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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 3, Issue 2 - Dec 2000
Volume 3, Issue 1 - Jul 2000
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A derivation of real-time simulation model on the large-structure driving system and its application to the analysis of system interface characteristics
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 13~25
A simulation model is developed to analyze the large-structure driving system and its integrated behavior in the whole weapon system. It models every component in the driving system such as mechanical and electrical characteristics, and it is programmed by simulation language in a way which strongly reflects the system's real time dynamics and reduces computation time as well. A useful parameter identification method is proposed, and it is tuned on the given physical system. The model is validated through comparing to real test, and it is applied to analysis and prediction of integrated system functions relating to the fire control system.
A Study on the Determination for the Economic Life-Time of a Self-Propelled Artillery
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 26~37
This research paper deals with the problem of determining the optimal life time in terms of economical sense for a self-propelled artillery. Equivalent Annual Cost Method(EACM) is used to evaluate the optimal life time, based on the acquisition cost, and the operation and maintenance cost. It is assumed that the operation and maintenance cost includes the costs for spare parts, petroleum and ammunition for training. From the result of this study, the optimal life time for a self-propelled artillery is between 13.9 years and 16.1 years with 95% confidence interval.
Robust Depth and Course Control of AUV Using LMI-based
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 38~46
In this paper, robust depth and course controllers of AUV(autonomous underwater vehicles) using LMI-based H
servo control are proposed. The
servo problem is modified to an
control problem for the generalized plant that includes a reference input mode, and then a sub-optimal solution that satisfies a given performance criteria is calculated by LMI(Linear Matrix Inequality) approach. The robust depth and course controllers are designed to be satisfied the robust stability about the modeling error generated from the perturbation of the hydrodynamic coefficients and the robust tracking property under sea wave and tide disturbances. The performances of the designed controllers are evaluated by computer simulations, and these simulation results show the applicability of the proposed robust depth and course controller.
Development of a Seaborne Towing Winch System
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 47~57
This paper contains the design specification and detail design for a seaborne towing winch system. We analyze operating condition of the system and decide the design specification for the towing winch system, and also perform a detail design for the subsystem such as hydraulic winch system, control equipment and power supplier at the full scale development. The performance of designed towing winch is established by load tests and sea trial tests.
Research on Synthesis of Radiation Noise from Moving Target
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 58~65
A target signal simulation method for passive sonar systems is introduced. The method uses multirate signal processing techniques to simulate moving target signals in the multi-path sound propagation environment by introducing Lloyd's mirror and Doppler effect. Time and frequency variation of target signal due to the target maneuvering is also considered to provide realistic ship signatures in the LOFAR gram so that the simulated target is used for sonar operator training. Synthesized target characteristics is analyzed and compared with real target signal in terms of interference pattern and frequency variation in the LOFAR gram.
A Study on the Trade-off Analysis of Combat Weight for Conceptual design of a Landing Craft Air Cushion
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 66~75
The purpose of this study is to develop and illustrate methods of applying trade-off techniques to landing craft air cushion design evaluation. The problem areas of concern are the application of quantitative analytical methods to conceptual design. The interrelationships between composite system measures and selected performance requirements(speed, cruising range, cargo etc.) are analyzed and the expressions for gross weight are developed as functions of performance parameters. Trade-offs of performance parameters in terms of weight are then calculated. The application of these results to evaluation of Require Operational Capabilities are illustrated.
A Study on the Algorithm for Underwater Target Automatic Classification using the Passive Sonar
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 76~84
As first step of any acoustic defence system, a attacking target warning system needs to be extremely reliable. This means the system must ensure a high probability of target classification together with a very low false alarm rate. In this paper, a algorithms for underwater target automatic classification is available for use in the passive sonar will be presented. In first, we will describe the precise automatic extraction of frequency lines for the detection of acoustic signatures. Also, a neural network and fuzzy based algorithms for target classification will be described. Thus the performances of these algorithms are very good with a high probability of classification.
USBL Underwater Positioning Algorithm using Phase Spectrum
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 85~91
Underwater sensor accuracy test which measures the detection range and bearing accuracies of sonar simulates sonar transmitting ping and underwater radiating noise of target vessels. In this test, because the position of sonar target is the reference position of test, the sonar target position should be precisely estimated. Hence, this paper suggests to apply USBL algorithm which adopts cross phase spectrum of received sensor signals, and presents its performance by range and bearing estimation simulations. As a result of simulations, suggested algorithm shows good accuracy for underwater sensor accuracy test near 5㏈ SNR.
