Wenyu's Home Page (original) (raw)

Welcome to Wenyu's homepage.

I have graduated with my Ph.D. under the supervision ofProf. Henning Schulzrinne in the IRT Lab .

My research areas and interests are:

• QoS measurement and monitoring for Internet multimedia
  • Assessment of VoIP Service Availability in the Current Internet PAM 2003 workshop
  • QoS Evaluation of VoIP End-points ICC 2003 (refined version of NYMAN paper)
  • Quality and Performance Evaluation of VoIP End-points , New York Metro Area Networking Workshop 2002 (previously as NYNET)
  • QoS measurement of Real Time Multimedia services on the Internet , Tech Report CUCS-015-99
  • A refined version of CUCS-015-99 , NOSSDAV 2000
• Performance of traffic aggregation in Voice over IP (VoIP)
  • Analysis of On-Off Patterns in VoIP and Their Effect on Voice Traffic Aggregation and slides , ICCCN 2000
  • An informal (and older) slide for my talk-spurt/silence gap measurement
• VoIP subjective quality testing
  • Comparisons of FEC and Codec Robustness on VoIP Quality and Bandwidth Efficiency , ICN 2002
  • Comparison and Optimization of Packet Loss Repair Methods on VoIP Perceived Quality under Bursty Loss , NOSSDAV 2002
  • Speech Recognition Performance as an Effective Perceived Quality Predictor , IWQoS 2002
• IP telephony signaling ( SIP )
  • Towards Junking the PBX: Deploying IP Telephony , presented Slides at NOSSDAV 2001, and at NYNET workshop.
    This paper is also available in unzipped ps and PDF format.
  • Tech Report version of the NOSSDAV 2001 paper
• Bandwidth measurement in the Internet
  • Detecting and Measuring Asymmetric Links in an IP Network , Tech Report CUCS-009-99
  • The conference paper version of CUCS-009-99, Global Internet 1999 (part of GlobeComm)

Networking tools I wrote:

• UDP trace tool
  It contains both a UDP test agent and a test controller. The controller requests two agents to create a UDP periodic test stream between them, to simulate a CBR VoIP (Constant Bit-Rate, Voice over IP) session. The session can be either 1-way (unidirectional) or 2-way. A 2-way test is just like a Ping (ICMP echo/reply) test. This version (1.3beta) supports authentication based on HMAC-MD5, so that only authorized controllers (who has a shared key of each agent) can create UDP tests.
• hop_speed, a networking tool that measures speed of asymmetric links
  A prototype program that implements the algorithm 2 in my tech report (CUCS-009-99) and Globecomm/Global Internet paper.

Here is a list of Call For Papers in Networking

Courses I have TA'ed:

• Introduction to Software Engineering course , W3156/4156, Spring 1998
• Operating Systems , W4118, Fall 1997
• Introduction to Software Engineering course , W3156/4156, Spring 1997
• Numerical Algorithms and Complexity , W4241, Fall 1996

Suggestions to my homepage are welcome.