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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.
포말 분리법을 이용한 양어장 순환수 처리 - 2 . 고형물 제거특징 -
서근학(Kuen hack Suh),이민규(Min Gyu Lee),이민수(Min Soo Lee),김병진(Byong Jin Kim),김은정(Eun Jung Kim),조문철(Moon Chul Cho) 한국수산과학회 1997 한국수산과학회지 Vol.30 No.3
The feasibility of foam separation to remove solid produced from fish culture water was investigated. Performance characteristics of foam separator were highly dependent upon the operating parameters which were superficial air velocity, hydraulic retention time (HRT), and foam height. About 50% of the total protein contained in a sample of fish culture water could be removed by foam separator. The removal efficiencies of protein, T-N, TA, and solid components were increased with increasing superficial air velocity and HRT. The combined effects of these operational variables show that removal rates of TVS increase with increasing superficial air velocity and HRT, and decrease as foam height goes up. It could be confirmed that foam separator might offer good perspective for removal of harmful components such as TA and TVS in aquacultural recirculating water.
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.
서근학(Kuen-Hack Suh),이경범(Gyeongbeom Yi) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.3
The aim of this study is to find an analytic solution to the problem of determining the optimal capacity of a batch-storage network to meet demand for finished products in a system undergoing joint random variations of operating time and batch material loss. The superstructure of the plant considered here consists of a network of serially and/or parallel interlinked batch processes and storage units. The production processes transform a set of feedstock materials into another set of products with constant conversion factors. The final product demand flow is susceptible to joint random variations in the cycle time and batch size. The production processes have also joint random variations in cycle time and product quantity. The spoiled materials are treated through regeneration or waste disposal processes. The objective function of the optimization is minimizing the total cost, which is composed of setup and inventory holding costs as well as the capital costs of constructing processes and storage units. A novel production and inventory analysis, the PSW (Periodic Square Wave) model, provides a judicious graphical method to find the upper and lower bounds of random flows. The advantage of this model is that it provides a set of simple analytic solutions while also maintaining a realistic description of the random material flows between processes and storage units; as a consequence of these analytic solutions, the computation burden is significantly reduced. The proposed method has the potential to rapidly provide very useful data on which to base investment decisions during the early plant design stage. It should be of particular use when these decisions must be made in a highly uncertain business environment.