Thinning Effects on Litterfall Inputs and Litter Decomposition in Pinus densiflora S. et Z. and Quercus variabilis Blume Stands

백경원,백경린,Hojin Kim,이지현,김형섭,김춘식 강원대학교 산림과학연구소 2022 Journal of Forest Science Vol.38 No.1

This study was conducted to examine litter inputs and litter decomposition rates following thinning, which is among the most important forest management activities that enhance the beneficial functions in Korean forests. Litter inputs and litter decomposition rates following a 2-year elapse from thinning in Pinus densiflora and following a 7-year elapse from thinning in Quercus variabilis stands were measured for 2 years from 16 sites in three regions (Sancheong-gun, Uiryeong-gun, and Jinju-si) in Gyeongsangnam-do, Korea. Annual needle litter inputs in P. densiflora stands were significantly decreased following thinning, whereas annual broadleaved leaf litter inputs in Q. variabilis stands were not significantly different between thinned and unthinned treatments. The annual mean total litter inputs in both tree species were significantly lower in the thinned (P. densiflora : 3,653 kg ha-1 year-1; Q. variabilis: 4,963 kg ha-1 year-1) compared to the unthinned stands (P. densiflora: 5,138 kg ha-1 year-1; Q. variabilis: 5,997 kg ha-1 year-1) during the study period. The mass loss rates from decomposing needle litter in P. densiflora stands were significantly lower (p<0.05) in the thinned stands than in the unthinned stands for two sampling dates of the eight included in the study, whereas the decomposition rates from decomposing leaf litter in Q. variabilis stands were not affected by thinning. The results indicate that thinning effects on total litter inputs remained clear following a 2-year elapse from thinning in P. densiflora stands and following a 7-year elapse from thinning in Q. variabilis stands.

Phosphorus and Base Cation Inputs through Litterfall Components in Pine Forests after Tree Removal Due to Pine Wilt Disease Disturbance

백경원,김성준,김춘식 한국산림과학회 2019 한국산림과학회지 Vol.108 No.3

This study was conducted to measure litterfall and nutrient (P, K, Ca, Mg) inputs under varying degrees of disturbance by pine wilt disease in pine forests in southern Korea. Litterfall was collected to evaluate nutrient responses at different intensities of disturbance (various levels of basal area) by pine wilt disease across 2 years. Phosphorus, Ca, and Mg concentrations in needle litterfall were positively correlated (p < 0.05) with decreased disturbance intensities (increased basal area) depending on the time of sampling, whereas the nutrient concentrations in other litterfall components (branches, bark, reproductive organs, and miscellaneous litterfall) were not significantly correlated (p > 0.05) with the intensity of pine wilt disease disturbance. Dry weight and nutrient inputs through litterfall components decreased linearly with increasing intensity of disturbance by pine wilt disease (p < 0.05), except for the nutrient inputs of branch (K, Ca, Mg) and reproductive organ (K, Ca) litterfall. These results indicate that decreased litterfall across different levels of disturbance may be related to the reduced soil nutrients in pine wilt disease forests.

만성질환을 가진 아동과 가족의 극복력

백경원,최미혜 한국아동간호학회 2006 Child Health Nursing Research Vol.12 No.2

=Resilience in Children with Chronic Illness and in Their Families

Paraneoplastic Neuromyelitis Optica Associated with Lung Adenocarcinoma in a Young Woman

