• 한국패류학회지
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• 제29권4호
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• pp.283-289
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• 2013

In order to improve oyster farming condition, estimation of food availability (CC) was carried out in Garorim Bay, Seosan, Korea. The primary production of the waters were ranged from 0.07 to $0.26gC/m^2/day$. A strong tendency was observed that the inner side of the bay was higher at primary production. Estimated food availability was ranged from 0.0424 to 1.655. Temporal shortage in food supply was observed at April with about 15% less than the oysters' requirement, which may be causative of spat mortality after introducing into the farms. Food availability was met the food demand during summer but significant shortage was also observed at after August, which may main causative of retarded oyster fattening in the waters. This study suggested that adjustment of cultural density may be necessary for the improved harvesting of the oyster.

• Fisheries and Aquatic Sciences
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• 제12권2호
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• pp.118-129
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• 2009

To develop a sustainable management model for oyster farming in Pukman Bay, Korea, we estimated the carrying capacity for oyster farming using food availability data. Optimal culture densities were calculated to be 124-133 individuals per unit flux area ($m^2$) and 310-330 individuals per string. The present annual production is approximately 1,038 tons/year, which is 87% of the estimated maximum yield of 1,193 tons/year. Therefore, considering annual fluctuations and a critical buffer to reduce ecological impacts, the current level is within optimal conditions. During periods of increased water temperature, energy demand was largely met by high primary production. The food supply significantly decreased as the harvest season approached, and 10 out of 21 oyster farms had a deficient food supply for at least 1 month. Therefore, these farms (39% of the farms within the bay) exceeded optimal densities.

• 한국태양에너지학회 논문집
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• 제27권1호
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• pp.1-9
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• 2007

This paper reveals both the operational situation and the cause of the error occurred in wind turbine generator system of Hangwon wind farm in Jeju island. The four wind turbines were selected for this work, and the monitored period was for six months. Wind resource in the wind farm was analyzed, and the estimated energy production was compared with the actual energy production. As a result, with a decrease of system error, the estimated energy production was in good agreement with the actual energy production. The errors occurring in components such as gearbox and hydraulic motor affected the Availability of the wind turbine. Also, poor external conditions such as a strong wind, lightning and gust caused a standstill of wind turbines.

• 지질공학
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• 제34권2호
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• pp.263-277
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• 2024

본 연구에서는 연천지역의 개발 가능한 지하수의 양을 추정하기 위해 분포형 수문모형 SWAT-K를 이용하여 토지이용, 토양분포 특성에 따른 함양량을 산정하였다. 모형의 검보정 결과 관측유량과 모의유량의 결정계수가 0.75~0.97로 양호하게 나타났으며 계산된 지하수 함양량은 겨울과 봄에 걸쳐 낮은 함양률을, 여름철에는 높은 함양률을 나타내는 시공간적 특성을 보였다. 계산된 연평균 함양률을 자연유량의 기저유출률과 비교하여 추정된 함양량의 타당성을 검토하였다. 지하수 개발가능량은 통계학적 빈도해석 기법을 이용한 10년 빈도 갈수시의 함양량으로 산정하여 연강수량의 11.5%인 것을 확인할 수 있었다.

• 보건의료산업학회지
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• 제4권1호
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• pp.145-156
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• 2010

The purpose of this study is one of high price medical equipment wished to grasp propriety factor about the MRI introduction, analyzing payability through cost accounting into compensation. It was investigated from January 1 to December 31, 2007 about the MRI of a General Hospital. Expectation availability was 23.2 cases, but actual availability did achievement more than 196.1% with 45.5 items. It is estimated that there are a lot of occurrence cases because great reasons that actual availability increases more than expectation availability is excellent resolving power than a CT, and is device that prefer to reason back that radiation damage is less in person body. The followings show the main results of this study. 1. The MRI was construed in order of cost accounting, wave and personnel expenses 45.4%, administrative expenses 53.0%, and material costs 1.6%. 2. According to CVP (Cost-volume-profit) analysis, BEP (Break Even Point) profit is 173,931,428 won for 11 months, and break even usage number of items are 37.5 cases, and separation usage number of items were confirmed by 1.4 cases. Therefore, was construed that can achieve BEP within 11 months though usage number of items keeps 1.4 items day to create the MRI's hospital operation profit. 3. Estimated limit profitability appears high by 96.7%, exceed fixed charges even if when is non-benefit and when it is benefit consider variable, is judged that the MRI's addition induction helps in hospital management enhancing earning rates.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 F
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• pp.2129-2131
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• 1997

A sensorless controller of induction motor has several advantage: availability in a harsh environment. In this paper, the speed information is driving from the currents and the estimated stator flux. To obtain the estimated stator flux, this study is using The Estimator. The simulation results show that the proposed scheme has activity over a wide speed range and good response to load variations

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 추계학술대회 논문집 학회본부
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• pp.509-511
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• 1997

A sensorless controller of induction motor has several advantage availability in a harsh environment. In this paper, the speed information is driving from the currents and the estimated stator flux. To obtain the estimated stator flux, this study is using the Estimator. The simulation results show that the proposed scheme has activity over a wide speed range and good response to load variations.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.1473-1480
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• 2008

