• Fire Science and Engineering
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• v.18 no.4
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• pp.64-71
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• 2004

This paper describes the result of the pump room fire analysis of the nuclear power plant using CFAST fire modeling code developed by NIST. The sensitivity studies are performed over the input parameters of CFAST: the constrained or unconstrained fire, Lower Oxygen Limit (LOL), Radiative Fraction (RF), and the opening ratio of the fire doors. According to the results, a pump room fire is the ventilation-controlled fire, so it is adequate that the value of LOL is 10% which is also the default value. It is anlayzed that the Radiative Fraction does not affect the temperature of the upper gas layer. It is appeared that the integrity of the cable located at the upper layer is maintained except for the safety pump at the fire area and the Conditional Core Damage Probability (CCDP) is 9.25E-07. It seems that CCDP result is more realistic and less uncertain than that of Fire Hazard Analysis (FHA).

• Journal of Sericultural and Entomological Science
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• v.36 no.2
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• pp.130-137
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• 1994

This experiment was conducted to evaluate the reasonable rearing technique of Japanese oak silkworm under the different rearing condition as environment, feeding materials and rearing methods. The results are summerized as follows. The optimum temperature for the indoor rearing of Japanese oak silkworm was 25~26$^{\circ}C$ a in young silkworm and 22~23$^{\circ}C$ in grown silkworm, and generally in the condition of variable day/night temperature the growth of silkworm was faster than in that of constant temperature. The optimum relative humidity for it's growth was 80~90% at young silkworm stage and 60~70% at grown silkworm stage. The photoperiod was not affected to the growth of Japanese oak silkworm. The earlier brushing, the shorter the young silkworm stage, and the cocoon quality improved compared to the later brushing time. As a feeding materials aok (Auercus acutissima Crruthers) leaves were better than those of chestnut tree (Castanea Crenata Siebold & Zuccarini) and feeding value of cultivated oak tree leaves was better than that of natural oak tree leaves. The moving time when revealed the better cocoon production of Japanese oak silkworm from indoor condition to outdoor was 15 days after hatched, and the cocoon production was decreased by the earlier moving to outdoor.

• The Korean Journal of Mycology
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• v.15 no.1
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• pp.23-28
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• 1987

Physicochemical factors influencing the $11{\alpha}$, hydroxylation of progesterone by Rhizopus nigricans Ehrenberg were studied. The higher is the concentration of progesterone. the shorter time is need to attain maximum yield in the $11{\alpha}-hydroxyprogesterone$. High concentration in progesterone was supposed to inhibit the hydroxylation reaction of the $11{\alpha}-hydroxyprogesterone$. The range of optimum pH and temperature appeared to be rather broad and these conditions were similar to those of optimum growth of the mycelia. Agitation at a higher speed than a certain limit, and the presence of sugars accelerated the $11{\alpha}-hydroxyprogesterone$ reaction. Glucose was found to be more effective for the reaction using spores rather than mycelia as enzyme sources. Organic solvents were proved to supress the enzyme activity, which decreased with increase in the concentration of the organic solvents and in the time for pretreatment with the solvents.

• Journal of the Korean Society of Food Science and Nutrition
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• v.32 no.5
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• pp.695-699
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• 2003

Traditional soybean sprouting bucket has some problems which are putrefaction and growing inhibition by the high temperature and carbon dioxide in the bucket during culturing. To solve this problems we developed the new soybean sprouting bucket. The new bucket consisted a square shaped bottom which has 5 draining holes (each 10 mm in dia, 2 mm in height) and four side wall which has two rectangular shaped holes (10 cm long, 0.5 cm wide), and the support vessel which 592 tiny draining holes whose center attached a pipe with 36 small holes (each 2 mm in dia). The new one showed lower temperature and carbon dioxide content during culturing, and the putrefaction was lower, whereas growing degree was higher during culturing at 25$\pm$1$^{\circ}C$ than the traditional bucket.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.23 no.1
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• pp.169-175
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• 2009

In this experiment molybdeum oxide($MoO_3$) films were prepared by a magnetic null discharge(MND) sputtering system and fundamental properties by XRD, XPS and SEM analysis were investigated. The initial and mean insulation resistance of the same with $MoO_3$ film were about 1.4[$M{\Omega}$] and 800[$k{\Omega}$] under the condition of applied voltage of 400[V]. The preferred orientation in the films changed from(100) to (210) with substrate temperature. Two XPS peaks of the $MoO_3$ photoelectron were detected at the binding energies of 228.9[eV] and 232.4[eV], while the binding energy of the O1s peak was 532.6[eV]. The substrate temperature and reactivity gives large effects to the structure and growth of the film and system is also very useful for performing the uniform reactive deposition. It can be found from the result of a $MoO_3$ film deposition that the system is very useful for performing the uniform reactive sputtering.

