1,721,076 research outputs found
Attentive monitoring of multiple video streams driven by a Bayesian foraging strategy
Full text linkIn this paper we shall consider the problem of deploying attention to subsets of the video streams for collating the most relevant data and information of interest related to a given task. We formalize this monitoring problem as a foraging problem. We propose a probabilistic framework to model observer’s attentive behavior as the behavior of a forager. The forager, moment to moment, focuses its attention on the most informative stream/camera, detects interesting objects or activities, or switches to a more profitable stream.
The approach proposed here is suitable to be exploited for multi-stream video summarisation. Meanwhile, it can serve as a preliminary step for more sophisticated video surveillance, e.g. activity and behavior analysis. Experimental results achieved on the UCR Videoweb Activities Dataset, a publicly available dataset, are presented to illustrate the utility of the proposed technique
A software architecture for distributed organization management
No full textIn large organizations, management of large amounts of knowledge is a common problem. This knowledge is usually available in a distributed environment, in structured or non-structured form, and often is not exactly known where it is located and how to retrieve it in flexible ways. This paper describes an architecture to manage typical activities for an organization such as our University. During system analysis and specification, we had to collect a lot of information about structure and content of our organization. information available in various formats and media and not always automatically collectable. Hence, we designed a Document-based Software Architecture to support systems where formalization of information repositories, standardization of information location and management of every aspect involved in distributed contexts are crucial needs. We discuss if the configuration of a central-knowledge centered organization is the right solution or if it is better the choice of a distributed one. Since, all the documents managed in any organization are usually available in a structured way, we foresee a strong usage of XML documents and metadata standard definitions
Copper complexes as anticancer agents
No full textMetal-based antitumor drugs play a relevant role in antiblastic chemotherapy. Cisplatin is regarded as one of the most effective drugs, even if severe toxicities and drug resistance phenomena limit its clinical use. Therefore, in recent years there has been a rapid expansion in research and development of novel metal-based anticancer drugs to improve clinical effectiveness, to reduce general toxicity and to broaden the spectrum of activity.
The variety of metal ion functions in biology has stimulated the development of new metallodrugs other than Pt drugs with the aim to obtain compounds acting via alternative mechanisms of action. Among non-Pt compounds, copper complexes are potentially attractive as anticancer agents. Actually, since many years a lot of researchers have actively investigated copper compounds based on the assumption proposal that endogenous metals may be less toxic.
It has been established that the properties of copper-coordinated compounds are largely determined by the nature of ligands and donor atoms bound to the metal ion. In this review, the most remarkable achievements in the design and development of copper(I, II) complexes as antitumor agents are discussed. Special emphasis has been focused on the identification of structure-activity relationships for the different classes of copper(I, II) complexes. This work was motivated by the observation that no comprehensive surveys of copper complexes as anticancer agents were available in the literature. Moreover, up to now, despite the enormous efforts in synthesizing different classes of copper complexes, very few data concerning the molecular basis of the mechanisms underlying their antitumor activity are available. This overview, collecting the most significant strategies adopted in the last ten years to design promising anticancer copper(I, II) compounds, would be a help to the researchers working in this field
X-ray, NMR, and theoretical studies of the nootropic agent BMY-21502, a pyrrolidinone derivative
No full textThe preferred crystalline, solution, and in vacuo arrangements of 1-[[1-[2-(trifluoromethyl)-4-pyrimidinyl]-4-piperidinyl]methyl]-2-pyrrolidinone (BMY-21502) were investigated by means of single-crystal X-ray diffraction, H-1 and C-13 NMR spectroscopy, and semiempirical molecular orbital and molecular mechanics calculations. The X-ray powder diffraction pattern is also reported
A new phase of bis[2-(diphenylphosphino-κP)phenylazanido-κN](ethanolato)(oxo)rhenium(V)
No full textThe title compound, [Re(C18H15NP)2(C2H5O)O], was synthesized by the oxidation-substitution reaction of [Re(III)(PNH)2(PNH2)]Cl, where PNH2 is 2-(diphenylphosphino)phenylamine, with NEt3 in EtOH. The X-ray diffraction study of this new triclinic phase, designated beta, confirms the molecular structural details for the monoclinic a isomer, which crystallized in space group P2(1)/c with a = 12.056 (3), b = 26.303 (6), c = 11.005 (3) angstrom, beta = 102.32 (2)-degrees [Refosco, Tisato, Bandoli, Bolzati, Dolmella, Moresco & Nicolini (1993). J. Chem. Soc. Dalton Trans. pp. 605-618]
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