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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
Electronics and Telecommunications Research Institute
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Volume & Issues
Volume 26, Issue 6 - Dec 2004
Volume 26, Issue 5 - Oct 2004
Volume 26, Issue 4 - Aug 2004
Volume 26, Issue 3 - Jun 2004
Volume 26, Issue 2 - Apr 2004
Volume 26, Issue 1 - Feb 2004
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Multi-Functional Probe Recording: Field-Induced Recording and Near-Field Optical Readout
Park, Kang-Ho ; Kim, Jeong-Yong ; Song, Ki-Bong ; Lee, Sung-Q ; Kim, Jun-Ho ; Kim, Eun-Kyoung ;
ETRI Journal, volume 26, issue 3, 2004, Pages 189~189
We demonstrate a high-speed recording based on field-induced manipulation in combination with an optical reading of recorded bits on Au cluster films using the atomic force microscope (AFM) and the near-field scanning optical microscope (NSOM). We reproduced 50 nm-sized mounds by applying short electrical pulses to conducting tips in a non-contact mode as a writing process. The recorded marks were then optically read using bent fiber probes in a transmission mode. A strong enhancement of light transmission is attributed to the local surface plasmon excitation on the protruded dots.
Improving Visual Accessibility for Color Vision Deficiency Based on MPEG-21
Yang, Seung-Ji ; Ro, Yong-Man ; Nam, Je-Ho ; Hong, Jin-Woo ; Choi, Sang-Yul ; Lee, Jin-Hak ;
ETRI Journal, volume 26, issue 3, 2004, Pages 195~195
In this paper, we propose a visual accessibility technique in an MPEG-21 framework. In particular, MPEG-21 visual accessibility for the colored-visual resource of a digital item is proposed to give better accessibility of color information to people with color vision deficiency (CVD). We propose an adaptation system for CVD as well as a description of CVD in MPEG-21. To verify the usefulness of the proposed method, computer simulations with CVD and color adaptation were performed. Furthermore, a statistical experiment was performed using volunteers with CVD in order to verify the effectiveness of the proposed visual accessibility technique in MPEG-21. Both the experimental and simulation results show that the proposed adaptations technique can provide better color information, particularly to people with CVD.
Streaming Media and Multimedia Conferencing Traffic Analysis Using Payload Examination
Kang, Hun-Jeong ; Kim, Myung-Sup ; Hong, James W. ;
ETRI Journal, volume 26, issue 3, 2004, Pages 203~203
This paper presents a method and architecture to analyze streaming media and multimedia conferencing traffic. Our method is based on detecting the transport protocol and port numbers that are dynamically assigned during the setup between communicating parties. We then apply such information to analyze traffic generated by the most popular streaming media and multimedia conferencing applications, namely, Windows Media, Real Networks, QuickTime, SIP and H.323. We also describe a prototype implementation of a traffic monitoring and analysis system that uses our method and architecture.
Evaluation of Geometric Modeling for KOMPSAT-1 EOC Imagery Using Ephemeris Data
Sohn, Hong-Gyoo ; Yoo, Hwan-Hee ; Kim, Seong-Sam ;
ETRI Journal, volume 26, issue 3, 2004, Pages 218~218
Using stereo images with ephemeris data from the Korea Multi-Purpose Satellite-1 electro-optical camera (KOMPSAT-1 EOC), we performed geometric modeling for three-dimensional (3-D) positioning and evaluated its accuracy. In the geometric modeling procedures, we used ephemeris data included in the image header file to calculate the orbital parameters, sensor attitudes, and satellite position. An inconsistency between the time information of the ephemeris data and that of the center of the image frame was found, which caused a significant offset in satellite position. This time inconsistency was successfully adjusted. We modeled the actual satellite positions of the left and right images using only two ground control points and then achieved 3-D positioning using the KOMPSAT-1 EOC stereo images. The results show that the positioning accuracy was about 12-17 m root mean square error (RMSE) when 6.6 m resolution EOC stereo images were used along with the ephemeris data and only two ground control points (GCPs). If more accurate ephemeris data are provided in the near future, then a more accurate 3-D positioning will also be realized using only the EOC stereo images with ephemeris data and without the need for any GCPs.
