Browsing by Issue Date, starting with "2016-12"

Now showing 1 - 20 of 16019

Energy-Efficient Joint Sensing Duration, Detection Threshold, and Power Allocation Optimization in Cognitive OFDM Systems
(2016-12)
Xu, Wenjun
;
Zhou, Xuemei
;
Lee, Chia-Han
;
Feng, Zhiyong
;
Lin, Jiaru
This paper investigates an energy efficiency optimization problem in cognitive orthogonal frequency division multiplexing systems. The goal is to maximize the energy efficiency by adapting the sensing duration, detection threshold, and transmit power to the constraints of the energy consumption of the secondary network and the interference to the primary network in a statistical manner. First, the case of identical detection threshold for all subcarriers is considered. In order to circumvent the intractability of the resulting problem, an alternate iteration framework is proposed to iteratively solve the three decoupled subproblems: sensing duration optimization, detection threshold optimization, and power allocation optimization. By exploiting the characteristics of each subproblem, the proposed framework is proved to be convergent. Then, the case with individual detection threshold for each subcarrier is explored. By proving that the optimal detection threshold is the root of a quadratic equation with one unknown variable, the proposed framework can be applied with minor modification. Simulation results show that the proposed alternating optimization framework can approach rapidly to the optimal solution, with less than 1% gap. Compared with the existing schemes, both the cases with identical and individual detection thresholds can achieve a considerable energy efficiency gain, with the latter further outperforming the former.
The impact of electrical contacts and contact-induced ultralow noise amplitudes in layered transistors
(2016-12)
Hsu, Chih-Kai
;
Lin, Chi-Yi
;
Li, Wenwu
;
Sun, Huabin
;
Xu, Yong
Electrical contacts made of conducting channels with external circuitry significantly impact electronic performances, in particular for two-dimensional semiconductors. This work presents a systematic study of back-to-back Schottky contacts to a layered compound of semiconducting flakes through static and dynamic electrical measurements and the first demonstration of Schottky barrier-dominated, p-type PbSnS2 field-effect transistors. In the static analysis, the Schottky barrier height of the layered transistors can be modulated by applied electrostatic fields, while the contact-dominated fluctuations render to the 1/f electric noise and induce a normalized noise amplitude in the order of 10(-9)-10(-8). Such an ultralow-noise amplitude, which is never observed in other layered semiconducting transistors, is ascribed to the existence of Schottky barriers. Our experimental results provide a nuanced perspective for advancing the understanding of performance limit with increasing numbers of layers for electronic development.
Simple median-based EP PP scheme for enhancement of reconstructed Bayer colour filter array images
(2016-12)
Yang, Yi-Hong
;
Wang, Peng-Hua
;
Chen, Po-Ning
;
電機工程學系
;
Department of Electrical and Computer Engineering
In this study, the median-based edge-preserving (EP) modification is revisited and has been shown to improve effectively the quality of a reconstructed Bayer colour filter array image in terms of the composite peak signal-to-noise ratio (CPSNR) performance index. Along this research direction, the authors propose an EP-modified signal-correlation-based (SCB) post-processing (PP), called EP-SCB, as an enhancement to any existing interpolation method. The Bayer image reconstruction system they consider thus consists of two operational phases. The first phase performs an initial estimation of the missing red, green and blue colours by using an existing interpolation method, whereas the second phase applies EP-SCB PP. Since a certain class of images may not fulfil the premise of having small variations in local colour difference, which is assumed by SCBtype interpolation, thereby resulting in a deterioration in CPSNR after EP-SCB PP, a threshold test on local variance ratio is also devised to conditionally switch off the second phase. Experimental results show that the EP-SCB PP with variance-ratio test gives a worst average CPSNR than the original interpolation methods tested in none of the Kodak and IMAX image groups experimented.
