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진승보(Seung-bo Jin),정의승(Eui-Seung Chung) 한국항공우주연구원 2010 항공우주기술 Vol.9 No.1
KSLV-Ⅰ 발사체의 성공적인 발사를 위해서 필요한 발사장(GC, Ground Complex)은 조립장(AC, Assembly Complex)과 발사대(LC, Launch Complex)로 구분되며, 현재 고흥 외나로도 우주센터에 위치하고 있다. 그중 조립장은 KSLV-Ⅰ 발사체 1단과 상단부의 입고, 총조립, 각종 성능시험, 발사 전 시험 및 준비 점검 등이 이루어지며, 이러한 기술적인 운영을 효율적으로 수행하기 위해 필요한 장비들이 조립장 종합조립동에 설치되어 있다. 이들 운용 장비들은 발사체의 여러 기계장치 그리고 전기, 전자장치와 다각적이고 다양한 형태의 인터페이스를 가지게 되며 발사체의 발사 전 준비점검과정에 있어 최적의 조건과 성능 보장을 제공하여야 한다. 본 논문에서는 이러한 운용장비 중에서 발사체의 이동, 조립 및 분해 작업과 시험등을 지원하기 위한 기계지원장비에 대한 개발 요구조건 및 제작 성능시험을 소개하고 있다. Ground complex composed of Assembly Complex(AC) and Launch Complex(LC) which is located on Oenarodo space center in Kohung is necessary for successful launching of KSLV-Ⅰ. AC performs accepting of a KSLV-Ⅰ 1st stage and 2nd stage, stage assembly, the integrated launch vehicle, the checked out, and all kinds of performance test, pre-launch tests and processing. At AC, the mechanical support equipments, that is called the technological equipments, are installed in the Launch Vehicle Assembly Test Building(LV ATB). These technological equipments have diverse forms of an interface with mechanical/electric device of the launch vehicle and have to provide a condition and the performance guarantee of an optimum in the launching operation process. In this paper, the requirements specification and manufacturing performance test for the mechanical support equipments which are used in the assembly/disassembly and test of the launch vehicle are introduced.
시스템엔지니어링 강화를 위한 임무보증 Framework 연구
김광해,조철훈,고정환,정의승,Kim, Kwang Hae,Cho, Chul hoon,Ko, Jeong Hwan,Chung, Eui Seung 한국시스템엔지니어링학회 2014 시스템엔지니어링학술지 Vol.10 No.2
In recent years, the United States have been several major failures of launch. As a result of these failures, activity of mission assurance valued. Mission assurance is defined as the application of systems engineering process towards the goal of achieving mission success. Therefore, mission assurance perform independent technical assessments throughout the concept and requirements definition, design, development, production, test, deployment, and operations phases. Space system program was emphasized the importance of the system engineering for that required huge cost and long term development. For this reason, independent review and verification of mission assurance is essential. Mission assurance gives us confidence to proceed with launch and best opportunity for mission success. In this study, framework of mission assurance is proposed by foreign case analysis.
이영호(Young-Ho Lee),정의승(Eui-Seung Chung),박정주(Jeong-Joo Park),조광래(Gwang-Rae Cho) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In this Paper, design requirements of Ground Complex for the Korea Space Launch Vehicle-Ⅰ which will play so important roles of successful execution for Korea National Space Development Program are presented. KSLS through the international cooperative design is under development. Ground Complex has to supply safety space, construction and equipments for assembling, check-out and launching of the space launch vehicle, consists of Mechanical, Electrical, Fuel Ground Support Equipment and Infrastructure.
이휘우(Hwi Woo Lee),정은영(Eun Young Chung),박관용(Kwan Yong Park),임영재(Young Jae Im),정의승(Eui Seung Jung) 대한인간공학회 2021 大韓人間工學會誌 Vol.40 No.6
Objective: The goal of this research is to study the driver"s acceptable level of vibration intensity and duration as haptic feedback during conditional automated driving. Background: Gradually, the driving of a vehicle is being automated, which frees the driver from driving. As various activities become possible as non-driving related activities (NDRAs) in the vehicle, driver"s attention level gets lowered and accordingly, visual, auditory, and tactile-based feedback must be properly provided. Unlike visual and auditory information, which can interfere with driver"s concentration and confuse situational awareness due to information from many systems, tactile feedback is presented as an important feedback method in a way that can improve the efficiency of information delivery about safety. However, although there are various situations in which the driver is informed of the change of control right in the NDRT (Non-Driving Related Task) situation, there is still a lack of research about the intensity and duration as haptic feedback. Method: By establishing an experimental environment similar to that of a vehicle, the vibration actuators were placed on the seat in a 2 × 2 arrangement on the seat pan and seat back. The vibration was implemented using Arduino equipment and PWM control. The experiment was conducted by combining the independent variables, the intensity of vibration (1~5V), and the level of stimulation time(1.5s, 2.5s, 3.5s, 4.5s). Dependent variables, Error rate and Preference were selected, and Preference for the seat vibration stimulus position (1. Seat back & pan, 2. Seat back, 3. Seat pan) was investigated. Preferences were all collected on a 7-point likert scale. Results: Through ANOVA analysis, there were significant differences in the intensity of vibration, stimulation time, and the interaction between the two variables, and there was no significant difference in gender or age. Subjects were able to identify vibrations from 3V, and in the case of stimulation time of 3.5s was the most preferred at 3V and 4V, which recognize most vibrations, and 1.5s and 4.5s had lower preferences. At 5V, 2.5s was the most preferred, and from 3.5s the preference decreased sharply. In the case of the vibration stimulation position of the seat, the seat back had the highest preference, and in the case of the seat pan, the preference was very lower than that of the seat back and seat back & pan. Conclusion: In this study, the minimum level for recognizing the vibration stimulation of the haptic feedback in the vehicle seat and the optimal stimulation time according to the vibration intensity was investigated through experiments, and the range that could accommodate the haptic feedback was derived. Application: Based on the results of the vibration stimulation level and stimulation time level for the haptic feedback of the vehicle seat in this study, it can be used as a reference index when designing the haptic feedback of the vehicle in the future.
KSLV-I 운용에서의 추진제 및 고압가스 품질관리 활동 결과
정영석(Youngsuk Jung),강선일(Sunil Kang),오승협(Seung-Hyub Oh),정의승(Eui-Seung Chung) 한국항공우주연구원 2011 항공우주기술 Vol.10 No.2
본 논문은 2008년 8월초부터 2010년 6월 10일 KSLV-I 2차 발사까지 수행된 나로우주센터의 추진제 및 고압가스 품질 관리 결과를 정리한 것이다. 품질관리는 나로우주센터에서 사용되는 모든 고압가스(Air, GHe, GN₂) 및 액화가스(LOX, LN₂)를 대상으로 관련 발사대 및 조립동 모든 장비에 대해 자율시험(AT), 인증시험(QT), 비행시험(FT) 모든 단계에서 수행하였다. 결과로써 총 428회의 간이검사(check analysis), 111회의 전항목검사(full analysis)를 수행하였다. This paper is about the results in Qualification Management activity performed between the Autonomous Test(AT) season(August. 2008) of Launch Complex and the 2nd flight test season(June. 10, 2010) of KSLV-I. All cryogenic fluids(LOX, LN₂) and compressed gases(Air, GN₂, GHe) were qualified by qualification management activity during AT(Autonmous Test), QT(Qualification Test) season for LP(Launch Pad) and LVAB(Launch Vehicle Assembly Building) and FT(Flight Test) season of KLSV-I. As the results, total 428 times of check analysis and 111 times of full analysis were performed.