The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The Ethernet PON (EPON), standardized by the IEEE Ethernet First Mile Alliance, is viewed by many as an attractive solution to deliver very high-speed broadband access. While downstream traffic is broadcasted to all customers, the access of upstream traffic to the fiber has to be arbitrated in order to avoid collisions. This is achieved by designing both a dynamic bandwidth assignment (DBA) that shares...
A large dynamic range and a matching spurious-free response are now common-place requirements for new high-performance radar systems. In addition resistance to high-level out-of-band electromagnetic interference (EMI) is an important consideration. The key radar subsystem determining these characteristics is the analog radar receiver and the analog-to-digital converters (ADC). A Babel of definitions...
This paper presents our clear-air backscattering observations from the lower atmosphere using the high power, high resolution WARLOC millimeter wave (94 GHz) radar developed at the Naval Research Laboratory (NRL) [1]. With a peak power of 70 kW and a 62-dB gain antenna, the WARLOC radar offers more than 30 dB higher sensitivity than typical weather radars at this frequency. In addition, the radar...
The electromagnetic spectrum traditionally used by radar systems is under pressure from the growing global need for wireless communications services. Additional factors, such as the technology shift towards high duty-cycle solid-state transmitters and phased arrays using uniformly illuminated transmit apertures, are making the radar-to-radar electromagnetic interference problem more important than...
Broadband Passive Optical Network (PON) technology is a promising approach to establish a cost-effective access network. It is intended to provide a simple, low cost, scalable solution capable of delivering broadband access to end users, by passively sharing a single optical fibre transmission system between several customers. While downstream traffic is broadcasted to all customers, the access of...
Introduction. - Les anti-inflammatoires non steroidiens inhibiteurs specifiques de la cyclo-oxygenase 2 semblent presenter deux avantages par rapport aux anti-inflammatoires non steroidiens classiques : d'une part l'absence de croisement avec ces derniers, d'ou leur interet pratique en allergologie en cas d'intolerance aux anti-inflammatoires non steroidiens classiques, d'autre part l'absence d'effets...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.