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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Electronics and Telecommunications Research Institute
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Volume & Issues
Volume 28, Issue 6 - Dec 2006
Volume 28, Issue 5 - Oct 2006
Volume 28, Issue 4 - Aug 2006
Volume 28, Issue 3 - Jun 2006
Volume 28, Issue 2 - Apr 2006
Volume 28, Issue 1 - Feb 2006
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Performance Enhancement of Low-Cost Land Navigation System for Location-Based Service
Cho, Seong-Yun ; Choi, Wan-Sik ;
ETRI Journal, volume 28, issue 2, 2006, Pages 131~144
This work demonstrates a dead-reckoning (DR) scheme for a low-cost land navigation system and a DR/GPS system design using the sigma point Kalman filter (SPKF). T hrough an observability analysis and some simulations, it is shown that the performances of a stand-alone DR system and DR/GPS system can be improved by employing the proposed DR scheme and SPKF. By using the designed DR scheme and filter, the stand-alone DR system does not have any undetectable errors occurring on the curve trajectory. And the DR/GPS system can provide a stable and seamless navigational solution even in the case where the initial heading estimation error is large, such as 160 degrees, or when the GPS signal is unavailable due to tunnels, buildings, and so on. Simulation results indicate a satisfactory performance of the proposed system.
Scalable Interframe Wavelet Coding with Low Complex Spatial Wavelet Transform
Kim, Won-Ha ; Jeong, Se-Yoon ; Kim, Kyu-Heon ;
ETRI Journal, volume 28, issue 2, 2006, Pages 145~154
In the decoding process associated with interframe wavelet coding, the inverse wavelet transform requires high computational complexity. However, as video technology starts to pervade all aspects of our lives, decoders are becoming required in various devices such as PDAs, notebooks, PCs, and set-top boxes. Therefore, a decoder's complexity needs to be adapted to the processor's computational power, and consequently a low-complexity codec is also required for scalable video coding. In this paper, we propose a method of controlling and lowering the complexity of the spatial wavelet transform while sustaining the same coding efficiency as that currently afforded. In addition, the proposed method may alleviate the ringing effect for slowly changing image sequences.
A Least Squares Approach to Escalator Algorithms for Adaptive Filtering
Kim, Nam-Yong ;
ETRI Journal, volume 28, issue 2, 2006, Pages 155~161
In this paper, we introduce an escalator (ESC) algorithm based on the least squares (LS) criterion. The proposed algorithm is relatively insensitive to the eigenvalue spread ratio (ESR) of an input signal and has a faster convergence speed than the conventional ESC algorithms. This algorithm exploits the fast adaptation ability of least squares methods and the orthogonalization property of the ESC structure. From the simulation results, the proposed algorithm shows superior convergence performance.
Automatic Surface Matching for the Registration of LIDAR Data and MR Imagery
Habib, Ayman F. ; Cheng, Rita W.T. ; Kim, Eui-Myoung ; Mitishita, Edson A. ; Frayne, Richard ; Ronsky, Janet L. ;
ETRI Journal, volume 28, issue 2, 2006, Pages 162~174
Several photogrammetric and geographic information system applications such as surface matching, object recognition, city modeling, environmental monitoring, and change detection deal with multiple versions of the same surface that have been derived from different sources and/or at different times. Surface registration is a necessary procedure prior to the manipulation of these 3D datasets. This need is also applicable in the field of medical imaging, where imaging modalities such as magnetic resonance imaging (MRI) can provide temporal 3D imagery for monitoring disease progression. This paper will present a general automated surface registration procedure that can establish correspondences between conjugate surface elements. Experimental results using light detection and ranging (LIDAR) and MRI data will verify the feasibility, robustness, and accuracy of this approach.
New CMOS Fully-Differential Transconductor and Application to a Fully-Differential Gm-C Filter
Shaker, Mohamed O. ; Mahmoud, Soliman A. ; Soliman, Ahmed M. ;
ETRI Journal, volume 28, issue 2, 2006, Pages 175~181
A new CMOS voltage-controlled fully-differential transconductor is presented. The basic structure of the proposed transconductor is based on a four-MOS transistor cell operating in the triode or saturation region. It achieves a high linearity range of
at a 1.5 V supply voltage. The proposed transconductor is used to realize a new fully-differential Gm-C low-pass filter with a minimum number of transconductors and grounded capacitors. PSpice simulation results for the transconductor circuit and its filter application indicating the linearity range and verifying the analytical results using
technology are also given.
