• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.36 no.9
• /
• pp.835-840
• /
• 2008

We investigate the aerodynamic performance of the dragonfly wing which has the cross-sectional corrugation by using the static 2-dimensional unsteady simulation. Computational condition is at Re=150, 1400 and 10,000 with the angles of attack from 0 to 40 degrees. As computational results, the increment of the lift coefficient by corrugation is nearly constant over the critical angle of attack. Also, upper side corrugation of the wing have very little influence on increase of the lift coefficient.

• Korean Journal of Ichthyology
• /
• v.33 no.2
• /
• pp.84-94
• /
• 2021

This study was conducted to elucidate the impact of invasive species, Micropterus salmoides and Lepomis macrochirus in Geumgyeji, Samgaji and Naejangji reservoirs of National Parks, Korea in 2020. In the Geumgyeji, 1,221 individuals of 11 species in 7 families were collected including M. salmoides (relative abundance, 96.3%) and L. macrochirus (0.3%), M. salmoides fed mainly on Rhinogobius brunneus (IRI, 37.2%), Odonata (25.6%), Megaloptera (11.6%), and M. salmoides (7.0%). In the results of Samgaji showed that 854 individuals of 10 species in 5 families were collected including M. salmoides (60.8%), and M. salmoides fed mainly on Decapoda (shrimp, 33.6%), Odonata (34.4%), R. brunneus (21.2%), and Zacco platypus (6.1%). In the Naejangji showed that 1,075 individuals of 13 species belonging to 7 families were collected including L. macrochirus (38.1%) and M. salmoides (9.5%), and L. macrochirus fed mainly on Branchiopoda (77.5%), Diptera (9.8%), Decapoda (4.0%) and M. salmoides fed mainly on R. brunneus (73.3%), Decapoda (21.2%). M. salmoides of Geumgyeji and Samgaji were apparently introduced more than a 10 years ago. The fish population declined rapidly since the introduction of M. salmoides. L. macrochirus of Naejangji was introduced more than 20 years ago, which increased its relative abundance to 40%. M. salmoides was introduced five to six years ago, and the fish species and population declined rapidly since the introduction of M. salmoides. Finally, we discussed the inhabitat status and management of M. salmoides and L. macrochirus in the National Park.

• The Magazine of Kiice
• /
• v.5 no.1
• /
• pp.57-64
• /
• 2004

홈 네트워킹(home networking)이란 용어는 가정(home)과 장비들 간의 통신이 가능하도록 하는 망구성(networking)이란 두 가지 용어가 합쳐진 말이다. 가정에 있는 모든 장비들을 연결해 서로 통신할 수 있도록 함으로써, 가족 구성원이 현재 위치에 관계없이(가정 내의 위치 또는 가정 밖의 위치에 무관하게) 가정 내 장비를 제어하거나 통신할 수 있도록 해주는 기술이다. 예를 들어, 거실에 앉아서 잠자리에 든 아이들 방의 불을 끈다거나, 외출하다가 도시 가스 밸브를 열어놓은 것이 생각나면 휴대폰으로 가스차단기를 작동시키는 등 일상생활에 즉시 적용할 수 있는 기술이다[1]. (중략)

• Korean journal of applied entomology
• /
• v.51 no.2
• /
• pp.111-129
• /
• 2012

Terrestrial insect fauna was surveyed in the Junam wetland area, which consists of the Junam, Dongpan, and Sannam wetlands, by visual counting and pictures. A sweep net collection was conducted from May to October 2010. A neighburing artificial lotus wetland was also surveyed for comparison. A total of 5,730 insects were surveyed, representing 268 species in 85 families and 12 orders. Sixty-three species of coleopterans were surveyed, followed by 60 species of Lepidoptera, and 37 species of Hemiptera. Coleopteran individuals were 25.9% of the total insect numbers surveyed, comprising most abundant group. This was followed by Odonata, Lepidoptera, and Orthoptera at 22.3%, 15.4%, and 12.7%, respectively. In total, 197 species were surveyed in the Dongpan wetland, 175 in the Junam wetland, and 154 species in the Sannam wetlands. However, only 86 species were surveyed in the artificial lotus wetland. Galerucella nipponensis in Coleoptera, Crocothemis servilia mariannae in Odonata, and Polygonia c-aureum in Lepidoptera were the most abundant in all four wetlands. Community analyses showed that the dominance index was highest in the artificial lotus wetland at 0.25 and lowest in Junam wetland at 0.08. Diversity indices were relatively high in all wetlands at 4.48, 4.44, 4.28, and 3.87 in Junam, Dongpan, Sannam, and the artificial lotus wetland, respectively. The insect fauna similarity index was highest in the Junam and Dongpan wetlands at 0.96. The lotus wetland showed the lowest similarity of the three wetlands with values of 0.45-0.53.

