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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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User Interface for Unmanned Combat Vehicle Based on Mission Planning and Global Path Planning
Lee, Ho-Joo ; Lee, Young-Il ; Park, Yong-Woon ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 6, 2009, Pages 689~696
In this paper, a new user interface for unmanned combat vehicle(UCV) is developed based on the mission planning and global path planning. In order to complete a tactical mission given to an UCV, it is essential to design an effective interface scheme between human and UCV considering changing combat environment and characteristics of the mission. The user interface is mainly composed of two parts, mission planning and global path planning, since they are important factors to accomplish combat missions. First of all, mission types of UCV are identified. Based on mission types, the concept of mission planning for UCVs is presented. Then a new method for global path planning is devised. It is capable of dealing with multiple grid maps to consider various combat factors so that paths suitable for the mission be generated. By combining these two, a user interface method is suggested. It is partially implemented in the Dog-horse Robot of ADD and its effectiveness is verified.
The Improvement of Target Motion Analysis(TMA) for Submarine with Data Fusion
Lim, Young-Taek ; Ko, Soon-Ju ; Song, Taek-Lyul ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 6, 2009, Pages 697~703
Target Motion Analysis(TMA) means to detect target position, velocity and course for using passive sonar system with bearing-only measurement. In this paper, we apply the TMA algorithm for a submarine with Multi-Sensor Data Fusion(MSDF) and we will decide the best TMA algorithm for a submarine by a series of computer simulation runs.
Comparison Study of Viscous Flutter Boundary for the AGARD 445.6 Wing Using Different Turbulent Boundary Layer Models
Kim, Yo-Han ; Kim, Dong-Hyun ; Kim, Dong-Man ; Kim, Soo-Hyun ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 6, 2009, Pages 704~710
In this study, a comparison study of flutter analysis for the AGARD 445.6 wing with wind turnnel test data has been conducted in the subsonic, transonic and supersonic flow regions. Nonlinear aeroelastic using FSIPRO3D which is a generalized user-friendly fluid-structure analyses have been conducted for a 3D wing configuration considering shockwave and turbulent viscosity effects. The developed fluid-structure coupled analysis system is applied for aeroelastic computations combining computational structure dynamics(CSD), finite element method(FEM) and computations fluid dynamics(CFD) in the time domain. MSC/NASTRAN is used for the vibration analysis of a wing model, and then the result is applied to the FSIPRO3D module. the results for dynamic aeroelastic response using different turbulent models are presented for several Mach numbers. Calculated flutter boundary are compared with the wind-tunnel experimental and the results show very good agreements.
A Study on the Prediction and Measurement of Afterbody Drag for a Supersonic Aircraft
Kim, Won-Cheol ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 6, 2009, Pages 711~718
During the preliminary design phase of a supersonic aircraft, it is necessary to evaluate many potential engine/airframe combinations to determine the best solution to given set of mission requirements. And it is very important to establish a methodology to predict precisely afterbody drag so that accurate engine installed performance can be estimated. It was carried out in this paper to establish a methodology to predict afterbody drag of F-15K supersonic aircraft based on IMS(Integral Mean Slope) methodology, acquire afterbody drag data and compare its calculated data with the test data acquired from the wind tunnel test data based on 4.7% model scale. The comparison results showed good agreement between the calculated data and test data and it was found that the methodology described here to predict and test afterbody drag is acceptable.
Storage Lifetime Prediction of Zr-Ni Delay System in Fuze K510 for High Explosive Shell
Park, Byung-Chan ; Chang, Il-Ho ; Back, Seung-Jun ; Son, Young-Kap ; Jung, Eun-Jin ; Hwang, Taek-Sung ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 6, 2009, Pages 719~726
A delay system in fuze for high explosive shell is an important safety device, but failure in the delay system usually causes failure of the shell. Root-cause analysis of failure in the delay system is required since failure in over 10-years stored delay system recently occurs. In this paper, failure in the delay system was reproduced experimentally to examine aged characteristics of the delay system, and the failed delay system shows the same characteristics as ones of failed delay systems in field. Based on the reproduced experiments, accelerated life testings and the data analysis of failure times of delay systems were performed to predict the storage lifetime.
