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Patents<\/strong><\/p>\n

    \n
  1. A. Khalajmehrabadi, N. Gatsis, D. Akopian, \u201cSystems and Methods for Wireless Local Area Network Localization,\u201d Patent application 62\/408,665, 10.14.2016<\/li>\n
  2. D. Akopian, R. Escobar, S. Kaghyan, \u201cInteractive Mobile Service for Deploying Automated Protocols,\u201d US Patent application 62\/376,445, 08.18.2016<\/li>\n
  3. D. Akopian, CJ Qian, D. Park, \u201cSystems and Methods for a Mobile UAV-Based Emergency Communications Scanner,\u201d Patent application 15194356, 06.27.2016<\/li>\n
  4. D. Akopian, G. Huang, C.L.P. Chen, \u201cMethod and System for Measurement and Characterization of Channel Delays for Broadband Power Line Communications,\u201d WO\/2016\/127048; PCT\/US2016\/016763, 11.08.2016<\/li>\n
  5. D. Akopian, A. Melkonyan, M. Pontual, G. Huang; A. Gampe. \u201cRemote Laboratory Gateway\u201d. US Patent Application 20130117019 A1, May 9, 2013<\/li>\n
  6. D. Akopian. \u201cDetermination of correlation in the frequency domain.\u201d EP1692775A1, US20050128937<\/li>\n
  7. D. Akopian, \u201cDetermination of the code phase between a code modulated signal and a replica code sequence,\u201d US2004\/0141574A1, 06.05.2004<\/li>\n
  8. C. Lacatus, D. Akopian, M. Shadaram, \u201cCrosscorrelation interference mitigating position estimation systems and methods therefor\u201d, US Patent 8,548,106, Oct. 1, 2013<\/li>\n
  9. S. Agaian, D. Akopian, et al. Methods and systems for digital image security. US Patent 8,369,568, Feb.5, 2013<\/li>\n
  10. S. Agaian, D. Akopian, et al. Methods and systems for digital image security. US Patent 7,965,861, June.21, 2011<\/li>\n
  11. D. Akopian, H. Valio. Preventing an incorrect synchronization between a received code-modulated signal and a replica code. US Patent 7,876,738, Jan 25, 2011<\/li>\n
  12. D. Akopian, S. Turunen, S. Pietila, H. Valio, \u201cAcquisition of a code modulated signal,\u201d US Patent 7,336,696. Feb. 26, 2008.<\/li>\n
  13. D. Akopian, \u201cDetermination of the correlation phase between a signal and a replica sequence,\u201d US Patent 7,286,594. Oct. 23, 2007.<\/li>\n
  14. D. Akopian, H. Valio, S. Pietila, J. Syrjarinne, \u201cValidation of beacon signals,\u201d US Patent 7,064,708. June 20, 2006.<\/li>\n
  15. D. Akopian, H. Vallio, J. Syrjarinne, \u201cPosition estimation,\u201d US Patent 6,894,645. May 17, 2005.<\/li>\n
  16. D. Akopian, H. Valio, \u201cTracking a code modulated signal,\u201d US Patent 7,124,352. Oct. 17, 2006.<\/li>\n
  17. D. Akopian, \u201cDetermining the correlation between received samples and available replica samples,\u201d US Patent 7,277,476, Oct. 2, 2007<\/li>\n
  18. D. Akopian, \u201cDetermining the correlation between received samples and available replica samples,\u201d US Patent 7,272,168, Sep. 18, 2007.<\/li>\n
  19. D. Akopian, \u201cMethod and apparatus for acquiring a ranging signal of a positioning system,\u201d US Patent 7,120,191. October 10, 2006.<\/li>\n
  20. D. Akopian, K. Ilkka, H. Valio, S. Turunen \u201cMethod in a receiver and a receiver,\u201d US Patent 6,909,738, Jun. 21, 2005.<\/li>\n
  21. D. Akopian, H. Valio, S. Turunen \u201cSystem for method for fine acquisition of a spread spectrum signal,\u201d US Patent 6,909,736, Jun. 21, 2005.<\/li>\n
  22. D. Akopian, J. Syrjarinne, \u201cPosition Estimation,\u201d US Patent 6894645, May 17, 2005.<\/li>\n
  23. D. Akopian, J. Syrjarinne, \u201cMethod, receiver and system for determining the time of reception of a beacon signal,\u201d US Patent 6,833,813, Dec. 21, 2004.<\/li>\n
  24. D. Akopian, \u201cSystem for acquiring spread spectrum signals,\u201d US Patent 6,810,072, Oct. 26, 2004<\/li>\n
  25. D. Akopian, H. Valio, \u201cDetermination of the transmission time of a signal part in a positioning system,\u201d US Patent 6,771,215, August 3, 2004.<\/li>\n
  26. D. Akopian, J. Syrjarinne, \u201cMethod for determining the correlation between a received beacon signal and a reconstructed signal,\u201d US Patent 6,768,451, July 27, 2004.<\/li>\n
  27. D. Akopian, \u201cMethod, apparatus and system for fast acquisition of a spread spectrum signal,\u201d US Patent 6,735,243, May 11, 2004.<\/li>\n
  28. D. Akopian, \u201cMethod for providing time using multiple-clock model and a clock system using such a model\u201d, US Patent 6,651,031, November 18, 2003.<\/li>\n
  29. D. Akopian, \u201cClock system and corresponding method for providing a clock time accounting for systematic error\u201d, US Patent 6,573,799, June 3, 2003.<\/li>\n
  30. D. Akopian, J. Syrjarinne, \u201cMethod, apparatus and system for estimating user position with a satellite positioning system in poor signal conditions\u201d, US Patent 6,473,694, October 29, 2002.<\/li>\n
  31. D. Akopian, J. Syrjarinne, \u201cMethod and apparatus for calculating pseudorange for use in ranging receivers\u201d, US Patent 6,466,164, October 15, 2002.<\/li>\n
  32. D. Akopian, J. Syrjarinne, \u201cCross-correlation system for time recovery in network-assisted GPS positioning\u201d, US Patent 6,459,407, October 1, 2002.<\/li>\n<\/ol>\n

    Books, Edited Books\/Proceedings, Book Chapters<\/strong><\/p>\n

      \n
    1. Mobile Devices and Multimedia: Enabling Technologies, Algorithms, and Applications 2016, Reiner Creutzburg; David Akopian, Editors, IS&T, ISSN 2470-1173.<\/li>\n
    2. Mobile Devices and Multimedia: Enabling Technologies, Algorithms, and Applications 2015, Reiner Creutzburg; David Akopian, Editors, Proceedings of SPIE Vol. 9411<\/li>\n
    3. J. Morales, S. Kaghyan, D. Akopian, S. Agaian, \u201cHuman activity recognition and processing for mobile applications,\u201d Chapter 8 in Mobile Imaging, SPIE, 2016<\/li>\n
    4. Mobile Devices and Multimedia: Enabling Technologies, Algorithms, and Applications 2014 (Editors: R. Creutzburg, D. Akopian)<\/li>\n
    5. SPIE: Multimedia content and mobile devices (Editors: N. Sebe, R. Creutzburg, A. Lumsdane, D. Akopian, C.G.M. Snoek, D. Wuller, 2013)<\/li>\n
    6. SPIE Multimedia on Mobile Devices, Editors: R. Creutzburg, D. Akopian, 2012<\/li>\n
    7. SPIE Multimedia on Mobile Devices, Editors: R. Creutzburg, D. Akopian, 2011<\/li>\n
    8. SPIE Multimedia on Mobile Devices, Editors: R. Creutzburg, D. Akopian, 2010<\/li>\n
    9. SPIE Multimedia on Mobile Devices, Editors: R. Creutzburg, D. Akopian, 2009<\/li>\n
    10. D. Akopian, Systematic Approaches to Parallel Architectures for DSP Algorithms, 1997, Acta Politechnica Scandinavica, EI 89, Espoo, Finland, ISBN 952-5148-29-7<\/li>\n
