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Accessibility to urban facilities and public services is nowadays one of the key factors that impacts the quality of urban live. That being said, accessibility is a complex concept, which although in common use, has a range of meanings, and measuring it raises numerous methodological problems. For instance, accessibility is closely related to the concept of distance, but as a society evolves, other factors such as travel time, economic cost, different transport options, interest or attraction of the destination co...

In this study, we collected data from nine domestic Irish bank web sites and nine domestic Finnish bank web sites. Both countries have many similarities in political, demographical, financial and economical areas. Each of the selected banks represent a typical domestic bank, which is under the control of the respective national central bank. The results of the study could be used as a guide for good and bad practices because of highly qualified personnel employment in the credit institutions, decisions are based u...

Digital ecosystems represent a new technology capable of interconnecting heterogeneous, cross-domain platforms, able to drive innovation in different industries, enabling us to connect and operate with a wide range of actors, customers, partners, companies. Digital ecosystems can be considered as socio-technical clusters of adaptive applications with different levels of context awareness, adaptability and autonomicity. The adaptive properties of an organism are closely related to the self-organizing property and t...

Study of wave motions fluid is one of the most important and complex problems of modern hydrodynamics. This issue is receiving significant attention in fluid mechanics, hydraulics, acoustics, oceanography and physiology of circulation. Special mention should be made of the relevance of the objectives of the movement body of finite size in fluid, ship hydrodynamics tasks, tasks construction of coastal protection, as well as the increasing interest in modeling the planet's climate. The fluid flows in the presence of...

The demand for an indoor navigation service is increasing as indoor positioning technology is developed, therefore it is necessary to construct indoor network data that can be directly used for navigation. In this study, indoor network data were constructed using indoor evacuation map images, which can be easily obtained. The evacuation route in the map can be used as network information because it represents the connection between each room as well as the connection between room entrances and the main entrance of...

Approximation of multi-extremum functions problems arise in a wide range of fields including deterministic and stochastic technics, multi-parameter optimization. The main focus of this thesis is to consider the different principle of approximation problem. Experimental definition of external impacts on complex technogenic systems is related to technical difficulties. This area of research arises from the fact that many problems of multi-extremum optimization are known to be computationally difficult (NP-hard). We ...

Petri nets is the well-known mathematical tool for the modeling and verification of parallel systems of all kind. Multiprocess Petri multinets with time stamps (MPTSM) are the newly introduced class of low-level Petri nets, whose definition and the properties are the main topic of this article; they generalize the properties of P/T Petri multiprocess multinets in the area of design, modeling and verification of generally parallel programming systems with the discrete time. The MPTSM with the support of the ASYNC-C...

Process and plant design need to be continuously improved, the use of new safety concepts to a full extent being one of the key parameters leading to their sustainable improvement. Accidents occurred over time in industrial facilities where explosive gas or vapor atmospheres may be present have put the explosion risks high on the agenda of regulators, operators, accident investigators or researchers in the field. Accidental flammable gas leaks in mixture with air may generate explosive atmospheres which once ignit...

This article presents an approach for managing and comparing data, concerning some main food products in Bulgaria. The source for the search of these product categories (bakery products, milk and milk products, fish and fish products and etc.) is the created relational database. The extracted data for the selected category have been grouped, compared and processed. The obtained results enable the user to present relevant conclusions for the examined time interval. This approach is applied to the data on bread and ...

The transition to advanced digital, intelligent production technologies, the creation of systems for processing big amounts of data, machine learning and artificial intelligence is caused, among other things, by the need to move to a new level of digital energetics, which ensures the interrelationship between the generation, distribution and consumption of energy resources and their effective management. The efficiency of the use of energy resources is one of the urgent problems in the energy sector. One of the pr...

In this research we investigate the significance of the CGAL library which is a source of algorithms related to computational geometry. We briefly describe the exact computation paradigm that provides obtaining reliable geometrical results. We present the advantages of using the CGAL library in terms of investigating certain parameters of geological planar structures. We show that several parameters that can be computed and attributed to considered planes and subsequent use of further statistical methods becomes p...

The advancement of tracking technologies such as RFID (Radio Frequency Identification) in recent years supported the study area of shopping behavior of consumers in retailing setting has globally regained increased interest. However, only few studies have attempted to analyze consumer shopping behavior using the RFID data. The purpose of this paper is to propose the framework based on behavioral and environmental variables, which can be tested using the RFID data obtained from the recent experiment in one of the s...

The sudden and intensive variations of the ionosphere could be represented through its basic property ? electron density which is the main parameter concerning radio propagation through this part of the atmosphere. It is radio sounding as one of the main measurement methods applied among numerous methods for electron density estimation suitable for different ionosphere sub-regions monitoring as a part of the remote sensing Earth observation technics. Collecting VLF/LF (3-300 kHz) radio sounding data which reflect ...

