Technologies for integration of e-content is considered. Such integration is useful for generatio... more Technologies for integration of e-content is considered. Such integration is useful for generation of new e-learning content, for actualization and extension available one. The automatic search and integration of e-content is a tendency, which is widely used for the domain of information services. The paper addresses technological tools which can be used for automation of information processes. Standards and their implementation in workflow technology stack is classified and discussed. It has been found a set of tools, which respect standards and makes in a common sequence the development of workflow solutions.
Abstract: Workflow management systems as modelling technique for monitoring, support and control ... more Abstract: Workflow management systems as modelling technique for monitoring, support and control of business processes are under consideration. Problems, related to the assessment of software prod-ucts, used for the design and exploitation of workflow management systems are presented. The attention is drawn towards the comparison and assessment of such software tools. The results of this assessment are presented.
Resume: The paper performs an overview concerning the quality of the software products. Particula... more Resume: The paper performs an overview concerning the quality of the software products. Particularly workflow products, which operate on Web environments with multiple user access, are considered. Evaluation schemes are presented, which introduce quantitative ranking. Thus, the products can be assessed and compared to define the prospective set of software.
Annotation: With the rise of the Web as the major platform for making data and services available... more Annotation: With the rise of the Web as the major platform for making data and services available for both, humans and applications, a new challenge has become prevalent requiring the support of workflows management. This is a mature technology for automating and controlling business processes. A general task of the development of the workflow system in the current business activities is the implementation of principles of the automatic control for business systems. These systems do not consist of pure technical components, but they integrate both human and human-computer activities and non-automatic interactions. Thus, the implementation of the principles of the automation will benefit the exploitation behaviour of the business systems. This paper presents an implementation of a workflow system applied for the academic practice of a research organization. Illustrations with application of workflow design tools for modeling and execution are given. Key words: automation of business ...
Abstract: Routing in computer network is an essential functionality, which influence both the net... more Abstract: Routing in computer network is an essential functionality, which influence both the network management as the quality of services in global networks. The management of the traffic flows has to satisfy requirements for volume of traffic to be transmitted as avoidance of congestions for decreasing the transmission delays. These two requirements in general are contradictory. The optimal traffic management is a key issue for the quality of the information services. Routing in networks, applying shortest path algorithm is widely used in communication protocols in WAN. Short explanations and illustration of these algorithms is given.
2021 International Conference Automatics and Informatics (ICAI)
Quantitative approach is developed for decision making in investments in real estates. The decisi... more Quantitative approach is developed for decision making in investments in real estates. The decision making is based on formal model of portfolio theory. The process of decision making is based on definition and solution of a set of portfolio optimization problems. The developed formalization of decision making is illustrated with real data of the real estate market in Bulgaria. The National and regional markets in Bulgariaaare analyzed. Optimal investment solutions in old and/or new real estates are evaluated.
The urban traffic control optimization is a complex problem because of the interconnections among... more The urban traffic control optimization is a complex problem because of the interconnections among the junctions and the dynamical behavior of the traffic flows. Optimization with one control variable in the literature is presented. In this research optimization model consisting of two control variables is developed. Hierarchical bi-level methodology is proposed for realization of integrated optimal control. The urban traffic management is implemented by simultaneously control of traffic light cycles and green light durations of the traffic lights of urban network of crossroads.
The paper realizes inclusion of probabilistic measure for risk, VaR (Value at Risk), into a portf... more The paper realizes inclusion of probabilistic measure for risk, VaR (Value at Risk), into a portfolio optimization problem. The formal analysis of the portfolio problem illustrates the evolution of the portfolio theory in sequentially inclusion of different market characteristics into the problem. They make modifications and complications of the portfolio problem by adding various constraints to consider requirements for taxes, boundaries for assets, cardinality constraints, and allocation of the investment resources. All these characteristics and parameters of the investment participate in the portfolio problem by analytical algebraic relations. The VaR definition of the portfolio risk is formalized in a probabilistic manner. The paper applies approximation of such probabilistic constraint in algebraic form. Geometrical interpretation is given for explaining the influence of the VaR constraint to the portfolio solution. Numerical simulation with data of the Bulgarian Stock Exchange...
