Ústav informatiky

Browse

Recent Submissions

Now showing 1 - 5 of 80
  • Thumbnail Image
    Item
    Fuzzy Similarity Used by Micro-Enterprises in Marketing Communication for Sustainable Development
    (MDPI, 2019-09-30) Schüller, David; Doubravský, Karel
    The purpose of this paper is to present fuzzy reasoning as a formal tool for determining the differences in perception of individual communication channels by customers. These differences in customer perception are important for micro-enterprises to develop an effective green advertising campaign. These kinds of enterprises are not able to conduct their own extensive marketing research or use the service of marketing agencies. Micro-enterprises are the cornerstone for sustainable local economic growth where the community plays an irreplaceable role for sustainable development. Marketing communication is unique and complex because it focuses on feelings, moods, and personal preferences. The main problem is the uncertainty of this input data which makes it difficult to develop effective green advertising campaigns. Fuzzy sets and fuzzy reasoning are used to make verbal descriptions suitable for computer applications. A fuzzy pairwise similarity is used in this paper. The case study has eight relevant variables/marketing communication media, e.g., e-mailing, social networks, web pages, text messaging, newspapers, phone calls, posters and radio, and five segments of respondents selected by age. Each segment is presented as a fuzzy conditional statement. A set of fuzzy pairwise similarities is generated.
  • Thumbnail Image
    Item
    The focal boundary value problem for strongly singular higher-order nonlinear functional-differential equations
    (Springer Nature, 2015-01-30) Mukhigulashvili, Sulkhan; Půža, Bedřich
    The a priori boundedness principle is proved for the two-point right-focal boundary value problems for strongly singular higher-order nonlinear functional-differential equations. Several sufficient conditions of solvability of the two-point right-focal problem under consideration are derived from the a priori boundedness principle. The proof of the a priori boundedness principle is based on Agarwal-Kiguradze type theorems, which guarantee the existence of the Fredholm property for strongly singular higher-order linear differential equations with argument deviations under the two-point right-focal boundary conditions.
  • Thumbnail Image
    Item
    The periodic problem for the second order integro-differential equations with distributed deviation
    (Institute of Mathematics CAS, 2021-06-05) Mukhigulashvili, Sulkhan; Novotná, Veronika
    In the paper we describe the classes of unique solvability of the Dirichlet and mixed two point boundary value problems for the second order linear integro-differential equation b u (t) = p0 (t)u(t) + p1 (t)u(1 (t)) + p(t, s)u( (s)) ds + q(t). a On the basis of the obtained and, in some sense, optimal results for the linear problems, by the a priori boundedness principle we prove the theorems of solvability and unique solvability for the second order nonlinear functional differential equations under the mentioned boundary conditions.
  • Thumbnail Image
    Item
    The nonlinear Kneser problem for singular in phase variables second-order differential equations
    (Springer, 2014-09-30) Půža, Bedřich; Partsvania, Nino
    For the singular in phase variables differential equation u'' = f (t, u, u') ), sufficient conditions are found for the existence of a solution satisfying the conditions Phi(u) = c, u(t) > 0, u'(t) < 0 for t > 0, where Phi : C([0, a]; R+) to R+ is a continuous nondecreasing functional, c > 0, and a > 0.
  • Thumbnail Image
    Item
    Sustainability reports: Differences between developing and developed countries
    (Frontiers, 2023-03-29) Kvasničková Stanislavská, Lucie; Pilař, Ladislav; Fridrich, Martin; Kvasnička, Roman; Pilařová, Lucie; Afsar, Bilal; Gorton, Matthew
    Achieving sustainability is a major challenge faced by many societies. The increasing moral consciousness of stakeholders has put pressure on companies, forcing these companies to include long-term policies that reflect the regionally specific needs of stakeholders. Using a structural topic model, this study identified differences between developing and developed countries with respect to sustainability disclosures. Data were obtained from 2100 sustainability reports published in the United Nations Global Compact database for the year 2020. In global terms, these sustainability reports addressed three main topics: 1) human rights, 2) diversity, equity, and inclusion, and 3) sustainable production. Moreover, the sustainability reports from developing and developed countries incorporated different communication strategies. Based on the prevalence (rate of occurrence) of content, sustainability reports from developed countries predominantly communicated issues related to "sustainable production" and "supply chain emissions", whereas sustainability reports from developing countries more frequently communicated issues related to "education" and "human rights".