Browsing by Issue Date, starting with "2019-11-02"

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UniChain: A Design of Blockchain-Based System for Electronic Academic Records Access and Permissions Management
(2019-11-02)
Daraghmi, Eman-Yasser
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Daraghmi, Yousef-Awwad
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Yuan, Shyan-Ming
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資訊工程學系
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Department of Computer Science
Although blockchain technology was first introduced through Bitcoin, extending its usage to non-financial applications, such as managing academic records, is a new mission for recent research to balance the needs for increasing data privacy and the regular interaction among students and universities. In this paper, a design for a blockchain-based system, namely UniChain, for managing Electronic Academic Records (EARs) is proposed. UniChain is designed to improve the current management systems as it provides interoperable, secure, and effective access to EARs by students, universities, and other third parties, while keeping the students' privacy. UniChain employs timed-based smart contracts for governing transactions and controlling access to EARs. It adopts advanced encryption techniques for providing further security. This work proposes a new incentive mechanism that leverages the degree of universities regarding their efforts on maintaining academic records and creating new blocks. Extensive experiments were conducted to evaluate the UniChain performance, and the results indicate the efficiency of the proposal in handling a large dataset at low latency.
從《阿拉丁》改編看新時代女性覺醒
(2019-11-03)
徐曼寧
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Department of Communication and Technology
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傳播與科技學系
《阿拉丁》是迪士尼少數獲得觀眾好評的動畫真人版改編電影，其中角色的改編正是成功的關鍵。
獨自盛開的決心　高嶺之花
(2019-11-03)
李芝謙
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Department of Communication and Technology
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傳播與科技學系
什麼？！這是石原聰美的最後一部愛情劇？看日本超人氣女星石原聰美扮演的花道天才，如何用強大氣場，將你一把跩進萬花筒般的花花世界！
別讓嘴巴「吃掉」你的健康！
(2019-11-03)
吳宥芯
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Department of Communication and Technology
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傳播與科技學系
在現今社會中，身體健康一直備受注重，隨著時代的進步與發達，不少宣稱能使身體健康的新穎產品被發明，然而你知道其實想要擁有健康，你只要一天減少300大卡就好嗎？
電子菸比你想的更毒！可能帶來大麻煩
(2019-11-03)
林怡恩
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Department of Communication and Technology
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傳播與科技學系
美國自六月起發生多起「神秘肺病」，超過上千人得病，甚至多人死亡。這些患者在發病前皆吸食電子煙，讓電子菸對人體的危害成為近期討論焦點。
請撕掉「年齡」這個標籤
(2019-11-03)
曾弘碩
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Department of Communication and Technology
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傳播與科技學系
年齡歧視在社會上，是日益嚴重卻不能忽視的問題，這個議題同時也影響了社會職業層面的發展。
料理的實驗室分子料理
(2019-11-03)
曾冠霖
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Department of Communication and Technology
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傳播與科技學系
一場美食與科學的邂逅，感受分子料理帶來的感官饗宴。
將生活中的小不幸畫為大幸——「哭吧！小不幸人生」中的大幸
(2019-11-03)
李旻珊
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Department of Communication and Technology
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傳播與科技學系
「我覺得我的角色自己動起來了，根本就沒辦法掌控它。」大幸、她筆下的小不幸人生與背後的創作故事。
熱愛滑板從此和孩子們結緣－滑板店老闆橘哥
(2019-11-03)
黃心姵
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Department of Communication and Technology
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傳播與科技學系
在遇到跟他相同熱愛滑板的小朋友們後，橘哥開始為改善場地奔波，生活開始出現第二條路......
讓師塾飄香教育冒險者洪良老師：「制服不是孩子身上的標籤。」
(2019-11-03)
陳千柔
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Department of Communication and Technology
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傳播與科技學系
在教育界耕耘將近三十個年頭，撇除數學補教老師的身分，他還是一名創業家、學生、父親。
用色彩的疼痛治癒人心—刺青藝術家EDNA
(2019-11-03)
陳炘瑜
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Department of Communication and Technology
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傳播與科技學系
你看過夢幻又多采多姿的刺青嗎？你認為刺青代表的意義又是甚麼呢?水彩刺青藝術家—EDNA用她的心路歷程和對刺青的熱情，帶你認識與眾不同的刺青世界。
總編的話
(2019-11-03)
李金福
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Department of Communication and Technology
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傳播與科技學系
本期為喀報322期，共計10篇文章，包含一篇社會議題、三篇科技新知、兩篇藝文評論。本篇頭題為曾弘碩的〈請撕掉「年齡」這個標籤〉，文章分析目前社會現象仍然存在的「刻板印象」去深入探討。
High on/off ratio black phosphorus based memristor with ultra-thin phosphorus oxide layer
(2019-11-04)
Wang, Yudan
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Wu, Facai
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Liu, Xingqiang
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Lin, Jun
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Chen, Jui-Yuan
The scaling down of switching media encounters high leakage current in the traditional oxide material based memristors, resulting in high power consumption of chips. Two-dimensional (2D) materials promise an ultimate device scaling down to atomic layer thickness. Herein, black phosphorus (BP) and its self-assembly phosphorous oxide (BP) memristors are constructed, which leverages the high on/off ratio operation of oxides and low leakage current of 2D materials with high performance. The memristors exhibit reproducible and reliable switching characteristics with the on/off ratio >10(7) and data retention >10(4) s. Depending on the high reproducibility, basic "AND" and "OR" gates have been constructed on flexible substrates. Moreover, on the basis of the symmetry and linearity of conductance in the devices, the neural network simulation for supervised learning presents an online learning accuracy of 91.4%. This work opens an avenue for future flexible electronics.
