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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
The Journal of Korean Institute of Communications and Information Sciences
Journal Basic Information
Journal DOI :
The Korean Institute of Communications and Information Sciences
Editor in Chief :
Kyung-Hi Chang / Song Chong / Jong-Taek Oh / Jae-Jin Lee / Myung-Sik Yoo
Volume & Issues
Volume 17, Issue 12 - Dec 1992
Volume 17, Issue 11 - Nov 1992
Volume 17, Issue 10 - Oct 1992
Volume 17, Issue 9 - Sep 1992
Volume 17, Issue 8 - Aug 1992
Volume 17, Issue 7 - Jul 1992
Volume 17, Issue 6 - Jun 1992
Volume 17, Issue 5 - May 1992
Volume 17, Issue 4 - Apr 1992
Volume 17, Issue 3 - Mar 1992
Volume 17, Issue 2 - Feb 1992
Volume 17, Issue 1 - Jan 1992
Selecting the target year
Design of Continuous-Time OTA-C Elliptic Filter for CMOS VLSI
The Journal of Korean Institute of Communications and Information Sciences, volume 17, issue 10, 1992, Pages 1051~1062
Design of a continuous-time fifth-order OTA-C Eiliptic filter for operation at 4MHz is presented. The filter has been realize by five OTAs, eight capacitors and a buffer as an OTA-C structure. To prevent decreasing of characteristics due to the parastic capacitance of OTA and loading a buffer and a capacitor have been connected to the next of second section. As the result the frequency characteristics were found to be essentially within specifications : less than 0.2dB passband attenuation, 30dB stopband attenuation and 4Mz cut-off frequency have been obtained and the characteristic of cut-off region has been improved about 7dB compared with it of the theoretical case.
A Study on Design Schemes of Extracting Control Signals for a CD-G System
The Journal of Korean Institute of Communications and Information Sciences, volume 17, issue 10, 1992, Pages 1063~1073
This paper deals with a method for extracting picture signals from CD graphics with a conventional CD player, schemes for designing circuits for the effective extraction of control signals, and the implementation of such circuits using commercially available logic components, thereby achieving cost-effectiveness. This paper also presents an implementation and evaluation of the CD-G system, which requires extracting picture signals, deinterleaving the extracted signals and analyzing control commands and displaying them on a screen. The CD-G system implemented using the extraction circuit presented herein has been observed to operate well in real time.
Design and Analysis of a Memoryless Minimum Bandwidth Birnary Line Code MB58
The Journal of Korean Institute of Communications and Information Sciences, volume 17, issue 10, 1992, Pages 1074~1080
A(5,8) block binary line code is proposed. The new line code called MB58 has the properties of being dc-free and runlength-limited, and it is strictly bandwidth-limited to the Nyquist frequency, such that bandwidth efficiency is improved. This new code is a memoryless code with a simple decoding rule and capability of error monitoring. The power spectrum and the eye pattern of the new code are obtained by simulation, wherein spectral nulls at DC(f=0) and Nyquist frequency (f=1/2Ts) are clearly identified.
Structures and Characteristics of the WDF Using VGIC for VLSI Implementation
The Journal of Korean Institute of Communications and Information Sciences, volume 17, issue 10, 1992, Pages 1081~1091
A new method for designing of WDF(Wave Digital Filter) is proposed, which is based on the digital dependent port adaptor transformed by the VGIC(Voltage Conversion Generalized Impedance Converter). To design the WD-LPF, WD-BPF, WD-HPF, or WD-BRF with CGIC(Current Conversion GIC). we have to use the different structure respectively. But the proposed method to design any types of WDF requires only one universal WDF structure, and this structure is attractive for its VLSI implementation for its simplicity.
Fiber-Optic Accelerometer by Mach-Zehnder Interferometer
The Journal of Korean Institute of Communications and Information Sciences, volume 17, issue 10, 1992, Pages 1092~1099
In this paper, a sensitivity of the gravity acceleration
for a fiber-optic accelerometer is demonstrated. A single mode optical fiber Mach-Zehnder interferometer was used to detect the change in optical path length produced by the strain in the fiber from probe mass about 1 gram. The phase conversion gain of the piezoelectric cylinder in the reference arm with this system measures 0.88rad./v.
Trumpis Coded FH/MFSK Performance in Noise Jamming Environments
The Journal of Korean Institute of Communications and Information Sciences, volume 17, issue 10, 1992, Pages 1100~1108
The evaluation of coded error probabilities for antijam communication systems is usually difficult to do and, thus, easy-to-evaluate upper bounds are used. Since it is relatively easy to evaluate the cutoff rate for the coding channel, the coded bit error bounds for most antijam systems of interest can be easily expressed directly in terms of this cutoff rate parameter using the relationship between the bit error bounds and cutoff rate for AWGN channel. The key feature of these bounds is the decoupling of the coding aspects of the system from the remaining part of the communication system which includes jamming, suboptimum detectors, and arbitrary decoding metrics which may or may not use jammer state knowledge. In this paper the bit error bounds for the Trumpis coded FH/MFSK with an AWGN channel are translated into the corresponding bit error bounds for boradband and partial band noise jammer. And the impact of the side information about jammer state is also evaluated with these upper bounds. Although it is considered for the soft decision detector, it is also applicable to the hard decision detector.
