Browsing by Issue Date, starting with "2014-07-01"

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燃料電池系統及其熱回收方法
(2014-07-01)
陳宗麟
;
吳健彰
本發明提供一種燃料電池系統,其至少包含燃料電池、後燃器、熱交換裝置與重組器。其中,後燃器係連接燃料電池以接收燃料電池剩餘之殘料而產生高溫氣體。熱交換裝置至少包含第一熱交換單元及其連接之第二熱交換單元,且第二熱交換單元與燃料輸入管連通以接收燃料。重組器分別連接後燃器、第一熱交換單元與第二熱交換單元,而後燃器輸出之高溫氣體依序傳送至重組器、第一熱交換單元與第二熱交換單元,且高溫氣體提供重組器使第二熱交換單元輸出之燃料重組為富氫氣體所需之熱能。同時,上述燃料電池系統的熱回收方法亦揭露於本發明中。
Biodegradable amphiphilic gelatin/calcium phosphate co-delivery systems with simultaneously encapsulating hydrophilic and hydrophobic drugs for enhanced tumor therapy
(2014-07-01)
Chen, S.
;
Li, W.
;
Su, C.
;
Chen, Y.
;
材料科學與工程學系
Benefit Analysis of Knowledge Management System for Engineering Consulting Firms
(2014-07-01)
Yang, Jyh-Bin
;
Yu, Wen-Der
;
Tseng, Judy C. R.
;
Chang, Chia-Shin
;
Chang, Pei-Lun
Engineering consulting (EC) firms in the construction industry are knowledge-intensive and experience-based organizations. As the knowledge accumulated from previous experiences is the essential asset for wining and managing future projects, many EC firms have developed diversified knowledge management systems (KMSs) to accumulate and retain this essential knowledge. However, evaluation methods and results regarding the benefit analysis of KMSs are rarely found in literature. To evaluate the performances of KMSs, most previous studies have adopted qualitative approaches. This paper, on the other hand, presents a ratio-based approach for evaluating the benefits of KMSs. The proposed approach is tested using one of the KMSs from a study EC firm: the proposal preparation assistant (PPA) system. Based on a test of two real cases, this study found that a 48.7% time reduction in data collection and 25.3% staff-hour savings can be achieved when using the PPA system to prepare service proposal drafts. The results revealed in this study not only prove the usability of the proposed ratio-based benefit analysis approach, but also provide convincing and inspiring information for knowledge management practitioners as they plan their future works. (C) 2014 American Society of Civil Engineers.
畫面估測系統及其估測方法
(2014-07-01)
彭文孝
;
陳渏紋
本發明係揭露一種畫面估測系統及其估測方法，其包含初始模組初始化一具有複數個像素之第一畫面區塊。提供模組係提供一第二畫面區塊之第一重心點及第一運動向量。位置查找模組根據第一重心點查找一位置點，並根據各該像素對第一重心點及位置點之關係，各別對應產生第一權重值和第二權重值。向量查找模組根據第一重心點、第一運動向量、位置點、第一權重值及第二權重值，查找該複數個像素於第一畫面區塊中具有最低像素強度誤差值之第二運動向量。處理模組根據該些運動向量及該些權重值，依序運算各該像素之一預測強度值。
A 2.56 Gb/s Soft RS (255,239) Decoder Chip for Optical Communication Systems
(2014-07-01)
Lin, Yi-Min
;
Hsu, Chih-Hsiang
;
Chang, Hsie-Chia
;
Lee, Chen-Yi
;
電子工程學系及電子研究所
Due to high transmission rate requirement for optical communication systems, the growing uncertainty of received signals results in the limited transmission distance. In this paper, a decision-confined soft RS decoder chip is proposed to enhance the error correcting performance with area-efficient architectures. Instead of generating numerous possible candidate codewords and determining the most likely one as output codeword, our approach produces only one codeword by confining the degree of error location polynomial. Therefore, hardware complexity is significantly reduced by eliminating decision making unit. Moreover, an iteration-reduced RiBM algorithm is provided to enlarge the coding gain by using more least reliable positions (LRPs) in the limited operation latency. According to simulation results, our proposed soft RS (255, 239; 8) decoder with 5 LRPs outperforms 0.4 dB at 10(-4) codeword error rate (CER) as compared to hard RS decoders. Implemented in standard CMOS 90 nm technology, the soft decoder chip can achieve 2.56 Gb/s throughput with similar complexity as a hard decoder. It can fit well for 10-40 Gb/s with 16 RS decoders in optical fiber systems and 2.5 Gb/s GPON applications.
