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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 25, Issue 6 - Dec 2003
Volume 25, Issue 5 - Oct 2003
Volume 25, Issue 4 - Aug 2003
Volume 25, Issue 3 - Jun 2003
Volume 25, Issue 2 - Apr 2003
Volume 25, Issue 1 - Feb 2003
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High Performance RF Passive Integration on a Si Smart Substrate for Wireless Applications
Kim, Dong-Wook ; Jeong, In-Ho ; Lee, Jung-Soo ; Kwon, Young-Se ;
ETRI Journal, volume 25, issue 2, 2003, Pages 65~65
To achieve cost and size reductions, we developed a low cost manufacturing technology for RF substrates and a high performance passive process technology for RF integrated passive devices (IPDs). The fabricated substrate is a conventional 6" Si wafer with a 25
surface. This substrate showed a very good insertion loss of 0.03 dB/mm at 4 GHz, including the conductive metal loss, with a 50
coplanar transmission line (W=50
). Using benzo cyclo butene (BCB) interlayers and a 10
Cu plating process, we made high Q rectangular and circular spiral inductors on Si that had record maximum quality factors of more than 100. The fabricated inductor library showed a maximum quality factor range of 30-120, depending on geometrical parameters and inductance values of 0.35-35 nH. We also fabricated small RF IPDs on a thick oxide Si substrate for use in handheld phone applications, such as antenna switch modules or front end modules, and high-speed wireless LAN applications. The chip sizes of the wafer-level-packaged RF IPDs and wire-bondable RF IPDs were 1.0-1.5
, respectively. They showed very good insertion loss and RF performances. These substrate and passive process technologies will be widely utilized in hand-held RF modules and systems requiring low cost solutions and strict volumetric efficiencies.
Effective Silicon Oxide Formation on Silica-on-Silicon Platforms for Optical Hybrid Integration
Kim, Tae-Hong ; Sung, Hee-Kyung ; Choi, Ji-Won ; Yoon, Ki-Hyun ;
ETRI Journal, volume 25, issue 2, 2003, Pages 73~73
This paper describes an effective method for forming silicon oxide on silica-on-silicon platforms, which results in excellent characteristics for hybrid integration. Among the many processes involved in fabricating silica-on-silicon platforms with planar lightwave circuits (PLCs), the process for forming silicon oxide on an etched silicon substrate is very important for obtaining transparent silica film because it determines the compatibility at the interface between the silicon and the silica film. To investigate the effects of the formation process of the silicon oxide on the characteristics of the silica PLC platform, we compared two silicon oxide formation processes: thermal oxidation and plasma-enhanced chemical vapor deposition (PECVD). Thermal oxidation in fabricating silica platforms generates defects and a cristobalite crystal phase, which results in deterioration of the optical waveguide characteristics. On the other hand, a silica platform with the silicon oxide layer deposited by PECVD has a transparent planar optical waveguide because the crystal growth of the silica has been suppressed. We confirm that the PECVD method is an effective process for silicon oxide formation for a silica platform with excellent characteristics.
Vertical Coupling of Polymeric Double-Layered Waveguides Using a Stepped MMI Coupler
Lee, Jong-Moo ; Ahn, Joon-Tae ; Cho, Doo-Hee ; Ju, Jung-Jin ; Lee, Myung-Hyun ; Kim, Kyong-Hon ;
ETRI Journal, volume 25, issue 2, 2003, Pages 81~81
We designed a multimode interference (MMI) coupler to use in vertical coupling of double layered polymeric waveguides and analyzed the coupling characteristics by comparing our experimental and simulation results. We found that our proposed new structure, a stepped MMI coupler, is effective in vertical coupling between waveguide layers with a short length of MMI and has a high tolerance for the variation in the structure of an MMI coupler that can be induced as errors in the fabrication process.
Pseudorandomness of Basic Structures in the Block Cipher KASUMI
Kang, Ju-Sung ; Preneel, Bart ; Ryu, Heui-Su ; Chung, Kyo-Il ; Park, Chee-Hang ;
ETRI Journal, volume 25, issue 2, 2003, Pages 89~89
The notion of pseudorandomness is the theoretical foundation on which to consider the soundness of a basic structure used in some block ciphers. We examine the pseudorandomness of the block cipher KASUMI, which will be used in the next-generation cellular phones. First, we prove that the four-round unbalanced MISTY-type transformation is pseudorandom in order to illustrate the pseudorandomness of the inside round function FI of KASUMI under an adaptive distinguisher model. Second, we show that the three-round KASUMI-like structure is not pseudorandom but the four-round KASUMI-like structure is pseudorandom under a non-adaptive distinguisher model.
A Direction-Based Vascular Pattern Extraction Algorithm for Hand Vascular Pattern Verification
Im, Sang-Kyun ; Choi, Hwan-Soo ; Kim, Soo-Won ;
ETRI Journal, volume 25, issue 2, 2003, Pages 101~101
This paper proposes an improved vascular pattern extraction algorithm for person verification applications. The proposed direction-based vascular pattern extraction (DBVPE) algorithm is based on the directional information of vascular patterns. It applies two different filters to the input images: row vascular pattern extraction filter (RVPEF) for effective extraction of the abscissa vascular patterns and column vascular pattern extraction filter (CVPEF) for effective extraction of the ordinate vascular patterns. We use the combined output of both filters to obtain the final hand vascular patterns. Unlike the conventional hand vascular pattern extraction algorithm, the directional extraction approach prevents loss of the vascular pattern connectivity. To validate the DBVPE algorithm, we used a prototype system with a DSP processor. The prototype system shows approximately a three-times better false acceptance rate (FAR) than the conventional single filter algorithm.
