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모듈형 복합재 전두부가 적용된 알루미늄 차체의 구조해석 연구
구정서(Jeong-Seo Koo),조현직(Hyun-Jik Cho),한형석(Hyung-Seok Han) 한국철도학회 2003 철도저널 Vol.6 No.4
In this study, an aluminum bodyshell with a modular front end made of composite materials is numerically evaluated applying the standard specifications for the urban EMU (Electric Multiple Unit)train. Structural analyses under compressive load, torsional load and free vibration satisfy the standard specifications, but analysis under normal load doesn't. By the way, the aluminum bodyshell of the car except the modular front end is almost same to that of the Korean standard EMU, which satisfy the standard specifications. It is presumed that the stiffness of the modular front end made of composite materials has some influence on the strength of the aluminum bodyshell.
47,XYY,inv(9) (p11;q13)으로 산전진단된 태아의 정상분만 1례
구정서 ( Jeong Seo Koo ),주현철 ( Hyun Chul Joo ),이도근 ( Do Keun Lee ),전지혜 ( Ji Hye Jeon ),이재민 ( Jae Min Lee ) 대한주산의학회 2002 大韓周産醫學會雜誌 Vol.13 No.2
35세 경임부가 임신 16주 2일에 산전진단의 선별검사로 삼중검사를 받았다. 모체혈청 알파태아단백과 융모성 성선자극호르몬은 상승되었고, 반면 비포합형 에스트리올은 저하되었다. 그래서 양수 염색체검사를 실시한 결과 47,XYY,inv(9) (p11;q13)의 핵형을 보였다. 47,XYY 남성은 양수천자 1000명당 1명 정도 발견된다. 이 증후군의 대다수는 정상의 표현형을 보이며 대체로 키가 크고 약간의 정신발육지체를 보인다. 9번 염색체 p11에서 q13에 이르는 중심 주위의 역위는 본인은 정상적인 표현형을 보이나 염색체 이상의 자녀를 갖게 될 가능성이 많다. 저자들은 부모와 유전상담하였으나 분만하기를 원하여 외형상으로 정상의 표현형을 보이는 태아를 만삭 질식분만 하였기에 간단한 문헌고찰과 함께 보고하는 바이다. A 35-year-old multigravida woman received triple marker screening tests in 16weeks 2days of gestation. MSAFP and MShCG values were increased, whereas MSuE3 value was decreased. So we performed amniocentesis for karyotyping and confirmed male fetus with 47,XYY,inv(9) (p11;q13). A neonatal survey showed the incidence of XYY male to be approximately 1:1000, the majority of cases are phenotypically normal. XYY males are taller than normal and show delayed mental development. A pericenteric inversion of chromosome 9 that extends from p11 to q13 is considered a normal chromosome variant, but the carrier is at high risk to produce abnormal offspring. As she did not want to terminate her pregnancy, she delivered vaginally in 39weeks 6days of gestation. As a result of physical examination, the neonate showed a normal phenotype. We report it with brief review.
동력분산형 고속전철의 충돌안전도 해석 및 평가기술 연구
구정서(Koo Jeong-Seo),김거영(Kim Geo-Young),조현직(Cho Hyun-Jik) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
In this study, the crashworthy design guidelines for the high speed EMU were derived and numerically evaluated. As for this high speed train, there are several different features from the KTX in that the conventional type bogies are adopted and the front end car (TC car) accommodates passengers. It is natural that the impact acceleration of the front end car should be controlled under the appropriate level stipulated at safety regulations for collision accidents. Also, car-to-car interfacing structures and devices should be deliberately designed to prevent overriding and telescoping mechanisms. As the first step for these design countermeasures, it was studied that how much impact energy should be absorbed at the energy absorbing zones and devices of each carbody to satisfy the impact acceleration regulations of the safety regulations. These results will be used as the crashworthy design guidelines for the high speed train in the next year research.
