerical radius. We characterize those zeta is an element of S-n which satisfy omega(A(zeta)) = max(vertical bar is an element of Sn) omega(A(I)). The characterizations for unilateral and bilateral weighted (backward) shifts are also obtained. Crown Copyright (C) 2012 Published by Elsevier Inc. All rights reserved.
電荷幫浦裝置
(2012-10-16)
邵啟意
;
趙昌博
本發明係揭露一種電荷幫浦裝置,其係連接接收一交流訊號之一第一、第二輸入端,並包含一電子開關組,開關組連接第一、第二輸入端與一地端,以根據交流訊號切換開關狀態。第一、第二輸入端與電子開關組連接相互連接之二電壓提升電路,每一電壓提升電路根據開關狀態接收交流訊號,以分別於交流訊號之正、負半週提升交流訊號之電壓,並交替輸出至少二倍之交流訊號之峰値電壓,供負載使用。本發明不但能在一個週期內提升數倍輸出電壓,更可以利用雙相位輸出,降低連波電壓。
時域反射式潮位量測裝置及其方法
(2012-10-16)
林志平
;
鐘志忠
本發明係揭露一種時域反射式潮位量測裝置及其方法，此裝置包含一無電子零件之感測導波器，藉以量測電磁脈波於潮位之反射訊號；量測方法則透過電磁脈波走時分析，並利用一已建立之感測導波器裝置之系統參數標定程序，以計算出實際潮位位置。有鑑於一般潮位量測技術之缺失，本發明提升系統維護便利性，並可降低測站建置成本。
辨識電器狀態的電力監控系統及其電力監控方法
(2012-10-16)
曹孝櫟
;
賴易聖
;
林明駿
;
陳勇旗
一種基於使用者參與及回饋之辨識電器狀態的電力監控系統及其電力監控方法。所述電力監控系統包括一第一電力監控裝置以及至少一第二電力監控裝置。第一及第二電力監控裝置分別測量第一電源及第二電源的電耗特性,藉以偵測第一變化及第二變化,第二電源為第一電源的分支。這些電力監控裝置進行一層次建構步驟以得知其相對位置,並同步校準第一變化及第二變化以計算第一電器變化。當偵測到第一電器變化時,第一電力監控裝置依據第一電器變化搜尋電器特徵資料庫來取得並監控相似第一電器變化的第一電器的狀態。
Mirrored Prominent Deck B Phenomenon: Frequent Small Losses Override Infrequent Large Gains in the Inverted Iowa Gambling Task
(2012-10-16)
Lin, Ching-Hung
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Song, Tzu-Jiun
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Lin, Yu-Kai
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Chiu, Yao-Chu
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應用化學系
Since Bechara et al. pioneered its development, the Iowa Gambling Task (IGT) has been widely applied to elucidate decision behavior and medial prefrontal function. Although most decision makers can hunch the final benefits of IGT, ventromedial prefrontal lesions generate a myopic choice pattern. Additionally, the Iowa group developed a revised IGT (inverted IGT, iIGT) to confirm the IGT validity. Each iIGT trial was generated from the trial of IGT by multiplying by a "2" to create an inverted monetary value. Thus, bad decks A and B in the IGT become good decks iA and iB in the iIGT; additionally, good decks C and D in the IGT become bad decks iC and iD in the iIGT. Furthermore, IGT possessed mostly the gain trials, and iIGT possessed mainly the loss trials. Therefore, IGT is a frequent-gain-based task, and iIGT is a frequent-loss-based task. However, a growing number of IGT-related studies have identified confounding factors in IGT (i.e., gain-loss frequency), which are demonstrated by the prominent deck B phenomenon (PDB phenomenon). Nevertheless, the mirrored PDB phenomenon and guiding power of gain-loss frequency in iIGT have seldom been reexamined. This experimental finding supports the prediction based on gain-loss frequency. This study identifies the mirrored PDB phenomenon. Frequent small losses override occasional large gains in deck iB of the iIGT. Learning curve analysis generally supports the phenomenon based on gain-loss frequency rather than final outcome. In terms of iIGT and simple versions of iIGT, results of this study demonstrate that high-frequency loss, rather than a satisfactory final outcome, dominates the preference of normal decision makers under uncertainty. Furthermore, normal subjects prefer "no immediate punishment" rather than "final reward" under uncertainty.
