• 한국정보시스템학회지:정보시스템연구
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• 제32권4호
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• pp.137-147
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• 2023

Purpose The domestic aquaculture industry in South Korea utilizes both formulated feeds and live feeds for the cultivation of fish. While nutrient-rich live feeds, particularly using fry, have been preferred since the past, formulated feeds are gaining attention due to issues related to overfishing and environmental concerns. Formulated feeds are advantageous for storage and supply but require a sustained feeding regimen due to the comparatively slower growth rate compared to live feeds. As the aging population in rural areas leads to a shortage of labor, automated feeding systems are increasingly being adopted in aquaculture facilities. To enhance the efficiency of such systems, it is crucial to quantitatively analyze the behavioral changes in fish based on the presence or absence of feed. Design/methodology/approach In the study, RGB cameras and infrared cameras were used to analyze fish activity according to feeding, and an outline extraction algorithm was applied to analyze the differences resulting from this. Findings Unlike RGB cameras, infrared cameras are more suitable for analyzing underwater fish activity as they convert objects' thermal energy into images. It was observed that Canny, Sobel, and Prewitt filters showed the most distinct identification of fish activity.

• 생태와환경
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• 제39권1호통권115호
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• pp.131-137
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• 2006

Most South Korean lakes are middle/small size artificial reservoirs, which are almost agricultural reservoirs (17,956). A total of 67 species (21 families) were recorded and collected from 65 agricultural reservoirs though field samplings and literature surveys. Dominant species was Pseudorasbora parva (relative abundance 24.5%), and Carassius auratur (41 sites) was the highest frequency. Feeding group of fish communities in the reservoirs was as follows: carnivorous (16.2%), omnivorous (79.5%) and herbivorous fish (4.3%). The number of individuals (P=0.024), species number (P=0.047) and carnivores number (P=0.024) were significantly correlated with reservoir ages. Reservoirs were classified into 3 groups according to feeding patterns of carnivore, omnivore and herbivore groups. The omnivores were dominant group in agricultural reservoirs. Detailed studies on fish community will be a base for the understanding of food web structure and biomanipulation in reservoir systems.

• 한국양식학회지
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• 제12권4호
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• pp.309-315
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• 1999

In order to understand the initial feeding time of larvae red marbled rockfish, Sebastiscus tertius changes of mouth size were investigated. Also, the fecundity of different size of red marbled rockfish broodstocks was measured. The broodstocks of red marbled rockfish, S. terius of $32.3\pm6.52 cm$ and larger than 45cm in total length spawned 296,648 and 600,000 larvae, respectively. About 50% was normal healthy larvae among the spawned ones. Mouth sizes calculated by the angle mouth opening and upper jaw length for newly spawned red marbled rockfish larvae were 0.263, 0.197 and 0.132 mm at D, 0.75D and 0.5D, respectively, when the upper jaw length was 0.186mm. Thereafter, 20 days old larvae showed 0.822, 0.617 and 0.411 mm in calculated mouth length at D, 0.75D and rockfish larvae grows, their upper jaw length gradually increased. 2 days old red marbled rockfish larvae possibly stated to feed rotifers and lasted their feeding for the another 35days, relatively long periods compared with other larvae fish. And 25 days old larvae possibly fed the newly hatched Artemia nauplii and lasted their feeding for the another 20 days, like other larvae fish. The proper supplying time of artificial feeds for the red marbled rockfish larvae seemed to be around 10 days after spawning.

• 환경생물
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• 제26권3호
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• pp.203-213
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• 2008

Benthic macro invertebrate communities were collected at six different sampling sites in the Musucheon stream in Korea from July 2006 to July 2007, and ecological exergy values were calculated based on five different functional feeding groups (collector-gatherer, collector-filterer, predator, scrapper, and shredder) of benthic macro invertebrates. Each sampling site was categorized to three stream types (perennial, intermittent and drought) based on the water flow condition. Exergy values were low at all study sites right after a heavy rain and relatively higher in the perennial stream type than in the intermittent or the drought stream type. Self-Organizing Map (SOM), unsupervised artificial neural network, was implemented to pattern spatial and temporal dynamics of ecological exergy of the study sites. SOM classified samples into four clusters. The classification reflected the effects of floods and droughts on benthic macroinvertebrate communities, and was mainly related with the stream types of the sampling sites. Exergy values of each functional feeding group also responded differently according to the different stream types. Finally, the results showed that exergy is an effective ecological indicator, and patterning changes of exergy using SOM is an effective way to evaluate target ecosystems.