Circuit Modeling of Interdigitated Capacitors Fabricated by High-K LTCC Sheets
Kim, Kil-Han ; Ahn, Min-Su ; Kang, Jung-Han ; Yun, Il-Gu ;
ETRI Journal, volume 28, issue 2, 2006, Pages 182~190
The circuit modeling of interdigitated capacitors fabricated by high-k low-temperature co-fired ceramic (LTCC) sheets was investigated. The s-parameters of each test structure were measured from 50 MHz to 10 GHz, and the modeling was performed using these measured sparameters up to the first resonant frequency. Each test structure was divided into appropriate building blocks. The equivalent circuit of each building block was composed based on the partial element equivalent circuit (PEEC) method. Modeling was executed to optimize the parameters in the equivalent circuit of each building block. The validity of the extracted parameters was verified by the predictive modeling for the test structures with different geometry. After that, Monte Carlo analysis and sensitivity analysis were performed based on the extracted parameters. The modeling methodology can allow a device designer to improve the yield and to save time and cost for the design and manufacturing of devices.
A Data Quality Management Maturity Model
Ryu, Kyung-Seok ; Park, Joo-Seok ; Park, Jae-Hong ;
ETRI Journal, volume 28, issue 2, 2006, Pages 191~204
Many previous studies of data quality have focused on the realization and evaluation of both data value quality and data service quality. These studies revealed that poor data value quality and poor data service quality were caused by poor data structure. In this study we focus on metadata management, namely, data structure quality and introduce the data quality management maturity model as a preferred maturity model. We empirically show that data quality improves as data management matures.
An Analysis of Consumer Preferences among Wireless LAN and Mobile Internet Services
Ahn, Ji-Woon ; Lee, Jong-Su ; Lee, Jeong-Dong ; Kim, Tai-Yoo ;
ETRI Journal, volume 28, issue 2, 2006, Pages 205~215
Wireless data communication (WDC) services are increasingly penetrating the market. The two main alternative WDC technologies are wireless LAN and mobile Internet. Services based on these technologies display differences in quality attributes such as terminal device, data transmission speed, pricing scheme and so on. How consumers choose between these two alternatives will be determined by their preferences regarding such quality attributes. In turn, their preferences will affect the evolution of WDC services and related technologies. This study employs a conjoint analysis of consumer valuations of quality attributes of wireless LAN and mobile Internet services. Respondents rate hypothetical service alternatives featuring various combinations of quality attributes. By estimating consumer willingness to pay for the attributes of WDC services, the authors predict the evolution of WDC services and related technologies along various quality dimensions, make a comparison with the results of a previous study, and draw policy implications for national-and company-level R&D strategies.
An RFID Tag Using a Planar Inverted-F Antenna Capable of Being Stuck to Metallic Objects
Choi, Won-Kyu ; Son, Hae-Won ; Bae, Ji-Hoon ; Choi, Gil-Young ; Pyo, Cheol-Sig ; Chae, Jong-Suk ;
ETRI Journal, volume 28, issue 2, 2006, Pages 216~218
This letter presents the design for a low-profile planar inverted-F antenna (PIFA) that can be stuck to metallic objects to create a passive radio frequency identification (RFID) tag in the UHF band. The designed PIFA, which uses a dielectric substrate for the antenna, consists of a U-slot patch for size reduction, several shorting pins, and a coplanar waveguide feeding structure to easily integrate with an RFID chip. The impedance bandwidth and maximum gain of the tag antenna are about 0.3% at 914 MHz for a voltage standing wave ratio (VSWR) of less than 2 and 3.6 dBi, respectively. The maximum read range is about 4.5 m as long as the tag antenna is on a metallic object.
Angle-Based Virtual Source Location Representation for Spatial Audio Coding
Beack, Seung-Kwon ; Seo, Jeong-Il ; Moon, Han-Gil ; Kang, Kyeong-Ok ; Hahn, Min-Soo ;
ETRI Journal, volume 28, issue 2, 2006, Pages 219~222
Virtual source location information (VSLI) has been newly utilized as a spatial cue for compact representation of multichannel audio. This information is represented as the azimuth of the virtual source vector. The superiority of VSLI is confirmed by comparison of the spectral distances, average bit rates, and subjective assessment with a conventional cue.
