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김연수,신무학,송윤희,정희선,Kim, Youn-Su,Shin, Moo-Hak,Song, Yun-Hee,Chung, Hee-Sun 대한치과기공학회 2002 대한치과기공학회지 Vol.23 No.2
This Study aims at investigating the tendency of individual problems that the students at the departments of dental technology are faced with, their efforts and types of activities to solve the problems. Surveyed for this purpose were 700 freshmen to juniors enrolled in the departments of dental technology at the universities across the country and they were analyzed by area, grade and sex. 1. Tendency of Problems The areas of problems the students at the departments of dental technology considered as most serious were health, human relation, view of value and economy in sequence, while the areas they considered as least serious were future course and employment. In general, there were tendencies as follows: divided by grade, the higher the grades of the students are, the higher scores of problems they get(F=12.14, P=.000) : in the areas of health and human relation, as the grade gets higher, the scores of their problems also increase, accordingly(F= 17.58, P=.000)(F=8.39, P=.000) : in the areas of economy, parents and home, freshmen and juniors are found to have higher scores of problems compared to sophomores,:F=7.89, P=.000)(F=11.63, P=.000) : divided by sex, female students recorded higher scores of problems than their counterparts(F=31.85, P=.000) 2. Efforts for Problems View of value, human relation, parents and home appeared to be the areas for which the students made the highest rate of efforts in sequence while the areas for which they paid lowest grade of efforts were health and economy. In other words, the students gave higher scores for human relation and view of value in terms of tendency as well as efforts of problems, while they rated high for health and economy in the tendency but low in the efforts of problems. Divided by grade, freshmen and juniors appeared to score higher points than sophomores in their efforts to solve problems, even though juniors made relatively higher efforts than freshmen(F=6.53, P=.002). Divided by sex, female students scored higher points in their efforts than males(F=15.98, P=.000) 3. Difference of Efforts to Solve Problems. In the analysis into the scores of difference showing the disagreement between the tendency of problems and the efforts to solve problems, the area of health was rated as highest, followed by economy. There was little difference of scores between human relation and view of value, an indicator of agreement between the scores of problems and efforts. The difference of scores between future course and employment, between liberal arts and recreation, between characters/parents and home/school work turned out to be negative in the listed sequence, leading to a conclusion that the students enrolled in the departments of dental technology are making more efforts to solve problems than actually needed in most areas. By grade, there was a significant difference only in the area of health(F=3.00, P=.050). This difference itself was widening as the students come to higher grades. By sex, females showed bigger difference than males. 4. Types of Activities to Solve Problems. The analysis into types of activities to solve problems revealed that the surveyed students seemed to actively cope with the problems in all areas, relying at the same time on personal relationship. Especially in the areas of health, economy, parents, home, human relation, future course and employment, the students appeared to deal with the problems actively as well as emotionally.
객체 지향 접근을 통한 LDAP 상호운용성 시험도구 구현
김연수,이숭희,이종협,Kim Youn-su,Lee Soong-Hee,Lee Jong Hyup 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.5B
The testing tools implemented up to now for the LDAP(Light-weight Directory Access Protocol) interoperability tests are not easy to modify or add new test items since their source codes are not open. The object-oriented approach, therefore, is required to implement such a testing tool which can be easily modified or add new test items. Thus we designed the architecture for the testing tool applying the object-oriented approach. Java language, appropriate for the object-oriented approach, was used to implement the testing tool. The newly implemented testing tool can modify partly to adapt to the already stored data in the test suite information even during tests. Five LDAP servers can be tested simultaneously with the same configuration setup. Actual testing for the two LDAP servers validates the usefulness of the designed architecture with the proper working of the implemented testing tool according to the architecture. 현재 국외의 LDAP (Light-weight Directory Access Protocol) 상호운용성 시험을 위한 시험 도구가 있으나 이들은 소스가 개방 되어 있지 않아 시험 환경에 맞추기 위한 시험 항목의 수정이 어렵고, 차후 새로운 시험 항목의 추가 또한 힘든 상황이다. 그러므로 새로운 시험 도구에서는 개발 시간 단축과 시험 항목의 추가 및 변경의 용이성을 위해 객체지향 접근이 요구된다. 따라서 객체 지향 접근을 위해 객체 지향 언어인 자바를 이용해 시험도구를 구현하였다. 구현한 시험도구는 시험 항목 정보 중에서 이미 저장되어 있는 데이터에 알맞게 일부를 수정하여 시험이 가능하다. 또한 한번의 동일한 설정으로 최대 5개의 LDAP 서버를 동시에 시험 가능하다. 구현한 시험도구를 사용하여 두 대의 LDAP 서버를 대상으로 상호운용성 시험을 수행한 결과 정상적으로 동작됨을 확인하였으며, 시험 환경에 알맞도록 시험항목의 변경과 새로운 시험 항목의 추가가 용이함을 확인하여, 설계한 아키텍처의 유용성을 검증하였다.
김연수(Yeon-Su Kim),박성혁(Sung-Hyuk Park),이우동(Woo-Dong Lee),정종덕(Jong-Duk Chung),한석윤(Seok-Youn Han) 한국철도학회 1999 한국철도학회 학술발표대회논문집 Vol.- No.-
Because many light rail transit systems are mainly operated in the downtown areas of a large cities and the congestion areas, there are many steep gradients and sharp radius sections in that lines. As that reasons above, light rail vehicles are equipped with differential gear units between traction motors and final reduction gear units. In this paper, the configurations and the interferences of 2K-H I type planetary gear train, which is applicable for light rail vehicles and based on various differential gear units, are studied. The ranges of addendum modification coefficients which would not lead to interferences is analyzed, and optimal addendum modification coefficients among these ranges are presented, which generate the maximum efficiency of planetary gear drives and differential gear unit as pressure angles, speed ratios.
한석윤(Han Seok-Youn),정종덕(Chung Jong-Duk),김연수(Kim Yeon-Su),이호용(Lee Ho-Yong),박성혁(Park Sung-Hyuk),최출헌(Choi Chool-Hoen) 한국철도학회 2000 한국철도학회 학술발표대회논문집 Vol.- No.-
The carbody of the Korean Rubber Tired AGT is small size and light weight comparing to existing electric railcars. For this reasons, car shape and arrangement of major equipmemts are limited. AGT is newly adopted mass trnsportation system in Korea. Therfore, it should be desined to appeal to passengers and create new passenger demand. To achieve this goal, the design concept of carbody is to be new design to coincide with passengers emotions. In this regard, we tried to meet this trends through manufacturing of scaled models and being evaluated by potential opeation organization.
목재균(Mok Jai-Kyun),김연수(Kim Youn-Su),이우동(Lee Woo-Dong),허남건(Hur Nahm-Keon) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper is described for the flame behaviors in light railway cabin by numerical simulation code, which can be interpreted the design parameters in terms of suppression the fire propagation and excavation the passengers safely. The results shows that the flame intensity(fire temperature, smoke density) depends on the firing points in cabin and propagates rapidly whole cabin space rather than modem subway cabin due to smaller inner space. The data will be used to how can be get the safety case, which is described on the operating principles for all facilities and logistics against to the light railway firing accidents.