Jaehyuk Choi

Associate Professor
Department of Software 
Gachon University
Seongnam, Korea

Office: Saerom Bldg 5-4 
e-mail: jchoi at gachon·ac·kr 

 Short Bio Sketch

  Jaehyuk Choi is currently an Associate Professor in the Department of Software at Gachon University, Seongnam, Korea. He received his Ph.D. degree in Electrical Engineering and Computer Science from Seoul National University in 2008. He was with the Real-Time Computing Laboratory (RTCL) at The University of Michigan, Ann Arbor, U.S.A. as a postdoctoral researcher from Dec. 2008 to Feb. 2011. His research interest includes wireless/mobile systems, Internet of Things (IoT) Connectivity and Sensing Systems, with emphasis on wireless LAN/PAN, mobile Wi-Fi, multipath TCP, network management, next-generation mobile networks, cognitive radios, data link layer protocols, and cross-layer approaches.

 Research Interests

· Wireless Networks and Mobile Computing 

· Internet-of-Things (IoT)  

· Computer Security: Network System Management/Secure Monitoring

· System Modeling, Performance Optimization, Implementation

I am looking for self-motivated (undergraduate/graduate) students to work on research projects in networking, mobile computing, and machine learning. Please feel free to contact me by e-mail (jchoi@gachon.ac.kr). 

학/석사연계, 석사, 또는 박사 과정 지원에 관심이 있는 학생은 연락 바랍니다.


· NRF Basic Science Research Program (연구책임자), 2017.6 - Present 
  -  A Study on Low-power Low-Delay Spectrum Sensing Technologies for Quality-of-Experience in Smart Devices
· 유선망 품질 지표 Simulator 2.0 개발 (연구책임자), SKT, 2016.8~2016.12 (완료)
· NRF Basic Science Research Program, 2014.9 - 2017.4 (완료)
  - 스마트 IoT 서비스를 위한 초정밀 측위 기술 개발 (연구책임자) 
· 유선망 품질 지표 Simulator 개발 (연구책임자), SKT, 2014.6~2014.11
· Multipath TCP, Network simulator, SKT, 2013, 2014. (완료)
  - WiFi AP에서 MPTCP 기반의 다중 인터페이스 동시 전송 기법 개발 .(참여), 2013.9~2013.12
· NRF Basic Science Research Program, Apr. 2012 - Apr. 2015. (완료)
-Wi-Fi를 통한 정보 침탈 행위 탐지를 위한 신뢰도 기반 사용자 협력적 탐지 기법 연구 (연구책임자)
· Future Internet, Apr. 2011 - Nov. 2011 (완료)
· GCU 교내연구과제, Apr. 2011 - Mar. 2012 (완료)
  -무선 이동기기에서의 에너지 효율적인 통신 알고리즘 개발 (연구책임자)


-Wireless Networking (F 2014, F 2015, F 2016, S 2017)
-Computer Networking (Fall 2011, F 2012, F 2013)
-Mobile Programming  (Android)  (Spring 2012, S 2013, S 2014, S 2015, S 2016)
-Object Oriented Programming (Spring 2014)
-Operating Systems  (Spring 2011, S 2012, S 2013)
-Probability and Statistics (Fall 2013, F 2014)
-Discrete Mathematics (S 2016, S 2017)
-Problem Solving / SW Programming Pattern (Fall 2011, F 2012, F 2015, F 2016, F 2017) 

  ◈ Research/Teaching Experience
· Visiting Scholar,  University of California San Diego (UCSD)     Feb.2018 – Present
· Associate Professor, Department of Software (소프트웨어학과),       Mar. 2011 – Present
  Gachon University, Seongnam, Korea

· Postdoctoral Researcher, Department of EECS,                                Dec. 2008 – Feb. 2011
  The University of Michigan, Ann Arbor, MI, U.S.A. (○ Advisor: Prof. Kang G. Shin) 

· Postdoctoral Researcher, Department of EECS,                              Sep. 2008 – Nov. 2008
  Seoul National University, Seoul, Korea (○ Advisor: Prof. Chong-kwon Kim) 

