{"created":"2023-05-15T12:31:07.778274+00:00","id":689,"links":{},"metadata":{"_buckets":{"deposit":"1fbf7850-ccd8-4f05-b710-7b8d3d2e50e2"},"_deposit":{"created_by":6,"id":"689","owners":[6],"pid":{"revision_id":0,"type":"depid","value":"689"},"status":"published"},"_oai":{"id":"oai:fit.repo.nii.ac.jp:00000689","sets":["256:257:366"]},"author_link":["3222","3220","3221"],"item_3_alternative_title_23":{"attribute_name":"タイトル（ヨミ）","attribute_value_mlt":[{"subitem_alternative_title":"イメージ ホウ ニヨル レイ タンサク アルゴリズム"}]},"item_3_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1999-03-15","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"2","bibliographicPageEnd":"247","bibliographicPageStart":"241","bibliographicVolumeNumber":"31","bibliographic_titles":[{"bibliographic_title":"福岡工業大学研究論集"}]}]},"item_3_description_17":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_3_description_47":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"subitem_description":"論文(Article)","subitem_description_type":"Other"}]},"item_3_description_5":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"This paper is concerned with a ray searching algorithm based on the imaging method for a three-dimensional (3D) closed space such as a tunnel, underground, office room as well as for a rough surface. First, the fundamental theory of the algoritm is described. Next, it is demonstrat­ed that the algorithm becomes simple when the closed space has a kind of symmetrical property. In this case the extension from two-dimensional (2D) rays to 3D ones is possible. Finally numerical ray examples are shown in 2D and 3D ways for some kinds of structures. 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