• Proceedings of the Korean Society of Precision Engineering Conference
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• 1994.10a
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• pp.806-811
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• 1994

최근의 절삭가공 생산시스템은 무인자동화,고속화,정밀화로 대별되면서 생산성을 극대화시킬려는 방향으로 연구 가 진행되고 있다. 종래의 CNC화된 기계가공시스템에서는 절삭속도,이송속도 그리고 절삭깊이 등과 같은 절삭 조건은 On-line으로 조절되는 장치를 갖지 않고 Off-line으로 프로그래머의 경험이나 절삭가공의 데이터 핸드북을 통하여 결정되어진다. 이러한 절삭조건은 절삭률 즉 생산성의 측면에서 최적의 값이 될 수가 없다. 이는 프로그래머가 측면에서 최적의 값이 될 수가 없다. 이는 프로그래머가 공구의 마모나 표면거칠기, 또는 공작기계의 부하 등을 고려하여 극적으로 NC프로그램을 짜기 때문이다. 이러한 문제점 때문에 현재 개발되어지고 있는 대부분의 적응제어시스템은 실용화가 되지못하고 있는 실정이어서 효휼적인 적응시스템의 개발은 필수적이다. 따라서 본 연구에서는 무인자동화 가공시스템에서 생산성을 최대화하기 위하여 사용하는 ACO 시스템에서 발생하는 상기의 문제를 해결하여 실용화할 수 있는 가공 최적화 시스템을 개발함을 연구의 목적으로 하고 있다.

• Applied Biological Chemistry
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• v.39 no.6
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• pp.449-454
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• 1996

We investigated the optimal condition for the production of extracellular pretense(a cuticle-degrading pretense) from entomopathogenic fungus Beauveria bassiana(ATCC7159) in liquid medium by adding of gelatin, bovine serum albumin(BSA), casein and polypeptone. The optimal induction medium for production of extracellular pretenses is composed of 0.5% polypeptone, trace elements and 50 mM potassium phosphate(pH 6.0). In this condition, the production of extracellular pretenses increased rapidly after the 24hrs, peaking at the third day and there was little inductive effect in culture broth more than pH 7.0. The pretenses were inhibited by phenyl methyl sulfonyl fluoride(PMSF). High activity of pretense was showed both range of pH 8.5 and 11.5 and also detected by three different portions of slice gel derived from non-denaturing isoelectricfocusing gel. At least three different extracellular pretenses are produced in optimal production medium when polypeptone is used as the sole carbon and nitrogen source.

• Journal of the Korean Society of Food Science and Nutrition
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• v.32 no.7
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• pp.976-980
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• 2003

A strain of potential producer of fibrinolytic enzyme was isolated from Korean fermented food. The isolated bacterium was identified and named as Bacillus brevis KJ-23. The optimal condition of the medium for the production of fibrinolytic enzyme from Bacillus brevis KJ-23 was nutrient broth with 0.5% D-ribose, 0.5% malt extract and 0.3% $K_2$HPO$_4$. The optimum pH, temperature and fermentation time for the enzyme production were pH 7.0, 3$0^{\circ}C$ and 24 hr, respectively.

• Microbiology and Biotechnology Letters
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• v.26 no.3
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• pp.244-249
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• 1998

An extracellular polysaccharide, methylan, was produced under the specific conditions by Methylobacterium organophilum from methanol. The specific growth rate of cells was approximately constant regardless of C/N ratio and the specific product yield was maximum at a C/N ratio of 30. Methylan production was suppressed by the deficiency of mineral ions such as Mn$^{++}$ or Fe$^{++}$ ion. The optimal pH for cell growth and methylan production was 7. Whereas the optimal temperature for cell growth was found to be 37$^{\circ}C$, that for methylan production was 3$0^{\circ}C$. The methanol concentration above 4% completely inhibited the cell growth. The initial methanol concentration for the maximal production of methylan was 0.5% (v/v) and above this concentration, methylan production was markedly inhibited. To overcome the substrate toxicity and inhibition for both cell growth and methylan production, a fed-bach culture of intermittent feeding within 5 g/l methanol was conducted under the optimal culture condition. Methylan production of was stimulated by nitrogen limitation and methylan was accumulated up to 8.7 g/1 and cell mass also increased up to 12.4 g/l.

