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Budapest, Hungary

Molnar B.,Eotvos University of Budapest | Szabo G.,Dennis Gabor College
Proceedings of the International Conference on Information Technology Interfaces, ITI | Year: 2011

The competition on the market enforces companies to adapt to the changing environment. Most recently, economic and financial crisis accelerates the alteration of both business and IT models of enterprises. The forces of globalization and internationalization motivate the restructuring the business processes then consequently IT processes. To depict the changes in a unified framework, we need the concept of enterprise architecture as a theoretical approach that deals with the various tiers, aspects and views of business processes and different layers of application, software and hardware systems. The research carried out up to now unraveled the typical structural changes, the models for internal business networking and their modification reflects the centralization, decentralization and hybrid approaches. Based on the results achieved recently by investigation future research program are drawn up to deepen our understanding the trends within the world of ERP systems. Source


Mezey P.G.,Memorial University of Newfoundland | Mezey P.G.,Eotvos University of Budapest
Journal of Mathematical Chemistry | Year: 2012

Latent molecular properties are not exhibited by the given molecular structure but are reproducibly exhibited by the same molecule in a different electronic state or if some molecular interactions have taken place. A consequence of the Holographic Electron Density Theorem, as applied to latent properties, provides a framework that allows an extension of the expectation value formalism, leading to "unexpected" expectation value expressions for latent properties. Connections of special cases of this approach to earlier density matrix extrapolation methods are pointed out. © 2011 Springer Science+Business Media, LLC. Source


Simon E.,Memorial University of Newfoundland | Mezey P.G.,Memorial University of Newfoundland | Mezey P.G.,Eotvos University of Budapest
Journal of Mathematical Chemistry | Year: 2012

A special adaptation of the fragment shape variation index approach is applied to a series of rod-like structures obtained by replacing all C-C atom pairs by B-N atom pairs in linear polymers constructed by stacking adamantane units on top of each other. A special feature of these structures is a systematic, monotonic increase of the length of B-N bonds roughly parallel with the axis of the rods when moving from the B-terminus towards the N-terminus of the rods. All other changes in the unit cells of these short polymers are less important and less systematic, consequently, focusing on these B-N bonds of the given structures is especially suitable for the application of the fragment shape variation index approach used for a single type of internal coordinate shape descriptor. The results reveal additional trends which are easy to miss if one is restricted to a simple inspection of the data. The study also confirms that in special cases one may replace the detailed electron density shape descriptors with the far simpler bond length data as formal, but limited shape descriptors, whenever the overall structures and shapes show only minor changes, affecting primarily only one type of the internal coordinates. © 2011 Springer Science+Business Media, LLC. Source


Mezey P.G.,Memorial University of Newfoundland | Mezey P.G.,Eotvos University of Budapest
Journal of Mathematical Chemistry | Year: 2012

For a specific functional group, considered as a molecular fragment, the rest of the molecule produces a range of interactions which influence various properties of the functional group. Considering a family of molecules with the "same" functional group, the range of variations in properties determines the range of chemical reactivity of the functional group, and a similar conclusion is valid for more general molecular fragments. By the application of conventional as well as more advanced indices of fragment properties, including local electron density shape characterization, various shape variation indices can be introduced for fragments, and their relations to the holographic properties of electron densities can be examined. © 2011 Springer Science+Business Media, LLC. Source


Antal Z.,Memorial University of Newfoundland | Mezey P.G.,Memorial University of Newfoundland | Mezey P.G.,Eotvos University of Budapest
Journal of Mathematical Chemistry | Year: 2012

The fragment shape variation index approach is applied to intramolecular interactions involving C6 aromatic molecular fragments in the special case where the shape-modifying interactions are also caused primarily by other C6 aromatic fragments of the same molecule. This report is a part of a series of studies aimed at the detailed modeling of various components of intramolecular interactions among molecular fragments, including aromatic ring interactions, aromatic ring and non-aromatic conjugated and non-conjugated system interactions, and more general through-space and through-bond interactions. The ultimate purpose of these studies is a better understanding of the electron density shape modifying effects of intramolecular interactions. © 2011 Springer Science+Business Media, LLC. Source

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