http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
자연친화적 하천공사 기법이 적용된 경천에서의 어류상 변화
이승휘,권은호,이건우 호남대학교산업기술연구소 2008 산업기술연구논문집 Vol.14 No.-
자연친화적 하천공법이 적용된 하천의 어류상의 변화를 확인하고자 전라북도 순창군에 위치한 경천을 대상으로 모니터링을 수행한 결과 6목 10과에 속하는 33종 의 담수어류가 확인되었다. 이 중 한국고유종은 13종 이 었 고 멸종위기야생동물 2종까지 확인되었다. 우점종은 R. uyekii(26.37%), Z.platypus(26.14%), 그리고 C auratus (l9.11%) 으로 확인되었다. 각 조사지점별 어류상의 양상은 수제에서는 어식성 어류인 C herzi의 출현이 우세하였고, 도피 및 은신할 수 있는 공간을 제공하는 공법 적용 구간에서는 소형 어류를 용이하게 확인할 수 있었을 뿐 아니라 이들의 번식 양상까지 파악할 수 있는 하천 내 공간이 됨을 확인할 수 있었다. 하중도와 수제구간은 육식성 어종인 C. herzi와 Oplatycephala 등에게 사냥 및 서식에 유리한 조건을 제공하여 하천 내 생태적 안정성을 갖춰나가는 요인으로 작용하고 있음을 추정 할 수 있었다. In induction of close-to-nature streams construction, the prerequisite things of characters were analysis the hydraulic and careful consideration of environmental effects about related stream for least trial and error subsequently. The freshwater fish fauna were measured at eight close-to-nature streams construction as which wing deflectors, riffle, sediment basins, stone we protection, low flow revetment, stepping stones, side stream, and island in the Kyungcheon periodically. In analysing the ichthyofauna in Kyungcheon, suitable target fish species were Coreoperca herzi in wing deflectors, Coreoleuciscus splendidus in riffle, and Oryzias latipes in sediment basins in consideration that divergent construction of close-to-nature stream built Comparative study of attemptεd to divergent eight kinds of construction of close-to-nature streams through analysing the ichthyofauna in Kyungcheon. Suitable fish habitats were diversity index , evenness, richness, number of capture, number of species, stability of egg laying, and the area of rest as criteria significantly. The close-to-nature streams would be succeed with stream diversity in circumstances considerably.
영산강 치수대책 사업 중 나타난 원촌지구의 어류상 변화
이승휘,이건우,이상동 호남대학교 2008 학술논문집 Vol.29 No.2
This study was accomplished to give a better understanding of a suitable habitat for fish by investigating ichthyofauna. Freshwater fish was found as evidence of disturbance or spontaneous condition of inland water ecosystem. Ichthyofauna were identified with 26 species belonging to 6 families, including eel, carp, crusian carp, steed barbel, goby minnow, korean piscivorous chub, medaka and korean aucha perch in Weonchon. Ichthyofaunal change appeared during project of riparian improvement at the Weonchon in Yeongsan river; Species diversity, evenness and richness were decreased in one year after construction, however, the tendency of increase was comprehended in this region. However, Yeongsan river was polluted more then other larger national rivers in Korea. Yeongsan river keeps its natural environment well preserved and flows throughout the river, and fishes live in their habitat. Species diversity, evenness and richness were decreased in one year after construction. However, increasing biodiversity of fish was in process of preparing suitable habitat for fish of in this region comprehendingly.
어류상을 활용한 영산강 광주도심하천 수계의 생태적 가치고찰
이승휘,이건우,이상동 호남대학교산업기술연구소 2008 산업기술연구논문집 Vol.14 No.-
영산강 수계에서 장기 생태 모니터링 결과 취한 어류상의 변화를 생태학적으로 분석하였다. 조사지점은 영산강 수계 내 7개 공사 지점과 5개 대조지점을 포함하는 127~ 지점으로 삼았다. 조사는 2004년 부터 2007 년 까지 정성, 정량적 조사를 위해 표준화시킨 방법에 따라 각 계절마다 실시하였다. 어류 모니터링 결과 4년 간 확인된 어종은 모두 52종 으로 확인되었다. 이들 중 한국고유종은 16종(30 .8% )이었고잉어목 어류는 34 종(65 .4% ) 이 었 다. 하천생태의 평가를 위해 어류의 종수와 다양도 지수를 포함한 생태계구조를 127~ 지점에서 나타난 어류상 자료에 적용하였다. 그 결과 공사 1년 이후부터 어류상의 화복 경향이 조사구간에서 나타나고 있음을 파악할 수 있었다. The analysis of ecological change of ichthyofauna was achieved with long term monitoring Twelve sampling sites was including five control sites in Yeongsan river. Sampling of fish carried out standardized method of the purpose of qualitative and quantitative investigation from 2004 to 2007 at. each season. Fifty-two species were identified during four years with fish monitoring Sixteen Korean endemic species(30.8%) and thirty-four cyprinids(65.4%) were/including in fifty-two fishes. Applying to the ichthyofaunal data of twelve sires for the purpose of evaluation of riparian ecosystem with species number, diversity index and some other factors. As the result of stream repair, the tendency of ichthyofaunal repair became visible post one year after constructIon in stream.
사파이어 의료용 나이프의 연삭가공에서 지그의 탄성계수가 날 부 형상에 미치는 영향
신건휘(Gun-Hwi Shin),이득우(Deug-Woo Lee),곽태수(Tae-Soo Kwak) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.2
This study focuses on the effect of the elasticity modulus of jig material on blade edge shape in the grinding process of a sapphire medical knife. The ELID grinding process was applied as the edge-grinding method for sapphire material. Carbon steel and copper have been selected as the hard and soft jig materials, respectively. The blade edge created by ELID grinding was measured by a surface roughness tester and optical microscope. The shape of the ground edge and surface roughness were compared using the measurement results. As a result, it was found that chipping in the blade edge of the sapphire knife occurred more than in the case of jig material with a high-elasticity modulus because of the high normal force in the grinding process. Moreover, the maximum height surface roughness, Rmax,of the ground surface was higher in the case of the jig material with a high-elasticity modulus due to the difference in elasticelongation. It was considered to lead to chipping from the notch effect.
사파이어 의료용 나이프의 연삭가공에서 지그의 탄성계수가 날 부 형상에 미치는 영향
신건휘(Gun-Hwi Shin),강병욱(Byung-Ook Kang),곽태수(Tae-Soo Kwak) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.5
This study determines the selection of an appropriate jig material for the blade edge of the medical sapphire knife. The physical properties of the jig material affects the edge shape and chipping phenomenon in machining of the medical sapphire knife. If a grinding wheel is used, brittle workpieces such as sapphire are easily damaged by the propagation of cracks because the grinding force significantly increases. It is important to constantly maintain the grinding force in the grinding process of the brittle materials. The grinding force can be kept constantly by inducing the elastic deformation of the Jig material because the elastic deformation of brittle work-piece is negligibly low. The chipping phenomenon may be reduced by selecting the proper Jig material. Aluminum, copper, stainless steels and carbon steel were used as Jig materials. The experiment was conducted using a cast iron grinding wheel, which was installed on a conventional grinding machine with the ELID grinding system. The thickness and width of the chipping area were measured using an optical microscope and FE-SEM to analyze the shape of the blade edge. According to the experiment result, the chipping phenomenon decreased, and the sharp edge was formed when the jig materials with low elastic modulus were used.