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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korea Institute of Information and Communication Engineering
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Journal DOI :
The Korean Institute of Information and Commucation Engineering
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Volume & Issues
Volume 3, Issue 4 - Dec 1999
Volume 3, Issue 3 - Sep 1999
Volume 3, Issue 2 - Jun 1999
Volume 3, Issue 1 - Mar 1999
Selecting the target year
A study on the new Developmental Direction for Fisheries Policy in Korea
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 695~704
This paper presents the new developmental direction for fisheries policy in Korea. Korea is changing strang fisheries nation, the fact is that korea cannot effectively cope with changing fisheries situation and various fisheries difficulties, because the fisheries policy system is dispersed to each parts of the government. The results of this study is as follow: the fisheries policy in future must be able to unify of Ministry of Maritime Affairs and Fisheries, all fisheries offices must be able to relation, the regulation of fisheries policy must relieve, a coastal fishery must be able to reproduction, change of fishery structure must be able to raising fishery, consumption of fishery must be able to improvement, live of fishing village must be able to betterment, overseas fishing grounds must have to security.
A Study on the Implementation for Marine Administration Information System - in case of Pusan -
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 705~714
Modem society is an information society. This study analyzed the present state of marine information system and the analytical framework showing the study about if it is possible to construct marine information network and marine information system service. The results of this study is as follow: First, developing and complete stage, marine informations organization must be constructed. Second, the marine information policy in future must be able to unify all the areas. Third, the marine information system in future must be able to unify all the information systems. fourth, marine information systems must consist of marine-travel area, fisheries area, marine industry area, port area.
Development of telecommunications System for Aged Welfare Policy
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 715~722
This paper was studied on developmental direction of Telecommunications system for aged welfare policy. The results of this study is as follow: An economic needs must development of home shopping system, home banking system and telecommuting system. A medical needs must development of medical support system, medical information system and telemedical support system. A house needs must development of home automatic system, internet system. A culture needs must development of event system, leisure information system. A traffic needs must development of automatic traffic geographical system, automatic operating system. An education needs must development of teleeducation system, knowledge studying support system.
Implementation and Analysis of Optimizers on Tuple codes
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 723~736
Code optimization phase in a compiler are very important because the phase reduces the running time and the storage size of machine codes. I developed flow analyzers and optimizers on intermediate codes. The flow analyzers generate control-flow and data-flow information. The optimizers transform the intermediate codes into the improved codes using this information. This paper describes the development of flow analyzers and optimizers. I also examined the execution performance, the cost and the dependency of each optimization.
Design of Arithmetic processor with multiple valued BCH code
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 737~745
In this paper, we present encoders and decoders with the two kinds of ternary Bose-Chaudhuri-Hocquenghem(BCH) codes in the most basic ternary code system from among multiple-valued code systems. One is the random-triple-error-correcting ternary BCH(26,14) code for sequential data, the other is random-triple -error-correcting ternary BCH (26,13) code. The encoders and the decoders realized are verified by experiment. Amount of the (26,13) decoder's hardware is about 50% of the one of the (26,14) decoder's one.
Network Management Architecture using Mobile Agent technology
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 747~754
Mobile Agent is a movable software program that autonomously runs on behalf of its operator in a network environment. It has been widely applied to various kinds of computer engineering. In this paper, a network management architecture using the mobile agent technology in the distributed network environment is proposed. After manager system creates the mobile agent, it searches a proxy, a distributed object that acts as the substitute for a SNMP agent. In order to get the management information that manager requires, the mobile agent goes to the proxy and does operations on it. So, only the concise results from the operation are sent to the managing system. The proposed architecture is based on CORBA that provides several transparent characteristics in the distributed environment. In additional, the proxy object that represents the SNMP agent enables the mobile agent and the SNMP agent to converse with themselves. In this architecture, the mobile agent can carry out an automated management function, easily change and modify management functions. Therefore, it can provide an efficient management way.
