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중부지방 소나무와 참나무류의 반경생장량과 지형, 기후 인자의 관계
변재균 ( Jae Gyun Byun ),이우균 ( Woo Kyun Lee ),노대균 ( Dae Kyun Nor ),김성호 ( Sung Ho Kim ),최정기 ( Jung Kee Choi ),이영진 ( Young Jin Lee ) 한국산림과학회 2010 한국산림과학회지 Vol.99 No.6
This study analyzed the impact of climatic and topographic factors on tree radial growth of Pinus densiflora and Quercus spp. in central regions of Korea. To find the relationship between annual tree radial growth and climatic factors, we took the core samples from individual trees and measured the tree radial width. On the assumption that the tree radial growth is related to the tree age, we estimated the radial growth by the tree age as an independent variable. Also, we estimated the standard growth, defined as the radial growth of trees aged 30. As results, we found the spatial auto-correlation in the radial growth of the red pine. Moreover, we also found the relationships between climatic and topographic and the standard growth using the GAM (Generalized Additive Model). Increase of temperature has negative impacts on the radial growth of Pinus densiflora, while it has positive impacts on the radial growth of Quercus spp.. On the other hands, increase of precipitation has negative impacts on the radial growth of both species. Lastly, we predicted the spatial distribution changes of Pinus densiflora and Quercus spp. using the temperature increase scenario and the Geographic Information System (GIS) based forest type map. We could predict that Pinus densiflora is more vulnerable than Quercus spp. to climate change so that the habitats of Pinus densiflora will be gradually changed to the habitats of Quercus spp. in eastern coastal and southern regions of Korea after 60 years.
Chung, Jae-Seung,Son, Nak Hoon,Lee, Sang Eun,Hong, Sung Kyu,Jeong, Chang Wook,Kwak, Cheol,Kim, Hyeon Hoe,Hong, Sung Hoo,Kim, Yong June,Kang, Seok Ho,Chung, Jinsoo,Kwon, Tae Gyun,Hwang, Eu Chang,Byun, The Korean Academy of Medical Sciences 2018 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.33 No.43
<P><B>Background</B></P><P>To examine survival rates and renal function after partial nephrectomy (PN) and radical nephrectomy (RN) in patients with chronic kidney disease (CKD).</P><P><B>Methods</B></P><P>We studied 4,332 patients who underwent PN or RN for pathological T1a-T2N0M0 renal cell carcinoma from 1988 to 2014. Patients were divided into two subgroups of CKD stage I–II and stage III. Kidney function, and survival outcomes were compared between groups.</P><P><B>Results</B></P><P>We included 1,756 patients with CKD I–II and 276 patients with CKD III in the final pair-matched analysis. Kidney function was significantly better preserved in the PN than in the RN group among all patients. However, the beneficial effect of PN on kidney function gradually disappeared over time in CKD III patients. The 5-year overall survival (OS) rates after PN and RN differed in patients with CKD I–II disease (99.4% vs. 96.5%, respectively, <I>P</I> = 0.015). The 5-year OS rates after surgery were not affected by mode of nephrectomy in CKD III patients (97.8% vs. 93.5%, <I>P</I> = 0.103). The 5-year cancer-specific survival rates did not differ between treatment groups in all CKD stage. Cox hazard analysis showed that the operative method was a significant factor for OS in CKD I–II patients (hazard ratio [HR], 0.320; confidence interval [CI], 0.122–0.840; <I>P</I> = 0.021). However, PN was not beneficial in terms of OS in CKD III patients (HR, 0.395; CI, 0.086–1.172; <I>P</I> = 0.117).</P><P><B>Conclusion</B></P><P>PN is associated with a higher OS rate and better kidney function in patients with preoperative CKD stage I and II, but not in those with CKD stage III.</P>
