• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.10a
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• pp.258-259
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• 2000

최근 감소 추세에 있는 연안수산자원을 인위적으로 증가시키기 위해서 유용생물의 치어를 생산하여 방류를 통해 수산자원을 증가시키고자 노력하고 있다. 인공종묘를 방류하여 자연자원을 증가시키려는 경우, 고려해야 할 요소가 많지만, 그 중에서도 먹이환경은 치자어의 방류 후 생잔율을 결정하는 중요한 변수가 될 수 있다(광전ㆍ 야구, 1986ㆍ1988). 따라서 방류를 통해 수산자원을 효과적으로 증가시키기 위해서는 어린 시기의 먹이 환경에 대한 많은 연구가 필요하다. 본 연구는 치자어의 성육장이 되는 연안 쇄파대에서의 먹이생물이 되는 갑각류의 분포에 관해 조사하였다. (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.459-460
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• 2001

게류의 유생에 관한 수온, 염분 및 먹 이에 관한 연구들의 대부분은 유생의 각 영기에 따른 형태적 특징 등을 중심으로 한 것이며 여러 종류의 먹이를 공급하여 그 효과를 다양하게 조사한 연구는 찾아 보기 어려웠다. 한편, 본종의 자원조성과 종묘생산을 위해서는 먹이에 대한 기초조사가 다양하게 이루어 져야 할 것으로 생각되어 본 연구팀에서 조사하여 발표한 연구결과를 기초로 하여 여러 종류의 자연 및 인공 먹이를 공급하여 여러 가지 먹이에 대한 섭이효과를 조사하였다. (중략)

• Journal of the Korean Society for Marine Environment & Energy
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• v.20 no.2
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• pp.100-106
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• 2017

Artificial upwelling structure has been set up in sea mount. Bottom water can upwelling euphotic zone. Plentiful nutrient included in bottom water could not only enhance primary production but also expect food chain reaction and gathering fish. This study explain flowing features subject to porosity changes according to the material and shape of artificial upwelling structure. As a result, the upward flux is getting decreased while the porosity is increasing. And it figured out when the upward flux was decreased, the downward flux was also decreased. Futhermore, it was confirmed that the best efficiency of upwelling flux was shown up when the porosity was 10% according to the volume of artificial upwelling structure in case of 20% of porosity, it also has a good efficiency in comparison with impermeable artificial upwelling structure. Therefore, to build the artificial upwelling structure, It is encouraged to design it less than 20% of porosity for the best performance.

• Neonatal Medicine
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• v.18 no.2
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• pp.353-358
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• 2011

Purpose: The goal of this study was to compare the efficacy of oral 25% dextrose treatment or/and pacifier for analgesia in healthy newborns during intramuscular injection of a hepatitis B vaccine. Methods: A prospective, randomized, partially blinded, clinical trial was performed in 132 healthy newborns. They were assigned randomly to 4 treatment groups: control group (2 mL distilled water), dextrose group (2 mL 25% dextrose), pacifier group, dextrose+pacifier group (pacifier coating with 25% dextrose) during intramuscular injection of hepatitis B vaccine. For all groups, Neonatal Infant Pain Scale (NIPS), Neonatal Facial Coding System (NFCS), Premature Infant Pain Profile (PIPP) scores were evaluated before the injection, during the injection, and at 2 minutes after the injection. Pain scores were compared among the 4 groups. Results: Maternal and neonatal characteristics were similar among the 4 groups. 25% dextrose treatment led to lower NIPS pain scores during injection (6.4${\pm}$0.9 vs. 5.5${\pm}$1.7, P=0.01) and after injection (1.6${\pm}$2.0 vs. 0.6${\pm}$0.9, P=0.01) and NFCS pain scores after injection (1.5${\pm}$2.3 vs. 0.7${\pm}$0.8, P=0.04) than control group. The number of neonates who feel the pain (indication of scores: NIPS${\geq}$4, NFCS${\geq}$3) decreased (9 (23.1%) vs. 0 (0%), P=0.04 via NIPS, 7 (17.9%) vs. 0 (0%), P=0.02 via NFCS). However, all treatment groups did not decreased PIPP scores, compared with the control group. Conclusion: Oral 25% dextrose is effective than distilled water or using pacifier with or without 25% dextrose in reducing pain during intramuscular injection of hepatitis B vaccinations. Further study based on this preliminary study need about nonpharmacologic management of pain in newborns.

• Journal of Korean Society of Environmental Engineers
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• v.35 no.12
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• pp.953-959
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• 2013

In this study, through the analysis of the growth condition and prey of the largemouth bass, we tried to understand the characteristics of the aquatic animal community depending on the composition and shape of a artificial lake. The evaluation was conducted for Ilsan lake which is one of the largest urban artificial lakes in Korea. Weight gain rate of the Zone III (eco-zone) was more rapid based on the relationship of length and weight of largemouth bass. Total 16 and 9 species of fish were found in each Zone III and Zone I, II (artificial zones), which represented significantly higher diversity of fish species in Zone III than Zone I, II. Index of relative importance(IRI) was more diverse at Zone III and when considering the hunger rate the food stress was more serious at Zone I, II. the proportion of the population of fish, Zacco platypus revealed to be the dominant species, and Squalidus gracilis majimae and Rhinogobius brunneus inhabited only Zone III naturally rich. On account of low prey species diversity of Zone I, II, the Phylum Arthropoda like Heteroptera showed relatively higher prey ratio in stomach of largemouth bass than that of Zone III. It was possible to figure out aquatic animal community characteristics indirectly through analyzing the stomach contents of largemouth bass.

