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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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Journal DOI :
The Korea Institute of Military Science and Technology
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Volume & Issues
Volume 14, Issue 6 - Dec 2011
Volume 14, Issue 5 - Oct 2011
Volume 14, Issue 4 - Aug 2011
Volume 14, Issue 3 - Jun 2011
Volume 14, Issue 2 - Apr 2011
Volume 14, Issue 1 - Feb 2011
Selecting the target year
GPS/GLONASS Microstrip Active Antenna Apply to Curve Surface
Kim, Mi-Suk ; Son, Seok-Bo ; Joo, Hahn-Kie ; Bae, Joon-Sung ; Kim, Joon-O ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 1, 2011, Pages 1~8
DOI : 10.9766/KIMST.2011.14.1.001
In this paper, dual-feed circularly polarized microstrip patch antenna for GPS L1, GPS L2, GLONASS L1 signal was fabricated by using stacked patch. It was fed by dual coaxial probe on the patch at 50ohm impedance, and was simulated to resonate at GPS L1, GPS L2, GLONASS L1. To realize characteristics of right hand circular polarization using dual-feed stacked patch antenna and hybrid coupler for
phase difference. Output of hybrid coupler was contacted input of Low Noise Amplifier(LNA). The LNA using dual band pass filter was designed and fabricated. The measured results of the implemented antenna is VSWR < 1.5 : 1 and the gain of 32dB(Zenith) over at GPS L1, L2, GLONASS L1.
ADAMS Simulation on the Scale Model of the FOOB System
Kim, Jong-Hyuk ; Bae, Jae-Sung ; Hwang, Jai-Hyuk ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 1, 2011, Pages 9~14
DOI : 10.9766/KIMST.2011.14.1.009
Due to the improvement of science technology, the future tank system will have the multi-function for more powerful firing. and the tank, mounted this multi-function, must be lighter to maintain the mobility. Therefore, new brecoil technology would be necessary to reduce the recoil force for lighter platform. The present study covers a FOOB(Fire-Out0-Of-Battery) system that can reduce the recoil force dramatically. The firing sequence of the FOOB system is radically different from that of a conventional system. The gun is latched in out-of-battery position prior to firing. As soon as firing is occurred, the gun is unlatched and accelerated. The forward momentum is imparted to the recoiling parts. This momentum is opposed by the ballistic force imparted by firing and the recoil force and recoil length will be reduced. In this study, the ADAMS simulation has been performed with the scale model of the FIB(Fire-In-Battery) system and the FOOB system. The ADAMS simulation results show that the FOOB system could reduce the operating time and recoil length and the recoil force.
A Study on the Analysis for the Strength of Bailey Panel Bridge
Lee, Jong-Woo ; Yoo, Sam-Hyun ; Kim, In-Soo ; Kim, Tae-Yang ; Choi, Hyun-Ho ; Yoon, Woo-Seob ; Kim, Young-Cheol ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 1, 2011, Pages 15~21
DOI : 10.9766/KIMST.2011.14.1.015
In this paper, the results of experimental analysis for the chemical composition and strengh verification of Bailey Panel Bridge have been presented. Some of main sections of bailey bridge colllected from military engineer troops were prepared for the chemical composition and strengh verification. The composition test and strength verification were conducted by using the optical microscope and Scanning Electron Microscope(SEM), Automatic Control Spark Emission Spectrometer(OBLF), X-ray Fluorescence Spectroscopy(XRF) and Instron measurement. The results showed that currently used sections of bailey bridge passed the strength verification and could be operated in drill of troops and battle fields.
Study on Properties of Interior Ballistics According to Ignition-Gas Injections
Jang, Jin-Sung ; Sung, Hyung-Gun ; Lee, Sang-Bok ; Roh, Tae-Seong ; Choi, Dong-Whan ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 1, 2011, Pages 22~29
DOI : 10.9766/KIMST.2011.14.1.022
Using the numerical code for the interior ballistics, the performance of the interior ballistics with the characteristic of the ignition-gas injections has been investigated. The ignition gas has been assumed to be injected into the chamber with 3 cases. As the results of analysis, when the ignition-gas has been injected into all chamber area, the pressure distributions of the chamber of the interior ballistics have been uniform and the differential pressure has been stable. The ignition-gas has been injected into the partial area of the chamber, however, the pressure distributions and the differential pressure have been unstable. The case using the longer ignition injector, therefore, seems to be more suitable to improve the stability of the interior ballistics.
