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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 24, Issue 6 - Dec 2002
Volume 24, Issue 5 - Oct 2002
Volume 24, Issue 4 - Aug 2002
Volume 24, Issue 3 - Jun 2002
Volume 24, Issue 2 - Apr 2002
Volume 24, Issue 1 - Feb 2002
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Excimer and Aggregate Formations in Poly(fluorene)s
Lee, Jeong-Ik ; Lee, Victor Y. ; Miller, Robert D. ;
ETRI Journal, volume 24, issue 6, 2002, Pages 409~409
This paper investigates the absorption and emission changes in poly(di-n-hexylfluorene)s. We prepared the poly(di-n-hexylfluorene)s end capped with 2-bromofluorene, 2-bromo-9,9-di-n-hexylfluorene, and 9-bromoanthracene through Ni (0) mediated polymerization. In addition, we also synthesized a structurally distorted copolymer of 2,7-dibromo- 9,9-di-n-hexylfluorene and 9,9-bis(4-bromophenyl) fluorene end capped with 2-bromofluorene through the same polymerization method. The absorption and emission changes of these polymers between before and after thermal annealing in a nitrogen atmosphere clarify the role of aggregate/excimer formation in poly(fluorene)s. The large absorption changes must be attributed to aggregate formation (ground state interaction), which causes only a slight red shift of the vibronically structured emission bands. We assign the additional long wavelength emission as an excimer band (excited state interaction), which is preferably formed at chain ends.
A Satellite Radio Interface for IMT-2000
Lim, Kwang-Jae ; Choi, Kwon-Hue ; Kang, Kun-Seok ; Kim, Soo-Young ; Lee, Ho-Jin ;
ETRI Journal, volume 24, issue 6, 2002, Pages 415~415
This paper presents a new satellite radio interface, satellite code division multiple access (SAT-CDMA), for the satellite component of IMT-2000. The SAT-CDMA was proposed by Korea and was based on wideband CDMA (WCDMA) for a high degree of commonality with the terrestrial component of IMT-2000. Because a satellite link has a longer round trip delay and a higher Doppler shift than a terrestrial link, we developed new technologies that would make the satellite component especially efficient. We present the main features of the SAT-CDMA radio interface by focusing on satellite-specific schemes. We also demonstrate with extensive comparison results the performance of the main technologies in the SAT-CDMA radio interface.
Common-Mode Current on a Wire through a Corrugated Aperture
Park, Hyun-Ho ; Lee, Jae-Wook ; Kwon, Jong-Hwa ; Lee, Hyung-Soo ;
ETRI Journal, volume 24, issue 6, 2002, Pages 429~429
This paper investigates the effect of a corrugated aperture on a common-mode current traveling along a penetrating wire. Computational results illustrate that the corrugated aperture acts as a filter, significantly reducing the common-mode current on the wire. This effect causes a reduction of radiated emission from cables passing through apertures on shielding enclosures. To predict and analyze the characteristics of the common-mode current on a straight wire passing through a corrugated aperture with cylindrical symmetry, the finite-difference time-domain (FDTD) method is applied.
Effects of External PIM Sources on Antenna PIM Measurements
Kim, Jin-Tae ; Cho, In-Kui ; Jeong, Myung-Yung ; Choy, Tae-Goo ;
ETRI Journal, volume 24, issue 6, 2002, Pages 435~435
Antenna Passive Intermodulation (PIM) level measurement results are rarely credited to be due to external signal receiving characteristics of the antennas or serious effects from external PIM sources, such as the anechoic chamber absorber and antenna tower. This paper presents an antenna PIM model for a reflected PIM measurement method. Based on the findings of null point generation and the behavior of the third order PIM values obtained by theoretical predictions and experimental results, we concluded that the results of the antenna PIM level test were influenced by the external PIM sources generated by the anechoic chamber absorber and the path differences of PIM signals coming into the antenna.
A Soccer Image Sequence Mosaicking and Analysis Method Using Line and Advertisement Board Detection
Yoon, Ho-Sub ; Bae, Young-Lae J. ; Yang, Young-Kyu ;
ETRI Journal, volume 24, issue 6, 2002, Pages 443~443
This paper introduces a system for mosaicking sequences of soccer images in a panoramic view for soccer game analysis. The continuous mosaic images of the soccer ground field allow the user to view a wide picture of the players' actions. The initial component of our algorithm automatically detects and traces the players and some lines. The next component of our algorithm finds the parameters of the captured image coordinates and transforms them into ground model coordinates for automatic soccer game analysis. The results of our experimentations indicate that the proposed system offers a promising method for segmenting, mosaicking, and analyzing soccer image sequences.