쉘형 차체 구조의 소재대체 개념설계에 대한 경량화 예측 기법
구정서(Jeong-Seo Koo),조현직(Hyun-Jik Cho) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper is studied a theoretical approach to predict structural performances and weight reduction rates of a car-body with shell type sections in case that its materials have to be substituted. For the material substitution design of a car-body, bending, axial and twisting deformations are considered under constant stiffness and strength conditions, which utilize some new indices derived from a structural performance point of view. The developed indices to measure the weight reduction by the material substitution give good guidelines on conceptual design of car-bodies.
구정서 ( Jeong Seo Koo ),주현철 ( Hyun Chul Joo ),이도근 ( Do Keun Lee ),전지혜 ( Ji Hye Jeon ),이재민 ( Jae Min Lee ),이일선 ( Il Seon Lee ) 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.12
Cystic lymphangioma of the broad ligament is very rare benign cystic lesion. They rarely present in adult life. We present the case of a 37-year-old female with a history of chronic recurrent left lower abdominal dull pain over a period of several months.
구정서(Koo Jeong-Seo),조현직(Cho Hyun-Jik),이현순(Lee Hyun-Soon) 한국철도학회 2001 한국철도학회 학술발표대회논문집 Vol.- No.-
In the standard specifications for the urban EMU(Electric Multiple Unit) train, there are several items to ensure safety against accidents. The 21th -23th items have much relation with the crashworthiness of the urban EMU train. In this study, the rubber tired AGT(Automated Guide-way Transit System) under development by KRRI is numerically evaluated in a crashworthy point of view by applying the above crashworthiness items. The numerical results show the detail design of the AGT satisfies the 22th and 23th items. But the design is recommended to adopt mechanical fuses to reduce the impact accelerations with respect to the 21th item.
유한요소해석을 이용한 철도차량 시트프레임의 정적 강도 평가에 관한 연구
구정서(Koo Jeong seo),조현직(Cho Hyun Jik) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper, the structural strengths of a rolling stock seat were numerically evaluated under several design load conditions based on the UIC requirements. The rolling stock seat was designed for the high speed train of a Chinese conventional line. To maximize its weight reduction and structural strength, some aluminium alloys like 6NO1-T5 and ALDC8-T5 were applied to the base frame, side frame and armrest. The designed seat frame satisfied the strength requirements on inertia loads due to accelerations, and fatigue test conditions. However, it violated the requirements on the static test of UIC 566 OR. Some design modifications were suggested and numerically evaluated to satisfy the static test requirements.
구정서(Koo Jeong-Seo),조현직(Cho Hyun-Jik),이승일(Lee Sung-Il),권태수(Kwon Tae-Soo) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
As Rolling stocks, which are composed of heavy units, run along predefined tracks at relatively high speeds, it is impossible to stop shortly without accidents using emergency braking in case a person stay on the track. Therefore train-to-human collision accidents over 200 cases occurs every year and the tolls suffer very serious damage. To consider some countermeasures to reduce injury at train-to-human collision accidents, the concerning statical data were analysed to investigate human injury severity for accident patterns and collision speeds. Based on these statistical data analyses, some standard scenarios for train-to-human collision accidents were derived to cover about 75% of the fatal accidents.
구정서(Koo Jeong-Seo),송달호(Song Dahl-Ho) 한국철도학회 1998 철도저널 Vol.1 No.1
Described in this paper is the result of a study on collision analysis of TGV-K using 1-dimensional model for crashworthy design. Crashworthy design of the front end is very important because majority of the impact energy(more than 70%) is absorbed by the crush of the front end when the train is collided with an obstacle like a tank lorry. Guideline for the crashworthy design can be described from the collision analysis of the whole train using a 1-dimensional model. Since the headstock of TGV-K is not designed in a crashworthy point of view, a conceptual design of the headstock to improve crashworthiness is suggested and evaluated using 1-dimensional collision analysis. The suggested design, which adopts an energy absorber and a crashworthy headstock, shows a good behaviour on the accident scenario of SNCF(collision at 110 km/h against a movable rigid mass of 15 ton).