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      • KCI등재
      • KCI등재

        Predictive Model for the Carbon Concentration Profile of Vacuum Carburized Steels with Acetylene

        정민수,오세훈,이영국 대한금속·재료학회 2009 METALS AND MATERIALS International Vol.15 No.6

        A predictive model for the carbon concentration profile in vacuum carburized steels with acetylene was proposed. The model involves the process and boundary conditions based on the characteristic of vacuum carburizing with acetylene and carbon diffusivity with an alloying element effect. In order to verify the predictive model, the carbon concentration profile of a cylindrical SCM415 steel specimen vacuum carburized with acetylene was calculated using the finite element method. The carbon concentration profile calculated with the alloying element effect, the carbon diffusivity in the Fe-C binary system proposed by Tibbetts, and multiple time steps of carburizing and diffusion exhibited good agreement with the measured carbon profile. A predictive model for the carbon concentration profile in vacuum carburized steels with acetylene was proposed. The model involves the process and boundary conditions based on the characteristic of vacuum carburizing with acetylene and carbon diffusivity with an alloying element effect. In order to verify the predictive model, the carbon concentration profile of a cylindrical SCM415 steel specimen vacuum carburized with acetylene was calculated using the finite element method. The carbon concentration profile calculated with the alloying element effect, the carbon diffusivity in the Fe-C binary system proposed by Tibbetts, and multiple time steps of carburizing and diffusion exhibited good agreement with the measured carbon profile.

      • KCI등재

        스마트카드용 고성능 자바가상기계에 대한 연구

        정민수,Jung, Min-Soo 한국데이터정보과학회 2009 한국데이터정보과학회지 Vol.20 No.1

        스마트카드는 작은 크기의 마이크로 컴퓨터칩을 내장하고 있다. 이 칩은 프로세서, RAM, ROM, 클럭, 버스 그리고 암호전용 코프로세서 등을 포함하고 있다. 따라서 이 칩은 RFID 태그와 비교해서 가격이 비싸고, 복잡하지만 안전한 칩이다. 스마트카드의 주요 응용분야는 전자뱅킹이나 안전한 통신 관련 분야이다. 자바카드는 개방형 플랫폼 중 가장 널리 사용되는데 그 이유는 자바카드의 보안성, 플랫폼 독립성, 그리고 빠른 개발 싸이클 때문이다. 하지만 자바카드는 실행속도가 느리기 때문에 자바 카드의 성능개선은 중요한 연구 분야가 되어왔다. 본 논문에서는 효과적인 트랜잭션버퍼 관리 방법을 제안하여 자바카드의 성능을 개선시켰으며 실험을 통하여 그 성능을 입증하였다. Smart card has a small sized micro computer chip. This chip contains processor, RAM, ROM, clock, bus system and crypto-co-processor. Hence it is more expensive, complicated and secure chip compared with RFID tag. The main application area of smart card is e-banking and secure communications. There are two kinds of smart card platforms; open platform and closed one. Java card is the most popular open platform because of its security, platform independency, fast developing cycle. However, the speed of Java card is slower than other ones, hence there have been hot research topics to improve the performance of Java card. In this paper, we propose an efficient transaction buffer management to improve the performance of Java card. The experimental result shows the advantage of our method.

      • KCI등재

        Perceived Service Quality among Outpatients Visiting Hospitals and Clinics and Their Willingness to Re-utilize the Same Medical Institutions

        정민수,최만규,이건형 대한예방의학회 2009 Journal of Preventive Medicine and Public Health Vol.42 No.3

        Objectives : This study was to determine how the perception and the satisfaction of outpatients who utilized clinics and hospitals are structurally related with their willingness to utilize the same institution in the future. Methods : Three hundred and ten responses (via convenient sampling) were collected from 5 hospitals and 20 clinics located in Seoul listed in the Korea National Hospital Directory 2005 . Service quality was utilized as the satisfaction measurement tool. For analysis, we used a structural equation modeling method. Results : The determining factors for general satisfaction with medical services are as follows: medical staff, reasonability of payment, comfort and accessibility. Such results may involve increased competition in the medical market and increased demands for quality medical services, which drive the patients to visit hospitals on their own on the basis of changed determining factors for satisfaction. Conclusions : The structural equation model showed that the satisfaction of outpatients with the quality of medical services is influenced by a few sub-dimensional satisfaction factors. Among these sub-dimensional satisfaction factors, the satisfaction with medical staff and payment were determined to exert a significant effect on overall satisfaction with the quality of medical services. The structural relationship in which overall satisfaction perceived by patients significantly influences their willingness to use the same institution in the future was also verified.

