My homepage has been moved to  ! :-)
李振华  Dr. Zhenhua Li
Researcher, GreenOrbs - Cloud Group, TNLIST, Beijing & Wuxi, China
PostDoc, School of Software, Tsinghua University, Beijing, China
Ph.D., Peking University, Beijing, China
Address: East Main Building - Area 11 (School of Software), Room 212, Tsinghua University, Beijing, China
Email: (primary)

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QQ: 69900639

My best while conceptually simplest research work till now has been accepted by Middleware'13 --- Efficient Batched Synchronization in Dropbox-like Cloud Storage Services!  Luckily, this is the first time that Middleware comes to China.
I've started my new job at Tsinghua University in July, 2013 !
My first baby came to the world on June 26, 2013 !   God bless him !
I've passed the Ph.D. thesis defense on June 8, 2013 ! :)

Brief CV:
2013.7 - now       Researcher @ GreenOrbs - Cloud Group, TNLIST, Tsinghua University, Beijing & Wuxi, China
2013.7 - now       PostDoc @ School of Software, Tsinghua University, Beijing, China,   Mentor: Changjiang Prof. Yunhao Liu
2009.6 - 2013.6   Ph.D. @ School of EECS, Peking University, Beijing, China,   Supervisor: Prof. Yafei Dai
2011.9 - 2012.9   Joint-Ph.D. @ University of Minnesota, Twin Cities,   Mentor: Qwest Chair Prof. Zhi-Li Zhang (IEEE Fellow)
2011.9 - 2012.9   Christianity study @ Connexions, Stadium Village Church, Minneapolis,   Tutor: Robert & Joanne Kraftson
2010.6 - 2010.8   Research Intern @ Tencent Research (Shanghai),   Coordinator: Yan Huang, Gang Liu, Fuchen Wang.
2008.6 - 2009.4   Software Engineer @ Marvell Technologies (Shanghai) Co. Ltd
2007.5 - 2007.10 Research Assistant @ Hong Kong Polytechnic University,   Mentor: Chair Prof. Jiannong Cao
2001.9 - 2008.6   Bachelor & Master @ Dept. of Computer Sci & Tech, Nanjing University,   Supervisor: Prof. Guihai Chen

Research Summary:
My research areas mainly include Cloud Storage (like Dropbox, Google Drive and 360 CloudDisk), Cloud Download (like QQXuanfeng and Xunlei), Internet of Things (including WSN, RFID, etc.), and P2P (like AmazingStore and CoolFish). The Google Scholar Citations of my publications have reached: 162.

Published 28 papers on Recognized conferences/workshops (Middleware, ACM-MM, NOSSDAV, IWQoS, IPDPS, ICPP*2, ICCCN, etc.) and SCI journals (TPDS*2, TOMCCAP, JPDC, etc.); besides, publised one book named Peer-to-Peer Network: Structure, Application and Design (《对等网络:结构、应用与设计》)清华大学出版社,中国大学出版社图书奖首届优秀学术著作一等奖 !(Google Scholar Citations: 86, Sampling chapters only for academic/educational use: [Preface][Ch1][Ch2][Ch5][Ch9][References])

Served as Web and Publicity Chair of HotPOST'11, and PC Member of conferences/workshops including ICNP'13 PhD Forum, ICPP'12, ICCCN'11, HotPOST'11, etc.

Efficient Batched Synchronization

Acting as a middleware between the user's file storage system and a cloud storage application (e.g. Dropbox), our proposed UDS (i.e. update-batched delayed sync) mechanism properly batches updates from clients to minimize the "traffic overuse problem", while preserving the rapid file synchronization that users expect from cloud storage services.

Paper was published in ACM/IFIP/USENIX Middleware'13.

Cloud Bandwidth Scheduler


efficiently schedules cloud bandwidth into end host peers to maximize the bandwidth multiplier effect with a fine-grained model and fast-convergent iterative algorithm ("FIFA"). This work is simulated on the QQXuanfeng system trace and is implemented on the CoolFish VoD streaming prototype.

Paper was published in IEEE/ACM IWQoS'12.

Cloud Transcoder

bridges the format and resolution gap between Internet videos and mobile devices by utilizing an intermediate cloud platform. The user only sends his video request to Cloud Transcoder which does everything else: download, transcode, cache, transfer back, and so forth.

Paper was published in SIGMM NOSSDAV'12.

 ★ Cloud Download  (or says Offline Download)

achieves high-quality content distribution (especially for unpopular videos) by using cloud utilities to guarantee the data health and enhance the data transfer rate. Please try the large-scale  QQXuanfeng Cloud Download system!

Paper was published in ACM-MM'11 as a Long Paper.

Cloud Tracker  (or says Open-P2SP content distribution)


dynamically tracks and integrates various third-party servers, contents and data transfer protocols all over the Internet into a large, open and federated P2SP (peer-to-server/peer) platform, so as to accelerate the content distribution from servers to clients and among peer swarms. It also facilitates load-balancing among the involved servers. Please try the large-scale  QQXuanfeng system!

Papers were published in ACM-MM'11 Doctoral Symposium and TPDS.

P2P Media Streaming Optimization


optimizes several critical performance metrics (i.e., playback continuity, startup latency, media source switching time, overlay resilience, etc.) of P2P video streaming.

Papers were published in IPDPS'08, ICPP'08, 《软件学报》'08, ICPP'09, JPDC'10, ICPADS'10, ICCCN'11, TPDS'11TOMCCAP'12, etc.


Awards: (I strongly believe that money is important for scholars, though it may be not essential.)
2009, 2010, 2011, 2012 1st, 2nd, 3rd & 4th President's PhD Scholarships of Peking University(北京大学第1/2/3/4届博士生校长奖学金¥36000*3.5
2011-2012 Scholarship for Studying Overseas from China Scholarship Council(国家公派留学奖学金$1600*12
2012 Academic Innovation Award of Peking University(北京大学“学术创新奖”)
2012 Ten Academic Elites of EECS, Peking University(北京大学信息学院“学术十杰”)
2008, 2010 Tung OOCL Scholarship(董氏东方奖学金 )¥5000*2
2008 HP Excellent Student Scholarship(惠普奖学金)¥5000
2007 Nanrui Company Scholarship(南瑞继保奖学金 )¥4000
2003, 2004 National Scholarship for Chinese Undergraduates(本科生国家奖学金 )¥8600 + 10600
2002, 2004 People's Scholarship of Nanjing University(南京大学人民奖学金 )¥1500 + 2500
2009 Outstanding Master's Degree Thesis of Jiangsu Province, 2009(江苏省2009年度优秀硕士学位论文
2008 Excellent Graduate Student Prize of Nanjing University(南京大学优秀研究生)
2006 Excellent Member of the Graduates' Union, Nanjing University(南京大学研究生会优秀干事)
2003, 2004 Excellent Undergraduate Student Prize of Nanjing University(南京大学优秀本科生)
2004 National BBS Programming Contest of College Students (the champion of Application Software Match)
2003 National English Contest of College Students, the second prize(全国大学生英语竞赛二等奖)

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