General Coupling Matrix Synthesis Method for Microwave Resonator Filters of Arbitrary Topology
Uhm, Man-Seok ; Lee, Ju-Seop ; Yom, In-Bok ; Kim, Jeong-Phill ;
ETRI Journal, volume 28, issue 2, 2006, Pages 223~226
This letter presents a new approach to synthesize the resonator filters of an arbitrary topology. This method employs an optimization method based on the relation between the polynomial coefficients of the transfer function and those of the
from the coupling matrix. Therefore, this new method can also be applied to self-equalized filters that were not considered in the conventional optimization methods. Two microwave filters, a symmetric 4-pole filter with four transmission zeros (TZs) and an asymmetric 8-pole filter with seven TZs, are synthesized using the present method for validation. Excellent agreement between the response of the transfer function and that of the synthesized
from the coupling matrix is shown.
Numerical Algorithm for Phase Offsets of Binary Codes in the Code Division Multiple Access System
Park, Hong-Goo ;
ETRI Journal, volume 28, issue 2, 2006, Pages 227~230
There has been a growing need for increased capacity in cellular systems. This has resulted in the adoption of the code division multiple access (CDMA) system as a multiple channel access method. Thus, it is important to obtain the phase offsets of binary codes in the CDMA system because distinct phase offsets of the same code are used to distinguish signals received at the mobile station from different base stations. This letter proposes an efficient algorithm to compute the phase offset of a binary code in the CDMA system through the use of the basic facts of number theory and a new notion of the subcodes of a given code. We also formulate the algorithm in a compact form.
Useful Characteristics for Controlling the Cancellation Performance and Center Frequency of a Linearization Loop
Kang, Sang-Gee ; Hong, Sung-Yong ;
ETRI Journal, volume 28, issue 2, 2006, Pages 231~234
The cancellation performance of a linearization loop is limited by the degree of an amplitude imbalance and a phase imbalance. A delay mismatch causes a phase variation as a function of frequency. Therefore, the cancellation performance and linearization bandwidth are limited by a delay mismatch. The expression for the effects of an amplitude imbalance, a phase imbalance, and a delay mismatch on the characteristics of a linearization loop is derived and analyzed. The simulation results are compared with the results obtained by means of using a commercial simulation tool and the exact agreement is reported. The derived equation could be used in designing a linearization loop and predicting the cancellation performance of the linearization loop usefully. Some useful characteristics, known from the simulation results obtained by using the derived equation, of a linearization loop for designing and implementing feedforward amplifiers are described in detail.
The Minimum PAPR Code for OFDM Systems
Kang, Seog-Geun ;
ETRI Journal, volume 28, issue 2, 2006, Pages 235~238
In this letter, a block code that minimizes the peak-to-average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) signals is proposed. It is shown that peak envelope power is invariant to cyclic shift and codeword inversion. The systematic encoding rule for the proposed code is composed of searching for a seed codeword, shifting the register elements, and determining codeword inversion. This eliminates the look-up table for one-to-one correspondence between the source and the coded data. Computer simulation confirms that OFDM systems with the proposed code always have the minimum PAPR.
Multiple Region-of-Interest Support in Scalable Video Coding
Bae, Tae-Meon ; Thang, Truong Cong ; Kim, Duck-Yeon ; Ro, Yong-Man ; Kang, Jung-Won ; Kim, Jae-Gon ;
ETRI Journal, volume 28, issue 2, 2006, Pages 239~242
In this letter, we propose a new functionality to scalable video coding (SVC), that is, the support of multiple region of interests (ROIs) for heterogeneous display resolution. The main objective of SVC is to provide temporal, spatial, and quality scalability of an encoded bitstream. The ROI is an area that is semantically important to a particular user, especially users with heterogeneous display resolutions. Less transmission bandwidth is needed compared to when the entire region is transmitted/decoded and then sub-sampled or cropped. To support multiple ROIs in SVC, we adopt flexible macroblock ordering (FMO), a tool defined in H.264, and based on it, we propose a way to encode and, independently, decode ROIs. The proposed method is implemented on the joint scalable video model (JSVM) and its functionality verified.
