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유동식 가선집재시스템 Live Skyline 의 역학분석에 관한 연구
정주상(Joo Sang Chung),정우담(Woo Dam Chung) 한국산림과학회 1994 한국산림과학회지 Vol.83 No.3
In this paper, the characteristics of cable logging systems, of which skyline length is adjustable during operation are discussed from a standpoint of system geometry. Among the cable logging systems, the live skyline is the typical one, of which operation is easy to understand. To analyze the cable logging mechanics of the live skyline, computer models were developed. In developing the computer models, the concept of the live skyline operation was classified into `true live skyline` and `live skyline with lift`. The former assumes to adjust skyline length continuously to maintain the skyline clearance over ground constant during inhaul ; the latter assumes to shorten the skyline length only to keep the minimum skyline clearance during inhaul. The computer model was used in investigating the mechanical efficiency and the operational characteristics of the live skyline system. First, the payload capability of live skyline was compared with that of standing skyline. Second, the effect of the change in the log-drag geometry on the payload capability of live skyline was investigated. Finally, the payload capability of live skyline with lift was compared with that of true live skyline as an effort to explain the concepts of true live skyline and live skyline with lift.
급경사지 산림작업을 위한 차량의 역학분석에 관한 연구 - 차륜형 집재작업 트랙터를 중심으로 -
정주상(Joo Sang Chung),정우담(Woo Dam Chung) 한국산림과학회 1995 한국산림과학회지 Vol.84 No.2
In this paper, a mechanical analysis model for steep - slope log - skidding operations of a rubber - tired tractor is discussed and the applicability of the model is investigated. The model largely consists of mathematical analysis models for log drag, dynamic vehicle weight distributions and soil - vehicle traction. For the case study, a theoretical data set for log skidding operations is used in investigating the effect of the factors influencing the results of mechanical analysis or the productivity of skidding operations. The analyses include 1) the effect of log choking methods on tangential log - skidding force, 2) the effects of the change in travel speed and log load on the required input power to the wheels and 3) the log skidding performance of a two - wheel drive compared with that of a four - wheel drive.
정주상(Joo Sang Chung),정우담(Woo Dam Chung) 한국산림과학회 1995 한국산림과학회지 Vol.84 No.3
A user - oriented computer model to aid designing forest road is developed to release the burden by increasing efficiency of time - consuming and laborious road design works. In this paper, the structures and functions of the model are discussed. The model consists of functional modules 1)input module to treat survey data and design criteria : 2)road design module to generate preliminary road layout, horizontal and vertical curvatures and curve widening : 3)earthwork analysis module to determine the economic mass movement : 4)report writer module to produce hard copies of engineering drawings for plan views, cross - sections and profiles, earthwork calculation sheets and mass movement diagrams. In addition, the report writer also provides the information on earthwork disturbance along the cut and - fill slopes. The modules are designed to be fully - integrated to enable the users to perform engineering analyses and evaluate design alternatives in a series of road design procedures.
산림수확 시뮬레이터 HARVEST 응용에 의한 벌채지 공간배치 사례연구
송정은 ( Jung Wun Song ),장광민 ( Kwang Min Jang ),한희 ( Hee Han ),설아라 ( A Ra Seol ),정우담 ( Woo Dam Chung ),정주상 ( Joo Sang Chung ) 한국산림과학회 2012 한국산림과학회지 Vol.101 No.1
In this study, we used HARVEST, a timber management strategy assessment tool, to evaluate alternative forest planning strategies on spatial pattern of cutting blocks. We applied the tool to the Gwangreung Experimental Forest (GEF) as a case study. The harvest schedules developed for GEF using a linear programming model was used to assess spatial patterns of cutting blocks under different management constraints. The results show that the allowable maximum harvest size largely affects the number, size, and distribution of cutting blocks. We also found that spatial dispersion methods and adjacency constraints could be used as an effective means to control spatial allocation of cutting blocks in order to meet certain forest ecosystem management goals.