본 연구는 현장 운영데이터 분석을 통한 도시철도차량 도어장치의 RAM(신뢰성, 가용성, 유지보수성) 성능 평가 사례를 다룬다. 이를 위하여 도어장치의 고장을 분류하고 정의하며, 각 고장 범주별 신뢰도를 운영 데이터를 통해 분석한다. 유지보수성 평가를 위해서 유지보수 전문가를 통해 LRU(Line Replaceable Unit)를 분류하고 LRU별 교환시간의 추정하여 도어시스템의 평균수리시간을 추정한다. 도어시스템의 가용도는 분석된 신뢰도 및 유지보수성을 기반으로 분석한다. 본 연구에서 제시하는 도어 시스템의 RAM 평가 사례는 도어시스템의 적절한 RAM 요구조건의 수립과 운영단계의 RAM 성능 향상을 위한 정책 수립으로 이어질 수 있을 것으로 기대된다.

• 한국식품영양과학회지
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• 제39권7호
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• pp.1078-1082
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• 2010

본 연구는 해조류 세포벽에 결합된 무기질은 모두 이용되지 않는다는 전제하에 해조류의 세포벽물질(중성세제불용성섬유: neutral detergent fiber, NDF)을 측정하고 이에 결합된 미량 무기질 Fe, Cu, Zn, Mn의 함량을 조사하여 해조류내에 함유되어 있는 무기질 함량에서 빼줌으로써 계산하여 해조류의 무기질 이용률을 추정하였다. 해조류 총 7종에 대해, 해조류 100 g당 NDF에 결합된 무기질 Zn, Cu, Mn의 평균 함량은 각각 1.78, 0.43, 0.23 mg으로 그에 따른 이용률이 각각 90.56, 85.43, 87.26%로 모두 85% 이상의 높은 이용률을 나타냈다. 반면, Fe은 NDF에 결합된 무기질 함량이 22.42 mg/100 g으로 비교적 많은 양이 결합되어 있어 그 이용률은 68.36%로 낮은 이용률을 보였다. Fe이 NDF에 가장 많이 결합한다는 보고와 같이 해조류에서도 식이섬유인 NDF에 결합된 Fe의 함량이 많아 그 이용률은 상대적으로 낮았다. 하지만 그 외 Zn, Cu, Mn의 이용률은 85% 이상으로 높아 인체 내의 소화율을 고려한다 하더라도 이들 무기질은 높은 추정 이용률을 보일 것으로 판단되어 인체 영양상 미량 무기질의 좋은 식품자원으로써 그 이용을 기대해 본다.

• Asian-Australasian Journal of Animal Sciences
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• 제12권7호
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• pp.1054-1062
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• 1999

The effects of dry roasting whole faba beans (WFB) and whole lupin seeds (WLS) at 110, 130 or $150{^{\circ}C}$ for 15, 30 or 45 min on rumen (RDCP%), estimated intestinal (IDCP%) and total tract disappearance of CP (TDCP%) and intestinal availability (IARUCP%) of rumen undegraded CP (RUCP%) were determined. The RDCP values were estimated by in sacco technique by incubating nylon bags for 8, 12 and 24 h in the rumen of dairy cows. The IDCP and IARUCP values were estimated using a sequence of ruminal incubation, in vitro incubation in acid-pepsin for 1 h and then in pancreatin for 24 h of three-step in vitro procedure technique. Dry roasting at 130 and $150^{\circ}C$ decreased RDCP with correspondingly increasing IDCP. The IDCP value generally increased from 12.3(raw) to 8.6, 14.8 and 39.6% (WFB) and from 28.3 (raw) to 33.7, 36.2 and 56.2% (WLS) at 8 h rumen incubation; from 2.9 (raw) to 2.9, 4.6 and 23.3% (WFB) and from 19.6 (raw) to 19.0, 24.0 and 46.6% (WLS) at 12 h rumen incubation; from 1.3 (raw) to 1.9, 1.7 and 11.0% (WFB) and from 4.4 (raw) to 4.2, 10.7 and 36.7% (WLS) at 12 h rumen incubation as the temperatures rose to 110, 130 and $150{^{\circ}C}$ respectively. The TDCP values were always high and increased by time in the rumen, the average values of which were 97.9, 96.6; 99.2, 96.9 and 99.6, 98.7% for WFB and WLS, respectively, at 8, 12 and 24 h rumen incubation. But within the same retention time, TDCP was generally unchanged. The average IARUCP increased from 87.3 (raw) to 87.4, 88.7 and 92.0% (WFB); from 87.6 (raw) to 88.9, 91.5 and 93.0% (WLS) at roasting temperatures of 110, 130 and $150{^{\circ}C}$, respectively. It was concluded that dry roasting can shift the digestion of CP from rumen to the lower gastrointestinal tract without depressing the digestion of RUCP. The best processing condition in this study was dry roasting at $150{^{\circ}C}$ for 45 min in terms of effects on the disappearances and availability of CP. Research data on intestinal availability of individual amino acids need to be further investigated.