· Visiting Scholar, Department of Computer Science (CS),                 Jan. 2006 – Jul. 2006
  Purdue University, West Lafayette, IN, U.S.A. (○ Advisor: Prof. Kihong Park)  

· Part-time Lecturer, MS Expert Course, BIT Academy, Korea,     Jan. 2004 – Nov. 2004 
· Teaching Assistant for Data Structure (Prof. Chong-kwon Kim),                     Spring 2003
  Seoul National University, Seoul, Korea 


· M.S./Ph. D. in Computer Science and Engineering, Seoul National University, Aug. 2008. 
· B.S. in Material Science and Engineering, Seoul National University, Feb. 2003.

 Work Experience

· Software Engineer (Programmer),                                                     May 2001 – May 2002
  Hangul & Computer (or Haansoft), Seoul, Korea 

· Software Engineer (Programmer),                                                    Jan. 1999 – May 2001
  Kunnsoft, Seoul, Korea

 Awards & Honors

· Korea Research Fund (KRF) Postdoctoral Scholarship,  Dec. 2008 - Nov 2009
· Silver Prize, 13th Samsung Human-tech Awards Contest, Feb. 2007
· BK-21 Scholarship for studying aboard, Jan. 2006
· Honorable Mention, 10th Samsung Human-tech Awards Contest, Feb. 2004
· Silver Prize (2nd place), YoungJin.com Technical Writer Awards, Oct. 2002
· Appreciation plaque from Haansoft (Hangul & Computer), Mar. 2002
· Award of Commendation from the Ministry of Government Legislation (thanks for developing Automatic Law Revision System as a main programmer), Dec. 2001


- Journal Articles 
· J. Chung, J. Park, C. Kim, and Jaehyuk Choi* "C-SCAN: Wi-Fi Scan Offloading via Collocated Low-Power Radios", IEEE Internet of Things (IoT) Journal, Vol. 5, No. 2, pp 1142-1155, 2018  (*corresponding author)  (IF=7.596, 3.3%) 

· K. W. Choi, Y. S. Choi, Aneta, J. W. Lee, S. M. Cho, and  Jaehyuk Choi*, "Optimal load balancing scheduler for MPTCP-based bandwidth aggregation in heterogeneous wireless environments", Elsevier Computer Communications (COMCOM), Vol. 112, 1, pp. 116–130, Nov. 2017 (*corresponding author) (IF=3.338) 

· Suchul Lee, Jaehyuk Choi*, and et. al., "LARGen: Automatic Signature Generation for Malwares Using Latent Dirichlet Allocation," IEEE Transactions on Dependable and Secure Computing,  Vo. 15, No. 5, pp. 771 - 783, Sep/Oct 2018.  (*corresponding author )  (IF=4.41, 1.92%)

· Jaehyuk Choi, "WidthSense: Wi-Fi Discovery via Distance-based Correlation Analysis", IEEE Communications Letters (CL), Vol. 21, no. 2, Feb. 2017. (IF=1.988)

· W. Kim, Jaehyuk Choi*, "Challenges for wearable healthcare services." IJWGS 12(4): 407-417, 2016

· Kim, W., Jaehyuk Choi*, Jeong, O-R., Han, W-J., Kim, C., Loh, W-K. and Yoo, J. (2015) 'On the Internet of Things', Int. J. Web and Grid Services, Vol. 11, No. 4, pp.410-426, 2015. (*corresponding author )

· Suchul Lee, Jaehyuk Choi, Joon Yoo, and Chong-Kwon Kim, "Frequency Diversity-Aware Wi-Fi Using OFDM-based Bloom Filters,"  IEEE Transactions on Mobile Computing (TMC), Mar. 2015.  (IF=3.822)

· Jaeryong Hwang, Jaehyuk Choi, Joon Yoo, and Chong-kwon Kim, "A Theoretical Approach to Optimal Association Control in Vehicular Wi-Fi Networks," Springer EURASIP Journal on Wireless Communications and Networking (JWCN), vol. 2014, no. 192, Nov. 2014.  (IF=1.529)

