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Data cleansing approaches have usually focused on detecting and fixing errors with little attention to scaling to big datasets. This presents a serious impediment since data cleansing often involves costly computations such as enumerating pairs of tuples, handling inequality joins, and dealing with user-defined functions. In this paper, we present(More)
BACKGROUND As the current standard treatment for symptomatic cervical disc disease, anterior cervical decompression and fusion may result in progressive degeneration or disease of the adjacent segments. Cervical disc arthroplasty was theoretically designed to be an ideal substitute for fusion by preserving motion at the operative level and delaying adjacent(More)
The purpose of this study was to assess the outcomes of treatment of femoral head osteonecrosis using free vascularised fibular grafting in patients with Hodgkin’s disease and non-Hodgkin’s lymphoma. We retrospectively reviewed seven patients (14 hips) with lymphoma who underwent free vascularised fibular grafting for osteonecrosis of the femoral head,(More)
PURPOSE Although many total hip bearing implants are widely used all over the world, simultaneous comparisons across the numerous available bearing surfaces are rare. The purpose of this study was to compare the survivorship of total hip arthroplasty (THA) with six available bearing implants. METHODS We conducted a systematic review of randomized(More)
We present NADEEF, an extensible, generic and easy-to-deploy data cleaning system. NADEEF distinguishes between a programming interface and a core to achieve generality and extensibility. The programming interface allows users to specify data quality rules by writing code that implements predefined classes. These classes uniformly define what is wrong with(More)
Passive optical networks are a prominent broadband access solution to tackle the "last mile" bottleneck in telecommunications infrastructure. Data transmission over standardized PONs is divided into time slots. Toward the end of PON performance improvement, a critical issue relies on resource management in the upstream transmission from multiple optical(More)
Entity resolution (ER), the process of identifying and eventually merging records that refer to the same real-world entities , is an important and long-standing problem. We present Nadeef/Er, a generic and interactive entity resolution system , which is built as an extension over our open-source generalized data cleaning system Nadeef. Nadeef/Er provides a(More)
transmission efficiency have been investigated in an ad hoc manner. In this paper, we establish a general state space model to analyze the stability of the NLPDBA schemes from the TDM-PON system's point of view, and propose controller design guidelines to maintain the system stability under different scenarios. We prove that a TDM-PON system with NLPDBA is(More)