몸관말의 이해도에 관한 조사 연구

원호연 (元浩淵) 관동대학교 1998 예술디자인연구논문집 Vol.1 No.-

흉통 환자의 감별 진단

원호연 대한내과학회 2018 대한내과학회 추계학술발표논문집 Vol.2018 No.2

Preeclampsia like syndrome induced by the multi-targeted kinase inhibitors, sorafenib and sunitinib treatment for advanced hepatocellular carcinoma (초)

원호연,오재원,임승택,이용강,김충기,최혜진 대한내과학회 2010 대한내과학회 추계학술발표논문집 Vol.2010 No.-

Successful Management of a Rare Case of Stent Fracture and Subsequent Migration of the Fractured Stent Segment Into the Ascending Aorta in In-Stent Restenotic Lesions of a Saphenous Vein Graft

원호연,오재원,양영준,김미현,김충기,박준범,김병극,최동훈,홍명기 대한심장학회 2012 Korean Circulation Journal Vol.42 No.1

Stent fracture is a complication following implantation of drug eluting stents and is recognized as one of the risk factors for in-stent restenosis. We present the first case of successfully managing a stent fracture and subsequent migration of the fractured stent into the ascending aorta that occurred during repeat revascularization for in-stent restenosis of an ostium of saphenous vein graft after implantation of a zotarolimus-eluting stent. Although the fractured stent segment had migrated into the ascending aorta with a pulled balloon catheter, it was successfully repositioned in the saphenous vein graft using an inflated balloon catheter. Then, the fractured stent segment was successfully connected to the residual segment of the zotarolimus-eluting stent by covering it with an additional sirolimuseluting stent.

Long Term Litter Production and Nutrient Input in Pinus densiflora Forest

원호연,이영상,한아름,김덕기 한국환경생태학회 2018 한국환경생태학회지 Vol.32 No.1

The litter production, the nutrient concentration of each component of litterfall, and the amounts of nutrient into the forest floor via litterfall were assessed for 5 years from January 2009 through December 2013 in a Pinus densiflora forest in Mt. Worak National Park. The average amounts of leaf litter, branch and bark, reproductive organs(flowers and cones), and miscellaneous categories for 5 years were 1.940 ± 0.21, 0.505 ± 0.15, 0.259 ± 0.09, and 0.737 ± 0.14 t ㏊-1 yr-1, respectively. The average percentage of leaf litter, branch and bark, reproductive organs and miscellaneous categories for 5 years were 56.4, 14.7, 7.5, and 21.4%, respectively. The amounts of total litterfall in 2009, 2010, 2011, 2012, and 2013 were 2.810, 3.796, 3.268, 3.284, and 4.045 ton ㏊-1 yr-1, respectively. The average amounts of litterfall for 5 years were 3.441 ± 0.49 ton ㏊-1 yr-1. The average amounts of N, P, K, Ca, and Mg returned to the forest floor via litterfall for 5 years in this Pinus densiflora forest were 22.73 ± 4.92, 1.05 ± 0.42, 4.26 ± 1.69, 8.48 ± 4.62, and 2.42 ± 1.01 ㎏ ㏊-1 yr-1, respectively.

Plasma Adiponectin Concentration and Its Association with Metabolic Syndrome in Patients with Heart Failure

원호연,강석민,신민정,오재원,홍남기,박성하,이상학,장양수,정남식 연세대학교의과대학 2012 Yonsei medical journal Vol.53 No.1

Purpose: Plasma adiponectin concentrations are inversely related with metabolic syndrome (MetS), and MetS is associated with increased risk for heart failure (HF). However, the relationship between adiponectin and MetS in HF remains undetermined. Therefore, we tested whether MetS was associated with the degree of plasma adiponectin concentrations in HF patients. Materials and Methods: One hundred twenty eight ambulatory HF patients with left ventricular ejection fraction of <50% (80 males, 61.8±11.9 years old) were enrolled for this cross-sectional study. Echocardiographic measurements were performed, and plasma concentrations of adiponectin, lipoproteins, apolipoproteins (apoB, apoA1) and high sensitive C-reactive protein (hsCRP) were measured. Results: Adiponectin concentrations in HF patients with MetS (n=43) were significantly lower than those without MetS (n=85) (9.7±7.0 vs. 15.8±10.9 μg/mL, p=0.001). Higher concentrations of apoB (p=0.017), apoB/A1 ratio (p<0.001), blood urea nitrogen (p=0.034), creatinine (p=0.003), and fasting insulin (p=0.004) were observed in HF patients with MetS compared with those without MetS. In HF patients with MetS, adiponectin concentrations were negatively correlated with hsCRP (r=-0.388, p=0.015) and positively correlated with the ratio of early mitral inflow velocity to early diastolic mitral annular velocity, E/E' (r=0.399, p=0.015). There was a significant trend towards decreased adiponectin concentrations with an increasing number of components of MetS (p for trend=0.012). Conclusion: Our study demonstrated that adiponectin concentrations decreased in HF patients with MetS, and that relationship between adiponectin, inflammation and abnormal diastolic function, possibly leading to the progression of HF.

