• 한국산학기술학회논문지
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• 제18권2호
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• pp.390-397
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• 2017

외래어종의 유입은 토종어류의 감소 및 수중생태계의 교란을 가져올 수 있기 때문에 어류의 차단 및 관리 방안은 반드시 필요하다. 따라서 본 연구에서는 외래어종의 유입을 차단하기 위해 버블을 이용한 어류 차단 시스템을 개발하였으며 실험수로를 제작하여 차단 가능성을 평가하였다. 버블 발생장치는 공기압축기로 공기를 발생시켜 버블커튼을 만든 후 어류를 차단하는 시스템이며 실험어류는 국내 외래어종인 파랑볼우럭을 대상으로 하였다. 파랑볼우럭의 크기는 0.10 m ~ 0.15 m이며 수심은 0.70 m를 유지하였다. 실험수로의 유속은 어류의 유영능력을 고려하여 3단계로(0.20 m/s, 0.10 m/s, 0.05 m/s) 나누어 실시하였다. 실험 결과 파랑볼우럭은 버블 적용 전 70.07%가 상류로 거슬러 올라가려는 움직임을 보였으며 하류를 서식처로 생각해 움직임이 거의 없는 개체를 고려하면 어류 소상률은 더 높을 것으로 판단된다. 그러나 차단시설을 설치할 경우 대부분의 어류가 버블커튼에 의해 다시 하류로 회귀하는 움직임을 보여 차단효과가 매우 높게 나타났다. 특히 버블을 종료할 경우 빠른 시간 내 다시 상류로 거슬러 올라간 것으로 보아 버블을 이용한 어류 차단효과는 뛰어난 것으로 판단된다.

• 한국산학기술학회논문지
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• 제18권9호
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• pp.76-83
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• 2017

어류는 빛에 대해 민감한 반응을 보이므로 이를 이용한 어류 관리 기술 개발이 필요하다. 따라서 본 연구에서는 빛을 이용한 어류 차단 시설을 개발하였으며 국내 대표 외래어종인 배스와 블루길을 대상으로 조도 차이를 이용한 차단 효과를 분석하였다. 빛은 발광 다이오드를 이용해 발생시켰으며 바닥에서 수직 방향으로 향하게 설치하였다. 유속은 어류의 소상능력을 고려하여 총 3단계(0.2, 0.1, 0.05 m/s)로 구분하였으며 학습효과를 방지하기 위해 양육수조에서 1일 이상 휴식한 어류를 대상으로 실험하였다. 실험은 차단시설 적용 시 소상하는 어류 개체수와 차단시설 종료 후 소상하는 개체 수를 비교하는 방식으로 수행하였으며 차단 시설의 효과를 높이기 위해 일몰 후 수행하였다. 실험 결과 조도 차이에 따른 어류 차단효과는 높았으며 전반적으로 배스의 차단율이 블루길보다 낮았다. 전체 실험 개체수를 기준으로 배스의 차단율은 96.33%, 블루길의 차단율은 99.00%이며 소상 개체수를 기준으로 하면 배스는 91.73%, 블루길은 98.73%로 나타났다.

• Journal of Nutrition and Health
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• 제38권4호
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• pp.297-306
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• 2005

It is known that dehydroepiandrosterone (DHEA) shows a dual effect, prooxidant or antioxidant, depending on the do-sage or physiological status of animals. The purpose of this study was to determine the effects of DHEA administration at low dose on lipid peroxidation, protein carbonylation and fatty acid composition in liver. Sprague Dawley male rats were fed either com oil diet containing $15\%$ com oil or fish oil diet containing $2\%$ corn oil + $13\%$ sardine oil, with or without $0.2\%$ DHEA for 9 weeks. Atherogenic index and hepatic triglyceride and cholesterol levels were significantly reduced by DHEA administration in rats fed with fish oil diet. Hepatic lipid peroxide product (TBARS) and protein carbonyl levels were significantly higher in rats fed with fish oil diet than in rats fed with corn oil diet. However, DHEA administration significantly reduced the hepatic thiobarbituric acid-reactive substance (TBARS) and conjugated diene levels in rats fed with fish oil diet. Contents of C16 : 0, C16 : 1, C20 : 5 and C22 : 6 in hepatic microsome were higher in rats fed with fish oil diet than in rats fed with corn oil diet, and contents of C18 : 2 and C20 : 4 were lower than in rats fed with com oil diet. DHEA administration significantly increased C16 : 0 and C18 : 3 contents and reduced C18 : 2 content in rats fed with com oil diet, while it increased C16 : 0 and C18 : 1 and reduced C20 : 5 and C22 : 6 in rats fed with fish oil diet. On overall, DHEA administration increased saturated fatty acid (SFA) and reduced polyunsaturated fatty acid (PUFA) in hepatic microsome, thereby PUFA/SFA ratio was significantly (p < 0.0001) reduced without the change of n-3/n-6 ratio. Taken together, low dose of DHEA administration lowered PUFA/SFA ratio in hepatic microsomal membranes and also showed antioxidative effect especially in fish oil-induced highly oxidative stress condition through blocking increases of C20 : 5 and C22 : 6 contents.