    11. D.Akopian, J. Takala, J.Saarinen, J. Astola, “Multistage interconnection networks for parallel Viterbi decoders,” Proceedings of First International Workshop on Spectral Techniques and Logic Design for Future Digital Systems, Chapter in TICSP Series #10, December 2000, pp.131-155.<\/li>\n
    12. D. Akopian, M. Helsingius & J. Astola,”Multibase Approaches for Compression of Still Images,” Chapter in TICSP Series 4, International Workshop on Transforms and Filter Banks (WTFB’99), March 5-7, 1999, Brandenburg an der Havel, Germany, 16p.<\/li>\n
    13. D. Akopian and J. Astola, “Fast architecture oriented algorithms for trigonometric transforms and their mapping to scalable structures,” First International Workshop on Transforms and Filterbanks, Chapter in TICSP Series-1, June 1998, pp. 433-471.<\/li>\n<\/ol>\n

      Journal Papers<\/strong><\/p>\n

        \n
      1. A. Khalajmehrabadi, N. Gatsis, D. Pack, D. Akopian, \u201cCollaborative Least Squares Localization\u201d, submitted to IEEE Transactions on AES, Jan 2017.<\/li>\n
      2. A. Khalajmehrabadi, N. Gatsis, A. Taha, D. Akopian, \u201cReal-Time Rejection and Mitigation of Time Synchronization Attacks on the Global Positioning System,\u201d submitted IEEE Transactions on Industrial Electronics, June 2017.<\/li>\n
      3. (in-press) A. Khalajmehrabadi, N. Gatsis, D. Akopian, \u201cStructured Group Sparsity: A Novel Indoor WLAN Localization, Outlier Detection, and Radio Map Interpolation Scheme,\u201d IEEE Trans. on Vehicular Technology, 2016, DOI: 10.1109\/TVT.2016.2631980<\/li>\n
      4. (early access) A. Khalajmehrabadi, N. Gatsis, D. Akopian, \u201cModern WLAN fingerprinting indoor positioning methods and deployment challenges,\u201d IEEE Communications Surveys & Tutorials, DOI: 10.1109\/COMST.2017.2671454<\/li>\n
      5. A. Khalajmehrabadi, N. Gatsis, D. Akopian, \u201cA Joint Indoor WLAN Localization and Outlier Detection Scheme Using LASSO and Elastic-Net Optimization Techniques,\u201d IEEE Trans. on Mobile Computing, Vol. 1, No 8, pp.2079-2092, 2017, DOI: 10.1109\/TMC.2016.2616465<\/li>\n
      6. (in-press) A. Khalajmehrabadi, N. Gatsis, D. Akopian, \u201cA Joint Indoor WLAN Localization and Outlier Detection Scheme Using LASSO and Elastic-Net Optimization Techniques,\u201d IEEE Trans. on Mobile Computing, 2017, DOI: 10.1109\/TMC.2016.2616465<\/li>\n
      7. J. Morales, D. Akopian, \u201cPhysical activity recognition by smartphones, a survey,\u201d Elsevier Biocybernetics and Biomedical Engineering Journal, Vol. 37, No.3, doi.org\/10.1016\/j.bbe.2017.04.004, 2017<\/li>\n
      8. G.Huang, M.M. Miller, D.Akopian, \u201cInference of Network Delays for SUPL3.0 Assisted GNSS,\u201d GPS Solutions, (2016). doi:10.1007\/s10291-016-0549-6<\/li>\n
      9. J. Morales, D. Akopian, \u201cHuman activity tracking by mobile phones through Hebbian Learning,\u201d Int. Journal of Artificial Intelligence and Applications, Vol.7, No.6. Nov. 2016, DOI: 10.5121\/ijaia.2016.7601<\/li>\n
      10. J. Morales, D. Akopian, S. Agaian, \u201cDual polynomial thresholding for transform denoising in application to local pixel grouping method,\u201d The Int. Journal of Multimedia & Its Applications (IJMA), Vol. 8., No.1, Feb 2016, DOI : 10.5121\/ijma.2016.8101.<\/li>\n
      11. J. Morales, D. Akopian, S. Agaian, \u201cMitigating anomalous measurements for indoor WLAN positioning,\u201d IET Radar Sonar and Navigation, Vol. 10, No.7, pp. 1220-1227, 2016.<\/li>\n
      12. A.M.Mayers, P. Benavidez, D. Akopian, GVS Raju, M. Jamshidi, \u201cA closed loop transmission power control system using a nonlinear approximation of power-time curve,\u201d IEEE Systems Journal, Vol.9, No.3, pp.1011-1019, 2015<\/li>\n
      13. G.Huang, D. Akopian, and C.L. P. Chen, \u201cNetwork Delay Modeling for Assisted GPS\u201d IEEE Trans. Aerospace and Electronic Systems, Vol.51,No.1, pp.52-64, 2015<\/li>\n
      14. J. Morales, D. Akopian, S. Agaian, \u201cFaulty measurements impact om wireless local area network positioning performance,\u201d IET Radar Sonar and Navigation Journal, Vol.9, No.5, pp.501-508, 2015<\/li>\n
      15. G.Huang, D. Akopian, and C.L. P. Chen, \u201cStatistical Characterization of Channel Delays for Broadband Power Line Communications,\u201d IEEE Trans. on Instrumentation and Measurement, Vol. 63, No.1, pp. 2583 \u2013 2590, 2014<\/li>\n
      16. A. Soghoyan, A. Suleiman, D. Akopian, “A LabVIEW Based GPS Receiver Development and Testing Platform With FPGA Peripherals: Case Study With FlexRIO FPGA Module”, IEEE Trans. on Instrumentation and Measurement, Vol. 63, No.8, pp. 2001-2012, 2014<\/li>\n
      17. G.Huang, D. Akopian, and C.L. P. Chen, \u201cMeasurement and Modeling of Network Delays for MS-based A-GPS Assistance Delivery,\u201d IEEE Trans. on Instrumentation and Measurement, Vol. 63, No. 8, pp. 1896-1906, 2014.<\/li>\n
      18. C. Mojica, D. Parra-Medina, D. Akopian, \u201cAccessing media access and use among Latina adolescents to inform development of a physical activity promotion intervention incorporating text-messaging,\u201d SAGE Health Promotion Practice, Dec 19, 2013, doi:10.1177\/1524839913514441<\/li>\n
      19. A. Melkonyan, D. Akopian, \u201cAssessment of Template-Based Learning in Application Development for Smart Phones\u201d, IEEE Technology and Engineering Education Magazine (formerly Multidisciplinary Engineering Education Magazine), Vol.8, No.3, pp.20-28, 2013<\/li>\n
      20. A. Melkonyan, A. Gampe, M. Pontual, G. Huang, D. Akopian, \u201cAn assessment of remote laboratory experiments in radio-communication,\u201d IEEE Trans. on Education, Vol.57, No.1, pp.12-19, Feb. 2014<\/li>\n
      21. A. Melkonyan, A. Gampe, M. Pontual, G. Huang, and D. Akopian, \u201cFacilitating Remote Laboratory Deployments Using Relay Gateway Server Architecture\u201d, IEEE Transaction on Industrial Electronics, Vol. 61, No. 1, pp. 477-485, 2014.<\/li>\n
      22. D. Akopian, A. Melkonyan, S.C. Golgani, T.T. Yuen, and C. Saygin, \u201cA Template-Based Short Course Concept on Android Application Development\u201d, JITE: Research, Vol. 12, pp. 13-28, 2013 (cites\/paper 11.4, h-index 28).<\/li>\n
      23. D. Akopian, P. Sagiraju, B. Nowak, \u201cFast time-recursive block correlators for pseudorandom sequences,\u201d IEEE Trans. on Circuits and Systems I, Vol. 60, No.7, 2013, pp.1835-1844<\/li>\n
