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마찰에 의한 열탄성 불안정성에 대한 경사기능재료의 영향
이승욱(Seung Wook Lee),윤성은(Seong Eun Yun),장용훈(Yong Hoon Jang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
An analytical analysis is developed for the two-dimensional thermoelastic contact problem considering a the FGM half-plane sliding against a rigid non-conducting body at speed V to investigate thermoelastic instability due to frictional heating at the interface. The effect on non-homogeneity of FGM on thermoelastic instability shows that there is an optimal non-homogeneity which gives the maximum critical speed.
절삭가공 시 설계, 가공, 측정을 융합한 MES 시스템 구축에 관한 연구
박해웅,이승욱,한희봉,윤재웅,최계광,한성렬,김경아,이춘규,Park, Hae-Woong,Lee, Seung-Wook,Han, Heui-Bong,Yun, Jae-Woong,Choi, Kye-Kwang,Han, Seong-Ryeol,Kim, Kyung-A,Lee, Chun-Kyu 한국금형공학회 2021 한국금형공학회지 Vol.15 No.2
In this paper, when manufacturing large/multi-mold parts (more than 30 core parts),A mold manufacturing (tolerance) management system was established through design-processing linkage.The mold manufacturing (tolerance) management system is a design-based measurement shape/measurement position determination system, M/C processing-linked measurement drive system,It is composed of four parts: CAD-linked measurement result analysis system and manager mold part quality management system.In addition, the constructed system was applied to the field and the effect of system construction was evaluated by comparing it with the existing process.As a result of the evaluation, the measurement precision is within 0.02mm, and the time it takes to measure after the end of processing is shorter than that of the existing process.(12 hours → 2 hours) It was shortened to 16.7%.In addition, it was confirmed that the time required for reprocessing after measurement was reduced by 25% (4 hours → 1 hour) compared to the existing process.
고선량률(HDR) 근접치료의 동위원소 Ir-192에 대한 측정방법에 관한 고찰
백태성,이승욱,나수경,Baek, Tae-Seong,Lee, Seung-Wook,Na, Soo-Kyong 대한방사선치료학회 2007 대한방사선치료학회지 Vol.19 No.1
Purpose: To compare of the accuracy among various measurement procedures of HDR Brachytherapy, and to evaluate the clinical suitability and usefulness of alternative PMMA (polymethylmethacrylateplastics: $C_5H_8O_2$) plate phantom without any additional cost due to the purchase of measuring apparatus. Materials and Methods: We made a comparative study on three types of measuring systems: well type chamber, source calibration jig, and PMMA plate phantom. Farmer type chamber was used for source calibration jig method and PMMA plate phantom method. Measurement was done 5 times each in comparison with the measurement values from manufacturer. Measurement results from experiment were compared with that from the manufacturer which is offered with the source whenever a source is substituted by a new one and evaluate the accuracy of source activity. Results: As a consequence of Ir-192 source measurement using well type chamber, source calibration jig and PMMA plate phantom, RMS (Root Mean Square) values for the relative error are 0.6%, 1.57%, 2.1%, respectively, compared with the data from manufacturer. And the mean errors with standard deviation are given $-0.2{\pm}0.5%$, $0.97{\pm}1.23%$, $-0.89{\pm}1.87%$ respectively. Conclusion: From the results shown by the three types of measurement system (well type chamber, source calibration jig, and PMMA plate phantom), the measurement with well type chamber produced the best accuracy. It turns out that we can also use the alternative system of PMMA plate phantom clinically without purchasing any additional particular apparatus since the system does not exceed the recommendation of AAPM (American Association of Physicists in Medicine), which requires the error range of within ${\pm}5%$.
임승현(Lim Seung-Hyun),고성경(Ko Seong-Kyeong),이종삼(Lee Jong-Sam),전중기(Jun Jung-Gi),이승욱(Lee Seung-Wook) 대구대학교 인문과학연구소 2010 人文科學硏究 Vol.34 No.-
The purpose of this study was provide the effective way of prevention injury and ultimately earlier return to the competition. It was analyzed the frequency and area of injury occurrence during competition period throughout the whole year. The causes and the time of the injury occurrence, and the way of treatment and prevention were examined from total 310 adults recreational volleyball players. Regardless of gender and position differences, it was shown that the highest injury occurrence time was the winter season and Sunday. The major causes of injuries were included that the lack of warm up exercise and the foul committed by the other team's player. As far as the movement is concerned, most if the injuries were occurred during blocking for men's games and receiving for women's game. The injury region of the body was lower extremities, ankle, arm and wrist, and waist by orderly. When the types of the injury were considered, muscle and ligament sprain and tendinitis, joint and bone problems were the major occurred was using airspray types of cataplasm. The education for the preventing of the injury prevention is tendency of increasing, and all players participating for the recreational volleyball games are being endeavored for increase their warm up time before initiate the main games.