Wisconsin 주의 Red Pine 생태계의 Biomass 와 Net Primary Production 에 관한 연구

이수욱,Bockheim, J. G. 한국임학회 1983 한국산림과학회지 Vol.59 No.1

Wisconsin州의 酸性水河堆土에 生成된 Plainfield loamy sand (Typic Udipsamment)에 生長하고 있는 34年生 Red Pine (Pinus resinosa) 間伐造林地內에 있어서 Biomass와 Net Primary Production (NPP)을 推定하였다. 間伐林과 非間伐林間의 推定値를 比較하고 差異를 유발시키는 要因으로 樹幹의 比重과 Form Factor에 의한 영향을 계산하였다. 1) 34年生 Red Pine 間伐林의 Biomass와 NPP는 각각 97.3Mg/ha와 11.5Mg/ha/yr이었다. 2) 推定方程式을 比較해 볼 때 間伐林과 非間伐林間에는 樹木各部分別로 Biomass의 差異가 있었다. 3) 以上의 差異는, ① 樹幹 (樹皮 제외)의 比重 (Basic Specific Gravity)의 差異와, 間伐로 인한 Form Factor의 差異로 인하여 發生한 것이다.

Red Pine(Pinus resinosa Ait.) 間伐地의 Biomass와 Net Primary Production(NPP)에 關한 硏究

李壽煜 충남대학교 농업과학연구소 1983 農業技術硏究報告 Vol.10 No.2

Dimension analysis was used to estimate biomass and net primary production(NPP) in a 35-year-old red pine (Pinus resinosa Ait.) plantation in central Wisconsin, U. S. A.. Total aove ground biomass was estimated at 97.3Mg ha^-1. Organic matter was distributed in the red pine stand as follows : bolewood 67.8%, live branches 15.4%, foliage 8.4%, bole bark 6.1%. Net primary production was estimated at 11.5Mg ha^-1 yr^-1 and was distributed : bolewood 30.4%, foliage 25.2%, branches 36.5%, bole bark 2.6%. There were differences in total biomass and proportion of biomass components when using the three equations. These differences are due to : a) difference in bolewood specific gravity and b) the effect of thinning on the form factor.

성과평가와 보상체계

이수욱 광운대학교 기업경영연구소 1997 기업경영연구 Vol.5 No.-

재무분석가의 예측수정에 대한 연구

이수욱 광운대학교 기업경영연구소 1996 기업경영연구 Vol.4 No.-

農科大學 扶餘 演習林의 植生調査

李壽煜,金智文,宋鎬京 충남대학교 농업과학연구소 1977 農業技術硏究報告 Vol.4 No.2

The experimental forest of Chungnam National University is located in Naryung-Ri, Eunsan-Myen, Buyeo-Gun, Chungcheongnamdo. The climax vegetations of Quercus species grown in central temperate zone are supposed to be destroyed before pure pine stands as a semi-climax vegetation are established on the southern aspect and along the ridges. Variability of vegetations is rather high and dominant species are such as Pinus densiflora, Quercus acutissima, Quercus variabilis, Quercus aliena, Quercus serrata, Lindera erythrocarpa, Platycarya strobilacea, and so on. There are 203 woody plants and 128 herbal plants. According to the use of vegetations they can be classified as follows; 60 familia and 154 species for edible source, 63 familia and 143 species for medicinal, 51 familia and 140 species for forage, 32 familia and 78 species for ornamental, and 12 familia and 27 species for timber source.

대기오염 및 산성우가 (酸性雨) 삼림생태계의 토양산도 (土壤酸度) 및 양료분포에 (養料分布) 미치는 영향

이수욱,민일식 ( Soo Wook Lee,Ill Sik Min ) 한국산림과학회 1989 한국산림과학회지 Vol.78 No.1

Four regions have been selected and surveyed to investigate the effects of air pollution and acid deposition on forest ecosystem. They were Seoul as urban region, Yeochon and Ulsan as industrialized region, and Kangwondo as uncontaminated region. Soil pH and the distribution of elements were analyzed in process of time for three years as well as by distance from pollution sources. In general, forest soils acidified in process of time from pollution sources to suburban areas. Hydrogen ion concentration in forest soils increased in 1988 as much as 60% of that in previous year. Average soil pH values in coniferous forest were 4.45 in Seoul, 4.54 in Yeochon, 4.81 in Ulsan, and 6.03 in Kangwondo. Forest soil pH increased with the distance from pollution sources to suburban areas at constant rate within short ranges (up to 30 ㎞) and at decreasing rate within long ranges (up to 200 ㎞). On the contrary, sulfur content in soils decreased every year except in Yeochon region. Base saturation of forest soils in polluted regions were all below 20% level compared with 70% in Kangwondo region. Active aluminum content in soils increased with the soil acidification at the highest rate in Yeochon, and the next in Ulsan and Seoul, Heavy metal content such as copper and zinc in tree tissues were the lowest in Kangwondo region, and the next in Yeochon, Seoul and Ulsan.

