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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
Selecting the target year
Multi-Functional Dual-Layer Polymer Electrolytes for Lithium Metal Polymer Batteries
Lee, Young-Gi ; Ryu, Kwang-Sun ; Chang, Soon-Ho ;
ETRI Journal, volume 26, issue 4, 2004, Pages 285~285
We prepared a novel multi-functional dual-layer polymer electrolyte by impregnating the interconnected pores with an ethylene carbonate (EC)/dimethyl carbonate (DMC)/lithium hexafluorophosphate
solution. The first layer, based on a microporous polyethylene, is incompatible with a liquid electrolyte, and the second layer, based on poly (vinylidenefluoride-co-hexafluoropropylene), is submicroporous and compatible with an electrolyte solution. The maximum ionic conductivity is
at ambient temperature. A unit cell using the optimum polymer electrolyte showed a reversible capacity of 198 mAh/g at the 500th cycle, which was about 87% of the initial value.
Current-Mode Electronically Tunable Universal Filter Using Only Plus-Type Current Controlled Conveyors and Grounded Capacitors
Minaei, Shahram ; Turkoz, Sait ;
ETRI Journal, volume 26, issue 4, 2004, Pages 292~292
In this paper we present a new current-mode electronically tunable universal filter using only plus-type current controlled conveyors (CCCII+s) and grounded capacitors. The proposed circuit can simultaneously realize lowpass, bandpass, and highpass filter functions - all at high impedance outputs. The realization of a notch response does not require additional active elements. The circuit enjoys an independent current control of parameters
. No element matching conditions are imposed. Both its active and passive sensitivities are low.
A Plasma-Etching Process Modeling Via a Polynomial Neural Network
Kim, Dong-Won ; Kim, Byung-Whan ; Park, Gwi-Tae ;
ETRI Journal, volume 26, issue 4, 2004, Pages 297~297
A plasma is a collection of charged particles and on average is electrically neutral. In fabricating integrated circuits, plasma etching is a key means to transfer a photoresist pattern into an underlayer material. To construct a predictive model of plasma-etching processes, a polynomial neural network (PNN) is applied. This process was characterized by a full factorial experiment, and two attributes modeled are its etch rate and DC bias. According to the number of input variables and type of polynomials to each node, the prediction performance of the PNN was optimized. The various performances of the PNN in diverse environments were compared to three types of statistical regression models and the adaptive network fuzzy inference system (ANFIS). As the demonstrated high-prediction ability in the simulation results shows, the PNN is efficient and much more accurate from the point of view of approximation and prediction abilities.
Application of GaAs Discrete p-HEMTs in Low Cost Phase Shifters and QPSK Modulators
Kamenopolsky, Stanimir D. ;
ETRI Journal, volume 26, issue 4, 2004, Pages 307~307
The application of a discrete pseudomorphic high electron mobility transistor (p-HEMT) as a grounded switch allows for the development of low cost phase shifters and phase modulators operating in a Ku band. This fills the gap in the development of phase control devices comprising p-i-n diodes and microwave monolithic integrated circuits (MMICs). This paper describes a discrete p-HEMT characterization and modeling in switching mode as well as the development of a low-cost four-bit phase shifter and direct quadrature phase shift keying (QPSK) modulator. The developed devices operate in a Ku band with parameters comparable to commercially available MMIC counterparts. Both of them are CMOS compatible and have no power consumption. The parameters of the QPSK modulator are very close to the requirements of available standards for satellite earth stations.
Characterization of an Oxidized Porous Silicon Layer by Complex Process Using RTO and the Fabrication of CPW-Type Stubs on an OPSL for RF Application
Park, Jeong-Yong ; Lee, Jong-Hyun ;
ETRI Journal, volume 26, issue 4, 2004, Pages 315~315
This paper proposes a 10-
thick oxide layer structure that can be used as a substrate for RF circuits. The structure has been fabricated using an anodic reaction and complex oxidation, which is a combined process of low-temperature thermal oxidation (500
for 1 hr at
) and a rapid thermal oxidation (RTO) process (1050
, for 1 min). The electrical characteristics of the oxidized porous silicon layer (OPSL) were almost the same as those of standard thermal silicon dioxide. The leakage current density through the OPSL of 10
was about 10 to 50
in the range of 0 to 50 V. The average value of the breakdown field was about 3.9 MV/cm. From the X-ray photo-electron spectroscopy (XPS) analysis, surface and internal oxide films of OPSL prepared by a complex process were confirmed to be completely oxidized. The role of the RTO process was also important for the densification of the porous silicon layer (PSL) oxidized at a lower temperature. The measured working frequency of the coplanar waveguide (CPW) type short stub on an OPSL prepared by the complex oxidation process was 27.5 GHz, and the return loss was 4.2 dB, similar to that of the CPW-type short stub on an OPSL prepared at a temperature of 1050
(1 hr at
). Also, the measured working frequency of the CPW-type open stub on an OPSL prepared by the complex oxidation process was 30.5 GHz, and the return was 15 dB at midband, similar to that of the CPW-type open stub on an OPSL prepared at a temperature of
(1 hr at
Hierarchical Dynamic Bandwidth Allocation Algorithm for Multimedia Services over Ethernet PONs
Ahn, Kye-Hyun ; Han, Kyeong-Eun ; Kim, Young-Chon ;
ETRI Journal, volume 26, issue 4, 2004, Pages 321~321
In this paper, we propose a new dynamic bandwidth allocation (DBA) algorithm for multimedia services over Ethernet PONs (passive optical networks). The proposed algorithm is composed of a low-level scheduler in the optical network unit (ONU) and a high-level scheduler in the optical line terminal (OLT). The hierarchical DBA algorithm can provide expansibility and efficient resource allocation in an Ethernet PON system in which the packet scheduler is separated from the queues. In the proposed DBA algorithm, the OLT allocates bandwidth to the ONUs in proportion to the weight associated with their class and queue length, while the ONU preferentially allocates its bandwidth to queues with a static priority order. The proposed algorithm provides an efficient resource utilization by reducing the unused remaining bandwidth caused by the variable length of the packets. We also define the service classes and present control message formats conforming to the multi-point control protocol (MPCP) over an Ethernet PON. In order to evaluate the performance, we designed an Ethernet PON system on the basis of IEEE 802.3ah "Ethernet in the first mile" (EFM) using OPNET and carried out simulations. The results are analyzed in terms of the channel utilization, queuing delay, and ratio of the unused remaining bandwidth.
