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이준구,김한중,윤성수,최원,이형진,김종옥,정남수,이정재,Lee, Joon-Gu,Kim, Han-Jung,Yoon, Seong-Su,Choi, Won,Lee, Hyung-Jin,Kim, Jong-Ok,Jung, Nam-Su,Lee, Jeong-Jae 한국농공학회 2008 한국농공학회논문집 Vol.50 No.6
An advanced model for assessing life cycle cost of the facility containing several subdivisions has been proposed with systems engineering approach. This model evaluates the maintenance cost in the sphere of the safety as well as in that of its functionality. The proposed approach has been shown to be more reasonable and practical than existing models. The serviceability and reasonability have been proved through evaluating life cycle cost of the reservoir which is a representative agricultural facility. In addition, the proposed method is helpful to make a maintenance strategy using the survival probability in the point of safety and functionality.
이준구,김명원,신태호,Lee, Joon-Gu,Kim, Myong-Won,Shin, Tae-Ho 한국관개배수위원회 2011 한국관개배수논문집 Vol.18 No.2
This study was performed to apply the preventive management technique that is known for more economic and preventive for disaster than corrective technique to Repair & Improvement(R&I) Project policy of irrigational facilities. The appropriate periods of R&I Project had been driven to 40yrs, 24yrs, 27yrs, and 29yrs for reservoir, Pumping and drainage pumping station, Diversion weir and Irrigation & drainage canal respectively. The cost of R&I Project for 10 years had been estimated as 616.9 billion won per year including the 85 billion won for the project of 'Disaster prevention and Function continuity'. After the period of 'Improvement all at once', about 30yrs, 421.8 billion won was requested for 'Function continuity'.
왕겨재를 혼입한 콘크리트의 동결융해 저항성에 관한 실험적 연구
이준구 ( Lee Joon Gu ),박광수 ( Park Kwang Su ),이응찬 ( Lee Eung Chan ),김한중 ( Kim Han Joong ) 한국농공학회 1999 한국농공학회 학술대회초록집 Vol.1999 No.-
After researching the physical properties of the concrete included Rice Husk Ash(RHA concrete) and workability of fresh concrete admixed RHA, we have tested durability of RHA -concrete against freezing and thawing in the winter using rapid freezing and thawing test method(KS F 2456). There are two hypotheses to explain the failure mechanism of a freezing and thawing action. First, the hydraulic pressure in the pores of freezing concrete make an internal stress of concrete structures outbreaking micro crack in the face of concrete. Second, Frost action causing damage to cement paste repeatedly come from soil frost action, freezing water in the capillaries. Initial Relative Dynamic Modulus of Elasticity (DME) was biggest in case of unit binder weight 600kgf/m<sup>3</sup> and relative dynamic modulus of elasticity increased until 300cycles. In general, initial relative DME was proportional to unit binder weight. Relative DME was decreased in proportion to unit binder weight in the case of 300, 400, 500kgf/m<sup>3</sup>, but relative DME of the others remained more than 90% until 300 cycles. It was not good effect of il1termixed RHA to concrete in case of below unit binder weight 300kgf/m<sup>3</sup> and the resistance of freezing and thawing was not good either.
고유동 콘크리트의 거푸집 측압 측정에 관한 실험적 연구
이준구 ( Lee Joon Gu ),박광수 ( Park Kwang Su ),김한중 ( Kim Han Joong ),배수호 ( Bae Su Ho ) 한국농공학회 1998 한국농공학회 학술대회초록집 Vol.1998 No.-
The purpose of this study is to estimate lateral formwork pressure controlled by super-workable fresh concrete using prototype structrues such as, tall wall, retaining wall, and beam quantitativly. As a result of this experiment, a function which can be used to design a formwork system and to predict formwork pressure curve is formulated.
이준구 ( Lee Joon Gu ),박광수 ( Park Kwang Su ),김석열 ( Kim Seog Yol ),장문기 ( Jang Moon Gi ),김한중 ( Kim Han Joong ) 한국농공학회 2000 한국농공학회 학술대회초록집 Vol.2000 No.-
This study was performed to find out how much water the cement hydration reaction need. It is real situation that it is difficult to find out the amount of chemical combined water with stoichiometric chemical reaction form. Because several variation occurred during hydration reaction it's not easy to divide water which used at cement paste mixture. In this study high temperature(105℃) dry method was used to divide evaporable water and non-evaporable water. The last is combined water chemically and some free water absorbed to products of hydration physically. The test was processed with variation of water cement ratio from 10% to 45% with 5% intervals. The weight of cement paste specimens were measured after dry for 72hours at each checking time(0.5, 1, 3, 5, 10, 24, 48, 72, 168hour). In this study some conclusions such as follows were derived. Firstly, Pure combined water contents required at cement hydration result in 23.3percent of the weight of cement. Secondly, The sufficient mixing water needed to fully hydrated cement result in about 40∼45percent of weight of cement. That is, gel pores water could be about 16.7∼21.7percent of weight of cement.