• Clinical and Experimental Pediatrics
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• 제51권8호
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• pp.820-826
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• 2008

목 적 : 9개월 영아의 수유방법에 따른 철결핍빈혈의 빈도와 적혈구 혈액상을 알아보고자 이 연구를 시행하였다. 방 법 : 2007년 1월부터 12월까지 생후 9개월의 특이병력이 없는 영아 253명의 혈액검사를 시행하고 부모를 대상으로 수유방법과 이유식에 대한 설문조사를 하여 결과를 얻었다. 결 과 : 총 253명 중 모유수유 123명(48.6%), 혼합수유 69명(27.3%), 인공수유 61명(24.1%)였다. 수유방법에 따른 적혈구 혈액상은 모유수유군에서 혼합수유군이나 인공수유군에 비하여 유의하게 낮았다(P<0.05). 253명 영아 중 25명에서 철결핍빈혈로 판명되어 9.9% 빈도를 보였고 수유방법에 따라서는 모유수유군에서 18.7%, 혼합수유군에서 1.4%, 인공수유군에서 1.6%의 빈도를 보여 모유수유군에서 빈혈 발생빈도가 유의하게 높았다(P< 0.05). 이유식 시작 시기에 따른 철결핍빈혈의 빈도는 생후 6개월 이내에 이유식을 시작한 영아 113명 중 6명(5.3%), 6개월 이후에 이유식을 시작한 영아는 140명 중 19명(13.6%)로 이유식을 늦게 시작한 군에서 철결핍빈혈의 빈도가 유의하게 높았다(P<0.05). 결 론 : 생후 9개월의 영아가 내원하였을 때 수유 방법이나 이유식에 대한 문진을 통하여 철분 등을 포함한 영양 상태에 관하여 알아보고 선별적 빈혈 검사를 통하여 철결핍빈혈의 예방과 치료에 힘써야 할 것이다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2023년도 추계학술발표대회
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• pp.358-360
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• 2023

뱀장어는 내수면 양식어종으로 뱀장어 양식에서 널리 쓰이는 지수식 양식에 있어서 가장 중요하고 가장 어려운 것은 수질관리다. 수질을 구성하는 요소와 공급된 사료량은 서로 상관관계를 가지며, 이 상관관계에 이상 현상이 발생하면 먹이 섭취 불량과 폐사로 이어질 수 있다. 그래서 본 연구에서는 센서로 측정한 양식장 데이터와 인공지능 모델을 이용하여 수조 속 DO 를 예측하는 모델을 새롭게 제안하여, 적절한 사료 공급 시점과 적절한 공급량을 결정하는 방안에 적절히 사용할 수 있다는 것을 검증하였다. 사료 공급과 공급량에 따른 변화를 가미한 3 시간 후의 DO 를 합당한 이벤트 처리를 통해 예측하였다. 이를 활용하면 사료로 인해 떨어지는 DO 수치를 예측하고, DO 수치가 낮아 회복이 필요한 시점에 투입하는 사료량을 조절하여 질식으로 인해 발생하는 폐사로부터 양식어를 지키며 보다 안정적으로 양식을 위해 활용할 수 있다는 점을 확인할 수 있었다.

• Asian-Australasian Journal of Animal Sciences
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• 제18권7호
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• pp.973-979
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• 2005

The present study was planned to examine the effect of different feeding regimens on milk urea concentration and milk protein concentration. The objectives are to describe the diurnal variations of milk urea (MU) concentration and to predict plasma urea (PU) concentration from MU concentration. Six lactating Murrah buffaloes were distributed in two groups and were fed two different diets in a crossover design. The diets consisted of leguminous crops as diet 1 (berseem (Trifolium alexandrinum)+concentrate mixture 1+wheat straw)) and non-leguminous crops as diet 2 (oats (Avana sativa)+concentrate mixture 2+wheat straw). All the diets were isocaloric and isonitrogenous. Each diet was fed to the animals for a period of 28 days, followed by a 10 day gap to obviate the carry over effect of the previous diet and then a switch over to the other diet. Digestibility trials were conducted on the last 7 days of each feeding period. Milk samples were collected on day 3, 7, 10, 14, 17, 21, 24 and 28 of the feeding period and blood samples were collected on the same day at morning within 30 minutes after morning milking. The average milk urea (MU) values (mg/dl) differed significantly (p<0.01) and were 44.83${\pm}$0.62 and 42.53${\pm}$0.73, respectively, for diets 1 and 2. Milk urea concentrations (mg/dl) also varied (p 0.01) among the days of feeding period, but were stabilized after 10th day of feeding period. In contrast, diets and days of feeding period had no significant effect on percent milk protein. Plasma urea concentration showed a significant (p<0.01) positive correlation (r = 0.93) with MU concentration. To predict the PU from MU the following equation was developed 'PU = 10.67${\pm}$0.76${\times}$MU (mg/dl) with $R^2$ = 0.87'. A clear diurnal variation of MU was found with lowered morning value (42.04${\pm}$0.68 mg/dl) than the evening value (45.32${\pm}$0.66 mg/dl). Present findings suggested that MU or PU concentration could be used as an indicator to monitor the feeding strategy. Plasma urea can be predicted from MU, whenever interpretation of milk urea data required consideration of diurnal variation.

