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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 15, Issue 6 - Dec 2012
Volume 15, Issue 5 - Oct 2012
Volume 15, Issue 4 - Aug 2012
Volume 15, Issue 3 - Jun 2012
Volume 15, Issue 2 - Apr 2012
Volume 15, Issue 1 - Feb 2012
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Obstacle Classification for Mobile Robot Traversability using 2-dimensional Laser Scanning
Kim, Min-Hee ; Kwak, Kyung-Woon ; Kim, Soo-Hyun ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 1, 2012, Pages 1~8
DOI : 10.9766/KIMST.2012.15.1.001
Obstacle detection is much studied by using sensors such as laser, vision, radar and ultrasonic in path planning for UGV(Unmanned Ground Vehicle), but not much reported about its characterization. In this paper not only an obstacle classification method using 2-dimensional LMS(Laser Measurement System) but also a decision making method whether to avoid or traverse the obstacle is proposed. The basic idea of decision making is to classify the characteristics by 2D laser scanned data and intensity data. Roughness features are obtained by range data using a simple linear regression model. The standard deviations of roughness and intensity data are used as measures for decision making by comparing with those of reference data. The obstacle classification and decision making for the UGV can facilitate a short path to the target position and the survivability of the robot.
A Study on the Effective Scanning Trajectory using Manipulator for Underground Object Detection
Lee, Myung-Chun ; Shin, Ho-Cheol ; Yoon, Jong-Hoon ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 1, 2012, Pages 9~15
DOI : 10.9766/KIMST.2012.15.1.009
This paper shows an effective scanning trajectory for a mine detection device that is one of the mission equipments of unmanned ground vehicle. The mine detection device is composed of a mine-detection sensor, and a 4 DOF manipulator enabling sensor position control. There are three modes that manage the mine detection device: passive, semi-automatic, and automatic. The automatic mode is used the most. This paper suggests a scanning method that makes shape of 8. This method prevents missing target area and enhances scanning speed when the mine detection device scans the ground surface in automatic mode. The suggested method is verified by simulations and experiments.
IEEE 802.11 MAC based Multi-hop Reservation and Backoff Scheme in MIMC Tactical Ad Hoc Networks
Cho, Youn-Chul ; Yoon, Sun-Joong ; Ko, Young-Bae ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 1, 2012, Pages 16~27
DOI : 10.9766/KIMST.2012.15.1.016
In multi-interface multi-channel(MIMC) based tactical ad hoc networks, QoS support for required operational capacity is one of the main challenging issues for multi-hop transmissions. To support QoS in such a harsh environment, we propose a novel MAC scheme to minimize multi-hop as well as per-hop delay. The current IEEE 802.11 MAC protocols should contend to reserve the channel resource at every hop by each sender. The every-hop channel contention results in a degradation of end-to-end delay for multi-hop transmissions. The basic idea of our scheme is to make a "multi-hop reservation" at the MAC layer by using the modified RTS frame. It contains additional information such as destination information, packet priority, and hop count, etc. In addition, we differentiate the contention window area according to the packet priority and the number of hops to deliver packets in the predefined allowed latency. Our scheme can minimize the multi-hop delay and support the QoS of the critical data in real time(i.e., VoIP, sensing video data, Video conference between commanders). Our simulation study and numerical analysis show that the proposed scheme outperforms the IEEE 802.11 MAC.
Systems Engineering based Live Fire Test of Weapon Systems
Yoo, Byung-Jik ; Hwang, Gyu-Hwan ; Ryu, Chung-Ho ; Kim, Moon-Ki ; Ye, Sung-Hyuck ; Han, Uk-Sang ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 1, 2012, Pages 28~35
DOI : 10.9766/KIMST.2012.15.1.028
We propose the live fire test process model based on systems engineering which consists of 4 phases i.e., review, setup, conduct and result. We also suggest the 4 phases acquisition model consisting of planning, execution, evaluation and disposal for test infrastructure. CMMI, TMMi and PMBOK are referred and hierarchial analysis method are adopted in developing the models. Thus, the detailed sub-processes are designed after defining higher level processes first. The higher level processes are defined by extracting common areas of all the test types. The low level processes for each specific test are designed by tailoring the higher level processes. By applying the proposed test process models into collaboration tool and information system, effective and systematic test processes for weapon systems are established.
