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이동한계유속과 한계소류력을 활용한 수제 설치에 관한 연구
김영식(Yeong Sik Kim),박상호(Shang Ho Park),안익태(Ik Tae An),추연문(Yeon Moon Choo) 한국습지학회 2020 한국습지학회지 Vol.22 No.3
현재 전 세계적으로 과거와는 달리 기후양상으로 인한 물 부족문제와 함께 홍수로 인한 재해의 위험을 동시에 관리해야하는 어려움에 직면한 상황이다. 수자원의 관리와 물 산업 육성을 통한 물 강국 실현을 목적으로 4대강 사업이 시행되었으며 유례없는 공사 규모에 비하여 상대적으로 단기간의 공사기간을 두고 진행되었다. 이에 4대강 사업 이후 하천환경이 어떻게 달라지는가에 대한 예측 및 분석이 미흡한 상태이다. 현재 4대강 사업 공사구간 일부에서는 대규모 준설과 홍수 시보로 인한 사류화의 영향으로 인해 침식 및 퇴적이 반복되어 발생하며 지류부의 두부침식이 발생한다. 이러한 문제점 해결을 위해 하상유지공이 설치되었으나 오히려 하천 양안을 침식시키는 결과를 초래하였으며 침식과 과도한 퇴적 등 하상을 안정하게 유지시킬 수 있는 새로운 접근방법 및 기법의 개발이 요구된다. 수제는 하천에서 흐름을 하도 중앙으로 집중시켜 주운을 위한 일정수심을 확보하는 역할을 하며 흐름방향과 유속을 제어함으로써 흐름에 의한 제방 침식작용을 방지하는 호안 역할을 한다. 또한, 수제는 하안 및 제방의 보호 기능 외에 국부적인 침식과 퇴적을 유도함으로써 자연스러운형태의 하안을 형성하여 다양한 생태환경을 제공한다. 따라서 본 연구에서는 이동한계유속과 한계소류력을 활용하여 현재사용되고 있는 수제형상결정 방법을 검토한 후 실제 국내하천에 적용 가능한 수리학적 인자를 고려한 새로운 한계유속( ) 및 새로운 저항계수 식을 개발하여 수제 설치 시 적용 가능한 방안을 제시하였다. Unlike in the past, the world is facing water shortages due to climate change and difficulties in simultaneously managing the risks of flooding. The Four Major Rivers project was carried out with the aim of realizing a powerful nation of water by managing water resources and fostering the water industry, and the construction period was relatively short compared to the unprecedented scale. Therefore, the prediction and analysis of how the river environment changes after the Four Major Rivers Project is insufficient. Currently, part of the construction section of the Four Major Rivers Project is caused by repeated erosion and sedimentation due to the effects of sandification caused by large dredging and flood-time reservoirs, and the head erosion of the tributaries occurs. In order to solve these problems, the riverbed maintenance work was installed, but it resulted in erosion of both sides of the river and the development of new approaches and techniques to keep the river bed stable, such as erosion and excessive sedimentation, is required. The water agent plays a role of securing a certain depth of water for the main stream by concentrating the flow so much in the center and preventing levee erosion by controlling the flow direction and flow velocity. In addition, Groyne products provide various ecological environments by forming a natural form of riverbeds by inducing local erosion and deposition in addition to the protection functions of the river bank and embankment. Therefore, after reviewing the method of determining the shape of the Groyne structure currently in use by utilizing the mobile limit flow rate and marginal reflux force, a new Critical Movement Velocity( ) and a new resistance coefficient formula considering the mathematical factors applicable to the actual domestic stream were developed and the measures applicable to Groyne installation were proposed.
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都市 建築物 外粧 色彩에 관한 硏究 : 부천역을 中心으로 around Bucheon Station, in Bucheon
박상호 부천대학 1996 論文集 Vol.17 No.-
The purpose of this researches is to present the color data by investigating and head justing the exterior color actual condition of building(around Bucheon Station, in Bucheon), and is to contribute to the improving and realizing the building color in the future, by investigating and examining. The scope of this investigation was compare 165 colored buildings 10 years ago with present 185 colored buildings around Bucheon Station, in Bucheon, and the actual conditions of 185 colored buildings was investigated and examined. AS the method of this study, a field investigation method were practiced. And the colors were classified into 20 Munsell color system. By visual contract sampling method using standard color (JIS standard colors) and KSA-0011 color names are used as symbols and the terminology based on KSA-0064 are used. The conclusion is as follow : The exterior colors of buildings were mostly Y(5Y), yR(10R), ry(10YR) series, value was average 7.1 and chroma was average 3.4. The color feeling of present buildings in Bucheon was cheerful and optimistic.
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A Study on Optimization Techniques for Cellular Radio Channel Assignment
박상호 安東大學校 工業技術硏究所 1997 공업기술연구논문집 Vol.4 No.1
The channel assignment problem in mobile telephone communication has become increasingly important since the usable range of the frequency spectrum is limited. Neural networks and genetic algorithms are two optimization methods which have been extensively researched recently. These algorithms have the distributed processing capabilities with their parallel characteristics. With these capabilities and characteristics, sequential tasks can be solved in parallel format. One advantage of neural networks over genetic algorithms is efficient local search capability. On the other hand, the main advantage of genetic algorithms over neural networks is a powerful capability in global search. In this paper, these two optimization algorithms are compared in the channel assignment problem. To avoid falling into the local minima in the neural networks approach, certain techniques such as the forced assignment and the changing cell list order are used. In the genetic algorithms approach, the proper genetic operators are developed. All three constraints such as the co-channel constraint, the adjacent channel constraint and the co-site channel constraint are considered for the channel assignment problems. As simulation results, the convergence rates according to the various techniques for the two approaches are presented and compared.
ScienceON
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