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A neuron MOS current mirror with a transimpedance amplifier
Akio Shimizu,Sumio Fukai,Yohei Ishikawa 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper, we proposed a neuron MOS current mirror with a transimpedance amplifier. The conventional circuit is composed of a voltage amplifier and resistances. However, the resistance voltage drop makes operating range narrow. The proposed circuit is composed of the transimpedance amplifier. And the proposed circuit will be high current copy accuracy and wide operating range. The neuron MOS current mirrors are designed by using device parameter of the standard CMOS 1.2㎛ process. The performance of the proposed circuit is evaluated by HSPICE simulation. Simulation results show that the proposed circuit has better current copy accuracy without the resistances, and low voltage operation.
WAYS OF NEXT GENERATION REFRIGERANTS AND HEAT PUMP/REFRIGERATION SYSTEMS
AKIO MIYARA,YOJI ONAKA,SHIGERU KOYAMA 대한설비공학회 2012 International Journal Of Air-Conditioning and Refr Vol.20 No.1
Since measures of the global warming are becoming urgent issues, various technical innovations and social system reformations are being promoted. In the engineering fields of heating, refrigerating, and air-conditioning, the global warming caused by the refrigerants is a big problem that must be solved. At the present stage, however, there are no perfect solutions for next generation refrigerants and heat pump/refrigeration systems by which the global warming is successfully prevented. Therefore, we have to search possible ways to the next generation. In this paper, important four ways which are (1) natural refrigerants, (2) low GWP synthetic refrigerants, (3) refrigerant management, and (4) refrigerant mixtures are introduced. For the refrigerant mixture which are CO2/DME and HFO-1234ze(E)/HFC-32, cycle simulations have been conducted under different operation modes. COP of the mixtures has a maximum at certain concentration and they are higher than those of conventional refrigerants. From a drop-in test of HFO-1234ze(E)/HFC-32, feasibility of the refrigerant mixture has been proved.
Akio Ogihara,Naoya Inoue,Motoi Iwata,Akira Shiozaki 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
The objective of this work is to increase the capacity of watermark information in the audio watermarking method based on amplitude modification. We increase the capacity of watermark information by dividing a GOS (Group of Samples) into five sections.