Browsing by Issue Date, starting with "2014-03-31"

Now showing 1 - 20 of 27118

A New Reference Pixel Prediction for Reversible Data Hiding with Reduced Location Map
(2014-03-31)
Chen, Jeanne
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Chen, Tung-Shou
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Hong, Wien
;
Horng, Gwoboa
;
Wu, Han-Yan
In this paper, a new reversible data hiding method based on a dual binary tree of embedding levels is proposed. Four neighborhood pixels in the upper, below, left and right of each pixel are used as reference pixels to estimate local complexity for deciding embeddable and non- embeddable pixels. The proposed method does not need to record pixels that might cause underflow, overflow or unsuitable for embedment. This can reduce the size of location map and release more space for payload. Experimental results show that the proposed method is more effective in increasing payload and improving image quality than some recently proposed methods.
Investigation of channel width-dependent threshold voltage variation in a-InGaZnO thin-film transistors
(2014-03-31)
Liu, Kuan-Hsien
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Chang, Ting-Chang
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Wu, Ming-Siou
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Hung, Yi-Syuan
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Hung, Pei-Hua
This Letter investigates abnormal channel width-dependent threshold voltage variation in amorphous indium-gallium-zinc-oxide (a-IGZO) thin-film transistors. Unlike drain-induced source barrier lowering effect, threshold voltage increases with increasing drain voltage. Furthermore, the wider the channel, the larger the threshold voltage observed. Because of the surrounding oxide and other thermal insulating material and the low thermal conductivity of the IGZO layer, the self-heating effect will be pronounced in wider channel devices and those with a larger operating drain bias. To further clarify the physical mechanism, fast IV measurement is utilized to demonstrate the self-heating induced anomalous channel width-dependent threshold voltage variation. (C) 2014 AIP Publishing LLC.
Highly efficient porphyrin-sensitized solar cells with enhanced light harvesting ability beyond 800 nm and efficiency exceeding 10%
(2014-04-01)
Wang, Chin-Li
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Hu, Jyun-Yu
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Wu, Cheng-Hua
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Kuo, Hshin-Hui
;
Chang, Yu-Cheng
A new porphyrin sensitizer, LD31, was designed based on a donorp- pi-acceptor structure, in which an ethynyl-anthracenyl moiety was inserted between the dioctylaminophenyl group and the porphyrin core in order to extend the p-conjugation of the dye for improved light-harvesting ability. The device made of LD31 exhibited panchromatic spectral features covering the whole visible region and further extending over 800 nm. When combined with an organic dye (AN-4), the performance of the LD31/AN-4 co-sensitized device attained JSC/ mA cm(-2) = 20.3, VOC/mV = 704, FF = 0.72, and the overall efficiency of power conversion eta=10.3%.
可溶性二甲基矽氧烷修飾之聚（２－羥基乙基丙烯酸甲酯－甲基丙烯酸）雙性共聚物及其製備方法
(2014-04-01)
劉典謨
;
黃筠淳
;
許仲育
本發明係揭露一種可溶性二甲基矽氧烷修飾之聚(2-羥基乙基丙烯酸甲酯-甲基丙烯酸)雙性共聚物及其製備方法，其係基於2-羥基乙基丙烯酸甲酯(HEMA)、甲基丙烯酸(MAA)和末端3-丙基胺聚二甲基矽氧烷(PDMS)以化學鍵結方式在水溶液中合成。此可溶性二甲基矽氧烷修飾之聚(2-羥基乙基丙烯酸甲酯-甲基丙烯酸)雙性共聚物更可完全溶於醇類溶劑，以利後續之加工需求，並具可調整之親疏水性及良好的生物相容性，故可應用於防沾附或藥物釋放等之應用。
Performance evaluation of a tube-in-tube CO2 gas cooler used in a heat pump water heater
(2014-04-01)
Yu, Pei-Yu
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Lin, Wei-Keng
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Wang, Chi-Chuan
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機械工程學系
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Department of Mechanical Engineering
In this study, investigation of the performance of a tube-in-tube counter-flow water-cooled CO2 gas cooler operating above and near critical pressure is presented using a heat pump water heater with CO2 flowing in the annulus side. A tube-in-tube heat exchanger model applicable for supercritical fluid CO2 and water was also developed and validated. The measured total heat transfer capacity ranged from 1.31 to 4.06 kW at various test conditions. The calculations show good agreement with the experimental results. The results demonstrate that the variation of CO2 temperature tends to show very slow decreasing near the pseudo-critical region when compared to the inlet region. Yet this phenomenon becomes more pronounced as the inlet pressure is close to the critical pressure (73.8 bar). The calculation also reveals a peculiar phenomenon that the local heat transfer rate of the heat exchanger peaks within the heat exchanger near the pseudo critical region due to the drastic rise of specific heat (C-p value). (C) 2014 Elsevier Inc. All rights reserved.
