• 한국농공학회논문집
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• 제48권6호
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• pp.31-41
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• 2006

The analysis used in this work was cost-benefit analysis method. All future costs and returns of a given mushroom house were discounted to the time of initial investment (present) by means of 3.5% discount rate. Then the cost of ownership was compared to the return from the system. This analysis method has been developed and coded into a balance sheet for use on a EXCEL program. Using this programmed analysis,a large number of the case studies were examined using different combinations of economic conditions. These results will be very useful to individuals considering investment in a mushroom house, or any similar production system. By the way of the sensitivity analysis for each important parameter, the change of the marginal cost-benefit period could be finally determined. These parameters were typically construction cost of mushroom house, cost of cooling system, required cooling and heating energy amounts, unit price of mushroom media bottle, growing number of media bottles, production weight per unit bottle, sale price of mushroom, and annual number of growing period, etc.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2011년 춘계학술대회논문집
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• pp.117-123
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• 2011

The low electric power and high efficiency chips are required because of the appearance of smart phones. Also, high-capacity memory chips are needed. e-MMC(embedded Multi-Media Card) for this is defined by JEDEC(Joint Electron Device Engineering Council). The e-MMC memory for research and development is a memory mulit-chip module of 64GB using 16-multilayers of 4GB NAND-flash memory. And it has simplified the chip by using SIP technique. But mulit-chip module generates high heat by higher integration. According to the result of study, whenever semiconductor chip is about 10 $^{\circ}C$ higher than the design temperature it makes the life of the chip shorten more than 50%. Therefore, it is required that we solve the problem of heating value and make the efficiency of e-MMC improved. In this study, geometry of 16-multilayered structure is compared the temperature distribution of four different geometries along the numerical analysis. As a result, it is con finned that a multilayer structure of stair type is more efficient than a multilayer structure of vertical type because a multi-layer structure of stair type is about 9 $^{\circ}C$ lower than a multilayer structure of vertical type.

• 한국버섯학회지
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• 제2권1호
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• pp.10-14
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• 2004

버섯을 이용한 기능성 전통 장류발효식품의 개발 및 버섯가공산업 육성을 위한 기초자료를 제공하고자 상식하고있는 7종류의 곡물배지에 느타리버섯 균사체 배양을 행하고 그 배양추출물의 생리활성 등을 검토하였다. 곡물을 냉수에 4시간 수침시킨 후 물 빼기를 한 다음 곡물 중량비에 대하여 수분을 25%(V/W) 전후로 첨가하고 증자시간을 30분 행하는 것이 느타리버섯 균사생육에 효과적이었다. 7종류의 곡물배지에 느타리버섯 균사를 고체 배양한 결과 조와 보리쌀 배지에서 생육이 가장 왕성하였고 그 다음은 대두박과 검정콩 배지로 나타났으며 밀, 옥수수 및 현미배지에서는 생육이 늦은 것으로 나타났다. 느타리버섯 균사추출물들이 폐암세포의 생육에 미치는 영향을 검토한 결과 옥수수, 대두박, 현미, 보리쌀 및 검정콩 배지에서 비교적 높은 항암성을 나타내었고, 조와 밀의 배지에서는 낮은 항암성을 나타내었다. 혈전용해활성은 대두박, 밀, 조, 보리쌀, 현미, 검정콩, 옥수수배지의 순으로 높게 나타났으며, 병원성 세균에 대한 항균활성은 Pseudomonas aeruginosa 및 Staphylococcus aureus에 대하여 높게 나타났다.

• Ecology and Resilient Infrastructure
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• 제3권3호
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• pp.201-206
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• 2016

본 연구에서는 물리화학적 처리를 통하여 여재의 인 흡착능 회복을 위한 재생 방안을 연구하는 데 그 목적을 둔다. 실험에 사용한 여재는 Adphos이다. 열 처리 방법의 경우, 기 사용한 여재를 고온에 가열한 후 흡착실험을 수행한 결과, 재사용 여재의 $PO{_4}^{3-}-P$ 흡착량은 0.0021 - 0.0030 mg/g, 제거효율은 26.1 - 39.4%의 범위로 나타났다. 산 또는 pH 조건을 조절하여 수행한 실험 결과, 산성을 띠는 pH 1 - pH 5 조건에 처리한 경우 재사용 여재의 $PO{_4}^{3-}-P$ 흡착량은 0.0010 - 0.0066 mg/g, 제거효율은 15.8 - 87.1% 범위로 나타났다. 염기성을 띠는 pH 8 - pH 11 조건에 처리한 경우 재사용 여재의 $PO{_4}^{3-}-P$ 흡착량은 0.0018 - 0.0034 mg/g, 제거효율은 26.7 - 48.0% 범위로 조사되었다. 0.1 M, 0.01 M, 0.001 M 농도의 NaCl에 처리한 경우 재사용 여재의 $PO{_4}^{3-}-P$ 흡착량은 0.0036 - 0.0050 mg/g, 제거효율은 50.5 - 71.1%로 나타나 0.1 M NaCl을 이용한 약품처리법에서 재사용 여재의 인 흡착능 회복성이 높은 것으로 조사되었다.