      24. A. Soghoyan, D. Akopian, “A LabVIEW-Based GPS Receiver Development and Testing Platform with DSP Peripherals: Case study with C6713 DSK”, Journal of Global Positioning Systems, Vol.11, No.2, pp.127-144, 2012.<\/li>\n
      25. M. Shadaram, D. Akopian, G. H. S. Carvalho: Guest Editors’ Introduction to the Special Issue on The design and analysis of wireless systems: New inspirations. Elsevier Computers & Electrical Engineering 38(3): 471-472 (2012)<\/li>\n
      26. T. Yuen, C. Saygin, H. Shipley, H. Wan, and D. Akopian, \u201cFactors that Influence Students to Major in Engineering,\u201d International Journal of Engineering Education, (IF 0.3) Vol. 28, No. 4, 2012, pp.1-7.<\/li>\n
      27. C. Lacatus, D. Akopian, M. Shadaram, \u201cReduced complexity crosscorrelation interference mitigation in GPS- enabled collaborative ad-hoc wireless networks \u2013 Theory,\u201d Computer and Electrical Engineering Journal, Elsevier, May 2012, Vol. 38, No.3, 2012, pp. 603-615.<\/li>\n
      28. A. Panchul, D. Akopian, M. Jamshidi, \u201cTemporal-Spatial Fuzzy Logic Algorithm for Effective Dynamic Load Balancing in Distributed 3D Graphics Engine,\u201d International Journal of System of Systems Engineering, Vol. 2, No. 4, 2011, pp. 309-328<\/li>\n
      29. D. Akopian, A. Melkonyan, C.L.P. Chen, “Validation of HDOP Measure for Impact Detection in Sensor Network-Based Structural Health Monitoring” IEEE Sensors Journal, Vol. 9, No 9, 2009, pp.1098\u20131102<\/li>\n
      30. D. Akopian, J. Syrjarinne, “A Fast Positioning Method Without Navigation Data Decoding for Assisted GPS Receivers,” IEEE Transactions on Vehicular Technology, Vol. 58, No. 8, 2009, pp. 4640 \u2013 4645.<\/li>\n
      31. C. Lacatus, P. Yaddanapudi, D. Akopian, M. Shadaram, \u201cDynamic spectrum and power allocation for unlicensed wireless systems,\u201d IEEE Systems Journal, Vol. 3, No. 2, 2009, pp. 254-264.<\/li>\n
      32. C. Lacatus, D. Akopian, M. Shadaram, \u201cReduced complexity for optimal spreading sequence design,\u201d IEEE Transactions on Circuits and Systems – II, Vol.55, No.12, Dec. 2008, pp. 1309-1313.<\/li>\n
      33. P. Sagiraju, G.V.S. Raju, D. Akopian, \u201cFast acquisition implementation for high sensitivity global positioning system receivers based on joint and reduced space search,\u201d IEE Proceedings on Radar, Sonar, and Navigation, Vol. 2, No. 5, Oct. 2008 pp. 376 \u2013 387<\/li>\n
      34. C. Smith, S. Agaian, D. Akopian, \u201cA wavelet-denoising approach using polynomial threshold operators,\u201d IEEE Signal Processing Letters, Vol. 15, 2008, pp. 906 \u2013 909<\/li>\n
      35. D. Akopian and S. Agaian, \u201cA fast time-recursive correlator for DSSS systems,\u201d IEEE Signal Processing Letters, Vol. 15, 2008, pp. 589 \u2013 592<\/li>\n
      36. D. Akopian, \u201cOn optimal bit allocation for classification-based source-dependent transform coding,\u201d Research Letters in Signal Processing, vol. 2008, ID 421650. (available at www.hindawi.com)<\/li>\n
      37. D. Akopian and S. Agaian, \u201cFast matched Filters in Time Domain,\u201d IEE Proceedings on Radar, Sonar & Navigation, vol 153, No.6, Dec 2006, pp. 525-531. (IEEE Xplore)<\/li>\n
      38. P. Sagiraju, S. Agaian, D. Akopian, \u201cA Reduced Complexity Acquisition of GPS Signals for Software Embedded Applications\u201d IEE Proceedings on Radar, Sonar & Navigation, Vol. 153, No.1, Feb 2006, pp. 69-78. (available at IEEEXplore)<\/li>\n
      39. D. Akopian, \u201cFast FFT Based GPS Satellite Acquisition Methods\u201d IEE Proceedings on Radar, Sonar & Navigation, Vol. 152, No. 4, August 2005, pp. 277-286. (available at IEEEXplore, a top accessed paper since publication)<\/li>\n
      40. D. Akopian and J. Astola, “An optimal nonlinear extension of linear filters based on distributed arithmetic,” IEEE Transactions on Image Processing, Vol. 14, Issue 5, May 2005, pp. 616-623.<\/li>\n
      41. H. Sairo, D. Akopian, J. Takala, \u201c Weighted dilution of precision as quality measure in satellite positioning\u201d, Radar, Sonar and Navigation, IEE Proceedings, Vol. 150 , Issue: 6 , 1 Dec. 2003, pp: 430 \u2013 436. (available at IEEEXplore)<\/li>\n
      42. D. Akopian, J. Takala, J. Saarinen, J. Astola, “Multistage interconnection networks for parallel Viterbi decoders,” IEEE Transactions on Communications, Vol. 51, No.9, Sep 2003, pp.1536-1545.<\/li>\n
      43. J. Takala, D. Akopian, J. Astola, J. Saarinen “Constant geometry algorithm for Discrete Cosine Transform” IEEE Transactions On Signal Processing, vol. 48, No.6, June 2000, pp. 1840-1843<\/li>\n
      44. J. Astola and D. Akopian, “Architecture oriented regular algorithms for a class of trigonometric transforms,” IEEE Transactions Signal Processing., April 1999, pp. 1109-1124<\/li>\n
      45. J. Astola, D. Akopian, “A time-recursive implementation of threshold Boolean filters,” IEEE Trans. Circuits and Systems II, February 1999, pp. 139-148.<\/li>\n
      46. J. Astola, D. Akopian, O. Vainio, S. Agaian, “Digit-serial architectures for stack filters,” EURASIP Signal Processing Journal, in vol. 61, pp. 181-197, September 1997.<\/li>\n
      47. D. Akopian, O. Vainio, S. Agaian, and J. Astola, “SBNR processor for stack filters,” IEEE Trans. Circuits and Systems II, vol. 44, pp. 197-208, Mar. 1997.<\/li>\n
      48. D. Akopian, O.Vainio, J.Astola, “Processors for generalized stack filters,” IEEE Trans. On Signal Processing, vol. 43, no. 6, pp. 1541-1546, June, 1995.<\/li>\n<\/ol>\n

        Invited Talks and Presentations<\/strong><\/p>\n

          \n
        1. D. Akopian, \u201cIndoor Location Technologies\u201d IEEE WISPNET Conference, 22-24 March 2017, Chennai, India<\/li>\n
        2. D. Akopian, Ali Khalajmehrabadi, N. Gatsis, \u201cIntroduction to WLAN-Based Indoor Positioning of Mobile Devices,\u201d IS&T EI Mobile Devices and Multimedia: Enabling Technologies, Algorithms, and Applications 2017, Jan 29-Feb2. 2017. Burlingame, CA<\/li>\n
        3. D. Akopian, \u201cAdvanced Messaging Solutions for Mobile Health Promotion Research, \u201c Invited Presentation at Biowireless Research in Texas towards m-Health, Radio & Wireless Week, 24-27 January 2016, Austin, TX<\/li>\n
        4. D. Akopian, A. Soghoyan, \u201cA LabVIEW-Based Fast Prototyping Software Defined GPS Receiver Platform,\u201d GlobalSIP 2013, Dec 3-5, 2013, Austin, TX (Invited to Sofware Defined and Cognitive Radios Symposium)<\/li>\n
        5. D. Akopian, V. Jayaram, L. Aaleswara, M. Esfahanian, C. Mojica, D. Parra-Medina, S. Kaghyan, \u201dMobile Text Messaging Solutions for Obesity Prevention,\u201d SPIE Electronic Imaging\/Multimedia on Mobile Devices Conference, Jan 24-27, San Francisco, CA, 2011.<\/li>\n
