Search results for "ASTER"
showing 10 items of 2223 documents
Robust synchronization and fault detection of uncertain master-slave systems with mixed time-varying delays and nonlinear perturbations
2010
In this paper, the problem of robust synchronization and fault detection for a class of master-slave systems subjected to some nonlinear perturbations and mixed neutral and discrete time-varying delays is investigated based on an H ∞ performance condition. By introducing a descriptor technique, using Lyapunov-Krasovskii functional and a suitable change of variables, new required sufficient conditions are established in terms of delay-dependent linear matrix inequalities to synthesize the residual generation scheme. The explicit expression of the synchronization law is derived for the fault such that both asymptotic stability and a prescribed level of disturbance attenuation are satisfied fo…
Il Master per gli assistenti alla comunicazione nei servizi educativi e formativi: quale percorso per quali bisogni?
2012
Il saggio analizza e valuta il percorso formativo del Master biennale per assistenti alla comunicazione nei servizi educativi e formativi coordinato dalla scrivente. Si fa anche un confronto ed una valutazione tra la prima e la seconda edizione, in un'ottica processuale Si tratta di una valutazione qualitativa e quantitativa che tiene conto della percezione di tutti coloro che hanno partecipato al percorso formativo, ma anche dei risultati di apprendimento raggiunti.
On the Greedy Algorithm for the Shortest Common Superstring Problem with Reversals
2015
We study a variation of the classical Shortest Common Superstring (SCS) problem in which a shortest superstring of a finite set of strings $S$ is sought containing as a factor every string of $S$ or its reversal. We call this problem Shortest Common Superstring with Reversals (SCS-R). This problem has been introduced by Jiang et al., who designed a greedy-like algorithm with length approximation ratio $4$. In this paper, we show that a natural adaptation of the classical greedy algorithm for SCS has (optimal) compression ratio $\frac12$, i.e., the sum of the overlaps in the output string is at least half the sum of the overlaps in an optimal solution. We also provide a linear-time implement…
Distributed and proximity-constrained C-means for discrete coverage control
2018
In this paper we present a novel distributed coverage control framework for a network of mobile agents, in charge of covering a finite set of points of interest (PoI), such as people in danger, geographically dispersed equipment or environmental landmarks. The proposed algorithm is inspired by C-Means, an unsupervised learning algorithm originally proposed for non-exclusive clustering and for identification of cluster centroids from a set of observations. To cope with the agents' limited sensing range and avoid infeasible coverage solutions, traditional C-Means needs to be enhanced with proximity constraints, ensuring that each agent takes into account only neighboring PoIs. The proposed co…
Probabilistic Memristive Networks: Application of a Master Equation to Networks of Binary ReRAM cells
2020
Abstract The possibility of using non-deterministic circuit components has been gaining significant attention in recent years. The modeling and simulation of their circuits require novel approaches, as now the state of a circuit at an arbitrary moment in time cannot be predicted deterministically. Generally, these circuits should be described in terms of probabilities, the circuit variables should be calculated on average, and correlation functions should be used to explore interrelations among the variables. In this paper, we use, for the first time, a master equation to analyze the networks composed of probabilistic binary memristors. Analytical solutions of the master equation for the ca…
Vidolicīna totālā sintēze
2015
Vidolicīna totālā sintēze. Kazak M., zinātniskie vadītāji: Dr. chem. prof. E. Sūna E; Dr. chem. K. Shubin. Maģistra darbs, 53 lappuses, 43 attēli, 1 tabula, 55 literatūras avoti. Latviešu valodā. Maģistra darbs ir veltīts Aspidosperma alkaloīdu grupas pārstāvja vidolicīna stereoselektīvajai totālajai sintēzei. Totālās sintēzes atslēgas stadijas ir augsti diastereoselektīva N-terc-butilsulfinilimīna aldola-tipa reakcija un allijodīda secīga fotoķīmiska izomerizācija-ciklizācija. Svarīgāko starpsavienojumu struktūra un stereocentru absolūtā konfigurācija ir pierādīta ar KMR spetroskopijas un rentgenstaru difrakcijas metodēm.
Nestriktas klasterizācijas metodes un to salīdzināšana
2022
Šis darbs ir veltīts piecām klasterizācijas metodēm: K-vidējo klasterizācijas algoritms, C-vidējo nestriktas klasterizācijas algoritms, iespējamību C-vidējo klasterizācijas algoritms, nestrikto iespējamību C-vidējo klasterizācijas algoritms un iespējamību C-vidējo nestriktas klasterizācijas algoritms. Darbs satur šo algoritmu aprakstu un salīdzināšanu, ņemot par pamatu datu klasterizācijas rezultātus. Ir aprakstīta pieeja iespējamību nestriktas klasterizācijas algoritma vispārinājumam.
Evaluation of interlaminar delaminations in titanium-graphite fibre metal laminates by infrared NDT techniques
2018
Abstract Fibre Metal Laminates (FMLs) describe a number of aerospace-grade layered structural materials where thin metal alloy foils are interleaved with Fibre Reinforced Polymer (FRP) plies. Such material hybridisation at the layer meso-scale poses a challenge for non-destructive testing (NDT). On the other hand, the need for NDT inspection of FMLs arises due to the potential development of interlayers disbonds, both during fabrication or in-service. This work describes the successful implementation of two Infrared-NDT approaches to evaluate a defected FML panel made of Titanium/Graphite (Ti-Gr). One technique is based on the modulation of the deployed heat from a low-cost halogen lamp, to…
Hyperspectral imaging of asteroids using an FPI-based sensor
2021
The compositions of asteroids are of interest for the planetary sciences, mining, and planetary defense. The main method for evaluating these compositions is reflectance spectroscopy. Spectroscopic measurements performed from Earth can not resolve how different materials are distributed on the asteroids, making flyby-- and rendezvous missions necessary for obtaining detailed information. Using the CubeSat platform could reduce the costs of these missions, but it also sets constraints on the payload mass and volume. One small and light instrument capable of producing spatially resolved spectral data is a hyperspectral imager based on the Fabry-Perot interferometer. We propose a method of cal…
Genetic study of the production of sexually dimorphic cuticular hydrocarbons in relation with the sex-determination gene transformer in Drosophila me…
2002
In Drosophila melanogaster, the main cuticular hydrocarbons (HCs) are some of the pheromones involved in mate discrimination. These are sexually dimorphic in both their occurrence and their effects. The production of predominant HCs has been measured in male and female progeny of 220 PGal4 lines mated with the feminising UAS-transformer transgenic strain. In 45 lines, XY flies were substantially or totally feminised for their HCs. Surprisingly, XX flies of 14 strains were partially masculinised. Several of the PGal4 enhancer-trap variants screened here seem to interact with sex determination mechanisms involved in the control of sexually dimorphic characters. We also found a good relationsh…