A Study on Integration between an Entity-based War Game Model and Tank Simulators for Small-Unit Tactical Training
Kim, Moon-Su ; Kim, Dae-Kyu ; Kwon, Hyog-Lae ; Lee, Tae-Eog ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 1, 2012, Pages 36~45
DOI : 10.9766/KIMST.2012.15.1.036
In this thesis, we propose an integrated simulation method of virtual tank simulators and an entity-based constructive simulation model for small unit tactical training. To do this, we first identify requirements for virtual-constructive integrated simulation in a synthetic environment. We then propose a virtual and constructive interoperation method where individual combat entities of virtual-constructive models are interacting with each others. We develop a method of aggregating individual combat entities into a larger combat unit and disaggregating an unit into entities from time to time. We also present a way of sharing synthetic environment information between the models. Finally, we suggest that for more effective interoperability, virtual and constructive models should be developed by using common combat object models. The proposed interoperation method can be extended to further live-virtual-constructive models.
A Public Key Traitor Tracing Scheme with Key-update Method
Lee, Moon-Shik ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 1, 2012, Pages 46~56
DOI : 10.9766/KIMST.2012.15.1.046
Traitor Tracing schemes are broadcast encryption systems where at least one of the traitors who were implicated in the construction of a pirate decoder can be traced. This traceability is required in various contents delivery system like satellite broadcast, DMB, pay-TV, DVD and so on. In this paper, we propose a public key traitor tracing scheme with key-update method. If the system manager can update a secret key which is stored in an authorized decode, it makes a pirate decoder useless by updating a secret key A pirate decoder which cannot update a secret key does not decrypt contents in next session or during tracing a traitor, this scheme has merits which will make a pirate decoder useless, therefore this scheme raises the security to a higher level.
Fuzzy Rule-Based Adaptive Kalman Filter for State Estimation of Anti-Tank Threats
Lee, Eui-Hyuk ; Cho, Kyu-Gong ; Park, Sang-Soon ; Kang, Youn-Sik ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 1, 2012, Pages 57~65
DOI : 10.9766/KIMST.2012.15.1.057
To neutralize fast Anti-Tank Guided Missiles(ATGMs) or Anti-Tank Rockets(ATRs) projected at short ranges, the trajectories and times that the threats arrive at hard-kill systems should be predicted precisely. The trajectories of ATGMs or ATRs are almost stationary but the velocity and acceleration are very changeable in the terminal stage, so that it is needed to predict the characteristics of ATGMs and ATRs for filtering. In this paper the Fuzzy Rule based Adaptive Kalman Filter(FRAKF) is proposed to estimate the position, velocity and acceleration of the threats with accuracy and the performance of it is compared with the existing tracking filter considering the maneuvering characteristics of threats.
Development of Virtual Target Signal Generator for Verifying the Shipborne Tracking Radar Performance
Yi, Hui-Min ; Son, Jae-Hyun ; Na, Young-Jin ; Kim, Dong-Hawn ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 1, 2012, Pages 66~74
DOI : 10.9766/KIMST.2012.15.1.066
The virtual target signal generator was developed to verify the shipborne tracking radar performance. It was used to DRFM(Digital RF Memory) method to generate the virtual moving targets. The target signal includes Doppler shift and RCS according to the target motion. And the signal generator can make jamming signal and clutter to test shipborne radar performance at real environmental condition. This paper described the functional diagram and the hardware configuration items to meet the test requirements for the tracking radar. And it showed the critical design points for the sub-systems. The signal generator which was developed in this paper shared the operational information of the radar with the radar command and control part. To test the frequency agility of the radar, it had the local oscillator which could do high speed frequency switching according to radar information. By communicating between the signal generator and the radar command and control part, the local oscillator of signal generator could be controlled every pulse. It reduced the instantaneous bandwidth of signal generator and minimized the spurious. So it lowered the probability of generating wrong targets.
