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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 9, Issue 4 - Dec 2006
Volume 9, Issue 3 - Sep 2006
Volume 9, Issue 2 - Jun 2006
Volume 9, Issue 1 - Mar 2006
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SDINS/GPS/ZUPT Integration Land Navigation System for Azimuth Improvement
Lee, Tae-Gyoo ; Cho, Yun-Cheol ; Jang, Suk-Won ; Park, Jai-Yong ; Sung, Chang-Ky ;
Journal of the Korea Institute of Military Science and Technology, volume 9, issue 1, 2006, Pages 5~12
This study describes an SDINS/GPS/ZUPT integration algorithm for land navigation systems. The SDINS error can be decoupled in two parts. The first part is the the Schuler component which does not depend on object motion parameters, and the other is the Non-Schuler part which depends on the product of object acceleration and azimuth error. Azimuth error causes SDINS error in proportion to the traversed distance. The proposed system consists of a GPS/SDINS integration system and an SDINS/ZUPT integration system, which are both realized by an indirect feedforward Kalman filter. The main difference between the two is whether the estimate includes the Non-Schuler error or not, which is decided by the measurement type. Consequently, subtracting GPS/SDINS outputs from SDINS/ZUPT outputs provide the Non-Schuler error information which can be applied to improving azimuth accuracy. Simulation results using the raw data obtained from a van test attest that the proposed SDINS/GPS/ZUPT system is capable of providing azimuth improvement.
A Study on the Effect of Storing Temperature and Humidity upon the Self Life of Propellant KM30Al
Cho, Ki-Hong ;
Journal of the Korea Institute of Military Science and Technology, volume 9, issue 1, 2006, Pages 13~23
A propellant mainly consisting of nitric ester including nitrocellulose and nitroglycerine is characteristic of being decomposed naturally. And this phenomenon is known as being affected mostly by its storing temperature and humidity. In this research, the effect of storing temperature and humidity on self life has been studied by measuring the contained quantity of residual stabilizer of propellant KM30Al, which are parts of 155MM propelling charge K676 and K677; the method for the measurement is acceleration aging test, and decomposition reaction equation, Eyring Equation and Berthlot Equation were used for the calculation. As result of this study, it was found that the storing temperature influenced seven times as large as the storing humidity upon the self life of the propellant KM30Al, Furthermore, especially in the high temperature region, the storing temperature had a dominant effect on the self life.
The Effectiveness Analysis of Multistatic Sonar Network Via Detection Peformance
Jang, Jae-Hoon ; Ku, Bon-Hwa ; Hong, Woo-Young ; Kim, In-Ik ; Ko, Han-Seok ;
Journal of the Korea Institute of Military Science and Technology, volume 9, issue 1, 2006, Pages 24~32
This paper is to analyze the effectiveness of multistatic sonar network based on detection performance. The multistatic sonar network is a distributed detection system that places a source and multi-receivers apart. So it needs a detection technique that relates to decision rule and optimization of sonar system to improve the detection performance. For this we propose a data fusion procedure using Bayesian decision and optimal sensor arrangement by optimizing a bistatic sonar. Also, to analyze the detection performance effectively, we propose the environmental model that simulates a propagation loss and target strength suitable for multistatic sonar networks in real surroundings. The effectiveness analysis on the multistatic sonar network confirms itself as a promising tool for effective allocation of detection resources in multistatic sonar system.
A Broadband Active Composite Dipole Antenna for Direction-finding Applications at V/UHF-band
Choi, Jun-Ho ;
Journal of the Korea Institute of Military Science and Technology, volume 9, issue 1, 2006, Pages 33~40
A compact broadband active composite dipole antenna for direction finding system at the V/UHF-band is presented. It uses the composite structure which improves the antenna gain and the active circuit for broadband operation. This type of antenna has a high gain more than that of one dipole antenna within limited length(1m). The basic design and performance of both antenna structure and integrated active circuit are presented.
Analysis of the Defense R & D Programs Applied Systems Engineering Approach
Kwon, Yong-Soo ;
Journal of the Korea Institute of Military Science and Technology, volume 9, issue 1, 2006, Pages 41~49
A systems engineering is an interdisciplinary engineering management process that evolves and verifies an integrated, life-cycle balanced set of system solutions that satisfy customer needs. This work describes analysis of. the defense R & D programs applied systems engineering approach. FA-18E/F and NSSN defense acquisition programs are adopted for the case study. Those two programs is performed by IPPD, which is one of the systems engineering management techniques. From the analysis results, implementation considerations of domestic defense R & D programs are presented.
