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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Journal of Advanced Navigation Technology
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Journal DOI :
The Korea Navigation Institute
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Volume & Issues
Volume 10, Issue 4 - Dec 2006
Volume 10, Issue 3 - Sep 2006
Volume 10, Issue 2 - Jun 2006
Volume 10, Issue 1 - Mar 2006
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Sensorless Sliding Mode Control of an Induction Motor using Adaptive Speed Observer
Jie, Min-Seok ; Kim, Chin-Su ; Lee, Jae-Yong ; Lee, Kang-Woong ;
The Journal of Advanced Navigation Technology, volume 10, issue 3, 2006, Pages 191~197
In the paper propose a sensorless sliding mode control method of an induction motor using an adaptive speed control. The control objective is apply to adaptive speed observer instead of a encoder and to remove errors using the sliding mode current controller by parameters variation and disturbances that include the current controller. A stability of the sliding mode current controller and the adaptive speed observer using a design controller is guaranteed by the Lyapunov stability criterion. The performance of the proposed control system is demonstrated by simulation using the matlab silmulink and experimental results using induction motor show that the proposed method can apply an induction motor control.
Analysis of the TE Scattering by a Resistive Strip Grating Over a Grounded Dielectric Plane
Yoon, Uei-Joong ;
The Journal of Advanced Navigation Technology, volume 10, issue 3, 2006, Pages 198~204
In this paper, TE(transverse electric) scattering problems by a resistive strip grating on a grounded dielectric plane according to the strip width and grating period, the relative permittivity and thickness of dielectric layer, and incident angles of a TE plane wave are analyzed by applying the FGMM(Fourier-Galerkin Moment Method) known as a numerical procedure. The induced surface current density is simply expanded in a Fourier series by using the exponential function as a simple function. The reflected power gets increased according as the relative permittivity and thickness of dielectric multilayers gets increased, the sharp variations of the reflected power are due to resonance effects were previously called wood's anomallies. To verify the validity of the proposed method, the numerical results of normalized reflected power for the uniform resistivity R = 0 as a conductive strip case show in good agreement with those in the existing paper.
Compensation for Distorted RZ Signals in 8×40 Gbps WDM System with NZ-DSF using Modified MSSI
Lee, Seong-Real ;
The Journal of Advanced Navigation Technology, volume 10, issue 3, 2006, Pages 205~212
In this paper, the numerical methods of searching the optimal position of optical phase conjugator (OPC) and the optimal dispersion coefficients of fiber sections are proposed, which are able to effectively compensate overall channels in
Gbps WDM system with non zero - dispersion shifted fiber (NZ-DSF) as an optical fiber. And the compensation characteristics in the system with two induced optimal parameters are compared with those in the system with the currently used mid-span spectral inversion (MSSI) in order to verify the availability of the proposed methods. It is confirmed that the compensation extents of the distorted 8-channel signals are improved within 2 dB power penalty by applying the induced optimal parameters into WDM system. It is also confirmed that two optimal parameters less related with the searching procedure of these optimal values, only if these depend on each other.
Performance of Turbo Coded OFDM/FHMA Hybrid Systems in Impulsive Interference and Broadband Wireless Communication Channel
Kang, Heau-Jo ;
The Journal of Advanced Navigation Technology, volume 10, issue 3, 2006, Pages 213~218
In this paper, we analyzed the performance of orthogonal frequency division multiplexing/ frequency hopping multiple access(OFDM/FHMA) hybrid system that in impulsive interference and broadband wireless communication channel then we applied the turbo code scheme to make satisfied in data and voice transmission service. Also, we compared the bit error rate(BER) performance of turbo coded diversity scheme in the OFDM/FHMA hybrid system. As a result of simulation, proposed OFDM/FHMA hybrid system shows the enhancement of 10 times compared to the general OFDM/FHMA system.
Adaptive Object Classification using DWT and FI
Kim, Yoon-Ho ;
The Journal of Advanced Navigation Technology, volume 10, issue 3, 2006, Pages 219~225
This paper presents a method of object classification based on discrete wavelet transform (DWT) and fuzzy inference(FI). It concentrated not only on the design of fuzzy inference algorithm which is suitable for low speed uninhabited transportation such as, conveyor but also on the minimize the number of fuzzy rule. In the preprocess of feature extracting, feature parameters are extracted by using characteristics of the coefficients matrix of DWT. Such feature parameters as area, perimeter and a/p ratio are used obtained from DWT coefficients blocks. Secondly, fuzzy if - then rules that can be able to adapt the variety of surroundings are developed. In order to verify the performance of proposed scheme, In the middle of fuzzy inference, the Mamdani's and the Larsen 's implication operators are utilized. Experimental results showed that proposed scheme can be applied to the variety of surroundings.
A Study on the Position Error of the Aids to Navigation as a Safety Factor at Sea
Kwon, Hyuk-Dong ; Kim, Woong-Gyu ; Lee, Joo-Hyung ; Park, Gyei-Kark ;
The Journal of Advanced Navigation Technology, volume 10, issue 3, 2006, Pages 226~234
Aids to Navigation is one of the most important facility for safety at sea. However, in terms of position there always exists discrepancy in inventory by media and/or organizational body who maintains the facility which may result in incredibility for navigator's position fixing or hazard avoidance. This paper suggests two major factors as the causes of the position error when they design, install and survey the aids to navigation. One is the function of direction of tide and water depth which makes swinging circle. The other is a variable value by time resulting from multiple coordination of satellites in contact. This paper aims to minimize inaccuracy by verifying its reason through numerical analysis over inherent position error.