Study on Chemical-Biological Protection Performance of the CHEONGUNG's Integrated Protection Unit
Shim, Woo-Sup ; Ryu, Sam-Gon ; Kwon, Tae-Geun ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 1, 2012, Pages 75~80
DOI : 10.9766/KIMST.2012.15.1.075
The integrated protection unit of CHEONGUNG is composed of chemical-biological equipment and air conditioner equiped heating element. The protection capabilities against chemical-biological agent were measured by using simulant agents such as n-Hexane, KM5 Screening Smokes and CS agent. The experimental test results with simulant agents verify the protective performance of the integrated protection unit.
A Study on Thermal Decomposition of RDX According to the Size using TGA
Bum, Kil-Ho ; Kim, Seung-Hee ; Kim, Jin-Seuk ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 1, 2012, Pages 81~85
DOI : 10.9766/KIMST.2012.15.1.081
This work is related to study the thermal decomposition of 1,3,5-trinitro-1,3,5-triazacylohexane(RDX) by differential scanning calorimeter and thermo-gravimetry with Kissinger's & Iso-conversional method under nonisothermal conditions, with heating rate from 2 to
/min or given heating rate. We calculated and compared activation energy with these two methods. Iso-conversional method is better than Kissinger's method to study decomposition mechanism. We also investigated activation energy and frequency factor by Kissinger's & Iso-conversional method with the influence of particle size. In case of single crystal, Cl-3(large crystal) has better thermal stability than Cl-5(small crystal). The activation energy increased according to the size of the particle size.
Development of an Algorithm for Compensating Ground Inclination to Expand an Operational Field of a Missile Launcher
Chung, Jae-Wook ; Kim, Yong ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 1, 2012, Pages 86~92
DOI : 10.9766/KIMST.2012.15.1.086
When missile is launched, a launcher needs to be leveled with accuracy to avoid the systems's instability. In general, a launcher is leveled by adjusting the stroke of leveling jacks; however, it is still challenge to control the leveling jacks fast and accurately. This paper thus proposed an innovative algorithm for compensating ground inclination of a missile launcher to expand operational field of a missile launcher. Using two inclinometers attached on a launcher, a base jack for leveling is selected and the mixed gradient where launcher stands on can be estimated. Due to the limited stroke, the launcher can compensate its ground inclination within maximum stroke margin. Then, the ground inclination of a launcher can be compensated by calculated angle using weighting factors. The effectiveness of proposed algorithm is proved with a prototype missile launcher.
The Reliability-Based Probabilistic Structural Analysis for the Composite Tail Plane Structures
Lee, Seok-Je ; Kim, In-Gul ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 1, 2012, Pages 93~100
DOI : 10.9766/KIMST.2012.15.1.093
In this paper, the deterministic optimal design for the tail plane made of composite materials is conducted under the deterministic loading condition and compared with that of the metallic materials. Next, the reliability analysis with five random variables such as loading and material properties of unidirectional prepreg is conducted to examine the probability of failure for the deterministic optimal design results. The MATLAB programing is used for reliability analysis combined with FEA S/W(COMSOL) for structural analysis. The laminated composite is assumed to the equivalent orthotropic material using classical laminated plate theory. The response surface methodology and importance sampling technique are adopted to reduce computational cost with satisfying the accuracy in reliability analysis. As a result, structural weight of composite materials is lighter than that of metals in deterministic optimal design. However, the probability of failure for the deterministic optimal design of the tail plane structures is too high to be neglected. The sensitivity of each variable is also estimated using probabilistic sensitivity analysis to figure out which variables are sensitive to failure. The computational cost is considerably reduced when response surface methodology and importance sampling technique are used. The study of the computationally inexpensive method for reliability-based design optimization will be necessary in further work.
Analysis of the Interaction Between Side Jet and Supersonic Free Stream Using K-factor
Kim, Min-Gyu ; Lee, Kwang-Seop ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 1, 2012, Pages 101~110
DOI : 10.9766/KIMST.2012.15.1.101
The side jet effects between jet flow and free-stream on a missile body were investigated by experimentally and numerically for modeling aerodynamic coefficients in pitch plane. K-factors for normal force and pitching moment were introduced to estimate the side jet effects. The main parameters of the jet interaction phenomena were angle of attack, jet pressure ratio, Mach number and jet bank angle. The K-factors for normal force coefficient and pitching moment coefficients in pitch plane were analysed.