A Rotating Chamber Mechanism and Its Controller for CTA Guns
Lim, S. ; Kim, K.K. ; Shim, J.S. ; Kil, S.J. ; Lee, G.H. ; Cha, G.U. ; Cho, C.K. ; Hong, S.K. ;
Journal of the Korea Institute of Military Science and Technology, volume 9, issue 1, 2006, Pages 50~59
Lately, there exist growing demands for the use of CTAs(Cased Telescoped Ammunitions) to increase the firepower of mid-calibre automatic guns despite spatial limitations of armament. In this paper, for automatic CTA guns a rotating chamber mechanism is designed based on parallel index concept. Via dynamic simulations it proves capable of smooth operation even at as high a firing rate as 200spm. Subsequently, motor controllers are synthesized to drive the chamber at any constant speed and also to control positions in the presence of large disturbances caused by the intermittently-rotating load. It is remarkable that we successfully adopted a disturbance observer to treat disturbances only with a moderate bandwidth of the closed-loop system.
VV & A Application for the Assurance of Defense M & S Credibility
Choi, Sang-Yeong ;
Journal of the Korea Institute of Military Science and Technology, volume 9, issue 1, 2006, Pages 60~71
With the increased reliance on M & S(Modeling & Simulation) in military training, defense analysis, and system acquisition. The credibility of M & S becomes even more critical issue in the M & S application community. In this paper, we have introduced the VV & A(Verification, Validation and Accreditation) concept of M & S for the assurance of its credibility, and proposed the VV & A model applicable to a military simulator development with the illustrative example of MSAM(Medium range-Surface to Air Missile) system simulator.
Experimental Research on the Optimal Surveillance Equipment Allocation Using Geo-spatial Information
Lee, Yong-Woong ; Sung, Chang-Sup ; Yang, Woo-Suk ; Im, Seong-Bin ; Eo, Yang-Dam ;
Journal of the Korea Institute of Military Science and Technology, volume 9, issue 1, 2006, Pages 72~79
This study was focused on analyzing mathematical model for optimal allocation of surveillance equipment which is operated on the natural geographical condition, such as DMZ fence area. Optimal allocation algorithm was studied for the equipment to develop the whole surveillance and watch model for the two area as testing. Also 3D visualization program was developed to display and analyze the detecting effect. The results show that our suggested model will be available for enhancing security condition on the watching area.
A Study on the Information Security Technical Architecture focusing on the Primary Defense Information Infrastructure
Choi, Ji-Na ; Nam, Kil-Hyun ;
Journal of the Korea Institute of Military Science and Technology, volume 9, issue 1, 2006, Pages 80~88
The purpose of this thesis is to research and propose a practical Information Security Technical Architecture on Primary Defense Information Infrastructure with regard to requirement of information security. The scope of this research is limited to national defense information master plan & security rule, and U.S. DoD's IATF is used to plan a detailed structure. The result of this research can be used as a guide book for providing security for Army IT infrastructure now and in the future as well as to devise a plan for research and development in information protection technology.
A Study for Signal Attenuation as splicing the output on LVDT
Kwon, Jong-Kwang ; Kim, Whan-Woo ;
Journal of the Korea Institute of Military Science and Technology, volume 9, issue 1, 2006, Pages 89~98
This paper describes signal attenuation characteristics as splicing the output on LVDT for stability and reliability of switching mechanism, which is developed to use common signal between FLCC and EDFLCC, on T-50 aircraft. The method of test is classified a Pspice simulation and an actual hardware evaluation. The difference of error margin for two methods is 10times, the latter higher. The result in this experiment shows that the signal attenuation as splicing the output on LVDT doesn't affect and the static error margin is 53% for develope the EDFLCC.
A Study on Analysis of Emitter Geolocation Coverage Area based on the Characteristics and Deployment of Sensors
Yang, Jong-Won ; Park, Cheol-Sun ; Jang, Won ;
Journal of the Korea Institute of Military Science and Technology, volume 9, issue 1, 2006, Pages 99~108
In this paper, we analyzed the characteristics of emitter geolocation coverage area within which the emitter lies with a specified probability based on the LOBs(Line of Bearing) of sensors. Stansfield and MSD algorithms were applied to calculate BPE(Best Point Estimate), EEP(Elliptical Error Probable) and CEP(Circular Error Probable), They used the weighting factors composed of
(bearing error), QF(quality factor),
(probability being inside) to optimize the performance. The characteristics of EEP was investigated in the change of them and those of CEP was analyzed based on the deployment of sensors.
