옻나무 재배농가의 경영실태에 관한 연구

송병민,한재국 ( Byong Min Song,Jae Kuk Han ) 한국산림경제학회 1996 산림경제연구 Vol.4 No.1

I . B . R . D . 새마을사업차관에 의한 연료림조성의 (燃料林造成) 경제분석에 관한 연구

송병민,박태식 ( Byong Min Song,Tai Sik Park ) 한국산림과학회 1983 한국산림과학회지 Vol.59 No.1

The study was performed to decide the returns or investment efficiency of the fuel forest established project and to examine its economic value as compared the benefit with the cost occurring from that established by I.B.R.D loan. The data got from the surveying plot and other things connected with the project were applied to the measures of benefit-cost ratio and internal rate of return (IRR). The following are the results from the economic analysis of the fuel forest created by the loan per hectare 1) In case of converting the fuelwood value from the fuel forest into briquet price, the benefit-cost ratio is 1.18 at the 6 percent discount rate and the IRR is appraised to 12.2 percent 2) In the sensitivity analysis estimated by the rising rate of rural wages 27% the yearly mean, the B/C ratio is 1.07 at the 6 percent discount rate and the IRR 9.2 percent. 3) In the sensitivity analysis estimated by the rising rate of briquet price, 26% the yearly mean, the B/C ratio is 1.34 at the 6 percent discount rate and the IRR is appraised high to 15.7 percent 4) In the event of including indirect effects to the direct in the project, the economic effect could be increased just a little more.

옻나무 우죽의 수피생산량 분석

송병민(Byong-Min Song),이명선(Myoung-Sun Lee) 한국자원식물학회 2005 한국자원식물학회지 Vol.18 No.2

This study was conducted to investigate the bark production from a top branch(Woojuk) of lacquer tree(Rhus verniciflua) that collected Rhus lacquer in summer, analyzing a relationship between several factors - diameter, tree weight, weight of Woojuk and bark. The weight of Woojuk averaged was made up 48% of the tree on average. As the weight of the tree increased, however, the Woojuk showed the rising trend. It was turned out that the tree size for making 1kg of dry bark must be at least DBB 8cm. The result on Woojuk s bark was that 43.3% of total trees produced a green bark of 1.1kg to 1.5kg, and most of them put out 1.5kg and less. Also the rate of trees to make 0.6kg to 1.0kg of dry bark was highest in 50.8%, but its production in most trees was 1.0kg and below. As the moisture content of a green bark averaged 39%, it is estimated that the production of 1kg in dry bark requires at least 6kg of top branch in lacquer tree.

옻나무의 주요 인자에 따른 옻채취량의 상관분석에 관한 연구

송병민(Byong Min Song),이철(Cheol Lee) 한국산림경제학회 2001 산림경제연구 Vol.9 No.2

N/A

옻나무의 암수에 따른 주요인자와 옻채취량의 상관분석

송병민(Byong-Min Song),이철(Cheol Lee) 한국자원식물학회 2005 한국자원식물학회지 Vol.18 No.2

본 연구는 옻나무의 암수구분에 의한 직경, 수고 및 수관폭에 따라 옻채취량의 변화관계를 조사하여 옻나무의 암수별 각인자의 옻채취량에 대한 상관관계와 회귀분석을 실시한 결과 암수구분에 의한 직경과 옻채취량의 관계에서는 암수 모두 직경증가에 따라 옻채취량도 증가하는 경향을 보였으며, 일반적으로 수나무개체들이 암나무 보다 옻채취량에 있어서 높은 수치를 나타내는 경우가 많았다. 암수구분에 의한 수관폭의 변화가 옻채취량에 미치는 영향력은 작게 나타났으나, 수관폭이 증가할수록 옻채취량도 증가하는 추세를 보여주었다. 또한 암수구분에 의한 회귀분석은 수나무보다 암나무의 주요인자들이 옻채취량에 더 많은 영향을 미치는 것으로 나타났으며, 직경, 수고, 수관폭 및 옻채취량의 유의적 차이는 없는 것으로 분석되었다. The study was conducted to investigate the correlation and regression analysis between the factors - diameter, hight and crown width - and collection amount of Rhus lacquer by the sex of Rhus verniciflua. The relationship between the diameter and the collection amount of the lacquer by the sex of the lacquer tree indicated that, for both of the male and the female, the lacquer amount was likely to increase as the diameter got larger. In general, the male trees tended towards the higher amount of the lacquer than the female. The relationship between the crown width and the collection amount of the lacquer by the sex showed little difference. As the crown became wider, however, the lacquer amount showed the increasing trend. The regression analysis by the sex of the tree indicated that the major factors of the female had larger influence on the lacquer amount than those of the male. The no differences of statistical significance were found among the diameter, the height, the crown width, and the lacquer amount.

