• Proceedings of the Korea Water Resources Association Conference
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• 2021.06a
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• pp.365-365
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• 2021

기후변화로 인하여 발생하는 자연재해는 수많은 인명 및 재산 피해를 일으키며, 그 중에서도 가뭄은 물과 식량의 안보를 위협하고 있다. 이에 OECD(2015)는 미래의 세계 인구 40%가 2050년까지 물이 부족한 강 유역에서 살 것이라 예측하고 있으며, 물의 다층적 거버넌스를 개발하여 물을 효과적으로 사용하기 위한 상향식 의사결정, 통합물관리 체제의 개념을 제시하기도 하였다. 우리나라 역시 가뭄으로 인한 피해발생이 빈번하고, 그 강도나 범위가 점차 증가하는 추세이다. 하지만 2000년부터 한국농어촌공사(출범은 '농업기반공사')가 농업용수를 관리해오고 있으며, 농업용 수리시설의 증축, 관리 등이 공적인 관리쳬계로 변화해오면서 자연스럽게 농업인의 물관리는 배제되었다. 또한, 농업용수는 무상·무제한 공공재라는 인식과 농업인 평균 연령이 높아짐에 따라 농업인의 물꼬관리 및 수로 훼손, 무단취수 행위 등에 대한 제제가 불가능한 실정이다. 본 연구에서 최근 농식품부의 「2019년 정부가뭄종합대책」에 포함되어 있는 물절약 거버넌스 구축 및 운영 내용을 바탕으로 농업용수 관리 및 사용구조를 고려하여 두 개 지역의 농어촌공사(여주이천지사, 경주지사) 주도 하에 거버넌스를 간담회 형식으로 운영하였다. 농업용수 물절약 거번넌스 이해관계자들은 각 지역별 공기업, 공무원, 농업인, 언론인, 학계 전문가 등이 참가하였으며, 거버넌스 운영 2회 및 설문조사를 실시하였다. 그 결과 각 이해관계자들은 농업용수 절약을 위한 현재 문제점 및 해결방안 등에 대한 의견을 제시하였으며, 설문조사를 통하여 농어촌공사의 신뢰도 및 중요도가 가장 높고, 높은 중요도에 비하여 농업인 및 지자체 등은 신뢰도가 낮은 것을 확인 할 수 있었다. 이러한 결과는 농업인이 농업용수에 대한 주인의식을 가지고, 적극적이고 자발적인 참여가 필요하다는 것을 보여주고 있으며, 본 연구를 통하여 이루어진 간담회 형식의 거버넌스보다 운영효과 및 지속성을 유지할 수 있는 형태의 거버넌스가 연구되어야한다. 향후 농촌형물 거버넌스 모형이 개발되기 위하여 본 연구는 기초자료로 활용할 수 있다.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.73-73
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• 2022

전 세계적으로 발생하고 있는 기후변화로 인하여 자연재해가 빈번한 실정이며, 특히 가뭄은 농업용수 부족과 직결되어 식량안보를 위협하는 요소가 되고 있다. 최근 우리나라에서도 통합물관리 정책 추진과 더불어 농업용수의 물절약 필요성이 강조되고 있으며, 농업용수 수요관리를 위한 실사용자인 농업인과 이해관계자들의 관심과 노력이 필요한 상황이다. 따라서 농업용수의 지속가능성 확보를 위한 물이용 절감 등 적극적인 수요관리를 위해 농업용수 거버넌스 구축이 요구되고 있다. 이에 본 연구에서는 우리나라 농업 현장에 적용 가능한 농업용수 거버넌스 구축에 필요한 주요 구성 인자를 파악해 보았다. 이를 위해 국내외의 농업 및 농촌 거버넌스 사례와 문헌조사 등을 통해 농업용수 거버넌스 구축을 위한 6개의 주요 인자를 선정한 후, 전문가를 대상으로AHP(Analytic Hierarchy Process) 방법을 이용한 설문조사 및 쌍대비교를 통해 우선순위를 도출해 보았다. 그 결과, 총 6개 주요 인자의 중요도는 '핵심주체', '법률 및 정책 구축', '예산 지원', '정보공유 및 커뮤니케이션', '상호 학습', '외부전문가' 순으로 도출되었다. 여기서 가장 높은 중요도를 차지한 '핵심주체'는 농업인을 의미하며, 이는 공사에서 담당하고 있는 현재의 공적관리체계로는 필지단위의 효율적 물관리에 한계가 있으므로, 물 사용의 주체인 농업인의 물관리 참여를 위한 거버넌스 운영에 농업인이 핵심주체로서의 역할을 하는 것이 필요하다는 것을 나타낸다. 농업인 중심의 상향식 거버넌스(Bottom-up governance) 방식으로 농업용수 거버넌스가 운영된다면, 농업용수 이해관계자들의 관심과 농업인의 자발적인 물절약 참여를 유도할 수 있을 것으로 판단된다. 또한 거버넌스 운영을 통하여 농업인 및 이해관계자의 소통과 문제 제기 및 환류 노력 등을 통해 물절약을 위한 제도개선 및 현장 실천 노력 등이 지속적으로 이루어진다면, 농업용수 지속가능성 확보에 긍정적인 효과를 나타낼 수 있을 것으로 사료된다.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.8 no.4
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• pp.311-318
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• 2010

