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송주현,권순선,김호진,이정은,윤이슬,Siswo,김현섭,윤충원 한국환경생태학회 2019 한국환경생태학회지 Vol.33 No.6
본 연구는 계룡산국립공원 공원문화유산지구로 지정된 동학사, 갑사, 신원사를 대상으로 식물사회학적 식생조사자료를바탕으로 식생구조를 파악하여 생태적 특성을 구명하여 사찰림의 생태적 보전관리 방안을 마련하는데 기초 자료를 제공하고자2018년 9월부터 2019년 5월까지 총 29개소의 산림식생조사를 수행하였다. 계층적 군집분석 결과, 느티나무-으름덩굴-황매화군락(VU1), 졸참나무-작살나무-까치박달군락(VU2), 소나무-산벚나무-쇠물푸레나무군락(VU3)으로 식생유형이 각각 구분되었으며, 각 식생단위별 지표종은 각각 12분류군, 8분류군, 6분류군으로 나타났다. 중요치 분석 결과, 모든 식생단위에서느티나무의 중요치가 가장 높게 나타났으며, 종다양도 분석 결과, 식생단위 3의 종다양도가 0.939으로 다른 식생단위와비교하였을 때 상대적으로 높게 나타났다. 식생유형과 무생물적입지환경, 생물적입지환경과의 상관관계분석을 CCA를 통해분석한 결과, 무생물적 환경인자와의 관계는 식생단위 2와 해발고도가 음의 상관관계를 가지는 경향을 보였으며, 생물적환경인자와의 관계에서는 뚜렷한 상관관계가 나타나지 않았다. This study was carried out to provide basic information for the ecological preservation management of temple forest (Donghaksa, Gapsa, Sinwonsa) by investigating the ecological characteristics of vegetation structure of the Cultural Heritage Site in Mt. Gyeryongsan National Park based on the Braun-Blanquet vegetation survey method from September 2018 to May 2019. As a result of hierarchical cluster analysis, the forest vegetation was classified into 3 vegetation units (Zelkova serrata - Akebia quinata - Kerria japonica community, VU1; Quercus serrata - Callicarpa japonica - Carpinus cordata community, VU2; and Pinus densiflora - Prunus sargentii - Fraxinus sieboldiana community, VU3). The indicator species of each vegetation unit were 12 taxa, 8 taxa, and 6 taxa, respectively. The result of the importance value analysis showed that Z. serrata had the highest importance value in all vegetation units, and the result of the species diversity analysis showed that the species diversity of VU3 was 0.939, which was relatively higher than other vegetation units. The result of the CCA of correlation between vegetation units and abiotic environmental factors showed that VU2 had a negative correlation with altitude, and biotic environmental factors had no significant correlation with vegetation units.
All Possible Hierarchical Quadratic Regressions for Response Surfaces
김성수,권순선,박성현 한국통계학회 2005 Journal of the Korean Statistical Society Vol.34 No.3
In response surfaces analysis, we often proceed by supposing that, over a limited region of factor space, a polynomial of only first or second degree might adequately approximate the true function. To find the best subset model, all possible quadratic regressions for response surfaces can be very valuable to get optimum solutions under some reasonable experimentations. However, there is a very hard computational burden to get all possible quadratic regressions. In practice, it is sufficient to consider only hierarchical models. In this paper, we propose an algorithm to get all possible hierarchical quadratic regressions for fitting response surfaces.
National Trends in Pediatric CT Scans in South Korea: A Nationwide Cohort Study
Kim Nak Tscheol,권순선,박문석,Lee Kyoung Min,성기혁 대한영상의학회 2022 대한영상의학회지 Vol.83 No.1
Purpose This study evaluated the rates and annual trends of pediatric CT scans in South Korea using a nationwide population-based database. Materials and Methods Data regarding pediatric CT scan usage between 2012 and 2017 were retrieved from the health insurance review and assessment service. Data on the age, sex, diagnosis, and the anatomical area of involved patients were also extracted. Results A total of 576376 CT examinations were performed among 58527528 children aged below 18 years (9.8 scans/1000 children), and the number of CT examinations per 1000 children was noted to have increased by 23.2% from 9.0 in 2012 to 11.0 in 2017. Specifically, the number of CT examinations increased by 32.9% for the 6–12 years of age group (7.4/1000 to 9.8/1000) and by 34.0% for the 13–18 years of age group (11.4/1000 to 15.3/1000). Moreover, majority of the CT scans were limited to the head (39.1%), followed by the extremities (32.5%) and the abdomen (13.7%). Notably, the number of extremity CT scans increased by 83.6% (2.3/1000 to 4.2/1000), and its proportion as compared to other scans increased from 25.3% to 37.7%. Conclusion CT scans in the pediatric population increased continuously from 2012 to 2017 at an annual rate of 4.4%. Therefore, physicians should balance the benefits of CT with its potential harms from associated radiation exposure in pediatric patients.
