Welcome To The Second International Workshop On Wireless Sensor Networks And Applications (wsna 2003), In San Diego, On September 19, 2003. Wsna 2003, Sponsored By Acm Sigmobile, Is Held In Conjunction With Acm Mobicom 2003 Conference. This Workshop Is A Forum For Researchers And Technologists To Present New And Innovative Research Results In Wireless Sensors, Communication Protocols, And Applications Of Wireless Sensor Networks. The Workshop Is Motivated By Recent Technological Advances Which Have Made It Possible To Design And Build Large-scale Sensor Networks Containing Hundreds To Thousands Of Sensor Nodes. Applications Envisioned For Such Networks Span Several Domains Including Military, Environmental, Medical, Industrial, And Smart In-building Networks. Some Of The Key Challenges Deal With Scaling Protocols To Large Number Of Nodes, And Designing Energy-conserving Protocols And Sub-systems As Well As Appropriate Programming And Querying Languages And Information Extraction Techniques, And Developing Of Exciting New Applications That Exploit The Potential Of Wireless Sensor Networks. Session: Time Synch And Localization. Asymptotically Optimal Time Synchronization In Dense Sensor Networks / An-swol Hu, Sergio D. Servetto --- Lightweight Time Synchronization For Sensor Networks / Jana Van Greunen, Jan Rabaey --- Using Proximity And Quantized Rss For Sensor Localization In Wireless Networks / Neal Patwari, Alfred O. Hero, Iii --- Using Proximity And Quantized Rss For Sensor Localization In Wireless Networks / Neal Patwari, Alfred O. Hero, Iii ---- Session: Systems, Platforms, And Applications. Proximity Interactions Between Wireless Sensors And Their Application / Waylon Brunette, Carl Hartung, Ben Nordstrom, Gaetano Borriello --- Experimental Evaluation Of Synchronization And Topology Control For In-building Sensor Network Applications / W. Steven Conner, Jasmeet Chhabra, Mark Yarvis, Lakshman Krishnamurthy --- Mantis: System Support For Multimodal Networks Of In-situ Sensors / H. Abrach, S. Bhatti, J. Carlson, H. Dai, J. Rose, A. Sheth, B. Shucker, J. Deng, R. Han --- Efficient Code Distribution In Wireless Sensor Networks / Niels Reijers, Koen Langendoen --- Efficient Code Distribution In Wireless Sensor Networks / Niels Reijers, Koen Langendoen --- Efficient Code Distribution In Wireless Sensor Networks / Niels Reijers, Koen Langendoen. Session: Queries And Aggregation. Computation Hierarchy For In-network Processing / Ram Kumar, Vlasios Tsiatsis, Mani B. Srivastava --- Computation Hierarchy For In-network Processing / Ram Kumar, Vlasios Tsiatsis, Mani B. Srivastava --- Cleaning And Querying Noisy Sensors / Eiman Elnahrawy, Badri Nath --- Information-directed Routing In Ad Hoc Sensor Networks / Juan Liu, Feng Zhao, Dragan Petrovic --- Role-based Hierarchical Self Organization For Wireless Ad Hoc Sensor Networks / Manish Kochhal, Loren Schwiebert, Sandeep Gupta ---- Session: Routing, Coverage, And Topology Control. Analysis On The Redundancy Of Wireless Sensor Networks / Yong Gao, Kui Wu, Fulu Li --- The Coverage Problem In A Wireless Sensor Network / Chi-fu Huang, Yu-chee Tseng --- Parametric Probabilistic Sensor Network Routing / Christopher L. Barrett, Stephan J. Eidenbenz, Lukas Kroc, Madhav Marathe, James P. Smith --- Throughput And Energy Efficiency In Topology-controlled Multi-hop Wireless Sensor Networks / Li (erran) Li, Prasun Sinha ---- Session: Security. Fast Authenticated Key Establishment Protocols For Self-organizing Sensor Networks / Qiang Huang, Johnas Cukier, Hisashi Kobayashi, Bede Liu, Jinyun Zhang --- Analyzing And Modeling Encryption Overhead For Sensor Network Nodes / Prasanth Ganesan, Ramnath Venugopalan, Pushkin Peddabachagari, Alexander Dean, Frank Mueller, Mihail Sichitiu. General Co-chairs, Krishna Sivalingam, C.s. Raghavendra ; Technical Program Co-chairs, Parameswaran Ramanathan, Ramesh Govindan. Sponsored By Acm Sigmobile--p. Iii. Acm Order Number 533039--p. Ii. Includes Bibliographical References And Index. Also Available On The World Wide Web Via Acm Digital Library With Title: Proceedings Of The 2nd Acm International Conference On Wireless Sensor Networks And Applications.