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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 4, Issue 2 - Dec 2001
Volume 4, Issue 1 - Jul 2001
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Minimum Weight Design Method for Infantry Fighting Vehicles Hull using Thick Composite Laminate
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 9~16
In this paper, general design process for Tracked Fighting Vehicle has been suggested. Stress analysis and optimal design for ply angle of IFV's composite upper hull has been calculated using KMA CIFV and it is contained exploratory development of design process. In this point, this paper applied composite to IFV's upper hull. Finite element mesh has been made using Matlab program, and we have analyzed stress based on the given material properties and ply arrangement. For each load condition, load distribution in plane and failure index are calculated by using Tasi-Hill criterion, which is composite failure criterion and analyzing change of failure index as change of ply angle. Finally, optimal ply angles of upper hull are calculated using KMA CIFV. We can estimate the decrease of weight for IFV's upper hull.
Obstacle Avoidance for AUV using CAPM
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 17~29
In this paper, we designed the hybrid path generation method which is named CAPM(Continuous path generation method based on artificial Potential field) that is able to be used in the obstacles environment. This CAPM was designed so that it puts together two obstacle avoidance algorithm-the continuous path generation method(CPGM) and the artificial potential field method(APFM). Here, the CAPM generate the safety path using continuous path curvature. But, this method has demerits when used in obstacles environment in which are closely located. Another method which is named the APFM generates the path with the artificial potential field in the obstacles environment. But, It has local minima in certain places and unnecessarily calculates the path in which obstacles are not located. So, the CAPM was designed for autonomous underwater vehicle(AUV) obstacle avoidance. As the result of simulation, it was confirmed that the CAPM can be applied to a safe path generation for AUV.
A Study on a Intelligence Depth Control of Underwater Flight Vehicle
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 30~41
In Underwater Flight Vehicle depth control system, the followings must be required. First, It needs a robust performance which can get over the nonlinear characteristics due to hull shape. Second, It needs an accurate performance which has the small overshoot phenomenon and steady state error to avoid colliding with ground surface and obstacles. Third, It needs a continuous control input to reduce the acoustic noise. Finally, It needs an effective interpolation method which can reduce the dependency of control parameters on speed. To solve these problems, we propose a Intelligence depth control method using Fuzzy Sliding Mode Controller and Neural Network Interpolator. Simulation results show the proposed control scheme has robust and accurate performance by continuous control input and has no speed dependency problem.
Crack Growth Retardation Behavior in Aluminium 2024-T3 Alclad Alloy by Pre-Indentation
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 42~51
The effects of pre-indentation technique are presented for A12024-T3 Alclad alloy using as skin material for aircraft fuselage and wing. Indentations were applied to specimens to be placed on the presumed path of fatigue crack growth before fatigue tests. Tension-tension fatigue tests were conducted on the edge cracked specimens in the L-T orientation. Test results were analyzed to investigate the effectiveness of pre-indentation with the variation of specimen's thickness, position of indentation and applied maximum stress. Fatigue crack retardation by pre-indentation is well recognized in the various conditions.
Study on Applying GPS Positioning Technique to Cannon Laying
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 52~59
In this paper, we have proposed a capability of applying Global Positioning System(GPS) to cannon laying. High precision GPS positioning can be used for measuring precise positions and angles. Therefore, we have tested on applying GPS positioning technique to measurement of positions and angles, which related to cannon laying. First of all, we have determined a GPS reference position using various positioning methods. Then we have carried out several tests that are process of taking corner angles between neighboring two vectors. Each vector can be calculated by post/real time positioning of two GPS antennas placed on the both ends of the howitzer. The Comer Angles from Post processing(CAP) are compared with the other Corner Angles from Real time positioning(CAR). As the results, we have an agreement between CAP and CAR within 0.25 mil average, 0.29 mil standard deviation. Finally, we have discussed about the capabilities and problems in artillery arrangement using GPS.
Realization of a SDINS Transfer Alignment Algorithm and Performance Evaluation using FMS
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 60~69
A Study on The Korean Climatic Condition for The Military Environmental Testing Specification.
