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백훈현(Hoon-Hyun Baek),유신원(Shin-Won Ryu),우영찬(Young-Chan Woo),이병인(Byung-In Lee),김봉호(Bong-Ho Kim),백욱현(Wook-Hyun Baek),백수곤 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Power plant piping and pipe support/hanger failures cause forced outages at log time operation power plants. To prevent the power piping and support/hanger, piping systems surveillance program designed to evaluate existing piping installations will be helpful plant managing tools. These piping surveillance program is composed as piping displacement monitoring, Hot and cold walk-downs, hanger/support performance test, piping stress evaluation, etc. In most power plants, piping displacement monitoring devices are installed to each hanger. In this paper, optimization of power plant piping systems using reduced piping displacement monitoring devices are described.
백훈현(Hoon-Hyun Baek),유신원(Shin-Won Ryu),우영찬(Young-Chan Woo),김봉호(Bong-Ho Kim),이병인(Byung-In Lee),백욱현(Wook-Hyun Baek) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
To reduce the maintenance costs and get the economical man power rate regarding the power plant piping valve, flat sealing faces is required for the perfect valve seals. If this area is damaged, the flow control of the power piping systems reaches really hard condition. Finally the plant economics get troubles. For the quick and uncomplicated repair, portable valve grinding and lapping machines was developed. it can be used on site where the valve are located as in-situ. Using portable mechanism - stand-alone stationary machine - it is not necessary to remove the valve from the plant which contributes to an effective reduction in maintenance costs and thus the costs of outages. The machine has the functions, such as quickly change grinding disks and adjusting the grind pressure.
전기로산화슬래그 골재를 사용한 콘크리트의 기초 물성에 관한 실험적 연구
류득현(Ryu Deug-Hyun),김길희(Kim Kil-Hee),박찬규(Park Chan-Gyu),손유신(Son Yu-Shin) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.8
Electric-furnace-slag(EFS) has the expansion, due to the reaction with water and free CaO. So compared with the blast-furnace-slag, the recycling range of EFS is subject to restriction. If the expansive reaction of EFS is removed, it is possible to use aggregate for concrete. This study is the basic properties of concrete used stabilized EFS(oxidized EFS). The EFS is used fine aggregate and coarse aggregate in concrete, and replaced by natural aggregate(sea sand and crushed stone). The replacement ratio are 0%, 25%, 50%, 75%, 100%. The result of study is that, in basic properties of EFS aggregate, the percentage of absorption is lower and the density is higher than natural aggregate. EFS fine aggregate, used in this study, belongs to N type for specific density under oven-dry, based on KS F 4571. And properties of concrete, to used EFS aggregate, the flowability is increased in proportion to replacement ratio of EFS. But the bleeding is also increased as replaced EFS, especially when replaced EFS-fine-aggregate, due to the heavy density of EFS. The properties of strength, compressive strength and tensile strength, are also increased, and the modulus of elasticity is increased. It is necessary the more study, like durabilities, in order to use EFS for concrete' aggregate.
최원도(Wondo Choi),정승철(Seungchul Jung),이인광(Inkwang Lee),유신(Ryu Shin) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
We are making continuous efforts to improve the agreeableness of a car HVAC system. As interior noise level of the car is improved and the requirement of the customer is enlarged, the Sound Quality improvement has been desired more. In this research we understood the influence of the factors at the HAVC SYSTEM on the sound pressure level and the sound quality by the use of Taguchi Method. We could enhance the sound quality through improvement of the main factors.