Contact Info

Name: Jinkyu Koo (구진규 in Korean; 具珍奎 in Hanja)
Address: 2788 San Tomas Expy, Santa Clara, CA 95051
Email: jinkyuk (at) nvidia (dot) com

I am now a senior deep learning software engineer at NVIDIA. I got my Ph.D. from Purdue University, studying issues on embedded systems, network security, and smart grid privacy, and have worked in industry as a software engineer on Linux systems, the physical layer of wireless communication systems, and machine learning accelerators. My current interest is accelerating deep learning applications using GPUs, covering TensorRT and CUDA issues.

I am a dad of two boys. As many would agree, parenting two boys is tough both mentally and physically. Every day, my wife and I are struggling to manage the right balance between work and parenting. However, I can say that the time spent with my kids is my best time of a day.

Throughout my childhood, I had learned that I am terrible at all kinds of sports that human beings created. However, in my mid-20s, I found out that there is an exception, which is an ice hockey. The ice hockey is the first sport that I felt I may be as good as others. I had played it for several years, sometimes seriously. Since my second son was born, I have stopped the ice hockey, but I always dream of resuming to play it in a near future.

Recently, I got a new hobby, which is tennis. I play tennis almost everyday. However, due to schedule conflicts, I do it mostly alone against a wall. I have played tennis with a human only a few times, so I do not really know if I am good or bad at it.

Since the shelter-in-place due to COVID19 began, I am also into backyard farming. I grow multiple kinds of vegetables, and I am developing my specialty as germinating mango seeds. I am researching the most effective way to grow mango from seeds in California’s climate.

1. J. Koo, C. Saumya, M. Kulkarni, and S. Bagchi, “PySE: Automatic Worst-Case Test Generation by Reinforcement Learning,”
   At the 12th IEEE International Conference on Software Testing, Verification, and Validation (ICST), Apr. 2019. (Acceptance rate = 28.1%)

2. C. Saumya, J. Koo, M. Kulkarni, and S. Bagchi, “XSTRESSOR: Automatic Generation of Large-Scale Worst-Case Test Inputs by Inferring Path Conditions,” At the 12th IEEE International Conference on Software Testing, Verification, and Validation (ICST), Apr. 2019. (Acceptance rate = 28.1%) (IEEE TCSE distinguished paper award)

3. R. Xu, J. Koo, R. Kumar, P. Bai, S. Mitra, S. Misailovic, and S. Bagchi, “VideoChef: Efficient Approximation for Streaming Video Processing Pipelines,” At the 2018 USENIX Annual Technical Conference (USENIX ATC), July 2018. (Acceptance rate = 20.1%)

4. S. Sen, J. Koo, and S. Bagchi, “TRIFECTA: Security, Energy-Efficiency, and Communication Capacity Comparison for Wireless IoT Devices,” IEEE Internet Computing, 22(1):74-81, Jan./Feb. 2018.

5. J. Koo, J. Zhang, and S. Chaterji, “Tiresias: Context-sensitive Approach to Decipher the Presence and Strength of MicroRNA Regulatory Interactions,” Theranostics, 8(1):277-291, Jan. 2018. (Impact factor = 8.712)

6. T. E. Thomas, J. Koo, S. Chaterji, and S. Bagchi, “Minerva: A Reinforcement Learning-based Technique for Optimal Scheduling and Bottleneck Detection in Distributed Factory Operations,” At the 10th IEEE Conference on Communication Systems and Networks (COMSNETS), Jan. 2018. (Acceptance rate = 30.4%)

7. S. Chaterji, J. Koo, N. Li, F. Meyer, A. Grama, and S. Bagchi, “Federation in Genomics Pipelines: Techniques and Challenges,” Briefings in Bioinformatics, bbx102, Aug. 2017. (Impact factor = 5.134)

8. J. Koo, X. Lin, and S. Bagchi, “RL-BLH: Learning-Based Battery Control for Cost Savings and Privacy Preservation for Smart Meters,” At the 47th Annual IEEE/IFIP International Symposium on Dependable Systems and Networks (DSN), June 2017. (Acceptance rate = 22.2%) (slides)(codes)

