2,295 research outputs found
Declarative Entity Resolution Via Matching Dependencies and Combining Matching Dependencies With Machine Learning for Entity Resolution
No full textEntity resolution (ER) is an important problem in data cleaning. It is about iden- tifying and merging records in a database that represent the same external entity. Relatively recently, declarative rules called matching dependencies (MDs) have been proposed for specifying similarity conditions under which attribute values in database records are merged. An ER process supported by MDs over a dirty instance may lead to multiple clean instances.In this thesis, we first present disjunctive answer set programs that capture through their models the class of alternative clean instances obtained after an ER process based on MDs. With these programs, we can obtain clean answers to queries by skeptically reasoning from the program. As an important practical case of ER, we provide a declarative reconstruction of the so-called union-case ER methodology, as presented through a generic approach to ER, the so-called Swoosh approach. We extend our ASP-based account of the union-case of Swoosh with negative rules.In this work, we extend MDs to relational MDs, which capture more application semantics, and identify classes of relational MDs for which the proposed declarative specifications for ER via MDs can be automatically rewritten into stratified Datalog programs.We also show the process and the benefits of integrating four components of ER: (a) Building a classifier for duplicate/non-duplicate record pairs using machine learn- ing (ML) techniques; (b) Use of relational MDs for supporting the blocking phase of ML; (c) Record merging on the basis of the classifier results; and (d) The use of the declarative language LogiQL -an extended form of Datalog supported by the LogicBlox platform- for all activities related to data processing, and the specification and enforcement of MDs
Unemployment Rates: Where Savannah Stands
No full textExcerpt: Both Savannah and Statesboro have experienced job growth, strong construction activity, increased residential growth and commercial development. Author\u27s biography: Sahar Bahmani is an assistant professor of economics. She can be reached at [email protected]
Investigation of fracture toughness for a polycrystalline graphite under combined tensile-tear deformation
No full textIn the present contribution, mixed mode I/III fracture toughness of a polycrystalline graphite is studied experimentally, numerically and theoretically using a new designed test specimen. A simple disc shape specimen subjected to three-point bending named herein edge notched disc bend (ENDB), is successfully employed for fracture toughness experiments on graphite. This specimen can introduce full combination of modes I and III including pure mode I, pure mode III and complete intermediate mode mixities. Fracture toughness values (KIc and KIIIc) of investigated graphite are obtained for six different mode mixities for and the obtained experimental data are compared with theoretical predictions of two conventional mixed mode I/III fracture theories namely: maximum tangential stress (MTS) and maximum tangential strain energy density (MTSED). It has been observed that the fracture toughness results are in good agreement with the mixed mode I/III curve of MTSED criterion. Consequently, the suggested ENDB specimen can be proposed as a suitable specimen for mixed mode I/III fracture toughness study of based on graphite materials. © 2017 Elsevier Lt
Mixed mode I/II fracture investigation of Perspex based on the averaged strain energy density criterion
No full textIn this work, some recent mixed mode I/II fracture toughness results obtained from Perspex (or polymethylmethacrylate (PMMA)) with four simple cracked specimens subjected to the conventional three-point bend loading are reanalysed based on local energy concept. Although all the mentioned samples have been tested under the same and similar mode mixities, different fracture toughness envelopes were obtained for mixed mode I/II fracture of PMMA. The averaged strain energy density (SED) criterion has been applied in the past for different types of notched specimens (including U, V, O and keyhole notches). It is shown that the mixed mode tensile-in plane shear fracture toughness data obtained from the semicircular and triangular crack type specimens are successfully predicted for sharp cracked PMMA samples using the SED criterion. © 2017, Pleiades Publishing, Ltd
