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2003 Ph. D. in Electrical and Computer Engineering, Georgia Institute of Technology, U.S.A.

Rate-adaptive channel coding
Channel coding for storages and communication systems
Channel codes defined on graphs such as low-density-parity-check(LDPC) codes,
Tornado codes, Turbo codes
Information theorical security: Wiretap channel


J. Choi, and J. Ha, H. Jeon "On the Energy Delay Tradeoff of HARQ-IR in Wireless Multiuser Systems," IEEE Transactions on Communications, 2013, accepted

J. Choi, and J. Ha, "On the Energy Efficiency of AMC and HARQ-IR with QoS Constraints," IEEE Transactions on Vehicular Technology, 2013, accepted

H. Jeon, J. Choi, S. W. McLaughlin, and J. Ha, "Channel Aware Encryption and Decision Fusion for Wireless Sensor Networks," IEEE Transactions on Information Forensics and Security, vol.8, no.4, pp.619-625, April 2013

J. Oh, J. Ha, J. Moon, and G. Ungerboeck, "RS-Enhanced TCM for Multilevel Flash Memories," IEEE Transactions on Communications, 2013, accepted

N. Chang, C. Chae, J. Ha, and J. Kang, "Secrecy Rate for MISO Rayleigh Fading Channels with Relative Distance of Eavesdropper," IEEE, Commun. Letters, vol.16, no.9, pp.1408-1411, September 2012

W. Song, J. Choi, and J. Ha, "Perfect Secrecy over Binary Erasure Wiretap Channel of Type-II," IEEE Transactions on Information Forensics and Security, vol. 7, no. 4, pp. 1414-1418, Aug 2012

J. Choi and J. Ha, "On the achievable rate for wideband channels with estimated CSI," Journal of Signal Processing Systems, Volume 66, Number 1,Jan 2012, pp. 75-86

H. Jeon, D. Hwang, J. Choi, H. Lee, and J. Ha, "Secure Type-Based Multiple Access," IEEE Transactions on Information Forensics and Security, vol. 6, no. 3, pp. 763-774, Sep 2011

D. Klinc, J. Ha, S. McLaughlin, J. Barros, and B. Kwak, "LDPC Codes for the Gaussian Wiretap Channel," IEEE Transactions on Information Forensics and Security, vol. 6, no. 3, pp. 532-540, Sep. 2011

H. Jeon, N. Kim, J. Choi, H. Lee, and J. Ha, "Bounds on Secrecy Capacity over Correlated Ergodic Fading Channels at High SNR," IEEE Trans. Inf. Theory, vol. 57, no. 4, pp. 1975-1983, Apr. 2011

H. Jeon, J. Choi, H. Lee, and J. Ha, "Channel-aware energy efficient transmission strategies for large wireless sensor networks," IEEE Signal Process. Letter, vol. 17, no. 7, pp. 643-646, Jul. 2010

C. Jung, J. Choi, and J. Ha, "Asymmetric Power Allocation to Improve Convergence Rate of Iterative Receivers," IEEE Commun. Letter, vol. 13, no. 8, pp. 579-581, Aug. 2009

J. Choi and J. Ha, "Rate optimization to minimize distortion for source-channel coded H-BLAST with SIC decoding," IEEE Commun. Letter, vol.13, no.2, pp. 115-117, Feb. 2009

D. Shin, J. Ha, K. Heo, and H. Lee, "A Stopping Criterion for Low-Density Parity-Check Codes," IEICE Trans Commun. Letters, vol. E91-B, no. 4, pp. 1145-1148, Apr. 2008

J. Cha, J. Ha, and J. Kang, "Low-Complexity Iterative QRD-M Detection Algorithm for V-BLAST Systems", Electronics Letters, vol. 43, issue 24, pp. 1374-1376, Nov. 2007

J. Ha, D. Klinc, J. Kwon, and S. W. McLaughlin, "Layered BP Decoding for Rate-Compatible Punctured LDPC Codes", IEEE Commun. Letter, vol. 11, no. 5, pp. 440-442, May 2007

J. Ha, J. Kim, D. Klinc, and S. W. McLaughlin, "Rate-Compatible Punctured Low-Density Parity-Check Codes with Short Block Lengths", IEEE Trans. Inf. Theory, vol. 52, issue 2, pp. 728-738, Feb. 2006

