• KSII Transactions on Internet and Information Systems (TIIS)
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• 제18권8호
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• pp.2431-2449
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• 2024

As problems such as water pollution and fish species depletion have become serious, a land-based fish farming is receiving a great attention for ensuring stable productivity. In the fish farming, it is important to determine the timing of shipments, as one of key factors to increase net profit on the aquaculture. In this paper, we propose a system for predicting net profit to support decision of timing of shipment using fish farming-related statistical data. The prediction system consists of growth and farm-gate price prediction models, a cost statistics table, and a net profit estimation algorithm. The Gaussian process regression (GPR) model is exploited for weight prediction based on the analysis that represents the characteristics of the weight data of cultured fish under the assumption of Gaussian probability processes. Moreover, the long short-term memory (LSTM) model is applied considering the simple time series characteristics of the farm-gate price data. In the case of GPR model, it allows to cope with data missing problem of the weight data collected from the fish farm in the time and temperature domains. To solve the problem that the data acquired from the fish farm is aperiodic and small in amount, we generate the corresponding data by adopting a data augmentation method based on the Gaussian model. Finally, the estimation method for net profit is proposed by concatenating weight, price, and cost predictions. The performance of the proposed system is analyzed by applying the system to the Korean flounder data.

• 한국양식학회지
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• 제15권4호
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• pp.261-266
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• 2002

본 연구에서는 광합성세균 또는 젖산균 등과 같은 유용 미생물에 의한 육상수조식 양식장 배출물의 재활용이 가능한지 평가하였다. 제주에 있는 육상수조식 양식장의 배출물을 조사 분석한 결과 배출물은 회분, 수분과 더불어 단백질, 지방으로 구성되어 있었다. 따라서 배출물이 광합성세균 또는 젖산균의 생장에 대한 기질로서 이용 가능한지를 평가하였다. 배출물은 광합성세균 생장의 기질로서 이용할 수 있었으며, 젖산균의 경우에는 당분을 첨가하면 기질로서 이용할 수 있었다. 본 결과는 육상수조식 양식장에서 배출되는 배출물이 유용미생물에 의하여 효과적으로 재활용될 수 있는 가능성을 제시하였다.

• 한국수산과학회지
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• 제31권6호
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• pp.908-913
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• 1998

육상수조를 이용한 해산어의 양식은 사육환경의 악화와 질병발생 등으로 인하여 생산성이 점차 저하되고 있으며, 배출수로 인해 양식장 주변연안의 환경문제점을 유발하고 있다. 따라서, 본 연구는 시스템 및 자동화 설계기술을 이용하여 유입수처리를 위한 스크린필터와 배출수 처리를 위한 드럼필터의 개발을 위한 기초단계로서 각각에 대한 개념 설계를 수행하고, 이를 바탕으로 한 실험용 모델의 제작가 운행을 수행하였다. 그 결과 현장용필터제작에 필요한 초기설계 및 상세설계에 대한 자료를 얻을 수 있었으며, PLC를 이용한 자동화는 장치의 효용성을 향상시킬 수 있었다.

• 한국어병학회지
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• 제17권1호
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• pp.57-66
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• 2004

본 연구는 우리나라 주요 양식어류인 넙치, Paralichthys olivaceus를 대상으로 육상수조식 양식장 배출물 발효물의 어류 사료 첨가에 따른 혈액학적 변동에 미치는 영향을 검토하였다. 젖산균 및 효모를 사용하여 발효한 양식장 배출물의 이화학적 분석을 실시하였고, 발효물을 0.1, 0.5, 1.0 및 5.0% 농도로 8주간 투여하였다. 투여 4주째 및 8주째에 각 투여 구간별로 혈액학적 항목을 중심으로 그 차이를 확인하였다. 배출물 발효농도별 유의한 차이는 나타나지 않았지만, 분석시기에 따른 적혈구수, 혈색소 농도 및 혈색소 지수가 증가하는 경향을 나타내었으나, 주요 혈청 무기 및 유기성분은 배출 발효물 농도별로 유의한 차이는 나타나지 않았다. 또한 혈청 효소학적 조사에서는 조사시기별로 변동은 나타났지만, 동일 조사시기에서 각 구간별 유의한 차이는 나타나지 않았다. 따라서 이러한 육상 양식장 유래의 배출물 발효산물에 대한 다양한 방면의 연구가 진행되어야겠다.

• 수산해양교육연구
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• 제26권2호
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• pp.444-454
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• 2014

The range of optimization problem in aquaculture is very wide, resulting from the range of species, mode of operation. Quite a few studies focus marine net-cages, but studies on land based culture farm are few or no. This paper considers a allocation problem to meet production planning in land based aquaculture system. A water pool allocation model in land based aquaculture system was developed. The solution finds the value of decision variable to minimize yearly production costs that sums up the water pool usage cost and sorting cost. The model inputs were (1) the fish growth rate (2) critical standing corp (3) number of water pool (4) number of fish. The model outputs were (5) number of water pool in growing phase (6) cost of cultivation (6) optimal facility allocation(number of water pool for each growing phase). To solve the problem, an efficient heuristic algorithm based on a greedy manner is developed. Branch and bound and heuristic is evaluated through numerical examples.