        6. D. Akopian, WLAN positioning and related topics, Southwest Research Institute, Nov 2010<\/li>\n
        7. Invited Keynote Speaker. Assisted GPS Technology, Association of Old Crows, Joint Electronic Warfare Center, Lackland Base, San Antonio, Jan 15, 2010<\/li>\n
        8. A. Kumar, D. Akopian, S. Agaian, R. Creutzburg, \u201cA mobile-to-server link for wireless steganography,\u201d SPIE Electronic Imaging\/Multimedia on Mobile Devices Conference, San Jose, CA, Jan 2009.<\/li>\n
        9. D. Akopian. Invited Speaker. 2009 National Instruments Week. Using NI Equipment to Enhance Education and Research. A Case Experience at UTSA, August 2009. Austin, TX.<\/li>\n
        10. D. Akopian, Introduction to A-GPS Positioning, IEEE Signal Processing and Communications Chapter, IEEE SMC Chapter, San Antonio, TX, Spring 2009<\/li>\n
        11. D. Akopian, \u201cSatellite positioning systems,\u201d presented at American University of Armenia, and the Institute of Problems of Informatics and Cybernetics, Yerevan Armenia, June 2007.<\/li>\n
        12. D. Akopian, “Mapping of fast transform algorithms to scalable structures,” Short Course, Summer School on Multimedia and Computer Networking, Mangalia, Romania, 2-9 Aug. 1998.<\/li>\n<\/ol>\n

          Other (refereed):<\/strong><\/p>\n

            \n
          1. J.Morales, R.Escobar, S.Kaghyan, G.Natarajan, D.Akopian, P. Chalela, A. Ramirez, A. McAlister, \u201cTwo-tier state-machine programming for messaging applications,\u201d IS&T Int. Symposium on Electronic Imaging: Mobile Devices and Multimedia, Jan 29 \u2013 Feb 2, 2017, Burlingame, CA.<\/li>\n
          2. A. Khalajmehrabadi, N. Gatsis, D. Akopian, \u201cIndoor WLAN localization using group sparsity optimization technique,\u201d 2016 IEEE\/ION Position, Location and Navigation Symposium (PLANS), 2016, pp. 584 – 588, DOI: 10.1109\/PLANS.2016.7479749<\/li>\n
          3. A. Khalajmehrabadi, N. Gatsis, D. Akopian, \u201cRange-based trilateration using multipurpose cost function optimization with Lagrangian multipliers,\u201d 2016 IEEE\/ION Position, Location and Navigation Symposium (PLANS),2016, pp. 118 – 121, DOI: 10.1109\/PLANS.2016.7479690<\/li>\n
          4. G. Huang, M.M. Mikel, D. Akopian, \u201cNetwork Delay Modeling and Estimation for A-GNSS Supports Over Cellular Networks,\u201d ION-ITM 2016, Jan 25-28, Monterey, CA.<\/li>\n
          5. B. Kelley, G. De La Torre Parra, D. Akopian, \u201cCognitive inference avoidance in 4th generation GPS,\u201d 10th IEEE System of Systems Engineering Conference (SoSE), May 17-20, 2015, San Antonio, TX, pp.410-415, 2015<\/li>\n
          6. Sahak Kaghyan, David Akopian, Hakob G. Sarukhanyan, “Platform-dependent optimization considerations for mHealth applications”, Proceedings of SPIE Vol. 9411, 94110K (2015) SPIE Digital Library<\/li>\n
          7. Erick Schmidt, David Akopian, “Indoor positioning system using WLAN channel estimates as fingerprints for mobile devices”, Proceedings of SPIE Vol. 9411, 94110R (2015) SPIE Digital Library<\/li>\n
          8. Rodrigo Escobar, David Akopian, Rajendra Boppana, “A sensor data format incorporating battery charge information for smartphone-based mHealth applications”, Proceedings of SPIE Vol. 9411, 941103 (2015) SPIE Digital Library<\/li>\n
          9. Lakshmipathi Aaleswara, David Akopian, Anthony T. Chronopoulos, “A privacy protection for an mHealth messaging system”, Proceedings of SPIE Vol. 9411, 94110S (2015) SPIE Digital Library<\/li>\n
          10. S. Agaian, M. Roopaei, D. Akopian, \u201cThermal-image quality measurements,\u201d IEEE ICASSP\u20192014 Conference, Florence, Italy, May 4-9, 2014, pp.2761-2765,<\/li>\n
          11. R.G. Ekanthappa, R. Escobar, A. Matevossian, D. Akopian, \u201cA remote laboratory for USRP-based software defined radio,\u201d SPIE EI Mobile Devices and Multimedia: Enabling Technologies, Algorithms, and Applications 2014, Feb 3-5, 2014, San Francisco, CA.<\/li>\n
          12. J. Morales, D. Akopian, S. Agaian, \u201cDealing with Faulty Measurements in WLAN Indoor Positioning\u201d, SPIE EI Mobile Devices and Multimedia: Enabling Technologies, Algorithms, and Applications 2014, Feb 3-5, 2014, San Francisco, CA. pp.90300P1-10.<\/li>\n
          13. J. Morales, D. Akopian, S. Agaian, \u201cHuman Activity Recognition by Smartphones Regardless of Device Orientation\u201d, SPIE EI Mobile Devices and Multimedia: Enabling Technologies, Algorithms, and Applications 2014, Feb 3-5, 2014, San Francisco, CA. 90300I1-12<\/li>\n
          14. A. Saha, D. Akopian, \u201cIndoor positioning system using WLAN multipath signals as fingerprints for mobile devices,\u201d SPIE EI Mobile Devices and Multimedia: Enabling Technologies, Algorithms, and Applications 2014, Feb 3-5, 2014, San Francisco, CA, 90300H1-7<\/li>\n
          15. A. Mayers, B. Kone, GVS Raju, D. Akopian, \u201cAn adaptive stochastic-based M-ary modulation extension algorithm for short range wireless CRs,\u201d IEEE Eireless Telecommunications Symposium (WTS), Apr 17-19, Phoenix, AZ.<\/li>\n
          16. A. Mayers, P. Benavidez, GVS Raju, D. Akopian, M. Jamshidi, \u201cA novel BER-feedback power control algorithm for PAN devices,\u201d IEEE Int. Systems Conference (SysCon), Apr 15-18, 2013, Orlando, FL, pp.370-375.<\/li>\n
          17. S. Kaghyan, H. Sarukhanyan, D. Akopian, Human movement activity classification approaches that use wearable sensors and mobile devices, Proc. SPIE 8667, Multimedia Content and Mobile Devices, 86670O (March 7, 2013); doi:10.1117\/12.2007868<\/li>\n
          18. R. D. Escobar, D. Akopian, D. Parra-Medina, L. Esparza, \u201cMessageSpace: a messaging system for health research\u201d, Proc. SPIE 8667, Multimedia Content and Mobile Devices, 86670V (March 7, 2013); doi:10.1117\/12.2007530<\/li>\n
          19. A. Soghoyan, D. Kinjarapu, D. Akopian, \u201cFast Prototyping of Receiver Accelerators Using NI Labview FPGA,\u201d ION GNSS 2013, Sep. 16-20, Nashville, TN, 2013, pp.1577-1526<\/li>\n
          20. G. Huang, D. Akopian, A-GPS Assistance Network Delay Modeling and Estimation Over Mobile Networks: ION GNSS 2013, Sep. 16-20, Nashville, TN, 2013<\/li>\n
          21. S. C. Golagani, M. Esfahanian, D. Akopian, Template\u2013Based Image Processing Toolkit for Mobile Platforms, SPIE Electronic Imaging: Multimedia on Mobile Devices Conference, San Francisco, CA, Jan 24-25, 2012, pp. 83040O1-11.<\/li>\n