Design of Morphological Filter for Image Processing
The Journal of Korean Institute of Communications and Information Sciences, volume 17, issue 10, 1992, Pages 1109~1116
Mathematical morphology, theoretical foundation for morphological filter, is very efficient for the analysis of the geometrical characteristics of signals and systems and is used as a predominant tool for smoothing the data with noise. In this study, H/W design of morphological filter is implemented to process the gray scale dilation and the erosion in the same circuit and to choose the maximum and minimum value by a selector, resulting in their education of the complexity of the circuit and an architecture for parallel processing. The structure of morphological filter consists of the structuring-element block, the image data block, the control block, the ADD block, the MIN/MAX block, etc, and is designed on an one-chip for real time operation.
A Study on the Ordered Multicast Protocols with Flow Control
The Journal of Korean Institute of Communications and Information Sciences, volume 17, issue 10, 1992, Pages 1117~1130
In this study, we propose a protocol for the communication between process groups required during message transfers. This is accomplished by an efficient process management of distributed systems connected by computer networks. For a single process group, a multicast protocol was proposed, which can control message flows while maintaining the order of messages sent or delivered. Through use of membership-related services, a member composing a process group may leave and join the current a membership anytime during execution. Moreover, message delivery can be delayed by using a logical vector time stamp. The functionality of the message delivery includes a virtual synchronization in response to a change in membership.
The Block Segmentation and Extraction of Layout Information In Document
The Journal of Korean Institute of Communications and Information Sciences, volume 17, issue 10, 1992, Pages 1131~1146
In this paper, we suggest a new algorithm applied to the segmentation of published documents to obtain constituent and layout information of document. Firstly, we begin the process of blocking and labeling on a 300dpi scanned document. Secondly, we classify the blocked document by individual sub-regions. Thirdly, we group sub-regions into graphic areas and text areas. Finally, we extract information for layout recognition by using the data. From an experiment on papers of an academic society, we obtain the above 98% of region classification rate and extraction rate of information for the layout recognition.
/4 shift QPSK with Trellis-Code and Lth Phase Different Metrics
The Journal of Korean Institute of Communications and Information Sciences, volume 17, issue 10, 1992, Pages 1147~1156
In this paper, in order to apply the
shift QPSK to TCM, we propose the
shift 8PSK modulation technique and the trellis-coded
shift 8PSK performing signal set expansion and partition by phase difference. In addition, the Viterbi decoder with branch metrics of the squared Euclidean distance of the first phase difference as well as the Lth phase different is introduced in order to improve the bit error rate(BER) performance in differential detection of the trellis-coded
shift 8PSK. The proposed Viterbi decoder is conceptually the same as the sliding multiple detection by using the branch metric with first and Lth order phase difference. We investigate the performance of the uncoded
shift QPSK and the trellis-coded
shift 8PSK with or without the Lth phase difference metric in an additive white Gaussian noise (AWGN) using the Monte Carlo simulation. The study shows that the
shift QPSK with the Trellis-code i.e. the trellis-coded
shift 8PSK is an attractive scheme for power and bandlimited systems and especially, the Viterbi decoder with first and Lth phase difference metrics improves BER performance. Also, the nest proposed algorithm can be used in the TC
shift 8PSK as well as TCMDPSK.
Design of a Direct Adaptive Pole Placement Controller Without Persistency of Excitation
The Journal of Korean Institute of Communications and Information Sciences, volume 17, issue 10, 1992, Pages 1157~1163
The development of adaptive control algorithms for possibly nonminimum phase systems has been hampered by singularities that may arise in the control law. To solve this problem, one securing convergence of the estimates to their true values by inducing persistency of excitation in the plant signals using direct adaptive control method and indirect adaptive control method, and another in which the estimates are adequately modified to meet the controllability requirements using indirect adaptive control method, without persistency of excitation. This paper presents an adaptive scheme that achieves regulation without persistent excitation condition using direct adaptive control method and reduces estimation algorithms with direct estimation of controller parameters without estimation of plant parameters.
A Study on the Information Security Protocol in LLC/MAC Layer Architecture
The Journal of Korean Institute of Communications and Information Sciences, volume 17, issue 10, 1992, Pages 1164~1174
In this paper, an Information Security protocol in LLC/MAC Layer Architecture is discussed. This paper examines the security Vulnerability and threats, the security Service required to protect these threats, and architectural considerations of security protocol in IEEE 802 LAN architecture. To provide an Information security service, an information security protocol(SP2 : Security Protocol 2) PDU construction with LLC/MAC service primitives is suggested. To construct the SP2 protocol, the ECB, CBC mode of DES algorithm and DAA(Data Authentication Algorithm) of FIPS is used. The SP2 protocol suggested in this paper provides data origin authentication, data confidentiality, data integrity service.