درخت حوزه‌های تخصصی

Trust establishment (TE) among sensor nodes has become a vital requirement to improve security, reliability, and successful cooperation. Existing trust management approaches for large scale WSN are failed due to their low cooperation (i.e., dependability), higher communication and memory overheads (i.e., resource inefficient). This paper provides a new and comprehensive hybrid trust estimation approach for large scale WSN employing clustering to improve cooperation, trustworthiness, and security by detecting selfish sensor nodes with reduced resource (memory, power) consumption. The proposed scheme consists of unique features like authentication based data trust, scheduler based node trust, and attack resistant by giving the high penalty and minimum reward during node misbehavior. A task scheduling mechanism is employed for scheduling the significant task to reduce computation overhead. The proposed trust model would be capable to provide security against blackhole attack, grey hole attack, and badmouthing attack. Moreover, the proposed trust model feasibility has been tested with MATLAB. Simulation results exhibit the great performance of our proposed approach in terms of trust evaluation cost, prevention, and detection of malicious nodes with the help of analyzing consistency in trust values and communication overhead.

The bibliometric study aims to map and expand respective knowledge by establishing connections between important actors in academic research regarding the government venture capitals (GVCs). The scope is to analyze documents published on Scopus database starting from 2011 to 2020.  Accordingly, the United States (U.S.) is the top country in all categories with China catching up. Alperovych, Quas, and Colombo are top co-authors. On the other hand, Leleux, Grilli, Lerner and Cumming are prolific authors. Articles by Grilli and Li Y are two most cited documents. Investments, venture capital, economics, public policy, and government are most co-occurrence index keywords. Research policy, venture capital, and journal of technology transfer, journal of business venturing and small business economics are top sources of cited documents. Closely associated themes with respect to the study of GVCs are government role in venture capital support, effective Innovation financing policies, performance differential, performance of portfolio companies, funding challenges and investment strategy, decision making model and critical success factors for IT startups. The analysis generated gaps and directions for future research consisting of fund’s structure and characteristics, key personnel’s work experience and network, geographic location, investment horizon, shareholding rights.

The article considers a method for solving an information asymmetry problem that is relevant for the banking sector. The authors compare bank products and services in which tariff packages are consist of different informational components. The principal feature of the proposed method is to focus on obtaining a subjective evaluation of the attractiveness of the Bank’s offers for specific target groups. This makes the proposed method relevant for Central and commercial banks, as well as for consumers of banking products. Since complex tariff packages of different banks contain not only many indicators but also different sets, it is impossible to directly compare them. The proposed method allows solving the main informational problems of traditional methods for comparing banking products. Using the Fuzzy Inference System (FIS) allows a flexible approach to the aggregation of singular indicators of tariff packages and simplifies the expert procedures. To make rules for fuzzy inference, linguistic constructions close to the natural language can be used. This makes it easier to fill the knowledge base. To solve the set tasks, a methodology for constructing hierarchical FIS is used. In comparison with non-hierarchical FIS it can reduce the requirements to the number of rules in fuzzy inference rule base and system implementation time. The experiments with the fuzzy inference system, which implements a corporate credit cards tariff packages comparison of four Ukrainian banks, showed the effectiveness of the proposed approach. The obtained numerical results are adequately interpreted for the highlighted groups of banking product consumers

It is truly undeniable that tourism is a system leading to epistemology and resulting in spiritual growth and excellence. The mission of the journey lies in its spiritual achievements and eco-lodges provide the potential context for mutual interconnections and gaining meaning and excellence. Therefore, lacking emphasis on spiritual potentials of eco-lodges in the accommodation sector is the main concern of this research. The present study aims to identify the factors influencing the landscape development of eco-lodges from the viewpoint of tourists to explain and analyze the realization of the spiritual landscape of eco-lodges via the perception of the eco-lodges’ landscape. The main concern of this qualitative research is seeking what a tourist sees, what he understands, how the type of accommodation would lead him from objectivity to subjectivity and ultimately, how the perception of the spiritual landscape from tourist’s view is. Answering research questions through the qualitative method with an interpretive approach and inductive strategy has been conducted by a semi-structured interview tool. Besides, the research data is gathered via two phases of coding the general concepts and classification of concepts based on the frequency. Lastly, the findings have been analyzed and interpreted through a conceptual framework. Based on research results, staying in eco-lodge causes leading resident tourist from objectivity to subjectivity and this is derived from perception of spiritual landscape. The components of the eco-lodges’ landscape adapting with three  parameters of spirituality in tourism, lead tourists to the perception of the spiritual landscape as well as the realization of the mutual understanding of nature and man in the journey and the achievement of the meaning and spirit through accommodation in eco-lodges.