• Korean journal of applied entomology
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• v.47 no.3
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• pp.227-235
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• 2008

Development of T. urticae was studied on the leaves of eggplant grown in hydroponics with silica contents of 0 mM, 1.7 mM, and 5.1 mM. As the levels of sllica increased, those of N, P, K, Ca, and Mg decreased and those of Si increased. While contents of calory, crude protein, carbohydrates, and vitamin C decreased, those of ash, fiber, and sugar increased. Biomass and content of cholorophyll decreased as the level of silica increased while leaves became thicker. Laboratory leaf disc tests provided with various silica levels revealed that feeding preference of T. urticae was the highest at 0 mM and the lowest at 1.7 mM. The oviposition preference decreased as the levels of silica increased, on the lower leaf appeared to hinder the feeding and the oviposition of T. urticae. The development slowed down both in female and male. Adult life span of female shortend as the silica level increased and that of male was the longest as 5.7 days at 0mM and the shortest at 1.7 mM. Oviposition period also shortened as the silica content increased. The number of eggs laid was the most as 86.3 at 1.7 mM while average oviposition per day was the least as 77 at 0 mM. No differences in hatchability was detected whereas the ratio of sex was the highest as 0.71 in favor of female at 0mM. $R_o$ and T decreased as the levels of silica increased. Rm and $\lambda$ was the lowest at 5.1 mM while Dt was the longest as 1.8271 at 5.1 mM and the shortest as 1.6991 days at 1.7 mM. Silica content in eggplant turned to affect the development of T. urticae, however, it deterred T. urticae from feeding and oviposition and the rate of increase tended to decrease due to lesser nutrients in the eggplant leaf.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2001.11a
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• pp.435-436
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• 2001

대기 중 에어로졸 입자의 크기 분포를 측정하는 기기 중 광학적 입자 계수기(Optical Particle Counter)는 0.3$\mu\textrm{m}$에서 25$\mu\textrm{m}$ 사이의 입자의 크기를 개개의 입자에 대한 산란광의 강도를 측정하여 그 강도와 미리 정해진 강도와의 관계에 의해 입자의 크기를 추정한다(Chun et al., 2001). 본 연구에서는 2001년 4월 제주 고산에서 실시된 ACE-Asia(Asian Pacific Regional Aerosol Characterization Experiment) 집중 관측 기간 중 광학적 입자 계수기(Optical Particle Counter; HIAC/ROYCO 5230)를 이용하여 측정한 이 기간 중 에어로졸 입자의 크기 분포의 특성을 황사시와 비황사시, 그리고 강수시와 비강수시로 나누고 그 특징을 비교하여 보았다. (중략)

• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.521-521
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• 2017

본 연구는 기후변화가 만경강에 서식하는 어류 서식처에 미치는 영향을 분석하고자 하였다. 기후변화 영향에 따른 수문자료는 RCP 8.5 기후변화시나리오 결과에 기반하여 SLURP 분포형 모델을 이용하여 일 유출량을 도출하였다. 기후변화 전후의 일 유출량 자료는 수문변화지표(indicator of Hydrologic Alteration, IHA) 통계분석모형을 이용하여 유출량의 규모, 빈도, 시기, 기간, 변화율 등 유황특성을 반영한 5가지의 환경흐름요소(Environmental Flow Components, EFC)로 나타냈다. 환경흐름요소는 수문기간 동안의 유황을 극히 낮은 흐름(Extreme low flow), 낮은 흐름(Low flow), 높은 흐름 펄스(High flow pulse), 작은 홍수(Small floods), 커다란 홍수(Large floods) 등 5가지의 스펙트럼 형태로 나타낼 수 있다. 어류의 물리서식처 모의를 위한 대상어종은 환경부 멸종위기 야생동식물 1급으로 지정 및 보호되고 있고 과거 만경강 봉동 일대에서 출현하였던 감돌고기를 선정하였다. 감돌고기의 서식처 적합도(HSI)는 과거 모니터링 결과 및 문헌자료 근거로 생애주기별(산란기, 성장기, 성어기)로 구분하여 나타내었고, River2D 모형에 적용하였다. 분석결과 생애주기별로는 기후변화 영향 후 산란기의 감돌고기의 서식처가중가용면적은 24.1% 증가, 성장기와 성어기의 가중가용면적은 각각 3.3%, 7.3%로 감소하는 것으로 예측되었다. 극한조건에서 서식처가중가용면적의 크기는 높은 흐름 펄스, 작은 홍수, 커다란 홍수, 극히 낮은 흐름 순으로 나타났다. 기후변화 영향으로 인한 가중가용면적의 변화는 작은 홍수를 제외하고 미래에는 감소하는 것으로 나타났으며, 특히 극히 낮은 흐름, 커다란 홍수의 경우 빈도와 기간을 고려할 때 실질적인 가중가용면적은 더욱 악화될 것으로 예측되었다. 이러한 결과를 바탕으로 기후변화 영향으로 인한 만경강 유역의 미래서식처 요건은 악화될 것으로 예상되며 멸종위기종인 감돌고기의 서식처 확보방안의 제시가 필요할 것으로 판단된다.