Design and Implementation of Command and Control Systems for Soldiers using Smart Phone
Cho, Joon-Young ; Lim, Man-Yeob ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 1, 2011, Pages 30~38
DOI : 10.9766/KIMST.2011.14.1.030
The modern warfare needs sharing tactical situation and Command and Control(C2) capacity. Lately, developing of C2 System for Soldiers has dramatically increased according to increase of asymmetric state of hostilities like a guerilla war or a street-to-street fighting. In this paper, we explain the concepts of C2 System for Soldiers and Smart Phone. We describe the proposed system composed of HMD equipment, Smart Phone, and exclusive software. This system provides that Soldiers have C2 capacity and share the image of a visual field. It also offers efficient military power disposition and understanding tactical situation in operations.
Range Sensitivity Analysis of a Canard Controlled Missile
Yang, Young-Rok ; Cho, Tae-Hwan ; Myong, Rho-Shin ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 1, 2011, Pages 39~48
DOI : 10.9766/KIMST.2011.14.1.039
This study describes a range sensitivity of a canard controlled missile. An investigation was conducted into the relative importance of aerodynamic parameters on a guided missile. Also this study was analyzed by quantifying their effects on the missile range. To analyze the range sensitivity of a guided missile, a trajectory analysis program of a guided missile was developed. The range sensitivity analysis was conducted on a thrust, weight, drag and lift. The result of the range sensitivity analysis shows that the design parameters with the greatest effect on the missile range are thrust, drag, weight, and lift, in descending order of importance. The thrust on range extension is quite obvious to extend a range of a guided missile. In particular, the drag exhibited greater range sensitivity than lift at a guided flight. The result also shows that missile range could be maximized by applying the appropriate launch angle and canard pitch-up control.
An Attitude Error Estimation Performance Comparison of Tightly Coupled INS/GPS Navigation System using Different Measurements
Yu, Hae-Sung ; Kim, Cheon-Joong ; Yoo, Ki-Jeong ; Lee, Youn-Seon ; Park, Heung-Won ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 1, 2011, Pages 49~54
DOI : 10.9766/KIMST.2011.14.1.049
This paper addresses the performance comparisons of the GPS pseudorange and pseudorange rate measurements in the tightly coupled INS/GPS Navigation systems. Even though the two measurements have the same ability in estimating level attitude errors, pseudorange rate has an advantage in improving estimating heading attitude error performance. The performance of pseudorange and pseudorange rate measurements is compared in numerical simulations and van test.
Bubble Wake Measurement by Acoustic Bubble Spectrometer Generated by Planing Hull at Circulating Water Channel
Shin, Myung-Soo ; Moon, Il-Sung ; Nah, Young-In ; Park, Jong-Chun ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 1, 2011, Pages 55~61
DOI : 10.9766/KIMST.2011.14.1.055
This paper presents bubble wake measurement results generated by the planing hull. The bubble was generated by SNAME TMB model(No. 4876) with hard chine at the CWC(Circulating Water Channel). ABS(Acoustic Bubble Spectrometer) was used to measure bubble wake measurement. The manufactured model is one meter in length and uniform velocity to generate the bubble at CWC is 3m/s, relatively higher speed than conventional hull form. Measurements were performed successfully and measured results show well the general characteristics of bubble wake generated by planing hull. Furthermore, experimental equations are proposed for the practical use.
Slosh & Vibration Qualification Test for Fuel Tank of Rotorcraft
Kim, Hyun-Gi ; Kim, Sung-Chan ; Lee, Jong-Won ; Hwang, In-Hee ; Jang, Ki-Won ; Jun, Pil-Sun ; Jung, Tae-Kyung ; Ha, Byung-Kun ; Lee, Gui-Cheon ; Shin, Dong-Woo ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 1, 2011, Pages 62~68
DOI : 10.9766/KIMST.2011.14.1.062
Rapid turning and accelerated movement of a rotorcraft leads to the slosh and vibration effect of fuel in the fuel tank. Due to the slosh load, the internal component of a fuel tank can be broken and fuel tank skin can be damaged. This is directly related to human survivability. Military specification(MIL-DTL-27422D) requires the verification of the stability of aircraft fuel tank and internal component against slosh & vibration load through the qualification test. This report shows the establishment of slosh and vibration test facility and KUH fuel tank qualification test result.
