-----------------------------------------------------------------
Speaker:        Weilian Su
                Research Assistant
                Broadband and Wireless Networking Laboratory
                School of Electrical and Computer Engineering
                Georgia Institute of Technology
                USA

Date:           Wednesday, 27 November 2002

Time:           2:00 pm - 4:00pm

Venue:          Room 2404 (Phase I, via lift nos. 17/18)
                HKUST


*********************************************************************
                        ABSTRACT  (I)
*********************************************************************

Topic:          "A Stream Enabled Routing (SER) Protocol for
                 Sensor Networks"

As the number of communication components can be integrated into a single
chip increases, the possibility of high volume but low cost sensor nodes
is realizable in the near future.  Each sensor node can be designed to
perform a single or multiple sensing operations, e.g., detecting
temperature, seismic activity, object movement, and environmental
pollution.  As a result, a routing protocol must provide the quality of
service (QoS) needed by the sensor nodes. A new routing protocol called
Stream Enabled Routing (SER) is proposed to allow the sources choose the
routes based on the instruction given by the sinks.  It also takes into
account the available energy of the sensor nodes. Also, SER allows the
sink to give new instruction to the sources without setting up another
path. Sources are the sensor nodes in the sensor field that are performing
the sensing task.  As a result, an interactive user-to-sources
communication is achieved. In addition, the routing protocol is shown
mathematically to perform well in the sensor network environment.



************************************************************************
                        ABSTRACT  (II)
************************************************************************

Topic:          "Time-Diffusion Synchronization Protocol for
                 Sensor Networks"

In the near future, small intelligent devices will be deployed in homes,
plantations, oceans, rivers, streets, and highways to monitor the
environment.  These devices require time synchronization, so voice and
video data from different sensor nodes can be fused and displayed in a
meaningful way at the sink. Instead of time synchronization between just
the sender and receiver during an application like in the Internet, the
sensor nodes in the sensor field have to maintain a similar time within a
certain tolerance throughout the lifetime of the network. The
Time-Diffusion Synchronization Protocol (TDP) is proposed as a
network-wide time synchronization protocol.  It allows the sensor network
to reach an equilibrium time and maintains a small time deviation
tolerance from the equilibrium time.  The TDP is analytically shown that
it can achieve a tolerance precision in the order of microseconds and
nanoseconds given that hardware is fast enough to process the timing
information messages in the order of microseconds and nanoseconds,
respectively.  Simulations have shown that the TDP enables the time in the
network to reach an equilibrium time with the targeted tolerance
precision.  In addition, the energy consumption is evenly spread out to
all the sensor nodes in the sensor field.



*********************
Biography:

Weilian Su received the B.S. degree in Electrical, Computer, and Systems
Engineering (ECSE) from Rensselaer Polytechnic Institute in 1997 with
Summa Cum Laude and ECSE department's Lockheed Martin Capstone Design
Award.  He also received his M.S.E.C.E degree in Electrical and Computer
Engineering from Georgia Institute of Technology in 2001.

Weilian was a Research Assistant at Rensselaer Polytechnic Institute. He
developed and analyzed algorithms using wavelet transform for flaw
detection. Weilian also developed an adaptive network fault detection
algorithm which helped to predict network faults. He was also a Research
Assistant at Jet Propulsion Laboratory (JPL). At JPL, he developed and
analyzed image compression algorithms utilizing Huffman coding and Wavelet
transform. Weilian was an ASIC Application Engineer, Communication Segment
Microelectronics Division, at IBM for two years. He guided customers from
the beginning of the design phase to prototypes and manufacturing of their
chips. Currently, he is a Research Assistant in the Broadband and Wireless
Networking Laboratory pursuing his Ph.D. degree.



                For enquiries, please call 2358 7008
                  **** ALL are Welcome ****
------------------------------------------------------------------------------