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  • 1
    Publikationsdatum: 2019-12-31
    Beschreibung: We propose and show efficiency of a new fuzzy-transform-based numerical method of solving ordinary differential equations with boundary conditions. The focus is on weak solutions and a special construction of a two-parameterized family of test functions. On theoretical and computational levels, we show how the proposed technique relates to and outperforms the Ritz–Galerkin method. We emphasize the importance of the proposed technique by considering its application to a real-life problem—the option pricing policy.
    Digitale ISSN: 2075-1680
    Thema: Mathematik
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Publikationsdatum: 2019-12-31
    Beschreibung: A fluent economical collaboration between countries is a major need. European flows of trade and people are supported by efficient connections between main localities from a geographic region, in many cases overriding national borders. This paper introduces three traveling salesmen problem instances based on freely available geographic coordinates of the main cities of France, Portugal and Spain. These instances are unified, generating other four larger instances: three with all pairs of countries and one instance with the settlements from all the three countries. The study includes an analysis of quality of solutions for a version of branch & cut algorithm and some hybrid heuristics including the Lin–Kernighan algorithm. $Bormathring{u}vka$, Quick$Bormathring{u}vka$ and Greedy algorithms are also used in the hybrid approaches in order to obtain a potential beneficent initial solution for the Lin–Kernighan algorithm. Concorde solver, nowadays state-of-the-art exact software, together with the already mentioned algorithms, is used to test and furthermore analyze the new TSP instances. Some results are represented using online services such as Google Maps, showing the potential integration of the Concorde’s optimum results into commercial routing applications. The very good results provided by the Lin–Kernighan method allow its usage for real medium-sized routing instances.
    Print ISSN: 1367-0751
    Digitale ISSN: 1368-9894
    Thema: Mathematik
    Publiziert von Oxford University Press
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Publikationsdatum: 2019-12-31
    Beschreibung: Specifically tailored industrial control systems (ICSs) attacks are becoming increasingly sophisticated, accentuating the need of ICS cyber security. The nature of these systems makes traditional IT security measures not suitable, requiring expressly developed security countermeasures. Within the past decades, research has been focused in network-based intrusion detection systems. With the appearance of software-defined networks (SDNs), new opportunities and challenges have shown up in the research community. This paper describes the potential benefits of using SDNs in industrial networks with security purposes and presents the set up and results of a pilot experiment carried out in a scaled physical implementation. The experimental set up consists in the detection of ICMP flood and packet payload alteration based on signature comparison. Results point to the potential viability of the technology for intrusion detection and the need of researching in architectural scalability.
    Print ISSN: 1367-0751
    Digitale ISSN: 1368-9894
    Thema: Mathematik
    Publiziert von Oxford University Press
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Publikationsdatum: 2019-12-31
    Beschreibung: The starting point is Peano’s expression of the axiomatics of natural numbers in the framework of Leśniewski’s elementary ontology. The author enriches elementary ontology with the so-called Frege’s predication scheme and goes on to propose the formulations of this axiomatic, in which the original natural number (N) term is replaced by the term Anzahl (A). The functor of the successor (S) is defined in it.
    Digitale ISSN: 2075-1680
    Thema: Mathematik
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Publikationsdatum: 2019-12-31
    Beschreibung: Historical sites may be found in nearly all small towns in Poland. Some are listed by UNESCO as World Heritage Sites. The purpose of the paper is to discuss the role of these resources in the broader set of elements shaping the tourism potential of towns, and also to illustrate the regional differences among small towns in Poland in terms of their potential to develop a local or regional tourism sector. The study provides a typology of towns based on local natural and landscape elements, cultural heritage resources as well as hotels and other tourist accommodations. The statistical data discussed in this paper was obtained from the Local Data Bank of Statistics Poland for the period 2012–2014, while historical sites were chosen from the National Heritage Board of Poland. The study covers all small towns in Poland and has shown unequivocally that the presence of a historical site is not necessarily a factor in the overall development of a local tourism sector. The cultural resources appear to be an undervalued asset, which can be used to develop a local tourism sector, especially in towns which are searching for new development paths.
    Print ISSN: 1231-1952
    Digitale ISSN: 1896-1525
    Thema: Geographie , Politikwissenschaft
    Publiziert von De Gruyter
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Publikationsdatum: 2019-12-31
    Beschreibung: We investigated the spatial variation patterns of voting results in Polish parliamentary election in 2015 across 380 regions. That election was a milestone event in Polish politics that substantially affected Poland’s internal and foreign policy directions and promoted two emerging political parties as runners-up against the well-established ones. While socio-economic, cultural and geographical factors such as economic activity, historical legacies (post-Russian East vs post-German West) and economic dichotomies (cities vs the countryside) explain most variations for most parties, they do not appeared to fit as determinants of the new parties’ support, especially of right-wing populists. Demographic target groups of individual parties appear to be relatively unresponsive to their pre-election offerings. The spatial specification of econometric models considerably improves their statistical properties. We also examined mixed-W models to account for the unobservable spatial effects stemming from the construction of constituencies. Their distinctive sets of candidates added significantly to the explanation of the spatial variation in voting.
