상수도 시스템 지진 신뢰성의 합리적 평가를 위한 적정 지반운동예측식 결정

최정욱,강두선,정동휘,이찬욱,유도근,조성배,Choi, Jeongwook,Kang, Doosun,Jung, Donghwi,Lee, Chanwook,Yoo, Do Guen,Jo, Seong-Bae 한국수자원학회 2020 한국수자원학회논문집 Vol.53 No.9

The water supply system has a wider installation range and various components of it than other infrastructure, making it difficult to secure stability against earthquakes. Therefore, it is necessary to develop methods for evaluating the seismic performance of water supply systems. Ground Motion Prediction Equation (GMPE) is used to evaluate the seismic performance (e.g, failure probability) for water supply facilities such as pump, water tank, and pipes. GMPE is calculated considering the independent variables such as the magnitude of the earthquake and the ground motion such as PGV (Peak Ground Velocity) and PGA (Peak Ground Acceleration). Since the large magnitude earthquake data has not accumulated much to date in Korea, this study tried to select a suitable GMPE for the domestic earthquake simulation by using the earthquake data measured in Korea. To this end, GMPE formula is calculated based on the existing domestic earthquake and presented the results. In the future, it is expected that the evaluation will be more appropriate if the determined GMPE is used when evaluating the seismic performance of domestic waterworks. Appropriate GMPE can be directly used to evaluate hydraulic seismic performance of water supply networks. In other words, it is possible to quantify the damage rate of a pipeline during an earthquake through linkage with the pipe failure probability model, and it is possible to derive more reasonable results when estimating the water outage or low-pressure area due to pipe damages. Finally, the quantifying result of the seismic performance can be used as a design criteria for preparing an optimal restoration plan and proactive seismic design of pipe networks to minimize the damage in the event of an earthquake.

상수관망 시스템의 골격화 기법 평가

최정욱,강두선,Choi, Jeong Wook,Kang, Doosun 한국수자원학회 2015 한국수자원학회논문집 Vol.48 No.10

대규모 상수관망 시스템의 운영비용 절감을 위한 펌프장 운영 최적화 연구가 최근 활발히 진행되고 있다. 이러한 상수관망 시스템 운영 최적화에 대한 연구를 수행하기 위해서는 짧게는 24시간, 길게는 1주일 이상의 시간모의가 필수적이며, 최적화 알고리즘과의 연계를 통한 시뮬레이션이 요구된다. 대규모 상수관망의 경우 관로 및 절점의 수가 수 천 혹은 수 만개에 달해 수리해석 및 최적화에 많은 시간이 소요되며 실시간 운영을 목적으로 하는 경우 모형의 적용에 한계가 발생한다. 이처럼 모의시간에 대한 문제를 해결하기 위해서는 해당 상수관망 시스템의 수리 거동, 수질 해석 결과를 변화시키지 않는 범위에서 관망을 간소화 할 필요가 있다. 본 연구에서는 국내에서 실제로 운영되고 있는 송, 배수 시스템의 일부를 대상으로 시스템 간소화, 즉 골격화(Skeletonization) 연구를 진행하였으며, 모두 네 가지의 골격화 기법을 비교, 평가하였다. 본 연구에서 제안된 골격화 기법을 통해 대규모 상수관망의 해석에 소요되는 시간을 단축함으로써, 실제 상수관망의 실시간 운영 모듈 개발에 도움이 될 것으로 기대한다. Studies of optimizing pump operation in water distribution networks (WDN) are receiving spotlight in recent days. However, the water networks are quite complex including thousands of or even tens of thousands of nodes and pipes, thus simulation time is an issue. In some cases, implementing a computer model for pump operation decisions is restrictive due to intensive computation time. To that end, it is necessary to reduce the simulation time of water networks by simplifying the network layout. In this study, WDN skeletonization approaches were suggested and applied to a real water transmission network in South Korea. In skeletonizing the original network, it was constrained to match the water pressure and water age in the same junction locations to maintain the hydraulic and water quality characteristics in the skeletonized network. Using the skeletonization approaches suggested in this study, it is expected to reduce the simulation time of WDN and apply for developing a computer module of WDN real-time optimal operation.