應用增強型窗口方法和相互交替型式於純量乘法演算法之橢圓形曲線加密方法
(2014-07-01)
葉宏男
;
王國禎
;
簡榮宏
本發明係一種應用增強型窗口方法和相互交替型式於純量乘法演算法之橢圓形曲線加密方法。首先選定一條橢圓曲線及在其上的基點。接著依選定之窗口大小，計算出必要之預算點。然後隨機產生私鑰，並利用相互交替型式將私鑰之二進位表示式轉換成帶符號二進位表示式。最後利用增強型窗口方法算出公鑰。藉著大量減少預算點，故此方法可以減少公鑰的產生時間(含計算預算點時間)。
Are all of the human exons alternatively spliced?
(2014-07-01)
Chen, Feng-Chi
;
交大名義發表
;
National Chiao Tung University
Alternative mRNA splicing (AS) is a major mechanism for increasing regulatory complexity. A key concept in AS is the distinction between alternatively and constitutively spliced exons (ASEs and CSEs, respectively). ASEs and CSEs have been reported to be differentially regulated, and to have distinct biological properties. However, the recent flood of RNA-sequencing data has obscured the boundary between ASEs and CSEs. Researchers are beginning to question whether 'authentic CSEs' do exist, and whether the ASE/CSE distinction is biologically invalid. Here, I examine the influences of increasing transcriptome data on the human ASE/CSE classification and our past understanding of the properties of these two types of exons. Interestingly, although the percentage of human ASEs has increased dramatically in recent years, the overall distinction between ASEs and CSEs remain valid. For example, CSEs are longer, evolve more slowly, and less frequently correspond to intrinsically disordered protein regions than ASEs. In addition, only a relatively small number of human genes have their transcripts composed entirely of ASEs despite the large amount of high-throughput transcriptome information. Therefore, the 'backbone' concept of AS, in which CSEs constitute the invariant part and ASEs the flexible part of the transcript, appears to be generally true despite the increasing percentage of ASEs in the human exome.
Achieving good bias stress reliability in organic transistor with vertical channel
(2014-07-01)
Lin, Hung-Cheng
;
Zan, Hsiao-Wen
;
Meng, Hsin-Fei
;
物理研究所
;
電機學院
Unlike organic field-effect transistor with accumulated channel at dielectric/semiconductor interface, vertical organic transistor exhibits bulk channel current and hence performs good bias stress reliability. Adding self-assemble-monolayer to treat vertical channel can further modulate the charge-trapping surrounding the base electrode and hence influence the bias stress reliability. During 4300-s positive/negative bias stresses, stable output current and on/off ratio are demonstrated by using octadecyltrichlorosilane (OTS)-passivated vertical channel. The good reliability together with the low operation voltage and the high output current make vertical organic transistors capable of driving organic light emitting diode. (C) 2014 Elsevier B.V. All rights reserved.
Study of chemical pretreatment and enzymatic saccharification for producing fermentable sugars from rice straw
(2014-07-01)
Chen, Wen-Hsing
;
Chen, Yi-Chun
;
Lin, Jih-Gaw
;
環境工程研究所
;
Institute of Environmental Engineering
This study evaluated a cost-effective approach for the conversion of rice straw into fermentable sugars. The composition of rice straw pretreated with 1 % sulfuric acid or 1 % sodium hydroxide solution was compared to rice straw with no chemical pretreatment. Enzymatic saccharification experiments on non-pretreated rice straw (NPRS), pretreated rice straw (PRS), and pretreated rice straw with acid hydrolysate (PRSAH) were conducted in a series of batch reactors. The results indicated that pretreating the rice straw with dilute acid and base increased the cellulose content from 38 % to over 50 %. During enzymatic saccharification, straight aliphatic cellulose was hydrolyzed before branched hemicellulose, and glucose was the major hydrolysis product. The glucose yield was 0.52 g glucose/g for NPRS and was comparable to the yields of 0.50 g glucose/g for PRS and 0.58 g glucose/g for PRSAH. The hydrolysis of rice straw to produce glucose can be described by a first-order reaction with a rate constant of 0.0550 d(-1) for NPRS, 0.0653 d(-1) for PRSAH, and 0.0654 d(-1) for PRS. Overall, the production of fermentable sugars from ground rice straw will be more cost effective if the straw is not pretreated with chemicals.