• Journal of Microbiology and Biotechnology
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• 제9권3호
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• pp.282-291
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• 1999

Lactic acid bacteria were isolated from Kimchi and screened for bacteriocin. A total of 99 strains showed antimicrobial activity when grown on solid media, yet only 10 showed antimicrobial activity in liquid media. Strain H-559, identified as Lactococcus lactis subsp. lactis, exhibited the strongest inhibitory activity and was active against pathogenic bacteria including Listeria monocytogenes, Staphylococcus aureus, and Bacillus cereus as well as other lactic acid bacteria. The antimicrobial substance produced by L. lactis subsp. lactis H-559 was confirmed to be a bacteriocin by the treatment of $\alpha$-chymotrypsin, and protease type Ⅸ and ⅩIV. The bacteriocin activity remained stable between pH 2.0 and pH 11.0 and during heating for 10 min at $100^{\circ}C$. The bacteriocin production started in the exponential phase and stopped in the stationary phase. L. lactis subsp. lactis H-559 showed the highest bacteriocin activity at a culture temperature of $25^{\circ}C$, and an inverse relationship between the bacteriocin productivity and mean growth rate at different culture temperatures was observed. The mean growth rate and bacteriocin productivity of L. lactis subsp. lactis H-559 increased as the initial pH of the media increased.

• Journal of Microbiology
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• 제39권1호
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• pp.17-23
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• 2001

Various pretreatment procedures and selective media were applied to assess the optimal conditions for the isolation of rare actinomycetes from soil. Pretreatment of wet-heating for 15 min at 70$^{\circ}C$ and phenol treatment of soil suspension were the most effective methods for the isolation of these microorganisms. Hair hydrolysate vitamin agar (HHVA) was the most suitable medium for the recovery of rare actinomycetes. Thirty-five rare actinomycete strains were chosen using selective isolation approaches, then morphological and chemical properties of the isolates were determined. The isolates belonged to one of the following genus, Micromonospora, Microbispora, Actinoplanes and Streptosporangium.

• 환경위생공학
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• 제10권1호
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• pp.98-105
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• 1995

In the treatment of wastewater or sewage plant sludge with high solid concentration, high rate digestion process in which heating and mixing occur at a time is mainly used, and in the case of wastewater containing solid matter below 1000mg/ℓ the recently developed AF or UASB is developed Recently and commonly utilized. But these processes have weakpoints such as clogging of packing media and need of long period of trial run after microorganism granulation. In this point of view, there are active researches on the ASBR( anaerobic sequence batch reaction ) that is capable of treating of organic matter with reactor that has no packing materials and controlling the inflow time, reaction time sedimentation time and outflow time by time control without loss of microorganisms. The objectives of this study are to evaluate the efficiency of ASBR process according to the reaction time, change of treated water quality and gas output rate in the treatment of wheat plant wastewater.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 추계학술대회논문집B
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• pp.255-260
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• 2000

Laser zone texture technology is widely used to enhance the tribological performance of high areal density media. This work investigates the transient process of melting and microscale surface deformation upon pulsed laser heating of Ni-P hard disk substrates by PLIC(Piecewise Linear Interface Calculation) method. The present results are compared with both the experimental and the Donor-Acceptor method results. It is found that the results from PLIC method are better than those of Donor-Acceptor method and they are in good agreements with the experimental results.

• Journal of Magnetics
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• 제19권3호
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• pp.237-240
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• 2014

For heat-assisted magnetic recording, magnetization reversal probabilities of nano-Pt/MnSb multilayer film with perpendicular magnetic anisotropy under thermal pulse activation were investigated numerically by solving the Landau-Lifshift Gilbert Equation. Magnetic parameters of nano-Pt/MnSb multilayer were used with anisotropy energy of $3{\times}10^5$ erg/cc and saturation magnetization of 2100 G, which offer more than 10 y data stability at room temperature. Scheme of driven magnetic field and thermal pulse on writing mechanism was designed closely to real experiment. This study found that the chosen material is potential to be used as a high density magnetic storage that requires low writing field less than two-hundreds Oersted through definite heating and cooling interval. The possibility of writing data with a zero driven magnetic field also became an important result. Further study is recommended on the thickness of media and thermal pulse design as the essential parameters of the reversal magnetization.

• Journal of applied mathematics & informatics
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• 제14권1_2호
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• pp.193-212
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• 2004

A new model of generalized thermoelasticity equations for isotropic media with temperature-dependent mechanical properties is established. The modulus of elasticity is taken as a linear function of reference temperature. The present model is described both generalizations, Lord Shulman (L-S) theory with one relaxation time and Green-Lindsay (G-L) with two relaxation times, as well as the coupled theory, instantaneously. The method of the matrix exponential, which constitutes the basis of the state space approach of modern control theory, applied to two-dimensional equations. Laplace and Fourier integral transforms are used. The resulting formulation is applied to a problem of a thick plate subject to heating on parts of the upper and lower surfaces of the plate that varies exponentially with time. Numerical results are given and illustrated graphically for the problem considered. A comparison was made with the results obtained in case of temperature-independent modulus of elasticity in each theory.