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덕트형 주택환기시스템에서 통합배기 방식의 적용에 대한 실험적 연구
문성민(Moon Sung-Min),김용경(Kim Yong-Kyoung),이정재(Yee Jurng-Jae) 대한건축학회 2008 대한건축학회논문집 Vol.24 No.3
Recently, the instruction of the house ventilation system was necessary because of the recent construction trend and the legal ventilation frequency 0.7 point inside the house of common. It is general in the ventilation system that air supplies and returns to each room. But this system is not efficient when it comes to taking care of economic and construction efficiency. So, we study the instruction of unified ventilation system. The purpose of the system is to compare between original ventilation system and unified ventilation system. The results which it applies to actual apartment site are as followed. In the wind-amount test, unified ventilation system shows more wind amount than that of other existing facilities. Pressure loss shows the opposite results. This displays a more efficient ventilation ability and there is also an application possibility. Finally, we find unified ventilation system contains a brand new possibility and we recognize that more detailed-tests are required to unify ventilation system's practical uses.
A Study on Monitoring Drilling using Torque from Main Spindle Based on PLC in CNC Machine Tools
Sang-hwan Yoon(윤상환),Sung-min Moon(문성민),Sung-ki Lyu(류성기) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.3
Drilling processes require a cutting monitoring function that can be analyzed and gives feedback about strange conditions, tool collision and tool wear in real time. In this study, we proposed a drill monitor using the torque from the main spindle in CNC machine tools and a PROFIBUS network as a PLC-based interface. This paper studied drilling torque changes depending on drill size, the repetition cutting of the drilling and the drill"s wear in the same cutting conditions. The material of the drills was high speed steel (HSS) and uncoated. The drills chosen were 2.7 mm, 6.7 mm, and 10.0 mm in diameter. These drills were selected because they had basic holes for their taps.
Trade-off between Nitrous Oxide and Methane Emissions during Mid-season Drainage in Rice Paddy Soil
Sung Min Moon(문성민),Chang Oh Hong(홍창오) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
Submerged paddy soil is well recognized as a source of methane (CH0<SUB>4</SUB>) emissions. Drainage of paddy soil can make soil environment unfavorable for CH₄ emission but favorable for nitrous oxide (N₂O) emission, which would ‘Trade-off’ the reduction of methane emission. The objectives of this study were 1) examine the trade-off relationship between CH₄ and N₂O emissions during the mid-season drainage period in paddy soil and 2) elucidate mechanism of trade-off between CH₄ and N₂O emission through analysis of functional gene abundance. In a field experiment, rice (Oryza sativa L.) was transplanted and harvested on 5 June and 13 October in 2020, respectively. Mid-season drainage was conducted for two weeks from 10 July to 24 July in 2020. During mid-season drainage, the value of soil Eh dramatically increased, resulting in mitigation of CH₄ emissions. However. N₂O flux peak during mid-season drainage, because water filled pore space (WFPS) ranged from 70% to 80% that is a favorable anaerobic condition for N₂O produced through denitrification process. Gene copy number of nosZ associate with conversion process of N₂O to N₂ significantly decreased during mid-season drainage. In this study, trade-off relationship between N₂O and CH₄ emissions was observed during mid-season drainage. Decrease in CH₄ emission during mid-season drainage was due to aerobic increase in soil Eh. Mitigation of N₂O emission during mid-season drainage was mainly attributed to suppress of conversion process of N₂O to N₂ in denitrification process.
Sung Min Moon(문성민),Chang Oh Hong(홍창오) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
The pattern and total amount of nitrous oxide (N₂O) emission can be affected by characteristics of arable soil and weather condition associated with geographical differences. The objective of this study was to determine the effect of weather conditions and soil properties on N₂O emission from paddy soils in geographically different three regions of South Korea. Field trials were established at three locations (Jeonju, Miryang, and Suwon) in South Korea and the rice (Oryza sativa L.) was transplanted and harvested in May and October 2020 at all locations, respectively. Urea was applied at the rates of 0, 90, 135, and 180 kg N ha<SUP>-1</SUP> at all locations. Mid-season drainage was conducted for 14 days, 5 weeks after transplanting at all locations. Daily N₂O flux and the cumulative N₂O emission, and weather conditions during growing season of rice and soil properties at harvest time were measured. The peak of N₂O flux appeared after drainage during growing season of rice, excepting Jeonju. Compared to the 0 kg N ha<SUP>-1</SUP> treatment group, the cumulative N₂O emissions of 90, 135, and 180 kg N ha<SUP>-1</SUP> treatment groups were 0.23, 0.44, and 0.63 kg ha<SUP>-1</SUP> in Jeonju, 0.16, 0.89, and 1.37 kg ha<SUP>-1</SUP> in Miryang, respectively, were increased by 1.40, 1.52, and 1.04 kg ha<SUP>-1</SUP> in Suwon. The cumulative N₂O emissions increased with application rate of urea, but in the case of Suwon, it did not increase significantly. Although there was no significant difference, Miryang (0.74 kg ha<SUP>-1</SUP>) had the highest mean cumulative N₂O emission, followed by Jeonju (0.42 kg ha<SUP>-1</SUP>) and Suwon (0.16 kg ha<SUP>-1</SUP>). Suwon and Jeonju had 329 and 488 mm more precipitation than Miryang, respectively. The nitrogen content of the study soil was 1.01, 2.24, and 1.16 g kg<SUP>-1</SUP>, respectively. So, precipitation and soil nitrogen content were related to the cumulative N₂O emission. Consequently, cumulative N₂O emissions between the three regions were related to precipitation and soil nitrogen content.
문성민(Sung-Min Moon),강재화(Jae-Hwa Kang),키도히로미쯔(Hiromitsu Kido),구로가와슈헤이(Syuhei Kurokawa),류성기(Sung-Ki Lyu) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.1
Gears are reliable and efficient power transmission elements. They have been widely used in all kinds of machinery. Nowadays, resource conservationㆍenergy conservationㆍenvironmental improvements from the request of the compact, light weight, high efficiency, low costㆍHigher efficiency is required. Tooth root and bottom profiles of cylindrical gears affect bending fatigue life, but they are hard to measure with conventional gear measuring machine(GMM), because GMM is normally customized to measure only gear working flanks. The authors try to develop a new type of GMM by installing an extra 3D scanning probe and control software to measure tooth root and bottom profiles. First, in order to measure in various directions, a 3D scanning probe has been attached to the GMM developed. Next, calibration algorithm has been developed. Deviations of the calibration results are measured and it is found that systematic error must be caused by heat from driving motors. A new alternative GMM with driving motors generating less heat was designed and two GMMs are compared. Finally, 3 Dimension measurement of tooth root and bottom profiles of cylindrical gears is described.