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서양우,윤정환,이승상,엄천섭,Seo, Yang Woo,Yoon, Jung Hwan,Lee, Seung Sang,Um, Chun Sup 한국시스템엔지니어링학회 2020 시스템엔지니어링학술지 Vol.16 No.2
In this paper we proposed the test design method of reliability growth management. First, we presented the process for establishing the reliability growth management test design considering the number of failures and the termination test time. Reliability growth analysis of continuous system was performed in accordance with the test design process presented. In case the reliability test result is not met with the reliability target value after more than three failures occurred, the required test times were analyzed that 1,725 hrs for one corrective action, 1,950 hrs for two corrective actions. If the number of failures is less than three, design a reliability demonstration test according to confidence level 80% and 90% was performed using RGA 11 Software. As a result, it is possible to establish the reliability growth management test design with sufficient use of available resources. The results of this study can be used when establishing a test design for assessment of reliability growth management of all continuous systems.
서양우,윤정환,김희욱,김정태,Seo, Yang Woo,Yoon, Jung Hwan,Kim, Hee Wook,Kim, Jung Tae 한국시스템엔지니어링학회 2020 시스템엔지니어링학술지 Vol.16 No.1
Currently, Storage Reliability is analyzed when predicting the reliability of guided missile. However, Mission Reliability and Logistics Reliability should be analyzed according to the definition of reliability in MIL-STD-785B. Therefore, it is necessary to accurately predict the reliability of guided missile based on the definition of reliability. In this paper, we proposed improved the reliability procedure and model for guided missile based on which the definition of reliability considering the mission profile. The proposed model can calculate the final failure rate by applying the ratio of the dormant and storage according to the mission profile. The proposed model has been confirmed to be more accurate than the existing model compared to the actual failure rate value. The results of this study can be useful for applying the reliability prediction to any guided missile.
서양우,임재훈,윤정환,남현우,우연정,Seo, Yang Woo,Lim, Jae Hoon,Yoon, Jung Hwan,Nam, Hyun Woo,Woo, Yeon Jeong 한국시스템엔지니어링학회 2021 시스템엔지니어링학술지 Vol.17 No.1
In this paper we proposed the alternative analysis of reliability design using redundancy technique. First, we presented the process for establishing the reliability design alternative analysis process considering the active redundancy and the standby redundancy. and then, the case analysis of A driving equipment was performed in accordance with the reliability design alternative analysis process presented. In case the series reliability design result is not met with the reliability target value. so, the target item for redundancy design of A driving equipment were selected as items with a severity of two or higher. The redundancy design applied with active and standby redundancy techniques were analyzed using BlockSim software. As a result, it was analyzed that reliability design to active redundancy with one of two elements required for A driving equipment is the most efficient compared to the target value of reliability. The results of this study can be usefully used before the reliability design is performed.
서양우,전동주,김소정,김용근,Seo, Yang Woo,Jeon, Dong Ju,Kim, So Jung,Kim, Yong Geun 한국시스템엔지니어링학회 2020 시스템엔지니어링학술지 Vol.16 No.1
In this paper we proposed to develop the reliability growth planning for the One-shot system using the PM2-Discrete model. The PM2-Discrete is the methodology specifically developed for discrete systems and is the first quantitative method available for formulating detailed plans in the discrete usage domain. First, the parameters RG, RI, T, MS and d of the PM2-Discrete model are set. Second, the case analysis was performed on One-shot system A. Third, the input parameter values were applied to drive the R(t) equation. Finally, using RGA 11 Software, the reliability Growth Planning Curve of One-shot system A was constructed. Also, the sensitivity analyses are performed for the changes of model parameters. The results of this study can be usefully used in establishing the reliability growth planning curve of the One-shot system.
무기체계의 안전 설계를 위한 DFMEA 적용에 관한 연구
서양우,오영일,김희욱,김소정,Seo, Yang Woo,Oh, Young Il,Kim, Hee Wook,Kim, So Jung 한국시스템엔지니어링학회 2022 시스템엔지니어링학술지 Vol.18 No.1
In this paper, we proposed the DFMEA Implementation Method for safety design of Weapon System. First, we presented the process for DFMEA. And then, the case analysis of OOO missile was performed in accordance with the process presented. After defining the system requirements of OOO missile, failure definition scoring criteria was set. In order to clarify the definition of failure, the failure was classified into safety, reliability, maintainability and others. After performing the function analysis, the relationship matrix analysis was performed to identify the failure mode according to the function without omission. After clarifying the failure classification, mode of failure, cause of failure and effect were analyzed to calculate the severity, occurrence and detection values. After the action priority was judged, the recommended action according to the failure classification was identified for the determined action priority. The results of this study can be used as a relevant basis for the design reflection and resource re-allocation of stakeholders.
