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양다솜(Da-som Yang),최창국(Chang-Kuk Choi),이홍표(Hong-Pyo Lee),류원형(WonHyoung Ryu) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Delivery of drug at a constant rate is long desired to maximize therapeutic efficacy for the treatment of diseases. However, most drug delivery systems suffer from initial burst or the lack of control of delivery rates. Thus, we propose micro-fluidic units as more precise and convenient way to achieve constant delivery or further more complex delivery profiles. In this study, it was demonstrated that the release rates of model drugs could be controlled by a simple change of micro-geometry of micro-fluidic units.
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정보보호 : 웹사이트 패스워드 인증 시스템의 보안성 분석
노희경 ( Hee Kyeong Noh ),최창국 ( Chang Kuk Choi ),박민수 ( Min Su Park ),김승주 ( Seung Joo Kim ) 한국정보처리학회 2014 정보처리학회논문지. 컴퓨터 및 통신시스템 Vol.3 No.12
포털사이트는 검색 엔진, 이메일 서비스뿐만 아니라 블로그, 뉴스, 쇼핑 등 다양한 서비스를 제공하고 있다. 국내 포털 업체인 네이버의 하루 평균 로그인 횟수가 3억 건에 달할 만큼 많은 사람들이 포털사이트를 이용하고 있음을 알 수 있다. 이와 같이 포털사이트가 제공하는 서비스의 종류가 다양해지고 더불어 이용자 수가 증가함에 따라 포털사이트를 대상으로 하는 공격도 증가하고 있다. 기존 패스워드 인증 시스템은 주로로그인 단계에서의 보안 위협에 초점을 두고 이를 해결하기 위한 대안에 대한 연구를 진행한 반면, 본 연구에서는 패스워드 인증 시스템의 전체 절차인 회원가입, 로그인, 패스워드 재발급 1단계, 패스워드 재발급 2단계의 모든 단계에 대한 보안 위협 및 보안 요구사항에 대해 분석하였다. 또한 기존 공통평가기준의 공격 성공 가능성이 로그인 단계에만 국한되었던 것을 확대시켜 패스워드 인증의 모든 단계에 대한 공격 성공가능성을 측정하였으며, 국내외 포털사이트 패스워드 인증 시스템의 보안성을 정량화된 수치로 비교 분석하였다. Portal site is not only providing search engine and e-mail service but also various services including blog, news, shopping, and others. The fact that average number of daily login for Korean portal site Naver is reaching 300 million suggests that many people are using portal sites. With the increase in number of users followed by the diversity in types of services provided by portal sites, the attack is also increasing. Most of studies of password authentication is focused on threat and countermeasures, however, in this study, we analyse the security threats and security requirement of membership, login, password reset first phase, password reset second phase. Also, we measure security score with common criteria of attack potential. As a result, we compare password authentication system of domestic and abroad portal sites.
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柳根碩,玄友泳,曺泳八,崔昌國 漢陽大學校 1973 論文集 Vol.7 No.-
Plyers in Sports may deccide their action according to any signal, the motion of opponents and the direction of a moving ball. This will have close relation with reaction time and shortening of reaction time plays an important role in winning a game. Consequently, we should know the various reaction time by analyzing the data, measuring reaction speed the center of gravity movement in various readiness position. tone and light stimulus, and various reaction method. The 33 male ball players, 30 female ball players, 42 female non-players, 35 male non-players, from colleges in the City of Seoul were taken as subjects. A reaction board with a electric automatic switch. T.K.K. made "Digital Timer" Chrono -scope and pistol or light bulb were used as a signal stimulus for this study. They stand on the board in knee bent position or Fundamental standing position, and in desingnated jump quickly to signal of pistol or light bulb. The results were as follows; 1. In reaction tine through 12 different methods of reaction. 1) College male players fastest. 2) Then the college female players comes in second. 3) Third. college male non-players. 4) Latest were the college female nolle-players. 2. In reaction speed between kneebent position and fundamental standing position. knee bent position is on an average 0.029/sec, faster than fundamental standing position in tendency. 3. In reaction speed between tone and light stimulus. The tone is on an averave 0.007/sec, faster than light stimulus in tendency. 4. In reaction speed between methods of reaction. 1) Straddle jump is fastest, vertical jump second, side jump is slowest within various readiness position and stimulus. 5. In reaction speed between male and female. Male is on an average 0.044/sec, fater than female in tendency. In conclusion, it can be summarized that the speed of reaction may be reduced into shortening of time by training.
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오른손잡이와 왼손잡이의 反應時間 比較 : 單純反應과 全身反應을 中心으로. lay stress on simple and whole body reaction
崔昌國 漢陽大學校 體育科學硏究所 1986 體育科學 Vol.6 No.6
In order to investigate which handed person is more faster in reaction time between right-handed person and left-handed. One on unexpectedly granted stimulation when they are in daily life or performs athletic sports, simple reaction and whole body reaction was measured on 30m ale highschool students in seoul, and results of study are as follows; 1. Showing the simple reaction of Light and Sound on right hand of right-handed person and left hand of left handed person. 1) In light reaction case, right hand of the right handed person was appeared faster 0.032/sec than left hand of the left-handed person in DM. Therefore, this showed the reduction rate of 13%. 2) In sound reaction case, right hand of the right-handed person was appeared faster 0.002/sec than left hand of left-handed person in DM. Therefore, this showed the reduction rate of 1%. 2. Showing the simple reaction of Light and Sound on left hand of the right-handed person and right hand of the left handed person. 1) In light reaction care, right hand of the left-handed person was appeared faster 0.020/sec than left hand of the right-handed person in DM. Therefore, this showed the reduction rate of 8%. 2) In Sound reaction case, right hand of the left-handed person was appeared faster 0.004/sec than left hand of the right-handed person in DM. Therefore, this showed the reduction rate of 2%. 3. Showing the whole body reaction of Light and Sound of the right-handed person and left-handed person. 1) In light reaction Case, right-handed person was appeared faster 0.0l6/sec than left-handed person in DM. Therefore, this showed the reduction rate of 3%. 2) In sound reaction Case, right-handed person was appeared faster 0.018/sec than left-handed person in DM. Therefore, this showed the reduction rate of 5%
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김성수,최창국 漢陽大學校 體育科學硏究所 1994 體育科學 Vol.14 No.14
The purpose of this study was to offer the basic information to develop multiple anxiety test (cognitive, physiological, behavior) for Judo player, The Subjects were 107 male judo players who had been participated into The spring season univer- sity judo match. Raw data were analysed from 100 subjects. The qustionnaire to test was CASI -2 by Martens(1990). The statistical analysis used frequency and X^(2). The following conclusion were made : 1) The cognitive anxiety of judo player were showed the highest on match re- sult, were shewed the most denial response on attention. 2) The physical anxiety of judo player were showed the highest on digestive organs. Judo player were showed slight response of anxiety on physiological change. 3) The self- confidence anxiety of judo player were more significantly changed by psychological values than physical values. AS a conclusion, this study can be auggested that sport pscychologist have to develop detailed state anxiety test questionnaire invovling match result, digestive problem, and confidence considerated match importance.
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