Name-Based Autoconfiguration for Mobile Ad hoc Networks
Kim, Nam-Hoon ; Kang, Sae-Hoon ; Lee, Young-Hee ; Lee, Ben ;
ETRI Journal, volume 28, issue 2, 2006, Pages 243~246
In a mobile ad hoc network, difficulties exist in supporting address autoconfiguration and naming resolution due to the lack of centralized servers. This letter presents a novel approach, called name-based autoconfiguration (NBA), which uses host names to determine IP addresses and provides address autoconfiguration and name resolution as a single protocol.
A 3-D Propagation Model Considering Building Transmission Loss for Indoor Wireless Communications
Choi, Myung-Sun ; Park, Han-Kyu ; Heo, Youn-Hyoung ; Oh, Sang-Hoon ; Myung, Noh-Hoon ;
ETRI Journal, volume 28, issue 2, 2006, Pages 247~249
In the development of a new wireless communications system, a versatile and accurate radio channel for indoor communications is needed. In particular, the investigation of radio transmission into buildings is very important. In this letter, we present an improved three-dimensional electromagnetic wave propagation prediction model for indoor wireless communications that takes into consideration building penetration loss. A ray tracing technique based on an image method is also employed in this study. Three-dimensional models can predict any complex indoor environment composed of arbitrarily shaped walls. A speed-up algorithm, which is a modified deterministic ray tube method, is also introduced for efficient prediction and computation.
Signal-Dependent Chaotic-State-Modulated Digital Secure Communication
Farooq, Omar ; Datta, Sekharjit ;
ETRI Journal, volume 28, issue 2, 2006, Pages 250~252
In this letter, a discrete state, discrete time chaotic pseudo random number generator (CPRNG) is presented for stream ciphering of text, audio, or image data. The CPRNG is treated as a finite state machine, and its state is modulated according to the input bit sequence of the signal to be encrypted. The modulated state sequence obtained can be transmitted as a spread spectrum or encrypted data.
A New Strained-Si Channel Power MOSFET for High Performance Applications
Cho, Young-Kyun ; Roh, Tae-Moon ; Kim, Jong-Dae ;
ETRI Journal, volume 28, issue 2, 2006, Pages 253~256
We propose a novel power metal oxide semiconductor field effect transistor (MOSFET) employing a strained-Si channel structure to improve the current drivability and on-resistance characteristic of the high-voltage MOSFET. A 20 nm thick strained-Si low field channel NMOSFET with a
buffer layer improved the drive current by 20% with a 25% reduction in on-resistance compared with a conventional Si channel high-voltage NMOSFET, while suppressing the breakdown voltage and subthreshold slope characteristic degradation by 6% and 8%, respectively. Also, the strained-Si high-voltage NMOSFET improved the transconductance by 28% and 52% at the linear and saturation regimes.
Transmission Fiber Chromatic Dispersion Dependence on Temperature: Implications on 40 Gb/s Performance
Andre, Paulo S. ; Teixeira, Antonio L. ; Pinto, Armando N. ; Pellegrino, Lara P. ; Neto, Berta B. ; Rocha, Jose F. ; Pinto, Joao L. ; Monteiro, Paulo N. ;
ETRI Journal, volume 28, issue 2, 2006, Pages 257~259
In this letter, we will evaluate the performance degradation of a 40 km high-speed (40 Gb/s) optical system, induced by optical fiber variations of the chromatic dispersion induced by temperature changes. The chromatic dispersion temperature sensitivity will be estimated based on the signal quality parameters.
A Low-Complexity and High-Quality Image Compression Method for Digital Cameras
Xie, Xiang ; Li, Guolin ; Wang, Zhihua ;
ETRI Journal, volume 28, issue 2, 2006, Pages 260~263
This letter proposes a new near-lossless image compression method with only one line buffer cost for a digital camera with Bayer format image. For such format data, it can provide a low average compression rate (4.24bits/pixel) with high-image quality (larger than 46.37dB where the error of every pixel is less than two). The experimental results show that the near-lossless compression method has better performance than JPEG-LS (lossless) with
= 2 for a Bayer format image.