Thomas Repantis

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In this paper we propose adaptive content-driven routing and data dissemination algorithms for intelligently routing search queries in a peer-to-peer network that supports mobile users. In our mechanism nodes build content synopses of their data and adaptively disseminate them to the most appropriate nodes. Based on the content synopses, a routing mechanism(More)
BACKGROUND Authors of recent studies have reported early periprosthetic osteolysis in patients who have been treated with a contemporary metal-on-metal total hip arthroplasty and have suggested that metal hypersensitivity associated with an immunologic response to metal may be of etiologic importance. We evaluated the results and histologic findings in(More)
Delayed complications following lumbar spine fusion may occur amongst which is adjacent segment degeneration (ASD). Although interspinous implants have been successfully used in spinal stenosis to authors’ knowledge such implants have not been previously used to reduce ASD in instrumented lumbar fusion. This prospective controlled study was designed to(More)
STUDY DESIGN Prospective consecutive series. OBJECTIVE To evaluate the outcomes of the treatment of acute thoracolumbar burst fractures by transpedicular balloon kyphoplasty with calcium phosphate cement and posterior instrumented fusion. SUMMARY OF BACKGROUND DATA In the surgical treatment of thoracolumbar fractures, the major problem after posterior(More)
STUDY DESIGN Prospective controlled cohort study of 27 adult osteoporotic patients who underwent kyphoplasty for fresh osteoporotic spinal fractures. OBJECTIVES To define the evolution of vertebral bone mineral density (BMD) at kyphoplasty and adjacent levels along with sagittal spinal alignment to contribute to the etiology of adjacent vertebral(More)
Many emerging on-line data analysis applications require applying continuous query operations such as correlation, aggregation, and filtering to data streams in real-time. Distributed stream processing systems allow in-network stream processing to achieve better scalability and quality-of-service (QoS) provision. In this paper we present Synergy, a(More)
Service overlays that support distributed stream processing applications are increasingly being deployed in wide-area environments. The inherent heterogeneous, dynamic and large-scale nature of these systems makes it difficult to meet the quality of service (QoS) requirements of the distributed stream processing applications. In this paper we address the(More)
A significant number of emerging on-line data analysis applications require the processing of data streams, large amounts of data that get updated continuously, to generate outputs of interest or to identify meaningful events. Example domains include network traffic management, stock price monitoring, customized e-commerce websites, and analysis of sensor(More)
We describe the design of, and experience with, Query, a monitoring system that supports the Akamai EdgePlatform. Query is a foundation of Akamai's approach to administering its distributed computing platform, allowing administrators, operations staff, developers, customers, and automated systems near real-time access to data about activity in Akamai's(More)
STUDY DESIGN Single institution, single surgeon retrospective review. OBJECTIVE To investigate if the use of titanium mesh cage on the site of infection could be beneficial for successful outcome of the operative treatment for pyogenic spondylitis. SUMMARY OF BACKGROUND DATA There is a controversy concerning the optimal treatment for pyogenic(More)