A major factor in determining the effectiveness of caching in wireless networks is the cache coherency scheme which maintains consistency between mobile stations (MSs) and the server. Because the wireless channel is inherently a broadcast medium, a cache coherency scheme in which the server broadcasts cache invalidation reports (IRs) containing data update information is suitable. However, one ...

Database outsourcing is an idea to eliminate the burden of database management from organizations. Since data is a critical asset of organizations, preserving its privacy from outside adversary and untrusted server should be warranted. In this paper, we present a distributed scheme based on storing shares of data on different servers and separating indexes from data on a distinct server. Shamir...

States and districts have embraced the goals of standards-based reform, but they have interpreted the rather broad objectives in their own unique ways. Merely setting the mark may not be enough to ensure adequate progress in our nation’s schools, Ms. Goertz warns. Comments Copyright Phi Delta Kappa International. Reprinted from Phi Delta Kappan, Volume 83, Issue 1, September 2001, pages 62-66. ...

1 Challenges in justifying the ICT expenditure The discussion commenced by discussing matters affecting the decisions to spend on ICT by government. Dr Kereteletswe indicated that we need to be in a position to justify to the Ministry of Finance and Development Planning the ICT expenditure. The chairman further added that currently the entire world is recovering from the economic melt-down henc...