다중금속복합층 핵연료 피복관의 필거링 공정에 관한 유한 요소 해석 연구

김태용,이정현,김지현,Kim, Taeyong,Lee, Jeonghyeon,Kim, Ji Hyun 한국압력기기공학회 2017 한국압력기기공학회 논문집 Vol.13 No.2

In severe accident conditions of light water reactors, the loss of coolant may cause problems in integrity of zirconium fuel cladding. Under the condition of the loss of coolant, the zirconium fuel cladding can be exposed to high temperature steam and reacted with them by producing of hydrogen, which is caused by the failure in oxidation resistance of zirconium cladding materials during the loss of coolant accident scenarios. In order to avoid these problems, we develop a multi-metallic layered composite (MMLC) fuel cladding which compromises between the neutronic advantages of zirconium-based alloys and the accident-tolerance of non-zirconium-based metallic materials. Cold pilgering process is a common tube manufacturing process, which is complex material forming operation in highly non-steady state, where the materials undergo a long series of deformation resulting in both diameter and thickness reduction. During the cold pilgering process, MMLC claddings need to reduce the outside diameter and wall thickness. However, multi-layers of the tube are expected to occur different deformation processes because each layer has different mechanical properties. To improve the utilization of the pilgering process, 3-dimensional computational analyses have been made using a finite element modeling technique. We also analyze the dimensional change, strain and stress distribution at MMLC tube by considering the behavior of rolls such as stroke rate and feed rate.

산화물 반도체의 다양한 처리를 통한 박막트랜지스터의 전기적 특성 향상

김태용,장경수,이소진,강승민,이윤정,이준신,Kim, Taeyong,Jang, Kyungsoo,Raja, Jayapal,Phu, Nguyen Thi Cam,Lee, Sojin,Kang, Seungmin,Trinh, Than Thuy,Lee, Youn-Jung,Yi, Junsin 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.1

The ultimate aims of display market is transparent or flexible. Researches have been carried out for various applications. It has been possible to reduced the process steps and get good electrical properties for semiconductors with large optical bandgaps. Oxide semiconductors have been established as one of the leading and promising technology for next generation display panels. In this paper, alternative treatment processes have been tried for oxide semiconductors of thin film transistors to increase the electrical properties of the thin film transistors and to investigate the mechanisms. There exist a various oxide semiconductors. Here, we focused on InGaZnO, ZnO and InSnZnO which are commercialized or researched actively.

납-비스무스 공융물 환경에서의 적층제조된 재료의 부식 거동 연구

김태용(Taeyong Kim),김병주(Byeongju Kim),김기동(Gidong Kim),송상우(Sangwoo Song),김지현(Ji Hyun Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11

This paper study on LBE corrosion behavior of clad material manufactured by direct energy deposition . Fe-12Cr-2Si alloys, which is corrosion resistance material with clad, are immersed in 550 ℃, 1e-7 wt.% dissolved oxygen concentration static LBE. At the same time, SS316L clad are also exposed to same condition. Through a scanning electron microscope, corroded cross-section of clad Fe-12Cr-2Si, clad SS316L and as-received SS316L are compared. The clad Fe-12Cr-2Si shows more enhanced corrosion resistance than as-received Fe-12Cr-2Si because grain size of the clad is bigger so that diffusion paths like grain boundaries decrease. On the other hand, corrosion resistance of the clad SS316L is inferior to as-received SS316L. When passive layer is not sufficient, solub le Ni in LBE is easy to diffuse not only grain boundary but also grain. Larger grain which has high diffusivity along crystal plane locally, deeper the dissolution and LBE penetration depth.

납-비스무스 공융물 환경에서의 적층제조된 재료의 부식 거동 연구

김태용(Taeyong Kim),김병주(Byeongju Kim),김기동(Gidong Kim),송상우(Sangwoo Song),김지현(Ji Hyun Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11

This paper study on LBE corrosion behavior of clad material manufactured by direct energy deposition . Fe-12Cr-2Si alloys, which is corrosion resistance material with clad, are immersed in 550 ℃, 1e-7 wt.% dissolved oxygen concentration static LBE. At the same time, SS316L clad are also exposed to same condition. Through a scanning electron microscope, corroded cross-section of clad Fe-12Cr-2Si, clad SS316L and as-received SS316L are compared. The clad Fe-12Cr-2Si shows more enhanced corrosion resistance than as-received Fe-12Cr-2Si because grain size of the clad is bigger so that diffusion paths like grain boundaries decrease. On the other hand, corrosion resistance of the clad SS316L is inferior to as-received SS316L. When passive layer is not sufficient, solub le Ni in LBE is easy to diffuse not only grain boundary but also grain. Larger grain which has high diffusivity along crystal plane locally, deeper the dissolution and LBE penetration depth.

