Remote Authentication Dial-In User Service

thumb|upright=2|Schéma d'accès à un serveur RADIUS via un proxy RADIUS (Remote Authentication Dial-In User Service) est un protocole client-serveur permettant de centraliser des données d'authentification. Le protocole RADIUS a été inventé et développé en 1991 par la société Livingston enterprise (rachetée par Lucent Technologies), qui fabriquait des serveurs d'accès au réseau pour du matériel uniquement équipé d'interfaces série ; il a fait ultérieurement l'objet d'une normalisation par l'IETF. Normalisation La dernière version du protocole RADIUS est normalisée par l'IETF dans deux RFC : (RADIUS authentication) et (RADIUS accounting) de . Le successeur du protocole RADIUS pourrait être le protocole Diameter (jeu de mots sur le double du rayon). Le protocole est souvent dénommé AAA (Authentication Authorization Accounting), la phase d'autorisation (définition des droits d'accès) étant accomplie lors de la réponse d'identification (ajout d'attributs au paquet "Authenticat

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Mechanical and electrical characterization of Platinum lines used in sensing devices on polyimide foil

Michela Antonella Barbieri, Danick Briand, Jérôme Courbat, Nico de Rooij

The behavior of Pt thin films on polyimide foil was investigated through tensile and bending tests. They aimed at determining the stability of these conductive pathways when subject to deformation. Such films are used for the fabrication of sensors on plastic foils. During these tests, the behavior of 50 down to 5 μm wide Pt lines was optically and electrically characterized. When the foil was bent with a radius of curvature of 2.5 mm (corresponding to a strain of1%), the resistivity of the Pt layer increased by 4.5%. Agauge factor of 4.45 was found. A further reduction of the radius to 1.25 mm (strain of 2%) led to cracks in the Pt film leading to its loss of electrical conductivity during the experiments. However, when the foil went back to its unbent position, the resistance reached almost its initial value. Complete breakdown occurred for radius smaller than 1 mm. Similar results were observed during tensile tests where breakdown occurred between 2 and 3% of elongation.

2010

Chargement

2D Cantilever Array with Fixed Geometries and Varying Spring Constants for Life Science Applications

Terunobu Akiyama, Nico de Rooij, Sebastian Gautsch, Frédéric Loizeau, André Meister, Peter Vettiger

We present 2D cantilever arrays for parallel AFM and their fabrication process using a silicon nitride cantilever with molded tip as the base element of the array. They are designed either for (i) force indentation onto living cells and stiffness mapping, or (ii) cell-to-cell adhesion test applications. The former needs the cantilevers with 0.03 N/m and the tip radius 50 – 200 nm. The latter requires 3 N/m and 2500 nm, respectively. The technique to fabricate those cantilever arrays with different specifications, without significantly changing the fabrication process, is the core of this work. The parallel AFM system itself has been developed and presented elsewhere (M. Favre, et al., Journal of Molecular Recognition, vol. 24, pp. 446-452, 2011). To obtain cantilevers with different spring constants from a wafer, V-grooves structures along the cantilevers were introduced in the cantilever design. An analytical model and an FEA simulation confirmed that the spring constant can be varied up to two decades by changing the V-groove depth. To obtain a large tip radius required for cell handling, we developed a mold enlarging/rounding step and obtained a tip with a radius up to 4 μm.

Elsevier Science, Reg Sales Off, Customer Support Dept, 655 Ave Of The Americas, New York, Ny 10010 Usa2011

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Two-dimensional cantilever array with varying spring constants and tip radii for life-science applications

Terunobu Akiyama, Nico de Rooij, Sebastian Gautsch, Frédéric Loizeau, André Meister, Peter Vettiger

A fabrication process for realising two-dimensional cantilever arrays for parallel force spectroscopy of biological samples is presented. The parallel optical atomic force microscopy readout system has been developed and presented elsewhere. The arrays are designed either for (i) force-indentation onto living cells to obtain stiffness mapping or (ii) cell adhesion experiments. Both experiments require very different spring constants and tip radii of curvature. The arrays are based on silicon nitride cantilevers with molded tips. The fabrication process includes an advanced molding process and a thermocompression bonding of two silicon wafers. V-groove structures along the cantilevers, which increase the area moment of inertia, were introduced in the cantilever design. This feature enables the fabrication of cantilevers with different spring constants but same footprint from one wafer. An analytical model and experimental results confirmed that the spring constant of the cantilever (200 x 50 x 0.45 mu m) could be increased up to two decades (0.03-5 N/m) by changing the depth of the V-grooves. To realise the large tip radius required for cell adhesion experiments, an enlarging/rounding procedure has been applied to a truncated pyramidal tip mold. With this process, the authors obtained tips with a radius up to 4 mu m.

2012

Chargement

Authentication protocol

An authentication protocol is a type of computer communications protocol or cryptographic protocol specifically designed for transfer of authentication data between two entities. It allows the receiv

Point-to-Point Protocol

Point-to-Point Protocol (PPP, protocole point à point) est un protocole de transmission pour internet, décrit par le standard RFC 1661, fortement basé sur HDLC, qui permet d'établir une connexion entr

Kerberos (protocole)

alt=Principe du protocole Kerberos|vignette|Principe du protocole Kerberos Kerberos est un protocole d'authentification réseau qui repose sur un mécanisme de clés secrètes (chiffrement symétrique) et

MATH-611: Scientific programming for Engineers

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EE-576: Electromagnetic compatibility

In this lecture, students will get the basic knowledge on electromagnetic compatibility.

MICRO-332(b): Manufacturing DLLs (printemps)

The goal of this DLL is to introduce students to both the practical aspects of micro-fabrication of a fully functional device.