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Showing 625 results for Type of Study: Research

Ag Kaifah Riyard Kiflee, Nornajihah Nadia Hasbullah, Faerozh Madli,
Volume 0, Issue 0 (10-2024)
Abstract

Over the years, the attention given to corporate social responsibility (CSR) and sustainability topics has risen significantly and various new terms have been introduced. This result has lead to a very open and unspecified discussion, especially in the field of economic and business management. The presents of functional CSR and sustainability allow the management to come up with better decisions for the benefit of the whole society. Therefore, it is important to understand the topic of interest and widen the research collaboration to enhance the development of research. This study aims to determine the global research trend in CSR and sustainability areas based on publication numbers, co-authorship, affiliated countries, and co-occurrences of keywords. By using Scopus as the main database, a total of 1582 journal articles published between 2001 and 2022 were extracted. This study conducted an analysis based on RTools and Prisma. Results have shown that the publication of articles in the area of CSR and sustainability has increased dramatically since 2015. More than half of the publications were contributed by USA, followed Italy and Spain.
 
Zahra Taherikhonakdar, Hamed Fazlollahtabar,
Volume 0, Issue 0 (10-2024)
Abstract

These days, industries, individuals and organizations are highly dependent on software. Software plays an important role in our daily life. They use in embedded systems, databases, computers, mobiles etc.  Great demand for ICT cause environmental problem and endanger the future sustainability.  In this case, sustainable development has become a hot research topic in software engineering community. Sustainability as a software quality is a general term. Therefore, there is a chance that software developers mislead about develops sustainable software. Therefore, there are some questions that should be answered to help practitioners to develop sustainable software: how developers could develop green and sustainable software? What requirements should be considered to reach green and sustainable software? Which non-functional requirement has an effect on each sustainability dimension?   In this paper, we selected 20 non-functional requirements out of 60. It was identified the effective non-functional requirements in green and sustainable software development by using Delphi method then via interpretive structural modeling (ISM). The study aimed to pave the way for software eco-labeling and help users to choose the green and sustainable one. Also, provide software developers with guideline to develop green and sustainable software by identifying effective non-functional requirements. This would lead to the sustainable future and green environment.
 
Daniel Atnafu, Shimelis Zewdie Werke,
Volume 0, Issue 0 (10-2024)
Abstract

This study systematically reviews previous research to examine the link between Green Human Resource Management (GHRM) and Green Supply Chain Management (GSCM) practices. The review focuses on studies published between 2016 and 2023 and utilizes the Scopus and Web of Science databases, recognized sources for peer-reviewed journal articles. The year 2016 is selected as starting point due to the reason that the first paper appear in literature in this year. The PRISMA approach was employed to identify relevant studies, resulting in the inclusion of 30 studies for analysis purposes. The finding of the study indicate that there is a growing interest in addressing the relationship between GHRM and GSCM practices and their joint impact on sustainable performance, encompassing economic, environmental, and social dimensions. The human resource aspect of environmental participation is identified as crucial for successfully implementing GSCM practices, highlighting the need to integrate GHRM with other organizational functions. Regarding methodology, the majority of studies used a quantitative survey approach, suggesting a need for future research to employ qualitative and mixed methods to gain deeper insights into the relationship between GHRM and GSCM practices. The review reveals that most studies were conducted in emerging countries, and there is still a lack of research in other contexts to explore the relationship between GHRM and GSCM practices. Moreover, the finding of the study provide insights for both practitioners and researchers, emphasizing the importance of integrating GHRM and GSCM practices for sustainable competitive advantage.
 
Melinska Ayu Febrianti, Qurtubi Qurtubi, Roaida Yanti, Hari Purnomo,
Volume 0, Issue 0 (10-2024)
Abstract

The retail industry is a vital sector of the world economy and is characterized by high competition, tight profit margins, and demanding consumers. Retail businesses must prioritize customer satisfaction, a crucial factor in competitiveness. Understanding customer buying behavior patterns can help select the best retail strategy to enhance product sales. This research aims to comprehend customer shopping behaviors based on retail sales transactions in Special Region of Yogyakarta and formulate the best strategies. This study uses multi-level association rules by dividing the data set hierarchy into categories, sub-categories, and items. The sales transaction data used comprises 5830 transaction records over a month. The results of this study reveal 24 associations among categories, 49 associations among sub-categories, and 12 associations among product items. The products frequently appearing in monthly transactions come from mineral water, cigarettes, and rice flour sugar. Moreover, the proposed marketing strategy recommendations include store layout improvement, planogram design, and bundled product offerings. This research addresses the lack of empirical evidence from a previous study and proposes that additional research should be conducted to verify the findings by collecting data from diverse locations, which may yield various outcomes.
Ebaa Dasan Barghouthi,
Volume 0, Issue 0 (10-2024)
Abstract

