Alternative Transportation Energy

Transportation energy issues are moving to the forefront of the public consciousness in the U.S. and particularly California, and gaining increasing attention from legislators and regulators. The three principal concerns motivating interest in transportation energy are urban air quality, oil dependence, and the threat of global warming. Transportation fuels are a principal contributor to each of these. The transportation sector, mostly motor vehicles, contributes roughly half the urban air pollutants, almost one-third of the carbon dioxide, and consumes over 60% of all petroleum

Detection and Diagnosis of Small Changes in Nonlinear

In this paper, we describe a general approach for detecting small changes, which can be applied to a wide class of nonlinear systems, and which can manage with a reduced order and biased signature of the monitored system. We show how to implement this general approach for solving a real problem, namely the monitoring of the combustion chambers of a gas turbine. Furthermore, we also describe a statistical method for solving the problem of diagnosing the detected changes in the combustion chambers

フリーソフトウェアを用いた動画配信システムの開発と応用

本稿では、フリーソフトウェアを用いて、Web上でのリアルタイムストリーミング動画配信システムの開発をおこなった。現在のWeb上では、様々な形でストリーミング配信がおこなわれているが、その配信に用いるコミュニケーションサーバは高価であることや、他言語との連携が難しいなど、拡張性の面でも問題がある。そのため、今回はフリーソフトのコミュニケーションサーバであるRed5と、Flash互換のOpenlaszloを用いたストリーミング配信システムを開発した。そして、Web会議システムや、動画メールシステムへの応用を試みた

Elastic modulus of nanomaterials: resonant contact-AFM measurement and reduced-size effects (invited lecture)

Resonant contact atomic force microscopy (resonant C-AFM) is used to quantitatively measure the elastic modulus of polymer nanotubes and metallic nanowires. To achieve this, an oscillating electric field is applied between the sample holder and the microscope head to excite the oscillation of the cantilever in contact with the nanostructures suspended over the pores of a membrane. The resonance frequency of the cantilever with the tip in contact with a nanostructure is shifted to higher values with respect to the resonance frequency of the free cantilever. It is demonstrated that the system can simply be modeled by a cantilever with the tip in contact with two springs. The measurement of the frequency shift enables the direct determination of the spring stiffness, i.e. the nanowires or nanotube stiffness. The method also enables the determination of the boundary conditions of the nanobeam on the membrane. The tensile elastic modulus is then simply determined using the classical theory of beam deflection. The obtained results for the larger nanostructures fairly agree to the values reported in the literature for the macroscopic elastic modulus of the corresponding materials. The measured modulus of the nanomaterials with smaller diameters is significantly higher than that of the larger ones. The increase of the apparent elastic modulus for the smaller diameters is attributed to the surface tension effects. It is thus demonstrated that resonant C-AFM enables the measurement of the elastic modulus and of the surface tension of nanomaterials.Anglai

A pattern methodology to specify usable security in Web sites

This paper presents an overview of a new pattern methodology which is oriented to achieve basic usability and security design requirements in websites. We emphasize the need of adequate and uniform guidelines useful to incorporate essential security and usability aspects in websites. In order to diminish this problem a methodology is provided to developers with guidance in designing a trustworthy environment through an effective feedback in case of a security issue are explicitly incorporated in the development life cycle. Our proposal integrates several collections of design patterns (based on HCI-S design criteria), complemented with measurement models (based on Goal Question Metrics, GQM, approach) to evaluate the obtained results.Anglai