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하천변의 식생분포에 관한 연구 : 곡교천을 사례로 Case Study for Goggyochun
조해용 선문대학교 ·중소기업기술지원연구소 1999 선문공대 연구/기술 논문집 Vol.4 No.1
본 연구는 곡교천 주변 식물들의 분포구조를 조사하고 식물분포와 환경요인과의 상호관계를 조사하였다 1998년 8월부터 10월까지 총 11개 조사지점을 곡교천을 따라 선정하여 식물분포구조와 토양환경요인들을 결정하였다 습지식물들이 44종으로 구성되었다 조사지점에서 가장 빈번하게 채취된 종들은 미국개기장, 소리쟁이, 쑥, 환삼덩굴 그리고 바램이였다 그 중 큰개여뀌와 환삼덩굴종이 군집내에서 우점종으로 나타났다 토양분석결과 유기물의 함량과 점토의 성분이 상류지역에서 높고 반면 모래의 성분은 하류지역에서 높게 나타났다 This study was conducted to investigate the distribution pattern of plants on streamside of Goggyochun, and to determine the relationships between plant distribution and environmental factors A total of 1 1 survey sites were selected along the Goggyochun during the period of between August and October 1998, and vegetation distribution pattern and soil environmental factors were determined The wet land plants were composed of 44 species The most frequently occurring species in the study sites were Panicum dichotomiflorum, Rumex crispus, Arternisia princeps var orientalis, Humulus japonicus and Digitaria sarguimalis, and among them the persicaria nodosa and Humlus japonicus species were dominants of the community. Analysis of soil properties showed that organic matter and clay content were higher in the upstream region while sand content was higher in the downstream region.
조해용,박인기,이종신 ( Hae Yong Cho,In Gi Park,Jong Shin Lee ) 충북대학교 산업과학기술연구소 1996 산업과학기술연구 논문집 Vol.10 No.1
Abstract_Roman This paper describes forging of circular toothed gears as a series of development of simulator for non-axisymmetric parts. Kinematically admissible velocity fields for forging of circular gear have been proposed. The half pitch of gear has
조해용 선문대학교ㆍ중소기업기술지원연구소 2000 선문공대 연구/기술 논문집 Vol.5 No.1
곡교천의 9개지점을 1999년 4월부터 7월까지 수생 및 습생관속식물의 종조성, 분포 및 식물군락의 구조를 조사하였다. 조사지역에 분포하는 수생식물은 27과 68속 83종 14변종 1아종 2품종이었다. 조사지점에서 가장 빈번하게 채취된 종들은 미국개기장, 소리쟁이, 쑥, 환삼덩굴 그리고 바랭이였다. 그 중 큰개여뀌와 환삼덩굴이 군집네에서 우점종으로 나타났다. 군집의 종다양성도지수는 0.806-1.148이고, E지점이 가장 높았다. 균등도는 0.504-0.841이고. 군집유사도지수는 0.181-0.800으로 나타났으며, E지점과 G지점과의 상관관계에서 가장 높았다. The flora, vegetation structure, distribution of the vascular hydrophytes and hygrophytes were investigated in the nine sites of Goggyochun from April to July in 1999. The flore was composed of 27 families, 68 genera, 83 species, 1 subspecies, 14 varieties and 2 forms. The most frequently ocurring species in the study sites were Panicum dichotomiflorum, ??umex crispus, Arternisia princeps var. orientalis, Humulus japonicus and Digitaria sarguimalis, and among them the ??ersicaria nodosa and Humlus japonicus species were dominants of the communitγ. The ranges of species diversity indices (H') were 0.806-1.148. It was highest in the site E which was the disturbed area. The ranges of equitabilitγ were .504-0.841. The ranges of community similarity indices (CC_s) were 0.181-0.800 among the nine sites, and hiBhest between ite E and site G.
