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비틀대모자반 , Sargassum sagamianum 을 이용한 Pb 및 Cr 생체흡착 및 회수
서근학(Kuen hack Suh),안갑환(Kab Hwan Ahn),이학성(Hack Sung Lee),이회근(Hwae Geon Lee),조진구(Jin Koo Cho),홍용기(Yong Ki Hong) 한국수산과학회 1999 한국수산과학회지 Vol.32 No.4
Biosorption of Pb and Cr to Sargassum sagamianum was evaluated in the various conditions. An adsorption equilibrium was reached in about 15 min. for Pb and Cr. The uptake capacity was 224.5 ㎎ Pb/g biomass and 77.5 ㎎ Cr/g biomass, respectively. The adsorption parameters for Pb and Cr were determined according to Langmuir and Freundlich model. Biosorption of Pb and Cr was increased with an increase in pH value. Pb and Cr adsorbed by S. sagamianum could be recovered by desorption process with 0.1M HCl, 0.1M HNO₃ and 0.1M EDTA and the efficiency of Pb desorption was above 90%, whereas the efficiency of Cr desorption was below 51%.
서근학(Kuen hack Suh),이민규(Min Gyu Lee) 한국수산과학회 1997 한국수산과학회지 Vol.30 No.2
A continuous foam separator has been used to remove TSS, NH₃and NO₂^-from the recirculating water in aquaculture. Experimental runs were carried out to determine the foam separation variables, such as, hydraulic retention time, superficial air velocity and foam height. The removal efficiency of TSS, NH₃and NO₂^- was increased with hydraulic retention time and superficial air velocity, and removal efficiency of NH₃was increased steadily with foam height. As DO concentration was increased with superficial air velocity and foam height, foam separator is also used for oxygen addition. It was concluded that foam separator might offer better perspective for removal of harmful components in fish culture water.
괭생이모자반 , Sargassum horneri 를 이용한 Pb 흡착 및 탈착
서근학(Kuen hack Suh),안갑환(Kab Hwan Ahn),김병진(Byong Jin Kim),조진구(Jin Koo Cho),진형주(Hyung Joo Jin),홍용기(Yong Ki Hong) 한국수산과학회 1999 한국수산과학회지 Vol.32 No.3
Biosorption of Pb to Sargassum horneri was evaluated. An adsorption equilibrium was reached in about 15 min. for Pb und Pb uptake was 185.5 ㎎ Pb/g biomass. When Ca and ㎎ concentration increases in Pb solution, Pb was selectively adsorbed. The Pb adsorbed by S. horneri could be recovered by desorption process, and the desorption efficiency of Pb by 0.1 M HCl, 0.1 M HNO₃, and 0.1 M EDTA was above 95, whereas the elution by 0.1 M NaOH was less efficient in the desorption of Pb. S. horned was reused 6 cycle repeatedly after adsorption/desorption and the sum of uptake was 636.6 ㎎ Pb/g biomass.
알송이 모자반 , Sargassum confusum 을 이용한 Pb 및 Cr 의 생물학적 흡착 및 탈착
서근학(kuen Hack Suh),안갑환(Kab Hwan Ahn),조문철(Moon Chul Cho),조진구(Jin Koo Cho),진형주(Hyung Joo Jin),홍용기(Yong Ki Hong) 한국수산과학회 2001 한국수산과학회지 Vol.34 No.1
우리나라 인근 해역에서 가장 쉽게 채취할 수 있는 해조류 중의 하나인 S. confusum을 이용한 Pb 및 Cr의 생체흡착 실험을 수행 하였다. 두 중금속 모두 흡착 평형에는 15분 안에 도달하였으며, 평형 흡착량은 각각 197.5㎎ Pb/g biomass 및 133.1㎎ Cr/g biomass이었다. Pb 및 Cr의 생물학적 흡착은 Langmuir모델에 더 잘 적용되었다. Pb 흡착시에 Ca가 500m/L 존재하여도 20% 정도 흡착량이 감소하였고, Mg는 Pb 흡착에 전혀 영향을 미치지 않았다. Pb 및 Cr 흡착 후에 0.1 M HCl, 0.1M HNO₃및 0.1 M EDTA를 이용하여 탈착시 Pb의 탈착율은 93% 이상이었으나, Cr의 탈착율은 30% 이하였다. Pb 흡착 후에 0.1M HCl, 0.1 M HNO₃, 0.1 M EDTA 및 0.1 M NaOH를 이용하여 탈착실험을 수행하고 다시 재흡착을 시키는 과정을 6회 반복한 결과 최대 누적 흡착량은 761.4㎎/g biomass였고. HCl 및 HNO₃를 이용한 경우에 Pb의 탈착 및 S. confusum의 재생에 있어 매우 효과적이었다. Biosorption of Pb and Cr by Sargassum confusum was evaluatet at in the various conditions. The uptake capacities for Pb and Cr were 197.5㎎ Pb/g biomass and 133.1㎎ Cr/g biomass, respectively. The adsorption parameters for Pb and Cr were determined according to the Langmuir and Freundlich model. Biosorption of Pb and Cr was increased with the increase of pH value. Pb and Cr adsorbed by S. confusum could be recovered by desorption process with 0.1 M HCl, 0.1 M HNO₃and 0.1 M EDTA. The ratio of Pb desorption was above 93%, whereas the ratio of Cr desorption was below 30%.
서근학(Kuen-Hack Suh),이경범(Gyeongbeom Yi) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.5
This study deals with stockout costs in the supply chain optimization model under the framework of batch-storage network. Stockout is very popular in chemical industries. Estimating stockout cost involves an understanding of customer reactions to a seller being out of stock at the time the customer wants to buy an item. This involves massively non-trivial work such as direct customer interviews and extensive mail survey. In this study, we will introduce a new interpretation of stockout costs combined with batchstorage network optimization model and thus suggest an easy way of estimating stockout costs. Optimization model suggest that optimal process and storage sizes considering stockout cost are smaller than those that do not consider stockout cost. An illustrative example support the analytical results.
수송공정을 고려한 다분기 공정-저장조 망구조의 최적설계
서근학(Kuen-Hack Suh),이경범(Gyeongbeom Yi) 제어로봇시스템학회 2012 제어·로봇·시스템학회 논문지 Vol.18 No.9
The optimal design of batch-storage network by using periodic square wave model provides analytical lot sizing equations for a complex supply chain network characterized as multi-supplier, multi-product, multi-stage, non-serial, multi-customer, cyclic system including recycling and/or remanufacturing. The network structure includes multiple currency flows as well as material flows. The processes are represented by multiple feedstock/product materials with fixed composition which are very suitable for production processes. In this study, transportation processes that carry multiple materials with unknown composition are added and the time frame is changed from single period into multiple periods in order to represent nonperiodic parameter variations. The objective function of the optimization involves minimizing the opportunity costs of annualized capital investments and currency/material inventories minus the benefit to stockholders in the numeraire currency. The expressions for the Kuhn-Tucker conditions of the optimization problem are reduced to a multiperiod subproblem for average flow rates and analytical lot-sizing equations. The multiperiod lot sizing equations are different from single period ones. The effects of corporate income taxes, interest rates and exchange rates are incorporated.