옻나무의 생산방식에 따른 투자효과분석

송병민 ( Byong Min Song ) 한국산림경제학회 1997 산림경제연구 Vol.5 No.1

스프링클러시스템을 이용한 잣나무 채종원의 구과해충 방제에 관한 연구

정상배(Sang-Bae Chung),송병민(Byong-Min Song),권건형(Gun-Hyung Kwon) 한국자원식물학회 2006 한국자원식물학회지 Vol.19 No.1

In order to prevent cones from being damaged by cone insects, Gravitarmata margarotana and Dioryctria abietella, sprinkler system was installed on the Pinus koraiensis Seed Orchard. Such a test was conducted at Chung-ju, Chungcheong buk-do, Korea in 2002. Insectides of Diflubenzuron 25% WP ×2500 and Cyfluthrin 2%EC ×1000 were sprayed at fifteen-day and twenty-day intervals during the period of insects adult occurrence by sprinkler system. The Gravitarmata margarotana generally emerged for about 53 days from middle April to early June, and peak emergence was 10 days from April 20 to April 30. Dioryctria abietella generally emerged for about 108 days from late April to early August, and peak emergence was 10 days from May 20 to May 30. Damage rate of cones were 8.7~9.7% and 10.9~12.7% on average with crown insecticide spraying with Cyfluthrin and Diflubenzuron, while 67.5% when not treated. Control effectiveness of this insecticide spraying was 85.6~87.1% and 83.9%와 81.2%, respectively. When it considers the forest environment, it is recommended diflubenzuron which is low toxic pesticide. In conclusion, effectual times and number of diflubenzuron 25% WP application with sprinkler system against cone insects were from early May through late August and six times at twenty-day interval.

포플러加工業體의 經營實態및 財務分析에 關한 硏究

宋炳珉 尙志大學校 1989 論文集 Vol.10 No.-

The study was conducted 1) to investigate the status of poplar utilization and 2) to analyze the managerial and financial status of poplar processing enterprises in Korea. The major results obtained from the study were summarized as follows : 1. The annual uses of poplar wood did not increase markedly in the 1980's as compared with those in the 1970's. However, in recent years utilization of chopstick rather increased, whereas that of matchsplint decreased. 2. About 80% of poplar processing enterprises consisted of the employees less than 50 persons, and the employees were, for the most part, females. 3. About 80% of the enterprises has used Italian poplar as raw material, and 58.2% of them decided product price on the basis of competitive price. 4. The financial stability of the enterprises was, in general, better than those of medium manufacturing and wood inustries. However, the net profit and turnover ratio to net worth were under the standard level. 5. For the proportion of production cost to net sales, the ratio of fixed cost was higher than that of variable one. Break-even point ratios for the enterprises investigated were better than those for medium manufacturing and wood industries. But the ratio of profitability became low as employee size increased.

이태리포플러 造林事業의 投資分析

宋炳珉 尙志大學校 1990 論文集 Vol.11 No.-

The reserch was conducted to evaluate the profitability of the plantation investment of Italian poplar. The major results obtained were summarized as follows : 1. The plantation areas of Italian poplar in Korea amounted to be over 680,000ha, of which about 50% was planted at the end of the 1970's and in the early of the 1980's. 2. From the analysis of investment efficiency for the plantation by site indices, benefit-cost ratios showed 1.8 to 4.1 at 5.5% in discount rate, 1.2 to 2.7 at 10%, and 0.95 to 2.2 at 12%. The net present worth per ha at 5.5% in discount rate was estimated 968,011 to 3,846,679 won. The internal rate of return was assessed with 11.5 to 21.0%. Thus, the investment for planting Italian poplar appeared profitable. 3. In the sensitivity analysis by site indices, 12.5 to 22.0% for the profit rate was shown when returns increased by 10%. The lowest rate was 9.5 to 18.7% when cost increased by 10% simultaneously as well as returns decreased by 10%.

옻나무 造林과 옻液의 生産 및 利用 實態에 關한 硏究

宋炳珉 尙志大學校 1995 論文集 Vol.16 No.-

For being helpful to activate the growing of Rhus vernicifera and increase the utilization of rhus lacquer, the planting accomplishment of that in Korea and the growing results in Wonju area were considered, and the production and use of the lacquers were researched also to search about for several problems on those. The growing of the lacquer tree in this country has a long history that it has been planted from Silla era. During japanese period, they took much interest in a rhus lacquer from korea, bagan the researches about it, and promoted and made a lacquer tree planted in rural areas. Nowaday, most of the rhus lacquer in this country have been produced in Wonju area, Kangwon province. There was the planting accomplishment of 125,000 stocks yearly from 1992 to 1994. As of 1994, number of households growing a lacquer tree in this area showed to be formed 288, of which 262 (91%) owning 1ha and less. The quantity of a lacquer used in the country was equivalent to 3,000kg yearly, of which over 1,000kg has been produced in Wonju area. Above 70% of total production had been exported to Japan, but as the rhus lacquers low-priced from China began to be exported, the export of Korea lacquers took a sudden urn for the worse. The crude lacquers collecting from this county have been recognized to be superior to the other countries. But a large number of furniture manufacturers has used the refined lacquers imported from Japan. Therefore, the methods of refining crude lacquers must be improved as soon as possible. As the collecting work of that requires a specific physical constitution, one will acquire no longer the collection process of rhus lacquers. Now the workers engaging in rhus lacquer collection amout to no more than 30 in Wonju area, but, according to their reduction, the measures to meet the situation must be taken in future. Finally, the various uses of rhus lacquers and production of the excellent refined must be accomplished so that the growing size of lacquer tree and the income earning from that may be increased.