김태균,문상영,박문석,권순선,정기진,이태승,김백규,윤찬,이경민 대한의학회 2016 Journal of Korean medical science Vol.31 No.1
This study aimed to investigate factors affecting length of hospital stay and mortality of a specific group of patients with infected diabetic foot ulcer who underwent surgical drainage without major amputation, which is frequently encountered by orthopedic surgeons. Data on length of hospital stay, mortality, demographics, and other medical information were collected for 79 consecutive patients (60 men, 19 women; mean age, 66.1 [SD, 12.3] yr) with infected diabetic foot ulcer who underwent surgical drainage while retaining the heel between October 2003 and May 2013. Multiple linear regression analysis was performed to determine factors affecting length of hospital stay, while multiple Cox regression analysis was conducted to assess factors contributing to mortality. Erythrocyte sedimentation rate (ESR, P = 0.034), glycated hemoglobin (HbA1c) level (P = 0.021), body mass index (BMI, P = 0.001), and major vascular disease (cerebrovascular accident or coronary artery disease, P = 0.004) were significant factors affecting length of hospital stay, whereas age (P = 0.005) and serum blood urea nitrogen (BUN) level (P = 0.024) were significant factors contributing to mortality. In conclusion, as prognostic factors, the length of hospital stay was affected by the severity of inflammation, the recent control of blood glucose level, BMI, and major vascular disease, whereas patient mortality was affected by age and renal function in patients with infected diabetic foot ulcer undergoing surgical drainage and antibiotic treatment.
균혈증을 동반한 지역사회획득 중증패혈증환자의 예후인자: 전향 적, 관찰연구
윤영경,김민자,박대원,권순선,천병철,정희진,최준용,최희정,최영화,김효열,엄중식,김상일,송영구,백경란,김양수,김준명,손장욱 대한감염학회 2012 Infection and Chemotherapy Vol.44 No.3
Background: Characterization of clinical features of bacteremic severe sepsis acquired from the community has been inadequate; therefore, our goal in this study was to identify prognostic factors associated with outcome in patients with community-acquired bacteremic severe sepsis. Materials and Methods: Adult patients (≥18 years) with community-acquired severe sepsis in whom pathogens were identified from blood cultures were included in the study. Data were collected prospectively from 12 teaching hospitals between May,2005, and February, 2009. Data included demographic characteristics, co-morbid medical conditions, primary infection sites, sepsis severity, mortality, causative microorganisms,and the appropriateness of initial empirical antibiotic therapy. Results: During the study period, 1,152 patients were diagnosed with communityacquired severe sepsis and 422 patients were found to harbor pathogens in their blood. Among the 422 patients analyzed, 253 (60.0%) patients went into shock and 121 patients (28.7%) died during hospitalization. Risk factors, including respiratory tract infection (odds ratio [OR], 2.60; 95% confidence interval [CI], 1.11-6.09), number of organ dysfunctions (OR, 1.39; 95% CI, 1.13-1.71), and higher APACHE II scores (OR, 1.08; 95% CI, 1.03-1.13) showed an association with poor survival, whereas Escherichia coli as a pathogen (OR, 0.31; 95% CI, 0.16-0.64) showed an association with lower mortality. Conclusions: In addition to severity of illness, the primary site of infection and causative microorganisms were also identified as important prognostic factors in patients with community-acquired bacteremic severe sepsis.
잠복 맥락막신생혈관을 동반한 나이관련황반변성에서 베바시주맙 단독치료와 광역학요법 병합치료
오종현,김성우,오재령,권순선,허걸,Jong-Hyun Oh,Seong-Woo Kim,Jaeryung Oh,Soon-Sun Kwon,Kuhl Huh 대한안과학회 2013 대한안과학회지 Vol.54 No.10
Purpose: To compare clinical outcomes between intravitreal bevacizumab (IVB) monotherapy and combined therapy with half-fluence rate verteporfin photodynamic therapy (PDT) for occult choroidal neovascularization (CNV) secondary to age-related macular degeneration (AMD). Methods: Medical records were reviewed in consecutive patients who underwent IVB monotherapy or combined therapy with PDT for occult CNV secondary to AMD and had a 12-month follow-up period. After 3 consecutive monthly IVB injections, both groups were eligible for additional IVB injections when necessary. Best-corrected visual acuity (BCVA), central macular thickness (CMT), and number of additional IVB injections were compared between the groups. Results: Thirty-nine eyes underwent IVB monotherapy (IVB group) and 25 eyes underwent combined therapy (PDT+IVB group). Mean BCVA improved significantly in the PDT+IVB group (p = 0.046) and not in IVB group (p = 0.213). A significant reduction in mean CMT occurred in both groups (p < 0.001). The mean number of additional IVB injections was 1.6 ± 1.33 in the IVB group and 0.5 ± 1.01 in the PDT+IVB group (p = 0.001). There were no serious complications. Conclusions: Combined therapy with half-fluence rate PDT improved BCVA and reduced the number of additional IVB injections in the eyes with occult CNV secondary to AMD.