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川口 将武,榊原 和彦 / 自然科学編120
“まちなみ園芸”の実態とつくり手意識に関する研究 ─京阪地域における戸建住宅地を対象として─
<著者名>  川口 将武,榊原 和彦
<発行年月> 2008年06月
<ISSN> 0287-1394
<概要表示>
 Streetscape-conscious gardening which is done by ordinary citizens is one of the important means of “Hana-to-midori-no-machizukuri” which means town improvement movement with flowers and plants. So a study was carried out aiming to know the actual conditions of the gardening from the view point of desiging and attitude of the residents. The results may be summarized as follows: 1)88% of 76 local goverments which have more than 50,000 population in Kinki Area are working on “Hana-to-midori-no-machizukuri”, 2)gardening forms are classified into 4 types - spotted, linear, two dimensional and three dimensional types, 3)gardening is done for such aims of decoration, presentation, and satisfaction of demands in daily life, 4)most of people hold affirmative and open-minded attitude as to gardening being watched by passers.
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吉川 晃,櫻井 恵三,足立 勝重,沖田 耕三 / 自然科学編120
TiNコーティングハイスドリルによる SUS304の低周波振動ドリル加工
<著者名>  吉川 晃,櫻井 恵三,足立 勝重,沖田 耕三
<発行年月> 2008年06月
<ISSN> 0287-1394
<概要表示>
  In this paper, a friction test was conducted with a friction testing machine to examine the basic interaction phenomena (frictional force, frictional temperature etc.) resulting from adhesion or welding between the test piece (SUS 304) and TiN coating. For comparison, black oxide coated test pieces were employed.   Beside, cutting characteristics (tool life, cutting force, drill wear, etc.) during the drilling of SUS 304 with TiN coated drills was investigated and the results were compared with these of cobalt HSS drills (JIS SKH 56).   The experimental results revealed a marked difference in performance between both type of drills with TiN coated drills showing superiority in every domain.   Moreover the experimental results were compared with those in drilling by cobalt HSS drills. From this study, it is found that cutting characteristic in drilling of SUS 304 by TiN coating drills is more superior to those by cobalt HSS drills.
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常盤 欣一朗,水上 賢一 / 自然科学編120
多重クラスタ誤り訂正2次元線形符号が有する検査点数の下界
<著者名>  常盤 欣一朗,水上 賢一
<発行年月> 2008年06月
<ISSN> 0287-1394
<概要表示>
 Recently, two-dimensional or three-dimensional error correction coding schemes have been widely studied in the context of optical recording applications such as page-oriented optical memories and volume holographic storage. Our main interest is to propose an efficient family of two-dimensional linear codes which can correct multiple cluster-errors. Before giving a code construction method, it is very important to know the number of parity-check bits required for such codes. In this article, a new lower bound is derived on the number of parity-check bits of two-dimensional linear codes capable of correcting multiple cluster-errors.
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