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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 18, Issue 6 - Dec 2015
Volume 18, Issue 5 - Oct 2015
Volume 18, Issue 4 - Aug 2015
Volume 18, Issue 3 - Jun 2015
Volume 18, Issue 2 - Apr 2015
Volume 18, Issue 1 - Feb 2015
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The Optimal Design Technique for Improving Durability of Spline Shaft of the Self Propelled Artillery' Generator
Kim, Byeong Ho ; Kang, Hyen Jae ; Park, Young Il ; Seo, Jae Hyun ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 5, 2015, Pages 485~491
DOI : 10.9766/KIMST.2015.18.5.485
In this study, the experimental and analytical investigation on structural integrity evaluation of spline shaft of self propelled artillery' generator were carried out. For this work, macro and microstructure fractography of spline shaft were observed. According to the results of the structure analysis and simulation, the shaft was redesigned and optimized. To improve the stiffness and shear stress, the material was changed from the SNCM220 to SNCM439 and surface roughness and protective coating treatment are changed to increase the stress relaxation, respectively. From the result of the torsion test of shaft and accelerated life test of generator, the shaft of a SNCM439 with heat-treatment(Q/T) and electroless nickel plating was superior quality reliability and durability than the others. Therefore, modeling and simulation corresponded well with the experimental result and structural safety was confirmed by generator performing.
Improvement of Engine Stall by Load Increment on Tracked Armored Vehicles
Moon, Tae-Sang ; Kim, Kyungro ; Lee, Yuki ; Kang, Taewoo ; Kim, Jaekyu ; Kim, Seongil ; Park, Bongsik ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 5, 2015, Pages 492~497
DOI : 10.9766/KIMST.2015.18.5.492
Currently, there are many kinds of tracked armored vehicles in service and they have encountered various environment and situations. So there are many obstacles to operate them improperly such as an engine stall. The causes of engine stall are an insufficient fueling, a mixture of air-fuel or vapor lock, and load increment which results from a rapid steering or increasing a viscosity of lubricant by low temperature. In this paper, engine stall by load increment due to a rapid steering or increasing of lubricant viscosity on tracked armored vehicles is analyzed, the ways to prevent it are applied, and their degrees of improvement are evaluated.
The Study of an Automatic Tracking and Pointing Method and the Regarding System for Facing Two Antennas
Gimm, Hak In ; Cho, Sung Hoon ; Lee, Chong Hyo ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 5, 2015, Pages 498~509
DOI : 10.9766/KIMST.2015.18.5.498
The existing mobile antenna networks in the military use have been operated by the manual pointing between two antennas. The work presented here describes the study of ATPC(Automatic Tracking and Pointing Control) system between facing antennas and the related tracking and pointing performances. This system is able to automatically track the maximum RSSI(Received Signal Strength Indication) value from the source's RF(Radio Frequency) signal and then control for maintaining the LOS(Line of Sight) between two antennas. The system has three major units; the driving unit consisting of motors, harmonic drives and encoders, the sensor unit with a GPS(Global Positioning System) and AHRS(Attitude and Heading Reference System) and the control unit regulating all the tracking and pointing events. By using PI(Proportional and Integral) controller, this system is able to properly track and point the other antenna under the external disturbance like the wind load. Both the simulation and the experimental works have been successively carried out to prove the performances of the system.
A Method to Detect Object of Interest from Satellite Imagery based on MSER(Maximally Stable Extremal Regions)
Baek, Inhye ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 5, 2015, Pages 510~516
DOI : 10.9766/KIMST.2015.18.5.510
This paper describes an approach to detect interesting objects using satellite images. This paper focuses on the interesting objects that have common special patterns but do not have identical shapes and sizes. The previous technologies are still insufficient for automatic finding of the interesting objects based on operation of special pattern analysis. In order to overcome the circumstances, this paper proposes a methodology to obtain the special patterns of interesting objects considering their common features and their related characteristics. This paper applies MSER(Maximally Stable Extremal Regions) for the region detection and corner detector in order to extract the features of the interesting object. This paper conducts a case study and obtains the experimental results of the case study, which is efficient in reducing processing time and efforts comparing to the previous manual searching.