Gray level weighting centroid method for holographic data storage
(2012-10-16)
Ou-Yang Mang
;
Chen Yu-Ta
A gray level weighting centroid method for holographic data storage is disclosed. Firstly, a first gray level image having a plurality of blocks is received. Then, a convolution calculation is performed on a weight matrix and the image, so as to obtain a second gray level image having a plurality of blocks each having a gray level value. The gray level values are divided into a bright gray level value and a dark gray level value by a threshold value, so as to convert the second gray level image into a thresholding image and find the positions of the borders of the blocks corresponding to the bright gray level value. Next, the blocks surrounded by the positions of the borders and respectively used as a centroid block are found by making the positions of the borders correspond to the first gray level image. Finally, the centroid block is calculated to obtain a centroid point.
Microfluidic system and method for creating an encapsulated droplet with a removable shell
(2012-10-16)
Fan Shih-Kang
;
Hsu Yao-Wen
;
Chen Chiun-Hsun
A microfluidic system for creating encapsulated droplets whose shells can be further removed comprises: two electrode plates and a spacing structure disposed between the two electrode plates. One of the electrode plates has three reservoir electrodes and a plurality of channel electrodes. The three electrodes are respectively used for accommodating a shell liquid, a core liquid, and a removing liquid which is able to remove the shell liquid. The channel electrodes are used for communicating droplets among the three reservoir electrodes. Via these arrangements, the microfluidic system can create a quantitative shell droplet and a quantitative core droplet, and then merge the shell and core droplets to form an encapsulated droplet. Moreover, the shell of the encapsulated droplet can be removed by mixing it with the removing liquid. This invention is further provided with a method for creating an encapsulated droplet with a removable shell.
繼光鏡掃瞄數位典藏系統及方法
(2012-10-16)
歐陽盟
;
謝耀方
;
陳誌賢
;
李天任
;
徐明景
本發明提供一種繼光鏡掃瞄數位典藏系統及方法，其係利用一鏡頭，可接收目標物之全景影像，再由繼光鏡裝置，選擇需掃描之影像，並傳送出去，並由超頻譜儀接收繼光鏡裝置之訊號並解析，再傳送至感測器，分析超頻譜儀之訊號，至少一照明裝置，位於繼光鏡裝置的至少一側，以及一電腦端，接收感測器之訊號，並且控制繼光鏡裝置與照明裝置。本發明在進行掃描時，自第一側開始擷取及照射擷取範圍，再往下一側移動，重複執行上一步驟，到全景影像掃描完畢。最後，將影像處理及儲存。本發明可在掃描目標物時，不需移動鏡頭且不需長期照射燈光，可減少對藝術品的傷害，並利用繼光鏡裝置的特性，增加了影像的解析度。
利用光纖成像之膠囊內視鏡
(2012-10-16)
歐陽盟
;
鄭偉德
;
湯禹舜
;
賴建成
本發明提供一種利用光纖成像之膠囊內視鏡，係利用光纖成像以取代傳統之內視鏡組取像，主要係將光纖單元、影像擷取單元、射頻傳輸單元及電源單元設置於一具有透明窗的膠囊殼體內，藉由一光源經透明窗照射於一物面上，再經物面反射一光信號導入光纖單元內：由影像擷取單元接收該光信號，並轉換成一影像資訊，射頻傳輸單元係傳輸影像資訊予一外部裝置進行後續的影像處理，即可獲得前視、側視或全景式的環場影像。
時域反射式液面與刷深量測裝置及其方法
(2012-10-16)
林志平
;
鐘志忠
本發明係關於一種時域反射式液面與刷深量測裝置及其方法，特別是一種利用時域反射裝置與方法者，藉以同時監測液面與沖刷深度變化。本發明首先在時域反射導波器設計方面，採用結合類似地錨鋼索的導波器設計，提出符合安裝實務的設計，並考慮導體絕緣處理，解決訊號衰減問題；在量測液面與沖刷深度的量測方法，基於不同介質之電磁波速不同，本發明結合反射訊號辨識與波傳速度標定與分析流程，提出較可靠的訊號分析方法。
Development and implications of technology in reform-based physics laboratories
(2012-10-16)
Chen, Sufen
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Lo, Hao-Chang
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Lin, Jing-Wen
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Liang, Jyh-Chong
;
Chang, Hsin-Yi
Technology has been widely involved in science research. Researchers are now applying it to science education in an attempt to bring students' science activities closer to authentic science activities. The present study synthesizes the research to discuss the development of technology-enhanced laboratories and how technology may contribute to fulfilling the instructional objectives of laboratories in physics. To be more specific, this paper discusses the engagement of technology to innovate physics laboratories and the potential of technology to promote inquiry, instructor and peer interaction, and learning outcomes. We then construct a framework for teachers, scientists, and programmers to guide and evaluate technology-integrated laboratories. The framework includes inquiry learning and openness supported by technology, ways of conducting laboratories, and the diverse learning objectives on which a technology-integrated laboratory may be focused.