三維積體電路
(2014-07-01)
陳冠能
;
李世偉
一種三維積體電路，其包括一第一晶圓及一第二晶圓。第一晶圓包括一第一導電圖樣。第二晶圓包括一第二導電圖樣，且電性連接第一導電圖樣。其中第一晶圓與第二晶圓的位移量係根據第一導電圖樣及第二導電圖樣的電阻值來決定。
Electrical characteristics of amorphous In-Ga-Zn-O thin-film transistors prepared by radio frequency magnetron sputtering with varying oxygen flows
(2014-07-01)
Lee, Yih-Shing
;
Yen, Tung-Wei
;
Lin, Cheng-I
;
Lin, Horng-Chih
;
Yeh, Yun
This study investigates impacts of oxygen flow during the deposition of amorphous indium-gallium-zinc oxide (a-IGZO) channel layer with a radio frequency (r.f.) magnetron sputter on the electrical characteristics of the fabricated thin-film transistors (TFTs). Results indicate that as the film was deposited with a higher oxygen flow, the transfer curves are positively shifted while the field-effect mobility (mu(FE)) is significantly decreased. To get more insight about the effects, channel resistance (R-CH) and the parasitic source-to-drain resistance (R-SD) of the fabricated devices are extracted using the total resistance method. The extracted a-IGZO channel resistance per unit length (r(ch)) and R-SD are found to increase while the extracted effective mobility (mu(E)) is decreased with increasing oxygen flow during sputtering. These observations are postulated to be related the decrease in the In/(In + Ga + Zn) ratio and the increase in the Zn/(In + Ga + Zn) ratio of the a-IGZO films with increasing the oxygen flow rate which lead to higher resistivity and lower carrier concentration. The extracted R-SD can be comparable with R-CH for the devices prepared with high oxygen flow, resulting in the roll-off of mu(FE) as the channel length is shorter than 20 mu m. (C) 2014 Elsevier B.V. All rights reserved.
Performance Enhancement of Flip-Chip Packaged AlGaN/GaN HEMTs Using Active-Region Bumps-Induced Piezoelectric Effect
(2014-07-01)
Tsai, Szu-Ping
;
Hsu, Heng-Tung
;
Chiang, Che-Yang
;
Tu, Yung-Yi
;
Chang, Chia-Hua
We experimentally investigated the impact of different bump patterns on the output electrical characteristics of flip-chip (FC) bonded AlGaN/GaN high-electron mobility transistors in this letter. The bump patterns were designed and intended to provide different levels of tensile stress due to the mismatch in the coefficient of thermal expansion between the materials. After FC packaging, a maximum increase of 4.3% in saturation current was achieved compared with the bare die when proper arrangement of the bumps in active region was designed. In other words, a 17% improvement has been observed on the optimized bump pattern over the conventional bump pattern. To the best of our knowledge, this is the first letter that investigates the piezoelectric effect induced by FC bumps leading to the enhancement in device characteristics after packaging.
High-Resolution Mapping of Chromatin Packaging in Mouse Embryonic Stem Cells and Sperm
(2014-07-01)
Carone, Benjamin R.
;
Hung, Jui-Hung
;
Hainer, Sarah J.
;
Chou, Min-Te
;
Carone, Dawn M.
Mammalian embryonic stem cells (ESCs) and sperm exhibit unusual chromatin packaging that plays important roles in cellular function. Here, we extend a recently developed technique, based on deep paired-end sequencing of lightly digested chromatin, to assess footprints of nucleosomes and other DNA-binding proteins genome-wide in murine ESCs and sperm. In ESCs, we recover well-characterized features of chromatin such as promoter nucleosome depletion and further identify widespread footprints of sequence-specific DNA-binding proteins such as CTCF, which we validate in knockdown studies. We document global differences in nuclease accessibility between ESCs and sperm, finding that the majority of histone retention in sperm preferentially occurs in large gene-poor genomic regions, with only a small subset of nucleosomes being retained over promoters of developmental regulators. Finally, we describe evidence that CTCF remains associated with the genome in mature sperm, where it could play a role in organizing the sperm genome.