          22. J. Narisetty, A. Soghoyan, M. Sundaramurthy, D. Akopian, \u201cSUPL Support for Mobile Devices\u201d SPIE Electronic Imaging: Multimedia on Mobile Devices Conference, San Francisco, CA, Jan 24-25, 2012, pp 830409:1-12<\/li>\n
          23. C. Saygin, T. Yuen, H. Shipley, H., H. Wan, and D. Akopian, XYZ* Center for K-12 STEM education: from summer camps to robotics competitions, ASEE Annual Conference, San Antonio, TX, AC2012-3021, 2012<\/li>\n
          24. G. Huang, A. Melkonyan, M. Pontual, A. Gampe, David Akopian, Remote experimentation for communications: from remote desktops to gateways\u201d, ASEE Annual Conference, San Antonio, TX, AC2012-3303, 2012<\/li>\n
          25. B. Chandana, M. Esfahanian, D. Akopian, C. Saygin, \u201cTemplate\u2013based image processing toolkit for Android phones\u201d, ASEE Annual Conference, San Antonio, TX, AC2012-3546, 2012<\/li>\n
          26. D. Akopian, A. Melkonyan, S. Yalamachili, and P. Chen, \u201cIntegrated Monitoring and Mobile Implementation Aspect of WLAN Positioning\u201d , in Proc. of ICSSE 2011, Macau, China, June 2011, pp. 688-693<\/li>\n
          27. A. Melkonyan, S. Yalamachili, D. Akopian, and P. Chen, \u201cIntegrated Monitoring and Thresholding-Based WLAN Indoor Positioning Algorithm for Mobile Devices\u201d , in Proc. of SoSE 2011, Albuquerque NM, USA, 2011, pp.191-196<\/li>\n
          28. A. Melkonyan, M. Pontual, G. Huang, A. Gampe, D. Akopian \u201ceComLab: Remote Laboratory Architecture of Radio-Communications,\u201d 11th ASEE-GSW Conference-Innovating Engineering and Engineering Technology Education, March 9-11, 2011, F2A-1, Houston, TX.<\/li>\n
          29. A. Kumar, M. Esfahanian, A. Melkonyan, D. Akopian, \u201cTemplate-based education in mobile application development,\u201d 11th ASEE-GSW Conference-Innovating Engineering and Engineering Technology Education, March 9-11, 2011, T3B-4, Houston, TX.<\/li>\n
          30. M. Pontual, A. Melkonyan, A. Gampe, G. Huang, D. Akopian, \u201ceComLab: remote laboratory platform,\u201d SPIE Mobile Multimedia\/Image Processing, Security, and Applications, vol. 8063, Apr. 25-29, 2011, Orlando, FL., 806311:1-10<\/li>\n
          31. G. Ramachandran, D. Akopian, G.W. Heckler, L. B. Winternitz, \u201cPerformance evaluation of block acquisition and tracking algorithms using an open source GPS receiver platform,\u201d Institute of Navigation, 2011 ITM Conference, Jan 24-26, 2011, San Diego, CA, pp.759-766.<\/li>\n
          32. D. Akopian, A. Soghoyan, S.N. Chayapathi, \u201cA feasibility study of a Labview-based GNSS receiver,\u201d Institute of Navigation, 2011 ITM Conference, Jan 24-26, 2011, San Diego, CA, pp.1270-1280.<\/li>\n
          33. A. Soghoyan, G. Huang, J. Narisetty, D. Akopian, \u201cA Labview-Based Assisted GPS Receiver Development, Simulation and Testing Platform,\u201d ION GNSS 2011 Conference, Portland, OR, Sep 20-23, 2011, pp.1982-1994<\/li>\n
          34. A. Suleiman, D. Kinjarapu, D. Akopian, F. Hudson, \u201cReconfigurable correlator accelerators for software GPS receivers,\u201d ION GNSS 2011 Conference, Sep. 20-23, 2011, Portland, OR, pp. 3720-3728<\/li>\n
          35. M. C. Sundaramurthy, S.. N. Chayapathi, A. Kumar, D. Akopian, \u201cWi-Fi assistance to SUPL-based Assisted-GPS simulators for indoor positioning,\u201d Proceedings of IEEE Consumer and Networking Conference, Jan 9-12, 2011, Las Vegas, NV, pp 918-922,<\/li>\n
          36. S. Sathyanarayana, D. Akopian, S. Agaian, \u201cAn adaptive LMS technique for wavelet polynomial threshold denoising,\u201d SPIE Mobile Multimedia\/Image Processing, Security, and Applications, vol. 8063, Apr. 25-29, 2011, Orlando, FL., pp. 806308:1-10<\/li>\n
          37. M. Chan, S. Sathyanarayana, D. Akopian, S. Agaian, \u201cApplication of wavelet polynomial threshold for interpolation and denoising in bioimaging,\u201d SPIE Mobile Multimedia\/Image Processing, Security, and Applications, vol. 8063, Apr. 25-29, 2011, Orlando, FL, pp. 80630Z1-12<\/li>\n
          38. M. Chan, S. Sathyanarayana, D. Akopian, S. Agaian, \u201cMultiple user access and testing for PreNotiS: a fast mobile event reporting solution,\u201d SPIE Mobile Multimedia\/Image Processing, Security, and Applications, vol. 8063, Apr. 25-29, 2011, Orlando, FL, pp. 80630Y1-8.<\/li>\n
          39. B. Kalgikar, D. Akopian, P. Chen, \u201cA signal strength priority based position estimation for mobile platforms,\u201d Multimedia on Mobile Devices, Proc. SPIE, vol. 7542, 2010, pp. 75420F1-10<\/li>\n
          40. A. Hussein, A. Suleiman, N. Kerkiz, D. Akopian, \u201cScalable interconnect networks for Discrete Cosine Transforms (DCT) for mobile multimedia applications,\u201d 53rd IEEE Int. Midwest Symposium in Circuits and Systems (MWSCAS), Aug 1-4, 2010, pp.741-744.<\/li>\n
          41. N. Kerkiz, A. Hussein, A. Elchouemi, A. Suleiman, \u201cDesign method for scalable discrete trigonometric transforms (DTT) with constant geometry,\u201d 53rd IEEE Int. Midwest Symposium in Circuits and Systems (MWSCAS), Aug 1-4, 2010, pp.745-748.<\/li>\n
          42. A. Melkonyan, D. Akopian, C.L.P. Chen, “A sensor placement measure for impact detection in structural health monitoring” IEEE International Conference on Systems, Man and Cybernetics, 2009. SMC 2009, 11-14 Oct. 2009, pp. 3775 \u2013 3778<\/li>\n
          43. A. Melkonyan, D. Akopian, C.L.P. Chen, “A remote over-internet hands-on laboratory” IEEE International Conference on Systems, Man and Cybernetics, 2009. SMC 2009, 11-14 Oct. 2009, pp. 4634\u2013 4640<\/li>\n
          44. G. Huang, A. Soghoyan, D. Akopian, C.L.P. Chen, S. Abhay, “A land mobile channel modeling in LabVIEW,” IEEE International Conference on Systems, Man and Cybernetics (SMC), Oct. 11-14, 2009, San Antonio, TX, pp. 4575 \u2013 4580<\/li>\n
          45. A. Melkonyan, D. Akopian, C.L.P. Chen, “Work in progress – real-time remote Internet-based communication laboratory,” 39th IEEE Frontiers in Education Conference, 2009. FIE ’09, 18-21 Oct. 2009<\/li>\n
          46. S.N. Chayapathy, A. Kumar, P. Kashyap, D. Akopian, A. Samant, “A SUPL-based A-GPS Simulator Support for Indoor Positioning,” Proceedings of ION GNSS Conference, Sep 22-25, 2009, Savannah,GA, pp.503-515.<\/li>\n
          47. A. Hussein, A. Suleiman, ,\u201dImplementation of scalable interconnect networks for data reordering used in Discrete Trigonometric Transforms (DTT),\u201d IEEE ICICDT\u20192009 Int. Conference, May 18-20, 2009, pp. 139-142.<\/li>\n