9. A. A. Clements, N. S. Almakhdub, K. Saab, P. Srivastava, J. Koo, S. Bagchi, and M. Payer, “Protecting Bare-metal Embedded Systems with Privilege Overlays,” At the 38th IEEE Symposium on Security and Privacy (Oakland/SP), May 2017. (Acceptance rate = 13.3%)

10. M. Kim, J. Koo, H. Lee, and J. R. Geraci, “Memory Management Scheme to Improve Utilization Efficiency and Provide Fast Contiguous Allocation without a Statically Reserved Area,” ACM Transactions on Design Automation of Electronic Systems (TODAES), 21(1), Nov. 2015.

11. D.-H. Shin, J. Koo, L. Yang, X. Lin, S. Bagchi, and J. Zhang, “Low-Complexity Secure Protocols to Defend Cyber-Physical Systems Against Network Isolation Attacks,” At the 1st IEEE Conference on Communications and Network Security (CNS), Oct. 2013. (Acceptance rate = 28.4%)

12. J. Koo, D.-H. Shin, X. Lin, and S. Bagchi, “A Delay-Bounded Event-Monitoring and Adversary-Identification Protocol in Resource-Constraint Sensor Networks,” Elsevier Ad Hoc Networks, 11(6):1820-1835, Aug. 2013. (Impact factor = 3.178)

13. J. Koo, X. Lin, and S. Bagchi, “PRIVATUS: Wallet-Friendly Privacy Protection for Smart Meters,” At the 17th European Symposium on Research in Computer Security (ESORICS), Sep. 2012. (Acceptance rate = 20.2%)

14. J. Koo, M. Lee, and S. Bagchi, “Fault tolerant and energy-efficient real-time scheduling of packet transmission for wireless network interface cards,” At the 39th Annual IEEE/IFIP International Symposium on Dependable Systems and Networks (DSN), June 2009, Fast Abstract.

15. J. Koo, R.K. Panta, S. Bagchi, and L. Montestruque, “A tale of two synchronizing clocks,” At the 7th ACM Conference on Embedded Networked Sensor Systems (SenSys), Nov. 2009. (Acceptance rate = 17.6%)

16. I. Song, J. Koo, H. Kwon, S.R. Park, S.R. Lee, and B.-H. Chung, “A novel detection criterion for weak M-ary signals and its application to ultra wideband multiple access systems,” IEEE Transactions on Vehicular Technology, 54(6):2024-2036, Nov. 2005.

17. J. Koo, S. Yoon, J. Bae, S.Y. Kim, and I. Song, “Detection of M-ary signals for ultra wideband multiple access systems,” Communication Systems and Applications (CSA), July 2004.

1. J. Koo, Y.K. Cho, C.Y. Oh, S.R. Jeong, T.Y. Kim, D.S. Park, J.Y. Jung, J.Y. Choi, E.T. Lim, C.H. Suh, J.H. Jang, “Apparatus and method for performing ranging in a communication system,” Patent number: US8059525, Issue date: Nov 15, 2011

2. C.H. Suh, J. Koo, D.S. Park, Y.K. Cho, E.T. Lim, J.S. Woo, “System and method for acquiring cell in a frequency overlay communication system,” Patent number: US7852813, Issue date: Dec 14, 2010

3. C.H. Suh, D.S. Park, Y.K. Cho, E.T. Lim, J. Koo, J.S. Woo, “System and method for transmitting/receiving signal in a frequency overlay communication system,” Patent number: US7801532, Issue date: Sep 21, 2010

4. H.C. Nguyen, E.D. Carvalho, J. Koo, S.R. Jeong, Y.K. Cho, J.W. Cho, D.S. Park, H.K. Choi, “Apparatus and method for estimating uplink frequency offset in wireless communication system,” Patent number: US7949034, Issue date: May 24, 2011

5. J.H. Cho, J.H. Park, K.H. Roh, T.Y. Kim, J. Koo, “Control system and method in a communication system,” Patent number: US8023897, Issue date: Sep 20, 2011

