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액체금속로 Y-구조물의 비탄성 열응력 해석 및 손상평가에 관한 유한요소해석
곽대영,임용택,김종범,이형연,유봉,Kwak, D.Y.,Im, Y.T.,Kim, J.B.,Lee, H.Y.,Yoo, B. 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.7
LMFBR(Liquid Metal Fast Breeder Reactor) vessel is operated under the high temperatures of 500-550.deg. C. Thus, transient thermal loads were severe enough to cause inelastic deformation due to creep-fatigue and plasticity. For reduction of such inelastic deformations, Y-piece structure in the form of a thermal sleeve is used in LMFBR vessel under repeated start-up, service and shut-down conditions. Therefore, a systematic method for inelastic analysis is needed for design of the Y-piece structure subjected to such loading conditions. In the present investigation, finite element analysis of heat transfer and inelastic thermal stress were carried out for the Y-piece structure in LMFBR vessel under service conditions. For such analysis, ABAQUS program was employed based on the elasto-plastic and Chaboche viscoplastic constitutive equations. Based on numerical data obtained from the analysis, creep-fatigue damage estimation according to ASME Code Case N-47 was made and compared to each other. Finally, it was found out that the numerical predictio of damage level due to creep based on Chaboche unified viscoplastic constitutive equation was relatively better compared to elasto-plastic constitutive formulation.
CHABOCHE 통합 점소성 구성방정식을 이용한 재료거동해석
곽대영,임용택,김종범,이형연,유봉,Kwak, D.Y.,Im, Y.T.,Kim, J.B.,Lee, H.Y.,Yu, B. 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.11
Service conditions for structures at elevated temperatures in nuclear power plant involve transient thermal and mechanical load levels that are severe enough to caeuse inelastic deformations due to creep and plasticity. Therefore, a systematic mehtod of inelastic analysis is needed for the design of structural components in nuclear poser plants subjected to such loading conditions. In the present investigation, the Chabodhe model, one of the unified viscoplastic constitutive equations, was selected for systematic inelastic analysis. The material response was integrated based on GMR ( generallized mid-point rule) time integral scheme and provided to ABAQUS as a material subroutine, UMAT program. By comparing results obtaned from uniaxial analysis using the developed UMAT program with those from Runge-Kutta solutions and experimentaiton, the validity of the adopted Chaboche model and the numerical stability and accuracy of the developed UMAT program were verified. In addition, the developed material subroutine was applied for uniaxial creep and tension analyses for the plate with a hole in the center. The application further demonstrates usefulness of the developed program.
곽대영(Dae Young Kwak) 한국관광연구학회 2011 관광연구저널 Vol.25 No.4
The objectives of this study are to investigate product choice attributes of medical tourists. To achieve these objectives, as a conceptual framework of the study, the concept of medical tourism, the products of medical tourism and previous major studies on product choice attributes of medical tourists were reviewed. and the empirical studies on foreign medical tourists` opinions about product choice attributes were conducted. According to the findings of this study, the following suggestions were presented to the related industries. First, they are required to make efforts to commercialize our medical technologies and promote them to foreign countries. Second, the system that has experts who have foreign language skill and professionalism in medical service and tourism trained and supplied is needed to improve communication problem. Third, after market segmentation based on various criteria including price, they have to make products for each market in order for customers to get the right of choice. Fourth, through conciliation of medical institutions between countries or establishment of branch hospital, the system that patients can take medical service continuously after going back to their countries is required.
Lactobacillus crispatus KLB46의 스트레스 전처리시 열 내성 증진효과
곽대영(Dae-Yung Kwak),강창호(Chang-Ho Kang),전한을(HanEul Jeon),소재성(Jae-Seong So) 한국생물공학회 2014 KSBB Journal Vol.29 No.2
Lactobacilli, the dominant species of microorganisms in the vaginal flora of healthy women, play important roles to prevent bacterial vaginosis and other sexually transmitted diseases. In this study, we carried out studies on stress adaptation prior to various stress treatment. We found that heat or salt adapted KLB46 showed higher cell viability than non adapted upon heat stress at 60℃ for 20 min. When chloramphenicol was added during the adaptation process, heat tolerance was abolished. This result suggested that de novo protein synthesis was essential during adaptation.
