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- 저자 : 김태완(Taewan Kim) (검색결과 275 건)
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4H-SiC Schottky Barrier Diode Using Double-Field-Plate Technique
김태완,심슬기,조두형,김광수,Kim, Taewan,Sim, Seulgi,Cho, Dooyoung,Kim, Kwangsoo The Institute of Electronics and Information Engin 2016 전자공학회논문지 Vol.53 No.7
Silicon carbide (SiC) has received significant attention over the past decade because of its high-voltage, high-frequency and high-thermal reliability in devices compared to silicon. Especially, a SiC Schottky barrier diode (SBD) is most often used in low-voltage switching and low on-resistance power applications. However, electric field crowding at the contact edge of SBDs induces early breakdown and limits their performance. To overcome this problem, several edge termination techniques have been proposed. This paper proposes an improvement in the breakdown voltage using a double-field-plate structure in SiC SBDs, and we design, simulate, fabricate, and characterize the proposed structure. The measurement results of the proposed structure, demonstrate that the breakdown voltage can be improved by 38% while maintaining its forward characteristics without any change in the size of the anode contact junction region.
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김태완,추유림,김승래,Kim, Taewan,Chu, Yurim,Kim, Seung Rae 한국지진공학회 2017 한국지진공학회논문집 Vol.21 No.5
The building which are essential for disaster recovery is classified as a special seismic use group. Especially, achievement of seismic performance is very important for the hospital, so the hospital should be able to maintain its function during and right after an earthquake without significant damage on both structural and non-structural elements. Therefore, this study aimed at checking the seismic performance of a hospital building, but which was limited to structural elements. For the goal, a plan with a configuration of general hospitals in Korea was selected and designed by two different seismic-force-resisting systems. In analytical modeling, the shear behavior of the wall was represented by three inelastic properties as well as elastic. Nonlinear dynamic analyses were conducted to evaluate the performance of structural members. The result showed that the performance of shear walls in the hospital buildings was not satisfied regardless of the seismic-force-resisting systems, while the demands on the beams and columns did not exceed the capacities. This is the result of only considering the shear of the wall as the force-controlled action. When the shear of the wall was modeled as inelastic, the walls were yielded in shear, and as the result, the demands for frames were increased. However, the increase did not exceed the capacities of the frames members. Consequently, since the performance of walls is significant to determine the seismic performance of a hospital building, it will be essential to establish a definite method of modeling shear behavior of walls and judging their performance.
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기존 저층 필로티 건물의 스펙트럼 변위 기반 손상도 기준 개선
김태완,Kim, Taewan 한국지진공학회 2021 한국지진공학회논문집 Vol.25 No.5
The Ministry of the Interior and Safety in Korea developed seismic fragility function for various building types in 2009. Damage states for most building types were determined by structural analyses of sample models and foreign references because actual cases damaged by earthquakes rarely exist in Korea. Low-rise, piloti-type buildings showed severe damage by brittle failure in columns due to insufficient stirrup details in the 2017 Pohang earthquake. Therefore, it is necessary to improve damage state criteria for piloti-type buildings by consulting actual outcomes from the earthquake. An analytical approach was conducted by developing analysis models of sample buildings reflecting insufficient stirrup details of columns to accomplish the purpose. The result showed that current spectral displacements of damage states for piloti-type buildings might be too large to estimate actual fragility. When the brittle behavior observed in the earthquake is reflected in the analysis model, one-fourth through one-sixth of current spectral displacements of damage states may be appropriate for existing low-rise, piloti-type buildings.
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피로인산 전해질에서 양극산화를 통한 알루미늄 3104 합금 나노섬유 산화물 형성
김태완,이기영,Kim, Taewan,Lee, Kiyoung 한국전기화학회 2021 한국전기화학회지 Vol.24 No.1
In this study, we investigated the formation of the metal oxide nanostructure by anodization of aluminum 3104H18 alloy. The anodization was performed in pyrophosphoric acid (H4P2O7) electrolyte. By the control of anodization condition such as concentration of electrolyte, anodization temperature and applied voltage, nanoporous or nanofiber structures were obtained. The optimal anodization condition to form nanofiber structures are 75 wt% of H4P2O7 at 30 V and 20℃. When anodization was performed at over 40 V, nanoporous structures were formed due to accelerated dissolution reaction rate of nanofiber structures or increasing thickness of channel wall.