• 수산경영론집
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• 제46권3호
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• pp.129-141
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• 2015

Because land based aquaculture is restricted by high investment per rearing volume and control cost, good management planning is important in Land-based aquaculture system case. In this paper master production planning was made to decide the number of rearing, production schedule and efficient allocation of water resources considering biological and economic condition. The purpose of this article is to build the mathematical decision making model that finds the value of decision variable to maximize profit under the constraints. Stocking and harvesting decisions that are made by master production planning are affected by the price system, feed cost, labour cost, power cost and investment cost. To solve the proposed mathematical model, heuristic search algorithm is proposed. The model Input variables are (1) the fish price (2) the fish growth rate (3) critical standing corp (4) labour cost (5) power cost (6) feed coefficient (7) fixed cost. The model outputs are (1) number of rearing fish (2) sales price (3) efficient allocation of water pool.

• 한국전자통신학회논문지
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• 제19권4호
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• pp.763-770
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• 2024

현재 해수를 이용하는 육상 양식장에서는 실시간 수질 모니터링 및 시설 자동화 시스템, 용존산소 자동 공급장치 등 다양한 장비를 도입하여 사용하고 있다. 또한 양식장의 다양한 장비에서 수집되는 데이터는 수질 환경, 시설 운영, 작업장 영상정보 등 정형, 비정형 형태의 빅데이터를 생산한다. 양식장 운영 환경에서 생산되는 빅데이터는 운영 및 생산 효율 개선을 목표로 다양한 방법을 개발하고 적용을 시도하고 있다. 본 연구에서는 육상 양식장에서 생산되는 빅데이터를 효과적으로 분석하고 시각화하기 위한 시스템을 개발하는 것을 목표로, 양식장 빅데이터 분석 시스템에서 활용이 가능한 데이터 시각화 프로세스를 제시하고 빅데이터 시각화 도구를 개발하고 결과를 비교한다. 그리고 시계열 특성을 가지는 빅데이터의 비교 및 탐색이 직관적인 시각화 모델을 제시한다.

• ALGAE
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• 제26권3호
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• pp.253-263
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• 2011

Phenotypic plasticity was examined in the economically and ecologically important brown alga Ascophyllum nodosum in southwestern Nova Scotia, considering specifically how nutrient loading affected its vegetative and reproductive features. To determine this, we examined morphometric changes in A. nodosum from two sites receiving direct effluent impacts from a land-based finfish aquaculture facility and from two control sites, approximately 2 km away from the aquaculture facility in opposite directions. Fronds from test sites were significantly younger than from control sites (5 y vs. 8 y); however, fronds from farm sites were significantly larger (219 g vs. 90 g) because of their higher growth rates. Thalli from farm sites had greater reproductive potential, as shown by numbers of receptacle initials (797 initials vs. 281 initials). These results suggest limited nutrient inflows from land-based aquaculture may positively affect adjacent Ascophyllum populations by inducing higher growth rates. We conclude that the coordination of effluent management from land-based aquaculture with natural resource harvesting of A. nodosum may be beneficial. Further study is necessary to determine the limits of nutrient loading for this potentially beneficial outcome.

• 한국수산과학회지
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• 제47권5호
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• pp.622-629
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• 2014

This study induced biological denitrification and nitrification via a biofiltration process with the view of removing nitrogen from land-based fish farm effluent. To achieve this, we operated an aquaculture nitrogen-removal system that includes a denitrification and nitrification reactor [working volume 40 L, flow rate 64.8 L, HRT (hydraulic retention time) 14.8 h, HRT considering recycling of NOx 7.4 h]. In the continuous process, the nitrification rate of ammonium nitrogen exceeded 90% at a steady state and the denitrification efficiency exceeded 80% with recycling to a pre-anoxic reactor. In addition, the pH in the final effluent was lower with a low influent water alkalinity averaging 100 mg/L (as $CaCO_3$). For effective denitrification reactions, carbon must be supplied via particulate organic matter (POM) hydrolysis because of the low C/N (carbon/nitrogen) ratio in the water.

• 한국수산과학회지
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• 제50권3호
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• pp.250-256
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• 2017

This study investigated the removal efficiency of organic matter and nitrogen from fish farm effluent by hydraulic retention time (HRT) using an upflow biological filter (ANR system) reactor. The recycling time and influent flow in the reactor were controlled to 14.8, 7.4, 5.5 and 3.2 h to evaluate HRT. In addition, each reactor was coupled to a fixed bed upflow filter charged with media. The results showed that removal efficiency was ${\geq}95%%$ with an HRT of 5.5 h, and nitrification efficiency was reduced to 81% with an HRT of 3.2 h, although nitrification efficiency temporarily decreased due to the shock load as HRT decreased. Total nitrogen removal rate was also reduced to about 65% with an HRT of 3.2 h, which was considered a washout effect of nitrifying and denitrifying microorganisms by increasing the shearing force to the filter media, which decreased organic matter and nitrogen removal efficiency.