단일 전력단을 갖는 고역률 형광등용 전자식 안정기에 대한 특성해석
서철식(Cheoi-sik Seo),박재욱(Jae-Wook Park),김동희(Dong-Hee Kim),노채균(Chae-Gyun Ro),변영복(Young-Bok Byun),서진우(Jin-Woo Seo) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
A Novel high-power-factor electronic ballast for fluorescent lamps is presented in this paper. The proposed topology is based on integrahon of two-boost converter and a half-bridge parallel resonant converter.<br/> A ballast is obtained by simple construction, because full-bridge rectifier diode is eliminated and self oscillating technique is used to resonant converter. Using two-boost converter operating positive and negative half cycle respectively at line frequency (60Hz), operating in discontinuous conduction mode performs high power factor. The simulated and experimental results for 32W fluorescent lamps 110V utility line have been obtained, which verify the theoretical analysis
2009년 국내 Influenza A의 대유행과 급성 A형간염 발병률의 감소
김부성 ( Boo Sung Kim ),박재우 ( Park jae woo ),변진명 ( Jin Myung Byun ),김상균 ( Sang Gyune Kim ),( Yuan Yuan Zhang ),김영석 ( Young Seok Kim ),정승원 ( Soung Won Jeong ),장재영 ( Jae Young Jang ),홍수진 ( Soo Jin Hong ),문 대한소화기학회 2012 대한소화기학회지 Vol.59 No.5
Background/Aims: There was a spiking incidence of acute hepatitis A (AHA) in 2009 summer, but it went down drastically after an outbreak of influenza A (H1N1). We assessed the relationship between 2009 H1N1 pandemic and AHA prevalence from August to December 2009. Methods: We compared AHA cases nationwide and in our hospital for the period from the latter half of 2008 to the end of 2010. H1N1 cases in our hospital from August 2009 to December 2009 were included in the study and the correlation between 2009 H1N1 pandemic and AHA prevalence was assessed. Results: The national surveillance system reported 2,233, 7,895, 15,231 and 7,660 AHA cases from 2007 to 2010, respectively. A similar trend was noted in our hospital in the same periods. Although the national total incidence was increased in 2009, it showed steep decreasing trend line in the final 21 weeks of 2009 (weeks 32-52), as compared with 2008 and 2010. The mean weekly incidence percentage (AHA cases in a week/total in a year) in weeks 32-52 of 2009 was 1.17±0.55%, significantly lower than that in 2008 and 2010 (1.61±0.43% and 1.56±0.51%; p<0.001). Furthermore, we found a significant negative correlation between 2009 H1N1 pandemic and AHA in our hospital for weeks 32-52 of 2009 (r=-0.597; p<0.001). Conclusions: The widespread occurrence of 2009 H1N1 pandemic highlighted the benefits of health care and good hygiene, such as effective hand washing and wearing of masks, which may have also interrupted hepatitis A virus transmission. (Korean J Gastroenterol 2012;59:360-365)
대규모 역삼투 해수담수화 플랜트의 에너지 소비 저감을 위한 설계 및 운전 최적화에 대한 연구
김윤환(Kim, Yun Hwan),변재은(Byun, Jae Eun),박용균(Park, Yong-Gyun) 대한토목학회 2023 대한토목학회 학술대회 Vol.2023 No.10
전 세계적으로 물에 대한 수요 증가와 기후 위기로 인한 물 부족 문제가 심각해짐에 따라, 이를 해결하기 위한 주요 대안으로 역삼투막을 이용한 해수담수화 기술이 많은 관심을 받고 있다. 하지만 역삼투막 기반 수처리 기술은 기존의 다른 기술보다 많은 에너지가 요구되며, 해수담수화 플랜트의 설계 및 구성, 그리고 운전 조건 등 다양한 요인에 영향을 받는다. 해수담수화 플랜트 성능에 영향을 미치는 대표적인 인자는 원수의 성상, 개별 단위 공정 기술, 역삼투 트레인 용량, 구성 및 운전 방법, 멤브레인 모듈 타입 및 개수, 공정 목표 회수율, 생산수 수질 등이다. 본 연구에서는 국내에서 건설 중인 대규모 해수담수화 플랜트를 대상으로 공정 시뮬레이션을 통해 에너지 소모량을 최소화할 수 있는 최적화 방안에 대한 평가를 수행하였다.
