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접합분리 시험체를 사용한 구조체 콘크리트 강도 측정에 관한 연구
정광식(Jung Kwang-Sik),이선호(Lee Sun-Ho),백민수(Paik Min-Su),정상진(Jung Sang-Jin) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.9
The evaluation method of structural concrete strength in present building construction field involves a lot of problems and difficulties. The reasons are, incase of destruction test by core collection, low use frequencies due to limitation of core collection and difficulties of execution, and impossibility of initial strength estimation. In case of strength test with management specimen, different environmentcompared to the structure environment cause problems about estimating precise structure strength. Therefore, it is required to develop structure direct strength test that has test values and credibility above the ones obtained by core specimen collection strength test and to eliminate experimental defects caused by easy execution and simple test methods. The management of concrete strength can be justified when credibility of structure strength is ensured by measuring the strength of structure concrete built in the construction field by joint separation technique that can directly assess structure strength without affecting the structure itself. The purpose of this research is to improve the product management method of structure concrete by building the stability and credibility of concrete product management.
단위부재의 Mock-up Test를 통한 접합분리 시험체의 압축강도 평가
정광식(Jung Kwang-Sik),기전도(Ki Jun-Do),김광기(Kim Kwang-Ki),김정진(Kim Jeong-Jin),이영도(Lee Young-Do),정상진(Jung Sang-Jin) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.5
Existing non-destructive test for evaluation of concrete compressive strength may show deviation in results analysis due to deterioration of precision by strength calibration and dry or humid condition by age, so there needs be testing method to determine long term structural internal force by collecting specimen with no damage of structure and measuring compressive strength through destruction test. This research applied to mock-up member the compressive strength evaluation method using joint separation mold that can plan and produce specimen cured in the same composition environment as concrete structure by attaching arbitrary(joint separation) to the form before concrete piling, and as a result, the management specimen was contrary to the hydration temperature of the member or was affected by external atmospheric temperature, however the joint separation specimen connected to structure and managed in the same environment showed a temperature curve similar to the member and decrease in temperature difference. Additionally, from initial age, with the compressive strength of joint separation specimen most similar to core strength, stable compressive strength can be evaluated up to design criteria strength 100㎫, so the method is proposed as an evaluation technique that can confirm highly reliable concrete quality.
3상 불평형 전원 조건하의 능동전력필터를 위한 새로운 평균전력 알고리즘
정광식(Kwang-Sik Jung),정영국(Young-Gook Jung),김영철(Young-Cheol Kim),임영철(Young-Cheol Lim) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
본 연구에서는 3상이 불평형된 전원 조건하에서 비선형 부하전류를 유효성분, 기본파 무효성분 그리고 왜형성분으로 분해한 후, 능동전력필터를 제어할 수 있는 새로운 평균전력 알고리즘을 제시하였다. 제안된 방법의 타당성을 입증하기 위해, 15% 불평형된 3상 전원 전압하에서 실험을 수행하였으며, 종전의 평균전력 알고리즘에 비하여 새로운 평균전력 알고리즘의 유용성을 입증할 수 있었다.
정광식(Kwang-Sik Jung),이종학(Jong-Hak Lee),김영완(Young-Wan Kim),라영은(Young-Eun Ra),전정익(Jung-Ik Jeon) 한국전기전자학회 2020 전기전자학회논문지 Vol.24 No.2
본 논문에서는 함정의 합내통신, 함외통신, 방송, 전화 등의 통합통신 안테나 중 함외통신용 UHF 대역 통합통신 안테나를 통합마스트에 탑재 가능한 평면형으로 설계했다. 제안된 통합마스트 탑재용 안테나는 해군의 한국형차기구축함(KDDX)에 적용되는 통합통신용 안테나로 작전능력, 생존성 강화와 운용성과 정비성의 향상 등 ‘복합경사’ 구조를 포함하는 최적화된 형태의 통합통신용 안테나이다. 기존 회전식 레이더와 다수의 모노폴 형태의 통신용 안테나를 마스트 외관에 불규칙한 형태로 부착된 형태에서 평판형 통합통신용 안테나를 포함하는 통합 마스트 형상으로 변경하여 레이더 반사 면적 지수(RCS)를 크게 낮추며 해외제품 대비 고이득 광대역 안테나를 개발목표로 한다. This paper, UHF band integrated communication antenna for ship communication is designed as a flat type that can be mounted on the integrated mast among integrated communication antennas such as integrated communication, ship communication, broadcasting, and telephone of the ship. The unified mast mounted antenna is an integrated communication antenna applied to the Navy’s KDDX, which is an optimized type of integrated communication antenna including a ‘composite slope’ structure including operational capability, survivability, and improved operability and maintainability. The existing rotary radar and a plurality of monopole-type communication antennas were changed from an irregularly attached shape to the mast exterior to an integrated mast shape including a flat-type integrated communication antenna. the radar reflection area index (RCS) is significantly lowered and compared to overseas products. The goal is to develop a gain broadband antenna.