著者
解放社編
出版者
大鐙閣
巻号頁・発行日
1921

1 0 0 0 OA 官報

著者
大蔵省印刷局 [編]
出版者
日本マイクロ写真
巻号頁・発行日
vol.1942年12月24日, 1942-12-24
著者
橋本 高志良 江藤 正通 堀場 匠一朗 津邑 公暁 松尾 啓志
雑誌
先進的計算基盤システムシンポジウム論文集
巻号頁・発行日
vol.2013, pp.162-169, 2013-05-15

マルチコア環境では,一般的にロックを用いて共有変数へのアクセスを調停する.しかし,ロックには並列性の低下やデッドロックの発生などの問題があるため,これに代わる並行性制御機構としてトランザクショナル・メモリが提案されている.この機構においては,アクセス競合が発生しない限りトランザクションが投機的に実行されるため,一般にロックよりも並列性が向上する.しかし,Readafter-Readアクセスが発生した際に投機実行を継続した場合,その後に発生するストールが完全に無駄となる場合がある.本稿では,このような問題を引き起こすRead-after-Readアクセスを検出し,それに関与するトランザクションを敢えて逐次実行することで,全体性能を向上させる手法を提案する.シミュレーションによる評価の結果,提案手法により最大66.9%の高速化を確認した.
著者
田村 正人
出版者
日本家屋害虫学会
雑誌
家屋害虫 (ISSN:0912974X)
巻号頁・発行日
vol.24, no.1, pp.25-36, 2002-07-30
参考文献数
39
被引用文献数
1

本稿は1940~1952年の農村に於ける伝統的な家屋害虫の防除法,とくに土用干し,ハエ(蝿),カ(蚊)およびネズミ(鼠)の駆除法に対してIPMの光を当てることを目的として総括した.人と昆虫との関わりは古く広く深いので,生活の向上と安定化の歴史は「文化」を生んだものと考えられるので,語源や由来についても若干の考察を試みた.また本学会では,過去5年間「家屋害虫のモニタリング」を年次大会のメーンテーマに連続とり上げているので,ネズミのモニタリングについて,ラットサインによる生息の確認と,記号放逐法や捕殺除去法による個体数の推定を,わかり易く解説した.モニタリングによって防除の要・不要を判断し,さらには防除効果の評価も可能となる.
著者
石橋 貴昭
出版者
日本動物学会
雑誌
動物学雑誌 (ISSN:00445118)
巻号頁・発行日
vol.69, no.11, pp.336-343, 1960-11

The present reports are concerned with the analysis of the action of potassium ion on fish scale melanophores. 1. Using three species of teleosts, Carp (Carassius carassius), Funa (Cyprinus auratus) and Medaka (Oryzias latipes), the experiments were performed to ascertain whether potassium ion acts directly upon the melanophores or stimulates the nervous elements which are left alive in the isolated fish scale. 2. In prolonged application of potassium ion, it was observed that there were differences of reaction according to the locality of the melanophores in a scale. Moreover, the aggregation of the pigment granules within the melanophore which was induced by potassium ion had a transient phenomena. 3.The effectiveness of adrenalin in various concentrations upon the duration of the pigment aggregation to be induced by this agent has been examined. As the concentrations of adrenalin were increased, more and more the duration of pigment aggregation was prolonged. 4. The effect of denervation of the melanophore on the response to potassium ion was studied. The scales were pulled out from their pokets with fine forcepts and immediately slipped back into their pockets, thus severing all connections with the nervous system and allowing time for degeneration. In tests of the effects of denervation on the response to potassium ion during the period of degeneration, the scales which had been withdrawn were compared with normal scales and with scales which had recovered from the denervated state. In three hours after the operation the magnitude of centripetal migration of pigment granules within the melanophore reached only about one-half that of normal scale melanophore. From 18 to 20 hours after the operation, the response of melanophores to potassium ion had disappeared. Corresponding to the passage of time after the operation, however, the response of melanophores was actually re-established and it was the same as that of a normal scale. It may be suggested that these facts have relations with disintegration of the nerve fibers, including terminal structure connected with the melanophore, and a regrowth of them. 5. Both normal and denervated melanophore respond cleary to adrenalin. Furthermore, the melanophores which were originally insensitive to potassium ion, and the redispersed melanophores in prolonged application of this ion, were certainly responsive to adrenalin, thus suggesting a difference between potassium ion and adrenalin in mechanism of action to the melanophore. 6. It was assumed that potassium ion acts indirectly upon the melanophores through the never fibers which are left alive in an isolated acale. The failure or incompleteness of the response to potassium ion of the normal scale melanophores may be also explained by the lack or disintegration of the melanophore nerve.
著者
伊東 敬祐
出版者
公益社団法人 日本地震学会
雑誌
地震 第2輯 (ISSN:00371114)
巻号頁・発行日
vol.50, no.appendix, pp.157-167, 1998-03-31 (Released:2010-11-17)
参考文献数
40

Earthquakes are complex phenomena. The notion of self-organized criticality (SOC) is recently used to explain various kinds of seismological relations expressed as power-laws, such as the size-distribution, the fractal spatio-temporal distribution and the decay of aftershocks. It is often claimed that earthquakes are not predictable if they are critical phenomena It is true that they are not predictable if the earth is at exact criticality. The notion of SOC. however, is not static but is dynamic. The crust gently approaches criticality and breaks down to generate a large earthquake. There are a variety of SOC models of earthquakes. In all of them, most of small and intermediate earthquakes occur while the system is at subcritical state approaching the exact criticality. Large earthquakes mostly occur near the criticality or at the supercritical state. Therefore, large earthquakes differ from small and intermediate ones even in the statistically scale-free SOC models. Large earthquakes in nature also are expected to be unusual events occurring at critical or supercritical states at which physical properties are extemely abnormal. Different SOC models exhibit different precursor phenomena before large events, as observed precursors differ from event to event. There cannot be universal methods to predict every large earthquake, but individual large earthquakes can be expected to have some precursors. It may be careless to reject observed precursors on a reason that they were not always observed before large earthquakes.