We propose a sound source separation method to extract target sounds from multiple sounds observed at binaural microphones worn by a user. The proposed method estimates the respective sound source position from the slope and variance of the spectral phase difference of two signals observed at the binaural microphones. Based on the estimated sound source positions, the proposed method separates all the sounds and extracts only the sounds that arrived from the target area specified by the user. Simulation and real-environmental experiment results show that the proposed method efficiently gives the sounds whose sources exist in the target area.

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10.1541/ieejeiss.144.267

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Transmission Electron Microscopic Characterization of Hypersensitive Human Radicular Dentin

Journal of Dental Research (1990)

Masahiro Yoshiyama Yuichiro Noiri Kazumi Ozaki A. Uchida Yasuko Ishikawa

Transmission electron microscopy (TEM) and x-ray microanalysis (XMA) were used for the study of the ultrastructure of the lumens of dentinal tubules in superficial layers of dentin specimens obtained by use of a new biopsy technique from both hypersensitive and naturally desensitized areas of exposed root surfaces, in vivo. The TEM images showed clearly that the lumens of most of the tubules were occluded with mineral crystals in naturally desensitized areas, but such lumens were empty and surrounded with peritubular and intertubular dentin in hypersensitive areas. Moreover, electron-dense structures that lined peritubular dentin were observed in the empty lumens of dentinal tubules.

Dentinal Tubule

Electron probe microanalysis

10.1177/00220345900690061401

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Scanning Electron Microscopic Characterization of Sensitive vs. Insensitive Human Radicular Dentin

Journal of Dental Research (1989)

Masahiro Yoshiyama J. Masada A. Uchida Hiroshi Ishida

Our aim was to investigate the structural changes of dentinal tubules in specimens obtained from both hypersensitive and naturally desensitized areas in wedge-shaped defects on the same exposed cervical dentin surface of a hypersensitive tooth. A new biopsy technique that makes use of a hollow, cylindrical diamond bur was designed so that specimens from exposed root dentin of vital teeth could be obtained. Twenty-two dentin biopsy pairs were divided into two groups; one was prepared for scanning electron microscopy (SEM) and the other for microradiography (MR). Small hypersensitive areas were identified by a scratch test on exposed human dentin in vivo. SEM observation of the dentin biopsies showed that the orifices of many dentinal tubules in hypersensitive areas were open and that membranous structures appeared on the walls of dentinal tubules. In naturally desensitized areas on the same dentin surface, most of the dentinal tubules were obturated with rhombohedral crystals of all sizes; membranous structures were not observed in these tubules. These results showed that hypersensitivity occurred on the exposed dentin when most of the tubular orifices were open.

Dentinal Tubule

Dentin hypersensitivity

10.1177/00220345890680110601

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Sialolithiasis in children: report of four cases.

Dentomaxillofacial Radiology (1996)

Yasushi Shinohara Tatsumi Hiromatsu Yasunobu Nagata A. Uchida Tadashi Nakashima

Sialolithiasis in children is rare. Four cases of sialolithiasis in the submandibular gland occurring in children < or = 10 years old are reported. True and distal oblique occlusal radiographs were found to be useful for detection of the sialolith. A review of the literature on sialolithiasis in children is presented.

10.1259/dmfr.25.1.9084286

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Citations (22)