Christopher Sadler

New E-Mail Address: cmsadler@gmail.com
Resume (.pdf)


Academics:

I completed my Ph.D. in the Electrical Engineering Department, Computer Engineering division at Princeton University in April 2007. My research focused on mobile ad-hoc sensor networks and my advisor was Professor Margaret Martonosi. Our objectives include reducing energy consumption on individual nodes and throughout the network, improving communication efficiency and reliability, and developing protocols and applications for mobile sensor networks.

In our latest work, we developed a data abstraction layer for mobile sensor networks that reorganizes data from the network's point of view. This structure helps us conserve both energy and bandwidth by making it easy to identify and transmit specific segments of data and by facilitating the development of services for data search and data reduction. Our results were published at MobiSys'07 and are available below.

We also developed a family of basic lossless compression algorithms tailored to static and mobile sensor networks and applicable to a wide range of applications. This work has the potential to drastically reduce network energy consumption. Our results were published at SenSys'06 and are available below (along with our source code).

Additionally, with Professor Martonosi, Professor Steve Lyon, Pei Zhang, Professor Dan Rubenstein (Dept. of Ecology and Evolutionary Biology), and Ilya Fischhoff (EEB), I worked on the ZebraNet project in which our goal is to use peer-to-peer protocols and mobile ad hoc networking technologies to design energy-aware collars to be placed on zebras to help track migrations in ways not possible with current animal tracking technology.

In June 2005, we successfully deployed four collars at the Sweetwaters Game Reserve in central Kenya. Pictures can be found below. This deployment was a follow up to our January 2004 deployment, during which we collared seven zebras. We published papers on our work up to and including that deployment at Mobisys'04 and Sensys'04, and they can be found below.

The mysterious "collared zebra"

Deploying the Collars - June 2005 (all pictures are in Picasa Web Albums):

Exploring Kenya - June 2005:

Preparing for the Deployment - May 2005:

  • First horse test - The collar has been completely redesigned. This is the first major collar iteration and it was put on horse on 5/1/05.

  • Second horse test - By 5/9/05 we had made minor adjustments and wanted to try it out again.

  • Final horse test - On 5/11/05 we settled on our final collar design. This was the last horse test.

Archived Pictures from the January 2004 deployment:

Publications:

  1. C. Sadler (2007) Energy Conservation Techniques in Mobile Delay-Tolerant Sensor Networks. PhD thesis, Princeton University.

  2. C. Sadler and M. Martonosi, “DALi: A Communication-Centric Data Abstraction Layer for Energy-Constrained Devices in Mobile Sensor Networks,” Proceedings of the ACM Conference on Mobile Systems, Applications, and Services (MobiSys) 2007, June 2007. .pdf

  3. C. Sadler and M. Martonosi, “Data Compression Algorithms for Energy-Constrained Devices in Delay Tolerant Networks,” Proceedings of the ACM Conference on Embedded Networked Sensor Systems (SenSys) 2006, November 2006. .pdf.
    S-LZW Source for MSPGCC: slzw.tar.gz. Updated 10 March 2007.
    S-LZW is being used for marine research at NIOZ  (Special thanks to Dirk Buijsman):

  4. P. Zhang, C. Sadler, and M. Martonosi, “Middleware for Long-term Deployment of Delay-tolerant Sensor Networks,” Proceedings of the first International Workshop on Middleware for Sensor Networks (MidSens) 2006, November 2006. .pdf

  5. “Habitat Monitoring with ZebraNet: Design and Experiences”, P. Zhang, C. Sadler, T. Liu, I. Fischhoff, M. Martonosi, S. Lyon, and D. Rubenstein, book chapter in "Wireless Sensor Networks: A Systems Perspective", N. Bulusu and S. Jha (editors), Artech House, 2005.

  6. C. Sadler, L. Kant, and W. Chen, “Cross-Layer Self-Healing Mechanisms in Wireless Networks,” Proceedings of the World Wireless Congress 2005, May 2005. .pdf

  7. P. Zhang, C. Sadler, S. Lyon, and M. Martonosi, “Hardware Design Experiences in ZebraNet,” Proceedings of the ACM Conference on Embedded Networked Sensor Systems (SenSys) 2004, November 2004. .pdf

  8. T. Liu, C. Sadler, P. Zhang, and M. Martonosi, “Implementing Software on Resource-Constrained Mobile Sensors: Experiences with Impala and ZebraNet,” Proceedings of the ACM Conference on Mobile Systems, Applications, and Services (MobiSys) 2004, June 2004. .pdf

  9. B. Luu and C. Sadler, “Experiment protocol boosters over Inmarsat-ISDN communication link,” ARL Technical Report, ARL-TR-3082, October 2003. .pdf

  10. B. Luu and C. Sadler, “Data Transmission over Inmarsat in TCP/IP Environment,” Proceedings of the SPIE's International Symposium on AeroSense 2001, Vol. #4395, pp. 233-239, April 2001. .pdf

Presentations:

  1. “DALi: A Communication-Centric Data Abstraction Layer for Energy-Constrained Devices in Mobile Sensor Networks,” MobiSys 2007, San Juan, Puerto Rico, 12 June 2007. .pdf

  2. “Energy Conservation Techniques in Mobile Delay-Tolerant Sensor Networks,” Final Public Oral Exam (Dissertation Defense), Princeton University, 26 April 2007. .pdf

  3. “Wireless Sensors in the Wild,” Guest Lecture in ELE391: The Wireless Revolution, Princeton University, 14 December 2006.

  4. “Data Compression Algorithms for Energy-Constrained Devices in Delay Tolerant Networks,” SenSys 2006, Boulder, CO, 2 November 2006. Received Best Presentation Award. .pdf

  5. “Hardware Design Experiences in ZebraNet,” SenSys 2004, Baltimore, MD, 5 November 2004. .pdf

Other interests:

Penn State football and Baltimore Orioles baseball keep me occupied 9 months out of the year. Penn State is back!!! Lets Go State!

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