백경원,김세훈,신하영 대한신경과학회 2018 Journal of Clinical Neurology Vol.14 No.2

Urban Air Mobility에 대한 법률상 항공보험가입의무 적용에 관한 연구

백경원,황호원 한국항공우주정책⋅법학회 2021 한국항공우주정책·법학회지 Vol.36 No.3

On June 4, 2020, the government announced a roadmap to start commercializing Urban Air Mobility from 2025. As a new approach to solving the traffic congestion in the congested city center, air traffic through the air of the city is made available to the public transportation. However, once an accident occurs during the flight of UAM, a transportation system that moves in the airspace of the city at a low altitude(approximately 984-1968ft or 300-600m), the discussion about the responsibility remains in a state of principle. If UAM operators, that is, those who will be operating UAM transportation business and UAM traffic management business, are liable for damages due to an aviation safety accident, a method must be secured so that the victim can receive compensation for damages in a stable manner. To this end, it was first considered that the vehicle called eVTOL to be used for UAM corresponds to an “aircraft” under the Aviation Safety Act, and the UAM business is considered to be an airline business using aircraft under the Aviation Business Act. Furthermore, in the case of commercial activities for profit using an aircraft, it is applied to the air transport service of the Commercial Act. In addition, according to Article 70 of the Airline Business Act, in order to operate an airline business, it is compulsory to purchase aviation liability insurance. It was proposed to revise the Aviation Business Act and the Commercial Act to include UAM as the subject of such aviation insurance obligations to strengthen the responsibilities of air carriers, etc. 정부는 2020년 6월4일 도심항공교통(Urban Air Mobility)을 2025년부터 상용화를 시작하겠다는 로드맵을 발표했다. 혼잡한 도심의 교통난을 해소하기 위한 새로운 접근으로 도심의 공중을 이용한 항공교통을 대중이 이용할 수 있도록 하는 것이다. 그런데 도심의 공중을 낮은 고도(약 300-600m)에서 이동하는 교통시스템인 UAM이 비행 중 사고등이 발생하였을 때 그 책임에 대한 논의는 원론적인 상태에 머물러 있는 상황이다. UAM사업 즉 UAM운송사업과 UAM교통관리사업등을 영위하게 될 자가 항공안전사고로 인해 손해배상책임이 발생할 경우, 피해자가 손해배상을 안정적으로 받을 수 있는 방법을 확보해야한다. 이를 위하여 우선 UAM에 이용될 eVTOL이라는 비행체가 항공안전법상 “항공기”에 해당함을 고찰하였고, UAM사업이 항공사업법상 항공기를 이용한 항공사업에 해당한다고 보았다. 나아가 항공기를 이용하여 영리를 목적으로 하는 상행위를 하는 경우 상법의 항공운송편에 적용을 받도록 하고 있는데, UAM사업자 등이 상법의 항공운송편의 적용을 받아 항공사고에 대한 손해배상책임을 지게 됨을 살펴보았다. 또한 항공사업법 제70조에 따르면 항공사업을 하기 위해서는 항공보험을 의무가입해야한다. 이러한 항공보험의무가입대상으로 UAM을 포함시켜항송운송인등의 책임을 강화하도록 항공사업법 및 상법을 개정하는 의견을 제시하였다.

청소년 건강증진교육을 위한 비만여부에 따른 당뇨병 관련 건강행태

백경원,전기홍 한국학교보건학회 2008 韓國學校保健學會誌 Vol.21 No.2

Purpose: Several health behavior factors affect the incidence of type 2 diabetes. Especially obesity which causes insulin resistance is the most important determinant of diabetes. Therefore, we expect the risk factors associated with insulin resistance and type 2 diabetes are affected by obesity and additionally, the related factors with diabetes caused by obesity can be controlled. Methods: This study used data collected from the 2001 Korea National Health and Nutrition Examination Survey subjects over 30 years old who had completed necessary health examinations and health behaviors survey Results: The risk factors associated with type 2 diabetes are affected by obesity. According to logistic regression diabetes regardless of sex and BMI. However drinking, smoking, total energy consumption and protein consumption BMI. Sleeping hours affected diabetes for women with obesity and Fiber consumption was a risk factor for both women and men with obesity. In addition, statistically the family history of diabetes was a significant risk factor only in the group with normal weight, not in the group with obesity Conclusion: The study results will provide information for implementing a regional initiative of type 2 diabetes prevention by BMI.