          48. A. Kumar, D. Akopian, P. Chen, \u201cPerformance study of a mobile preventive notification system (PreNotiS),\u201d SPIE Electronic Imaging\/Multimedia on Mobile Devices Conference, San Jose, CA, Jan 2009, pp. 72560F1-12<\/li>\n
          49. P. Kashyap, D. Akopian, A. Samant, \u201cAn assisted GPS messaging for GPS simulators for embedded mobile positioning\u201d, SPIE Electronic Imaging\/Multimedia on Mobile Devices Conference, San Jose, CA, Jan 2009. pp. 72560G1-12.<\/li>\n
          50. A. Kumar, D. Akopian, P. Chen, \u201cA dynamic client\/server message-exchange application for mobile phones\u201d, SPIE Electronic Imaging\/Multimedia on Mobile Devices Conference, San Jose, CA, Jan 2009.<\/li>\n
          51. S. Yerubandi, M. Gunturu, A. Melkonyan, D. Akopian, P. Chen, \u201cIntegrity Monitoring In WLAN Positioning Systems\u201d, SPIE Defence and Security Conference, Orlando, FL, Apr. 2009, pp. 735109:1-12<\/li>\n
          52. C. Lacatus, D. Akopian, M. Shadaram, \u201cAdaptive OFDMA Scheme for spectrum and power allocation\u201d, World Automation Congress, Sep. 2008.<\/li>\n
          53. A. Panchul, D. Akopian, P. Chen, \u201cMobile Event Reporting for Symbian platforms\u201d, World Automation Congress, Sep. 2008.<\/li>\n
          54. P.K. Sagiraju, P. Kashyap, D. Akopian, \u201cBlock Correlator for Tracking GNSS Signals,\u201d ION GNSS 2008 Conference, Savannah, Georgia, Sep. 16-19, 2008.<\/li>\n
          55. A. Panchul, D. Akopian, “Educational Applications Development for Smartphones,” ASEE Annual Conference, June 2008, Pittsburgh, PA.<\/li>\n
          56. C. Lacatus, D. Akopian, M. Shadaram, \u201cImplementation Approaches of Adaptive Algorithms for Crosscorrelation Effect Compensation in Weak Signal Conditions,\u201d Proceedings of IEEE PLANS 2008 Conference, Monterey, CA, May 5-8, 2008.<\/li>\n
          57. D. Akopian, P. Chen, M. Gunturu, P. Sagiraju, \u201cImplementation of an intrusion detection system based on wireless positioning\u201d, Proceeding of SPIE, Vol. 6982, pp. 698205-698205-11. Mobile Multimedia\/Image Processing, Security, and Applications, March 2008, Orlando, FL.<\/li>\n
          58. D. Akopian, P. Chen, S. Miryakar, A. Kumar, \u201cPreNotiS: Massive Preventive Notification System,\u201d Proceeding of SPIE, Vol. 6982, pp. 69820Y-69820Y-8. Mobile Multimedia\/Image Processing, Security, and Applications, March 2008, Orlando, FL.<\/li>\n
          59. K. Naghdali, S. Dursun, D. Akopian, “Non-uniform pulse quantization for mutiplication-free correlation in ultra wideband receivers,” Proceeding of SPIE, Vol. 6980, pp. 698009-698009-7. Wireless Sensing and Processing III, March 2008, Orlando, FL.<\/li>\n
          60. C. Lacatus, D. Akopian, M. Shadaram, \u201cFast convergence of distributed joint spreading sequence and power control algorithms,\u201d 2008 IEEE Radio and Wireless Symposium, RWS, 22-24 Jan 2008, Orlando, FL.<\/li>\n
          61. D. Akopian, P. Ybarra, P. Chen, \u201cOptimization of time-varying two-band filterbanks for wavelet transforms,\u201d Proceedings of IEEE SoSE 2007 Conference, April 16-18, 2007, San Antonio, TX.<\/li>\n
          62. K. Naghdali, S. Dursun, D. Akopian, “Non-uniform pulse quantization for mutiplication-free correlation in ultra wideband receivers,” UTSA 2007 ESB Student Conference, Accepted to SPIE Defence and Security Conference, March 2008, Orlando, FL.<\/li>\n
          63. A. Melkonyan, D. Akopian, P. Chen, “Impact Localization for Structural Health Monitoring,” UTSA 2007 ESB Student Conference, Nov 9, 2007.<\/li>\n
          64. A. Panchul, D. Akopian, “Educational Applications Development for Smartphones,” UTSA 2007 ESB Student Conference, Nov 9, 2007, abstract accepted to 2008 ASEE Annual Conference, June 2008, Pittsburgh, PA<\/li>\n
          65. H. Nguyen, T. Nguyen, R. Trevino, E. Teran-Delgado, A. Panchul, D. Akopian, “A case study of context-driven aspplication as an example of educational project on cell phone platforms,” UTSA 2007 ESB Student Conference, Nov 9, 2007.<\/li>\n
          66. \u00a0Phani K. Sagiraju, Praveen Gali, David Akopian, G.V.S. Raju, “Enhancing Security in Wireless Networks Using Positioning Techniques,” Proceedings of IEEE SoSE 2007 Conference, San Antonio, TX, April 16 -18, 2007.<\/li>\n
          67. Phani K. Sagiraju, Aleksandr Panchul, David Akopian, “A Software GPS+ Receiver Toolkit ” Proceedings of IEEE SoSE 2007 Conference, San Antonio, TX, April 16 -18, 2007.<\/li>\n
          68. Phani K. Sagiraju, David Akopian, “Performance Study of Reduced Search FFT-Based Acquisition” Proceedings of ION National Technical Meeting, San Diego, California, January 22-24, 2007.<\/li>\n
          69. C. Lacatus, D. Akopian, M. Shadaram, \u201cFast convergence of distributed joint spreading sequence and power control algorithms,\u201d 2008 IEEE Radio and Wireless Symposium, RWS, 22-24 Jan 2008, Orlando, FL.<\/li>\n
          70. C. Lacatus, D. Akopian, M. Shadaram, \u201cAn adaptive approach to compensate crosscorrelation effects in weak signal conditions for satellite positioning systems,\u201d ION GNSS Conference, 26-28 Sep 2007, Fort Worth, TX.<\/li>\n
          71. C. Lacatus, D. Akopian, M. Shadaram, \u201cSpectrum assignment for flexible rate cognitive OFDM Systems,\u201d 2007 IEEE MILCOM Conference, 29-31 Oct 2007, Orlando, FL<\/li>\n
          72. C. Lacatus, D. Akopian, M. Shadaram, \u201cSpreading sequence design for MC-CDMA systems,\u201d IEEE International Conference on System of Systems Engineering, SoSE 2007, April 15-18, 2007, San Antonio, TX<\/li>\n
          73. D. Bhupathiraju, D. Akopian, \u201cAutomatic Sorting and Storage Based on Location Information\u201d ION NTM 2007, January2007.<\/li>\n
          74. P. Sagiraju, H. Valio, D. Akopian,”Fine Frequency Estimation in Weak Signals for GPS Receivers” ION NTM 2006, January 18, Monterey, CA.<\/li>\n
          75. P. Sagiraju, D. Akopian, \u201cPerformance of Two-Stage Massive Correlator Architecture for Fast Acquisition of GPS Signals” IEEE Region 5 Conference, April 2006, San Antonio, TX.<\/li>\n
          76. A. Panchul, D. Akopian, \u201cOn porting computer applications into Symbian cell phone platform\u201d, IEEE Region 5 Conference, April 2006, San Antonio, TX.<\/li>\n
          77. A. Panchul, D. Bhupathiraju, S. Agaian, D. Akopian, \u201cAn imaging toolbox for smart phone applications\u201d, Mobile Multimedia\/Image Processing for Military and Security Applications, SPIE Defense and Security Symposium Symposium, 17-21 April 2006, Orlando, FL<\/li>\n