· Suchul Lee, Jaehyuk Choi, Joon Yoo, and Chong-Kwon Kim, "Providing Quality-of-Service for Frequency Aware Wi-Fi Using OFDM-based Variable-Length Bloom Filters," Springer EURASIP Journal on Wireless Communications and Networking (JWCN), vol. 2014, no. 152, Sep. 2014.  (IF=1.529)

· Jaehyuk Choi, Ok-Ran Jeong, Woo-Jin Han, Chulyun Kim and Won Kim, “On Cyberattack Mechanisms,” International Journal of Web and Grid Services, vol. 9, no.4, Dec. 2013.

· Hyoil Kim, Jaehyuk Choi, and Kang G. Shin, “Hierarchical Market Competition in a Duopoly Super Wi-Fi Spectrum Market,” IEEE Journal on Selected Areas in Communications (IEEE J-SAC) - Cognitive Radio Series, November 2013.

· Sunwoong Choi, Jaehyuk Choi, and Joon Yoo, MRCT: An Efficient Tag Identification Protocol in RFID Systems with Capture Effect, KSII Transactions on Internet and Information Systems (TIIS), vol. 7, no. 7, July 2013.

· Jaekyuk Choi, Alexander W. Min and Kang G. Shin,On Selfish Configuration in Wi-Fi Tethering, IEEE Communications Letters (CL), vol. 17, no. 5, May 2013

·  Chulyun Kim, Ok-Ran Jeong, Jaehyuk Choi and Won Kim, E-books on the mobile e-reader,” Mobile Information Systems, vol. 9, no. 1, Jan., 2013.

·  Alexander W. Min, Xinyu Zhang, Jaekyuk Choi and Kang G. Shin, "Exploiting Spectrum Heterogeneity in Dynamic Spectrum Market", 
IEEE Transactions on Mobile Computing (TMC), vol. 11, no. 12, pp.2020-2032, Dec., 2012.

· Jaehyuk Choi, and Kang G. Shin, "QoS Provisioning for Large-scale Multi-AP WLANs," in Press Elsevier Ad Hoc Networks, vol. 10, no. 2, pp. 174-185, March, 2012. (IF-1.592)  

· Jiwoong Jeong, Jaehyuk Choi, Sunghyun Choi, and Chong-kwon Kim, "Resolving Intra-Class Unfairness in 802.11 EDCA," Springer Wireless Personal Communications (WPC), vol. 43, no.2, pp. 431-445, Mar. 2012 (SCIE) 

· Jaehyuk Choi, Alexander W. Min, and Kang G. Shin, “A Lightweight Passive Online Detection Method for Pinpointing Misbehavior in WLANs”, IEEE Transactions on Mobile Computing (TMC), vol. 10, no.12, pp. 1681-1693, Dec. 2011 (IF=3.406) 

· Jaeryong Hwang, Jaehyuk Choi, Hwaryong Lee, Joon Yoo, and Chong-kwon Kim, " An Efficient Association Control Method in Vehicular Network with Mobile Hotspots”, KSII Transactions ns on Internet and Information Systems, vol. 5, no. 5, pp. 888-908, May 2011. ( Corresponding author)

· Jaehyuk Choi, Kihong Park, and Chong-kwon Kim, "Analysis of Cross-Layer Interaction in Multirate 802.11 WLANs," IEEE Transactions on Mobile Computing (TMC), vol.8, no.5, pp.682-693, May 2009 (IF=3.406)  

· Sungryoul Lee, Jaehyuk Choi, Jongkeun Na, and Chong-Kwon Kim, "Analysis of Dynamic Low Power Listening Schemes in Wireless Sensor Networks," IEEE Communications Letters (CL), vol.13, no.1, pp.43-45, Jan. 2009 (SCI) 

