Research

Energy-Efficient Mobile Touch Architecture

Adaptive Touch Concept Faster touch responsiveness in computer user interface provides better experience to users. Faster responsiveness can be achieved by higher operating frequency in touch system. However, it requires higher power consumption. This research looks for solutions to improve touch responsiveness while keeping low-power consumption when it is needed. Related Publications: [SysCon'15]
    Papers
  • A. W. Min, K. Han, D. Hong, Y. Park,``Adaptive Touch Sampling for Energy-Efficient Mobile Platforms," Proc. IEEE International Systems Conference, April 13-16, 2015, pp. 754-757, Vancouver, Canada. [pdf] [Slide]
    Patents
  1. Kyungtae Han, Dongho Hong, Alexander W. Min, Yong-joon Park, and Mohamed A. Abdelmoneum, ADAPTIVE TOUCH SCANNING, filed 2013, US patent pending. [pdf]
  2. Kyungtae Han, Paul Diefenbaugh, and Sarah Sharp, POLLING DETERMINATION, filed Sept. 28, 2013, US patent pending. [pdf]

Low-Power Mobile Computer Display Architecture

Low Power Display Subsystem
Display subsystem is one of the dominant power hungry components in mobile computing systems. In order to extend the battery life in mobile systems, optimizing the display subsystem is the critical. This research analyzes power saving opportunity in display subsystem and validates the solution of new architecture. Related Publications: [ISLPED'13] [SID'11] [ICCD'09]
    Papers
  1. K. Han, A. W. Min, N. S. Jeganathan, and P. Diefenbaugh, ``A Hybrid Display Frame Buffer Architecture for Energy Efficient Display Subsystems," International Symposium on Low Power Electronics and Design, Sept. 4-6, 2013, pp. 347-352, Beijing, China. [pdf]
  2. K. Han, N. S. Jeganathan, and P. Diefenbaugh, ``Parametric Evaluation of Computer Displays for Optimized Display Data Transmission,'' Society for Information Display Symposium Digest, pp. 1444-1447, May 2011. [pdf]
  3. K. Han, Z. Fang, P. Diefenbaugh, R. Forand, R. Iyer, and D. Newell, ``Using Checksum to Reduce Power Consumption of Display Systems for Low-Motion Content,'' Proc. IEEE International Conference on Computer Design, Oct. 4-7, 2009, pp. 47-53, Lake Tahoe, CA USA. [pdf]
    Patents
  1. Nithyananda Jeganathan, Kyungtae Han, and Paul Diefenbaugh, DATA TRANSMISSION FOR DISPLAY PARTIAL UPDATE, filed Mar. 15, 2013, US patent pending. [pdf]
  2. Nithyananda Jeganathan, Rajesh Poornachandran, Paul Diefenbaugh, and Kyungtae Han, TECHNIQUES FOR MANAGING SYSTEM POWER USING DEFERRED GRAPHICS RENDERING, filed Jan. 15, 2013, US patent pending. [pdf]
  3. Kyungtae Han, Paul Diefenbaugh, Sameer Abhinkar, Taemin Kim, Siva Jeganathan, HETEROGENEOUS FRAME BUFFER IN DISPLAY SUBSYSTEM, filed Nov. 9, 2012, US patent pending. [pdf]
  4. Siva Jeganathan, Paul Diefenbaugh, Kyungtae Han, Jinjun Liu, James A. Bish, Paul C. Drews, CONTROL OF PLATFORM POWER CONSUMPTION USING COORDINATION OF PLATFORM POWER MANAGEMENT AND DISPLAY POWER MANAGEMENT, filed Apr. 1, 2011, issued Oct. 14, 2014, US patent 8862906 B2. [pdf]
  5. Maximino Vasquez, Ravi Ranganathan, Seh Kwa, Todd M. Witter, Kyungtae Han, and Paul S. Diefenbaugh, TECHNIQUES FOR ALIGNING FRAME DATA, filed Dec. 30, 2009, issued Feb. 4, 2014, US patent 8643658. [pdf]
  6. Kyungtae Han, Zhen Fang, USING MOTION CHANGE DETECTION TO REDUCE POWER CONSUMPTION OF DISPLAY SYSTEMS, filed Sep. 28, 2009, 20110078536, US patent pending. [pdf]
  7. Kyungtae Han, Guoqing C. Li and Sumit K. Singh, DISPLAY UPDATE FOR A WIRELESS DISPLAY DEVICE, filed Jun. 23, 2009, issued Sept. 9, 2013, US patent 8525844. [pdf]