U. S. NRC Regulation Guide 1.52 regulating ESF ACS in nuclear power plants has been revised to revision 3. To apply reduction of operability test time, allowance of alternative challenge agents for in-place leak test of HEPA filters, and upgrade of Methyl Iodide penetration acceptance criterion in activated carbon performance test suggested in Reg. Guide 1.52(Rev.3) on Yonggwang units 5 and 6 ESF ACSes, technical feasibility study was carried out with on-site experiments as well as experiments with a lab-scale model. It was confirmed that the moisture in the system returned to the level before the test in 1 or 4 days even though the moisture was removed during the operability test lasting more than 10 hours. Therefore, it is appropriate to perform monthly operability test in 15 minutes just long enough to check the operability of equipment. To change challenge material for in-place HEPA filter leak test, size of aerosol, production rate, and leak detection capability were compared for DOP and PAO. It was concluded that PAO can be substituted for DOP in nuclear power plants. The upgrade of Methyl Iodide penetration acceptance criterion from 0.175 % to 0.5 % in active carbon filter bed deeper than 4 inches was to conform to the change of activated carbon performance test method to ASTM D3803(1989). It was confirmed that Methyl Iodide penetration acceptance criterion of 0.5 % under $30^{\circ}C$, relative humidity 95 % condition was conservatively good enough for testing performance of active carbon insitu. The licence change of Yonggwang units 5 and 6 has been completed based on this study.

• Economic and Environmental Geology
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• v.37 no.4
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• pp.401-411
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• 2004

The Earth's total magnetic field was calculated from on board TAM(Three-Axis Magnetometer) observations of KOMPSAT-1 satellite between June 19th and 21st, 2000. The TAM's telemetry data were transformed from ECI(Earth-Centered Inertial Frame) to ECEF(Earth-Centered Earth-Fixed Frame) and then to spherical coordination. Self-induced field from the satellite bus were removed by the symmetric nature of the magnetic field. The 2-D wavenumber correlation filtering and quadrant-swapping method were applied to eliminate the dynamic components and track-line noise. To test the validity of the TAM's geomagnetic field, ${\phi}$rsted satellite's magnetic model and IGRF2000 model were used for statistical comparison. The correlation coefficients between KOMPSAT-1/${\phi}$rsted and KOMPSAT-1/IGRF2000 models are 0.97 and 0.96, respectively. The global spherical harmonic coeffi-cient was then calculated from the KOMPSAT-1 data degree and order of up to 19 and compared with those from IGRF2000, $\phi$rsted, and CHAMP models. The KOMPSAT-1 model was found to be stable to degree & order of up to 5 and it can give new information for the low frequency components of the global geomagtic field.

• Journal of the Korean Institute of Gas
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• v.10 no.3 s.32
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• pp.54-59
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• 2006

A safety device with shut-off function was developed for preventing intentional accidents that might happen by separating of cutting hoses connected to pressure regulators used in residential LP gas facility. For the verification of function and field adaptability, the safety device with shut-off function was tested in the state of joining the device to the regulator and a field test was carried out at home. This study shows that, at the inlet pressure of 0.07-1.56 MPa, the device shuts off the gas within the 5m length of hose regardless of the installation condition of the regulator. The shut-off flow rate increases in the order of perpendicular upward, horizontal and perpendicular downward. From the results of the field tests carried out at home for 5 months, there appears no problem using a gas range or a boiler. If the developed shut-off device is commercialized and distributed in the market the intentional accidents occurred by cutting or separating hoses can be prevented remarkably.

