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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 17, Issue 6 - Dec 2014
Volume 17, Issue 5 - Oct 2014
Volume 17, Issue 4 - Aug 2014
Volume 17, Issue 3 - Jun 2014
Volume 17, Issue 2 - Apr 2014
Volume 17, Issue 1 - Feb 2014
Selecting the target year
A Pyrotechnic Mixture Composition and Design Verification of Bright Flash
Kim, Hyung Jun ; Choi, Sung Wook ; Kwon, Mi Ra ; Hwang, Jun Sik ; Chang, Kwe Hyun ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 3, 2014, Pages 289~295
DOI : 10.9766/KIMST.2014.17.3.289
The composition of bright flash device is a pyrotechnic mixture consisting of metal powder, oxidizer and additives. A pyrotechnic mixture of bright flash device generates a bright flash through burning after being ignited by initiator. The function of bright flash is to distract or incapacitate electro optical sensor systems and enemy eyes temporally. This study is to develop composition of pyrotechnic mixture of bright flash and to analyze the test results by considering intensity and efficiency of light.
A Study on the Motion Analysis of the Wire-guided Underwater Test Body in Natural Supercavitation
Nah, Young-In ; Kim, Sunbum ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 3, 2014, Pages 296~303
DOI : 10.9766/KIMST.2014.17.3.296
This paper describes the simplified simulation method of the wire-guided underwater test body with natural supercavitation. In this paper, the simulation based model of the wire-guided underwater body with natural supercavitation is proposed by using preceding research and commercial flow-analysis software. By using the model, the 1-dimensional wire-guided body motion in natural supercavitation can be solved very fast with reliability. The suggested model is validated by the comparison of simulation results with experimental data.
A Study on the Korea Weather Environment for Icing Airworthiness of Military Helicopter
Hur, Jangwook ; Shin, Baekcheon ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 3, 2014, Pages 304~310
DOI : 10.9766/KIMST.2014.17.3.304
Based on atmosphere weather data by balloon in Osan and Gwangju area, if icing condition occurs in weather environment of altitude range where helicopter is operated was analyzed in quantitative way. Yearly icing occurrence frequency for daytime during recent three years was average 102 days in Osan, average 91 days in Gwangju. Icing weather environment to highly affect operation of helicopter varies a little according to analysis methods but icing intensity at MDT level was calculated in all the methods, and 14.5~38 times was suggested in Osan; 2.5~30 times in Gwangju. Icing at MDT level was calculated in common in all the analysis methods through wide periods such as Jan., Feb., Mar., and Nov. in Osan. In Gwangju, icing at MDT level was suggested focusing on Jan. only. Therefore, military helicopter developed in Korea is required to strive obtaining certificate of airworthiness about icing condition at MDT level for implementation of perfect operational mission and safe operation.
Transmission Characteristics of Curved Reconfigurable Frequency Selective Structure
Lee, In-Gon ; Hong, Ic-Pyo ; Chun, Heoung-Jae ; Park, Yong-Bae ; Kim, Yoon-Jae ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 3, 2014, Pages 311~317
DOI : 10.9766/KIMST.2014.17.3.311
In this paper, the flexible and reconfigurable frequency selective surface for C-band was designed using patch array and grid structure for radome and other curved surface applications. Frequency reconfigurability was obtained by varying the capacitance of varactor diode and flexibility is implemented by using flexible PCB. For the validity of the proposed structure, we fabricated the flexible and reconfigurable frequency selective structure and measured the frequency reconfigurability for different bias voltages and different curvature surfaces from the optimized design parameters. From the measurement results, we know that the proposed structure has the wideband reconfigurable frequency bandwidth of 6.05-7.08GHz. We can apply this proposed structure to the curved surface like as radome of aircraft or warship.
