• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1988년도 한국자동제어학술회의논문집(국제학술편); 한국전력공사연수원, 서울; 21-22 Oct. 1988
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• pp.822-825
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• 1988

In this paper, we present a system which enables a real-time measurement of the number and also the body length of the fry (baby fish) using a line image sensor. Here, we consider a situation that fry are transported from a pond to another, pond through a pipe. At one position of the pipe a transparent rectanglar channel is mounted. The images of the fry, which run through this rectanglar channel, are detected by a line image sensor. The image signals are digitized to binary ones and the contour of the fry are detected. After that, a real-time image analysis is executed with a digital signal processor. Labeling program analyses the connection of every pixel. The results are transfered to a personal computer and displayed on the online monitor graphically.

• Ocean and Polar Research
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• 제41권1호
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• pp.35-46
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• 2019

The purpose of this study is to identify factors influencing fish production of shallow-sea aquaculture in South Korea. This study employed the two-way fixed effect and random effect models based on the panel models and also the difference between GMM and system GMM models based on the dynamic panel models using the amount of fish farming production, the number of stocked fry, the number of cultured fish, the amount of inputted feed, the farming area, the number of workers, and the sales price data from 2010 to 2017. First, the two-way fixed effect model of the panel models was selected by panel characteristics, time characteristics and Hausman tests and also the model was statistically significant. As a result of the two-way fixed effect model, the number of stocked fry, the amount of inputted feed, and the number of workers were identified as factors that increase the fish production of shallow-sea aquaculture. However, the number of cultured fish and the sales price were analyzed as factors that reduce the fish production of shallow-sea aquaculture. Second, the system GMM model of the dynamic panel models was selected by Hansen test and Arellano-Bond test in order to identify whether or not the over-discrimination condition is appropriate. Based on the system GMM model, the number of stocked fry, the amount of inputted feed, the number of workers in this year and 1 year ago, the number of cultured fish 2 years ago, and the sale price 3 years ago were analyzed as factors that increase the fish production of shallow-sea aquaculture. However, the amount of fish farming production 1, 2, 3 years ago, the farming area in this year, and the number of cultured fish in this year and 1 year ago were identified as factors that reduce the fish production of shallow-sea aquaculture. In conclusion, this study suggests that it is desirable to control the amount of stocked fry rather than to expand the farming area for fish farming in shallow-sea aquaculture, so as to keep the sale price at a certain level by maintaining the appropriate amount of fish production.

• 한국축산식품학회지
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• 제40권5호
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• pp.785-794
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• 2020

Food Codex regulations have set freshness limits for oils used to fry food, such as potato and fish products, and fried food itself; however, no such freshness limits have been set for meat products, such as sweet and sour pork. The freshness standard suggest that acid values (AVs) and peroxide values (POVs) for frying oil should be less than 2.5 and 50, respectively, whereas AVs and POVs for common fried food should be less than 5.0 and 60, respectively. Therefore, in this study, we investigate the effect of the number of frying cycles on oxidation-promoted changes in the oils used to fry sweet and sour pork and fried food itself during repeated frying over 10 d by determining their AVs and POVs, which were found to be highly correlated. Soybean, canola, palm, and pork lard oils could be reused approximately 37, 32, 58, and 87 times, respectively, to fry sweet and sour pork based on oil freshness, and 78, 78, 81, and 286 times, respectively, based on the freshness of fried food. Our data may help establish food-quality regulations for oils used to fry animal-based foods.

• 수산경영론집
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• 제49권4호
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• pp.19-36
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• 2018

Overstock in aquaculture is a matter of concern in aquaculture management. To sort fish based on fingerling size in case of overstocking is an important problem in aquaculture farm. This study aims to determine the amount of fry overstock and sorting time in aquaculture farm. This study builds a mathematical model that finds the value of decision variables to optimize objective function summing up the fingerling purchasing cost, aquaculture farm operating cost and feeding cost under mortality and farming period constraints. The proposed mathematical model involves following biological and economical variables and coefficients: (1) number of fingerlings, (2) sorting time, (3) fish growth rate and variation, (4) mortality, (5) price of a fry (6) feeding cost, and (7) possible sorting periods. Numerical simulation is presented herein. The objective of numerical simulation is to provide decision makers to analyse and comprehend the proposed model. When extensive biological data about growth function of fry becomes available, the proposed model can be widely applicable to real aquaculture farms.

• 수산경영론집
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• 제48권3호
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• pp.47-59
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• 2017

Fish mortality is the most important success factor in aquaculture management. To order fingerlings considering the effect of mortality is a important problem in aquaculture farm. This study is aimed to decision the number and size of fry in aquaculture farm. This study build the mathematical model that finds the value of decision variable to minimize total cost that sums up the fingerling purchasing cost, aquaculture farm operating cost and feeding cost under mortality constraint. The proposed mathematical model involve biological and economical variables: (1) number of fingerlings (2) fish growth rate (3) mortality (4) price of a fry (5) feeding cost, and (6) possible order period. Numerical simulation model presented here in. The objective of numerical simulation is to provide for decision makers to analyse and comprehend the proposed model. When extensive biological and cost data become available, the proposed model can be widely applied to yield more accurate results.

