Yujiro Harada ¹, Kuniaki Fujimoto ¹, Kei Eguchi ², Masaaki Fukuhara ³, Masahiro Yoshida ³

Affiliations
1 Graduate School of Science and Technology, Tokai University, Kumamoto, JP
2 Department of Information Electronics, Fukuoka Institute of Technology, Fukuoka, JP
3 Department of Embedded Engineering, Tokai University, Tokyo, JP

Abstract

Recently, pattern recognition technologies such as character recognition and finger print recognition are used in various fields. Accordingly, the retrieval technology is becoming important to retrieve the most similar data from a huge database. However, the real-time search is difficult for a software approach, because a digital computer must compare the called data sequentially. To solve this problem, an associative memory has been studied in order to retrieve the reference data which is the most similar to an input data. The associative memory is one of functional memories which is capable of high-speed retrieving for the most similar data by operating parallel. Human brain can retrieve the most similar data to the input data instantly, because it processes information parallel. Accordingly we have focused a neuron CMOS inverter which has characteristics of the brain neuron. In the associative memory, the Hamming distance search circuit is one of the most important circuit to achieve real-time search. In this paper, we propose a wide range Hamming distance search circuit by utilizing neuron CMOS inverters. Unlike conventional circuits, the proposed circuit can retrieve all reference data within a specified Hamming distance.

Keywords

Associative Memory, Hamming Distance, Neuron CMOS Inverter, Time domain.

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Kanji Abe ¹, Ryo Ogata ¹, Kei Eguchi ¹, Krit Smerpitak ², Sawai Pongswatd ²

Affiliations
1 Department of Information Electronics, Fukuoka Institute of Technology, JP
2 Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, TH

Abstract

In this paper, a novel non-thermal food processing system utilizing an underwater shockwave is proposed to process food at high speed. In the non-thermal food processing, target foods are crushed by an underwater shockwave generated by a high voltage. Unlike conventional non-thermal food processing systems, the proposed system has a high voltage multiplier which can generate the underwater shockwave at high speed. Therefore, the proposed system can achieve a high production capacity. The validity of the proposed high voltage multiplier is confirmed by the Simulation Program with Integrated Circuit Emphasis (SPICE) simulation. Furthermore, the feasibility of the proposed system is verified by demonstrating the proposed system by the experiments. In the experiments, an apple is softened by discharging 3.5kV stepped-up voltage.

Keywords

High Speed Operations, High Voltage Multipliers, Non-Thermal Food Processing, Step-Up Voltage Multipliers, Underwater Shockwaves.

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Kei Eguchi ¹, Wanglok Do ¹, Kanji Abe ¹, Krit Smerpitak ², Sawai Pongswatd ²

Affiliations
1 Department of Information Electronics, Fukuoka Institute of Technology, JP
2 Faculty of Engineering, King Mongkut’s Institute of Technology, Ladkrabang, TH

Abstract

Switched capacitor (SC) techniques is used in order to design a simple inductor-less ac-ac converter with small size and high input power factor. Comparing conventional inductor-less ac-ac converters with the proposed converter, an input/ output (I/O) terminal is connected alternately to one of capacitors to achieve ac-ac conversion. To realize the new topology, the new designed converter is composed of two capacitors and four switches in the conversion ratios of 2 and 1/2. For this reason, as well as high input power factor, the proposed converter can achieve small size. To explain how the proposed converter is operated with the conversion ratios of 2 and 1/2, operation’s law, analysis in theory, and results of circuit simulation are written on this paper. The validity of the proposed converter is confirmed by circuit simulations using SPICE simulator.

Keywords

Direct AC-AC Converters, Power Converters, Switched Capacitor Techniques, Switching Mode Power Supply

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