A Study on the Design and Verification-Validation of the Supportive Equipment for Shipyard Test of Naval Combat System
Jung, Youngran ; Kim, Cheolho ; Han, Woonggie ; Kim, Jaeick ; Kim, Hyunsil ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 3, 2014, Pages 318~326
DOI : 10.9766/KIMST.2014.17.3.318
The Shipyard Test of Naval Combat System depends on external factors, such as weather conditions and availability of its sensor-weapon, due to the need of on-board sensor-weapon during the test. This paper suggests the Supportive Equipment using virtual simulator for Shipward Test, in case of the unavailability of the on-board sensor-weapon or the test support force(aircraft, surface ship etc.), to pre-check the functions of the combat system as well as to prepare the Shipyard Test. To mock the real sensor-weapon functions as similar as possible, the Supportive Equipment for Shipyard Test was verified by the Verification and Validation process, which is usually performed while developing models in the Modeling & Simulation field.
A Distributed Dynamic Address Assignment for Tactical Mobile Ad-hoc Networks
Park, Mun-Young ; Lee, Jong-Kwan ; Baek, Ho-Ki ; Kim, Du-Hwan ; Lim, Jae-Sung ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 3, 2014, Pages 327~335
DOI : 10.9766/KIMST.2014.17.3.327
In this paper, we propose a group distributed dynamic address assignment scheme suitable for tactical mobile ad hoc networks(MANET). Efficient address assignment is an important issue in the MANET because a node may frequently leave the current network and join another network owing to the mobility of the node. The conventional schemes do not consider the features of the tactical networks: existence of a leader node and network activity on a group basis. Thus, they may not be suitable for military operations. In our proposed scheme, called grouped units dynamic address assignment protocol(G-DAAP), a leader node maintains the address information for the members in the network and any of the nodes can exploit the information for the assignment or request of the IP address by a simple message exchange procedure. This leads to fast address assignment with small overheads. In addition, G-DAAP based on the modified IEEE 802.11e Enhanced Distributed Channel Access(EDCA) can assign addresses more quickly. We describe the delay performance of the G-DAAP and compare it with conventional schemes by numerical analysis and computer simulations. The results show that the G-DAAP significantly improves the delay performance as compared with the conventional schemes.
A Hybrid ARQ Scheme with Changing the Modulation Order
Park, Bum-Soo ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 3, 2014, Pages 336~341
DOI : 10.9766/KIMST.2014.17.3.336
When using a higher-order modulation scheme, there are variations in bit-reliability depending on the bit position in a modulation symbol. Variations of bit-reliability in the codeword block lower the decoding performance. Also, the decoding performance increases as the sum of the bit-reliabilities in the codeword block increases. This paper presents a novel hybrid automatic repeat request scheme that increases the sum of the reliabilities of the transmitted bits by lowering the modulation order, and decreases the variations of bit-reliability in the codeword block by preferentially retransmitting bits with low reliability. The proposed scheme outperforms the constellation rearrangement scheme. Furthermore, the proposed scheme also provides a good solution in cases where the size of the retransmission block is smaller than the size of the initial transmission block.
Methodology of System Alignment using Angular Error Compensation Among Multi-Axes
Ha, Jong-Soo ; Lee, Eui-Hyuk ; Lee, Hyun-Ah ; Park, Gyu-Churl ; Cho, Kyu-Gong ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 3, 2014, Pages 342~349
DOI : 10.9766/KIMST.2014.17.3.342
MRDS is a short range missile/rocket defense system which protects a main battle tank(MBT) from threats in a short range. It is composed of 2 radars, 2 infrared trackers(IRTs), 1 fire control computer(FCC), 2 launchers and countermeasures. To guarantee the performance of the MRDS, these components have to be mounted on the vehicle with the known positions and directions and it is required to compensate the alignment errors. In this paper, a system alignment method using angular error compensation is proposed to install its components within a tolerance on the MBT. The test results are presented to evaluate and verify the effectiveness of the proposed method.
