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Ultrasensitive crack-based strain sensors: mechanism, performance, and biomedical applications
김윤남,이준상,강승균 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.3
Accurate and sensitive detection of strain generated from biomechanical motion and metabolism paves the way for diverse biomedical applications, including personalized healthcare, early detection of pathological symptoms, medical robotics, and human–machine interfaces. A crack-based strain sensor provides highly sensitive measurement with flexibility, cost-effectiveness, and simple device fabrication. Here, the working principle of a crack-based strain sensor based on the disconnection and reconnection of cracks is reviewed. Crack geometry and morphology, such as depth, density, and arrangement, which affect the sensitivity, repeatability, and linearity of the sensor, are discussed. Crack formation methods affecting the performance of crack-based strain sensors are also discussed. Lastly, representative biomedical applications of ultrasensitive crack-based sensors as wearable healthcare devices, precise medical tools, and cellular force analyzer are reviewed.
김윤남(Yun Nam Kim),이정일(Jung Il Lee),이성노(Seong No Lee) 한국사회체육학회 2001 한국사회체육학회지 Vol.16 No.-
Being a result of Renaissance Periods art form, Ballet, is still loved world wide and greatly developed. Being the leaders of educating ballet, Russia`s Vaganova Ballet School and England`s Royal Ballet School has history and is recognized by Professionals as a very Organized ballet educating School. In this research, we analyzed the whole education conduct, especially the background of the establishment, admission process, educating goals, curiculum and their artistic character. First, establishment background: Vaganova Ballet School started off as a reform of their retrograding creativity, Royal Ballet School was established by ther belief Ninette de Valois. Second, the admission process:Both schools tare appearance and sense to rythm seriously, especially Vaganova Ballet school emphasizes on sense to rythm and music, Royal Ballet school on imagination and indivisnality. Third, educating goal: Vaganova school`s purpose is to train and educate Ballet dancers, Royal school`s is to not only dancers, but corrdhators and teachers as well. Fourth, The curiculum: Vaganova school is a course of 8years, primary, intermediate, and high level, and they are made for training dancers, Royal school is of intermediate and high level for 6years 3months, and the courses are for general training. Fifth, Artist character: Vaganova school emphasizes expression and feelings, Royal Ballet school on the harmony of movements. Looking at the synthesis of this study Vaganova and Royal Ballet school`s educating method of ballet was very organized and fits their purpose and the system very well. This Kind of organized educating system has been the original face of western ballet`s development. Korea`s history of ballet has been about 70years, but the lack of organized of specialized educating system from early age is a very big problem of the development of ballet. We need to establish a ballet school and in great need of an organized education program for our ballet to be internationally known.
Dirty Dozen 기법에 의한 한국공군의 정비실수 사례분석
김윤남 ( Yun Nam Kim ),조수용 ( Soo Yong Cho ) 대한설비관리학회 2013 대한설비관리학회지 Vol.18 No.1
More than one hundred years have passed since the success of powered flight, and most of technical problems related with flight have overcome. However, still aircraft accidents occur. Safety is the most important thing prior to the flight, but sometimes, some accidents have happened by the minor mistake caused by the ground man. In this study, from the accident cases in ROKAF(Republic Of Korea Air Force), the causes of accidents due to the ground man`s mistake are analyzed using the Dirty Dozen method suggested by the FAA(Federal Aviation Administration). The results show that the "Complacency" and the "Lack of knowledge" are major factor on the accidents due to the ground man`s mistake.
뇌졸중 발생 예측모형을 위한 Cox와 Weibull 모형의 비교 평가
김윤남(Youn Nam Kim),조어린(Ur Rin Cho),남병호(Byung-Ho Nam),박일수(Il Soo Park),지선하(Sun Ha Jee) 한국역학회 2008 Epidemiology and Health Vol.30 No.1
Objective: The objective was to compare Cox proportional hazards model and Weibull model for predicting long-term probabilities for stroke risk in the Korean Cancer Prevention Study(KCPS).<BR> Methods: The subjects comprised of 385,279 Korean aged 55 to 64 years who received health insurance from the National Health Insurance Corporation and who had medical examinations in 1992 and 1995. 70% of the subjects were used for model building and the rest for model evaluation. The final prediction model for stroke includes age, systolic blood pressure, diabetes, total cholesterol and smoking. Subjects were follow-up for identification of incident stroke cases between 1993 and 2005. Comparisons included predicted coefficients of stroke risk factors, incidence probabilities over 10 years, and the area under a receiver operating characteristics (ROC) curve for both Cox"s proportional hazard model and Weibull model.<BR> Results: The average age of study population was 55.5 years in men and 56.3 years in women, respectively. Percentage of men and women in study population were 58.0% and 42.0%, respectively. The study findings satisfied proportionality according to the two models. There was no significant difference in coefficients between the two models of prediction models in men and in women. Moreover, there was no difference in incidence probabilities of stroke and c-statistics. C-statistics were 0.68 for men as same as for women.<BR> Conclusion: There was no difference for the prediction of the stroke risk in the Korean population using Cox"s proportional hazard model and Weibull model, thus the two models were found to be efficient for this purpose.
원주방향 균열 배관에 대한 R6, RCC-MR A16 코드에 의한 1,2 차 복합 하중하에서 J-적분 비교
남현석(Hyun Suk Nam),오창영(Chang Young Oh),김윤재(Yun Jae Kim) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.5
본 논문에서는 R6 코드와 RCC-MR A16 코드에서 원주방향 균열 배관에 대해 제시하는 1,2차 복합 하중하에서 J-적분 계산법에 대한 정량적인 비교를 하였다. 균열의 형상, 균열의 깊이, 2차 하중의 크기 변수에 대한 유한요소 해석을 수행 하였고 유한요소 해석 결과를 이용해 각 코드의 J-적분 평가법에 대한 정량적인 비교를 하였다. R6 코드는 Lr=1 부근에서 보수적으로 평가 되었으며 RCC-MR A16 코드의 경우 기계하중이 작은 영역에서 보수적으로 평가되었다. 이와 같은 결과를 토대로 본 논문에서는 원주방향 균열이 있는 배관에 대하여 각 코드의 J-적분 계산을 보완할 수 있는 방법을 제시하였다. 그 결과로 보완된 J-적분 계산이 유한요소해석 결과와 잘 일치하는 것을 확인 하였다. This paper provides a comparison of the J-integral estimation method under combined primary and secondary stress in the R6, RCC-MR A16 code. The comparisons of each code are based on finite element analysis using ABAQUS with regard to the crack shape, crack depth, and magnitude of secondary load. The estimate of the R6 code is conservative near Lr = 1, and that of the RCC-MR A16 code is conservative near Lr = 0. As a result, this paper proposes a modified method of J-integral estimation in the R6, RCC_MR A16 code. The J-integral using the modified method corresponds to the finite element analysis result.