Effective Reduction of Horizontal Error in Laser Scanning Information by Strip-Wise Least Squares Adjustments
Lee, Byoung-Kil ; Yu, Ki-Yun ; Pyeon, Moo-Wook ;
ETRI Journal, volume 25, issue 2, 2003, Pages 109~109
Though the airborne laser scanning (ALS) technique is becoming more popular in many applications, horizontal accuracy of points scanned by the ALS is not yet satisfactory when compared with the accuracy achieved for vertical positions. One of the major reasons is the drift that occurs in the inertial measurement unit (IMU) during the scanning. This paper presents an algorithm that adjusts for the error that is introduced mainly by the drift of the IMU that renders systematic differences between strips on the same area. For this, we set up an observation equation for strip-wise adjustments and completed it with tie point and control point coordinates derived from the scanned strips and information from aerial photos. To effectively capture the tie points, we developed a set of procedures that constructs a digital surface model (DSM) with breaklines and then performed feature-based matching on strips resulting in a set of reliable tie points. Solving the observation equations by the least squares method produced a set of affine transformation equations with 6 parameters that we used to transform the strips for adjusting the horizontal error. Experimental results after evaluation of the accuracy showed a root mean squared error (RMSE) of the adjusted strip points of 0.27 m, which is significant considering the RMSE before adjustment was 0.77 m.
A Method and Tool for Identifying Domain Components Using Object Usage Information
Lee, Woo-Jin ; Kwon, Oh-Cheon ; Kim, Min-Jung ; Shin, Gyu-Sang ;
ETRI Journal, volume 25, issue 2, 2003, Pages 121~121
To enhance the productivity of software development and accelerate time to market, software developers have recently paid more attention to a component-based development (CBD) approach due to the benefits of component reuse. Among CBD processes, the identification of reusable components is a key but difficult process. Currently, component identification depends mainly on the intuition and experience of domain experts. In addition, there are few systematic methods or tools for component identification that enable domain experts to identify reusable components. This paper presents a systematic method and its tool called a component identifier that identifies software components by using object-oriented domain information, namely, use case models, domain object models, and sequence diagrams. To illustrate our method, we use the component identifier to identify candidates of reusable components from the object-oriented domain models of a banking system. The component identifier enables domain experts to easily identify reusable components by assisting and automating identification processes in an earlier development phase.
Analysis and Optimization of Passive intermodulation in Microwave Coaxial Cavity Filters
Cho, In-Kui ; Kim, Jin-Tae ; Jeong, Myung-Yung ; Choy, Tae-Goo ; Kang, Young-Il ;
ETRI Journal, volume 25, issue 2, 2003, Pages 133~133
We studied how the passive intermodulation (PIM) power arising in air cavity filters could be calculated and how the design of the filter could be optimized in order to reduce the amplitude of the PIM signal. To do this, using simulated results, we optimized the various parameters of a filter. PIM in an air cavity filter depends on the power dissipated in its cavities. A reduction of this power loss therefore decreases the PIM power in the air cavity filter. Our experimental results confirm that it is possible to design and produce air cavity filters that generate low PIM signals.
A Probabilistic Network for Facial Feature Verification
Choi, Kyoung-Ho ; Yoo, Jae-Joon ; Hwang, Tae-Hyun ; Park, Jong-Hyun ; Lee, Jong-Hoon ;
ETRI Journal, volume 25, issue 2, 2003, Pages 140~140
In this paper, we present a probabilistic approach to determining whether extracted facial features from a video sequence are appropriate for creating a 3D face model. In our approach, the distance between two feature points selected from the MPEG-4 facial object is defined as a random variable for each node of a probability network. To avoid generating an unnatural or non-realistic 3D face model, automatically extracted 2D facial features from a video sequence are fed into the proposed probabilistic network before a corresponding 3D face model is built. Simulation results show that the proposed probabilistic network can be used as a quality control agent to verify the correctness of extracted facial features.
Serial Concatenation of Space-Time and Recursive Convolutional Codes
Ko, Young-Jo ; Kim, Jung-Im ;
ETRI Journal, volume 25, issue 2, 2003, Pages 144~144
We propose a new serial concatenation scheme for space-time and recursive convolutional codes, in which a space-time code is used as the outer code and a single recursive convolutional code as the inner code. We discuss previously proposed serial concatenation schemes employing multiple inner codes and compare them with the new one. The proposed method and the previous one with joint decoding, both performing a combined decoding of the simultaneous output signals from multiple antennas, give a large performance gain over the separate decoding method. In decoding complexity, the new concatenation scheme has a lower complexity compared with the multiple encoding/joint decoding scheme due to the use of the single inner code. Simulation results for a communication system with two transmit and one receive antennas in a quasi-static Rayleigh fading channel show that the proposed scheme outperforms the previous schemes.