• 한국응용곤충학회지
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• 제61권4호
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• pp.555-562
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• 2022

흰점박이꽃무지(Protaetia brevitarsis seulensis) 유충을 사육상자(가로 543 × 세로 363 × 높이 188 mm) 안에서 뽕나무 발효톱밥 기반 사료를 이용하여 집단으로 사육할 때(25℃, 16:8 L:D), 투입될 수 있는 갓 부화한 유충의 밀도를 검토하였다. 100-175마리 투입구는 90일후 생존율이 80% 이상으로 사육밀도 사이에 차이가 없었다. 그러나 200마리 밀도에서는 생존율이 약 10% 이상 감소하였다. 100-150마리 밀도에서 유충 평균 무게는 처리 밀도 사이에 유의한 차이가 없었으나, 175마리와 200마리 밀도에서는 100마리 밀도에 비해 유충 무게가 유의하게 낮았다. 사육밀도가 낮을수록 유충 무게가 더 빨리 증가하였다. 이상의 결과를 종합하여 100-150마리가 처음 투입밀도로 적절하다고 판단하였다. 두 번째 실험으로, 종령 유충을 저온에 보관하는 조건을 검토하였다. 종령 유충을 4개의 무게 집단(1.8-2.0, 2.0-2.3, 2.3-2.5, 2.5 g 이상)으로 구분하여 4, 8, 10℃에 보관하였을 때, 4℃에서는 70일 보관된 유충들은 무게에 관계없이 모두 사망하였다. 그러나 8℃에서는 70일 보관집단에서 약 80%의 유충이 생존하였다. 보관하는 유충의 무게가 무거울수록 생존율이 높았다. 4℃ 보관에서는 무게가 2.3 g 이상인 유충을 50일까지 보관한 후 우화한 성충들만 적은 수의 산란을 하였다. 8℃와 10℃ 처리에서는 유충 무게에 관계 없이 모두 산란을 하였다. 이상의 결과로부터 무게가 2.3 g 이상인 흰점박이꽃무지 종령 유충을 8℃에서 30-50일 범위에서 저장할 수 있다고 판단하였다.

• 수산경영론집
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• 제28권2호
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• pp.39-66
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• 1997

The objective of this study is to suggest the improvement method of the profitability in our marine fish culture business. So I investigated the actual condition for aquaculture farms in South Sea coast by the question and actual survey. 1 recognized the following facts; 1) The marine floating netcage system are a great portion in two province - Kyeongnam and Cheunnam, 2) The rockfish are reared absolutely much more than the olive flounder, 3) The polyculture by various species are more carried out than the monoculture of the olive flounder or rockfish, etc. I analyzed the profitability in olive flounder monoculture, rockfish monoculture, olive flounder and rockfish polyculture, and rockfish polyculture taking turns year by year respectively. At a result I comfirmed that the net income to net sales was the highest in the olive flounder monoculture bacouse the olive flounder,s sale price was higher than rockfish price. But internal rate of return(IRR) and net present value(NPV) were high in the olive flounder and rockfish polyculture or the rockfish taking turns polyculture. The reasons were alttributed to their high utility of a netcage and to reduction of a capital cost. So, I suggest 1) to feed the bigger product in short term, 2) to reduction of a feed and seed cost, 3) to increase a survival rate of fish and 4) to enlarge production by highly utilizing a netcage. And I recognized that a aquaculture manager should make constantly an effort to gain more profit by rearing more good products and by reducing a production cost.

