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Magnetic Properties of Hydrogen-Included TiZrNiPd Quasicrystals
Shin, Hongsik,Lee, Sang-Hwa,Jo, Youngsoo,Kim, Jae-Yong American Scientific Publishers 2012 Journal of Nanoscience and Nanotechnology Vol.12 No.7
<P>Quasicrystals prepared by rapid quenching of Pd-added TiZrNi ingots were hydrogenated, and effects of hydrogen for magnetic properties were compared with the unhydrogenated ones under magnetic fields from -10000 to 10000 Oe. The magnetization values obtained from vibrating sample magnetometer (VSM) were analyzed with the combination of powder X-ray diffraction (XRD) data. While its contribution is larger than that of Pd, hydrogen decreases the magnetic moments of both Pd-doped and undoped quasicrystals. As increasing the amount of absorbed hydrogen which is represented by H/M (hydrogen to host metal atom ratio) values from 0 to 1.19, the magnetization values of Ti53Zr27Ni20 quasicrystals measured at 10000 Oe significantly decreased from 0.301 to 0.212 emu/g. A careful analysis of XRD data demonstrated that the reduced interactions of magnetic dipole moments between Ni atoms, as the product of the expansion of the quasilattice constants after hydrogenation, are responsible for the decreased magnetization values in hydrogenated TiZrNiPd quasicrystal samples.</P>
Studies on formation of carborane film prepared by using a deuterium glow discharge method.
Shin, Hongsik,Kim, Euikwoun,Lee, Sang Yong,Lee, Sang-Hwa,Park, Sang-Joon,Chung, Kyu-Sun,Hong, Suk-Ho,Kim, Jaeyong American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.11
<P>Carborane powders (C2B10H12) were deposited on silicon substrates and the physical properties of the films were investigated as functions of the distance of the sample from the electrode, the carborane mass, and the plasma-pulse. To obtain the optimum thickness of the films, three silicon substrates were positioned at 6.5, 16.5, and 36.5 cm from the electrode, and the thickness of the samples was analyzed by using XRD, TEM, and SEM. For the deposition, the carborane powder was warmed to 80 degrees C in 10 minutes and was applied a DC-power pulse of 900 W (150 volts, 6 amps) for 2 hours. The mass of carborane and the on-time sequence were varied during the deposition. The combined results of XRD and TEM studies revealed that the structure of the deposited film is an amorphous phase. A careful analysis of the SEM images show that the thickness of the carborane films increased as increasing the mass of the flown carborane while it remained constant when a plasma-pulse time was varied. The thickest film of 353 A was achieved from the samples placed closest to the carborane inlet and the thickness became thinner as farther from the source suggesting that the density of the evaporated carborane powder in a chamber decreased as increasing the distance of the sample from the carborane inlet.</P>
신정훈(Shin Jeonghoon),윤홍식(Yun Hongsik),권정환(Kwon Jeonghwan),양소명(Yang Somyung) 한국방재학회 2018 한국방재학회논문집 Vol.18 No.2
In recent years, the Korean government has recognized the necessity of functional continuity of public institutions and has established 「Framework Act on the Management of Disaster and safety」 so that public institutions can build ‘Continuity of Operation Plan’. This study is based on theories and precedents, functional classification and determine recovery time objective for effective introduction of ‘Continuity of Operation Plan’ of local government. Based on business reference model (BRM), Look for a way that The functions of local governments are classified into daily function and emergency function from perspective of Continuity of Operation Plan. Based on the analysis and the logic of the case study, it was concluded that recovery time objective needs appropriate unity and that a flexible recovery time objective reflecting the characteristics of the function and the reality should be determined. 최근 국내에서 기능의 연속성에 대한 필요성 인식하여 공공기관에 대해 기능연속성계획을 구축하도록 「재난 및 안전관리기본법」에 신설하였다. 본 연구는 지방자치단체의 효과적인 기능연속성계획 도입을 위해 기능 분류와 복구목표기간에 대한 이론과 선행사례를 바탕으로 정책적인 고찰을 수행하였다. 기능 분류는 지방자치단체의 기능분류체계(BRM)에서 기능연속성 관점으로 일상기능과 비상기능으로 재분류하는 방안을 모색하였다. 복구목표기간에 대해서는 해외 사례조사를 통한 분석과 논리에 근거하여 적절한 통일성이 요구되며, 기능의 특성과 현실 가능성을 반영한 유동적인 복구목표기간이 결정되어야 한다는 결론을 도출하였다.
