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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korea Institute of Military Science and Technology
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The Korea Institute of Military Science and Technology
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Volume & Issues
Volume 12, Issue 6 - Dec 2009
Volume 12, Issue 5 - Oct 2009
Volume 12, Issue 4 - Aug 2009
Volume 12, Issue 3 - Jun 2009
Volume 12, Issue 2 - Apr 2009
Volume 12, Issue 1 - Feb 2009
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A Conceptual Model for the Performance Analysis Simulator of a Weapon Launching System
Yoon, Jae-Moon ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 4, 2009, Pages 407~414
This paper describes a conceptual model for the performance analysis simulator of a weapon launching system. The system performance analysis simulator is envisioned to provide an integrated analysis environment in which the system performance and operational effectiveness can be analyzed in more rapid and efficient way. The conceptual model for the simulator describes a referent independently of specific technology and implementation, and it can be used to transform the simulator requirements into the simulator system specifications.
Underwater Acoustic Environment and Low Frequency Acoustic Transmission in the Sub-Polar Front Region of the East Sea
Lim, Se-Han ; Ryu, Gun-Hee ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 4, 2009, Pages 415~423
To investigate low frequency acoustic transmissions in the Sub-Polar Front(SPF) of the East Sea, numerical experiments are conducted with Range dependent Acoustic Model(RAM) using Circulation Research of the East Asian Marginal Seas(CREAMS) data and Autonomous Profiling Explorer(APEX)) data. Significant seasonal variations of sea water properties are existed across the Sub-Polar Front(SPF) region from the north and the south. The model results show that Transmission Loss(TL) decrease(about 20dB) with ideal front in the warm region whereas TL increase(about 25dB) with ideal front in the cold region. Regardless of season(both in summer and winter), when the sound source is located in the cold region of the SPF, the model results show weak TL, compared to the case of the source in the warm region(Maximum difference of TL reaches 28dB). This difference between the cases when the source is located in the cold region and the warm region, is accounted for from the different vertical profiles of sound speed in both regions.
A Defense Interoperability Evaluation Model for Weapon Systems Considering Technical and Non-Technical Attributes
Han, Ik-Joon ; Bang, Choon-Sik ; Yoon, Gwang-Sik ; Cheon, Jae-Young ; Kim, Hyung-Gyoon ; Cho, Byoung-In ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 4, 2009, Pages 424~436
In the modern warfield, as the defense systems has been digitalized, intelligent, and working with network, the importance of interoperability among the systems has been also increasing. KMND(Korean Ministry of National Defense) has developed and used the SITES(Systems Interoperability Test & Evaluation System) based on Korean LISI(Levels of Information Systems Interoperability). SITES had been developed in order to evaluate the interoperability among information systems from the viewpoint of technical attributes. In this paper, we propose the extended interoperability evaluation model which can be applied not only the information systems, but also the weapon systems. Moreover, the extended interoperability evaluation model also includes the consideration of non-technical attributes.
Performance Comparison of LOB-based Emitter Localization Algorithms
Lee, Joon-Ho ; Kim, Min-Cheol ; Cho, Seong-Woo ; Jin, Yong-Ki ; Lee, Dong-Keun ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 4, 2009, Pages 437~445
In this paper, we present the performance of the LOB(line of bearing) - based emitter localization algorithm. The linear LSE(least-squared error) algorithm, nonlinear LSE algorithm and Stansfield algorithm are considered. In addition, we focus on the performance improvement of the weighted estimation compared with the unweighted estimation. Each estimation algorithm is briefly introduced, and the performance of the algorithm is illustrated using the numerical results.
Development of A X-band 12 W High Power Amplifier MMIC
Chang, Dong-Pil ; Noh, Youn-Sub ; Lee, Jeong-Won ; Ahn, Ki-Burm ; Uhm, Man-Seok ; Yom, In-Bok ; Na, Hyung-Ki ; Ahn, Chang-Soo ; Kim, Sun-Joo ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 4, 2009, Pages 446~451
In this paper, we described the design and test results of a high output power amplifier MMIC developed by using 0.5um power pHEMT processes on a 6-inch GaAs wafer for the X-band T/R module application. In the MMIC design, we have used a simple on-chip gate active bias technology to compensate the threshold-voltage variation of pHEMT during the fabrication process and 16-to-1 power combining method to achieve the output power over 10watt. The fabricated chip has an output power over 12watts and maximum PAE of 32% over the frequency range of fo +/-750MHz.
