BEN LEONG

Associate Professor
School of Computing

National University of Singapore

15 Computing Drive, COM2 Building, #03-20, S(117418)

Tel: (+65) 6516 4240 Fax: (+65) 6779 4580

Email: benleong at comp.nus.edu.sg

• Umair Z. Ahmed, Shubham Sahai, Ben Leong and Amey Karkare. “Feasibility Study of Augmenting Teaching Assistants with AI for CS1 Programming Feedback”. Technical Symposium on Computer Science Education (SIGCSE TS 2025). Pittsburgh, USA. Feb 2025. To appear. 

• Ayush Mishra, Lakshay Rastogi, Raj Joshi, and Ben Leong. "Keeping an Eye on Congestion Control in the Wild with Nebby". Proceedings of ACM Special Interest Group on Data Communication (SIGCOMM 2024). Sydney, Australia. Aug 2024. (Acceptance Rate: 62/366, 16.9%)   Slides

• Shubham Sahai, Umair Ahmed and Ben Leong. "Improving the Coverage of GPT for Automated Feedback on High School Programming Assignments". Proceedings of the NeurIPS'23 Workshop on Generative AI for Education (GAIED). New Orleans, USA. Dec 2023.  Slides Poster

• Ayush Mishra, and Ben Leong. "Containing the Cambrian Explosion in QUIC Congestion Control". Proceedings of the 2023 Internet Measurement Conference (IMC '23). Oct 2023. (Acceptance Rate: 52/201, 25.9%) Slides

• Raj Joshi, Cha Hwan Song, Xin Zhe Khooi, Nishant Budhdev, Ayush Mishra, Mun Choon Chan and Ben Leong. "Masking Corruption Packet Losses in Datacenter Networks with Link-local Retransmission". Proceedings of ACM Special Interest Group on Data Communication (SIGCOMM 2023). New York City, USA. Sep 2023. (Acceptance Rate: 73/323, 22.6%) Slides

• Ayush Mishra, Wee Han Tiu, and Ben Leong. "Are we heading towards a BBR-dominant Internet?" Proceedings of the 2022 Internet Measurement Conference (IMC '22). Oct 2022. (Acceptance Rate: 56/212, 26.4%) Slides

• Ayush Mishra, Sherman Lim, and Ben Leong. "Understanding Speciation in QUIC Congestion Control" Proceedings of the 2022 Internet Measurement Conference (IMC '22). Oct 2022. (Acceptance Rate: 56/212, 26.4%) Slides

• Raj Joshi, Qi Guo, Nishant Budhdev, Ayush Mishra, Mun Choon Chan, and Ben Leong . "LinkGuardian: Mitigating the impact of packet corruption loss with link-local retransmission". Proceedings of the Asia-Pacific Workshop on Networking (APNet). June 2022. Slides

• Ayush Mishra, Jingzhi Zhang, Melodies Sim, Sean Ng, Raj Joshi,and Ben Leong. "Conjecture: Existence of Nash Equilibria in Modern Internet Congestion Control". Proceedings of the Asia-Pacific Workshop on Networking (APNet). June 2021. Slides

• Ayush Mishra, Xiangpeng Sun, Atishya Jain, Sameer Pande, Raj Joshi, and Ben Leong. "The Great Internet TCP Congestion Control Census". Proceedings of the ACM on Measurement and Analysis of Computing Systems (SIGMETRICS 2019). Volume 3. Issue 3. December 2019.  (Acceptance Rate: 17/72, 24%) Slides

• Yang Hu, Umair Z. Ahmed, Sergey Mechtaev, Ben Leong, and Abhik Roychoudhury. "Re-factoring based Program Repair applied to Programming Assignments". Proceedings of the 34th IEEE/ACM International Conference on Automated Software Engineering (ASE 2019). San Diego, USA. November 2019. (Acceptance Rate: 93/445, 21%)

• Ting Qu, Raj Joshi, Mun Choon Chan, Ben Leong, Deke Guo and Zhong Liu, "SQR: In-network Packet Loss Recovery from Link Failures for Highly Reliable Datacenter Networks".  Proceedings of the 27th IEEE International Conference on Network Protocols (ICNP 2019). Chicago, Illinois, USA. October 2019. (Acceptance Rate: 41/212, 19%)  Slides Awarded Best Paper.

