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A Two-Level Approach based on Integration of Bagging and Voting for Outlier Detection

Journal of Data and Information Science 2020年第2期5卷 111-135页

作者： alican dogan Derya Birant The Graduate School of Natural and Applied Sciences Dokuz Eylul UniversityIzmirTurkey Department of Computer Engineering Dokuz Eylul UniversityIzmirTurkey

Purpose:The main aim of this study is to build a robust novel approach that is able to detect outliers in the datasets *** serve this purpose,a novel approach is introduced to determine the likelihood of an object to be extremely different from the general behavior of the entire ***/methodology/approach:This paper proposes a novel two-level approach based on the integration of bagging and voting techniques for anomaly detection *** proposed approach,named Bagged and Voted Local Outlier Detection(BV-LOF),benefits from the Local Outlier Factor(LOF)as the base algorithm and improves its detection rate by using ensemble ***:Several experiments have been performed on ten benchmark outlier detection datasets to demonstrate the effectiveness of the BV-LOF *** to the results,the BV-LOF approach significantly outperformed LOF on 9 datasets of 10 ones on *** limitations:In the BV-LOF approach,the base algorithm is applied to each subset data multiple times with different neighborhood sizes(k)in each case and with different ensemble sizes(T).In our study,we have chosen k and T value ranges as[1-100];however,these ranges can be changed according to the dataset handled and to the problem *** implications:The proposed method can be applied to the datasets from different domains(***,finance,manufacturing,etc.)without requiring any prior *** the BV-LOF method includes two-level ensemble operations,it may lead to more computational time than single-level ensemble methods;however,this drawback can be overcome by parallelization and by using a proper data structure such as R*-tree or ***/value:The proposed approach(BV-LOF)investigates multiple neighborhood sizes(k),which provides findings of instances with different local densities,and in this way,it provides more likelihood of outlier detection that LOF may *** also brings many benefits such as easy impleme

关键词： Outlier detection Local outlier factor Ensemble learning Bagging Voting

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Streamlined CFD simulation framework to generate wind-pressure coefficients on building facades for airflow network simulations

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Building Simulation 2021年第4期14卷 1189-1200页

作者： Timur dogan Patrick Kastner Cornell University Department of ArchitectureEnvironmental Systems LaboratoryEast Sibley HallIthacaNY14850USA

Building energy modeling software generally comes with capable airflow network solvers for natural ventilation evaluation in multi-zone building energy models. These approaches rely on arrays of pressure coefficients representing different wind directions derived from simple box-shaped buildings without contextual obstructions. For urban or obstructed sites, or more complex building shapes, however, further evaluation is needed to avoid geometric oversimplification. In this study, we present an automated and easy-to-use simulation workflow for OpenFOAM-based exterior airflow simulations to generate arrays of pressure coefficients for arbitrary building shapes and contextual situations. The workflow is compared to other methods commonly used to obtain pressure coefficients for natural ventilation analysis. Finally, we assess for which climate zones and building types modelers should rely on more accurate CFD-based pressure coefficients and where it may be justifiable to rely on easier and readily available analytical approaches to determine pressure coefficients. Results suggest that existing workflows lead to significant error in predicted comfort hours for climates in the Global South and modelers should consider CFD-based facade pressure coeficients.

关键词： natural ventilation airflow networks EnergyPlus pressure coefficients computational fluid dynamics

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Comparative New Insight into the Tectonic Origin of Folds and Thrust Faults of an Extensional Basin: Soke-Kusadasi Basin, Aegean, Western Turkey

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Journal of Earth Science 2020年第3期31卷 582-595页

作者： Bulent dogan Department of Geological Engineering Engineering FacultyUniversity of KocaeliUmuttepe CampusIzmit-Kocaeli 41001Turkey

