Takao Ogura

A distributed restoration algorithm for multiple-link and node failures of transport networks

Fast restoration of broadband optical fiber networks from multiple-link and node failures, as well as single-link failures, is addressed. A distributed restoration algorithm based on message flooding is described. The algorithm is an extension of a previously proposed algorithm for single-link failure. It restores the network from multiple-link and node failures, using multidestination flooding and path route monitoring. Computer simulation of the algorithm verified that it can find alternate paths within 0.5 s, whenever the message processing delay at a node is 5 ms.<<ETX>>

Privacy-Preserving Technology for Secure Utilization of Sensor Data (Extended Abstract)

As the number of scenarios for utilizing sensor data from home appliances, privacy issues such as leakage of private information from sensor data are arising. In this paper, we introduce a new technology, partial decryption, which enables parts of the data to be masked while still encrypted, so other data can be substituted or the encryption key can be changed.