Search results for "key"
showing 10 items of 1962 documents
Urban Surface Energy Balance Models: Model Characteristics and Methodology for a Comparison Study
2009
Many urban surface energy balance models now exist. These vary in complexity from simple schemes that represent the city as a concrete slab, to those which incorporate detailed representations of momentum and energy fluxes distributed within the atmospheric boundary layer. While many of these schemes have been evaluated against observations, with some models even compared with the same data sets, such evaluations have not been undertaken in a controlled manner to enable direct comparison. For other types of climate model, for instance the Project for Intercomparison of Land-Surface Parameterization Schemes (PILPS) experiments (Henderson-Sellers et al., 1993), such controlled comparisons hav…
Supporting Relational Processing in Complex Animated Diagrams
2008
The psychological utility of different approaches to cueing key information within complex animated diagrams remains relatively unexplored. Because of the varied processing demands required to comprehend such representations, it is likely that providing a range of different cue types would be best for supporting effective user information extraction. Traditional cueing approaches used with static diagrams may need to be reconsidered in order to meet the new design challenges associated with their animated counterparts.
Secure Group Communication Using Fractional Public Keys
2010
Published version of a paper presented at the ARES '10 International Conference on Availability, Reliability, and Security (c) 2010 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works. Paper also available from the publisher:http://dx.doi.org/10.1109/ARES.2010.13 In this paper, we present the novel concept of fractional public keys and an efficient zero-round multi-party Diffie-Hellman key agreement sc…
A novel active contour model for unsupervised low-key image segmentation
2013
Published version of an article in the journal: Central European Journal of Engineering. Also available from the publisher at: http://dx.doi.org/10.2478/s13531-012-0050-0 Unsupervised image segmentation is greatly useful in many vision-based applications. In this paper, we aim at the unsupervised low-key image segmentation. In low-key images, dark tone dominates the background, and gray level distribution of the foreground is heterogeneous. They widely exist in the areas of space exploration, machine vision, medical imaging, etc. In our algorithm, a novel active contour model with the probability density function of gamma distribution is proposed. The flexible gamma distribution gives a bet…
Performance analysis of wideband sum-of-cisoids-based channel simulators with respect to the bit error probability of DPSK OFDM Systems
2009
In this paper, we analyze the performance of a wideband sum-of-cisoids (SOC) channel simulator w.r.t. the bit error probability (BEP) of differential phase-shift keying (DPSK) orthogonal frequency division multiplexing (OFDM) systems. Analytical BEP expressions are derived for coherent and non- coherent DPSK OFDM simulation systems in the presence of a wideband SOC channel simulator. We also study the degradations of the BEP introduced by an imperfect channel simulator. Using the deviation of the BEP as an appropriate measure, we evaluate the performance of three parameter computation methods, known as the method of exact Doppler spread (MEDS), the randomized MEDS (R-MEDS), and the Monte Ca…
The Raunis section, central Latvia, revisited: first luminescence results and re-evaluation of a key Baltic States stratigraphic site
2020
This is an Accepted Manuscript version of the following article: Kalińska, E., Alexanderson, H. & Krievāns, M. (2020). The Raunis section, central Latvia, revisited: first luminescence results and re-evaluation of a key Baltic States stratigraphic site. Geografiska Annaler: Series A, Physical Geography, 102(4), 376-396. It is deposited under the terms of the Creative Commons Attribution-NonCommercial License, which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. In interstadial deposits, sand interbeds gain limited consideration in comparison with organic sediments, and therefore tend to be underrepresented in paleoe…
Investigation of data encryption impact on broadcasting visible light communications
2014
Este trabajo investiga el impacto de la encriptación y desencriptación de datos en un sistema de comunicaciones de luz visible (VLC) de difusión en interiores incrustado en la capa física. Se ha implementado el cifrado RSA para proporcionar una transmisión de datos segura en la capa física. El artículo muestra el rendimiento de la tasa de error de bits (BER) para los sistemas VLC seguros y no seguros (8 y 12 bits) para velocidades de datos de 2 y 12 Mbps. Para una BER de 10e-4 mostramos que hay penalizaciones de potencia de 2-4 dB con las VLC seguras. También se investiga el impacto de la longitud de la clave en la propagación del error y la penalización de potencia. EU Cost Action IC1101 T…
Izpildes pamatrādītāju ieviešana Datu apstrādes komandā
2015
Mūsdienās uzņēmumi un organizācijas aizvien vairāk sāk domāt par savu darbinieku zināšanu kapitālu, darba kvalitāti un attiecīgi darbinieku uzdevumu izpildi. Tādēļ maģistra darba autore ir izvēlējusies savā darbā apskatīt izpildes pamatrādītāju sistēmas un iespējas to ieviešanai. Maģistra darba mērķis ir, pamatojoties uz uzņēmuma un datu apstrādes komandas procesu analīzi, identificēt iespējamos izpildes pamatrādītājus par visas komandas darbību un izstrādāt priekšlikumus to ieviešanai. Maģistra darba mērķa sasniegšanai tika izvirzīti sekojoši uzdevumi: •iepazīties ar izpildes pamatrādītāju pieejām un sistēmām, lai spētu izprast to nozīmīgumu un būtību; •novērtēt pamatdatu pārvaldīšanas noz…
Startēģiskās vadīšanas analīze AS "Latvijas Gāze"
2015
Maģistra darbs sastāv no 83 lapaspusēm, 15 attēliem, 4 tabulām, 1 pielikuma, izmantoto literatūras avotu skaits 28. Maģistra darba temats ir ‘’Stratēģiskās vadīšanas analīze AS ‘’Latvijas Gāze’’’’. Maģistra darba mērķis ir izanalizēt stratēģiskās vadīšanas īstenošanu AS ‘’Latvijas Gāze’’, tā rezultātā atklāt īpatnības, priekšrocības un trūkumus, kā arī izstrādāt priekšlikumus stratēģiskās vadīšanas uzlabošanai. Strukturāli darbs sastāv no četrām nodaļām. Pirmajā nodaļā, pamatojoties uz ekonomisko literatūru, tiek raksturota stratēģijas un stratēģiskās vadīšanas būtība, stratēģiskās vadīšanas process, kā arī uzņēmuma stratēģijas nepieciešamība mainīgos tirgus apstākļos. Otrajā nodaļā tiek ve…
A Novel Model for E-Business and E-Government Processes on Social Media
2013
Abstract The global digital economy tends to grow up through the adoption of key technologies, mobility, cloud computing, data mining, artificial intelligence or the extension of social environments. These influences turns up the economy and give rise to new tendencies for obtaining the value. The e-business and e-government strategy is not an easy to organize, although in terms of a fundamental strategy of e-business will be led by the super-expansion of the market. For this reason, the aim of this study is to demonstrate the implications that social media has in the development of electronic business (e-business) and to provide, through a mode, a viable solution to companies or even Gover…