The machines used in hard coal mining must exhibit very good technical, safety and reliability parameters. These parameters determine their efficiency, operational safety and effectiveness of the entire production process. The last several decades have seen increased mechanisation of the mining process. Increasingly more cutting-edge and efficient machines have been used for this purpose. Attempts have also been made to partially or fully automate the process of mining. The concept of an ?intelligent? mine has com...

Ecological and resort area of Caucasian Mineral Waters occupies a special place among the resort regions of Russia due to the richness, diversity, quantity and value of mineral waters, landscape and climatic conditions, therapeutic muds. The pace of development of mineral water resources for the resort and industrial bottling has recently increased. The increase in the number of enterprises for bottling mineral water and organizations of sanatorium-resort type has a significant impact on the growth of water intake...

The article deals with the synthesis of a closed distributed control system for the drill temperature field. The technique is developed on the basis of the the temperature fields control function. The analysis and modeling of the drilling process during the passage of the drill through the variable environment (ice-ground-ice-water-ice) are performed with taking into account the drill heating. To increase the productivity of the passage, it is proposed to use sectional heating of the drill instead of the existing ...

The aim of this study is to determine the geocenter dynamics described by dynamic adaptive regression and the general laws of DORIS and GPS navigation systems. A spatial geocenter dynamics can be represented as coordinate and time series. Mathematical description of the time series allows for determination of systematic change in the geocenter dynamics. To improve the accuracy of modeling and forecasting of the geocenter dynamics and to identify the regular effects, the dynamic regression modeling approach is used...

The comparative analysis of approaches to the management of surface water bodies in Ukraine, taking into account the provisions of the European Union (EU) Directive on river basin management plans in monitoring surface waters using geoinformation systems (GIS). The main deficiencies of the system of state monitoring of surface waters are identified. The introduction of GIS technologies for estimating and predicting changes in surface waters is proposed to take the necessary measures for the adoption of environment...

An algorithm for extracting information on the types and subtypes of soils for each pixel of big data sets of remote sensing on agricultural lands is proposed. For this, a mathematical apparatus for constructing a multi-temporal (empirical) soil line is used. The classical soil line (SL) is defined in the RED-NIR spectral space by two coefficients "a" and "b" [2, 6, 9]. In this form, SL does not characterize soil types and subtypes. A multi-temporal soil line (MSL) is the major axis of an ellipse that describes al...

The paper deals with the problem of evaluating the characteristics of information systems at the design stage. In the design of ERP-systems the most interest characteristic is not the average time, but the probability of timely delivery of different type messsages (for example, command, service, multimedia, files, etc.) from the sender to the recipient. In addition, the possibility of using the priority information management built on the basis of service disciplines of general form with mixed priorities must be c...

This paper describes an analysis of concrete pavement loading while taking into account deflections and deformations. Concrete pavements are generally durable and have low demands on maintenance within their whole lifecycle. The first part describes an experimental road test section with verified material characteristics of individual pavement construction layers by laboratory and non-destructive testing. Furthermore, the position of temperature sensors in road structure is described, together with loading data an...

For processing observations of the terrestrial pole dynamics, the regression dynamic modeling (RDM) approach was used. With the RDM software package the models describing the dynamics of the terrestrial polar coordinates were built. This approach provides accurate combined models of observations which describe to some extent causal and deterministic communication and provide forecast of characteristics. A comparison of observations and predicted values of the terrestrial polar coordinates obtained with the RDM app...

The estimation of groundwater levels in a basin is a very important factor for planning integrated management of groundwater and surface water resources. In this study, artificial neural network models have been developed for predicting and forecasting of groundwater level. The reliability of the computational models was analyzed based on simulation results and using three statistical tests including Pearson correlation coefficient, coefficient of determination and root-mean-square error. The artificial neural net...

Accurate prediction of reference evapotranspiration (ET0) is essential in water resources planning and management of irrigation systems. The ET0was determinate using the FAO-56 Penman-Monteith equation based on the weather data collected in Serbia during the period 1980-2010. The purpose of this research is to develop and apply the Extreme Learning Machine (ELM) to estimate and calculate the ET0. The process was implemented for eight input combinations in order to find the most optimal input combination for ET0 pr...

The paper deals with the problem of the influence of non-normative errors on the process of induction soldering of space vehicles waveguide paths. The application of the method of neural network modeling is proposed to solve the problem posed, which is a problem of classifying the errors of measuring instruments. As a tool, Deductor Academic software is used, which allows to conduct a wide range of analytical studies. The work presents the development of the structure of an artificial neural network for the classi...