• Journal of fish pathology
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• v.5 no.1
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• pp.1-7
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• 1992

CHSE(Chinook Salmon Embryo)-214 fish cell lines was cultured in Eagle's minimal medium (MEM) supplemented with 10% fetal bovine serum and 2mM-glutamin. Optimum growth temperature of CHSE-214 cell line was $20^{\circ}C$. Infectious pancreatic necrosis virus(IPNV) was successfuly multiplied and showed the cytopathic effect in CHSE-214 cell line. Infection symptom of IPNV was observed with inverted phase contrast microscopy. At 6h-12hrs post-infection, the cells infected with IPNV were similer to normal cells. At 18-24hrs post-infection, the cells were somewhat round form and a little swollen form than normal cells. At 30hs post-infection, the cells were becoming more abnormal cells. At 48-68 post-infection, the infected cells were lysed and showed the severe cytopathic effect.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.02a
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• pp.374-375
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• 2013

Al/Ni 나노 멀티 포일은 상온에서 외부 방전 및 촉발에 따라 급속한 자기 발열 반응이 일어나는 특성을 보여, 외부 촉발을 통해 상온에서 온도를 높일 수 없는 접합이나 마이크로 수준의 미세 접합이 가능한 접합재료로서 활용이 상당히 기대되는 재료이다. 본 연구에서는 스퍼터링법을 이용하여 한 층이 20 nm 이하에서 Al과 Ni의 혼합 기준을 달리한 Al/Ni 나노 멀티 900층을 제조와 제조된 반응성 포일이 자기 발열 반응에 따른 미세구조에 대해 조사하였다. 박막의 증착은 3~10 mTorr의 공정압력 으로 Al 타겟 전류 1.7 A, Ni 타겟 전류 1.4 A로 하여 증착시간을 조절하여 제조하였다. SEM과 EDX를 통하여 Al/Ni 나노 멀티 포일의 성장구조와 각 원소의 함량을 조사하였다. XRD 미세결정구조 분석은 제조된 반응성 포일과 외부 촉발시킨 후 자기 발열 반응에 의해 형성되는 혼합 상에 대한 조사를 실시하였다. 혼합기준이 1:1의 Al/Ni 나노 멀티 포일에서 약 $980^{\circ}C$의 발열이 발생하는 것을 Pyrometer를 통해 측정하였으며, 자기 발열 반응 후의 혼합 상은 AlNi이 형성되었다. Ni rich 포일에서는 약 $730^{\circ}C$의 발열이 발생하였고, 혼합상으로 주로 AlNi이 형성되었고 Al3Ni2도 나타났으며, 반응에 참여하지 못한 Ni이 남아있는 것을 관찰하였다. Al rich 포일에서는 약 $720^{\circ}C$의 발열과 함께 AlNi, $AlNi_3$이 형성되었고 반응에 참여하지 못한 Al이 미세하게 나타났다.

• Applied Biological Chemistry
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• v.30 no.3
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• pp.219-226
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• 1987

Peroxidase isozyme C was isolated from mung bean cotyledon and purified to homogeneity as ascertained by chromatography and polyacrylamide gel electrophoresis, and then crystallized. Purification procedures included ammonium sulfate precipitation and column chromatography on Sephadex G-75, DEAE-cellulose and DEAE-Sephadex A-50. Peroxidase isozyme C was purified about 63 fold with 5% recovery. Isozyme C showed optimal activity at pH 5.0 with o-dianisidine and at pH 6.0 with guaiacol as substrate, and the optimal temperature was $70^{\circ}C$. Molecular weight of 50,000 was estimated for the isozyme C by SDS-polyacrylamide gel electrophoresis. At $70^{\circ}C$, it took 30 min to inactivate the isozyme to 50%, and at $80^{\circ}C$, this isozyme was almost completely inactivated in 20 min. The Km value of isozyme C for o-dianisidine was 0.11mM and that for guaiacol was 60.98mM using hydrogen peroxide as cosubstrate, and the kinetic pattern showed a competitive cyanide inhibition with respect to substrate. The crystalline structure of isozyme C was rectangular in shape.

• Analytical Science and Technology
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• v.11 no.4
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• pp.260-265
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• 1998

Spherical, ${\mu}m$-sized particles of barium titanyl oxalate were prepared by thermal decomposition of dimethyl oxalate in acidic barium and titanium solutions. Precipitation was carried out in the presence of several supporting anions. Spherical particles having a specific type of particle size distribution. i.e., unimodal or bimodal distribution, with mean size in the range of $0.2{\sim}3{\mu}m$, were formed depending on the supporting anions, oxalate ion generation rate and aging time. Particles of barium titanyl oxalate settled on the bottom of the beaker at the aging time of 120 min grew to the critical monosize of about $1.5{\sim}3{\mu}m$. XRD spectra and chemical analyses of barium titanate showed that barium titanyl oxalate with high qualities could be synthesized by choosing chloride ion as a supporting anion and increasing the reaction temperatures.

• Korean Journal of Environmental Agriculture
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• v.4 no.2
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• pp.118-125
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• 1985

To establish an evaluation system of aquatic toxicity of chemicals at no-effect level, flow through and early life stage toxicity test were performed on a freshwater fish, the medaka (Oryzias latipes). The characteristics of medaka as a bioassay organism for the chronic toxicity test were discussed. Maximum acceptable toxicant concentration(MATC) of butachlor for the madaka in soft water was estimated using survival, growth, and reproduction as indicators of toxic effects. During a 3-month period, the fry of medaka were exposed to butachor concentrations ranging from 0.16 to 0.0l mg/liter and the DO concentration, temperature, and pH in the exposure chamber were measured to check the test condition. The highest concentration showed slight decrease of growth rate in medaka and reduced hatchability of spawning egg. Survival, growth, and reproductive success of adults in butachlor concentration of 0.04 and 0.01 mg/liter were not different from those of the control. The MATC was estimated to be between 0.04 and 0.16 mg/liter for medaka.