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이홍원,김재봉 한국로지스틱스학회 2022 로지스틱스연구 Vol.30 No.3
This study analyzed factors affecting the occurrence of occupational injuries to the parcel delivery worker. To analyze labor environment factors affecting the occurrence of occupational injuries to the parcel delivery worker, total working hours per day, parcel sorting hours per day, hours of delivery per day, delivery quantity, number of night shifts, initial delivery hours, driving distance per day, average break hours, and parcel weight & size were used as independent variables. For dependent variables, whether one experienced occupation-related health problems, and occupation-related accidents were used. The most important factors affecting occupation-related health problems were increase in the total work hours per day during the peak season and the severe extension of hours spent for sorting, which affect the total work hours. In addition, increase in the average daily driving distance and parcel weight & size also affected occupation-related health problems. Occupation-related accidents showed somewhat similar results as occupation-related health problems; chronic overwork showed an effect on the experience of occupation-related accidents. Although parcel weight & size affected occupation-related accidents, hours of delivery per day and driving distance per day did not show any effect.
공기주입 장치와 공기제거 장치를 사용한 표면 플라즈몬 공명 타원계측기
이홍원,조은경,조재흥,원종명,신기량,제갈원,조용재,조현모,Lee, Hong-Won,Cho, Eun-Kyoung,Jo, Jae-Heung,Won, Jong-Myoung,Shin, Gi-Ryang,CheGal, Won,Cho, Yong-Jai,Cho, Hyun-Mo 한국광학회 2009 한국광학회지 Vol.20 No.3
완충용액과 분석시료의 확산으로 발생하는 측정 오차를 최소화하기 위하여 공기주입 장치와 공기제거 장치를 설치한 표면 플라즈 몬 공명 타원계측기(surface plasmon resonance ellipsometer: SPRE)를 새로이 제안하고 이를 제작하였다. SPRE에서 완충용액과 분석시료간의 상호 확산은 분석시료의 농도를 변화시켜 굴절률 측정에 영향을 주고, 이 결과 생체분자 물질의 접합 특성이 명확하게 나타나지 않는다. 이러한 SPRE의 측정 장치에 공기를 주입하는 장치를 추가로 설치하여 두 용액의 확산을 막고, 특히 불필요한 공기가 채널 내부로 유입되어 생기는 잡음신호를 없애기 위하여 공기제거 장치를 사용함으로써 신뢰성 있는 SPRE의 측정 결과를 얻을 수 있음을 확인하였다. The surface plasmon resonance ellipsometer (SPRE), using a multiple air injection system with an extraction of air system, has been proposed and developed to minimize measurement error of signals due to diffusion of reagent into running buffer. Since the diffusion of reagent into running buffer affects the refractive index of the running buffer by changing the concentration, characteristics of binding between various bio-molecules don't appear clearly in measurement results. The diffusion between running buffer and reagent can be blocked by using an air bubble injection system. An extraction of air system is used to remove the noise signal due to unnecessary air bubbles flowing in a channel. Reliability of measurement results has been improved by using the valve system.
에어컨의 냉방기간 에너지 효율 산출을 위한 실험적 연구
이홍원,문정호,배영돈,박종철,Lee, H.W.,Moon, J.H.,Bae, Y.D.,Park, J.C. 대한설비공학회 1992 설비공학 논문집 Vol.4 No.3
In most cases, EER(Energy Efficiency Ratio) is available to present energy efficiency of air-conditioners. But, EER is not adapt to measure energy efficiency at actual life environment because it is based on fixed temperature and humidity contditions. To overcome this disadvantage, there is need to introduce SEER(Seasonal Energy Efficiency Ratio) established at time varient temperature and humidity conditions. In this paper, SEER measurement method and conditions based on actual life environment of the country is introduced, and discussed SEER value about two air-conditioner type, that is, non inverter air-conditioner and inverter air-conditioner. As a result of, inverter air-conditioner was superior to non inverter air-conditioner at cooling seasonal energy efficiency.
이홍원,서정원,정재학,조상인,최상성 대한임베디드공학회 2007 대한임베디드공학회논문지 Vol.2 No.1
In this paper, we have propose a preamble structure and synchronization/channel estimation method for UWB-MIMO which has 960Mbps transmit rate. The proposed structure is a compatible preamble structure for synchronization/channel estimation used by MIMO in MB-OFDM(Multi-Band OFDM) systems that are one of the standard systems of MBOA. The system is compatible with MB-OFDM using the proposed preamble structure. In this paper, we argue the problem in receiver part used by MIMO technique. And we simulate the proposed preamble for using synchronization/channel estimation. The simulation result shows the same performance compared with single receiver antenna.