152 research outputs found
Mixed Poisson process with Min-U-Exp mixing variable
No full textThis work continues the research done in Jordanova and Veleva (2023) where the history of the problem could be found. In order to obtain the structure distribution of the newly-defined Mixed Poisson process, here the operation max is replaced with min . We start with the definition of Min-U-Exp distribution. Then, we compute its numerical characteristics and investigate some of its properties. The joint distribution of the inter-arrival times (which are dependent) is the Multivariate Exp-Min-U-Exp distribution of kind. Its univariate and multivariate versions are described, and the formulae for their numerical characteristics are obtained. The distribution of the moments of arrival of different events is called Erlang-Min-U-Exp. Different properties of these distributions are obtained, and their numerical characteristics are computed. Multivariate ordered Mixed Poisson-Min-U-Exp distribution describes the joint distribution of the time-intersection of a Mixed Poisson process with Min-U-Exp mixing variable. The corresponding distribution of the additive increments (which are also dependent) is the Mixed Poisson-Min-U-Exp one. The considered relations between these distributions simplify their understanding.Work in progress. arXiv admin note: text overlap with arXiv:2307.0979
Sociocultural Specifics of Sofia from 1878 to 1812. Changes and Everyday Life of the New Metropolis
No full textDiplomová práce se zabývá Sofií v letech 1878-1912. Autorka se snažila s historickým
uvedním do problematiky zachytit proměny, ke kterým během tohoto období došlo.The thesis deals with Sofia in the years 1878-1912. The author is trying to
historical introduction to problems capture the changes that haveoccurred during this
period.Fakulta filozofickáDokončená práce s úspěšnou obhajobo
First Workshop on Multimodal e-Coaches
No full textThis preprint follows ACM policy: “Authors who publish with ACM have the freedom to post peer-reviewed pre-print
versions of their papers to personal websites and institutional repositories. They can add a single-click link to their final
published papers, and re-use any portion of their published work with the inclusion of a citation and DOI link. Authors
can also post on any repository legally mandated by the agency funding the research on which the work is based, and on
any non-commercial repository or aggregation that does not duplicate ACM tables of contents/substantially duplicate
an ACM-copyrighted volume or issue” (https://authors.acm.org/author-resources/author-rights.)
2e-Coaches are promising intelligent systems that aims at supporting human everyday life, dispatching
advice through different interfaces, such as apps, conversational interfaces and augmented reality
interfaces. This workshop aims at exploring how e-coaches might benefit from spatially and timemultiplexed
interfaces and from different communication modalities (e.g., text, visual, audio, etc.)
according to the context of the interaction.The NESTORE, SAAM, CAPTAIN, HOLOBALANCE, EMPATHIC, MENHIR, vCare projects are supported by
the European Commission under the Horizon 2020 programmes SC1-PM-15-2017 H2020-MSCA-RISE-2018, and
H2020-1.3.3, respectively through the project grants N.769643, 769661, 769830, 769574, 769872, 823907, 769807.
The authors want to thank their respective Consortia. The opinions expressed in this paper are those of the authors and
are not necessarily those of the project partners or the European Commission
Addressing the rain effects on the ocean scattering: a theoretical model of the ocean surface backscattering coefficient in presence of both wind and rain
No full textAtmospheric rain has a strong impact on spaceborne scatterometer observations at Ku-band and higher frequencies. Several semi-empirical techniques have been developed in the past years to address the rain effects on scatterometer backscattered signal but, a theoretical model is still an open issue [Weissman et al., 2012]. A theoretical model would contribute to establish an accurate approach in deriving winds as well as in studying the sensibility to the rain intensity. It would also ingest the opportunity to develop new techniques to estimate both wind and rain simultaneously. Therefore, in this perspective, the goal of this work is to describe our approach in developing such model.
Here, we have focused on modelling the ocean surface backscattering coefficient in presence of rain. The inclusion of rain attenuation and volume backscattering will be the goal of future works. To describe the surface backscattering coefficient, we have used the Two Scale Model, where a new ocean surface roughness model is proposed to account for the ocean surface modification induced by the rain [Contreras and Plant, 2006]. This new spectrum consists on an extension of the ocean wave spectrum model proposed by Elfouhaily et al., (1997) (hereafter E). However, the E spectrum has been firstly tuned to best match the empirical geophysical model functions (GMF). The tuning strategy has been defined such that it does not depend on any instrumental parameters like frequency, incidence angle or polarization as well as on the different available GMFs, in order to allow the model to work in any conditions. Two main rain effects have been included in this spectrum, such as: the short wave damping according to the theory proposed by Nystuen, (1990) and the generation of the ring waves, as shown by Bliven et al., (1997).
The results of the modeled Normalized Radar Cross Section (NRCS), in non-rainy conditions, show a very good agreement with the GMF developed for the Ku-band QuikSCAT scatterometer, at vertical polarization. Good results are also obtained at C-band, in vertical polarization, using the CMOD5.N GMF for validation but, in this case, some discrepancies can be seen at wind speed higher than 15 m/s so, further investigation are needed. Moreover, at Ku-band, the horizontal polarization shows a bias which increases with the wind speed. This bias can be ascribed to the presence of the steep breaking waves which are known to introduce an additional scattering to the wind wave backscattering coefficient. Future investigations will focus on modeling such additional scattering, according to the theory proposed by Kudryavtsev et al., (2003).
On the other hand, in rainy conditions, the results are consistent to what expected. The Ku-band NRCS increases with the rain rate at low, medium and high winds, demonstrating that the ring waves are the dominant contribution. The rain smooths the directional component of the NRCS at lower winds but does not affects the directional component at moderate and high winds. Moreover, it is shown that the sensibility of the NRCS to rain decreases with the wind speed. Additional tests, using real data, are also planned
Marginal Densities of the Wishart Distribution
No full text2010 Mathematics Subject Classification: 62H10.We consider marginal densities obtained by elimination of non-diagonal elements of a positive definite random matrix with an arbitrary distribution. For a p × p random matrix W such a marginal density is presented by a graph with p vertices. For every non-diagonal element of W, included in the density we draw in the graph an undirected edge between the corresponding vertices. By giving an equivalent definition of decomposable graphs we show that the bounds of the integration with respect to every excluded element of W can be exactly obtained if and only if the corresponding graph is decomposable. The author gives in an explicit form some of the marginal densities of an arbitrary Wishart distribution
La información como instrumento estratégico
No full textLas organizaciones de hoy están en constante evolución y esa evolución las veleva a cambios cíclicos que son determinados por agentes externos e internos. Para mejorar la coordinación interna así como la integración de las unidades orgánicas será necesario entre otras cosas compartir información por medio de intranets y redes de información; sistemas de planeación de recursos de la empresa (ERP) y sistema de administración del conocimient
PERSONAL DATA SECURITY FOR SMART SYSTEMS AND DEVISES WITH REMOTE ACCESS
No full textIssues related to the personal data security of users of smart devices with remote access are discussed in the paper. An empirical study through a structured interview and a web-based survey via e-mail and social media conducted by a specific company is presented. The actions taken by the company to ensure the security and personal data protection of its users and business partners are presented. The company's main activity is designing and constructing automatic systems and electronic devices with remote access
via the Internet. The survey is part of the company's activity to achieve good business results, loyal and accurate corporate policy benefitting all contracting partners and long-term business partnerships
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