2020 XI National Conference with International Participation (ELECTRONICA)
The paper describes an application of information technology to support decision-making for portf... more The paper describes an application of information technology to support decision-making for portfolio optimal investment. The decision making task is formalized as a portfolio optimization problem solved in Excel environment, which provides a practical tool for implementation in decision-making. The portfolio optimization applies maximization of Net Present Value (NPV) because the riskless return is close to zero. The obtained information technology solution is numerically tested with mutual funds, traded on the Bulgarian Stock Exchange in 2019.
An investment policy is suggested about assets on real estate markets. Such analysis recommends i... more An investment policy is suggested about assets on real estate markets. Such analysis recommends investments in non-financial assets and optimization of the results from such decisions. The formalization of the investment policy is based on the portfolio theory for asset allocation. Two main criteria are applied for the decision making: return and risk. The decision support is based on Mean-Variance portfolio model. A dynamical and adaptive investment policy is derived for active portfolio management. Sliding procedure in time with definition and solution of a set of portfolio problems is applied. The decision defines the relative value of the investment to which real estates are to be allocated. The regional real estate markets of six Bulgarian towns, which identify the regions with potential for investments, are compared. The added value of the paper results in development of algorithm for a quantitative analysis of real estate markets, based on portfolio theory.
Technological solutions for e-learning suits are presented: The solutions are based on integratio... more Technological solutions for e-learning suits are presented: The solutions are based on integration of informational resources in the global network as integration of information services. Concepts for the integration of resources and tools in Web are considered. Web service integration is addressed by the application of emerging standards and technologies. Examples of good practices for virtual learning platforms with Web services are discussed.
The optimal resource allocation of sets of securities, available in the financial market can be d... more The optimal resource allocation of sets of securities, available in the financial market can be done by solving a multi- criterion optimization task, aimed at maximization of portfolio return and minimization of portfolio risk. Here is proposed the utilization of hierarchical coordination for solving the bi-level optimization problem, which formalizes the investment process. A two-level hierarchical approach for solving the portfolio opti- mization problem is applied where the optimal Sharp ratio of risk versus return is solved at the upper level and as a result is determined by the investor's preferences for taking risk on the basis of objective considerations. The optimal portfolio is evalu- ated at the lower level. based on both optimization and probability theory. The investor's goal is to maximize the return and to minimize the risk of the investment decisions. The investor's return is formalized as the mean value of a random behaved function of the portfolio securi...
A quantitative analysis of the financial state of an animal husbandry is performed. The paper ill... more A quantitative analysis of the financial state of an animal husbandry is performed. The paper illustrates the usage of different economical parameters in order to present operational state of the husbandry and to search regularities for future actions. The added value of this research is the application of intelligent instruments in the management of the economic behavior of animal husbandry which give recommendations for their more effective functionality.
Annotation: With the rise of the Web as the major platform for making data and services available... more Annotation: With the rise of the Web as the major platform for making data and services available for both, humans and applications, a new challenge has become prevalent requiring the support of workflows management. This is a mature technology for automating and controlling business processes. A general task of the development of the workflow system in the current business activities is the implementation of principles of the automatic control for business systems. These systems do not consist of pure technical components, but they integrate both human and human-computer activities and non-automatic interactions. Thus, the implementation of the principles of the automation will benefit the exploitation behaviour of the business systems. This paper presents an implementation of a workflow system applied for the academic practice of a research organization. Illustrations with application of workflow design tools for modeling and execution are given.
Workflow management systems as modelling technique for monitoring, support and control of busines... more Workflow management systems as modelling technique for monitoring, support and control of business processes are under consideration. Problems, related to the assessment of software prod- ucts, used for the design and exploitation of workflow management systems are presented. The attention is drawn towards the comparison and assessment of such software tools. The results of this assessment are presented. Over the last decade there has been an increasing interest in information systems used to support, control, and monitor business processes. To implement automation techniques and control methods in the business processes it is necessary to apply modelling techniques for the non-technical and organizational systems and to extend the functionalities of the informational computer driven systems in the organizations. Mature technology for automating and controlling business processes are workflow management systems (1), (2). A general task of the workflow system in the current business ...
The research part of the survey includes defining and determination the transport capacity in tra... more The research part of the survey includes defining and determination the transport capacity in transportation graph where the potential of railway and bus transport in Bulgaria is rated.