兩種紫藤，或一種迷戀雷奈／費里尼電影的人（A Resnais-Fellini Aficionado）對《劇場》（雜誌及其編輯群、作者群）的深情記憶與永恆感恩
(深河出版有限公司, 2014-04-01)
李幼鸚鵡鵪鶉
Clean energy, non-clean energy, and economic growth in the MIST countries
(2014-04-01)
Pao, Hsiao-Tien
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Li, Yi-Ying
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Fu, Hsin-Chia
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管理科學系
;
Department of Management Science
This paper explores the causal relationship between clean (renewable/nuclear) and non-clean energy consumption and economic growth in emerging economies of the MIST (Mexico, Indonesia, South Korea, and Turkey) countries. The panel co-integration tests reveal that there is a long-term equilibrium relationship among GDP, capital formation, labor force, renewable/nuclear, and fossil fuel energy consumption. The panel causality results indicate that (1) there is a positive unidirectional short-run causality from fossil fuel energy consumption to economic growth with a bidirectional long-run causality; (2) there is a unidirectional long-run causality from renewable energy consumption to economic growth with positive bidirectional short-run causality, and a long-run causality from renewable to fossil fuel energy consumption with negative short-run feedback effects; and (3) there is a bidirectional long-run causality between nuclear energy consumption and economic growth and a long-run causality from fossil fuel energy consumption to nuclear energy consumption with positive short-run feedback effects. These suggest that MIST countries should be energy-dependent economies and that energy conservation policies may depress their economic development. However, developing renewable and nuclear energy is a viable solution for addressing energy security and climate change issues, and creating clean and fossil fuel energy partnerships could enhance a sustainable energy economy. (c) 2014 Elsevier Ltd. All rights reserved.
A New Secure Image Transmission Technique via Secret-Fragment-Visible Mosaic Images by Nearly Reversible Color Transformations
(2014-04-01)
Lee, Ya-Lin
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Tsai, Wen-Hsiang
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交大名義發表
;
National Chiao Tung University
A new secure image transmission technique is proposed, which transforms automatically a given large-volume secret image into a so-called secret-fragment-visible mosaic image of the same size. The mosaic image, which looks similar to an arbitrarily selected target image and may be used as a camouflage of the secret image, is yielded by dividing the secret image into fragments and transforming their color characteristics to be those of the corresponding blocks of the target image. Skillful techniques are designed to conduct the color transformation process so that the secret image may be recovered nearly losslessly. A scheme of handling the overflows/underflows in the converted pixels' color values by recording the color differences in the untransformed color space is also proposed. The information required for recovering the secret image is embedded into the created mosaic image by a lossless data hiding scheme using a key. Good experimental results show the feasibility of the proposed method.
