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- 저자 : 권효정 ( Hyo Jung Kwon ) (검색결과 52 건)
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권효정 ( Hyo Jung Kwon ) 한국농림기상학회 2011 한국농림기상학회지 Vol.13 No.2
Wet canopy evaporation (E(WC)) has been recognized as a significant component of total evapotranspiration, especially in forests and therefore it is critical to accurately assess E(WC) to understand forest hydrological cycle. In this review, I focused on the measurement methods and evaluating the magnitudes of E(WC) at diverse forest types (e.g., deciduous, coniferous, mixed, and rain forests). I also present the general issues to be considered for E(WC) measurements. The commonly used measurement methods for E(WC) include the water balance, energy balance, and the Penman-Monteith (PM) methods. The magnitudes of E(WC) ranged from 5 to 54% of precipitation based on the literature review, showing a large variation even for a similar forest type possibly related to canopy structure, rainfall intensity, and other meteorological conditions. Therefore, it is difficult to draw a general conclusion on the contribution of E(WC) to evapotranspiration from a particular forest type. Errors can arise from the measurements of precipitation (due to varying wind effect) and throughfall (due to spatial variability caused by canopy structure) for water balance method, the measurements of sensible heat flux and heat storage for energy balance method, and the estimation of aerodynamic conductance and unaccounted sensible heat advection for the PM method. For a reliable estimation of E(WC), the combination of ecohydrological and micrometeorological methods is recommended.
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권효정 ( Hyo Jung Kwon ),김준 ( Joon Kim ) 한국농림기상학회 2010 한국농림기상학회지 Vol.12 No.4
KoFlux는 한국의 주요 육상생태계와 대기간의 에너지, 물, 이산화탄소의 순환을 감시하기 위해 구축한 에디 공분산 기술을 기반으로 하는 미기상학 플럭스타워 관측지의 국내 관측망이다. KoFlux의 사명은 AsiaFlux와 동일하게 지구상의 생명의 질과 지속가능성을 보장하기 위해 아시아의 주요 생태계를 감시하고 돌보는 것이다. 구체적인 KoFlux의 목적은 (1) 생태계를 감시하고, 자료를 수집, 저장하고 배포를 가능하게 하는 하부구조와 (2) 이에 관련된 지식과 자료를 효과적으로 적용하고 배포하기 위해 정기적으로 포럼과 단기 훈련과정을 과학공동체에 제공하는 것이다. KoFlux는 아시아의 주요 육상생태계의 탄소/물/에너지 교환에 관한 생태계과학 정보와 지식을 창출하고, 과학적 연구와 적용에 있어서 다학문간 협력과 융합을 촉진하고, 지속적인 생태계 서비스를 지역사회에 제공함으로써 AsiaFlux의 비전인 사고하는 공동체, 배움의 프런티어를 추구하며 실천해 나간다. 현재 KoFlux 네트워크는 총 일곱 개의 관측지로 구성되어 있는데 국내의 경우 활엽수림, 침엽수림, 혼효림, 논과 비균질 농경지를 포함하며, 국외의 경우 남극과 북극의 툰드라 생태계에 위치해 있다. 등재된 관측지는 모두 표준화된 프로토콜을 사용하여 자료를 체계적으로 처리하고 있으며 자유롭게 자료 활용이 가능하도록 품질 검증된 플럭스 자료의 데이터베이스를 지속적으로 구축해 가고 있다. KoFlux는 정기적인 학술 논문 출판, 포럼 및 훈련과정을 통해, 네트워크를 성장시키고, 플럭스 관측 및 모델링 전문가간의 연결 및 정보교환을 위한 아고라를 제공하며, 관측 및 자료 분석을 위한 전문인력 양성을 위한 교육에 힘쓰고 있다. 그러나 이러한 지속적인 노력에도 불구하고 KoFlux에 등재된 산학연기관을 제외하고는 아직까지 네트워크의 성장이 제한되어 있는 실정이다. 이러한 학문간의 벽을 허물고, 네트워크에 대한 동반자 및 주인 의식을 고취시키기 위해 KoFlux는 2011년부터 서울대학교에 설립된 국가농림기상센터를 중심으로 NCAM의 주요 서비스를 담당하게 될 것이다. 이러한 일치된 협력은 현재의 감시 네트워크를 더욱 보강시키고, 차세대 과학자들을 길러내며, 우리 사회에 지속가능한 생태계 서비스의 제공을 보장할 수 있도록 이끌어 줄 것이다. KoFlux is a Korean network of micrometeorological tower sites that use eddy covariance methods to monitor the cycles of energy, water, and carbon dioxide between the atmosphere and the key terrestrial ecosystems in Korea. KoFlux embraces the mission of AsiaFlux, i.e. to bring Asia`s key ecosystems under observation to ensure quality and sustainability of life on earth. The main purposes of KoFlux are to provide (1) an infrastructure to monitor, compile, archive and distribute data for the science community and (2) a forum and short courses for the application and distribution of knowledge and data between scientists including practitioners. The KoFlux community pursues the vision of AsiaFlux, i.e., thinking community, learning frontiers by creating information and knowledge of ecosystem science on carbon, water and energy exchanges in key terrestrial ecosystems in Asia, by promoting multidisciplinary cooperations and integration of scientific researches and practices, and by providing the local communities with sustainable ecosystem services. Currently, KoFlux has seven sites in key terrestrial ecosystems (i.e., five sites in Korea and two sites in the Arctic and Antarctic). KoFlux has systemized a standardized data processing based on scrutiny of the data observed from these ecosystems and synthesized the processed data for constructing database for further uses with open access. Through publications, workshops, and training courses on a regular basis, KoFlux has provided an agora for building networks, exchanging information among flux measurement and modelling experts, and educating scientists in flux measurement and data analysis. Despite such persistent initiatives, the collaborative networking is still limited within the KoFlux community. In order to break the walls between different disciplines and boost up partnership and ownership of the network, KoFlux will be housed in the National Center for Agro-Meteorology (NCAM) at Seoul National University in 2011 and provide several core services of NCAM. Such concerted efforts will facilitate the augmentation of the current monitoring network, the education of the next-generation scientists, and the provision of sustainable ecosystem services to our society.
