1,003 research outputs found

    Feasibility Evaluation of the Statistical Delay Quality Model (SDQM)

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    遅延テストの品質評価には,遷移遅延故障モデルが広く用いられてきた.しかし,論理的な網羅性のみに着目しているため,微小な遅延欠陥の検出能力は明らかでなかった.そこで筆者らは微小な遅延欠陥の検出能力を,半導体製造プロセスの品質,設計の遅延変動に対するロバスト性,テストタイミング精度,及びテストパターンの論理的網羅性を総合的に反映して求める統計的遅延品質モデル(SDQM:statistical delay quality model)を提案し,本論文では,その大規模データに対するフィージビリティを評価した.商用のテスト生成ツールによるテストパターンを用いてSDQM の計算を行い,SDQMの計算の処理時間とメモリ量が適用可能なレベルであることを確認した.また,本モデルを用いたテストパターンの分析により,従来の遷移遅延故障モデルによるテストパターンは,長い論理パスが活性化されて初めて可能になる微小遅延欠陥の検出能力が十分でなく,アルゴリズム改良が必要なことを,定量的に示すことができた

    Water Resources and Environment Assessment in River Basin based on Hydro-BEAM

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    本年度はHydro-BEAM に付加するモジュール及び評価の側面についていくつか検討している。主なものは,水量・水質・生態環境を組み入れた流域水環境モデル,侵食・堆積環境と魚類の生息場,ダム下流流程と浮遊有機物動態,地表面条件とそれが積雲・降雨に及ぼす影響,地球温暖化と流域水資源環境への影響評価,である。In this fiscal year (FY2005), some modules to be added to Hydro-BEAM and some aspects of evaluation have been discussed. Following items are the main topics and included in this report. 1) Regional water circulation processes with water quantity, quality, and ecosystem 2) Difference in habitat preference of Rhinogobius flumineus among erosional and depositional reaches 3) Variation in drift distance of suspended POM in relation to flow regimes and channel geomorphology 4) Effect of land surface condition on convective precipitation over the mountainous region in Lake Biwa during the summer season 5) Impact assessment on water resources environment in river basin due to global warming本年度はHydro-BEAM に付加するモジュール及び評価の側面についていくつか検討している。主なものは,水量・水質・生態環境を組み入れた流域水環境モデル,侵食・堆積環境と魚類の生息場,ダム下流流程と浮遊有機物動態,地表面条件とそれが積雲・降雨に及ぼす影響,地球温暖化と流域水資源環境への影響評価,である。In this fiscal year (FY2005), some modules to be added to Hydro-BEAM and some aspects of evaluation have been discussed. Following items are the main topics and included in this report. 1) Regional water circulation processes with water quantity, quality, and ecosystem 2) Difference in habitat preference of Rhinogobius flumineus among erosional and depositional reaches 3) Variation in drift distance of suspended POM in relation to flow regimes and channel geomorphology 4) Effect of land surface condition on convective precipitation over the mountainous region in Lake Biwa during the summer season 5) Impact assessment on water resources environment in river basin due to global warmin

    編集後記

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    Data Science View, Shiga University, Vol.3 [53]articl

    A Two-institution study of risk factors for pancreatitis after endoscopic retrograde cholangiopancreatography for transpapillar y biliar y stent placement in patients with malignant biliary obstruction

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    【目的】悪性胆道狭窄に対する内視鏡的胆管ステント留置におけるERCP後膵炎の危険因子を明らかにする.【対象と方法】対象は2005年4月から2011年8月の間に埼玉医科大学総合医療センター及び上尾中央総合病院にて悪性胆道狭窄に対しERCP下に内視鏡的胆管ステント留置した100例.Self expandable metallic stent(SEMS)を留置した67例をSEMS groupとしPlastic stent(PS)を留置した33例をPS groupとした.ERCP後膵炎に寄与する危険因子を検討した.【結果】全症例のERCP後膵炎の発症率は3.0%でありSEMS groupは7.1%,PS groupは2.3%であり両群に差を認めなかった.膵癌患者のステントの開存期間中央値はSEMS group(8 mm)は136日,SEMS group(10 mm)は140日,PS groupは79日であった.膵癌以外の患者のステントの開存期間中央値はSEMS group(8 mm)は126日,SEMS group(10 mm)は166日,PS groupは137日であった.ERCP後膵炎に寄与する因子として膵癌か否か,主膵管の閉塞の有無,ステント留置前のESTの有無,PSかMS,MSにおけるcoverかuncover,SEMSの径が8 mmか 10 mmの6因子にて多変量解析したところいずれも寄与しなかった.【結論】悪性胆道狭窄に対する内視鏡的胆管ステント留置においてステントの種類や径,ステント留置前のESTの有無はERCP後膵炎に寄与しない.【Objective】To evaluate the risk factors for pancreatitis following endoscopic retrograde cholangiopancreatography (ERCP) for biliary stent placement in patients with malignant biliary obstruction (MBO).【Methods】This retrospective study included consecutive MBO patients who underwent ERCP-guided transpapillary biliary stent placement over a period of 5.5 years at two tertiary referral academic medical centers. Of 100 eligible patients identified, 67 received a WallflexTM self-expandable metallic stent (Boston Scientific Cooperation, Japan; SEMS group) and 33 received a FleximaTM plastic stent (Boston Scientific; PS group). The etiology of MBO was similar between the two groups, with pancreatic cancer accounting for 53% cases. The main outcome measurements were identifiable risk factors for post-ERCP pancreatitis (PEP).【Results】The overall PEP rate was 3.0%, with no significant difference between the SEMS and PS groups. Totally, 7.1% and 2.3% patients who did and did not undergo endoscopic sphincterotomy (EST) before biliary stenting, respectively, developed PEP. The median duration of stent patency in the 8-mm SEMS, 10-mm SEMS, and PS groups was 136, 140, and 79 days, respectively, for patients with pancreatic cancer and in the 8-mm SEMS, 10-mm SEMS, and PS groups was 126, 166, and 137 days, respectively, for patients without pancreatic cancer. Multivariate analysis identified 6 factors that were not associated with PEP. PEP rates according to the presence or absence of EST before stent placement, stent type, stent size, and indications were not significantly different.【Conclusion】The characteristics of the biliary stent and the performance of EST before stent placement are not significant risk factors for PEP in patients with MBO who underwent transpapillary biliary stent placement
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