Automated Computer-Aided Design Technology

CAD search As the complexity of computer is getting increased, it is getting harder to meet the requirement of time-to-market. This research focuses on automation tool to reduce design time. The result of the research provides dramatical reduction in one of the design process of floating-point to fixed-point conversion for low-power and low-cost design. Related Publications: [Asilomar'06] [EURASIP'06] [ICASSP'04] [ISCAS'01] [CIC'00]
    Papers
  1. K. Han, A. G. Olson, and B. L. Evans, ``Automatic Floating-Point to Fixed-Point Transformations,'' Proc. IEEE Asilomar Conf. on Signals, Systems, and Computers, Oct. 29-Nov. 1, 2006, Pacific Grove, CA USA, invited paper. [pdf]
  2. K. Han and B. L. Evans ``Optimum Wordlength Search Using Sensitivity Information,'' EURASIP Journal on Applied Signal Processing, special issue on Design Methods for DSP Systems, vol. 2006, special issue no. 5, 14 pages, Article Id 928429, Mar. 2006. [pdf]
  3. K. Han and B. L. Evans, ``Wordlength Optimization with Complexity-And-Distortion Measure and Its Applications to Broadband Wireless Demodulator Design,'' Proc. IEEE Int. Conf. on Acoustics, Speech, and Signal Proc., May 17-21, 2004, vol. 5, pp. 37-40, Montreal, Canada. [pdf]
  4. K. Han, I. Eo, K. Kim, and H. Cho, ``Numerical Word-Length Optimization for CDMA Demodulator,'' Proc. IEEE International Symposium on Circuits and Systems, May, 2001, vol. 4, pp. 290-293, Sydney, Australia. [pdf]

Low-Power Computer and Communication Design

Low Power IP High power consumption is one of the road blocks toward small-form factor devices including wearable device. This research focuses on optimum bit-width of key digital element units in computer and communication systems to achieve low-power consumption. Related Publications: [Asilomar'05] [SiPS'04] [CIC'00] [ISCAS'98]
    Papers
  1. K. Han, B. L. Evans, and E.E.Swartzlander, Jr., ``Low-Power Multipliers with Data Wordlength Reduction,'' Proc. IEEE Asilomar Conf. on Signals, Systems, and Computers, Oct. 30-Nov. 2, 2005, pp. 1615-1619, Pacific Grove, CA USA. [pdf]
  2. K. Han, B. L. Evans, and E.E. Swartzlander, Jr., ``Data Wordlength Reduction for Low-Power Signal Processing Software,'' Proc. IEEE Workshop on Signal Processing Systems, Oct. 13-15, 2004, pp. 343-348, Austin, TX USA. [pdf]
  3. K. Han, I. Eo, K. Kim, and H. Cho, ``Bit Constraint Parameter Decision Method for CDMA Digital Demodulator,'' Proc. The 5th CDMA International Conference Exhibition, Nov. 2000, vol. 2, pp. 583-586, Seoul, Korea. [pdf]
  4. S. Nahm, K. Han, and W. Sung, ``A CORDIC-based Digital Quadrature Mixer: Comparison with ROM-based Architecture,'' Proc. IEEE International Symposium on Circuits and Systems, Jun., 1998, vol. 4, pp. 385 - 388, Monterey, CA USA. [pdf]
    Patents
  1. Ik-soo Eo, Kyungtae Han, Hae-bum Jung, Kyung-soo Kim, APPARATUS FOR SEARCHING MULTIPATH IN SPREAD SPECTRUM COMMUNICATIONS SYSTEM, issued Mar. 20, 2007, US Patent 7194018. [pdf]
  2. Kyungtae Han, In-Gi Lim, Ik-Soo Eo, Hye-Ju Seo, Kyung-Soo Kim, Hee-Bum Jung, and Han-Jin Cho, APPARATUS AND METHOD FOR SEPARATING CARRIER OF MULTICARRIER WIRELESS COMMUNICATION RECEIVER SYSTEM, issued Oct. 24, 2006, US Patent 7127012. [pdf]