International Journal of Economics and Statistics

E-ISSN: 2309-0685
Volume 6, 2018

Notice: As of 2014 and for the forthcoming years, the publication frequency/periodicity of NAUN Journals is adapted to the 'continuously updated' model. What this means is that instead of being separated into issues, new papers will be added on a continuous basis, allowing a more regular flow and shorter publication times. The papers will appear in reverse order, therefore the most recent one will be on top.

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Volume 6, 2018

Title of the Paper: Cyber Security Measures In Companies


Authors: Mladen Vukašinović

Pages: 125-128

Abstract: Proposal of cyber security measures in companie. Cyber security is currently the most wanted and most challenging research discipline that is in constant development. Data reference institutions and recognized to security researchers in 2017 shows that cyber criminals using 'low-tech' software were successful in 9 of 10 attacks on various web sites. Most web sites had serious flaws for a period of 150 days or more. Various invasions and fraud have cost the company $ 6.6 billion annually. Based on the research of Oracle java in America is the biggest security risk for desktop computers. According to reports java is installed on 65% of computers, 48% of users did not have the latest patches for Java last year been identified 119 new vulnerabilities in the software. According to research, mobile phone users are increasingly exposed to cyber attacks. Based on analysis of more than 400 000 applications available in the most popular apps and Google applications 14 000, or 3% have security vulnerabilities, including sensitive information such as location, text messages and contacts. In this work will be given to the proposal of measures that could improve the protection of computer systems from unauthorized intrusion.

Title of the Paper: Customization of Multi-Agent Systems for Adaptive Resource Management with the Use of Domain Ontologies


Authors: George Rzevski, Petr Skobelev, Alexey Zhilyaev, Oleg Lakhin, Igor Mayorov, Elena Simonova

Pages: 112-124

Abstract: Nowadays, the demand for increasing business efficiency is constantly growing, calling for development of resource management systems that can be applied to solve a wide range of complex tasks with minimum costs and within a limited time period. Unfortunately, traditional combinatorial or heuristic methods and tools cannot reach good enough solutions for complex tasks of real-time resource management. For this reason, the paper considers multi-agent technology as the key element of the required solutions. It can help find the balance of interests of all parties involved and flexibly adapt it to unpredictable events, such as, for example, a new order, inaccessible resources, delay of operations, etc. This paper presents the use of ontology for planning, giving the opportunity to develop an ontological enterprise model and a generic multi-agent scheduler, as well as to customize the appropriate requirements for each operation in business processes or technological processes in production applications, project management, supply chains and so on. At the top of the ontology editor is the Semantic Wikipedia, supporting the enterprise knowledge base for the tasks of resource management. The paper also provides examples of applications for supply chain in insurance business and management of maintenance of complex technical objects.

Title of the Paper: Alternatives of work With Risks Used at Technological Facilities Safety Management


Authors: D. Prochazkova, J. Prochazka

Pages: 105-111

Abstract: The aim of all people is human security and development. Therefore, they need technological facilities, which ensure energy, services and products for life. Present cognition shows that safety of technological facilities is based on copping with risks. Human cognition contains a lot of knowledge and experiences with risks, but in reality only part of them are used in practice. The aim of research, the results of which are presented, was the judgement, how in practice connected with complex technological facility safety it is used the present human cognition on work with risks. With regard to world dynamic development it is necessary the priority risks to monitor and to cope with them during time, and also to measure the respective safety. At measure of rate for safety level we use the known experience that the better coping with relevant risks, the higher facility safety level is. The analysis of based publications and data from real practice shows that seven domains at work with risks are important. The paper shows the results of critical judgement of individual techniques that are used at work with risks in technological facilities in practice.

Title of the Paper: Modeling of the Control of Innovative Processes of a Production Activity Taking into Account Risks


Authors: Vitalina Babenko, Abdel-Badeeh M. Salem

Pages: 99-104

Abstract: The article considers the research of control of innovative processes of a production activity of an enterprise. It influences of various production and external factors, including risks. The content and a formulation of the problem of a multi-level process of control of the production innovative activity of an enterprise in the presence of risks is developed. Proposing method is based on the solution of the discrete optimization problem with a help of minimax. The established optimal management provides a guaranteed result for a solution to the problem of control of innovative processes, taking into account the risks. At the same time, we reduced the complex problem of dynamic optimization of control with the consideration of risks to the realization of a finite sequence of one-step problems of discrete optimization.

