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정용갑,한영민 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.11
액체 추진제 추진기관은 가압제로 산화제와 연료인 추진제를 가압하여 로켓 엔진으로 공급하여 추진제를 연소시켜 추진력을 얻게 된다. 본 추력 7톤급 로켓 엔진은 한국형 발사체의 3단 엔진으로 사용되며 주요 구성은 연소기와 터보펌프, 엔진공급시스템 등으로 구성되어 있다. 설계 및 제작된 엔진의 성능 검증은 상단 로켓 엔진 연소시험설비(UETF)에서 수행된다. 상단 엔진 연소시험설비는 발사체의 3단 로켓엔진을 개발하기 위한 시험 설비로 산화제로는 액체산소(Liquid Oxygen)를 사용하고 연료로는 케로신(Kerosene)을 사용한다. 상단 엔진 연소시험설비에 대한 상세설계가 수행되었고 나로우주센터에 본 설비를 구축 중에 있다. 본 논문에서는 고압가스 공급시스템에 대한 설계 결과를 소개하고자 한다. The propulsion system of liquid propellants pressures the propellant using the pressurant and generates thrust by supplying oxidizer and fuel to the rocket engine. This thrust about 7ton rocket engine is used in the third stage engine, which is mainly composed of combustion chamber, turbo-pump and engine supply system. For performance validation of the upper-stage liquid rocket engine, the designed and manufactured engine should be tested in upper-stage rocket engine test facility(UETF). The UETF is the test facility to develop the third stage rocket engine of launch vehicle, which uses liquid oxygen as a oxidizer and kerosene as a fuel. The UETF detailed design was conducted and it is being built in Naro Space Center. In this paper the design results of compressed gas supply system is introduced.
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액체로켓추진시스템의 가압제 탱크에서 가압제 토출시 온도강하율에 대한 연구 (Ⅱ)
정용갑(Yong-Gahp Chung),김용욱(Yong-Wook Kim),김유(Yoo Kim) 한국항공우주학회 2008 韓國航空宇宙學會誌 Vol.36 No.3
액체로켓추진시스템에서 추진제 가압시스템은 추진제가 저장되어 있는 탱크의 얼리지 공간에 가압제인 가스를 제어된 압력으로 공급하는 것이다. 이러한 추진제 가압시스템의 가장 중요한 설계변수는 극저온 추진제 탱크 내에 설치된 가압제 탱크에서 토출되는 가압제의 온도이며, 기체 상태인 가압제의 밀도는 토출되는 가압제의 온도에 따라 민감하게 변한다. 이 전 연구에서는 상온 가압제와 상온 외부유체 간의 온도 상관성에 대한 연구가 수행되었으며, 본 연구에서는 현재 개발 중인 액체로켓추진 발사체의 가압시스템과 통일한 조건인 극저온 가압제(GHe)와 극저온 외부유체(LOX)를 적용하여 가압제 탱크에서 가압제 토출 시 강하되는 온도 변화를 실험 및 해석을 통하여 고찰하였다. Propellant pressurization system in liquid rocket propulsion system plays a role in supplying pressurant gas at a controlled pressure into the ullage space of propellant tanks. The most important design parameter for such propellant pressurization system i the temperature of pressurant gas fed from pressurant tank, which is placed inside 0 cryogenic propellant tank. Such pressurant is gaseous state, of which density is vet; sensitive to the temperature of pressurant. Previous investigation dealt with thermal correlation of pressurant and external fluid at room temperature. This study investigate the temperature variation of cryogenic pressurant (GHe) at the time when the pressurant is coming out of pressurant tank, which is submerged in a liquid oxygen, experimentally as well as numerically.
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정용갑(Yong-Gahp Chung),한상엽(Sang-Yeop Han),조남경(Nam-Kyung Cho),권오성(Oh-Sung Kwon) 한국항공우주연구원 2006 항공우주기술 Vol.5 No.1
액체로켓 추진시스템에서 가압시스템은 발사체 추진제 탱크의 얼리지 공간에 제어된 가스를 공급하는 것이다. 가압시스템에서 고온 가스 열교환기를 적용하는 데는 가압제의 비체적을 증가시켜 전체 발사체 시스템의 중량을 감소시키는 장점이 있다. 가압시스템 성능에 있어서 주목할 만한 개선점은 극저온 시스템에서 얻어질 수 있다. 이러한 경우 가스 공급은 극저온 탱크 내부에 저장되어 진다. 본 연구에서는 극저온 유체로 액체 산소를 사용하였다. 극저온 가압제의 온도 특성은 가압시스템에서 구성품을 개발하는데 있어서 매우 중요하다. In this study, the pressurization system in a liquid rocket propulsion system provides a controlled gas pressure in the ullage space of the vehicle propellant tanks. It is advantage to employ a hot gas heat exchanger in the pressurization system to increase the specific volume of the pressurant and thereby reduce over-all system weight. A significant improvement in pressurization-system performance can be achieved, particularly in a cryogenic system, where the gas supply is stored inside the cryogenic propellant tank. In this study liquid oxygen was used. The temperature characteristic of cryogenic pressurant is very important to develop some components in pressurization system.
