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편백림의 임분밀도 관리 기준 탐색을 통한 시업체계 개선
정수영,이광수,김현수,박준형 한국산림과학회 2024 한국산림과학회지 Vol.113 No.1
본 연구는 편백림의 생산목표 달성을 위한 생육단계별 적정 임분밀도관리 기준을 추정하고, 이로부터 솎아베기 적정 시업체계를 개발하는데 그 목적을 두고 있다. 모집된 편백림 216개 표본점을 대상으로 임내 세장목 점유율과 임분밀도간의 관계특성을 분석하여 임분밀도 관리기준 지표로서 제시된 상대수확량지수는 Ry 0.75로 나타났다. 이로부터 기존 편백 시업체계의 생산목표별 타당성 검정을 실시한 결과, 임령 증가에 따른 솎아베기 강도의 불균형과 지위에 따른 생장속도가 반영되지 못하는 문제점이 있었다. 본 연구를 통해 작성된 생산목표별 솎아베기 시업체계에서, 대경재는 ha당 353본, 498.1 m3・ha-1 수확 가능하였으며, 중경재는 703본・ha-1, 376.2 m3・ha-1, 소경재는 1,758본・ha-1, 249.5 m3・ha-1으로나타났다. 이상의 결과로부터 작성된 시업체계는 다양한 경영 목표에 따라 일률적으로 적용할 수는 없으나, 우리나라 편백림의 생장특성을 반영한 임분밀도관리도로부터 획득된 결과로서 실증적 참조 기준을 제시하는데 본 연구의 의의가 있다. The purpose of this study was to estimate the optimal stand density criteria for each growth stage of Chamaecyparis obtusa (Siebold & Zucc.) Endl. to achieve the timber production goal for cypress forests and develop an optimal silvicultural system for forest thinning. A relative yield index (Ry) value of 0.75, presented as a stand density management criterion index, was estimated by analyzing the relationship characteristics between the composition ratio and stand density of slender trees from 216 sample plots of the recruited cypress forests. The analysis of the feasibility of achieving each production target in the existing silvicultural system for C. obtusa revealed that the growth rate according to the parameters of forest land productivity, such as site index and thinning intensity according to the increase in age, was not properly reflected. In the thinning system for each timber production target analyzed in this study, 353 high-quality large hardwoods from 498.1 m3/ha, 703 high-quality medium hardwoods from 376.2 m3/ha, and 1,758 small-diameter hardwoods from 249.5 m3/ha could be harvested. Although the silvicultural system prepared on the basis of the results of this study cannot be uniformly applied according to various management goals, this study is meaningful in that it presents empirical reference standards based on the stand density management diagram that reflects the growth characteristics of cypress forests in South Korea.
MERS-CoV Infection in a Pregnant Woman in Korea
정수영,성세인,성지희,안소윤,강은숙,장윤실,박원순,김종화 대한의학회 2017 Journal of Korean medical science Vol.32 No.10
Middle East respiratory syndrome (MERS) is a lethal respiratory disease — caused by MERS-coronavirus (MERS-CoV) which was first identified in 2012. Especially, pregnant women can be expected as highly vulnerable candidates for this viral infection. In May 2015, this virus was spread in Korea and a pregnant woman was confirmed with positive result of MERS-CoV polymerase chain reaction (PCR). Her condition was improved only with conservative treatment. After a full recovery of MERS, the patient manifested abrupt vaginal bleeding with rupture of membrane. Under an impression of placenta abruption, an emergent cesarean section was performed. Our team performed many laboratory tests related to MERS-CoV and all results were negative. We report the first case of MERS-CoV infection during pregnancy occurred outside of the Middle East. Also, this case showed relatively benign maternal course which resulted in full recovery with subsequent healthy full-term delivery without MERS-CoV transmission.
정수영,강상욱,Jeong, Sooyoung,Kang, Sang Wook 한국막학회 2017 멤브레인 Vol.27 No.4
올레핀/파라핀 분리를 위해 $Poly(ethylene oxide)(PEO)/AgBF_4/Al(NO_3)_3/Ag_2O$ 복합막이 제조되었으며, $Ag_2O$가 도입되었을 때, 복합체 분리막의 초기성능은 선택도 13.7과 투과도 21.7 GPU로 관찰되었다. $PEO/AgBF_4/Al(NO_3)_3$ 분리막의 성능(선택도 13와 투과도 7.5 GPU)에 비해서 초기성능이 증가한 이유는 $Ag_2O$의 첨가로 인한 Ag ion의 활성도 증가로 생각되었다. 하지만 시간에 따른 성능저하 현상이 관찰되었는데 이는 고분자 matrix인 PEO 때문인 것으로 생각되었다. PEO 고분자는 $Ag_2O$ 입자를 안정화 시킬 수 없기 때문에 용매가 증발하면서 $Ag_2O$ 입자끼리 뭉치게 되고, $Ag_2O$가 barrier 역할을 하게 돼서 시간이 지나면 투과도가 감소하는 것으로 분석되었다. For the separation of olefins/paraffins, $Poly(ethylene oxide)(PEO)/AgBF_4/Al(NO_3)_3/Ag_2O$ composite membranes were prepared. When $Ag_2O$ was introduced, the initial selectivity and permeance of composite membranes were observed to be 13.7 and 21.7 GPU, respectively. The increase in performance compared to the initial performance of $PEO/AgBF_4/Al(NO_3)_3$ membrane (selectivity 13 and permeance 7.5 GPU) was thought to be due to the increase of Ag ion activity due to the addition of $Ag_2O$. However, performance degradation over time was observed, which was thought to be due to the polymer matrix PEO. Since the PEO polymer could not stabilize the $Ag_2O$ particles, the $Ag_2O$ particles becmae aggregated together as the solvent evaporates, and $Ag_2O$ acts as a barrier. As a result, the permeance decreases over time.
정수영,박혜아,김명선,강준혁,백이선,이유영,김태중,이정원,김병기,배덕수,최철훈 대한암학회 2020 Cancer Research and Treatment Vol.52 No.2
Purpose Lymph node metastasis (LNM) is the most significant prognostic factor in cervical cancer that was recently incorporated into the International Federation of Gynecology and Obstetrics (FIGO) staging system. This study was performed to evaluate whether the prognostic significance of LNM differs according to disease status. Materials and Methods Patients with FIGO stage IB or higher cervical cancer who had pretreatment computed tomography and/or magnetic resonance imaging studies as well as long-term follow-up were enrolled in this retrospective study. The hazard ratio (HR) of Cox regression was used to determine the prognostic significance of LNM. The HRs were compared between the different tumor groups (based on stage, histology, tumor size, primary treatment, age, parametrium involvement, and lymphovascular space invasion). Results A total of 970 patients treated between January 1999 and December 2007 were included. The pretreatment LNM had prognostic significance in patients with stage IB1/IIA (HR for progression-free survival 2.10, p=0.001; HR for overall survival 1.99, p=0.005). However, the significance gradually decreased or disappeared with advancing stages. Similarly, the prognostic significance of the pretreatment LNM decreased with advancing disease status, including old age, parametrial involvement or lymphovascular space involvement. In contrast, the tumor size was associated with the prognostic significance of LNM with advancing status. The significance of the clinical LNM did not reflect the significance of the clinical stage. In contrast, the tumor size, parametrial involvement, and significance of the pathologic LNM reflected the clinical stage. Conclusion In patients with cervical cancer, pretreatment LNM on imaging has different clinical significance depending on the tumor status.