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一种新的磁盘调度策略:D(0.2,S,d)
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作者 陈尹立 欧阳星明 《华中理工大学学报》 CSCD 北大核心 1995年第5期20-24,共5页
提出了一种新的调度策略D(0.2,S,d).其基本思想是根据请求访问磁盘的申请在磁盘瞬时不均匀分布情况下而进行有选择优先服务的策略,核心是增加磁头向磁盘上申请访问密集处移动倾向的一种调度原则.模拟出各种情形,然后用新... 提出了一种新的调度策略D(0.2,S,d).其基本思想是根据请求访问磁盘的申请在磁盘瞬时不均匀分布情况下而进行有选择优先服务的策略,核心是增加磁头向磁盘上申请访问密集处移动倾向的一种调度原则.模拟出各种情形,然后用新旧调度算法调度,比较其调度效果.同时,测定新调度算法中两个调节参数S和d所处的最佳位置,达到了最佳调度效果:平均等待时间最短和平均响应方差最小. 展开更多
关键词 可移动头磁盘 调度 磁盘申请密度 扫描倾向
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Asymptomatic pancreatic lesions: New insights and clinical implications
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作者 Martin Loos Christoph W Michalski Jrg Kleeff 《World Journal of Gastroenterology》 SCIE CAS CSCD 2012年第33期4474-4477,共4页
Despite great efforts in experimental and clinical research, the prognosis of pancreatic cancer (PC) has not changed significantly for decades. Detection of pre-invasive lesions or early-stage PC with small resectable... Despite great efforts in experimental and clinical research, the prognosis of pancreatic cancer (PC) has not changed significantly for decades. Detection of pre-invasive lesions or early-stage PC with small resectable cancers in asymptomatic individuals remains one of the most promising approaches to substantially improve the overall outcome of PC. Therefore, screening programs have been proposed to identify curable lesions especially in individuals with a familial or genetic predisposition for PC. In this regard, Canto et al recently contributed an important article comparing computed tomography, magnetic resonance imaging, and endoscopic ultrasound for the screening of 216 asymptomatic high-risk individuals (HRI). Pancreatic lesions were detected in 92 of 216 asymptomatic HRI (42.6%). The high diagnostic yield in this study raises several questions that need to be answered of which two will be discussed in detail in this commentary: First: which imaging test should be performed? Second and most importantly: what are we doing with incidentally detected pancreatic lesions? Which ones can be observed and which ones need to be resected? 展开更多
关键词 Pancreatic cancer Early-stage pancreatic cancer Asymptomatic high-risk individuals Preinvasive pancreatic lesions Cystic pancreatic tumors Screening Computed tomography Magnetic resonance imaging Endoscopic ultrasound
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