Effect of annealing processes on the electrical properties of the atomic layer deposition Al2O3/In0.53Ga0.47As metal oxide semiconductor capacitors
(2014-04-01)
Quang-Ho Luc
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Chang, Edward Yi
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Trinh, Hai-Dang
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Hong-Quan Nguyen
;
Binh-Tinh Tran
The influence of different annealing processes including post deposition annealing (PDA) and post metallization annealing (PMA) with various temperatures (250-400 degrees C) and ambient [N-2 and forming gas (FG)] on the electrical characteristics of Pt/Al2O3/In0.53Ga0.47As MOSCAPs are systemically studied. Comparing to samples underwent high PDA temperature, the higher leakage current has been observed for all of samples underwent high PMA temperature. This has resulted in the degradation of capacitance-voltage (C-V) behaviors. In conjunction with the current-voltage (J-V) measurement, depth profiling Auger electron spectroscopy (AES) and high-resolution transmission electron microscopy (HRTEM) analyses evidence that the out-diffusion of metal into oxide layer is the main source of leakage current. The noticeable passivation effect on the Al2O3/InGaAs interface has also been confirmed by the samples that underwent PDA process. (C) 2014 The Japan Society of Applied Physics
降低氣體中硫化氫之系統與方法
(2014-04-01)
曾慶平
;
俞銘誠
;
陳煜沛
本發明係有關於一種降低氣體中硫化氫之系統與方法，該系統包括：一生物過濾單元，其係接收一氣體，該氣體係包含硫化氫，且該生物過濾單元係轉換該氣體中之硫化氫以產生一產物；一循環水儲存單元，其係接收來自該生物過濾單元之該產物，並形成包含該產物之一液體；以及一循環水再生單元，其係接收來自該循環水儲存單元之該液體，且該循環水再生單元係進行水純化反應，並移除該產物；其中，該產物係為一酸性之水溶性產物，且自該循環水再生單元產生之水係進入該循環水儲存單元。
非西歐殖民地經歷與亞洲主義的幽靈
(深河出版有限公司, 2014-04-01)
崔元植
;
王艷麗
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白池雲
瑣憶《劇場》時代
(深河出版有限公司, 2014-04-01)
莊靈
Implementation of a Model-Tracing-Based Learning Diagnosis System to Promote Elementary Students' Learning in Mathematics
(2014-04-01)
Chu, Yian-Shu
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Yang, Haw-Ching
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Tseng, Shian-Shyong
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Yang, Che-Ching
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資訊工程學系
Of all teaching methods, one-to-one human tutoring is the most powerful method for promoting learning. To achieve this aim and reduce teaching load, researchers developed intelligent tutoring systems (ITSs) to employ one-to-one tutoring (Aleven, McLaren, & Sewall, 2009; Aleven, McLaren, Sewall, & Koedinger, 2009; Anderson, Corbett, Koedinger, & Pelletier, 1995; Anderson & Reiser, 1985; Blessing, Gilbert, Ourada, & Ritter, 2009; Mitrovic et al., 2009; Mitrovic & Ohlsson, 1999; Suraweera, Mitrovic, & Martin, 2007; VanLehn et al., 2005). However, most ITSs have restricted user interfaces, which confine reasoning strategies of students during problem solving, thus ignoring the fact that students could use dissimilar strategies to solve a given question. Furthermore, student learning problems could be diagnosed from the derivation of their answers. In order to interpret students' mathematical problem-solving behaviors, this study developed a Model-tracing Intelligent Tutor (MIT) to diagnose students' learning problems and provide learning feedback for individual students. A quasi-experiment was conducted in an elementary school to evaluate the effectiveness of the proposed approach, in which 124 fifth graders participated. The experimental results show that the model-tracing-based learning diagnosis system is significantly more helpful to the students in learning mathematics than the conventional web-based test in terms of learning achievements.
「漂泊」中的「個體」力量－大陸當代青年的精神與知識狀況
(深河出版有限公司, 2014-04-01)
呂怡婷
從此他鄉亦長安
(深河出版有限公司, 2014-04-01)
王昱娟
Implementation of a Model-Tracing-Based Learning Diagnosis System to Promote Elementary Students\' Learning in Mathematics
(2014-04-01)
Chu, Yian-Shu
;
Yang, Haw-Ching
;
Tseng, Shian-Shyong
;
Yang, Che-Ching
;
資訊工程學系
Of all teaching methods, one-to-one human tutoring is the most powerful method for promoting learning. To achieve this aim and reduce teaching load, researchers developed intelligent tutoring systems (ITSs) to employ one-to-one tutoring (Aleven, McLaren, & Sewall, 2009; Aleven, McLaren, Sewall, & Koedinger, 2009; Anderson, Corbett, Koedinger, & Pelletier, 1995; Anderson & Reiser, 1985; Blessing, Gilbert, Ourada, & Ritter, 2009; Mitrovic et al., 2009; Mitrovic & Ohlsson, 1999; Suraweera, Mitrovic, & Martin, 2007; VanLehn et al., 2005). However, most ITSs have restricted user interfaces, which confine reasoning strategies of students during problem solving, thus ignoring the fact that students could use dissimilar strategies to solve a given question. Furthermore, student learning problems could be diagnosed from the derivation of their answers. In order to interpret students\' mathematical problem-solving behaviors, this study developed a Model-tracing Intelligent Tutor (MIT) to diagnose students\' learning problems and provide learning feedback for individual students. A quasi-experiment was conducted in an elementary school to evaluate the effectiveness of the proposed approach, in which 124 fifth graders participated. The experimental results show that the model-tracing-based learning diagnosis system is significantly more helpful to the students in learning mathematics than the conventional web-based test in terms of learning achievements.
