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정주상,박은식,오동하 ( Joo Sang Chung,Eun Sik Park,Dong Ha Oh ) 한국산림과학회 1998 한국산림과학회지 Vol.87 No.2
It is not an easy task for forest managers to make sound decisions on forest management and operations planning because of huge sets of spatial and temporal data and complex decision-making processes involved. However, as an efficient tool, GIS techniques enable them to enhance broad understandings on forest inventory and management conditions. In this study, we developed a GIS model for field use in forest management. In building the model, we have chosen MapInfo version 4.0 as the basic engine of the model. The model also includes an interface module to help forest managers use MapInfo functions easily. It handles MapInfo functions required to manage inventory data and analyze spatial distributions of forest stands. For testing field applicability of the model, we have build field data sets for a district of Chunchun National Forest. Then, we tested functions through quarrying stand attributes and constructing thematic maps. In this paper, the structures and functions of the model as well as the results of field applications are discussed.
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.
임분의 적정 시업체계분석을 위한 Neural Network 기법의 적용성 검토
정주상(Joo Sang Chung),Joseph P . Roise(Joseph P . Roise) 한국산림과학회 1995 한국산림과학회지 Vol.84 No.1
This paper discusses applications of neural network to stand stocking control problems. The scope of this research was to develop a neural network model for finding optimal stand management regimes and examining the performance of the model for field application. Performance was analyzed in consideration of the number of training examples and structural aspects of neural network. Research on network performance was based on extensive optimization studies for pure longleaf pine(Pinus palustris) stands. For experimental purposes. an existing nonlinear even-aged stand optimization model with a whole-stand growth and yield simulator was used to generate data samples required for the performance analysis.
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.
협업체 (協業體) 운영에 대한 참여산주들의 (參與山主) 인식과 정책적 추진실태에 관한 분석
정주상(Joo Sang Chung),박은식(Eun Sik Park),김규헌(Kyu Hun Kim) 한국산림과학회 1996 한국산림과학회지 Vol.85 No.3
The objective of this study was to investigate the actual state of the national project to promote the management of Forest Management Cooperatives(FMC). To fulfil the objective, we have reviewed recent statistics, regulations, and publications related with FMC and interviewed officials and professionals engaged in FMC-related organizations. Also cognition of members on the actual state of the management of FMC`s was studied by a questionnaire survey. The questionnaire was designed to get understandings of the general cognition of FMC`s members associated with forest management and FMC`s management activities. According to the results of the survey, more than 50% of members are not interested in forest management and most of them are not satisfied with the activity of FMC. In this paper, the results of analyses for the survey are discussed in detail. On the other hand, statistics indicate that the basic policy for FMC contributes to rapid growth in the number of local FMC`s. However, the increase of FMC`s has negative effect on management conditions of existing FMC`s because of reduced budget allocation from the government, In addition, we concluded that some parts of current regulations for FMC are unfavorable in promoting the spontaneous management activities of local FMC`s.