AJ Performance of the FH-CSS(Frequency Hopped - Chirp Spread Spectrum) Communication Systems
Kim, Sung-Ho ; Kim, Young-Jae ; Hwang, Seok-Gu ; Jo, Byoung-Gak ; Shin, Kwan-Ho ; Kim, Nam ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 1, 2011, Pages 69~73
DOI : 10.9766/KIMST.2011.14.1.069
In the defence wireless communications, conventional Anti-Jamming techniques(Frequency Hopping/Spread Spectrum or Direct Sequence/Spread Spectrum) are used to overcome a intentional interfering signals which are single/multitone or partial band jammer etc. DS/SS techniques is very strong on tone jamming signal but not to be on a partial band jammer. So FH/SS AJ performances are expected method of an substitution of DS/SS, however FH/SS could not have good performance on some BMTJ(Band Multi-tone Jammer). So this paper proposes FH-CSS (Frequency Hopped - Chirp Spread Spectrum) to get more robustness against jammers(BMTJ, PBNJ) and analyze the AJ performances.
An Architecture Design of Military Operation System Utilizing Cellular Networks
Kim, Jae-Cheol ; Kim, In-Taek ; Park, Jong-Bum ; Jung, Chang-Uk ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 1, 2011, Pages 74~83
DOI : 10.9766/KIMST.2011.14.1.074
In this paper, we propose an architecture design of military operation system utilizing cellular networks. The main contribution of this paper is to provide a cost-effective military operation solution for ground forces, which is based on IT(information technology). By employing the cellular phones of officers` and non-commissioned officers` as the tools of operational communication, the proposed system can be constructed in the minimum duration and be built on the four components: command and control system, gateway, security system, and terminal(cell phone). This system is most effective for the warfare of limited area, but the effectiveness does not decrease under the total war covering the whole land of Korea. For the environmental change of near future, expanded architecture is also provided to utilize the functionalities of smart phones.
Research on Interoperability Level Assessment Regard of Tactical Data-Link Characteristics
Na, Hyeng-Doo ; Cheon, Jae-Young ; Lee, Nam-Yong ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 1, 2011, Pages 84~91
DOI : 10.9766/KIMST.2011.14.1.084
The Systems Interoperability Test and Evaluation System(SITES) is an T&E support tool for both information system and weapon system. The SITES was developed by reference to the Level of Information Systems Interoperability(LISI) in US. We use the tool via MND Broad convergence Network(BCN) in order to assess information system`s interoperability. Nowadays, there are many ongoing researches on expanding assessment capability into weapon systems. As part of those research topics, this paper analyze the characteristics of tactical data-link messages which is the way to exchange the information among the weapon systems, and reflect that characteristics in interoperability level assessment.
Development of Fretting Fatigue Parameter
Lee, Hyuk-Jae ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 1, 2011, Pages 92~99
DOI : 10.9766/KIMST.2011.14.1.092
In this study, new multi-axial, critical plane based, fretting fatigue crack initiation parameter is developed by the addition of a new term into the Modified Shear Stress Range(MSSR) parameter. The newly developed parameter (MSSR`) is then used to evaluate fretting fatigue life of titanium alloy, Ti-6A1-4V with various contact conditions. Finite element analysis is also used in order to obtain stress distribution on the contact surface during fretting fatigue test, which is then used for the calculation of fretting fatigue parameter. The MSSR` parameter shows better performance in predicting fretting fatigue lives from the conventional fatigue data, and less scattering within fretting fatigue data with different contact geometries.
Effective Elimination of False Alarms by Variable Section Size in CFAR Algorithm
Roh, Ji-Eun ; Choi, Beyung-Gwan ; Lee, Hee-Young ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 1, 2011, Pages 100~105
DOI : 10.9766/KIMST.2011.14.1.100
Generally, because received signals from radar are very bulky, the data are divided into manageable size called section, and sections are distributed into several digital signal processors. And then, target detection algorithms are applied simultaneously in each processor. CFAR(Constant False Alarm Rate) algorithm, which is the most popular target detection algorithm, can estimate accurate threshold values to determine which signals are targets or noises within center-cut of section allocated to each processor. However, its estimation precision is diminished in section edge data because of insufficient surrounding data to be referred. Especially this edge problem of CFAR is too serious if we have many sections to be processed, because it causes many false alarms in most every section edges. This paper describes false alarm issues on MCA(Minimum Cell Average)-CFAR, and proposes a false alarm elimination method by changing section size alternatively. Real received data from multi-function radar were used to evaluate a proposed method, and we show that our method drastically decreases false alarms without missing real targets, and improves detection performance.