回到萬隆／第三世界國際主義的路上：「一帶一路」民間版二十年階段性報告
(深河出版有限公司, 2016-12-01)
陳光興
Aerosol-Assisted Plasma Deposition of Biocomposite Coatings: Investigation of Processing Conditions on Coating Properties
(2016-12)
Hsiao, Chun-Ping
;
Wu, Cheng-Chen
;
Liu, Yung-Hsin
;
Yang, Yi-Wei
;
Cheng, Yun-Chien
The aerosol-assisted atmospheric-pressure planar dielectric-barrier-discharge-type plasma deposition (AA-APPD) system can polymerize monomers and immobilize biomolecules simultaneously. In this paper, we used this technology to deposit biocomposite thin films of polyethylene (PE) along with lysozyme (Lyz) under different aerosol solution temperatures and at different coating positions in the discharge region. In addition, we compared the deposition efficacy of two kinds of Lyz solution using deionized (DI)-water and phosphate-buffered saline (PBS) as solvents, respectively. The results show that deposition rate of thin films increases with increasing solution temperature at most coating positions. In addition, coatings from Lyz-PBS perform higher deposition rates, but with weaker Lyz viability as compared with that of Lyz DI-water. Finally, we also verified that this DBD-type AA-APPD system can not only successfully deposit Lyz in PE thin film, but also maintain Lyz viability after plasma process under different solution temperatures and positions.
爺爺講的村子的歷史
(深河出版有限公司, 2016-12-01)
宋霞
Resolution enhancement of pump-probe microscopy with an inverse-annular spatial filter
(2016-12-01)
Kobayashi, T.
;
Kawasumi, K.
;
Miyazaki, J.
;
Nakata, K.
;
電子物理學系
We have introduced a pupil filter, an inverse-annular pupil filter in a pump-probe photothermal microscope, which provides resolution enhancement in three dimensions. The resolution is probed to be improved in lateral and axial resolution by imaging experiment using 20 nm gold nanoparticles. The improvement in X (perpendicular to the common pump and probe polarization direction), Y (parallel to the polarization direction), and Z (axial direction) are by 15 +/- 6, 8 +/- 8, and 21 +/- 2 % from the resolution without a pupil filter. The resolution enhancement is even better than the calculation using vector field, which predicts the corresponding enhancement of 11, 8, and 6 %. The discussion is made to explain the unexpected results. We also demonstrate the photothermal imaging of thick biological samples (cells from rabbit intestine and kidney) stained with hematoxylin and eosin dye with the inverse-annular filter. (C) 2016 Author(s).
莆田仙游紀行
(深河出版有限公司, 2016-12-01)
莫艾
A qualitative study on perceived value and loyalty: A moderated-mediation framework
(交通大學, 2016-12-01)
Cheng-Kai Chou
;
Mei-Liang Chen
This research conducts a qualitative study by proposing a conceptual framework that explains customer loyalty, as well as its mediators and moderator based on the signaling theory. The signaling theory was originally derived from information economics under conditions in which buyers and sellers possess asymmetric information during their interactions in the market. This study refers to perceived brand prestige as the underlying and unobservable signal that fulfills the needs or demands of consumers observing the signal. In the proposed framework of this study, loyalty is indirectly related to CSR disclosure quality and perceived brand prestige through the full mediation of customer satisfaction and desirable expectation of new products. Moreover, the relationship between customer satisfaction and loyalty and between desirable expectation of new products and loyalty are both moderated by perceived brand prestige. This study is a pioneer in proposing the desirable expectation of new products as a mediator and perceived brand prestige as a moderator in the loyalty formation. This study suggests that marketers successfully shaping brand prestige can reduce the mutable influence of customer satisfaction on loyalty, leading to stable loyalty. Lastly, managerial implications for marketers based on the propositions of this study are provided.
