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홍영기,김상철,김국환,김성기 제어로봇시스템학회 2014 제어로봇시스템학회 각 지부별 자료집 Vol.2014 No.12
The percentage of those aged 60 and over is 43.5% among our country’s 3,186 thousands farming population, so farm village is getting aging society rapidly. Moreover agricultural competitiveness has being weakened due to labor shortage by degradation in quality of labor configuration from elderly person. For realisms easy workability, we developed a motor vehicle for agricultural activity. The vehicle has an automatic guidance system which could follows a track of magnetic tape on the floor for easy moving to given working position. We collected data from two guidance sensors, located on front and rear end of the vehicle and calculated displacement and angle deviation from the track. This traveling system was stably controlled with processing information deflection S, angle of deviation, D and angle velocity, Vt = k₁D - k₂S from two guidance sensors attached on front and rear of the motor vehicle. Also this system have been tested under various condition of k₁, k₂ for comparison on both stepped and turning routes. The results show that traveling performance is best at k₁=0.7, k₂=3.
투과기화법에 의한 Carboxymethylcellulose 분리막의 물/유기용제 흔합액의 분리특성
홍영기,배기서,이정민,Hong, Yeong-Gi,Bae, Gi-Seo,Lee, Jeong-Min 한국섬유공학회 1993 한국섬유공학회지 Vol.30 No.4
The separation characteristics of the carboxymethylcellulose(CMC) membrane for organic aqueous solution were determined by vacuum pervaporation. The apparatus used in this experiment can forecast the concentration distribution and/or permeating phenomenon of organic solvent in the membrane, unlike the conventional apparatus. The purpose of this study is to investigate the permeation and separation characteristics of the homologous series of organic solvents through selected hydrophilic polymer membranes. CMC membrane is suitable for the separation of water/organic solvent mixtures due to the high separation factor and the large amount of permeation. The separation analysis was carried out with a Hewlett Packard, HP5890 Series Gas Chromatograph. The permeating concentration is generally increased at the beginning stage, but led to equilibrium permeate according to experiment time. It is desirable that the separation characteristics should be evaluated of equilibrium state.
홍영기 청주대학교 보건의료과학연구소 2017 보건의료과학연구 Vol.6 No.1
Discogenic pain is a common cause of work related disability. However, its pathogenesis has not yet been fully elucidated, and therapeutic and diagnostic methods for the disease are still being debated. It is difficult to completely exclude the possibility that subjective variables are involved in the diagnosis process and also difficult to find objective indicators for verification of treatment..The purpose of this paper is to review the latest research on the disease and examine the rationale of the various approaches for discgoenic pain. In many cases, clinical procedures for discogenic pain have been performed without sufficient basic experiments and theoretical discussions. This paper raises questions about the problems associated with such situations.