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RISS 인기검색어
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- 저자 : ( Kenichi Matsuda ) (검색결과 6 건)
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Bearing Only Localization for Multiple AUV with Acoustic Broadcast Communication
Kenichi Fujita,Takumi Matsuda,Toshihiro Maki 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
This paper presents the method and characteristic of bearing only localization applying for multiple low-cost autonomous underwater vehicles (AUVs). In the proposed method, each AUV equips sensors which are not always accurate enough to estimate position. The method estimates the positions of the AUVs combining the information of the directions from the AUVs to the acoustic source and sensor values on the AUVs. This paper analyzed the capability of this method using the mathematical model of the system with observability rank condition. The result indicates the system has observability as far as the AUV does not move directly from or to the acoustic source. The position of the AUVs was also estimated using the particle filter. The method succeeded in the particles from diverging. We also observed that the accuracy of the estimation depends on the relative position of the acoustic source from the AUV.
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Analysis of High Frequency Voltage-Resonat Push-Pull Converter
Kenichi Onda,Takao Yaginuma,Yasuo Matsuda,Akiteru Ueda,Hitachi Ltd 전력전자학회 1989 ICPE(ISPE)논문집 Vol.- No.-
In a conventional analysis of a voltage-reso-nant push-pul] converter, resonant frequency and out-put voltage are obtained as constant, even if the out-put current of the converter changes. However, experi-mentally these values are known to vary with the out-put current. No qualitative or quantitative interpre-tation has been made on this point yet. This paper describes a new analysis of the converter, considering leakage inductance of a transformer. The variation is found to be caused by parasitic resonance which occurs between the leakage inductance of the transformer and the capacitance of the resonant capacitor. The new method allows the characteristics of the converter to be analyzed quantitatively. Then the varlation of the resonant frequency and the output voltage can be decreased through an increase of the coupling coefficient of the transformer or the resonant current of the converter. Furthermore, the generalized characteristics of the voltage-resonant push-pull converter can be derived from this analysis.
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UV-FF/OZONE 방법에 의한 침출수 중 다이옥신류의 분해 제거
( Yumi Matsuda ),( Kenichi Shishida ),( Hiroto Hamki ),( Masaharu Sakagami ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.2
매립지에서 발생하는 침출수는 다양한 미세 오염물질이 포함되어 있기 때문에 위험성을 가지고 있다. 특히 다이옥신류는 극소량으로도 독성이 심각하다. 다이옥신류는 물에대한 용해도가 낮기 때문에, 대부분 고체에 흡착되어 있다. 그러므로, 다이옥신류는 화학적, 생물학적 처리에 의한 침출수 처리시 슬러지에 농축되기도 한다. 슬러지내에 농축된 다이옥신류는 매집지에서 재용출될 수 있으며, 침출수 처리 공정에서 슬러지내의 다이옥신 감소는 중요한 문제를 유발할 수 있다. 침출수 전처리시 다이옥신류의 감소는 슬러지 내의 다이옥신 및 처리수 내의 다이옥신의 감소를 의미할 수 있다. 그러한 공정 중 하나로써, 오존과 UV 를 이용한 고도산화 공법(AOPs) 일종인 오존 장착 UV-Falling Film Reactor를 실험하였으며, 그 결과 침출수 원수 처리시 다이옥신류의 분해율이 80% 이상으로 나타났다. The leachate from landfill sites has the risk because of various micropollutants are contained. Especially DXNs are serious because of toxicity which exists even small quantities by biological concentration. DXNs have the low solubility to water, so large part of DXNs adsorbed on solids. Therefore, DXNs are often concentrated in sludge of the chemical clarification and the biological treatment on the leachate treatment. Concentrated DXNs in sludge might be returned to the dumpsites, and then in the leachate treatment processes, decreasing the dioxins in sludge can be an important problem. When DXNs are decreased on the pretreatment of raw leachate, it is possible to decrease them both in sludge and in treated water. As one of such processing, we evaluated the “Ultra Violet-Falling Film Reactor” with ozone system, which is one of the Advanced Oxidation Processes (AOPs) using ozone/UV. The DXNs decomposition rate of 80% or more was obtained, on the treatment of raw leachate.
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DISSOLUTION REMOVAL OF DXNS IN THE LEACHATE BY UV-FF/OZONE METHOD
( Yumi Matsuda ),( Kenichi Shishida ),( Hiroto Haruki ),( Masaharu Sakagami ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.1
The leachate from landfill sites has the risk because of various micropollutants are contained. Especially DXNs are serious because of toxicity which exists even small quantities by biological concentration. DXNs have the low solubility to water, so large part of DXNs adsorbed on solids. Therefore, DXNs are often concentrated in sludge of the chemical clarification and the biological treatment on the leachate treatment. Concentrated DXNs in sludge might be returned to the dumpsites, and then in the leachate treatment processes, decreasing the dioxins in sludge can be an important problem. When DXNs are decreased on the pretreatment of raw leachate, it is possible to decrease them both in sludge and in treated water. As one of such processing, we evaluated the “Ultra Violet-Falling Film Reactor” with ozone system, which is one of the Advanced Oxidation Processes (AOPs) using ozone/UV. The DXNs decomposition rate of 80% or more was obtained, on the treatment of raw leachate.
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Sueyoshi, Mitsuhiro,Furue, Toshihiko,Sato, Akihiro,Yokoyama, Kenichi,Yamadera, Yoshimi,Fujiwara, Kiyoshi,Matsuda, Katsuhiko 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.5
Aluminum brass tubing which is highly cost-effective and has a high heat transfer property has been widely used for seawater cooled condenser in Japan. However, the tubing suffers from erosion and corrosion on the inner surface in spite of ferric-ion injection and cathodic protection. Ammonia also attacks the outer surface after long years of service. Periodic replacement with new tubing has been performed. Titanium tubing which has high corrosion resistance, has been used in new condensers and for the air removal zone of the condenser. However, its service has been restricted due to higher cost and lower elastic modulus. As a countermeasure, we have developed a high performance ferritic stainless steel tubing called "Super Stainless: FS1O" which has excellent corrosion resistance and is highly cost-effective. First, the tubings were used experimentally in our Buzen thermal power station, Unit 2 condenser in 1993, and various investigations have been performed on the extracted tubing and tube sheet every year. Ammonia attack on the outer surface, corrosion and erosion on the inner surface, crevice corrosion between the tube and the tube-sheet. Hz absorption and degradation of properties was not observed. Based on these results, 1,006 pieces of FS1O were installed in Buzen thermal power station, Unit I condenser in 1996. The tubing has been used in seawater without any corrosion problems.
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