• 한국환경생태학회지
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• 제33권2호
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• pp.202-215
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• 2019

본 연구는 2015-2018년 5월 기간 동안 납자루아과 어류의 서식 집단 중 강원도 홍천 내촌천(HN), 덕치천(HD), 정선 골지천(JG) 및 조양강(JJ)을 대상으로 기 개발된 제한절편 길이 다형성(restriction fragment length polymorphism; RFLP) 분자마커를 이용하여 숙주조개 속 난 및 치어에 대한 정확한 종 동정을 수행 후 납자루아과 어류의 숙주조개 크기에 대한 산란양상을 파악하고자 하였다. 연구대상 지역 내 납자루아과 어류는 내촌천과 골지천에서 1종(묵납자루; Acheilognathus signifer), 덕치천에서 3종(각시붕어; Rhodeus uyekii, 묵납자루; A. signifer, 줄납자루; Acheilognathus yamatsutae), 조양강에서 2종(묵납자루, 줄납자루)으로 확인되었고, 네 지역에서 모두 동서하고 있는 숙주조개인 작은 말조개(Unio douglasiae sinuolatus) 982개체를 채집하였다. RFLP 분자마커를 이용하여 납자루아과 어류의 난 및 치어가 확인된 작은말조개(N=163; 16.6%)에서 총 646개체의 납자루아과 어류의 난 및 치어(묵납자루 454, 줄납자루 43, 각시붕어 149개체)를 확인하였다. 각 지역 숙주조개 크기에 따른 산란선호도를 조사하기 위해 난 및 치어가 확인된 숙주조개(mussels with [presence] eggs/fry)와 확인되지 않은 숙주조개(mussels without [absence] eggs/fry)의 각장(shell length), 각고(shell height) 및 각폭(shell width)의 평균 크기를 비교하였다. 그 결과 3종의 납자루아과 어류가 동서하는 덕치천의 경우 난 및 치어가 확인된 숙주조개가 확인되지 않은 숙주조개보다 각장(1.98mm), 각고(0.85mm), 각폭(0.73mm)의 크기가 통계적으로 유의하게 크게 나타났으며(Mann-Whitney U tests, P=0.002, P=0.012, P=0.009), 다른 세 개의 지역에서도 난 및 치어가 확인된 조개의 각장, 각고, 각폭의 크기가 큰 결과를 보였으나, 통계적으로 유의하지는 않았다. 추가적으로 종 간 숙주조개 당 평균산란 난 및 치어의 수를 분석한 결과 각시붕어 $9.31{\pm}5.94$개, 묵납자루 $2.86{\pm}2.45$개, 줄납자루 $2.50{\pm}1.32$개로 각시붕어는 묵납자루와 줄납자루보다 숙주조개 당 평균 6.45~6.81개 더 많이 산란하였고, 통계적으로 유의한 결과를 나타내었다(Kruskal-Wallis test, P<0.001). 이 결과는 본 연구 대상 납자루아과 어류 3종에서 크기가 큰 작은말조개를 산란을 위한 숙주로서 선호함을 의미하고, 조개 크기에 대한 선호도 차이가 동서하는 납자루아과 종의 수가 많을수록 크게 나타났다. 또한, 묵납자루와 줄납자루의 경우 많은 숙주조개에 적은 양의 난을 추가적으로 고르게 산란하는 반면에 각시붕어는 비교적 적은 수의 숙주조개에 많은 양의 난을 산란하는 번식전략을 나타내었다. 2종 이상의 납자루아과 어류가 서식하는 덕치천(HD)과 조양강(JJ)에서 묵납자루와 줄납자루 2종이 동일한 조개에 산란하는 것이 관찰되었다(N=4). 이는 납자루아과 어류가 2종 이상 동서할 때, 동일한 자원인 작은말조개를 자신의 산란숙주로 이용하기 위한 종간경쟁(interspecific competition)이 일어나고 있는 것으로 판단된다. 본 연구에서는 기존 연구된 생태학적 연구에 유전학적인 방법을 추가하여 각 집단 간, 종 간 숙주조개 크기에 대한 산란양상을 보다 정확히 규명하여 숙주조개를 이용하는 납자루아과 어류의 생태적 적응양상을 명확히 파악하고 더 나아가 숙주조개와 납자루아과 어류의 공생(mutualism) 혹은 숙주-기생의 상호관계(host-parasite relationship)를 규명하는데 기여할 수 있을 것으로 기대한다.