網球公開賽女子單打發球技能分析研究
(國立交通大學體育室, 2016-12-01)
邱豐傑
;
李鑑芸
;
詹益欣
;
Chiu Feng-Chieh
;
Chien-Yun Lee
目的：本研究主要目的為分析近三年世界女子職業網球選手在不同網球表面性質場地的發球技能之差異及發展，藉以了解現今世界職業女子網球發球技能之趨勢。方法：本研究是以參與2013-2015 三年間世界四大職業網球公開賽之進入女子32 強的選手做為研究對象、變異數分析比較三年間中9 項攻守技能表現之差異性。結果：1.2013-2015 勝負方之第一發球贏球率、第二發球贏球率及愛司球等技能差異均達顯著水準 (p＜.05)。2.四大網球公開賽競賽時勝負方各項發球技能表現分析後得知2013 年在第一發球成功率及愛司球，2014 年在第一發球贏球率、愛司球、發球最快速度、第一發球平均速度及第二發球平均速度，2015年在第一發球贏球率、第二發球贏球率、愛司球、發球最快速度、第一發球平均速度及第二發球平均速度等項目差異均達顯著水準 (p＜.05)。結論：研究結果顯示四大公開賽在發球贏球率方面是會影響勝負成績的關鍵表現，勝方球員均需具備有較高的第一及第二發球贏球率，獲勝的機率就會提高，而愛司球、第一及第二發球速度對速度較快的溫布頓場地表現更顯突出。
MINKOWSKI PRODUCT OF CONVEX SETS AND PRODUCT NUMERICAL RANGE
(2016-12)
Li, Chi-Kwong
;
Pelejo, Diane Christine
;
Poon, Yiu-Tung
;
Wang, Kuo-Zhong
;
應用數學系
Let K-1, K-2 be two compact convex sets in C. Their Minkowski product is the set K1K2 = {ab : a is an element of K-1, b is an element of K-2}. We show that the set K1K2 is star-haped if K-1 is a line segment or a circular disk. Examples for K-1 and K-2 are given so that K-1 and K-2 are triangles (including interior) and K1K2 is not star-shaped. This gives a negative answer to a conjecture by Puchala et. al concerning the product numerical range in the study of quantum information science. Additional results and open problems are presented.
Large-scale recommender system with compact latent factor model
(2016-12-01)
Liu, Chien-Liang
;
Wu, Xuan-Wei
;
資訊工程學系
;
工業工程與管理學系
;
Department of Computer Science
This work devises a factorization model called compact latent factor model, in which we propose a compact representation to consider query, user and item in the model. The blend of information retrieval and collaborative filtering is a typical setting in many applications. The proposed model can incorporate various features into the model, and this work demonstrates that the proposed model can incorporate context-aware and content-based features to handle context-aware recommendation and cold-start problems, respectively. Besides recommendation accuracy, a critical problem concerning the computational cost emerges in practical situations. To tackle this problem, this work uses a buffer update scheme to allow the proposed model to process data incrementally, and provide a means to use historical data instances. Meanwhile, we use stochastic gradient descent algorithm along with sampling technique to optimize ranking loss, giving a competitive performance while considering scalability and deployment issues. The experimental results indicate that the proposed algorithm outperforms other alternatives on four datasets. (C) 2016 Elsevier Ltd. All rights reserved.
Bubble characteristics in time periodic evaporation flow of R-134a in a narrow annular pipe due to heat flux oscillation
(2016-12)
Chen, C. A.
;
Lin, T. F.
;
Yan, Wei-Mon
;
機械工程學系
;
Department of Mechanical Engineering
In this work, bubble characteristics of periodic evaporation flow with refrigerant R-134a in a horizontal narrow annular pipe were examined experimentally in details. Attention is focused on the time periodic evaporation flow characteristics affected by the mean levels, amplitudes, and periods of the heat flux oscillation. The photos of the R-134a time periodic evaporating flow taken from the duct side are presented to show the change of the dominant two-phase flow pattern in the duct with the experimental parameters. The results show that at the low vapor quality, the bubbles get smaller with time and become less crowded in the duct in the first half of the cycle in which the R-134a heat flux decreases. The changes of the bubble characteristics with the instantaneous heat flux become more pronounced for an increase in the amplitude of the heat flux oscillation. At the very high mean vapor quality the bubble nucleation can be barely seen in the entire periodic cycle since the liquid film covering the heating surface is very thin. In addition, the duct flow is dominated by the annular two-phase flow at all time. (C) 2016 Elsevier Ltd. All rights reserved.
