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김현석 한국항만경제학회 2022 韓國港灣經濟學會誌 Vol.38 No.2
In this study, we estimate the quantile-regression framework of the shipping industry for theCapesize used ship, which is a typical raw material transportation from January 2000 to December 2021. This research aims two main contributions. First, we analyze the relationship between the Capesize used ship, which is a typical type in the raw material transportation market, and the freight market, for which mixed empirical analysis results are presented. Second, we present an empirical analysis model that considers the structural transformation proposed in the Hyunsok Kim and Myung-hee Chang(2020a) study in quantile-regression. In structural change investigations, the empirical results confirm that the quantile model is able to overcome the problems caused by nonstationarity in time series analysis. Then, the long-run relationship of the co-integration framework divided into long and short-run effects of exogenous variables, and this is extended to a prediction model subdivided by quantile. The results are the basis for extending the analysis based on the shipping theory to artificial intelligence and machine learning approaches. 본 연구는 2000년 1월부터 2021년 12월까지의 대표적 원자재 운송 수단인 Capesize 중고선가를 대상으로 해운산업에 대한 분위수 모형을 추정한다. 본 연구는 두 가지 학술적 기여를 목표로 한다. 첫째, 혼재된 실증분석 결과가 제기되는 원자재 운송 시장의 대표적 선종인 Capesize 중고선과 운임시장의 연관성을 분석한다. 둘째, 분위수 회귀로 김현석·장명희(2020a) 연구에서 제기하는 구조변환을 고려하는 실증분석 모형을 제시한다. 분석 결과는 분위수 모형은 시계열 자료에서 구조변화를 분석에 반영함으로써 오차의 불안정성으로 제기되는 문제를 우회할 수 있음을 확인한다. 그리고 공적분 모형의 장기 균형관계를 장기와 단기 추정변수를 통해 외생변수의 장·단기 영향으로 구분하고, 이를 분위별로세분화한 예측으로 확장한다. 이상의 추정결과는 해운 이론모형에 기반한 분석을 인공지능과 기계학습으로 확장할 수 있는 근거가 된다.
連續橫斷切片法에 依한 上肢의 筋 및 骨面積에 關한 硏究
金顯錫 충남대학교 대학원 1975 論文集 Vol.4 No.-
In order to study surface area of bone, muscle and residual portion, and interrelationship of surface area among them in cross section of the arm, author made 17 cross section slices on the arm of 5 Korean men by slicing machine and measure 1 surface area of them in each slices. Results were summarized as follows; 1) Surface area of Humerus was largest at the level of 9 and smallest at the level of 6, in the Radius largest at the level of 17, smallest at the level of 14, and in the ulna largest at the level of 9, smallest at the level of 16. 2) At the level 1, muscle surface area of the arm was largest but percentage of muscle surface area to total surface area was largest at the level 13. 3) Surface area of bone, muscle and residual portion was not in proportion to total surface area.
대학수학능력시험 수험생들의 한의과대학 진학 동기 및 한의의료에 대한 인식 조사
김현석,김휘문,김현호,Kim, Hyun-Seok,Kim, Hwimun,Kim, Hyunho 대한예방한의학회 2019 대한예방한의학회지 Vol.23 No.2
Objectives : The study was aimed to analyze the College Scholastic Ability Test (CSAT) test-takers' favor of entering Korean Medicine college and their perception toward the Korean Medicine. The study will present information that can be used for university administrator and in medical education field. Methods : A questionnaire was developed, comprising categories about the favor of entering Korean Medicine college, the experience and reason of receiving Korean Medicine healthcare treatment, and the perception toward the Korean Medicine. Face validity and content validity of the developed questionnaire were tested before survey. Then the questionnaires were distributed to 168 CSAT test-takers. Results : The most positive reason of entering Korean Medicine college is the characteristic of job, while the negative one is of the characteristic of the discipline. Respondents who answered as positive toward Korean Medicine are more than those who answered as negative. The most positive reason of receiving Korean Medicine healthcare treatment and perceiving Korean Medicine positively is because of its medical effectiveness. The most negative reason is responded as et cetera in both categories. Conclusions : The results of the survey may indicate that by promoting recent research progresses in Korean Medicine and benefits from choosing a career as medical professions, more CSAT test-takers will have positive attitude toward Korean Medicine college entrance. Also by promoting the medical effectiveness of Korean medicine to CSAT test-takers, more CSAT test-takers will receive or have positive attitude toward Korean Medicine healthcare service.
김현석 한국무역통상학회 2017 무역통상학회지 Vol.17 No.1
The focus of this investigation is to analyse the relationship between financial stress index and industrial production index with monthly data from 2000 to 2016. The results of the linear Engle-Granger 2-stage cointegration test show no common trend between the variables, but the results from nonlinear cointegration test reflecting the characteristics of the estimated residuals, including the trends, suggest that there is a long-run relationship. The results of this empirical analysis have two following implications. First, the cointegration test with 2-stage estimation procedure should reflect the characteristics of the residuals. Second, it is useful to provide an indicator of the financial situation of the individual economy. Specifically, the results of empirical analysis, including the nonlinearity, suggest that it is necessary to expand the appropriate analytical models to be used in indexing and forecasting of individual economic conditions.
ModBus 프로토콜을 이용한 SCADA 시스템의 보안성 검증을 위한 테스트 베드
김현석,박동규 순천향대학교 부설 산업기술연구소 2016 순천향 산업기술연구소논문집 Vol.22 No.1
The Modbus protocol is developed for communication between machines of the industrial control systems. Industrial control systems known as SCADA systems are widely used Modbus communication protocol. In this paper, we configure a small scale test bed in order to verify the security of SCADA systems using the ModBus protocol. And we perform attack experiments on the testbed in order to verify the effectiveness of it. Finally, we derive a couple of security issues in the SCADA system using the Modbus protocol.
한 · 미간 모바일 어플리케이션 선호도 분석 : 아이폰 어플리케이션 중심으로
김현석,은혜영,정광용,홍성민 한국디자인학회 2010 한국디자인학회 학술발표대회 논문집 Vol.2010 No.10
Since mobile applications use expended Wi-Fi environments and smart phones user population growth, the market is expanding rapidly. These mobile applications are supplied to the same standards around the world, but the applications preference is different for each user. Because user can choose applications based their own cultural and technical backgrounds on. Download a large number of applications is assumed to have high affinity. The collection of ranking data from Apple App store analyze this data compare by each country. Accordingly, applications preference is appear differently depending on the each country. The cause of the difference in affinity that results in a measure of the nation's cultural differences and differences in levels of technology adoption, and it can be seen through the analysis.