The patient has a legitimate role in the evaluation of the healthcare services provided to them; this evaluation can be measured through patient satisfaction, which is considered an effective tool to evaluate the provided services and the quality program for hospitals. This study aims to examine the association between patient satisfaction and hospital accreditation status. Cross-sectional design with a random sampling technique for adult hospitalized patients. The SERVQUAL instrument was utilized to measure the patient's satisfaction. The sample size included 800 patients from the two phases based on the inclusion and exclusion criteria, and the data was analyzed by SPSS version 26. The study’s findings showed that patient satisfaction both pre-accreditation and post-accreditation was high. The study showed that there is an as-sociation between patient satisfaction and patient accreditation status. In addition, there is an association between the satisfaction subscales (tangibles, responsiveness, and assur-ance) and accreditation status, with the exception of (reliability and empathy). For the pa-tient's demographics, there is an association between patients’ demographics and patient satisfaction, except for department and age. The study concludes that patients are satisfied post-accreditation and provides evidence that the hospital accreditation sta-tus had a positive impact on patient satisfaction.

F.d. Javanroodi , K. M. Nikbin ,
Volume 17, Issue 3 (9-2006)
Abstract

There is an increasing need to assess the service life of components containing defect which operate at high temperature. This paper describes the current fracture mechanics concepts that are employed to predict cracking of engineering materials at high temperatures under static and cyclic loading. The relationship between these concepts and those of high temperature life assessment methods is also discussed. A model for predicting creep crack growth initiation and growth in terms of C* and the creep uniaxial ductility is presented and it is shown that this model gives good agreement with the experimental results. The effects of cyclic loading on crack growth behaviour are considered and fractography evidence is shown to back a simple cumulative damage concept when dealing with creep/fatigue interaction. Finally a discussion is presented which highlights the important aspect of life assessment methodology for high temperature plant.


H. Yarjiabadi, M. H. Shojaeefard, A.r. Noorpoor, H.yarjiabadi, , M. Habibian , A.r. Noorpoor ,
Volume 17, Issue 3 (9-2006)
Abstract

The hydrocyclone has a very important roll in industrial separation. The consideration of its behavior is very important for design. In this investigation, behavior of water flow and particles trajectory inside a hydrocyclone has been considered by means of numerical and experimental methods, and results have been compared together. To have a numerical simulation, a CFD software was used, and for modeling flow the RNG k – model applied. Finally, the effect of particle size on hydrocyclone performance has been studied. It was found that the grade efficiency and number of particle that exit from underflow of the hydrocyclone is increased when bigger particles is used.

A series of experiments has been carried out in a laboratory with a hydrocyclone. Comparison shows that, there is a good agreement between the CFD models and experimental result.


M. Haghpanahi, H. Pirali ,
Volume 17, Issue 3 (9-2006)
Abstract

Finite element analysis of a tubular T-joint subjected to various loading conditions including pure axial loading, pure in-plane bending (IPB) and different ratios of axial loading to in-plane bending loading has been carried out. This effort has been established to estimate magnitudes of the peak hot spot stresses (HSS) at the brace/chord intersection and to find the corresponding locations as well, since, in reality, offshore tubular structures are subjected to combined loading, and hence fatigue life of these structures is affected by combined loading. Therefore in this paper, at the first step, stress concentration factors (SCFs) for pure axial loading and in-plane bending loading are calculated using different parametric equations and finite element method (FEM). At the next step, the peak HSS distributions around the brace/chord intersection are presented and verified by the results obtained from the API RP2A Code procedure. Also the locations of the peak hot spot stresses which are the critical points in fatigue life assessment have been predicted. 


M. M. Shokrieh, R. Rafiee ,
Volume 17, Issue 3 (9-2006)
Abstract

The main goal of this research is to extract the full mechanical properties of stitch biax and triax composite materials which are necessary for finite element analysis, based on limited available experimental data and without performing full static characterization tests. Utilized experimental data are limited to elastic modulus of two 0o and 45o directions. Using presented technique and aforementioned data, mechanical properties of unidirectional fabrics of biax and triax are obtained and consequently mechanical properties of biax and triax composites are calculated. Evaluation of the results proved proper performance of the technique in this research.


M.r. Modarres Razavi, S.h. Seyedein, P.b. Shahabi , S.h Seyedein,
Volume 17, Issue 3 (9-2006)
Abstract

In this paper hemodynamic wall parameters which play an important role to diagnose arterial disease were studied and compared for three different rheology models (Newtonian, Power law and Quemada). Also because of the pulsatile behavior of blood flow the results were obtained for three Womersley numbers which represent the frequencies of the applied pulses. Results show that Quemada model always located between Newtonian and Power law models however its behavior is closer to Power law model. Concerning this behavior and better agreement between Quemada and experimental blood viscosity, it can be expected that Quemada results are more realistic and accurate.