Real Time W-band FMCW Distance Measuring Devices Using TMS320C6701 DSP
Lee, Chang-Won ;
Journal of the Korea Institute of Military Science and Technology, volume 9, issue 1, 2006, Pages 109~116
This paper presents a real time distance measuring device using a W-band linear frequency modulated continuous wave(FMCW) radar and TMS320C6701 digital signal processor(DSP). We used FFT operation for measuring distance with the beat signals and the results of FFT could be converted to distance with ease. We presented how to implement a real time miniaturized hardware system including network protocols using a single DSP core. Also how to control the modulation signal of FMCW system to compensate the VCO nonlinearity using the Time Gating control of DSP is presented. We have shown that the proposed system has good performances for measuring distance in real time via outdoor environment experiments.
The Cooling Performance of Thrust Chamber with Film Cooling
Kim, Sun-Jin ; Jeong, Hae-Seung ;
Journal of the Korea Institute of Military Science and Technology, volume 9, issue 1, 2006, Pages 117~124
Experiments on film cooling were performed with a small scale rocket engine homing liquid oxygen (LOx) and Jet A-1(jet engine fuel). Film coolants(Jet A-1 and water) were injected through the film cooling injector. Film cooled length and the outside wall temperature of the combustor were determined for chamber pressure, and the different geometries(injection angle) with the flow rates of film coolant. The loss of characteristic velocity due to film cooling was determined for the case of film cooling with water and Jet A-1. As the coolant flow increases, the outside wall temperatures decrease but the decrease in the outside wall temperatures reduced over the 8 percent film coolant flow rate. The efficiency of characteristic velocity was decreased with the Increase of the film coolant flow rate.
Protection performance of dual flying oblique plates against yawed long rod penetrator
Paik, Seung-Hoon ; ; Yoo, Yo-Han ; Lee, Min-Yeong ;
Journal of the Korea Institute of Military Science and Technology, volume 9, issue 1, 2006, Pages 127~134
The protection capability against an enhanced long rod(L/D=30) with yaw is investigated numerically and compared with that of shorter one(L/D=15). In addition details of interactions between yawed long rods and oblique plate velocity are examined. Through the simulation results, we find that dual flying plates system is more effective with longer rod due to the elongated disturbance. The protection performance is more effective for the penetrator with
of yaw angle than that with a yaw angle of
System Requirement Architecture Modeling of KT-1 Export Version
Kang, Min-Seong ; Lee, Jin-Kyun ; Kim, Jin-Suk ; Shon, Hwan-Ick ; Kang, Young-Ho ; Lee, Joong-Yoon ; Choi, Min-Shin ; Lee, Young-Sun ;
Journal of the Korea Institute of Military Science and Technology, volume 9, issue 1, 2006, Pages 135~143
This paper describes a requirement architecture modeling for the front end of KT-1 export version requirement definition processes to construct SDS(system development specification). The requirement definition process is a highly conceptual process that is difficult to carry out. This paper focuses on how to perform the KT-1 export version requirements definition process including the integration of process, methods and tools for the front-end activity of requirements definition process. This requirement model is structured in four segments, including requirement layering, requirement categorization, life cycle stakeholder and requirement definition process using Computer-Aided Systems Engineering tool(CORE).
Design of Nx1 Modified Rectangular Loop Array Antenna for Radar Application
Jang, Jae-Su ; Ko, Jin-Hyun ; Ha, Jae-Kwon ; Kim, Tae-Hyun ; Park, Dong-Chul ; Kim, Chan-Hong ;
Journal of the Korea Institute of Military Science and Technology, volume 9, issue 1, 2006, Pages 144~151
A rectangular loop antenna for S-band radar is proposed. The proposed loop antenna is the modified type of folded monopole antenna. The feeding line is coplanar stripline with
phase difference for operating in odd mode. The proposed antenna showed return loss of -15.57dB at the center frequency and bandwidth of about 790MHz (> 25%) under the condition of VSWR < 2. The gains of single, 1x2, and 1x4 array loop antennas are 4.3, 7.0, and 10.2dBi, respectively.