J. Ha, and S. W. McLaughlin, "Rate-compatible puncturing of low-density parity-check codes", IEEE Trans. Inf. Theory, vol. IT-50, pp.2824-2836, Nov. 2004

J. Ha, and S. W. McLaughlin, "Low-Density Parity-Check Codes over Gaussian Channels with Erasures," IEEE Trans. Inf. Theory, vol. IT-49, pp. 1801-1809, Jul. 2003

H. Pishro-Nik, N. Rahnavard, J. Ha, and F. Fekri, ¡°Low-density parity-check codes for volume holographic memory systems,¡± Applied Optics, vol. 42, pp. 861-870, Feb. 2003

J. Ha, A. N. Mody, J. Sung, J. R. Barry, S. W. McLaughlin, and G. L. Stuber, ¡°LDPC Coded OFDM with Alamouti/SVD Diversity Technique,¡± Wireless Personal Communications, vol. 23, issue 1, pp. 183-194, Oct. 2002


ÇÏÁ¤¼®, ¿ÀÁöÀº, "NAND Flash ¸Þ¸ð¸®¸¦ À§ÇÑ ¿À·ùÁ¤Á¤ºÎÈ£," Çѱ¹Åë½ÅÇÐȸÁö Á¦ 28±Ç 9È£, 58-68, 2011³â 9¿ù

Á¤Ãµ¼º, ±è¿õȯ, Àüµ¿»ê, ¹ÚÇö¿í, ÇÏÁ¤¼®, "°ü½É ¿µ¿ª ±â¹ÝÀÇ Çȼ¿ µµ¸ÞÀÎ ºÐ»ê ºñµð¿À ºÎÈ£," ´ëÇÑÀüÀÚ°øÇÐȸ ³í¹®Áö, Á¦ 47±Ç, SPÆí, Á¦ 4È£, pp. 79-89, 2010³â 7¿ù

¿ÀÁöÀº, Á¤Ãµ¼º, ±èµ¿À±, ¹ÚÇö¿í, ÇÏÁ¤¼®, Transform Domain Wyner-Ziv ºñµð¿À ºÎÈ£¸¦ À§ÇÑ È¿°úÀûÀÎ »ó°ü ä³Î ¸ðµ¨¸µ," ´ëÇÑÀüÀÚ°øÇÐȸ ³í¹®Áö, Á¦ 47±Ç, SPÆí, Á¦ 3È£, pp. 23-31, 2010³â 5¿ù

Ȳ´ë¼º, ±è´ë¼º, ÃÖÁøÈ£, ÇÏÁ¤¼®, "¾ÐÃà °¨Áö ±â¼ú°ú ¹«¼±Åë½Å ÀÀ¿ë," ´ëÇÑÀüÀÚ°øÇÐȸ ³í¹®Áö, Á¦ 46±Ç, SPÆí, Á¦ 5È£, pp. 32-39, 2009³â 9¿ù

J. Ha and D. Klinc, "Low-Density Parity-Check Codes with Rate Adaptability", Telecommun. Review, vol. 16, issue 5, pp. 823-836, Oct. 2006

J. Ha, J. G. Lee, and S. R. Kim, "Power Efficiency Of Dual Channel QPSK for DS-CDMA Systems," Telecommun. Review, vol.8, issue 5, pp.698-707, Sept. 1998



H. Jeon, SW. McLaughlin, J. Ha, "Secure Communications with Untrusted Secondary Users in Cognitive Radio Networks," IEEE GLOBECOM 2012, Anaheim, California, USA, Dec. 2012

D. Kim, J. Choi and J. Ha, "On the Soft Information Extraction from Hard-Decision Outputs in MLC NAND Flash Memory," IEEE GLOBECOM 2012, Anaheim, California, USA, Dec. 2012

J. Choi, S. Li, X. Wang, J. Ha, "A General Distributed Consensus Algorithm for Wireless Sensor Networks," IEEE Wireless Advanced (WiAd), 2012, London, UK, June. 2012

S. Cho and J. Ha, "Concatenated BCH Codes for NAND Flash Memories," IEEE ICC 2012, Ottawa, Canada, June. 2012

J. Choi, J. Ha, "Iterative Distributed Amplitude Optimization for Distributed Detection in Wireless Sensor Networks," Vehicular Technology Conference (VTC Spring), 2012 IEEE 75th , Yokohama, Japan, May. 2012