The Aegean area of the western Anatolian region of Turkey,controlled by the low-angle detachment normal fault system,forms an extensional province,the West Anatolian Extensional Province(WAEP).The tectonic deformation which occurred in the Miocene Period,including the Plio–Quaternary Period has created different structures in both the basement rocks and intra-basin deposits of the *** of these structures,high-angle normal faults,controls the supradetachment Soke-Kusadasi Basin(SKB).Within this basin,there are folds with different axes and thrust faults with a north-northwestnortheast(N,NW,NE)*** folds and thrust faults in the SKB deformed the sedimentary structures of intra-basin *** folds and thrust faults,which caused the rotation of beddings and imbrications in the SKB,are mainly associated with the tectonic process of the low angle detachment normal fault,which affected the SKB and the Aegean part of western *** the SKB,during the process of extensional deformation associated with primary low angle detachment normal faulting,the ramp-flat and inversion geometry observed in the basement rocks and basin deposits of the crust caused folds and thrust faults in only intra-basin *** the WAEP,it is determined for the first time that the folds and thrust faults causing limited shortening deformed the Plio–Quaternary sediments.

关键词： low angle detachment normal fault high angle normal fault fold thrust fault bedding extensional supradetachment basin

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Axial gas mixing in conical spouted beds with high density particles

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Particuology 2023年第10期81卷 45-57页

作者： Neslin dogan Murat Koksal Gorkem Kulah Department of Chemical Engineering Middle East Technical UniversityAnkaraTurkey Department of Mechanical Engineering Hacettepe UniversityBeytepeAnkaraTurkey

Conical spouted beds operating with high-density particles(ρp>2500 kg/m^(3))have recently gained attention because of their potential use as nuclear fuel coaters for next-generation nuclear *** the literature,the number of axial gas mixing studies in conical and conical-cylindrical spouted beds is very limited and all axial mixing studies were carried out with relatively light particles(ρp≤2500 kg/m^(3)).Therefore,the objective of this study was to generate experimental data that can be used to explain the gas axial mixing behavior in conical spouted beds operating with both low-and high-density *** were conducted in two(γ=30°,60°)conical spouted beds with three different types of particles:zirconia(ρp=6050 kg/m^(3)),zirconia toughened alumina(ρp=3700 kg/m^(3))and glass beads(ρp=2460 kg/m^(3)).In order to be able to compare experimental data obtained at different conditions,a 1-D convection-diffusion gas mixing model originally developed by San Joséet al.(1995)was implemented to determine the axial dispersion *** results show that the axial dispersion coefficients range between m^(2)/s and m^(2)/s,increase with superficial gas velocity and are higher than the corresponding dispersion coefficients of fixed beds,lower than the dispersion coefficients of fluidized beds and in the same range with the cylindrical spouted beds reported in the *** corresponding Peclet numbers were in the range of 0.6–7.8 for all operating conditions and slightly higher Peclet numbers were obtained with glass beads indicating the relative importance of gas convective transport over gas dispersion for light particles compared to heavy particles.

关键词： Conical spouted bed Gas dispersion coefficient Axial gas mixing High-density particles

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Effect of a semi electro-mechanical engine valve on performance and emissions in a single cylinder spark ignited engine

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第2期11卷 106-114页

作者： Bülent ZDALYAN Oguzhan dogan Department of Automotive Education Karabuk UniversityKarabuk 78050Turkey

In this study, an electro-mechanical valve （EMV） system for the intake valve ofa fottr stroke, single cylinder, overhead valve and spark ignition （SI） engine was designed and constructed. An engine with the EMV system and a standard engine were tested to observe the effects of the EMV on engine performance and emissions at different speeds under full load. The EMV engine showed improved engine power, engine torque and break specific fuel consumption （BSFC）. A 66% decrease in CO emissions was also obtained with the EMV system, but hydrocarbons （HC） and NOx emissions increased by 12% and 13% respectively.