• Journal of Korean Society of Environmental Engineers
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• v.34 no.2
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• pp.103-108
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• 2012

A MILD (Moderate and Intense Low oxygen Dilution) combustor decreases NOx formation effectively during the combustion process and NOx formation is affected significantly by the exhaust gas entrainment rate toward fuel and air. The present study focused on the new MILD combustor, which has coaxial cylindrical tube. The outside tube of the new MILD combustor corresponds to the exhaust gas passage and the inner side tube is the furnace passage. The connection pipe is set between the outer side and the inner side tubes and coaxial air nozzle is inserted at the center of the connection pipe. A numerical analysis is accomplished to elucidate the characteristics of exhaust gas entrainment toward the inner furnace with the changes of air nozzle exit velocity, nozzle diameter, nozzle exit position and exhaust gas side pressure. The entrainment rate is proportional to the square root of air nozzle exit velocity and negatively proportional to the pressure difference between the exhaust gas side and furnace side pressures. The effect of air nozzle exit position is not considerable on the exhaust gas entrainment.

• Resources Recycling
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• v.22 no.2
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• pp.62-70
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• 2013

Electric arc furnace slag is made in ironworks during steel refining, it is been increasing chemical and physical resistibility using ageing method of unstable state of melting steel slag for using concrete's fine aggregates. Which is been changing stable molecular structure of aggregates, it restrains moving of ion and molecule. In Korea, KS F 4571 has been prepared for using the electric arc furnace slag to concrete aggregates. In this study, Electric arc furnace slag is used in the PMC(Polymer Modified Concrete) which is applied a bridge pavement of rehabilitation, largely. In that case, this study evaluates the structural safety about increasing the specific weight. The 4-type bridges(RC slab bridge, RC rigid-frame bridge, PSC Beam bridge, Steel box girder bridge) pavement's increasing the total dead load is in 1 ~ 2%. Design moments in a load combination are increased less then 2%. safety factor is decreased less than 3%. Therefore, the structural safety has no problem for applying the electric arc furnace slag within PMC in bridge.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.24 no.2
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• pp.47-53
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• 2014

Three kinds of crystalline silicon have been used for the solar cell grade. First of all, single crystalline silicon is the main subject to enhance the production yield. Most of the efforts are focused on the control of the melt-crystal interface shape affected by the crystal-crucible rotation rate. The main subject in the multi-crystalline silicon ingot is the contamination control. Faster Ar gas flow above the melt surface will lower the carbon contamination in the crystal. And also, twin boundary electrically inactive is found to be more effective than grain boundary for the improvement of the MCLT. In the case of mono-like silicon material, propagation of the multi-crystalline silicon growing from the inner side crucible is the problem lowering the portion of the single crystalline part at the center of the ingot. Crystal growing apparatus giving higher cooling rate at the bottom and lower cooling rate at the side crucible was suggested as the optimum solution obtaining higher quality of the mono-like silicon ingot. Proper application of the seeds at the bottom of the crucible would be one of the solutions.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.20 no.1
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• pp.81-92
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• 2008

In this study, the analysis results were presented for the experimental data of sluice for tidal power generation that were installed in an open channel flume. The experiment was carried out for the six different sluice models of different widths and bottom heights of the sluice throat section. If the side shape of the sluice was the same, the coefficient of discharge generally increased by increasing the width of the throat section. However, when the water discharge was small and the upstream water level was low, the coefficient of discharge increased for a while but decreased later with the increase of the throat section width. In addition, the coefficient of discharge was larger when the bottom height of the throat section was higher, regardless of the width of the throat section. It was concluded that the values of coefficient of discharge that were frequently used in the previous feasibility studies were underestimated so that should be adjusted to higher values.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.2
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• pp.605-621
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• 2019

The purpose of this study was to develop and validate the Korean version of the Classism Attitude Scale for college students (K-CAS) that measures stereotypes and prejudices about socioeconomic class(SES). In study 1, preliminary items were developed through reviewing classism related theories and literatures, analyzing qualitative data by using Consensus Qualitative Method-modified(CQR-M) and getting experts' consultation. With 440 college students data, exploratory factor analysis and reliability analysis were conducted with 14 items in study 1. In study 2, a confirmatory factor analysis and validity analysis were conducted with 400 college students. As a result, two factor structures, upper classism attitude and downward classism attitude, were confirmed. With the higher level of test-retest reliability, the criterion validity was confirmed by the significant correlations among age, subjective SES, the general belief in a just world, negative affects (depression and anxiety), hostility, and K-CAS. The incremental validity was also confirmed that K-CAS scores significantly accounted for 5% of total variation in scores of negative affects(depression and anxiety) in addition to the variables, such as age, subjective SES, house income, and the general belief in the just world. The result of this study is significant in that the developed and validated K-CAS in this study can be a useful tool for further research and prevention and intervention program development related to classism.