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浦港 地域의 상수리나무 天然林 生態系의 物質生産에 關한 硏究
박관수(Gwan-Soo Park),권기원(Ki-Won Kwon),송호경(Ho-Kyung Song) 한국산림바이오에너지학회 2002 산림바이오에너지 Vol.21 No.1
경상북도 포항 지역에서 생육하는 평균 수령 37년생 상수리나무 천연림 생태계의 지상부 현존생물량 및 연순생산량을 분석하기 위해 2001년 8월에 총 10주의 표본목을 선정 벌목하였다. 수식 Wt=aDb 를 사용하여 추정한 지상부 총 현존생물량은 115.47ton/ha으로 나타났다. 부위별 구성비는 수간목부 63.9%, 생지부 19.8%, 수피 14.0%, 그리고 잎 1.2%의 순으로 높았다. 총 연순생산량은 7.89ton/ha이었으며, 부위별 구성비는 현존생물량의 경우와는 다르게 수간목부, 수피, 생지부, 그리고 잎의 순 이었다.<br/> This study was carried out to estimate aboveground biomass and net primary production in an average 37-year-old Quercus acutissima stand of Pohang area. Ten sample trees were cut in the forest and soil samples were collected in August, 2001. Estimation for aboveground biomass and net primary production was made by the equation model Wt=aDb where Wt is ovendry weight in kg and D is DBH in cm. Total aboveground biomass was 115.47ton/ha in the study forest. The proportion of each tree component to total aboveground biomass was high in order of bolewood(63.9%), branches(19.8%), bolebark(16.2%) and leaves(1.2%) in the study forest. Aboveground total net primary production was estimated at 7.89ton/ha in the study area.<br/>
영구자석기기의 히스테리시스 특성해석을 위한 Preisach 모델
박관수(Gwan-soo Park),한송엽(Song-yop Hahn),이기식(Ki-sik Lee),정현교(Hyun-kyo Jung) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.2
Magnetization of permanent magnet in the strong magnetic field is changeable. So the change of magnetization must be considered for the accurate analysis of the system with permanent magnets. But the hysteresis characteristice of permanent magnet cannot be represented in simple mathematical form. In this paper, Preisach model combined with finite element method which can describe the hysteresis phenomena is applied to analyze the permanent magnet system. To validate the method, it is applied to the force calculations between two magnets with different coercivities and the numerical results are compared with measured data.
공주, 포항, 그리고 낭양 지역 굴참나무 천연림 생태계의 물질생산에 관한 연구
박관수(Gwan Soo Park),이승우(Sung Woo Lee) 한국산림과학회 2001 한국산림과학회지 Vol.90 No.6
This study has been carried out to estimate aboveground biomass and net primary production(NPP) in an average 41-years-old Quercus variabilis stand of Gongju area, 45-years-old Quercus variabilis stand of Pohang area, and 54-years-old Quercus variabilis stand of Yangyang area. Ten sample trees were cut in each forest and soil samples were collected in July to August, 2000. Estimation for aboveground biomass and net primary production were made by the equation model Wt=aD^b where Wt is oven dry weight in ㎏ and D is DBH in cm. Total aboveground biomass was 91.31ton/㏊ in Gongju area, 207.6ton/㏊ in Pohang area, and 71.39ton/㏊ in Yangyang area. The aboveground biomass 207.6ton/㏊ in Pohang area is the highest biomass production among the amount of biomass in Quercus variabils stands reported in Korea. The proportion of each tree component to total aboveground biomass was high in order of bolewood, bolebark, branches and leaves in the three forests. Aboveground total net primary production was estimated at 7.8ton/㏊ in Gongju area, 11.5ton/㏊ in Pohang area, and 6.40ton/㏊ in Yangyang area. There were at least 2 times higher total aboveground biomass in Pohang area than in the Gongju and Yangyang areas because of climate difference among the study areas.
박관수(Gwan-soo Park),이향범(Hyang-beom Lee),배동진(Dong-jin Bae),한송엽(Song-yop Hahn),최홍순(Hong-soo Choi),홍정표(Jung-pyo Hong),주관정(Kwan-jeong Joo) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.2
The characteristics of electromagnetic devices with permanent magnet depends greatly on the remanence pattern of permanent magnet. So, it is necessary to analyze the pattern of remanence in permanent magnet. This paper presents a finite element analysis of magnetizer considering the nonlinearity and anisotropy of yoke and magnet in magnetizer. The distributions of magnetizations are obtained according to the variations of magnetizing currents for two kinds of magnetizers with different magnetizing poles. It is found that the excessive magnetizing current results in the reduction and polarity reversion of magnetization in the multi-pole magnetizing system where the pole angle is too small. During the design and analyzing of multi-pole magnetizer, it must be considered that there exists an optimal value of magnetizing current and pole angle of magnetizer.
충주지역의 신갈나무와 굴참나무 천연림 생태계의 지상부 및 토양 중 탄소고정에 관한 연구
박관수(Gwan Soo Park) 한국산림과학회 1999 한국산림과학회지 Vol.88 No.1
This study has been carried out to estimate aboveground and soil carbon contents in an average 39-year-old Quercus mongolica and 40-year-old Quercus variabilis stands in Chungju, Chungbuk. Ten sample trees were cut in each forest and soil samples were collected. Aboveground carbon content was estimated by the equation model Wt=aD^b where Wt is oven-dry weight in ㎏ and D is DBH in cm. Total aboveground carbon content was 48.85tonC/㏊ in Quercus mongolica stand and 57.49tonC/㏊ in Quercus variabilis stand. The proportion of each tree component to total aboveground carbon content was high in order of bolewood, branches, bolebark, and leaves in the two forests. Aboveground net primary production was estimated at 5.88tonC/㏊ in Quercus mongolica stand and 5.12tonC/㏊ in Quercus variabilis stand. Soil carbon content was 67.0tonC/㏊ in Quercus mongolica stand, 67.8tonC/㏊ in Quercus variabilis stand, and 54.7tonC/㏊ in Pinus densiflora stand. There was no significant difference in soil carbon content among the three forests.