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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
Journal Basic Information
Journal DOI :
The Korea Institute of Military Science and Technology
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Volume & Issues
Volume 7, Issue 4 - Dec 2004
Volume 7, Issue 3 - Sep 2004
Volume 7, Issue 2 - Jun 2004
Volume 7, Issue 1 - Mar 2004
Selecting the target year
A Study on Fuzzy Interacting Multiple Model Algorithm for Maneuvering Target Tracking
Kim Hyun-Sik ; Kim Jin-Soek ; Hwang Soo-Bok ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 4, 2004, Pages 5~12
The tracking algorithm based on the interacting multiple model(IMM) requires a considerable number of sub-models for the various maneuvering targets in order to have a good performance. But it is not feasible to use the nm algorithm in the real system because of the computational burden. Therefore, we need an algorithm which requires less computing resources while maintaining a good performance. In this paper, we propose a fuzzy interacting multiple model algorithm(FIMMA) for the tracking of maneuvering targets, which uses a minimal number of sub-models by considering the maneuvering properties and adjusts the mode transition probabilities by using the mode probability as a fuzzy input. In order to verify the performance of FIMMA, the developed algorithm is applied to the tracking of i borne targets. Simulation results show that the FIMMA is very effective in the tracking of maneuvering targets.
A Design of Signal Transport System with High Reliability in an Underwater Sensor Array
Son Dong-Hwan ; Chung Hyun-Ju ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 4, 2004, Pages 13~19
A system for detecting underwater target demands a high operational reliability because of the difficulty of maintenance and repair when the system has a few troubles during long operating period. Therefore, in this paper, we have proposed a signal transport system with a high reliability in an underwater sensor array system composed of magnetic and acoustic sensors. In this system, the nodes for signal transport are connected dually each other with single-hop construction and a magnetic sensor is connected to a couple of neighboring nodes. This enables the output signal to transport from a node to the next node and the next but one node. Also, the signal from a magnetic sensor can be transported to two nodes at the same time. Thus, the system with this construction makes possible to transport sensor data to another node which works normally when a transport node or cable have some faults and will operate normally although it happens some problems in a few signal transport nodes and connection cables.
Development of Flight Antennas for Micro Aerial Vehicle
Kim Duck-Hwan ; Lee Kyu-Hwan ; Kim Young-Sik ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 4, 2004, Pages 20~25
The existing antenna that equipped with Micro Aerial Vehicle, microstrip antenna only can send and receive image signal because of limited bandwidth. But, proposed antenna that equipped with Micro Aerial Vehicle flight introduces tapered type patch antenna, also improves bandwidth then can transfer present location, altitude, movement speed. Furthermore, as a result of introduce stacked type, it transfers more quality of image signal, and represents most suitable performance in Korean peninsula that has many mountain peaks. In this paper, to transmit and receive the wideband signals with a antenna system, the wideband microstrip antenna is proposed and designed. This antenna operates at 2.4GHz. In this thesis, the resonance frequency of 2.4GHz and the reflective loss of the antenna of -22dB were calculated by measuring the fabricated Tapered Microstrip Patch Antenna which was designed with the resonance of 2.4GHz. The calculated gain and efficiency of antenna were 6.7dB and
respectively. The characteristic of the bandwidth shows with
at the basis of -l5dB reflective loss. The experimental results can be used in the characteristic of the resonators and this antenna produces a greatly enhanced bandwidth.
The Study on the Grade System and the Grading Criteria of Ammunition Stockpile Test Procedures
Yoon Keun-sig ; Kwon Tag-man ; Park Byung-chan ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 4, 2004, Pages 26~35
The ASTP is the standard of the assessment ASRP that is monitoring the performance, reliability and safety characteristics of the ammunition items. The ASTP used in domestic now has applied to US Army's grade system and grading criteria so that it cause some problems. To resolve these problems of ASTP, we surveyed both the quality level of production and the field management of ammunition, which compared with grade system and classification criteria. As a result of study, we changed grade system from four steps to three steps and applied the Korean Military Specifications and the Malfunction Criteria to the classification criteria of grades. We are looking forward to improving the reliability and effectiveness of ASRP assessment by simplifying grade system and generalizing grading criteria of ASTP.
A experimental study for the characteristics of impulse noise caused by shooting of K-7 silenced assault rifle
Lee Jin-Ho ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 4, 2004, Pages 36~43
In 1909 Hiram P. Maxim invented one of the first metal silencers for reducing sound levels in firearms. Silenced me have been mainly applied in the hunting and military operation. In particular special force make use of silenced rifle because it is low sound level. This paper considers experimental analysis for the characteristics of shock wave caused by shooting of a silenced me. Experimental results Indicate that the sound level of K-7 silenced rifle was lower than the sound level of MP5 silenced rifle. And, Sound Power Level of K-7 silenced rifle at a distance more than 75m or loom have nearly the constant value. This results that suggested the characteristics data about K-7 rifle's impulse noise will be apply to design the silencer of a small arms.
