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토양분야 환경오염공정시험기준과 KS ISO규격의 일원화에 관한 연구
김지인 ( Ji In Kim ),김보경 ( Bo Kyong Kim ),김정화 ( Joung Hwa Kim ),이군택 ( Goon Teak Lee ),이상욱 ( Sang Uk Lee ),안문성 ( Mun Seong Ahn ),임태숙 ( Tae Sook Lim ),한진석 ( Jin Seok Han ),이원석 ( Won Seok Lee ) 한국환경분석학회 2012 환경분석과 독성보건 Vol.15 No.3
Korea has two type of the environmental official test methods, environmental standards enacted by ministry of environment (ES) and Korean industrial standard enacted by ministry of knowledge and Economy (KS), which causes the confusion of users, The main purpose of this study is to compare ES with KS and to make solutions to unify two types of standards. futhermore, We found the ways to improve ES and KS considering many countries aligned domestic standards with international standards. ES for soil quality consisted of sixty official test methods. We focused on thirty official test methods in ES except for the introduction, sampling methods and leak test methods and compared them with the corresponding KS just translated from ISO standard without any technical changes. By reviews and comparative tests between ES and KS we classified them into “No corresponding standards”, “Pre-unification completed”, “Pre-unification impossible”, “Unification completed” and “Unification impossible”. There were eighteen standards possible to unify, six standards impossible to unify and six standards corresponding no KS. We suggested that ESs for CN, phenols and Cr6+ were needed to adopt parts of the procedures in KS for improving recoveries and reducing the pre-treatment time and labor. We also found that both standards had to include detailed information about wavelength to analyze metals for user`s convenience.
원발성 자연기흉환자에서 비데오 흉강경과 액와부 소절개술의 비교
김정택,김광호 梨花女子大學校 醫科大學 醫科學硏究所 1994 EMJ (Ewha medical journal) Vol.17 No.3
Video-assisted thoracoscopy has recently evolved as an alternative to thoracotomy for several thoracic disorders. Spontaneous pneumothorax may be idealy srited for thoracoscopic management. We compared our results with thoracoscopic management of spontaneous pneumothorax in 19 patients with a group of 11 patients previously subjected to axillary mini-thoracotomy. Indications of operation, sex distribution, and age were similar. There were no clinical significant differences in hospital stay, duration of chest tube, duration of operation, and amounts of parenteral analgesies between two group. Although the video-assisted thoracoscopic bullectomy was sasfe, effective, and newly developed, bullectomy by axillary mini-thoracotomy was acceptible also with excellent results for the patients.
Measurement of Horizontal Coherence Using a Line Array In Shallow Water
Park, Joung-Soo,Kim, Seong-Gil,Na, Young-Nam,Kim, Young-Gyu,Oh, Teak-Hwan,Na, Jung-Yul The Acoustical Society of Korea 2003 韓國音響學會誌 Vol.22 No.e2
We analyzed the measured acoustic field to explore the characteristics of a horizontal coherence in shallow water. Signal spatial coherence data were obtained in the continental shelf off the east coast of Korea using a horizontal line array. The array was deployed on the bottom of 130 m water depth and a sound source was towed at 26 m depth in the source-receiver ranges of 1-13 ㎞. The source transmitted 200 ㎐ pure tone. Topography and temperature profiles along the source track were measured to investigate the relationship between the horizontal coherence and environment variations. The beam bearing disturbance and array signal gain degradation is examined as parameters of horizontal coherence. The results show that the bearing disturbance is about ± 8° and seems to be affected by temporal variations of temperature caused by internal waves. The array signal gains show degradation more than 5㏈ by the temporal and spatial variations of temperature and by the down-sloped topography.
