Search results for "ERROR"
showing 10 items of 1643 documents
Fuzzy Variable Structure Control for Uncertain Systems with Disturbance
2012
Published version of an article from the journal: Mathematical Problems in Engineering. Also available from the publisher:http://dx.doi.org/10.1155/2012/105074 This paper focuses on the fuzzy variable structure control for uncertain systems with disturbance. Specifically, the fuzzy control is introduced to estimate the control disturbance, the switching control is included to compensate for the approximation error, and they possess the characteristic of simpleness in design and effectiveness in attenuating the control chattering. Some typical numerical examples are presented to demonstrate the effectiveness and advantage of the fuzzy variable structure controller proposed.
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…
Procedūras cīņai ar naudas atmazgāšanu attīstītajās valstīs
2019
Maģistra darba mērķis ir izprast finanšu iestāžu, konkrētāk, banku un starpnieku uzņēmumu atšķirības un attieksmi saistībā ar cīņu pret naudas atmazgāšanu. Precīzāk, šī pētījuma mērķis ir padziļināti izpētīt finanšu iestāžu procedūras un kāpēc daudzas iestādes šo problēmu neuztver tik nopietni. Lai izpētītu šos mērķus, tika veikta virkne analīžu, un izvirzīti galvenie uzdevumi: •Izprast problēmas vēsturisko pamatu •Izpētīt naudas atmazgāšanas un analītiskās sistēmas apkarošanas metodes •Salīdzināt finanšu iestāžu pārstāvju izvēlētās metodes cīņai pret naudas atmazgāšanu Pētījums parādīja, ka ne visas finanšu iestādes sniedz atskaites saistībā ar aizdomīgiem darījumiem. Kā arī šķietami attīs…
Worm-like artifacts in exfoliative cytology.
2006
The presence of worms in cytological smears is occasionally reported, although various other structures exist that may be confused with such parasites. We present eight worm-like artifacts observed in routine Papanicolaou smears. Recognition of these structures is important to avoid overvaluation or confusion with true worms. Diagn. Cytopathol. 2006;34:636–639. © 2006 Wiley–Liss, Inc.
Validation procedures in radiological diagnostic models. Neural network and logistic regression
1999
The objective of this paper is to compare the performance of two predictive radiological models, logistic regression (LR) and neural network (NN), with five different resampling methods. One hundred and sixty-seven patients with proven calvarial lesions as the only known disease were enrolled. Clinical and CT data were used for LR and NN models. Both models were developed with cross validation, leave-one-out and three different bootstrap algorithms. The final results of each model were compared with error rate and the area under receiver operating characteristic curves (Az). The neural network obtained statistically higher Az than LR with cross validation. The remaining resampling validatio…
Perceived collective continuity and ingroup identification as defence against death awareness
2008
"Perhaps unique among the animal species, humans are aware that they will ultimately die. Terror management theory (TMT) posits that investing in a social group helps people to manage paralysing anxiety stemming from death awareness. In line with this proposition, research to date has shown that when reminded of their own mortality, people increase their identification with a relevant group and defend its beliefs, values, and practices. In the reported study, we demonstrate that a mortality salience induction enhances people’s perceptions of group temporal endurance—or perceived collective continuity (PCC), as we define it. Enhanced PCC leads, in turn, to enhanced group identification. This…
Some insights on the link between terrorism, organised crime and ‘new wars’
2014
Purpose - The purpose of this chapter is to investigate on the relationship between terrorism, criminal organisations, and the so-called 'new wars'. Methodology/approach - Review of the existing literature on the 'new wars' and on the terrorism-crime nexus; estimate of the financial revenues gained by terrorist groups engaged in illicit activities. Findings -Terrorist and criminal groups can develop several forms of collaboration. Whether terrorists convert to criminal activities or not depends on a variety of factors, both internal and external. In some cases these links are occasional and opportunistic, associated with the possibility of exploiting the availability of specialised competen…
Commentaries on our new ways of perceiving disasters
2010
PurposeThe purpose of this paper is to help readers gain more understanding of the new phenomena of terror, risk, and threat perception.Design/methodology/approachVarious authors are reviewed: Castel, Beck, Baral, Kellner, Sabada, Korstanje, and in particular, Baudrillard.FindingsSeveral matches are found among the reviewed authors which comprise, for example: late modernity (from 1970 to date) witnesses an increase of fears, panic, and risk assessments in social imaginary; these concerns are part of a process that opens the future to the contingency. That way, the decision‐making process in human beings sheds light on certain aspects of life such as health, body‐care planning but this has …
Retrieval of vegetation height in rice fields using polarimetric SAR interferometry with TanDEM-X data
2017
This work presents for the first time a demonstration with satellite data of polarimetric SAR interferometry (PolInSAR) applied to the retrieval of vegetation height in rice fields. Three series of dual-pol interferometric SAR data acquired with large baselines (2–3 km) by the TanDEM-X system during its science phase (April–September 2015) are exploited. A novel inversion algorithm especially suited for rice fields cultivated in flooded soil is proposed and evaluated. The validation is carried out over three test sites located in geographically different areas: Sevilla (SW Spain), Valencia (E Spain), and Ipsala (W Turkey), in which different rice types are present. Results are obtained duri…
Non-fragile sliding mode control for flexible air-breathing hypersonic vehicles
2012
The non-fragile sliding mode tracking control design problem for a flexible air-breathing hypersonic vehicles (FAHVs) is investigated in this paper. A linearized model is constructed with respect to a trim point for the nonlinear, dynamically coupled simulation model of the FAHVs with external disturbance, then a reference model is designed and a tracking error model is proposed. An integral sliding surface is designed, and then the non-fragile H ∞ controller design problem for the sliding mode dynamics is discussed. sufficient condition is derived for the existence of such a controller in the presence of unmatched disturbance. A SMC law is derived to guarantee the reachability of the speci…