Overview of Screen Content Video Coding: Technologies, Standards, and Beyond
(2016-12)
Peng, Wen-Hsiao
;
Walls, Frederick G.
;
Cohen, Robert A.
;
Xu, Jizheng
;
Ostermann, Joern
This paper presents recent advances in screen content video coding, with an emphasis on two state-of-the-art standards: HEVC/H. 265 Screen Content Coding Extensions (HEVC-SCC) by ISO/IEC Moving Picture Experts Group and ITU-T Video Coding Experts Group, and Display Stream Compression (DSC) by Video Electronics Standards Association. The HEVC-SCC enhances the capabilities of HEVC in coding screen content, while DSC provides lightweight compression for display links. Although targeting different application domains, they share some design principles and are expected to become the leading formats in the marketplace in the coming years. This paper provides a brief account of their background, key elements, performance, and complexity characteristics, according to their final specifications. As we survey these standards, we also summarize prior arts in the last decade and explore future research opportunities and standards developments in order to give a comprehensive overview of this field.
電紡絲裝置
(2016-12-01)
徐瑞坤
;
黃宣諭
;
鄭耀鴻
一種電紡絲裝置，包含一收集單元、一驅動單元，及一紡料供應器，該收集單元包括一導引盤，及至少一收集棒，該導引盤定義一以其一軸心為圓心的設置圓弧，該收集棒與該設置圓弧相切地支持於該導引盤，該驅動單元提供動力驅動該收集單元而使該導引盤以該軸心轉動，且使該收集棒繞其一自身的長軸自身轉動，該紡料供應器與該收集單元具有高電壓差，當該紡料供應器經高壓電場作用朝該收集棒射出電紡絲，電紡絲纖維即沿該長軸平行排列地、或是交叉排列成菱格狀地被捲繞收集，進而製得管狀纖維支架。
大專初學高爾夫學生短推桿測驗成績與健康體適能之相關性研究
(國立交通大學體育室, 2016-12-01)
林彥均
;
Yen-Chun Lin
目的：本研究在了解健康體適能與大專初學高爾夫學生短推桿測驗成績之相關性。方法：本研究採實驗設計法，透過學習高爾夫運動課程的歷程，以未經過訓練的大專學生共291 人為本研究樣本，經12 週高爾夫球課程後，測驗高爾夫之短推桿成績的結果為基準，並同時施測健康體適能各項目，所得資料以SPSS12.0 統計軟體進行斯皮爾曼等級相關係數檢定分析各項體適能測驗項目與大專初學高爾夫學生短推桿測驗成績的相關性，再以多元逐步迴歸模式預測大專初學高爾夫學生短推桿測驗成績的體適能代表性項目。本研究顯著水準定為α＜=.05。結果：研究顯示健康體適能項目有仰臥起坐一項呈正相關；多元逐步迴歸分析後首先被選入的為仰臥起坐其次為立定跳遠；大專初學高) =85.435+0.244× (仰臥起坐) + 0.49× (立定跳遠) 多元逐步迴歸模式達顯著，大專初學高爾夫學生短推桿測驗成績的解釋力達0.4%。結論：本研究結論可以歸納說明，大專初學高爾夫學生短推桿測驗成績，與健康體適能的肌耐力與瞬發力有相關的運動。
The retention of customer relationships after mergers and acquisitions
(交通大學, 2016-12-01)
Chen-Yen Yao
;
Shari S. C. Shang
;
Yun-Chen Yu
Mergers and acquisitions (M&As) represent a strategic approach for businesses to acquire resources and build competitive advantages. Many studies have investigated the process and results of such resource integration between two firms. Some cases reveal satisfactory results in building asset portfolios, while others uncover downsides after M&As due to conflicts in cultural and system integration. Although the key M&A objective is to expand business operations in providing customers with superior products and services, limited understanding exists in regards to how companies retain the quality of post-merger customer relationships. The research questions of this study are: (1) Do enterprises retain the same quality of CRM after M&A? and (2) How do organizations retain the quality of Customer Relationship Management (CRM) after M&A? To answer the first research question, we collected data from eight banks that underwent M&As in Taiwan from 2004 to 2011, to examine their CRM performances. To answer the second question, we conducted five in-depth case studies from successful and failed CRM cases to understand the important factors about managing CRM during and after M&As. The results find critical and additional influential factors about maintaining and enhancing CRM quality after M&As. These results highlight the importance of measuring and managing CRM during and after a merger and contribute to organizations that plan to develop effective plans for building synergy in CRM after M&As.
