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이우상(Woosang Lee),이민우(Minwoo Yi),소준호(Joonho So),김동석(Dong-seok Kim),윤영중(Young Joong Yoon) 한국전자파학회 2016 한국전자파학회논문지 Vol.27 No.5
밀리미터파 대역에서 동작하는 안테나의 성능 측정을 위한 컴팩트 레인지 설계 및 실험 결과에 대해 소개한다. 전기적 거대 구조인 컴팩트 레인지의 포물면 반사판에 의해 형성되는 측정영역의 평면파를 해석하기 위하여 물리광학 기법을 적용하였다. 제작한 밀리미터파 컴팩트 레인지는 측정영역 전계 분포 실험과 고이득 안테나 측정을 통해 성능을 검증하였다. 동작 주파수 75~110 GHz에서 측정영역 직경 50 cm를 갖도록 설계한 컴팩트 레인지의 전력 균일성은 0.75 dB 이하로 측정되었다. We introduce the design technique and test results of a millimeter-wave compact antenna test range. Physical optics is employed for the analysis of the plane wave collimated by an electrical large parabolic reflector of the compact range in the test zone. The performance of the manufactured compact range is verified with the field probing test on the quiet zone and the measurement of high gain antenna. A millimeter-wave compact range designed in the frequency range of 75~110 GHz with a diameter of the test zone of 50 cm shows the magnitude variation of less than 0.75 dB.
이동기 ( Lee Dong-gi ),이우상 ( Lee Woosang ),이규 ( Lee Giu ),허광희 ( Heo Gwanghee ),전준룡 ( Jeon Joonryong ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.7 No.1
In this paper, design and analysis of robust feedback control system are presented using the state-space approach. When mathematical models are used to describe real structural system, the differences between the mathematical models and the real structures can cause poor performance of control systems, especially for large-scale structures due to the structural uncertainties. Therefore, when controllers are used to reduce the random vibration caused by rain and wind loads, we cannot expect that control systems achieve satisfactory control result. Hence, it is important that robust feedback control systems must be designed considering system uncertainties. Considering the robust feedback control to carry out the control of uncertain systems, system stability can be guaranteed for structural perturbations occurring by modeling error. In order to explore the system stability with perturbation, the stability of nominal system should be stable. For application, the uncertain systems considering natural frequency and design constraints i.e, structures that have structural perturbations happening by mass and stiffness, are adapted to develop unified controller algorithm, which is optimal and robust. And, to investigate the validity and performance of the algorithm, numerical simulation is illustrated. Numerical result shows that the designed controller can be applied very well to the problem of degradation of control system performance.
이동기(Lee Dong-Gi),이우상(Lee Woosang),이규(Lee Giu),허광희(Heo Gwanghee),전준룡(Jeon Joonryong) 한국구조물진단유지관리학회 2003 한국구조물진단학회 학술발표회논문집 Vol.- No.-
In this paper, design and analysis of robust feedback control system are presented using the state-space approach. When mathematical models are used to describe real structural system, the differences between the mathematical models and the real structures can cause poor performance of control systems, especially for large-scale structures due to the structural uncertainties. Therefore, when controllers are used to reduce the random vibration caused by rain and wind loads, we cannot expect that control systems achieve satisfactory control result. Hence, it is important that robust feedback control systems must be designed considering system uncertainties. Considering the robust feedback control to carry out the control of uncertain systems, system stability can be guaranteed for structural perturbations occurring by modeling error. In order to explore the system stability with perturbation, the stability of nominal system should be stable. For application, the uncertain systems considering natural frequency and design constraints i.e, structures that have structural perturbations happening by mass and stiffness, are adapted to develop unified controller algorithm, which is optimal and robust. And, to investigate the validity and performance of the algorithm, numerical simulation is illustrated. Numerical result shows that the designed controller can be applied very well to the problem of degradation of control system performance.