关键词： Semi electro-mechanic Camless engine Electro-mechanic engine valve Engine performance Emissions

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Hepatic fibrosis in biliary-obstructed rats is prevented by Ginkgo biloba treatment

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World Journal of Gastroenterology 2005年第35期11卷 5444-5449页

作者： Gksel pener Levent Kabasakal Meral Yüksel Nursal Gedik Ynci alican Department of Pharmacology Marmara University School of Pharmacy Istanbul Turkey Marmara University Vocational School of Health Related Professions Istanbul Turkey Division of Biochemistry Kas(?)mpasa Military Hospital Istanbul Turkey Department of Physiology School of Medicine Marmara University Istanbul Turkey

AIM： To assess the antioxidant and antifibrotic effects of long-term Ginkgo biloba administration on liver fibrosis induced by biliary obstruction in rats. METHODS： Liver fibrosis was induced in male Wistar albino rats by bile duct ligation and scission （BDL）. Ginkgo biloba extract （EGb 761, 50 mg/*** d） or saline was administered for 28 d. At the end of the treatment period, all rats were killed. Serum aspartate aminotransferase （AST）, alanine aminotransferase （ALT）, and lactate dehydrogenase （LDH） levels were determined to assess liver functions and tissue damage, respectively. Tumor necrosis factor-α （TNF-α） was also assayed in serum samples. Liver tissues were taken for determination of the hepatic malondialdehyde （MDA） and glutathione （GSH） levels, myeloperoxidase （MPO） activity and collagen content. Production of reactive oxidants was monitored by chemiluminescence （CL） assay. Serum AST, ALT, LDH, and TNF-α levels were elevated in the BDL group as compared to control group and were significantly decreased by EGb treatment. RESULTS： Hepatic GSH level, depressed by BDL, was elevated back to control level in EGb-treated BDL group. Increase in tissue MDA level, MPO activity and collagen content due to BDL were also attenuated by EGb treatment. Furthermore, luminol and lucigenin CL values in BDL group increased dramatically compared to control and reduced by EGb treatment. CONCLUSION： Our results suggest that Ginkgo biloba protects the liver from oxidative damage following BDL in rats. This effect possibly involves the inhibition of neutrophil infiltration and lipid peroxidation; thus, restoration of oxidant and antioxidant status in the tissue.

关键词： Ginkgo biloba, Bile duct ligation Hepatic fibrosis Oxidant

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Optical Characterization of Amorphous Hydrogenated Carbon(a-C:H)Thin Films Prepared by Single RF Plasma Method

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Plasma Science and Technology 2015年第6期17卷 488-495页

作者： dogan MANSUROGLU Kadir GOKSEN Sinan BILIKMEN Physics Department Middle East Technical University Physics Department Duzce University

Methane （CH4） plasma was used to produce amorphous hydrogenated carbon （a- C：H） films by a single capacitively coupled radio frequency （RF） powered plasma system. The system consists of two parallel electrodes： the upper electrode is connected to 13.56 MHz RF power and the lower one is connected to the ground. Thin films were deposited on glass slides with different sizes and on silicon wafers. The influence of the plasma species on film characteristics was studied by changing the plasma parameters. The changes of plasma species during the deposition were investigated by optical emission spectroscopy （OES）. The structural and optical properties were analyzed via Fourier transform infrared （FTIR） spectroscopy, X-ray diffraction （XRD） and UV-visible spectroscopy, and the thicknesses of the samples were measured by a profilometer. The sp3/sp2 ratio and the existing H atoms play a significant role in the determination of the chemical properties of thin films in the plasma. The film quality and deposition rate were both increased by raising the power and the flow rate.