충돌모의(Sled) 시험에 의한 특별교통수단 휠체어 탑승자 상해에 관한 연구

김태용(Taeyong Kim),심소정(Sojung Shim),김시우(Siwoo Kim) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5

옥외용 절연체 내부 시멘트의 수소 이온 농도 분석

김태용(Taeyong Kim),이윤정(Youn-Jung Lee),구자빈(Ja-Bin Koo),손주암(Ju-Am Son),최인혁(In-Hyuk Choi),이준신(Junsin Yi) 대한전기학회 2019 대한전기학회 학술대회 논문집 Vol.2019 No.10

『묵자』의 기술관 연구

김태용 ( Kim Taeyong ) 한국중국학회 2018 중국학보 Vol.86 No.-

제4차 산업혁명시대를 맞이해서, 인류는 기술의 발전에 자신을 맞추는 것이 아니라, 자신의 목적에 맞게 기술개발 방향을 설정해야 한다. 모든 기술개발은 좋은 사회를 만드는 방향으로 진행되어야 한다. 동서고금을 막론하고 자신들이 지향하는 좋은 사회와 좋은 기술이란 ‘보편적 사랑’과 ‘공동의 이익’이 실현된 사회 그리고 이러한 사회를 실현시킬 수 있는 기술이라고 말할 것이다. 그런데 우리는 고대 중국의 철학자이고 기술자인 묵자가 말한 ‘겸상애’와 ‘교상리’를 현대어로 ‘보편적 사랑’과 ‘공동의 이익’으로 번역할 수 있다. 그러므로 논자는 묵자의 기술 철학을 조명하고 이를 기초로 우리 시대의 기술개발 방향을 조망해 보는 것도 매우 의미 있는 작업이라고 생각한다. 묵자는 기술개발이 인민의 이익에 부합하는 방향으로 나아가야 한다고 주장한다. 그가 말한 인민의 이익이란 오감의 즐거움과 사지의 편안함이 아니라, 필요한 의식주 문제의 해결이다. 묵가 철학의 핵심은 ‘겸상애, 교상리’이다. ‘교상리’의 관점에서 볼 때, 묵자의 기술철학에서 기술자가 인민의 생활을 이롭게 하는 실용적 도구를 인민에게 공급하는 것이 중요하지만, 기술개발을 통해 얻은 자신의 이익을 사회경제적 약자에게 나누어 주는 것도 중요하다. ‘겸상애’의 관점에서 볼 때, 묵자의 기술철학에서 기술자의 기술 개발은 자기 지역과 자기 세대뿐만 아니라, 모든 지역과 모든 세대의 이해득실을 고려해서 진행되어야 한다. 묵자는 ‘겸상애’와 ‘교상리’가 가치 충돌을 일으킬 때, ‘겸상애’를 우선시한다. 그는 ‘겸상애’에 기초한 ‘교상리’만이 공동체의 이익을 창출할 수 있다고 주장한다. 특히, 묵자는 계층간 사회경제적 차이에 주목하고, 사회경제적 약자에 대한 배려를 매우 강조한다. 이로 볼 때, 묵자가 말한 ‘인민의 이익’은 ‘사회경제적 약자의 이익’이다. 그리고 묵자가 지향하는 기술개발의 좋은 방향은 사회경제적 약자의 이익을 최우선으로 고려하는 것이다. 우리는 제4차 산업혁명시대에 살아가고 있지만, 세계는 여전히 빈곤과 기아를 걱정하고 또한 새로운 기술개발로 사회적 양극화는 더욱 심화되고 많은 사람들이 실업의 위기에 직면하고 있다. 제4차 산업혁명이 지금 보다 더 좋은 사회를 지향하는 것이라면, 우리는 묵자의 기술 철학을 참고할 필요가 있다. While in the era of the Fourth Industrial Revolution, human beings need to establish the direction of technological development for their own purpose, rather than fitting themselves into the technology development. All of the technological development needs to progress towards making good society. Regardless of all times and places, people pursue a good technology and a good society. A good society is defined as a society fulfilled with universal love and public good. A good technology is defined as the technology promoting the society having universal love and public good. The saying, “inclusively caring for each other and mutually benefiting each other” mentioned by Mozi, a Chinese philosopher and engineer, can be interpreted as universal love and public good. Therefore, it is meaningful to prospect the direction of technology development of our time on the basis of Mozi’s philosophical perspective of technology. Mozi conveys the need for the progression of technology development to be for the benefit of the people. In accordance with Mozi’s philosophical view, the real benefit of people is the resolving problems that associate with their daily life, not their emotional pleasure and physical comfort. The core idea of Mozi’s philosophy is “inclusively caring for each other and mutually benefiting each other”. In Mozi’s philosophical view of “mutually benefiting each other”, it is substantial for engineers to provide people with practical tools that benefit people’s lives; moreover, it is important that the personal benefit earned by technological development should be shared with the disadvantaged. In Mozi’s philosophical view of “inclusively caring for each other”, the technological development of engineers should continue to accelerate in growth in consideration of not only the benefit of own region and present generation, but for also other regions and for the advantage towards future generations. Mozi puts “inclusively caring for each other” above “mutually benefiting each other” when there is a conflict between “inclusively caring for each other” and “mutually benefiting each other”. He says that only “mutually benefiting each other” based on “inclusively caring for each other” can create public good. Particularly, Mozi takes interested in the social polarization among social classes and emphasizes the benefit of the disadvantaged. Namely, the benefit of the people that Mozi said is the benefit of the disadvantaged. The good direction of technology development of Mozi is considering the benefit of the disadvantaged to become the top priority. Although people live in the era of the Fourth Industrial Revolution, the world is still suffering from poverty and starvation, the gap between the rich and the poor deepens caused by the new technology development, and in addition, many people face with the crisis of mass unemployment. If the Fourth Industrial Revolution aims to make a better society, it is necessary to use Mozi’s philosophy of technology for reference.

