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RISS 인기검색어
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- 저자 : Tae Jin Yun(윤태진) (검색결과 95 건)
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A5J32/A5052 이종 알루미늄 합금 겹치기 마찰교반접합부의 인장성질에 미치는 재료배열 및 접합조건의 영향
윤태진,강명창,강정윤,Yoon, Tae-Jin,Kang, Myung-Chang,Kang, Chung-Yun 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.4
A5J32-T4 and A5052-H32 dissimilar aluminum alloy plates with thickness of 1.6 and 1.5 mm were welded by friction stir lap welding (FSLW). The FSLW were studied using different probe length tool and various welding conditions which is rotation speed of 1000, 1500 rpm and welding speed of 100 to 600 mm/min and material arrangement, respectively. The effects of plunge depth of tool and welding conditions on tensile properties and weld nugget formation. The results showed that three type nugget shapes such as hooking, void, sound have been observed with revolutionary pitch. This plunge depth and material arrangement were found to effect on the void and hooking formation, which in turn significantly influenced the mechanical properties. The maximum joint efficiency of the FSLWed plates was about 90% compared to base metal, A5052-H32 when the A5052-H32 was positioned upper plate and plunge depth was positioned at near interface between upper and lower plates.
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KS5J32 Al합금 마찰교반접합부의 인장성질에 미치는 접합조건의 영향
윤태진,김상주,김남규,송상우,강정윤,Yoon, Tae-Jin,Kim, Sang-Ju,Kim, Nam-Kyu,Song, Sang-Woo,Kang, Chung-Yun 대한용접접합학회 2011 대한용접·접합학회지 Vol.29 No.5
The effect of welding condition on tensile properties of KS5J32 Al Alloy was investigated under various welding conditions. The 1.6 mm thick KS5J32 alloy sheets were joined by friction stir welding (FSW) technique with butt joint. The tool rotation speeds were 1000, 1250 and 1500 rpm, and the welding speeds were varied within the range from 100 to 600 mm/min. Voids mainly occurred at the advancing side of the tool probe, when the tool rotation speed was low, due to insufficient materials flow. When the weld pitch exceeded 0.4 mm/rev, voids were observed under all welding conditions and the area of voids increased with increasing weld pitch. For void-free specimens, fracture always occurred at base materials. However voids affected the location of fractures, base metal or welded zone, when the voids existed within the welds.
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심장외 도관을 사용하지 않는 동맥간의 완전교정;6례 보고
윤태진,김용진,Yun, Tae-Jin,Kim, Yong-Jin 대한흉부심장혈관외과학회 1992 Journal of Chest Surgery (J Chest Surg) Vol.25 No.12
Between July, 1990 and July, 1992, 6 male patients of truncus arteriosus, whose age ranged from 2 months to 18 months, underwent total surgical correction without a extracardiac conduit. Their anatomic types were type I in 3, type II in 2 and III, in one by the Collett-Edwards classification. Surgical techniques were similar to the first description by Lecompte except for the fact that distal pulmonary arterial stumps were approximated to ventriculotomy site without Lecompte maneuver in all cases. Also in all cases, mon-ocusps were placed using glutaraldehyde fixed autologous pericardial patch directly in right ventricular outflow tract. Three patients died postoperatively and the causes of death were myocardial failure, pulmonary hypertensive crisis and pulmonary complication due to progressive pulmonary vascualr obstructive disease respectively. The three survivors have been followed up for 6~10 months with good functional results.
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W92-Ni-Fe 소결툴을 이용한 Cu-Ni 합금의 용접부미세조직과 경도 특성
윤태진,박상원,강명창,노중석,정성욱,강정윤,Yoon, Tae-Jin,Park, Sang-Won,Kang, Myung-Chang,Noh, Joong-Suk,Chung, Sung-Wook,Kang, Chung-Yun 한국분말야금학회 2015 한국분말재료학회지 (KPMI) Vol.22 No.3
In this study, the effect of the friction stir welding (FSW) was compared with that of the gas tungsten arc welding (GTAW) on the microstructure and microhardness of Cu-Ni alloy weldment. The weldment of 10 mm thickness was fabricated by FSW and GTAW, respectively. Both weldments were compared with each other by optical microstructure, microhardness test and grain size measurement. Results of this study suggest that the microhardness decreased from the base metal (BM) to the heat affected zone (HAZ) and increased at fusion zone (FZ) of GTAW and stir zone (SZ) of FSW. the minimum Hv value of both weldment was obtained at HAZ, respectively, which represents the softening zone, whereas Hv value of FSW weldment was little higher than that of GTAW weldment. These phenomena can be explained by the grain size difference between HAZs of each weldment. Grain size was increased at the HAZ during FSW and GTAW. Because FSW is a solid-state joining process obtaining the lower heat-input generated by rotating shoulder than heat generated in the arc of GTAW.