낭만과 패기를 간직한 대학생활을 돌아보면서…

백경원 대한토목학회 1996 대한토목학회지 Vol.44 No.2

원형 교각의 세굴심 산정식 개발에 대한 실험적 연구

백경원,최한규,이영섭,박수진 한국방재학회 2010 한국방재학회논문집 Vol.10 No.2

This study was intended to compare and evaluate the value obtained from the existing formula for calculating the depth of scour and the valey from experimental model through the investigation of hydraulic characteristics and pier data in the area of rivers at Gangwon Province, and the sensitivity analysis, which is a statistical method, of the elements affecting the scour of the pier was carried out. As a result, a deviation between the values of existing formulas and experimental model reached about 1.09%∼63.98%, indicating that existing formula was found not to be appropriate at the rivers in Gangwon Province. A sensitivity analysis was carried out based on value obtained from experimental model and consequently, the elements affecting the scour were size of pier accounting for 64% and water depth accounting for 36%. Finally, a formula for calculating the scour of the pattern piers at the rivers in Gangwon Province was developed using the regression analysis. 본 연구는 강원도 지방하천을 중심으로 수리특성 및 교각제원 등을 조사하여 기존 세굴심 산정식의 산정 값과 모형실험 산정 값을 비교ㆍ검토 하였으며, 교각의 세굴에 영향을 주는 인자에 대하여 통계학적 방법인 민감도 분석을 하였다. 분석결과, 기존 세굴심 산정식의 경우 전반 적으로 모형실험 측정 값 간의 편차가 1.09%∼63.98%를 보이고 있어 강원도 하천의 경우, 기존 세굴심 산정식을 적용하여 산정하기에는 적합하지 않은 것으로 판단되었다. 그리고 모형실험에 의해 산정된 측정값을 토대로 민감도 분석을 수행하였으며, 교각크기 64%, 수심 36% 순으로 세굴심 발생에 유의적인 영향을 미치는 것을 확인하였다. 끝으로 모형실험의 세굴심 산정 값을 토대로 회귀분석을 통하여 강원도 하천에 적합한 원형교각의 세굴심 산정식을 작성하였다.

Sex Difference of Type 2 Diabetes Affected by Abdominal Obesity versus Overall Obesity

백경원,전기홍 연세대학교의과대학 2010 Yonsei medical journal Vol.51 No.6

Purpose: This research compares the predictive value of the abdominal obesity indicator, waist circumference (WC), and the overall obesity indicator, body mass index (BMI), among men and women with regard to type 2 diabetes. Materials and Methods: This study used data collected from 4,400 households selected by a stratified multistage probability sampling method during the 2001 Korea National Health and Nutrition Examination Survey (KNHANES). The final study sample included 4,684 subjects over 30 years of age who had completed the health examination required for the analysis of the health interview and health behavior surveys. Results: Both men and women showed significant differences in fasting blood glucose (FBG) or HbA1c levels based on abdominal obesity irrespective of BMI. However, the presence of overall obesity among men with abdominal obesity was not significantly correlated with FBG or HbA1c levels, while the presence of overall obesity among women with abdominal obesity was significantly different in regard to FBG or HbA1c levels. Conclusion: Both WC and BMI emerged as a measures of risk factors for type 2 diabetes among women while only WC emerged as a risk factor for diabetes among men.

한강하류부 수질의 통계학적 해석

백경원,정용태,한건연,송재우 한국수자원학회 1996 물과 미래(한국수자원학회지) Vol.29 No.2

한강하류부 수질의 통계학적 해석을 통하여 수질 시계열자료의 기본 통계특성치, 지점별 및 계절별 변동성을 검토하였으며, 유량과 수질인자간의 상관성 분석을 실시하였다. 본류의 주요 6개 지점 및 3개 지류에 대한 통계특성치와 적정분포형을 산정하여 제시하였으며, 시간의존성 및 계절성을 검토하여 제시하였다. 또한, 수질 항목간의 상관성 검토를 통하여 상관성이 높은 수질, 항목간, 그리고 지점간의 상관식을 제시하였다. 추계학적 모의모형의 적용가능성을 확인하였으며, DO 항목은 전 지점간에 높은 상관성을 가지고 있었다. 유량과의 상관관계 검토에 있어서 DO, SS 항목은 유량보다는 수온에 민감하였으며, BOD, COD 항목은 유량이 적은 갈수기에는 유량에 민감한 것으로 나타났다. 수온에 밀접한 영향을 받는 DO 항목외에도 BOD, COD 항목은 계절적인 주기성을 가지고 있었으며, 상호상관 분석결과 DO, BOD, COD 항목 외의 수질 항목들에서도 각 수질 항목들에 내재된 주기성을 찾아볼 수 있었다. The characteristics of water quality in the downstream of the Han River were analyzed by statistical techniques. Basic characteristics, areal and temporal variations, and correlations of water quality data were investigated. Monthly water quality data have been investigated systematically by exploring data analysis, including time series plot, summary statistics, distribution test, time dependence test, seasonality test and flow relatedness test. Results show that water quality data in this river have seasonality. And applicability of stochastic models such as Thomas-Fiering model and ARMA(1,1) model was identified. From the examination of water quality data related to discharge, it was found that DO and SS are sensitive to water temperature rather than discharge, while BOD and COD are sensitive to discharge at dry seasons. Seasonal periodicities were identified in all water quality variables from the cross correlation analysis.