Run-off Impact Assessment of the Steeped Cornfield to Small Stream
Shin, Joung-Du,Lee, Jong-Sik,Kim, Won-Il,Jung, Goo-Bok,So, Kyu-Ho,Lee, Jung-Teak,Lee, Myong-Sun The Korean Society of Environmental Agriculture 2005 한국환경농학회지 Vol.24 No.4
This experiment was conducted to evaluate the nutrient loss and to assess the eutrophication into small stream by intensive rains in the steeped cornfield during cultivation. The crop cultivated was a soiling com (DW5969), and the experimental plots were divided into two parts that were 10 and 18% of slope degrees. The amount of T-N and T-P loss was calculated by analysis of surface run-off water quality, and was investigated the effect of eutrophication to small stream as a part of life cycle assessment (LCA) methodology application. For the surface run-off water quality, EC and T-N values were highest in first runoff event as compared to the other events and maintained the stage state with litter variations at every hour during the runoff period except for EC in the slope 18%. However, T-P concentration has been a transient stage after runoff event of July 27. Total surface run-off ratio was not significantly different with slope degrees, but amount of T-N and T-P losses at 18% of slope were high as $5.96kg\;ha^{-1}\;and\;0.65kg\;ha^{-1}$ as relative to 10% of slope degree, respectively. Furthermore, T-N losses from run-off water in the sloped cornfield 10 and 18% were approximately 9.8 and 12.5% of the N applied as fertilizer when the fertilizer applied at recommended rates after soil test, respectively. For the eutrophication impact to the small stream, it was shown that $PO_4$ equivalence and Eco-indicator value at 18% of slope degree were greater as much $6.11kg\;ha^{-1}$ and 0.81 as compared to the slope angle 10%, respectively. Therefore, it was appeared that each effect of nutrient losses, eutrophication and Eco-indicator value was enhanced according with higher slope degree.
태양광발전 효율향상을 위한 목표온도 추적식 냉각수 분사시스템 제어방법
정채봉 ( Che-bong Joung ),장성택 ( Seong-teak Jang ),이충식 ( Chung-sik Lee ),김태진 ( Tae-jin Kim ),김영근 ( Young-geun Kim ) 한국구조물진단유지관리공학회 2017 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.21 No.2
As the Photovoltaic system market increases, various technologies are emerging to improve system operation efficiency. Such additional systems of the power generation system are generally referred to as ‘Balance of System’, for example a panel cooling, a panel cleaning and a panel angle adjusting apparatus. In this paper, we discuss an algorithm to calculate the target temperature of cooling in response to changes in the installation environment conditions of the power generation system so that the efficiency improvement rate target set by the user can be achieved with respect to the control method of the cooling water injection system among various panel cooling apparatuses. In order to calculate the target temperature of cooling, the output enhancement coefficient is calculated experimentally based on the temperature change according to the solar radiation condition of the PV panel, and the required reduction temperature of each irradiation condition is calculated considering the efficiency improvement rate. In addition, the efficiency improvement ratio is calculated considering the installation condition of the general power generation system without a separate control group. The thermal performance coefficient of the PV panel test body for calculating the expected temperature of the PV panel is calculated experimentally. The target temperature of cooling is calculated as the sum of the expected temperature of the PV panel and the required reduction temperature, and the injection system that tracks the target temperature by cooling water injection is constructed and compared with the power generation improvement rate and the user setting efficiency improvement rate.
태양광발전 효율향상을 위한 목표온도 추적식 냉각수 분사시스템 제어방법
정채봉(Che-Bong Joung),장성택(Seong-Teak Jang),이충식(Chung-Sik Lee),김태진(Tae-Jin Kim),김영근(Young-Geun Kim) 대한건축학회 2017 대한건축학회 학술발표대회 논문집 Vol.37 No.2
As the Photovoltaic system market increases, various technologies are emerging to improve system operation efficiency. Such additional systems of the power generation system are generally referred to as ‘Balance of System’, for example a panel cooling, a panel cleaning and a panel angle adjusting apparatus. In this paper, we discuss an algorithm to calculate the target temperature of cooling in response to changes in the installation environment conditions of the power generation system so that the efficiency improvement rate target set by the user can be achieved with respect to the control method of the cooling water injection system among various panel cooling apparatuses. In order to calculate the target temperature of cooling, the output enhancement coefficient is calculated experimentally based on the temperature change according to the solar radiation condition of the PV panel, and the required reduction temperature of each irradiation condition is calculated considering the efficiency improvement rate. In addition, the efficiency improvement ratio is calculated considering the installation condition of the general power generation system without a separate control group. The thermal performance coefficient of the PV panel test body for calculating the expected temperature of the PV panel is calculated experimentally. The target temperature of cooling is calculated as the sum of the expected temperature of the PV panel and the required reduction temperature, and the injection system that tracks the target temperature by cooling water injection is constructed and compared with the power generation improvement rate and the user setting efficiency improvement rate.