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콘크리트의 압축강도 추정을 위한 비파괴시험식에 관한 연구
권영진,오상근,김무한,Kwon, Young-Jin,Oh, Sang-Kun,Kim, Moo-Han 한국구조물진단유지관리공학회 1997 한국구조물진단유지관리공학회 논문집 Vol.1 No.1
The major object of this study is to analyze and investigate experimentally the experimenal equation for the estimate of compressive strength of concrete. The results are as follows. The relation between maturity scaled logarithm and compressive strength of concrete can be expressed in liner equation which show an good correlation. And combined method using rebound number, pulse velocity and water cement ratio also show an excellent correlation. The equation by combined method is same as the conclusions.
증점제를 사용한 고유동콘크리트의 건조수축 및 중성화에 관한 연구
권영진,Kwon, Young-Jin 한국건축시공학회 2003 한국건축시공학회지 Vol.3 No.3
This study investigated about several mix factors came up to drying shrinkage and carbonation of high flowing concrete using viscosity. The results are as follows; Drying shrinkage ratio of high flowing concrete using viscosity showed higher for early age, but lower than normal concrete as long age. Also, drying shrinkage ratio and reduction ratio of mass showed higher and relative dynamic modulus of elasticty showed lower as W/C was higher generally. And in case of high flowing concrete using viscosity, carbonation wasn't confirmed without the kinds of cement and viscosity except 50C.
혼화재 종류 및 치환율에 따른 고강도콘크리트의 중성화와 건조수축에 관한 실험적 연구
권영진,Kwon, Young-Jin 한국건축시공학회 2003 한국건축시공학회지 Vol.3 No.3
Carbonation and drying shrinkage are very important properties of concrete, that can cause concrete to lower its capacity and spall. But the research on them in high strength concrete is very poor. In this study, to estimate influences of W/B, the kind of admixture, the replacement ratio of admixture, fineness of blast furnace and etc. on drying shrinkage and carbonation, we make experiment with 3 levels(28, 35, 55%) of W/B, 3 kinds(blast-furnace slag, fly-ash, silica-fume) of admixture, 3 levels of the replacement ratio, 3 levels(4000, 6000, 8000cm2/g) of fineness of blast-furnace slag and 2 kinds of curing condition. As the results, compressive strength of concrete was decreased, as W/C was increased and the replacement ratio of admixture was increased. Drying shrinkage was increased, as W/B was higher, the replacement ratio of admixture was increased and fineness of blast-furnace slag was decreased. And carbonation was increased, as W/B ratio was higher, the replacement ratio of admixture was increased.
고강도콘크리트의 내구성진단을 위한 영향인자 파악을 위한 연구
권영진,김무한,Kwon, Young-Jin,Kim, Moo-Han 한국구조물진단유지관리공학회 1997 한국구조물진단유지관리공학회 논문집 Vol.1 No.2
The effect of experimental factors on the Freeze-Thaw durability in the High Strength Concrete has been analyzed and investigated with [DESIGN of EXPERIMENT: L16). The Experimental parameters included the type of aggregate and mixer, the conditions of aggregates, and the difference of mixing temperature, procedure and placing, etc. It is aim of this study to provide the fundamental data on the effect of various factors on the frost resistance of high strength concrete for the practical use and research data accumulation of durability inspection. The results of this experiment indicate that the freeze-thaw durability of high strength concrete is markedly affected by the coarse aggregate source, mixing temperature and curing conditions.
고로슬래그미분말을 사용한 고유동콘크리트의 시공을 위한 내동해성의 평가
권영진 ( Young Jin Kwon ) 한국건축시공학회 2001 한국건축시공학회 학술발표대회 논문집 Vol.1 No.1
Recently,lots of studies for high flowing concrete have been suggested under practical use that it is only a way to solve the confronted problem.However,most studies have been concentrated on the manufacture method and properties of fresh concrete,but there is few studies for the durability of hardened concrete,speacially for the freezing and thawig.Therefore this study is to investigate for the resistance of high-flowing concrete using finely ground granulated furnace blast slag to frost with experimental parameters,such as binder,ratio of replacement of granulated furnace blast slag,superlasticizer,curing method and blain surface area of granulated furnace blast slag.
權寧珍(Young-Jin Kwon),姜相熙(Sang-Hee Kang) 대한전기학회 2007 전기학회논문지 Vol.56 No.5
A wind farm consists of many wind generator(WG)s therefore, it is generally a complex power system. A wind farm as a distributed generation(DG) affects utility power system. If a conventional protection schemes are applied, it is difficult to detect faults correctly and the schemes can't provide proper coordination in some cases. This paper presents a protection algorithm for a wind farm which consists of a looped collection circuit. Because the proposed algorithm can distinguish between an internal fault and an external fault in a wind farm, The proposed algorithm can disconnect the faulted section in a wind farm. This algorithm is based on an overcurrent protection technique with the change of the ratio of the output current of a generator to the current of the looped line connected to each generator to collect the each generator's power. In addition, operating time of the algorithm is shortened by using the voltage drop at a generator collection point. The performance of the proposed algorithm was verified under various fault conditions using PSCAD/EMTDC simulations.