An Analysis of Core Technologies and Acquisition Methodology for Combat Aircraft Powerplants
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 92~105
Core technologies of powerplants, which are necessary for the development of Korean type combat aircraft, are analyzed. And then, the acquisition methodologies for the technologies are proposed. With respect to the aircraft engine design and manufacturing technologies, simple basic technologies such as component manufacturing and assembling technology come to close to those of advanced countries, but the core technologies were not acquired or in the understanding level only. Therefore, the research on the component manufacturing technology should be specialized for buildup of international competition first, and the research on core technologies such as high pressure compressor design, blisk, FADEC and hollow fan blade design should be concentrated step by step by taking an active participation in the development project of international cooperative aircraft powerplants.
Measuring Technique of Burn-out Indices for 2.75″ Rocket Motor
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 106~115
This paper presents the measuring technique of time and velocity when rocket motor is burnt out for 2.751" rocket. This technique use doppler effect, frequency spectrum analysis and curve fitting. In this study, we use muzzle velocity radar for doppler signal acquisition, short-time fourier transform for spectrum analysis and curve fitting for smoothing.
The Structure and Performance of Turbo decoder using Sliding-window method
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 116~126
Turbo codes are the most exciting and potentially important development in coding theory in recent years. They were introduced in 1993 by Berrou, Glavieux and
and claimed to achieve near Shannon-limit error correction performance with relatively simple component codes and large interleavers. A required Eb/N0 of 0.7㏈ was reported for BER of
and code rate of
However, to implement the turbo code system, there are various important details that are necessary to reproduce these results such as AGC gain control, optimal wordlength determination, and metric rescaling. Further, the memory required to implement MAP-based turbo decoder is relatively considerable. In this paper, we confirmed the accuracy of these claims by computer simulation considering these points, and presented a optimal wordlength for Turbo code design. First, based on the analysis and simulation of the turbo decoder, we determined an optimal wordlength of Turbo decoder. Second, we suggested the MAP decoding algorithm based on sliding-window method which reduces the system memory significantly. By computer simulation, we could demonstrate that the suggested fixed-point Turbo decoder operates well with negligible performance loss.
A Development Guide for Robust System Architecting
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 127~137
The term system architecting(SA) is widely used in systems engineering area, however the explicit meaning of the term varies considerably from person to person depending on his expertise and viewpoints. In this paper, we surveyed the range of variations in definitions and present the summary. Additionally, the definition of robust system architecting is suggested along with the associated system architecture guides that can be followed during an architecture development. This guide exposes various viewpoints of architecture such as art side, requirement specification, system view, principles, tools and environment.
A Study on the robust fault diagnosis and fault tolerant control method for the closed-loop control systems
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 138~145
This paper presents a robust fault diagnosis and fault tolerant control method for the control systems in closed-loop affected by unknown inputs or disturbances. The fault diagnostic scheme is based on the disturbance-decoupled state estimation using a 2-stage state observer for state, actuator bias and sensor bias. The estimated bias show the occurrence time, location and type of the faults directly. The estimated state is used for state feedback to achieve fault tolerant control against the faults. Simulation results show that the method has definite fault tolerant ability against actuator and sensor faults, moreover, the faults can be detected on-line, isolated and estimated simultaneously.
An Experimental Study on the Shear Buckling of a Composite Plate with Bead and Hole
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 146~154
Buckling behavior was studied for the square plate with bead and hole under shear load. Plates were made to examine the effect of bead and hole to the material, aluminum and composite, the effect of flange angle, bead height and bead radius of curvature. There was little difference between buckling loads obtained by the experiment and Rayleigh-Ritz method to the plate. Buckling load could be increased highly when stress concentration to the hole was dispersed effectively using flange. A well-designed plate using bead and flange showed 3 times as much as stiffness to the plate without bead and flange.
다층 유전체위의 다중 결합선로에 대한 유한차분법(FDTD)을 이용한 해석
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 155~163
A general characterization procedure based on the extraction of a 2n-port admittance matrix corresponding to n uniform coupled lines on the multi-layered substrate using the Finite-Difference Time-Domain (FDTD) technique is presented. The frequency-dependent normal mode parameters are obtained from the 2n-port admittance matrix, which in turn provides the frequency-dependent distributed inductance and capacitance matrices. To illustrate the technique, several practical coupled line structures on multi-layered substrate, including a three-line structure, have been simulated. It is shown that the FDTD based time domain characterization procedure is an excellent broadband simulation tool for the design of multiconductor coupled lines on multilayered PCBs as well as thick or thin hybrid structures.
