• 생명과학회지
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• 제14권1호
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• pp.126-130
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• 2004

곰보버섯(Morchella esculenta)은 맛과 영양이 풍부한 버섯으로 전 세계적으로 분포하는 버섯이다. 현재까지 우리나라에서 곰보버섯에 관한 체계적인 연구가 이루어지지 않은 상태에서 본 연구는 곰보버섯(자실체) 인공대량 생산방법 개발 및 심부배양을 통한 균사체 및 다당체 대량생산 공정개발을 위한 기초자료를 얻고자 shaking flask culture를 이용한 곰보버섯 균사체 배양특성에 관하여 조사하였다. 곰보버섯 균사체의 최적 배양온도는 $25^{\circ}C$이며, 최적 초기 pH는 6.5, 최적배지는 BG 이었다. BG 배지를 기본배지로 하여 영양 요구성 실험을 한 결과 최적탄소원은 fructose이고 최적농도는 5.0% (w/v)이며 질소원 선발 및 최적농도에서는 peptone과 NH$_4$Cl를 혼합하여 사용하였을 때 최대 균사체생육을 보였고, 상기의 두 질소원을 1:1의 무게비로 혼합하여 4.0% (w/v) 농도로 첨가하였을 때 최대 균사생육을 보였다.

• 생명과학회지
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• 제13권4호
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• pp.492-497
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• 2003

액체배양을 이용한 잣버섯(Lentinus lepideus KACC 50120)의 균사체 생육에 관한 결과로는 최적온도는 $25^{\circ}C$이고, 최적 pH는 5.5이었다. 공시배지중에서 최대 균사 생육을 보인 최적배지는 YMG 배지로 조사되었다. YMG 배지를 기본배지로 하여 영양 요구성 실험을 한 결과 탄소원 선발 및 최적 농도에서는 최적 탄소원은 glucose이고 최적 농도는 4.0%(w/v)이며 질소원 선발 및 최적 농도에서는 malt extract와 yeast extract를 혼합하여 사용하였을 때 최대 균사 생육을 보였고, 상기의 두가지 복합질소원을 1:1의 무게비로 혼합하여 1.5%(w/v)농도로 첨가하였을 때 균사생육이 가장 양호하였다.

• 한국토양비료학회지
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• 제49권6호
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• pp.699-704
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• 2016

An estimation of optimal requirement of additional N by cropping pattern and growth stage is very important for greenhouse watermelon. The objectives of this study were to estimate an amount of optimal additional N based on growth, N uptake and yield of watermelon. In order to achieve these goals, we performed the study at farmer's greenhouse with a fertigation system and watermelon was cultivated three times (spring, summer and autumn) in 2015. The levels of additional N were set up with x0.5, x0.75, x1.0 and x1.5 of the $NO_3$-N-based soil-testing N supply for watermelon cultivation. The trends of growth and N uptake of watermelon markedly differed from cropping pattern; spring (sigmoid), summer and autumn (linear). The yield of watermelon was the highest at summer season and followed by autumn and spring. Also, the x1.5N showed a significantly higher yield compared to other N treatments. On the basis of growth, N uptake and yield of watermelon, we estimated an optimal level of additional N by cropping pattern and growth stage as follows; 1) spring (transplanting ~ 6 WAT : 6 ~ 14 WAT : 14 ~ harvest = 5 : 90 : 5%), summer (transplanting ~ 4 WAT : 4 ~ 8 WAT : 8 ~ harvest = 25 : 50 : 25%) and autumn (transplanting ~ 4 WAT : 4 ~ harvesting : 50 : 50%). In conclusion, nutrient management, especially N, based on cropping pattern and growth stage was effective for favorable growth and yield of watermelon.

• 생명과학회지
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• 제14권4호
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• pp.560-566
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• 2004

버들송이버섯의 균사체 대량 생산의 기초자료를 얻을 일환으로 균사의 영양생장에 필요한 적합한 조건을 연구하고자 균사생장을 위한 최적 배양 조건 및 영양원을 조사한 결과는 다음과 같다 5종의 공시배지 중 ME 배지에서 버들송이 버섯의 균사생장 및 밀도가 가장 양호하였으며, 균사생장최적 온도는 $25^{\circ}C$이고, 최적 pH는 5.5이며 최적 배양일수는 12일이었다. 버들송이 버섯의 균사생장을 위한 최적 배지조성은 탄소원에서는 다당류인 dextrin이었으며, 최적 탄소원인 dextrin의 적정농도는 3% (w/v)였다. 질소원에서는 유기태 질소원인 yeast extract이었고, yeast extract 최적농도는 2% (w/v)였으며, 최적 무기염류는 MgSO$_4$와 KH$_2$PO$_4$이고, 최적 농도는 MgSO$_4$0.05% (w/v), KH$_2$PO$_4$0.15 (w/v)를 혼합하였을 때 가장 많은 생산량을 보였다. 기본배지인 ME 배지와 본 연구에서 얻어진 최적배지로 액체 배양하여 균체량을 비교한 결과 기본배지는 배양 12일째 최대 건조 균체량 7.59 g/l을 얻었으며, 최적배지는 배양 12일째 17.6 g/l의 최대 건조 균체량을 얻어 기본배지 보다 최적배지의 균체량이 훨씬 높은 균사체 생산수율을 보였다.

