BACKGROUND AND PURPOSE Sleep-related breathing disorders occur frequently after stroke. We assessed the feasibility of continuous positive airway pressure (CPAP) treatment initiated in the first night after stroke. METHODS In this open-label, parallel-group trial, 50 patients were randomly assigned to the CPAP therapy or to the control group. All patients underwent polysomnography in the four...

Automated performance tuning of data management systems offer various benefits such as improved performance, declined administration costs, and reduced workloads to database administrators (DBAs). Currently, DBAs tune the performance of database systems with a little help from the database servers. In this paper, we propose a new technique for automated performance tuning of data management sys...

Server virtualization is accelerating the already existing need for shared storage area network (SAN) infrastructure for the associated benefits of migration, flexible management and economies of sharing. Understanding the characteristics of a workload in terms of access locality, IO sizes, read write ratio etc. is crucial for effective placement and consolidation. The lack of visibility into w...

To cope with the increasing number and size of XML documents, XML databases provide index structures to accelerate queries on the content and structure of documents. To adapt indices to the query workload, XML databases require various secondary index structures. This paper presents a generic index framework called sciens (Structure and Content Indexing with Extensible, Nestable Structures). In...

In this paper we describe novel techniques that make it possible to build an industrial-strength tool for automating the choice of indexes in the physical design of a SQL database. The tool takes as input a workload of SQL queries, and suggests a set of suitable indexes. We ensure that the indexes chosen are effective in reducing the cost of the workload by keeping the index selection tool and ...

BACKGROUND Clinical information systems in the National Health Service do not need to conform to any explicit usability requirements. Poor usability can increase the mental workload experienced by clinicians and cause fatigue, increase error rates and impact the overall patient safety. Mental workload can be used as a measure of usability. OBJECTIVE To assess the subjective cognitive workload...

background: coronary angiography, albeit a safe procedure, may cause serious complications especially in patients with left main stenosis (lms). this study was designed to investigate the efficacy of workload achieved by exercise tolerance test (ett) in predicting lms in candidates for coronary angiography. methods: a total of 743 patients with a positive ett who subsequently underwent cardiac ...