Adaptive Scanning Method for Fine Granularity Scalable Video Coding
Park, Gwang-Hoon ; Kim, Kyu-Heon ;
ETRI Journal, volume 26, issue 4, 2004, Pages 332~332
One of the recent and most significant technical properties can be expressed as "digital convergence," which is helping lead the technical paradigm into a ubiquitous environment. As an initial trial of realizing a ubiquitous environment, the convergence between broadcasting and telecommunication fields is now on the way, where it is required to develop a scalable video coding scheme for one-source and multi-use media. Traditional scalable video coding schemes have, however, limitations for higher stable picture quality especially on the region of interest. Therefore, this paper introduces an adaptive scanning method especially designed for a higher regional-stable picture quality under a ubiquitous video coding environment, which can improve the subjective quality of the decoded video by most-preferentially encoding, transmitting, and decoding the top-priority image information of the region of interest. Thus, the video can be more clearly visible to users. From various simulation results, the proposed scanning method in this paper can achieve an improved subjective picture quality far better than the widely used raster scan order in conventional video coding schemes, especially on the region of interest, and without a significant loss of quality in the left-over region.
Filter-Free Wavelength Conversion Using Mach-Zehnder Interferometer with Integrated Multimode Interference Semiconductor Optical Amplifiers
Kim, Jong-Hoi ; Kim, Hyun-Soo ; Sim, Eun-Deok ; Kim, Kang-Ho ; Kwon, Oh-Kee ; Oh, Kwang-Ryong ;
ETRI Journal, volume 26, issue 4, 2004, Pages 344~344
We propose a filter-free wavelength conversion using a Mach-Zehnder interferometer with monolithically integrated
multimode interference semiconductor optical amplifiers (MMI-SOAs). The device has been optimized by considering a non-homogeneous carrier distribution due to the self-imaging properties of the MMI-SOA. Static measurements show an extinction ratio of up to 18 dB and an input signal rejection ratio of up to 20 dB.
Flow Aggregation of Rate Controlled Round-Robin Scheduler
Kim, Ki-Cheon ;
ETRI Journal, volume 26, issue 4, 2004, Pages 351~351
Flow aggregation is a scalable method to provide quality of service (QoS) guarantees to a large number of flows economically. A round-robin scheduler is an efficient scheduling algorithm. We investigate flow aggregation using a round-robin scheduler and propose the use of periodic timer interrupts for rate control of the round-robin scheduler. The proposed flow aggregator is a single-stage scheduler compared to Cobb's two-stage flow aggregator consisting of an aggregator and non-aggregating scheduler. It is possible to implement flow aggregation in the existing routers with only a software upgrade. We also present a simulation study showing the delay behaviors of the proposed algorithm.
Performance Analysis of SyncML Server System Using Stochastic Petri Nets
Lee, Byung-Yun ; Lee, Gil-Haeng ; Choi, Hoon ;
ETRI Journal, volume 26, issue 4, 2004, Pages 360~360
Synchronization Markup Language (SyncML) is a specification of a common data synchronization framework for synchronizing data on networked devices. SyncML is designed for use between mobile devices that are intermittently connected to a network and network services that are continuously available on the network. We have designed and developed a data synchronization system based on the SyncML protocol and evaluated the throughput of the system using the stochastic Petri nets package (SPNP) and analyzed the relationship between the arrival rate and the system resources. Using this model, we evaluate various performance measures in different situations, and we estimate the relationship between the arrival rate and the system resources. From the results, we can estimate the optimal amount of resources due to the arrival rate before deploying the developed system.
Design and Implementation of the Ensemble Remultiplexer for DMB Service Based on Eureka-147
Bae, Byung-Jun ; Yun, Joung-Il ; Cho, Sam-Mo ; Hahm, Young-Kwon ; Lee, Soo-In ; Sohng, Kyu-Ik ;
ETRI Journal, volume 26, issue 4, 2004, Pages 367~367
A new transmission system is necessary for the Digital Multimedia Broadcasting (DMB) service in Korea. Therefore, in this paper, we propose a new architecture for the implementation of a DMB transmission system based on Eureka-147. We describe the design and implementation of the Ensemble remultiplexer, which is essential to the proposed system for remultiplexing ETI frames and MPEG-2 transport streams. The proposed system provides a solution with high flexibility and low cost for multimedia broadcasting service. The functions of this transmission system have been verified by using our DMB receiver and other related systems.
Fabrication and Analysis of Chirped Fiber Bragg Gratings by Thermal Diffusion
Cho, Seung-Hyun ; Park, Jae-Dong ; Kim, Byoung-Whi ; Kang, Min-Ho ;
ETRI Journal, volume 26, issue 4, 2004, Pages 371~371
We propose and demonstrate a fabrication method of chirped fiber gratings by a thermal diffusion process. The method could suggest a direction for a simple and cost-effective implementation of chirped fiber grating-based devices.