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The automatic patch-based exploit generation problem is: given a program P and a patched version of the program P', automatically generate an exploit for the potentially unknown vulnerability present in P but fixed in P'. In this paper, we propose techniques for automatic patch-based exploit generation, and show that our techniques can automatically(More)
Wireless sensor networks (WSN), composed of a large number of low-cost, battery-powered sensors, have recently emerged as promising computing platforms for many non-traditional applications. The preloaded code on remote sensors often needs to be updated after deployment in order for the WSN to adapt to the changing demands from the users. Post-deployment(More)
Predictive multiplexed switching is a new approach for building interconnection switches for high performance parallel systems. This approach advocates sacrificing some link bandwidth in return for more efficient network control and simpler connection management. The main idea is to depart from the traditional packet and wormhole switching in favor of row(More)
Postdeployment code dissemination in wireless sensor networks (WSN) is challenging, as the code has to be transmitted via energy-expensive wireless communication. In this article, we propose novel update-conscious compilation (UCC) techniques to achieve energy efficiency. By integrating the compilation decisions in generating the old binary, an(More)
A new Turbo iterative receiver structure is proposed for the uplink multiple-input multiple-output orthogonal frequency division multiple access (MIMO-OFDMA) systems. The space-alternating generalized expectation-maximization (SAGE) algorithm is naturally embedded in the framework of iterative receiver to perform synchronization and detection using the(More)
The multiuser transmission (MUT) is an effective way to eliminate the multiple-access interference (MAI) and the inter symbol interference (ISI) in the downlink channel of TDD-CDMA. In this paper, a novel MUT model is developed. In the model, the MUT combined with smart antennas (SA) is taken to improve the performance of TDD-CDMA in the spatial-temporal(More)
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