System Level Simulation of CDMA Network with Adaptive Array
Chung, Yeong-Jee ; Lee, Jae-Woo ;
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 755~764
In this study, the system level network simulation is considered with adaptive array antenna in CDMA mobile communication system. A network simulation framework is implemented based on IS-95A/B system to consider dynamic handoff, system level network behavior, and deploying strategy into the overall CDMA mobile communication network under adaptive array algorithm. Its simulation model, such as vector channel model, adaptive beam forming antenna model, handoff model, and power control model, are described in detail with simulation block. In order to maximize SINR of received signal at antenna, maximin algorithm is particularly considered, and it is computed at each simulation snap shot with SINR based power control and handoff algorithm. Graphic user interface in this system level network simulator is also implemented to define the simulation environments and to represent simulation results on real mapping system. This paper also shows some features of simulation framework and simulation results.
Performance Evaluation of Reverse Link Power Control in CDMA System
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 765~778
Analysis of Rain Effect on the Satellite Signal in Changwon-Masan('88~'97)
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 779~785
The satellite signals have attenuation when Satellite path have rain. The signal attenuation by rain is effected over 100Hz and higher frequency signal have very serious attenuation. The rain attenuation is due mostly to rain rate and rain rate data over 10 years need to estimate characteristics of distribution of ram rate. In this paper, We have obtained the rain characteristics from on the recent data(1988-1997) for Changwon-Masan approximated with Moupfouma New Model, and then estimated the rain attenuation using ITU-R, Global and SAM methods, and finally, Effect of rain was analyzed.
Design of 32-bit Carry Lookahead Adder Using ENMODL
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 787~794
This paper presents an ENMODL(enhances NORA MODL) circuit and implements a high-speed 32 bit CLA(carry lookahead adder) with the new dynamic logics. The proposed logic can reduce the area and the Propagation delay of carry because output inverters and a clocking PMOS of second stage can be omitted in two-stage MODL(multiple output domino logic) circuits. The 32-bit CLA is implemented with 0.8um double metal CMOS Process and the carry propagation delay of the adder is about 3.9 nS. The ENMODL circuits can improve the performance in the high-speed computing circuits depending on the degree of recurrence.
BER Performance of DS/CDMA-BPSK Systemin 3-State Land Mobile Satellite fading Channel
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 795~804
The increasing number of users of mobile communication systems and the corresponding need for increased system capacity require the use of a modulation scheme which is both power and spectrally efficient. In this paper, we numerically calculate the BER performance of DS/CDMA-BPSK system in different fading channel (Rayleigh, Rician, Shadow Rician). Also, we calculate BER performance and the channel capacity of DS/CDMA-BPSK system which is constant or nearly constant envelopes in 3-state fading channel model. The Shadow Rician fading model described in this paper apply the parameters of the Canadian Mobile Satellite (MSAT). And we assume that the 3-state fading channel model is consist of Rayleigh fading state, Rician fading state, and shadow Rician fading state. This model can be used as a basis for the simulation of the land mobile satellite channel. The dynamic 3-state fading channel model is considered corresponding to different environments and the transitions between these environments. From the numerically calculate results, the DS/CDMA-BPSK system with MUI-20, PG-511 can not achieve the BER performance (
). And the channel capacity did not meet the system requirement. Also, we know that the BER performance is depend m the occupancy probability of radio channel and the degree of shadow. From the results, we how that during shadowed time intervals it is necessary to use some form of error control coding and receiver diversity in order to support reliable data communication.
