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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 10, Issue 4 - Dec 2007
Volume 10, Issue 3 - Sep 2007
Volume 10, Issue 2 - Jun 2007
Volume 10, Issue 1 - Mar 2007
Selecting the target year
A Study on Course Correction Performance Expectation & Algorithm Implementation of 1D CCM
Kim, Ki-Pyo ;
Journal of the Korea Institute of Military Science and Technology, volume 10, issue 1, 2007, Pages 5~13
The trajectory of an current artillery munition is subject to a variety of different error sources resulting in more or less big deviation from the nominal predicted flight path. The 1D CCM(Course Correction Munition) has appeared to solve this problem and the mechanism of 1D CCM is a simple and low cost one using the influence of drag to range behavior of an artillery munition. In the paper 1D CCM concept has been simulated using wind tunnel experiment results of the specified Korean munition with CCF(Course Correction Fuze) and calculated the performance of its rang error reduction. From the simulated results it can be numerically explained that the possibility of adaptation of 1D CCM concept to Korean artillery munitions.
SDINS Transfer Alignment using Adaptive Filter for Vertical Launcher
Park, Chan-Ju ; Lee, Sang-Jeong ;
Journal of the Korea Institute of Military Science and Technology, volume 10, issue 1, 2007, Pages 14~21
This paper proposes SDINS(strapdown inertial navigation system) transfer alignment method for vertical launcher using an adaptive filter in the ship. First, the velocity and attitude matching transfer alignment method is designed to align SDINS for vertical launcher. Second, the adaptive filter is employed to estimate measurement noise variance in real time using the residual of measurements. Because it is difficult to decide measurement noise variance when noise properties of the ship SDINS are changed. To verify its performance, it is compared with the EKF(Extended Kalman filter) using uncorrect measurement variance. The monte carlo simulation results show that proposed method is more effective in estimating attitude angle than EKF.
A Study of Helicopter Initial Sizing using Statistical Methodology
Kim, June-Mo ; Oh, Woo-Seop ;
Journal of the Korea Institute of Military Science and Technology, volume 10, issue 1, 2007, Pages 22~32
This paper describes a study of a helicopter database for the sizing stage of a preliminary design process. The database includes specifications and performance parameters for more than 150 conventional single rotor helicopters currently in market. Design parameters, including configuration and weight parameters, have been analyzed and trend curve equations(regression equations) are derived using the regression analysis method. Finally, the applicability of this research result was verified whether the method is reliable for being adopted as a useful design tool in the early stage of a helicopter design process.
Lift Force Variation of Flapping Wing
Hong, Young-Sun ;
Journal of the Korea Institute of Military Science and Technology, volume 10, issue 1, 2007, Pages 33~43
Using the more common conventional chordwise aerodynamic approach, flapping a flat plate wing with zero degree chordwise pitch angle of attack and no relative wind should not produce lift. However, in hover, with no forward relative velocity and zero degree chordwise pitch angle of attack, flapping flat plate wings does in fact produce lift. In the experiments peformed for this paper, the flapping motion is considered pure(downstroke and upstroke) with no flapping stroke plane inclination angle. No changes in chordwise pitch angle are made. The total force is measured using a force transducer and the net aerodynamic force is determined from this measured total force by subtracting the experimentally determined inertial contribution. These experiments were repeated at various flapping frequencies and for various wing planform sizes for flat plate wings. The trends in the aerodynamic lift variation found using a force transducer have nearly identical shape for various flapping frequencies and wing planform sizes.
A TEST Frame Application Technique for Improving Data Communication and Topology Update Function in Ad-Hoc Tactical Wireless Networks
You, Ji-Sang ; Baek, In-Cheol ;
Journal of the Korea Institute of Military Science and Technology, volume 10, issue 1, 2007, Pages 44~54
In the military field, according to the MIL-STD-188-220, which is an Ad-Hoc communication protocol used for sending out or receiving data and voice smoothly among nodes in the situation that wireless communication nodes move arbitrarily, data communication is cut off because nodes can not know topology changes perpetually in the link disconnection state due to node movement in the case that transmitters do not confirm whether data is delivered to receivers or not, and transmit only the data having routine precedence continuously. In order to solve this problem, we have proposed the technique that makes efficient data communication possible by achieving a rapid topology change detection and link information update using TEST frame. We have analyzed TEST frame application effects in the two aspects of the topology update delay time and the data transmission success ratio.
