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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 14, Issue 6 - Dec 2010
Volume 14, Issue 5 - Oct 2010
Volume 14, Issue 4 - Aug 2010
Volume 14, Issue 3 - Jun 2010
Volume 14, Issue 2 - Apr 2010
Volume 14, Issue 1 - Feb 2010
Selecting the target year
Study on the Spectrum Sharing between IMT and FSS Systems Considering MIMO SDMA Interference Mitigation Technique in C Band
Kang, Young-Heung ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 587~595
Spectrum sharing between wireless systems becomes a critical issue clue to emerging new technologies and spectrum shortage. Recently, IMT system has been allocated in the same frequency C band (3400-4200MHz) along with FSS services on co-primary basis which means that harmful. interference probability may be inspired. In this paper, to estimate the spectrum sharing between IMT and FSS systems, I propose the minimum separation distances as a sharing criterion of I/N=-10dB using the interference to noise ratio(I/N) received at the reference FSS earth station from IMT multiple base station. Especially, same results imply that I/N values can be greatly reduced with MMO SDMA interference mitigation technique of IMT base station so that FSS and IMT systems can co-exist in the sam e frequency with appropriate separation distance.
Homing Guidance Law of Anti-Ship Missiles Using Flight Path Angle
Jin, Sheng-Hao ; Yang, Bin ; Hwang, Chung-Won ; Park, Seung-Yub ; Park, Seung-Je ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 596~603
This paper presents a homing guidance law of anti-ship missiles using flight path angle to achieve an impact time constraint as well as an impact angle constraint. the independent variable in the nonlinear engagement model is change d from the flight time to the heading angle of the missile. The proposed guidance law can home a missile to the target with zero miss distance as well as satisfying both of the impact angle and time constraints. The performance of the proposed guidance law is evaluated by the computer simulations.
Analysis on the requirement of UMPC to construct the tactical datalink system
Lim, Jun-Ho ; Lee, Seoung-Pil ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 604~609
The tactical datalink system has been recognized as the key element in Network Centric Warfaret(NCW). The military has been putting great efforts into establishing datalink system using existing tactical radio and UMPC. but the aircraft operational environment and the requirement specification for equipments mounted in the avionics are differentiated with those in other platforms, so special efforts are needed to select suitable UMPC. In this paper, we consider the requirement analysis for UMPC in respect of processor performance, operation system (OS) and NVG compatibility. Additionally we have to make a effort to understand the operational environment of aircraft and examine th standard to select the appropriate UMPC, and then we expect to establish the tactical datalink system successfully.
An Analysis on Characteristics of Abnormal Broadcast GPS Ephemeris
Lee, Je-Young ; Kim, Hee-Sung ; Lee, Hyung-Keun ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 610~617
This paper analyzes the characteristics of abnormal broadcast GPS ephemeris by comparing distances between the receiver and the satellites. Effects of abnormal ephemeris on receiver's position estimate are closely related with range errors caused by variations of satellite positions. In more detail each range error depends on the satellite position error and the line of sight vector. Based on the fact, the ephemeris parameters are classified into three types depending on the size, the shape, and the shape of the satellite orbit to analyze the fault characteristics. The effects of satellite position errors caused by the three type s of parameters on the receiver's position estimate are analyze d in detail.
Development of Automatic Code Generation of Condensation Algorithm using MATLAB
Lee, Yang-Weon ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 618~624
This paper address the problem of tracking multiple objects encountered in many situations in developing condensation algorithms. The difficulty lies on the fact that the implementation of condensation algorithm is not easy for the general users. We propose an automatic code generation program for condensation algorithm using MATLAB tool. It will help for general user who is not familiar with condensation algorithm to apply easily for real system. The merit of this program is that a that a general industrial engineer can easily simulate the designed system and confirm the its performance on the fly.
Study on the time-delay compensation of RTK correction message for improvement of continuous position surveying performance under unexpected temporal datalink loss/cut-off
Park, Byung-Woon ; Song, June-Sol ; Kee, Chang-Don ; Yang, Chul-Soo ; Tcha, Dek-Kie ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 625~631
In this paper, robustness performance of SNUR message is compared with those of existing ones, RTCM(Radio Technical Commission for Maritime Services) v2 MT(Message Type) 18/19 and MT 20/21 under a poor broadcast condition such as temporary data loss or disconnection We defined the temp oral data loss as 2 second delay and reconnection after disconnection as 7 second latency, and then evaluated its robustness for each latency case by double differentiating the observables. Our result shows that SNUR protocol method can reduce the latency error of the existing RTCM messages by 30~60%. Moreover, a rover using SNUR message, whose latency error is bounded within 1/4 L1 wave length, can figure out its own fixed position continuously in spite of 7 second disconnection, while the other using RTCM message, whose error is larger than half wave length, cannot keep its previous fixed solution.
