European Journal of Formal Sciences and Engineering最新文献

{"title":"Using a Fast Elitist Non-Dominated Genetic Algorithm on Multi-Objective Programming for Quarterly Disaggregation of the Gross Domestic Product","authors":"Raïmi Aboudou Essessinou, G. Degla","doi":"10.26417/ejef.v4i1.p24-45","DOIUrl":"https://doi.org/10.26417/ejef.v4i1.p24-45","url":null,"abstract":"Abstract This research paper we use a fast elitist multiobjective genetic algorithm to solve the new approach that we propose to quarterly disaggregating of the Gross Domestic Product (GDP) by multiobjective programming. Thus, the quarterly disaggregation of the GDP is described as a quadratic multiobjective programming problem that generalizes Denton’s proportional method. The proposed approach has the advantage reduce to one the number of optimization programs to be solved. Our proposed method can be applied to the national accounts of any country that has adopted the National Accounting System. The simulation results are compared to those obtained using Denton’s proportional method and these results revealed the overall performance of the multiobjective programming approach for the quarterly disaggregation of GDP. Our approach is more suitable for taking into account the links between branches of national accounts, in terms of volumes and prices of products demanded during the production process. Also, it reduces forecast error and volatility of quarterly GDP. Besides, it is worth noting that our method is a usfull step for data processing such as chain-linked measures, overlap growth techniques, seasonal adjustment and calendar effects adjustment, in time series and econometrics analysis.","PeriodicalId":202400,"journal":{"name":"European Journal of Formal Sciences and Engineering","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121778961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Europe’s Economic Crisis: Re - Clustering European Economies","authors":"Antonios Kargas, M. Kiriakidis, E. Zacharakis, Dimitrios Varoutas","doi":"10.26417/ejser.v7i1.p41-50","DOIUrl":"https://doi.org/10.26417/ejser.v7i1.p41-50","url":null,"abstract":"Abstract National debt and distressed banks in countries such as Greece led to an ongoing recession since the beginning of Europe’s economic crisis. At the same time, austerity measures, all over Europe, reshape economies in a trial to increase global competitiveness. Economic integration as a challenge for social prosperity seems more crucial than ever, while it is a matter of research whether the acquired economic policies lead to further divergence. The paper explores how economic crisis has affected 40 European economies, by using macroeconomic indexes. A re-clustering of these economies is attempted for detecting similarities and differences between European economies. The analysis reveals how close an economic integration is and how a multi – speed European economy would look like today. Moreover, it explores how European economies have transformed during the last five years, in terms of competitiveness’ similarities and how the Gross National Income is related with governance indicators.","PeriodicalId":202400,"journal":{"name":"European Journal of Formal Sciences and Engineering","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124520651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Identification of the Tourism Risks for Z-Value Based Risk Assessment","authors":"A. Nuriyev","doi":"10.26417/ejef.v3i3.p47-55","DOIUrl":"https://doi.org/10.26417/ejef.v3i3.p47-55","url":null,"abstract":"Abstract The growing importance of the tourism sector to the global economy contributes to the increase of research in tourism risks assessment. In view of this tendency, the results of research in the field of the risk analysis on tourists’ travels in various countries during the last decades have been analyzed. Commonly used in these studies statistical methods allow to reveal and identify country-specific tourism risks and threats. But it is necessary to underline that relevant statistical data on risks are available not in all cases and countries. Moreover, in most cases, the reliability of the information available is questionable. In order to improve the reliability and quality of the tourist risk assessment, it is proposed to consider tourist travel as a project. The proposed project approach to tourist risk analysis provides an opportunity to go beyond assessment based on available country-specific inferior statistical data and allows to develop a more flexible and versatile method for risk evaluation. Common risk factors and sub-factors for tourists were identified for further risk assessment using suggested by L. Zadeh Z-number. A bi-component Z-number Z = (A, B) with perception-based and imprecise parts A and B, allows taking into account the reliability of the information. Risk experts deal with the prediction like this one “very likely that the level of threat N is medium” or “extremely likely that this factor is very important”. This prediction can be formalized as a Z-number based evaluation and a pack of Z-valuations is considered as Z-information. Experts evaluate identified risk factors and sub-factors and their importance weight using Z-numbers.","PeriodicalId":202400,"journal":{"name":"European Journal of Formal Sciences and Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129556588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparing Different Equipment and Applications in Pavement Data Collection as Part of Road Management System","authors":"Arjol Lule, S. Daja","doi":"10.26417/ejef.v3i3.p39-46","DOIUrl":"https://doi.org/10.26417/ejef.v3i3.p39-46","url":null,"abstract":"Abstract National roads are the main arteries in road transport infrastructure. Therefore, all agencies or authorities responsible of road infrastructure, pay attention to road management systems. Albania is experiencing an increase in road infrastructure investments and maintenance of this road network. There have been some attempts to establish national and secondary road management systems. These systems attempt to achieve different objectives, such as the provision of an adequate level of service, the preservation of the road infrastructure, etc. A good Road Asset Management System (RAMS), helps to carry