Browsing by Issue Date, starting with "2016-05-10"

Now showing 1 - 20 of 17312

Security approach to controlling access to personal health records in healthcare service
(2016-05-10)
Chen, Tzer-Long
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Liao, Yu-Ting
;
Chang, Yi-Fan
;
Hwang, Jen-Hung
;
管理科學系
The changing information technology and the constant progress of medical technologies have gradually changed traditional paper-based medical records into low-cost electronic health records. The broad application of electronic health records allows a medical information exchange model being developed, called personal health records (PHR), which are the personal health medical information managed and maintained by the user. In consideration of PHR being a patient's health medical information, the privacy setting and the access authority have to be strictly controlled. In addition to providing users with reasonable access authorities, the PHR system has to avoid the illegal access of unauthorized single users or groups. The idea of public-key cryptosystems and Lagrange interpolating polynomial is applied to construct a high-security and efficient encryption scheme so that PHR users could execute the access system in a secure environment. Copyright (c) 2015 John Wiley & Sons, Ltd.
Well-Organized Mesoporous TiO2 Photoanode by Using Amphiphilic Graft Copolymer for Efficient Perovskite Solar Cells
(2016-05-12)
Chung, Chih-Chun
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Lee, Chang Soo
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Jokar, Efat
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Kim, Jong Hak
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Diau, Eric Wei-Guang
The control of the thickness and porosity of a mesoporous TiO2 layer is important to improve the photovoltaic performance of perovskite solar cells. We produced organized mesoporous TiO2 (om-TiO2) layers using a low-cost amphiphilic graft copolymer, poly(vinyl chloride)-graft-poly(oxyethylene methacrylate) (PVC-g-POEM), as a sacrificial template. This simple but effective synthetic approach generates highly mesoporous and well-organized TiO2 nanostructures with interconnected and size-tunable features. Specifically, the average pore size increased with the amount of hydrophobic PVC main chain in the graft copolymer, which acted as the pore forming agent. Perovskite layers were prepared on top of an om-TiO2 layer according to a two-step sequential deposition: after coating the PbI2, solution in dimethylformamide (DMF) on an om-TiO2 substrate, the substrate was prewetted in isopropyl alcohol (IPA) solvent before immersing into a CH3NH3I/IPA solution. This prewetting treatment not only improves the yields of conversion from PbI2, to CH3NH3PbI3, but also increases the size of perovskite crystals with cuboid morphology. On varying the pore size and the film thickness of the om-TiO2 layer, the device performance attained 11.9% of power conversion efficiency (PCE) at pore size 70 nm and film thickness 300 nm. We measured extracted charge densities and decays of transient photovoltage to understand the kinetics of charge recombination in relation to the corresponding device performance.
整形行不行
(2016-05-15)
羅宛君
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Department of Communication and Technology
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傳播與科技學系
整形暗藏的危險必須納入考量當中。
蘋果咬壹口　巨獸變多大
(2016-05-15)
劉敏慈
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Department of Communication and Technology
;
傳播與科技學系
今年三月，時代力量舉行反媒體壟斷公聽會，學者們反應可以成立「媒體多元發展基金會」，提升內容品質。
罰進延長賽　人社整治環工
(2016-05-15)
姚煒哲
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Department of Communication and Technology
;
傳播與科技學系
五月十日星期二，系際盃第十場比賽由交大人社系對上交大環工所，最後人社系以些微差距力挫環工所。
森林±2℃
(2016-05-15)
鄭淇云
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Department of Communication and Technology
;
傳播與科技學系
以圖表簡介森林的重要性，以及森林退化對環境的影響。
台灣狗醫生　動物輔助治療
(2016-05-15)
許心如
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Department of Communication and Technology
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傳播與科技學系
狗醫生現身臺北市天母國小校慶運動會，透過動物輔助活動及治療帶給病人溫暖，讓狗醫生為你診療吧！
從興趣出發　女孩創業保初衷
(2016-05-15)
王聖安
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Department of Communication and Technology
;
傳播與科技學系
蔡芷姍自幼喜歡花草，大學畢業後結合興趣，創立了保養品牌。
烏克麗麗嘉年華　奏響巨城
(2016-05-15)
徐義薇
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Department of Communication and Technology
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傳播與科技學系
紀錄第八屆台灣烏克麗麗嘉年華。
人道主義　帶起義築風氣
(2016-05-15)
黃琪
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Department of Communication and Technology
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傳播與科技學系
二〇〇九年由北科大建築系學生所發起的果核再生計畫，期望將其所學回饋社會、幫助偏鄉。
另類媒體知多少
(2016-05-15)
許人文
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Department of Communication and Technology
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傳播與科技學系
近年來，許多另類媒體受到關注，你對另類媒體的認識有多少？
獨居　不遺世而獨居
(2016-05-15)
謝萱穎
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Department of Communication and Technology
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傳播與科技學系
年老的長者獨居，並非獨立居住，而是獨自居住。獨自居住的他們，需要更多家人的關心、社會的祝福與陪伴。
定格動畫介紹
(2016-05-15)
梅瑞庭
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Department of Communication and Technology
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傳播與科技學系
簡單介紹定格動畫。
Au-decorated GaOOH nanorods enhanced the performance of direct methanol fuel cells under light illumination
(2016-05-15)
Hsu, Yi-Han
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Nguyen, An T.