A Study on Precise Positioning with Doppler Measurements for Ground Transportation System
Lee, Byung-Hyun ; Jee, Gyu-In ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 632~639
Ground Transportation is one of the most required field that users need positioning information Especially, more precise position can make smart traffic management possible and bring convenience to users. By advanced wireless network, cars can receive the GPS information of reference station in any tim e and any where. Thus land vehicles are possible to process precise positioning. In general, for precise positioning code and phase measurements are used. But receivers provide not only code and phase measurements but also doppler measurements and Doppler is direct measurement of velocity. In this paper, because velocity is very important information required in Ground Transportation, precise positioning for Ground Transportation is studied. For precise positioning RTK(Real-Time Kinematic) was used and double differenced doppler measurements were added, As a Result, positioning error by multipath and cycle slip was soften. However there still remained Positioning error. Thus smoothing technique using doppler measurement in position domain is used for softening positioning error.
Fault Detection Method of GNSS Carrier Phase Measurement using Vehicle Velocity and Antenna Baseline Distance
Park, Jae-Ik ; Lee, Eun-Sung ; Heo, Moon-Beom ; Nam, Gi-Wook ; Sim, Eun-Sup ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 640~647
Many methods have been proposed to detect faults of carrier phase measurements, but there are no distinguished methods for land transportation systems. in this paper, the baseline constraints are used to detect faults in GPS carrier phase measurements with vehicle dynamic information. The faults include the multipath on GPS carrier measurements. Multiple antenna groups are used for this research. In the measurement domain the fault detection has been accomplished so that the implementation is easier than other methods.
Safety Improvement Test of a GNSS-based AGV
Kang, Woo-Yong ; Lee, Eun-Sung ; Han, Ji-Ae ; Heo, Moon-Beom ; Nam, Gi-Wook ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 648~654
In this paper, a navigation system was designed, and performance tested in order to confirm the safety improvement of the GNSS(Global Navigation Satellite System)-based AGV(Autonomous Guided Vehicle) which used only position information on of GNSS. We developed DR(Dead Reckoning) navigation system that involve the use of GNSS abnormal positoning error detection and GNSS signal outage. The test results show that GNSS positioning error is detection can be archived with an error of more than 0.15m. In addition, the DR driving position error is 1.5m for an 8s GNSS positioning service outage.
A study on Improvement of Conversion Efficiency of Rectifying circuit for Wireless Power Transmission
Park, Dong-Kook ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 655~660
This paper examines RF-to-DC conversion efficiency of rectifying circuit for wireless power transmission. The rectifying circuit consists of low pass filter, diode circuits and dc pass filter. All these components may be effect on the conversion efficiency. Using the simulation, we study these components how to effect on the conversion efficiency. On the basis of the simulation results, the 912MHz rectifying circuit with 50% efficiency at low input power such as 0dBm is fabricated and its characteristics are measured.
The SCORM Based Learning Support Framework for Ubiquitous Environment
Jeong, Hwa-Young ; Hong, Bong-Hwa ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 661~667
A lot of existence e-learning are connected SCORM and LMS. And u-learning was researching as one of the new trend. But there are few research paper to connect the existing SCORM and LMS. In this paper, we proposed u-learning framework with connect the SCORM and LMS. And we used the mobile equipment transform module and learning object reconstruction module to apply each different characteristics of mobile equipment. Especially, information of the mobile equipment was stored and managed using the meta-data of the equipment.
Performance Improvement of WDM Channels using Inline Dispersion Management in Transmission Link with OPC Placed at Various Position
Lee, Seong-Real ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 668~676
Optimal net residual dispersions (NRDs) of inline dispersion management (DM) for compensating the signal distortion of
Gbps WDM channels in optical transmission links, in which optical phase conjugator (OPC) is placed from 250 km to 750 km by spacing 50 km in 1,000 km total transmission length of single mode fiber (SMF), are induced as a function of various ope positions. And, performance improvement of WDM channels in transmission links with the induced optimal NRD is investigated by comparing with that in transmission links with NRD = 0 ps/nm. It is confirmed that optimal NRDs are decided by displacement of OPC from mid-way of total transmission length, i.e. 500 km, and the determinating and applying of optimal NRD in case of ope displacement into transmitters is more stable and effective than that in case of ope displacement into receivers from 500 km. Also, it is shown that eye opening penalties (EOPs) of WDM channels in transmission links with optimal NRD are improved by 1.5 dB to 3 dB, which are related with OPC position, from that obtained in transmission links with fixed NRD of 0 ps/nm.
