著者
大城 諒士 塩塚 大志 原田 繁実 金子 英治 井上 喜乃 倉田 智成 横倉 邦夫
出版者
一般社団法人 電気学会
雑誌
電気学会論文誌E(センサ・マイクロマシン部門誌) (ISSN:03854213)
巻号頁・発行日
vol.138, no.9, pp.791-798, 2018
被引用文献数
2

<p>Surge voltages often have much higher value and changing rate than those of power frequency voltages, and might cause damages to apparatuses or equipment not only on near a surge source, for example lightning struck point, but also on far points from it due to propagating. In addition, surge phenomena often become complex due to the reflections and the superpositions on a point where surge impedances having different value are connected. The surge phenomenon occurring on a power cables connected with a transmission tower is one of these cases. This research's goal is to propose the EMTP model for surge phenomenon occurring on cables arranged through a transmission tower. The proposed model simulates such cable by using a cable model through a pipe conductor. The results calculated by the proposed model ware compared with the results by VSTLrev (Virtual Surge Test Lab. Restructured and Extended Version) which is a surge analysis program based on FDTD (Finite Difference Time Domain) method to verify the accuracy of the proposed model. As a result, the proposed model is reasonable for analysis of a surge phenomenon occurring on a cable through a transmission tower.</p>
著者
塩塚 大 鵜林尚靖 亀井 靖高
出版者
情報処理学会
雑誌
情報処理学会論文誌 (ISSN:18827764)
巻号頁・発行日
vol.53, no.2, pp.631-643, 2012-02-15

プログラマはデバッグに多くの時間を費やす傾向がある.プログラマはエラーの現象をチェックしたり,様々なコード上の箇所を行き来したり,あるいはバグ修正履歴を探索したりして,コードを修正する.このような一連のデバッグ作業を自動化することができれば,他の生産的な作業に時間を割くことができる.本論文では,この問題に対処する方法として,デバッグ支援のための関心事指向推薦システムdcNavi(Debug Concern Navigator)を提案する.dcNaviでは,リポジトリに含まれるプログラム情報やテスト結果,および修正履歴を活用することで,デバッグの関心事に応じた適切なヒントを提供する.本論文では,Eclipseプラグインプロジェクトに関する9つのオープンソースリポジトリを対象に,再利用性の観点からバグ修正履歴に基づいた推薦の有効性についても評価する.Programmers tend to spend a lot of time debugging code. They check the erroneous phenomena, navigate the code, search the past bug fixes, and modify the code. If a sequence of these debug activities can be automated, programmers can use their time for more creative tasks. To deal with this problem, we propose dcNavi (Debug Concern Navigator), a concern-oriented recommendation system for debugging. The dcNavi provides appropriate hints to programmers according to their debug concerns by mining a repository containing not only program information but also test results and program modification history. In this paper, we evaluate the effectiveness of our approach in terms of the reusability of past bug fixes by using nine open source repositories created in the Eclipse plug-in projects.