A Study on Target Tracking Filter Architecture in Underwater Environment using Active and Passive Sensors
Lim, Youngtaek ; Suh, Taeil ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 5, 2015, Pages 517~524
DOI : 10.9766/KIMST.2015.18.5.517
In this paper, we propose a new target tracking filter architecture using active and passive sensors in underwater environment. A passive sensor for target tracking needs a bearing measurement of target. And target tracking filter for using passive sensor has the observability problem. On the other hand, an active sensor does not have the problem associated with system observability problem because an active sensor uses bearing and range measurement. In this paper, the tracking filter algorithm that could be used in the active and passive sensor system is proposed to analyze maneuvering target and to improve target tracking performance. The proposed tracking filter algorithm is tested by a series of computer simulation runs and the results are analyzed and compared with existing algorithm.
A Study on the Impact Sensing Device for Improving the Firing Function Reliability of ESAF
Jo, Seyoung ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 5, 2015, Pages 525~531
DOI : 10.9766/KIMST.2015.18.5.525
In this paper, a novel impact sensing device for an ESAF(Electronic Safe and Arming Fuze) is presented. An impact sensing device is mounted in front of a weapon, and it detects an impact when it crashes against a target. There are two main design requirements to enhance the firing functional reliability of the ESAF; an operational reliability and a reduced latency, which is a delay time needed for sensing the impact. The design method of the contact-type impact sensing device, which employs an FPCB(Flexible Printed Circuit Board) so it can be used other weapons, is proposed. The tests demonstrated that the design described in this work show a reduced delay time with ensuring the operational reliability.
Target Range Estimation Method using Ghost Target in the Submarine Linear Array Sonar
Choi, Byungwoong ; Kim, Kyubaek ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 5, 2015, Pages 532~537
DOI : 10.9766/KIMST.2015.18.5.532
In this paper, we propose target range estimation method using ghost target in the submarine linear array sonar. Usually, when submarine detect target, they use passive sonar detection to avoid self-disclosure by active sonar transmission. But, originally, passive linear array sonar have limitation for target range estimation and additional processing is required to get target range information. For the case of near-field target, typical range estimation method is using multiple information by multipath effect in underwater environment. Acoustic signal generated from target are propagated along with numerous multipath in underwater environment. Since multipath target signals received in the linear array sonar have different conic angles each other, ghost target is appeared at the bearing different with real target bearing and sonar operator can find these information on the operation console. Under several assumption, this geometric properties can be analysed mathematically and we get the target range by derivation of this geometric equations using measured conic angles of real target and ghost target.
Optimal Deployment of Sensor Nodes based on Performance Surface of Acoustic Detection
Kim, Sunhyo ; Kim, Woojoong ; Choi, Jee Woong ; Yoon, Young Joong ; Park, Joungsoo ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 5, 2015, Pages 538~547
DOI : 10.9766/KIMST.2015.18.5.538
The goal of this study is to develop an algorithm to propose optimal deployment of detection sensor nodes in the target area, based on a performance surface, which represents detection performance of active and passive acoustic sonar systems. The performance surface of the active detection system is calculated from the azimuthal average of maximum detection ranges, which is estimated with a transmission loss and a reverberation level predicted using ray-based theories. The performance surface of the passive system is calculated using the transmission loss model based on a parabolic equation. The optimization of deployment configurations is then performed by a hybrid method of a virtual force algorithm and a particle swarm optimization. Finally, the effectiveness of deployment configurations is analyzed and discussed with the simulation results obtained using the algorithm proposed in this paper.