out all the actions of inventory, storage and maintenance of road assets as well as, supports the decision-making process. At present, there are several data collection devices and applications that carry out the job efficiently. The purpose of this paper is to present the analysis of the use and comparison of some equipment and Cell Phone Based Systems (MiniROMDAS, PaveProf-V2 and RoadLab_Pro) used for the road pavement data collection, necessary in the calculation of the International Roughness Index (IRI), along the national road network in Albania. The comparison is made, by analyzing the data and results obtained along a 20 km long road segment in Albania, using the various above-mentioned technologies. Also, an overview of the currently available technologies providing information that could assist managers in establishing an appropriate data collection program is given.","PeriodicalId":202400,"journal":{"name":"European Journal of Formal Sciences and Engineering","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127835553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optical Solitons and Demonstration of Its Application","authors":"A. Hayrapetyan","doi":"10.26417/ejef.v3i3.p32-38","DOIUrl":"https://doi.org/10.26417/ejef.v3i3.p32-38","url":null,"abstract":"Abstract Solitons are structurally stable solitary waves that propagate in a nonlinear medium. In this paper, solitons will be considered as the basis for solving many classical nonlinear equations of motion. Some classical solutions that were modeled through the application of Wolfram Mathematica System and MATLAB programming language. In this paper some soliton solutions will also be compared and some types of solitons were modeled.The dynamics of solitons was studied in consideration of solutions of some equations, such as the Korteweg - de Vries equation and as a particular solution for the nonlinear Schrödinger equation provided that the nonlinearity parameter R>0 in the equation. We concluded by showing solitons in more detail which are often used in practice as a simpler method for explaining complex phenomena and solving non-classical equations","PeriodicalId":202400,"journal":{"name":"European Journal of Formal Sciences and Engineering","volume":"206 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121530382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Comparison of Some Methods in Analysis of Linear Regression Using R Software","authors":"I. Palla","doi":"10.26417/ejef.v3i3.p22-31","DOIUrl":"https://doi.org/10.26417/ejef.v3i3.p22-31","url":null,"abstract":"Abstract This article contains the OLS method, WLS method and bootstrap methods to estimate coefficients of linear regression and their standard deviation. If regression holds random errors with constant variance and if those errors are independent normally distributed we can use least squares method, which is accurate for drawing inferences with these assumptions. If the errors are heteroscedastic, meaning that their variance depends from explanatory variable, or have different weights, we can’t use least squares method because this method cannot be safe for accurate results. If we know weights for each error, we can use weight least squares method. In this article we have also described bootstrap methods to evaluate regression parameters. The bootstrap methods improved quantile estimation. We simulated errors with non constant variances in a linear regression using R program and comparison results. Using this software we have found confidence interval, estimated coefficients, plots and results for any case.","PeriodicalId":202400,"journal":{"name":"European Journal of Formal Sciences and Engineering","volume":"149 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130899926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Qualitative Research as a Tool to Carry out Architectural and Industrial Design Projects: A Vision from the Academic Perspective","authors":"Luciana Cruz, Leyda Milena Zamora Sarmiento","doi":"10.26417/ejef.v3i3.p6-12","DOIUrl":"https://doi.org/10.26417/ejef.v3i3.p6-12","url":null,"abstract":"Abstract In recent years, qualitative research has gained ground as one of the main tools to analyze reality and propose innovation projects. This qualitative methodology has strengthened an innovative pedagogical structure, within the teaching of design disciplines. This is the specific case of our educational activity in the Modular System (UAM X), which facilitates the application of these tools in the design process. Reviewing the data in the analysis in a more qualitative way, promotes a more credible, reliable and valid vision to propose solutions to the problems detected. Thus, achieving a comprehensive understanding of the phenomenon and considering the factors involved in order to generate more relevant solutions. Within architecture, some projects that are addressed, such as the historical and cultural heritage of spaces and cities, use qualitative research techniques to discover and interpret the real vision of the inhabitant/visitor of these spaces. It is essential to understand how the city is lived from the point of view of the different actors that interact in the space, in order to generate plans and projects that reinforce and enrich social interaction. In industrial design, the students take these tools and apply them to the first phase of their project in search of insights that will allow them to bring forward innovative products with a real impact on society. This paper addresses these two cases, highlighting the importance of these tools being internalized by our students completing their training with a research profile focused on design.","PeriodicalId":202400,"journal":{"name":"European Journal of Formal Sciences and Engineering","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125438746","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Specifics of Algorithmization in Data Culture","authors":"Tadeusz Miczka","doi":"10.26417/ejef.v3i3.p13-21","DOIUrl":"https://doi.org/10.26417/ejef.v3i3.p13-21","url":null,"abstract":"Abstract Information societies effectively transform existing cultures. New cultures are variously defined, but because of the fact that they are dominated by information, the term “data cultures” seems