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김두환,장민환,김상준,KIM DOO HWAN,JANG MIN HWAN,KIM SANG JOON 한국천문학회 1998 天文學論叢 Vol.13 No.1
We have investigated future large telescopes, which should represent the next generation of Korean optical and infrared telescopes. We first studied the history of the development of large telescopes in the USA, European countries, and Japan. Based on these studies, we came up suitable Korean large telescopes, which fit the current status of Korea in terms of financial situation, required technology, sciences, and manpower. We presented the potential impacts of developing large telescopes on the relevant Korean industry and Korean astronomical society. We also discussed a possibility to install large Korean telescopes at foreign sites utilizing highly competitive seeings and twice available observing dates there.
김두환,이인복,최동윤,송준익,전중환,하덕민,Kim, Doo-Hwan,Lee, In-Bok,Choi, Dong-Yoon,Song, Jun-Ik,Jeon, Joong-Hwan,Ha, Duk-Min 한국축산환경학회 2013 한국축산시설환경학회지 Vol.19 No.2
This survey was conducted to investigate the current state of odor emission and control from 48 site of Hanwoo, dairy, swine and poultry farms in Korea. On-site complex odors assessment by the method of 6 step direct sensory evaluation and ammonia concentrations by portable gas detector on the boundary line of farms were evaluated and detected as 1.11 & 2.78 ppm, 1.67 & 2.56 ppm, 1.91 & 2.89 ppm, 1.8 & 2.4 ppm and 1.33 & 2.33 ppm, respectively. Almost of Hanwoo, dairy and poultry farms were nothing the complaints occurred for the last 2 years, however as 60% of swine farms were suffered odor complain. All of livestock operations were used the additives for improving the farm environment and spent the considerable costs for odor reduction. There were several plans almost farms, as a fortify maintenance, keep clean, tree planting, expansion facilities for manure treatment or odor reduction.
김두환,윤성수,박진선,Kim, Doo-Hwan,Yoon, Seong-Soo,Park, Jin-Seon 한국농공학회 2010 한국농공학회논문집 Vol.52 No.2
For the reasonable analysis of design problems for agricultural facilities, considered the reinforcing effect of thin-wall. The most of agricultural structure is constructed small scale and have many purposes. Thus it has been designed temporary rather than permanent structure, and has relatively large slenderness ratio, small section and semi-rigid condition. Therefore many agricultural facilities are consist of relatively strong frame with weak wall at the viewpoint of stiffness and have not been reflected in the design. But the tension field influences to collapse of structure have already known. Therefore, we need quantification the effect of tension field at structural analysis. In this study, present the method of quantification the effect of tension field that came out thin-plate surrounded by high stiffness frame. The numerical results show that the effect of tension field effect for thin-wall is about 5% of the sectional area of frame in study agricultural facilities.
김두환,하덕민,이인복,최동윤,송준익,Kim, Doo-Hwan,Ha, Duck-Min,Lee, In-Bok,Choi, Dong-Yun,Song, Jun-Ik 한국축산환경학회 2014 한국축산시설환경학회지 Vol.20 No.2
This study was conducted to investigate the dispersion prediction of odor from swine farms in Korea. Gaussian Plume model used in considering of farm size, wind velocity, atmospheric stability and threshold odor unit to prediction of odor dispersion based on the survey on current state of odor emission and control from 48 site of swine farms. Farm size, wind velocity and atmospheric stability were affected the distance of odor dispersion, showed longer distance in cases of large farm, low wind velocity and stable atmospheric condition. We will suggestion the adjusted distance of odor dispersion according to farm size was estimated to 180 m in small farm and 320 m in large farm when apply the 3 OU, 5 m/s wind velocity and stable atmospheric condition.
김두환,하덕민,신용환,Kim, Doo-Hwan,Ha, Duk-Min,Shin, Yong-Hwan 한국축산환경학회 2013 한국축산시설환경학회지 Vol.19 No.2
This survey was conducted to investigate the present conditions of operational management in the 45 animal manure public resource center (APRC) in Korea. The regional distribution, processing capacity per year, capacity of liquid fertilizer storage tank, solid-liquid separation, utilization of facilities, odor reduction facility, on-site odor strength, complained in the community, liquid fertilizer sprayed area, use the Agrix, land application recipe, composting degree, quality management and general grading were surveyed and evaluated. General grading was divided with 5 stages (very good, good, fair, lack and bad). The number of evaluated "very good" animal manure public resource center was 7, and "good" was 5 and more than "fair" was 27. However, the number of evaluated negatively including "lack" and "bad" was occupied as 40% of the 45 animal manure public resource center.
김두환,하덕민,이재영,김희호,송준익,Kim, Doo-Hwan,Ha, Duck-Min,Lee, Jae-Young,Kim, Hee-Ho,Song, Jun-Ik 한국축산환경학회 2015 한국축산시설환경학회지 Vol.21 No.1
This study was conducted to investigate the dispersion prediction of odor from Hanwoo and dairy farms. Gaussian Plume model used in considering of farm size, wind velocity, atmospheric stability and threshold odor unit to prediction of odor dispersion based on the survey on current state of odor emission and control from 9 site of Hanwoo and 9 site of dairy farms. Farm size, wind velocity and atmospheric stability were affected the distance of odor dispersion, showed longer distance in cases of large farm, low wind velocity and stable atmospheric condition. We will suggestion the adjusted distance of odor dispersion according to farm size was estimated to 50~100 m in Hanwoo farm and 50~150 m in dairy farm when apply the 3OU, 5 m/s wind velocity and stable atmospheric condition.