An Asymptotic Limit of a Navier-Stokes System with Capillary Effects
(2014-07-01)
Juengel, Ansgar
;
Lin, Chi-Kun
;
Wu, Kung-Chien
;
應用數學系
;
數學建模與科學計算所(含中心)
A combined incompressible and vanishing capillarity limit in the barotropic compressible Navier-Stokes equations for smooth solutions is proved. The equations are considered on the two-dimensional torus with well prepared initial data. The momentum equation contains a rotational term originating from a Coriolis force, a general Korteweg-type tensor modeling capillary effects, and a density-dependent viscosity. The limiting model is the viscous quasi-geostrophic equation for the "rotated" velocity potential. The proof of the singular limit is based on the modulated energy method with a careful choice of the correction terms.
Fast Charging and High Efficiency Switching-Based Charger With Continuous Built-In Resistance Detection and Automatic Energy Deliver Control for Portable Electronics
(2014-07-01)
Huang, Tzu-Chi
;
Peng, Ruei-Hong
;
Tsai, Tsu-Wei
;
Chen, Ke-Horng
;
Wey, Chin-Long
The continuous built-in resistance detection (CBIRD) is proposed in the switching-based charger system to achieve fast charging. Corresponding to built-in resistance (BIR) variation of Li-ion battery and charging current limitation from input energy, the CBIRD dynamically adjusts the transition voltage at the constant current (CC) mode. As a result, the transition timing from CC mode to the constant voltage (CV) mode can be postponed. Rated large charging current and extended period in CC mode effectively reduce charging time. Besides, the proposed automatic energy deliver control (AEDC) technique considers both loading system and battery status simultaneously to manage charging current according to the loading system\'s requirement and input supply energy for high efficiency charging. The proposed switching-based charger system was fabricated in 0.25 m CMOS process and occupied 3 mm(2) silicon area. The charger system can save up to 40% of charging time. The charger system achieves 87% of peak power efficiency at a rated 1 A charging current.
Box-Cox Transformation Approach for Evaluating Non-Normal Processes Capability Based on the C-pk Index
(2014-07-01)
Wu, C. H.
;
Lin, S. J.
;
Yang, D. L.
;
Pearn, W. L.
;
工業工程與管理學系
In manufacturing quality control and operations management, the process yield plays an important role. The capability index C-pk provides a lower bound on the process yield under the assumption that the process characteristic is normally distributed. When the normality assumption is violated, we can transform the non-normal data into normal data by using an appropriate transformation approach. In this paper, we consider the Box-Cox transformation and compare two estimation methods including the maximum likelihood estimator (MLE) and the method of percentiles (MOP). The performance comparison is based on the coverage rate, the precision, and the accuracy of the process non-conformity percentage evaluation. For various sample sizes and various distributions, several figures are presented to compare these two methods.
Affiliation and professionalism: Alternative perspectives on decomposing the board structures of financial institutions
(2014-07-01)
Yeh, Yin-Hua
;
Shu, Pei-Gi
;
Chiang, Tsui-Lin
;
資訊管理與財務金融系註：原資管所+財金所
;
Department of Information Management and Finance
Most financial institutions around the world are under concentrated ownership. To protect rents and the private benefits of control, controlling owners prefer to include more affiliated members on their boards. This study empirically examines financial institutions in Taiwan a country that harbors both firms with controlling shareholders and pyramidal groups and its results verify the aforementioned postulation. We find that board affiliation is positively associated with control rights, cash flow rights and the control/cash flow deviation associated with controlling owners. In contrast, professionalism can disentangle controlling owners\' motives, as it is positively associated with the controlling-owner cash flow/control rights ratio and negatively correlated with the control/cash flow deviation. The results support the incentive effect associated with controlling owners. Moreover, the information argument provides auxiliary explanations for how boards are structured. Family is a catalyst for the bias toward lower levels of board professionalism. Finally, whereas board professionalism is positively correlated with stock returns during a financial crisis, board affiliation has a negative correlation. (C) 2014 Elsevier Inc. All rights reserved.
