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This paper describes an approach for automatically classifying visitors of a web site according to their access patterns. User access logs are examined to discover clusters of users that exhibit similar information needs; e.g., users that access similar pages. This may result in a better understanding of how users visit the site, and lead to an improved(More)
We present RIFFA 2.1, a reusable integration framework for Field-Programmable Gate Array (FPGA) accelerators. RIFFA provides communication and synchronization for FPGA accelerated applications using simple interfaces for hardware and software. Our goal is to expand the use of FPGAs as an acceleration platform by releasing, as open source, a framework that(More)
We present RIFFA, a reusable integration framework for FPGA accelerators. RIFFA provides communication and synchronization for FPGA accelerated software using a standard interface. Our goal is to expand the use of FPGAs as an acceleration platform by releasing, as open source, a no cost framework that easily integrates software on traditional CPUs with FPGA(More)
Transmission to new hosts is a fundamental challenge for parasites. Some species meet this challenge by hitchhiking on other, more mobile parasite species, a behaviour known as phoresis. For example, feather-feeding lice that parasitise birds disperse to new hosts by hitchhiking on parasitic louse flies, which fly between individual birds. Oddly, however,(More)
Proton NMR spectroscopy of urine has previously been used to gain insight into the site and mechanism of toxic injury to the kidney. d-Serine injures the rat kidney, causing selective necrosis of the proximal straight tubules. Damage is accompanied by proteinuria, glucosuria, and amino aciduria, the latter preceding the onset of necrosis. This study has(More)
—Real-time optical mapping technology is a technique that can be used in cardiac disease study and treatment technology development to obtain accurate and comprehensive electrical activity over the entire heart. It provides a dense spatial electro-physiology. Each pixel essentially plays the role of a probe on that location of the heart. However, the high(More)
We have built a system that engages naive users in an audio-visual interaction with a computer in an unconstrained public space. We combine audio source localization techniques with face detection algorithms to detect and track the user throughout a large lobby. The sensors we use are an ad-hoc microphone array and a PTZ camera. To engage the user, the PTZ(More)
  • M Jacobsen
  • 1976
The recommendation of Popper's philosophy of science should be adopted by epidemiologists is disputed. Reference is made to other authors who have shown that the most constructive elements in Popper's ideas have been advocated by earlier philosophers and have been used in epidemiology without abandoning inductive reasoning. It is argued that Popper's(More)
Robust real time tracking of multiple targets is a requisite feature for many applications. Online boosting has become an effective approach for dealing with the variability in object appearance. This approach can adapt its classifier to changes in appearance at the cost of additional runtime computation. In this paper, we address the task of accelerating(More)
—This paper presents an architecture of a low-power real-time object detection processor using Adaboost with Haar-Like features. We employ a register array based architecture, and introduce two architectural-level power optimization techniques ; signal gating domain for integral image extraction, and low-power integral image update. The power efficiency of(More)