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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
Selecting the target year
A Research on the MIM Process of High-Precision Fuze Parts
Seo, Jung-Hwa ; Kang, Kyeoung-Hoon ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 3, 2012, Pages 231~240
DOI : 10.9766/KIMST.2012.15.3.231
During the past two decades, Metal Injection Molding(MIM) has become a very competitive technology to fabricate small, precise and complex-shaped parts in large quantities. In this research, the applicability of MIM technology in the mass-production of the high precision fuze parts to save manufacturing cost was investigated. The water-atomized 17-4PH stainless steel powder, one of the best corrosion-resistant high strength materials, was injection-molded into real-shape fuze part and flat tensile specimens. The injection-molded parts were thermally debound in hydrogen gas flow without solvent extraction. Sintering of the debound parts was carried out in vacuum at temperatures ranging from
. The sintering behavior, mechanical properties, dimensional precision, corrosion resistance of the MIMed 17-4PH stainless parts were investigated. It was found that almost all the properties of the MIMed parts were comparable to those of the mechanically machined parts. Also, actual military field tests using both MIMed and mechanically machined fuze parts were performed as well and were found to be very successful.
Performance Analysis of Interior Ballistics using 1-D Numerical Method
Jang, Jin-Sung ; Sung, Hyung-Gun ; Roh, Tae-Seong ; Choi, Dong-Whan ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 3, 2012, Pages 241~249
DOI : 10.9766/KIMST.2012.15.3.241
Performance analysis of the interior ballistics has been conducted using the 1-D numerical code called IBcode according to the various conditions such as length of ignition-gas injector, amount of ignition-gas, mass of projectile, and drag force of projectile. In case of the length of ignition-gas injector, the 25~100 % of the full-injector length has been considered as well as the mass & mass flow of the ignition-gas. The mass of the projectile 5~70 kg and its drag force of 0~69 MPa have been also considered. Variables such as breech & base pressure, negative differential pressure and muzzle velocity for the performance analysis have been sorted, too. Firing conditions for the optimal performance have been investigated through these variables.
Multi-sensor Fusion based Autonomous Return of SUGV
Choi, Ji-Hoon ; Kang, Sin-Cheon ; Kim, Jun ; Shim, Sung-Dae ; Jee, Tae-Yong ; Song, Jae-Bok ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 3, 2012, Pages 250~256
DOI : 10.9766/KIMST.2012.15.3.250
Unmanned ground vehicles may be operated by remote control unit through the wireless communication or autonomously. However, the autonomous technology is still challenging and not perfectly developed. For some reason or other, the wireless communication is not always available. If wireless communication is abruptly disconnected, the UGV will be nothing but a lump of junk. What was worse, the UGV can be captured by enemy. This paper suggests a method, autonomous return technology with which the UGV can autonomously go back to a safer position along the reverse path. The suggested autonomous return technology for UGV is based on multi-correlated information based DB creation and matching. While SUGV moves by remote-control, the multi-correlated information based DB is created with the multi-sensor information; the absolute position of the trajectory is stored in DB if GPS is available and the hybrid MAP based on the fusion of VISION and LADAR is stored with the corresponding relative position if GPS is unavailable. In multi-correlated information based autonomous return, SUGV returns autonomously based on DB; SUGV returns along the trajectory based on GPS-based absolute position if GPS is available. Otherwise, the current position of SUGV is first estimated by the relative position using multi-sensor fusion followed by the matching between the query and DB. Then, the return path is created in MAP and SUGV returns automatically based on the MAP. Experimental results on the pre-built trajectory show the possibility of the successful autonomous return.
A Study on Characteristics of Precession Motion for a Smart Munition
Ha, Do-Jun ; Kim, Byoung-Soo ; Kim, In-Keun ; Song, Ho-In ; Lee, Young-Jae ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 3, 2012, Pages 257~265
DOI : 10.9766/KIMST.2012.15.3.257
This paper presents a study on characteristics of precession motion of a smart munition. It's a kind of the Sensor Fuzed Weapon. The particular thing for the smart munition is that it has precession motion in the air while the sensor is searching the ground to detect ground vehicles such as tanks. The smart munition has a cylindrical shape and has a sensor attached on its side. Due to its non-uniform mass distribution, its center of gravity(CG) is located away from the center of volume(CV). In order for the smart munition to detect the target effectively, the ground searching pattern of sensor should have an uniform circular form, and for this, the precession motion of smart munition should be in its steady-state. Finally, it is necessary to choose the right initial conditions at the moment of firing, for the steady-state precession motion during flight.
