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RISS 인기검색어
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- 저자 : 신만용 (검색결과 198 건)
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신만용 國民大學校 山林科學硏究所 2000 山林科學 Vol.12 No.-
The objective of this study was to provide basic information for the rational management and efficient usage of the experimental forest based on the analysis of stand attributes and stand structure. For this, data of 10 compartments were collected by plot sampling techniques. The data were then analyzed by using a computer program which is SIDAS(stand inventory data analysis system) to investigate various stand statistics and stand structures such as diameter, height, and volume distribution by compartment. Each compartment of the study area has relatively high growing stock compared with stand age, but shows stand structures having small diameter classes. As a result, most of the compartments are required to reduce the stand density by using appropriate tending practice such as thinning. Based on the analysis of stand attributes and structures for each compartment, two goal stand types are proposed. They are pure stand of red pin and mixed stands of red pine and oak. In the next management planning period, thinning is mainly needed in order to control the stand density and finally induce to the specific goal stand type.
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樹高曲線式의 精度 提高를 위한 Kalman Filter 推定量의 利用
申萬鏞 國民大學校 山林科學硏究所 1995 山林科學 Vol.7 No.-
The Kalman filter estimation technique was employed to update height estimation equations. Two different sources of prior information were used to modify the estimates of height-diameter regression model from the sample data using the Kalman filter. The Kalman filter and two OLS estimators were evaluated based on the estimation ability of the resulting height eqations. The Kalman filter estimator performed better than the two OLS estimators for both validation data sets. Data collected inside of the study area formed better prior information than those from outside of the sample rage. This indicated that the quality of prior information was important in using feedback procedures such as Kalman filter approach.
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申萬鏞 國民大學校 山林科學硏究所 2001 山林科學 Vol.13 No.-
본 연구는 임분의 형태에 따라 구분된 낙엽송 임분과 천연 활엽수림을 대상으로 임목간의 경쟁관계를 합리적으로 구명할 수 있는 다양한 경쟁지수 중에서 각 임분 유형에 적합한 최적 경쟁지수를 선발하기 위해 수행되었다. 이를 위해 2개의 거리종속 경쟁지수 모형과 6개 경쟁목 선정방법의 조합에 의하여 만들어진 12개 경쟁지수와 1개의 거리독립 경쟁지수, 즉 총 13개의 경쟁지수와 흉고직경의 정기평균생장량과의 상관분석을 통해 임분 유형별로 적합한 경쟁지수를 선발하였다. 정기평균 생장량과 13개 경쟁지수의 상관을 분석한 결과, Martin-Ek 경쟁지수 모형의 경쟁목 선정은 중심목의 수관 최하단에 50°로 시준하여 주변 경쟁목의 수고를 고려하는 경쟁지수 ME-H2가 낙엽송 임분의 경쟁관계를 가장 적합하게 설명하는 것으로 판명되었다. 반면에 천연 활엽수림의 경우에는 Schro¨der-Gadow에 의해 제안된 거리독립 경쟁지수인 S-G 모형이 12개의 거리종속 경쟁지수보다 생장 추정 능력이 우수하여 가장 적합한 것으로 판명되었다. 본 연구로부터 얻어진 결과는 각 임분 형태에 따른 생장 예측과 사업체계의 정립에 필요한 기초자료를 제공할 수 있을 것으로 기대된다. This study was conducted to the best competition index for the investigation of competition status among individual trees grown in Japanese Larch stand and natural deciduous stand, respectively. For this, twelve distance-dependent competition indices and one distance-independent competition index were compared to select the best competition index by the correlation analysis with periodic annual increments of diameter measured in each stand. Based on the correlation analysis, it was revealed that the competition index of ME-H2 was better in terms of the performance than others in Japanese Larch stand. On the other hand, in natural deciduous stand, S-G model of distance-independent competition index was better than any other distance-dependent competition indices in the performance. The results obtained in this study are expected to provide a basic information about growth patterns important to future stand prediction and silvicultural systems which can be applied to each of different stand types.
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