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한현섭,조상만 한국패류학회 2013 The Korean Journal of Malacology Vol.29 No.1
We investigated the growth performance of oysters (initial shell height 57.5 ± 8.5 mm) under differing conditions of tidal exposure time and culture rack height in an experiment that commenced in April, 2011. Significant differences were observed in shell height from June 2011, in total weight from August, and in meat weight from September. Fatness tended to decrease during the experimental period, but was not significantly different at the end of the experiment. Significant differences in survival rates were mainly observed from June to August. After September, further changes were not observed in any experimental treatment group. The greatest growth potential (L∞) and survival rate were observed at a sea level of approximately 116 cm. The results indicate that in the study area the use of oyster culture conditions involving 1 or 2 h of tidal exposure and 6070 cm rack height could result in oysters reaching the favored commercial half shell size within 14 months, with > 80% survival.
한현섭 한국발생생물학회 2000 발생과 생식 Vol.4 No.2
생리적 형질인 수온과 염분에 대한 내성을 양적 형질로 개발하기 위하여 은어의 정상 발생 2배체 (2N-cont),극체형 2배체 (meiotic-G2N), 난할형 2배체 (mitotic-G2N) 및 2종류의 clone (clone-11, clone-15)의 부화 자어를 대상으로 유전적 변이성을 조사했다. 수온은 19. 22.5, 25. 그리고 30.로 설정하였고 각 수온구에 0, 15 및 30의 염분구를 조합하여 12개의 실험구를 만들어 조사했다. 평균 In this study, genetic variation in the 5 strains of 2N-cont, meiotic-G2N, mitotic-G2N and two types of clones with different genetic backgrounds was investigated by developing their tolerance to water temperature and salinity, which is a physiological trait, into a quantitative trait. The temperature was set at 19, 22.5, 25 and 30, each of which was combined with 0, 15 and 30 of salinity respectively, making 12 groups in all. In the mean survival time (MST), samples with 15 of salinity showed the longest survival time at all temperatures. The 2N-cont had the longest 126.16 h followed by clone-11 and clone-15 surviving for 113.22 h and 91.05 h respectively. Gynogenetic diploids showed the shortest 87,32 h and 36.56 h. At 22.5 and 25, MST of each strain was significantly short, showing similar results to those of the groups at 19. The 2N-cont had the longest MST while clones had a longer MST than gynogenetic diploids. This could be due to gynogenesis which causes homozygosis among malignant harmful genes, leading to its appearance in populations and resulting in early death in individuals with such genes. On the other hand, MST of clones was longer than that of gynogenetic fish. This could be because the 1st gynogenetic generation, which is a parental population, has already had its malignant genes removed, while the clones of the 2nd gynogenetic generation have had their superior genes fixed as well as their tolerance and survival improved. When temperature was raised to 22.5 and 25, increase in variation was observed in gynogenetic diploids and decrease in clones in 15 of salinity. This shows that such a trait is genetic to a certain extent. Consequently, if this character is developed into a quantitative trait and applied to selective breeding, it could be a useful character to secure superior strains and individuals, and also it would be possible to improve populations genetically through selection.
한현섭,남보혜,강정하,김이경,지영주,허영백,윤문근 한국수산과학회 2012 Fisheries and Aquatic Sciences Vol.15 No.2
We used nine microsatellite DNA markers to estimate genetic variation among wild and cultured populations of the sea squirt Halocynthia roretzi. The loci were polymorphic, with 6-32 alleles, and allelic richness ranged from 6.0 to 26.1 in each population. The wild and the cultured populations had similar mean heterozygosities (HO and HE), allele numbers, and allelic richness. One cultured population with softness syndrome had a lower mean in the observed heterozygosity (HO = 0.57) and higher mean inbreeding coefficient (FIS = 0.261) than any other populations. This suggests that the loss of genetic variation in the diseased population might be due to increased inbreeding. A neighbor-joining tree and pairwise population estimates of FST showed moderate genetic differentiation between the wild and the cultured populations. Additionally, the softness syndrome population was genetically divergent from wild populations, but it was genetically close to the cultured populations.