從三個視點重新思考「安保法制」討論的立足點
(深河出版有限公司, 2016-12-01)
板垣雄三
;
王晶
An 8X-Parallelism Memory Access Reordering Polyphase Network for 60 GHz FBMC-OQAM Baseband Receiver
(2016-12-01)
Liu, Chun-Yi
;
Sie, Meng-Siou
;
Leong, Edmund Wen Jen
;
Yao, Yu-Cheng
;
Lopez, Henry
Filter bank multi-carrier (FBMC) is a kind of new waveform that is an important topic in 5th generation wireless systems (5G). In this paper, we propose a novel memory access reordering polyphase network (PPN) for FBMC offset QAM (OQAM) system at 60 GHz band. The novel PPN architecture has lower complexity than the state-of-the-art designs, and it can be used in any FBMC-OQAM baseband design. To evaluate the system performance and hardware complexity of baseband receiver in millimeter wave (mmW) band, the proposed PPN is integrated into our 8X-parallelism 60 GHz band baseband receiver. The out-of-band (OOB) radiation in fixed-point simulation has 25 dB improvement as compared with OFDM. Furthermore, the transmission efficiency of FBMC-OQAM baseband receiver can improve 52% due to using more data subcarriers and removal of cyclic prefix (CP). The proposed PPN is synthesized with 40 nm 1P9M general purposes (GP) process, and can operate at 330/500 MHz clock rate with power consumption of 17/26 mW, providing the maximum PHY data rate up to 21.4 Gb/s.
The equilibrium contract rent and reward money under incomplete information in reverse supply chains: A game theoretical approach and computational study
(2016-12)
Hong, I-Hsuan
;
Dang, Jr-Fong
;
Lin, Kuan-Wen
;
工業工程與管理學系
;
Department of Industrial Engineering and Management
Many electronic end-of-life (EOL) products are becoming obsolete sooner due to advances in technology. Hence, manufacturers hire third-party recyclers as subcontractors to recycle brand-name products. A complicated profile of recycling EOL products adds a significant cost burden to the third-party recyclers, while only the manufacturer has a superior understanding of the profile of recycling EOL products (homogeneity degree of EOL products). This paper describes the decision of the manufacturer and the third-party recycler in reverse supply chains under incomplete information of product homogeneity, which affects the unit profit of recycled products. The supply chain model assumes that customers receive reward money for returning obsolete products, and that the manufacturer as a leader and the third-party recycler as a follower determine the contract rent offered to the third-party recycler and the reward money paid to customers, respectively. Both the manufacturer and third-party recycler want to maximize their profit functions. We propose a game theoretical approach to search for the equilibrium contract rent for the third-party recycler and the equilibrium reward money for customers returning products for recycling. We conclude with a discussion of the impact of the contract rent and reward money on the equilibrium solution. (C) 2016 Published by Elsevier Ltd.