A Study on the Hydrolysis of Sarin and Soman by Merrifield-Type Diaminatedpolystyrene-Cu (II) Heterogeneous Polymers
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 164~175
Three compounds of Cu(II)-loaded N,N,N'-trimethylethylenediaminated Merrifield-type polymers were synthesized with yields higher than 80%, and the hydrolysis reaction rates of O-isopropylmethyl-phosphonofluoridate(GB) and O-pinacolylmethylphosphonofluoridate (GD) catalyzed by them have been surveyed. GB and GD hydrolysis by Cu(II)-loaded polymers occurs via intermediate complex mechanism where rapid equilibrium to form intermediate complex between substrate and Cu(II)-loaded polymers(
) is followed by rate determining hydrolysis step(
). The measured activation parameters for
for GB and
for GD. Standard enthalpy/entropy changes corresponding to the intermediate complex formation constant
K for GB and GD, respectively, The electron push-pull mechanism by Cu(II)-loaded polymers lowers the P-F bond breaking energy(~400 kJ/mol) to less than 1/20 compared to the case in which no Cu(II)-loaded resin presents. Analysis of
over pH=6.5~8.0 range suggest that the GB and GD hydrolysis occurs intramolecularily with
=7.29 for ligated
= 7.06 and
=177.7 sec for GB and GD, respectively
Cold Bending of Ti-6Al-4V Large-Diameter Seamless Tube
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 176~182
bending of Ti-6Al-4V large-diameter seamless tube(62.37 mm
wall thickness) has been achieved at room temperature without heating. The bending process comprised two steps : the first step is
bending by an uniquely designed rotary bender allowing spring back, which is subsequently eliminated by the second or finishing step which comprised repeated bending processes by powered three roll bender, In odor to prevent collapse of tube during bending, Cerro
(Trade name of a non-ferrous low melting point alloy)has been employed as a filler metal. The resultant ovality(out of roundness) obtained was 1.28%, as compared with 6~8% without applying Cerro
Conceptual Study of the Future Holonic Weapon System
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 183~190
The concept of Holon was suggested by A. Koestler in his paper(1967) "The Ghost in the Machine." It became one of the central concept of the Intelligent Manufacturing System. In this paper, a new system concept: Holonic Weapon System was introduced. HWS has the advantages of the holonic system and the system integration technique so that the future unmanned combat system should consider this concept.
Tracked Vehicle Vibration Environmental Comparison using Fatigue Damage Spectrum
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 191~197
This paper provides the test results of tracked vehicle at each driving condition and life cycle. Fatigue Damage Spectrum(FDS) has evaluated with the Power Spectrum Density(PSD) and the life time of equipment. Finally, provisional vibration qualification test level is evaluated.
Analysis of Transmission Load for Spur Gear Using Contact Theory
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 198~206
The transmission load of gear devices is important factor in the design of gear system. To design gear system precisely, an analysis and calculation methods for transmission load of gears are demanded. The purpose of this study is to develop a computer program for analyzing tooth load sharing of a spur gear system by means of the contact theory. In this paper, load transmission characteristics is identified with elastic contact problem which is assumed to quasi-static equilibrium. The modeling of spur gear tooth is accomplished by application of I-DEAS.
The study of a fire fighting characteristic by a Single Evaporating Droplet in the case of a fire of military enclosure space
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 207~217
A fire fighting characteristic by a single evaporating droplet in the case of a fire of military enclosure space was studied experimentally. Transient cooling of solid surface by water droplet evaporation has been investigated through controlled experiments using a heated brass cylinder. Quantitative predictions of droplet evaporation time and in-depth transient temperature distribution in solid have been made. The particular interest was in the removal of thermal energy from the heated cylinder by evaporative cooling. A
single droplet is deposited on a horizontal brass surface with initial temperatures in the range of
The results can be summarized as follows; Evaporating droplet was divided into three different configuration. Evaporation time was predicted as a function of initial surface temperature (
The contact temperature was predicted as a function of initial surface temperature(
+1.4), The parameter
was predicted as a function of initial surface temperature(
A Study on the RAM Object Values
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 218~230
In the weapon system development/operation stage, the goals of RAM activities are to support the cost effective performance optimization in design and operation supports. In the study, the main contents are as follows; 1) To establish the operational concept and circumstance of the subsequent tank, the combat/operation scenario, the operational mode summary and mission profile for subsequent tank development are analyzed. 2) To evaluate the administrative and logistics down time for subsequent tank, the prefigured logistics circumstance and maintenance system are analyzed. 3) To calculate the RAM object values, a mathematical model for the user are developed. 4) To examinate the propriety of the RAM object values, the combat readiness are reviewed. The obtained RAM object values are provided to predict and analyze for the combat readiness, staying power, mission reliability, equipment availability and the logistic support capability
The Thinning Phenomena of the Wall Thickness during
Cold Bending of Ti-6Al-4V Large-Diameter Seamless Tube
Journal of the Korea Institute of Military Science and Technology, volume 3, issue 1, 2000, Pages 231~236
The wall thickness of the Ti-6Al-4V Large-Diameter Seamless Tube, which is supposed to be a very important parameter in a system design, was measured during
cold bending processes. The factors or processes affecting the wall thickness include 1) primary bending, 2)secondary or finishing step of the
bending, 3)cleaning processes in CERO TRUTM(CT)process. But thinning effects of the wall thickness during the cleaning processes are negligible compared to those during the formers. The variations in the percentages of the change in wall thickness were found to be from -14% to +16%.