• 한국식품과학회지
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• 제49권1호
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• pp.50-55
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• 2017

본 연구는 축산물에 사용되는 식용유지의 기준설정을 위하여 모니터링을 실시하였다. 축산물에 사용되는 유지(대두유, 카놀라유, 팜유, 돈지)를 선정하여 식품공전에 고시되고 있는 규격과 비교하여보았다. 상관관계를 구축하여 축산물에 사용되는 식용유지와 일반식품에 사용되는 식용유지의 신선도여부를 파악하였으며, 축산식품과 일반식품의 사용유지 실험값 비교분석을 통한 식품공전에 따른 유지기준(산가 2.5 mg KOH/g 이하, 과산화물가 50 meq/kg 이하)을 축산물에도 적용 가능한 지의 여부를 검토하였다. 또한 튀김유지 뿐만 아니라, 유지별 튀김횟수에 따른 튀김식품에 대한 산가, 과산화물가 값을 측정하여 축산물(돈까스)이 일반식품(냉동감자)보다 적은 튀김횟수에서 일반식품의 산가 기준치(5.0 mg KOH/g), 과산화물가 기준치(60 meq/kg)에 도달하는 것을 알 수 있었다. 따라서 본 연구를 통하여 축산물에 사용되는 유지의 기준 규격마련을 위한 기초자료로 사용될 수 있다.

• 생물환경조절학회지
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• 제22권1호
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• pp.61-64
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• 2013

본 연구는 오크라 종자를 볶았을 때의 기능성을 성분을 분석하여 용도 다양화를 위한 볶음차로의 이용 가능성을 검토하기 위하여 수행하였다. 꼬투리 당 오크라 종자의 수는 '그린소드' 품종이 78개, '베니' 품종이 88개 이었고, 과실 당 종자무게는 각각 4.4g과 6.3g이었다. 볶은 오크라 종자의 유리아미노산 함량은 $2.69mg{\cdot}g^{-1}$으로 생체종자의 $0.31mg{\cdot}g^{-1}$에 비해 8.7배나 높은 함량을 나타내었다. 총 페놀성 화합물 함량은 볶은 오크라 종자가 12.61mg CGA로 서 생체 상태보다 5배 높은 함량을 나타내었다. 오크라 종자의 항산화 활성은 DPPH 및 ABTS의 경우 볶은 오크라 종자가 생체 상태의 오크라 종자 보다 약 2배 이상 월등히 높게 나타내었다.

• 한국수산과학회지
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• 제54권1호
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• pp.31-37
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• 2021

The mass production of fertilized eggs of the convict grouper Hyporthodus septemfasciatus was studied from 2013 to 2020 for industrial aquaculture. The experiment was divided into two groups. Group 1 broodstock was raised from wild-caught fry and used from 2013 to 2020. Group 2 broodstock was raised from artificially propagated fry and used from 2019 to 2020. Males used to collect sperm for artificial insemination weighed more than 7 kg. The effects of various hormones on artificial ovulation were investigated from 2013 onward. Among these, luteinizing hormone-releasing hormone analogue (LHRHa) at 100 ㎍/kg body weight showed the most effective results and was used for artificial egg collection from 2014 onward. In Group 1, the average total egg production per year, average egg production per individual, fertilization rate, and hatching rate were 26,143 mL, 609.7 mL, 93.3%, and 91.8%, respectively, and in Group 2, were 2,750 mL, 316.5 mL, 92.1%, and 90.4%, respectively. Based on these results, we showed that a large number of fertilized eggs for artificial seeding could be produced consistently. Moreover, the mass production of fertilized eggs in Group 2 establishes a foundation for the complete aquaculture cycle of H. septemfasciatus.

• 한국식품조리과학회지
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• 제12권2호
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• pp.129-137
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• 1996

The purpose of this study was that to estimate the microbial and sensory quality by the method and time of holding in the step of holding of Cow's Knee Broth, Stir-Fry Pork and Cooked Cuttlefish that were provide at the industry foodservice establishment, then to suggest safer feeding by the reasonable holding method. The results are as follows: Cow's Knee Broth: holding at room temperature was shown that the number of mi- crobiology by passage of the holding time was higer than the case of holding at steam table, but it was lower after reheating it. As a result of sensory test, it was exellent to holding at steam table and to reheat after holding room temperature within four hours and six hours each. Stir-Fry Pork: as a result of microbial analysis, in the case of holding at the steam table microbes increased safer two hours, but after four and six hours they little reduced. In the case of holding at room temperature the number of microbes increased according to the passage of time. As a result of sensory analysis, its taste of room temperature holding was fine until four and six hours each. Cooked Cuttlefish: as a microbial analysis, it was shown that the amount of total plate counts of room temperature holding ten times as high as the latter after six hours. As the result of sensory analysis, the cold holding was better until six hours and the room temperature holding was fine just until two hours. As a result of food poisoning bacteria, it was negative in every test in sample against Salmonella, Staphylococcus aureus, Vibrio parahaemolyticus.