The Totem protocol supports the maintenance of consistency of replicated information in fault-tolerant distributed systems by providing reliable totally ordered delivery of messages. The membership algorithm of Totem maintains a consistent view of processors in a local-area network and handles all aspects of reconnguration, including restarting of failed processors and remerging of partitioned ...

In order to fulfil its physics programme the TOTEM experiment1 has to cope with the challenge of triggering and recording events in the very forward region with a good acceptance for particles produced at very small angles with respect to the beam. The evaluation of the total cross section with an error down to 1÷2% will in particular require the simultaneous measurement of the elastic scatteri...

It is being proved that the neurochip Totem is a viable solution for high quality and real time computational tasks in HEP, including event classification, triggering and signal processing. The architecture of the chip is based on a ”derivative free” algorithm called Reactive Tabu Search (RTS), highly performing even for low precision weights. ISA, VME or PCI boards integrate the chip as a copr...

The Totem system supports fault-tolerant applications in which distributed processes cooperate to perform a commontask and in which replicated data must be updated consistently in the presence of asynchrony and faults. Reliable totally ordered delivery of messages to processes within process groups is provided on a single local-area network or over multiple local-area networks interconnected by...

The first double diffractive cross-section measurement in the very forward region has been carried out by the TOTEM experiment at the LHC with a center-of-mass energy of sqrt[s]=7  TeV. By utilizing the very forward TOTEM tracking detectors T1 and T2, which extend up to |η|=6.5, a clean sample of double diffractive pp events was extracted. From these events, we determined the cross section σDD=...

A class A/B BiCMOS power op-amp designed to drive the L/R load of a disk drive head actuator is presented. The amplifier uses totem pole NMOS outputs instead of bipolar devices to avoid the high collector resistance in the simplified process used. A unique floating buffer technique regulates the quiescent totem pole current of the output devices and provides control for deep triode NMOS operati...

This paper presents the TOTEM framework for supporting the content creation and structuring for location-based games. Shapes (templates), Marbles (instances) and Pebbles (raw data) build the conceptual background while two integrated tools support the overall workflow: TOTEM.Designer, a web-application that allows for desktop-based authoring and TOTEM.Scout, a mobile app that allows for in-situ...

Group communication protocols greatly simplify the design of fault-tolerant distributed systems. Most of those protocols focus on node redundancy rather than on network redundancy. The Totem Redundant Ring Protocol allows the use of multiple redundant local-area networks. The partial or total failure of a network remains transparent to the application processes. The distributed system remains o...