저사저수구의 (貯砂貯水溝) 유토저지효과에 (流土沮止效果) 관한 연구

이수욱,이태수 ( Soo Wook Lee,Tae Soo Lee ) 한국산림과학회 1976 한국산림과학회지 Vol.31 No.1

This study was carried out to find out the effect of soil and water storable pits on reducing the surface runoff. 10 pits were digged in each plot of 50 ㎡ along contour line. One kind of pits has a size of 30 ㎝ width, 100㎝ length and 30㎝ depth, and the other has 30㎝ width, 100㎝ length and 20㎝ depth. 1. The soil and water storable pits have a significant effect on reducing surface runoff. Control plot had surface runoff 2.3-2.6 times more than the plots with pits. 2. There is no significant difference in surface runoff between 30㎝ depth pit and 20㎝ depth pit. 3. The soil and water storable pits did not have any effect on coverage, survival and growth of three species. 4. Steep slope had worse results than the other slopes in coverage, growth and fresh weight of experiment species.

차세대 인터넷 도입을 위한 경계 라우터의 성능분석에 관한 연구

이수욱,황성호,임해진 三陟大學校 2004 論文集 Vol.37 No.-

The IPv6(Internet Protocol version 6), a next generation internet protocol. was standardized to solve the problems of the IPv4(Intemet Protocol version 4). However. the IPv4 could not be actually converted to the IPv6 at one time. Therefore. the transition mechanism is thought to be very much important to be compatible with the IPv4 naturally and convert to the IPv6 network gradually. Despite of the development of various kinds of the transition mechanism, the IPv6 network was not expanded. The research was mainly made not for current system environment but for technical purposes. This paper investigated the performances through the transition mechanism and examined proper ways being applicable to current environment.

Deep Structured Learning: Architectures and Applications

이수욱 국제문화기술진흥원 2018 International Journal of Advanced Culture Technolo Vol.6 No.4

Deep learning, a sub-field of machine learning changing the prospects of artificial intelligence (AI) because of its recent advancements and application in various field. Deep learning deals with algorithms inspired by the structure and function of the brain called artificial neural networks. This works reviews basic architecture and recent advancement of deep structured learning. It also describes contemporary applications of deep structured learning and its advantages over the treditional learning in artificial interlligence. This study is useful for the general readers and students who are in the early stage of deep learning studies.

황폐지 토양수분이 묘목의 (苗木) 생장 및 양분흡수에 미치는 영향

이수욱,김지문,송호경 ( Soo Wook Lee,Chi Moon Kim,Ho Kyeong Song ) 한국산림과학회 1978 한국산림과학회지 Vol.38 No.1

In afforestation of denuded forest land soil conditions playa very important role in early growth of cover vegetations. This study was designed for understanding the effect of soil moisture regime on growth and nutrient uptake of some seedlings. Cover vegetations such as Pinus rigida Miller, Robinia pseudoacacia L. and Lespedeza bicolor Turcz. were planted in pot with the soil transported from denuded forest land in Musu-ri Sannae-Myeon. Daedeog-Kun, Chungnam Province. There were 3 moisture treatments and 4 fertility levels in P₂O_5 with 4 replications. Influence on growth was observed by the variation in dry weight and nutrient uptake was studied in nitrogen, phosphate and kalium. Results are as follows: 1. For Pinus rigida seedlings decrease in soil moisture tension increases growth of dry weight and enhance the uptake of kalium. Increase in P₂O_5 fertility level tends to decrease the uptake of kalium rather than increase in P₂2O_5 uptake. 2. In Robinia pseudoacacia increase in soil moisture content stimulates the uptake of nitrogen and kalium. Increase in P₂O_5 level enhances the uptake of P₂O_5 and increases growth of dry weight. 3. In Lespedeza bicolor increase in soil moisture content has a tendency of decrease in nitrogen uptake. Increase in P₂O_5 level increases the growth of dry weight as well as the uptake of P₂O_5.