Ash2l interacts with Oct4-stemness circuitry to promote super-enhancer-driven pluripotency network
(2019-11-04)
Tsai, Ping-Hsing
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Chien, Yueh
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Wang, Mong-Lien
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Hsu, Chih-Hung
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Laurent, Benoit
Pluripotency and cell fates can be modulated through the regulation of super-enhancers; however, the underlying mechanisms are unclear. Here, we showed a novel mechanism in which Ash2l directly binds to super-enhancers of several stemness genes to regulate pluripotency and self-renewal in pluripotent stem cells. Ash2l recruits Oct4/Sox2/Nanog (OSN) to form Ash2l/OSN complex at the super-enhancers of Jarid2, Nanog, Sox2 and Oct4, and further drives enhancer activation, upregulation of stemness genes, and maintains the pluripotent circuitry. Ash2l knockdown abrogates the OSN recruitment to all super-enhancers and further hinders the enhancer activation. In addition, CRISPRi/dCas9-mediated blocking of Ash2l-binding motifs at these super-enhancers also prevents OSN recruitment and enhancer activation, validating that Ash2l directly binds to super-enhancers and initiates the pluripotency network. Transfection of Ash2l with W118A mutation to disrupt Ash2l-Oct4 interaction fails to rescue Ash2l-driven enhancer activation and pluripotent gene upregulation in Ash2l-depleted pluripotent stem cells. Together, our data demonstrated Ash2l formed an enhancer-bound Ash2l/OSN complex that can drive enhancer activation, govern pluripotency network and stemness circuitry.
The Development of Controllable Magnetic Driven Microphysiological System
(2019-11-07)
Yang, Jia-Wei
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Chen, Yu-Wei
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Ho, Pei-Yi
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Jiang, Liane
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Hsieh, Kuan Yu
Current research has enabled the use of microphysiological systems and creation of models for alveolar and pulmonary diseases. However, bottlenecks remain in terms of medium- and long-term regulation of cell cultures and their functions in microchannel systems, as well as in the enhancement of in vitro representation of alveolar models and reference values of the data. Currently used systems also require on-chip manufacturing of complex units, such as pumps, tubes, and other cumbersome structures for maintaining cells in culture. In addition, system simplification and minimization of all external and human factors major challenges facing the establishment of in vitro alveolar models. In this study, a magnetically driven dynamic alveolus cell-culture system has been developed to use controlled magnetic force to drive a magnetic film on the chip, thereby directing the fluid within it to produce a circulating flow. The system has been confirmed to be conducive with regard to facilitating uniform attachment of human alveolar epithelial cells and long-term culture. The cell structure has been recapitulated, and differentiation functions have been maintained. Subsequently, reactions between silica nanoparticles and human alveolar epithelial cells have been used to validate the effects and advantages of the proposed dynamic chip-based system compared to a static environment. The innovative concept of use of a magnetic drive has been successfully employed in this study to create a simple and controllable yet dynamic alveolus cell-culture system to realize its functions and advantages with regard to in vitro tissue construction.
Curved block copolymer nanodiscs: structure transformations in cylindrical nanopores using the nonsolvent-assisted template wetting method
(2019-11-07)
Lin, Yu-Liang
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Cheng, Ming-Hsiang
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Chang, Chun-Wei
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Chu, Chien-Wei
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Liu, Chih-Ting
In this work, we study the structure transformations of cylinder-forming polystyrene-block-polydimethylsiloxane (PS31k-b-PDMS14.5k) confined in cylindrical nanopores. PS-b-PDMS nanotubes, nanospheres, and curved nanodiscs are ingeniously prepared by a facile template wetting strategy using anodic aluminum oxide (AAO) templates. Quantitative analyses of the structure transformations from nanospheres to curved nanodiscs are also conducted, showing that the lengths of the curved nanodiscs can be controlled by adjusting the annealing temperature and time. Furthermore, the PDMS domains of the nanostructures can be selectively etched using HF solutions, generating porous PS nanostructures. This work not only offers versatile routes to prepare block copolymer nanostructures with controlled shapes but also provides a deeper understanding of the structure transformation of block copolymers in confined geometries.
