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BIM기반 MEP공사 시공용 도면 작성 자동화 프로세스 제안
최창현,권대용,조상호,김주형,Choi, Chang-Hyun,Kwon, Dae-Yong,Cho, Sang-Ho,Kim, Ju-Hyung 한국BIM학회 2020 KIBIM Magazine Vol.10 No.4
Shop drawing tasks conducted after finishing coordinated or engineering design have great influences on the quality and cost of a project. However, despite the development of commercial BIM applications, shop drawings have mainly produced manually in certain engineering fields. Incorrect shop drawings with human errors have occurred various problems such as cost overrun, time delay and reworks. An automated shop drawing publishing from BIM is expected to resolve these problems. Despite attempts for automate shop drawing production, the field of mechanical, electrical and plumbing (MEP) is yet regarded challenging due to complexity of components and connection. In this research, we develop a process for automated producing 3D MEP shop drawings in BIM environment as following steps: to analyze conventional MEP shop drawing process, to identify detailed process that can be automated, to classify existing MEP objects and assign codes usable in BIM, and to develop an application. The validation of automated process is conducted against 10 clean room projects in which MEP is more complex and its cost is higher than other projects in terms of productivity and workers' satisfaction. Results show that the number of manpower for shop drawing is reduced by 30%, and the working time is shortened by 31%. Personal opinions of involved practitioners is interpreted as positive as the average rate of agrement on practicability, easy-to-use and necessary retouch tasks is around 66%.
최창현(Chang Hyun Choi),한강완(Kang Wan Han),조재영(Jae Young Cho),전재철(Jae Chul Chun),김성조(Seong Jo Kim) 한국환경농학회 2000 한국환경농학회지 Vol.19 No.1
This study was carried out to investigate the changes of water quality, the pollutant loading by population, livestock, and land use at the Namdae-cheon in Keum river districts. Water samples were taken at the four sites of watershed, the nutrients of which were analyzed periodically from July, 1995 to April, 1998. Content of nutrients in water samples ranged from 1.8 to 5.8 ㎎/L for total nitrogen, from 0.01 to 0.08 ㎎/L for total phosphorus and from 0 to 0.007 ㎎/L for ortho-phosphate respectively. Nitrogen loading by pollutant unit was investigated 550.4 ton/yr as 358.1 ton/yr by livestock, 129.3 ton/yr by land use and 63.0 ton/yr by population. Phosphorus loading by pollutant unit was investigated 79.1 ton/yr as 60.6 ton/yr by livestock, 5.2 ton/yr by land use and 13.3 ton/yr by population. The loading of measured pollutant was investigated 452.5 ton/yr of nitrogen and 5.4 ton/yr of phosphorus in Namdae-cheon watershed.
빵용 밀 품종의 등숙기 질소 시비 시기와 양이 글루텐 분획 및 빵 부피에 미치는 영향
조성우,강택규,박철수,손재한,최창현,정영근,윤영미,김경호,강천식,Cho, Seong-Woo,Kang, Taek-Gyu,Park, Chul Soo,Son, Jae-Han,Choi, Chang-Hyun,Cheong, Young-Keun,Yoon, Young-Mi,Kim, Kyong-Ho,Kang, Chon-Sik 한국작물학회 2018 한국작물학회지 Vol.63 No.3
The purpose of this study was to evaluate the effects of nitrogen fertilization amount and timing of application on protein content, dough properties, change in protein fraction, and bread loaf volume for Korean wheat cultivars, Baekkang, Joongmo2008, and Saekeumkang, for bread with a superior gluten composition during the grain filling stage. Protein content increased with an increase in the amount of N and timing of application. The SDS segmentation volume (SDSS) increased with an increase in N, but there was no effect of the timing of N application on SDSS. An increase in N amount and timing of application caused a difference in dough properties, such as water absorption, mixing time, and tolerance, among the cultivars. Soluble and insoluble polymeric and monomeric protein contents increased with an increase in N amount and timing of application the three Korean wheat cultivars. The effects of N amount and application timing on bread loaf volume (BLV) varied among the cultivars. The BLV of Saekeumkang increased regardless of the N amount and timing of application, but that of Baekkang and Joongmo2008 cultivars was reduced. However, there was a positive correlation between protein content with the addition of N fertilization and BLV. In addition, SDSS, mixing time, and protein fractions were positively correlated with BLV. Since the response of fertilizer conditions was different for each wheat cultivar, it is necessary to build a suitable fertilizing system for each of them. Additionally, since the environment is changing, such as abnormal climate during the maturing period, research is needed to establish appropriate fertilizer conditions for varieties of bread wheat.