The Development of the Data Acquisition & Analysis System for Multi-Function Radar
Song, Jun-Ho ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 1, 2011, Pages 106~113
DOI : 10.9766/KIMST.2011.14.1.106
This paper describes Data Acquisition & Analysis System(DAS) for analysis of the multi-function radar. There are various information - beam probing data, clutter map data, plot data, target tracking data, RT tracking data, radar signal processing data, interface data - this device saves. The most important thing of data analysis is that a researcher gets a view of the whole data. The DAS intergrates with all of the data and provides overall information on the time matters occur. This is very useful advantage for approaching the matter easily. System algorithms of multi-function radar are improved by using this advantage. As a result of, range blank region have fallen about 72% and it is able to keep track in jammer environment.
Analysis of System Instability Factors in a Bistatic Radar
Yang, Jin-Mo ; Lee, Min-Joon ; Yun, Jae-Ryong ; Kim, Whan-Woo ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 1, 2011, Pages 114~122
DOI : 10.9766/KIMST.2011.14.1.114
In this paper, we have identified the system instability factors in a bistatic radar system using pulse chasing and considered their effects on the bistatic receiver`s MTI(Moving Target Indication) improvement performance. The pulse chasing is a method to efficiently scan a restricted search area within the limited transmitter power and time in a bistatic radar and to track a series of transmitted pulses using the receiver beam which has ideally matched to the pulse propagation rate. In this paper, we have discussed the interrelationship between the pulse chasing and time and frequency/phase synchronization and described the effects of the identified system instability factors on two kinds of MTI filter configuration, single delay-line and double delay-line, in the bistatic radar. And also, we have confirmed that the overall system improvement is restricted by a lower improvement factor among identified them, and discussed the allowable tolerance of the time and frequency/phase synchronization in the bistatic system.
Modeling and Design of a Distributed Detection System Based on Active Sonar Sensor Networks
Choi, Won-Yong ; Kim, Song-Geun ; Hong, Sun-Mog ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 1, 2011, Pages 123~131
DOI : 10.9766/KIMST.2011.14.1.123
In this paper, modeling and design of a distributed detection system are considered for an active sonar sensor network. The sensor network has a parallel configuration and it consists of a fusion center and a set of receiver nodes. A system with two receiver nodes is considered to investigate a theoretical aspect of design. To be specific, AND rule and OR rule are considered as the fusion rules of the sensor network. For the fusion rules, it is shown that a threshold rule of each sensor node has uniformly most powerful properties. Optimum threshold for each sensor is obtained that maximizes the probability of detection given probability of false alarm. Numerical experiments were also performed to investigate the detection characteristics of a distributed detection system with multiple sensor nodes. The experimental results show how signal strength, false alarm probability, and the distance between nodes in a sensor field affect the system detection performances.
Piezoresistive-Structural Coupled-Field Analysis and Optimal Design for a High Impact Microaccelerometer
Han, Jeong-Sam ; Kwon, Soon-Jae ; Ko, Jong-Soo ; Han, Ki-Ho ; Park, Hyo-Hwan ; Lee, Jang-Woo ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 1, 2011, Pages 132~138
DOI : 10.9766/KIMST.2011.14.1.132
A micromachined silicon accelerometer capable of surviving and detecting very high accelerations(up to 200,000 times the gravitational acceleration) is necessary for a high impact accelerometer for earth-penetration weapons applications. We adopted as a reference model a piezoresistive type silicon micromachined high-shock accelerometer with a bonded hinge structure and performed structural analyses such as stress, modal, and transient dynamic responses and sensor sensitivity simulation for the selected device using piezoresistive-structural coupled-field analysis. In addition, structural optimization was introduced to improve the performances of the accelerometer against the initial design of the reference model. The design objective here was to maximize the sensor sensitivity subject to a set of design constraints on the impact endurance of the structure, dynamic characteristics, the fundamental frequency and the transverse sensitivities by changing the dimensions of the width, sensing beams, and hinges which have significant effects on the performances. Through the optimization, we could increase the sensor sensitivity by more than 70% from the initial value of
satisfying all the imposed design constraints. The suggested simulation and optimization have been proved very successful to design high impact microaccelerometers and therefore can be easily applied to develop and improve other piezoresistive type sensors and actuators.
