Information Systems Development is a process that needs not only technical capabilities but manag... more Information Systems Development is a process that needs not only technical capabilities but management capabilities as well. Managing successfully the development process creates a number of qualitative and quantitative benefits to all being involved (suppliers and customers). On the other hand, managing technical people can be both risky and difficult. The methodology that needs to be followed for successful project management need to be quite flexible, measurable, well documented and well defined. This paper takes into consideration the prime stages and processes of 43 methodologies used mainly for information technology project management and creates a methodological framework for managing the systems development process. The framework is supported by best practices, and has been designed in such a way in order to integrate managerial and engineering principles in an adjustable manner. The structure of this framework allows its implementation to support projects of any type, size, and complexity, managed from any perspective (supplied or customer).
Many systems have a hierarchical structure: computer networks, ecological systems, the economy of... more Many systems have a hierarchical structure: computer networks, ecological systems, the economy of the European Union. The reason for studying hierarchical systems was that direct computation of optimal control solutions for large-scale systems is a rather difficult and time-consuming job. The hierarchical multilevel theory intends to resolve the discrepancy between the complex requirements of the control process and the restrictions on computer power. Decomposition and co-ordination are tools which are applicable in the hierarchical multilevel theory.
A co-ordination strategy in multilevel systems which has non-iterative computational characterist... more A co-ordination strategy in multilevel systems which has non-iterative computational characteristics is presented. A preposition-correction algorithm which allows us to perform limited data transfer between the levels is the foundation. Explicit analytical solutions of steady-state quadratic optimization problems are worked out. This coordination benefits the real-time management of multilevel systems, optimization and the feedback control of steady-state quadratic and convex
Journal of Atmospheric and Solar-Terrestrial Physics, 1998
Computersimulations are carried out to study the ‘sprite’ onset mechanism. Both electrostatic and... more Computersimulations are carried out to study the ‘sprite’ onset mechanism. Both electrostatic and electromagnetic codes are developed to calculate the electric field structure and optical emission intensity between the top of the thundercloud and the ionosphere. The optical emission is composed of two structures. One peaks at 70 km height and its lateral dimension is 50–60 km; the other peaks at 90 km height and the lateral dimension extends beyond 200 km. It is found that the nitrogen first positive band, which has a red colour, dominates over the nitrogen second positive band except at the bottom of the optical emission. The upper part of the optical emission is caused by a horizontally travelling electromagnetic pulse induced by a lightning discharge current. The lower structure is caused by electrostatic effects induced by the unneutralized charge left after the lightning discharge current flows.The electromagnetic codes developed can simulate the self-consistent response of the upper atmosphere to the lightning discharge current. The electrostatic treatment can predict only the optical emission at heights less than ∼80 km. The optical emission intensity has a strong nonlinear dependence on the electric field strength through the enhanced electron density, and is increased for a long discharge path, a large current, and a short pulse. Also, the higher the lightning discharge is initiated, the brighter the optical emission is, because the electrostatic field is stronger for high altitude lightning.
Proceedings of TENCON '93. IEEE Region 10 International Conference on Computers, Communications and Automation, 1993
One step coordination procedure is introduced allowing a real time implementation of the control ... more One step coordination procedure is introduced allowing a real time implementation of the control process. An online operating algorithm is developed, presenting the optimal operating rules of the system
The technological solutions for integration of e-learning content are presented. The integration ... more The technological solutions for integration of e-learning content are presented. The integration concerns information ,resources in the global network applying the,web,service paradigm. 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 programming codes,for web ,service ,integration and ,their invocation ,are presented. Examples ,of
Information Systems Development is a process that needs not only technical capabilities but manag... more Information Systems Development is a process that needs not only technical capabilities but management capabilities as well. Managing successfully the development process creates a number of qualitative and quantitative benefits to all being involved (suppliers and customers). On the other hand, managing technical people can be both risky and difficult. The methodology that needs to be followed for successful project management need to be quite flexible, measurable, well documented and well defined. This paper takes into consideration the prime stages and processes of 43 methodologies used mainly for information technology project management and creates a methodological framework for managing the systems development process. The framework is supported by best practices, and has been designed in such a way in order to integrate managerial and engineering principles in an adjustable manner. The structure of this framework allows its implementation to support projects of any type, size, and complexity, managed from any perspective (supplied or customer).
Many systems have a hierarchical structure: computer networks, ecological systems, the economy of... more Many systems have a hierarchical structure: computer networks, ecological systems, the economy of the European Union. The reason for studying hierarchical systems was that direct computation of optimal control solutions for large-scale systems is a rather difficult and time-consuming job. The hierarchical multilevel theory intends to resolve the discrepancy between the complex requirements of the control process and the restrictions on computer power. Decomposition and co-ordination are tools which are applicable in the hierarchical multilevel theory.
A co-ordination strategy in multilevel systems which has non-iterative computational characterist... more A co-ordination strategy in multilevel systems which has non-iterative computational characteristics is presented. A preposition-correction algorithm which allows us to perform limited data transfer between the levels is the foundation. Explicit analytical solutions of steady-state quadratic optimization problems are worked out. This coordination benefits the real-time management of multilevel systems, optimization and the feedback control of steady-state quadratic and convex
Journal of Atmospheric and Solar-Terrestrial Physics, 1998
Computersimulations are carried out to study the ‘sprite’ onset mechanism. Both electrostatic and... more Computersimulations are carried out to study the ‘sprite’ onset mechanism. Both electrostatic and electromagnetic codes are developed to calculate the electric field structure and optical emission intensity between the top of the thundercloud and the ionosphere. The optical emission is composed of two structures. One peaks at 70 km height and its lateral dimension is 50–60 km; the other peaks at 90 km height and the lateral dimension extends beyond 200 km. It is found that the nitrogen first positive band, which has a red colour, dominates over the nitrogen second positive band except at the bottom of the optical emission. The upper part of the optical emission is caused by a horizontally travelling electromagnetic pulse induced by a lightning discharge current. The lower structure is caused by electrostatic effects induced by the unneutralized charge left after the lightning discharge current flows.The electromagnetic codes developed can simulate the self-consistent response of the upper atmosphere to the lightning discharge current. The electrostatic treatment can predict only the optical emission at heights less than ∼80 km. The optical emission intensity has a strong nonlinear dependence on the electric field strength through the enhanced electron density, and is increased for a long discharge path, a large current, and a short pulse. Also, the higher the lightning discharge is initiated, the brighter the optical emission is, because the electrostatic field is stronger for high altitude lightning.
Proceedings of TENCON '93. IEEE Region 10 International Conference on Computers, Communications and Automation, 1993
One step coordination procedure is introduced allowing a real time implementation of the control ... more One step coordination procedure is introduced allowing a real time implementation of the control process. An online operating algorithm is developed, presenting the optimal operating rules of the system
The technological solutions for integration of e-learning content are presented. The integration ... more The technological solutions for integration of e-learning content are presented. The integration concerns information ,resources in the global network applying the,web,service paradigm. 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 programming codes,for web ,service ,integration and ,their invocation ,are presented. Examples ,of
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Papers by Todor Stoilov