雜訊過濾電路以及積體電路
(2012-10-16)
柯明道
;
顏承正
;
陳東暘
一種雜訊過濾電路,適用於一積體電路。一解耦合單元耦接至上述積體電路之一電源接合墊,用以相應於位於上述積體電路之上述電源接合墊的一瞬變電壓,而產生一第一電流。一電流放大電路耦接於上述解耦合單元以及上述積體電路之上述電源接合墊,用以根據上述第一電流,從上述積體電路之上述電源接合墊汲取出一第二電流。
山林文學的殿堂：《山、雲與蕃人》鹿野忠雄的台灣高山紀行
(2012-10-17)
楊南郡
;
開放教育推動中心
;
Open Education Office
課程首頁本課程是由交通大學新文藝復興閱讀計畫提供。 96 年 8 月當各大學紛紛摩拳擦掌準備迎接新生的同時，交通大學校長吳重雨則因為一則來自於七月份泰晤士報，有關於英國首相布朗公布其夏日讀書清單的新聞中，看到了他對知識的尊重。在這同時，吳重雨校長也思考著，要如何為學生準備追求知識的環境和激發他們對知識的尊重與喜愛。台積電張忠謀董事長曾陳述他 18 歲進入哈佛那一年，博覽文史哲理工經典群籍，至此奠定了他求知的基礎，並借海明威名言，將其改為「哈佛這一年為人生可帶走的盛宴。」吳重雨校長以張董事長的學習為借鏡，認為學生固然能藉由自我閱讀的方式學習到豐沛的知識，但透過名人、大師親臨現場地介紹經典書籍，更能加深學子們對於書籍的認識與興趣，這也是「新文藝復興閱讀計劃」 ( 以下簡稱 : 「經典名著選讀」 ) 活動展開籌劃的緣由。於是，吳重雨校長便積極敦請「交大通識教育委員會」，接手籌備本計劃的相關活動，而該中心也成為實際施行本計畫的策動、開課以及認證單位。至此，期許交大學子藉由閱讀、聽講來提昇人文素養、開拓視野的「新文藝復興閱讀計劃」，就此展開。
CHARGE PUMP DEVICE
(2012-10-18)
SHAO Chi Yi
;
Chao Paul C.-P.
A charge pump device is coupled to first and second input terminals receiving an AC signal and comprises an electric switch set and two voltage boost circuits. The electric switch set is coupled to the first and second input terminals and a ground terminal and switches the conduction status thereof according to the AC signal. The two voltage boost circuits are interconnected and coupled to the first and second input terminals and the electric switch set. The boost circuits receive the AC signal according to the conduction status, respectively boost voltage in positive and negative semi-periods of the AC signal, and alternatively output a voltage at least two times the peak voltage of the AC signal, to a load. The present invention not only boosts voltage by several folds within a cycle but also outputs voltage by dual phases to reduce ripple of output voltage.
Protein Engineering of Saccharomyces cerevisiae Oxidosqualene-Lanosterol Cyclase into Parkeol Synthase
(2012-10-19)
Liu, Yuan-Ting
;
Hu, Tain-Chang
;
Chang, Cheng-Hsiang
;
Shie, Wen-Shiang
;
Wu, Tung-Kung
A Saccharomyces cerevisiae oxidosqualene-lanosterol cyclase mutant, ERG7(T384Y/Q450H/V4541), produced parkeol but not lanosterol as the sole end product. Parkeol undergoes downstream metabolism to generate compounds 9 and 10. In vitro incubation of parkeol produced a product profile similar to that of the in vivo experiment. In summary, parkeol undergoes a metabolic pathway similar to that of cycloartenol in yeast but distinct from that of lanosterol in yeast, suggesting that two different metabolic pathways of postoxidosqualene cyclization may exist in S. cerevisiae.
那年我從旅行之外學到的事
(2012-10-21)
張芮瑜
;
Department of Communication and Technology
;
傳播與科技學系
2011年七月，我們首次踏上歐洲大陸，在歐洲的眾多國家中做選擇時，毅然決然決定以最陌生最不為人知的東歐，做為進軍歐陸的第一步。參加旅行社規畫的東歐廿日青春行，以半自助的方式踏遍了東歐六國：德國、捷克、斯洛伐克、斯洛維尼亞、匈牙利、奧地利。