关键词： a-C:H thin film plasma deposition methane plasma sp3/sp2 ratio

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The value of prognostic markers for pediatric trauma patients

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World Journal of Emergency Medicine 2023年第6期14卷 448-453页

作者： Cansu Durak Ebru Guney Sahin Yasar Yusuf Can alican Sarisaltik Kubra Boydag Guvenc Department of Pediatric Intensive Care Sancaktepe Sehit Prof.Dr.IlhanVarank Training and Research HospitalHealth Science UniversityIstanbul 34785Turkiye Republic of Turkiye Ministry of Health Cayirova District Health DirectorateKocaeli 41420Turkiye

BACKGROUND: Despite the rapid development of pediatric intensive care medicine, there are still limited data in the literature regarding the follow-up of pediatric trauma patients in pediatric intensive care units(PICUs). In this study, we aim to evaluate our experience with children admitted and followed up with the diagnosis of trauma at our ***: We evaluated the retrospective data of 77 pediatric trauma patients who were admitted to the PICU at Sancaktepe Sehit Prof. Dr. IlhanVarank Training and Research Hospital from August 2020 to December 2022. The demographic data, clinical parameters and laboratory results were recorded. The primary outcome was the mortality in PICU. The performances of markers in predicting mortality were evaluated with receiver operating characteristic(ROC) ***: The median age of the patients was 70(33–157) months, and the median duration of hospitalization in the PICU was 6(2–11) d. Of the 77 patients, 9 died due to trauma(11,1%). Among the clinical parameters, Pediatric Risk of Mortality III(PRISM III) Score, inotrope requirement, extracorporeal treatment requirement, and mechanical ventilator requirement were significantly higher in non-survivors than in survivors. Among the laboratory parameters, procalcitonin(PCT), lactate/albumin ratio(LAR), neutrophil/lymphocyte ratio(NLR), and transfusion requirement were significantly higher in non-survivors than in ***: In pediatric trauma patients, baseline PCT, LAR, and NLR values can be used to identify patients at risk for mortality.

关键词： Critical care Pediatric Lactate Procalcitonin Trauma

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Experimental analysis on the nonlinear behavior of DC barrier discharge plasmas

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Plasma Science and Technology 2017年第1期19卷 44-50页

作者： dogan MANSUROGLU Ilker Umit UZUN-KAYMAK Physics Department CanakkaleOnsekiz Mart University Canakkale 17100 Turkey Physics Department Middle East Technical University Ankara 06800 Turkey

Nonlinear behavior of glow discharge plasmas is experimentally *** glow is generated between a barrier semiconductor electrode,Chromium doped namely Gallium Arsenide（Ga As：Cr）,as a cathode and an Indium–Tin Oxide（ITO） coated glass electrode as an anode,in reverse *** planar nature of electrodes provides symmetry in spatial *** discharge behaves oscillatory in the time domain,with single and sometimes multiperiodicities in plasma current and voltage *** this paper,harmonic frequency generation and transition to chaotic behavior is *** observed current–voltage characteristics of the discharge are discussed in detail.

关键词： DC glow discharges nonlinear behavior digital signal analysis

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Structural and superconducting properties in Y_(0.6)Gd_(0.4)Ba_2(Nb)Cu_3O_(7-y) cuprates doped with niobium

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Journal of Rare Earths 2012年第3期30卷 241-244页

作者： M. Yilmaz O. dogan A. K. Education Faculty Department of Physics Konya University

Polycrystalline YBa2Cu3O7-y （YBCO） and Y0.6Gd0.4Ba2-xNbxCu3O7-y （YGBNCO） compounds with 0≤x≤0.225 were synthesized using standard solid state reaction technique. The structure for all samples was characterized by X-ray difference （XRD） and scanning electron microscopy （SEM）. The transport properties were measured by the （FPP） method in the temperature range from 70 to 130 K. As the Nb content in the samples increased, a diffused phase indicating a niobium perovskite phase and a small amount of unidentified phase appeared. With the increase of Nb content, the superconducting transition temperature Tconset increased slowly with x≤0.125, and then it remained unchanged or slowly decreased with 0.125≤x≤0.225. It could be found that there was a slow decrease of zero-resistance temperature, Tcoffset, with the increase of Nb content. The larger transition width might result from the YBa2NbO6 phase, impurity and unidentified phases of the sample due to the Nb doping.

关键词： Y0.6Gd0.4Ba2Cu3O7-y cuprates Gd and Nb co-doping structural and superconducting properties rare earths

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