저류특성을 고려한 북한강수계 발전용댐의 유형 구분방안 제시

최정욱,정기문,강두선,안정환,김태순,Choi, Jeongwook,Jeong, Gimoon,Kang, Doosun,Ahn, Jeonghwan,Kim, Taesoon 한국수자원학회 2021 한국수자원학회논문집 Vol.54 No.8

Climate change threatens the security of domestic water resources in South Korea. To overcome the potential water shortage, various approaches are being studied by alterning the operation of dams or by integrated operation of multiple dams and reservoirs. However, most of the related researches were developed and applied for multi-purpose dams, and few studies were conducted for the hydropower dams. The main purpose of the hydropower dam is to generate electric energy; however, the potential water shortage due to prolonged droughts brings the idea to supply water from the hydropower dam in the basin. To that end, it is required to estimate the water supply ability of the hydropower dams. In this study, we proposed a methodology to classify the hydropower dam into a "storage-type" and "run-of-river type" dam. The proposed approach was demonstrated using the hydropower dams located in North-han River basin. The results of this study are expected to contribute for further analysis of the hydropower dams, such as evaluation of water supply capacity and drought mitigation purpose operation of the hydropower dams.

건설공사 통합기준의 코드체계

최정욱,김지상,신현목,Choi, Jung-Wook,Kim, Jee-Sang,Shin, Hyun Mock 한국콘크리트학회 2015 콘크리트학회지 Vol.27 No.2

RFID 기술을 적용한 도서관리 및 검색 솔루션 개발

최정욱(Choi Jung-Wook),오동익(Oh Dong-Ik) 한국산학기술학회 2005 한국산학기술학회논문지 Vol.6 No.4

국내 도서관의 양적·질적 성장에 따라 도서관의 장서 수와 이용자 수가 급증하고 있으나, 이에 따른 도서 관리의 어려움 또한 증대되고 있다. 특히, 도서가 지정된 서가에 위치해 있지 않아 이용자들이 도서를 찾는데 어려움을 겪는 경우가 빈번하다. 이러한 문제의 해결을 위해 본 연구에서는 RFID 기술을 이용하여 보다 편리하게 도서의 위치를 파악할 수 있는 도서 검색 시스템인 ‘R-LIM(알림)’ 시스템을 개발 하였다. ‘R-LIM’ 시스템을 활용하면 도서의 현재 위치를 실시간으로 파악할 수 있어 도서를 보다 쉽게 찾을 수 있을 뿐만 아니라, 도서를 정위치 시키는데 소요되는 시간도 크게 줄일 수 있다. 이 방식은 도서도난방지 등의 부수적 효과도 가져올 수 있다. With quantitative and qualitative growth of libraries, number of books and patrons of the library are increasing rapidly. However, the growth brings up many new challenges to the library management process. One of the noticeable challenges is to ease the process of locating books users want. The purpose of this research is to develop a positioning system that can help library users locate books without going through tedious shelf searching process. The R-LIM system we propose can be used for such purpose. It is based on the RFID technology, and consists of tags, readers, antennas, wireless terminals and light-emitting diodes. With the system, one may not only locate books easily, but also may put the book back to appropriate shelves promptly. Since R-LIM can do library inventory in real-time, it can be used for anti-thief purposes as well.

RFID와 무선 단말기를 이용한 도서검색 시스템 설계

최정욱(Jung-Wook Choi),손재락(Jae-Rak Son),오동익(Dong-Ik Oh),강병권(Byeong-Gwon Kang),박상정(Sang-Jung Park) 한국멀티미디어학회 2003 한국멀티미디어학회 학술발표논문집 Vol.2003 No.2

선거제도, 사회구조와 정당체계: 인도네시아 1995년과 1999년 총선거

최정욱 ( Jung Ug Choi ) 한국동남아학회 2005 동남아시아연구 Vol.15 No.1

무선단말기 컨텐츠 제공을 위한 모바일 어플리케이션 개발에 관한 연구

최정욱(Jung-Wook Choi),오동익(Dong-Ik Oh),이경호(Kyung-Ho Lee),김중배(Jung-Bae Kim) 한국멀티미디어학회 2002 한국멀티미디어학회 학술발표논문집 Vol.2002 No.2