• Shuaizhao Jin, Xiangyun Meng, Daniel Lin-Kit Wong, Zixiao Wang, Ben Leong, Yabo Dong and Dongming Lu, "Improving Neighbor Discovery by Operating at the Quantum Scale".  Proceedings of the 15th IEEE International Conference on Mobile Ad hoc and Sensor Systems (IEEE MASS 2018), Chengdu, China. October 2018. Slides

• Raj Joshi, Ting Qu, Mun Choon Chan, Ben Leong and Boon Thau Loo, "BurstRadar: Practical Real-time Microburst Monitoring for Datacenter Networks". Proceedings of the 9th ACM Asia-Pacific Workshop on Systems (APSys 2018). Jeju Island, South Korea. August 2018.  (Acceptance Rate: 18/50, 36%)  Slides

• Wai Kay Leong, Zixiao Wang, and Ben Leong, "TCP Congestion Control Beyond Bandwidth-Delay Product for Mobile Cellular Networks". Proceedings of the 13th International Conference on emerging Networking EXperiments and Technologies (CoNEXT 2017),  Seoul, South Korea. December 2017. (Acceptance Rate: 40/222, 18.0%) Slides

• Xiangyun Meng, Wei Wang, and Ben Leong, "SkyStitch: a Cooperative Multi-UAV-based Realtime Video Surveillance System with Stitching". Proceedings of the ACM Multimedia Conference 2015 (ACMMM 2015), Brisbane, Australia. October 2015.  (Acceptance Rate: 52/252, 20.6%) Slides TODAY article

• Shuaizhao Jin, Zixiao Wang, Wai Kay Leong, Ben Leong, Yabo Dong, and Dongming Lu, "Improving Neighbor Discovery with Slot Index Synchronization". Proceedings of the 12th IEEE International Conference on Mobile Ad hoc and Sensor Systems (IEEE MASS 2015), Dallas, USA. October 2015. Slides

• Cristina Carbunaru, Yong Meng Teo, Ben Leong and Tracey Ho. "Modeling Flash Crowd Performance in Peer-to-peer File Distribution". IEEE Transactions on Parallel and Distributed Systems. Volume 25, Issue 10, pp 2617-2626, October 2014.

• Wei Wang, Wai Kay Leong, and Ben Leong, "Potential Pitfalls of the Message in Message Mechanism in Modern 802.11 Networks". Proceedings of the 9th ACM International Workshop on Wireless Network Testbeds, Experimental Evaluation & Characterization (WiNTECH 2014), Maui, Hawaii. September 2014. Slides

• Wei Wang, Qiang Wang, Wai Kay Leong, Ben Leong, and Yi Li, "Uncovering a Hidden Wireless Menace: Interference from 802.11x MAC Acknowledgment Frames". Proceedings of the 11th Annual IEEE Communications Society Conference on Sensor, Mesh and Ad Hoc Communications and Networks (SECON 2014), Singapore. June 2014. (Acceptance Rate: 68/235, 28.9%) Slides

• Wei Wang, Ben Leong, and Wei Tsang Ooi. "Mitigating Unfairness due to Physical Layer Capture in Practical 802.11 Mesh Networks". IEEE Transactions on Mobile Computing. Volume 14, Issue 1, pp 99-112, April 2014.

• Yin Xu, Zixiao Wang, Wai Kay Leong, and Ben Leong. "An End-to-End Measurement Study of Modern Cellular Data Networks". Proceedings of the 15th Passive and Active Measurement Conference (PAM 2014). Los Angeles, USA. March 2014. (Acceptance Rate: 24/76, 31.5%) Slides

• Wai Kay Leong, Aditya Kulkarni, Yin Xu and Ben Leong. "Unveiling the Hidden Dangers of Public IP Addresses in 4G/LTE Cellular Data Networks". Proceedings of the 15th International Workshop on Mobile Computing Systems and Applications (HotMobile 2014). Santa Barbara, USA. February 2014. (Acceptance Rate: 22/72, 30.5%) Slides

• Wai Kay Leong, Yin Xu, Ben Leong and Zixiao Wang. "Mitigating Egregious ACK Delays in Cellular Data Networks by Eliminating TCP ACK Clocking". Proceedings of the 21st IEEE International Conference on Network Protocols (ICNP 2013). Göttingen, Germany. October 2013. (Acceptance Rate: 46/251, 18%) Slides

• Yin Xu, Ben Leong, Daryl Seah and Ali Razeen. "mPath: High-Bandwidth Data Transfers with Massively-Multipath Source Routing". IEEE Transactions on Parallel and Distributed Systems, Volume 24, Issue 10, pp 2046-2059, October 2013.