· Jaehyuk Choi, Jongkeun Na, Yeon-sup Lim, Kihong Park, and Chong-kwon Kim, "Collision-aware design of rate adaptation for multi-rate 802.11 WLANs," IEEE Journal on Selected Areas in Communications (JSAC), vol.26, no.8, pp.1366-1375, Oct. 2008 (SCI) 

· Jaehyuk Choi, Joon Yoo, and Chong-Kwon Kim, "A Distributed Fair Scheduling Scheme With a New Analysis Model in IEEE 802.11 Wireless LANs," IEEE Transactions on Vehicular Technology (TVT), vol.57, no.5, pp.3083-3093, Sep. 2008 (SCI)  

· Jaehyuk Choi, Joon Yoo, and Chong-kwon Kim, "A Novel Performance Analysis Model for an IEEE 802.11 Wireless LAN," IEEE Communications Letters (CL), vol.10, no.5, pp. 335-337, May 2006 (SCI)  

· Jaehyuk Choi, Joon Yoo, Sunghyun Choi, and Chong-kwon Kim, "EBA: an enhancement of the IEEE 802.11 DCF via distributed reservation," IEEE Transactions on Mobile Computing (TMC), vol.4, no.4, pp. 378-390, July-Aug. 2005 (SCI)

- International Conferences 

· Juheon Yi, Weiping Sun, Jonghoe Koo, Seongho Byeon, Jaehyuk Choi, and Sunghyun Choi, "BlueScan: Boosting Wi-Fi Scanning Efficiency Using Bluetooth Radio," to appear in Proc. IEEE SECON 2018, Hong Kong, June 11-13, 2018. (Acceptance ratio: 23.2% = 49/211)

· Sunwoong Choi, Jaehyuk Choi, and Joon Yoo, "An Efficient Anti-Collision Protocol for Tag Identification in RFID Systems with Capture Effect", in Proc. ICUFN 2012, Jul., 2012 

· Jaehyuk Choi, and Kang G. Shin, "Out-of-Band Sensing with ZigBee for Dynamic Channel Assignment in On-the-move Hotspots," in Proc. IEEE ICNP 2011, Oct. 2011. (acceptance ratio: 16.4%=31/189)

· Young-myoung Kang, Jaehyuk Choi, Hayoung Oh, and Chong-kwon Kim, "An MIM-Aware Association Control Scheme for OpenFlow Access Points in NOX Architectures" in Proc. CFI '11: 6th International Conference on Future Internet Technologies, June, 2011.

· Hyoil Kim, Jaehyuk Choi, and Kang G. Shin, "Wi-Fi 2.0: Price and Quality Competitions of Duopoly Cognitive Radio Wireless Service Providers with Time-varying Spectrum Availability," in Proc. IEEE INFOCOM 2011, April 2011.

· Yeonsup Lim, Jaehyuk Choi, and Chong-kwon Kim, "Practical Application of Physical Energy Detection to recognize starvation in 802.11 Wireless Networks", in Proc. ICOIN 2009, Jan., 2009 

· Eunho Yang, Jaehyuk Choi, and Sunglim Lee, "On Selfish Behavior using Asymmetric Carrier Sensing in IEEE 802.11 Wireless Networks", in Proc. IEEE Conference on Local Computer Networks (LCN) 2008, Oct. 2008 

· Jaehyuk Choi, Jongkeun Na, Kihong Park and Chong-kwon Kim,"Adaptive Optimization of Rate Adaptation Algorithms in Multi-Rate WLANs" in Proc. IEEE ICNP'07, Beijing, Chana, Oct., 2007 (acceptance ratio: 14.5%=32/220) 

· Yeonsup Lim, Sangsoon Lim, Jaehyuk Choi, Sungho Cho, Chong-kwon Kim and et al., "A Fire Detection and Rescue Support Framework with Wireless Sensor Networks," in Proc. ICCIT 07 

· Eunho Yang, Jaehyuk Choi, Chong-kwon Kim and et al.,"An Enhanced Rate Adaptation Strategy for IEEE 802.11 Wireless Ad Hoc Networks" in Proc. IEEE WiCOM'07, Shanghai, China, Sep., 2007 

