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Effect of Annealing Temperature on Magnetic Properties of Dust Cores
Mitani Hiroyuki,Akagi Nobuaki,Houjou Hirofumi,Kanamaru Moriyoshi 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Magnetic Properties of dust cores made of mixtures of atomized pure iron powder and pure alumina powder has been investigated in the temperature range from 673 to 1073K. The effect of annealing on coercivity has been positive effect up to 973K and thus coercivity is gradually reduced form 280A/m (as-compressed) to 160A/m (973K). However, dust cores annealed at 1073K displayed a 15% increasing of coercivity by annealing at 973K. Hysteresis loss shows a tendency similar to coercivity. Microstructure observation of specimens shows grain refinement by recrystallization in the temperature range from 773 to 1073K.
大学院生の研究論文の要旨作成における課題 ― 日本語教育学専攻の大学院生の要旨作成調査を通して ―
三谷彩華 ( Mitani Ayaka ) 한국일어교육학회 2022 일본어교육연구 Vol.- No.59
本研究は、これから論文を執筆する大学院生の論文要旨に関するスキーマ形成のために必要な学習項目を提示することを最終目標とし、大学院生の要旨作成上の意識と課題を、作成された要旨分析とインタビュー分析から明らかにすることを目的としている。日本語教育学を専攻する大学院修士課程在籍生全10名に、調査者が指定した研究論文の要旨を作成してもらい、その後、主に①要旨とは何か、②どのような手順で要旨を作成したか、③作成していて難しかった点は何かを問う半構造化インタビューを行った。調査後、作成された要旨は文章構造分析を行い、要旨の構成要素とその分量を数値で示した。インタビューデータは文字化し、複数名によるコーディング作業を行った。 要旨の文章構造分析では、「研究目的」「結論」といった要旨に必須の構成要素が書かれていることが確認できた一方で、要旨に書く構成要素の選択と、各構成要素の分量についての課題も明らかになった。また、インタビューのコーディングにより、要旨とは何かといった認識はあるものの、文章構造分析で挙げられた課題のほかに、「まとめる」「探す」「選ぶ」といった要約に関するコードが要旨作成上の困難点として抽出された。 以上から、本稿では、(1)要旨の構成要素を知ること、(2)決められた字数の中での各構成要素の分量を知ること、(3)(1)・(2)に合わせ、本文のどこからどのように要約すればいいかを知ることの三点の課題を明らかにした。 The goal of this paper is to give the necessary learning items for the schema of the abstracts of academic papers for graduate students who are going to write papers. By examining the abstracts written in Japanese by graduate students as well as interviews with them, this paper aims to reveal the awareness and difficulties faced by graduate students in writing abstracts in Japanese. I asked 10 graduate students enrolled in the master's program majoring in Japanese language education to write the abstract, and then I conducted a semi-structured interview with each of them. It was mainly about (1) what the abstract is, (2) how to write the abstract, and (3) what was difficult to write. After the survey, abstracts were analyzed by discourse analysis, and the components of each abstract and their quantities were shown numerically. The interview data was transcribed and qualitatively coded by multiple people. In the discourse analysis of the abstracts, it was revealed that the abstracts students wrote includes the ’purpose’ and the ’conclusion.’ On the other hand, problems about the selection of the components of the abstract and the amounts of components were clearly demonstrated. In addition, by the coding of the interviews, although they recognized what an abstract is, the issue mentioned in the discourse analysis, the code related to the abstract such as ’summary’, ’search’, and ’select’ were extracted difficulties in writing abstracts. The result of this survey clearly shows three learning items that (1) to know the components of the abstract, (2) to know the amount of each components of the abstract, (3) to know where and how to summarize the paper.
Koki Mitani,Toshiyuki Takahashi,Shinya Tokunaga,Tomoo Inoue,Ryo Kanematsu,Manabu Minami,Junya Hanakita 대한척추신경외과학회 2023 Neurospine Vol.20 No.4
Objective: The treatment of osteoporotic vertebral compression fractures (OVCFs) is based on their severity; however, an efficient prediction tool is lacking. We aimed to evaluate the validity of the osteoporotic fracture classification (OF classification) and scoring system (OF score) in predicting the treatment strategy for patients with OVCF, defined according to the Japanese criteria. Methods: We retrospectively investigated 487 consecutive patients diagnosed with vertebral body fractures between January 2018 and December 2022. Only patients with their fresh vertebral fracture episode during the study period were included. Patients were classified into 3 groups: conservative treatment, balloon kyphoplasty (BKP), and open surgery. OF classification and OF scores were assessed for each patient. Results: A total of 237 patients with OVCF were included. There were 127, 81, and 29 patients in the conservative, BKP, and open surgery groups, respectively. The OF score was significantly higher in the BKP and open surgery groups than in the conservative group (p < 0.001). Multivariate logistic regression analysis showed that antiosteoporotic drug use, OF classification, progressive deformity, neurological symptoms and mobilization were independent risk factors for operative treatment (all p < 0.001). Receiver operating characteristic analysis showed that the cutoff OF score for operative indication was 5.5, with a sensitivity of 91.9%, specificity of 56.5%, and area under the curve of 0.820 (95% confidence interval, 0.769–0.871). Conclusion: The OF score identified patients who required operative treatment with a high degree of accuracy. This is especially important for ruling out patients who definitely require operative treatment.