A Study on the Application of M&S in the T&E of Weapon Systems
Choi Seok-Cheol ; Kim Sung-Kyue ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 4, 2004, Pages 44~52
The test and evaluation(T&E) of weapon systems is a significant activity in the decision-making process of defense acquisition program, providing the data of trade-off analysis, risk reduction and readiness to advance to next phase of development for the decision-maker. Currently, the modeling and simulation(M&S) is being a critical method in the test and evaluation of weapon systems. Therefore in this paper we review the current status of the test and evaluation for the defense acquisition program in Korea, and suggest an application of M&S in the T&E of weapon systems.
The Design of the Ka-band Lens Antenna for Navigation Radar on Helicopter
Moon Sang-Man ; Kim Hyounk-Young ; Kim In-Kyu ; Lee Sang-Jong ; Kim Tae-Sik ; Lee Hee-Chang ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 4, 2004, Pages 53~60
In this paper, the radar antenna of navigation radar on helicopter was suggested to Ka-band lens antenna. It is type of the streamlined convex lens to reduce the air resistivity when helicopter was navigated. Although aperture area is smaller than the standard antenna just like horns, the gain is higher and beamwidth is smaller than standard horns. We made the lens by using maximum flare angle of the horn and dielectric constant of the lens. As a result, when aperture diameter was 280mm and focal length was 145mm, the return loss -21.25dB, the gain was 32.2dBi, E and H beamwidth was
, and side-lobe level was -18.4 dB(E-plane), -19.5dB(H-plane) lower were presented. So this suggested type can be used for the radar antenna of navigation radar on helicopter, and it will possible just a little some sidelobe suppression by using the choked horn as a feeder horn.
A New Analytical Method for Location Estimation Using the Directional Data
Lee Ho-Joo ; Kim Yeong-Dae ; Park Cheol-Sun ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 4, 2004, Pages 61~69
This paper presents a new analytical method for estimating the location of a target using directional data. Based on a nonlinear programming (NLP) problem formulated for the line method, which is a well known algorithm for two-dimensional location estimation, we present a method to find an optimal solution for the problem. Then we present a two-stage method for better location estimation based on the NLP problem. In addition, another two-stage method is presented for location estimation problems in which different types of observers are used to obtain directional data based on the analysis of the maximum likelihood estimate of the target location. The performance of the suggested method is evaluated through simulation experiments, and results show that the two-stage method is computationally efficient and highly accurate.
Prediction of Microstructure During High Temperature Forming of Ti-6Al-4V Alloy
Lee You Hwan ; Shin Tae Jin ; Park No Kwang ; Shim In Ok ; Hwang Sang Moo ; Lee Chong Soo ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 4, 2004, Pages 70~78
A study has been made to investigate the high temperature deformation behavior of Ti-6Al-4V alloyand to predict the final microstructure under given forming conditions. Equiaxed and
microstructures of Ti-6Al-4V alloys were prepared as initial microstructures. By performing the compression tests at high temperatures
and at a wide range of strain rates
, various parameters such as strain rate sensitivity(m) and activation energy(Q) were calculated and used to establish constitutive equations. When the specimens were deformed up to strain 0.6, equiaxed microstructure did not show any significant changes in microstructure, while
microstructure revealed considerable flow softening, which was attributed to the globularization of a platelet at the temperature range of
and at the strain rate range of
. To predict the final microstructure after forming, finite element analysis was performed considering the microstructural evolution during the deformation. The grain size and the volume fraction of second phase of deformed body were predicted and compared with the experimental results.
Real Time Image Processing of Thermal Imaging System
Hong Seok Min ; Yu Wee Kyung ; Yoon Eun Suk ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 4, 2004, Pages 79~86
This paper has presented to the design results of the analog and digital signal processor for the 2nd generation thermal imaging system using
infrared focal plane array In order to correct non-uniformities of detector arrays, we have developed the 2-point correction method using the thermo electric cooler. Additionally, to enhance the image of low contrast and improve the detection capability, we developed the new technique of histogram processing being suitable for the characteristics of contrast distribution of thermal imagery. Through these image processing techniques, we obtained a high qualify thermal image and acquired good result.
Expression Patterns of P21-Activated Kinase 2 by Sterne Spores on Human Macrophages
Seo Gwi-Moon ; Jung Kwang-Hwa ; Kwak Hyun Jung ; Kim Seong-Joo ; Kim Ji-Chon ; Chai Young-Gyu ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 4, 2004, Pages 87~90
In order to elucidate the mechanism of infection on human macrophages, we peformed the 2-dimensional electrophoresis and the western blot analysis using the infected human macrophages with the spores of live and inactivated Sterne. We confirmed P21-activated kinase 2 protein which related to cell death(apoptosis) human macrophages at the early stage events. The inhibition of the P21-activated protein kinase 2 protein will be reduced apoptosis on infected human macrophages with Sterne spores.
Comparative Analysis on Laser Material and Saturable Absorber for Compact Lightweight
Park Do-Hyun ; Oh Seung-Il ; Bae Hyo-Wook ; Kim Dae-Sung ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 4, 2004, Pages 91~99
Laser materials for eyesafe wavelength generation and Q-switching crystals for short pulse operation were studied and compared with each other. Er,Yb:phosphate glass as a laser material and
as a saturable absorber were found to be an effective pair for a compact, light-weight passively Q-switched eyesafe laser operation. Simplified rate equation was used to estimate pulse parameters of the diode-pumped passively Q-switched laser.