Technologies for integration of e-content is considered. Such integration is useful for generatio... more Technologies for integration of e-content is considered. Such integration is useful for generation of new e-learning content, for actualization and extension available one. The automatic search and integration of e-content is a tendency, which is widely used for the domain of information services. The paper addresses technological tools which can be used for automation of information processes. Standards and their implementation in workflow technology stack is classified and discussed. It has been found a set of tools, which respect standards and makes in a common sequence the development of workflow solutions.
Abstract: Workflow management systems as modelling technique for monitoring, support and control ... more Abstract: Workflow management systems as modelling technique for monitoring, support and control of business processes are under consideration. Problems, related to the assessment of software prod-ucts, used for the design and exploitation of workflow management systems are presented. The attention is drawn towards the comparison and assessment of such software tools. The results of this assessment are presented.
Resume: The paper performs an overview concerning the quality of the software products. Particula... more Resume: The paper performs an overview concerning the quality of the software products. Particularly workflow products, which operate on Web environments with multiple user access, are considered. Evaluation schemes are presented, which introduce quantitative ranking. Thus, the products can be assessed and compared to define the prospective set of software.
Annotation: With the rise of the Web as the major platform for making data and services available... more Annotation: With the rise of the Web as the major platform for making data and services available for both, humans and applications, a new challenge has become prevalent requiring the support of workflows management. This is a mature technology for automating and controlling business processes. A general task of the development of the workflow system in the current business activities is the implementation of principles of the automatic control for business systems. These systems do not consist of pure technical components, but they integrate both human and human-computer activities and non-automatic interactions. Thus, the implementation of the principles of the automation will benefit the exploitation behaviour of the business systems. This paper presents an implementation of a workflow system applied for the academic practice of a research organization. Illustrations with application of workflow design tools for modeling and execution are given. Key words: automation of business ...
Abstract: Routing in computer network is an essential functionality, which influence both the net... more Abstract: Routing in computer network is an essential functionality, which influence both the network management as the quality of services in global networks. The management of the traffic flows has to satisfy requirements for volume of traffic to be transmitted as avoidance of congestions for decreasing the transmission delays. These two requirements in general are contradictory. The optimal traffic management is a key issue for the quality of the information services. Routing in networks, applying shortest path algorithm is widely used in communication protocols in WAN. Short explanations and illustration of these algorithms is given.
2021 International Conference Automatics and Informatics (ICAI)
Quantitative approach is developed for decision making in investments in real estates. The decisi... more Quantitative approach is developed for decision making in investments in real estates. The decision making is based on formal model of portfolio theory. The process of decision making is based on definition and solution of a set of portfolio optimization problems. The developed formalization of decision making is illustrated with real data of the real estate market in Bulgaria. The National and regional markets in Bulgariaaare analyzed. Optimal investment solutions in old and/or new real estates are evaluated.
The urban traffic control optimization is a complex problem because of the interconnections among... more The urban traffic control optimization is a complex problem because of the interconnections among the junctions and the dynamical behavior of the traffic flows. Optimization with one control variable in the literature is presented. In this research optimization model consisting of two control variables is developed. Hierarchical bi-level methodology is proposed for realization of integrated optimal control. The urban traffic management is implemented by simultaneously control of traffic light cycles and green light durations of the traffic lights of urban network of crossroads.
The paper realizes inclusion of probabilistic measure for risk, VaR (Value at Risk), into a portf... more The paper realizes inclusion of probabilistic measure for risk, VaR (Value at Risk), into a portfolio optimization problem. The formal analysis of the portfolio problem illustrates the evolution of the portfolio theory in sequentially inclusion of different market characteristics into the problem. They make modifications and complications of the portfolio problem by adding various constraints to consider requirements for taxes, boundaries for assets, cardinality constraints, and allocation of the investment resources. All these characteristics and parameters of the investment participate in the portfolio problem by analytical algebraic relations. The VaR definition of the portfolio risk is formalized in a probabilistic manner. The paper applies approximation of such probabilistic constraint in algebraic form. Geometrical interpretation is given for explaining the influence of the VaR constraint to the portfolio solution. Numerical simulation with data of the Bulgarian Stock Exchange...