A Dual-Mode 2.4-GHz CMOS Transceiver for High-Rate Bluetooth Systems
Hyun, Seok-Bong ; Tak, Geum-Young ; Kim, Sun-Hee ; Kim, Byung-Jo ; Ko, Jin-Ho ; Park, Seong-Su ;
ETRI Journal, volume 26, issue 3, 2004, Pages 229~229
This paper reports on our development of a dual-mode transceiver for a CMOS high-rate Bluetooth system-onchip solution. The transceiver includes most of the radio building blocks such as an active complex filter, a Gaussian frequency shift keying (GFSK) demodulator, a variable gain amplifier (VGA), a dc offset cancellation circuit, a quadrature local oscillator (LO) generator, and an RF front-end. It is designed for both the normal-rate Bluetooth with an instantaneous bit rate of 1 Mb/s and the high-rate Bluetooth of up to 12 Mb/s. The receiver employs a dualconversion combined with a baseband dual-path architecture for resolving many problems such as flicker noise, dc offset, and power consumption of the dual-mode system. The transceiver requires none of the external image-rejection and intermediate frequency (IF) channel filters by using an LO of 1.6 GHz and the fifth order onchip filters. The chip is fabricated on a
die using a standard
CMOS technology. Experimental results show an in-band image-rejection ratio of 40 dB, an IIP3 of -5 dBm, and a sensitivity of -77 dBm for the Bluetooth mode when the losses from the external components are compensated. It consumes 42 mA in receive
quadrature phase-shift keying
mode of 8 Mb/s, 35 mA in receive GFSK mode of 1 Mb/s, and 32 mA in transmit mode from a 2.5-V supply. These results indicate that the architecture and circuits are adaptable to the implementation of a low-cost, multi-mode, high-speed wireless personal area network.
Improved Scalar Multiplication on Elliptic Curves Defined over
Lee, Dong-Hoon ; Chee, Seong-Taek ; Hwang, Sang-Cheol ; Ryou, Jae-Cheol ;
ETRI Journal, volume 26, issue 3, 2004, Pages 241~241
We propose two improved scalar multiplication methods on elliptic curves over
using Frobenius expansion. The scalar multiplication of elliptic curves defined over subfield
can be sped up by Frobenius expansion. Previous methods are restricted to the case of a small m. However, when m is small, it is hard to find curves having good cryptographic properties. Our methods are suitable for curves defined over medium-sized fields, that is,
. These methods are variants of the conventional multiple-base binary (MBB) method combined with the window method. One of our methods is for a polynomial basis representation with software implementation, and the other is for a normal basis representation with hardware implementation. Our software experiment shows that it is about 10% faster than the MBB method, which also uses Frobenius expansion, and about 20% faster than the Montgomery method, which is the fastest general method in polynomial basis implementation.
Synthesis of Silver Nanocrystallites by a New Thermal Decomposition Method and Their Characterization
Lee, Don-Keun ; Kang, Young-Soo ;
ETRI Journal, volume 26, issue 3, 2004, Pages 252~252
We formed silver nanocrystallites by the thermal decomposition of a
-oleate complex, which was prepared by a reaction with
and sodium oleate in a water solution. The resulting monodispersed silver nanocrystallites were produced by controlling the temperature (290
C). Transmission electron microscopic (TEM) images of the particles showed a 2-dimensional assembly of the particles with a diameter of
, demonstrating the uniformity of these nanocrystallites. An energy-dispersive X-ray (EDX) spectrum and X-ray diffraction (XRD) peaks of the nanocrystallites showed the highly crystalline nature of the silver structure. We analyzed the decomposition of the
-oleate complex using a Thermo Gravimetric Analyzer (TGA) and observed the crystallization process using XRD.
Amorphous Silicon Carbon Nitride Films Grown by the Pulsed Laser Deposition of a SiC-
Park, Nae-Man ; Kim, Sang-Hyeob ; Sung, Gun-Yong ;
ETRI Journal, volume 26, issue 3, 2004, Pages 257~257
We grew amorphous SiCN films by pulsed laser deposition using mixed targets. The targets were fabricated by compacting a mixture of SiC and
powders. We controlled the film stoichiometry by varying the mixing ratio of the target and the target-to-substrate distance. The mixing ratio of the target had a dominant effect on the film composition. We consider the structures of the SiCN films deposited using 30~70 wt.% SiC in the target to be an intermediate phase of SiC and
. This provides the possibility of growing homogeneous SiCN films with a mixed target at a moderate target-to-substrate distance.
