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Izumikawa Yu,Yubai Kazuhiro,Hirai Junji The Korean Institute of Power Electronics 2006 JOURNAL OF POWER ELECTRONICS Vol.6 No.1
In this paper, we propose a fault-tolerant control system for the position control and vibration suppression of a flexible arm robot. The proposed control system has a strain gauge sensor signal observer based on a reaction force observer and detects a fault by monitoring an estimated error. In order to improve the estimation accuracy, the plant parameters included in the sensor signal observer are updated by using the strain gauge sensor signal in normal time through the adaptive law. After fault detection, the proposed control system exchanges the faulty sensor signal for the estimated one and switches to a fault mode controller so as to maintain the stability and the control performance. We confirmed the effectiveness of the proposed control system through several experiments.
Yu Izumikawa,Kazuhiro Yubai,Junji Hirai 전력전자학회 2006 JOURNAL OF POWER ELECTRONICS Vol.6 No.1
In this paper, we propose a fault-tolerant control system for the position control and vibration suppression of a flexible arm robot.<br/> The proposed control system has a strain gauge sensor signal observer based on a reaction force observer and detects a fault by monitoring an estimated error. In order to improve the estimation accuracy, the plant parameters included in the sensor signal observer are updated by using the strain gauge sensor signal in normal time through the adaptive law. After fault detection, the proposed control system exchanges the faulty sensor signal for the estimated one and switches to a fault mode controller so as to maintain the stability and the control performance. We confirmed the effectiveness of the proposed control system through several experiments.
South Korea’s Nordpolitik and the Efficacy of Asymmetric Positive Sanctions
Yasuhiro Izumikawa 한국학술연구원 2006 Korea Observer Vol.37 No.4
This article analyzes why Nordpolitik, South Korea’s pos-itive sanctions aimed to improve relations with the SovietUnion and China, succeeded in the early 1990s despite thehuge capability gap between the sender and target states. Inconducting this research, I consider Nordpolitikas a deviantcase of successful asymmetric positive sanctions, and try to605former East Germany. Although this strategy has not attractedmuch attention from scholars of International Relations Theory, itssuccesses significantly transformed security environments in EastAsia (Cotton, 1993; S. Kim, 2004).This article addresses why South Korea’s Nordpolitikscoredremarkable successes in the early 1990s. There are two reasonswhy such successes are puzzling. First, the success of Nordpolitikruns counter to a prevailing notion among policy makers thatpositive sanctions are ineffective statecraft (Drezner, 1999/2000:190; Dorussen, 2001: 253). What makes the successes of Nordpolitik
Considerations on Improvement of Moving Properties for Magnetic Actuator Capable of Movement in Pipe
Tomohiro Izumikawa,Hiroyuki Yaguchi 한국자기학회 2011 Journal of Magnetics Vol.16 No.3
The present paper proposes a novel cableless magnetic actuator with a new propulsion module that exhibits a very high thrusting force. This actuator contains an electrical inverter that directly transforms DC from button batteries into AC. The electrical DC-AC inverter incorporates a mass-spring system, a reed switch, and a curved permanent magnet that switches under an electromagnetic force. The actuator is moved by the inertial force of the mass-spring system due to mechanical resonance energy. The experimental results show that the actuator is able to move upward at a speed of 33 ㎜/s when using 10 button batteries when pulling a 10 g load mass. This cableless magnetic actuator has several possible applications, including narrow-pipe inspection and maintenance.
A NEW TREATMENT SYSTEM FOR ANIMAL WASTE WATER USING MICROORGANISM, SOIL AND VEGETATION
Oshida, T.,Fukuyasu, T.,Kohzaki, K.,Izumikawa, Y.,Kawanabe, S.,Konishi, S.,Oikawa, N.,Matsumoto, S. Asian Australasian Association of Animal Productio 1993 Animal Bioscience Vol.6 No.2
A new treatment system for animal waste water has been developed as an alternative to the activated sludge process. It consists of two treatments; one is operated with 7 tanks, and the other is soil and plant cultivation bed. Aerobic microorganisms are added to the influent water in the tanks where the water is aerated so that the microbes utilize the pollutants, while sedimentation removes the indigestible solids. In the secondary treatment the water, which has already received a primary treatment, is filtered through soil where it also receives treatment by soil organisms. In addition there is transpiration of water and absorption of minerals by plants. In the primary treatment BOD, SS, coliforms (E. coli), TP and total bacteria were removed 79-99%, but COD and TN were removed only 58% and 36%, respectively. In the secondary treatment removal of nutrients proceeded further, and 93-99% of pollutants were removed. The treated waters met the quality standard of discharge water in Japan except for TN, which was in too great a concentration to meet discharge standards. This problem requires further study.