J. Choi and J. Ha, "Orthogonal Beamforming for overlay mode of OFDMA-based Rural Broadband Wireless Access," Wireless Communications and Networking Conference (WCNC), 2012 IEEE, Paris, France, April. 2012

H. Jeon and J. Ha, "Channel Aware Encryption and Decision Fusion for Wireless Sensor Networks," IEEE WIFS'11, Foz do Iguacu, Brazil, Nov. 2011

M. Hyun, W. Song, J, Choi, S. Yoo, and J. Ha, "Code Design for Type-I Wiretap Channel," Allerton conference on Communication, Control, and Computing, Illinois, USA, Sept. 2011

H. Jeon, S. McLaughlin, and J. Ha, "Cooperative Secure Transmission for Distributed Detection in Wireless Sensor Networks," IEEE MWSCAS'11, Seoul, Korea, Aug. 2011

J, Choi, and J. Ha, "MMSE-based distributed beamforming in cooperative relay networks," IEEE MWSCAS'11, Seoul, Korea, Aug. 2011

J. Nam, G. Caire, and J. Ha, "Block Triangularization: A New Linear Precoding Strategy for Gaussian MIMO BC," IEEE ISIT'11, pp.1733-1737, St. Petersberg, Russia, Aug. 2011

C. Jung, D. Jun, J. Oh, H. Park and J. Ha, "Region-of-Interest based pixel domain Wyner-Ziv coding," IEEE MILCOM'10, vol., pp.283-286, San Jose, CA, USA, Oct. 2010

J. Nam and J. Ha, "New Achievable Rate Region of Gaussian MIMO Broadcast Channels with Linear Precoding," IEEE GLOBECOM 2010, Miami, USA, Dec. 2010

H. Jeon, J. Choi, H. Lee, and J. Ha, "Channel-aware energy efficient transmission strategies for large wireless sensor networks," IEEE GLOBECOM 2010, Miami, USA, Dec. 2010

J. Choi and J. Ha, "On the Asymptotic Performance of TBMA with Multichannel Diversity over Fading Channels," IEEE PIMRC 2010, Turkey, Istanbul, Sep. 2010

H. Jeon, D. Hwang, J. Choi, H. Lee, and J. Ha, "Secure type-based multiple access: transmission strategy and analysis for perfect secrecy," IEEE ITW 2010, Dublin, Ireland, Aug. 2010

D. Klinc, J. Ha, S. McLaughlin, J. Barros, and B. Kwak, "LDPC codes for Physical Layer Security," IEEE Globecom 2009, pp.1-6, Hawaii, USA, Nov. 2009

H. Jeon, N. Kim, J. Choi, H. Lee and J. Ha, "On Multiuser Secrecy Rate in Flat Fading Channel," IEEE MILCOM'09, Boston, MA, USA, Oct. 2009

D. Klinc, J. Ha, S. McLaughlin, J. Barros, and B. Kwak, "LDPC Codes for the Gaussian Wiretap Channel," IEEE ITW 2009, pp.95-99, Taormina, Italy, Oct. 2009

M. Kim, M. Hyun, J. Ha, and H. Oh, "On Enhancement of Error Detection Capability of WAVE Standard," 16th World Congress on ITS, Stockholm, Sweden, Sept. 2009

H. Jeon, N. Kim, M. Kim, H. Lee, and J. Ha, "Secrecy Capacity over Correlated Ergodic Fading Channel," IEEE MILCOM'08, pp.1-7, San Diego, CA, USA, Nov. 2008

D. Klinc, J. Ha, and S. McLaughlin, "Optimized Puncturing and Shortening Distributions for Nonbinary LDPC Codes Over the Binary Erasure Channel," Allerton Conference on Communication, Control, and Computing, pp.1053-1058, Illinois, USA, Sept. 2008

J. Nam, S. Kim and J. Ha, "A New Design of Iterative Detection and Decoding with Soft Interference Cancellation," IEEE VTC'08 Fall, pp.1-6, Calgary, Canada, Sept. 2008

D. Klinc, J. Ha, and S. McLaughlin, "On Rate-adaptivity of Nonbinary LDPC codes," in Proc. of the 5th International Symposium on Turbo Codes & Related Topics 2008, pp.231-236, Lausanne, Switzerland, Sept. 2008

