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IT사례-RFID 시스템 도입 시 상대적 증가비용을 줄이는 것이 중요
유영석,Yu, Yeong-Seok 한국컴퓨터사용자협회 2006 The USERS Vol.47 No.-
RFID 인프라를 셋업하고 상품에 RFID 태그를 부착하는데 소요되는 비용이 천문학적인 숫자임에는 틀림없다. 따라서 상대적 증가 비용을 줄이는 것이 중요하다. 이에 따라 인삼제품을 선정했다. 100만원짜리 인삼(홍삼)에 RFID태그를 붙이는 것은 새우깡 봉지에 붙이는 것에 비해 확실히 체감비용이 다르기 때문이다.
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SWAT 모형을 이용한 최적관리기법 적용에 따른 충주댐 유역의 하천수질 개선연구
유영석,박종윤,신형진,김샛별,김성준,Yu, Yung-Seok,Park, Jong-Yoon,Shin, Hyung-Jin,Kim, Saet-Byul,Kim, Seong-Joon 한국농공학회 2012 한국농공학회논문집 Vol.54 No.1
This study is to assess the reduction of nonpoint source pollution by applying Best Management Practice (BMP) in Chungju-dam watershed (6,585.1 $km^2$) using Soil and Water Assessment Tool (SWAT). The model was calibrated using 3 years (1998-2000) daily streamflow at 3 locations and monthly water quality of sediment (SS), total nitrogen (T-N) and total phosphorus (T-P) data at 2 locations and validated for another 3 years (2001-2003) data. The 5 BMPs of streambank stabilization, porous gully plugs, recharge structures, terrace, and contour farming were applied to stream and area with the specific criteria of previous researches. Through the parameter sensitivity analysis, the farming practice P-factor and Manning's roughness of stream were sensitive. Overall, the NPS reduction effect was high for streambank stabilization, terrace, and contour farming. At the watershed outlet, the SS, T-P, and T-N were reduced by 64.4 %, 62.8 % and 17.6 % respectively.
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유영석 대한상하수도학회 2013 상하수도학회지 Vol.27 No.6
In this study, the carbonized aggregate of light weight and high mechanical strength using sewage sludge was evaluated with changing carbonation variables of temperature, detention time and feed condition. Porosity and mechanical strength was simultaneously increased according to increase of carbonization temperature unexpectedly. Carbonization detention time above 1 hour nearly affect on the porosity, but mainly on mechanical strength of the carbonized aggregate in case of clay addition. On 900 ℃, porosity and mechanical strength was increased rapidly, but above 1000 ℃, porosity began to decrease. Clay addition was very effective on increase of mechanical strength following much loss in porosity. The carbonized aggregate manufactured at 900 ℃ adding 30 % clay in sewage sludge was higher a little in porosity and 3 times in mechanical strength than those at 700 ℃ not adding clay. Consequently, in manufacturing the carbonized aggregate having simultaneously high porosity and mechanical strength, it is desirable to have operational condition of 900 ~ 1000 ℃ temperature and 1 hour time, and clay addition within 30 % for further higher mechanical strength.
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