A Study on Channel Estimation for High-speed Binary CDMA Systems
Kang, Sung-Jin ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 677~683
In this paper, a channel estimation scheme for high-speed Binary CDMA systems is proposed and its performances are investigated. In high-speed Binary CDMA which adopt high order modulations, since BER(bit error rate) performances are deteriorated when equalizer does not converge enough during preamble period it is preferred to set the optimum coefficients of equalizer through channel estimation. In this paper, taking notice of repetition of CAZAC sequence in preamble period, a channel estimation scheme is proposed, which can improve estimation performances with few complexity increase. From the simulation results, one can see that the proposed channel estimation scheme can be implemented simply with no performance deterioration compared to the conventional one.
A Study on Polynomial Pre-Distortion Technique Using PAPR Reduction Method in the Next Generation Mobile Communication System
Kim, Wan-Tae ; Park, Ki-Sik ; Cho, Sung-Joon ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 684~690
Recently, the NG(Next Generation) system is studied for supporting convergence of various services and multi mode of single terminal. And a demand of user for taking the various services is getting increased, for supporting these services, many systems being able to transmit a large message have been appeared. In the NG system, it has to be supporting the CDMA and WCDMA besides the tele communication systems using OFDM method with single terminal An intergrated system can be improved with adopting of SoC technique. For adopting SoC technique on the intergrated terminal, we have to solve the non linear problem of HPA(High Power Amplifier). Nonlinear characteristic of HPA distorts both amplitude and phase of transmit signal, this distortion cause deep adjacent channel interference. We adopt a polynomial pre-distortion technique for this problem. In this paper, a noble modem design for NG mobile communication service and a method using polynomial pre-distorter with PAPR technique for counterbalancing nonlinear characteristic of the HPA are proposed.
Study of Undeniable Signatures Schemes based on Zero-Knowledge Proof
Gui, Yi-Qi ; Choi, Hwang-Kyu ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 691~696
The main idea is to protect the signer of a document against the document being digitally distributed without the cooperation of signer. This paper proposes a new scheme of undeniable signature, which is so effective and improved D. Chaum's scheme. And our scheme which is zero-knowledge proved by using one-way function and partition - selection method, shows that its communication(challenge-response) only needs much fewer times during the confirmation protocol and disavowal protocol respectively, being very useful for wireless network environment. In the meantime our scheme allows the verifier to verify that the signature is valid, while the signer doesn't know the original message and the signature, to preserve the privacy of the verifier.
Design of the Patrol Robot with Variable Weels
Hwang, Sun-Myung ; Jo, Ja-Yun ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 697~709
The patrol robot is a typical extreme robot for the military use. It helps soldiers by detecting and informing a potential risk instead, and warning earlier. Also, these kinds of extreme robots need good ability to conquest rough road. In this paper, we studied new mechanism through which we can get high speed on the flat road with round shape wheels, and simultaneously can get good ability to overcome rough road with blade-shape wheels. The shape of the wheels is being self-adaptively changed automatically according to the condition of the road without using additional actuator.
Syntheses and realization of Quaternary Galois Field Sum-Of-Product(QGFSOP) expressed 1-variable functions Permutational Literals
Park, Dong-Young ; Kim, Baek-Ki ; Seong, Hyeun-Kyeong ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 710~717
Even though there are 256 possible 1-qudit(1-variable quantum digit) functions in quaternary logic, the most useful functions are 4!=24 ones capable of representing in QGFSOP expressions by possible permuting of 0,1,2, and 3. In this paper, we propose a permutational literal(PL) representation and a QPL(Quaternary PL) gate which use the operands of a multiplicand A and an augend D in
+D(GF4) operation as a control variable of multi-cascaded PLs. And we also present new PL synthesis algorithms to synthesize QGFSOP expressed 24 (1-qudit) functions by applying three PL operators as ab(mutual permutation), + D(addition), and XA (multiplication). Finally architectures, circuits, and a CMOS implementation to realize proposed PL synthesis algorithms for
+D(GF4) functions are presented.
First-Person Shooter Game Development using Unreal Engine
Kim, Soo-Kyun ; Kang, Heau-Jo ; Sung, Kyung ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 718~724
The Unreal Engine is a free game engine developed by Epic Games. In this paper, we propose a First Person Shooter (FPS) game development using free Unreal Development Kit. The merit of Unreal engine provide a hight degree of portability, and it is a tool used by many game developers today, supporting a multitude of platforms on personal computers and many video game consoles with free toolkit. But it is required high-performance PC to develop game. This toolkit doe s not high-quality computer programming skill, just possible to develop FPS game easily.
