[CHI07] Dynamics of Tilt-based Browsing on Mobile Devices

Sung-Jung Cho, Roderick Murray-Smith, Changkyu Choi, Younghoon Sung, Kwanghyeon Lee, and Yeun-Bae Kim, "Dynamics of Tilt-based Browsing on Mobile Devices," in proceedings of ACM SIG CHI Conference, April 28-May 3, 2007, San Jose, USA.

[IROS05] Real-Time Audio-Visual Localization of User Using Microphone Array and Vision Camera

Changkyu Choi, Donggeon Kong, Sujin Lee, Kiyoung Park, Sun-Gi Hong, Hyoung-Ki Lee, Seokwon Bang, Yongbeom Lee, and Sangryong Kim, "Real-Time Audio-Visual Localization of User Using Microphone Array and Vision Camera," in proceedings of IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), August 2-6, 2005, Edmonton, Alberta, Canada.

[A prototype of Samsung Home Robot(SHR-100) developed by Advanced Systems Research Lab. of Samsung Advanced Institute of Technology(SAIT) and Mechatronics Center of Samsung Electronics.]

["Call-and-Come" demonstration in nonstationary noise environment.]

[Visualizing the internal processing of the robot during the demonstration.]

[ICSLP04] Separation of Multiple Concurrent Speeches Using Audio-Visual Speaker Localization and Minimum Variance Beam-forming

Changkyu Choi, Donggeon Kong, Sang Min Yoon, Hyoung-Ki Lee, "Separation of Multiple Concurrent Speeches Using Audio-Visual Speaker Localization and Minimum Variance Beam-forming," in proceedings of International Conference on Spoken Language Processing, October 4-8, 2004, Jeju, KOREA.

[Eight-channel simultaneous recordings of the mixed source signals and music.]
[Three separated speeches by the proposed method.]

[Three separated speeches are further enhanced by the adaptive cross-channel interference canceler (ACCIC).]

[ICA04] Adaptive Cross-Channel Interference Cancellation on Blind Source Separation Outputs

Changkyu Choi, Gil-Jin Jang, Yongbeom Lee, and Sangryong Kim, "Adaptive Cross-Channel Interference Cancellation on Blind Source Separation Outputs," in proceedings of International Conference on Independent Component Analysis and Blind Signal Separation, September 22-24, 2004, Granada, Spain.

[ICSLP04] Voice activity detection using global soft decision with mixture of Gaussian model

Kiyoung park, Changkyu Choi, Jeongsu Kim, "Voice activity detection using global soft decision with mixture of Gaussian model," in proceedings of International Conference on Spoken Language Processing (ICSLP), October 4-8, 2004, Jeju, KOREA.

[IROS03] Speech Enhancement and Recognition Using Circular Microphone Array For Service Robots

Changkyu Choi, Donggeon Kong, Jaywoo Kim, and Seokwon Bang, "Speech Enhancement and Recognition Using Circular Microphone Array For Service Robots," in proceedings of IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS), October 27-31, 2003, Las Vegas, USA.


[Experimental Environment Consisting of a Service Robot, a Target Talker, and TwoInterfering Loud Speakers]

[An Example of Speech Enhancement and Separation For Several Noisy Words: A fan noise was used and d = 2m.]

[ICA03] Real-Time Binaural Blind Source Separation

Changkyu Choi, "Real-Time Binaural Blind Source Separation," in proceedings of International Conference on Independent Component Analysis and Blind Signal Separation, April 1-4, 2003, Nara, JAPAN.

pdf: http://www.kecl.ntt.co.jp/icl/signal/ica2003/cdrom/data/0156.pdf
Errata: The M must be changed to L/2 in equations (5), (9), and (10).

[Four Original Source, Two Noisy Mixtures, and Four Denoised and Separated Sources.

[ICA01] Speech Enhancement Using Sparse Code Shrinkage and Global Soft Decision

Changkyu Choi, Seungho Choi, and Sang-Ryong Kim, "Speech Enhancement Using Sparse Code Shrinkage and Global Soft Decision," in proceedings of International Conference on Independent Component Analysis and Blind Signal Separation, December 9-12, 2001, San Diego, California, USA.

[An Example of Speech Enhancement: A white Gaussian noise (10dB) was used.]

(Clean, Noisy, and Enhanced Speeches are available upon request.)

[ISCOM01] Face Detection Using Consecutive Bootstrapping ICA

Taekyun Kim, Changkyu Choi, and Sang-Ryong Kim, "Face Detection Using Consecutive Bootstrapping ICA," in proceedings of the 6th Biennial International Symposium on Communications (ISCOM) , November 13-16, 2001, Tainan, Taiwan.

[Examples of Face Detection Results.]