6. J.H. Cho, J. Koo, J.H. Park, K.H. Roh, T.Y. Kim, S.Y. Yoon, “Apparatus and method for transmitting/receiving a signal in a communication system,” Patent number: US8045596, Issue date: Oct 25, 2011

7. M.I. Rahman, R.V. Reynisson, F.H.P. Fitzek, R. Prasad, J. Koo, D.S. Park, Y.K. Cho, Y.K. Kim, E.T Lim, J.Y. Jung, “Apparatus and method for operating frequency resources in a mobile communication system,” Patent number: US7768987, Issue date: Aug 3, 2010

8. C.H. Suh, D.S. Park, S.K. Hong, Y.K. Cho, J. Koo, J.S. Woo, “Frequency overlay communication system and transmission/reception method thereof,” Patent number: US7801226, Issue date: Sep 21, 2010

9. T.Y. Kim, J.H. Cho, J.W. Cho, J.H. Park, K.H. Roh, J. Koo, “Apparatus and method for transmitting and receiving map information in a communication system,” Patent number: US7839761, Issue date: Nov 23, 2010

10. E.D. Carvalho, M.I. Rahman, D. Mazzarese, Y. Tang, J. Koo, “Apparatus and method for interference cancellation in multiple-antenna communication system,” Patent number: US8355474, Issue date: Jan. 15, 2013

11. K.H. Roh, J. Koo, J.H. Cho, J.H. Park, T.Y. Kim, S.Y. Yoon, H.K. Choi, “Apparatus and method for transmitting uplink feedback data in a broadband wireless mobile communication system,” Patent number: US8175045, Issue date: May 8, 2012

12. J.H. Park, K.H. Roh, J.H. Cho, T.Y. Kim, J. Koo, D.S. Park, H.K. Choi, “Method and system for configuring a frame in a communication system,” Patent number: US8644270, Issue date: Feb 4, 2014

13. T.Y. Kim, J.H. Cho, J.W. Cho, J.H. Park, K.H. Roh, J. Koo, “Apparatus and method for transmitting and receiving map information in a communication system,” Patent number: US7839761, Issue date: Nov. 23, 2010

14. K.H. Roh, J.H. Cho, J.H. Park, T.Y. Kim, J. Koo, “Method and system for controlling power in a communication system,” Patent number: US8300572, Issue date: Oct. 30, 2012

15. J.H. Cho, J. Koo, J.H. Park, K.H. Roh, T.Y. Kim, S.Y. Yoon, D.S. Park, “Apparatus and method for transmitting/receiving a signal in a communication system,” Patent number: US8045596, Issue date: Oct 25, 2011

16. J.H. Cho, J.H. Park, K.H. Roh, T.Y. Kim, J. Koo, “Control system and method in a communication system,” Patent number: US8023897, Issue date: Sep. 20, 2011

17. H.C. Nguyen, E.D. Carvalho, J. Koo, S.R. Jeong, Y.K. Cho, J.W. Cho, D.S. Park, H.K. Choi, “Apparatus and method for estimating uplink frequency offset in wireless communication system,” Patent number: US7949034, Issue date: May 24, 2011

18. M.I. Rahman, R.V. Reynisson, F.H. Paul Fitzek, R. Prasad, J. Koo, D.S. Park, Y.K. Cho, Y.K. Kim, E.T. Lim, J.Y. Jung, “Apparatus and method for operating frequency resources in a mobile communication system,” Patent number: US7768987, Issue date: Aug 3, 2010

19. J. Koo, Y.K. Cho, C.Y. Oh, S.R. Jeong, T.Y. Kim, D.S. Park, J.Y. Jung, J.Y. Choi, E.T. Lim, C.H. Suh, J.H. Jang, “Apparatus and method for performing ranging in a communication system,” Patent number: US8059525, Issue date: Nov. 15, 2011

20. C.H. Suh, J. Koo, D.S. Park, Y.K. Cho, E.T. Lim, J.S. Woo, “System and method for acquiring cell in a frequency overlay communication system,” Patent number: US7852813, Issue date: Dec. 14, 2010