Performance Analysis of Emitter Localization Using Kalman Filter
Lee, Joon-Ho ; Cho, Seong-Woo ; Lee, Dong-Keun ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 6, 2009, Pages 727~732
In this paper, the dependence of the Kalman filter-based emitter location algorithm on the initial estimate is investigated. Given all the LOB data, the initial estimate of the emitter location is obtained from the linear LSE algorithm with the former LOB data. Using the initial estimate, the Kalman filter algorithm is applied with the remaining LOB data to update the initial estimate. It is shown that as the number of data used in the calculation of the initial estimate increases, the accuracy of the final estimate is improved and the total computational complexity of obtaining the initial estimate and the final estimate increases. In addition, the dependence of the performance of the Kalman filter algorithm on the predefined constant is illustrated.
The Design and Implementation for Efficient C2A
Kwon, Cheol-Hee ; Hong, Dong-Ho ; Lee, Dong-Yun ; Lee, Jong-Soon ; Kim, Young-Vin ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 6, 2009, Pages 733~738
In this paper, we have proposed the design and implementation for efficient Command Control and Alert(C2A). Information fusion must be done for knowing the state and identification of targets using multi-sensor. The threat priority of targets which are processed and identified by information fusion is calculated by air-defence operation logic. The threat targets are assigned to the valid and effective weapons by nearest neighborhood algorithm. Furthermore, the assignment result allows operators to effectively operate C2A by providing the operators with visualizing symbol color and the assignment pairing color line. We introduce the prototype which is implemented by the proposed design and algorithm.
Functional Gold Nanoparticles
Lee, Jun-Wung ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 6, 2009, Pages 739~749
Ever since gold was found, this element has fascinated human beings. It is stable in air, and is illuminating for several thousands years without changing its colors. Nanoparticles are the basic nanommaterials, and, particularly gold nanoparticles show unique properties which are not shown in bulk states. Scientists are trying to apply these new properties to catalysts, bioscience, optics, etc. Judging from the current research activities, one can envisage that gold nanoparticles can play a major role in opening a new era in diagnoses and treatment of diseases like cancers. However to apply the nanoparticles one must modify the surface of the nanoparticles in order to give the materials certain functionalities. It certainly is worth to review the current research status and challenges in the area of functional gold nanoparticles.
Development of a Geo-Pointing System of Helicopter-Mounted FLIR
Kim, Sung-Su ; Shin, Yong-San ; Kim, Sung-Soo ; Kwon, Kang-Hun ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 6, 2009, Pages 750~759
FLIR(Forward Looking Infrared) geo-pointing is a function that helps pilots to see a target within the field of view under all coordinates and attitudes of helicopter. Geo-pointing controls FLIR LOS(line of sight) toward known target coordinates by using azimuth and elevation angles calculated from several information such as helicopter coordinates and attitudes, a FLIR position from a GPS antenna, and target coordinates. Geo-pointing performance has been tested and evaluated on the ground to save flight test costs and ensure flight safety. In this paper, design and implementation of a geo-pointing system is described with the results of performance test conducted on the ground test system.
A Study on the Characteristics of a 400W, 7.9~8.4GHz Double-Slot Coupled-Cavity Traveling-Wave Tube
Kim, Hyoung-Jong ; Kim, Hae-Jin ; Choi, Jin-Joo ; So, Jun-Ho ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 6, 2009, Pages 760~767
This thesis focuses on the study of high-power, coupled-cavity traveling-wave tube(CCTWT) for radar applications. The CCTWT employed a reentrant double-slot staggered RF cavity structure. Computational analysis of the X-band, double-slot staggered structures is carried out through the use of HFSS code, which solves Maxwell's equations fully in three-dimensions. The non-linear, large-signal performance of CCTWTs are predicted from numerical simulations using a three-dimensional particle-in-cell code, MAGIC3D. With beam voltage set to 12.7~13kV and beam current at 300mA, the CCTWT produces a saturated radiation power of 350~430W, corresponding to an electronic efficiency of 8.9~11.2% and a gain of 23.7~24.2dB within a frequency range of 7.9~8.4GHz.