Machine learning covers a wide set of supervised and unsupervised algorithms for solving prediction, classification and anomaly detection problems. One of the areas of their applications is for customer churn prediction. To build a model for predicting the switching of customers, data scientists use different demographics, social, transactional, behavioural metrics and features. At the same time, most of the small Bulgarian companies still don?t have the needed versatile and complete customer data. They rely mainl...

Earthen levees are commonly used protective structures against seasonal flood activity. Monitoring of the embankments condition is an important issue related to the protection of people's lives, their property, environment and infrastructure. The assessment of the physical condition of the levee can be obtained by comparison of the sensors measurements? localized within the embankment and the changes in parameters values obtained as a result of numerical modelling of flooding process. Uncertainty of the values of ...

The customer expects the quality and reliability of purchased devices. Every defect on the device causes loss of brand confidence and customer dissatisfaction. Customer satisfaction is, however, the best indicator of how likely customers will continue to buy in the future. If an organization wants to maintain a customer, it must be customer-oriented. The company has decided to improve the quality and reliability of its products. This can also help to increase the number of satisfied customers and gain competitive ...

Sources that contain data about tourism in Bulgaria are both structured and unstructured. Information from these xls and pdf files is organised in a created relational database. The database stores time series on tourism flow (trips of Bulgarian residents abroad and foreign tourists to Bulgaria), expenditure of outbound tourists, revenues from international tourism and employment in tourism. This article studies time series on trips of Bulgarian residents abroad (outbound tourists) by country of destination and by...

With the steady rise of interest in blockchain and related technologies, researchers are making efforts to solve the remaining open questions in this field. One of the open problems is to achieve and maintain some desired characteristics of a private blockchain as far as the block generation rate is concerned. This problem is routed in statistical modeling. In this work, we will apply the results of participatory computing to build private blockchains and to resolve this issue. Private blockchains are important in...

Further development of digital economy requires researching the limits of some algorithms applicability. These algorithms are based on the mechanisms obtained as a result of investigating the processes of ?alive? nature. Such algorithms were called the bio-inspired algorithms and are widely used in practice, for example, for solving the problems of multi-agent systems coordinated control. Application of coordinate descent, a type of gradient method ? extends the description of the existing shepherd dog algorithm. ...

This paper is about the reconfiguration of a simple radio frequency (RF) front-end transceiver belonging to an embedded system applied in the automotive industry, inside of the remote keyless entry (RKE) and part of the tire-pressure monitoring (TPMS) system on a car. The main concern of this article is to reduce volume and complexity as well as a lower radiation. The new product must keep the same at least the same RF performances or even higher ones in some situations. We also perform an impedance analysis for r...

Article proposed automated control system for cone crusher, which allows to integrate a set of interconnected technological units in the control system and a controller installed on the SCADA-system operator station in the control of common hardware equipment. The most important functions of the automated process control system crusher are the continuous monitoring of the equipment condition of the complex of crusher mechanisms and aggregates in the process of work and the formation of a signal to regulate the pro...

From a structural optimization point of view, the design of steel lattice towers begins with choosing from various alternatives to develop the geometry of the incorporated trusses. The biggest challenge is to find optimal geometry based on experience. In contrast to some structures that are generally intuitive to construct, (e.g. common buildings structures), the same design for the tower structures is frequently built for several times. Thus, cost savings and performance improvements obtained by structural optimi...

One of the most important issues in the problem of fusing partial maps without common reference frames into one large global map is requirement of manually obtaining the locations of mobile 3D laser scanners that are used to scan the environment. In this paper, we propose a novel positioning approach to obtain the locations of 3D laser scanners. The main limitation of our approach is that 3D laser scanners must be equipped with long-range wireless interfaces or off-the-shelf long-range wireless interfaces must be ...

Segmentation of badly structured images is a complex task for different models of artificial intelligence systems. The given work presents algorithmic solutions for intercellular relations measurement in peripheral blood. There has been proposed hybrid algorithm, allowing to distinguish three classes of formed elements: ?erythrocyte?, ?leukocyte? and ?not erythrocyte and not leukocyte?. The algorithm provides for two-level processing of the image. Analysis of geometric attributes of image segments and their colour...

Autostereoscopy is a method for effective visualization of three-dimensional models with the help of ordinary imaging techniques. It allows achieving the 3D object observation without the need for special goggles, displays or other equipment. The Method itself is using rapidly alternating images of given object taken from defined angles, mimicking the position of the human eyes. Such animation induces a sense of depth. Autostereoscopy can be applied to a static image or even dynamic video materials. Firstly, we ha...