      • KCI등재

        Factors Related to Perceived Life Satisfaction Among the Elderly in South Korea

        정민수,Carles Muntaner,최만규 대한예방의학회 2010 Journal of Preventive Medicine and Public Health Vol.43 No.4

        Objectives: This study attempted to explore the aging phenomena that now characterize much of Korean society, and assessed issues associated with the life satisfaction experienced during the process of aging. Methods: By employing the National Survey on the State of Life and the Desire for Welfare of the Elderly, 2004 in South Korea this study attempted to identify the factors that determine subjective life satisfaction among the elderly. The data utilized herein consisted of 3278 elderly people aged 65 years or older, from 9308 households. Results: The results of analysis from the final model after the introduction of 19 variables in 8 factors showed statistically similar explanatory power in men (adj. R2 = 0.320) and in women (adj. R2 = 0.346). We found that economic condition was the most influential factor in both men (B = 0.278) and women (B = 0.336) except perceived health condition variables. The second most influential variable in life satisfaction was health checkups in men (B = 0.128) and degree of nutritional diet in women (B = 0.145). Those who had experience with chronic diseases also reported significantly lower perceived life satisfaction and this was particularly true of women. Conclusions: The aging society requires an understanding of the lives of elderly individuals. This study explored factors associated with life satisfaction in old age by using a life satisfaction model. The success of an aging society begins with an accurate understanding of the elderly, and thus political attention will need to be focused on this matter.

      • KCI등재

        reconsidering the determinants of life satisfaction among the elderly in south korea

        정민수,조병희,이충근 한국보건사회학회 2010 보건과 사회과학 Vol.0 No.28

        Older adults with chronic diseases have the lower life satisfaction and years of life remaining in the status of an aging society, South Korea since 2000. They are placed in the lack of family contacts and poorer health insurances,and economic disadvantaged condition as well. The purpose of this study is to understand senescence through colorful determinants concerning the life satisfaction of the elderly. Data were obtained from 2006 Korean Longitudinal Study of Ageing. Sample of this study consists of 3,960 Koreans aged 65years or older have at least one chronic disease. We will measure effects of family types and health insurance conditions on life satisfaction controlling for respondent's socioeconomic factors. Lower life satisfaction might be significantly associated with small family scale and lower social contacts. In case children and spouse don't co‐reside with them particularly, highly significant association with chronic disease prevalence rate and older adults have no family support would be demonstrated. The difference was found in life satisfaction as a level of health insurance with controlling for utilization of medical facilities. Aging is the common social issue of most countries in East Asia. Consequently, it is required that care givers are divided into personal orfamily burden and social burden. Life satisfaction and life expectancy related to these two factors of an advanced age population with chronic diseases could be the evidence of policy intervention approach. Lack of social support and medical accessibility increases fragility and disturbs well‐being in senescence.

      • KCI등재

        북한예방의학회지(1997-2006) 게재논문의 핵심 네트워크 분석

        정민수,정동준,최만규 대한예방의학회 2008 Journal of Preventive Medicine and Public Health Vol.41 No.6

        Objectives : There are very few researches on North Korea s academic activities. Furthermore, it is doubtful that the available data are reliable. This study investigated research activities and knowledge structure in the field of Preventive Medicine in North Korea with a network analysis using co-authors and keywords. Methods : The data was composed of the North Korean Journal of preventive medicine ranged from Vol. 1 of 1997 to Vol. 4 of 2006. It was the matrix of 1,172 articles by 1,567 co-authors. We applied R procedure for keywords abstraction, and then sought for the outcome of network forms by spring-KK and shrinking network. Results : To comprehend the whole networks explicitly demonstrated that the academic activities in North Korea s preventive medicine were predisposed to centralization as similar as South Korea s, but on the other aspect they were prone to one-off intermittent segmentation. The principal co-author networks were formulated around some outstanding medical universities seemingly in addition to possible intervention by major researchers. The knowledge structure of network was based on experimentation judging from keywords such as drug, immunity, virus detection, infection, bacteria, anti-inflammation, etc. Conclusions : Though North Korea is a socialist regime, there were network of academic activities, which were deemed the existence of inducive mechanism affordable for free research. Article keywords has laid greater emphasis on experiment-based bacterial detection, sustainable immune system and prevention of infection. The kind of trend was a consistent characteristic in preventive medicine of North Korea having close correlation with Koryo medical science.

      • SCOPUSKCI등재

        국내 예방의학 분야의 공저자.핵심어 네트워크와 군집 양상 - 대한예방의학회지($1991{\sim}2006$) 게재논문의 분석 -

        정민수,정동준,Jung, Min-Soo,Chung, Dong-Jun 대한예방의학회 2008 Journal of Preventive Medicine and Public Health Vol.41 No.1

        Objectives : This study evaluated knowledge structure and its effect factor by analysis of co-author and keyword networks in Korea's preventive medicine sector. Methods : The data was extracted from 873 papers listed in the Journal of Preventive Medicine and Public Health, and was transformed into a co-author and keyword matrix where the existence of a 'link' was judged by impact factors calculated by the weight value of the role and rate of author participation. Research achievement was dependent upon the author's status and networking index, as analyzed by neighborhood degree, multidimensional scaling, correspondence analysis, and multiple regression. Results : Co-author networks developed as randomness network in the center of a few high-productivity researchers. In particular, closeness centrality was more developed than degree centrality. Also, power law distribution was discovered in impact factor and research productivity by college affiliation. In multiple regression, the effect of the author's role was significant in both the impact factor calculated by the participatory rate and the number of listed articles. However, the number of listed articles varied by sex. Conclusions : This study shows that the small world phenomenon exists in co-author and keyword networks in a journal, as in citation networks. However, the differentiation of knowledge structure in the field of preventive medicine was relatively restricted by specialization.

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