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 70~83
The required standards for environmental tests for communication and electronic equipment used currently in the army are not standards into which the Korean climate and use environment are taken into consideration. But the environmental testing standards of the U.S. army at the time of its establishment(MIL-STD-810) “A” version has been used without taking into consideration the Korean domestic situation and conditions by simply translating the US standards. Adherence to these standards may limit the ability to supply materials in case of emergency since the increase in the manufacturing costs according to excessively strict standards induces an increase in the acquisition cost of military equipment, unnecessarily high maintenance and repair expenses are consumed, and stocks of parts for the military use have to be retained at all times.
A Method of Applying Multitier Structures for Underwater Acoustic Multimedia Database System
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 84~96
Test data for a naval vessel is massive, expensive and impossible to be retested in a underwater acoustic measurement on the same condition. So, it is very important. In this paper, I mention massive underwater acoustic multimedia database system that was developed to store a long time, manage systematically, supply raw data and analyze data to user in 2-tier structure. Also, I propose 3-tier structure to extend the current database system that can supply multimedia data.
A Study on the Improvement of the policies and systems related to Performance Specification
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 97~104
Performance specifications leave out unnesessary “how to” or detail and give the manufacturer latitude to determine how to best meet our stated needs. This will increase MND's access to commercial, state-of-the-art technology. However, we find that it is too early to expand the use of performance specification due to the poor domestic infrastructure. To expand the use of performance specification in defense area, this paper suggests the basic principles about which items we should select and which procedeure we should follow.
Cryptanalysis of Shrinking Generator by Golomb's Randomness Postillate
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 105~111
The shrinking generator is simple and stateable, and known that has good security properties. The bits of one output(
) are used to determine whether the corresponding bits of the second output will be used as part of the overall keystream. Two LFSRs consisting the generator generate pseudorandom sequences satisfying Golomb's postulates. We used this property to analyze the stream of LFSR
of the generator.
A Study on the Needs and Approaches for the “Koreanization” of Foreign Standards Referenced in the Dual-Use Standards - Including Case Study with Dual-Use Standards for Bolts -
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 112~121
From the beginning of 1990s, the leading countries, especially United States, are trying to develop dual-use technology which can be used for both military and commercial purpose, and to improve the efficiency of management system in logistics and procurements. Considering the global trends, Department of Defence has been seeking for solutions as to how to reform military specifications, and launched specification unification projects. As a result of the project, a series of dual-use standards for hardwares are being developed in the form of Korea Industrial Standards(KS standards). However, there are many of foreign standards, which are not readily interpretable by users, referenced in the standards. In this study, needs for the conversion of referenced foreign standards to KS standards are reviewed and the appropriate approaches as to the conversion are suggested.
Analysis of Symmetric Coupled Line with New Crossbar Embedded on Si-based Lossy Structure using the FDTD Method
Kim, Yoonsuk ;
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 122~129
A characterization procedure for analyzing symmetric coupled MIS(Metal-Insulator-Semiconductor) transmission line is used the same procedure as a general single layer symmetric coupled line with perfect dielectric substrate from the extraction of the characteristic impedance and propagation constant for even- and odd-mode. In this paper, an analysis for a new substrate shielding symmetric coupled MIS structure consisting of grounded crossbar at the interface between Si and SiO2 layer using the Finite- Difference Time-Domain(FDTD) method is presented. In order to reduce the substrate effects on the transmission line characteristics, a shielding structure consisting of grounded crossbar lines over time-domain signal has been examined. Symmetric coupled MIS transmission line parameters for even- and odd-mode are investigated as the functions of frequency, and the extracted distributed frequency- dependent transmission line parameters and corresponding equivalent circuit parameters as well as quality factor for the new MIS crossbar embedded structure are also presented. It is shown that the quality factor of the symmetric coupled transmission line can be improved without significant change in the characteristic impedance and effective dielectric constant.