월악산 신갈나무림의 유기탄소 분포와 순환을 통한 생태계서비스 가치평가

원호연,문형태,신창환 한국습지학회 2014 한국습지학회지 Vol.16 No.3

월악산국립공원에 발달되어 있는 신갈나무림에서 2012년 5월부터 2013년 4월까지 유기탄소 분포와 순환을 통한 생태계 서비스 가치를 파악하였다. 지상부와 지하부 생물량에 분포되어 있는 유기탄소량은 각각81.94 및 20.53 ton C/ha 이었으며, 낙엽층과 토양의 유기탄소량은 각각 6.49 ton C ha -1, 141.23 ton C ha-150 -depth-1 로 조사되였다. 조사지 신갈나무림의 전체 유기탄소량은 250.19 ton C ha-1 이었으며, 이중41.0%가 식물체에 분포하였다. 신갈나무림의 전체 유기탄소량을 원화로 환산하면 약 527만원 ha-1의 가치를 갖는 것으로 추정되었다. 조사기간 동안 토양호흡을 통하여 방출되는 탄소량은 7.31 ton C ha-1 yr-1으로 이중 미생물호흡과 뿌리호흡을 통해 방출되는 탄소량은 각각 3.58, 3.73 ton C ha-1 yr-1이었다. 유기탄소 순 생산량과 미생물호흡량의 차이로 추정했을 때 본 신갈나무림에서 연간 대기로부터 흡수하는 순유기탄소는 1.61 ton C ha-1 yr-1로서, 이를 원화로 환산하면 약 33,000원 -1의 가치를 갖는 것으로 추정되었다 Valuation of ecosystem services through organic carbon distribution and cycling in the Quercus mongolica forest at Mt. Worak national park were investigated from May 2012 through April 2013. The amount of carbon allocated to above and below ground biomass was 81.94 and 20.53 ton C ㏊-1. Amount of organic carbon in litter layer was 6.49 ton C ㏊-1. Amount of organic carbon within 50㎝ soil depth was 141.23 ton C ㏊-1 50㎝-depth-1. Total amount of organic carbon in this Quercus mongolica forest was estimated to 250.19 ton C ㏊-1. The estimated amount of won in this Quercus mongolica forest in terms of total organic carbon was about 5.27 million won ㏊-1. The amount of carbon evolved through soil respiration was 7.31 ton C ㏊-1 yr-1. The amount of carbon evolved through microbial respiration and root respiration was 3.58 and 3.73 ton C ㏊-1 yr-1, respectively. The amount of organic carbon absorbed from the atmosphere of this Quercus mongolica forest was 1.61 ton C ㏊-1 yr-1 when when estimated from the difference between net primary productionand microbial respiration. This amount will come to about 33,000 won ha-1 yr-1 in Korean currency.