          78. P. Sagiraju, D. Bhupathiraju, GVS Raju, D. Akopian, \u201cSoftware GPS receiver test-bed development at UTSA\u201d IEEE PLANS 2006.<\/li>\n
          79. D. Bhupathiraju, P. Sagiraju, D. Akopian, \u201cAn automatic digital album,\u201d IEEE WTS Conference, April 28-29, 2006, Pomona, CA.<\/li>\n
          80. D. Akopian, S. Agaian, H. Valio, \u201cFast time-recursive matched filters for DSSS communications,\u201d US Institute of Navigation, ION NTM 2006 Conference, January 2006.<\/li>\n
          81. S. Agaian, D. Akopian and S. D\u2019Souza “Wireless Steganography” SPIE Electronic imaging Conference, January 2006.<\/li>\n
          82. D. Akopian and S. Agaian, \u201cA Fast position recovery approach for GPS receivers in jamming environments and a recommendation for future GPS signal structure,\u201d IEEE MILCOM Conference, Atlantic City, Oct. 17-21, 2005.<\/li>\n
          83. Phani K. Sagiraju, David Akopian and David Magee \u201cA Fast Acquisition Algorithm for Indoor Receivers\u201d, US Institute of Navigation (ION), 61st Annual Meeting, June 2005.<\/li>\n
          84. D. Akopian, Phani K. Sagiraju, S. Agaian, G.V.S. Raju, “A Reduced complexity frequency domain acquisition of DS-SS Signals for embedded applications,” IS&T\/SPIE’s Symposium on Electronic Imaging: Science & Technology, Jan. 2005.<\/li>\n
          85. D. Akopian, S. Agaian, Fast and Parallel matched filters in time domain,” US Institute of Navigation, GNSS’ 2004 Conference, September 21-24, 2004, Long Beach, CA, USA<\/li>\n
          86. D. Akopian, S. Agaian, “A fast algorithm for long FIR filters with small coefficient alphabet”, The 2004 Int. Workshop on Spectral Methods and Multirate Signal Processing, SMMSP2004, September 11-12, 2004, Vienna, Austria.<\/li>\n
          87. C.B. Smith, D. Akopian, S. Agaian, ” Least squares optimization of a polynomial threshold for wavelet domain denoising”, Proceedings of ICSP\u201904 7th Internatiuonal Conference on Signal Processing, 31 Aug.-4 Sept. 2004, Vol. 1, pp. 109-112.<\/li>\n
          88. D. Akopian, S. Agaian, “Fast matched filter in time domain”, IEEE Position Location and Navigation Symposium 2004, April 26-29, Monterey, CA, 2004, pp. 455-460<\/li>\n
          89. D. Akopian, J. Takala, S. Agaian, “Scalable transform accelerator for multimedia communications”, SPIE Electronic Imaging\/ Embedded Processors for Multimedia and Communications Conference, January 2004, SPIE Vol. 5309, pp. 70 – 79.<\/li>\n
          90. D. Akopian, J. Syrj\u00e4rinne, “A Network aided iterated LS method for GPS positioning and time recovery without navigation message,” Proceedings of IEEE PLANS’2002 Conference, April 15-18, 2002, Palm Springs, CA, USA, pp. 77-83.<\/li>\n
          91. D. Akopian, H. Valio, S. Turunen, “Fine acquisition methods for GPS receivers,” ION GPS’ 2002 Conference, US Institute of Navigation, September 24-27, 2002, Portland, Oregon, USA.<\/li>\n
          92. D. Akopian, “Backpropagation optimization algorithm for families of linear-phase filterbanks and block transforms”, Proceedings of CSIT’ 2001 Conference, Yerevan, Armenia, Sept. 17-20, 2001<\/li>\n
          93. D. Akopian, “An optimization approach for two-band periodically time-varying perfect reconstruction filterbanks”, Proceedings of CSIT’2001 Conference, Yerevan, Armenia, Sept. 17-20, 2001.<\/li>\n
          94. D. Akopian, “A fast satellite acquisition method”, USA Institute of Navigation, ION-GPS’2001Conference, Salt Lake City, USA, Sept. 11-14, 2001.<\/li>\n
          95. D. Akopian, J. Parkkinen, T. J\u00e4\u00e4skel\u00e4inen, and J. Astola: Multibase Transform Coding for Multispectral Image Compression. In Proceedings of Algorithms for Multispectral, Hyperspectral, and Ultraspectral Imagery VI, SPIE vol. 4049, Orlando, USA, April 24-26, 2000, pp. 511-520.<\/li>\n
          96. J. Nikara, J. Takala, D. Akopian, J. Saarinen, J. Astola, “Pipelined architecture for inverse Discrete Cosine Transform,” Proceedings of EUSIPCO’2000 Conference, Tampere, Finland<\/li>\n
          97. K. Balashov, D. Akopian, J. Astola, “Lossless Compression of Natural Images Using Regressive Analysis,” Proceedings of EUSIPCO’2000 Conference, Tampere, Finland<\/li>\n
          98. J. Takala, J. Nikara, D. Akopian, J. Astola, and J. Saarinen, “Pipeline Architecture for 2-D 8×8 Discrete Cosine Transform,” in Proc. IEEE Int.Conf. on Acoustics, Speech and Signal Process., Istanbul, Turkey, June 5-9, 2000, vol. VI, pp. 3303-3306.<\/li>\n
          99. J. Takala, D. Akopian, J. Astola, and J. Saarinen, “Scalable Interconnection Networks for Partial Column Array Processor Architectures,” in Proc. IEEE Int. Symp. on Circuits and Systems, Geneva, Switzerland, May 28 – 31 2000, vol. IV, pp. 513-516.<\/li>\n
          100. J. Takala, T.S. Jarvinen, P.V. Salmela, D. Akopian, \u201cMulti-port interconnection networks for radix-R algorithms\u201d. Proceedings of IEEE International Conference on Acoustics, Speech, and Signal Processing, 2001 (ICASSP ’01). Volume 2, 7-11 May 2001 Page(s):1177 – 1180 vol.2<\/li>\n
          101. \u00a0\u00a0J. Nikara, J. Takala, D. Akopian, and J. Saarinen, “Pipeline Architecture for DCT\/IDCT” in Proc. of 2001 IEEE International Symposium on Circuits and Systems, 2001. ISCAS 2001. Volume 4, 6-9 May 2001, pp. 902 \u2013 905.<\/li>\n
          102. \u00a0\u00a0 D. Akopian and J. Astola, “An optimal bit-allocation technique for multibase transforms,” Proceedings of FINSIG’99 Conference, 1999, Oulu, Finland<\/li>\n
          103. \u00a0 . Tunyan, J. Astola, D. Akopian, A. Tuniev, “Development of A-orthogonalization process and its possible applications,” Proceedings of the Conference, Computer Science and Information Technologies (CSIT’99), Yerevan, Armenia, pp. 321-324, 1999.<\/li>\n
          104. \u00a0\u00a0 D. Akopian and J. Astola, “Multibase transform with prediction for still image compression,” Proceedings of the Conference, Computer Science and Information Technologies (CSIT’99) Yerevan, Armenia, 1999.<\/li>\n
          105. \u00a0\u00a0 D. Akopian, M. Helsingius, J. Astola, “An Optimized Multiscanning Approach for Still Image Compression,” 1999 IEEE International Workshop on Multimedia Signal Processing (MMSP’99), September 13-15, 1999, Copenhagen, Denmark<\/li>\n
          106. \u00a0\u00a0 D. Akopian, J. Takala, J. Astola, J. Saarinen, “Multistage interconnection networks for k\/n rate Viterbi decoders,” IEEE GLOBECOM’98 Conference, Nov., Australia, 1998.<\/li>\n
