- 著者
- Satoru Fujita Kiyoshi Honda
- 出版者
- 一般社団法人 日本音響学会
- 雑誌
- Acoustical Science and Technology (ISSN:13463969)
- 巻号頁・発行日
- vol.26, no.4, pp.353-357, 2005 (Released:2005-07-01)
- 参考文献数
- 8
- 被引用文献数
- 2 10
Solid models of the vocal tract with hypopharyngeal cavities were molded with a stereolithographic technique based on MRI data obtained from a male speaker during the production of Japanese vowels /a/ and /o/. A vowel synthesis experiment conducted with the models revealed a relatively good agreement in the second and third formants, as well as in anti-resonance at 4–5 kHz. The elimination of the models’ piriform fossa resulted in the disappearance of the anti-resonance and shifts of the adjacent formants. The modification of the laryngeal cavity into a uniform tube caused spectral changes in the frequency range of 1.5–7.0 kHz. These acoustic effects of hypopharyngeal cavities were dependent on vocal tract shapes.
- 著者
- Masahito Sato Satoru Fujita Atushi Saito Yoshio Ikeda Hitoshi Kitazawa Minoru Takahashi Junji Ishiguro Masaaki Okabe Yuichi Nakamura Tsuneo Nagai Hiroshi Watanabe Makoto Kodama Yoshifusa Aizawa
- 出版者
- The Japanese Circulation Society
- 雑誌
- Circulation Journal (ISSN:13469843)
- 巻号頁・発行日
- vol.70, no.8, pp.947-953, 2006 (Released:2006-07-25)
- 参考文献数
- 24
- 被引用文献数
- 70 91
Background On October 23, 2004, a major earthquake, which registered 6.8 on the Richter scale, occurred in Niigata Prefecture in Japan. Emotional stress is important as a trigger of transient left ventricular apical ballooning (so-called `Takotsubo' cardiomyopathy), but its incidence and clinical profile immediately after a natural disaster have not been fully elucidated. Methods and Results `Takotsubo' cardiomyopathy was diagnosed in 16 patients (1 man, 15 women, mean age 71.5 years) within 1 month after the earthquake. Of them, 13 (81%) lived in areas where the Japan Meteorological Agency seismic intensity scale registered 6 or above, and 11 (69%) developed symptoms on the day of the earthquake. The incidence of `Takotsubo' cardiomyopathy 1 month after the earthquake was approximately 24-fold higher near the epicenter than that before the earthquake. Conclusion `Takotsubo' cardiomyopathy can occur on the day of the earthquake in elderly women living near the epicenter. (Circ J 2006; 70: 947 - 953)
- 著者
- Satoru Fujita Jianwu Dang Noriko Suzuki Kiyoshi Honda
- 出版者
- Japanese Stomatological Society
- 雑誌
- Oral Science International (ISSN:13488643)
- 巻号頁・発行日
- vol.4, no.2, pp.97-109, 2007 (Released:2007-12-21)
- 参考文献数
- 21
The tongue possesses a complex muscular structure, and its motor functions are also intricate. Therefore, it would be beneficial to use a computational physiological model of the tongue to examine its vital functions in normal and pathological conditions. Thus far, the studies of tongue models have focused on symmetric movements for normal speech. For clinical purposes, it is necessary to develop a physiological model to deal with daily vital activities such as mastication and swallowing. To do so, we constructed a full 3D physiological model of the tongue based on MRI data from a normal subject, and verified the basic functions of the model based on anatomic and physiological knowledge. In this study, the model was applied to clinical issues: prediction and verification of the changes in movements of the tongue with a tumor before and after partial glossectomy, respectively. Tongue protrusion and lateral bending motion were examined for the prediction and verification. The simulation results were consistent with the observations for a patient with a tumor in the tongue. Comparisons of the simulation and observation in the clinical case showed that the model could predict potential effects of the glossectomy on the tongue movements. It is suggested that the model is a useful tool for pre-operative planning of glossectomy.