Browsing by Publisher "ELSEVIER - DIVISION REED ELSEVIER INDIA PVT LTD"

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    Data-oriented QMOOD model for quality assessment of multi-client software applications
    (ELSEVIER - DIVISION REED ELSEVIER INDIA PVT LTD) Özçevik, Y
    There has been a great effort to evaluate software quality using proper tools and methods against different development environments changing over time. Quality Model for Object Oriented Design (QMOOD) is a verified model used for quality assessment of object-oriented software. The model associates quality metrics gathered from the source code and quality attributes in use to present a quality measurement. However, the model should be revised for recent multi -client software including native client applications, because there is a deficiency of metric gathering tools in such environments. More specifically, it is sometimes not possible to gather all quality properties required by QMOOD in all native development platforms of client applications. Hence, even though different client applications have the same design, the implementation quality cannot be monitored for the quality assurance. Analyzing and simplifying the metric set may alleviate this challenge, and a convenient quality assessment might be achieved. Thus, we propose to change the operational aspect of QMOOD by inserting an additional layer, Data Analytic, to the hierarchical structure of the conventional model. Accordingly, we provide a discussion on a case study including five native client applications. For this purpose, a design quality of one of the client applications is achieved to validate the appropriateness of the design, the data analytic on the metric set are implemented and the proposed data-oriented simplified QMOOD is applied to the other client applications. Finally, it is stated that the proposed approach successfully alleviated the problems in metric gathering for multi -client applications while applying QMOOD.
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    Multiple-classifiers in software quality engineering: Combining predictors to improve software fault prediction ability
    (ELSEVIER - DIVISION REED ELSEVIER INDIA PVT LTD) Yucalar, F; Ozcift, A; Borandag, E; Kilinc, D
    Software development projects require a critical and costly testing phase to investigate efficiency of the resultant product. As the size and complexity of project increases, manual prediction of software defects becomes a time consuming and costly task. An alternative to manual defect prediction is the use of automated predictors to focus on faulty modules and let the software engineer to examine the defective part with more detail. In this aspect, improved fault predictors will always find a software quality application project to be applied on. There are many base predictors tested-designed for this purpose. However, base predictors might be combined with an ensemble strategy to further improve to increase their performance, particularly fault-detection abilities. The aim of this study is to demonstrate fault-prediction performance of ten ensemble predictors compared to baseline predictors empirically. In our experiments, we used 15 software projects from PROMISE repository and we evaluated the fault-detection performance of algorithms in terms of F-measure (FM) and Area under the Receiver Operating Characteristics (ROC) Curve (AUC). The results of experiments demonstrated that ensemble predictors might improve fault detection performance to some extent. (C) 2019 Karabuk University. Publishing services by Elsevier B.V.
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    Mixed convection of ferrofluids in a lid driven cavity with two rotating cylinders
    (ELSEVIER - DIVISION REED ELSEVIER INDIA PVT LTD) Selimefendigil, F; Öztop, HF
    Mixed convection of ferrofluid filled lid driven cavity in the presence of two rotating cylinders were numerically investigated by using the finite element method. The cavity is heated from below, cooled from driven wall and rotating cylinder surfaces and side vertical walls of the cavity are assumed to be adiabatic. A magnetic dipole source is placed below the bottom wall of the cavity. The study is performed for various values of Reynolds numbers (100 <= Re <= 1000), angular rotational speed of the cylinders (-400 <= Omega <= 400), magnetic dipole strengths (0 <= gamma <= 500), angular velocity ratios of the cylinders (0.25 <= Omega(i/) Omega(j) <= 4) and diameter ratios of the cylinders (0.5 <= Di/Dj <= 2). It is observed that flow patterns and thermal transport within the cavity are affected by variation in Reynolds number and magnetic dipole strength. The results of this investigation revealed that cylinder angular velocities, ratio of the angular velocities and diameter ratios have profound effect on heat transfer enhancement within the cavity. Averaged heat transfer enhancements of 181.5 % is achieved for clockwise rotation of the cylinder at Omega = -400 compared to motionless cylinder case. Increasing the angular velocity ratio from Omega(2)/Omega(1) = 0.25 to Omega(2)/Omega(1) = 4 brings about 91.7 % of heat transfer enhancement. (C) 2015 Karabuk University. Production and hosting by Elsevier B.V.
