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Seonghyun Shin,Hyunsuk Hwang,Hojun Na,Changsoo Kim 한국멀티미디어학회 2007 한국멀티미디어학회 국제학술대회 Vol.2007 No.-
GIS has gradually been utilized for personal information as well as for specialized purposes such as traffic control, sight-seeing, tracking services, and disaster services. The GIS applications have been used not only by specialists but also general users through a Web-GIS approach. However, most Web-GIS applications are focused on displaying the stored information on maps, not on providing functions that users can register or modify their preference information on Points of Interests(Pols). Our research aims to present a personalized search technique considering preference attributes using ontologies on a Web-GIS Solution. To do this, we use Smart Client techniques that are amenable to piecing out and lowering of productivity cost. In addition, we design and implement a Life-GIS application which provides users with the personalized results of Pols retrieval on a Web-based GIS application using .Net Smart Client techniques and ontologies.
Design of the Ontology Based Retrieval Engine for Managing the Public Control Points
Seonghyun Shin,Yulan Cui,Myunggil Park,Hyunsuk Hwang,Yongcheol Suh,Changsoo Kim 한국멀티미디어학회 2008 한국멀티미디어학회 국제학술대회 Vol.2008 No.-
The spatial information is being more widely used with the development of ubiquitous society and the effective management of control points which are basis of the spatial information is required. The existing management system supports key words and categorized search. However, the ontology-based retrieval system is not only dealing with complex queries but also increasing effective business and convenience. Therefore, this paper proposes the design of the ontology-based retrieval engine including the function of intelligent and personalized search. Our searching engine is able to be applied to current management systems of control points and PDA and Web-based information systems related with control points.
Seonghyun Kim,Biju, K P,Minseok Jo,Seungjae Jung,Jubong Park,Joonmyoung Lee,Wootae Lee,Jungho Shin,Sangsu Park,Hyunsang Hwang IEEE 2011 IEEE electron device letters Vol.32 No.5
<P>We investigated the effect of scaling down the device area of WO<I>x</I> resistive random-access memory (RRAM) devices on their switching characteristics. Device dimensions were successfully scaled down to 50 nm using a via-hole structure with additional Al<SUB>2</SUB>O<SUB>3</SUB> sidewall process. As compared to the microscale devices, the nanoscale devices exhibited a distinct switching mechanism and better memory performance, such as improved switching uniformity, larger memory window, and stable endurance characteristics for up to 10<SUP>7</SUP> cycles. This improvement can be explained by a uniform interfacial switching mechanism in nanoscale device; this is in contrast with the defect-induced filamentary switching mechanism observed in microscale devices. In this way, the intrinsic switching properties of RRAMs were obtained by scaling down of the device area, indicating that RRAMs hold considerable promise for future applications.</P>
Effect of Program/Erase Speed on Switching Uniformity in Filament-Type RRAM
Jungho Shin,Jubong Park,Joonmyoung Lee,Sangsu Park,Seonghyun Kim,Wootae Lee,Insung Kim,Daeseok Lee,Hyunsang Hwang IEEE 2011 IEEE electron device letters Vol.32 No.7
<P>We investigated the effect of program/erase speed on switching uniformity in filament-type resistive memory with Mo/SiO<SUB>x</SUB>/Pt structure. The RRAM device exhibits a large on/off ratio (>; 10<SUP>5</SUP>), good data retention properties even at 200°C, and stable pulse-switching endurance up to 106 cycles. In comparison with slow switching operation, fast switching operation achieves more uniform program/erase performance in filament-type resistive memory. In order to determine the relationship between the switching speed and the uniformity, we carried out an effective analysis of real pulse operation.</P>
Low temperature polycrystalline silicon with single orientation on glass by blue laser annealing
Jin, Seonghyun,Hong, Seungpyo,Mativenga, Mallory,Kim, Boram,Shin, Heung Hyun,Park, Jong Kab,Kim, Tae-Woong,Jang, Jin Elsevier S.A. 2016 Thin Solid Films Vol.616 No.-
<P><B>Abstract</B></P> <P>We report the achievement of low-temperature polycrystalline silicon (LTPS) thin-films with a single orientation on glass by using continuous wave blue laser annealing (BLA) of amorphous silicon (a-Si). The BLA is administered in multiple shots and with increasing number of shots, grain size increases and all grains follow a single orientation. Because the absorption coefficient of a blue laser (BL) in poly-Si is less than that in a-Si, the amount of the un-melted Si at the bottom is gradually reduced with increasing number of shots, resulting in near complete melting of the whole Si layer. In this study, irradiation of a 150-nm-thick a-Si film with 200 BL (445nm) shots achieves a poly-Si film having an average grain size of about 4μm and single orientation in the (100) direction.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Large grain poly-Si thin films with a single orientation </LI> <LI> Crystallization of a-Si films by using multiple shots of the CW blue laser annealing </LI> <LI> Grain growth mechanism of Si films with increasing number of blue laser shots </LI> </UL> </P>
Kim, Seonghyun,Lee, Daeseok,Park, Jubong,Jung, Seungjae,Lee, Wootae,Shin, Jungho,Woo, Jiyong,Choi, Godeuni,Hwang, Hyunsang IOP Pub 2012 Nanotechnology Vol.23 No.32
<P>In this study, we propose a new and effective methodology for improving the resistive-switching performance of memory devices by high-pressure hydrogen annealing under ambient conditions. The reduction effect results in the uniform creation of oxygen vacancies that in turn enable forming-free operation and afford uniform switching characteristics. In addition, H<SUP>+</SUP> and mobile hydroxyl (OH<SUP>−</SUP>) ions are generated, and these induce fast switching operation due to the higher mobility compared to oxygen ions. Defect engineering, specifically, the introduction of hydrogen atom impurities, improves the device performance for metal–oxide-based resistive-switching random access memory devices. </P>
개인 식별 모델 학습을 위한 UWB 무선 신호 데이터 증강 기법
반성현(Seonghyun Ban),김승현(Seunghyun Kim),신승환(Seunghwan Shin),채근홍(Keunhong Chae),김유성(Yusung Kim) 한국정보과학회 2021 한국정보과학회 학술발표논문집 Vol.2021 No.6
무선 신호 기반 개인 식별은 이미지 기반 방식으로는 식별이 불가한 비가시 상황에도 적용될 수 있다는 장점이 있다. 많은 개방형 데이터셋이 존재하는 이미지와는 달리, 무선 신호 데이터는 대량의 데이터셋을 확보를 위해 큰 비용과 노력이 요구된다. 학습 데이터양이 부족한 경우 데이터 증강 기술을 통해 학습 성능을 높일 수 있지만, 무선 신호 데이터에 대한 증강 기법 연구가 미진하다. 본 논문은 UWB 무선 신호 데이터에 데이터 증강기법을 적용하여 개인 식별 모델 학습 성능에 미치는 영향을 분석하였다. 적용한 4가지 기법 모두 성능 향상에 도움을 주었고 그 중 Mixup 기법이 가장 높은 성능 향상을 보였다.