M. Nikian, , M. Naghashzadegan, S. K. Arya ,
Volume 17, Issue 3 (9-2006)
Abstract

The cylinder working fluid mean temperature, rate of heat fluxes to combustion chamber and temperature distribution on combustion chamber surface will be calculated in this research. By simulating thermodynamic cycle of engine, temperature distribution of combustion chamber will be calculated by the Crank-Nicolson method. An implicit finite difference method was used in this code. Special treatments for piston movement and a grid transformation for describing the realistic piston bowl shape were designed and utilized. The results were compared with a finite element method and were verified to be accurate for simplified test problems. In addition, the method was applied to realistic problems of heat transfer in an Isuzu Diesel engine, and gave good agreement with available experimental.


M. H. Shojaeefard, F. A. Boyaghchi , M. B. Ehghaghi ,
Volume 17, Issue 4 (11-2006)
Abstract

In this paper the centrifugal pump performances are tested when handling water and viscous oils as Newtonian fluids. Also, this paper shows a numerical simulation of the three-dimensional fluid flow inside a centrifugal pump. For these numerical simulations the SIMPLEC algorithm is used for solving governing equations of incompressible viscous/turbulent flows through the pump. The k-ε turbulence model is adopted to describe the turbulent flow process. These simulations have been made with a steady calculation using the multiple reference frames (MRF) technique to take into account the impeller- volute interaction. Numerical results are compared with the experimental characteristic curve for each viscous fluid. The data obtained allow the analysis of the main phenomena existent in this pump, such as: head, efficiency and power changes for different operating conditions. Also, the correction factors for oils are obtained from the experiment for part loading (PL), best efficiency point (BEP) and over loading (OL). These results are compared with proposed factors by American Hydraulic Institute (HIS) and Soviet :::union::: (USSR). The comparisons between the numerical and experimental results show good agreement.


Gh. Yari , M. D Jafari ,
Volume 17, Issue 4 (11-2006)
Abstract

Main result of this paper is to derive the exact analytical expressions of information and covariance matrix for multivariate Pareto, Burr and related distributions. These distributions arise as tractable parametric models in reliability, actuarial science, economics, finance and telecommunications. We showed that all the calculations can be obtained from one main moment multidimensional integral whose expression is obtained through some particular change of variables. Indeed, we consider that this calculus technique for that improper integral has its own importance.


 


A. Shidfar, Ali Zakeri,
Volume 17, Issue 4 (11-2006)
Abstract

This paper considers a linear one dimensional inverse heat conduction problem with non constant thermal diffusivity and two unknown terms in a heated bar with unit length. By using the WKB method, the heat flux at the end of boundary and initial temperature will be approximated, numerically. By choosing a suitable parameter in WKB method the ill-posedness of solution will be improved. Finally, a numerical example will be presented.


M.r. Alirezaee, S.a Mir-Hassani,
Volume 17, Issue 4 (11-2006)
Abstract

In the evaluation of non-efficient units by Data Envelopment Analysis (DEA) referenced Decision Making Units (DMU’s) have an important role. Unfortunately DMU’s with extra ordinary output can lead to a monopoly in a reference set, the fact called abnormality due to the outliers' data. In this paper, we introduce a DEA model for evaluating DMU’s under this circumstance. The layer model can result in a ranking for DMU’s and obtain an improving strategy leading to a better layer.


M. Nadjafikhah, H. R. Salimi Moghaddam ,
Volume 17, Issue 4 (11-2006)
Abstract

In this article, we generalize the concept of the Lie algebra of vector fields to the set of smooth sections of a T-bundle which is by definition a canonical generalization of the concept of a tangent bundle. We define a Lie bracket multiplication on this set so that it becomes a Lie algebra. In the particular case of tangent bundles this Lie algebra coincides with the Lie algebra of vector fields.


A. Aghajani , V. Roomi ,
Volume 18, Issue 1 (1-2007)
Abstract

Abstract: This paper investigates the problem of whether all trajectories of the system and cross the vertical isocline, which is very important for the existence of periodic solutions and oscillation theory. Sufficient conditions are given for all trajectories to cross the vertical isocline.

 


M.b Ghaemi , P. Spain ,
Volume 18, Issue 1 (1-2007)
Abstract

Abstract: In this paper, we exhibit new conditions for the sum of two commuting AC-operators to be again an AC-operator. In particular, this is satisfied on Hilbert space when one of them is a scalar-type spectral operator.

 


M. Nadjafikhah , A.r. Forough ,
Volume 18, Issue 1 (1-2007)
Abstract

Abstract : Let be a 2nd order ODE. By Cartan equivalence method, we will study the local equivalence problem under the transformations group of time-fixed coordinates. We are going to solve this problem by an applicable method which has been recognized by R. Gardner, and classify them.

  


K. Maleknejad , M. Rabbani ,
Volume 18, Issue 1 (1-2007)
Abstract

 Abstract: There are some methods for solving integro-differential equations. In this work, we solve the general-order Feredholm integro-differential equations. The Petrov-Galerkin method by considering Chebyshev multiwavelet basis is used. By using the orthonormality property of basis elements in discretizing the equation, we can reduce an equation to a linear system with small dimension. For numerical examples, the solutions may be produced with good accuracy, by choosing suitable trial and test spaces in Petrov-Galerkin method.

 



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