    Print ISSN: 1231-1952
    Digitale ISSN: 1896-1525
    Thema: Geographie , Politikwissenschaft
    Publiziert von De Gruyter
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Publikationsdatum: 2019-12-31
    Beschreibung: Italy is undoubtedly one of the key actors in the current international “migration crisis” in the Mediterranean region. The paper aims to provide an overview of both the opportunities and problems for the Italian integration policy as of today. The authors intend to indicate the role of civil organisations in the ‘Italian migration issue’ and to emphasize the uniqueness of their initiatives. The study will provide an insight into one of the major immigrant communities, the Africans, through the civil organisations which have been working with them. The paper, based especially on empirical field experiences, is the result of a two-and-a-half-year research in Italy with different scholarships, coupled with other field trips in several sub-Saharan African countries.
    Print ISSN: 1231-1952
    Digitale ISSN: 1896-1525
    Thema: Geographie , Politikwissenschaft
    Publiziert von De Gruyter
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 8
    Publikationsdatum: 2019-12-31
    Beschreibung: In this article, the history of emigration from Germany and the immigration to Germany especially in relation to its changing borders in the 20th century is discussed. After 1945 Germany was confronted with the integration of a million German refugees. Starting in the 1950s, Germany intentionally attracted foreign workers, and integrated them fairly well. The article analyses the current discussions in Germany in relation to the impact of massive immigration of refugees from non-European areas around 2015. It concludes with a position that in the time of globalisation migration needs a society-focussed and political learning process which has not yet ended and will require more learning. But countries with a declining population are well advised to see immigration as an opportunity for future growth and social diversity.
    Print ISSN: 1231-1952
    Digitale ISSN: 1896-1525
    Thema: Geographie , Politikwissenschaft
    Publiziert von De Gruyter
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 9
    Publikationsdatum: 2019-12-31
    Beschreibung: The flow of immigrants into Europe is a phenomenon commonly known since the end of the Second World War. To a large extent it was the result of a colonial and then post-colonial relationship between metropolises and their overseas territories. Migration movements in Europe intensified after 1989 along with systemic changes in the eastern part of the continent. The phenomenon of increased migration to Europe observed since March 2015 combines both processes: economic migration, which undoubtedly dominates in terms of number, and exiles, of a much smaller scale, but given as the cause of migration by almost all migrants. A new phenomenon is the fact that a large part of migrants constitutes uncontrolled migration, which in previous years was marginal. In 2015, asylum applications were submitted in EU countries by as many as 1.25 million people. The influx of refugees to Europe has become not only a demographic phenomenon, but also a political one, evoking strong political emotions. Mass migrations also seem to be an instrument of international policy implementation by key world powers. The main purpose of the article was to present the background of the mass migration to Europe that took place in 2015. The main reasons for the decision to emigrate by the citizens of origin countries were shown, as well as the routes by which refugees flow into Europe.
    Print ISSN: 1231-1952
    Digitale ISSN: 1896-1525
    Thema: Geographie , Politikwissenschaft
    Publiziert von De Gruyter
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 10
    Publikationsdatum: 2019-12-31
    Beschreibung: After the end of the bipolar world, the possibility of an East–West mass migration became a new issue that took root in the Italian consciousness in forms masked by the feelings of the threat of an imminent “mass invasion” from Central and Eastern Europe. This new fear stimulated restrictive measures belatedly adopted in Italy and created a de facto unjust and imbalanced condition for new migrants from Eastern Europe because the first South–North migrations’ wave had already occurred when the regimes of Central and Eastern Europe collapsed. There are many evident similarities between the beliefs, attitudes and the use of insecurity (not based on data) of the 1990s and the current Italian migration policy. What they have in common is the incorrect perception and the misuse of it by politicians and propagandists. Immigration from Eastern Europe continues to be compared to that from the South of the world and Asia which continues to be interpreted without considering their real natures and the actual trends that characterise them. According to new studies that compared survey results with population data, contemporary Italians overestimate the number of immigrants coming from outside the EU to their country more than any other Europeans. As a result, the misuse or ignorance of the data on migrations is particularly dangerous because the devaluation of them has critical implications for policymaking.
    Print ISSN: 1231-1952
    Digitale ISSN: 1896-1525
    Thema: Geographie , Politikwissenschaft
    Publiziert von De Gruyter
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
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