A Study on Real Time Estimation System of Fire Sound Source Localization
Roh, Chang-Su ; Park, Byung-Su ; Do, Sung-Chan ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 6, 2009, Pages 768~775
In this paper, the sound source localization system in real time which uses the time delay of arrival signal is proposed. This system uses minimum microphones and surveillance camera for estimation of the sound source localization and sound direction. To apply this system to the military field, four models(model1~model4) are derived. Model 1 can be used to evaluate the sound source localization at the long distance. Model2 and model3 can be applied to estimate the sound direction. Model4 is useful for the special purpose and potable device. It is possible for this system to be used for the military guard and surveillance. As a result of experiments, It is shown that this system can estimate the sound source localization and the sound direction using minimum microphones.
DIRCM Jamming Effect Analysis of Spin-Scan Reticle Seeker
Ahn, Sang-Ho ; Kim, Young-Choon ; Lee, Kwang-Sei ; Kim, Ki-Hong ; Kim, Sung-Soo ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 6, 2009, Pages 776~784
The function of DIRCM(Directed Infrared Countermeasures) jamming is to cause the missile to miss its intended target by disturbing the seeker tracking process. The DIRCM jamming uses the pulsing flashes of IR energy and its frequency, phase and intensity have influence on the missile guidance system. In this paper, we analysis the DIRCM jamming effect of spin-scan reticle seeker. Simulation results show that the jamming effect is greatly influenced by frequency, phase and intensity of the jammer signal.
A Study on the Mixed Finite Element Models of Nonlinear Beam Bending Based on the Unconventional Residual Minimizing Method
Kim, Woo-Ram ; Choi, Youn-Dae ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 6, 2009, Pages 785~795
In this paper, new type of finite element models for the analysis of nonlinear beam bending are developed by using unconventional residual minimizing method to increase accuracy of finite element solutions and overcome some of computational drawbacks. Developing procedures of the new models are presented along with the comparison of the numerical results of existing beam bending models.
Swimming Performance of Aquatic-animals and Their Morphological Adaptation
Sohn, Myong-Hwan ; Lee, Seung-Hee ; Han, Cheol-Heui ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 6, 2009, Pages 796~807
The swimming abilities of aquatic-animals are of vital importance to their ecology. The relationship between outer shapes and the swimming ability has been focused just a few centuries ago by engineering community. Present paper surveys the recent studies of the aquatic-animals' swimming performance in the morphological point of view. Also an experimental study is performed in order to investigate the effect of the tail fin's shape on the propulsive performance. The result showed that the morphological study provided valuable data for exploring the secrets of the aquatic-animals' swimming performance.
Numerical Study on the Aerodynamic Behavior of a Projectile with a Triangular Ballute
Yang, Young-Rok ; Jung, Sung-Ki ; Park, Ji-Heok ; Ahn, Sung-Ho ; Kim, Byoung-Soo ; Cho, Tae-Hwan ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 6, 2009, Pages 808~814
Numerical flow-filed computations have been conducted around a projectile with a triangular ballute at Mach numbers of 0.3 ~ 0.9 and angles of attack of
. The expansion shape of a triangular ballute has been determined from both the manufacturing dimensions and the wind tunnel test results. It has been assumed that the shape does not alter after the ballute has been expanded completely. The computed results showed a good agreement with the wind tunnel test results. A sensitivity analysis on the aerodynamic coefficients has been performed to evaluate the quantitative effects on the flight performance. Trajectory simulation results were also in good agreement with the flight test results.