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Simulation for wireless sensor networks has become a challenging exercise due to the hardware design, energy constraints, and deployment of large number of nodes. NS-2 has been widely used in network simulations but does not perform well for wireless sensor networks. This paper provides a comprehensive analysis of the NS-2 simulator based on performance(More)
This paper extends the classical tree similarity measuring method and proposes a definition for cost of tree transformation operations based on the importance of each concept in the entire concept structure and similarity between individual concepts in a knowledge context. We apply the proposed method to ontology comparison where different ontologies for(More)
Software metrics is one of the most active research areas of software engineering. In this paper, a process model for software process metrics is proposed, which defines the roles, activities and related supporting tools and methods for the implementation of software process metrics, and gives an emphasis on the description of the goals, tasks and methods(More)
Budget constraints, technological advances, and a growing elderly population are calling for major reforms in healthcare systems. The publicly managed and community-based independent living service provided for the elderly outside hospitals or long-term care institutions is a trend all over the world so that the healthcare systems would be sustainable in(More)
Spoken language education plays an important role in modern language courses. Computer-based spoken language test systems provide a convenient, efficient and reliable approach to test and assess individual spoken abilities. But most E-Learning systems concern more about written training and test. Existing models and systems do not completely meet special(More)
Semantic integration is crucial for successful collaboration between heterogeneous information systems. Traditional ontology-driven approaches rely on the availability of explicit ontologies. However, in most application domains, this prerequisite cannot be met. In order to address this issue, this paper investigates the theoretical foundation of ontologies(More)
In collaborative enterprise networks, semantic heterogeneity is an important factor that hinders collaboration of various information systems. Ontology-driven semantic integration is an important category of solutions for the semantic integration problem. However, in many domains, there are no explicit and formal ontologies available. This paper proposes to(More)