• Fisheries and Aquatic Sciences
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• 제1권1호
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• pp.30-34
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• 1998

Rotifer culture fed on five types of artificial microparticle diets were evaluated to substitute the natural diets such as Chlorella or w-yeast. These microparticle diets including solidified blood using squid oil (SBSO), solidified blood using soybean oil (SBSB), nylon protein walled particle (NPW) simple coacervation oil capsule (SCO), complex coacervation oil capsule(CCO), were tested for the evaluation of feeding efficiency. The prepared micro particle diets had diameters ranging from 3 to 30 Jim. Rotifer culturing experiments were carried out in 3-liter beakers for 13-16 days. The initial inoculum density of rotifers was 10 ind./ml. The rotifers fed on Chlorella or $\omega-yeast$ showed maximal densities of 2,000 ind./ml in 9 days or 500 ind./ml in 7 days, respectively. Those fed on SBSO, SBSB or NPW showed maximal densities of 1568 ind./ml, 586 ind./ml or 503 ind./ml, respectively and the reproductive rates for those diets were equivalent to or better than w-yeast. However, the coacervated oil capsule showed lower maximal densities of 400 ind./ml for SCO and less than 100 ind./ml for CCO due to the unbalanced diet formulation and indigestibility.

• 한국수산과학회지
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• 제42권1호
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• pp.56-62
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• 2009

Feeding regimens was investigated for the growth and survival rate of juvenile Maroon clownfish (Premnas biaculeatus) in order to establish a seed production technique for this fish. Three types of feeding regimens were used, and growth and survival were highest under the following regimen: rotifer from day 0, Artemia from day 4, copepod from day 9 and artificial food from day 15, respectively (P<0.05). The average body lengths of the larvae were $6.76{\pm}0.55\;mm$, $7.63{\pm}0.50\;mm$ and $7.33{\pm}0.43\;mm$ in the Nannochloropsis oculata, Isochrysis galbana and control treatments conducted with 3 larvae/L, respectively (P<0.05). There were significant differences in larval growth between the treatments and controls conducted with 6 larvae/L and 9 larvae/L, respectively (P<0.05) but there was no significant difference between the N. oculata and I. galbana treatments (P>0.05). There were no significant differences in larval growth between the treatments at densities of 3-9 larvae/L (P>0.05). At highest density level, the larvae reared in I. galbana had the highest survival rate whereas survival was lowest in the control.

• 대한한방소아과학회지
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• 제15권2호
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• pp.31-41
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• 2001

We studied 100 neonates to enter a Dongguk University Oriental Hospital Postpartum Care Center, during 9 months from February 10. 2001 to November 4. 2001. The conclusion is following. 1. Newborn sex ratio was 1.70. 2. Delivery method : Normal vaginal delivery was 66 and cesarean section was 34. 3. Gestation age : Premature infants less than 37 weeks were 2 term infants from 37 to 41 weeks were 98 and post-term infants 42 or more weeks were zero. 4. Period between birth and admission : First to fifth day was 66 sixth to tenth day was 32 and eleventh or more day was 2. 5. Period of admission : 1 to 7 days were 8. 8 to 14 days were 65. 15 to 21 days were 23. and 22 to 28 days were 4. 6. Weight : Birth weight less than 2500g was 3. 2500 to 3999g was 92. and 4000g or more was 5. 7. Height : Zero week after birth the average height was 48.8cm, one week after birth was 50.0cm, two weeks after birth was 51.8cm, three weeks after birth was 53.2cm, four weeks after birth was 54.5cm. 8. Head circumference : Zero week after birth the average head circumference was 34.6cm, one week after birth was 35.3cm, two weeks after birth was 35.7cm, three weeks after birth was 36.3cm, four weeks after birth was 36.8cm. 9. Chest circumference : Zero week after birth the average chest circumference was 33.2cm, one week after birth was 33.5cm, two weeks after birth was 34.4cm, three weeks after birth was 35.1cm, four weeks after birth was 36.6cm. 10. Feeding : There was not breast feeding, artificial feeding was 8, and mixing feeding was 92. 11. Jaundice : Physiologic jaundice was 10, pathologic jaundice was 1.