{"created":"2024-06-26T06:38:58.169400+00:00","id":2000319,"links":{},"metadata":{"_buckets":{"deposit":"6b6488d9-2498-4733-bcb7-93f9746e1bad"},"_deposit":{"created_by":10,"id":"2000319","owner":"10","owners":[10],"pid":{"revision_id":0,"type":"depid","value":"2000319"},"status":"published"},"_oai":{"id":"oai:shiga-u.repo.nii.ac.jp:02000319","sets":["1476:1719287193415:1719287122206"]},"author_link":[],"control_number":"2000319","item_10_biblio_info_8":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2024-03-25","bibliographicIssueDateType":"Issued"}}]},"item_10_date_granted_66":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2024-03-25"}]},"item_10_degree_grantor_64":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_language":"ja","subitem_degreegrantor_name":"滋賀大学"}],"subitem_degreegrantor_identifier":[{"subitem_degreegrantor_identifier_name":"14201","subitem_degreegrantor_identifier_scheme":"kakenhi"}]}]},"item_10_degree_name_63":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士（データサイエンス）","subitem_degreename_language":"ja"}]},"item_10_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Discovering causal relationships between quantities of interest is fundamental in many scientific disciplines. This thesis focuses on the field of manufacturing, where data-driven quality improvements are attracting increasing attention because of the more diverse data accumulated in the wake of Industry 4.0 and digital transformation. Understanding the causal relations among the various measurements, such as those of product qualities, machine parameters, and manufacturing environment, is crucial for data-driven quality improvement activities.\nAlthough controlled experiments are the recommended approach to infer cause?effect relations, such experiments can be unethical, technically challenging, or too expensive. For example, manufacturing a set of defective products during mass production is unrealistic, as it decreases overall equipment effectiveness and might affect subsequent products. Numerous methods have been developed to estimate causal relationships from observational data, termed causal discovery, to tackle this issue.\nResearch that applies causal discovery methods to manufacturing data assumes that the data exhibit non-linearity, temporal dependencies, or both. However, they overlook a typical characteristic of manufacturing data, heteroscedasticity, which causes severe problems with many existing causal discovery methods. Another issue is handling groups of variables; when multiple measurements take similar values, selecting one of them or aggregating them by taking an average may impede the estimation performance. Several existing works on causal discovery address the aforementioned issues individually but not simultaneously.\nThis thesis addresses the problem of performing causal discovery on non-linear timeseries data with heteroscedastic noise. We introduce an estimation method based on recently developed continuous optimization-based methods. Then, we extend the work to exploit the time structure and show that causal relationships can be uniquely recovered from data under specific assumptions. Furthermore, this thesis considers the problem of estimating causal relationships among multiple groups of variables where the functional relations are beyond linear. We propose a novel approach based on algebraic characterization of causal structure among multiple groups of variables that can be used as a constraint for the optimization problem on existing continuous optimization-based methods.","subitem_description_language":"en","subitem_description_type":"Abstract"}]},"item_10_dissertation_number_70":{"attribute_name":"学位授与番号","attribute_value_mlt":[{"subitem_dissertationnumber":"甲第50号"}]},"item_10_version_type_17":{"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_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"open access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_abf2"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorAffiliations":[{"affiliationNames":[{"affiliationName":"Shiga University","affiliationNameLang":"en"},{"affiliationName":"滋賀大学","affiliationNameLang":"ja"},{"affiliationName":"シガ ダイガク","affiliationNameLang":"ja-Kana"}]}],"creatorNames":[{"creatorName":"Kikuchi, Genta","creatorNameLang":"en"},{"creatorName":"菊池, 元太","creatorNameLang":"ja"},{"creatorName":"キクチ, ゲンタ","creatorNameLang":"ja-Kana"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_access","date":[{"dateType":"Available","dateValue":"2024-07-05"}],"displaytype":"detail","filename":"博士論文全文甲50.pdf","filesize":[{"value":"4 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"博士論文全文甲50.pdf","objectType":"fulltext","url":"https://shiga-u.repo.nii.ac.jp/record/2000319/files/博士論文全文甲50.pdf"},"version_id":"50c2821c-08b1-452e-941d-936f139b9786"},{"accessrole":"open_access","date":[{"dateType":"Available","dateValue":"2024-07-05"}],"displaytype":"detail","filename":"博士論文審査要旨甲50.pdf","filesize":[{"value":"177 KB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"博士論文審査要旨甲50.pdf","objectType":"other","url":"https://shiga-u.repo.nii.ac.jp/record/2000319/files/博士論文審査要旨甲50.pdf"},"version_id":"8283d27c-faf9-42de-a2b3-d31f72c6c84f"},{"accessrole":"open_access","date":[{"dateType":"Available","dateValue":"2024-07-05"}],"displaytype":"detail","filename":"博士論文要旨甲50.pdf","filesize":[{"value":"187 KB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"博士論文要旨甲50.pdf","objectType":"abstract","url":"https://shiga-u.repo.nii.ac.jp/record/2000319/files/博士論文要旨甲50.pdf"},"version_id":"eeda23f4-3697-430c-a666-1102910ca172"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"doctoral thesis","resourceuri":"http://purl.org/coar/resource_type/c_db06"}]},"item_title":"Toward Discovering Causal Relations from Manufacturing Data: Heteroscedasticity and Variable Groups","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Toward Discovering Causal Relations from Manufacturing Data: Heteroscedasticity and Variable Groups","subitem_title_language":"en"},{"subitem_title":"製造データからの因果関係発見に向けて：分散不均一性と変数グループについて","subitem_title_language":"ja"},{"subitem_title":"セイゾウ データ カラ ノ インガ カンケイ ハッケン ニ ムケテ : ブンサン フキンイツセイ ト ヘンスウ グループ ニ ツイテ","subitem_title_language":"ja-Kana"}]},"item_type_id":"10","owner":"10","path":["1719287122206"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2024-06-21"},"publish_date":"2024-06-21","publish_status":"0","recid":"2000319","relation_version_is_last":true,"title":["Toward Discovering Causal Relations from Manufacturing Data: Heteroscedasticity and Variable Groups"],"weko_creator_id":"10","weko_shared_id":-1},"updated":"2024-07-05T09:08:06.489172+00:00"}