• Proceedings of the Membrane Society of Korea Conference
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• 한국막학회 2005년도 추계 총회 및 학술발표회
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• pp.196-199
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• 2005

원자력 고온가스의 열물 이용하여 수소를 생산을 하는 IS(Iodine-Sulfur)공정 중 HI분해-분리반응은 높은 열적-화학적 안정성이 요구되는 공정이다. 이러한 공정분위기에서 사용 될 분리막반응기의 촉매를 선정하고자 다양한 담체내에 백금(Platinum)의 함유량이 각각 다른 촉매를 사용하였다. HI 분해실험온도는 $300-500^{\circ}C$ 의 범위이며 일정량의 HI 용액을 기화시켜 촉매반응기에 정량적으로 공급하여, 가스크로마토그래피를 이용하여 분석하였다. 분해온도 변화와 다양한 담체내백금의 함유량 변화에 따른 HI전환율 확인하였으며, 반응 후 촉매에 대한 SEM과 XRD분석의 수행으로 촉매의 내구성과 변화를 확인하였다.

• Proceedings of the Korean Information Science Society Conference
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• 한국정보과학회 2006년도 가을 학술발표논문집 Vol.33 No.2 (A)
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• pp.563-567
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• 2006

현재 IT분야의 끊임없는 발전과 더불어 BT/NT 분야와의 협업이 활발히 진행되고 있는 가운데, 광학 이성질체에 대한 연구는 그 중요성이 점점 증가되고 있다. 광학 이성질체는 생체 내에서 작용할 경우 성질, 기능, 효과에서 정반대 결과를 일으키기에 제약 산업 등 응용분야에서는 사용을 위해 효과적으로 식별하여 분리할 필요성이 존재한다. 이런 실험은 단계가 복잡하고 결과를 분석하고 시각화하기 어렵다. 이를 해결하기 위해 본 논문에서는 광학 이성질체의 분리연구를 위한 그리드 기반의 Chiral-MGrid 시스템을 제공한다. Chiral-MGrid 시스템은 분리연구 관련 실험을 그리드 기반에서 one set operation으로 수행할 수 있는 서비스를 제공한다.

• Proceedings of the Korean Nuclear Society Conference
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• 한국원자력학회 1997년도 춘계학술발표회논문집(2)
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• pp.345-349
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• 1997

고준위 방사성 액체폐기물에서 얻어지는 백금족 금속(Pd, Rh, Ru) 들의 분리 및 정제방법으로 강염기성 음이온교환수지를 사용하여본 결과 상용 수지중에서 Dowex 1 $\times$ 8 이 IRN-78 에 비하여 저 농도의 질산 농도에서 Pd(II) 의 분리 및 정제시 우수한 흡착성을 보여 주었으며 Rh(III) 의 흡착은 Pd(II) 의 것보다 훨씬 낮은 값을 보여 주었다. 이 수지들의 백금족 금속에 대한 흡착성을 문헌에 보고된 실험 결과들과 비교 검토하여 본 바 이온 그룹으로 3급 및 4급 Benzimidazole을 가지는 수지에 비하여 훨씬 낮은 값을 나타내었다. 따라서 실용성이 큰 강염기성 음이온수지로서는 Benzimidazole과 같은 혼합 아민 그룹을 지닌 수지가 가장 접합할 것으로 전망되었다.

• Aerospace Engineering and Technology
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• 제6권2호
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• pp.8-13
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• 2007

Improvement of the maintenance of firefly is another important part of the electrical system design with the performance. Usually, the maintenance of electrical system for small aircraft is more difficult than the maintenance of engine. The firefly electrical system imports the concept of module for design. In concept of module, sub-module can re easily isolated each other. Therefore, the maintenance of sub-module is possible. In this paper, the design and production of firefly electrical system is described.

• Korean journal of applied entomology
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• 제23권1호
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• pp.1-6
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• 1984

This study was conducted to investigate the incidence of bacterial leaf blight (BLB) in Milyang 30 which was previously considered to be resistant to Xanthomonas campestris pv. oryzae Seeds of Milyang 30 were collected from Suweon, Milyang and Haenam. When rice plants from different source were inoculated at the maximum tillering stage and flag leaf stage, reactions of Milyang 30 were consistant. The susceptibility of Milyang 30 was found to be due to infection with tome isolates in the pathotype II of X. campestris pv. oryzae.