DDS를 이용한 중단파대 국ㆍ영문용 DSC/NBDP 개발에 관한 연구
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 805~817
In this paper, the needs for introduction and adoption of MㆍHF DSC/NBDP system and for developments of its circuits and call sequences for use in the maritime mobile services for small-ships, leisure-ships and fishing ships are analyzed, discussed. Also design and implement for MㆍHF(1.6-4MHz) DSC/NBDP system is discussed. Most of casualties have been arisen from small-ships and fishing ships during last 5 years. So, the SAR schematic plans should been prepared to prevent casualties and facilitate the activities of SAR for those ships. DSC/NBDP for MㆍHF system is able to fulfill the roles of efficient SAR communication functions, and to advance the SAR system to small ships and fishing ships. This study is focused on the techniques of processing the DSC call sequences and the ARQ sequences of NBDP system. Especially ARQ sequences are expanded into processing of Korean letters, designed the call sequences and code conversion algorithm for Korean-code. It will be evaluated the availability of Korean-NBDP system. In designing the Transmitting circuits and Receiving circuits, for the carrier generation, DDS(Direct Digital Synthesizer) is used in stead of the Phase Locked Loop and frequency conversion by the mixer, BPF. And PSK modulation signals are directly generated by the controls of DDS, which show the characteristics of Spurious Free Dynamic Range are below -62dBc. Also, the monolithic U subsystem IC which provides various functional components, AD608 is used for designing the receiving circuitsㆍAnd the algorithm of Phasing methode for FSK demodulation are devised to process IF frequency 455kHz in the IF circuits
A Study on Design and Implementation of Hangul-NAVTEX Simulator
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 819~830
NAVTEX system is an international automated direct-printing service, broadcast on 5181kHz and 490kHz, for the promulgation of navigational and meteorological warnings and urgent information to ships. With our government's adoption of the international convention for SAR(Search and Rescue) in 1993, various trials for the installation of NAVTEX system have been executed by the government committee, relating laboratory and experts. An important consideration of the installation for NAVTEX system is the availability that could broadcast messages written in korean letter. Also, the receiver which can process the signal demodulated from the two frequencies, 518kHz and 490kHz, should be developed and supplied in domestic. In this paper, the code table and algorithm for conversions between NAVTEX characters and Korean Letters are studied, and signal processing techniques of code conversion are developed. Circuit design and implementation of the NAVTEX simulator using the Direct Digital Synthesizer are discussed, code conversion algorithm and signal processing technique of the NAVTEX transmission are programmed in its circuits. For evaluating the its functional characteristics, receiving module which has I-Q channel structure is designed. From the measurements of simulator, the characteristics show the frequency stability of the
and Spurious free dynamic range is -63dBc. And the simulator can generate simultaneously wanted signal and several interfere signals. So, its capability is valuable for designers of the transmitting system and NAVTEX receiver, for provider as testing facilities of the type approval.
A Design and CPLD Implementation of 20Mbps Viterbi Decoder with 64-State
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 831~837
Performance Evaluation of Direct Broadcasting Satellite Channel using a MC and QA Method
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 839~847
This paper presents the performance evaluation of direct broadcasting satellite by monte-carlo(MC) and quasi-analytic(QA) simulation method in the existence of uplink/downlink adjacent channel interference(ACI), co-channel interference(CCI), and gaussian noise. Korea's satellite system parameters and link design are used at the simulation. MC and QA simulation methods are a valuable adjunct to analytical performance.
A Study on the X-Band Active Radar Reflector for safety at the Sea
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 849~858
There are several improved designs of passive radar reflector available, but their performance is ultimately limited by the cross-section area and this is governed by the size of the buoy and the acceptable windage. Therefore it is needed to investigate the low-cost, low power, a active device that can be improve the reliability of response. Active Radar Reflector(AAR) consists of a microwave amplifier with separate receive and transmit antennas. It is a device which automatically transmits a signal in response to an interrogating signal received. It was intended to improve the consistency of the radar return from the buoy and the small craft, particularly in poor sea conditions. And it directly improves safety of navigation at sea.
The Laser Calibration Based On Triangulation Method
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 859~865
Many sensors such as a laser, and CCD camera to obtain 3D information have been used, but most of algorithms for laser calibration are inefficient since a huge memory and experiment data are required. This method saves a memory and an experimental data since the 3D information are obtained simply triangulation method. In this paper, the calibration algorithm of a slit km laser based on triangulation method is introduced to calculate 3D information in the real world. The laser beam orthogonally mounted on the XY table is projected on the floor. A CCD camera observes the intersection plane of a light and an object plane. The 3D information is calculated using observed and calibration data.