Effects of Temperature and Mass Flux on Deuterium Fluoride Chemical Laser Performance
Park Byung-Suh ; Lee Jung-Hwan ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 4, 2004, Pages 100~106
The effects of adiabatic flame temperature and mass flux on deuterium fluoride(DF) chemical laser performance were investigated. The power flux and specific power, which are important parameters containing the information of scaling effects of laser device magnitude, and chemical efficiency were selected as a judging parameter of DF laser performance. For the specific power, it was decreased by the increase of power flux of DF laser. Higher the adiabatic flame temperature of atomic fluorine generator, higher the chemical efficiency of DF laser was changed. It seems that the mass flux effect on the chemical efficiency is not remarkable.
Experiments of Mixed Dynamic Stiffness of a Control Fin and Actuator and Correction of Experiment Results
Shin Young-Sug ; Hwang Cheol-Gyu ; Yang Hae-Seok ; Lee Yeol-Wha ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 4, 2004, Pages 107~113
In order to model a connection part between a control fin and actuator, the related characteristics of a dynamic stiffness were extracted from experiments. These characteristics include the static stiffness of a control fin and the dynamic stiffness of an actuator, so they are called the mixed dynamic stiffness here. This mixed dynamic stiffness is used as the boundary condition of a control fin connected to an actuator when the flutter characteristics are analyzed. The simulated stiffness of an actuator is corrected from the experiment results and the mixed dynamic is finally formulated in the domain of frequencies.
Vibration Analysis of A Rotating Cantilever Blade with Multiple Concentrated Masses with an Elastically Restrained Root
Yun Kyung-Jae ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 4, 2004, Pages 114~124
In this paper, we have proposed a novel method which can analysis a rotating elastically restrained blade with concentrated masses located in an arbitrary position. 1:he equations of motion are derived and transformed into a dimensionless form to investigate general phenomena. For the modeling of the multi-concentrated masses, the Dirac delta function is used for the mass density function. Simulation results show that the vibration characteristics of elastic restrained blade of according to dimensionless variables for example, multiple masses magnitude and mass location ratio. This method can be applied to an practical rotating blade system required to more accurate results.
A Study on the Pressure Increase due to the Foam Left in the Radial Slot of Propellant Grain
Kim Jong-Yul ; Jung Gyoo-Dong ; Yang Jun-Seo ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 4, 2004, Pages 125~132
The radial slot configuration in the solid propellant grain is usually fabricated by the polyurethane foam slot former The foam cannot be easily removed from the solid propellant, some can remain in the slot. Analogue solid propellant rocket motors using polyurethane foam to shape the slot are static fired with the foam former still in place in the slot. The pressure increases at the slot part are measured and there are indications of the propellant cracks at the insulations above the slot. The pressure increase is produced at the beginning of the burning sequence as the foam will hinder the combustion gas of the burning propellant from flowing into the central bore. The pressure increase up to about 300psi is predicted for the motor tested and this pressure increase depends on the gap between the propellant and foam surfaces and remaining foam volume. This amount of pressure increase inside of the slot is estimated to cause the propellant crack. To prevent this pressure increase, minimizing the foam remainder in the slot and making sufficient chamfering at the comer of the slot entrance are suggested.
A Study of Simplified Test Rig for High Altitude Simulation
Lee Ji-Hyung ; Oh Jong-Yun ; Park Ik-Soo ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 4, 2004, Pages 133~137
A simplified test rig to simulate high-altitude environments was designed by analyzing the AEDC (Arnolds Engineering Development Center) report regarding simulated altitude testing. The test rig consists of a vacuum chamber, a supersonic nozzle connected to a cold-gas supplier and a diffuser. The preliminary tests were conducted to validate the AEDC design concepts. The test results showed that sub-atmospheric pressure(1.0psia) environments were realized inside the vacuum chamber and the design concepts were confirmed.
Experimental Study of High-Altitude Simulation using Small-Scale Supersonic Diffuser
Lee Ji-Hyung ; Oh Jong-Yun ; Byun Jong-Ryul ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 4, 2004, Pages 138~145
Experimental study was conducted on cylindrical supersonic diffuser in order to investigate the effects of the ratios of diffuser area to nozzle throat area (Ad/At), diffuser area to nozzle exit area (Ad/Ae), nozzle exit area to its throat area (Ae/At), and diffuser length to its diameter (L/D), the free volume of vacuum chamber, and the relative distance between nozzle exit and diffuser inlet on the diffuser performance. The study showed that the minimum diffuser starting pressure (Po/Pa)st increased monotonically with increase in (Ad/At) as predicted by the normal shock and momentum theory models and the volume of vacuum chamber affected vacuum pressure level during diffuser operation at lower value of (Ad/Ae). The results of this investigation will be utilized in the design of real-scale high-altitude simulation test facility.