Feasibility of Breast-Conserving Therapy for Younger Women With Breast Cancer

Guenther, J. Michael,Kirgan, Daniel M.,Giuliano, Armando MediMedia Korea 1996 JAMA-Korea Vol.11 No.10

An evaluation of ozone dry deposition simulations in East Asia

Park, R. J.,Hong, S. K.,Kwon, H.-A.,Kim, S.,Guenther, A.,Woo, J.-H.,Loughner, C. P. Copernicus GmbH 2014 Atmospheric Chemistry and Physics Vol.14 No.15

<P>Abstract. We use a 3-D regional atmospheric chemistry transport model (WRF-Chem) to examine ozone dry deposition in East Asia, which is an important but uncertain research area because of insufficient observation and numerical studies focusing on East Asia. Here we compare two widely used dry deposition parameterization schemes, the Wesely and M3DRY schemes, which are used in the WRF-Chem and Community Multiscale Air Quality (CMAQ) models, respectively. Simulated ozone dry deposition velocities with the two schemes under identical meteorological conditions show considerable differences (a factor of 2) owing to surface resistance parameterization discrepancies. Resulting ozone concentrations differ by up to 10 ppbv for a monthly mean in May when the peak ozone typically occurs in East Asia. An evaluation of the simulated dry deposition velocities shows that the Wesely scheme calculates values with more pronounced diurnal variation than the M3DRY and results in a good agreement with the observations. However, we find significant changes in simulated ozone concentrations using the Wesely scheme but with different surface type data sets, indicating the high sensitivity of ozone deposition calculations to the input data. The need is high for observations to constrain the dry deposition parameterization and its input data to improve the use of air quality models for East Asia. </P>

선진 자동차 재제조 산업 분석을 통한 국내 산업에의 시사점 : 교류발전기와 시동전동기를 중심으로

김형주(H. J. Kim),Guenther Seliger,정남훈(N. H. Chung),이한홍(H.H. Lee) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월

Post industrial technologies have improved human standard of living, however, a host of negative environmental consequences from the unlimited industrial appetite have posed serious global challenges. Remanufacturing is an industrial manufacturing process that is to restore old products to perform like a new and to save energy, natural resources, landfill space and to reduce air pollution by less re-smelting. By extending product life cycle, remanufacturing gives us enormous opportunities for sustainable development of our society. This paper introduces current state of the art and future perspective in the field of automotive remanufacturing focusing on alternator and start motor. The results could be used as a basic information for further remanufacturing applications in Korea.

고기 유화물의 첨가가 재구성 쇠고기 스테이크의 추출단백질 , 결착력 , 외관및 관능특성에 미치는 영향

최양일(Y . I . Choi),(J . J . Guenther) 한국축산학회 1988 한국축산학회지 Vol.30 No.12

This study was carried out to evaluate the effect of emulsion addition (0, 1, 3 or 5 %) on exudate proteins, binding, visual and sensory characteristics of restructured beef steaks. As emulsion level increased from 1 to 3%, exudate protein(P$lt;0.05) at bond area and myofibrillar protein concentration in exudate protein increased to result in more(P$lt;0.05) desirable texture in final steaks. As emulsion level increased from 3 to 5 %, more (P$lt;0.05) discoloration and dark color developed in surface color of steaks containing 5 % emulsion. However, there were no differences (P$gt;0.05) in cooked color among emulsion levels. Emulsion had no effect(P$gt;0.05) on tenderness, cooking loss, moisture, fat, TBA and total aerobic count of steaks. The results of this study indicated that acceptable restructured beef steaks could be processed with 3 % added emulsion. More research needs to investigate the effect of emulsion addition on the quality of precooked, restructured meat products.

식생 정보의 변화에 따른 국내 이소프렌 배출량 검증 및 그 변화가 지상 오존 농도 모의에 미치는 영향

장희수,박록진,김현국,Alex B. Guenther,Donald R. Blake,Andrew J. Weinheimer 한국기상학회 2018 한국기상학회 학술대회 논문집 Vol.2018 No.10

Impact of isoprene and HONO chemistry on ozone and OVOC formation in a semirural South Korean forest

Kim, S.,Kim, S.-Y.,Lee, M.,Shim, H.,Wolfe, G. M.,Guenther, A. B.,He, A.,Hong, Y.,Han, J. Copernicus GmbH 2015 Atmospheric Chemistry and Physics Vol.15 No.8

