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Hideki NAKAJIMA Takako ITOH Yakichi KANATA
The purpose of this paper is to facilitate an objective diagnosis of a disordered retina on the stand point of engineering. We have analyzed the frequency of every ERG (electroretinogram) with the MEM (maximum entropy method) algorithm to distinguish the normal ERG from the disordered ERGs.
Masanobu MATSUDA Yakichi KANATA
The authors report about the basic theory and the experimental results of a new highly stable dc voltage regulator with high efficiency by the method of switching and continuous control. A key point of this circuit is to do switching control of the input voltage in order to regulate the voltage across the series control element so as to become a required minimum value.
Yoshihiko TAMURA Yakichi KANATA
An electroretinogram (ERG), which shows output characteristic of retina, is useful in the clinical aspect. Then, we have constructed an electronic model to simulate a scotopic human ERG considering physiological observations.
Yutaka MAEDA Takayuki AKASHI Yakichi KANATA
The electroretinogram (ERG) is used to diagnose many kinds of eye diseases. Our final purpose in this paper is a detection of diabetic retinopathy by using only ERG. In this paper, we describe a method to examine whether presented ERG data belong to a group of diabetic retinopathy. The ERG mainly consists of the a-wave, the b-wave and the oscillatory potential (op-wave). It was known that the op-wave varies as progress of retinopathy. Thus, we use the latency, the amplitude and the peak frequency of the op-wave. First, we study these features of sample ERG data, statistically. It was clarified that some of these characteristics are significantly different between a normal group and a group of diabetic retinopathy. By using some of these characteristics, we classify unknown ERG data on the basis of the Mahalanobis' generalized distance or the linear discriminant function. The highest accuracy of this method for the unknown data is about 92.73%.
Kazuhiro SHIMOJIMA Takako ITOH Yakichi KANATA
An electronic model, which can simulate a scotopic electroretinogram (ERG), has been manufactured for trial. And we have obtained the effective clues to clarify technologically the mechanism of the generation of the scotopic ERG components.
Yoshio NAKATANI Yakichi KANATA
This paper describes a basic theory and the experimental results of a RCC (Ringing Choke Converter) in which a MOS FET is used as the switching element and the driving circuit has been modified to improve the efficiency and the characteristics under no-load conditions.