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정용갑(Yonggahp Chung) 한국추진공학회 2019 한국추진공학회 학술대회논문집 Vol.2019 No.11
한국형발사체의 1단 추진기관시스템에서는 유체의 역류를 방지하거나 제한하여 한 방향으로만 유체가 흐르게 제어하기 위하여 체크밸브를 사용한다. 한국형발사체의 1단 추진기관시스템에서는 추진제인 산화제로는 액체 산소(LOX)가 사용되고 연료로는 케로신이 사용된다. 가압제용 헬륨 가스는 극저온 액체 산소 탱크 내에 설치된 가압제 용기에 저장되고 퍼지용 헬륨 가스는 상온으로 용기에 저장된다. 본 연구에서는 한국형발사체의 1단 추진기관시스템에 적용되는 체크밸브 개발에 대해 고찰하였다. The check valves are used to allow free flow in one direction and to prevent or restrict reverse flow in KSLV-II first stage propulsion system. Liquid oxygen(LOX) as the oxidizer and kerosene as the fuel are used for the propellant in KSLV-II first stage propulsion system. The helium gas for the pressurant is stored in pressurant cylinders inside the cryogenic liquid oxygen tank and the helium gas for the purge is stored in room-temperature cylinders. In this study, the development of check valve for KSLV-II first stage propulsion system was considered.
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리더십유형이 병원 조직구성원의 직무만족, 조직몰입 및 이직의도에 미치는 영향
정용갑 ( Jeong Yong Gab ),하호욱 ( Ha Ho Ug ),손태용 ( Son Tae Yong ) 한국병원경영학회 2003 병원경영학회지 Vol.8 No.2
It is important how the leader leads the organizational members with leadershp appropriate to environment changes as the leader has great influence on the management of hospital organization. These data were collected from the questionnaire surveyed, from February 14 through February 28, 2003, to 218 people among those in the field of doctorship, management administration, nursing, technology, medical engineering, management engineering, and general affairs, working for three hospitals under S medical foundation in Pusan. The principal findings of this research are as below : 1. Type of leadershp and job satisfaction had positive correlation in terms of both transformational and transactional leadershp, with former having more relation than the latter. 2. Type of leadership and organizational commitment had positive correlation in terms of intellectual stimulus and situational rewards, having little relation statistically. 3. Type of leadership and turnover intentions had negative correlation only in individual consideration, situational rewards, and exceptional management, showing that transactional leadership had more relation than transformational leadership. 4. In terms of leadership and its effect on the organizational performance and turnover intentions, transformational leadership had more correlation than transactional leadership. But transactional leadership also turned out to have effect on organizational performance. When transformational leadership used, turnover intentions were lower than when transactional leadership used. However, both transformational and transactional Ieadership had negative correlation to turnover intentions. 5. Effect that type of leadership according to job classification, status, age, and academic carer has on organizational performance and turnover intentions was differed by those factors; especially, in the occupation of doctor, both transformational and transactional leadership had positive correlation to turnover intentions. 6. Regression analysis on the factors of organizational performance and turnover intentions showed that higher age had positive correlation to the organizational performance in terms of socio-demographical features and that the more ieadershp was used for charismatic and situational rewards and the less leadership was used for intellectual stimuli, the higher organizational performance was likely. a decisive factor of organizational members attitude and motivation.a decisive factor of organizational members attitude and motivation.In short, hospital operators and managers should examine each manager s qualification, type, and style of leadership in the hospital organization, and they must develop lasting programs for effective education and training for developing characteristics of leadership are in needed to have managers with appropriate managerial mind to respective post and status. It should be kept in mind that manager s leadership especially has great effect on members goal-setting, goal-achievement, organizational performance, and turnover intentions as it is a decisive factor of organizational members attitude and motivation.
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