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대용량 CO2 감축을 위한 CCS 연계 SNGCC의 경제성 및 환경성에 대한 연구(NETL 보고서를 중심으로)
서동균,권원순 한국수소및신에너지학회 2015 한국수소 및 신에너지학회논문집 Vol.26 No.5
Recently the Korean government announced its decision to select the 3 rd proposal, which targets reducing CO2 by 37% of the BAU level by 2030, for the Intended Nationally Determined Contribution (INDC). According to this proposal, natural gas (or equivalent gas) combined cycle (NGCC) are suggested as alternatives for conventional pulverized coal (PC). In this study, we analyzed the environmental, economic, and energy mixing aspects of synthetic natural gas combined cycle(SNGCC) using NETL material (2011~2012 version) and other domestic materials (2014 version). We found the following conclusions: 1) Considering carbon capture and storage (CCS) integration, CO2 emission factors of SNGCC and supercritical PC are the same. However, 60% of CO2 from SNGCC is produced as high pressure and high purity (99%) gas, making it highly suitable for CCS, which is now strongly supported by the government. 2) Based on the economic analysis for SNGCC using domestic materials and comparison with NGCC, it was found that the settlement price of SNGCC was 30% lower than that of NGCC.
서동균,이창준,김진선 대한마취통증의학회 2016 Anesthesia and pain medicine Vol.11 No.2
Background: Although oxycodone has been known to be superior to other opioids in postoperative care, few studies have compared its analgesic potency with that of fentanyl. We therefore examined these two drugs in terms of their dose requirements, effects on pain intensity, time needed for relief of pain, and side effects after surgery. Methods: We enrolled 56 healthy women scheduled for total abdominal hysterectomy and randomly allocated them to either oxycodone or fentanyl. The opioids were administered to the two groups 10 minutes before the end of the operation. In the post-anesthesia care unit (PACU) after surgery, a visual analog scale (VAS) was used to assess the patients’ pain every 10 minutes Whenever pain control was required, a bolus of the same dose of the respective drugs was repeated at 10-minute intervals. Patient-controlled analgesia (PCA) was used to manage postoperative pain. After the patient arrived on the ward, pain scores were recorded at once and then 1, 2, 3, and 24 hours thereafter. Results: During the hour spent in the PACU, fewer patients in the oxycodone group required the opioid, and the time needed to achieve pain relief was shorter with oxycodone than with fentanyl. Moreover, postoperative VAS levels were significantly lower in the oxycodone group both in the PACU and on the ward (over a 24– hours period). There were no significant differences in side effects between the patients given oxycodone and those given fentanyl. Conclusions: Oxycodone was more effective than fentanyl when administered on the basis of the recommended dose ratio (1 : 100). Although further evaluation is needed to investigate the optimal dose ratio, we would recommend a higher conversion factor (1 : 62).
식량작물 연구투자의 효율화에 관한 연구 - 공공농업연구기관의 연구자원배분을 중심으로 -
서동균,강창식,박정근 한국농업정책학회 2004 농업경영정책연구 Vol.31 No.4
This study discusses efficiency and priority setting for food crops research resource allocation by the consistence index and scoring method. The consistence index by commodities in food crops is 0.895. As shown in consistency analysis, research resource allocation is relatively efficiently made in food crops production. According to the scoring method, the priority order by total efficiency index is rice, oilseed crop, potato, pulse, barley and cereal crops. Weighted index of farm household is the same order as total efficiency index and notably rice is absolutely higher than any other items. However, research resources are too biased to rice and appropriate allocation of research resources for oil seed and pulse should be promoted.
서동균,부지영,이세연,홍용석 한국퇴적환경준설학회 2023 한국환경준설학회 학술대회논문집 Vol.2023 No.11
Methane is considered the second most important greenhouse gas in the atmosphere and has 21 times high global warming potential(GWP) of CO2. Methane emissions have increased by more than 150% since 1750, with agriculture being the major source for human living. In Korea, approximately 22% of domestic methane(CH4) emissions are emitted from rice cultivation. Study for reducing methane emission from paddy soil is needed. Biochar has the potential to mitigate CH4 emissions from flooded soils that has characteristic of wetlands and irrigated fields cropped to rice(paddy soils). In this study, biochar(BC) is pyrolyzed from diverse temperature and time condition. BC pyrolyzed from 200,300,400,500°C(BC-200, 300, 400, 500) and lasted for 1,3,5 hours are injected to rice paddy and monitored to evaluate which one has best potential for reducing methane. For BC-500 sample, methane generation rate(MGR) is high at week 4 while BC-300,400 sample has highest MGR at week 5. For blank and BC-200 sample has highest MGR at week 6. Further monitoring is needed to evaluate which BC has a high potential for mitigating CH4.
서동균 한국항만경제학회 1996 韓國港灣經濟學會誌 Vol.12 No.-
This paper presents international competitive power of the Korea's trade in service. In 1993, Korea's RCA index that has been used to evaluate international competitive power was 0.76 less than 1 and lower than that of both industrialized and developing countries. Therefore, Our competitiveness in service trade is very weak than goods competitiveness.<br/> Not only do existing data suggest that the poorer developing countries are more likely to be relatively specialized in service, but the ratio of trade relative to output for services tends to be significantly higher than merchandise trade/output ratios in these countries as compared to industrialized (industrializing) nations. In part this is likely to be a reflection of the phenomenon noted above that the share of services in GDP (and the relative price of non-traded services) tends to rise as economic development proceeds.<br/> A general conclusion to emerge is that trade in service should explicitly be taken into account when analysing the structure of trade for a country or groups of countries. This is the case especially for small nations, as these are frequently highly dependent on service. The same holds for least developed countries. These countries are not only relatively specialized in service exports, but such exports are more important in relation to total output and total exports than is the case for richer countries.
서동균,이진향,지준화,홍진표,오석인,SEO, DONG-KYUN,LEE, JIN-HYANG,CHI, JUN-HWA,HONG, JIN-PYO,OH, SUK-IN 한국수소및신에너지학회 2018 한국수소 및 신에너지학회논문집 Vol.29 No.4
In this study a numerical study was conducted to show flow, temperature and gas distributions in a high temperature CO shift reactor which was designed specially for energy saving and then evaluated with the related experiment. Mole fractions of syngas at the end of the catalyst bed were predicted with various assumed pre-exponential factors, were compared with the corresponding experimental results and $10^8$ was finally selected as the value. With the selection, a base case was examined. It was calculated that the inlet duct attached asymmetrically to the CO shift reactor affects on the distribution of the upward momentum (+z directional). In addition, CO conversion ratio is achieved up to 90% in the catalyst bed and especially it reached up to 70% at the initial part of catalyst bed.
발전용 대형 엔진 적용을 위한 천연가스-디젤 혼소에 대한수치 해석적 연구
서동균,허광범,정연태,김의현 한국수소및신에너지학회 2015 한국수소 및 신에너지학회논문집 Vol.26 No.4
Recently KEPCO, KOGAS and other institutions are jointly conducting an R&D for the development and demonstration of the power generation system based on a natural gas/diesel engine on an island. As a preliminary study, co-combustion in the dual fuel engine, which is expected to produce a few mega-watts of electricity, was modeled and calculated using computational fluid dynamics (CFD). The applied key assumptions are 2-dimensional axisymmetric, transient and static volume chemical reaction. Based on the selected blending ratio, which is the key operating condition, natural gas is substituted instead of diesel fuel (basis of high heating value). Results showed that as the blending ratio increases, the reaction rate of the combustion increases and thus maximum temperature is reached more rapidly. For the optimal performance, various geometric or operational studies will further be conducted.