Quantitative Analysis on Chemisorption of NaDDTC as Organic Compound containing Sulfur for Cu-Ni Alloy
Jung, Gilbong ; Kim, Dongyung ; Jang, Yohan ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 5, 2015, Pages 548~557
DOI : 10.9766/KIMST.2015.18.5.548
This paper is results on Chemisorption of organic compound for the sea water fire fighting line of naval vessels. The quantitative analysis of Chemisorption has been investigated in seawater after immersion in 0.1 % of NaDDTC solutions for 43 hours. The morphology and topography were investigated by FE-SEM and AFM. The chemical elements were analyzed by SEM-EDS, XPS and the depth of chemical elements was measured by depth profiles. The effect of NaDDTC comes from Chemisorption between Copper and Sulfur of NaDDTC. As a result, test results showed that sulfur is helpful to protect a corrosion of seawater line.
Methodologies to Decide the Number of Samples and to Verify an Accuracy Rate of the Precise Guided Missiles for Test and Evaluation
Lee, Moon-gul ; Hwang, Seung-hoon ; Baek, Seung-Ryoung ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 5, 2015, Pages 558~565
DOI : 10.9766/KIMST.2015.18.5.558
The current methods, such as Binomial Probability Distribution or T-test, to calculate the number of samples of Precise Guided Missiles(PGMs) for test and evaluation are statistically problematic to make reasonable decisions thus use the budget efficiently. Also, the method to verify an accuracy rate of the PGMs using these old methods seems to be lack of objectiveness. This paper presents an effective, efficient solution adapted from the clinical medicine testing method of healthcare industry research, which may overcome our problems. This method considers and addresses both manufacturers' and consumers' risk simultaneously. By taking into account the weapon system project characteristics which take a relatively longer time and require higher-level budget, this approach also suggests a reasonable and feasible method to determine the amount of samples of the PGMs and making a criterion to verify an accuracy rate of the missiles that are required to test. Thus, this method is expected to contribute to acquisition and operations of high-reliability PGMs by MND and its field-users.
A Study on the Improvement of Penetration Capability of a Shaped Charge by Controlling the Jet Mass Parameters
So, Byeongkwan ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 5, 2015, Pages 566~573
DOI : 10.9766/KIMST.2015.18.5.566
The most important factor for the penetration performance of shaped charge is the liner design. By designing the liner to have properties of both high jet tip velocity and long jet break-up time, the better penetration performance could be acquired. Usually it is very difficult to satisfy above two conditions simultaneously. In this study, the liner with the shape of ogive was developed to have relatively larger jet mass compared to the conventional trumpet liner. The designed shaped charge showed jet properties with high jet tip velocity and long jet break-up time by using ogive liner and wave shaper. A commercially available hydro-dynamic code AUTODYN-2D was used for numerical analysis of jet formation. The flash X-ray test and the static penetration test were conducted to verify the results of numerical analysis.
The Effect of High Current Pulse against Shaped Charge Jet by Flash X-Ray and Residual Penetration Depth
Joo, Jaehyun ; Choi, Joonhong ; Kim, Dongkyu ; Kim, Siwoo ; Kim, Jeongtae ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 5, 2015, Pages 574~581
DOI : 10.9766/KIMST.2015.18.5.574
In this paper, the effect of high voltage current pulse against shaped charge jet was analyzed through the visualization of jet behavior using flash X-ray and comparison of depth of penetration(DOP) into RHA(Rolled Homogeneous Armor) witness plates. The behavior of jet particles has been acquired using a flash X-ray equipment when current pulse was applied into the metal jet of a shaped charge(SC) warhead. Typical results such as jet breakup and radial jet dispersion, which are due to electromagnetic pressure by current pulse, have been obtained. Dozens of penetration experiments using a shaped charge with 55 mm diameter were performed according to various combinations of major parametric variables such as electrode spacing, standoff distance from SC warhead to electrode, and charge voltage. Subsequently, interrelations between major parametric variables and DOPs into RHA were analyzed.