Investigating possible gravity change rates expected from long-term deep crustal processes in Taiwan
(2014-07-01)
Mouyen, M.
;
Simoes, M.
;
Mouthereau, F.
;
Masson, F.
;
Hwang, C.
We propose to test if gravimetry can prove useful in discriminating different models of long-term deep crustal processes in the case of the Taiwan mountain belt. We discuss two existing tectonic models that differ in the deep processes proposed to sustain the long-term growth of the orogen. One model assumes underplating of the uppermost Eurasian crust with subduction of the deeper part of the crust into the mantle. The other one suggests the accretion of the whole Eurasian crust above crustal-scale ramps, the lower crust being accreted into the collisional orogen. We compute the temporal gravity changes caused only by long-term rock mass transfers at depth for each of them. We show that the underplating model implies a rate of gravity change of -6 x 10(-2) mu Gal yr(-1), a value that increases to 2 x 10(-2) mu Gal yr(-1) if crustal subduction is neglected. If the accretion of the whole Eurasian crust occurs, a rate of 7 x 10(-2) mu Gal yr(-1) is obtained. The two models tested differ both in signal amplitude and spatial distribution. The yearly gravity changes expected by long-term deep crustal mass processes in Taiwan are two orders of magnitude below the present-day uncertainty of land-based gravity measurements. Assuming that these annually averaged long-term gravity changes will linearly accumulate with ongoing mountain building, multidecadal time-series are needed to identify comparable rates of gravity change. However, as gravity is sensitive to any mass redistribution, effects of short-term processes such as seismicity and surface mass transfers (erosion, sedimentation, ground-water) may prevent from detecting any long-term deep signal. This study indicates that temporal gravity is not appropriate for deciphering the long-term deep crustal processes involved in the Taiwan mountain belt.
Photoresponsive Protein-Graphene-Protein Hybrid Capsules with Dual Targeted Heat-Triggered Drug Delivery Approach for Enhanced Tumor Therapy
(2014-07-01)
Hu, Shang-Hsiu
;
Fang, Ren-Hong
;
Chen, Yu-Wei
;
Liao, Bang-Jie
;
Chen, I-Wei
A novel photo-responsive protein-graphene-protein (PGP) capsule that doubles as a photothermal agent with core/shell structure is constructed by anchoring reduced graphene oxide nanosheets on one-component protein (lactoferrin) shell through a double emulsion method. PGP capsules can transport fully concealed hydrophilic anticancer cargo, doxorubicin (Dox), with a large payload (9.43 mu mol g(-1)) to be later unloaded in a burst-like manner by photo-actuation triggered by near-infrared irradiation. Being bio-compatible yet with a high cancer cell targeting efficiency, PGP capsules have successfully eradicated subcutaneous tumors in 10 d following a single 5 min NIR irradiation without distal damage. Besides, the photochemothermal therapy of PGP capsules eradicates tumor cells not only in the light-treating area but also widely light-omitted tumor cells, overcoming the tumor recurrence due to efficient cell killing efficacy. These results demonstrate that the PGP capsule is a potential new drug delivery platform for local-targeting, on-demand, photoresponsive, combined chemotherapy/hyperthermia for tumor treatment and other biomedical applications.
可容忍閘極崩毀之功率閘結構
(2014-07-01)
楊皓義
;
莊景德
;
黃威
本發明提供一種可容忍閘極崩毀之功率開關結構，其連接於一靜態隨機存取記憶體，功率閘結構包含第一互補式金氧半電晶體(CMOS)開關及第二互補式金氧半電晶體(CMOS)開關，兩者為不同閘極厚度或不同臨界電壓，利用正常閘極厚度或正常臨界電壓提供靜態隨機存取記憶體從睡眠模式或待機模式切換至啟動模式所需之電流；利用較厚的閘極厚度或較高臨界電壓提供予靜態隨機存取記憶體在工作模式所需之電流，藉以避免功率開關閘極崩毀的發生，進而影響靜態隨機存取記憶體的雜訊增益邊界、穩定性與效能。