Title of the Paper: Integrated System for Burnout State Assessment


Authors: Yunis Nassar, Razvan Marcus, Andreea Cristina Ionica, Monica Leba

Pages: 95-98

Abstract: The paper proposes a burnout state assessment device and system able to cope with the modern hard-working world syndrome. This syndrome is difficult to detect by first symptoms, usually it is detected when it is too late. This proposed burnout state assessment device provides real-time information on the state-of-stress of the individual, using a low number of physiological parameter signals to have an acquisition system as less invasive and intrusive as possible. Therefore, only three physiological signals are required, namely Galvanic Skin Response, Blood Oximetry and Heart Rate, since these three provide accurate information on the physiological state of individuals. The implementation of proper sensors for the three signals acquisitions require little hardware, being suitable for a wearable device.

Title of the Paper: Business Transformation Projects: An Intelligence Driven Development for Enterprise Architecture and Asset Management-The Basics


Authors: Antoine Trad, Damir Kalpic

Pages: 87-94

Abstract: This article’s authors based their research on an authentic mixed multidisciplinary research method that is supported by intelligent neural networks and a heuristics module, named the Applied Mathematical Model (AMM) [1][2][3] [29]. Where the proposed AMM is similar to the human decision-making process. The AMM is supported by a real life case of a business transformation initiative in the domain of Enterprise Asset Management (EAM)[4]. The proposed AMM offers a set of solutions in the form of financial, technical and managerial recommendations, to be used by the target company’s business analysts and enterprise architects to implement EAM solutions in the context of Business Transformation Projects (BTP). Heuristics is applied in real world problems that are very similar to transformation projects. The AMM is not influenced by any specific business domain and has a holistic approach that uses a neural networks processor. The AMM is based on a reasoning concept that is basically a qualitative research method that manages and qualifies Critical Success Factor (CSF) sets, actions and final solutions [5]. The AMM’s underlined system supports the BTPs in integrating scenarios that are sets of interactive services.

Title of the Paper: Motivating the Citizens to Transact with the Government Through a Gamified Experience


Authors: Vasileios Yfantis, Klimis Ntalianis, Peter A. Xuereb, Lalit Garg

Pages: 81-86

Abstract: The current paper explores the implementation of gamification in the government as a way to win back trust from the citizens. The motivation of the citizens to interact with the public authorities through e-government, requires a suitable gamification framework. Octalysis framework is chosen among the available gamification frameworks due to its motivation orientated nature. Octalyis is used a tool for a pilot study to gamify the Greek taxation information system TAXIS and reveals that TAXIS requires entertaining web aspects for its long term use by the citizens.

Title of the Paper: Key Drivers of Business Transformations in the Environment of Travel Intermediaries


Authors: I. Mihajlovic, L. Raguz

Pages: 67-80

Abstract: Through an overview of business innovatios, socio-environmental and economic possibilities that enlightened the relations of subjects in the travel market this paper examines the impact of changes in the macro-environment on the transformation of travel intermediaries. For purposes of this study new trends are analyzed through changes of technology, socio - environmental and economic variables. Theoretical aspect of the changes in macro environment that influences the further business development of travel intermediaries was studied in the first part of paper. Business transformation of intermediaries is focused on quality towards innovations in communication between tourists and service providers, respecting social and environmental elements when creating products. In online environment the behavior of the tourist is changing, leaving space for the development of advantages. ICT adhered to the time and spatial convergence. Developped online applications and interactive websites allowed tourists to map out their travel decisions when creating their travel itineraries. The paper also emphasizes the empirical research carried out among the managers of travel intermediaries in Croatia. The significance of changes on a macro environment level has been studied. Research findings point out socio-environmental changes in tourism that affect the business transformation of travel agencies. Socio-environmental responsibility is very significant or significant for further business activities of travel agencies towards innovations. Economic growth as a stimulus to business activities of travel agencies creates new opportunities for intermediaries through more favorable transactions. By testing of market position and competitiveness at the same time, the role of travel intermediaries is reinvigorated.

Title of the Paper: The Implementation of Think Pair Share to Increase Learning Outcome in Science Subject


Authors: Shella Permatasari, Mur Fatimah. Eko Supraptono, Anggit Wijanarka

Pages: 62-66

Abstract: The aim of this study is to increase teachers’ performance, students’ learning activities, and student achievement in science learning process by using Think Pair Share at 5th grade students of SDN Bongkok 01 (elementary School) Tegal Regency. Classroom action research was used which consisted of two cycles. Each cycle consisted of planning, action, observation, and reflection. The subjects were students and classroom teacher of 5th grade students of SDN Bongkok 01. The data were gathered test and non – test. The results showed that in the first cycle, the score of teacher performance was 81, 59 and it increased in second cycle into 85, 93. Score of student activities in the first cycle was 66, 57 and it increased in the second cycle into 77, 68. The average score of the students was 80, 00 and the percentage of learning mastery was 83, 34%. Score of classroom average improved from the first cycle into 81, 87 and percentage of mastery learning classical increased into 91, 66 percent in the second cycle. It can be concluded that there was an increase learning quality at science learning at 5th grade SDN Bongkok 01 Tegal.