Design of a HLA/RTI-based Federation Architecture Between OneSAF and NBC Contamination Prediction Models
Han, Sang Woo ; Pyun, Jai Jeong ; Shim, Woo Sup ; Chung, Hoe Young ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 5, 2015, Pages 582~593
DOI : 10.9766/KIMST.2015.18.5.582
For military training and course-of-action analysis, OneSAF Int'l version being used in ROK Army has a limited capability to simulate NBC(nuclear, biological, and chemical) damages. For high-fidelity NBC combat simulation, it is required to visualize NBC contamination dispersion in consideration of weather conditions and terrain characteristics. However, OneSAF itself handling interaction among thousands of combat entities cannot carry out a simulation of NBC contamination dispersion because it brings about an excess burden. To resolve this problem, this research aims to design simulation federation for analysis on NBC operational effects. After examining design consideration to connect OneSAF and a NBC contamination dispersion model, we design a federation architecture that facilitates the interaction between OneSAF and a NBC contamination dispersion model. Afterwards, we implement a federation interface to share simulation data by publish-subscribe pattern and to translate them into the proprietary format for each model. We prove the possibility of federation between both models, as showing that dispersion of NBC contaminated cloud and changes in concentration are reflected in OneSAF-based engagement simulation.
A Study on the Automatic Assembly/Disassembly Procedure for Generating Maintenance Guideline
Heo, Gilhwan ; Lee, Won ; Kwon, Kisang ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 5, 2015, Pages 594~601
DOI : 10.9766/KIMST.2015.18.5.594
The purpose of this research is to propose a maintenance support system for deciding assembly sequence of the product and appropriate tools that are used to assembly and disassembly of parts in the product when geometric properties of the product. The digital maintenance system (DMS) is developed to generate the maintenance guideline and the initial experiment is conducted especially for an underwater weapon system with cylindrical structure. DMS considers four factors to find the efficient assembly and disassembly procedure automatically: (1) assembly tree, (2) properties of each part, (3) distance from the center of the product, and (4) volume. Based on the factors, DMS simulate the movement of each tool virtually and the properties of tools are investigated to find an appropriate tool for using assembly and disassembly of each part in the product. The proposed approach integrates modeling, simulation, data configuration, and virtual reality to allow a development of preliminary maintenance guidance.
M&S Software Design of Multiple Radio Positioning Integration System
Koo, Moonsuk ; Kim, YoungJoon ; Choi, Kwang-Ho ; So, Hyoungmin ; Oh, Sang Heon ; Kim, Seong-Cheol ; Lee, Hyung-Keun ; Hwang, Dong-Hwan ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 5, 2015, Pages 602~611
DOI : 10.9766/KIMST.2015.18.5.602
Even though GNSS provides highly accurate navigation information all over the world, it is vulnerable to jamming in the electronic warfare due to its weak signal power. The United States and Korea have plans to use terrestrial navigation systems as back-up systems during outage of GNSS. In order to develop back-up systems of GNSS, an M&S software platform is necessary for performance evaluation of various vehicle trajectories and integrated navigation systems. In this paper a design method of an M&S software is proposed for evaluation of multiple radio positioning integration systems. The proposed M&S software consists of a navigation environment generation part, a navigation algorithm part, a GUI part and a coverage analysis part. Effectiveness of the proposed design method is shown by implementing an M&S software for the GPS, DME and eLoran navigation systems.
Deep UV Raman Spectroscopic Study for the Standoff Detection of Chemical Warfare Agents from the Agent-Contaminated Ground Surface
Choi, Sun-Kyung ; Jeong, Young-Su ; Lee, Jae Hwan ; Ha, Yeon-Chul ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 5, 2015, Pages 612~620
DOI : 10.9766/KIMST.2015.18.5.612
Short-range detection of chemical agents deposited on ground surface using a standoff Raman system employing a pulsed laser at 248 nm is described. Mounted in a vehicle such as an NBC reconnaissance vehicle, the system is protected against toxic chemicals. As most chemicals including chemical warfare agents have unique Raman spectra, the spectra can be used for detecting toxic chemicals contaminated on the ground. This article describes the design of the Raman spectroscopic system and its performance on several chemicals contaminated on asphalt, concrete, sand, etc.