to be the most relevant name for them. Although, it is possible to create a single global data culture in the future and such predictions prevail in academic and non-academic reflections on this subject, so far in addition to global trends there occur local data cultures, what also dynamizes and enriches both individual and collective identities. As Kazimierz Krzysztofek aptly notes, in this situation: \"The greatest contradiction of the civilization of the 21st century is drawn. On the one hand, a continuous imperative: be creative and innovative, on the other hand, an increasing pressure on prediction of people’s behaviour, because unpredictability causes chaos, which cannot be managed\". In other words, one of the most important social issues today is to create some order in data culture / cultures (often pictured by columnists and researchers as a \"magnetic storm\"), to reduce its / their infinite complexity, i.e. simply the algorithmization process. With regard to culture, it is not possible to use unequivocally a mathematical algorithm that is the most precise, or a genetic or hormonal algorithm that functions in nature, because accustoming cultural chaos is always strongly ideologized. The algorithm should be treated as a metaphor used to explain cultural phenomena, especially their developmental tendencies. For the researcher of contemporary societies, it is very important to answer the question: what proportions of structure and network are the most beneficial for the survival of data culture / cultures? This answer also directs reflection on the quality of life of individuals and societies, limiting or promoting individualism and collective intelligence in the era of hyper-digitization. These considerations are limited to the initial characterization and evaluation of the information algorithmization of man. The author of the study refers to the concepts of researchers from different countries, highlighting the specificity of today's algorithmization, among others the model of ambient perception, which facilitates participation in the networked information environment, scope and reach of the big data phenomenon, forms of data visualization, personalization of content, Isotype visual language, network custody, data journalism and others. In conclusion, it is pointed out that the information algorithmization of man is constantly growing, which proves that data management strategies weaken the phenomenon of information overload through the logic of numerical civilization, which limits diversity, seeking to count, record and globalize everything.","PeriodicalId":202400,"journal":{"name":"European Journal of Formal Sciences and Engineering","volume":"288 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130699373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Using Unmanned Aerial Vehicles (UAVs) to Analyze the Urban Environment","authors":"E. Bakogiannis, C. Kyriakidis, Vasileios Zafeiris","doi":"10.26417/ejef.v3i2.p20-28","DOIUrl":"https://doi.org/10.26417/ejef.v3i2.p20-28","url":null,"abstract":"Abstract Over the last decades, the evolution of technology has helped us to facilitate various types of works in areas related to land and property management as well as spatial planning. The exploitation of new tools and methods has prompted the international interest in the recording and modeling of geospatial information in more than two dimensions depicted in traditional projects, until then. This has contributed to address a series of issues related to intense urbanization, as well as challenges in identifying complex ownership and building structures. A relatively recent such method is the mapping of buildings and wider spatial units by using Unmanned Aerial Vehicles (UAVs) that has contributed to the production of 3D models by using the appropriate software. This technology finds resonant in recent years in Greece. However, it has not been applied to the mapping of large spatial units such as urban areas. This research paper performs a wide area mapping using UAV. Its purpose is to investigate to what extent the UAVs can do it successfully. For this reason, a brief evaluation is attempted, taking into account the accuracy of the data as well as the cost and time required in relation to traditional techniques. The result justifies the specific technique that appears to produce good quality metering and quality data while helping to save resources.","PeriodicalId":202400,"journal":{"name":"European Journal of Formal Sciences and Engineering","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126048019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Students Training Through Applied Activities at Department of Automation and Applied Informatics, University Politehnica Timișoara","authors":"I. Silea, Paul Negîrla, A. Korodi, O. Stefan","doi":"10.26417/ejef.v3i2.p11-19","DOIUrl":"https://doi.org/10.26417/ejef.v3i2.p11-19","url":null,"abstract":"Abstract The paper is focused on the practical knowledge transfer problems in higher education engineering. The objective is to improve the knowledge transfer in order to facilitate rapid workplace integration. The curriculum and the practical training of students at University Politehnica Timisoara, Department of Automation and Applied Informatics are presented and discussed. The implication of companies in the students’ practical training is highlighted. A practical knowledge transfer system is proposed, based on logical distribution of the requirements for a single practical application, transversally, to the curriculum courses. The initial changes in the curriculum, introduced after the Bologna Declaration, are presented for the previously mentioned department. Ideas and questions were released which can be clarified, interpreted and criticized, providing a discussion base that can be benefic to the academic and industrial community. The presented changes were discussed with the economical zonal partners (companies: Continental Automotive, Hella, Nokia, Yazaki, Huf, Flextronics, etc.), being appreciated and sustained by the companies.","PeriodicalId":202400,"journal":{"name":"European Journal of Formal Sciences and Engineering","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115338438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}