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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 8, Issue 4 - Dec 2005
Volume 8, Issue 3 - Sep 2005
Volume 8, Issue 2 - Jun 2005
Volume 8, Issue 1 - Mar 2005
Selecting the target year
A Study on the Shock Behavior of Aluminium 2519 Weldments
Koo Man-Hoi ; Lee Chang-Hyun ; Gimm Hak-In ; Woo Ho-Gil ;
Journal of the Korea Institute of Military Science and Technology, volume 8, issue 1, 2005, Pages 5~13
In order to evaluate the credibility of the welded joint design for combat vehicle using A12519, the numerical analysis for the joint model has been studied and the results are compared with the experimental works by the impact projectiles. The numerical approach using LS-DYNA involves the process of the crack initiation and propagation as well as the applications of the failure criteria for both the ductile and brittle failures. The good agreement between the numerical and experimental works are proved.
A Study on the Effect of Storing Temperature upon the Self Life of Propelling Charge K676 and K677
Cho ki hong ; Chang il ho ;
Journal of the Korea Institute of Military Science and Technology, volume 8, issue 1, 2005, Pages 14~24
A propellant mainly consisting of nitric ester including nitrocellulose, nitroglycerine and nitroguanidine is characteristic of being decomposed naturally. And this phenomenon is known as being affected mostly by its storing temperature. In this research, the effect of storing temperature on self life has been studied by measuring the contained quantity of residual stabilizer of propellant KM30A1, ignition powder and combustible cartridge case, which are parts of 155MM propelling charge K676 and K677; the method for the measurement is acceleration aging test, and decomposition reaction equation and Berthlot Equation were used for the calculation. The result of this research shows that propellant KM30A1, ignition powder, combustible cartridge case in order of decreasing self life, and the self life decreases to 1/3 as the temperature increases by
Association Algorithm for the Distributed Passive Linear Arrays and the Radar
Kim Jin-Seok ;
Journal of the Korea Institute of Military Science and Technology, volume 8, issue 1, 2005, Pages 25~31
PLA(Passive Linear Array) system has been primarily utilized to detect and track underwater targets, such as submarines. This system has difficulty in distinguishing between underwater targets and surface ships in a dense target environment. And a single-PLA system does not provide target state observability. At least two PLAs are necessary to observe a track uniquely. To classify and localize the underwater targets effectively, first of all, it is very of importance to discriminate the surface ships in the multi-target environment. These problems can be overcome by the association of distributed PLAs and radars. In this paper, we present an algorithm to solve the track-to-track association of the heterogeneous data from three PLAs and one radar are noncollocated with known sensor positions. Also, this paper shows the simulation results to verify the proposed algorithm.
Experimental Analysis on the Cable Tension During the Laying and Recovery of a Submarine Cable
Yang Seung-Yun ; Kim Jeong-Hoon ; Kim Kyung-Sub ; Kim Jae-San ; Park Kwi-Ho ; Kim Gee-Won ; Lee Sang-Ho ;
Journal of the Korea Institute of Military Science and Technology, volume 8, issue 1, 2005, Pages 32~38
In this study, Experimental analysis on submarine cable tension was performed for the safe and efficient laying and recovery of a submarine cable. The tension analysis was done through the analyzed data using the cable dynamic theory and the measured data using the experiment. The analyzed cable tension was able to decide requirements for the purpose of laying and recovery of the submarine cable. As the result of tension analysis for a Submarine cable, it was shown a proper feasibility to determine the laying and recovery conditions of the submarine cable.
A Frequency Analysis of the Control Input for Right Test
Kwon Tae-Hee ; Chang Jae-Won ; Choi Sun-Woo ; Seong Kie-Jeong ;
Journal of the Korea Institute of Military Science and Technology, volume 8, issue 1, 2005, Pages 39~48
After the development of the Firefly, flight tests have been performed to verify the performance and get the parameters for the mathematical model of the aircraft. The flight test data is used to get parameters for the mathematical model of the aircraft through the parameter identification process. An arbitrary control input is applied to the test flight which is a part of parameter identification process. A square wave has been used a control input which is called Doublet signal. The aspect of the signal is same length and magnitude in both (+) and (-) directions such as sine wave. The Doublet signal is composed of a dominant frequency and many high frequencies, so that it is appropriate signal to excite the motion of an aircraft. In this paper, the control input of the flight test data has been analyzed to check the efficiency of the control input using DFT(Discrete Fourier Transform). From the result of analysis, an alternative input was extracted.
