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조해용,최종웅,최선순 ( Hae Yong Cho,Jong Ung Choi,Seon Soon Choi ) 충북대학교 산업과학기술연구소 1995 산업과학기술연구 논문집 Vol.9 No.1
Abstract_Roman A simulation method based on upper bound method is developed in order to characterize for- ging characters in forging of spur gears. In this paper, a kinematically admissible velocity field was newly proposed and applied to study the effec
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.
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.
조해용,김진용,김성민 선문대학교 ·중소기업기술지원연구소 2002 선문공대 연구/기술 논문집 Vol.7 No.1
인공토양을 생산하기 위해 점토와 톱밥에 첨가제를 사용하여 혼합한 재료는 화로에서 300~400℃로 약 20분 정도 처리하였다. 인공토양이 인공지반에서 토양의 조건으로 적당한가를 조사하기 위해서 인공토양의 물리·화학적 특성을 분석하였다. 인공토양의 입자크기는 직경 1.5~8㎜ 이었고, 점토토양과 펄라이트A와 비교해서 투수성, 총 질소 그리고 총 인이 높았다. 또한 인공지반의 녹화를 위한 경량토로서 펄라이트를 대신 인공토양을 이용하면 경제적인 효과가 기대된다. For the production of artificial soil, a mixture of clay saw dust as additives was formulated, and was thermally treated in the firing kiln at 300-400℃ for about 20minutes. The physico-chemical characteristics of the artificial soil were analyzed, in order to be used as a soil conditions to the artificial ground. The particle sizes of artificial soil were controlled to 1.5~8㎜ in diameter. Artificial soil showed high in permeablility, total nitrogen and total phosphorous concentration compared to the clay soil and perlite. In addition, artificial soil could be a cost-effective substitute for perlite as a light material for greening of artificial ground.
조해용,이종신,박인기 ( Hae Yong Cho,Jong Shin Lee,In Gi Park ) 충북대학교 산업과학기술연구소 1996 산업과학기술연구 논문집 Vol.10 No.1
Abstract_Roman This paper described integrated forging analysis program of gear-like components such as involute spur gear, trapezoidal spline, square spline, serration and circular gear by upper bound method. Each components has proper deformation regio
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.