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A Study on the Weldability of Cylindrical Secondary Battery Material using Green Laser
Hyun Jong Yoo,Jun Su Park,Ik Geun Jeon,Myung Jin Kim,Jong Sik Kim,Hee Shin Kang 대한용접·접합학회 2024 대한용접·접합학회지 Vol.42 No.1
This study investigates a green laser welding on a nickel-coated copper-mild steel material used in an electric vehicle battery. The laser power and scan speed were varied, and through optical microscopy, it was demonstrated that excessive heat input led to increased weld penetration depth and bead width. Regarding defects, excessive heat input caused the formation of oxide, spatter on the bead surface, as well as porosity and cracks inside the weld penetration depth. The mechanical properties were evaluated through shear stress and microhardness measurements, indicating that as the heat input increased, the mechanical properties improved for the sample welded under the 2 ㎾ condition. Considering the fire risk (occur at weld penetration depth over 50%) and joining aspects (start at weld penetration depth higher 20%), the optimal conditions were set as 1.6 ㎾ and 300 ㎜/s. This optimized condition was set as the reference for monitoring. Based on the optimized condition, the results shown that an increase in heat input led to increased plasma and temperature signals, and an increase in scanning speed resulted in an increase in reflected light signal.
USN을 이용한 온실가스 및 에너지 실시간 모니터링 기술 개발 및 적용
유종익(Yoo Jong Ik),이동훈(Lee Dong Hun),이훈, 권동명(Kwon, Dong Myung) 한국IT서비스학회 2010 한국IT서비스학회 학술대회 논문집 Vol.2010 No.9
온실가스 및 에너지 관리에 있어서 측정, 보고 및 검증 가능한 방식의 관리수준이 요구되고 있다. 특히 온실가스 배출량을 산정하기 위해서는 온실가스 배출량의 가장 중요하고 많은 부분을 차지하고 있는 에너지의 사용량을 계측하는 것이 매우 중요하다. 이를 위해 USN 기반의 ICT기술을 활용하여 온실가스 관리가 가능하도록 기존의 에너지 계측 장치, 데이터 전송 및 수집 장치를 하나의 시스템으로 구성하고 웹을 통해 정보를 제공할 수 있도록 하였다. 특히, 온실가스 모니터링 시스템에서는 온실가스 배출 현황을 실시간 확인 할 수 있도록 함으로써 온실가스 배출 실적, 감축 수단 발굴을 위한 온실가스 맵, 온실가스 감축 수단에 따른 감축 실적을 파악하는데 활용할 수 있을 것으로 사료된다.
Yoo, Jaehyun,Moon, Ik-Sang,Yun, Jeong-Ho,Chung, Chooryung,Huh, Jong-Ki,Lee, Dong-Won Korean Academy of Periodontology 2019 Journal of Periodontal & Implant Science Vol.49 No.3
Purpose: Implant wall thickness and the height of the implant-abutment interface are known as factors that affect the distribution of stress on the marginal bone around the implant. The goal of this study was to evaluate the long-term effects of supracrestal implant placement and implant wall thickness on maintenance of the marginal bone level. Methods: In this retrospective study, 101 patients with a single implant were divided into the following 4 groups according to the thickness of the implant wall and the initial implant placement level immediately after surgery: 0.75 mm wall thickness, epicrestal position; 0.95 mm wall thickness, epicrestal position; 0.75 mm wall thickness, supracrestal position; 0.95 mm wall thickness, supracrestal position. The marginal bone level change was assessed 1 day after implant placement, immediately after functional loading, and 1 to 5 years after prosthesis delivery. To compare the marginal bone level change, repeated-measures analysis of variance was used to evaluate the statistical significance of differences within groups and between groups over time. Pearson correlation coefficients were also calculated to analyze the correlation between implant placement level and bone loss. Results: Statistically significant differences in bone loss among the 4 groups (P<0.01) and within each group over time (P<0.01) were observed. There was no significant difference between the groups with a wall thickness of 0.75 mm and 0.95 mm. In a multiple comparison, the groups with a supracrestal placement level showed greater bone loss than the epicrestal placement groups. In addition, a significant correlation between implant placement level and marginal bone loss was observed. Conclusions: The degree of bone resorption was significantly higher for implants with a supracrestal placement compared to those with an epicrestal placement.
유상신,김동익,서상호,이병붕,이순정,김형종 대한혈관외과학회 2000 Vascular Specialist International Vol.16 No.1
Purpose: The objective of this study is to investigate the blood cell motion in human capillary by applying the boundary singularity method. Methods: A particle motion of spherical shape falling in a vertical tube filled with Newtonian fluid is studied by using the boundary singularity method and the experiment. Results and Conclusion: As the eccentric ratio increases up to 0.6, the rotational velocity increases almost linearly and the falling velocity remains constant. However, as the eccentric ratio exceeds 0.6, the rotational velocity incre rapidly and the falling velocity decreases. As the tube radius increases, falling velocity increases and approaches the stokes velocity and the rotational velocity decreases.
Articles : Medicinal Chemistry ; Cytotoxicity of Triterpenes Isolated from Aceriphyllum rossii
( Ik Soo Lee ),( Jae Kuk Yoo ),( Min Kyun Na ),( Byung Sun Min ),( Jong Pill Lee ),( Bong Sik Yun ),( Wen Yi Jin ),( Hong Jin Kim ),( Ui Jung Youn ),( Quan Cheong Chen ),( Kyung Sik Song ),( Yeon Hee 영남대학교 약품개발연구소 2008 영남대학교 약품개발연구소 연구업적집 Vol.18 No.-