Title of the Paper: Search Convenience and Access Convenience: The Difference Between Website Shopping and Mobile Shopping


Authors: Ibrahim Almarashdeh, Kamal Eldin Eldaw, Ghaith M. Jaradat , Mutasem AlSmadi, Usama A. Badawi, Firas Haddad

Pages: 58-61

Abstract: Now a day we use online platforms for everything in our daily life. Using shopping online via mobile application and shopping via online website become a typical procedure in our daily life. People like to do shopping online, but we still did not know the different between shopping via mobile apps and website adoption in term of access convenience and search convenience. This study aimed to investigate the different between shopping via mobile apps and website adoption in term of access convenience and search convenience. This study used a sample of 143 participant to measure the adoption of shopping online via both website and mobile shopping. The collected data analyzed using SPSS. The results show that mobile apps is more adopted in term of accessibility but website shopping is more adopted in term searchability. This study did not find significant difference it term of total adoption of both website and mobile shopping. The future researchers could focus in measuring the difference in term of usability and security which we assume could bring a valid result.

Title of the Paper: Location-Pricing Problem in the Closed-Loop Supply Chain Network Design Under Uncertainty


Authors: F. Jolai, A. Zabihian, R. Tavakkoli-Moghaddam, P. Memari

Pages: 52-57

Abstract: This paper presents a bi-objective credibility-based fuzzy mathematical programming model to design a location-pricing decision problem in a closed-loop supply chain with a single product under uncertainty. This problem aims to maximize the total supply chain profit by determining the optimal number of the facility location, collection and distribution centres (CDCs), the assignment of the customer zones to the CDCs and the CDCs to the plants, the price of the new product and the incentive value of the returned product that should be offered for used product. In order to cope with the uncertainties, an appropriate fuzzy method based on the credibility measure is developed. To validate the presented model, a numerical example is taken into account.

Title of the Paper: NoQueue, a Crowdsourcing Queue Management Application


Authors: C. E. Stoica, L. A. Toader, G. V. Stoica

Pages: 46-51

Abstract: Crowdsourcing is a form of collaboration evolved under Web 2.0 that helps in finding efficient solutions to current problems by public participation of actors, i.e. crowd, using mass spread technologies as Internet, mobile devices, social media. In this paper we analyze the challenges that a crowdsourcing developer faces and we propose a solution for the queue management problem based on the NoQueue application.

Title of the Paper: A Performance Comparison Study with Information Criteria for MaxEnt Distributions


Authors: Ozer Ozdemir, Aslı Kaya

Pages: 40-45

Abstract: In statistical modeling, the beginning problem that has to be solved is the parameter estimation of the empirical distribution which fits the data appropriately, and then decision can be given by making goodness of fit test or using error measures to determine the accuracy of the predicted model. One of the frequently used measures for such purposes is Mean Square Error (MSE) which formula is defined as the difference between the actual observations and the response predicted by the model and is used to determine with how much error the model fit the data, Root Mean Square Error (RMSE), Mean Absolute Proportion Error (MAPE) etc. measures can be also used for the similar aims. According to this information; firstly, a simulation study is prepared. Then, maximum entropy (MaxEnt) distributions for the error distribution of data is demonstrated and the best fitted distribution is found based on the information criterion.

Title of the Paper: When Statistics and Management Meet - Consumers' Attitudes Towards the Communication of Sports Brands in Social Networks


Authors: Helena Sofia Rodrigues, Álvaro Cairrão, Cristina Ponte

Pages: 34-39

Abstract: The large number of users of different social networks makes them a key channel of approach, interactivity and sharing between consumers and brands. The increasing access and use of social networks brought challenges in communication and marketing strategies. The present investigation proposed to analyze and understand the opinions of consumers regarding the communication of sports brands in social networks and also to evaluate its impact on their purchase intentions and recommendation. The data collected allowed to conclude that the formation of a favorable attitude by consumers towards the communication of sports brands in social networks should be based on informative, relevance of contents, and credible communication created in an entertainment context. This positive attitude towards brands has favorable repercussions in the buyers’ intention and recommendation.