A 42-GHz Wideband Cavity-Backed Slot Antenna with Thick Ground Plane
Lee, Jong-Moon ; Cho, Young-Heui ; Pyo, Cheol-Sig ; Choi, Ik-Guen ;
ETRI Journal, volume 26, issue 3, 2004, Pages 262~262
We investigate the characteristics of a wideband and high-gain cavity-backed slot antenna in terms of the reflection coefficients, radiation patterns, and gain. A cavity-backed slot antenna structure includes baffles, reflectors, and thick ground planes. The measured gain and bandwidth of a 10-dB return loss in a cavity-backed
array slot antenna with
mm, d=2 mm are 15.5 dBi and nearly 27%, respectively, at 42 GHz. Baffles and reflectors are used to increase antenna gain, thus reducing the coupling among the slots on the thick ground plane.
Capacity Scheduling for Heterogeneous Mobile Terminals in Broadband Satellite Interactive Networks
Lee, Ki-Dong ; Kim, Ho-Kyom ;
ETRI Journal, volume 26, issue 3, 2004, Pages 265~265
We develop a simple exact solution method for return link capacity allocation scheduling in a satellite interactive network using a hybrid code-division multiple access / time-division multiple access (CDMA/TDMA) scheme.
Threshold-Based Camera Motion Characterization of MPEG Video
Kim, Jae-Gon ; Chang, Hyun-Sung ; Kim, Jin-Woong ; Kim, Hyung-Myung ;
ETRI Journal, volume 26, issue 3, 2004, Pages 269~269
We propose an efficient scheme for camera motion characterization in MPEG-compressed video. The proposed scheme detects six types of basic camera motions through threshold-based qualitative interpretation, in which fixed thresholds are applied to motion model parameters estimated from MPEG motion vectors (MVs). The efficiency and robustness of the scheme are validated by the experiment with real compressed video sequences.
Filtering of Filter-Bank Energies for Robust Speech Recognition
Jung, Ho-Young ;
ETRI Journal, volume 26, issue 3, 2004, Pages 273~273
We propose a novel feature processing technique which can provide a cepstral liftering effect in the log-spectral domain. Cepstral liftering aims at the equalization of variance of cepstral coefficients for the distance-based speech recognizer, and as a result, provides the robustness for additive noise and speaker variability. However, in the popular hidden Markov model based framework, cepstral liftering has no effect in recognition performance. We derive a filtering method in log-spectral domain corresponding to the cepstral liftering. The proposed method performs a high-pass filtering based on the decorrelation of filter-bank energies. We show that in noisy speech recognition, the proposed method reduces the error rate by 52.7% to conventional feature.
Effective Periodic Poling in Optical Fibers
Kim, Jong-Bae ; Ju, Jung-Jin ; Kim, Min-Su ; Seo, Hong-Seok ;
ETRI Journal, volume 26, issue 3, 2004, Pages 277~277
The distributions of electric field and induced second-order nonlinearity are analyzed in the periodic poling of optical fibers. A quasi-phase matching efficiency for the induced nonlinearity is calculated in terms of both the electrode separation distance between the applied voltage and generalized electrode width for the periodic poling. Our analysis of the quasi-phase matching efficiency implies that the conversion efficiency can be enhanced through adjusting the separation distance, and the electrode width can be maximized if the electrode width is optimized.
Athermalized Polymeric Arrayed-Waveguide Grating by Partial Detachment from a Si Substrate
Lee, Jong-Moo ; Ahn, Joon-Tae ; Park, Sun-Tak ; Lee, Myung-Hyun ;
ETRI Journal, volume 26, issue 3, 2004, Pages 281~281
We demonstrate a new fabrication method for adjusting the temperature dependence of a polymeric arrayed-waveguide grating (AWG) on a Si substrate. A temperature-dependent wavelength shift of-0.1nm/
in a polymeric AWG on a Si substrate is reduced of+0.1nm/
by detaching part of the polymer film, including the grating channel region of the AWG, from the Si substrate while the other parts remain fixed on the substrate.