이준구 ( Lee Joon Gu ),조영권 ( Cho Young Kwon ),김한중 ( Kim Han Joung ),김관호 ( Kim Kwan Ho ),김명원 ( Kim Myung Won ) 한국농공학회 2006 한국농공학회 학술대회초록집 Vol.2006 No.-
The main purpose of developing the web-base management system is to give good serviceability and long public usage by managing Saemangeum gate bridge, one of the marine concrete structures effectively with this system. This system was planned to be upgraded with data acquired from several exposure specimens under same environment as structures. Several repair materials and repair construction methods applied to exposure specimens will be tested for its performance of prohibit salt attack and freezing & thawing action during experimental period about ten years. The new one created at each year will be tested by the same proceeds as above and the acquired data will be inputted in D/B. All of these data could be available to complete the prediction module. The manager will be able to use the system for optimal maintenance of the other marine concrete structures also.
이준구 ( Lee Joon Gu ),박광수 ( Park Kwang Soo ),신수균 ( Shin Su Gyun ),김관호 ( Kim Kwan Ho ),김명원 ( Kim Myung Won ),김한중 ( Kim Han Joung ) 한국농공학회 2003 한국농공학회 학술대회초록집 Vol.2003 No.-
This research deriving the lifetime distribution function of embank as one of main components in reservoir was carried out by mining the data of precise safety diagnosis in 1995 to 2001 as one of researches that were performed for determining the propriety for making item at design for planning and considering optimal maintenance strategy for service life through acquiring the system function of reservoir as main resource for irrigation and analyzing the life cycle cost of it.
이준구 ( Lee Joon Gu ),박광수 ( Park Kwang Soo ),신수균 ( Shin Su Gyun ),김관호 ( Kim Kwan Ho ),김한중 ( Kim Han Joung ) 한국농공학회 2002 한국농공학회 학술대회초록집 Vol.2002 No.-
This study was performed to find out the regression function to calculate the modulus of elasticity of concrete mixed by river coarse aggregate. The distribution of the group of core strength made a normal curve and the effect factor in the modulus of elasticity was 0.97 at the concrete compounded by river coarse aggregate.
이준구 ( Lee Joon Gu ),이정재 ( Lee Jung Jae ),박광수 ( Park Kwang Soo ),김한중 ( Kim Han Joung ),윤성수 ( Yoon Sung Su ) 한국농공학회 2004 한국농공학회 학술대회초록집 Vol.2004 No.-
본 연구에서는 여러 부속시설로 이루어진 시설물에 대해 시스템 엔지니어링 접근법을 이용하여 시스템의 생애주기비용 항목 중 유지관리비용을 안전대책확보비용과 기능유지확보비용으로 구분하여 기존의 생애주기비용 산출방법을 좀 더 합리적이고 현실적으로 개선하는 생애주기비용 모델(Advanced life cycle cost; ALCC)을 확립하였으며, 이를 대표 농업시설물인 저수지 시스템에 적용하여 그 유용성을 검증하였고, 개선 전의 함수법보다 개선 후의 함수법이 유지관리 비용을 절감할 수 있음을 확인하였다. 또한, ALCC에서는 시스템의 유지관리에 따른 기능 시스템의 생존확률과 안전 시스템의 생존확률 변화를 시간(사용연한)함수로 나타낼 수 있으므로 시스템별 유지관리 전략을 달리할 수 있었다. An advanced model for assessing life cycle cost of the facility containing several subdivisions has been proposed with systems engineering approach. This model evaluates the maintenance cost in the sphere of the safety as well as in that of its functionality. The proposed approach has been shown to be more reasonable and practical than existing models. The serviceability and reasonability have been proved through evaluating life cycle cost of the reservoir which is a representative agricultural facility. In addition, the proposed method is helpful to make a maintenance strategy using the survival probability in the point of safety and functionality.