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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 27, Issue 6 - Dec 2005
Volume 27, Issue 5 - Oct 2005
Volume 27, Issue 4 - Aug 2005
Volume 27, Issue 3 - Jun 2005
Volume 27, Issue 2 - Apr 2005
Volume 27, Issue 1 - Feb 2005
Selecting the target year
A 77 GHz mHEMT MMIC Chip Set for Automotive Radar Systems
Kang, Dong-Min ; Hong, Ju-Yeon ; Shim, Jae-Yeob ; Lee, Jin-Hee ; Yoon, Hyung-Sup ; Lee, Kyung-Ho ;
ETRI Journal, volume 27, issue 2, 2005, Pages 133~133
A monolithic microwave integrated circuit (MMIC) chip set consisting of a power amplifier, a driver amplifier, and a frequency doubler has been developed for automotive radar systems at 77 GHz. The chip set was fabricated using a 0.15
gate-length InGaAs/InAlAs/GaAs metamorphic high electron mobility transistor (mHEMT) process based on a 4-inch substrate. The power amplifier demonstrated a measured small signal gain of over 20 dB from 76 to 77 GHz with 15.5 dBm output power. The chip size is 2mm
2mm. The driver amplifier exhibited a gain of 23 dB over a 76 to 77 GHz band with an output power of 13 dBm. The chip size is 2.1mm
2mm. The frequency doubler achieved an output power of -6 dBm at 76.5 GHz with a conversion gain of -16 dB for an input power of 10 dBm and a 38.25 GHz input frequency. The chip size is 1.2mm
1.2mm. This MMIC chip set is suitable for the 77 GHz automotive radar systems and related applications in a W-band.
Design, Implementation, and Validation of KOMPSAT-2 Software Simulator
Lee, Sang-Uk ; Lee, Byoung-Sun ; Kim, Jae-Hoon ; Cho, Sung-Ki ;
ETRI Journal, volume 27, issue 2, 2005, Pages 140~140
In this paper, we present design features, implementation, and validation of a satellite simulator subsystem for the Korea Multi-Purpose Satellite-2 (KOMPSAT-2). The satellite simulator subsystem is implemented on a personal computer to minimize costs and trouble on embedding onboard flight software into the simulator. An object-oriented design methodology is employed to maximize software reusability. Also, instead of a high-cost commercial database, XML is used for the manipulation of spacecraft characteristics data, telecommand, telemetry, and simulation data. The KOMPSAT-2 satellite simulator subsystem is validated by various simulations for autonomous onboard launch and early orbit phase operations, anomaly operation, and science fine mode operation. It is also officially verified by successfully passing various tests such as the satellite simulator subsystem test, mission control element system integration test, interface test, site installation test, and acceptance test.
A Spatial Audio System Using Multiple Microphones on a Rigid Sphere
Lee, Tae-Jin ; Jang, Dae-Young ; Kang, Kyeong-Ok ; Kim, Jin-Woong ; Jeong, Dae-Gwon ; Hamada, Hareo ;
ETRI Journal, volume 27, issue 2, 2005, Pages 153~153
The main purpose of a spatial audio system is to give a listener the same impression as if he/she were present in a recorded environment. A dummy head microphone is generally used for such purposes. Because of its human-like shape, we can obtain good spatial sound images. However, its shape is a restriction on its public use and it is difficult to convert a 2-channel recording into multi-channel signals for an efficient rendering over a multi-speaker arrangement. In order to solve the problems mentioned above, a spatial audio system is proposed that uses multiple microphones on a rigid sphere. The system has five microphones placed on special points of the rigid sphere, and it generates audio signals for headphone, stereo, stereo dipole, 4-channel, and 5-channel reproduction environments. Subjective localization experiments show that front/back confusion, which is a common limitation of spatial audio systems using the dummy head microphone, can be reduced dramatically in 4-channel and 5-channel reproduction environments and can be reduced slightly in a headphone reproduction.
Synthesis of Filtering Structures for Microstrip Active Antennas Using Orlov's Formula
Urbani, Fabio ; Bilotti, Filiberto ; Vegni, Lucio ;
ETRI Journal, volume 27, issue 2, 2005, Pages 166~166
In this paper, a synthesis technique for nonuniform filtering structures to be employed in active integrated antenna layouts is presented. The idea is to suppress the higher harmonic contribution due to the presence of nonlinear components through a nonuniform transmission line properly designed via Orlov's synthesis formula. The theory presented is applied here to synthesize an amplifier-based active antenna layout for wireless local area network (WLAN) purposes working at 2.4 GHz. The numerical results presented show the capabilities of the proposed approach.