Q-DRAM: Quick-Access DRAM with Decoupled Restoring from Row-Activation
Wongyu Shin,Jungwhan Choi,Jaemin Jang,Jinwoong Suh,Yongkee Kwon,Youngsuk Moon,Hongsik Kim,Lee-Sup Kim IEEE 2016 IEEE Transactions on Computers Vol. No.
<P>The relatively high latency of DRAM is mostly caused by the long row-activation time which in fact consists of sensing and restoring time. Memory controllers cannot distinguish between them since they are performed consecutively by a single row-activation command. If these two steps are separated, the restoring can be delayed until DRAM access is uncongested. Hence, we propose Quick-Access DRAM (Q-DRAM) which discriminates between sensing and restoring. Our approach is to allow destructive access (i.e., only sensing is performed without restoring by a row-activation command) using per-bank multiple row-buffers. We call the destructive access and per-bank multiple row-buffers quick-access and quick-buffers (q-buffers) respectively. In addition, we propose Quick-access Trigger (Q-TRIGGER) and RESTORER to utilize Q-DRAM. Q-TRIGGER makes a decision whether quick-access is required or not, and RESTORER decides when to restore the data at the destructed cell. Specifically, RESTORER detects the proper timing to hide restoring time by predicting data bus occupation and by exploiting bank-level locality. Evaluations show that Q-DRAM significantly improved performance for both single-and multi-core systems.</P>
Web 2.0기반 인터넷 방송(CCS) 컨텐츠와 UCC 컨텐츠의 기능적 차이에 따른 장르별 사용동기 비교
신영훈(Younghoon Shin),김민정(MinJeong Kim),김태한(Teahan Kim),김홍식(Hongsik Kim),김효선(Hyosun Kim) 한국HCI학회 2013 한국HCI학회 학술대회 Vol.2013 No.1
인터넷 산업의 급속한 발달로 인하여 최근에는 Web 2.0 환경으로 정보의 소유자나 독점자가 없이 누구나 손쉽게 데이터를 생산, 공유할 수 있게 되었다. 이러한 환경으로 인하여 UCC(User Created Contents)라는 하나의 문화가 발전하게 되었고, 이에서 더욱 발전하여 생방송 CCS(Crowd-Casting Services)라는 쌍방향 상호작용이 가능한 인터넷 방송 서비스까지 출현하게 되었다. 본 연구에서는 국내의 독보적인 인터넷 방송 서비스 업체인 Afreeca TV와 세계적인 UCC 사이트인 YouTube와의 비교 분석을 통하여 생방송 CCS가 어떠한 요소로 인해 인기를 끌게 되었는지를 장르별 사용동기와 기능적인 측면에서 살펴보았다. 이용자들을 대상으로 한 이용동기와 이용량, 선호기능등의 설문조사로 필요한 데이터를 수집하였다. 그 결과 Afreeca TV와 YouTube의 관계에 있어 특정 장르나 이용 목적, 기능에 따른 강세는 각각 있었지만, 어느 한쪽이 다른 쪽을 대체할 것으로 예상할 만한 수치는 나타나지 않았다. 따라서 UCC 포털사이트와 인터넷 방송국의 관계는 앞으로도 상호 보완적 관계로 나아갈 것으로 보인다. 추후 컨텐츠 관련 연구가 추가적으로 이루어진다면 인터넷 방송 공급자와 이용자 쌍방의 만족도를 높일 수 있는 컨텐츠와 이용자의 사용성/유용성에 좀 더 비중을 둔 양방향 방송 플랫폼 발전에 기여할 수 있을 것이다. The rapid growth in the internet industry and Web 2.0 has made it possible for users to create and share information freely. Based on this, User Created Contents(UCC) has become a subculture, eventually extended to Crowd-Casting Services(CCS), an internet broadcasting service with an interactive basement. In this study, we intend to compare Afreeca TV, a unique domestic internet broadcasting service company, with YouTube, the worldwide UCC website in the aspect of its usage and function. A survey on Google Docs is used to collect data on users" use motivations, usage and preferred funcions. As a result, we find some tendencies in genre, purpose and function each by each, but there has been no specific datum to anticipate a substitution. Therefore, in point of relationship, UCC portal sites and internet broadcasting services will be complementary, as is today. And it is expected that further studies on contents will provide substantial contribution on the development of broadcasting contents and interactive broadcasting platform, in a way to give more broadcaster-user satisfaction and to place more weight on usability and usefulness of users.