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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 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
A One-Kilobit PQR-CMOS Smart Pixel Array
Lim, Kwon-Seob ; Kim, Jung-Yeon ; Kim, Sang-Kyeom ; Park, Byeong-Hoon ; Kwon, O'Dae ;
ETRI Journal, volume 26, issue 1, 2004, Pages 1~1
The photonic quantum ring (PQR) laser is a three dimensional whispering gallery (WG) mode laser and has anomalous quantum wire properties, such as microampere to nanoampere range threshold currents and
-dependent thermal red shifts. We observed uniform bottom emissions from a 1-kb smart pixel chip of a
InGaAs PQR laser array flip-chip bonded to a 0.35
CMOS-based PQR laser driver. The PQR-CMOS smart pixel array, now operating at 30 MHz, will be improved to the GHz frequency range through device and circuit optimization.
A New SOI LDMOSFET Structure with a Trench in the Drift Region for a PDP Scan Driver IC
Son, Won-So ; Kim, Sang-Gi ; Sohn, Young-Ho ; Choi, Sie-Young ;
ETRI Journal, volume 26, issue 1, 2004, Pages 7~7
To improve the characteristics of breakdown voltage and specific on-resistance, we propose a new structure for a LDMOSFET for a PDP scan driver IC based on silicon-on-insulator with a trench under the gate in the drift region. The trench reduces the electric field at the silicon surface under the gate edge in the drift region when the concentration of the drift region is high, and thereby increases the breakdown voltage and reduces the specific on-resistance. The breakdown voltage and the specific on-resistance of the fabricated device is 352 V and
with a threshold voltage of 1.0 V. The breakdown voltage of the device in the on-state is over 200 V and the saturation current at
=20V is 16 mA with a gate width of
An OCDMA Scheme to Reduce Multiple Access Interference and Enhance Performance for Optical Subscriber Access Networks
Park, Sang-Jo ; Kim, Bong-Kyu ; Kim, Byoung-Whi ;
ETRI Journal, volume 26, issue 1, 2004, Pages 13~13
We propose a new optical code division multiple access (OCDMA) scheme for reducing multiple access interference (MAI) and enhancing performance for optical subscriber access networks using modified pseudorandom noise (PN)-coded fiber Bragg gratings with bipolar OCDMA decoders. Through the bipolar OCDMA decoder and the modified PN codes, MAI among users is effectively depressed. As the data are encoded either by a unipolar signature sequence of the modified PN code or its complement according to whether the data bit is 1 or 0, the bit error ratio (BER) can be more improved with the same signal to interference plus noise ratio over the conventional on-off shift keying-based OCDMA system. We prove by numerical analysis that the BER of the proposed bipolar OCDMA system is better than the conventional unipolar OCDMA system. We also analyze the spectral power distortion effects of the broadband light source.
A Viterbi Decoder with Efficient Memory Management
Lee, Chan-Ho ;
ETRI Journal, volume 26, issue 1, 2004, Pages 21~21
This paper proposes a new architecture for a Viterbi decoder with an efficient memory management scheme. The trace-back operation is eliminated in the architecture and the memory storing intermediate decision information can be removed. The elimination of the trace-back operation also reduces the number of operation cycles needed to determine decision bits. The memory size of the proposed scheme is reduced to 1/(
constraint length) of that of the register exchange scheme, and the throughput is increased up to twice that of the trace-back scheme. A Viterbi decoder complying with the IS-95 reverse link specification is designed to verify the proposed architecture. The decoder has a code rate of 1/3, a constraint length of 9, and a trace-forward depth of 45.
Scalable Quasi-Dynamic-Provisioning-Based Admission Control Mechanism in Differentiated Service Networks
Rhee, Woo-Seop ; Lee, Jun-Hwa ; Yu, Jae-Hoon ; Kim, Sang-Ha ;
ETRI Journal, volume 26, issue 1, 2004, Pages 27~27
The architecture in a differentiated services (DiffServ) network is based on a simple model that applies a per-class service in the core node of the network. However, because the network behavior is simple, the network structure and provisioning is complicated. If a service provider wants dynamic provisioning or a better bandwidth guarantee, the differentiated services network must use a signaling protocol with QoS parameters or an admission control method. Unfortunately, these methods increase the complexity. To overcome the problems with complexity, we investigated scalable dynamic provisioning for admission control in DiffServ networks. We propose a new scalable
mechanism based on a centralized bandwidth broker and distributed measurement-based admission control and movable boundary bandwidth management to support heterogeneous QoS requirements in DiffServ networks.