Flexible One Diode-One Phase Change Memory Array Enabled by Block Copolymer Self-Assembly
Mun, Beom Ho,You, Byoung Kuk,Yang, Se Ryeun,Yoo, Hyeon Gyun,Kim, Jong Min,Park, Woon Ik,Yin, You,Byun, Myunghwan,Jung, Yeon Sik,Lee, Keon Jae American Chemical Society 2015 ACS NANO Vol.9 No.4
<P>Flexible memory is the fundamental component for data processing, storage, and radio frequency communication in flexible electronic systems. Among several emerging memory technologies, phase-change random-access memory (PRAM) is one of the strongest candidate for next-generation nonvolatile memories due to its remarkable merits of large cycling endurance, high speed, and excellent scalability. Although there are a few approaches for flexible phase-change memory (PCM), high reset current is the biggest obstacle for the practical operation of flexible PCM devices. In this paper, we report a flexible PCM realized by incorporating nanoinsulators derived from a Si-containing block copolymer (BCP) to significantly lower the operating current of the flexible memory formed on plastic substrate. The reduction of thermal stress by BCP nanostructures enables the reliable operation of flexible PCM devices integrated with ultrathin flexible diodes during more than 100 switching cycles and 1000 bending cycles.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-4/acsnano.5b00230/production/images/medium/nn-2015-002307_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b00230'>ACS Electronic Supporting Info</A></P>
Jung Gyoohwan,Kim Jung Kwon,Jeon Seong Soo,Chung Jae Hoon,Kwak Cheol,Jeong Chang Wook,Ahn Hanjong,Joung Jae Young,Kwon Tae Gyun,Park Sung Woo,Byun Seok-Soo 대한남성과학회 2023 The World Journal of Men's Health Vol.41 No.1
Purpose: To establish a prospective registry for the active surveillance (AS) of prostate cancer (PC) using the Korean Urologi-cal Oncology Society (KUOS) database and to present interim analysis. Materials and Methods: The KUOS registry of AS for PC (KUOS-AS-PC) was organized in May 2019 and comprises multiple institutions nationwide. The eligibility criteria were as follows: patients with (1) pathologically proven PC; (2) pre-biopsy prostate-specific antigen (PSA) ≤20 ng/mL; (3) International Society of Urological Pathology (ISUP) grade 1 or 2 (no cribriform pattern 4); (4) clinical T stage ≤T2c; (5) positive core ratio ≤50%; and (6) maximal cancer involvement in the core ≤50%. Detailed longitudinal clinical information, including multi-parametric magnetic resonance imaging and disease-specific out-comes, was recorded. Results: From May 2019 to June 2021, 296 patients were enrolled, and 284 were analyzed. The mean±standard deviation (SD) age at enrollment was 68.7±8.2 years. The median follow-up period was 11.2 months (5.9–16.8 mo). Majority of pa-tients had pre-biopsy PSA ≤10 ng/mL (91.2%), PSA density <0.2 ng/mL2 (79.7%), ISUP grade group 1 (94.4%), single positive core (65.7%), maximal cancer involvement in the core ≤20% (78.1%), and clinical T stage of T1c or lower (72.9%). Fifty-two (18.3%) discontinued AS for various reasons. Interventions included radical prostatectomy (80.8%), transurethral prostatec-tomy (5.8%), primary androgen deprivation therapy (5.8%), radiation (5.8%), and focal therapy (1.9%). The mean±SD time to intervention was 8.9±5.2 months. The reasons for discontinuation included pathologic reclassification (59.6%), patient pref-erence (25.0%), and radiologic reclassification (9.6%). Two (4.8%) patients with pathologic Gleason score upgraded to ISUP grade group 4, no biochemical recurrence. Conclusions: The KUOS established a successful prospective database of PC patients undergoing AS in Korea, named the KUOS-AS-PC registry.