• 지역연구
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• 제8권2호
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• pp.11-26
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• 1992

In spite of her abundant natural resources for tourist industry, Kangreung and Sokcho area became lagged in economic development during the national industrialization. The major purpose of this study is to exactly purpose of this study is to exactly measure the impacts of tourist industry on regional development. Through the regional input-output analysis, we found some critical facts: (1) Input coefficients are relatively high in those industries as fish products, food and drink products, and printing and publishing. (2) Input coefficients are high in fiber and apparel products, and other manufac-turing. (3) Induced production effects are high in chemical and coal products, fish products, food and fish products, printing and publishing, and public administration for Sokcho. (4) As for the induced employment effect, food and lodging, other services, wholesale and retail show high coefficients. (5) As for the location quotients, food and lodging, fish products, transportation and ware housing are identified as basic industries. Through the questionnaire survey, we also found some important facts: (1) Residents tend to evaluate employment effects higher than the income effects from resort-related development. (2) Pollution, forest demolition, general price increase, and traffic congestions are more serious than ever reported. (3) Willingness to participate in resort development is high, but is discouraged by the lack of regional capital. Based on these findings, we suggest some future directions of tourist industry: (1) blocking the leakage of income produced in tourist and tourist industry, (2) connection between fishery and tourist industry, (3) development of tourist route, and (4) administrative reshuffling that helps joint development between private and public sectors.

• Fisheries and Aquatic Sciences
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• 제3권1호
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• pp.37-43
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• 2000

We used a mammalian GnRH antagonist, $[Ac-3,4-dehydro-Pro^1,\;D-p-F-Phe^2,\;D-Trp^{3.6}]$-GnRH, to examine the details of the salmon type gonadotropin-releasing hormone (sGnRH) and GnRH agonist analog $(Des-Gly^{10}$[d-Ala^6]-ethylamide GnRH; GnRHa) functions in the control of maturational gonadotropin (GTH II) secretion, in precocious male rainbow trout, in both in vivo and in vitro experiments. In the in vivo study, plasma GTH II levels increased by sGnRH or GnRHa treatment, but the response was more rapid and stronger in the GnRHa treatment group. The increase in GTH II was significantly suppressed by the GnRH antagonist, while the antagonist had no effect on basal GTH II levels in both groups. The GnRH antagonist showed stronger suppression of GTH II levels in the sGnRH treatment fish than in the GnRHa treatment fish. In addition, plasma androgenic steroid hormones (testosterone and 11-ketotestosterone) increased by the sGnRH or GnRHa treatment. The GnRH antagonist significantly inhibited the increases in plasma androgenic steroid hormone levels stimulated by the sGnRH or GnRHa, while the antagonist had no effect on basal androgenic steroid hormone levels in both groups. In the in vitro study, treatment with sGnRH or GnRHa increased GTH II release from the cultured dispersed pituitary cells, but the response was stronger in the GnRHa treatment group. The increase in GTH II release by GnRH was suppressed by adding the GnRH antagonist, dose­dependently. On the other hand, basal release of GTH II did not decrease by the GnRH antagonist treatment in both groups. These results suggest that the GnRH antagonist, $[Ac-3,4-dehydro-Pro^1,\;D-p-F-Phe^2,\;D-Trp^{3.6}]-GnRH$, used in this study is effective in blocking the action of GnRH-induced GTH II release from the pituitary gland both in vivo and in vitro.

• 생태와환경
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• 제55권1호
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• pp.49-59
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• 2022

