Advanced Technologies and Applications in Ad Hoc and Sensor Wireless Networks
Ilsun You, Fang-Yie Leu and Leonard Barolli
Wireless networks are playing more and more important roles in people’s life. Ad hoc and sensor networks are expected to be the most promising area of wireless network applications, and accordingly have been gaining tremendous attention from researchers all over the world in recent years. However, a lot of new challenges, which go much beyond conventional network systems, still need to be solved for advanced applications. This special issue is to foster the dissemination of high quality research results on routing, service oriented sensor network model, security, network coverage, fault tolerance and applications in sensor networks as well as in vehicle networks.
This special issue grew out of selected best papers from the 4th International Workshop on Intelligent, Mobile and Internet Services in Ubiquitous Computing (IMIS 2010), held in Krakow, Poland. This event was an effort to take up the challenges and to bring together an international community in the area.
The first paper , “MNPP: Mobile Network Prefix Provisioning for Enabling Route Optimization in Geographic Vehicular Networks” by Jong- Hyouk Lee, Manabu Tsukada, Thierry Ernst, introduces a mechanism for route optimization, named as Mobile Network Prefix Provisioning (MNPP). MNPP enables a vehicle to provision its mobile network prefix assigned to its equipments to neighbor vehicles so that the neighbors are able to send data packets directly to the equipments of the vehicle.
The next paper , “Service-Oriented Wireless Sensor Networks and An Energy-Aware Mesh Routing Algorithm” from Feilong Tang, Minyi Guo, Song Guo and Shui Yu, proposes a service-oriented wireless sensor networks architecture model together with a design of a lightweight middleware, and develops an energy-aware mesh routing algorithm and a multi-layer authentication mechanism.
In the third paper  entitled “Performance Evaluation of Pre-authenticated Handover across Gateways in Vehicular Networks”, Juan A. Martinez and Pedro M. Ruiz analyze the impact of a pre-authentication scheme in VANET environments, and evaluate its performance under inter-urban and urban scenarios and comparing it with the traditional scheme. Their results show that pre-authentication can reduce end-to-end delay and increase the overall packet delivery ratio.
The next paper entitled “Maximizing Network Lifetime for Connected and Non-overlapped Target Coverage in Wireless Sensor Networks” by Yong-Hwan Kim, Youn-Hee Han, proposes both a new graph model and a sensor energy consumption model. Based on the proposed graph and energy consumption models, the authors create a new problem CNTC (Connected and Non-overlapped Target Coverage), and then design a heuristic algorithm SPT (Shortest Path based on Targets) to solve the CNTC problem.
In the last paper  with the title “Sensing Fault Tolerance by Quartile and Outlier Method in Multi-Hops Wireless Sensor and Actor Networks”, Chiu- Ching Tuan, Yi-Chao Wu, Wei-Shiou Chang and Wen-Tzeng Huang propose a sensing fault tolerance by quartile and outlier method (SFTQOM) to mitigate incorrect actions caused from the fault sensed data. SFTQOM could determine the range of the correct data and discard the fault sensors in advance, improving the accuracy of detected data than other sensing fault tolerance mechanisms.
We would like to thank the authors of above papers published in this special issue, and regret that more papers could not be included. We appreciate all reviewers for their time and effort with reviewing assigned papers on time and providing invaluable comments and suggestions for authors for improving their papers. We also want to thank Professor Ivan Stojmenovic, Editors-in-Chief of AHSWN. His generous help and support have made this special issue a reality.
Hopefully, this special issue will bring forth advancements in science and technology as well as improve practices and applications of ad hoc and sensor networks.
 Lee, J. H., Tsukada, M. and Ernst, T. (2010). MNPP: Mobile Network Prefix Provisioning for Enabling Route Optimization in Geographic Vehicular Networks. Ad Hoc & Sensor Wireless Networks, 2010.
 Tang, F. L., Guo, M. Y., Guo S. and Yu, S. (2010). Service-Oriented Wireless Sensor Networks and an Energy-Aware Mesh Routing Algorithm. Ad Hoc & Sensor Wireless Networks, 2010.
 Martinez, J. A. and Ruiz, P. M. (2010). Performance Evaluation of Pre-authenticated Handover across Gateways in Vehicular Networks. Ad Hoc & Sensor Wireless Networks, 2010.
 Kim, Y. H., Han, Y. H. (2010). Maximizing Network Lifetime for Connected and Nonoverlapped Target Coverage in Wireless Sensor Networks. Ad Hoc & Sensor Wireless Networks, 2010.
 Tuan, C. C., Wu, Y. C., Chang, W. H. and Huang, W. T. (2010). Sensing Fault Tolerance by Quartile and Outlier Method in Multi-Hops Wireless Sensor and Actor Networks. Ad Hoc & Sensor Wireless Networks, 2010.