{"created":"2023-07-25T08:04:17.137263+00:00","id":2457,"links":{},"metadata":{"_buckets":{"deposit":"dcea78ac-77aa-453c-90a4-7d00963c8cac"},"_deposit":{"created_by":3,"id":"2457","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"2457"},"status":"published"},"_oai":{"id":"oai:ir.kagoshima-u.ac.jp:00002457","sets":["228:262:5781"]},"author_link":["101534","101536","101535"],"item_7_alternative_title_18":{"attribute_name":"別言語のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Fundamental Studies on the Variations in Scattering Patterns and Echo Shapes of Fish"}]},"item_7_alternative_title_19":{"attribute_name":"タイトルよみ","attribute_value_mlt":[{"subitem_alternative_title":"ギョタイ ノ チョウオンパ ハンシャ シコウセイ パターン オヨビ ハンシャ ハケイ ノ ヘンドウ ニ カンスル キソテキ ケンキュウ"}]},"item_7_biblio_info_5":{"attribute_name":"収録雑誌名","attribute_value_mlt":[{"bibliographicIssueNumber":"2","bibliographicPageEnd":"138","bibliographicPageStart":"69","bibliographicVolumeNumber":"43","bibliographic_titles":[{"bibliographic_title":"鹿児島大学水産学部紀要=Memoirs of Faculty of Fisheries Kagoshima University"}]}]},"item_7_date_6":{"attribute_name":"作成日","attribute_value_mlt":[{"subitem_date_issued_datetime":"1994-12-25"}]},"item_7_description_4":{"attribute_name":"要約(Abstract)","attribute_value_mlt":[{"subitem_description":"In recent years, quantitative echo sounders are generalized to survey fish stocks. An echo integration method using fish target strength (TS) as principal parameter is investigated and improved the accuracy. On one hand, the estimation of individual fish which are determination of fish species or body length is incompletely. A great deal of effort has been made on this problem. What seems to be lacking, however, is direct information in the echo signals. Periodic change in scattering patterns and wave-form variation of reverberation are discussed in this dissertation, in order to obtain informations of an individual fish. Some basic experiments to observe the echo shapes and periodic changes in scattering patterns are described in Chapter 2. The results of these experiments are explained theoretically in Chapter 3. A period of changes in a scattering pattern can be applied to estimate the distance between two acoustic sources. In Chapter 4, an experiment with two steel balls, the distance between two acoustic sources was calculated from the periodic change of the scattering pattern by using an auto-correlation function. It was confirmed that the period of the carrier changed appreciably when the echo amplitude was cancelled due to interference. This phenomenon will be used to indicate a state of interference on wave form fluctuation.","subitem_description_type":"Other"},{"subitem_description":"In experiments with eight species individual fishes, the echo pattern showed a periodic change which was estimated to be caused by interference. Also the period of the carrier fluctuated in the cancelled condition. In Chapter 5, the results of these measurements are described. The Spectrum of scattering patterns from individual fishes are analyzed in order to clarify the cause of periodic changes in dorsal aspect scattering patterns. Three species into target fishes were measured in three states, whole, without bladder, and skeleton. The power spectrum was calculated from scattering patterns which transformed to distance-amplitude coordinates from incidence angle-amplitude coordinates. The elemental patterns and power proportion of each frequency band were calculated by using convolution integration of the power spectrum and filter-function in the frequency region. Analysis shows that a relationship was observed between fish species, or fish figure, and the characteristics of the changing period. Chapter 6 contains a summary of this research and discussion about an application of information included in echo shape.","subitem_description_type":"Other"}]},"item_7_full_name_2":{"attribute_name":"著者よみ","attribute_value_mlt":[{"nameIdentifiers":[{}],"names":[{"name":"ヤマナカ, ユウイチ"}]}]},"item_7_full_name_3":{"attribute_name":"別言語の著者","attribute_value_mlt":[{"nameIdentifiers":[{}],"names":[{"name":"YAMANAKA, Yuichi"}]}]},"item_7_publisher_23":{"attribute_name":"公開者・出版者","attribute_value_mlt":[{"subitem_publisher":"鹿児島大学"}]},"item_7_source_id_7":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0453087X","subitem_source_identifier_type":"ISSN"}]},"item_7_source_id_9":{"attribute_name":"NII書誌ID","attribute_value_mlt":[{"subitem_source_identifier":"AN00040498","subitem_source_identifier_type":"NCID"}]},"item_7_subject_15":{"attribute_name":"NDC","attribute_value_mlt":[{"subitem_subject":"660","subitem_subject_scheme":"NDC"}]},"item_7_text_24":{"attribute_name":"公開者よみ","attribute_value_mlt":[{"subitem_text_value":"カゴシマ ダイガク"}]},"item_7_text_25":{"attribute_name":"公開者別名","attribute_value_mlt":[{"subitem_text_value":"Kagoshima University"}]},"item_7_version_type_14":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"山中, 有一"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2016-10-27"}],"displaytype":"detail","filename":"AN00040498_v43n2_p69-138.pdf","filesize":[{"value":"15.1 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"AN00040498_v43n2_p69-138.pdf","url":"https://ir.kagoshima-u.ac.jp/record/2457/files/AN00040498_v43n2_p69-138.pdf"},"version_id":"4a2964d0-594f-42b8-b4f4-55194a54a4c8"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"Echo sounder","subitem_subject_scheme":"Other"},{"subitem_subject":"Scattering pattern","subitem_subject_scheme":"Other"},{"subitem_subject":"Echo shape","subitem_subject_scheme":"Other"},{"subitem_subject":"Interference","subitem_subject_scheme":"Other"},{"subitem_subject":"Frequency analysis","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"魚体の超音波反射指向性パターンおよび反射波形の変動に関する基礎的研究","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"魚体の超音波反射指向性パターンおよび反射波形の変動に関する基礎的研究"}]},"item_type_id":"7","owner":"3","path":["40","5781"],"pubdate":{"attribute_name":"公開日","attribute_value":"2015-04-30"},"publish_date":"2015-04-30","publish_status":"0","recid":"2457","relation_version_is_last":true,"title":["魚体の超音波反射指向性パターンおよび反射波形の変動に関する基礎的研究"],"weko_creator_id":"3","weko_shared_id":3},"updated":"2024-01-30T05:47:12.168727+00:00"}