Simple Camera Calibration Using Neural Networks
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 867~873
Camera calibration is a procedure which calculates internal and external parameters of a camera with the Down world coordinates of the control points. Accurate camera calibration is required for achieving accurate visual measurements. In this paper, we propose a simple and flexible camera calibration using neural networks which doesn't require a special knowledge of 3D geometry and camera optics. There are some applications which are not in need of the values of the internal and external parameters. The proposed method is very useful to these applications. Also, the proposed camera calibration has advantage that resolves the ill-condition as object plane is near parallel image plane. The ill-condition is frequently met in product inspection. For little more accurate calibration, acquired image is divided into two regions according to radial distortion of lens and neural network is applied to each region. Experimental results and comparison with Tsai's algorithm prove the validity of the proposed camera calibration.
control of inverted pendulum system using linear fractional representation
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 875~885
This paper presents an application of LMI-based techniques to the mixed
control of an inverted pendulum. The linear model of the inverted pendulum represented by an LFR(Linear Fractional Representation) model of uncertainties is derived. Considered uncertainties are three nonlinear components and a parameter uncertainty Augmenting the LFR model by adding weighting functions, we get a generalized plant, for which we design a mixed
controller using the LMI technique. To evaluate control performances and robust stability of the mixed
controller designed, we compare it with the
controller through the simulation and experiment. The mixed
controller shows the better control performances and robust stability than the
controller in the sense of pendulum angle.
Frequency control method of ozonator power supply
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 887~893
The characteristics of ozone generator targeted for air or water sterilizing in the vessel utilizing the surface corona discharge between the electrodes on the ceramic substrate was investigated by using the frequency control method. The frequency control was achieved by controlling the degree of resonance between the secondary winding inductance of transformer and the electrode capacitance of ceramic discharge plate, and the range of control was found to be 5 times of discharge current. This frequency control method showed the efficiency of 28 mP ozone generation and the stability within 3.4 % when the input voltage was varied within 40% range. The frequency control method is regarded to be more efficient way of corona discharge control compared to the conventional on/off control or voltage control methods.
Identification of Linear Model of Tandem Cold Mill Using N4SID Algorithm
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 895~905
This paper identifies a linear time-invariant mathematical model of each stand of a five-stand tandem cold mill to design a robust
thickness controller by applying input and output data sets to N4SID (Numerical algorithms for Subspace State Space System Identification) method. The input-output data sets describe interstand interference in the process of tandem cold rolling and are obtained from a nonlinear simulator of the tandem cold mill. In result, it is shown that the identified model well approximates the nonlinear model than a Taylor linearized model. Furthermore, uncertainties including roll eccentricity and incoming strip variation are quantitatively analyzed from the plot of maximum singular values.
A Study on Model Identification of Electro-Hydraulic Servo Systems
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 907~914
This paper studies on the model identification of electro-hydraulic servo systems, which are composed of servo valves, double-rod cylinder and load mass. The identified plant is described as a discrete-time ARX or ARMAX model which is respectively obtained from the identification algorithms of least square error method, instrumental variable method and prediction error method. where a nominal model and the variation of model parameters are quantitatively evaluated.
Anaysis of electron transport characteristics using full band impact ionization model on GaAs - field direction dependent analysis -
Journal of the Korea Institute of Information and Communication Engineering, volume 3, issue 4, 1999, Pages 915~922
The field dependent characteristics of electron transport with GaAs impact ionization have been analyzed, using GaAa full band E-k relationship. The E-k relationship is derived from empirical pseudopotential method, using Fermi's golden rule and local form factor, and Brillouin zone is divided into tetrahedrons for calculating impact ionization rate, and tetrahedron method, in which integrates each tetrahedrons, is used. Monte Carlo simulation is used for analyzing anisotropy of impact ionization. A result of transient analysis for impact ionization has presented that anisotropy of impact ionization only arises during transient state and impact ionization is isotropic under steady state. Anisotropic characteristics of impact ionization for GaAs, which is presented in this paper, can be used in carrying out a transient analysis for GaAs devices.