<P>Abstract. Rapid urbanization and economic development in East Asia in past decades has led to photochemical air pollution problems such as excess photochemical ozone and aerosol formation. Asian megacities such as Seoul, Tokyo, Shanghai, Guangzhou, and Beijing are surrounded by densely forested areas, and recent research has consistently demonstrated the importance of biogenic volatile organic compounds (VOCs) from vegetation in determining oxidation capacity in the suburban Asian megacity regions. Uncertainties in constraining tropospheric oxidation capacity, dominated by hydroxyl radical, undermine our ability to assess regional photochemical air pollution problems. We present an observational data set of CO, NOx, SO2, ozone, HONO, and VOCs (anthropogenic and biogenic) from Taehwa research forest (TRF) near the Seoul metropolitan area in early June 2012. The data show that TRF is influenced both by aged pollution and fresh biogenic volatile organic compound emissions. With the data set, we diagnose HOx (OH, HO2, and RO2) distributions calculated using the University of Washington chemical box model (UWCM v2.1) with near-explicit VOC oxidation mechanisms from MCM v3.2 (Master Chemical Mechanism). Uncertainty from unconstrained HONO sources and radical recycling processes highlighted in recent studies is examined using multiple model simulations with different model constraints. The results suggest that (1) different model simulation scenarios cause systematic differences in HOx distributions, especially OH levels (up to 2.5 times), and (2) radical destruction (HO2 + HO2 or HO2 + RO2) could be more efficient than radical recycling (RO2 + NO), especially in the afternoon. Implications of the uncertainties in radical chemistry are discussed with respect to ozone-VOC-NOx sensitivity and VOC oxidation product formation rates. Overall, the NOx limited regime is assessed except for the morning hours (8 a.m. to 12 p.m. local standard time), but the degree of sensitivity can significantly vary depending on the model scenarios. The model results also suggest that RO2 levels are positively correlated with oxygenated VOCs (OVOCs) production that is not routinely constrained by observations. These unconstrained OVOCs can cause higher-than-expected OH loss rates (missing OH reactivity) and secondary organic aerosol formation. The series of modeling experiments constrained by observations strongly urge observational constraint of the radical pool to enable precise understanding of regional photochemical pollution problems in the East Asian megacity region. </P>

Impact of biogenic volatile organic compounds on ozone production at the Taehwa Research Forest near Seoul, South Korea

Kim, S.Y.,Jiang, X.,Lee, M.,Turnipseed, A.,Guenther, A.,Kim, J.C.,Lee, S.J.,Kim, S. Pergamon Press ; Elsevier [distribution] 2013 Atmospheric environment Vol.70 No.-

The importance of biogenic volatile organic compounds (BVOCs) in understanding of air-quality and climate on regional to global scales has been highlighted in a number of modeling and observational studies. At the same time, another important emerging research topic in atmospheric chemistry is the regional and global impacts of fast growing East Asian megacities. These two research topics must be integrated in order to adequately understand and address air quality challenges emerging from Eastern Asian megacities surrounded by planted or natural forest areas. We present initial measurement results for May, June and September 2011 from the Taehwa Research Forest (TRF) which has been developed to serve as a long term observatory for investigating biosphere-atmosphere interactions at the edge of the Seoul Metropolitan Area (population of ~23.5 million). The comprehensive measurement datasets of ozone and its precursors such as CO, NO<SUB>x</SUB>, SO<SUB>2</SUB> and VOCs shows that high ozone episodes in the suburban site could not be explained by just anthropogenic pollutants alone. In addition, isoprene (C<SUB>5</SUB>H<SUB>8</SUB>) and monoterpenes (C<SUB>10</SUB>H<SUB>16</SUB>) were observed as two of the most important OH chemical sinks inside of the forest canopy. In order to understand the impacts of these BVOCs on ozone and related photochemistry, we conducted model sensitivity simulations using a coupled meteorology-chemistry model (WRF-Chem) for conditions including with and without BVOC emissions. The modeling results suggest that BVOC emissions could enhance regional daytime ozone production from 5 to 20 ppbv. The observed temporal variations in ozone correspond well with the variations in BVOCs, which likely reflects the influence of BVOCs on ozone formation. These findings strongly suggest that interactions between anthropogenic pollutants and BVOCs must be understood and quantified in order to assess photochemical ozone formation in the regions surrounding East Asian megacities.