- 1999/05 – present: Principal Researcher/Research Area Manager, Microsoft Research Asia, Beijing, China
Directed and managed the following research groups: Internet Media Group, Wireless and Networking Group, Media Communication Group, Media Computing Group and Visual Computing Group; served as the acting manager of the University Relationship Group; coordinated the research activities across the entire research lab; participated in various academic activities with local universities, academic societies, international conference organizations; directed, managed, led, and conducted research on image and video processing, image and video coding, multimedia streaming and communications over the Internet and wireless networks, scalable media representation, wireless and mobile systems, content-based image and video analysis, multimedia search, P2P networking and streaming, digital right management, web-based media technologies and systems; led the groups to contribute over a dozen key technologies to Microsoft products ranging from image and video codecs to content analysis technologies for multimedia search, and six technologies to MPEG standards; proposed the new Media 2.0 concepts for web media; initiated the eHealth project; started mobile intent mining project at MSRA.
- 1996/09 – 1999/05: Member of Technical Staff, Sarnoff Corporation, Princeton, USA
Performed research and development on JPEG2000, MPEG-4, MPEG-2, DVB, HDTV, and AC3 algorithms and systems; designed MPEG-4, MPEG-2, and HDTV encoder/decoder software and ASIC chips; designed video post-processing algorithms and software; contributed the SA-DWT technology to MPEG-4 standards; invented memory-efficient algorithms for HDTV decoder; invented low-cost AC-3/MPEG audio decoder; invented scalable shape coding algorithms for still texture coding adopted in MPEG-4; designed the transport parser for a single chip DVB decoder; designed programmable transport test vector generator software for both ATSC and DVB system.
- 1996/06 – 1996/08: Summer Intern, Vector Vision, Inc., Bethlehem, PA, USA
Investigated and implemented MPEG-4/H.263 codecs; invented, designed and implemented real time video encoder/decoder for Windows using proprietary vector signal processing algorithms.
- 1993/09 – 1996/10: Research Assistant, EECS Department, Lehigh University, Bethlehem, PA, USA
Conducted research and development in the areas of: vector wavelet tools and algorithms for MPEG-4 standard, video and image compression – algorithms and implementation, MPEG-1/MPEG-2/JPEG/H.263 software implementation and simulation, low bit rate VQ performance analysis, optimal signal processing for vector quantization, signal processing for arbitrary shaped image region, shape adaptive wavelet transforms, VLSI signal processing, multimedia software development; invented optimal vector transform for image and video coding; invented shape-adaptive wavelet transform scheme that was later adopted in MPEG-4; developed video Hotspot technology that was used in a multimedia education software package; directed students and developed the first generation Web-based cross-platform video-on-demand experimental system over internet; developed novel mouse-based graffiti-like user interface for video control.
- 1994/05 – 1994/08: Summer Intern, Interval Research Corporation, Palo Alto, CA, USA
Investigated new image and video compression schemes using wavelet transform and vector quantization, real-time MPEG-1/MPEG-2 codecs; developed hierarchically predictive motion estimation algorithm; participated research on future computer technologies.
- 1993/01 – 1993/08: Research Assistant, Center for Wireless Information Network Studies (CWINS), Worcester Polytechnic Institute, Worcester, MA, USA
Performed research in areas of radio propagation characteristics of indoor and outdoor wireless communications, advanced digital communication systems, wireless communication networking; parallel and distributed scientific computing, designed and implemented indoor wireless channel simulation software using distributed computing techniques.
- 1991/07 – 1992/07: Assistant Professor, Department of Electronic Engineering
University of Science and Technology of China, Hefei, China
Proposed, directed and conducted research and development in the areas of personal communication system using CDMA, low-SNR communication signals detection and recognition, robustness of synchronization loop in spread spectrum communication, fast acquisition of spread spectrum signals.
- 1987/08 – 1991/07: Research Assistant, Information Communications and Coding Laboratory (ICCL), University of Science and Technology of China, Hefei, China
Performed research in areas of error correction coding, spread spectrum systems performance analysis; invented several families of secure pseudo-random codes with optimal performance for CDMA systems; developed high speed spread spectrum code generator; designed and implemented communication system simulation software; designed schemes for anti-copy/anti-reverse-engineering software based on the physical characteristics of the software media and successfully implemented them in one of earlier software products.