배수갑문의 설치가 하구 환경 및 어류군집에 미치는 영향을 파악하고 분석하기 위해 국내에 위치한 총 325개의 하구를 대상으로 2016년부터 2018년까지 조사를 실시하였다. 닫힌하구와 열린하구의 전반적인 어류군집은 차이가 있는 것으로 확인되었으며, 닫힌하구에서는 일차담수어류, 열린하구에서는 기수성 어류와 회유성 어류의 상대풍부도가 높게 나타났다. 해역별로 닫힌하구와 열린하구의 어류를 서식특성별로 구분한 결과에서 남해와 서해는 유사한 경향성을 나타냈으며, 닫힌하구에서 일차담수어류 비율이 가장 높고 열린하구에서는 기수성 어류의 비율이 가장 높으나, 동해에서는 닫힌하구와 열린하구 모두에서 기수성 어류와 회유성 어류의 비율이 높았다. 일차담수어류의 경우 염분에 대한 내성이 없거나 낮은 염분 내성 범위를 가지기 때문에 해수의 순환이 차단되어 염분농도가 낮아진 닫힌하구에서 높은 비율로 나타난다. 그러나, 동해의 경우 닫힌하구보다 열린하구에서 일차담수어류의 비율이 높았으며, 이는 동해안 지역의 특성(조차, 모래사주 등)이 반영된 결과로 판단된다. 또한, 하구어류평가지수(KEFAI)는 모든 해역별 열린하구에서 높은 것으로 확인되었으며(T-test, P<0.001), 닫힌하구는 남해, 열린하구는 동해에서 가장 높은 것으로 확인되었다. 해역별로 닫힌하구와 열린하구를 구성하는 어류군집은 모두 통계적으로 유의한 차이를 보였으며(PERMANOVA, East, Pseudo-F =3.0198, P =0.002; South, Pseudo-F =22.00, P=0.001; West, Pseudo-F=14.067, P=0.001), 해역별 어류군집 유사도에서도 동해, 남해, 서해의 닫힌하구와 열린하구의 어류군집이 뚜렷하게 차이남을 확인하였다(SIMPER, Group dissimilarity, 85.85%, 88.36%, 88.05%). 본 연구는 전국 하구의 유형에 따른 어류군집 특성 및 분포에 대한 정보를 제공하였다. 본 연구 결과는 향후 하구의 관리와 복원에 있어 해역 및 유형에 따라 적절한 관리방안을 수립하는 데에 활용될 수 있다.

• 지역사회간호학회지
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• 제11권1호
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• pp.262-277
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• 2000

In order to find out the sex- and age-related prevalence rate of allergic diseases in the community. as well as the causes of those diseases. questionnaires were given to 2.415 subjects (1.206 males and 1.209 females) from May to June. 1998. As a second stage. skin tests were given to 452 of the original subjects between July and August. 1998. Finally. from March to November 1999. the results of the tests were compared with those of other countries to make a comparative analysis of epidemiological research on allergic diseases. The results of this study were as follows: The frequency of allergic symptoms by sex was 50.1% in males and 56.7% in females. respectively, which displayed significant difference between males and females(p<.01). By age, the frequency of allergic symptoms in males was highest for those under the age of 9 at 60.6%, whereas in females the highest frequency was between the ages of 30 to 39 at 75.1 %. The relationship between economic level of the subjects and their frequency of allergic diseases showed significant difference (P<.05). There was a high degree of correlation between family history and the frequency of allergic diseases(P<.01). In allergic symptoms, the highest prevalence in both males and females occurred with urticaria, itch and skin rash (33.6% with males and 38.0% with females). Rhinitis, nasal blocking and sneezing had the second highest frequency in both sexes (11.8% of males and 14.0% of females). With regard to the causes of allergic symptoms among the people with allergies, the rate in males was 30.1% in food. 25.0% in pollen, and among females the rate was 30.7% in food, 26.6% in pollen. The frequency of food allergies by sex was 25.6% in males and 25.8% in females, with little difference between males and females, and by age, males of the ages between 40 to 49 and females of the ages between 30 and 39 showed the highest frequency, 31.8% and 32.6% respectively. Among 585 people with food allergies, the sympoms occurring with the allergy in males were 81.5% with urticaria, itch and skin rash. 5.9% with diarrhea and stomachache, and 5.2% with rhinitis, nasal blocking and sneezing. Among females with food allergies, the symptoms were 82.6% with urticaria, itch, skin rash, 9.1% with diarrhea and stomachache, and 4.7% with rhinitis, nasal blocking and sneezing. The type of food most often causing allergy in males was mackerel (6.6%) and females peaches (7.4%). In respect to a positive rate in the skin test by sex, of the 379 males taking the skin test, 21.4% were positive for allergies, whereas 14.7% of the 346 females tested were positive. Among food items found to cause positive allergic reactions, hops had the highest frequency in males (58.9%) and whole eggs had the greatest effect on females (36.4%). The estimated prevalence of food allergies in terms of skin tests was 5.0% of 1.206 males and 3.6% of 1.209 females. In the estimated frequency of food allergy by age group, males of the ages between 40 and 49 and females of the ages from 30 to 39 had the highest rate (6.5% with males and 4.5% with females). In a comparative analysis of epidemiological research on allergic diseases by country group, allergic diseases occurred in 18-50% of each population studied, and the occurrence of allergic diseases when categorized according to symptoms displayed the following as such: allergic rhinitis (3.8-52%), allergic asthma (1.6-17%), and atopy dermatitis (0.33-20.4%). The prevalence of food-related allergies was 6.6-64.9% and the foods causing allergies frequently included milk, eggs, eggs, peanuts, fish, etc.