Secondary ion mass spectrometry to verify the implantation of magnetic ions in nanodiamonds
(2019-11-07)
Lin, Bo-Rong
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Wang, Chiung-Chi
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Chen, Chien-Hsu
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Kunuku, Srinivasu
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Hsiao, Tung-Yuan
Ion implantation is used to create nanodiamonds (NDs) with embedded magnetic ions for use in a wide range of biological and medical applications; however, the effectiveness of this process depends heavily on separating magnetic NDs from nonmagnetic ones. In this study, we use secondary ion mass spectrometry to verify the implantation of magnetic ions in NDs and the success of separation. When applied to a series of NDs with embedded iron or manganese ions, the sorting tool used in this study proved highly effective in selecting magnetic NDs. Besides, multienergy ion implantation and precise thickness control of NDs coating on the silicon wafer were suggested to improve this technology. Published under license by AIP Publishing.
Alkoxy Chain Number Effect on Self-Assembly of a Trigonal Molecule at the Liquid/Solid Interface
(2019-11-07)
Tahara, Kazukuni
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Nakayama, Ruri
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Maeda, Matsuhiro
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De Feyter, Steven
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Tobe, Yoshito
We herein investigated the effect of the number of alkoxy chains on the two-dimensional self-assembly of a trigonal molecular building block. To this end, a dehydrobenzo[12]-annulene (DBA) derivative, DBA-OC14-OC1 having three tetradecyloxy chains and three methoxy groups in an alternating manner, was synthesized. Scanning tunneling microscopy (STM) observations at the 1,2,4-trichlorobenzene (TCB)/graphite interface revealed that DBA-OC14-OC1 forms three monolayer structures: porous honeycomb, parallelogram, and hexagonal A structures. At the 1-phenyloctane (PO)/graphite interface, DBA-OC14-OC1 also forms three structures: parallelogram, hexagonal B, and dense linear structures. In contrast to the previously reported DBA derivative DBA-OC14 having six tetradecyloxy chains, DBA-OC14-OC1 shows structural polymorphism with a variety of alkyl chain interaction modes. Because in the observed patterns DBA-OC14-OC1 adopts a low symmetric C-s or C-1 geometry, the variation of the interaction modes and the resulting network patterns likely originate from the conformational flexibility on surface of this DBA by decreasing the number of alkyl chains. Molecular mechanics simulations gave insight into the structural and energy aspects of this pattern formation. We also discussed the role of solvents, TCB and PO, on the polymorph formation.
Enhancing the Seebeck effect in Ge/Si through the combination of interfacial design features
(2019-11-08)
Nadtochiy, Andriy
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Kuryliuk, Vasyl
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Strelchuk, Viktor
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Korotchenkov, Oleg
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Li, Pei-Wen
Due to their inherent physical properties, thin-film Si/SiGe heterostructures have specific thermal management applications in advanced integrated circuits and this in turn is essential not only to prevent a high local temperature and overheat inside the circuit, but also generate electricity through the Seebeck effect. Here, we were able to enhance the Seebeck effect in the germanium composite quantum dots (CQDs) embedded in silicon by increasing the number of thin silicon layers inside the dot (multi-fold CQD material). The Seebeck effect in the CQD structures and multi-layer boron atomic layer-doped SiGe epitaxial films was studied experimentally at temperatures in the range from 50 to 300 K and detailed calculations for the Seebeck coefficient employing different scattering mechanisms were made. Our results show that the Seebeck coefficient is enhanced up to approximate to 40% in a 3-fold CQD material with respect to 2-fold Ge/Si CQDs. This enhancement was precisely modeled by taking into account the scattering of phonons by inner boundaries and the carrier filtering by the CQD inclusions. Our model is also able to reproduce the observed temperature dependence of the Seebeck coefficient in the B atomic layer-doped SiGe fairly well. We expect that the phonon scattering techniques developed here could significantly improve the thermoelectric performance of Ge/Si materials through further optimization of the layer stacks inside the quantum dot and of the dopant concentrations.
搖你千遍也不厭倦！別再喝含糖飲料了
(2019-11-10)
石恩亞
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Department of Communication and Technology
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傳播與科技學系
台灣人愛喝手搖杯，飲料店密集為全球之冠，國內外多項研究報告顯示，如果每日喝超過2杯含糖飲品者容易早逝，原因大多為心血管疾病、糖尿病、癌症，警告飲料不離手的人們「喝越多，死越快」。