조해용,정석영,김명한,조창용,이제훈,서정 한국레이저가공학회 2001 한국레이저가공학회지 Vol.4 No.1
Simulation on the electron beam welding of Al 2219 alloy was carried out by using commercial FEM code MARC, which encounters moving heat sources. Due to axisymmetry of geometry, a half of the cylinder was simulated. A coupled thermo-mechanical analysis was carried out and subroutine for heat flux was substituted in the program. The material properties such as specific heat, heat transfer coefficient and thermal expansion coefficient were given as a function of temperature and the latent heat associated with a given temperature range is considered. As a result, the proper beam power is 60kVX60mA and welding speed is 1~1.5 m/min. The residual stress in the heat-affected zone as well as the fusion zone does not increase. It is necessary to use jigs for preventing distortion of cylinder and improving weld quality.
유리섬유 강화 플라스틱과 알루미늄 합금 접합을 위한 유한요소해석
조해용,김동범,Cho, Hae-Yong,Kim, Dongbum 대한용접접합학회 2015 대한용접·접합학회지 Vol.33 No.2
Self-piercing rivet(SPR) is mechanical joining methods and which can be joining dissimilar materials. Unlike conventional riveting, SPR also needs no pre-drilled holes. During plastically deformation, SPR pierces upper sheet and joins it to under sheet. SPR has been mainly applied to the joining the automobile body and some materials, such as glass fiber reinforced polymer and aluminum alloy, which represent the sheet-formed materials for lightweight automobile. Glass fiber reinforced plastic(GFRP) has been considered as a partial application of the automobile body which is lighter than steels and stronger than aluminium alloys. It is needed SPR to join Al alloy sheets and GFRP ones. In this paper, in order to design the rivet and anvil, which are suitable for GFRP, the joinability was examined through simulations of SPR joining between GFRP and Al alloy sheets. For this study, AutoCAD was used for the modeling and the simulated using commercial FEM code DEFORM-2D. The simulated results for SPR process joining between GFRP and Al alloys were confirmed by the same conditions as experimental trials.
조해용,최종웅,이상준 ( Hae Yong Cho,Jong Ung Choi,Sang Jun Lee ) 충북대학교 산업과학기술연구소 1995 산업과학기술연구 논문집 Vol.9 No.2
Abstract_Roman The upper bound method utilizing neutral surface is applied newly to trapezoidal spline and serration with purpose to verify that the using of neutral surface is useful for prediction of load and inner flow of material of gear-like compone
조해용 선문대학교 1998 공과대학논문집 Vol.1 No.1
하천개발이 하천의 생태계에 미치는 영향을 알아보기 위해 무한천과 곡교천의 식생구조와 관리를 조사 하였다. 무한천은 건강한 생태계를 유지하고 있어, 하천에서 각종 휴양활동을 하기에 충분했다. 그 이유는 습지 식물이 지천으로부터 영양분을 흡수하여 하천의 생태계를 건강하게 보존토록 하기 때문이다. 습지식물은 상류로부터 하류로 갈수록 증가하며, 상류에는 수많은 수목과 습지식물이 나타난다. 그러나 하천의 개발지역인 중류에 는 미국가막사리, 미국개기장과 같은 귀화식물이 우점종을 이룬다. 하천의 생태계를 보존하기 위해서는 하천개발후의 자정작용을 위해 습지식물이 부분적으로 도입되어야 하며, 아울러 지속적인 관리가 요구되어진다. To investigate the impact that the river development effects the river ecosystem, plants ecosystem and structure in Muhanchun and Goggyochun were surveyed. Muhanchun maintains the sound ecosystem. It has sufficient capacity for recreation-activities on the river. The reason is that a hydrophyte absorbs nutrients from the stream and the river ecosystem maintains sound. Number of hydrophyte increase from upstream going forward to downstream. In the upstream various woody plants and hydrophyte appeared. But at midstream, which is the developed area, naturalized plants dominate such as Bidens frondosa, Panicum dichotomiflorum etc. To manage the creek ecologically, hydrophytes should be introduced in partly, for natural purification after rehabilitation of the riverside, and steadily monitoring is demanded.