원발성 담즙성 간경변증으로 진단되고 자가면역성 간염의 Feature를 보이는 한국인 환자에 대한 Simplified Scoring Criteria의 의미
김민석 ( Min Suk Kim ),김영석 ( Young Seok Kim ),김상균 ( Sang Gyune Kim ),변진명 ( Jin Myung Byun ),윤라영 ( La Young Yoon ),한동훈 ( Dong Hoon Han ),문종주 ( Jong Joo Moon ),남재형 ( Jae Hyung Nam ),김태진 ( Tae Jin Kim ),이세환 대한내과학회 2013 대한내과학회지 Vol.84 No.2
목적: 원발성 담즙성 간경변증과 자가면역성 간염의 임상적, 조직학적 특징이 동시에 혼재되어 나타나는 경우가 1970년 대부터 보고되고 있다. 이를 일반적으로 중복증후군(overlap syndrome)이라고 한다. 현재까지 IAIHG에서 제시한 simplified scoring criteria를 원발성 담즙성 간경변증 환자군에서 중복 증후군을 진단하는 데 이용한 연구는 거의 없는 실정으로 본 연구에서는 simplified scoring criteria를 한국인에게 적용하여 중복증후군을 진단하는 데 있어 진단적 가치 및 유용성을 평가, 비교하고자 하였다. 방법: 2004년 11월부터 2009년 12월까지 순천향대학교 부천병원과 서울병원에서 임상양상, 생화학검사, 자가항체 및 간조직검사 결과를 통해 원발성 담즙성 간경변증으로 진단 되었던 25명의 환자를 대상으로 의무기록지를 통해 후향적으로 분석하였다. 환자군을 revised scoring criteria와 simplified scoring criteria를 각각 적용하여 중복증후군으로 진단된 군과 진단되지 못한 군으로 나누어 서로의 특성을 비교 분석하였다. 결과: simplified scoring criteria 적용 시 ANA 양성률에 있어 높은 양성률을 보여 18명에서(72%) 중복증후군에 해당되었으며 중복증후군 환자군은 원발성 담즙 간경변군과 비교하여 IgG에서 높은 수치를 나타냈으나 통계적으로 유의하진 않았다(p=0.092). 또한 중복증후군 환자군은 원발성 담즙 간경변증 환자군과 비교하여 조직학적 소견에서 섬유화가 진행된 경향(p=0.017)을 보였으며 ANA 양성률에서 높은 비율을 나타내었다(100% vs. 43%, p=0.03). 또한 양 군 간 ANA 역가를 비교하였을 때 중복증후군에서 ANA 역가가 높은 환자(ANA≥1:80)의 비율이 높은 것으로 나타났다(p=0.000, Table 6). 따라서 ANA 양성률과 역가가 중복증후군 진단에 있어 중요한 인자임을 나타내었다. 결론: 본 연구는 simplified scoring criteria를 원발성 담즙성 간경변증 한국 환자에게 적용하였을 때 중복증후군을 screening 하는 데 도움이 될 수 있다는 것을 보여주었다. Background/Aims: The diagnosis of primary billiary cirrhosis (PBC)-autoimmune hepatitis (AIH) overlap syndrome remains challenging. In 2008, a simplified scoring system was proposed by the International Autoimmune Hepatitis Group, which aimed for wider applicability in routine clinical practice. We evaluated the performance of the new simplified AIH scoring criteria as a diagnostic tool for overlap syndrome. Methods: We retrospectively reviewed the clinical histories, chemistry, autoimmune studies, and liver biopsy results of 25 patients diagnosed with PBC who visited Soonchunhyang University Hospital, Bucheon and Seoul, between November 2004 and December 2009. Parameters relevant to the revised and simplified scoring criteria were recorded, and outcomes were compared between those with and without features of overlap syndrome. Results: Of 25 patients with a definite diagnosis of PBC, five (20%) were diagnosed with overlap syndrome using the revised criteria, and 18 patients (72%) were diagnosed with the simplified criteria. Those patients diagnosed according to the simplified scoring criteria revealed an increased frequency of anti-nuclear antibody (p=0.030) and serum IgG levels (p=0.092). Additionally, advanced fibrosis was significantly more frequent in patients with overlap syndrome (p=0.017). Conclusions: The simplified scoring criteria seemed to be useful as a diagnostic tool to recognize overlap syndrome in Korea. However, a relatively small number of patients were included in our study, so further clinical trials based on larger populations should be performed. (Korean J Med 2013;84:211-220)