OmniStore: Automating data management in a personal system comprising several portable devices

The ever growing amount of data generated and consumed on the move using portable devices gives rise to serious data management issues. The fact that each person may own and is likely to carry several such devices further aggravates this problem. On the other hand, new opportunities for achieving cleverer device interaction emerge due to the increased wireless networking capabilities of wearable and portable devices. This paper introduces OmniStore, a system that combines portable devices and infrastructure-based services to relieve the user from explicit and time consuming file management tasks. Our approach is to let devices communicate with each other as well as with a repository service, in an opportunistic and asynchronous fashion, to perform a variety of file movement and copying actions behind the scenes, which would have typically required considerable explicit user interaction.     

Implementation of an object oriented data model in an information system for water catchment management: Java JDO and Db4o Object Database

Object-oriented technologies are playing increasingly important roles in every level of software application for water resource management and modelling, except for data management levels where the relational logic is still the uncontested choice of information system developers despite the object–relational impedance mismatch. In this paper, we would like to present our experience concerning two different technologies for developing the object-oriented data management layer in information systems for water resources management: (i) the Java solution to obtain transparent persistence, the Java Data Object (JDO) technology; (ii) a purer object solution with a light open source Object Database, Db4o. The process for implementing the two technologies in a Java-based hydro-information system is described, and the two different solutions were analysed and compared.