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이강헌(Lee Kang Heon) 한국항만경제학회 1994 韓國港灣經濟學會誌 Vol.10 No.-
China has officially noticed the policy of reform and opening and the policy of introducing foreign capitals in The 11th China's National Assembly on December 1978, and then the investment of Hong Kong, Makao and Taipei enterprises have been increased by noticing The Law of Managing the Enterprise with China-Foreign Country Joint Stock on 1979,and finally the boom of investment by foreign enterprises three times on 1984,1988 and 1992 under the auspices of Teng Hsiao-ping's positive policy of opening.<br/> After the diplomatic ties with China on August 1992, the economical exchange between the two is speedly widened. The amount of trade of two countries is increasing over 5 percentages in recent years, and China is realized as our third counterpart for trade, and our country as China's fourth counterpart for trade.<br/> And, in case of investment, the sum of investment to China was below 100 million dollars until the end of 1990 has reached beyond 350 million dollars in the end of 1992, and the items of investment are widely and variously enlarged from the light industrial field such as shoes, textile, toy etc. to the electronic field such as TV,VCR etc.<br/> The investment countries are mainly the Asian industialized national such as Hong Kong, Taipei, Japan etc. and U.S.A., and our country 470 million dollars for 646 cases from the remainder as of the end of 1993.<br/> The policy of foreign investment inducement in China., as seen in the above, recalls the figures of investment in Korea and Japan in the past, which can be judged as a development policy enough to make true the step by step industrialization through a direct investment by foreign enterprises.<br/> In the meanwhile, I can say that the causes for the background of foreign enterprise's investment are China's cheap but abundant manpower, the thick intelligential levels of new education, inducement policy for foreign capitals, will for high-level economy growth and big potential market etc.<br/> But, our investment to China is never beyond I percentage among the entire investments of foreigners, and it is a reality that the places of investment are restricted only to neighboring spots such as three provinces including San Dong,Dong Bule<br/> The reasons for which our investment to China is trivial are several, the biggest one of which the local information to China's investment is not well delivered, and the mind to invest is not yet formed. I, in this article, would like to suggest the strategy on investment activation to China by compensation trade as a part of the scheme of investment activation to China which continues an economical growth of 10 percentages or so and has a big potential market now.
디지털 트윈 기술을 활용한 음향-진동 배관 시스템의 가상 계측 기술 개발
오승인(Seungin Oh),이강헌(Kang-Heon Lee),안광현(Kwanghyun Ahn),유용균(Yonggyun Yu),김기환(Kihwan Kim),김진균(Jin-Gyun Kim) 대한기계학회 2021 大韓機械學會論文集A Vol.45 No.9
본 연구에서는 유체-고체 연성 배관의 가상센서 시스템을 구성하는 방법을 제안하였으며, 그 신뢰성을 실제 구조물을 대상으로 검증하였다. 제안된 시스템은 유체-고체 연성 배관의 계측되지 않은 변위, 압력, 작용하중 등의 응답을 간접적으로 추정할 수 있다. 대상 구조물의 물리적 특성을 모사하기 위해 음향-진동 유한요소 모델을 활용하였으며, 신뢰성 향상을 위하여 음향-진동 유한요소 모델의 특성을 고려한 업데이팅 기법을 적용하였다. 또한 음향-진동 유한요소 축소모델링 기법을 적용하여, 제안된 가상 센싱 기법의 실시간 적용이 가능하도록 디지털 트윈 모델을 구축하였다. 업데이트 및 축소된 유한요소 모델을 기반으로 시간적분 기법을 적용하여, 구조물 전체의 실시간 응답을 추정할 수 있는 가상 센싱 시스템을 구성하였다. 개발된 기술은 L자형 배관 시험체에서 그 성능을 검증하였다. In this study, we present the framework of a virtual sensing system for a vibro-acoustic structure. The system can estimate the time-transient responses at the unmeasured points of a vibro-acoustic structure, including displacements, pressures, and applied forces. A coupled vibro-acoustic finite element (FE) model is then used as a numerical model of the target structure, and the model is updated using the sensitivity-based FE model updating technique for vibro-acoustic systems. A multiphysics reduced-order modeling approach is then applied to the model to alleviate the computational burden of real-time computation. Based on the pre-processed FE model, a time integration technique is implemented to estimate the unmeasured responses of the target structure. The performance of the suggested virtual sensing system is finally evaluated by implementation on an L-shaped pipe structure.
SMART 원자로 노내계측기 지지 구조물의 접수 진동 특성
이규만(Gyu Mahn Lee),안광현(Kwanghyun Ahn),이강헌(Kang Heon Lee),이재선(Jae Seon Lee) 대한기계학회 2020 大韓機械學會論文集A Vol.44 No.9
원자로 내진 해석 시 해석 효율을 위해 복잡한 원자로 형상을 1차원 보 요소로 등가하여 해석하는 방법이 주로 활용된다. 1차원 등가 해석 모델 생성 시 원자로 냉각재에 의한 유체 부가 질량 효과를 고려하기 위해서는 일반적으로 각 기기별 등가 모델에 부가 질량을 추가하거나 등가 유체 보 요소 등을 활용한다. 정상 운전 시 항상 접수 상태에 있는 다른 구조물과는 달리 SMART 원자로의 노내계측기 지지 구조물의 경우 구조물에 접하는 냉각재 자유 수면의 수위가 운전 조건에 따라 상시적으로 변화하므로 유체의 부가 질량 효과에 따른 구조물의 동특성이 정상 상태에서도 변화하는 특성을 가지고 있다. 본 연구에서는 주변 냉각재 수위 변화에 따른 SMART 원자로의 노내계측기 지지 구조물에 대한 동특성 변화를 분석하고 정량화하여 향후 내진 모델 작성 시 효율적으로 활용될 수 있도록 한다. One-dimensional equivalent model is widely utilized to improve the efficiency of a time-history seismic analysis for a nuclear reactor with complicated shape and arrangement. In the equivalent model, the added mass effect caused by the reactor coolant can be considered using a fluid element or adding a fluid mass to the structural model. In contrast to other structures whose whole part is submerged in the reactor coolant, a part of the in-core instrument support structure in a SMART is submerged in the reactor coolant, and the submerged volume changes as per reactor operating condition. Thus, in this study, the acoustic modal characteristics of an in-core instrument support structure was quantitatively investigated under various coolant levels. The results of this study can be utilized for the development of seismic model for in-core instrument support structure.