Víctor Torres

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Exposure to particulate matter (PM) induces inflammatory cytokines. In the present study, we evaluated the secretion of IL-6 and IL-8 by an airway cell line exposed to PM with a mean aerodynamic size equal to or less than 10 or 2.5 microm (PM10 and PM2.5, respectively) collected in Mexico City, using a modified high-volume sampling method avoiding the use(More)
An epsilon-near-zero graded-index converging lens with planar faces is proposed and analyzed. Each perfectly-electric conducting (PEC) waveguide comprising the lens operates slightly above its cut-off frequency and has the same length but different cross-sectional dimensions. This allows controlling individually the propagation constant and the normalized(More)
The management of multimedia information is a key issue when permissions, protection issues and rights are involved. The appearance of new multimedia description formats, new distribution channels and diverse business models makes it difficult to provide a general solution for performing such management. In this scenario, the description of architectures(More)
Multimedia information management, which implies all steps from creation and production to distribution and consumption, is a complex and challenging research area. To have a secure and trusted system we need to take into account aspects such as digital rights management (DRM), certification, control and security. As current solutions rely on proprietary(More)
Secure and trusted distribution of multimedia content is a key issue for content creators, content providers and distributors, as they want to fight piracy and receive the revenues derived from their creativity work. The provision of trust and protection has not been already solved by the existing multimedia distribution mechanisms. Such mechanisms lie on(More)
Content providers and distributors need to have secured and trusted systems for the distribution of multimedia content with Digital Rights Management (DRM) to ensure the revenues derived from their works. This paper discusses the security mechanisms applied to the implementation of a DRM architecture, regarding the certification and verification of user(More)
†ISCTE/DCTI/ADETTI, Ed. ISCTE, Instituto Superior de Ciências do Trabalho e da Empresa, Dep. Ciências e Tecnologias de Informação, Av. Das Forças Armadas, 1600-082 Lisboa, Portugal ††UPF – Universitat Pompeu Fabra, Departament de Tecnologia, Pg. Circumvallació 8, E-08003 Barcelona, Spain †††UPC – Universitat Polytècnica de Catalunya, Dept. AC, DMAG, Campus(More)
This article offers an analysis of the various methods for implementing interoperable digital rights management platforms. O ne of the most perfect examples of interoperability in the IT world is the Internet. The Internet is a heterogeneous environment in terms of hardware, architectures, and systems; every hardware device or application can exchange(More)
We present a mid-infrared inductor that when applied to an extraordinary transmission hole array produces a strong redshift of the resonant peak accompanied by an unprecedented enlargement of the operation bandwidth. The importance of the result is twofold: from a fundamental viewpoint, the direct applicability of equivalent circuit concepts borrowed from(More)