{"_buckets": {"deposit": "e34c6d7b-44b4-42a7-bb1b-e368898e5789"}, "_deposit": {"id": "32257", "owners": [], "pid": {"revision_id": 0, "type": "depid", "value": "32257"}, "status": "published"}, "_oai": {"id": "oai:repository.dl.itc.u-tokyo.ac.jp:00032257", "sets": []}, "author_link": ["71996", "71997", "71998", "71999", "71992", "71993", "71994", "71995"], "item_4_alternative_title_1": {"attribute_name": "\u305d\u306e\u4ed6\u306e\u30bf\u30a4\u30c8\u30eb", "attribute_value_mlt": [{"subitem_alternative_title": "Precise Acoustic Ranging System Using Ultrasonic Waves"}]}, "item_4_biblio_info_7": {"attribute_name": "\u66f8\u8a8c\u60c5\u5831", "attribute_value_mlt": [{"bibliographicIssueDates": {"bibliographicIssueDate": "1999", "bibliographicIssueDateType": "Issued"}, "bibliographicPageEnd": "73", "bibliographicPageStart": "65", "bibliographicVolumeNumber": "5", "bibliographic_titles": [{"bibliographic_title": "\u6280\u8853\u5831\u544a"}]}]}, "item_4_description_5": {"attribute_name": "\u6284\u9332", "attribute_value_mlt": [{"subitem_description": "The Philippine Sea Plate and Pacific Plate are subducting under the Japanese Islands. Large earthquakes have occurred along these pla te boundaries. It is important to measure the amount of movement of the plate directly for the research of earthquake occurrences. Ultrasonic waves are used for precise positioning of a reference point on the seafloor, where electromagnetic waves and lights are not transmittable in the sea water. For seafloor positioning with a precision of several cm, we developed an acoustic ranging system using linear FM signals around 10 kHz. This report describes the measurement experiments using this system carried out in Osaka Bay. It is confirmed that precision of the acoustic ranging is 3 cm or less by the experiments under the condition of calm water. However, occasionally acoustic signals were disturbed by the multiplex resections at the sea surface and/or the seafloor. It is important that the transducer of the surface unit is installed at the good position apart longer than 1.3 m from reflectors such as the bottom of the ship.", "subitem_description_type": "Abstract"}]}, "item_4_description_6": {"attribute_name": "\u5185\u5bb9\u8a18\u8ff0", "attribute_value_mlt": [{"subitem_description": "\uff1c\u7dcf\u8aac\uff1e", "subitem_description_type": "Other"}]}, "item_4_full_name_3": {"attribute_name": "\u8457\u8005\u5225\u540d", "attribute_value_mlt": [{"nameIdentifiers": [{"nameIdentifier": "71996", "nameIdentifierScheme": "WEKO"}], "names": [{"name": "MATSUO, Shigemitsu"}]}, {"nameIdentifiers": [{"nameIdentifier": "71997", "nameIdentifierScheme": "WEKO"}], "names": [{"name": "HIRANO, Norio"}]}, {"nameIdentifiers": [{"nameIdentifier": "71998", "nameIdentifierScheme": "WEKO"}], "names": [{"name": "KATAO, Hiroshi"}]}, {"nameIdentifiers": [{"nameIdentifier": "71999", "nameIdentifierScheme": "WEKO"}], "names": [{"name": "ANDO, Masataka"}]}]}, 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[{"subitem_text_value": "Departmental Bulletin Paper"}]}, "item_4_text_4": {"attribute_name": "\u8457\u8005\u6240\u5c5e", "attribute_value_mlt": [{"subitem_text_value": "\u4eac\u90fd\u5927\u5b66\u9632\u707d\u7814\u7a76\u6240\u6280\u8853\u5ba4"}, {"subitem_text_value": "\u5730\u9707\u4e88\u77e5\u7814\u7a76\u30bb\u30f3\u30bf\u30fc"}, {"subitem_text_value": "Division of Technical Affairs"}, {"subitem_text_value": "Research Center for Earthquake Prediction, Disaster Prevention Research Institute, Kyoto University"}]}, "item_creator": {"attribute_name": "\u8457\u8005", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "\u677e\u5c3e, \u6210\u5149"}], "nameIdentifiers": [{"nameIdentifier": "71992", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "\u5e73\u91ce, \u61b2\u96c4"}], "nameIdentifiers": [{"nameIdentifier": "71993", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "\u7247\u5c3e, \u6d69"}], "nameIdentifiers": 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