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Chiu, Yi-Hsuan
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Li, Jing-Mei
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Hsu, Yung-Jung
We reported for the first time that GaOOH nanorods, which were prepared using a facile chemical precipitation method, may display noticeable photocatalytic activities toward methanol oxidation under light illumination, a significant revelation for demonstrating their use as the anode photocatalyst in the half cell reaction of direct methanol fuel cells (DMFCs). The GaOOH nanorods were further decorated with Au nanoparticles to endow them with increasingly pronounced charge separation, which conduced to a remarkable enhancement in the photocatalytic performance. Time-resolved photoluminescence spectroscopy was employed to depict the charge transfer event across the interface of GaOOH/Au, from which a correlation between photocatalytic efficiency and interfacial charge dynamics was realized. By incorporating GaOOH nanorods into the traditional Pt-catalyzed half-cell reaction, a 12.7% increase in anodic current generation can be attained under light illumination, demonstrating the promising potential of GaOOH as a practical anode photocatalyst in DFMCs. A further enhancement in methanol oxidation current up to 70.8% can be achieved by employing Au-decorated GaOOH nanorods, which was attributed to the efficient charge carrier transfer rendered by the Au decoration. The current study delivers both fundamental and practical importance as it broadens the scope of electrocatalysts for fuel cells, specifically by introducing a new class of highly efficient photocatalysts for promoting electrochemical reactions. (C) 2015 Elsevier B.V. All rights reserved.
遊戲付費史　免費的陷阱
(2016-05-15)
周書賢
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Department of Communication and Technology
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傳播與科技學系
介紹遊戲付費機制的演進。
GPS Height Variations Affected by Ocean Tidal Loading Along the Coast of Taiwan
(2016-05-15)
Chung, Y. D.
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Yeh, Ta-Kang
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Xu, G.
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Chen, C. S.
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Hwang, C.
The Global Positioning System (GPS) uses static relative positioning to mitigate common errors and has the ability to remove the effects of ocean tidal loading (OTL). OTL effects cannot be completely removed by increasing the baseline length during GPS data processing and must be corrected with OTL models, especially in Taiwan, which is surrounded by the ocean. In this paper, we collected GPS data from ten stations that are located along the coast of Taiwan. The periodic effect of OTL is discussed through a wavelet analysis and a harmonic analysis. We also calculated the amplitudes and phases of the semi-diurnal and diurnal tides to understand the effect of OTL on the GPS heights along the coast of Taiwan. The GPS data were divided into short-term (1 month) and long-term (2 years) categories and were calculated using the Bernese 5.0 software. The tidal data and the GPS heights were transferred into a wavelet spectrum for analysis. We found that in the tidal data, the periodic M2 signal was stronger than the K1 signal, which was not the case for the GPS height data. This result indicated that the common errors were not completely removed from the GPS heights and that the corresponding period was approximately 1 day, which might result in a stronger K1 signal. Moreover, five OTL models were chosen and compared in this case. Although the GPS heights with different OTL corrections were very similar, NAO. 99b was the best fitting model for the ocean around Taiwan. Finally, we analyzed the tidal data and the M2 amplitudes and phases of the GPS heights using a harmonic analysis and compared the results with the NAO. 99b model. The comparison indicated that the best agreement occurred in southwestern Taiwan and that the poorest agreement occurred in southeastern Taiwan with a maximum error of 0.3 cm. The phase results showed that the OTL model overlapped with the tidal data in the open ocean around central Taiwan, and both the GPS heights and the heights from the OTL model were 1.5 to 2 h earlier than the tidal data.
舞前舞後　熱情與羈絆
(2016-05-15)
林儒均
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Department of Communication and Technology
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傳播與科技學系
除了舞台上的表演外，舞者們追求的是對於跳舞的熱愛，以及與夥伴同甘共苦的回憶。
Analog-to-Digital Conversion Using Sub-Nyquist Sampling Rate in Flexible Delay-Division Multiplexing OFDMA PONs
(2016-05-15)
Wei, Chia-Chien
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Liu, Huan-Ching
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Lin, Chun-Ting
;
Chi, Sien
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光電系統研究所
This paper details a delay-division multiplexing (DDM) scheme for orthogonal frequency-division multiple access (OFDMA) passive optical networks (PONs). Unlike detection in a conventional OFDMA PON, the detection of OFDM signals in the proposed scheme involves an analog-to-digital converter (ADC) operating at a sampling rate below the Nyquist rate for each optical network unit (ONU). Based on preallocated relative time delays among the ONUs, preprocessed signals sent from an optical line terminal can be detected as different downstream signals following spectral aliasing caused by ADCs operating at a sub-Nyquist sampling rate. It should be noted that the proposed scheme reduces the requirement of sampling rate, but not the analog bandwidth of an ADC, such that all sent subcarriers can be retained before spectral aliasing. Thus, the proposed DDM scheme can reduce computational complexity and power consumption in the demodulation process, leading to an improvement in cost efficiency. In experiments, we demonstrate that each ONU with an ADC operating at 1/2-1/32 of the Nyquist sampling rate is able to receive 1/2-1/32 of the downstream data, with an insignificant performance penalty. Furthermore, in the DDM scheme, the sampling instant of an ADC is a key parameter in the selection of required data. This paper also proposes a method for estimating the adjustments required in the sampling instant at ONUs. The proposed method is based on the use of deviations in the channel response, which provides the ability to identifywith a high degree of precision the adjustments required for an ADC with sub-Nyquist sampling rate. Estimation error associated with the necessary adjustments has only negligible effects on performance, thereby confirming the reliability of the proposed method.
宋啦　宋朝人吃什麼
(2016-05-15)
張家瑋
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Department of Communication and Technology
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傳播與科技學系
宋朝人吃都吃些什麼，你吃過嗎？
旅行　生活的態度
(2016-05-15)
孔婉寧
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Department of Communication and Technology
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傳播與科技學系
有一種旅行的形式是獨自一人背著背包，帶著為數不多的錢財與衣物，到外地流浪一段時間。