J. Nam, S. Kim and J. Ha, "A Modified Turbo Principle of Iterative Detection and Decoding," IEEE ISIT'08, pp.469-473, Toronto, Canada, July 2008

S. Song, D. Hwang, S. Seo, J. Ha, "Linear-Time Encodable Rate-Compatible Punctured LDPC Codes with Low Error Floors," IEEE VTC'08 Spring, pp.749-753, Marina Bay, Singapore, May 2008

S. Oh, A. Fayziyev, J. Cha, J. Ha, S. Kim, "A New Efficient 16-QAM Mapping Approach for Iterative Receiver using Turbo Codes over SISO Channel," IEEE ICACT 2008, vol.1, pp.421~423, Phoenix Park, Republic of Korea, Feb. 2008

J. Nam, S. Kim, H. Chung, J. Choi, J. Ha, "Cholesky Based Efficient Algorithms for the MMSE-SIC Receiver," IEEE Globecom 2007, pp.3045-3050, Washington.DC, USA, Nov. 2007

J. Kwon, D. Klinc, J. Ha, W. McLaughlin, "Fast Decoding of Rate-Compatible Punctured LDPC Codes," IEEE ISIT 2007, pp.216-220, Nice, France, June 2007

D. Shin, K. Heo, S. Oh, J. Ha, "A Stopping Criterion for Low-Density Parity-Check Codes," IEEE VTC'07 Spring, pp.1529-1533, Dublin, Ireland, April 2007

K. Chang, Y. Han, J. Ha, Y. Kim, "Cancellation of ICI by Doppler effect in OFDM systems," IEEE VTC'06 Spring, vol.3, pp.1411-1415, Melbourne, Australia, May 2006

D. Klinc, J. Ha, J. Kim, S. W. McLaughlin, "Rate-Compatible Punctured Low-Density Parity-Check Codes for Ultra Wide Band Systems," IEEE Globecom 2005, pp. 3856-3860, St. Louis, MO, USA, Nov. 2005

J. Ha, J. Kim, S. W. McLaughlin, ¡°Puncturing for finite length low-density parity-check codes,¡± Proc. of the IEEE ISIT 2004, p.151, Chicago, USA, July 2004

J. Ha, S. W. McLaughlin, ¡°Optimal rate compatible puncturing of LDPCs,¡± Proc. of the IEEE ISIT 2003, p.233, Yokohama, Japan, July 2003

J. Ha, S. W. McLaughlin, ¡°Optimal Puncturing Distributions for Irregular Low-Density Parity-Check Codes,¡±IEEE ICC 2003, vol. 5, pp.3110-3114, Seattle, USA, May 2003

J. Ha, S. W. McLaughlin, "Analysis and Design of Punctured LDPCCs over Gaussian Channel with Erasures," Proc. of the IEEE ISIT 2002, p.30, Lausanne, Switzerland, July 2002

J. Ha, A. N. Mody, J. Sung, J. R. Barry, S. W. McLaughlin, and G. L. Stuber, ¡°LDPC Coded OFDM with Alamouti/SVD Diversity Technique,¡± WPMC'01, pp.1345-1350, Aalborg, Denmark, Sept. 2001

J. W. Chung, J. S. Kim, Y. G. Jeong, and J. Ha, "Implementation of Code Acquisition and Code Tracking Loop for CDMA Wireless Local Loop System," IEEE VTC'98, pp.1204-1208, Ottawa, Canada, May 1998

S. R. Kim, J. G. Lee, S. Kang, and J. Ha, "Pilot Channel aided Dual-Channel QPSK for CDMA Reverse Links," APCC'97, Sydney, Australia, Dec. 1997

J. Jeong, J. Kim, Y. Jeong, and J. Ha, "Implementation of Base Station Receiver for CDMA Wireless Local Loop System," IEEE ICPWC'97, Mumbay, India, Dec. 1997

S. R. Kim, J. G. Lee, S. Kang, and J. Ha, "Pilot Symbol Aided Dual-Channel QPSK (PSADC QPSK) for CDMA Reverse Links," 2nd CIC, vol. 2, pp.174-178, Seoul, Korea, Oct. 1997