Chemical Lithography by Surface-Induced Photoreaction of Nitro Compounds
Han, Sang-Woo ; Lee, In-Hyung ; Kim, Kwan ;
ETRI Journal, volume 26, issue 1, 2004, Pages 38~38
Searching for systems of self-assembled monolayers (SAMs) that can be used as templates for chemical lithography, we found that nitro groups on aromatic SAMs are selectively converted on Ag to amino groups by irradiation with a visible laser. 4-nitrobenzenethiol on Ag was thus converted to 4-aminobenzenethiol by irradiating it with an
laser. This was evident from surface-enhanced Raman scattering (SERS) as well as from a coupling reaction forming amide bonds. The surface-induced photoreaction allowed us to prepare patterned binary monolayers on Ag that showed different chemical reactivities. Using the binary monolayers as a lithographic template, we induced site-specific chemical reactions, such as the selective growth of biominerals on either the nitro- or amine-terminated regions by adjusting the crystal-growth conditions. We also demonstrated that patterned, amine-terminated monolayers can be fabricated even on gold by using silver nanoparticles as photoreducing catalysts.
Spatially Close Signals Separation via Array Aperture Expansions and Spatial Spectrum Averaging
Kang, Heung-Yong ; Kim, Young-Su ; Kim, Chang-Joo ;
ETRI Journal, volume 26, issue 1, 2004, Pages 45~45
A resolution enhancement method for estimating the direction-of-arrival (DOA) of signals is presented. The proposed method is by virtually expanding a real array into virtual arrays and then averaging the spatial spectrum of the virtual arrays, each of which has a different aperture size. Superior DOA resolutions are shown in comparison with the standard algorithm, MUltiple SIgnal Classification (MUSIC), for incoherent signals incident on a uniform circular array.
Packet Scheduling Algorithm Considering a Minimum Bit Rate for Non-realtime Traffic in an OFDMA/FDD-Based Mobile Internet Access System
Kim, Dong-Hoi ; Ryu, Byung-Han ; Kang, Chung-Gu ;
ETRI Journal, volume 26, issue 1, 2004, Pages 48~48
In this letter, we consider a new packet scheduling algorithm for an orthogonal frequency division multiplexing access/frequency division duplex (OFDMA/FDD)-based system, e.g., mobile broadband wireless access or high-speed portable internet systems, in which the radio resources of both time and frequency slots are dynamically shared by all users under a proper scheduling policy. Our design objective is to increase the number of non-realtime service (e.g., WWW) users that can be supported in the system, especially when the minimum bit rate requirement is imposed on them. The simulation results show that our proposed algorithm can provide a significant improvement in the average outage probability performance for the NRT service, i.e., significantly increasing the number of NRT users without much compromising of the cell throughput.
Design of Scannable Non-uniform Planar Array Structure for Maximum Side-Lobe Reduction
Bae, Ji-Hoon ; Kim, Kyung-Tae ; Pyo, Cheol-Sig ; Chae, Jong-Suk ;
ETRI Journal, volume 26, issue 1, 2004, Pages 53~53
In this letter, we propose a novel design scheme for an optimal non-uniform planar array geometry in view of maximum side-lobe reduction. This is implemented by a thinned array using a genetic algorithm. We show that the proposed method can maintain a low side-lobe level without pattern distortion during beam steering.
Surface-Mountable 10 Gbps Photoreceiver Module Using Inductive Compensation Method
Kim, Sung-Il ; Hong, Seon-Eui ; Lim, Jong-Won ; Moon, Jong-Tae ;
ETRI Journal, volume 26, issue 1, 2004, Pages 57~57
We propose an inductive compensation method for a surface-mountable 10 Gbps photoreceiver module. Since many typical 10 Gbps photoreceiver modules consist of a photodetector and low-noise pre-amplifier, the impedance mismatch between the photodetector and pre-amplifier, as well as package parasitics, may reduce the frequency bandwidth. In this paper, we inserted an inductive component between the photodetector and pre-amplifier in order to create frequency bandwidth expansion. From the measurement results, we have found that the proposed technique can increase the -3 dB bandwidth about 4.2 GHz wider compared with an uncompensated module. And, from a bit-error rate (BER) test, we observed -15.7 dB sensitivity at
BER. This inductive compensation can be implemented easily and is compatible with common manufacturing processes of photoreceiver modules.
Fabrication and Characteristics of an InP Single HBT and Waveguide PD on Double Stacked Layers for an OEMMIC
Kim, Hong-Seung ; Kim, Hye-Jin ; Hong, Sun-Eui ; Jung, Dong-Yun ; Nam, Eun-Soo ;
ETRI Journal, volume 26, issue 1, 2004, Pages 61~61
We have explored the fabrication of an InP/InGaAs single heterojunction bipolar transistor (HBT) and a wave guide p-i-n photodiode (PD) on two kinds of double stacked layers for the implementation of an optoelectronic millimeter-wave monolithic integrated circuit (OEMMIC). We applied a photosensitive polyimide for passivation and integration to overcome the large difference between the HBT and PD layers of around
. Our experiment showed that the RF characteristics of the HBT were dependent on the location of the PD layer, while the dc performances of the HBTs and PDs were independent of the type of stacked layer used. The
of the HBTs on the HBT/PD stacked layer were 10% lower than those of the HBTs on the PD/HBT stacked layer.