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김홍진,조지성,주석준,황재승 한국풍공학회 2010 한국풍공학회지 Vol.14 No.1
<P>TLD(Tuned Liquid Damper)나 TLCD(Tuned Liquid Column Damper)와 같이 액체를 질량체로 사용하는 부가질량형 감쇠기의 경우 동특성추정을 위하여 실제 크기의 진동제어기를 공장에서 제작하여 실험하는 것이 불가능하다. 또한 TMD(Tuned Mass Damper)의 질량체를 콘크리트로 사용하는 콘크리트 TMD의 경우에도 공장실험에서 콘크리트를 타설할 수 없기 때문에 완성된 TMD의 정확한 동적특성을 파악하는 것이 어렵다. 따라서 본 논문에서는 공장 가조립을 통한 실험을 실시하여 동적특성을 추정하기 어려운 경우에 대하여 현장실험을 통한 동특성추정 기법에 관하여 소개하고자 한다. 이를 위해 건물과 진동제어기의 연계된 운동방정식(Coupled equation of motion)으로부터 비연계 운동방정식(Decoupled equation of motion)을 유도한다. 유도된 비연계 운동방정식을 기반으로 건물의 응답과 진동제어기의 응답을 각각 시스템 식별을 위한 입력과 출력으로 하여 일반적인 시스템기법을 이용하여 동특성을 추정할 수 있도록 한다.</P>
초고층 주거용 건물의 풍진동 저감을 위한 LCVA 설계 및 시공
김홍진,김현배,조지성,유은종,조봉호,이상현 대한건축학회 2010 大韓建築學會論文集 Vol.26 No.1
<P>Increasing height of tall buildings often requires supplementary damping system for occupants comfort in windy condition. This paper presents design and construction of liquid column vibration absorbers (LCVA) installed in a 64-story building, which is the highest residential building with flat plate structural system in Korea, for mitigation of wind-induced motion. LCVA is a special type of secondary mass-type dampers relying on the motion of a column of liquid in a U-shaped container to counteract the forces acting on the structure. Since it has different dimensions of vertical and horizontal portions of container, it has benefits of easy tuning and wide natural frequency range. First, an experiment using 1/20 scaled model is presented for control performance evaluation of LCVA. In the experiment, the test structure is excited using sinusoidal force with varying frequencies and the control performance is evaluated comparing the dynamic response of the structure with LCVA with one without LCVA. Next, design and installation of LCVA is presented along with field measurement and tuning process. The analysis results of full scale filed measurement show that LCVA increases the damping ability of building effectively.</P>
Economic Cooperation since 1990 between Korea and Mongolia: An Evaluation and Prospects
김홍진 한국몽골학회 2010 몽골학 Vol.0 No.29
This paper reviews and evaluates the outcome of economic cooperation between Korea and Mongolia for the last 20 years, and suggests the agenda for the expansion of economic cooperation in the future. Korea and Mongolia have pursued a close cooperation after the establishment of an official diplomatic relationship in 1990. The enlargement of trade and investment in the economy area would be especially worthy of close attention. The trade volume between two countries has expanded about 100 times from 1990 to 2008. Korea came second in Mongolia's exports, and third in Mongolia's imports in 2008. Korea now appears to be one of the most important trade partners for Mongolia. Nevertheless, Mongolia reveals a significant deficit to Korea in commodity balance. With respect to FDI in Mongolia, Korea holds the third rank, preceded by China and Canada. For the expansion of economic cooperation between two countries, the next agenda could be suggested in four parts. First, a preliminary feasibility study for a free trade agreement. Second, more and stronger cooperation in the area of direct investment and technology support to Mongolia. Third, concrete cooperation for tourism development of Mongolia. And forth, sharing Korea's experience of rapid economic growth over the past five decades with Mongolia. This paper reviews and evaluates the outcome of economic cooperation between Korea and Mongolia for the last 20 years, and suggests the agenda for the expansion of economic cooperation in the future. Korea and Mongolia have pursued a close cooperation after the establishment of an official diplomatic relationship in 1990. The enlargement of trade and investment in the economy area would be especially worthy of close attention. The trade volume between two countries has expanded about 100 times from 1990 to 2008. Korea came second in Mongolia's exports, and third in Mongolia's imports in 2008. Korea now appears to be one of the most important trade partners for Mongolia. Nevertheless, Mongolia reveals a significant deficit to Korea in commodity balance. With respect to FDI in Mongolia, Korea holds the third rank, preceded by China and Canada. For the expansion of economic cooperation between two countries, the next agenda could be suggested in four parts. First, a preliminary feasibility study for a free trade agreement. Second, more and stronger cooperation in the area of direct investment and technology support to Mongolia. Third, concrete cooperation for tourism development of Mongolia. And forth, sharing Korea's experience of rapid economic growth over the past five decades with Mongolia.
김홍진,최선영,조성우,황재승,유은종,Kim, Hong-Jin,Choi, Sun-Young,Jo, Seong-Woo,Hwang, Jae-Seung,Yu, Eun-Jong 대한건축학회 2011 대한건축학회논문집 Vol.27 No.12
The wind response and performance of a tuned mass damper (TMD) are presented based on the system identification and the inverse wind load estimation. The TMD was installed on a 39-story, 184.6m steel building located in Incheon, Korea with a monitoring system consisting of an anemometer, accelerometers, and internet-based data logging system. On Sep. 2, 2010, the building experienced the Kompasu Typhoon, in which the peak wind speed, measured by an anemometer installed on the roof floor, was 49.7 m/s. In order to analyze the behavior of the building during the typhoon, the dynamic properties of building and TMD are identified from the measured responses. The modal wind load is then inversely estimated from the TMD and building accelerations using a Kalman filter, and the vibration reduction performance of the TMD is evaluated.