20cc-Class Reciprocating Engine Development for a Small Reconnaissance UAVs
Chang Sung-Ho ; Koo Sam-Ok ; Shin Young-Gi ; Kim Sung-Nam ; Kang Yoo-Won ; Yun Yeu-Il ; Kim Jin-Soo ;
Journal of the Korea Institute of Military Science and Technology, volume 8, issue 1, 2005, Pages 49~55
Due to small and light mission payloads, subsystems and propulsion system, small sized UAVs come to be available for reconnaissance that have been performed by aircraft and huge UAVs. The objective of this study is to develop an efficient propulsion system for small reconnaissance UAVs. A glow engine was modified for an efficient and robust 4-stroke gasoline engine with carburetor, new electronic control unit and lubrication system. Engine modification technique and small engine performance test stand are capable of economical method for military UAVs.
The Development of a Telemetry System for ALQ-X
Nam Yun Kwon ; Lee Byeong Nam ; Lee Seung Geun ; Lyu Jeong Ho ; Lee Dong Keun ;
Journal of the Korea Institute of Military Science and Technology, volume 8, issue 1, 2005, Pages 56~61
A novel method for telemetering flight operational data of airborne jammer to ground station is presented. The design and construction of an onboard telemetry transmitting set and a ground receiving set which are necessary for realizing this novel method is described. Using this novel method, ALQ-X, airborne jammer, can immediately transmit the gathered data during flight without additional exclusive telemetry set.
A Study oil the Application of EVMS in Defense R&D Programs
Choi Seok-Cheol ; Kim Jong-Pil ;
Journal of the Korea Institute of Military Science and Technology, volume 8, issue 1, 2005, Pages 62~68
In this paper, we review the general technique of Earned Value Management System(EVMS) which is the integrated management for cost, schedule and performance, and suggest an application of the integrated management of cost and schedule in the research and development(R&D) programs for defense acquisition.
Synthesis of azide-terminated glycidyl azide polymer with low molecular weight
Min Byoung-Sun ;
Journal of the Korea Institute of Military Science and Technology, volume 8, issue 1, 2005, Pages 69~80
A synthesis of azide-terminated glycidyl azide polymer, GAP-A, was carried out by tosylation and azidation of polyepichlorohydrin(PECH) prepared by cationic ring-opening polymerization. Polyepichlorohydrin was prepared by cationic activated monomer polymerization using ethylene glycol and
as an initiator and a catalyst at
. Tosylation of polyepichlorohydrin was performed using traditional TsCl/pyridine method and was also carried out using TsCl/amine catalysts to reduce the reaction time significantly. Azidation of tosyl-terminated PECH(OTs-PECH) was performed using
as an azidation reagent in DMF solvent at high temperature and was unexpectedly completed within 2 hours.
Frequency Response Analysis of Pipe Conveying Harmonically Excited Fluid
Oh Jun-Seok ;
Journal of the Korea Institute of Military Science and Technology, volume 8, issue 1, 2005, Pages 81~91
It is well known that the natural frequencies of the pipe come to be lower as internal fluid velocity and pressure increase, and the pipe will be unstable if the fluid velocity is higher than critical velocity. But even if the velocity of the fluid below the critical velocity, resonance will be caused by pulsation of the fluid. So the effects of pulsating fluid in pipe should be also taken into consideration for better analysis. The research of the vibration of piping system due to a fluid pulsation has been studied by many people. But most of them are dealt with determining the boundary between stable and unstable region without analyzing forced response in the stable region. In this study, not only stability analysis but also forced response analysis, which is caused by harmonically excited fluid especially, is conducted. In order to analyze the system numerically, the descretized equation is formulated by using FEM(Finite Element Method). And the results of this method are compared with those of AMM(Assumed Mode Method) which were used by many researcher earlier.