A Study on the Extents of Damage of a Bow Structure According to Collision Scenario
Kim, Kui-Me ; Kim, Geun-Won ; Shin, Ki-Su ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 3, 2012, Pages 266~271
DOI : 10.9766/KIMST.2012.15.3.266
The rescue methods for the marine casualties are limited due to the characteristics of operation environment of the vessel. Especially the most of marine accidents have been occurred at the bow structure of ship. Moreover the failure of bow structure may lead to catastrophic mishaps. In this paper, the extents of damage of a bow structure fracture subject to collision accident was investigated by using numerical method. The computer simulation approach by using Finite Element Method was employed to accomplish this goal. A finite element model, a 3D model of ship, has been utilized to evaluate damage of bow structure according to collision scenario. In conclusion, we have demonstrated that the plastic deformation occurred at the bow structure. Also it was shown that the collision angle clearly plays a role in determining amount of damage of ship structures.
Measure of Effectiveness Analysis of Passive SONAR System for Detection
Cho, Jung-Hong ; Kim, Jea-Soo ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 3, 2012, Pages 272~287
DOI : 10.9766/KIMST.2012.15.3.272
The optimal use of sonar systems for detection is a practical problem in a given ocean environment. In order to quantify the mission achievability in general, measure of effectiveness(MOE) is defined for specific missions. In this paper, using the specific MOE for detection, which is represented as cumulative detection probability(CDP), an integrated software package named as Optimal Acoustic Search Path Planning(OASPP) is developed. For a given ocean environment and sonar systems, the discrete observations for detection probability(PD) are used to calculate CDP incorporating sonar and environmental parameters. Also, counter-detection probability is considered for vulnerability analysis for a given scenario. Through modeling and simulation for a simple case for which an intuitive solution is known, the developed code is verified.
A Study on Electromagnetic Environmental Effects(E3) Test and Evaluation of Fighter Equipped with ELINT Pod
Kim, In-Seon ; Park, Young-Ju ; Choi, Dae-Kyu ; Kim, Jang-Pyo ; Lee, Byeong-Nam ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 3, 2012, Pages 288~297
DOI : 10.9766/KIMST.2012.15.3.288
This paper describes the verification test on Electromagnetic Environmental Effects(E3), which conducted on ground as a final step to confirm the normal operation of ELINT pod and Safety-of-Flight of KF-16C/D mounted with ELINT pod prior to the initial flight. Based on MIL-STD-464A, indispensable 7 requirements among 14 detailed requirements total were carried out in the test. Considering the Safety-of-Flight(SOF), we invest a great deal of time and effort on Hazards of Electromagnetic Radiation to Ordnance(HERO) and Intra-system EMC test. E3 test and evaluation were performed on 62 equipments of KF-16C/D, respectively. As a result, we verify that KF-16C/D mounted with ELINT pod(hereafter "system") are electromagnetically compatible among all subsystems and equipment within the system and with environments caused by electromagnetic effects external to the system.
Scene Recognition Using Local and Global Features
Kang, San-Deul ; Hwang, Joong-Won ; Jung, Hee-Chul ; Han, Dong-Yoon ; Sim, Sung-Dae ; Kim, Jun-Mo ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 3, 2012, Pages 298~305
DOI : 10.9766/KIMST.2012.15.3.298
In this paper, we propose an integrated algorithm for scene recognition, which has been a challenging computer vision problem, with application to mobile robot localization. The proposed scene recognition method utilizes SIFT and visual words as local-level features and GIST as a global-level feature. As local-level and global-level features complement each other, it results in improved performance for scene recognition. This improved algorithm is of low computational complexity and robust to image distortions.
Implementation and Evaluation of the Wibro-based Location Identification System for Air Base Protection Force
Pyo, Sang-Ho ; Koo, Jung ; Ko, Young-Bae ; Kim, Ki-Hyung ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 3, 2012, Pages 306~314
DOI : 10.9766/KIMST.2012.15.3.306
This paper proposes a new system to maximize efficiency of Air Base Protection Operations through the development of location identification software. The Wibro-based location identification system for Air Base Protection Force offers Blue Ground Force digitalized character message which is not exposed to enemy. Also, it is possible to automatically provide the location of Blue Ground Force to Air Base Ground Operations Center. The test result proves that this system is very helpful when Air Base Protection Force executes Air Base Protection Operations.