서양우(Yang-Woo Seo),남현우(Hyun-Woo Nam),이승상(Seung-Sang Lee),김소정(So-Jung Kim) 한국해군과학기술학회 2023 Journal of the KNST Vol.6 No.2
We were presented an example of designing a system architecture based on systems engineering. A behavior diagram for high tech submarine was created according to the requirements. And then, a functional, physical architecture matrix was designed to convert the requirements into a functional/physical architecture. In addition, usecase diagram and sequence diagram which are methods of expressing requirements were utilized. These repetitive and systematic analysis results were applied to design the system architecture by applying the OPCAT tool.
서양우(Yangwoo Seo),최대웅(Daeung Choi),엄천섭(Chunsup Um),전동주(Dongju Jeon),김소정(Sojung Kim) 한국해군과학기술학회 2023 Journal of the KNST Vol.6 No.3
A method for implementing a reliability modeling design for system of systems was presented. The analysis target was selected as the ○○ system of systems , and a reliability block diagram was prepared using BlockSim SW. Alternative analysis was performed on the reliability modeling design according to the increase of the reliability target value. The reliability modeling result satisfying 80 % or more of reliability was analyzed by the of the 6 out of 9 redundancy design of A sensor equipment. The reliability modeling result satisfying 90 % or more of the reliability was analyzed by 6 out of 9 redundancy design of A sensor equipment and standby redundancy design in three parallel elements of E supervisory equipment.
예측방법론 기반 연속형 계획 모델을 적용한 무기체계의 신뢰도 성장 계획
서양우(Yangwoo Seo),박은심(Eunshim Park),김용국(Youngkuk Kim),이관영(Kwanyoung Lee),김명수(Myungsoo Kim) 한국신뢰성학회 2018 신뢰성응용연구 Vol.18 No.3
Purpose: To develop the reliability growth planning for a subsystem of guided weapon system using PM2-Continuous model. Methods: The target MTBF of the subsystem is set by allocating the system target MTBF to the lower level, where ARINC method is applied. Other model parameters such as initial MTBF, management strategy ratio and average fix effectiveness factor are chosen from historical growth parameter estimates. Given the values of model parameters, the reliability growth planning curve using PM2-Continuous model is constructed and the sensitivity analyses are performed for the changes of model parameters. Results: We have developed the reliability growth plan for a subsystem of guided weapon system using PM2-Continuous model. It was found that the smaller the ratio of initial MTBF to target MTBF, the smaller the management strategy ratio, the smaller the average fix effectiveness factor, and the shorter the development test period, the higher reliability growth is required. Conclusion: The result of this study will be used as a basis for establishing the reliability growth plan, the test period setting and the budget appropriation for the similar system entering the system development stage in the future.
서양우(Yangwoo Seo),권영관(Youngkwan Kwon),서무경(Mukyung Seo),용화영(Hwayoung Yong),정재우(Jaewoo Jung),이학재(Hakjae Lee) 한국해군과학기술학회 2024 Journal of the KNST Vol.7 No.1
Quality management is an activity that is continuously managed to meet quality requirements. This paper aims to improve quality through the development of the quality management system in integrated product support. First, the scope of the quality target is identified based on the quality control gate. After that, a plan to carry out improved quality activities was proposed by assigning responsibility for quality review, agreement, and approval of consumer and development agency. Using this quality management system, measurements of improvement are clearly identified. Also, product, processor, and person centered quality control can be performed through step-by-step Q-gate.
서양우(Yangwoo Seo),성형민(Hyeongmin Seong),우민규(Mingyu Woo),지혜진(Hyejin Ji) 한국해군과학기술학회 2023 Journal of the KNST Vol.6 No.4
Reliability prediction is the most basic task in performing integrated product support, and should be managed as a very important measure in terms of operating and maintaining. This paper conducted a reliability prediction in the military field for a commercial computer. As a result of calculating the failure rate using Windchill SW according to the reliability prediction procedure, it was 81.333194 failures/hours. In this case, MTBF was calculated at 12,295 hours during MTBF conversion using the failure rate. In addition, an impact analysis according to the operating environment and operating time was performed. Since the operating environment and operating time of the equipment are different when operating the equipment, it was confirmed that the MTBF was calculated differently even if the same equipment was operated.