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X밴드 고주파 채널용 로터리 조인트 천이구조의 대역확장 설계
김시옥(Siok Kim),이창형(Changhyeong Lee),한다정(Dajung Han),노돈석(Donsuk Roh),강승택(Sungtek Kahng) 대한전기학회 2017 전기학회논문지 Vol.66 No.3
In this paper, we show the design of a rotary joint transition for the X-band channel in a rotatable microwave communication system. The transition seems complicated to make a channel between two coaxial cables through a cylindrical waveguide. To make a broad-band performance in the X-band with low insertion loss and return loss given the constraint on the length and radius of this complicated-looking cylindrical structure, Genetic Algorithm optimization is adopted to check the validity of an intensive parametric study in the design. The structure is fabricated and tested to show how valid the design method is as well as good frequency responses.
천마 탐지레이더 Limit&STC 조립체 개선을 통한 탐지성능 향상
윤재복,김시옥,금종주,Yoon, Jaebok,Kim, Siok,Keum, Jongju 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.1
In this paper, we have described the performance improvement of surveillance radar to prevent damage or malfunction of surveillance radar RF head unit due to the strong reflections caused by artificial obstacles at close range. We have proposed a technique to improve the performance of the RF head unit as a solution to overcome the limitations of the operating system and improve radar performance. We have verified the effectiveness of the improvement by comparing the before and after results applied to actual system.
우선부품목록 선정방안 제시 및 공용화 검색 시스템 구축
윤재복 ( Yoon¸ Jaebok ),김시옥 ( Kim¸ Siok ),문진규 ( Moon¸ Jinkyu ),홍성민 ( Hong¸ Sungmin ),임호정 ( Lim Hojung ),김상한 ( Kim¸ Sanghan ) 한국품질경영학회 2020 품질경영학회지 Vol.48 No.4
Purpose: The purpose of this study is to present a preferred parts list, establish a search tool for common parts, and propose a development plan for parts management. Methods: When selecting the preferred parts list, the weight of the selection of the military parts and the online site of the civilian parts were taken into account. By establishing a database of selected preferred parts list, we have established a system for searching common parts. Results: The results of this study are as follows; In order to establish parts management work in Korea's defense, it is necessary to improve the Defense Acquisition Program Act, Enforcement Decree (Rules), and the Regulations for Defense Acquisition Program Administration. Development of performance indicators for parts management is required, and establishment of procedures and standards for selection of preferred parts lists is required. Considerations for the selection of preferred parts list include whether they are used a lot in civilian products, whether they are used a lot, whether they are certified suppliers, whether they are national and industrial standard products, whether they perform well considering reliability, durability, and quality, and whether they can be supplied continuously. Conclusion: It is necessary to establish policies and systems related to parts management and to establish criteria for selecting preferred parts list for the development of domestic parts management tasks.