Association Rule Mining on Big Data Sets

An accurate, complete, and rapid establishment of customer needs and existence of product recommendations are crucial points in terms of increasing customer satisfaction level in various different sectors such as the banking sector. Due to the significant increase in the number of transactions and customers, analyzing costs regarding time and consumption of memory becomes higher. In order to increase the performance of the product recommendation, we discuss an approach, a sample data creation process, to association rule mining. Thus instead of processing whole population, processing on a sample that represents the population is used to decrease time of analysis and consumption of memory. In this regard, sample composing methods, sample size determination techniques, the tests which measure the similarity between sample and population, and association rules (ARs) derived from the sample were examined. The mutual buying behavior of the customers was found using a well-known association rule mining algorithm. Techniques were compared according to the criteria of complete rule derivation and time consumption

Operational Research: Methods and Applications

Throughout its history, Operational Research has evolved to include a variety of methods, models and algorithms that have been applied to a diverse and wide range of contexts. This encyclopedic article consists of two main sections: methods and applications. The first aims to summarise the up-to-date knowledge and provide an overview of the state-of-the-art methods and key developments in the various subdomains of the field. The second offers a wide-ranging list of areas where Operational Research has been applied. The article is meant to be read in a nonlinear fashion. It should be used as a point of reference or first-port-of-call for a diverse pool of readers: academics, researchers, students, and practitioners. The entries within the methods and applications sections are presented in alphabetical order

Finite element analysis of deep excavation: A case study

World population increases day by day. In order to meet this increasing population’s basic needs such as sheltering, transportation and social activities, necessity for underground structures gradually increase. As a result, deep excavations become more important each passing day while excavations deepen. In order to design the optimum system which ensures the safety of environment, roads, structures and the excavation, the excavation properties should be modelled so that it reflects the actual geometry and boundary conditions. The ground parameters, which have crucial effect on the solution, should also be determined precisely. In this study, a deep excavation with a depth of 33.0 m performed on over-consolidated Ankara Clay is investigated. The excavation system was designed to be consisted of double-row of piles supported by multilevel anchors. Inclinometer and load cell installations on the shoring elements have been made for the inspection of the pile wall displacements and anchor forces. Back analysis is made in order to obtain the ideal ground parameters which give the measured displacements and anchor forces. This analysis is conducted by a series of Plaxis analysis in which ground parameters are changed iteratively in order to find their values that give the measured displacements and forces. For these Plaxis analyses, three different models namely; Hardening Soil, HS small and Mohr Coulomb are used and ground parameters are determined. Finally, ground parameters obtained by back analysis for different soil models and the parameters determined from field tests are compared and a correlation is proposed to simulate the behavior of over consolidated Ankara clay

The Effects of Early Enteral Nutrition Products on the Healing of Colo-Colonic Anastomosis

Objectives. Complications after colorectal surgery have not been reduced in recent years. Anastomotic leakage is responsible for nearly all morbidity in colonic surgery and for about one third of the mortality

The Effects of Early Enteral Nutrition Products on the Healing of Colo-Colonic Anastomosis

Objectives. Complications after colorectal surgery have not been reduced in recent years. Anastomotic leakage is responsible for nearly all morbidity in colonic surgery and for about one third of the mortality

Protective Effect of Alpha Lipoic Acid on Rat Sciatic Nerve Ischemia Reperfusion Damage

Background: Alpha lipoic acid is a potent antioxidant that plays numerous roles in human health. This study examined the effect of ALA on rat sciatic nerve ischemia reperfusion damage

THE PREDICTORS OF MORTALITY IN IPF - DOES EMPHYSEMA CHANGE THE PROGNOSIS?

Background: Combined idiopathic pulmonary fibrosis (IPF) and emphysema (CPFE) has been reported to be more common in male smokers. A number of studies comparing CPFE patients with fibrosis-only patients have reported a similar prognosis while others have reported a significantly shorter survival. Objectives: In present study, we aimed to compare baseline characteristics of patients with IPF according to emphysema presence. We asssessed the prognostic value of emphysema along with each other parameter. Methods: We retrospectively reviewed the clinical, baseline radiological, laboratory and physiological parameters of 92 patients who were diagnosed with IPF. The patients were divided into two groups: those without emphysema (Group 1) and with emphysema (Group 2). All-cause mortality was recorded, and the impact of the variables on survival was evaluated. Results: Emphysema was recorded in 23 patients, all of whom were male. While ever-smoker rate was higher in Group 2 laboratory and physiologic parameters were similar. Radiologically, the presence of honeycombing, ground glass opacity, the extension and symmetry of involvement did not differ between the Groups. The median survival time was 29 +/- 4 months. Patients in Group 1 and 2 had a median survival of 34 and 9 months, respectively. In univariate analysis; radiological presence of emphysema and honeycombing, male gender, lower baseline levels of albumin and oxygen saturation, forced vital capacity and carbon monoxide diffusing capacity were detected as predictors of mortality. Conclusion: In present study, IPF with emphysema was more common in male smokers. When emphysema accompanies IPF, life expectancy is remarkably worse, but not independently so

Developing polymer composite-based leaf spring systems for automotive industry

Aktas, Engin/0000-0002-5706-2101; Oztoprak, Nahit/0000-0003-1132-8768WOS: 000449094200012Composite-based mono-leaf spring systems were designed and manufactured to replace existing mono-leaf metal leaf spring in a light commercial vehicle. In this study, experimentally obtained mechanical properties of different fiber-reinforced polymer materials are presented first, followed by the description of the finite element analytical model created in Abaqus 6.12-1 (Dassault Systemes Simulia Corp., RI, US) using the obtained properties. The results from the finite element analysis are presented next and compared with actual size experimental tests conducted on manufactured prototypes. The results demonstrated that the reinforcement type and orientation dramatically influenced the spring rate. The prototypes showed significant weight reduction of about 80% with improved mechanical properties. The hybrid composite systems can be utilized for composite-based leaf springs with considerable mechanical performance