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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.
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.
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.
남현석,김지수,Ho-Wan Ryu,김윤재,김진원 한국원자력학회 2016 Nuclear Engineering and Technology Vol.48 No.5
This paper presents a numerical method to simulate ductile tearing in cracked components under high strain rates using finite element damage analysis. The strain rate dependence on tensile properties and multiaxial fracture strain is characterized by the model developed by Johnson and Cook. The damage model is then defined based on the ductilityexhaustion concept using the strain rate dependent multiaxial fracture strain concept. The proposed model is applied to simulate previously published three cracked pipe bending test results under two different test speed conditions. Simulated results show overall good agreement with experimental results.