Wireless sensor networks (WSN) are an ad hoc network consisting of miniaturized autonomous sensors that communicate with each other over a radio link. In this paper, the authors' contribution is a cross-layer approach. To achieve this approach, the authors proposed in the first part an improvement of LEACH algorithm named WEIGHTED_LEACH. This…

Classroom activity traditionally takes one of three forms, variously oriented toward the levels of individual students, small groups, or the whole class. CSCL systems, however, may enable novel ways to facilitate instruction within or sequence activity across these different levels. Drawing on theoretical accounts of learning at and across…

Agile methodologies have become increasingly popular among software developers as evidenced by industrial participation at related conferences. The popularity of agile practices over traditional techniques partly stems from the fact that these practices provide for more customer involvement and better accommodate rapidly changing requirements,…

This paper examines the design and evaluation of a TV on Demand (TVoD) system, consisting of a globally accessible storage architecture where all TV content broadcast over a period of time is made available for streaming. The proposed architecture consists of idle Internet Service Provider (ISP) servers that can be rented and released dynamically…

Discusses the distribution of curriculum ideas over the Internet. Considers the need for productivity software for curriculum development by classroom teachers, and introduces "Teacher's Curriculum Assistant," software designed for this purpose. Describes a constructivist curriculum and provides an example of a problem-solving…

Describes Internet use for electronic mail projects in elementary education. Discusses typing directly versus composing offline, and the effect of electronic letter-writing activities on improving grammar, spelling, social studies, science, and mathematics skills. (AEF)