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박성재(Park Seung Jae),마창남(Ma Changnam Jae),박명균(Park Myoung Gyun),이두화(Lee Duwha) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Recently, railway has been pointed to the efficiency of transportation, rapid transit, and comfortable train ride. the construction of railway near the downtown area and station building are increasing for maximization of utilization and convenience. but the heavy of transportation and rapid transit lead to increase noise and vibration. the noise and vibration of railway may cause the civil appeal, decline in the serviceability and insufficiency of environmental standard. Therefore, the solution to avoid environmental matters becomes one of the most important factor in constructing railway. In this study, analysis fatigue stress joint of low vibration floating slab-anti vibration equipment is carried.
박종돈,강창남,이제홍 한국통상정보학회 2000 통상정보연구 Vol.2 No.1
IT 혁명으로 전자적인 활동이 전 사회의 중심 축으로 이루어지고, 또한 컴퓨터를 이용한 정보처리와 통신기술의 눈부신 발달에 힘입어 기업의 Business에 커다란 변화를 초래하게 되었다. 특히, 인터넷이라는 환경하에서 전자상거래는 급속하게 성장하고 있으며, 기업은 전자상거래 모델을 앞다투어 개발하면서 새로운 E-Business 환경을 수용하고 있다. 또한 기업은 무역업무에 이러한 전자상거래를 도입하면서 국제간 거래의 활성화를 위해 노력하고 있지만, 국제간 사이버 무역이 안고 있는 여러 가지 에로점을 가지고 있다. 그 중에서 국제간 전자결제에 관한 문제이다. 인터넷을 이용한 무역업무를 실행시키고, 활성화하기 위한 하나의 결제방안을 제시해 보면 제3자에 의한 결제 시스템으로서 인터넷 서비스 제공업자, S/W 개발업체, 은행과 신용카드회사를 비롯한 금융기관 등은 결제시스템을 구축하는 방안이 강구될 수 있다. 또한 이 시스템에서는 다양한 판매자의 제품을 소개하고 일정 시간간격 또는 특정 구매자의 총누적 거래대금이 일정수준에 이를 때에 결제함으로써 신용카드를 지불수단으로 사용하는 경우에도 소액거래를 지원할 수 있다. 또한 전자결제제도가 성립되기 위해서는 전자자금거래의 규제를 위한 법·제도적인 측면의 정비가 시급하다. 따라서 각종 거래의 결제에 관한 법률관계는 물론 금융관련 법률을 기본으로 하여 새로운 접근방안을 마련해야 할 것이다. 이와 같은 사항들을 고려함으로써 사이버 환경의 활성화를 도모할 수 있다.
Kim Changnam,Ahmed Oli,Park C. Hyung Keun,Chung Seockhoon 대한신경정신의학회 2022 PSYCHIATRY INVESTIGATION Vol.19 No.6
Objective In this study, we aimed to develop a Korean version of the Coronavirus Reassurance-Seeking Behaviors Scale (CRBS) and to explore its reliability and validity among the general population in South Korea.Methods Using an online survey conducted during November 9–15, 2021, we collected the demographic data of 400 individuals and their responses to rating scales such as the CRBS, the Stress and Anxiety to Viral Epidemics-6 items (SAVE-6), the Generalized Anxiety Disorder-7 items (GAD-7), and the Patient Health Questionnaire-9 items (PHQ-9). We conducted factor analyses and utilized item response theory to confirm the validity and reliability of the Korean version of the CRBS.Results Factor analyses revealed that the single factor model of the Korean version of the CRBS showed a good fit with the CRBS (χ<sup>2</sup>=5.475, df=5, p value=0.361, χ<sup>2</sup>/df=1.095, CFI=0.999, TLI=0.998, RMSEA=0.015). Multigroup CFA results indicated that the CRBS measures reassurance-seeking behaviors consistently across variables of sex, depression, general anxiety, and viral anxiety. The CRBS also exhibited good convergent validity with the SAVE-6 (r=0.431, p<0.001), GAD-7 (r=0.574, p<0.001), and PHQ-9 (r=0.575, p<0.001).Conclusion The CRBS is a reliable and valid rating scale that measures reassurance-seeking behavior in relation to viral epidemics.
하중평형 격자법을 이용한 자동차용 플라스틱의 진응력-진변형률 선도의 개선
박충희(Chunghee Park),김진성(Jinsung Kim),허훈(Hoon Huh),안창남(Changnam Ahn),최석진(Seokjin Choi) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
This paper is concerned with the tensile characteristics of auto-body plastics at strain rates ranging from 0.001/sec to 100/sec. The tensile characteristics at high strain rates are important in prediction of deformation modes of the plastic components which undergo the high-speed deformation during car crash. Uniaxial tensile tests at the quasi-static strain rate were conducted at strain rates ranging from 0.001/sec to 0.01/sec by using a tensile testing machine (INTRON 5583). Uniaxial tensile tests at the intermediate strain rate were conducted at strain rates ranging from 0.1/sec to 100/sec by using a high-speed material testing machine developed. Since the deformation of the plastics is accompanied with localized deformation and a conventional extensometry method(CEM) is no longer valid for strain measurement, a force equilibrium grid method(FEGM) is newly proposed in order to acquire accurate true stress-true strain curves of the plastics. FEGM is utilized with image capture of non-uniform distribution of deformation at each elongation stage from a high speed camera in aids of grid methods. The true stress-true strain relations at the designated true strain rate and increment were obtained by collecting the load data by the equilibrium and the deformation images.
격자법을 이용한 자동차용 플라스틱의 진응력-변형률 선도 도출
박충희(Chunghee Park),김진성(Jinsung Kim),허훈(Hoon Huh),안창남(Changnam Ahn),최석진(Seokjin Choi) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The plastics are widely utilized in the inside of vehicles. The dynamic tensile characteristics of auto-body plastics are important in a prediction of deformation mode of the plastic component which undergoes the high speed deformation during car crash. This paper is concerned with the dynamic tensile characteristics of the auto-body plastics at intermediate strain rates. Quasi-static tensile tests were carried out at the strain rate ranged from 0.001/sec to 0.1/sec using the static tensile machine (Instron 5583). Dynamic tensile tests were carried out at the strain rate ranged from 1/sec to 100/sec using the high speed material testing machine developed. Conventional extensometry method is no longer available for plastics, since the deformation of plastic is accompanied with localized deformation. In this paper, quasi-static and dynamic tensile tests were performed using ASTM Ⅳ standard specimens with grids and images from a high speed camera were analyzed for strain measurement. True stress-strain relations and the strain rates at each deformation step were obtained by processing load data and deformation images, assuming the plastics to deform uniformly in each grid.
崔寬三,辛昌男,朴種聲 忠南大學校 環境問題硏究所 1986 環境硏究 Vol.4 No.1
In the previous study we reported that the four different types of vegetation on Mt. Chil- gab. The northern mountain ridge and the top area were dominated by Quercus sp., and southern slope was dominated by Pinus sp., but southwest ridge of Janggok temple area was cooupied by the mixted forest. In this paper, the authors present the results of comparative study of phytosociological plant community structures between the north slope area and southwest valley area of Janggok temple. The productivity of herbs under the two different plant communities was not closely related to soil nutrients and climatic conditions. The soil of southweat valley showed higher values in minerals, organic matters and C. E. C. than those of the north slope area. However, the dry matter productivity of grass land at north slope area was 4- fold of that at southwest valley. It was suggested that the productivity of herbs was not only influenced by soil properties but also by light environment.