• Korean journal of applied entomology
• /
• v.24 no.1 s.62
• /
• pp.34-38
• /
• 1985

Effects of some artificial diets containing pulverized silkworm pupae On the oviposition of a green lacewing, Chrysopa formosa, were studied. The pulverized silkworm pupae with honey seemed to be a good diet for the egg-laying activity of field-collected adults in the beginning of rearing, but their fecundity progressively decreased. Newly emerged adults. did. not lay eggs when fed the above diet, but they were able to lay eggs when the silkworm pupae were defatted and provided with honey. An adult female laid an average of 166.8, 110.2, 96.1, and 66.1 eggs after spending 5, 9, 9, and 11 days for the initiation of oviposition when supplied with various diets i.e. the cabbage aphid, defatted silkworm pupae with additive constituents, mixture of intact and defatted silkworm pupae with additive constituents, and defatted silkworm pupae with honey, respectively.

• Journal of Wetlands Research
• /
• v.2 no.2
• /
• pp.133-146
• /
• 2000

An ecological survey was performed in Miryang dam water system during the period of June 5~6, 2000. The fauna collected from 7 sites consisted of total 67 species, 49 genus, 25 families, in 7 orders of aquatic insects. These included 29 species of Ephemeroptera, 22 species of Trichoptera, 7 species of plecoptera, 6 species of Diptera, 1 species of Megaloptera, Odonata and Coleoptera repectively. The relative abundance of Ephemeroptera, Trichoptera, Plecoptera, Diptera, and Coleoptera was 71 %, 11.2%, 5.1%. 11.9% and 0.6% respectively. The primary dominant species of tatal level was Epeorus aesculus, and second dominant species was Epeorus latifolium. The primary dominant species were Heptagenia kihada at site 1, Ecdyonurus dracon at site 2,3,4 and Epeorus aesculus at site 5, Epeorus latifolium at site 6,7. Dominance indices were ranged from 0.30 to 0.55, and species diversity indices from 3.11 to 4.25(mean=3.71). Saprobic system based on species diversity indicated that whole sites were oligosaprobic.

• Korean Journal of Plant Taxonomy
• /
• v.35 no.1
• /
• pp.25-46
• /
• 2005

External morphology focusing on the flower structure of Korean Platanthera was examined. The genus Tulotis was included to the genus Plathanthera as previously suggested by many workers, because the diagnostic character to distinguish the two genera was not distinct enough. It is revealed that the taxon previously recognized as P. metabifolia was the misidentification of P. chlorantha and P. neglecta should be treated as a distinct species from P. mandarinorum. In result, Korean Platanthera were rearranged into 8 species; P. chlorantha, P. mandarinorum, P. neglecta, P. hologlottis, P. japonica, P. ophrydioides, P. ussuriensis, and P. fuscescens. A key to the species of Korean Plathanthera and taxonomic discussion of each species were provided.

• Journal of Wetlands Research
• /
• v.16 no.3
• /
• pp.337-346
• /
• 2014

This study was carried out to investigate the terrestrial diurnal insects in the Donggang river neighborhood. A total of 455 species belonging to 117 families of 16 orders were identified from 3,001 collected terrestrial insects around the Donggang river. Species richness showed as follows; Coleoptera (166 species, 34.48%), Hemiptera (11 species, 24.0%), Lepidoptera (68 species, 14.95%), Diptera (40 species, 8.79%), Hymenoptera (28 species, 6.15%), Orthoptera (18 species, 3.96%), Odonata (7 species, 1.54%), and others (3.74%). The Coleoptera consisted of the most number of individuals (33.2%), followed by 951 Hemiptera (31.7%), 662 Lepidoptera (20.7%), 155 Orthoptera (5.2%), 100 Diptera (3.3%), 87 Hymenoptera (2.9%), 30 Odonata (1.0%) and others (2.0%). Among them, 1 endangered species of Ministry of Environment, 1 Critically Endangered Korean species, 7 Vulnerable Korean species (VU), and also 2 Near Threatened Korean species were surveyed in the Donggang river neighborhood.