A Novel Method Based on a Non-Stationary Discrete Markov Chain for Tracking Variations in the Quantity of Reserved Energy and the Number of Electric Vehicles
No full textSince the initial suggestion that electrically propelled vehicles could be used on the grid-side, numerous significant investigations have been conducted to showcase the capabilities of these technologies, which have proven to be highly advantageous. Nevertheless, there are still many uncertainties surrounding the integration of electric vehicles into the power grid, which is why it has been likened to a black box. These uncertainties include the number of electric vehicles that will be connected to the grid at any given time, the amount of energy that will be stored in their batteries during both the daytime and overnight, and the impact that their charging profiles will have on the overall load placed on the power system. In addition, there are several unanswered questions that need to be addressed. This article presents a novel model that effectively addresses these uncertainties. It is based on a non-stationary Markov chain, and it was introduced in this paper. The findings of the model provide fascinating insights into the number of electric vehicles connected to the grid and the amount of energy saved over the course of a day, as demonstrated by a case study. In addition, this article analyzes and evaluates the ability of the model to accurately represent the load modeling of electric vehicle charging
FIG. 2 in Annotated checklist of the endemic Tetrapoda species of Iran
No full textFIG. 2. — Rana pseudodalmatina Eiselt & Schmidtler, 1971. Photo by M. Najibzadeh.Published as part of Eskandarzadeh, Naeimeh, Rastegar-Pouyani, Nasrullah, Rastegar-Pouyani, Eskandar, Fathinia, Behzad, Bahmani, Zahed, Hamidi, Kordiyeh & Gholamifard, Ali, 2018, Annotated checklist of the endemic Tetrapoda species of Iran, pp. 507-537 in Zoosystema 40 (24) on page 511, DOI: 10.5252/zoosystema2018v40a24, http://zenodo.org/record/433679
FIG. 8 in Annotated checklist of the endemic Tetrapoda species of Iran
No full textFIG. 8. — Podoces pleskei Zarudny, 1896. Photo by M. Ghorbani.Published as part of Eskandarzadeh, Naeimeh, Rastegar-Pouyani, Nasrullah, Rastegar-Pouyani, Eskandar, Fathinia, Behzad, Bahmani, Zahed, Hamidi, Kordiyeh & Gholamifard, Ali, 2018, Annotated checklist of the endemic Tetrapoda species of Iran, pp. 507-537 in Zoosystema 40 (24) on page 527, DOI: 10.5252/zoosystema2018v40a24, http://zenodo.org/record/433679
FIG. 1 in Annotated checklist of the endemic Tetrapoda species of Iran
No full textFIG. 1. — Bufotes luristanicus (Schmidt, 1952). Photo by M. Najibzadeh.Published as part of Eskandarzadeh, Naeimeh, Rastegar-Pouyani, Nasrullah, Rastegar-Pouyani, Eskandar, Fathinia, Behzad, Bahmani, Zahed, Hamidi, Kordiyeh & Gholamifard, Ali, 2018, Annotated checklist of the endemic Tetrapoda species of Iran, pp. 507-537 in Zoosystema 40 (24) on page 509, DOI: 10.5252/zoosystema2018v40a24, http://zenodo.org/record/433679
Fracture assessment of polymethyl methacrylate using sharp notched disc bend specimens under mixed mode I + III loading
No full textMixed mode I/III behavior of Perspex (polymethyl methacrylate (PMMA)) is studied experimentally and theoretically in this research using a new and simple laboratory test configuration. The specimen is a circular disc containing a sharp V-notch along the diameter that is loaded by the conventional three-point bend fixture. The critical values of notch stress intensity factors (KI V and KIII V) were obtained for the whole combinations of modes I and III simply by changing the notch inclination angle relative to the loading rollers. The value of notch fracture toughness under pure or dominantly tension loads was greater than its corresponding value under mode III or dominantly torsion loads. The experimental results were also predicted very well by employing the local strain energy density (SED) criterion. © 2016, Pleiades Publishing, Ltd
Fracture assessment of polymethyl methacrylate using sharp notched disc bend specimens under mixed mode I + III loading
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