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차량 조종 안정성 향상을 위한 MDPS 제어 알고리즘 개발
고상진(Sang-Jin Ko),오세욱(Se-Wook Oh),구은경(Eun-Kyung Gu),남광수(Kwang-Soo Nam) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In this paper, we suggest new control algorithms of motor driven power steering (MDPS) system to improve steering maneuverability. Conventional MDPS system supports a driver to steer easily through an electric motor. Therefore, it is possible to stabilize vehicle movement by applying additional control algorithms to conventional MDPS system without any other equipment. Proposed control algorithms allow MDPS system to distinguish vehicle state independently without other systems, such as electronic stability control (ESC) system and stabilize vehicle movement through additional torque. Proposed algorithms consist of three algorithms - road surface detection algorithm, handling compensation algorithm and yaw compensation algorithm. First, road surface detection algorithm is to distinguish road surface through estimated alignment torque and to calculate surface index (SI) as a new vehicle state. SI is obtained by difference between of reference alignment torque on high-μroad and on driving road. Handling compensation algorithm and yaw compensation algorithm generate additional torque, which make vehicle movement more stable, using SI. Handling compensation algorithm functions to improve steering maneuver in a nonlinear region where the alignment torque is saturated and prevent over and under steering. yaw compensation algorithm enables to return a steering wheel more rapidly and improve yaw stability. We have implemented this algorithm in ECU of MDPS system and conducted an actual vehicle test to verify performances of proposed control algorithms. Test results were compared with test results of conventional MDPS system and it proves vehicle stability improvement of proposed control algorithms.
블루베리-쌀 천연발효종과 자광미 가루를 첨가한 우리밀 식빵의 품질 특성
최상호(Sang-Ho Choi),고상진(Sang-Jin Ko),이승범(Seong-Byum Lee),김효숙(Hyo-Suk Kim) 동아시아식생활학회 2014 동아시아식생활학회지 Vol.24 No.6
This study investigated quality characteristics of pan breads prepared with 0, 10, 20, 30 and 40% purple rice flour and naturally fermented blueberry-rice starters. RVA (Rapid Visco Analyzer) analysis showed that wheat flour retrogradation was not retarded by addition of purple rice flour. Using amylography, gelatinization tem. perature of purple rice flour samples was higher than that of the control, whereas maximum viscosity temperature. and maximum viscosity of purple rice flour samples were lower than those of the control. Weights of pan breads containing purple rice flour were lower than that of the control, whereas volume, specific volume and baking loss rate were higher than those of the control. The anthocyanin contents and antioxidative activites as measured by DPPH radical scavenging activity of breads increased as the concentration of purple rice flour increased. The moisture content of pan breads containing purple rice flour decreased as storage time increased. The pH of breads containing purple rice flour was higher than that of the control. Color L value decreased, whereas a and b values increased significantly, as storage time increased. In texture analyzer measurement, hardness of breads containing purple rice flour significantly increased as storage time increased. Breads containing 10∼20% purple rice flour showed acceptable sensory properties, such as mouth feel, appearance, flavor, texture, taste and overall acceptability.
경계요소법을 이용한 혼합형 음극방식 적용에 따른 수중 전자기장 감소 연구
김용상 ( Yong-sang Kim ),고상진 ( Sang Jin Ko ),이상규 ( Sangkyu Lee ),김정구 ( Jung-gu Kim ) 대한금속재료학회(구 대한금속학회) 2017 대한금속·재료학회지 Vol.55 No.8
In this paper, the influence of mixed-type (impressed-current and sacrificial-anode) cathodic protection on an underwater electromagnetic field was investigated using the boundary element method. The current applied for cathodic protection was reduced by installing sacrificial anodes in the stern region. Also, the potential difference produced by the propeller in the stern region was decreased, due to the effective potential distribution generated by the sacrificial anode. The underwater electromagnetic signature decreased at 18 ℃ and 5 m/s, but not at 6 ℃. The difference in current density produced by the environment influenced the intensity of the electromagnetic field. The dramatic decrease in applied current at 6 ℃ increased the maximum electromagnetic signature. Thus, while the mixed-type cathodic protection effectively reduced the underwater electromagnetic signature, the design of the mixed-type cathodic protection should be optimized based on the environmental conditions, due to the sacrificial anode effect. (Received March 7, 2017; Accepted May 8, 2017)