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이종 알루미늄 합금 A6K31/A5J32 겹치기 마찰교반 접합부의 인장성질에 미치는 접합조건의 영향
윤태진,김상주,송상우,홍재근,강정윤,Yoon, Tae-Jin,Kim, Sang-Ju,Song, Sang-Woo,Hong, Jae-Keun,Kang, Chung-Yun 대한용접접합학회 2011 대한용접·접합학회지 Vol.29 No.2
The scope of this investigation is to evaluate the effect of joining parameters on the microstructural features and mechanical properties of dissimilar aluminum alloys, 1mm-thickness fixing AA6K31 at the top position and fixing AA5J32 at the bottom position. The friction stir lap welds were studied under various welding conditions, rotation speed of 1000, 1250, 1500rpm and welding speed of 100, 300, 500, 700mm/min, respectively. Mechanical test has been investigated in terms of tensile shear test and hardness test. The results showed that three type nugget shapes such as onion ring, zigzag type, hooking with the void, have been observed with revolutionary pitch. All welding conditions fractured at the HAZ of top plate, A6K31 and also the strength compare with base metal of lap joints were low efficiency, 52~63%. The thickness of fractured position was decreased with the lower heat input conditions. The relationships were excellent due to linear between the effective thickness of fractured position and peak load. The fractured position was the interface between joint area and not joint area. Also the strength efficiency compared with base metal was lower than decreasing rate of thickness because the hardness was decreased at fractured position due to softened material.
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OTP와 일회성 난수를 사용한 AES 알고리즘 기반의 개선된 RFID 상호 인증 프로토콜
윤태진(Tae-Jin Yun),오세진(Se-Jin Oh),안광선(Kwang-Seon Ahn) 한국컴퓨터정보학회 2011 韓國컴퓨터情報學會論文誌 Vol.16 No.11
RFID 시스템은 무선 주파수를 이용하기 때문에 도청, 위치 추적, 스푸핑 공격, 재전송 공격과 같은 공격에 취약하다. 이를 해결하고자 RFID 시스템의 상호 인증 기법과 암호화 기법이 활발히 연구되고 있다. 그러나, 과거 AES(Advanced Encryption Standard)를 이용한 대칭키 기반의 프로토콜은 고정키 문제와 보안 취약성을 안고 있어 본 논문에서 기존 프로토콜의 보안 취약성을 증명하고, OTP(One-Time Pad) 기법과 AES를 이용한 프로토콜을 제안하여 보안 취약점을 보완하고 연산, 하드웨어 오버헤드를 감소하고자 한다. 제안 프로토콜은 리더와 태그간 데이터를 암호화하고, 리더의 일회성 난수 사용하여 상호 인증을 한다. 그리고, S.Oh 프로토콜을 비롯한 기존 프로토콜과 비교 분석으로 보안성과 서버, 리더, 태그의 연산량 측면 등 효율성에서 상대적으로 우수함을 보인다. Because RFID systems use radio frequency, they have many security problems such as eavesdropping, location tracking, spoofing attack and replay attack. So, many mutual authentication protocols and cryptography methods for RFID systems have been proposed in order to solve security problems, but previous proposed protocols using AES(Advanced Encryption Standard) have fixed key problem and security problems. In this paper, we analyze security of proposed protocols and propose our protocol using OTP(One-Time Pad) and AES to solve security problems and to reduce hardware overhead and operation. Our protocol encrypts data transferred between RFID reader and tag, and accomplishes mutual authentication by one time random number to generate in RFID reader. In addition, this paper presents that our protocol has higher security and efficiency in computation volume and process than researched protocols and S.Oh's Protocol. Therefore, our protocol is secure against various attacks and suitable for lightweight RFID tag system.
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