• Journal of Nutrition and Health
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• 제16권2호
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• pp.81-88
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• 1983

This study was performed to investigate the influence of the amino acid composition of diet and environment on RNA, protein content in brain and learning ability in rats. Forty-two Sprague-Dawley male rats were divided into six groups according to type of diet, casein, soybean meal, or corn gluten and rearing condition, isolated or enriched. They were fed foods ad libitum for 6 weeks. A water maze was used to test behavioral performance for 3 weeks from 4th week. The rats were sacrificed at 6th week and their whole brains were taken and frozen for assay of RNA and protein. The results were summarized as follows : 1) The body weight gain for the experimental periods of corn gluten group was significantly lower than the casein and the soybean meal group. 2) The brain weight of the corn gluten group was significantly lower than the casein and the soybean meal group and the environmental enrichment slightly increased it among rats fed the corn gluten diet. 3) The total RNA contents were the greatest in the environmentally enriched casein group. The brain protein contents of the isolated corngluten group was the smallest. However, the contents of the enriched corn gluten group were similar to those of the others. 4) In the water maze test, the isolated corngluten group spent significantly more time than the others. Environmental enrichment could decrease time to perform the task of the maze.

• Fisheries and Aquatic Sciences
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• 제23권2호
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• pp.4.1-4.9
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• 2020

Growth of fish is controlled by various environmental factors, including water temperature (WT). WT is also a major factor that affects the eating behavior of fish. In this study, we studied the relationship between WT and expression profiles of factors involved in appetite regulation and digestion in red spotted grouper. Fish were divided into three groups with 30 fish per group and reared for 2 weeks in a recirculating system at three different WT (natural WT, 20 ℃, and 25 ℃). After 2 weeks, they were sacrificed immediately after food intake (+ 0 h), 3 h after (+ 3 h), 6 h after (+ 6 h), and 3 h before being fed the next day (- 3 h). Fish samples were obtained for analysis of mRNA expression levels of cholecystokinin (CCK), leptin A (LepA), leptin B (LepB), and neuropeptide Y (NPY) in the brain, liver, and intestine. Expression of CCK and NPY mRNA was significantly higher at 25 ℃ compared to that at natural WT and 20 ℃, but no difference was observed for leptin. This suggests that the red spotted grouper shows characteristics typical of subtropical fish and has higher levels of feeding and digestion when reared at 25 ℃ water temperature condition.

• Asian-Australasian Journal of Animal Sciences
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• 제21권2호
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• pp.262-269
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• 2008

The aim of this study was to determine the effects of breeder age and stocking density on performance, carcass characteristics and some stress parameters (H-L ratio, serum glucose, cholesterol and triglyceride levels, tonic immobility test (TI), antibody production, relative asymmetry (RA) and external appearances). This experiment was carried out with 705 one-day old male broiler chicks (Ross 308) obtained from three different ages of broiler breeder (32, 48 and 61 wks). Each age group was randomly divided into two stocking density groups (11.9 and 17.5 broilers per $m^2$) with 5 replications per group. The experimental period was 6 weeks. Broilers from 32 wk-old breeders had lower initial weight (p<0.001), body weight gain of the first 3 week of rearing (p<0.01), the percentage of abdominal fat (p<0.001) and serum cholesterol level (p<0.01); higher percentage of gizzard (p<0.01) and longer TI duration (p<0.001) than those from 48 and 61 wk-old breeders. Broilers reared at 17.5 b/m2 had lower final BW, body weight gain, feed consumption, feather condition and foot health (p<0.001), higher percentage of heart, H-L ratio, serum glucose and cholesterol levels (p<0.001), and longer TI durations (p<0.001). There were no significant interactions in examined parameters except for feed to gain ratio between breeder age and stocking density.

• 한국신뢰성학회지:신뢰성응용연구
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• 제4권2호
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• pp.73-90
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• 2004

We performed the heat aging test to predict the useful lifetime of Elastomeric Bearing Chloroprene Rubber (CR) used for supporting bridge. During the test, we measured elongation that are influenced by temperature and aging time. The failure of a test piece is defined as the point at which the elongation reaches to 75% of the initial value. This failure criterion is based on KS F 4420: 1998 (Elastomeric Bearing for bridge). Through the accelerated heat aging test, we found that the Arrhenius relationship and the Weibull lifetime distribution are appropriate as the life-temperature relationship and lifetime distribution of the CR, respectively. Using the Arrhenius -Weibull model, the parameters of the model are estimated and the lifetime of the CR at use condition is predicted.