• The Korean Journal of Mycology
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• 제41권2호
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• pp.67-73
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• 2013

Microbial diversity of soil samples from ancient stone-lined tombs was investigated. The tombs, discovered at Eoryung Ocheon-Ri site, Korea, were estimated to be belonged to middle class people from an ancient country, Gaya, which existed till AD 559 at the southern part of Korea. Nine fungal stains and 70 bacterial strains were isolated from the twelve soil samples, which were collected from the tomb Nos. 5 and 6. Ribosomal DNA sequence analysis discovered 5 fungal and 22 bacterial strains belonged to 10 genus groups from the tomb No. 5 while 1 fungal and 28 bacterial strains belonged to 6 genus from the tomb No. 6. The higher microbial diversity suggests that the tomb No. 5 was constructed warmer season than the tomb No. 6. Moreover, the discovery of Staphylococcus warneri, which is found as part of the skin flora on human and animals, and Bacillus aquimaris, which is a marine bacterium and can be discovered from tidal flat, from the surface of large dagger suggests that the ancient people may use meat and seafood at the burial ceremony.

• Journal of the Korean Society of Propulsion Engineers
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• 제13권3호
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• pp.41-49
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• 2009

The present paper describes a mathematical modeling and simulation of the separation of a solid rocket booster from an air breathing engine vehicle. The vehicle and booster are considered as a multi-connected body and the booster is assumed to move only along the axial direction of the vehicle. The dynamic motion of the vehicle and the booster were modeled by using Kane's method. The aerodynamic forces on the whole system along various positions of booster were calculated by using DATCOM software and the internal pressure force acting on the effective surface during separation was simply calculated with gas dynamics and Taylor MacColl equation. Numerical simulation was done by using Mathworks-Matlab. From the result, the variation of Mach number and angle of attack are not large during the separation, so the variation of pitch angle and the characteristics of inlet flow for varying the Mach number and angle of attack during the separation test can be identified as neglectable values.

• Journal of Food Hygiene and Safety
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• 제8권1호
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• pp.55-61
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• 1993

Soil samples and the intestinal contents of arthropods, mollusca, pisces, aves, and mammals were examined for the presence of Clostridium botulinum. Demonstration of Clostridium botulimun was accomplished by identifying its toxin in liquid cultures inoculated with soil or material from the alimentary tract of tested animals with toxin neutralization tests in addition to morphological, cultural and biochemical tests. Incidences of Clostridium botulinum in tested samples were 5.0% in soil, 6.7% in mammal and 8.7% in fish, respectively. All of the positive cultures were identified as Clostridium botulinum type E and any other type was not demonstrated throughout the survey. Canned foods and solid ham/sausage mixture formulated as can with distilled water were inoculated with Clostridium botulinum type E and checked for toxin production by using the mouse bioassay. Clostridium botulinum type E toxin was produced as a large quantity in canned foods of fish, shell, meat and ham and, however, no significant toxin was detected in sausages and fruit samples.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2007년도 춘계학술대회
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• pp.101-104
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• 2007

Mechanical behavior in metal bipolar plate of a fuel cell stack was studied using finite element analysis. The fuel stack is essentially composed of a metal bipolar plate (metal BP), a gasket, an end plate, a membrane electrolyte assembly (MEA), and a gas diffusion layer (GDL). It is important to maintain a suitable fastening force of Metal BP, because it influences the power efficiency of the fuel cell stack. After a gasket and a GDL are placed on the metal BP, the reaction force with the displacement is measured. The channel of metal bipolar plate is replaced by a simple geometrical plate. The results of FEM are similar to those of experiment. Therefore mechanical behavior in metal BP of a fuel cell stack can be estimated by using FEM.

• KSBB Journal
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• 제16권6호
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• pp.533-537
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• 2001

${\alpha}$-lactalbumin and ${\beta}$-lactoglobulin in whey proteins were separated by high performance membrane chromatography (HPMC). The separation mechanism involved anion-exchange, and the stationary phase was anion CIM (Convective Interaction Media) DEAE, QA disk and cation exchanger SO$_3$(16${\times}$3 mm). Two types of mobile phase were used, buffer A (20 mM Tris-HCI, pH 7.3) and buffer B(buffer A + 1 M NaCl), As the amount of NaCl dissolved in buffer linearly increased, which enabled a gradient elution mode. The optimum mobile phase and operating condition (Buffer A/Buffer B = 100/0 - 30/70 vol%, gradient time 1 min, 30/70 - 10/90 vol.%, gradient time 2 min) were experimentally determined. In this experimental condition, ${\alpha}$-lacta1bumin, ${\beta}$-lactoglobulin were separated within 5 min at a mobile phase flow rate of 4 mL/min.