The work considers information and computing technologies supporting regional deci-sions making and based on geoinformation web-systems and mapping web-services. The use of such systems for the information support of regional management is now becoming common. Long-term strategic forecasting and planning of territories development, solu-tion of various institutional and sectoral problems today are often based on the use of integrated information and computing environment, complex information systems of re-gional m...

The low ionospheric monitoring by very low and low frequency (VLF/LF) radio waves generates big databases containing information on high temporal resolution relevant to specific spatial areas. These data allow us to detect and model perturbations induced by different events. In this paper we present analyses of data relevant to periods around natural disasters. Our attention is focused on the tropical depressions which have been detected before the hurricane appearances in the Atlantic Ocean and the earthquake occ...

Human is a factor influencing the appearance and functioning of naturally set systems in the landscape. Its construction activity affects the events above and below the surface. The way in which the country is affected will be decided in the construction project in the planning and implementation phases of project management. During the construction phase, various stages of elaboration of the details of the project documentation arise. The current concept of the planning phase represents a burden for the coordinat...

The last decade has witnessed an exponential increasing in the number and the size of data centers. This expansion was driven by the increasing demand for digital products and services from the various sectors of the economy. Data center operators are faced with an increasing pressure for managing their facilities more efficiently and cost effectively such that they achieve 100 percent uptime. This is a difficult task to overcome, taking into account that energy consumption is the fastest growing component of data...

Managing knowledge is the most important part of every enhanced process. Well-adjusted knowledge management leads to effective way of sharing knowledge, its comprehension, visualization and managing other processes connected to it. New trend in the field of Civil Engineering and Building Design is BIM ? Building Information Modeling. Management of Building Information Modeling is very current topic linked with the creation of building modeling and knowledge sharing processes used by the Architecture, Engineering a...

The issues of teaching C++ programming language for cartographers and surveyors at the Moscow State University of Geodesy and Cartography are considered. As a result a new C++ programming course for undergraduate students has been developed. Cartographers and surveyors learning C++ programming are to solve tasks from the related areas of cartography and geodesy. The programming course is geared towards the needs of surveying and cartographic industry. This is the request of today to create programming courses suit...

Electromagnetic (EM) induction technique is one of the most important geophysical techniques in understanding the subsurface structure. The theory of magnetotelluric (MT) method, the main branch of the EM technique, was introduced during 50?s by Tickonov and Cagniard with the natural variation of electromagnetic fields, as its source. We will present the results of a study focused on the processing and modeling of magnetotelluric (MT) data in watered area located in the Moscow Region (Geophysical observatory "Mikh...

This study reviews the problem of creating an algorithm for classifying objects in a Grid system, which will allow the automation of this process to proceed. Splitting objects into classes allows you to effectively manage the resources and processes that occur in a distributed system. Classification according to the current values of characteristics, by reference values of characteristics, with an analysis of the original causes of the result and also a modeled classification is considered. The problem of determin...

Detecting objects in images is of widespread interest due to a large number of applications in diverse disciplines, including remote sensing, medical images, geology and civil infrastructure. This paper presents a comparison of selected techniques that may be useful for the object detection connected with ground deformations within large areas using satellite radar interferometry (DInSAR, Differential Interferometry Synthetic Aperture Radar) techniques. The DInSAR method, that exploits two SAR images, derives info...

The article deals with the problem of embedded computing systems testing and debug. The embedded systems design process, actual problems and existing solutions are analyzed from this perspective. The method of testing and debug based on model-oriented record and replay of the computational process is proposed, as well as the corresponding specification model for real-time computational processes. The specification model is a modified control flow graph. The key advantage of the proposed method is an abstract defin...

The article proposed the technology of monitoring the process control system the man-machine-environment. Machine Health Monitoring Center uses technology to identify trends that will help improve the service, support, and overall design of equipment. Technology specialists handle hundreds of alerts per day, either contacting the customer directly or passing the information on to a service manager or field dispatcher. Hardware-software automated monitoring enables structural studies and monitoring algorithms of te...

The article describes the concept connected vehicle remote diagnostic system intended to increase the useful life of the vehicle and provide a simple interaction with the service center. In article the substantiation of mathematical model of communications in system of diagnostics of an electric equipment of cars in a kind, suitable for mathematical processing is resulted. It is offered to use model at which all making systems are represented in the form of structure of final automatic machines. By means of large-...

Carrying out scientific experiments and field observations requires systematization, coordinated storage and possibility of online analytical processing of primary data to obtain consistent results and to discovery new knowledge. The article presents an approach to building a model-driven system based on the software platform of primary data collection and analysis. An approach to the constructing the control model of the data consolidation system based on the analysis of data description in the context of the sta...