• 한국환경과학회지
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• 제6권5호
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• pp.481-488
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• 1997

Microorganisms capable of degrading trlchloroethylene(TCEI using phenol as a induction substrate were isolated from industrial effluents and soil. The strain MS-64K which had the highest blodegradablllty was identified as the genus Micrococcus. The optimal conditions of medium for the growth and blodegadatlon of trlchloroethylene were observed as follows; the initial pH 7.0, trlchloroethylene 1, 000ppm as the carbon source, 0.2% ${(NH_4)}_2SO_4$, as the nitrogen source. respectively. Lag period and degradation time on optimal medium were shorter than those on Isolation medium. Growth on the optimal medium was Increased. Addition of 0.1% Triton X-100 Increased the growth rate of Micrococcus sp. MS-64K, but degradation was equal to optimal medium. Trlchloroethylene degradation by Micrococcus sp. MS-64K was shown to fit logarithmic model when the compound was added at initial concentration of 1, 000ppm.

• 한국신뢰성학회:학술대회논문집
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• 한국신뢰성학회 2002년도 정기학술대회
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• pp.273-273
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• 2002

In this paper, we investigate a software release policy with software reliability growth factor during the warranty period by assuming that the software reliability growth is assumed to occur after the testing phase with probability p and the software reliability growth is not assumed to occur after the testing phase with probability 1-p. The optimal release policy to minimize the expected total software cost is discussed. Numerical examples are shown to illustrate the results of the optimal policy. And we consider a Bayesian decision theoretic approach to determine an optimal software release policy. This approach enables us to update our uncertainty when determining optimal software release time, When the failure time is Weibull distribution with uncertain parameters, a bayesian approach is established. Finally, numerical examples are presented for illustrative propose.

• 한국버섯학회지
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• 제3권1호
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• pp.40-44
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• 2005

노랑느타리버섯의 인공재배를 위한 우량균주 선발 및 균사배양적 특성을 조사한 결과는 다음과 같다. 1) 노랑느타리버섯균의 적정배지는 MCM에서 87.8mm/10일로 균사생장과 균사밀도가 가장 좋았으며, 그 다음은 PDA, YM, MEA, Czapek 순이었다. 2) 노랑느타리버섯의 균사생장과 밀도에 가장 적정한 온도는 $25^{\circ}C$이었으며 $5^{\circ}C$에서는 균사가 사멸하였다. KNAC2003 균주는 $25^{\circ}C$에서 87.8mm/10일로 균사생장과 밀도가 가장 양호하였으며, 온도별로는 25, 30, 20, 35, 10, $5^{\circ}C$ 순으로 균사생장 속도와 밀도가 좋았다. 3) 노랑느타리버섯의 균사생장과 밀도에 가장 적정한 산도(pH)는 6.0에서 88.3mm/10일이며 이보다 높거나 낮으면 균사생장과 밀도에 저해를 받는다.

• Clinical and Experimental Pediatrics
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• 제59권12호
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• pp.466-470
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• 2016

Early, aggressive nutrition is an important contributing factor of long-term neurodevelopmental outcomes. To ensure optimal growth in premature infants, adequate protein intake and optimal protein/energy ratio should be emphasized rather than the overall energy intake. Minimal enteral nutrition should be initiated as soon as possible in the first days of life, and feeding advancement should be individualized according to the clinical course of the infant. During hospitalization, enteral nutrition with preterm formula and fortified human milk represent the best feeding practices for facilitating growth. After discharge, the enteral nutrition strategy should be individualized according to the infant's weight at discharge. Infants with suboptimal weight for their postconceptional age at discharge should receive supplementation with human milk fortifiers or nutrient-enriched feeding, and the enteral nutrition strategy should be reviewed and modified continuously to achieve the target growth parameters.

• 한국자원식물학회지
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• 제11권1호
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• pp.15-21
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• 1998

This study was carried out to determine the effects of plant growth regulators on cell culture and organogenesis from Sicyos angulatus L. using explants of leaves, stems and cotyledons. Optimal callus induction for S. angulatus was obtained on MS medium with 0.1mg/$\ell$ BA and 2.0mg/$\ell$ 2,4 -D from cotyledons, 0.1mg/$\ell$ BA and 5.0mg/$\ell$ NAA from leaves explants, Optimal media for subculture and growth of S. angulatus callus were 1/2 MS medium with 0.1mg/$\ell$ BA and 1.0mg/$\ell$ 2,4 -D for solid culture, and 0.1mg/$\ell$ 2,4-D for suspension culture. Many adventitious roots with some shoots were formed were formed from leaf and cotyledon explants of S. angulatus during callus induction with optimal combinations of plants growth regulators.

• 한국정밀공학회지
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• 제18권10호
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• pp.116-126
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• 2001

This paper suggests a numerical method to find optimal geometric path and minimum-time motion for a spatial 6-link manipulator arm (PUMA 560 type). To find a minimum-time motion, the optimal geometric paths minimizing 2 different dynamic performance indices are searched first, and the minimum-time motions are searched on these optimal paths. In the algorithm to find optimal geometric paths, the objective functions (performance indices) are selected to minimize joint velocities, actuator forces or the combinations of them as well as to avoid one static obstacle. In the minimum-time algorithm the traveling time is expressed by the power series including 21 terms. The coefficients of the series are obtained using nonlinear programming to minimize the total traveling time subject to the constraints of velocity-dependent actuator forces.