• Ecology and Resilient Infrastructure
• /
• v.9 no.1
• /
• pp.15-23
• /
• 2022

This study was conducted to investigate in relation to characteristic of macroinvertebrates in conventional and organic paddy fields. The investigation was conducted five times a year for Suwon, Ansung, Boeun, Gunsan, Gimje, Hamyang, divide into conventional paddy fields and organic paddy fields from 2009 to 2011. The macroinvertebrates collected from the surveyed between conventional and organic paddy fields belonged to 84 species, 47 families, 16 orders, and 6 classes in 3 phyla. In the habitat orientied groups, climbers, swimmers and sprawlers were considerably occupied in conventional and organic paddy fields. In relation to the functional feeding groups, predators such as Odonata, Coleoptera, and Hemiptera were only the highest in paddy field ecosystem, regardless of cultivation method. As a result of community stability analysis, orgainc paddy fields has been identified much as species high resistance and resilience to environmental change in paddy field ecosystem. Species belonging to the I groups is considered to be important in organic paddy field such as Sternolophus rufipes, Hydrochara affinis, Helochares nipponicus, which has high mobility. In conclusion, it was found that the introduction of coleoptera as a food source was higher than that of conventional paddy fields in organic paddy field where primary consumers were abundant such as Chironomidae spp. and Dixidae sp..

• JOURNAL OF ELECTRICAL WORLD
• /
• s.310
• /
• pp.62-66
• /
• 2002

오늘날의 빌딩이나 역사(驛舍)는 쾌적함을 위해 조명설비, 공조설비, 위생설비, 엘리베이터, 에스컬레이터, 방범방재설비, 통신정보설비 등이 잘 정비되어 있으며, 그 기기 모두는 전기로 작동되고 있다. 빌딩이나 교통전원설비의 리뉴얼공사를 하는 데는 어떻게 빌딩과 교통설비의 기능을 정지하지 않고 단기간에 완성하는가가 중요 포인트가 된다. 미쓰비시(삼릉)전기 플랜트건설총괄부에서는 고객니즈에 대한 검토뿐만 아니라 주변지역에 주는 영향도 충분히 조사하여 빌딩이나 철도 역사에 출입하는 사람들의 안전과 일상생활을 배려한 계획을 세워, 그 시공장소에 적합한 공법 개선과 최적의 기자재 공법을 개발하고 추진하여 안전$\cdot$품질을 충분히 고려한 현지시공을 실시하고 있다. (1) 반입공법 빌딩과 교통시설의 전원설비는 고층이나 지하에 설치되는 일이 많고 건물의 성질상, 전용 반입설비가 확보되어 있지 않는 것이 통상적이다. 동사에서는 고소반입용기기 ''뉴톤밸런스''((1))와 계단용반입기기 ''계단승강기''((2))를 개발하여 단(短)공기로 지역주민이나 빌딩 이용자에게 지장을 주지 않는 공법을 채용하여 높은 평가를 받고 있다. (2) 설치$\cdot$조립공법 건물 내의 작업은 환경을 악화시키지 않는 것이 중요하다. 저소음으로 배기가스를 발생시키지 않도록 ''전동크레인''((3))과 ''돔보(잠자리)크레인''((4))을 채용하고 있다. 또 소음$\cdot$진동을 발생시키지 않는 콘크리트용의 앵커구멍 뚫기장치 ''라구라구(樂樂)드릴''((5))과 앵커타설장치 ''라구라구(樂樂)햄머''((6)) 그리고 앵커강도확인장치 ''라구라구(樂樂)체커''((7)) 등의 기기를 개발하여 작업환경을 향상시켰다. $\divideontimes$ 위의 (1)$\~$(7)과 다음 페이지의 그림 중 (1)$\~$(7)은 대응하고 있다.