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The NAM can be detected using a specially designed microphone, called a NAM microphone, attached to the neck. However, the detected NAM signal has a low signal-to-noise ratio and severely suppressed high-frequency component. To improve NAM clarity, the mechanism of a NAM production must be clarified. In this work, an air flow through a glottis in the vocal tract was numerically simulated using computational fluid dynamics and vocal tract shape models that are obtained by a magnetic resonance imaging (MRI) scan for whispered voice production with various strengths, i.e. strong, weak, and very weak. For a very weak whispering during the MRI scan, subjects were trained, just before the scanning, to produce the very weak whispered voice, or the NAM. 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The NAM can be detected using a specially designed microphone, called a NAM microphone, attached to the neck. However, the detected NAM signal has a low signal-to-noise ratio and severely suppressed high-frequency component. To improve NAM clarity, the mechanism of a NAM production must be clarified. In this work, an air flow through a glottis in the vocal tract was numerically simulated using computational fluid dynamics and vocal tract shape models that are obtained by a magnetic resonance imaging (MRI) scan for whispered voice production with various strengths, i.e. strong, weak, and very weak. For a very weak whispering during the MRI scan, subjects were trained, just before the scanning, to produce the very weak whispered voice, or the NAM. The numerical results show that a weak vorticity flow occurs in the supraglottal region even during a very weak whisper production; such vorticity flow provide aeroacoustic sources for a very weak whispering, i.e. NAM, as in an ordinary whispering."}]}, "item_creator": {"attribute_name": "\u8457\u8005", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "Otani,  Makoto"}], "nameIdentifiers": [{"nameIdentifier": "37769", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "Hirahara,  Tatsuya"}], "nameIdentifiers": [{"nameIdentifier": "37770", "nameIdentifierScheme": "WEKO"}]}]}, "item_files": {"attribute_name": "\u30d5\u30a1\u30a4\u30eb\u60c5\u5831", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_date", "date": [{"dateType": "Available", "dateValue": "2015-09-28"}], "displaytype": "detail", "download_preview_message": "", "file_order": 0, "filename": "Numerical_Simulation_Air_Flow_through_Glottis.pdf", "filesize": [{"value": "948.8 kB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_free", "mimetype": "application/pdf", "size": 948800.0, "url": {"label": "Numerical_Simulation_Air_Flow_through_Glottis.pdf", "url": "https://soar-ir.repo.nii.ac.jp/record/12402/files/Numerical_Simulation_Air_Flow_through_Glottis.pdf"}, "version_id": "2c83d40b-62be-4ef4-aaa6-647edb00be47"}]}, "item_keyword": {"attribute_name": "\u30ad\u30fc\u30ef\u30fc\u30c9", "attribute_value_mlt": [{"subitem_subject": "non-audible murmur", "subitem_subject_scheme": "Other"}, {"subitem_subject": "whispered voice", "subitem_subject_scheme": "Other"}, {"subitem_subject": "whispered voice production mechanism", "subitem_subject_scheme": "Other"}, {"subitem_subject": "computational fluid dynamics", "subitem_subject_scheme": "Other"}, {"subitem_subject": "airflow through glottis", "subitem_subject_scheme": "Other"}]}, "item_language": {"attribute_name": "\u8a00\u8a9e", "attribute_value_mlt": [{"subitem_language": "eng"}]}, "item_resource_type": {"attribute_name": "\u8cc7\u6e90\u30bf\u30a4\u30d7", "attribute_value_mlt": [{"resourcetype": "journal article", "resourceuri": "http://purl.org/coar/resource_type/c_6501"}]}, "item_title": "Numerical Simulation of Air Flow through Glottis during Very Weak Whisper Sound Production", "item_titles": {"attribute_name": "\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_title": "Numerical Simulation of Air Flow through Glottis during Very Weak Whisper Sound Production"}]}, "item_type_id": "6", "owner": "1", "path": ["1221/1222"], "permalink_uri": "http://hdl.handle.net/10091/15983", "pubdate": {"attribute_name": "\u516c\u958b\u65e5", "attribute_name_i18n": "\u516c\u958b\u65e5", "attribute_value": "2012-09-21"}, "publish_date": "2012-09-21", "publish_status": "0", "recid": "12402", "relation": {}, "relation_version_is_last": true, "title": ["Numerical Simulation of Air Flow through Glottis during Very Weak Whisper Sound Production"], "weko_shared_id": null}