UNECE 자동차 국제기준 월간 동향 (58)

김태용(Taeyong Kim) 한국자동차공학회 2023 오토저널 Vol.45 No.12

토픽 모델링 및 다양한 통계기법을 활용한 국내 지질학의 연구동향 분석

김태용(Taeyong Kim),양민준(Minjune Yang) 대한지질학회 2022 대한지질학회 학술대회 Vol.2022 No.10

ESD에 따른 산화형 VCSEL 열화 과정의 등가회로 모델을 이용한 분석

김태용(Taeyong Kim),김상배(Sang-Bae Kim) 대한전자공학회 2008 電子工學會論文誌-SD (Semiconductor and devices) Vol.45 No.3

Electrostatic Discharge (ESD) 펄스의 누적이 산화형 표면 발광 반도체 레이저 (oxide VCSEL)의 전기 및 광학적 특성의 열화에 미치는 영향에 대하여 살펴보았다. 순방향 ESD의 누적에 따른 열화 과정은 3 단계의 열화과정을 보이는 반면 역방향 ESD의 인가에 따른 열화 과정은 급격한 전기 및 광학적 특성 변화에 의하여 구분되는 2 단계의 열화과정을 보였다. 등가회로 모델 및 대신호 등가회로 모델을 이용하여 I -V 특성 및 그 미분특성을 분석함으로써 두 가지 ESD 조건에 의한 산화형 VCSEL의 전기 및 광학적 특성의 열화과정을 이해할 수 있었다. We have investigated the effect of the forward and reverse ESD pulse accumulation on the development of the oxide VCSEL’s electrical and optical characteristics. The forward ESD-induced degradation is complicated, showing three degradation phases with increasing ESD voltage while the reverse ESD-induced degradation is divided by a sudden distinctive change in electro-optical characteristics. By comparing the measured L ?I ?V characteristics and their derivatives with the fitted characteristics using an equivalent circuit model as well as the large signal circuit model, the development of the oxide VCSEL's electro-optical characteristics under forward and reverse ESD conditions has been fully understood.