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김규용,양현석,박영필,Kim, Kyu-Young,Yang, Hyun-seok,Park, Young-Pil 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.10
Recently, the high-precision vibration attenuation technology becomes the essence fo the seccessful development of high-integrated and ultra-precision industries, and is expected to continue playing a key role in the enhancement of manufacturing technology. Vibration isolation system using an air-spring is widely employed owing to its excellent isolation characteristics in a wide frequency range. It has, however, some drawbacks such as low-stiffness and low-damping features and can be easily excited by exogenous disturbances, and then vibration of table is remained for a long time. Consequently, the need for active vibration control for an air-spring vibration isolation system becomes inevitable. Furthermore, for an air-spring isolation table to be successfully employed in a variety of manufacturing sites, it should have a guaranteed robust performance not only to exogenous disturbances but also to uncertainties due to various equipments which might be put on the table. In this study, an active vibration suppression control system using H.inf. theory is designed and experiments are performed to verify its robust performance. An air-spring vibration isolation table with voice-coil-motors as its actuators is designed and built. The table is modeled as 3 degree-of-freedom system. An active control system is designed based on $H_\infty$control theory using frequency-shaped weighting functions. Analysis on its performance and frequency responce properties are done through numerical simulations. Robust characteristics of$H_\infty$ control on disturbances and model uncertainties are experimentally verified through (i) the transient response to the impact excitation of the table, (ii) the steady-state response to the harmonic excitation, and (iii) the response to the mass change of the table itself. An LQG controller is also designed and its performance is compared with the $H_\infty$ controller.
콘크리트의 전염화물량 평가의 정밀도 향상에 관한 실험적 연구
김영선(Kim Young-Sun),김영덕(Kim Young-Duck),조봉석(Cho Bong-Suk),배기선(Bae Ki-Sun),김규용(Kim Kyu-Yong),김무한(Kim Moo-Han) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.1
Worldwide, Certification systems for standard of material and quality of product exist very variously. Korean industrial Standard (KS) is most representatively certification systems in Korea. But labolatory of korea uses often ASTM, RILEM and JIS and these standards do not get into unionization. so, Granted that experiment is same, result still can different. Therefore, this research measured chloride amount of hardened concrete using identical material and wished to improve accuracy of chloride estimation as that comparison evaluate to each examination.
콘크리트의 전염화물량 평가의 정밀도 향상에 관한 실험적 연구
김영선 ( Kim Young-sun ),김영덕 ( Kim Young-duck ),조봉석 ( Cho Bong-suk ),배기선 ( Bae Ki-sun ),김규용 ( Kim Kyu-yong ),김무한 ( Kim Moo-han ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.1
Worldwide, Certification systems for standard of material and quality of product exist very variously. Korean industrial Standard (KS) is most representatively certification systems in Korea. But labolatory of korea uses often ASTM, RILEM and JIS and these standards do not get into unionization, so, Granted that experiment is same, result still can different. Therefore, this research measured chloride amount of hardened concrete using identical material and wished to improve accuracy of chloride estimation as that comparison evaluate to each examination.
이영오 ( Lee Young-oh ),김선우 ( Kim Sun-woo ),윤현도 ( Yun Hyun-do ),김규용 ( Kim Kyu-young ),최경렬 ( Choi Kuyng-yuel ),강선종 ( Kang Sun-jong ),김대중 ( Kim Dae-jung ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.2
The use of recycled concrete is increasing faster than the development of appropriate design recommendations. This paper reports limited experimental data on lap splice performance of reinforced concrete beams with recycled aggregates. Reinforced concrete beams with natural aggregate and recycled aggregate were tested to evaluate their failure modes and lap splice characteristics. Based on the experimental results, reinforced concrete beams with recycled aggregates are about equal strength and failure mode with natural concrete beams.
이영오(Lee Young-Oh),김선우(Kim Sun-Woo),윤현도(Yun Hyun-Do),김규용(Kim Kyu-Young),최경렬(Choi Kuyng-Yuel),강선종(Kang Sun-Jong),김대중(Kim Dae-Jung) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 Vol.9 No.2
The use of recycled concrete is increasing faster than the development of appropriate design recommendations. This paper reports limited experimental data on lap splice performance of reinforced concrete beams with recycled aggregates. Reinforced concrete beams with natural aggregate and recycled aggregate were tested to evaluate their failure modes and lap splice characteristics. Based on the experimental results, reinforced concrete beams with recycled aggregates are about equal strength and failure mode with natural concrete beams.