• 가정과삶의질연구
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• 제27권2호
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• pp.77-97
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• 2009

This study evaluates the poverty experiences of low-income single mothers according to the Capability Approach of Amartya Sen. In this approach, the capability to achieve the basic functionings of life, not income itself, is the criterion of poverty. 26 single mothers were interviewed using focus-group interviews and in-depth interviews. 21 functionings on the existence level, 18 on the relatedness level, and 15 on the growth level were found in the areas of work, health, food consumption, clothing, housing, child rearing, and leisure. The results of this study suggest that low-income single mothers can achieve only some of the existence level functionings with significant help from welfare services. They can scarcely achieve higher level functionings in any of these areas.

• 한국환경교육학회지:환경교육
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• 제16권2호
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• pp.1-14
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• 2003

This study aims to review the present condition of human resources development in environment technology area and to explore the direction of human resources development plans, based on the results of a survey targeting experts in this area. Related papers & literatures are referred and a survey for experts' opinions are carried out. The survey was oriented to the importance and effectiveness of policies designed by Korea Ministry of environment. The main findings of this study are as follows; firstly, an emphasis should be put on generating professionals in charge of creating domestic demand for environmental purposes for promotion to make excellent environmental techniques being of practical use and help them go into businesses was turned out crucial; secondly, it is advised to upgrade the level of qualifications of environmental technicians by reforming into a graduate schoolcentered educational system on a human resource-rearing phase; thirdly, retraining should be provided by law to ensure the enhancement of re-educating the existing environmental technicians; fourth, efforts should be made to promptly develope new techniques and unify declining traditional items, deterring national technical qualification system oriented toward cultivating superintendents in the environment field.

• 여성건강간호학회지
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• 제18권4호
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• pp.257-267
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• 2012

Purpose: This study was conducted to identify the caring experience of the mothers of childhood burn patients. Methods: Data were collected from 28 mothers of childhood burn patients, through semi-structured in-depth interviews. Data were categorized and coded by using content analysis. Results: 27 categories and 102 statements were drawn from 4 domains. The analyzed domains were psychological sufferings, confronted harsh reality, coping method, and future concerns. Psychological sufferings were categorized heartache, sense of guilt, confusion, regret, depression, sorriness, getting hurt, frustration and upset feeling. Confronted harsh nature were categorized economic difficulty, physical burn-out, lack of caring other children and family troubles. Coping method were categorized positive thinking, having hope, ventilating feelings, accepting the situations, demanding help from family members, changing patterns of the burned child rearing, collecting information for burn treatment, refusing accept the condition of burned child, avoiding personal and social relationship, and reliance on religion. Concerns were categorized concerns of growth and adaptation of the burned child, anxiety for scar, concerns of adapting school life and vague future concerns. Conclusion: The nursing interventions for early assessing psychological problems and providing social supports for caring both burn patients and other siblings should be provided to the mothers of childhood burn patients.

• Fisheries and Aquatic Sciences
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• 제16권1호
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• pp.25-34
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• 2013

Early ontogenic development in Siberian sturgeon Acipenser baerii was documented and the effects of different temperatures on embryonic and prelarval development were examined. Photograph-assisted data on morphogenesis in Siberian sturgeon prolarvae agreed well with published descriptions of their ontogeny and ecological behaviors, although certain aspects of differentiation, such as gill covering and scute development, could be rearing condition-sensitive. The present study provides the first characterization of the transient development of teeth during early larval stages; the pattern was congruent with the transition of prolarvae to exogenous feeding. From examinations of embryonic and prelarval development under different temperature conditions ($12-24^{\circ}C$), developmental speed was inversely related with temperature. Overall, hatchability was higher and hatching events were more synchronized at $20^{\circ}C$ than at lower temperatures. After hatching, similar patterns of temperature-dependency were observed in yolk sac absorption and the evacuation of the pigment plug. Our results suggest that the incubation of Siberian sturgeon embryos and prolarvae at temperatures close to $20^{\circ}C$ would be advantageous in hatcheries, based on reductions in the duration and uniformity of egg and prolarval developmental stages.