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임목재적 (林木材積) 산정을 위한 Simple Random Sampling 과 Two - stage P . P . S . Sampling 방법의 비교
김재수,Ned Horning ( Je Su Kim,Ned Horning ) 한국산림과학회 1984 한국산림과학회지 Vol.65 No.1
The purpose of this paper was to figure out the efficiencies of two sampling techniques, a simple random sampling and a two-stage P.P.S. (probability proportional to size) sampling, in estimating the volume of the mature coniferous stands near Salzburg, Austria. With black-and-white infrared photographs at a scale 1:10,000, the following four classes were considered; non-forest, young stands less than 40 years, mature beech and mature coniferous stands. After the classification, a field survey was carried out using a relascope with a BAF (basal area factor) 4. For the simple random sampling, 99 points were sampled, while for the P.P.S. sampling, 75 points were sampled in the mature coniferous stands. The following results were obtained. 1) The mean standing coniferous volume estimate was 422.0㎥/㏊ for the simple random sampling and 433.5㎥/㏊ for the P.P.S. sampling method. However, the difference was not statistically significant. 2) The required number of sampling points for a 5% sampling error were 170 for the two stage P.P.S. sampling, but 237 for the simple random sampling. 3) The two stage P.P.S. method reduced field survey time by 17% as compared to the simple random sampling.
김재수(Je Su Kim) 한국산림과학회 1999 한국산림과학회지 Vol.88 No.1
Evapotranspiration is one of important variables affecting ecosystem processes such as vegetation distribution and growth. It acts as a limiting factor for natural water resource management. The transpiration of vegetation is mainly determined by climatic factors. The lower slope of the study area was densely forested with Pinus densiflora S. et Z. of 8 m height, and the upper slope was covered with poorly grown Pinus densiflora S. et Z. and Quercus trees. The amount of evapotranspiration was estimated to 590.3 ㎜/yr by annual water budget method. The canopy resistance of Penman-Monteith model was determined as 99 s/m. Seasonal evapotranspiration can be estimated with the calculated evaporation and the canopy resistance. The amount of evapotranspiration peaked in May. That is considered from both the direct evaporation of intercepted rainfall and the transpiration of vegetation during the dry spring season.
김선종 ( Kim Sun Jong ),김진수 ( Kim Jin Soo ),오광영 ( Oh Kwang Young ),김재수 ( Kim Je Su ),류득현 ( Yoo Deuk Hyeon ) 한국농공학회 2001 한국농공학회 학술대회초록집 Vol.2001 No.-
This study was carried out to investigate water quality of streamflow from a forest land in non-rainy day. We measured discharges and the concentration of streamflow for T-N, T-P and COD at ten day intervals. The average concentrations of pollutants in streamflow were lower than those in rainfall, exhibiting that forest land has water purification functions. The concentrations of T-N and COD increased with increasing discharge, while T-P concentrations were almost constant.
김선종 ( Kim Sun Jong ),김진수 ( Kim Jin Soo ),오광영 ( Oh Kwang Young ),김재수 ( Kim Je Su ),류득현 ( Yoo Deuk Hyeon ) 한국농공학회 2000 한국농공학회 학술대회초록집 Vol.2000 No.-
This study was carried out to investigate water quality of streamflow in a forest land. We measured discharges and the concentration of streamflow for T-N, T-P, COD, cations(Na<sup>+</sup>, K<sup>+</sup>, Ca<sup>2+</sup>, Mg<sup>2+</sup>), and anions(CI<sup>-</sup>, SO<sub>4</sub><sup>2-</sup>). The average concentration of pollutants were extremely low, such as 0.4mg/ℓ for T-N, 0.02 mg/ℓ for T-P and 2.68mg/ℓ for COD. The concentration of cations have a tendency to decrease with increasing discharge, while the concentration of SO<sub>4</sub><sup>2-</sup>) increase with increasing discharge. It was found that the average concentration of Ca<sup>2+</sup> was highest and that of K<sup>+</sup> was lowest among cations.