以身為學，苑裡反瘋車教我的事
(深河出版有限公司, 2014-04-01)
林沁
Are there more almost separable partitions than separable partitions?
(2014-04-01)
Chang, Fei-Huang
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Chen, Hong-Bin
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Hwang, Frank K.
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應用數學系
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Department of Applied Mathematics
A partition of a set of n points in d-dimensional space into p parts is called an (almost) separable partition if the convex hulls formed by the parts are (almost) pairwise disjoint. These two partition classes are the most encountered ones in clustering and other partition problems for high-dimensional points and their usefulness depends critically on the issue whether their numbers are small. The problem of bounding separable partitions has been well studied in the literature (Alon and Onn in Discrete Appl. Math. 91:39-51, 1999; Barnes et al. in Math. Program. 54:69-86, 1992; Harding in Proc. Edinb. Math. Soc. 15:285-289, 1967; Hwang et al. in SIAM J. Optim. 10:70-81, 1999; Hwang and Rothblum in J. Comb. Optim. 21:423-433, 2011a). In this paper, we prove that for da parts per thousand currency sign2 or pa parts per thousand currency sign2, the maximum number of almost separable partitions is equal to the maximum number of separable partitions.
CIM: Community-Based Influence Maximization in Social Networks
(2014-04-01)
Chen, Yi-Cheng
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Zhu, Wen-Yuan
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Peng, Wen-Chih
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Lee, Wang-Chien
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Lee, Suh-Yin
Given a social graph, the problem of influence maximization is to determine a set of nodes that maximizes the spread of influences. While some recent research has studied the problem of influence maximization, these works are generally too time consuming for practical use in a large-scale social network. In this article, we develop a new framework, community-based influence maximization (CIM), to tackle the influence maximization problem with an emphasis on the time efficiency issue. Our proposed framework, CIM, comprises three phases: (i) community detection, (ii) candidate generation, and (iii) seed selection. Specifically, phase (i) discovers the community structure of the network; phase (ii) uses the information of communities to narrow down the possible seed candidates; and phase (iii) finalizes the seed nodes from the candidate set. By exploiting the properties of the community structures, we are able to avoid overlapped information and thus efficiently select the number of seeds to maximize information spreads. The experimental results on both synthetic and real datasets show that the proposed CIM algorithm significantly outperforms the state-of-the-art algorithms in terms of efficiency and scalability, with almost no compromise of effectiveness.
Using detection of vehicular presence to estimate shockwave speed and upstream traffics for a signalized intersection
(2014-04-01)
Cho, Hsun-Jung
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Tseng, Ming-Te
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Hwang, Ming-Chorng
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運輸與物流管理系註：原交通所+運管所
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友訊交大聯合研發中心
Based on the Lighthill-Whitham-Richards (LWR) traffic flow theory, this paper provides alternative methods to compute shockwave speed mainly by using detection data that reflects three states of vehicular presences: vehicles in moving, vehicles stopped, and void of vehicles. As the duration of a state is firmly identified within a cycle, the proposed methods compute shockwave speeds directly by means of Euclidian geometrics on time-space trajectory of shockwaves. This approach is also applicable to congested signal links with a long queue (but a residual queue) beyond detection zone. In addition, given signal timing and the shockwave speeds calculated by the methods, characteristics of arrival traffics, i.e. upstream flow rate and speed, can be predicted before the end of current cycle. It justifies that the methods are capable of whether to extend green phase before next cycle or not and will be a promising tool for real-time operations of signal control. Finally, the predicted shockwave speeds, upstream flow rate, and space mean speed by the proposed method are testified using simulated data from CORSIM. The mean absolute percentage errors of the estimated speeds of forward recovery shockwave and backward forming shockwave are 4.0% and 12.4% respectively. For the predicted flow rate and space mean speed of downstream arrival traffics, the mean absolute percentage errors are 18% and 4%, respectively. The results demonstrate the effectiveness of the presented approach. (C) 2014 Elsevier Inc. All rights reserved.