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콘크리트 교면포장 균열 보수를 위한 하이브리드 에폭시 박층포장 보수공법 개발에 관한 실험적 연구
김한솔 ( Kim Han-sol ),김영관 ( Jang Jong-min ),이한승 ( Lee Han-seung ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.2
A method for repairing cracks using low-viscosity resins has been proposed as a construction method that can quickly repair roads from deterioration. However, when the viscosity of the epoxy resin is high, there is a limit in that it is difficult for the material to penetrate into microcracks and cracks in the concrete top plate. In this study, an epoxy thin-layer pavement repair method was developed using low-viscosity PMMA (Poly methyl methacrylate) to repair microcracks on the pavement surface and pavement layer and reinforce the pavement surface. Materials necessary for the thin-layer packaging method were developed, and performance was evaluated to meet the epoxy binder quality standards. As a result, all materials met the required performance.
김종한(Kim Jong-Han),박섭(Park Sub),박영구(Park Young-Goo) 한국지역사회학회 2006 지역사회연구 Vol.14 No.3
The first purpose of this article is to analyze the changes of population and worker's condition in Busan before and after period of Korean war. The second purpose is to analyze the relation with Korean war and Seoul-Busan growth axis under this changes. The result of this study is can be summarized as follows. First, during the war, Busan's population increased rapidly and strengthened Busan's ecnomic power. But this is not necessarily means the strengthening of Seoul-Busan growth axis. second, although the war intensified Busan's economic power, it was not means the improvement of worker's condition in Busan. Ultimately, the results of this study suggest the possibility of an aggravation of Busan worker's condition after the war (1950's)
김진,김종한,김남권,임규상,Kim, Jin,Kim, Jong-han,Kim, Nam-Kwen,Lim, Gyu-sang 대한한방안이비인후피부과학회 1998 한방안이비인후피부과학회지 Vol.11 No.1
The aim of this study was to investigate the effects of Chungdaesan(CDS) by various administration routes on skin anaphylactic reaction. The most classic and popular skin reaction in vivo is passive cutaneous anaphylaxis(PCA) In this study, therefore, the author investigated the effect of CDS on PCA reaction activated by anti-dinitrophenyl immunoglobulin E antibody The results showed that CDS potently suppressed orally, topically, intraperitoneally, and intradermally administered. However, it did not show suppressive activity when intravenously administered. In addition CDS significantly inhibited anti-DNP IgE induced mast degranulation in mice skin. Moreover, CDS suppressed anaphylactic histamine release from mast cells induced by anti-dinitrophenyl immunoglobulin E antibody. These results indicate that CDS suppresses the PCA reaction by stabilization of mast cells in vivo and in vitro am] also suggest that the differential activity following administration routes may be caused by the difference of bioavailability.
혼화재와 혼화제의 조합에 따른 콘크리트의 응결 및 압축강도 특성
김종(Kim Jong),송승헌(Song Seung Heon),전충근(Jeon Chung Keun),한민철(Han Min Cheol),신동안(Shin Dong-An),한천구(Han Cheon-Goo) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
Present paper is to investigate the setting and strength properties of concrete incorporating mineral and chemical admixtures to reduce hydration heat of mass concreting According to test results, combination of mineral and chemical admixtures resulted In an acceleration of setting time of concrete using early strength development type AE water reducing agent(ESAEWRA) by as much as 30 minutes compared With that using standard type AE water reducing agent Use of retarding type AE water reducing agent and fly ash 30, 60% led to retard the setting tune by as much as 4-7,5 hours Use of super retarding agent retarded much more by as much as 45-28 hours For compressive strength, combination of ESAEWRA and CKD 10% had larger strength by as much as 5MPa at 3days compared with that of standard type AE water reducing agent concrete Use of super retarding agent led to reduced early strength while at 28 days it maintained similar strength development
Experimental Study on Behavior Characteristics in Crankshaft Oil Seal
Han Goo Kim(김한구),Sae-il Jeon(전세일),Myung Koo Kim(김명구),Akio Nakamura,Se Jong Yoo(유세종),Mun-Ha Lee(이문하),Myoung-Hun Oh(오명훈),Jung-Kyou Kim(김정규) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The behavior characteristics of the gasoline engine crankshaft oil seal regarding the assembling condition are being experimentally studied. Normally, most of the crankshaft oil seals are assembled onto the housing which is created after the cylinder block and the oil pan are assembled. Since the cylinder block and the oil pan are separate parts, mismatching quantity presence cannot be avoided which has influence on the crankshaft oil seal behavior characteristics. Thus, experimental study has been taken place for the leakage characteristic and the friction torque value change according to the mismatching amount variance and the engine oil temperature with the shaft velocities. The result shows that when the rotating shafts velocity is constant, leakage was present when it was over 0.6 ㎜ and friction torque increases proportional to the mismatching amount. From the experimental study, it was relevant that the assembling condition of the cylinder block and the oil pan has effects on the behavior characteristics for the crankshaft oil seal.