• Wei Wang, Raj Joshi, Aditya Kulkarni, Wai Kay Leong and Ben Leong. "Feasibility Study of Mobile Phone WiFi Detection in Aerial Search and Rescue Operations". Proceedings of the 4th ACM Asia-Pacific Workshop on Systems (APSys 2013). Singapore. July 2013.  (Acceptance Rate: 20/73, 27%) Slides

• Guoqing Yu, Wei Wang, James Yong, Ben Leong, and Wei Tsang Ooi. "Adaptive Antenna Adjustment for 3D Urban Wireless Mesh Networks". Proceedings of the IEEE International Conference on Sensing, Communication and Networking (SECON 2013). New Orleans, Louisiana. June 2013. (Acceptance Rate: 51/171, 30%) Slides

• Manjunath Doddavenkatappa, Mun Choon Chan, and Ben Leong. "Splash: Fast Data Dissemination with Constructive Interference in Wireless Sensor Networks". Proceedings of the 10th USENIX Symposium on Networked Systems Design and Implementation (NSDI 2013). Lombard, Illinois. April 2013. (Acceptance Rate: 38/171, 22%)

• Yin Xu, Wai Kay Leong, Ben Leong and Ali Razeen. "Dynamic Regulation of Mobile 3G/HSPA Uplink Buffer with Receiver-Side Flow Control". Proceedings of the 20th IEEE International Conference on Network Protocols (ICNP 2012). Austin, Texas. October 2012. (Acceptance Rate: 30/131, 23%) Slides

• Manjunath Doddavenkatappa, Mun Choon Chan, and Ben Leong. "Improving Link Quality by Exploiting Channel Diversity in Wireless Sensor Networks". Proceedings of 32nd IEEE Real-Time Systems Symposium (RTSS 2011). Vienna, Austria. November 2011. (Acceptance Rate: 21%)

• Cristina Carbunaru, Yong Meng Teo, and Ben Leong. "A Performance Study of Peer-assisted File Distribution with Heterogeneous Swarms". Proceedings of the 36th IEEE Conference on Local Computer Networks (LCN 2011). Bonn, Germany. October 2011. (Acceptance Rate: 53/181, 29%)

• Jiangwei Zhou, Yu Chen, Ben Leong, and Pratibha Sundar Sundaramoorthy. "Practical 3D Geographic Routing for Wireless Sensor Networks". Proceedings of the 8th ACM Conference on Embedded Networked Sensor Systems (SenSys 2010). Zurich, Switzerland. November 2010. (Acceptance Rate: 25/145, 17%) Slides

• Jiangwei Zhou, Yu Chen, Ben Leong, and Boqin Feng. "Practical Virtual Coordinates for Large Wireless Sensor Networks". Proceedings of the 18th IEEE International Conference on Network Protocols (ICNP 2010). Kyoto, Japan. October 2010. (Acceptance Rate: 31/170, 18%) Slides

• Ben Leong, Wang Youming, Su Wen, Cristina Carbunaru, Teo Yong Meng, Christopher Chang and Tracey Ho. "Improving Peer-to-Peer File Distribution: Winner Doesn’t Have to Take All". Proceedings of the 1st ACM Asia-Pacific Workshop on Systems (APSys 2010). New Delhi, August 2010.  (Acceptance Rate: 10/23, 43%) Slides

• Christopher S. Chang, Tracey Ho, Michelle Effros, Muriel Medard, and Ben Leong. "Issues in Peer-to-Peer Networking: a Coding Optimization Approach". Proceedings of the IEEE International Symposium on Network Coding (NetCod 2010). Toronto, Canada, June 2010.

• Daryl Seah, Wai Kay Leong, Qingwei Yang, Ben Leong, and Ali Razeen. "Peer NAT Proxies for Peer-to-Peer Games". Proceedings of the 8th Annual Workshop on Network and Systems Support for Games (NetGames 2009). Paris, France. November 2009. (Acceptance Rate: 10/37, 27%)

• Jiaqiang Bai, Daryl Seah, James Yong, and Ben Leong. "Offloading AI for Peer-to-Peer Games with Dead Reckoning". Proceedings of the 8th International Workshop on Peer-to-Peer Systems (IPTPS '09), Boston, MA, April 2009. (Acceptance Rate: 12/56, 20%)

• Tracey Ho, Ben Leong, Ralf Koetter, Muriel Medard, Michelle Effros and David Karger. "Byzantine Modification Detection in Multicast Networks with Randomized Network Coding," IEEE Transactions on Information Theory, 54 (6). pp. 2798-2803. 2008.