제주지역 넙치(Paralichthys olivaceus) 양식업의 경제성 분석: 배합사료 공급 양식어가를 중심으로
김남리,한현섭,이승한,김강웅,김도훈 한국수산과학회 2022 한국수산과학회지 Vol.55 No.5
The government has implemented a policy to promote the use of extruded pellets in sustainable aquaculture by protecting fishery resources and managing the ocean environment. A survey on the production status and the cost of targeting olive flounder Paralichthys olivaceus culture farms in Jeju Island using extruded pellets was conducted. The survey results were used to examine the profitability and economic feasibility of the test farms, as well as the degree of increase in profitability and economic feasibility of the fish farms receiving government subsidies for employing extruded pellets. The economic feasibility was predicted through a sensitivity analysis of prices and production, which are the variable factors when of using the extruded pellets. Using the economic feasibility analysis, the average NPV (Net Present Value) and IRR (Internal Rate of Return) of sample farms were found to be KRW 5.8 billion and 8.9%, respectively. The result of the economic feasibility analysis of the government subsidy showed a maximum average of about 2.3 times higher NPV and a 3.8% increase in IRR in cases where government subsidies were received.
사회경제적 지위와 삶의 만족도: 환경 내 지각된 경쟁성의 조절 효과
김다은,한현섭,김희원,이초원,유민서,윤이재,조혜린,이화령,신지은 한국사회및성격심리학회 2024 한국심리학회지 사회 및 성격 Vol.38 No.2
지위 추구는 인간의 근본적인 동기 중 하나다. 따라서 사회경제적 지위가 높은 사람일수록 대체로 자신의 삶을 더 긍정적으로 평가하며 이에 만족하는 경향이 있다. 이러한 현상의 주요 원인으로는 교육, 의료, 재정적 자원 등에 대한 높은 접근성을 들 수 있다. 즉, 지위는 개인의 번영에 필요한 다양한 자원에 대한 기회와 영향력을 확대하는 수단이 된다는 것이다. 이는 높은 지위의 이점이 자원을 둘러싼 경쟁이 치열할 때 더욱 두드러지게 나타날 수 있음을 의미한다. 따라서 본 연구는 사회경제적 지위와 삶의 만족도 간 관련성이 지위의 이점이 두드러지는 환경, 즉 경쟁 강도가 높은 환경에 속한 개인에게서 더 강하게 나타날 것이라고 가정하였다. 총 2개의 연구를 실시한 결과, 예상대로 자신이 속한 환경을 경쟁적이라고 여기는 사람일수록 사회경제적 지위가 높을 때 자신의 삶을 더 긍정적으로 평가하는 모습을 보였다. 그리고 이러한 현상은 한국인(연구 1)과 미국인(연구 2) 참가자 모두에게서 일관적으로 나타났다. 본 연구는 사회경제적 지위의 심리적 혜택이 그것의 환경 내 가치 및 유용성에 달려있음을 보여줌으로써 지위의 기능에 관한 선행 연구를 뒷받침해 준다. Seeking status is a fundamental human motive. Therefore, individuals with higher socioeconomic status (SES) generally report greater life satisfaction. A key factor contributing to this phenomenon includes increased accessibility to resources such as education, healthcare, and financial assets. Given that status serves as a means to expand opportunities and influence over essential resources for individual functioning and prosperity, it is presumed that this becomes particularly evident in environments with intense competition for resources. This study posited that the correlation between SES and life satisfaction would be more pronounced in individuals experiencing a heightened competitive environment, where the benefits of a higher status are accentuated. Two separate studies were conducted, confirming this hypothesis. Individuals perceiving their environment as more competitive evaluated their lives more positively when possessing higher SES. This phenomenon was consistent among participants in both South Korea (Study 1) and the United States (Study 2). By demonstrating that the psychological benefits of SES hinge on the perceived competitiveness of one’s environment, this study lends support to prior research on the functions of status.