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권효정 ( Hyo Jung Kwon ) 한국농림기상학회 2009 한국농림기상학회지 Vol.11 No.2
Net radiation (R(N)) is a driving force of biological and physical processes between the surface and the atmosphere and its knowledge is critical to weather forecasting and water resource management. The measurement of R(N) is, however, scarce and it is typically estimated from an empirical relationship. This study presented two different methods of R(N) estimation over three major plant functional types (i.e., a deciduous forest, a coniferous forest, and a farmland) in Korea. One is a linear regression method between R(N) and solar radiation and the other is a radiation balance method. The two methods were examined using the data collected in 2008 at the three sites. Based on the linear regression method over a year, R(N) was 70% of the incoming shortwave radiation (R(S)↓) for a deciduous forest, 79% for a coniferous forest, and 64% for a farmland, indicating that the relationship was plant functional type-specific. For the radiation balance method, the inclusion of longwave radiation component slightly improved R(N) estimations. Overall, there was a good agreement between the observed and the estimated R(N) from both methods, indicating a reliable applicability of the two methods in estimating R(N).
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권효정 ( Hyo Jung Kwon ),변재원 ( Jae Won Byun ),이정구 ( Jung Goo Lee ),김경호 ( Kyoung Ho Kim ),박은정 ( Eun Jeong Park ),이성모 ( Sung Mo Lee ),황현순 ( Hyeon Sun Hwang ) 한국가축위생학회 2003 韓國家畜衛生學會誌 Vol.26 No.1
The aim of this survey was to investigate the characteristics of outbreak farm determined as the classical swine fever(CSF) at Gangwha-gun and Seo-gu, Incheon metropolitan area from October 7 to November 25 in 2002. Sixty pigs in six different farms were confirmed to the CSF and a total of 9,106 pigs containing 3,194 related epidemiologically was slaughtered to stop spreading of the disease. Clinical signs of pigs diagnosed with the CSF were high fever, anorexia, depression, paralysis of hindlimbs, cyanosis, etc and gross lesions were typically represented with hemorrhage of submandibular and superficial lymph node, infarction of spleen, and petechial (ecchymotic) hemorrhage of kidney and skin. But some outbreak farms had not shown remarkable symptoms, so they were confused with other bacterial diseases. White blood cell (WBC) counts, the classical swine fever virus(CSFV) antigen and antibody enzyme linked immunosorbent assay(ELISA) and reverse transcriptase polymerase chain reaction (RT-PCR) results about six farms indicated that total 60 pigs were infected with the CSFV. Although the origin and infection route of the CSFV were not clear, but the transmissions between farms were mainly through indirect contact such as the movement of farm personal and vehicles from outbreak farm.
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권효정,박미선,오상연,지향,조두연,김대용,Kwon, Hyo-Jung,Park, Mi-Sun,Oh, Sang-Yeon,Jee, Hyang,Cho, Doo-Youn,Kim, Dae-Yong 대한수의학회 2005 大韓獸醫學會誌 Vol.45 No.3
A male mixed breed dog with unknown age (case 1) and 5-year-old female golden retriever (case 2) were admitted to the Department of Veterinary Pathology at College of Veterinary Medicine, Seoul National University after sudden death. At necropsy, stifle region of case 1 was replaced by coalescing firm tan nodules approximately 1-3 cm in diameter. Neoplastic nodules were also presented in the lung. In case 2, the spleen was enlarged 3-5 times its normal size and numerous firm tan nodules were noted in the kidney, pericardium, diaphragm and lymph nodes. Histopathologically, the neoplastic masses of case 1 consisted of plump spindle cells having abundant cytoplasm and indistinct cell borders that formed interlacing bundle. In case 2, the masses were consisted of round to polygonal cells with abundant eosinophilic cytoplasm and eccentric nuclei. Numerous multinucleated giant cells containing nuclei of various sizes were noted. Immunohistochemically, neoplastic cells of all two cases stained intensely with vimentin and lysozyme. Based on the gross and light microscopic findings together with immunohistochemistry, both cases were diagnosed as localized histiocytic sarcoma with pulmonary metastasis and disseminated histiocytic sarcoma, respectively.
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권효정,박수영,조광명,김홍선 ( Hyo Jung Kwon,Soo Young Park,Kwang Myeung Cho,Hong Sun Kim ) 한국물환경학회 1997 한국물환경학회지 Vol.13 No.1
The effects of a drop-type toilet bowl cleaner(TBC) on the activity of microorganisms of sewage treatment facilities were tested by various experiments such as biochemical methane potential(BMP) measurement, oxygen uptake rate(OUR) measurement, a semicontinuous anaerobic digestion and an activated sludge treatment experiments. The results of the BMP test showed that the methane production rate gradually decreased as the TBC concentration increased, showing little gas production above 5,000㎎/L. In the anaerobic digestion experiment, the gas production and methane content decreased when the TBC concentration in the sludge fed increased to 6,667㎎/L. The OUR test failed to show a threshold TBC concentration which influences the activity of activated sludge. However, the CSTR activated sludge study showed that the activity of the activated sludge can be affected at TBC concentrations above 5,000㎎/L.
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