An Attack Behavior Expressions for Web Attack Analysis and Composing Attack Database
Lee, Chang-Hoon ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 725~736
Nowadays, followed the internet service contents increasing makes also increase attack case on the web system. Usually web attack use mixed many kinds of attack mechanism for successfully attack to the server system. These increasing of the kinds attack mechanism, however web attack defence mechanism is not follow the spread of the attack. Therefore, for the defends web application, web attack should be categorizing and analysing for the effective defense. In this paper, we analyze web attack specification evidence and behavior system that use for effective expressions what we proposed. Also, we generate web attack scenario, it is for using verification of our proposed expressions.
An Implementation of OpenU Social Network Service System with Real-time Conversation and Collaboration
Cho, Byung-Ho ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 737~744
A Social Network Service(SNS) is the best attracting internet business model and serviced in the several countries. The Facebook is the most popular SNS in a foreign country and the Cyworld is most popular one in Korea. In this paper, after investing and analyzing the existing Social Network Services, I present a new OpenU Social Network Service based on Web 2.0 concepts. This is a next generation internet platform which can be communicated with real-time chatting and share d data and talked during seeing data by collaboration functions OpenU's main characteristics and functions by screen design and implementations are explained. And also OpenU's excellence by comparing with other SNSs system is presented.
Performance Analysis on the Narrowband Interference Rejection of Impulse Radio System in Frequency Coexistence Environment
Jang, Se-In ; Lee, Yang-Sun ; Kim, Si-Gwan ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 745~751
In this paper, the proposed a narrowband interference cancellation techniques for the frequence sharing of Ultra wideband Impulse Radio communication system and narrowband communication system. In this system, the narrowband communication signals can cause intolerant interferences to Impulse Radio signals. In this paper, Ultra wideband Impulse Radio system have been analyzed in AWGN, MAI and NI(Narrowband Interference) environment. Also, performance improvement has been obtained by adopting an adaptive notch filtering scheme using Complex Filter Bank and CCI canceller. The results show that there is a substantial enhancement in performance by employing the adaptive notch filtering and/or CCI canceller.
Efficient Small Write Method for DDR-SSD based Software RAID
Khil, Ki-Jeong ; Kwak, Dong-Ho ; Kwak, Yun-Sik ; Cheong, Seung-Kook ; Hwang, Jung-Yeon ; Choi, Kil-Seong ; Song, Seok-Il ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 752~759
In this paper, we propose differential-logging method to improve the performance of RMW(Read Modify Write) operations of DDR-SSD based software RAID. Small writes that are frequently occurred in enterprise applications are main factor to degrade the performance of RAID5. Once a block is updated in RAID5, the parity block of the block must be updated to maintain consistency of parity. Therefore, to process a small write request, we need to read its parity block stored in disk, read old data, perform XOR operation, and write updated data and parity block. Several methods for hard disk based software RAID are proposed to solve the small write problems in RAID 5. Ln this paper, we propose a differential-logging method which carefully considers the DDR-SSD to solve the small write problem in RAID 5. We show that our proposed method out performs the existing software RAID in LINUX through simulations.
Friction Torque Analysis of a Hydraulic Motor-Load System using Proportional Control Valve
Yu, Hwan-Shin ; Park, Hyung-Bae ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 760~766
In this paper, The static friction torque and viscous friction torque including hydraulic motor-load system driven by hydraulic proportional control valve analysis. The basic experimental was performed toward characteristic in pressure and flow rate in hydraulic system energy. The variable of friction torque was experiment on brake pressure variable using pneumatic brake system. The analysis of nonlinear friction and linear friction was perform ed toward friction characteristic of hydraulic system.
Flash-Conscious Storage Management Method for DBMS using Dynamic Log Page Allocation
Song, Seok-Il ; Khil, Ki-Jeong ; Choi, Kil-Seong ;
The Journal of Advanced Navigation Technology, volume 14, issue 5, 2010, Pages 767~774
Due to advantages of NAND flash memory such as non-volatility, low access latency, low energy consumption, light weight, small size and shock resistance, it has become a better alternative over traditional magnetic disk drives, and has been widely used. Traditional DBMSs including mobile DBMSs may run on flash memory without any modification by using Flash Translation Layer (FTL), which emulates a random access block device to hide the characteristics of flash memory such as "erase-before-update". However, most existing FTLs are optimized for file systems, not for DBMSs, and traditional DBMSs are not aware of them. Also, traditional DBMSs do not consider the characteristics of flash memory. In this paper, we propose a flash-conscious storage system for DBMSs that utilizes flash memory as a main storage medium, and carefully put the characteristics of flash memory into considerations. The proposed flash-conscious storage system exploits log records to avoid costly update operations. It is shown that the proposed storage system outperforms the state.