Computing in the RAIN: a reliable array of independent nodes

The RAIN project is a research collaboration between Caltech and NASA-JPL on distributed computing and data-storage systems for future spaceborne missions. The goal of the project is to identify and develop key building blocks for reliable distributed systems built with inexpensive off-the-shelf components. The RAIN platform consists of a heterogeneous cluster of computing and/or storage nodes connected via multiple interfaces to networks configured in fault-tolerant topologies. The RAIN software components run in conjunction with operating system services and standard network protocols. Through software-implemented fault tolerance, the system tolerates multiple node, link, and switch failures, with no single point of failure. The RAIN-technology has been transferred to Rainfinity, a start-up company focusing on creating clustered solutions for improving the performance and availability of Internet data centers. In this paper, we describe the following contributions: 1) fault-tolerant interconnect topologies and communication protocols providing consistent error reporting of link failures, 2) fault management techniques based on group membership, and 3) data storage schemes based on computationally efficient error-control codes. We present several proof-of-concept applications: a highly-available video server, a highly-available Web server, and a distributed checkpointing system. Also, we describe a commercial product, Rainwall, built with the RAIN technology

“Exchange Value: British ‘Scholarship Boys’ in Mid-Twentieth-Century America.”

In the late 1950s and early 1960s a number of British “scholarship boys” traveled to America sponsored by British and American foundations. Their experiences in the United States qualify and complicate existing narratives about upwardly mobile meritocrats. First, Americans regarded these figures in a manner that helped alter their view of themselves. Distinctions that mattered in Britain became less significant in America, though scholarship boys remained shrewd enough to penetrate the veneer of a superficial egalitarianism. National identity became a marker that sidelined residual anxieties about social hierarchy. Second, American prosperity affected the bias against consumerism shared by many British intellectuals during the mid-twentieth century. As professionals supported by government or educational institutions, these visitors differentiated themselves from those in the private sector, which pursued other goals. America exposed scholarship boys to a system that assimilated consumerism without sacrificing professionalism and a commitment to social progress

“Scholarship Boys” in Twilight: The Memoirs of Six Humanists in Post-Industrial Britain

The memoirs of six “scholarship boys”—Richard Hoggart, Frank Kermode, Eric Hobsbawm, Harold Perkin, A. H. Halsey, and Brian Magee—reveal the deeply varied experience of academically gifted working- and lower-middle-class males in the twentieth century. The arc from social outsider to cultural prominence drew upon a commitment to humanism acquired in their youth. Scholarship boys navigated the crosscurrents of post-industrial culture in many ways but shared an unwillingness to accept uncritically the sophisticated reductions of postmodern theory and the “creative destruction” of neoliberal practice. The life writing of these figures reveals the often-concealed subjectivities behind academic success, including the desire in old age to honor the lived worlds of their youth. Humanism remained a continuing though not always dominant strain in post-industrial culture

Dallas Bower: a producer for television's early years, 1936-39

Having worked in the film industry as a sound technician and then director, Dallas Bower (1907-99) was appointed in 1936 as one of two senior producers at the start of the BBC Television service. Over the next three years Bower produced as well as directed many ground-breaking live programmes, including the opening-day broadcast on 2 November 1936; the BBC Television Demonstration Film (1937, his only surviving pre-war production); a modern-dress Julius Caesar (1938), in uniforms suggestive of a Fascist disctatorship; Act II of Tristan and Isolde (1938); Patrick Hamilton’s play Rope (1939), utilising extended single camera-shots camera-shots; numerous ballets, among them Checkmate (1938); and ambitious outside broadcasts from the film studios at Denham and Pinewood. Developing the working practices of producing for the theatre, film industry and radio, Bower was a key figure in defining the role of the creative television producer at the start of the medium. Among his innovations, according to his unpublished autobiographical fragment ‘Playback’ (written 1995), was the introduction of a drawn studio plan for the four cameras employed in all live broadcasts from Alexandra Palace. Using Bower’s writings (among them his 1936 book Plan for Cinema), his BECTU History Project interview, the BBC Written Archives and contemporary industry coverage, this article reconstructs the early development of the role of staff television producer in order to consider the questions of autonomy, agency and institutional constraints at the BBC in the pre-war years

GATE : a simulation toolkit for PET and SPECT

Monte Carlo simulation is an essential tool in emission tomography that can assist in the design of new medical imaging devices, the optimization of acquisition protocols, and the development or assessment of image reconstruction algorithms and correction techniques. GATE, the Geant4 Application for Tomographic Emission, encapsulates the Geant4 libraries to achieve a modular, versatile, scripted simulation toolkit adapted to the field of nuclear medicine. In particular, GATE allows the description of time-dependent phenomena such as source or detector movement, and source decay kinetics. This feature makes it possible to simulate time curves under realistic acquisition conditions and to test dynamic reconstruction algorithms. A public release of GATE licensed under the GNU Lesser General Public License can be downloaded at the address http://www-lphe.epfl.ch/GATE/

Noise Reduction by Fuzzy Image Filtering

A new fuzzy filter is presented for the noise reduction of images corrupted with additive noise. The filter consists of two stages. The first stage computes a fuzzy derivative for eight different directions. The second stage uses these fuzzy derivatives to perform fuzzy smoothing by weighting the contributions of neighboring pixel values. Both stages are based on fuzzy rules which make use of membership functions. The filter can be applied iteratively to effectively reduce heavy noise. In particular, the shape of the membership functions is adapted according to the remaining noise level after each iteration, making use of the distribution of the homogeneity in the image. A statistical model for the noise distribution can be incorporated to relate the homogeneity to the adaptation scheme of the membership functions. Experimental results are obtained to show the feasibility of the proposed approach. These results are also compared to other filters by numerical measures and visual inspection