J. Ha, J. G. Lee, S. R. Kim, and H. Lee, "Performance Evaluation of a CDMA Wireless Local Loop System," APCC'97, Sydney, Australia, Dec. 1997

J. Ha, J. Lee, S. Kim, and H. Lee, "Design and performance evaluation of a CDMA wireless local loop," ITC-CSCC'97, vol. 2, pp. 1131-1134, Okinawa, Japan, July 1997

J. Ha, S. Kim, J. Lee, and H. Lee, "Signal constellation of modulation schemes for CDMA reverse link," ITC-CSCC'97, vol. 2, pp.1127-1130, Okinawa, Japan, July 1997

D. Rhu, J. Kim, G. Ha, J. Lee, J. Kim, Y. Jeong, J. Ha, and N. J. Park, "Implementation of Wideband CDMA Modem Using Processors and Programming Logic Devices," ISCA'97, vol. 4, pp.2613-2616, Denver, Colorado, June 1997

B. Kang and J. Ha, "Performance of a multi-carrier DS/CDMA system with diversity in a Rayleigh fading channel," ICCS'96, pp.14.4.1-14.4.5, 1996

B. Kang and J. Ha, "A multiple-carrier DS/CDMA system with maximal ratio combining in a mobile radio channel," MDMC96, pp. 749-753, 1996

B. Kang and J. Ha, "The performance of a Multi-Carrier DS/CDMA System with Maximal Ratio Combining Diversity," ITC-CSCC96, pp. 432-436, 1996

B. Kang and J. Ha, "Effect of Diversity and FEC Coding on DS/CDMA Mobile Radio System," ICW, pp.53-565, 1995


¿ÀÁöÀº, ÇÏÁ¤¼®, "Flash Memory¸¦ À§ÇÑ ¿¬Á¢ ºÎÈ£," 2011 ÇϰèÁ¾ÇÕÇмú´ëȸ, ´ëÇѹα¹, Á¦ÁÖµµ, 2011³â 6¿ù

±è¿õȯ, Á¶¼º±Ù, ÇÏÁ¤¼®, "´ë¿ë·® SSD¸¦ À§ÇÑ MLC NAND Flash ¸Þ¸ð¸® ä³Î¿¡¼­ÀÇ ÃÖÀû ¾çÀÚÈ­ ¹æ¹ý," 2011 ÇϰèÁ¾ÇÕÇмú´ëȸ, ´ëÇѹα¹, Á¦ÁÖµµ, 2011³â 6¿ù

ÀÓ»óÈÆ, ÇÏÁ¤¼®, "A Study on Secret Key Extraction System Based on the Reciprocity of Channel," JCCI 2011, ´ëÇѹα¹, ºÎ»ê, 2011³â 5¿ù

Ȳ´ë¼º, ÀüÇü¼®, ÀÌÇõÀç, ÇÏÁ¤¼®, "Secure Type-Based Multiple Access with Power Control," JCCI 2011, ´ëÇѹα¹, ºÎ»ê, 2011³â 5¿ù

Ä«À̽º ¾ÆÁÖÁö, °­µ¿Çù, ÇÏÁ¤¼®, "A design of faster stochastic decoder for low-density parity-check codes," JCCI 2010, ´ëÇѹα¹, ¾È¸éµµ, 2010³â 4¿ù

ÀüÇü¼®, ±è¹Î±â, Çö¸íÇØ, ÇÏÁ¤¼®, ÀÌÇõÀç, "»ó°ü ÆäÀ̵ù ä³Î¿¡¼­ÀÇ º¸¾È ¿ë·®," 2008 Ãß°è Á¾ÇÕÇмú¹ßǥȸ, ´ëÇѹα¹, ¼­¿ï, 2008³â 11¿ù




Error Correcting Methods and Circuit over Interference Channel Environment, Flash Memory Device Using the Circuits and Methods, "the Application Number : PCT/KR2012/010439, Application Date : 2012-11-30"
Method for puncturing an LDPC channel code, US Patent, "Patent Number : 7657824, Issue Date : 2010-02-02"
Channel encoding apparatus and method, US Patent, "Patent Number : 7451385, Issue Date : 2008-11-11"
Method for puncturing an LDPC channel code, German, French Patent, "Patent Number : 1653629, Issue Date : 2006-05-03"

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