조합하중을 받는 무량판 구조의 강성감소 계수

최정욱(Choi Jung-Wook),윤정배(Yoon Jeong-Bae),송진규(Song Jin-Gyu) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.6

Cracking of slabs would be caused by applied loads and volume changes during the life of a structure. And it reduces flexural stiffness of slabs and increases lateral flexibility. Thus, a stiffness reduction phenomenon due to slab cracking must be considered in stiffness assumptions for lateral drift calculations. A combined analytical and experimental study about the stiffness reduction factor of slabs in a flat plate structure is conducted. In analytical study, the stiffness reduction factor is changed by the magnitude of gravity loads and column spans, but its variation is much reduced by lateral loads. The stiffness reduction factor for combined loads ranges from a half to a quarter. This range matches the commentary specified in ACI 318-02. A test of nine-connection flat plate frames constructed at fifty percent of full scale is undertaken. This test provides data on lateral response at the service gravity load level. Based on a 0.2 percent drift criterion for building serviceability and a 0.5 percent drift criterion for story safety, the comparisons between test results and analysis results using the effective beam width model are performed. The experimental study shows that the stiffness reduction of the interior connection is much smaller than the stiffness reduction of the other connections, and the effective beam width model with a constant stiffness reduction factor of one-third gives a close stiffness estimate for the test structure.

북한 예산수입법제의 변화

최정욱(CHOI, Jeong Wook) 통일과 북한법학회(구 북한법연구회) 2020 북한법연구 Vol.24 No.-

해방 후 북한 예산수입법제의 변화 과정은 세금제도의 폐지와 사회주의 예산수입체계로의 전환이라는 중첩적인 과정으로 요약할 수 있다. 1974년 세금제도의 완전한 폐지를 선언한 후 김일성 시대에는 큰 변화 없이 거래수입금과 국가기업리익금 중심의 사회주의 예산수입체계가 유지되었다. 김정일 시대에 들어서 2002년 7.1 경제관리개선조치와 함께 거래수입금과 국가기업리익금이 통합된 국가기업리득금 체계 하에서 가격현실화 조치, 한도가격 제도 도입, 계획외 경영활동을 포함하는 번수입 지표의 적용 등 ｢시장 기반 사회주의 예산수입체계｣로의 전환이 시작되었고, 2005년에는 ｢국가예산수입법｣이 제정되었다. 김정은 시대에는 형태적으로 1994년 이전의 거래수입금 및 국가기업리익금 체계로 회귀하였다. 하지만 내용적으로는 기업소지표를 통하여 시장경제 영역을 계획 영역에 편입시키고 주문계약을 허용하여 시장가격의 적용을 확대하는 등 ｢시장 기반 사회주의 예산수입체계｣로서의 성격이 더욱 강화되었다. 현재의 예산수입체계는 여전히 사회주의 예산수입체계의 형태를 유지하고 있는 것으로서 ｢시장경제형 조세제도｣라고 할 수는 없다. 하지만 시장화의 확대 및 시장의 제도화가 지속되는 한, 궁극적으로 ｢시장경제형 조세제도｣의 도입은 필요하고 또한 불가피할 것이다. After the national liberation, North Korea has pursued the abolition of tax system and at the same time shifted to a socialist budget revenue system. The tax system was finally abolished in 1974 and the socialist budget revenue system remained unchanged until the early Kim Jong-il era. In the Kim Jong-il era, along with the 7.1 reformative measures in 2002, there have been significant changes in the budget revenue system, which can be interpreted as the beginning of the transition from the classical ‘plan-based’ to the ‘market-based’ system. In 2005, the Law on National Budget Revenue was enacted. In the Kim Jong-un era, the budget revenue system has apparently returned to the pre-1994 system through the amendment of the Law on National Budget Revenue in 2011. However, in substance, its ‘market-based’ characteristics were further strengthened, while it cannot yet be said as a market-based ‘tax system’, as it adheres to the form of a socialist budget revenue system. However, as long as marketization continues to expand, the introduction of market-based ‘tax system’ will be necessary and inevitable.