Dissertations details

  • Gestão de Dados Partilhados em Ambientes de Computação Móvel
  • Jan 2003
  • The widespread use of mobile devices and wireless communications has created a new distributed computing environment, usually called mobile computing environment. Computing systems, including data management systems, must be adapted to address the new and intrinsic characteristics of these environments. This dissertation studies data management for mobile computing, and, in particular, the problems involved in data sharing. To address these problems, we propose the extensive use of semantic information. This dissertation also identifies a set of principles that explore the available semantic information to allow multiple users to share data in a mobile computing environment. We divide these principles into two groups. The first group aims at providing near-permanent read and write data availability in the presence of any connectivity conditions relying on: optimistic replication; partial caching; and operation during cache misses -- blind invocation. The second group deals with concurrent operation relying on: conflict avoidance; log propagation and situation-specific reconciliation; and handling of awareness information. These principles were developed and validated during the design, implementation and evaluation of two data management systems for mobile computing with different characteristics. DOORS is an object repository designed to simplify the development of new asynchronous groupware applications. Mobisnap is a relational database system designed to support typical database applications in a mobile computing environment. The principles identified in this dissertation were applied, in each system, using different data management techniques that explore the available semantic information. These specific techniques are also presented in this dissertation.
  • Faculdade de Ciências e Tecnologia, UNL
  • Nuno Preguiça
  • http://http://asc.di.fct.unl.pt/~nmp/papers/nmp-phd.pdf