A multi-objective artificial bee colony approach to feature selection using fuzzy mutual information

© 2015 IEEE. Feature selection often involves two conflicting objectives of minimizing the feature subset size and the maximizing the classification accuracy. In this paper, a multi-objective artificial bee colony (MOABC) framework is developed for feature selection in classification, and a new fuzzy mutual information based criterion is proposed to evaluate the relevance of feature subsets. Three new multi-objective feature selection approaches are proposed by integrating MOABC with three filter fitness evaluation criteria, which are mutual information, fuzzy mutual information and the proposed fuzzy mutual information. The proposed multi-objective feature selection approaches are examined by comparing them with three single-objective ABC-based feature selection approaches on six commonly used datasets. The results show that the proposed approaches are able to achieve better performance than the original feature set in terms of the classification accuracy and the number of features. By using the same evaluation criterion, the proposed multi-objective algorithms generally perform better than the single-objective methods, especially in terms of reducing the number of features. Furthermore, the proposed fuzzy mutual information criterion outperforms mutual information and the original fuzzy mutual information in both single-objective and multi-objective manners. This work is the first study on multi-objective ABC for filter feature selection in classification, which shows that multi-objective ABC can be effectively used to address feature selection problems.© 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.</div

Pareto front feature selection based on artificial bee colony optimization

Feature selection has two major conflicting aims, i.e., to maximize the classification performance and to minimize the number of selected features to overcome the curse of dimensionality. To balance their trade-off, feature selection can be handled as a multi-objective problem. In this paper, a feature selection approach is proposed based on a new multi objective artificial bee colony algorithm integrated with non-dominated sorting procedure and genetic operators. Two different implementations of the proposed approach are developed: ABC with binary representation and ABC with continuous representation. Their performance are examined on 12 benchmark datasets and the results are compared with those of linear forward selection, greedy stepwise backward selection, two single objective ABC algorithms and three well-known multi-objective evolutionary computation algorithms. The results show that the proposed approach with the binary representation outperformed the other methods in terms of both the dimensionality reduction and the classification accuracy. (C) 2017 Elsevier Inc. All rights reserved

Tellurium speciation analysis using hydride generation in situ trapping electrothermal atomic absorption spectrometry and ruthenium or palladium modified graphite tubes

Speciation of tellurium can be achieved by making use of different kinetic behaviors of Te(IV) and Te(VI) upon their reaction with sodium borohydride using hydride generation. While Te(IV) can form H2Te, Te(VI) will not form any volatile species during the course of hydride formation and measurement by atomic absorption spectrometry. Quantitative reduction of Te(VI) was achieved through application of a microwave assisted prereduction of Te(VI) in 6.0 mol/L HCl solution. Enhanced sensitivity was achieved by in situ trapping of the generated H2Te species in a previously heated graphite furnace whose surface was modified using Pd or Ru. Overall efficiency for in situ trapping in pyrolytically coated graphite tube surface was found to be 15% when volatile analyte species are trapped for 60 s at 300 degrees C. LOD and LOQ values were calculated as 0.086 ng/mL and 0.29 ng/mL, respectively. Efficiency was increased to 46% and 36% when Pd and Ru surface modifiers were used, respectively. With Ru modified graphite tube 173-fold enhancement was obtained over 180 s trapping period with respect to ETAAS; the tubes could be used for 250 cycles. LOD values were 0.0064 and 0.0022 ng/mL for Pd and Ru treated ETAAS systems, respectively, for 180 s collection of 9.6 mL sample solution

Endosonography and magnetic resonance cholangiopancreatography show similar efficacy in selecting patients for ERCP in mild-moderate acute biliary pancreatitis

WOS: 000311871900023PubMed ID: 23161305Background/aims: We aimed to compare the value of endoscopic ultrasonography and magnetic resonance cholangiopancreatography in identifying the patients with mild-moderate acute biliary pancreatitis who require endoscopic retrograde cholangiopancreatography. Material and Methods: The study was prospectively conducted in a tertiary hospital between June 2006 and October 2009. Ninety-five patients without urgent endoscopic retrograde cholangiopancreatography requirement and with mild-moderate acute biliary pancreatitis were included in the study. Patients whose amylase, C-reactive protein, and bilirubin levels had decreased more than 50% on the fifth day compared to admission levels were randomized to magnetic resonance cholangiopancreatography or endoscopic ultrasonography, and the common bile duct was evaluated. Endoscopic retrograde cholangiopancreatography was performed in patients with stone detected with endoscopic ultrasonography or magnetic resonance cholangiopancreatography. With regard to the presence of common bile duct stone in endoscopic retrograde cholangiopancreatography, endoscopic retrograde cholangiopancreatography performances were classified as therapeutic or diagnostic. Results: Endoscopic retrograde cholangiopancreatography was performed in 16 of the 48 patients (33.3%) in the endoscopic ultrasonography group and in 18 of the 47 patients (38%) in the magnetic resonance cholangiopancreatography group. Therapeutic endoscopic retrograde cholangiopancreatography was performed in 14/16 patients (87%) in the endoscopic ultrasonography group and in 16/18 patients (88%) in the magnetic resonance cholangiopancreatography group. The ratio of total number of endoscopic retrograde cholangiopancreatographis was not significantly lower in the endoscopic ultrasonography (16/48) than in the magnetic resonance cholangiopancreatography (18147) group, and the ratio of therapeutic endoscopic retrograde cholangiopancreatographis (14/16) was not higher in the endoscopic ultrasonography group than in the magnetic resonance cholangiopancreatography group (16/18). Conclusions: The necessity of therapeutic endoscopic retrograde cholangiopancreatography was determined with similar efficacy by endoscopic ultrasonography and magnetic resonance cholangiopancreatography in mild-moderate acute biliary pancreatitis

Use of Percutaneous Aspiration Thrombectomy vs. Anticoagulation Therapy to Treat Acute Iliofemoral Venous Thrombosis: 1-year Follow-up Results of a Randomised, Clinical Trial

The purpose of this study was to compare the efficacy of percutaneous aspiration thrombectomy (PAT) followed by standard anticoagulant therapy, with anticoagulation therapy alone, for the treatment of acute proximal lower extremity deep vein thrombosis