• Journal of Aquaculture
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• v.7 no.2
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• pp.109-122
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• 1994

The cultured olive flounder larvae given nutrient enriched rotifer, Artemia nauplii and commertial micro diet were investigated the changes of lipid content, fatty acid composition and vitamin E content in whole body with growth stages in order to compare with those of the wild one. The results obtained are as follows. 1) Lipid and vitamin E contents of the cultured larvae were higher than those of the wild one. 2) Clear differences of fatty acid composition with growth stages, especially 18: 2n-6 and 22 : 6n-3, were recognized between the wild and cultured olive flounder larvae. 3) Changes of lipid content, fatty acid composition and vitamin E content were found to be affected by dietary composition given to fish. 4) The wild olive flounder larvae were found to obtain natural live foods containing of low lipid content and high concentration 22: 6n-3 based on the fatty acid composition of the fish.

• Korean journal of applied entomology
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• v.41 no.2
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• pp.85-89
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• 2002

Development and reproduction of the rice armyworm, Pseudaletia separara, were investigated on different diets (corn leaf, rice leaf, Chinese cabbage leaf, cabbage leaf, sweetpotato leaf, soybean leaf and silkworm artificial diet). Egg and pupal periods were not different among the diets. But larval periods showed significant difference among diets. Developmental period from egg to adult was shortest as 32.5 d on corn leaf and longest as 46.6 d on soybean leaf. At 16 days after hatching, larval weights on rice and silkworm artificial diet were heavier than those on other diets. The larvae reared on cabbage leaf and sweetpotato leaf failed to pupate. Survival rates from larva to adult were highest (70.6%) on com leaf lowest (39.8%) on soybean leaf. The longevity of female adults was not affected by the larval diets. Female adults showed higher fecundity when the larvae were fed with corn leaf, rice leaf and silkworm artificial diet than other diets. Net reproduction rate (R$_{0}$) was highest as 1218.5 on silkworm artificial diet. The intrinsic rate of natural increase (R$_{0}$) ranged from 0.115 to 0.175, and was maximum on com leaf.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.35 no.8
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• pp.847-853
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• 2011

Filiform hairs that respond to movements of the surrounding medium are the mechanoreceptors commonly found in arthropods and vertebrates. The hairs function as a sensory system for perceiving information produced by prey, predators, or conspecifics. A mathematical model is proposed, and the parametric analyses for the response of artificial filiform hair are conducted to design and predict the performance of a microfabricated device. The results for the Cytop hair, one of the most popular polymer optical fibers (POFs), show that the fundamental mode has a dominant effect on the hair behavior in an oscillating medium flow. The dynamic behavior of sensory hair is also dependent on the physical dimensions such as length and diameter. It is found that the artificial hair with a high elastic modulus does not show a resonance in the biologically important frequency range.

• Korean Journal of Environmental Agriculture
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• v.14 no.1
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• pp.82-87
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• 1995

The standardization of test procedures and reproducibility of the toxicity data are prerequisite for the toxicity testing with the earthworm culturing in the laboratory. No in-depth study on culturing conditions of earthworms has been conducted in Korea, even of massive cultural practice is common for composting and production of biochemicals. The earthworms, Lumbricus rubellus and Eisenia foetida, were cultured in three kinds of artificial soil substrates(I, II and III) based on the OECD Guideline, which consist of different ratios of components (sand, sphagnum peat and kaolinite), and fed with a mixture of grain powders. During the period of culturing, the body weight and reproduction parameters were measured. L. rubellus showed the best results for increasing body weight and cocoon production in the artificial soil substrate(I) compared with E. foetida. The cocoon production was significantly high in both species cultured in the artificial soil substrate(I) among the three kinds of soil substrates, but the cumulative cocoon production of L. rubellus was 11 cocoon per worm compared with 3.7 cocoons per worm of E.foetida. L. rubellus, therefore, was more prolific than E. foetida in these culture schemes. The cumulative mortality in both species was less than 10%, and the number of juvenile worms per cocoon ranged from 1.5 to 2.3 and thus did not show any relationships with soil substrates or species. From these data, the culture of L. rubellus in the laboratory could be standardized, but for E. foetida, further study would be necessary to establish the optimal growth conditions in the laboratory.

• Korean journal of applied entomology
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• v.50 no.1
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• pp.55-63
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• 2011

This study was conducted to develop an artificial diet for the mugwort looper, Ascotis selenaria (Lepidoptera: Geometridae), which is an insect pest to leaves of citrus (Citrus unshiu). Corn and soybean powder were selected as main nutrient sources for larvae of A. selenaria after several diets consisted of wheat germ, corn, kidney bean and/or soybean were tested for larval development and survival. A higher amount of the main nutrients in the diet increased the larval survivorship. Addition of yeast and cholesterol in diet increased the larval survivorship. Finally the composition of diet was decided as followings; corn 100 g, soybean 100 g agar 25 g, Brewers' yeast 30 g, cholesterol 0.5 g, Vanderzant vitamin mixture 2 g, Wesson's salt mixture 2 g, sorbic acid 2 g, ascorbic acid 2 g, and methyl-4-hydroxybenzoate 2.5 g, and distilled water 1 liter. Development periods of larvae and pupae, survival rate and fecundity of A. selenaria reared on the diet were not significantly different with those on the host plant, citrus leaves. Larvae of early instars were reared in a group, while larvae of later instars (5-6th) were reared individually. Adult mating was conducted in a plastic cage and an oilpaper covered with a gauze was provided as an oviposition site.