콘덴싱 효과가 적용된 소형의 가스 온수기와 온수 보일러는 중대형 보일러보다 동일 열량에서 규격이 작고 운전효율이 높다. 이러한 소형 열원을 병렬로 연결하면 최적의 설계 열용량을 구현할수 있고 설치 공간이 절감되며 운전효율이 높다. 이를 캐스케이드 시스템이라 하며 건물의 규모와 용도를 고려한 열원 시스템 선택의 폭을 넓히고 소비자의 경제성향상과 더불어 정부의 에너지 정책에 부응하기 위해 대수 제어기등 주변 장비를 개발하여 보급하게 되었다.

Currently, the cable safety management of cable supported bridges is calculated by the ratio of the measured tension to the design tension. The measurement of the tension is performed by indirectly estimating the acceleration measured at the cable surface in terms of the tension. The method of converting the cable vibration response (acceleration) into the tension is disadvantageous in that the damage of the individual strand (or wire) in the cable is not clearly reflected in the tension because the measurement is not reliable and is managed only by the total tension. The purpose of this study is to improve the cable safety management system by evaluating how the damage of individual strand of MS type cable, which is mainly applied to cable-stayed bridges, affects the safety level managed by level of cable tension.

In the military and civil area a long-span temporary bridge for rapid construction is recently in demand. In this study the current state of technology and market is investigated as part of the planning research. The results show that the existing temporary bridges consist mainly of about 20m long span, and it takes 6 to 8 weeks to complete the construction. For an emergency restoration project in a short period a long-span temporary bridge for rapid construction requires the high-performance materials and the latest construction technology

In this study, a drone based structural health monitoring technique is introduced which uses a piezoelectric (PZT) transducer attached to a drone. With the PZT transducer, the electromechanical impedance (EMI) method is modified to be attached and re-attached onto a structure for damage identification. Since one of the possible principle technology is to keep the tube structure safe from damage, the idea introduced in this study opens up new possibilities of monitoring the integrity of the Hyperloop structure.

In this research, experiment and simulation plans for evaluating the performance of the cables used for cable-stayed type bridges is presented. 27 cables are prepared where each of the cables are introduced with either corrosion or/and fatigue damage. Then the acquired data is analyzed with the vibration characteristics to evaluate the performance of the cables subjected to the two damage types.

This study was conducted to build an emergency action plan (EAP) for cable-supported bridges in South Korea. First, accidents happened on Cable-supported bridges were investigated and categorized based on the types. Second, accident scenarios were built-up regarding the types. Two bridges were selected for planning the emergency action following the accident scenarios. The emergency action plan established in this study could be used for the management of cable-supported bridges in the future.