Analysis of Schottky Barrier Height in Small Contacts Using a Thermionic-Field Emission Model
Jang, Moon-Gyu ; Lee, Jung-Hwan ;
ETRI Journal, volume 24, issue 6, 2002, Pages 455~455
This paper reports on estimating the Schottky barrier height of small contacts using a thermionic-field emission model. Our results indicate that the logarithmic plot of the current as a function of bias voltage across the Schottky diode gives a linear relationship, while the plot as a function of the total applied voltage across a metal-silicon contact gives a parabolic relationship. The Schottky barrier height is extracted from the slope of the linear line resulting from the logarithmic plot of current versus bias voltage across the Schottky diode. The result reveals that the barrier height decreases from 0.6 eV to 0.49 eV when the thickness of the barrier metal is increased from 500
. The extracted impurity concentration at the contact interface changes slightly with different Ti thicknesses with its maximum value at about
, which agrees well with the results from secondary ion mass spectroscopy (SIMS) measurements.
A Serial Input/Output Circuit with 8 bit and 16 bit Selection Modes
Yang, Yil-Suk ; Kim, Jong-Dae ; Roh, Tae-Moon ; Lee, Dae-Woo ; Koo, Jin-Gun ; Kim, Sang-Gi ; Park, Il-Yong ; Yu, Byoung-Gon ;
ETRI Journal, volume 24, issue 6, 2002, Pages 462~462
This paper presents a serial interface circuit that permits selection of the amount of data converted from serial-to-parallel and parallel-to-serial and overcomes the disadvantages of the conventional serial input/output interface. Based on the selected data length operating mode, 8 bit or 16 bit serial-to-parallel and 8 bit or 16 bit parallel-to-serial conversion takes place in data blocks of the selected data length.
Dynamic Bandwidth Allocation Algorithm for Multimedia Services over Ethernet PONs
Choi, Su-Il ; Huh, Jae-Doo ;
ETRI Journal, volume 24, issue 6, 2002, Pages 465~465
Ethernet passive optical networks (PONs) are an emerging access network technology that provides a low-cost method of deploying optical access lines between a carrier's central office and a customer site. In this paper, we propose a new algorithm of dynamic bandwidth allocation for multimedia services over Ethernet PONs. To implement the suggested dynamic bandwidth allocation algorithm, we present control message formats that handle classified bandwidths in a multi-point control protocol of Ethernet PONs.
Speaker Adaptation Using ICA-Based Feature Transformation
Jung, Ho-Young ; Park, Man-Soo ; Kim, Hoi-Rin ; Hahn, Min-Soo ;
ETRI Journal, volume 24, issue 6, 2002, Pages 469~469
Speaker adaptation techniques are generally used to reduce speaker differences in speech recognition. In this work, we focus on the features fitted to a linear regression-based speaker adaptation. These are obtained by feature transformation based on independent component analysis (ICA), and the feature transformation matrices are estimated from the training data and adaptation data. Since the adaptation data is not sufficient to reliably estimate the ICA-based feature transformation matrix, it is necessary to adjust the ICA-based feature transformation matrix estimated from a new speaker utterance. To cope with this problem, we propose a smoothing method through a linear interpolation between the speaker-independent (SI) feature transformation matrix and the speaker-dependent (SD) feature transformation matrix. From our experiments, we observed that the proposed method is more effective in the mismatched case. In the mismatched case, the adaptation performance is improved because the smoothed feature transformation matrix makes speaker adaptation using noisy speech more robust.
A Kernel-Based Partitioning Algorithm for Low-Power, Low-Area Overhead Circuit Design Using Don't-Care Sets
Choi, Ick-Sung ; Kim, Hyoung ; Lim, Shin-Il ; Hwang, Sun-Young ; Lee, Bhum-Cheol ; Kim, Bong-Tae ;
ETRI Journal, volume 24, issue 6, 2002, Pages 473~473
This letter proposes an efficient kernel-based partitioning algorithm for reducing area and power dissipation in combinational circuit designs using don't-care sets. The proposed algorithm decreases power dissipation by partitioning a given circuit using a kernel extracted from the logic. The proposed algorithm also reduces the area overhead by minimizing duplicated gates in the partitioned sub-circuits. The partitioned subcircuits are further optimized utilizing observability don't-care sets. Experimental results for the MCNC benchmarks show that the proposed algorithm synthesizes circuits that on the average consume 22.5% less power and have 12.7% less area than circuits generated by previous algorithms based on a precomputation scheme.