탄성고무매트를 이용한 교각의 지반반력계수와 동특성치의 상관관계 분석
허광희(Heo Gwanghee),이진옥(Lee Chin Ok),서동환(Sea Donghwan),이우상(Lee Woosang),전준룡(Jeon Joonryong) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 Vol.- No.-
The purpose of this paper is to make sure the equation which was found from the prior study is correct, by choosing an elastic rubber mat from the model pier through consideration of actual stiffness with the similarity of stiffness rate. In order to accomplish this task. The elastic coefficient of elastic rubber mat used average value through compression experiment. By applying achieved ground stiffness, we've performed dynamic property response experiment, then achieved dynamic property value. we've compared and analyzed the calculated value by the equation of ground stiffness from the prior study, with the value that achieved in this paper. The analysed result achieved a difference within 10 percent which is quite satisfactory. The result like this, leads to a decision that has no problem to maintain the structure by applying the 10 percent difference for safety assesment when generally considering the structure. Therefore we've once again verified the efficiency of method which used the computation of coefficient of subgrade reaction equation for safety assesment of pier.
유비쿼터스 컴퓨팅을 이용한 건설구조물의 유지관리를 위한 네트워크 실시간 무선계측시스템
허광희 ( Heo Gwanghee ),이규 ( Lee Giu ),이제훈 ( Lee Jaehoon ),이우상 ( Lee Woosang ),전준용 ( Jeon Joonryong ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.2
In this paper, an integrated framework of ubiquitous computing technologies, combining internet technologies and wireless measurements, is developed for infrastructure smart monitoring. This system is designed to communicate through TCP/IP protocol for a remote real-time management. Measured data for smart monitoring is send from the host computer through TCP/IP protocol from a wireless sensor system based on bluetooth technology. Also, management system is designed to respond to the request of network user on real time basis. Laboratory experimental tests are carried out on a self-anchored suspension bridge to verify the effectiveness of this measurement system. Ubiquitous management system is analyzed to estimate real-time wireless sensing capacity and evaluate its performance for monitoring purpose. Finally, the proposed smart management system is proved to be an efficient monitoring technique for infrastructure system.
허광희 ( Heo Gwanghee ),이우상 ( Lee Woosang ),이규 ( Lee Giu ),이동기 ( Lee Dong-gi ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.1
This paper presents a smart structure where civil structures are safely and effectively maintained, and proves its effectiveness by designing a self-obtained wireless sensing system which is internally equipped with CPU chip and so makes multiplex communication possible. The smart structure presented here is designed to monitor and meet any emergency efficiently, and it makes it possible to communicate back and forth between a transmitter and a receiver. In order to control each device in the sensing system and add the functions of data logger and DSP, a program is developed here. Specially this sensing system adopts a high-performance microcontroller, a wireless modem, and MEMS-based accelerometers. Its effectiveness is proved by showing in an experiment that both multiplex communication and duplex communication are functioning in the system.
실시간 교량 모니터링을 위한 MEMS 기반의 스마트 센서 시스템
김만구(Kim Mangoo),이진옥(Lee Chinok),허광희(Heo Gwanghee),이우상(Lee Woosang) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.2
The purpose of this study was to use Micro Electro Mechanical Systems(MEMS) technology to develop a smart sensor system and apply it to real-time monitoring of a bridge structure. MEMS refers to a system in which electronic circuits and mechanical parts are integrated on a chip. The existing sensors of this type used mechanical conversion system and were high in price and relatively big in size. However, the new sensor using MEMS technology can be mass produced, low in price, and small in size to be suitable for electronic circuits and smart sensors. This study implemented indoor experiments to evaluate basic performance of the new sensor system and fabricated a bridge model to gather data and evaluate applicability of the new sensor onto the real-time monitoring of a bridge structure. The experiments resulted in the conclusion that MEMS-based smart sensor system can be applied to real-time monitoring of bridges.
실시간 교량 모니터링을 위한 MEMS 기반의 스마트 센서 시스템
김만구 ( Kim Mangoo ),이진옥 ( Lee Chinok ),허광희 ( Heo Gwanghee ),이우상 ( Lee Woosang ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.2
The purpose of this study was to use Micro Electro Mechanical Systems(MEMS) technology to develop a smart sensor system and apply it to real-time monitoring of a bridge structure. MEMS refers to a system in which electronic circuits and mechanical parts are integrated on a chip. The existing sensors of this type used mechanical conversion system and were high in price and relatively big in size. However, the new sensor using MEMS technology can be mass produced, low in price, and small in size to be suitable for electronic circuits and smart sensors. This study implemented indoor experiments to evaluate basic performance of the new sensor system and fabricated a bridge model to gather data and evaluate applicability of the new sensor onto the real-time monitoring of a bridge structure. The experiments resulted in the conclusion that MEMS-based smart sensor system can be applied to real-time monitoring of bridges.