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Atanas Nikolov,Plamen Peev,Mihail Miletkov 한국마케팅과학회 2022 마케팅과학연구 Vol.32 No.2
The authors examine the effect of the presence of a chief marketing officer (CMO) in the top management team on firm performance and explore the performance implications of the CMO function worldwide by using a data set of publicly traded companies from 93 countries from all continents. The article draws on upper echelons theory and the structure-conduct-performance (SCP) literature and focuses on the differences in performance across public companies contingent on corporate organizational structure complexity, uncertainty avoidance, and the degree of firm globalization. The findings show evidence of a positive effect of CMO presence in the worldwide sample, as well as nuanced pathways of impact, mainly through the effects of organizational structure complexity and country level uncertainty avoidance on the value relevance of the CMO in the corporation.
Fuzzy regression algorithm for the multi-modeling approach
S. Vassileva,T. Trifonov,K. Nikolov 장전수학회 2006 Proceedings of the Jangjeon mathematical society Vol.9 No.1
A non-linear fuzzy regression implementation of the multi-modeling approach for complex systems control and analysis is discussed. The benefits of using fuzzy regression instead of the conventional linear regression are noted. A detailed algorithm for non-linear fuzzy regression is presented as well as the respective software tool.
Pd–Au nanoparticles supported by TiO2 fibers for catalytic NO decomposition by CO
Hyeon Ung Shin,Dinesh Lolla,Zhorro Nikolov,George G. Chase 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.33 No.-
Pd–Au nanoparticles supported by TiO2 fibers were fabricated and assembled into a porous medium. The2–16 nm Pd–Au nanoparticles were randomly dispersed in the titania nanofibers (da = 117 68 nm). Xraydiffraction patterns and X-ray photoelectron spectroscopy verified the formation of Pd–Au particles. Binding energy shifts were detected due to chemical bonding and reduction with hydrazine monohydrate. The fiber media with Pd–Au nanoparticles had greater reactivity in conversion of NO and CO gases than Pdmonometallic catalyst alone, attributed to a lower activation energy of the reaction on the Pd–Au catalystparticles
Physical properties of the HAT-P-23 and WASP-48 planetary systems from multi-colour photometry
Ciceri, S.,Mancini, L.,Southworth, J.,Bruni, I.,Nikolov, N.,D’Ago, G.,Schrö,der, T.,Bozza, V.,Tregloan-Reed, J.,Henning, Th. Springer-Verlag 2015 Astronomy and astrophysics Vol.577 No.-
<P>Context. Accurate and repeated photometric follow-up observations of planetary transit events are important to precisely characterize the physical properties of exoplanets. A good knowledge of the main characteristics of the exoplanets is fundamental in order to trace their origin and evolution. Multi-band photometric observations play an important role in this process. Aims. By using new photometric data, we computed precise estimates of the physical properties of two transiting planetary systems at equilibrium temperatures of ~2000 K. Methods. We present new broadband, multi-colour photometric observations obtained using three small class telescopes and the telescope-defocussing technique. In particular we obtained 11 and 10 light curves covering 8 and 7 transits of HAT-P-23 and WASP48, respectively. For each of the two targets, one transit event was simultaneously observed through four optical filters. One transit of WASP-48b was monitored with two telescopes from the same observatory. The physical parameters of the systems were obtained by fitting the transit light curves with JKTEBOP and from published spectroscopic measurements. Results. We have revised the physical parameters of the two planetary systems, finding a smaller radius for both HAT-P-23?b and WASP48?b, Rb = 1.224 ± 0.037 RJup and Rb = 1.396 ±0.051 RJup, respectively, than those measured in the discovery papers (Rb = 1.368 ± 0.090 RJup and Rb = 1.67 ±0.10 RJup). The density of the two planets are higher than those previously published (ρb ~ 1.1 and ~0.3 ρjup for HAT-P-23 and WASP48, respectively) hence the two hot Jupiters are no longer located in a parameter space region of highly inflated planets. An analysis of the variation of the planet’s measured radius as a function of optical wavelength reveals flat transmission spectra within the experimental uncertainties. We also confirm the presence of the eclipsing contact binary NSVS3071474 in the same field of view of WASP48, for which we refine the value of the period to be 0.459?d.</P>
Physical properties of the WASP-67 planetary system from multi-colour photometry
Mancini, L.,Southworth, J.,Ciceri, S.,Calchi Novati, S.,Dominik, M.,Henning, Th.,Jørgensen, U. G.,Korhonen, H.,Nikolov, N.,Alsubai, K. A.,Bozza, V.,Bramich, D. M.,D’Ago, G.,Figuera Jaimes, R.,Galianni EDP Sciences 2014 Astronomy and astrophysics Vol.568 No.2
Departure from the constant-period ephemeris for the transiting exoplanet WASP-12 b
Maciejewski, G.,Dimitrov, D.,Ferná,ndez, M.,Sota, A.,Nowak, G.,Ohlert, J.,Nikolov, G.,Bukowiecki, Ł.,Hinse, T. C.,Pallé,, E.,Tingley, B.,Kjurkchieva, D.,Lee, J. W.,Lee, C.-U. EDP Sciences 2016 Astronomy and astrophysics Vol.588 No.-
TOWARDS A MODEL OF THE DIGITAL UNIVERSITY : A GENERALIZED NET MODEL FOR PRODUCING COURSE TIMETABLES
A. Shannon,D. Orozova,E. Sotirova,K. Atanassov,M. Krawczak,P. Melo-Pinto,R. Nikolov,S. Sotirov,T. Kim(김태균) 한국지능시스템학회 2008 한국지능시스템학회 학술발표 논문집 Vol.18 No.1
In a series of research papers, the authors have studied some of the most important models of a contemporary universities, such as: the research university, the entrepreneurial university and the digital university and construct their Generalized Net (GN) models. This paper is based on the case-studies of Sofia University, the Technical University of Munich and the University of Edinburgh. The main focus is to put the analysis of the processes of the functioning of a university which effectively integrates Information and Communication Technologies (ICT) in all university activities. A concrete example based on the process of course administration at University of Edinburgh is considered. This university is in a process of developing an integrated information system covering most of the university activities. The opportunity of using GNs as a tool for modeling such processes is analyzed as well.