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이원희,서종현,김준,강승호,김국한,정승현,김광기,강현귀,Lee, Wonhee,Seo, Jong Hyun,Kim, Jun,Kang, Seung Ho,Kim, Gook Han,Chung, Seung Hyun,Kim, Kwang Gi,Kang, Hyun Guy 대한의용생체공학회 2016 의공학회지 Vol.37 No.1
A pressure measurement system was developed to verify magnitude and position of transferred pressure on the body surface during the intermittent pneumatic compression (IPC) which is one of the most well-known methods for the prevention of deep vein thrombosis (DVT). Eighty force sensing resistors (FSR) were arranged on a mannequin leg and a hardware controller sensed, digitized, and transferred pressure data every second while IPC was being applied. Finally, sensed pressure data were color coded and visualized on the 3D model with lab-developed software. The pressure data were also saved to files for further analysis. Using this measurement system, the changing pattern of pressure was measured on the mannequin leg by changing both chamber pressure and cuff tightness. As a result, net pressure transferred onto the body surface is dependent on chamber pressure and cuff tightness. Under the same chamber pressure, the tighter a cuff was worn, the wider compressed area was and the shorter compression cycle was. Also transferred pressure was proportional to both chamber pressure and cuff tightness.
광 경화성 수지를 이용한 파우더 기반의 3DP 공정 및 강도 특성
이원희(Wonhee Lee),김동수(Dongsoo Kim),김정수(Jungsu Kim),이택민(Taikmin Lee),신동윤(Dongyun Shin),이민철(Mincheol Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
3DP(three dimensional printing) technology is one of SFF(solid freeform fabrication) technologies which have recently come into a spotlight due to its adaptability to various applications. This technology has a great advantage in terms of short fabrication time for a prototype at a low cost, especially when it comes with multi-nozzle inkjet printing technology. However, it has also a disadvantage since it requires additional curing time, after jetting a binder material, and post-processing time in order to increase the mechanical strength of a product. In this study, a novel 3DP process is proposed to overcome slow solidification and elaborate post-process by adopting photo curing method into the conventional 3DP process. Mechanical properties, such as tensile and bending strengths, of specimens fabricated with the proposed 3DP process were measured and compared with those fabricated with the conventional 3DP process. As a result, it is found that mechanical strengths of specimens from the proposed novel 3DP process show over 10 times higher than those from the conventional 3DP process.
이원희(Wonhee Lee),김동수(Dongsoo Kim),김정수(Jungsu Kim),이민철(Mincheol Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
3DP(three dimensional printing) technology is one of SFF(solid freeform fabrication) technologies which have recently come into a spotlight due to its adaptability to various applications. This technology has a great advantage in terms of short fabrication time for a prototype at a low cost, especially when it comes with multi-nozzle inkjet printing technology. However, it has also a disadvantage since it requires additional curing time, after jetting a binder material, and post-processing time in order to increase the mechanical strength of a product. In this study, a novel 3DP process is proposed to overcome slow solidification and elaborate post-process by adopting photo curing method into the conventional 3DP process. Mechanical properties, such as tensile and bending strengths, of specimens fabricated with thc proposed 3DP process were measured and compared with those fabricated with the conventional 3DP process. As a result. it is found that mechanical strengths of specimens from the proposed novel 3DP process show over 10 times higher than those from the conventional 3DP process.
이원희(Wonhee Lee),김동수(Dongsoo Kim),김정수(Jungsoo Kim),이민철(Mincheol Lee),장민호(Minho Jang) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
The digital three dimensional (3D) real object duplication system (RODS) consist of a optical 3D scanner and a solid freeform fabrication (SFF) system for office type. It can scan a 3D object rapidly, transmit data to other system and reproduce the copy thereof rapidly. In this research, full automatic 3D scanner and SFF system was developed. The 3D scanner has the motion stage of four axes. And the SFF system developed based on three dimensional printing (3DP) process. Also, the performance of developed system was evaluated. As the result, the duplication error of part was 300,㎛(X), 300,㎛ (Y), and 800,㎛(Z) respectively.
이원희(Lee, Wonhee) 한국청소년정책연구원 2015 한국청소년연구 Vol.26 No.3
본 연구는 청소년지도사 효능감 측정도구를 개발하고, 타당성을 검증하는 것이다. 이를 위해 자기효능감 관련 이론과 이와 관련된 측정도구 및 청소년지도사 직무분석 등 관련 선행연구를 통해 초기문항을 개발하였다. 개발된 문항은 전문가의 내용타당도 검증과 예비 조사를 통해 문항에 대한 적절성과 양호도를 검토하였다. 본 조사에서 문항분석을 실시한 결과 정규성의 가정을 성립하는 것으로 나타났으며, 요인분석 결과 4개 하위요인별 각각 7문항으로 구성된 28문항이 추출되었다. 1요인은 ‘직무 자신감’, 2요인은 ‘프로그램운영 조절효능감’, 3요인은 ‘직무 난이도선호’, 4요인은 ‘직무 귀인’이라 명명하였다. 청소년지도사 효능감 전체와 하위요인 간 상관은 0.69∼0.81, 하위요인 간 상관은 0.34∼0.61로 유의미한 정적상관을 나타내었고, Cronbach’s α는 0.90으로 나타났다. 확인적 요인분석을 통한 구성타당도 평가 결과 χ2/df는 2.304, TLI는 0.919, CFI는 0.930, RMSEA는 0.053으로 나타나 본 연구의 모형 적합도가 수용 가능함을 확인하였으며, 평균분산추출지수와 개념신뢰도가 유의미하게 나타나 수렴타당도, 구성타당도 및 판별타당도가 확보되었다. 또한, 타당화 조사를 실시하여 공인타당도, 수렴타당도 및 교차타당도가 입증하였다. 이러한 결과를 통하여 청소년지도사의 직무 상황과 관련한 직무 수행성과를 예측하는 유용한 도구로 사용되기를 바라며, 청소년지도사 효능감 증진프로그램의 개발 및 적용을 위한 진단 및 평가도구로 사용되기를 기대한다. The purpose of this study was to develop a scale tool for Youth Leader Efficacy and to verify the validity of this scale. In the process, a youth leader efficacy preliminary scale was derived from literature on the subject of self-efficacy, self-efficacy scale tool and Youth Leaders’ jobs classifications. We then reviewed the adequacy and quality factors for the chosen items through a pilot test and the content validity according to an outside expert. In terms of the ‘Main survey’, factor analysis resulted in 7 items being extracted for 4 respective sub-organizing factors, which resulted in 28 items in total. The correlation between Youth Leader Efficacy and the 4 sub-organizing factors is significantly positive 0.69-0.81, as well as between the sub-organizing factors 0.34-0.61. Fourthly, Cronbach’s α of all items was 0.90. The construct validity evaluation through confirmatory factor analysis indicated a result of 2.304 for χ²/df, 0.919 for TLI, 0.930 for CFI and 0.053 for RMSEA, which confirmed the fact that the model fit of this research was acceptable. In the concluding sections of this paper, the limitations of this study and future research directions were also discussed.