Epipolar Geometry of Line Cameras Moving with Constant Velocity and Attitude
Habib, Ayman F. ; Morgan, Michel F. ; Jeong, Soo ; Kim, Kyung-Ok ;
ETRI Journal, volume 27, issue 2, 2005, Pages 172~172
Image resampling according to epipolar geometry is an important prerequisite for a variety of photogrammetric tasks. Established procedures for resampling frame images according to epipolar geometry are not suitable for scenes captured by line cameras. In this paper, the mathematical model describing epipolar lines in scenes captured by line cameras moving with constant velocity and attitude is established and analyzed. The choice of this trajectory is motivated by the fact that many line cameras can be assumed to follow such a flight path during the short duration of a scene capture (especially when considering space-borne imaging platforms). Experimental results from synthetic along-track and across-track stereo-scenes are presented. For these scenes, the deviations of the resulting epipolar lines from straightness, as the camera's angular field of view decreases, are quantified and presented.
Solution-Processible Blue-Light-Emitting Polymers Based on Alkoxy-Substituted Poly(spirobifluorene)
Lee, Jeong-Ik ; Chu, Hye-Yong ; Oh, Ji-Young ; Do, Lee-Mi ; Lee, Hyo-Young ; Zyung, Tae-Hyoung ; Lee, Jae-Min ; Shim, Hong-Ku ;
ETRI Journal, volume 27, issue 2, 2005, Pages 181~181
Alkoxy-substituted poly(spirobifluorene)s and their copolymers with a triphenylamine derivative have been synthesized by Ni(0)-mediated polymerization. The polymers were well soluble in common organic solvents. Pure blue-light emissions without the long wavelength emission of poly(fluorene)s have been observed in the fluorescence spectra of polymer thin films. The light emitting diodes with a device configuration of ITO/PEDT:PSS(30 nm)/polymer(60 nm)/LiF(1 nm)/Al(100 nm) have been fabricated. The electroluminescence spectra showed the blue emissions without the long wavelength emission as observed in the fluorescence spectra. The relatively poor electroluminescence quantum yield of the homopolymer (0.017% @ 20
) with color coordinates of (0.16, 0.07) has been improved by the introduction of triphenylamine moiety, and the copolymer with derivative exhibited an electroluminescence quantum yield of 0.15 % at 20
with color coordinates of (0.16, 0.08). Moreover, the introduction of polar side chains to the spirobifluorene moiety enhanced the device performance and led to the quantum yields of 0.6 to 0.7 % at 20
, although there was some expense of color purities.
Laser Process Proximity Correction for Improvement of Critical Dimension Linearity on a Photomask
Park, Jong-Rak ; Kim, Hyun-Su ; Kim, Jin-Tae ; Sung, Moon-Gyu ; Cho, Won-Il ; Choi, Ji-Hyun ; Choi, Sung-Woon ;
ETRI Journal, volume 27, issue 2, 2005, Pages 188~188
We report on the improvement of critical dimension (CD) linearity on a photomask by applying the concept of process proximity correction to a laser lithographic process used for the fabrication of photomasks. Rule-based laser process proximity correction (LPC) was performed using an automated optical proximity correction tool and we obtained dramatic improvement of CD linearity on a photomask. A study on model-based LPC was executed using a two-Gaussian kernel function and we extracted model parameters for the laser lithographic process by fitting the model-predicted CD linearity data with measured ones. Model-predicted bias values of isolated space (I/S), arrayed contact (A/C) and isolated contact (I/C) were in good agreement with those obtained by the nonlinear curve-fitting method used for the rule-based LPC.
Error Free Butcher Algorithms for Linear Electrical Circuits
Murugesan, K. ; Gopalan, N.P. ; Gopal, Devarajan ;
ETRI Journal, volume 27, issue 2, 2005, Pages 195~195
In this paper, an error-free Butcher algorithm is introduced to study the singular system of a linear electrical circuit for time invariant and time varying cases. The discrete solutions obtained using Runge-Kutta (RK)-Butcher algorithms are compared with the exact solutions of the electrical circuit problem and are found to be very accurate. Stability regions for the single term Walsh series (STWS) method and the RK-Butcher algorithm are presented. Error graphs for inductor currents and capacitor voltages are presented in a graphical form to show the efficiency of the RK-Butcher algorithm. This RK-Butcher algorithm can be easily implemented in a digital computer for any singular system of electrical circuits.
Measuring Economic Externalities of IT and R&D
Rim, Myung-Hwan ; Cho, Sang-Sup ; Moon, Choon-Geol ;
ETRI Journal, volume 27, issue 2, 2005, Pages 206~206
We measure and compare externalities of IT and R&D capital stocks in different Korean industry sectors using inter-industry input-output tables of 1985, 1990, 1995 and 2000. We also compute the multiplier effects that relate to the directions of future economic effects. The key findings are as follows. First, we observed continuous capital deepening in all nine industries over the period of 1985 to 2000. Second, the backward multipliers of IT capital were the highest in the manufacturing industry. As for inter-industry externalities, the indirect backward multipliers, which exclude intra-industry backward multiplier effects within the industry, were also the highest in the manufacturing industry. Third, the forward multiplier effects of IT capital stock were the most substantial in the construction industry during the 1980s and in the manufacturing industry thereafter. Finally, using the transition multiplier matrix reflecting the backward effects of the two capitals in the past, the economic backward effects, especially the external economic effects, are predicted to increase through 2010 among all industries. The above findings suggest that, in order to maximize the forward and backward effects of the ever-increasing IT capital, we need to formulate an industry policy reducing the cost of capital accumulation in the manufacturing industry through improvement in productivity of the IT industry.