A Study on the Aluminium Based Raw-material Specifications Unification
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 130~137
In order to actively cope with international changes such as cessation of the Cold War in the twentieth century, the government has been proceeding the unification project between military and commercial specification leading to cost reduction of military supplies as well as to high effectiveness. Among these efforts, the study on raw materials specifications, which seems to have been widely used for military or commercial fields, has been performed. As the result of these studies, we have reformed military standards through surveying and summarizing military, KS and international specifications on raw materials. Consequently, the reduction of costs for the procurement of military supplies and the maintenance of current military specifications is to be expected.
An Identification Technique of a Target Signal under ECM Environments
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 138~146
The guided missile carries its own tracking radar to detect its target under noisy environments. The enemy warship uses the anti-missile electric-countermeasure(ECM) technique, such as chaff or decoy, so that the approaching guided missile could not destroy it. In this paper we propose the identification algorithm of a target signal when the enemy warship uses the chaff and decoy to deceive the guided missile. In the proposed scheme the mean square errors(MSE) between the received signals and the reference decoy signal, and between the received signals and the reference chaff signal are calculated. Then, the received signal which results in the maximum MSE is regarded as a warship signal. The performance of the proposed algorithm is verified through the computer simulation.
A Robust Attitude Control Scheme Based on Eigenaxis Rotation for Spacecraft
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 147~156
In this paper, a robust attitude control scheme based on Eigenaxis rotation for the spacecraft is proposed. Eigenaxis rotation transforms the attitude of spacecraft to the shortest path and is represented by quaternion. The control law consists of PD-type control part for the nominal system and the robust control part for compensating inertia uncertainty. For the proposed controller, stability analysis is performed and the performance is shown via computer simulation.
Nonlinear Control of High Precision Pointing Stabilization Systems with Heavy Loads
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 157~178
In this paper, the nonlinear control of high precision pointing stabilization system using feedback-linearization design methodology based on system parameter identification is discussed. Modern nonlinear servomechanism theory is adapted to cope with the hard nonlinearities inherent in the turret system. The mathematical models of electrical turret driving system to develop a high performance control algorithm are derived, and the parameter estimation algorithm identifying the unknown system parameters such as vicious and coulomb frictions, stiffness and inertia is developed. Through computer simulation and experiments, it is shown that pointing and tracking accuracy and stabilization against the wideband stochastic disturbance induced by vehicle running on the bump course are improved. Therefore, it is considered the proposed nonlinear control technique is effective in counteracting the nonlinearities and disturbances.
Sliding Mode Control for an Actuation System using BLDC Motor
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 179~188
The objective of this paper is to design and implement sliding mode control scheme for an actuation system using BLDC motor. Since the dynamic characteristics of this system with unknown disturbance and parameter variations are very complicated and highly nonlinear, the conventional linear control approaches may not guarantee satisfactory control performances. In order to improve the dynamic performances of this system, a model following sliding mode control(MFSMC) with perturbation estimation approach is designed and implemented. It eliminates the conventional requirements for the knowledge of uncertainty upper boundary. The effectiveness of this control approach is verified by comparison with a PID control through a series of simulation and experimental studies.
A Terminal Ballistic Performance Prediction of Multi-Layer Armor with Neural Network
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 189~201
For a design of multi-layer armor, the extensive full scale or sub-scale penetration test data are required. In generally, the collection of penetration data is in need of time-consuming and expensive processes. However, the application of numerical or analytical method is very limited due to poor understanding about penetration mechanics. In this paper, we have developed a neural network analyzer which can be used as a design tool for a new armor. Calculation results show that the developed neural network analyzer can predict relatively exact penetration depth of a new armor through the effective analysis of the pre-existing penetration database.
A numerical study on the chemically reacting flow at highly altitude
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 202~214
In this paper the upwind flux difference splitting Navier-Stokes method has been applied to study quasi one-dimensional nozzle flow and axisymmetric sphere-cone(
) flow for the perfect gas, the equilibrium and the nonequilibrium chemically reacting hypersonic flow. The effective gamma(
), enthalpy to internal energy ratio was used to couple chemistry with the fluid mechanics for equilibrium chemically reacting air. The influences of the various altitude(30km, 50km) at Mach number(15.0, 20.0) were investigated. The equilibrium shock position was located farthest downstream when compared with those of perfect gas in a quasi one-dimensional nozzle. The equilibrium shock thickness over the blunt body region was much thinner than that of perfect gas shock.