21. C.H. Suh, D.S. Park, Y.K. Cho, E.T. Lim, J. Koo, J.S. Woo, “System and method for transmitting/receiving signal in a frequency overlay communication system,” Patent number: US7801532, Issue date: Sep. 21, 2010

22. C.H. Suh, D.S. Park, S.K. Hong, Y.K. Cho, J. Koo, J.S. Woo, “Frequency overlay communication system and transmission/reception method thereof,” Patent number: US7801226, Issue date: Sep. 21, 2010

23. S.K. Hong, J. Koo, D.S. Park, Y.K. Cho, “Apparatus and method for transmitting bit-interleaved coded modulation signals in an orthogonal frequency division multiplexing system,” US20060250944, Filing date: Apr 6, 2006

24. J. Koo, C.H. Suh, S.H. Park, Y.K. Kim, D.S. Park, J.M. Ro, S.K. Hong, Y.K. Cho, “Apparatus and method for signal transmission/reception according to pilot modulation in a multi-carrier communication system,” US20060109924, Filing date: Nov 21, 2005

25. J. Koo, S.H. Yoon, C.H. Suh, J.M. Ro, D.S. Park, Y.K. Cho, “Apparatus and method for estimating uplink frequency offset in an orthogonal frequency division multiplexing communication system,” US20060083160, Filing date: Oct, 14, 2005

26. S.K. Hong, J. Koo, D.S. Park, Y.K. Cho, “Mapping method for signal combining in a wireless communication system,” US20060120474, Filing date: Dec. 6, 2005

27. K.H. Roh, T.Y. Kim, J.H. Cho, J.H. Park, J. Koo, “Apparatus and method for increasing a service coverage of a broadcast channel in wireless communication system by using an HARQ scheme,” US20080137594, Filing date: Dec. 7, 2007

28. J.H. Park, T.Y. Kim, J.H. Cho, N.G. Kim, K.H. Roh, J. Koo, “Method and system for transmitting/receiving signal in a communication system,” US20080212531, Filing date: Mar. 3, 2008

29. J. Koo, S.H. Yoon, S.R. Jeong, D.S. Park, Y.K. Cho, S.K. Hong, “Apparatus and method for performance improvement of channel estimation in broadband wireless access communication system,” US20060251037, Filing date: Mar. 14, 2006

30. J. Koo, C.H. Suh, S.K. Hong, Y.K. Kim, D.S. Park, Y.K. Cho, “Apparatus and method for transmitting/receiving preamble signal in a wireless communication system,” US20060274843, Filing date: June 1, 2006

31. J.Y. Choi, Y.S. Park, J.Y. Jung, G.H. Lee, Y.H. Kim, J.G. Lee, D.S. Park, Y.K. Cho, J. Koo, “Electronic program guide apparatus and method in digital broadcasting system,” US20070055991, Filing date: Sep. 7, 2006

32. T.Y. Kim, J.H. Park, J.H. Cho, K.H. Roh, J.W. Cho, J. Koo, “Apparatus and method for generating subchannels in a communication system,” US20080187000, Filing date: Feb. 1, 2008

33. S.H. Yoon, J.M. Ro, J. Koo, S.R. Jeong, D.S. Park, Y.K. Cho, “Apparatus and method for transmitting/receiving uplink random access channel in mobile communication system,” US20050286409, Filing date: June 24, 2005

34. J. Koo, C.H. Suh, D.S. Park, Y.K. Cho, E.T. Lim, “Apparatus and method for reducing pilot overhead in a wireless communication system,” US20060291372, Filing date: June 26, 2006

35. J. Koo, S. Han, M. Kim, and I. Yeo “Memory management method and apparatus,” Patent number: US9405697, Filing date: Aug. 2, 2016

36. J. Park, J. Koo, S. Han, and M. Kim, “Apparatus and method for hardware-based task scheduling,” US20150301854, Filing date: Apr. 21, 2015

37. K. Kim, J. Koo, K. Kim, and H. Lee, “Method and apparatus for managing memory,” US20160357455, Filing date: June 3, 2016