월악산 소나무림의 유기탄소 분포와 순환을 통한 생태계서비스 가치평가

원호연,이영상,문형태 한국습지학회 2015 한국습지학회지 Vol.17 No.4

월악산국립공원에 발달되어 있는 소나무림에서 2013년 1월부터 2013년 12월까지 유기탄소 분포와 순환을 통한 생태 계 서비스 가치를 평가하였다. 지상부와 지하부 생물량에 분포되어 있는 유기탄소량은 각각 32.17 및 8.04 ton C ha-1 이었으며, 낙엽층과 토양의 유기탄소량은 각각 5.55 ton C ha-1 및 58.62 ton C ha-1 50cm-depth-1 로 조사되었다. 조사지 소나무림의 전체 유기탄소량은 104.38 ton C ha-1 이었으며, 이중 37.9%가 식물체에 분포하였다. 소나무림의 전체 유기탄소량을 원화로 환산하면 약 1,044 만원 ha-1의 가치를 갖는 것으로 추정되었다. 조사기간 동안 토양호흡을 통하여 방출되는 탄소량은 4.44 ton C ha-1 yr-1으로 이중 미생물호흡과 뿌리호흡을 통해 방출되는 탄소량은 각각 2.18 및 2.27 ton C ha-1 yr-1이었다. 유기탄소 순 생산량과 미생물호흡량의 차이로 추정했을 때 본 소나무림에서 연 간 대기로부터 흡수하는 순 유기탄소는 0.44 ton C ha-1 yr-1로서, 이를 원화로 환산하면 약 44,000원 ha-1의 가치를 갖는 것으로 추정되었다. Valuation of ecosystem services through organic carbon distribution and cycling in the Pinus densiflora forest at Mt. Worak National Park were investigated from January 2013 through December 2013. The amount of carbon allocated to above and below ground biomass was 32.17 and 8.04 ton C ha-1. Amount of organic carbon in litter layer was 5.55 ton C ha-1. Amount of organic carbon within 50cm soil depth was 58.62 ton C ha-1 50cm-depth-1. Total amount of organic carbon in this Pinus densiflora forest was estimated to 104.38 ton C ha-1. The estimated amount of won in this Pinus densiflora forest in terms of total organic carbon was about 10.44 million won ha-1. The amount of carbon evolved through soil respiration was 4.44 ton C ha-1 yr-1. The amount of carbon evolved through microbial respiration and root respiration was 2.18 and 2.27 ton C ha-1 yr-1, respectively. The amount of organic carbon absorbed from the atmosphere of this Pinus densiflora forest was 0.44 ton C ha-1 yr-1 when estimated from the difference between net primary production and microbial respiration. This amount will come to about 44,000 won ha-1 in Korean currency.

리기다소나무와 잣나무 낙엽의 분해율 및 분해과정에 따른 영양염류 함량 변화

원호연,이영상,조수언,이일환,진선덕,황소영 한국환경생태학회 2018 한국환경생태학회지 Vol.32 No.6

We examined the nutrient dynamics during the leaf litter decomposition rate and process of Pinus rigida and Pinus koraiensis in Gongju for 21 months from December 2014 to September 2016 as a part of National Long-Term Ecological Research Program in Korea. The remaining weight rate of P. rigida and P. koraiensis leaf litter was 58.27±4.13 and 54.08±4.32%, respectively, indicating that the P. koraiensis leaf litter decomposed faster than P. rigida leaf litter. The decay constant (k) of P. rigida leaf litter and P.koraiensis leaf litter after 21 months was 0.95 and 1.08, respectively, indicating that P. koraiensis leaf litter decayed faster than P. rigida leaf litter probably due to the difference of nitrogen concentration between the two. The C/N ratio of P. rigida and P. koraiensis leaf litter was 64.4 and 40.6, respectively, initially, and then decreased to 41.0 and 18.9, respectively, after 21 months. The C/P ratio of P. rigida and P. koraiensis leaf litter was 529.8 and 236.5, respectively, and then decreased to 384.1, 205.2, respectively, after 21 months. The contents of N, P, K, Ca, and Mg were 6.78, 0.83, 2.84, 0.99, and 2.59 mg/g, respectively, in the P. rigida leaf litter and 10.90, 1.87, 5.82, 4.79, and 2.00 mg/g, respectively, in the P. koraiensis leaf litter, indicating that the elements except the magnesium showed higher contents in P. koraiensis. After 21 months elapsed, remaining N, P, K, Ca, and Mg was 88.4, 77.6, 26.7, 50.5 and 44.5%, respectively, in decomposing P. rigida, and 114.4, 61.3, 7.6, 115.2 and 72.0%, respectively, decomposing P. koraiensis leaf litter. 국가장기생태연구사업의 일환으로 국내 주요 조림수종인 리기다소나무와 잣나무 낙엽의 분해율 및 분해과정에 따른영양염류 함량 변화를 파악하였다. 분해 21개월경과 후 리기다소나무 낙엽과 잣나무 낙엽의 잔존률은 각각 58.27±4.13, 54.08±4.32으로 잣나무 낙엽의 분해가 리기다소나무 낙엽보다 빠르게 진행되는 것으로 나타났다. 21개월경과 후 리기다소나무 낙엽과 잣나무 낙엽의 분해상수(k)는 각각 0.95, 1.08로 잣나무 낙엽의 분해상수가 높은 것으로 나타났다. 리기다소나무 낙엽과 잣나무 낙엽의 초기 C/N 비율은 각각 64.4, 40.6 이었으나 21개월경과 후에는 각각 41.0, 18.9로점차 감소하였고, C/P 비율은 리기다소나무 낙엽과 잣나무 낙엽에서 초기에 각각 529.8, 236.5에서 21개월경과 후384.1, 205.2로 감소하였다. 낙엽의 초기 N,P,K,Ca,Mg 함량은 리기다소나무 낙엽에서 각각 6.78, 0.83, 2.84, 0.99, 2.59 mg/g 이었으며, 잣나무 낙엽에서 각각 10.90, 1.87, 5.82, 4.79, 2.00 mg/g으로 마그네슘을 제외한 원소의 함량은잣나무에서 높았다. 21개월 경과 후 N,P,K,Ca,Mg 잔존률은 리기다소나무 낙엽에서 각각 88.4, 77.6, 26.7, 50.5, 44.5% 이었으며 잣나무 낙엽에서 각각 114.4, 61.3, 7.6, 115.2, 72.0%로 나타났다.

