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Lee D.-G.,Pusan National University | Choi D.,Electronic and Telecommunications Research Institute ETRI | Seo J.,The Attached Institute of ETRI | Kim H.,Pusan National University
Sensors (Switzerland) | Year: 2013

In this paper, we present a new reset tree-based scheme to protect cryptographic hardware against optical fault injection attacks. As one of the most powerful invasive attacks on cryptographic hardware, optical fault attacks cause semiconductors to misbehave by injecting high-energy light into a decapped integrated circuit. The contaminated result from the affected chip is then used to reveal secret information, such as a key, from the cryptographic hardware. Since the advent of such attacks, various countermeasures have been proposed. Although most of these countermeasures are strong, there is still the possibility of attack. In this paper, we present a novel optical fault detection scheme that utilizes the buffers on a circuit's reset signal tree as a fault detection sensor. To evaluate our proposal, we model radiation-induced currents into circuit components and perform a SPICE simulation. The proposed scheme is expected to be used as a supplemental security tool. © 2013 by the authors; licensee MDPI, Basel, Switzerland.


Jang I.,Electronic and Telecommunications Research Institute ETRI | Kudumakis P.,Queen Mary, University of London | Sandler M.,Queen Mary, University of London | Kang K.,Electronic and Telecommunications Research Institute ETRI
IEEE Signal Processing Magazine | Year: 2011

The music industry is going through a transformation, and new interactive music services have emerged. It is envisaged that this new concept of digital music content will dominate the next generation of music services. A standardized file format is inevitably required to provide the interoperability between various interactive music players and interactive music albums. This issue is addressed in a new standard by the Moving Picture Experts Group (MPEG), known as the MPEG-A Interactive Music Application Format (IM AF). IM AF integrates multiple audio tracks with appropriate additional information, enabling users to experience various preset mixes and to make their own mixes complying with interactivity rules imposed by the music composers with the aim of fitting their artistic creation. © 2010 IEEE.


Choi J.H.,Electronic and Telecommunications Research Institute ETRI | Cha J.,Electronic and Telecommunications Research Institute ETRI
International Conference on Advanced Communication Technology, ICACT | Year: 2011

The DMB filecasting service is able to provide peoples with crystal-clear video and theatre-quality audio as well as downloadable richmedia services such as personalized and interactive multimedia service on the move via in-vehicle terminals or hand-held gadgets like mobile phones. In this paper, we explain about the DMB filecasting service and propose the transmission method of signalling information and DMB contents for the DMB filecasting service. © 2011 Global IT Research Inst.


Wang D.,University of Calgary | Leung H.,University of Calgary | Kurian A.P.,University of Calgary | Kim H.-J.,Electronic and Telecommunications Research Institute ETRI | Yoon H.,Electronic and Telecommunications Research Institute ETRI
IEEE Transactions on Instrumentation and Measurement | Year: 2010

Reverberation deteriorates the quality and intelligibility of speech, leading to the poor performance of classification systems. Room reverberation parameters depend on the location of the speaker and the microphone and the room geometry. For mobile robots, the reverberation is constantly changing due to the relative movement of the speaker and the robot. This can affect the spectral properties of the signal and therefore, the classification accuracy. The contribution of this paper is a new network architecture, which uses neural network constant modulus algorithm (NNCMA) based equalizer followed by a multi-layer preceptron (MLP) classifier. NNCMA is an MLP which is trained with a cost function similar to constant modulus algorithm (CMA). With this two-stage structure, the classifier does not have to consider the time-varying nature of the reverberation. The proposed algorithm is applied to speech samples collected by the home service robot WEVER-R2 for speaker classification in a typical home or office environment. We use them for gender classification application. The proposed neural network was found to have 83.73% of classification accuracy for age classification and 88.91% of classification accuracy for gender classification, while the standard MLP had a classification accuracy of 71.43% and 72.29%, respectively. © 2006 IEEE.


Teguh Yudistira H.,Sungkyunkwan University | Pradhipta Tenggara A.,Sungkyunkwan University | Dat Nguyen V.,Sungkyunkwan University | Teun Kim T.,Korea Advanced Institute of Science and Technology | And 4 more authors.
Applied Physics Letters | Year: 2013

Metamaterial is an engineered material whose electromagnetic properties can be determined by the unit structure. Lithography is one of main methods to fabricate metamaterials for fine patterning which has limitations in large-area fabrication. We present a direct fabrication method for metamaterial using the electrohydrodynamic jet printing. An electrical pulse was controlled to make drop-on-demand operation, through which flexible high refractive-index metamaterial could be fabricated in the form of I-shaped silver electrodes with 10-μm widths and 5-μm gaps on polyimide substrate. The peak value of the refractive index was 18.4 at a frequency of around 0.48 THz. © 2013 AIP Publishing LLC.

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