Performance Analysis of Missile/Rocket Defense System for RPG-7 Defense of Main Battle Tank
Ha, Jong-Soo ; Lee, Eui-Hyuk ; Lee, Hyun-Ah ; Park, Gyu-Churl ; Cho, Kyu-Gong ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 3, 2014, Pages 350~357
DOI : 10.9766/KIMST.2014.17.3.350
MRDS is a short range missile/rocket defense system which protects a main battle tank(MBT) from threats at a short range. It is composed of 2 radars, 2 infrared trackers(IRT)s, 1 fire control computer(FCC), 2 launchers and countermeasures. In this paper, the radar and the IRT models based on sensing errors, the FCC model based on filtering errors, the launcher model based on driving errors and the countermeasure model based on flying errors are proposed to analyze the defense performance with the approaching RPG-7 and the moving MBT. The simulation results are presented to evaluate and verify the effectiveness of the proposed method.
Two Attribute-based Broadcast Encryption Algorithms based on the Binary Tree
Lee, Moon Sik ; Kim, HongTae ; Hong, Jeoung Dae ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 3, 2014, Pages 358~363
DOI : 10.9766/KIMST.2014.17.3.358
In this paper, we present two constructions of the attribute-based broadcast encryption(ABBE) algorithm. Attribute-based encryption(ABE) algorithm enables an access control mechanism over encrypted data by specifying access policies among private keys and ciphertexts. ABBE algorithm can be used to construct ABE algorithm with revocation mechanism. Revocation has a useful property that revocation can be done without affecting any non-revoked uers. The main difference between our algorithm and the classical ones derived from the complete subtree paradigm which is apt for military hierarchy. Our algorithm improve the efficiency from the previously best ABBE algorithm, in particular, our algorithm allows one to select or revoke users by sending ciphertext of constant size with respect to the number of attributes and by storing logarithm secret key size of the number of users. Therefore, our algorithm can be an option to applications where computation cost is a top priority and can be applied to military technologies in the near future.
Template Matching-Based Target Recognition Algorithm Development and Verification using SAR Images
Lim, Ho ; Chae, Daeyoung ; Yoo, Ji Hee ; Kwon, Kyung-Il ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 3, 2014, Pages 364~377
DOI : 10.9766/KIMST.2014.17.3.364
In this paper, we have developed a target recognition algorithm based on a template matching technique using Synthetic Aperture Radar (SAR) images. For efficient computations, Radon transform-based azimuth estimation algorithm was used with the template matching. MSTAR data set was divided into two groups according to the depression angles, which were a train set and a test set. Template data were generated by rotating and cropping chips which were from MSTAR train set using the azimuth estimation algorithm. Then the template matching process between test data and template data was performed under various conditions. Performance variation according to contrast enhancement preprocessing which is scarce in open literature was also presented. The analysis results show that the target recognition algorithm could be useful for the automatic target recognition using SAR images.
A Study on Safety Evaluation Method of Lithium Secondary Battery Module for Military Operation
Yoo, Eun Ji ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 3, 2014, Pages 378~386
DOI : 10.9766/KIMST.2014.17.3.378
In this paper, safety evaluation method simulating battlefield environment was studied to verify military operability of commercial lithium secondary battery. Based on the MIL-STD-2105D and STANAG standards, safety tests of lithium secondary battery module were conducted, such as bullet impact, fragment impact, fast cook-off and slow cook-off. All results satisfied the safety evaluation criteria, founded on military standard. It suggests that the lithium secondary module has high potential to be applied in a military power source. The safety evaluation methods developed in this paper can be valuable to propose the new military standards for commercial lithium secondary batteries.
Aft-Igniter Performance related to the Formulation and the Shape of Ignition Charge
Jung, Jin-Suk ; Ahn, Gil-Hwan ; Jang, Seung-Gyo ; Ryu, Byung-Tae ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 3, 2014, Pages 387~393
DOI : 10.9766/KIMST.2014.17.3.387
The combustion pressure and thrust of aft-igniter were measured to investigate the characteristics of ignition charge. Granule and pellet shape ignition charge of
and MTV(Magnesium-Teflon-Viton) were used for igniters. Ignitions with granule charges show abrupt increases of combustion pressure and thrust compared to those of pellet charge.
igniter shows higher combustion pressure than MTV igniter due to higher combstion rate. Mg particle size affects the combustion pressure of MTV igniter.