Elysium Technologies Private Limited
ISO 9001:2008 A leading Research and Development Division
Madurai | Chennai | Kollam | Ramnad | Tuticorin | Singapore
#230, Church Road, Anna Nagar, Madurai 625 020, Tamil Nadu, India
(: +91 452-4390702, 4392702, 4390651
Website: www.elysiumtechnologies.com,www.elysiumtechnologies.info
Email: info@elysiumtechnologies.com
A b s t r a c t
Web Services
2010 - 2011
01
A Promotion Mechanism for Scalable Stealth DHT
Most Distributed Hash Tables (DHTs) inherently assume interconnecting nodes with homogeneous capabilities. Realistically however,
capabilities of nodes on a network widely vary, leading traditional DHTs to inevitably exhibit poor performance in real-world
environments. Stealth DHT was previously proposed to address node heterogeneity by enabling a DHT to separate highly capable
(super-peers or service) nodes from less capable (stealth) nodes. Stealth DHTs are considered robust and flexible due to the way they
organize nodes on the network. However, it is difficult to overprovision the number of service nodes to support unexpected increase
in user requests in the networks. Unlike traditional DHTs therefore, Stealth DHTs cannot guarantee network scalability. In this paper,
we address this problem by proposing a simple promotion mechanism to extend Stealth DHT to use stealth nodes as back-up
resources that it can use when the network is overloaded. We define promotion of stealth nodes as the act of enabling stealth nodes
execute some or all of the operations of service nodes. Experiments results show that the proposed promotion mechanism can
offload significant proportion of network load.
02
A Model-driven Approach to SKOS Implementation
Simple Knowledge Organization System (SKOS) has been recently adopted by the W3C as a standard to support the representation,
use and interoperability of different types of structured controlled vocabularies, such as thesauri, taxonomies or classification
schemes. In this