Journal of Engineering Research

Customers' behaviors such as tendencies, loyalty status, satisfaction criteria show an alteration day by day due to the changing world. So, these behavior changes should be analyzed very well in every step of the decision-making process. Customer churn analysis is the determination of customers who tend to leave by analyzing the customer data with various methods before this situation occurs. Cus…

In recent years, electronic devices such as uninterruptible power supplies, motor drivers, alternating current (AC) voltage regulators with rectifiers, and energy supplied from the electrical network grid are widely used. These devices, which draw AC current from the electrical network, cause non-linear voltage drops in the supply line due to their structural features. In such a case, if no actio…

Using multi-level inverters in converting direct current to alternating current is one of the most demanded and used methods. It is one of the techniques that can be used to create the first level voltage ground by setting the PWM operating times at the zero point grossing from the positive and negative cycles to the gate while creating a multi-level voltage with inverters. In this case, it affec…

The aim of this study is to develop a novel decision support system, which has never been developed yet, in order to optimize machining parameters. We combine the three distinct methods: experimental design and analysis, fuzzy data envelopment analysis (DEA) and fuzzy analytical hierarchy process (AHP). Firstly, a full factorial experiment including four factors and three levels is carried out. W…

With a volume of 2 billion+ trades per day and a market capitalization of 2.56 trillion USD the national stock exchange (NSE), India is one of the largest stock exchanges in the world. Every day the value of stocks, commodities, bonds and futures fluctuate inducing volatility and forecasting these fluctuations to make money requires deep knowledge about the market and their historical data. Thus,…

This paper deals with a multi-period technician routing and scheduling problem. The problem carries out the tasks at various locations by being divided into teams considering differently skilled technicians. This paper provides a bi-objective mixed integer programming method to model the problem since the goals of the performed model are to optimize the travel cost while simultaneously minimizing…

This article described the investigation of the failed superheater tube made of SA210 Grade C used in a biomass power plant. Visual inspection, microstructural examination, chemical analysis and hardness measurement were employed to analyze the causes of the superheater tube failure. Results from the investigation showed that the major cause of this failure was mainly related to the long-term ove…

Wireless Power Transfer (WPT) applications have been used to provide an efficient energy transfer. With the developing technology, WPT has started to be applied in many areas such as mobile phone charging, electric vehicle charging, lighting and control. The magnetic resonance method is highly preferred for WPT, especially at distances where the air gap is short, due to its features such as high …

Incoloy Alloy 800 is utilized in the Outlet manifold bottom header (OMBH) inside the primary reformer at a fertilizer plant. OMBH was serviced at high temperatures and pressures for ten years in this work. Solution annealing and normalizing method were conducted to improve weldability Incoloy alloy 800. The analysis was carried out by the series of tests, including dye penetrant testing, XRF test…

The development of modern electronic systems and increasing number of application areas (computers, office equipment, rectifiers, converters, speed control devices, uninterruptible power supplies, switched power supplies) has led to harmonic generation and reduced energy efficiency. The majority of loads are inductive in nature and the draw of reactive power has increased in networks and transmis…

Distributed energy sources are playing a vital role in providing solutions for long term energy needs. Power quality problems become a major concern in grid connected hybrid energy system (HES). The harmonics introduced by the distributed energy systems may lead to output voltage distortion in grid connected system. Hence, it requires an intelligent control scheme for improving the power quality.…

Risk assessment in manufacturing, construction or service systems are very important tools for ensuring occupational health and safety. Many risk assessment approaches have been proposed in the literature, each with its advantages and disadvantages. In the literature, the authors attempt to develop methods to overcome some of these disadvantages. Different risk priority orders can be obtained for…

Natural Gas (NG) and Liquefied Natural Gas (LNG) are environmentally friendly and price-competitive energy resources that can be used in every part of the world. In this study, we develop a mixed-integer programming model for the NG and LNG supply chain that includes the location of liquefaction plants, regasification units, storage facilities, and distribution hubs together with the routing of th…

The exposed cohesive soils to temperature can face physical and mechanical characteristics changes considerably. Therefore, understanding the environmental events influences on the soil geotechnical properties is essential, which is significant in the rainy and cold places such as in Sulaimani city, north of Iraq. For that reason, and due to the common role of lime on cohesive soil stabilization,…

The triangular membership function evaluates each element of a fuzzy set to both discrete and continuous values, and regressions analysis estimates the relationship between values.  The municipal solid waste compost consists of elements with varied composition including light and heavy metal elements. For MSW compost to acts as a soil conditioner, validation of elements is obligatory. In this pap…

In this article, an integer mathematical programming model for the design problem of flexible cellular manufacturing systems is proposed. The objective function of the developed mathematical programming model is to minimize the total design cost, including the costs of operating parts on machines, using tools on machines, and assigning employees to cells; this model also incorporates the present …

With increasing current healthcare attention, medical e-records have gained vital importance. Medical practical centers such as hospitals and clinics perform common treatments to patients, consequently generating humongous health data to be recorded, needing to be trustfully shared instantaneously between intended specialists for proper diagnosis and treatment. All sensitive e-records need data p…

Shingle is a roofing material with fiber glass carrier, covered with mineral stones in various colors and shaped in decorative patterns. Shingle material can appear as an excess usage due to defective production problems or at the end of their service life. Therefore, the evaluation of these material in different areas is important for a sustainable production process. In this study, the utilizat…

Substantial growth in emissions, hike in fuel prices and exhaustion of fossil fuels have given rise to the need for substitute fuels for diesel engines, which are renewable and demote the emission. Also, strict international emission standards force researchers to seek alternative fuels. Vegetable oils are promising alternative biodiesel for a diesel engine, amongst them, rice bran is underutiliz…

Liquefaction is a major concern, especially in loose soil subjected to vibrations, which may lead to severe damage to buildings and infrastructure. In this paper, the influence of vertical vibrational loading on the liquefaction potential of natural sabkha soil was numerically examined to understand the effects of different parameters, on liquefaction potential. The parameters considered in this …