외국인 환자의 국내 의료관광 상품만족도에 관한 연구 -의료서비스 분야별 차이검증을 중심으로-
곽대영 ( Dae Young Kwak ) (사)한국마이스관광학회(구 한국컨벤션학회) 2013 MICE관광연구 Vol.13 No.1
The objectives of this study are to investigate foreign patients` satisfaction levels with domestic medical tourism products. To achieve these objectives, as a conceptual framework of the study, the concept and definition of medical service, and medical service quality and satisfaction were reviewed, and the empirical studies on the satisfaction levels of foreign patients who have received domestic medical or health care services were conducted. According to the findings of this study, the following suggestions were presented to the domestic healthcare and medical institutions. First, domestic healthcare and medical institutions, especially small private hospitals and clinics are required to improve and equalize their overall service qualities including service mind and communication skill of medical team and other employees, medical and other facilities, service procedures and costs through comparing with domestic and overseas advanced healthcare and medical institutions` those. Second, dermatology clinics which were low estimated comparatively in satisfaction level should try to enhance their overall service qualities continually by comparing with other departments`, and health spa need to improve employees` communication skills.
곽대영 ( Dae Young Kwak ) (사)한국마이스관광학회(구 한국컨벤션학회) 2014 MICE관광연구 Vol.14 No.3
The objective of this study is to suggest useful directions for exhibitor attracting strategy of exhibition organizers through dividing the exhibitors who participated in the exhibitions, ``Electronics Manufacturing Korea 2014`` and ``The 29th Korea World Travel Fair``, into several groups by exhibition choice attribute, and comparing and analyzing the differences among the groups. To achieve the objective, as conceptual framework of the study, the literature on concept and effect of exhibition, and exhibitor``s exhibition choice attribute were reviewed, and the empirical study on exhibitors`` perception about exhibition choice attribute was conducted. According to the findings of this study, the following suggestions were presented to exhibition organizers. First, for the exhibitors belonging to the group1 named passive ``external factor`` pursuit type, exhibition organizers are needed to try to choice well known exhibition center and to promote exhibition actively through various mass media and to enhance their operation ability continuously. Second, for the exhibitors belonging to the group2 named ``sale activity factor`` pursuit type, exhibition organizers will have to set conditions in order to take place a lot of sales via exhibition. Third, for the exhibitors belonging to the group3 named active ‘choice attribute factor’ pursuit type, exhibition organizers will have to make preparations not just only for the conditions for the above 2 types but also for the conditions for remaining 2 choice attribute factors, which are ``internal factor`` related to marketing strategy and ``non sales activity factor`` relevant to various information gathering and distribution channel investigation.
국제관광전시회 참여업체의 재 참여의사에 영향을 미치는 요인
곽대영 ( Dae Young Kwak ) (사)한국마이스관광학회(구 한국컨벤션학회) 2014 MICE관광연구 Vol.14 No.1
The objective of this study is to suggest useful directions for domestic exhibition organizers through investigating and analyzing the factors affecting reparticipation intention of international tourism show``s exhibitor. To achieve the objective, as conceptual framework of the study, the literature on tourism exhibition and the factors affecting reparticipation intention of exhibition were reviewed, and the empirical study on exhibitors`` perception of international tourism exhibitions about reparticipation intention of exhibition was conducted. According to the findings of this study, the following suggestions were presented to domestic exhibition organizers. First, exhibition organizers are needed to try to induce noted institutions and companies in tourism field to participate their exhibitions, and to promote them through various media in order for the exhibitors to achieve participation results. Second, it is necessary for exhibition organizers to benchmark foreign renowned exhibitions to enhance operation and facility quality of their exhibitions. Third, exhibition organizers are needed to try to host noted exhibitions, and to increase their reputation as exhibition organizer and maintain it.