2020 XI National Conference with International Participation (ELECTRONICA)
The paper describes an application of information technology to support decision-making for portf... more The paper describes an application of information technology to support decision-making for portfolio optimal investment. The decision making task is formalized as a portfolio optimization problem solved in Excel environment, which provides a practical tool for implementation in decision-making. The portfolio optimization applies maximization of Net Present Value (NPV) because the riskless return is close to zero. The obtained information technology solution is numerically tested with mutual funds, traded on the Bulgarian Stock Exchange in 2019.
An investment policy is suggested about assets on real estate markets. Such analysis recommends i... more An investment policy is suggested about assets on real estate markets. Such analysis recommends investments in non-financial assets and optimization of the results from such decisions. The formalization of the investment policy is based on the portfolio theory for asset allocation. Two main criteria are applied for the decision making: return and risk. The decision support is based on Mean-Variance portfolio model. A dynamical and adaptive investment policy is derived for active portfolio management. Sliding procedure in time with definition and solution of a set of portfolio problems is applied. The decision defines the relative value of the investment to which real estates are to be allocated. The regional real estate markets of six Bulgarian towns, which identify the regions with potential for investments, are compared. The added value of the paper results in development of algorithm for a quantitative analysis of real estate markets, based on portfolio theory.
Technological solutions for e-learning suits are presented: The solutions are based on integratio... more Technological solutions for e-learning suits are presented: The solutions are based on integration of informational resources in the global network as integration of information services. Concepts for the integration of resources and tools in Web are considered. Web service integration is addressed by the application of emerging standards and technologies. Examples of good practices for virtual learning platforms with Web services are discussed.
The optimal resource allocation of sets of securities, available in the financial market can be d... more The optimal resource allocation of sets of securities, available in the financial market can be done by solving a multi- criterion optimization task, aimed at maximization of portfolio return and minimization of portfolio risk. Here is proposed the utilization of hierarchical coordination for solving the bi-level optimization problem, which formalizes the investment process. A two-level hierarchical approach for solving the portfolio opti- mization problem is applied where the optimal Sharp ratio of risk versus return is solved at the upper level and as a result is determined by the investor's preferences for taking risk on the basis of objective considerations. The optimal portfolio is evalu- ated at the lower level. based on both optimization and probability theory. The investor's goal is to maximize the return and to minimize the risk of the investment decisions. The investor's return is formalized as the mean value of a random behaved function of the portfolio securi...
A quantitative analysis of the financial state of an animal husbandry is performed. The paper ill... more A quantitative analysis of the financial state of an animal husbandry is performed. The paper illustrates the usage of different economical parameters in order to present operational state of the husbandry and to search regularities for future actions. The added value of this research is the application of intelligent instruments in the management of the economic behavior of animal husbandry which give recommendations for their more effective functionality.
Annotation: With the rise of the Web as the major platform for making data and services available... more Annotation: With the rise of the Web as the major platform for making data and services available for both, humans and applications, a new challenge has become prevalent requiring the support of workflows management. This is a mature technology for automating and controlling business processes. A general task of the development of the workflow system in the current business activities is the implementation of principles of the automatic control for business systems. These systems do not consist of pure technical components, but they integrate both human and human-computer activities and non-automatic interactions. Thus, the implementation of the principles of the automation will benefit the exploitation behaviour of the business systems. This paper presents an implementation of a workflow system applied for the academic practice of a research organization. Illustrations with application of workflow design tools for modeling and execution are given.
Workflow management systems as modelling technique for monitoring, support and control of busines... more Workflow management systems as modelling technique for monitoring, support and control of business processes are under consideration. Problems, related to the assessment of software prod- ucts, used for the design and exploitation of workflow management systems are presented. The attention is drawn towards the comparison and assessment of such software tools. The results of this assessment are presented. Over the last decade there has been an increasing interest in information systems used to support, control, and monitor business processes. To implement automation techniques and control methods in the business processes it is necessary to apply modelling techniques for the non-technical and organizational systems and to extend the functionalities of the informational computer driven systems in the organizations. Mature technology for automating and controlling business processes are workflow management systems (1), (2). A general task of the workflow system in the current business ...
The research part of the survey includes defining and determination the transport capacity in tra... more The research part of the survey includes defining and determination the transport capacity in transportation graph where the potential of railway and bus transport in Bulgaria is rated.
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Papers by Krasimira Stoilova