점봉산 신갈나무 낙엽의 분해율과 미기상요인과의 상관관계 분석

원호연,이영상,이재석,이일환 한국환경생물학회 2022 환경생물 : 환경생물학회지 Vol.40 No.4

To understand functional changes of forest ecosystems due to climate change, correlation between decomposition rate of leaf litter, an important function of forest ecosystems, and microclimatic factors was analyzed. After 48 months elapsed, percent remaining weight of Quercus mongolica leaf litter was 27.1% in the east aspect and 37.0% in the west aspects. Decay constant of Q. mongolica leaf litter was 0.33 in the east aspect and 0.25 in the west aspect after 48 months elapsed. Initial C/N ratio of Q. mongolica leaf litter was 38.5. After 48 months elapsed, C/N ratio of decomposing Q. mongolica leaf litter decreased to 13.43 in the east aspect and 16.72 in the west aspect. Average air temperature and soil temperature during the investigation period of the research site were 8.2±9.0 and 9.1±9.3 in the east and 8.5±7.4 and 9.3±7.3°C in the west aspect, respectively, with the west aspect showing higher air and soil temperatures. Soil moisture showed no significant difference between east and west aspects (average soil moisture: 19.4±11.0% vs. 20.5±5.7%). However, as a result of analyzing the correlation between decomposition rate and microclimatic factors, it was found that the decomposition rate and soil moisture has a positive correlation(r=0.426) in the east aspect but not in the west aspect. Our study shows that the correlation between decomposition rate and microclimatic factors can be significantly different depending on the direction of the aspect. 기후변화에 따른 산림생태계의 기능 변화를 파악하기 위해 산림생태계의 중요한 기능인 낙엽분해율과 미기상 요인과의 상관관계를 분석하였다. 2017년 1월부터 48개 월간 동사면과 서사면에 설치된 낙엽주머니를 통해 낙엽의 분해율을 분석하고 연구지소의 미기상요인(대기온도, 토양온도, 토양수분)을 관측하여 상관관계를 도출하였다. 48개월 경과 후 신갈나무 낙엽의 잔존율은 동사면과 서사면에서 각각 27.1±1.3%, 37.0±3.6%로 감소하였으며, 이에 따른 낙엽의 분해상수(k)는 동사면과 서사면에서 각각 0.33, 0.25로 나타났다. 신갈나무 낙엽의 초기 C/N비 율은 38.5이었으며 시간이 경과함에 따라 감소하여 48개월 경과 후 동사면과 서사면의 C/N비율은 각각 13.4, 16.7로 나타났다. 연구지소의 조사기간 동안 평균 대기온도 및 토양온도는 동사면과 서사면에서 각각 8.2±9.0, 9.1±9.3과 8.5±7.4, 9.3±7.3°C로 서사면에서 더 높게 나타났다. 토양수분의 경우, 동사면과 서사면에서 평균 19.4±11.0, 20.5±5.7%로 큰 차이를 보이지 않았으나 연간 변화 양상이 다소 다르게 나타났다. 분석된 낙엽의 분해율과 미기상 요인과의 상관관계를 분석해본 결과, 동사면에서 낙엽분해율과 토양수분이 양의 상관관계를 갖는 것으로 나타나, 낙엽분해율은 토양수분량에 영향을 받는 것으로 나타났다. 본 연구를 통해 향후 기후변화에 따른 폭우, 폭설 등의 영향이 산림생태계의 기능에 미치는 변화에 대응할 수 있는 기초자료를 제공하고자 한다.