• Korean Journal of Poultry Science
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• v.42 no.1
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• pp.61-67
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• 2015

The objective of this experiment was to investigate the effect of dietary supplementation of herbal medication (HM) on laying performance, blood parameter, and immune response in laying hens. A total of 800 Hy-Line Brown laying hens of 60 weeks of age were randomly allotted to one of four dietary treatments with four replicates per treatment. Three additional diets were prepared by adding 0.5, 1.0 or 1.5 % of HM to the basal diet. Feeding trial lasted 7 weeks under 16L:8D lighting regimen. The diet and water were available ad libitum. Hen-day egg production in groups fed diets with 0.5% and 1.5% HM was significantly (P<0.05) higher than that of control. Feed conversion ratio in group fed diet with 0.5% HM showed the lowest value (P<0.05). Egg weight, feed intake, broken and shell-less egg production were not affected HM supplementation levels. Egg yolk color was significantly greater in all HM supplemented groups than basal treatment. However, eggshell strength, eggshell thickness, eggshell color, and Haugh units were not affected by HM supplementation level. There were no differences in leukocyte counts among the treatments. Plamsa IgM concentration was (P<0.05) higher in all HM treated groups. In conclusion, dietary HM improved egg production, and IgM of laying hens.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.18 no.3
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• pp.253-261
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• 1985

The reproduction of marbled sole Limanda yokohamae, caught near around the southeastern coast of Korea, from December 1983 to November 1984, was investigated based on such annual variations as gonadosomatic index(GSL), gametogenesis, reproductive cycle, spawning number, hepatosomatic index (HSI), and fatness. GSI began to increase in the autumn season with the onset of shorter day length and colder water temperature, and reached the maximum value in December with the shortest day length and the lowest temperature over the year. The gonad activated the proliferation of oogonia and spermatogonia in June, reached the mature stage in October, ripe in December, and spawning from the end of December to January. After spawning, it showed the resting stage which gonad remained regressive and suppressive from February to May. In addition, the adult individuals observed discharged eggs only once during their spawning period. At yolk globular stage, the substance of vitellogenin synthesized from the liver was considered to participate in the active yolk accumulation of oocytes. Marbled sole was concluded to be a typical winter spawning species in that such environmental factors as short day length and low water temperature were closely related with the gametogenesis, the stimulation of oocyte maturation, and were also affecting the ovulation.

• Korean Journal of Poultry Science
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• v.32 no.4
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• pp.275-279
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• 2005

This study investigated the effect of dried food-waste diets (FW) fermented by Aspergillus oryzae (AEW), on egg Production and egg qualify in laying hens. One hundred sixty eight laying hens, 50 week old, ISA-Brown wtrain were randomly distributed into 7 treatments with 3 relpicates of 8 birds per replicate and fed with standards laying hen diet replaced with FW and AFW at die=rent level Basal Diet, 25, 10, $75\%$, respectively. There was a significant decrease in feed intake for FW $50\%$ diet and egg Production was statistically lower in all W diet treatments(p<0.05). Water consumption was increased as the replacement increased. Egg weight, egg shell thickness and strength were similar among treatments. However, egg yolk color and Haugh unit showed distinct differences when W were added to their diets(p<0.05). No difference was observed in egg yolk cholesterol. It seems that FW diet could decrease the egg Production, but would be able to improve egg Quality. From this results, AO seemed applicable to laying hen diet as supplements.