산림소유역의 장 단기 유출 해석을 위한 강우 - 유출모형의 개발
우보명,김재수,이헌호,최형태 ( Bo Myeong Woo,Je Su Kim,Heon Ho Lee,Hyung Tae Choi ) 한국산림과학회 1998 한국산림과학회지 Vol.87 No.1
The purpose of this study was to develop the Rainfall-Runoff Model for a long and short term runoff analysis in small forested mountain watersheds. This model was derived from tank model. This model is composed of four tank. Tank I, Tank II, TankIII, and TankIV represent interception loss in forest canopy, direct runoff, base flow, and surface flow component, respectively. This model was tested with two experimental watersheds, located in southern part of Korea. As the result, this model had potentials for simulating and analyzing the long and short term runoff in small forested watersheds.
염인환(In-Hwan Yeom),최윤호(Yeon-Ho Choi),김명준(Myeong-Jun Kim),권형근(Hyeong-Keun Kweon),이준우(Joon-woo Lee),김재수(Je-su Kim),박범진(Bum-Jin Park) 충남대학교 농업과학연구소 2011 농업과학연구 Vol.38 No.1
In forest work, working conditions are very hard to improve. The proper distribution of work time and good posture is believed to bring about direct improvements such as accident prevention. On this, this study has analyzed forest workers’ posture and their working hours in order to improve their working conditions in stone channel work. Authors has chosen several core elements of stone channel work to focus on, which include stone masonry, excavation of bed, moving stone, directing work, choosing stone, and breaking stone. The ratio of real working time over total working time was shown as 84.6%. As for the time ratio of each elemental work over the real working time, the stone masonry was 60.4%, the directing work was 15.1%, moving stone was 12.1%, choosing stone was 7.1%, breaking stone was 3.3%, and excavation of bed was 2.0%. According to the analytical results provided by OWAS, the ratio of category Ⅲ (Work posture has a distinctly harmful effect on the musculoskeletal system) has shown that moving stone turned out 65.2%, choosing stone was 61.5%, stone masonry was 46.1%, breaking stone was 14.3%, excavation of bed was 12.5% and directing work was 6.8%. Furthermore, the ratio of category Ⅳ (Work posture with an extremely harmful effect on the musculoskeletal system) has shown that excavation of bed turned out 37.5%, breaking stone was 28.6%, stone masonry was 27.3%, choosing stone was 7.7%, moving stone was 6.1% and directing working was 4.5%. These results are expected to be utilized for the improvement with respect to both working methods in the stone channel work and the workers’ working posture.
구창덕 ( Chang Duck Koo ),이화용 ( Hwa Yong Lee ),이희수 ( Hee Su Lee ),박용우 ( Yong Woo Park ),김재수 ( Je Su Kim ) 한국산림과학회 2015 한국산림과학회지 Vol.104 No.3
The process of cultivation and production of oak mushroom (Lentinula edodes (Berk.) Pegler) on sawdust surface beds were investigated. Sawdust surface bed cultivation is the method by which oak mushrooms are cultured and produced on sterilized sawdust surface bed without using bags. The bed was made by inoculating with 3 to 1 ratio of bed sawdust to oak mushroom mycelial inoculum. The sawdust bed medium with 65% water content was pasteurized at 65℃, inoculated with sawdust spawn and spread on the surface on vinyl film in cultivation shed. During 78 days of cultivation period, water content in the medium varied from 61 to 72%, its pH decreased from 5.6 to 3.9~4.6 and ergosterol concentration increased to 0.33~0.59 μg/g. CO2 concentration in the medium rapidly increased to 8.06% in two weeks. In seven weeks the medium surface started browning and CO2 concentration increased to about 5.63%. Until 11th week the CO2 concentration was maintained at 6~7%. After removing the plastic cover on the bed for ventilation in 12 weeks, CO2 within the bed reduced dramatically to 1.5%. In the cultivation shed the internal temperature was 7.1~29℃ and humidity was 27.3 to 100%, while bed temperature ranged 11.6~30℃. Oak mushroom fruiting started from late July, in 120 days after bed establishment in late March and continued for approximately 100 days until early December with eight cycles of irrigation treatment. The mushroom yield of the eight cycles were 288~352 kg during the 1st (7/29~8/4) to 3rd cycle (9/3~9/7), 800 kg at the 4th cycle (9/19~9/24), 1,296~1,853 kg during 5th (10/3~10/ 8) to 7th cycle (4.11~11/9) and 990 kg at 8th cycle (11/23~12/7). Total production was approximately 7.4 tons from 33.0 tons of oak sawdust medium, thus harvest efficiency of the mushroom production was approximately 22.4%.