Formalism-Based Defense Safety/Security-Critical Software Development & Certification Criteria - Application of Formal Methods to Safety/Security-Critical Software Certification Process Activities -
Kim, Chang-Jin ; Choi, Jin-Young ;
Journal of the Korea Institute of Military Science and Technology, volume 10, issue 1, 2007, Pages 55~69
The paper provides the approach to apply formal methods to the development and certification criteria of defense safety/security-critical software. RTCA/DO-178B is recognized as a do facto international standard for airworthiness certification but lack of concrete activities and vagueness of verification/certification criteria have been criticized. In the case of MoD Def Stan 00-55, the guidelines based on formal methods are concrete enough and structured for the defense safety-related software. Also Common Criteria Evaluation Assurance Level includes the strict requirements of formal methods for the certification of high-level security software. By analyzing the problems of DO-178B and comparing it with MoD Def Stan 00-55 and Common Criteria, we identity the important issues In safety and security space. And considering the identified issues, we carry out merging of DO-178B and CC EAL7 on the basis of formal methods. Also the actual case studies for formal methods applications are shown with respect to the verification and reuse of software components.
Study on M&S PlugIn-Based Architecture(PBA) for SBA
Won, Garng-Yun ; Choi, Sang-Yeong ;
Journal of the Korea Institute of Military Science and Technology, volume 10, issue 1, 2007, Pages 70~77
Simulation Based Acquisition(SBA) gains interest from the defense acquisition community. To accomplish SBA efficiently, M&S should be collaborately used in. This paper proposes PBA(PlugIn-Based Architecture) that is a common software development infrastructure and provides reuse mechanism with plugin components. PlugIns are reuse entity possible to plug-in-play statically and dynamically. This architecture supports stand alone simulation and HLA-compliant distributed simulation also.
Gun-oriented Engagement Simulation System
Lee, Dong-Hoon ; Kim, Cheol-Ho ; Kim, Tae-Su ;
Journal of the Korea Institute of Military Science and Technology, volume 10, issue 1, 2007, Pages 78~85
A gun is still one of the major weapons of a combat ship. To assess the ship's fire control capability which is influenced by tracking system, fire control algorithm, gun, the ship itself, target behavior, environment and engagement situation, simulation system for gun-oriented engagement for surface ship is needed. This paper proposes the process for designing and implementing a gun-oriented engagement simulation system using DEVS(Discrete Event Simulation Specification), which is a formalism based on the set theory. It consists of the following activities : 1) analyzing the characteristics of a gun-oriented engagement, 2) constructing the deterministic model of the combat ship of study with DEVS, 3) modeling properties of each entity showing as stochastic errors. With this process, the gun-oriented engagement simulation system is developed and applied for the combat system under development.
Analysis of the Structure of Technology Spillover on Industries by Analyzing Patents
Jung, Ha-Gyo ; Whang, Kyu-Seung ;
Journal of the Korea Institute of Military Science and Technology, volume 10, issue 1, 2007, Pages 86~93
The objective of this paper is to examine the structure of technology spillover from UAV(unmanned air vehicle) technology to other industries by applying patents analysis. The network analysis on patent data of USPTO(United Stated Patents and Trademark Office) from 1981 to 2000 was adopted to investigate the characteristic change of the technology spillover The results show that the influence of the UAV technology to other industries has grown over the twenty years period. For the weapon system development, this study provides a research basis to estimate the technology spillover effects on industries. Searching a structural niche from the inter-industrial knowledge flow structure might be a useful technique to find core technologies which generate large technology spillover on the other industries.
A Study on the Uncertainty of MVRS
Park, Yong-Suk ; Choi, Ju-Ho ;
Journal of the Korea Institute of Military Science and Technology, volume 10, issue 1, 2007, Pages 94~100
MVRS's measuring principles are based on the Doppler principle. It measures the velocities near the muzzle using the doppler signal output from the antenna and then predicts the velocity of the bullet leaving the muzzle by performing the regression analysis on previous measured velocities. There are a number of error sources when calculating the muzzle velocity. Antenna has long term frequency stability error and the doppler signal from the antenna has noise. These two error sources influence the accuracy of estimated velocities from the doppler signal. Estimated velocity errors result in the random error of data statistics. And when performing a regression analysis these random error components are transferred to the fitting error component. This study also analyzed the error components according to the hardware limitations of MVRS-700 and the signal processing method, and presented the calculated uncertainty of muzzle velocity.
Chain code based New Decision Technique of Edge Orientation
Sung, Min-Chul ; Lee, Sang-Hwa ; Cho, Nam-Ik ;
Journal of the Korea Institute of Military Science and Technology, volume 10, issue 1, 2007, Pages 101~106
In this paper, we propose chain code based decision technique of edge orientation. Edge Information is one of the most important information for handling image signals, and is applied to various civilian and military area, such as image surveillance for military reconnaissance, restoration of noised image signal, fingerprint recognition, and so on. The conventional methods to find edge orientations exploit a certain size of mask which weights for a certain direction, so they showed limitations in the case of diagonal edges except 45 degrees. We find edge orientations using chain code. According to the experiments, the proposed method shows better performance than the conventional approaches. The exact edge orientations including diagonal directions are well found.