Effects on Phase Noise of QSPK, MQAM, OFDM-QPSK, OFDM-MQAM, and 8-VSB Modulations
Kwon, Joh-Ann ; Kim, Ihn-Seok ;
The Journal of Advanced Navigation Technology, volume 10, issue 3, 2006, Pages 235~249
In this paper, SER(Symbol Error Rate) variation and effects on SER by phase noise at various frequency offset of the local oscillator in digital communication systems are gerneralyzed for QPSK(Quadrature Phase Shift Keying), MQAM(M-ary Quadrature Amplitude Modulation), OFDM(Orthogonal Frequency Division Multiplex)-MQAM, OFDM-QPSK and 8-VSB(Vestigal Side Bands) modulation methods and compared those with the ideal cases, which have no phase noise, through the MATLAB simulation. And the ration between modulation bandwidths and the SER on the various frequency offsets on the above modulation methods have been analyzed for the system requirement of minimum phase noise characteristics. From this study, we have confirmed that the most sensitive modulation method on the phase noise is OFDM-MQAM and that the relatively insensitive method 8-VSB.
Implementation of Music Source Classification System by Embedding Information Code
Jo, Jae-Young ; Kim, Yoon-Ho ;
The Journal of Advanced Navigation Technology, volume 10, issue 3, 2006, Pages 250~255
In digital multimedia society, we usually use the digital sound music ( Mp3, wav, etc.) system instead of analog music. In the middle of generating or recording and transmitting, if we embed the digital code which is useful to music information, we can easily select as well as classify the music title by using Mp3 player that embedded sound source classification system. In this paper, sound source classification system which could be classify and search a music informations by way of user friendly scheme is implemented. We performed some experiments to testify the validity of proposed scheme by using implemented system.
An Analog Predistortion Linearizer using Series Feedback Structure
Kim, Ell-Kou ; Jeon, Ki-Kyung ; Kim, Young ; Yoon, Young-Chul ;
The Journal of Advanced Navigation Technology, volume 10, issue 3, 2006, Pages 256~262
This paper proposes a new predistortion linearizer to compensate for AM/AM and AM/PM in the nonlinear characteristics of amplifier. This consists of common-emitter amplifier and schottky diode that is connected between emitter and ground. When effective resistance of the schottky diode with bias condition varies, common-emitter amplifier with series feedback has a increase of amplitude and expansion of phase. This makes a amplifier nonlinear characteristics are to be improved. The proposed linearizer and amplifier has been manufactured and tested to operate in cellular base station frequency (869~894MHz). The test results show that third order intermodulation distortion (IMD3) cab be removed by more than 10.4dB in case of CW 2-tone signals
=1MHz, and the adjacent channel power ratio (ACPR) also can be improved by more than 9.6dB for CDMA IS-95 1FA signals.
Embedded System Design of Automotive Media Server Platform with the MOST Interface
Kwak, Jae-Min ; Park, Pu-Sik ;
The Journal of Advanced Navigation Technology, volume 10, issue 3, 2006, Pages 262~267
For growing need for the multimedia application in the vehicles, the MOST protocol has been focused on. The MOST protocol supports three kinds of communication modes; short control message, asynchronous packets, and reserved synchronous stream data. Because of a variety of transportation, the MOST is suitable for various applications in vehicle environment. In this paper, we implemented embedded system which is MOST-enabled AMS platform and tested the network communication operation through the control port and the synchronous channel of the source port. We implemented the prototype platforms which communicate each other on the MOST's POF network. Moreover we implemented the DivX decoder attached AMS platform and verified the operation by transferring the video stream and the control messages through the MOST network.
Performance Evaluation of Time Hopping Pulse Position Modulated Ultra-Wideband System for Home Sensor Network
Roh, Jae-Sung ;
The Journal of Advanced Navigation Technology, volume 10, issue 3, 2006, Pages 268~275
The rapid proliferation of in-home and office information applications and services is driving the need for new wireless technologies enabling wideband short range multimedia communications. Due to the growing demand for higher quality media and faster wireless connections, several IEEE standardization groups are considering very high data rate alternatives physical layer(s) for Wireless Personal Area Network (WPAN). The Ultra Wide Band (UWB) multiple access technology based on very narrow pulse transmission, is one viable candidate for these applications providing very high bit rates services, low power consumption and accurate positioning capability. In this paper we provide a methodology to evaluate the UWB system BER performance in UWB wireless fading networks with power controlled UWB devices are considered. Results can be used to analyze the performance of a given network topology and to provide useful design ideas for an UWB home sensor network.
Coverage Enhancement in TDD-OFDMA Downlink by using Simple-Relays with Resource Allocation and Throughput Guarantee Scheduler
Byun, Dae-Wook ; Ki, Young-Min ; Kim, Dong-Ku ;
The Journal of Advanced Navigation Technology, volume 10, issue 3, 2006, Pages 275~281
Simple-relay aided resource allocation (SRARA) schemes are incorporated with throughput guarantee scheduling (TGS) in IEEE 802.16 type time division duplex - orthogonal frequency division multiple access (TDD-OFDMA) downlink in order to enhance service coverage, where the amount of resources for relaying at each relay is limited due to either its available power which is much smaller than base station (BS) power or the overhead required for exchanging feedback information. The performance of SRARA schemes is evaluated with schedulers such as proportional fair (PF) and TGS at 64kbps and 128kbps user throughput requirements when total MS power is set to 500mW or 1 W. For 64kbps throughput requirement level, more improvement comes from relay than scheduler design. For 128kbps case, it comse from scheduler design than relay due to the fact that simple relay can't help using strictly limited amount of resources for relaying function.