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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.
이종 네트워크 간 에너지 효율적인 핸드오버를 지원하는 모바일 P2P 메시지 플랫폼
김태용(Taeyong Kim),강경란(Kyungran Kang),조영종(Young-jong Cho) 한국정보과학회 2009 정보과학회 컴퓨팅의 실제 논문지 Vol.15 No.10
본 논문에서는, GPS와 무선랜, 블루투스 등이 탑재된 이동 단말의 비율이 높아지게 됨에 따라, 이동 단말이 갖는 다중 무선 네트워크 기술을 활용하는 모바일 P2P 메시지 플랫폼을 제시한다. 자신과 타 단말의 GPS 정보에 근거하여 메시지 전달 방법을 ‘직접’, ‘간접’, ‘원거리’로 전달 방식을 구분한다. 근거리 무선 네트워크 접속 기술(radio access technology, RAT)를 사용하는 ‘직접’ 방식보다 수신 단말과의 도달 거리를 늘이기 위해 릴레이 노드를 선정하여 ‘간접’으로 수신 단말에게 메시지를 전달한다. ‘직접’이나 ‘간접’ 등의 근거리 RAT를 활용하여 메시지 전달이 불가능한 경우에는 무선 WAN(wide area network) 기술을 사용하는 ‘원거리’ 방식으로 메시지를 전달한다. 적용할 RAT 기술을 선택하는데 있어 GPS 정보를 기반으로 함으로써 네트워크 간 핸드오버를 결정하는데 전력 소모가 적다. 네트워크 시뮬레이터를 이용하여, 메시지 전달 성능과 단말의 이동 속도와 RAT의 도달 거리에 따른 핸드오버 감지 오차에 대한 평가를 시행하였고, 제안하는 기법의 우수한 성능을 확인하였다. 제안하는 메시지 전달 기법을 포함하는 메시지 플랫폼을 스마트 폰에 실제 구현하였다. 실제 에너지 소모량 관찰과 수식적 모델링을 통해, 제안한 플랫폼을 탑재한 경우와 탑재하지 않은 경우에 대해 전력 소모를 비교하였으며, 본 플랫폼을 탑재한 경우가 그렇지 않은 경우들에 비해 전력 소모가 크게 낮음을 확인하였다. This paper suggests the energy-efficient message delivery scheme and the software platform which exploits the multiple network interfaces of the mobile terminals and GPS in the current mobile devices. The mobile terminals determine the delivery method among ‘direct’, ‘indirect’, and ‘WAN’ based on the position information of itself and other terminals. ‘Direct’ method sends a message directly to the target terminal using local RAT. ‘Indirect’ method extends the service area by exploiting intermediate terminals as relay node. If the target terminal is too far to reach through ‘direct’ or ‘indirect’ method, the message is sent using wireless WAN technology. Our proposed scheme exploits the position information and, thus, power consumption is drastically reduced in determining handover time and direction. Network simulation results show that our proposed delivery scheme improves the message transfer efficiency and the handover detection latency. We implemented a message platform in a smart phone realizing the proposed delivery scheme. We compared our platform with other typical message platforms from energy efficiency aspect by observing the real power consumption and applying the mathematical modeling. The comparison results show that our platform requires significantly less power.