Corrosion Behavior of AZ31 Magnesium Alloy during Machining
Kim, Jae-Hak ; Kwon, Sung-Eun ; Lee, Seung-Jae ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 3, 2012, Pages 315~321
DOI : 10.9766/KIMST.2012.15.3.315
In the study, corrosion characteristics of AZ31 magnesium alloy under various environments exposed during machining(immersion in cutting oil, 5 % cutting oil aqueous solution and distilled water & contact with dissimilar metals, SPC4 and A5052-H32) were investigated. A corrosion test was performed AZ31 magnesium alloy was immersed in each electrolyte solution after contacting with each dissimilar metals, and the results were observed by an electron microscope. In immersion tests, corrosion of AZ31 magnesium alloy showed to be in the sequence of distilled water> 5 % cutting oil aqueous solution> cutting oil> air, and in the test of contact with dissimilar metals, corrosion showed to be in the sequence of SPC4> A5052-H32> AZ31. It can be concluded that to prevent corrosion during machining, AZ31 magnesium alloy must prevent contacting water and use magnesium alloy for raw material of Jig & Fixture.
Differential Choice of Radar Beam Scheduling Algorithm According to Radar Load Status
Roh, Ji-Eun ; Kim, Dong-Hwan ; Kim, Seon-Joo ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 3, 2012, Pages 322~333
DOI : 10.9766/KIMST.2012.15.3.322
AESA radar is able to instantaneously and adaptively position and control the beam, and such adaptive beam pointing of AESA radar enables to remarkably improve the multi-mission capability. For this reason, Radar Resource Management(RRM) becomes new challenging issue. RRM is a technique efficiently allocating finite resources, such as energy and time to each task in an optimal and intelligent way. Especially radar beam scheduling is the most critical component for the success of RRM. In this paper, we proposed a rule-based scheduling algorithm and Simulated Annealing(SA) based scheduling algorithm, which are alternatively selected and applied to beam scheduler according radar load status in real-time. The performance of the proposed algorithm was evaluated on the multi-function radar scenario. As a result, we showed that our proposed algorithm can process a lot of beams at the right time with real time capability, compared with applying only rule-based scheduling algorithm. Additionally, we showed that the proposed algorithm can save scheduling time remarkably, compared with applying only SA-based scheduling algorithm.
A Study of JPDA(Joint Probabilistic Data Association) to Decrease Track Coalescence & Switch in a Cluttered Environments
Song, Dae-Buem ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 3, 2012, Pages 334~342
DOI : 10.9766/KIMST.2012.15.3.334
Data association is important technology which designate final destination in the target tracking. The joint probabilistic data association(JPDA) algorithm provides excellent ability to maintain track on multiple targets. Currently, it is not easily implemented in real time because of track coalescence & switch. The aim of this paper is to develop probabilistic filters that increase JPDA's sensitivity and decrease track coalescence & switch in a cluttered environments.
Development of Target Signal Simulator for Multi-Beam Type FMCW Radar
Lee, Seung-Youn ; Choe, Tok-Son ; Jung, Young-Hun ; Lee, Seok-Jae ; Yoon, Joo-Hong ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 3, 2012, Pages 343~349
DOI : 10.9766/KIMST.2012.15.3.343
To detect targets for autonomous navigation of unmanned ground vehicle, mounted sensors are required to work all-weather condition. In this point of view, the FMCW radar is quietly appropriate. In this paper, we present development results of target signal simulator for multi-beam type FMCW radar. A target signal simulator make pseudo target signals which simulates multiple moving targets. And we describe how to make hit information for each target in multi-beam type radar. The developed methods are utilized for target tracking device. Moreover it can be applied to similar target signal simulator.
A Study on the Stiffened Rectangular Plate under High Velocity Impact
Woo, Dae-Hyun ; Lee, Young-Shin ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 3, 2012, Pages 350~357
DOI : 10.9766/KIMST.2012.15.3.350
The velocity response of stiffened rectangular plate under high velocity impact was studied. Numerical simulation was conducted on the stiffened plate with four stiffeners under various impact positions. Considered stiffener types were rib, I, hat and T stiffener. For the center impact position of I stiffened plate, the simulated residual velocity was 365.6 m/s with the initial projectile velocity 500 m/s. The reinforcing characteristic of I stiffened plate was excellent among four stiffeners.