A Model-Based Analysis of Secure Video Transmission Based on IPSec and IPv4
Van, Quang-Dao ; Wei, Anne ; Geller, Benoit ; Dupeyrat, Gerard ;
ETRI Journal, volume 27, issue 2, 2005, Pages 219~219
A promising solution to protect wired Internet networks is to use the Secure Internet Protocol (IPSec); however, this has some drawbacks, particularly on the quality of service (QoS). This paper aims at evaluating the video traffic QoS in terms of end-to-end delay and packet loss rate. Based on some basic assumptions, our analysis shows that the performance with IPSec is rapidly inferior to the IPv4 performance. We thus suggest adding some QoS parameters into IPSec in order to achieve a compromise between QoS and security.
A Simplified Decoding Algorithm Using Symbol Transformation for Turbo Pragmatic Trellis-Coded Modulation
Choi, Eun-A ; Oh, Deock-Gil ; Jung, Ji-Won ; Kim, Nae-Soo ; Kim, Young-Wan ;
ETRI Journal, volume 27, issue 2, 2005, Pages 223~223
This paper presents the application of a turbo coding technique combined with a bandwidth efficient method known as trellis-coded modulation. A transformation applied to the incoming I-channel and Q-channel symbols allows the use of an off-the-shelf binary/quadrature phase shift keying (B/QPSK) turbo decoder without any modifications. A conventional turbo decoder then operates on transformed symbols to estimate the coded bits. The uncoded bits are decoded based on the estimated coded bits and locations of the received symbols.
Specific Absorption Rate Values of Handsets in Cheek Position at 835 MHz as a Function of Scaled Specific Anthropomorphic Mannequin Models
Lee, Ae-Kyoung ; Choi, Hyung-Do ; Choi, Jae-Ick ; Pack, Jeong-Ki ;
ETRI Journal, volume 27, issue 2, 2005, Pages 227~227
A specific anthropomorphic mannequin (SAM) model was used to investigate the relation between local specific absorption rate (SAR) and head size. The model was scaled to 80 to 100% sized models at intervals of 5%. We assumed that the shell of the SAM model has the same properties as the head-equivalent tissue. Five handsets with a monopole antenna operating at 835 MHz were placed in the approximate cheek position against the scaled SAM models. The handsets had different antenna lengths, antenna positions, body sizes, and external materials. SAR distributions in the scaled SAM models were computed using the finite-difference time-domain method. We found that a larger head causes a distinct increase in the spatial peak 1-voxel SAR, while head size did not significantly change the peak 1-g averaged-SAR and 10-g averaged-SAR values for the same power level delivered to the antenna.
An Embedded ACELP Speech Coding Based on the AMR-WB Codec
Byun, Kyung-Jin ; Eo, Ik-Soo ; Jeong, Hee-Bum ; Hahn, Min-Soo ;
ETRI Journal, volume 27, issue 2, 2005, Pages 231~231
This letter proposes a new embedded speech coding structure based on the Adaptive Multi-Rate Wideband (AMR-WB) standard codec. The proposed coding scheme consists of three different bitrates where the two lower bitrates are embedded into the highest one. The embedded bitstream was achieved by modifying the algebraic codebook search procedure adopted for the AMR-WB codec. The proposed method provides the advantage of scalability due to the embedded bitstream, while it inevitably requires some additional computational complexity for obtaining two different code vectors of the higher bitrate modes. Compared to the AMR-WB codec, the embedded coder shows improved speech qualities for two higher bitrate modes with a slightly increased bitrate caused by the decreased coding efficiency of the algebraic codebook.
Shrink-Wrapped Boundary Face Algorithm for Mesh Reconstruction from Unorganized Points
Koo, Bon-Ki ; Choi, Young-Kyu ; Chu, Chang-Woo ; Kim, Jae-Chul ; Choi, Byoung-Tae ;
ETRI Journal, volume 27, issue 2, 2005, Pages 235~235
A new mesh reconstruction scheme for approximating a surface from a set of unorganized 3D points is proposed. The proposed method, called a shrink-wrapped boundary face (SWBF) algorithm, produces the final surface by iteratively shrinking the initial mesh generated from the definition of the boundary faces. SWBF surmounts the genus-0 spherical topology restriction of previous shrink-wrapping-based mesh generation techniques and can be applied to any type of surface topology. Furthermore, SWBF is significantly faster than a related algorithm of Jeong and others, as SWBF requires only a local nearest-point-search in the shrinking process. Our experiments show that SWBF is very robust and efficient for surface reconstruction from an unorganized point cloud.
CDBA-Based Synthetic Floating Inductance Circuits with Electronic Tuning Properties
Keskin, Ali Umit ; Hancioglu, Erhan ;
ETRI Journal, volume 27, issue 2, 2005, Pages 239~239
This paper introduces two different current differencing buffered amplifier (CDBA)-based synthetic floating inductance circuits. Both configurations use a grounded capacitor. They are fully integrable and provide the advantages of electronic tuning.