• Korean Journal of Poultry Science
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• v.29 no.2
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• pp.135-140
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• 2002

An experiment was conducted to determine the effects of vitamin C supplementation on the performance and egg quality of layers. A total of 800 ISA Brown layers of 71 weeks old were assigned to one of the following diets containing 0, 3, 10, 50 or 100 ppm LG-vitamin C, 100ppm free ascorbic acid, 100 ppm Rovimix stay C-35 or 50 ppm LG-vitamin C supplemented with 100 ppm Zn methionine chelate. The feeding trial was conducted for flour weeks during the period of May to June when the average ambient temperature was $23.8^{\circ}C$ (5 :00 PM). Each treatment was replicated five times with 20 birds housed in 2 birds cage units. Vitamin C supplementation did not improve the overall performances (egg Production and egg Quality). Birds fed 100 ppm of LG vitamin C had the lowest egg Production while birds fed 100 ppm of Rovimix-35 had the lowest egg weight among birds fed different sources of vitamin C. Although supplementation of vitamin C over 50 ppm increased soft and broken egg Production, supplementation of 10 ppm LG vitamin C showed lowest soft and broken egg Production among all treatments. E99she11 thickness was highest in the treatment of 50 ppm LG vitamin C. In conclusion, supplementation of vitamin C at the level of 3 ~ 100 ppm did not significantly influence the laying performance and eggshell quality of laying hens under normal ambient(20 ~$26^{\circ}C$ ) condition.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1777_1778
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• 2009

한국수자원공사에서는 1998년부터 단계적으로 12~14 GHz의 Ku-band 대역을 사용하고 있는 무궁화위성을 이용하여 우량 및 수위, 경보 등의 데이터를 송수신하고 있으며, 특히 강우가 집중되는 기간 동안에는 그 데이터의 필요성이 더욱 큰 실정이다. 사용하고 있는 위성통신망 주파수의 파장은 2~2.5 cm 이므로 물방울 입자에 의해 산란되는 특징을 가지고 있으며, 이로 인해 안테나 및 휘드혼의 표면에 물방울이 묻어 있으면 전파가 산란되어 신호가 감쇠되는 특성을 가지고 있다. 따라서 본 연구에서는 강우시 안테나 및 휘드혼 표면에 발생하는 물방울 맺힘 현상에 대해 물방울과 전파신호간의 상관관계를 분석하고, 위성안테나 성능을 개선방안을 시험하여, 강우로 인한 위성신호의 감쇠를 최소화하여, 최적화된 안테나 성능 구현으로 강우 영향을 최소화하여 안정적인 위성단말국을 운영하고자 한다.

• Journal of the Korean Professional Engineers Association
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• v.30 no.1
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• pp.5-15
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• 1997

방사선들 중에서 감마선은 우리의 몸 속을 깊숙이 침투할 수 있다. 그런 감마선이 우리 몸을 투과할 때, 체세표를 이룬 원자들의 궤도전자들과 충돌하면서 소멸된다. 우리는 그런 현상들을 물질과의 상호작용 이라 부른다. 방사선과 물질과의 상호작용은 원자의 단위에서 일어난다. 감마선이 물질과의 상호작용들은 물리적으로는 광전자 산란 효과, 컴프턴 산란 효과 그리고 전자쌍 생성효과 등으로 구분하여 설명된다. 방사선이 우리의 몸 속에서 체세포의 원자와 충돌하여 생기는 자유전자들은 몸 속에 남게 되고, 그들은 몸 속을 상당 기간 동안 배회하면서 인체의 생명 현상을 유지시킬 생화학 작용의 기능들을 약화시키기도 하고, 악성인 암세포들을 만들어내기도 하므로 건강 유지에 불리하게 작용한다. 따라서 감마선에 쪼여 생긴 자유전자들은 우리의 정상적인 건강 조건들을 해치는 주된 요소가 된다.

• The Korean Journal of Zoology
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• v.5 no.1
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• pp.21-29
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• 1962

본논문은 경기도광릉시험장에서 잣나물을 식해하는 잣나무넓적잎벌의 생활사를 1958-1961년에 조사연구한 것을 보고하는 것이다. 본충의 생활사에 대한 연구는 동양에서 아직 보고된 바 없다. 1) 광릉에서는 6월중순부터 7월 하순에 걸쳐서 성충이 출현한다. 생활기간은 성충이 5(웅)-6(자)일, 란이 약 6일, 유충이 약 23일, 전용이 약 10.5개월, 용이 약 8일이다. 2) 산란은 신생침엽의 내측에 행하고, 1자충의 산란수는 38립가량되고, 일란을 산촌하는데 소요되는 시간은 약 3분간이다. 3) 유충은 5령을 경과한다. 유충은 토사에 의하여 침엽을 얽어서 집을 만든다. 이 소내에 보통 1마리의 유충이 서식한다. 4) 유충의 식초는 한국에 있어서는 잣나무뿐이다.