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Jae-Koo Kim(김재구),Eunae Kang(강은애),Kang Moo Huh(허강무) 한국고분자학회 2019 폴리머 Vol.43 No.5
프탈레이트 에스터계 가소제는 폴리염화비닐(PVC) 소재의 유연성과 가공성을 향상시키기 위해 광범위하게 사용되어 왔다. 그러나 인체 및 환경에 대한 유해성 논란으로 인해 사용이 규제되고 있으며, 친환경적이며 PVC 소재와의 가공성이 우수한 비프탈레이트계 가소제로의 대체가 증가하는 추세이다. 본 연구에서는 친환경적 가소제 개발을 위해 코코넛 오일 기반의 바이오 가소제를 생물학적 전환 공정에 의해 합성하였다. 합성된 가소제가 PVC 소재의 가공성 측면에서 유변학적 및 용융학적 특성에 미치는 영향을 상용 프탈레이트 가소제와 비교하였고, 기계적 및 열적 특성과의 상관관계에 대한 예측 모델을 제안하였다. Phthalate esters have been extensively used as plasticizers to improve the flexibility and processability of poly(vinyl chloride) (PVC) resin. However, the use of phthalate plasticizers is prohibited, and they have been replaced by non-phthalates due to the controversy over their harmful effects on the human body and the environment. Therefore, in this paper, a coconut oil-based bio-plasticizer (COBP) was synthesized via bioconversion of coconut oil using an enzyme catalyst. The rheological and fusion effects of the COBP on the PVC resin were compared with the effects of commercially available phthalate plasticizers in terms of processability, and a predictive model for correlating the mechanical and thermal properties was suggested.
김재구 ( Jae Koo Kim ),윤갑식 ( Kap Sik Yun ) 한국경제지리학회 2010 한국경제지리학회지 Vol.13 No.3
The study aims to estimate interregional trade coefficient of service industry using the gravity model. The gravity model has been widely used for prediction of the level of human interaction between two regions which is positively related to attraction of them and negatively related to the distance between them. To apply the gravity model for explaining the interregional trade flow of service industry, the choice of proper proxy variables which represent a dependent variable and independent variables is most important. However, the literature shows that there are few studies on this issue. Four models concerned to the choice of proxy variables are considered. Finally, this paper employs the least-squares regression analysis to test the model`s goodness-of-fit, and suggests the most appropriate model based on the result from the analysis. The result shows that the interregional trade of service industry in regional input-output table developed by The Bank of Korea is desirable as a dependent variable, the service industry output of export region, the population of import region, and the spatial distance between regions are desirable as independent variables
Jae-Koo Kim(김재구),Kang Moo Huh(허강무) 한국고분자학회 2021 폴리머 Vol.45 No.3
바이오매스의 일종인 폐식물유는 대부분 주거 및 상업 부문에서 대량으로 생성되며, 재활용률이 낮은 자원이다. 폐식물유는 환경에 대한 관심이 고조되고 석유화학 자원의 고갈에 따라 재생가능한 자원으로서 지대한 관심을 받아오고 있다. 본 연구에서는 바이오매스 기반의 폐식물유를 재활용하여 고내열성 및 고강도 특성이 우수한 반응형 가소제(BmBP)를 기존의 7단계 에폭시화 반응 공정을 혁신적으로 단순화한 3단계 공정을 통해 합성하였다. 합성된 가소제는 대응하는 특수 가소제인 TINTM 및 DIDP와 가공성 측면에서 상대 비교를 하였다. Waste vegetable cooking oil (WVCO), a type of biomass, is primarily produced in large quantities within the residential and commercial sectors and is a resource with low recycling rate. WVCO has been receiving much attention as a renewable resource due to rising environmental concerns and the depletion of petrochemical resources. In this study, reactive plasticizer (BmBP) recycled with biomass-based WVCO was synthesized via a three-step process that was innovatively simplified from the conventional seven-step epoxidation process, which has high heat resistance and high strength. The synthesized BmBP was compared with corresponding specialty plasticizers, such as TINTM and DIDP, in terms of processability.
조성법과 Markov Chain 모형을 결합한 지역 인구예측모형에 관한 연구
김홍배(Kim Hong-Bae),김재구(Kim Jae-Koo),임병철(Lim Byung-Chul) 대한국토·도시계획학회 2009 國土計劃 Vol.44 No.6
Population of a city is a leading indicator in urban planning. Because sizes of various infrastructure including housings, streets and facilities related to urban services are mostly determined according to the population of a target year. Hence, an inaccurate forecasting of population will result in inefficient resource allocation within a city. However, there is usually a considerable difference between a forecasted population and the actual population. The study attempts to develop a more accurate population forecasting model. specifically, In the model the cohort-component method is used for natural growth and the Markov chain model for migration. Also, To enhance the accuracy of the stationary Markov chain model, the study adopts the non-stationary model by adding migration factors including the housing developments and the distance between the move-in and the move-out city. The study specifically shows that the model developed reduces the difference between forecasting and actual population. Also, using the model the policy scenarios on balanced development are examined.
도시 내 탄소발생량 산정과 저탄소도시 개발의 핵심부문에 관한 연구
김홍배(Kim Hong-Bae),김재구(Kim Jae-Koo) 대한국토·도시계획학회 2010 國土計劃 Vol.45 No.1
This paper attempts to suggest the method for calculating carbon dioxide(C02) emissions and to identify key sectors for low-carbon city. The CO2 emissions mechanism in the city consists of various emission sectors including industry, transport, house and waste sectors. On the other hand there is an CO2 absorption sector, so-called sink sector of forests and green area. The paper presents a model specifically to calculate CO2 emitted in the city level taking into consideration those emission and absorption sectors. Also, the paper draws key elements of low-carbon city from results of sensitivity analysis. In addition, development scenarios of low-carbon city are suggested and analyzed using the model. Finally, the paper proposes the development strategy direction for low-carbon city.