A Study on the Relation Between the Scale Factor Non-linearity and Dither Noise form of Ring Laser Gyroscope
Shim, Kyu-Min ; Lee, Youn-Seon ;
Journal of the Korea Institute of Military Science and Technology, volume 10, issue 1, 2007, Pages 107~115
In this paper we confirm the disappearance of dynamic lock-in simply by increasing the dither noise magnitude of the ring laser gyroscope by numerical and experimental method. After that, we numerically study the relation between the dither noise forms and scale factor non-linearities by comparing those of the two case outputs which are individually generated by operating with the two types of dither noise forms. The first one is the simple form composed of consecutive alternations of the random increasing and decreasing parts but maximum and minimum dither envelopes are scarcely changeable. And the second one is similar to the first one but maximum and minimum dither envelopes are randomly changable. As a result, we find that the scale factor non-linearity could be improved by the second one. And we confirm those results by experimental measurements.
Chemical Agent Disposal Technology by a 2-step Process(I) (Agent Hydrolysis followed by Incineration)
Lee, Jong-Chol ; Lee, Yong-Han ; Oh, Sok-Chong ; Hong, Dea-Sik ;
Journal of the Korea Institute of Military Science and Technology, volume 10, issue 1, 2007, Pages 116~122
A 2-step process for the safe disposal of chemical warfare agents(agent hydrolysis followed by incineration In the submerged-quench incinerator) was studied to obtain basic data for the design of pilot plant in the future. Sample materials used for the hydrolysis reaction were sarin(GB), sulfur mustard (HD), and methylphosphonic difluoride(DF). The hydrolysates of these materials were thermally destroyed in a submerged-quench incineration system. Experimental conditions for achieving destruction efficiency of 99.99% in both steps were established and phosphoric acid was recovered from the waste water when destroying DF hydrolysate in the incinerator. Treated water could be reused as process water for the agent hydrolysis.
Chemical Agent Disposal Technology by a 2-step Process(II) (Agent Hydrolysis followed by Supercritical Water Oxidation)
Lee, Jong-Chol ; Bambang, Veriansyah ; Song, Eun-Suk ; Kim, Jae-Duck ;
Journal of the Korea Institute of Military Science and Technology, volume 10, issue 1, 2007, Pages 123~129
A 2-step process for the safe destruction of chemical wafare agents(agent hydrolysis followed by supercritical water oxidation) was studied to obtain kinetic data for the pilot plant design. This process is simple to operate by using commercial equipments and could be applied as an alternative technology to incineration. Sarin(GB) and sulfur mustard(HD) were hydrolysed in sodium hydroxide and water respectively and their hydrolysates and OPA, which is binary agent for GB were oxidized in a continuous flow supercritical water oxidation system. Destruction efficiencies of the materials were above 99.99% in supercritical water.
How Birds and Insects Fly
Hong, Young-Sun ;
Journal of the Korea Institute of Military Science and Technology, volume 10, issue 1, 2007, Pages 130~143
Using steady state aerodynamic theories, it has been claimed that insects and birds cannot fly. To make matters worse, insects and birds fly at low Reynolds numbers. Therefore, a recurring theme in the literature is the importance of understanding unsteady aerodynamic effect and how the vortices behave when they separate from the moving surface that created them. In flapping flight, birds and insects can modify wing beat amplitude, stroke angle, wing planform area, angle of attack, and to a lesser extent flapping frequency to optimize the generation of lift force. Some birds are thought to employ two different gaits(a vortex ring gait and a continuous vortex gait) and unsteady aerodynamic effect(Clap and fling, Delayed stall, Wake capture and Rotational Circulation) in flapping flight. Leading edge vortices may produce an increase in lift. The trailing edge vortex could be an important component in gliding flight. Tip vortices in hovering support the body weight of the hummingbirds. Thus, this study investigated how insects and birds generate lift at low Reynolds numbers. This research is written to further that as yet incomplete understanding.
Structural Analysis for Thread Joint Part of Rocket Motor Case Applied Pre-load
Koo, Song-Hoe ; Cho, Won-Man ; Lee, Bang-Eop ;
Journal of the Korea Institute of Military Science and Technology, volume 10, issue 1, 2007, Pages 144~149
Behaviour of a thread joint of a rocket motor case show complex structural characteristics. Pre-torque must be applied to the threads to prevent the loosening of the interface from the additional pressure load. During the pressurization of the rocket motor case, the jointing face may be opened if the pre-torque were not set properly or the structure may be failed if the local concentrated stress exceeds the strength of the material. In this paper, the structural behaviour of a thread joint of a rocket motor case were analyzed by the finite element method and the results were compared to the experimental ones. A method to set a pre-torque for a thread joint were proposed to ensure the structural safety.