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Dissertation defence
This document summarizes a student's thesis on deployment techniques in wireless sensor networks. It discusses three techniques studied: indoor robot navigation, debris-flow observation, and environment surveillance. For each application, the document outlines the challenges, problem formulations, deployment procedures, and performance evaluations. It concludes by discussing future work and publications resulting from the thesis research.
Dissertation defence
- 1. Deployment Techniques in WirelessSensor Networks with Guaranteed Coverage and Lifetime Student: Chun-Han Lin Advisor: Prof. Chung-Ta King
- 2. Wireless Sensor Network(WSN) Crossbow Mica2 Sense: light, motion, temperature, magnetic fields, gravity, humidity, vibration, pressure, electrical fields, sound, ... 2 2011/8/11
- 3. Project Testbed http://www.csail.mit.edu/ http://fiji.eecs.harvard.edu /Volcano Harvard moteLab COMMON Sense project http://www2.ece.ohio-state.edu/~ekici/ http://db.csail.mit.edu/ 3 2011/8/11
- 4. Importance of DeploymentTechnique Coverage Detection ratio Connectivity Fault tolerance … Lifetime Energy Maintenance Deployment cost 4 2011/8/11
- 5. Design of DeploymentTechnique Various WSN systems Different requirements Developing 3 techniques Indoor robot navigation Debris-flow observation Environment surveillance 5 2011/8/11
- 6. Indoor Robot Navigation Space navigation Security Housekeeping Delivery Medical … Localization Positioning sensor http://www.worldrobotics.org/ A set of sensors can provide localization service Wireless Infrastructure Coverage 6 2011/8/11
- 7. Challenge Positioning sensor Traditional deployment Full coverage Tradeoff Cost Coverage How Reducing sensor Where Keeping coverage Acceptable error 7 2011/8/11
- 8. Error Model Target model x’= x + d cos(q+r) y’= y + d sin(q+r) q’=(q+r) mod 2p Actual configuration P(f) Configuration error err(f)=max(P(f) – f) |err(f)| =|max(P(f) – f)| =(max((P(x) – x)2 + (P(y) – y)2))1/2 Positioning sensor 8 2011/8/11
- 9. Minimum Deployment-set Problem Minimum Deployment-set Problem (G, Errmax) Width of hallway Width of track … The minimum deployment-set problem is NP-hard Vertex cover problem Deployment procedure Initial construction Refinement Divide and conquer 9 2011/8/11
- 10. Performance Evaluation Size of deployment set Configuration error Chun-Han Lin and Chung-Ta King, "Sensor-Deployment Strategies for Indoor Robot Navigation," in IEEE Transactions on Systems, Man and Cybernetics, Part A: Systems and Humans, vol. 40, pp. 388-398, 2010. 10 2011/8/11
- 11. 農委會水土保持局 Debris-Flow Observation Water course Debris flow Sensor Collecting information Water bank Challenge How to collect information from outside Where Coverage 11 2011/8/11
- 12. Deployment Problem Track Activity region No deployment Information Uniform distribution Coverage Point coverage Area coverage 12 2011/8/11
- 13. Periphery Deployment Problem Periphery Deployment Problem (A, T, R, CPmin) Solvable? Maximal coverage Ideal deployment Upper bound Practical deployment Expected value 13 2011/8/11
- 14. Deployment Procedure Ideal deployment Initial deployment 14 2011/8/11
- 15. Performance Evaluation Size of deployment set Coverage Chun-Han Lin, Huang-Chen Lee and Chung-Ta King, “Periphery Deployment for Wireless Sensor Systems with Guaranteed Coverage Percentage,” submitted to Journal of Systems and Software, 2 nd revision. 15 2011/8/11
- 16. Environment Surveillance Fixed locations Sense Collection Record Analysis How to prolong lifetime? Equipping more energy 16 2011/8/11
- 17. Energy Allocation Uniform battery Long lifetime => huge energy Reducing maximum Customizing sensor Can we use general sensor? Adjustable energy Multiple sensors Multiple battery packs Challenge Energy allocation 17 2011/8/11
- 18. Constrained Multiple DeploymentProblem Constrained Multiple Deployment Problem (G, , B, T) Sense Collection Optimal solution Conservation of flow Energy consumption Optimal goal Cost Bound 18 2011/8/11
- 19. Deployment Procedure 19 2011/8/11
- 20. Performance Evaluation Deployment cost Residual energy Chun-Han Lin, Chung-Ta King, and Ting-Yi Chen, "Constrained multiple deployment problem in wireless sensor networks with guaranteed lifetimes," accepted and to appear in ACM Wireless Networks (WINET). 20 2011/8/11
- 21. Conclusion Analysis 3 applications Indoor robot navigation: guaranteed coverage Debris-flow observation: guaranteed coverage Environment surveillance: guaranteed lifetime Problem formulation Deployment procedure Performance evaluation Future Work Algorithm improvement Complexity of periphery and multiple deployments The results of multiple deployment compare with those of ILP Publication procedure 21 2011/8/11
- 22. Publications JOURNAL PAPERS Chun-Han Lin, Chung-Ta King, and Ting-Yi Chen, “Constrained multiple deployment problem in wireless sensor networks with guaranteed lifetimes,” accepted and to appear in ACM Wireless Networks (WINET). Chun-Han Lin and Chung-Ta King, “Sensor-Deployment Strategies for Indoor Robot Navigation,” in IEEE Transactions on Systems, Man and Cybernetics, Part A: Systems and Humans, vol. 40, pp. 388-398, 2010. Nai.-Luen Lai, Chun-Han Lin, and Chung-Ta King, "Scheduling algorithms and routing structures for efficient convergecast in wireless sensor networks," in International Journal of Pervasive Computing and Communications, vol. 6, pp. 4-18, 2010. CONFERENCE PAPERS Nai-Luen Lai, Chung-Ta King, and Chun-Han Lin, “On Maximizing the Throughput of Convergecast in Wireless Sensor Networks,” in Proceedings of the 3rd international conference on Advances in grid and pervasive computing (GPC), pages 396-408, 2008. Chun-Han Lin, Chung-Ta King, and Hung-Chang Hsiao, “Region Abstraction for Event Tracking in Wireless Sensor Networks,” in Proceedings of the 8th International Symposium on Parallel Architectures, Algorithms and Networks (ISPAN), pages 274-281, 2005. PATENTS Fu-Kuang Yeh, Long-Der Chen, Chung-Ta King, and Chun-Han Lin, "METHOD FOR INFORMATION TRANSMISSION WITH BACKBONE NETWORK AND A POSITION MONITORING SYSTEM FOR MULTIPLE ROBOTIC DEVICES," submitted to USA and ROC Patent Offices, pending. SUBMITTED PAPERS Chun-Han Lin, Huang-Chen Lee and Chung-Ta King, “Periphery Deployment for Wireless Sensor Systems with Guaranteed Coverage Percentage,” submitted to Journal of Systems and Software, 2 nd revision. 22 2011/8/11