• Ben Leong, Barbara Liskov, and Robert Morris, "Greedy Virtual Coordinates for Geographic Routing". Proceedings of the 15th IEEE International Conference on Network Protocols (ICNP 2007), Beijing, China, October 2007. (Acceptance Rate: 32/220, 15%) Slides

• Luther Chan, James Yong, Jiaqiang Bai, Ben Leong, Raymond Tan. "Hydra - A Massively-Multiplayer Peer-to-Peer Architecture for the Game Developer", Proceedings of the 6th Annual Workshop on Network and Systems Support for Games (Netgames 2007), Melbourne, Australia, September 2007.

• Tracey Ho, Muriel Médard, Ralf Koetter,  David R. Karger, Michelle Effros, Jun Shi, and Ben Leong, "A Random Linear Network Coding Approach to Multicast," IEEE Transactions on Information Theory, Vol. 52, No. 10, pp. 4413-4430, October 2006. Awarded 2009 ComSoc & Information Theory Society Joint Paper Award.

• Ben Leong, "New Techniques for Geographic Routing". PhD Thesis, MIT. May 2006.

• Ben Leong, Barbara Liskov, and Robert Morris, "Geographic Routing without Planarization". Proceedings of the 3rd Symposium on Network Systems Design and Implementation (NSDI 2006). San Jose, CA, May 2006. (Acceptance Rate: 28/110, 25%) Slides

• Ben Leong, Barbara Liskov, and Erik D. Demaine, "EpiChord: Parallelizing the Chord Lookup Algorithm with Reactive Routing State Management", Computer Communications. Vol. 29, Issue. 9, pp. 1243-1259, May 2006.  Tech Report

• Ben Leong, Sayan Mitra, and Barbara Liskov, "Path Vector Face Routing: Geographic Routing with Local Face Information". Proceedings of the 13th IEEE International Conference on Network Protocols (ICNP 2005). Boston, MA, November 2005. (Acceptance Rate: 36/212, 17%) Slides

• Tracey Ho, Ben Leong, Yu-Han Chang, Yonggang Wen and Ralf Koetter. "Network monitoring in multicast networks using network coding", Proceedings of the 2005 IEEE International Symposium on Information Theory (ISIT), Adelaide, Australia. September 2005.

• Tracey Ho, Ben Leong, Ralf Koetter and Muriel Medard, "Distributed Asynchronous Algorithms for Multicast Network Coding", Proceedings of the 1st Workshop on Network Coding (NetCod 2005). Riva del Garda, Italy, April 2005.

• Ben Leong and Ji Li "Achieving One-Hop DHT Lookup and Strong Stabilization by Passing Tokens", Proceedings of the 12th International Conference on Networks 2004 (ICON 2004), Singapore, November 2004. Slides

• Ben Leong, Barbara Liskov, and Erik D. Demaine, "EpiChord: Parallelizing the Chord Lookup Algorithm with Reactive Routing State Management", Proceedings of the 12th International Conference on Networks 2004 (ICON 2004), Singapore, November 2004. Awarded Best Paper. Slides

• Tracey Ho, Ben Leong, Muriel Medard, Ralf Koetter, Yu-Han Chang, and Michelle Effros, "On the Utility of Network Coding in Dynamic Environments", Proceedings of the International Workshop on Wireless Ad-hoc Networks (IWWAN) 2004, Finland, June 2004. Awarded Best Student Paper.

• Tracey Ho, Ben Leong, Ralf Koetter, Muriel Médard, Michelle Effros, and David Karger, "Byzantine Modification Detection in Multicast Networks using Randomized Network Coding", Proceedings of the 2004 IEEE International Symposium on Information Theory (ISIT), Chicago, IL. June 2004. Extended Version

•  Link to DBLP entry.

PhD Theses Supervised:

• Ayush Mishra, "Understanding the Modern Internet’s Heterogeneous Congestion Control Landscape". PhD Thesis, NUS. Sep 2024.  ACM SIGMETRICS Doctoral Dissertation Award 2024, Honourable Mention  

• Raj Joshi, "In-Network Techniques for Highly Reliable Datacenter Networks". PhD Thesis, NUS. Mar 2023.

• Zixiao Wang, "Towards A Low-Latency Future Internet". PhD Thesis, NUS. Jul 2019.

• Wei Kay Leong, "A Rate-based TCP Congestion Control Framework for Cellular Data Networks". PhD Thesis, NUS. Dec 2014.

• Yin Xu, "Understanding and Mitigating Congestion in Modern Networks". PhD Thesis, NUS. Jul 2014.

• Wei Wang, "Mitigating the Impact of Physical Layer Capture and ACK Interference in Wireless 802.11 Networks". PhD Thesis, NUS. Jul 2014.