A 6-Bit MMIC Digital Attenuator with High Attenuation Accuracy and Small Phase Variation for X-band TR Module Applications
Ju, In-Kwon ; Yom, In-Bok ; Lee, Jeong-Won ; Lee, Soo-Ho ; Ahn, Chang-Soo ; Kim, Sun-Joo ; Park, Dong-Un ; Oh, Seung-Hyeup ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 4, 2009, Pages 452~459
A 6-bit MMIC digital attenuator applicable to X-band TR module has been developed by using
GaAs pHEMT processes. The Switched-T attenuator scheme and the switched-path attenuator scheme were adopted to obtain low insertion loss and small phase variation, respectively. Resistors and transmission lines are optimized to achieve the digital attenuator with high attenuation accuracy and small phase variation. The digital attenuator has RMS error of 0.4dB, resolution of 0.5dB and dynamic range of 31.5dB. The measurement results show that in-out VSWRs are less than 1.5, phase variation is from -7 to +2 degrees and IIP3 is 36.5dBm.
A Study on the Selection of Alternatives for Flight Attendants to Adapt Flying Conditions using the Analytic Hierarchy Process
Seol, Hyeon-Ju ; Kim, Gyu-Ho ; Jung, Hyun-Wook ; Cho, Hwan-Kee ; Hwang, Chang-Su ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 4, 2009, Pages 460~468
The purpose of this study is propose an alternative for flight attendants to acquire equipment that could enhance the ability to adapt in flying conditions. Introducing and acquiring weapon system, such equipments should be deeply considered in multilateral aspects; reinforcements in the overall strategic status in the army, the ramifications that can contribute to military resources, and economic situations in the country. To do this, we first induced several criteria that can be used for evaluating alternatives. After that, we applied the analytic hierarchy process(AHP) approach to putting all factors into considerations in decision making for equipment acquirement. The results of this study are expected to have usefulness in formulating strategies and policies in selecting equipment acquisition alternatives for flight attendants.
Evaluation of MANET Protocol Scheme for TICN System
Son, Hye-Joung ; Kwon, Tae-Wook ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 4, 2009, Pages 469~475
TMMR(Tactical Multiband Multirole Radio) is one of the important equipments for TICN which is our next military tactical communication system and it supplies to the distribution of traffic of C2(Command & Control) and SA(Situation Awareness) for unit of Brigade and below. In this paper, we define the tactical needs of military communication, and evaluate MANET(Mobile Ad-hoc Network) protocol for the future digital battle-field through performance comparison with a network simulator.
A Study on a Shared Key Existence of ECC Based Key Distribution System
Lee, Jun ; Park, Jong-Bum ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 4, 2009, Pages 476~482
As a result from Hasse's theorem it is not always possible to share a common key between any two ECC public keys. Even though ECC algorithm is more efficient than any other Encryption's with respect to the encryption strength per bit, ECC ElGamal algorithm can not be used to distribute a common key to ECC PKI owners. Approaching mathematical ways in a practical situation, we suggest possible conditions to share a common key with ECC PKI's. Using computer experiments, we also show that these suggestions are right. In the conditions, we can distribute a common key to proper peoples with ECC ElGamal algorithm.
A Study on the Performance Improvement of GaAs Metamorphic HEMTs Using ICPCVD SiNx Passivation
Kim, Dong-Hwan ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 4, 2009, Pages 483~490
In this paper, a novel low-damage silicon nitride passivation for 100nm InAlAs/InGaAs MHEMTs has been developed using remote ICPCVD. The silicon nitride deposited by ICPCVD showed higher quality, higher density, and lower hydrogen concentration than those of silicon nitride deposited by PECVD. In particular, we successfully minimized the plasma damage by separating the silicon nitride deposition region remotely from ICP generation region, typically with distance of 34cm. The silicon nitride passivation with remote ICPCVD has been successfully demonstrated on GaAs MHEMTs with minimized damage. The passivated devices showed considerable improvement in DC characteristics and also exhibited excellent RF characteristics(
of 200GHz).The devices with remote ICPCVD passivation of 50nm silicon nitride exhibited 22% improvement(535mS/mm to 654mS/mm) of a maximum extrinsic transconductance(
) and 20% improvement(551mA/mm to 662mA/mm) of a maximum saturation drain current (
) compared to those of unpassivated ones, respectively. The results achieved in this work demonstrate that remote ICPCVD is a suitable candidate for the next-generation MHEMT passivation technique.
A Dynamic Calibration Technique for Piezoelectric Sensors Using Negative Going Dynamic Pressure
Kim, Eung-Su ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 4, 2009, Pages 491~499
The determination of response characteristics for pressure sensors is routinely limited to static calibration against a deadweight pressure standard. The strength of this method is that the deadweight device is a primary standard used to generate precise pressure. Its weakness lies in the assumption that the static and dynamic responses of the sensor in question are equivalent. Differences in sensor response to static and dynamic events, however, can lead to serious measurement errors. Dynamic techniques are required to calibrate pressure sensors measuring dynamic events in milliseconds. In this paper, a dynamic calibration using negative going dynamic pressure is proposed to determine dynamic pressure response for piezoelectric sensors. Sensitivity and linearity of sensor by the dynamic calibration were compared with those by the static calibration. The uncertainty of calibration results and the goodness of fit test of linear regression analysis were presented. The results show that the dynamic calibration is applicable to determine dynamic pressure response for piezoelectric sensors.