• Proceedings of the KSEEG Conference
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• 2001.04a
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• pp.271-274
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• 2001

• Proceedings of the Korean Society of Life Science Conference
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• 2003.10a
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• pp.97-97
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• 2003

• Applied Biological Chemistry
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• v.50 no.1
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• pp.1-5
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• 2007

For the purpose of application for biomass of Pleurotus eryngii, the optimum culture condition were tested. It was found that the optimum culture condition for spot culture of pleurotus eryngii were 24$^{\circ}C$ for 18 days with PDA medium. And the optimum culture condition of bioreactor for biomass were pH 5.5, 18$^{\circ}C$ and 27 days with PDMP broth. It was possible to artificial cultivation of mycelial from Pleurotus eryngii using bioreactor for biomass under the optimum conditions, and it was also possible for Pleurotus eryngii biomass because the forming of fruiting body when Pleurotus eryngii was cultivated using mass artificial cultivated mycelial in the bioreactor.

• Korean Chemical Engineering Research
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• v.47 no.2
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• pp.157-162
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• 2009

In this paper, the density, viscosity and solubility are measured to know the physical properties of dye. By changing the concentration of dye solution, the density change of the dye solution was very small and the viscosity of the dye solution was increased. Also, by changing the temperature of dye solution, the density change of the dye solution was increased but the viscosity of the dye solution was decreased. Solubility of dye conducts under the changing the salt and concentration of dye. In 20 wt% of dye and 15 wt% KCl, the amount of dye crystal is maximal. Also, batch salting-out experiments were performed with various conditions to know the optimal operating conditions of dye crystal. Under the various experiments, optimal operating condition was found based on amount of dye; added 15 wt% KCl, $25^{\circ}C$ temperature, 100 RPM, added at once.

• Journal of Energy Engineering
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• v.24 no.4
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• pp.1-10
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• 2015

For successful operation of waterflooding which is one of secondary recovery methods, suitable water injection allocation is important to increase oil recovery. Well allocation factor(WAF) which is one way to quantify the injector and producer connectivity, is utilized to allocate water injection of waterflooding. Static WAF cannot represent the field condition and can induce incorrect value. To compensate for limitation of static WAF, modified WAF which includes several parameters that affect patterns including well radius, distance between wells, and injection rates is proposed. In this study, static and modified WAFs were applied to injection optimization of waterflooding and results by each WAF were compared. In case of modified WAFs, produced water were less and produced oil were more than case of static WAF especially in big change of distance between producer and injector. Therefore, modified WAFs can allocate water injection more efficiently than static WAF.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2003.05a
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• pp.1171-1178
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• 2003

국내신발업체들의 생산시스템은 탄력성이 부족하고 표준화가 미흡하여 자동화, 정보화 등을 매우 어렵게 하고 있다. 특히 OEM 생산에 의존하는 중소신발생산기업들은 OEM의 특성상 촉박한 일정에 쫓기게 되어 생산계획 및 공정조건 둥을 최적으로 설정하지 못하고 과거의 경험 둥에 의해 단기적이고 즉흥적으로 설정하고 있다. 이러한 형태는 중소신발생산기업들의 생산성 저하와 손실 초래의 중요한 원인이 되고 있다. 본 연구에서는 신발공정의 효율 및 생산성을 극대화하기 위해 중소신발생산기업의 생산시스템에 기반을 둔 시뮬레이션 모형을 개발한다. 이를 이용하여 현재의 생산공정 및 관리시스템에 대한 여러 가지 문제점 및 비효율적 요소들을 파악하고, 그에 따른 최적의 개선대안들을 도출하고 제시한다.