LIPS^ is a system for distributed computing using idle-cycles in networks of workstations. The system provides its user with the tuple space based generative communication paradigm of parallel computing as known from the coordination language L I N D A~.The core of the LIPS system is the Fault-Tolerant Tuple Space Machine replicating the tuple space. The implementation, based on the protocols given in [l], is set up on a mutex token based membership protocol for handling crashing and joining tuple space servers, and a closely related total order protocol which establishes a linear order among all tuples. The linear order on tuples is used to speed up replication of reading tuple space accesses and decreases the memo y requirements for message logs. As it is possible to add or remove tuple space servers at runtime, eficiency/reliability can be adjusted to the application needs.
This paper deals with a reverse blocking semiconductor switching device, which is optimized for high power direct AC/AC and Current Source Converters. It gives details on the main parts and design criteria in order to reach a robust device. In this paper, basic characteristics and test results are shown for a 400A, 6500V device and the high Safe Operating Area (SOA) capability of the device is demonstrated.
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