          107. \u00a0\u00a0 D. Akopian, M. Helsingius, J. Astola, “A Combined multibase\/wavelet transform coding of still images,” Proceedings of IEEE ISPACS’98 Conference, 1998.<\/li>\n
          108. \u00a0\u00a0 D. Akopian and J. Astola, “Fast architecture oriented algorithms for trigonometric transforms and their mapping to scalable structures,” Proceedings of First International Workshop on Transforms and Filterbanks, TICSP Series-1, June 1998, pp. 433-471.<\/li>\n
          109. \u00a0\u00a0 D. Akopian, M. Helsingius, J. Astola, “Multibase\/Wavelet transform coding without blocking artifacts,” Proceedings of 32nd Asilomar Conference on Signals, Systems, and Computers, November 1-4, 1998, Pacific Grove, CA, USA.<\/li>\n
          110. \u00a0 D. Akopian, J. Takala, J. Astola, J. Saarinen, “A Multistage interconnection network for parallel Viterbi decoders,” Proceedings of IEEE ISPACS’97 Conference, 11-13 Nov., Malaysia, pp. S16.6.1-S16.6.5, and FINSIG’97 Conference, May 22, Pori, Finland, 1997.<\/li>\n
          111. \u00a0\u00a0 D. Akopian and J. Astola, “An optimal nonlinear extension of linear filters,” Proc. of CSIT’97 Conference, 26-29 Sept., 1997, Yerevan, Armenia, pp. 141-144.<\/li>\n
          112. \u00a0\u00a0 D. Akopian and J. Astola, “An optimal extension of linear filters based on distributed arithmetic,” Proc. of SPIE Statistical and Stochastic Methods in Image Processing II Conference, 27 July-1 August, 1997, San Diego, CA.<\/li>\n
          113. \u00a0\u00a0 J. Astola and D. Akopian, “Fast regular 2-D algorithms for a class of trigonometric transforms,” Proc. of IS\\&T\/SPIE’s Symp. on Electronic Imaging, Sc. and Technology, Visual Com. and Image Proc., February, 1997.<\/li>\n
          114. \u00a0\u00a0 O. Vainio, D. Akopian, J. Astola, “A Synthesizable stack filter ASIC macro,” Proc. of IEEE Int. NORCHIP’96 Conference, pp. 172-178, November 1996.<\/li>\n
          115. \u00a0\u00a0 M. Helsingius, S. Atourian, D. Akopian and J. Astola, “Multibase transform coding of images,” Proc. of IEEE Int. NORSIG’96 Conference, pp. 255-258, September 1996.<\/li>\n
          116. \u00a0\u00a0 D. Akopian and J. Astola,”Processor architecture for Extended Lapped Transform,” Proc. of EUSIPCO’96 Conference, pp. 1459-1462, 1996.<\/li>\n
          117. \u00a0\u00a0 I. Dhaou, D. Akopian, P. Kuosmanen and J. Astola, “Fault detection in stack filters based on sample selection probabilities,” Proc. of IEEE Int. Conf. on Image Processing, pp. 765-768, 1996.<\/li>\n
          118. \u00a0 D. Akopian and J. Astola, “Pipeline processor for fast architecture oriented regular DCT-IDCT algorithm,” Proc. of IEEE Int. Conf. on Acoust. Speech and Sign. Processing, pp.1319-1322, May 1996, Atlanta, USA.<\/li>\n
          119. \u00a0\u00a0 J. Astola and D. Akopian, “Architecture oriented regular algorithms for discrete sine and cosine transforms,” Proc. of IS\\&T\/SPIE’s Symp. on Electronic Imaging, Sc. and Technology, pp. 9-20, 28 Jan.-2 Feb., 1996<\/li>\n
          120. \u00a0\u00a0 J. Astola, P. Kuosmanen, D. Akopian, D. Gevorkian, “Fibonacci P-Code method for generalized stack filtering,” Proc. of IEEE Int. Symp. on Circuits and Systems, pp. 1900-1903, 1995.<\/li>\n
          121. \u00a0\u00a0 Jaakko Astola, David Akopian, and Karen Egiazarian, “New processor architecture for running threshold Boolean filters,” Proc. of SPIE Meeting on Visual Communications and Image Processing’95, pp. 366-377, Taiwan, May 1995.<\/li>\n
          122. \u00a0\u00a0 Karen Egiazarian, David Akopian, and David Gevorkian, “Threshold Boolean filtering based on pattern classification,” Proc. of IEEE Workshop on Nonlinear Signal and Image Processing, pp. 879-882, June 1995, Greece.<\/li>\n
          123. \u00a0\u00a0 O. Vainio, D. Akopian, J. Astola, “Systematic design of encoder and decoder networks with applications to high-speed signal processing,” Proc. of IEEE Int. Symp. on Industrial Electronics, Athens, Greece, July 1995, pp. 172-175.<\/li>\n
          124. \u00a0\u00a0 J. Astola, D. Akopian, S. Agaian, O. Vainio, “A Unified approach to implementation of stack filters,” Proc. Of Twenty-Eight Asilomar Conf. on Signals, Systems and Computers, Nov. 1-3, pp. 329-334, 1994, Pacific Grove, California.<\/li>\n
          125. \u00a0\u00a0 D. Akopian, O. Vainio, S. Agaian, and J. Astola, “SBNR processor for stack filters,” Proc. of Twenty-Eight Asil. Conf. on Signals, Systems and Computers, pp. 335-339, Nov. 1-3, 1994.<\/li>\n
          126. \u00a0\u00a0 D. Akopian, K. Egiazarian, S. Agaian, J. Astola, “Pipeline processors for fast trigonometric transforms,” Proc. of Twenty-Eight Asilomar Conf. on Signals, Systems and Computers, pp. 1031-1035, Nov. 1-3, 1994, Pacific Grove, California.<\/li>\n
          127. \u00a0\u00a0 S. Agaian and D. Akopian, “Fibonacci processors for digital signals transform,” Proc. of First USSR Conf. on Pattern Recognition and Image Analyses: New informative technologies (ROAI-1-91), Part III, Section 3, pp. 13-15, Minsk (USSR), October 14-18, 1991.<\/li>\n
          128. \u00a0\u00a0 D. Akopian and J. Astola, “Pipeline processor for DCT-IDCT algorithm,” Proc. of FINSIG’95 Conf., 1995.<\/li>\n
          129. \u00a0\u00a0 D. Akopian, O. Vainio, J. Astola, “Parallel multi-threshold circuit and stacked signals adder,” Proceedings of the First TUT Symposium on Signal Processing, pp. 23-26, May 20, 1994.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

            Patents A. Khalajmehrabadi, N. Gatsis, D. Akopian, \u201cSystems and Methods for Wireless Local Area Network Localization,\u201d Patent application 62\/408,665, 10.14.2016 D. Akopian, R. Escobar, S. Kaghyan, \u201cInteractive Mobile Service for Deploying Automated Protocols,\u201d US Patent application 62\/376,445, 08.18.2016 D. Akopian, CJ Qian, D. Park, \u201cSystems and Methods for a Mobile UAV-Based Emergency Communications Scanner,\u201d Patent … <\/p>\n

            Continue reading “Publications”<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":87,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-14","page","type-page","status-publish","has-post-thumbnail","hentry"],"yoast_head":"\nPublications - David Akopian<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ceid.utsa.edu\/dakopian\/publications\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Publications - David Akopian\" \/>\n<meta property=\"og:description\" content=\"Patents A. Khalajmehrabadi, N. Gatsis, D. 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