· Jaehyuk Choi, Kihong Park and Chong-kwon Kim,"Cross-layer Analysis of Rate Adaptation, DCF, and TCP in Multi-Rate WLANs," in Proc. IEEE INFOCOM 2007, Anchorage, USA, May 7-11, 2007. (Acceptance ratio: 18%~=252/1400+) 

· Jongkeun Na, Jaehyuk Choi, Seongho Cho, Chong-kwon Kim, et al.,"A Unified Route Optimization Scheme for Network Mobility" , in Proc. PWC 2004 (LNCS 3260), Delft, Netherlands, Sep. 2004 

· Jaehyuk Choi, Joon Yoo, Chong-kwon Kim, "A Closed Queueing Network Model for Describing the Backoff Procedure of the IEEE 802.11 DCF" ACM Mobicom 2004 student poster session, Philadelphia, Pennsylvania, Sep. 2004 (refereed poster) 

- Domestic (Korean) Journals and Conferences 
· Sunwoong Choi, Jaehyuk Choi, and Joon Yoo, "An Efficient Anti-Collision Protocol for Coping with theCapture Effect in RFID Tag Identification", KISSE, Dec. 2011
· Jaehyuk Choi, and Chong-kwon Kim, “A Lightweight Receiver-side Method for Estimating the Number of Contending Terminals in Wi-Fi Networks,” KISSE, Mar. 2011
· Jaehyuk Choi, and Chong-kwon Kim, “Adaptive Rate Adaptation Algorithm in 802.11 WLANs,” in Proc. SWCC 2007, Aug. 2007 
· Jaehyuk Choi, and Chong-kwon Kim, “A New Collision Resolution Method in 802.11 DCF,” in Proc. KISS 2003, Oct. 2003 

- Patents 

· Jaehyuk Choi, “SYSTEM AND METHOD FOR Wi-Fi DETECTION,” 1018382220000, Mar. 3, 2018
· Jaehyuk Choi, Chong-kwon Kim, and et al., “Apparatus and method for deciding on vertical handoff,” US patent US 7773563, Aug. 10, 2010 

 Invited Talks 

· Jaehyuk Choi, “Collision-aware Design of Rate Adaptation in Multi-rate WLANs” 
- Korea University, Oct. 2008 
· Jaehyuk Choi, "Energy-Efficient Design of Wi-Fi Tethering in Battery-powered Mobile Devices"
- Seoul National University, Jul. 2010
· Jaehyuk Choi, “A Lightweight Passive Online Detection Method for Pinpointing Misbehaving Users in Wireless Network Systems” 
- Seoul National University, Feb. 2011
· Jaehyuk Choi, “Exploiting Secondary Low-Power Radios for Better On-the-Move Wireless Internet Connection
” - Korea University, May 2011
· Jaehyuk Choi, “Exploiting Heterogenous Radios for Better On-the-Move Wireless Internet Connection” - Kookmin University, Nov. 2011
· Jaehyuk Choi, “On Mobile Wi-Fi hotspot” - Choong-Ang Univ., Ajou Univ., 2012

 Computer Skill

· Languages: C, C++, Visual C++, Java, Tcl, NesC.
· Statistical Packages: Octave, MATLab. 
· Simulation Tools: network simulator-2 (ns2), ns-3
· Android Programming

 Professional Activities

· Technical Referee: 

 (Journals) IEEE Transactions on Mobile Computing, IEEE Transactions on Vehicular Technology, IEEE Transactions on Wireless Communications, IEEE Networks Magazine, IEEE Communications Letters, Elsevier Computer Communications, Elsevier Performance Evaluation, Springer Wireless Personal Communications, KICS Journal on Communications and Networks; 

· TPC member of IEEE PIMRC (15-), IEEE GLOBECOM (16-), IEEE VTC Spring (17-), ICOIN (11-), ICUFN (12-), WPMC (17), VCSC (12), APWC (13), APWC (13), JCCI (17).