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    Optimization of thermal conductivity and lightweight properties of clay bricks
    (ELSEVIER - DIVISION REED ELSEVIER INDIA PVT LTD) Ozturk, S
    As the demand for energy increases worldwide, the construction industry, one of the most energy-intensive sectors, requires lightweight and high-thermal-performance materials. To address this, a multi-objective opti-mization approach was used in this study to identify the most suitable solutions for producing strength-fired clay bricks with low thermal conductivity. Porous bricks were produced with organic waste additives to illustrate the relationship between compressive strength and thermal conductivity. A 3-factor and 3-stage Box-Behnken experimental design was utilized, with a pore-forming additive ratio (0-10% by weight of pine nut shells), firing temperature (850-1050 degrees C), and firing time (2-6 h) as the variables. The fired bricks' physical, me-chanical, and thermal properties were determined using standard analysis methods. The bricks' compressive strength and thermal conductivity functions were generated using neuro-regression systematics. Multiple targets were defined, including minimizing the thermal conductivity and maximizing the compressive strength of the bricks. The genetic algorithm was employed to identify Pareto-optimal solutions, and the final sets of low thermal conductive-strength brick production were chosen based on these solutions. Two sets were proposed to achieve the lowest thermal conductivity, and the results confirmed the validity and feasibility of the optimization study.
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    Neonatal Cholestasis as Initial Presentation of Portosystemic Shunt: A Case Report
    (ELSEVIER - DIVISION REED ELSEVIER INDIA PVT LTD) Dogan, G; Düzgün, F; Tarhan, S; Appak, YÇ; Kasrga, E
    Congenital intrahepatic portosystemic shunts are rare in children. Portosystemic venous malformations are characterized by extreme clinical variability. We report a full-term 33-day-old male infant presenting with neonatal jaundice. On physical examination, he had generalized icterus and the liver was palpable 3.5 cm below the right costal margin. He had no other symptoms. Laboratory tests showed AST 632 U/L, ALT 198 U/L, total bilirubin 12.1 mg/dL, conjugated bilirubin 10.2 mg/dL, alkaline phosphatase 753 U/L, GGT 47 U/L and glucose 67 U/L. Colour Doppler ultrasonography showed the left portal vein was more dilated than the right portal branch and communication with dilated left hepatic vein. There was no evidence of portal hypertension, heart failure, hepatopulmonary syndrome and encephalopathy during his hospital stay, so he was discharged from the pediatric department and his parents advised to attend monthly follow-up. Congenital portosystemic shunts are rarely observed in the childhood period. 1 Depending on anatomic characteristics they may be intrahepatic or extrahepatic. 2 Intrahepatic portosystemic shunts (PSS) are observed between the portal vein and hepatic vein or vena cava inferior. 3,4 Small shunts may close themselves before the age of 2 years. 5 With the increase in use of imaging methods, diagnosing PSS has become easier, with an increase in the number of cases reported. 6 Neonatal cholestatis is a frequent complication of PSS. 1 We present a case presenting with neonatal cholestasis diagnosed with congenital intrahepatic PSS.
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    Effect of Fe-rich intermetallics on the microstructure and mechanical properties of thixoformed A380 aluminum alloy
    (ELSEVIER - DIVISION REED ELSEVIER INDIA PVT LTD) Irizalp, SG; Saklakoglu, N
    The effect of alpha-Fe and beta-Fe intermetallics concentration and morphology as well as alpha-Al morphology on the microstructure and mechanical properties of thixoformed and gravity cast A380 alloy was reported. The alpha-Al15Si2(Fe,Mn)(3) intermetallic particle was observed polyhedral morphology in thixoforming while it was observed Chinese script morphology in conventional gravity casting. The beta-Al5FeSi particle was solidified in the form of small plate in thixoforming while it was solidified in the form of needle-like in gravity casting at the grain boundaries of alpha-Al. The mechanical properties of the alloys have been enhanced by thixoforming compared with the conventional cast condition. Copyright (C) 2014, Karabuk University. Production and hosting by Elsevier B.V. All rights reserved.