A High-Speed Image Processing Algorithm Based on Facet Filter for Small Missile Detection
Kim, Ji-Eun ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 4, 2009, Pages 500~507
This paper presents a novel method which can detect a target in IR image for active protection system. The target in IR image for the active protection system is small, moreover it moves with enormous speed. The proposed algorithm is comprised of robust clutter rejection methods and target optimized detection algorithms for small target, and an advanced method of selecting a final target position in target area, it can work in some milliseconds. The proposed algorithm provides the active protective system with more correct positions than those of radar, so that helps the active protection system can defense all threats with the utmost precision.
A Method of Velocity Compensation of Target for the Naval Radar System
Cho, Won-Min ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 4, 2009, Pages 508~515
In the naval environment, a naval radar has many obstructions of velocity, such as rotation and velocity of ship. In the common situation, the rotations such as roll, pitch and yaw don't influence the velocity of the target. But because the naval radar is located on the top of the mast, there is some influence to the target velocity. When we trace the target, radar controller doesn't use hits whose doppler banks are zero. So, we must compensate the target velocity for the velocity error. This paper suggests a method of velocity compensation of target by the velocity vector and how to apply to the stack beam radar if we don't know the height of the target.
Classification of Binary Obstacle Terrain Based on 3D World Models for Unmanned Robots
Jin, Gang-Gyoo ; Lee, Hyun-Sik ; Lee, Yun-Hyung ; Lee, Young-Il ; Park, Yong-Woon ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 4, 2009, Pages 516~523
Recently, the applications of unmanned robots are increasing in various fields including surveillance and reconnaissance, planet exploration and disaster relief. To perform their missions with success, the robots should be able to evaluate terrain's characteristics quantitatively and identify traversable regions to progress toward a goal using mounted sensors. Recently, the authors have proposed techniques that extract terrain information and analyze traversability for off-road navigation of an unmanned robot. In this paper, we examine the use of 3D world models(terrain maps) to classify obstacle and safe terrain for increasing the reliability of the proposed techniques. A world model is divided into several patches and each patch is classified as belonging either to an obstacle or a non-obstacle using three types of metrics. The effectiveness of the proposed method is verified on real terrain maps.
Automatic Image Registration Based on Extraction of Corresponding-Points for Multi-Sensor Image Fusion
Choi, Won-Chul ; Jung, Jik-Han ; Park, Dong-Jo ; Choi, Byung-In ; Choi, Sung-Nam ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 4, 2009, Pages 524~531
In this paper, we propose an automatic image registration method for multi-sensor image fusion such as visible and infrared images. The registration is achieved by finding corresponding feature points in both input images. In general, the global statistical correlation is not guaranteed between multi-sensor images, which bring out difficulties on the image registration for multi-sensor images. To cope with this problem, mutual information is adopted to measure correspondence of features and to select faithful points. An update algorithm for projective transform is also proposed. Experimental results show that the proposed method provides robust and accurate registration results.
The Incapacition Method of Power System Assessing Transient Stability Index and Voltage Drop/Rise Duration Index
Lim, Jae-Sung ; Kang, Hyun-Koo ; Kim, Taek-Won ; Moon, Seung-Il ; Lim, Wan-Khun ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 4, 2009, Pages 532~539
When assailing some area, it is important to consider targeting power system. This paper describes effective method that power networks are incapacitated based on assessing TSI and VDI. For this, we compose realistic scenario and analyze the simulation results in a view of stability. The simulation results show the destruction effects when occur the contingency in the specified area. To perform this process, the simulation tool PSS/E and DSAT are used.
A Study on the Control of Multi-Input Hydraulic System for Robot Leg using LQR Technique
Yoo, Sam-Hyeon ; Lim, Soo-Chul ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 4, 2009, Pages 540~547
In the near future, military robots are likely to be substituted for military personnel in the field of battle. The power system of a legged robot is considerably more complex than the one used for a land vehicle because of the coordination and stability issues due to the large number of degree of freedom. In this paper, a servovalve-piston combination system for a straight-line motion of robot leg is modeled as three degree of freedom based on double inputs and single output transfer function. The output is the displacement of piston from neutral. The inputs are valve displacement from neutral and arbitrary load force in this system. LQR(Linear Quadratic Regulator) technique is applied in order to achieve robust stability and fast responses of the system. The Kalman filter loop, rejection of disturbance and noise, riccati equation, filter gain matrix, and frequency domain equality are analyzed and designed.