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Seong-Yong Yoon(윤성용),Frederic Barlat 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In this work, a new strategy to integrate stress without an iterative root-finding process is introduced using a generalized form of the effective plastic strain increment for the purpose of reducing the computational cost of FE-simulations where advanced theoretical plasticity models are implemented. The accuracy and robustness of the method are validated through material anisotropy prediction at a variety of time increments by implementing anisotropic yield functions into the finite element framework. The results of the current method are compared to that of the Euler backward and analytical methods. Moreover, the earing prediction quality after a cup drawing FE-simulation and the associated computational efficiency are comparatively studied.
윤성용 ( Seong Yong Yoon ),이재국 ( Jae Gook Lee ),류시원 ( See Won Ryu ) 한국병원경영학회 2010 병원경영학회지 Vol.15 No.4
Objectives: This study was supposed to investigate factors which influence to preference of medical tourism products of Japanese tourists in Seoul, Korea. Methods: Data were collected from 228 Japanese tourists who visited `Seoul Center for Culture & Tourism` in Myeong-dong, Seoul, Korea. We measured factors which influence to preference for medical tourism. The data were analyzed by T-test, ANOVA, and multiple regression analysis. Results: The major findings were as follows; Japanese tourists preferred medical products in the order of skin care, oriental medicine treatment, health screening, and scaling & teeth whitening. They considered technical level of medical staff most importantly, followed by safety of medical products, communication during diagnosis and treatment, follow-up service, modernization of medical facilities and equipment, and the reasonable medical expenses. Japanese tourists` preferred medical institutions in the order of a university hospital, a specialty clinic, a special hospital, They said they intend to pay 50,000 to 150,000 yen for medical tourism. The preference to medical tourism products are that single women group in their twenties and thirties for skin care, married people group aged over thirties preferred oriental medicine treatment, and married men aged over forties and high income earners favored health screening. Conclusions: It should be considered carefully that the preference exists on some factors especially for Japanese tourist. Further research about preference on medical tourism products for tourists from the other countries is required appropriately to fulfill the needs.
김순신,우극현,윤성용,임현술,김근배,유승도,조용성,이석용,이현수,양원호,Kim, Sunshin,Woo, Kuck-Hyeun,Yoon, Seong-Yong,Lim, Hyun-Sul,Kim, Geun-Bae,Yu, Seung-Do,Cho, Yong-Sung,Lee, Seokyong,Lee, Hyunsu,Yang, Wonho 한국환경보건학회 2015 한국환경보건학회지 Vol.41 No.1
Objectives: The purpose of this study was to propose an indirect exposure assessment method using a questionnaire survey at a time when direct exposure assessment would be impossible after a chemical accident. Methods: About two weeks after an accident, a questionnaire survey was performed with 1,264 persons from the local community. Variables related to exposure were extracted from the survey contents, weighted and then graded for comparison with subjective symptoms in order to evaluate the extent of exposure. Survey items suitable for reflecting the previous exposure level during the accident were extracted, weighted and divided into quartile ranges. Subjective symptoms showed an increasing tendency with higher exposure level when compared with final exposure level (p<0.01). Results: For the relationship between the final exposure grade and subjective symptoms, as the exposure grade was increasing the rates complaining of symptom also showed an increasing tendency. However, when adjusted for demographic characteristics, there was a tendency for the eye irritation symptom to appear higher in women, and respiratory organ irritation appeared higher in smokers. Conclusions: When the problem of recall bias is considered, this study may not have completely unraveled exposure and the characteristics of the participants can affect subjective symptoms. Nevertheless, the exposure rating method of using a questionnaire showed a significant relationship with symptom level. It can be deemed that assessment of past exposure may be successfully evaluated by questionnaire in cases such as chemical accidents.
Hong-Sang Park(박홍상),Seong-Yong Yoon(윤성용),Frederic Barlat 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In this work, an alternative way to identify a non-quadratic yield function, namely, Yld2000-2d is introduced in order to enhance the predictivity of the plane strain deformation mode. The yield function coefficients are determined by two ways: 1) analytical approach considering approximated plane strain stress and 2) inverse method where both the multiaxial stress states and R-values are involved. The characterized yield functions are comparatively studied by means of blank thickness prediction in hole expansion simulation.
국내외 농업인 천식 및 만성 폐쇄성 폐질환에 관한 고찰
김시영(Siyoung Kim),윤성용(Seongyong Yoon),김진석(Jinseok Kim),조성용(Seong-yong Cho),박현우(Hyun Woo Park),김대환(Daehwan Kim),김가영(Gayoung Kim),강지수(Jisoo Kang),김경수(Kyungsu Kim),최동필(Dongphil Choi),유석주(Seok-Ju Yoo) 한국농촌의학 지역보건학회 2023 농촌의학·지역보건 Vol.48 No.4
본 연구는 국내 농업인의 천식 및 만성 폐쇄성 폐질환을 파악하기 위해「농업인의 업무상 질병 및 손상조사」를 조사하였다. 관련된 국내연구 자료가 미비하여 국외 농업인의 천식 및 만성폐쇄성 폐질환 연구결과를 찾아보았고, 그 결과. 국내 농업인들의 천식 및 만성 폐쇄성 폐질환 유병률은 국외 연구 결과들보다 낮게 나타났다. 실제 국내 농업인의 호흡기 질환 유병률은 더 높을 수 있으므로, 추가적인 연구가 필요하고, 호흡기 질환 예방대책이 마련되어야 한다. Objective: Farmers are known to have high prevalence of asthma and chronic obstructive pulmonary disease(COPD). This study aims to investigate the current status of asthma and COPD in domestic and foreign farmers with the ultimate goal of raising awareness of asthma and COPD among farmers and contribute to supporting evidence for the prevention of respiratory diseases in farmers. Methods: The study utilized data from the Farmer’s Occupational Disease Survey, conducted by the Rural Development Administration, to determine the prevalence of respiratory diseases in domestic farmers. The prevalence of asthma and COPD in overseas farmers was evaluated by researching other foreign studies and articles. Results: The prevalence of asthma and COPD in domestic farmers was less than of foreign farmers’. The prevalence of asthma in domestic farmers was high as upto 8.4% and COPD upto 5.5%. Studies from Europe and America showed prevalence of asthma in farmers high as upto 14.8% and COPD upto 17.1%. Conclusions: This study conducted an investigation using the Survey on Occupational Diseases and Injuries in Farmers to understand the current status of asthma and COPD in domestic farmers. Due to a lack of relevant domestic research, we examined and compared with the research results on asthma and COPD among overseas farmers. Further research is necessary and preventive measures for respiratory diseases need to be developed.