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Multi-level hierarchical attachment system Inspired by Gecko Feet
김태완(TaeWan Kim),이상돈(SangDon Lee) 한국트라이볼로지학회 2008 한국트라이볼로지학회 학술대회 Vol.2008 No.11
도마뱀 발붙이는 가장 진화한 응착 시스템으로 알려져 있다. 도마뱀 발은 setae, branches, spatulae로 이어지는 3층 구조로 구성되어 있으며 각 층은 수많은 섬모들로 이루어져 있다. 도마뱀의 응착 능력은 수많은 섬모들과 접촉 표면간의 반데르발스력이 1차 메커니즘이고 모세관력이 응착력을 증대시키는 2차 메커니즘으로 알려져 있지만 도마뱀 발붙이의 놀라운 응착 능력은 다층 구조의 응착 강화 효과로도 설명될 수 있다. 다층 구조의 성모들은 다양한 거친 표면에 대한 적합성을 높여 많은 수의 성모들이 표면과 직접 접촉함으로써 높은 응착력을 발휘할 수 있게 한다. 따라서 본 연구에서는 이러한 도마뱀 발 섬모의 다층 구조에 응착강화 효과를 시뮬레이션 하였다.
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Multi-level hierarchical attachment system Inspired by Gecko Feet
TaeWan Kim(김태완) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.6
도마뱀 발붙이는 수많은 다층의 섬모로 이루어져 있다. 그러한 섬모 구조는 높은 응착력을 발휘할 수 있는 첫번째 근원으로 알려져 있다. 다층 구조의 섬모들은 다양한 거친 표면에 대한 적합성을 높여 많은 수의 섬모들이 표변과 직접 접촉함으로써 높은 응착력을 발휘할 수 있게 한다. 본 연구에서는 생체모방 응착 시스템의 설계 가이드로 활용하기 위해 adhesion design map을 구축하고자 한다. 섬모의 재질, 작동하중 및 접촉하는 표변의 거칠기 정보가 주어졌을 때 각 제한조건을 만족하면서 원하는 응착성능을 발휘할 수 있는 최적의 섬모 형상을 설계할 수 있는 design map을 개발하였다.
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GPT 파인튜닝을 통한 대화형 AI의료 플랫폼 개발 : 질병 예측 및 대응 웹 서비스 구현
김태완(Taewan Kim),이정우(Jungwoo Lee),조주희(Joohee Cho),전영진(Youngjin Jeon),이재현(Jaehyun Lee),이동헌(Dongheon Lee),김은한(Eunhan Kim) 한국정보기술학회 2024 Proceedings of KIIT Conference Vol.2024 No.5
본 논문은 사용자가 챗봇을 통해 일상적인 의료 상담을 받을 수 있는 대화형 AI 의료 플랫폼을 소개한다. 사용자는 카카오 소셜 로그인을 통해 플랫폼에 접근하며, 커뮤니티 기능을 통해 다른 사용자들과 의료 정보를 공유할 수 있다. AI 상담 페이지에서는 사용자가 입력한 증상을 기반으로 맞춤형 상담을 제공하며, 이는 GPT-3.5 Turbo 모델과 의료 데이터셋을 파인 튜닝하여 개발된 챗봇을 통해 이루어진다. 이를 통해 의료 정보에 대한 접근성을 높이고, 건강 관리의 편의성을 향상시키는 것을 목표로 하며, 사용자에게 실시간으로 정확한 의료 상담을 제공한다. This paper introduces an interactive AI medical platform where users can receive everyday medical consultations through a chatbot. Users can access the platform via Kakao social login and share medical information with other users through community features. On the AI consultation page, personalized consultations based on user-input symptoms are provided through a chatbot developed by fine-tuning the GPT-3.5 Turbo model with medical datasets. The platform aims to improve access to medical information and enhance the ease of health management, offering users real-time and accurate medical consultations.
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