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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.
파티클보드 제조공정의 (製造工程) 최적화 모델개발에 관한 연구
정주상(Joo Sang Chung),박희준(Hee Jun Park),이필우(Phil Woo Lee) 한국산림과학회 1993 한국산림과학회지 Vol.82 No.4
In this paper, a nonlinear programming model to determine the optimal operating policy to minimize production costs for particleboard plants is presented. The model provides optimal values for three decision variables : specific gravity of particleboard, mat moisture content and mat resin content. These decision variables are key factors influencing the cost and quality of particleboard manufacturing processes. In formulating the nonlinear programming model, the minimum quality standards for internal bond strength and modulus of rupture of particleboard are used as industry-wide quality constraints. These quality standards are expressed as nonlinear functions of the decision variables. In order to demonstrate the applicability of the proposed model, the model is applied to solve for optimal solutions of four theoretical problems. The problem scenarios are built to investigate effects of changes in hot-pressing speed and purchase price of chip and resin.
대단지 산림의 목재생산계획 분석을 위한 선형계획 (線型計劃) 실험전산모델에 관한 연구
정주상(Joo Sang Chung),박은식(Eun Sik Park) 한국산림과학회 1993 한국산림과학회지 Vol.82 No.3
This research developed a forest-level harvest scheduling model using linear programming (LP). The formulations of the LP model include timber production schemes with constraints of nondecling yield forest conversion strategies, the minimum timber supply, levels and the maximum cut acrages. The model is able to generate both Model I and Model II types of input matrix in MPS format. In this paper, use of LP in building the framework of the strategic forest planning model ?as justified by comparing the algorithmic characteristics of LP with those of Gentan probability and binary search approaches through literature reviews. In order to demonstrate the field applicability of the model proposed. (1 the harvest scheduling problem for about 11,000-hectare case study area Wt. Baekun area in Southern Experimental Forest of Seoul National University) was formulated and soloed and 2 the effects of the change in task regulatory timber production constraints or. optimal harvesting schedules here investigated.
가선집재시스템 역학구조 해석에 관한 연구 - 고정식 가선집재시스템을 중심으로 -
정주상 ( Joo Sang Chung ) 한국산림과학회 1993 한국산림과학회지 Vol.82 No.1
In this paper, the characteristics of cable logging operations are discussed from a standpoint of mechanics. An example of standing skyline operations is used to illustrate the mechanical principles. Using force and moment boundary conditions, the maximum allowable payload was formulated as a function of slope profile, system geometry and operation options. This formulation includes fundamental equations for log drag and single segment mechanics. The catenary link model is the basic assumption in simulating cable segment stretches. In order to demonstrate the solution procedures of the formulation, a computer model was developed. The model uses Secant algorithm to determine the solution of the complex nonlinear equation set. Finally, the computer model was demonstrated using a hypothetical data set.
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.
공간분석모델링에 의한 산지의 토사붕괴방재기능 적합도 평가
정주상(Joo Sang Chung),김형호(Hyung Ho Kim),차재민(Jae Min Cha) 한국산림과학회 2001 한국산림과학회지 Vol.90 No.4
The objective of this study is to develop a spatial analysis modeling technique to evaluate the functional suitability of forest lands for land slide prevention. The functional suitability is classified into 3 categories of high, medium and low according to the potential of land slide on forest lands. The potential of land slide hazards is estimated using the measurements of 7 major site factors : slope, bed rock, soil depth, shape of slope, forest type and D.B.H. class of trees. The analytic hierarchical process is applied to determining the relative weight of site factors in estimating the potential of land slides. The spatial analysis modeling starts building base layers for the 7 major site factors by 25m × 25m grid analysis or TIN analysis, reclassifies them and produces new layers containing standardized attribute values, needed in estimating land slide potential. To these attributes, applied is the weight for the corresponding site factor to build the suitability classification map by map algebra analysis. Then, finally, cell-grouping operations convert the suitability classification map to the land unit function map. The whole procedures of the spatial analysis modeling are presented in this paper.