조재영(Jae Young Cho),한강완(Kang Wan Han),최창현(Chang Hyun Choi) 한국환경농학회 1999 한국환경농학회지 Vol.18 No.2
Since the national land area is small and the fanning land occupies only 24% of total land area in Korea, the promotion of agricultural productivity is urgent. In this process, the application rate of chemical fertilizer, which is the major pollution factor at agricultural non-point sources, has been increasing in every year. The present study examined difference of runoff loading of nitrogen and phosphorus by rainfall intensity(above 100㎜, 80-100㎜, 50-80㎜ and 30-50㎜). Runoff loading of nitrogen and phosphorus by rainfall intensity has differences under similar rainfall intensity. We are considering that these results were affected by rainfall intensity as well as hydrological condition, soil management, whether or not fertilizer application, cropping, rice straw and plowing
양수장 지구 광역논으로부터 영농기간 영양물질의 유출 및 물질수지
윤광식(Kwang Sik Yoon),한국헌(Kuk Heon Han),조재영(Jae Young Cho),최창현(Chang Hyun Choi),손재권(Jae Gwon Son),최진규(Jin Kyu Choi) 한국농촌계획학회 2002 농촌계획 Vol.8 No.1
The study was carried out to investigate the water balance and losses of nutrients from paddy fields during cropping period. The size of paddy fields was 95 ha and the fields were irrigated from a pumping station. The runoff loading was the highest in June because of the high concentrations of nutrients due to applied fertilizer. When the runoff losses of nutrients were compared to applied chemical fertilizer, it was found that 39.1 % to 42.5 % of nitrogen lost via runoff while runoff losses of phosphorus account for 14.5 % to 17 % of the total applied amount during cropping period. When the ratio was calculated between nutrients losses by infiltration and the applied of chemical fertilizer, two year results showed 9.1 % to 10.8 % for nitrogen and 0.5% for phosphorus, respectively.
이남규(Nam Gyu Lee),김용주(Yong Joo Kim),백승민(Seung Min Baek),문석표(Seok Pyo Moon),박성운(Seong Un Park),최영수(Young Soo Choi),최창현(Chang Hyun Cho) 유공압건설기계학회 2020 드라이브·컨트롤 Vol.17 No.4
Traction performance of a tractor varies depending on soil conditions. Sinkage and slip of the driving wheel for tractor frequently occur in a reclaimed land. The objective of this study was to develop a tractor suitable for a reclaimed land. Traction performance was evaluated according to soil conditions of reclaimed land and paddy field. Field experiments were conducted at two test sites (Fields A: paddy field; and Field B: reclaimed land). The tractor load measurement system was composed of an axle rotation speed sensor, a torque meter, a six-component load cell, GPS, and a DAQ (Data Acquisition System). Soil properties including soil texture, water content, cone index, and electrical conductivity (EC) were measured. Referring to previous researches, the tractor traveling speed was set to B3 (7.05 km/h), which was frequently used in ridge plow tillage. Soil moisture contents were 33.2% and 48.6% in fields A and B, respectively. Cone index was 2.1 times higher in field A than in field B. When working in the reclaimed land, slip ratios were about 10.5% and 33.1% for fields A and B, respectively. The engine load was used almost 100% of all tractors under the two field conditions. Traction powers were 31.9 kW and 24.2 kW for fields A and B, respectively. Tractive efficiencies were 83.3% and 54.4% for fields A and B, respectively. As soil moisture increased by 16.4%, the tractive efficiency was lowered by about 28.9%. Traction performance of tractor was significantly different according to soil conditions of fields A and B. Therefore, it is necessary to improve the traction performance of tractor for smooth operations in all soil conditions including a reclaimed land by reflecting data of this study.