Studies on Changes of Blood Components and Body Composition in the Cadets
Kim, Dong-Soo ; Chung, Yeon-Soo ; Kim, Keun-Su ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 1, 2011, Pages 139~146
DOI : 10.9766/KIMST.2011.14.1.139
This study investigated physical and physiological changes of normal young adults, who are cadets of the Air Force Academy, have kept long-term physical activities and healthy behavior. The physical and physiological indices were the blood and body composition. Data were collected at the first year period, and then 4th year period from same group of cadets. The amounts of blood components were not changed, but variation among cadets was significantly reduced in the 4th grade period. The red blood cells(RBCs) were significantly reduced and the concentration of hemoglobin(HGB) were significantly increased. The body weight was significantly decreased in the 1st grade period since the body fat was rapidly decreased after the basic military drill, and then it was recovered with building up of the skeletal muscle in the 4th grade period. Asymmetry of the arms was decreased with the increased physical activities and usage of various equipments. The muscular endurance were significantly enhanced in the 4th grade period. The long-term physical activities and healthy behaviors may keep the physical strength through enhanced blood stream and oxygen supply by reduction of the RBCs and increased HGB concentration, and fat and muscle control.
Nonequilibrium Molecular Dynamics Simulation Study of Kinetic Energy and Velocity Distribution Profiles of Argon Gases in Shock Waves
Hwang, Hyon-Seok ; Lee, Ji-Hye ; Kwon, Chan-Ho ; Kim, Hong-Lae ; Park, Min-Kyu ; Kim, Seong-Shik ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 1, 2011, Pages 147~153
DOI : 10.9766/KIMST.2011.14.1.147
A series of nonequilibrium molecular dynamics(NEMD) simulations are performed to investigate the kinetic energy and velocity distributions of molecules in shock waves. In the simulations, argon molecules are used as a medium gas through which shock waves are propagating. The kinetic energy distribution profiles reveals that as a strong shock wave whose Mach number is 27.1 is applied, 39.6% of argon molecules inside the shock wave have larger kinetic energy than molecular ionization energy. This indicates that an application of a strong shock wave to argon gas can give rise to an intense light. The velocity distribution profiles in z direction along which shock waves propagate clearly represent two Maxwell-Boltzmann distributions of molecular velocities in two equilibrium regions and one bimodal velocity distribution profile that is attributed to a nonequilibrium region. The peak appearing in the directional temperature in z direction is discussed on a basis of the bimodal velocity distribution in the nonequilibrium region.
Effect of Ignition Delay Time Gap on the Linked Pyrotechnic Thrusters
Kim, Ki-Un ; Jeon, In-Soo ; Ahn, Sung-Woo ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 1, 2011, Pages 154~159
DOI : 10.9766/KIMST.2011.14.1.154
The effect of the ignition delay time gap is newly studied. The operational characteristics of the linked two pyrotechnic thrusters are affected by the time gap. Although two thrusters are simultaneously ignited, the time at which the pressure starts to rise in each thruster may not be synchronized. The characteristic of the system with the time gap is compared with that of the fully synchronized system without any time gap. Depending upon the magnitude of the time gap, the pressure-time profile and the ballistic performance are different. When two pyrotechnic thrusters have a time gap, the peak pressure of one thruster(in which the pressure is built up earlier) is increased and the other is decreased. As the time gap is increased, the peak pressure is converged into the maximum pressure. This maximum pressure can be obtained when only one thruster is activated. Because the maximum pressure is bounded, it is predicted that there isn`t any catastrophic failures in the considered system. When the time gap is relatively small, the impulse of the combined force acting on the moving body is almost maintained. But the ballistic performance of the system with a large time gap should be carefully estimated because the reduction of the ballistic performance should not be easily neglected.