Title of the Paper: Statistical Relationship Between Workplace Well-Being and Productivity


Authors: Ilona Cserháti, Tibor Keresztély, Tibor Takács

Pages: 25-33

Abstract: The paper focuses on the relationship between workplace well-being and productivity in the European countries. The so called Oaxaca decomposition technique has been chosen to verify the hypothesis of positive relationship and to quantify how the job-satisfaction may increase the productivity in the different European regions. The developed market economies are considered according to the four main social models (Anglo-Saxon, Nordic, Mediterranean and continental countries), while three groups of transition economies are distinguished (Baltic, Middle and South-Eastern European countries). It has been found that workplace well-being have a relevant impact on productivity in the European economies, but the strength of this impact show a positive correlation with the development level. Also a supplementary calculation is presented indicating that the impact is relevant both in the developed market economies and in the less developed transition economies.

Title of the Paper: Generating a Highlight Moments Summary Video of an Political even Using Social Media Speech Sentiment Analysis Ontologies


Authors: Mehdi Abid, Benayad Nsiri, Yassine Serhane

Pages: 19-24

Abstract: Numerous viewers choose to watch political or presidential debates highlights via TV or internet, rather than seeing the whole debate nowadays, which requires a lot of time. However, the task of making a debate summary, which can be considered neutral and does not give out a negative nor a positive image of the speaker, has never been an easy one, due to personal or political beliefs bias of the video maker. Our study came up with a solution that generates highlights of a political event, based on twitter social network flow. We used twitter streaming API to detect an event's tweets stream using specific hashtags, and detect on a timescale the extreme changes of volume of tweets which will determine the highlight moments of our video summary at first, then we set up a process based on a group of ontologies that analyze each tweet of these moments to calculate the sentimental score of each, then classify those moments by category (positive, negative or neutral).

Title of the Paper: Conceptual Model Mathematical as a Strategy for Learning in Students of Initial Levels of the Careers of Science of Engineering


Authors: Ives Torriente, Arlys Lastre, Eliane Fernández

Pages: 14-18

Abstract: In the present investigations the authors show an application scheme of the mathematical models in the resolution of problems of the engineering sciences is presented through research projects that contribute to the development of the mathematical knowledge of the first level students of engineering science. In the study the authors show the application of numerical methods such as linear interpolation, Lagrange polynomial interpolation and regression models through Statgraphics software for electromechanical engineers. These tools are expressed in the resolution of problems of low complexity and allow establishing evaluation criteria to the students on the importance of the study of the mathematics for the professional formation in the area of the engineering. The use of numerical methods tools for solving practical problems in first-level students of engineering science careers develops critical analytical skills and strengthens them in the use of computational sciences for electromechanical engineering

Title of the Paper: Analysis of Factors Affecting the Technical Efficiency: A Case Study


Authors: Md. Moyazzem Hossain, Ajit Kumar Majumder

Pages: 10-13

Abstract: The measurement of the production efficiency in agricultural production is very important since it gives useful information for making decisions, resource allocations, and for formulating agricultural policies and institutional improvement. This paper attempts to estimate the individual banana farmer’s technical and scale efficiency in Kushtia district of Bangladesh by input and output-oriented Data Envelopment Analysis (DEA) model considering the variable returns to scale (VRS) assumption. The result specifies that the average technical efficiency (TE) and scale efficiency (SE) for banana farmers in Kushtia district is about 87% and 97% respectively for both input and output oriented VRS. Also, Tobit regression shows the variation of TE is related to farm-specific attributes such as age, experience, education of farmers and firm size. All of these factors provide a positive impact on farmer’s efficiency. Therefore, this study suggests that the existing inefficiency may be reduced through training, policy interventions, adoption and spread of improved agricultural mechanization.

Title of the Paper: Incentive-Based Demand Response: A Rebate-Based Design


Authors: Nhat-Vinh Vo, Klaus Frank, Josef Haunschmiedy, Raimund Kovacevicz, Georg Panholzer

Pages: 1-9

Abstract: In future power grids, the high penetration with Renewable Energy Resources (RES) will be a big challenge. The problem is not the high RES contribution per se, but even desirable in order to make a decisive contribution to climate protection through CO2-neutral power generation. The problem lies in particular in the fact that power stations based on fossil fuels in current electricity networks are stabilizing factors and sources of operational flexibility. In future electricity grids, new sources of flexibility must be tapped - not only at the generation but also on the side of demand, e.g. through Demand Side Management (DSM). Various approaches are divided into direct and indirect control methods. In this paper, we present a model class of Incentive-based Demand Response (IbDR), where the power consumption of household coalitions is indirectly controlled by rebates on electricity bills. We apply the theory of (convex) cooperative games to design IbDR events that promote cooperative behavior of households. In particular, the methods are designed so that the use of storage (batteries) are very beneficially integrated. We have developed a simulation tool MASim that simulates electricity consumptions of households. Using MASim we carried out numerical experiments, which show the functionality of our proposed IbDR method. In field studies, we developed the ICT and tried out how batteries can be controlled within the scope of our proposed IbDR schemes.