Investigation of Vortex Interactions over a Delta Wing with the Leading Edge Extension
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 215~224
An experimental investigation was conducted on the interaction of vortices over a delta wing with the leading edge extension for three angles of attack(
) at Reynolds number of
The experimental data included total pressure contours and velocity vectors using 5-hole probe measurements. Constant total pressure coefficient contours show the LEX vortex moves downward and outboard, while the wing vortex exhibited an inboard and upward migration. At near the trailing edge, these vortices reveal a direct interaction between the wing and LEX vortex, featuring a coiling of vortex cores about each other. The combined effect of the interaction of these two vortices and proximity to the wing surface results in the increase of the suction peak. This is in contrast to the result obtained on the delta wing alone configuration, where the effect of the vortex breakdown was manifested. The interaction of the wing and LEX vortices is more pronounced at higher AOA.
Development of a Portable RPV for Short-range Operations
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 227~232
IPresented is a small and handy remotely piloted vehicle(RPV) that can be used for military and non-military surveillance operations. The RPV is equipped with an on-board high resolution color camera to transmit the analog video images and on-board electronics to provide real-time flight information to the pilot, thereby enabling him/her to remotely pilot within the range of 5 km radius. This paper describes the RPV system including its design, manufacturing and flight test results which manifest the stability of on-board mission and flight equipment as well as the remote piloting capability. A future plan for necessary improvements identified from the flight tests are also discussed.
The Synergic Effects of Combat Power on the Netted Battlefield
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 233~242
This paper is a analytical study on the synergic effects of combat power in the netted battlefield. In this work, the relation between the netted battlefield and the uncertainty are described by the command and control system. It is shown that the netted battlefield may reduce the uncertainty in battlefield and increase the combat power
Design and Separation Characteristics of an Explosive Bolt
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 243~248
The present work is described the design factors and separation mechanism of ridge-cut explosive bolt in order to optimize the stage separation characteristics. Characteristics of test samples would differ depend on the detonating devices, the shape and size of bolt body, the amount of loading explosives, and the confinment conditions of bolt. Based on the results from these experimental factors, it appears to optimal condition of ridge-cut explosive that the amount of loading explosive seems to be near 110mg of RDX, the height of loading explosive is 3.5mm, the thickness of bolt is 3.9mm, and the degree of ridge is approximately
A Study on the Intelligent Control Architecture for Unmanned Autonomous Vehicles
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 249~255
Characteristics of Supersonic Nozzle and Jet Impingement
Hong, Seung-Kyu ; Lee, Kwang-Seop ; Sung, Woong-Je ;
Journal of the Korea Institute of Military Science and Technology, volume 4, issue 2, 2001, Pages 256~262
Viscous solutions of supersonic side jet nozzle and supersonic jet impinging on a flat plate are simulated using three-dimensional Navier-Stokes solver. For rapid and abrupt control of a missile in supersonic flight, side jet on a missile body is found to be a useful devise as evidenced by recent missile development at several nations. The magnitude of the side jet and the duration of it decide the level of control of such a missile system. The aerodynamic characteristics of the side jet devise itself are examined in terms of key parameters such as the side jet nozzle geometry, the chamber pressure and temperature. On the other hand, the jet impinging flow structure exhibits such complex nature as shock shell, plate shock and Mach disk depending on the flow parameters. Among others, the dominant parameters are the ratio of the nozzle exit pressure to the ambient pressure and the distance between the nozzle exit plane and the impinging plane. As the plate is placed close to the nozzle, the computed wall pressure at or near the jet center oscillates with large amplitude with respect to the mean value. The amplitude of wall pressure fluctuations subsides as the plate/nozzle distance increases, and the frequency of the wall pressure is estimated on the order of 10.0 KHz. Objectives of this paper are to show accurate simulation of nozzle flow itself and to demonstrate the jet flow structure when the jet interacts with a wall at a close range.