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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 12, Issue 6 - Dec 2009
Volume 12, Issue 5 - Oct 2009
Volume 12, Issue 4 - Aug 2009
Volume 12, Issue 3 - Jun 2009
Volume 12, Issue 2 - Apr 2009
Volume 12, Issue 1 - Feb 2009
Selecting the target year
A Study on Designing Link Type Percussion Lock
Lee, Joon-Ho ; Yeo, Woon-Joo ; Choe, Eui-Jung ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 3, 2009, Pages 259~265
In the traditional percussion locks of small arms, a firing pin is struck by a hammer rotating on a single center of rotation, which makes the percussion mechanism simple and reliable. In order to strike the firing pin by the hammer, however, the firing pin should be located within the radius of rotation of the hammer. As the distance between the striking point of the firing pin and the center of rotation of the hammer becomes longer, the radius of rotation of the hammer should also be increased, which results in the increase of the volume and weight of the small arms because the hammer needs the more space for its operation inside of the small arms. In this paper, a link type percussion lock was newly proposed in order to overcome the limitation of designing small arms when using traditional percussion locks, as mentioned above. The link type percussion lock was modeled by using multi-body dynamics software and designed to satisfy the requirements such as striking force level of the hammer exerting on the firing pin enough to detonate the percussion cap of ammunitions and the safety on the accidental drop. It was applied to the newly developed dual-barrel weapon system, in which the weight and overall length are important design factors, and verified by durability test and drop test on the ground.
Vibration Analysis of a Heavy Truck via Road Tests
Song, Oh-Seop ; Nam, Kyung-Mo ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 3, 2009, Pages 266~271
Electronic equipments and a missile carried by heavy trucks are often subjected to vibration and shock excitation during their transportation. Electronic equipments are so vulnerable to vibration and shock input that it is necessary to know in advance the vibration level of the truck which cause the damage of equipments. Road tests of a heavy truck carrying a canister on different road conditions such as paved road, unpaved road, and washboard are performed and the effect of road conditions on the vibration characteristics are analyzed. Vibration levels were measured at various locations of the truck along the path through which vibration was transmitted. This study reveals that the velocity of the truck as well as the road surface conditions are main factors which affect the vibration levels of the truck. The power spectrum density of the measured vibration signal and the factors affecting the PSD are also analyzed in this paper.
Performance Comparison of 3-D Optimal Evasion against PN Guided Defense Missiles Using SQP and CEALM Optimization Methods
Cho, Sung-Bong ; Ryoo, Chang-Kyung ; Tahk, Min-Jea ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 3, 2009, Pages 272~281
In this paper, three-dimensional optimal evasive maneuver patterns for air-to-surface attack missiles against proportionally navigated anti-air defense missiles were investigated. An interception error of the defense missile is produced by an evasive maneuver of the attack missile. It is assumed that the defense missiles are continuously launched during the flight of attack missile. The performance index to be minimized is then defined as the negative square integral of the interception errors. The direct parameter optimization technique based on SQP and a co-evolution method based on the augmented Lagrangian formulation are adopted to get the attack missile's optimal evasive maneuver patterns. The overall shape of the resultant optimal evasive maneuver is represented as a deformed barrel-roll.
Estimation of Equivalent Circuit Parameters of Underwater Acoustic Piezoelectric Transducer for Matching Network Design of Sonar Transmitter
Lee, Jeong-Min ; Lee, Byung-Hwa ; Baek, Kwang-Ryul ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 3, 2009, Pages 282~289
This paper presents an estimation technique of the equivalent circuit parameters for an underwater acoustic piezoelectric transducer from the measured impedance. Estimated equivalent circuit can be used for the design of the impedance matching network of the sonar transmitter. A fitness function is proposed to minimize the error between the calculated impedance of the equivalent circuit and the measured impedance of the transducer. The equivalent circuit parameters are estimated by using the fitness function and the PSO(Particle Swarm Optimization) algorithm. The effectiveness of the proposed method is verified by the applications to a sandwich-type transducer and a dummy load. In addition, the impedance matching network is also designed by using the estimated equivalent circuit model.
A Study on the System Requirement Development Process Improvement in Defense R&D Programs
Kim, Jung-Myong ; Park, Young-Won ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 3, 2009, Pages 290~298
This paper proposes a novel process which can develop the system requirements in defense R&D programs. As the weapon systems become more complicated, the success and effectiveness of R&D outcome heavily depend on the application and tailoring of systems engineering process and methods. And, the accuracy and quality of system requirements are essential prerequisite to leverage the systems engineering process. To produce the artifacts of systems engineering such as OCD, ORD, and the systems requirements, the system user can write out requirement document using the proposed implementation process and templates without expending heavy work loads.
An Evaluation Model Development of Technology Green Index(TGI) and It's Application to Defense R&D Projects
Choi, Don-Oh ; Lee, Hyo-Keun ; Lim, Jong-Kwang ; Lee, Hun-Gon ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 3, 2009, Pages 299~308
In this paper, we have developed an evaluation model of technology green index(TGI) which includes 3 evaluation factors and 13 indicators. Furthermore, as presenting the degree of relative importance among evaluation factors and indicators for all R&D evaluation stages and all green technology areas, and applying the proposed model to 5 defense projects, we have found applicability of the model to evaluation of defense R&D projects. The results of evaluation using this model can be used to monitor the performance of project life cycle and develop R&D investment strategy of green technology using portfolio analysis.
A Study on Performance Risk Measurement for the Defense R&D Program
Choi, Myung-Jin ; Na, Ho-Young ; Lee, Sang-Heon ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 3, 2009, Pages 309~316
The risk management is a method to identify and to handle risk factors. In this paper, we introduce a methodology that can be used to measure of system's performance risk by combining system's TPM(technical performance measures) in the R&D(research and development) program for defense acquisition. By applying the suggested procedure, we can monitor risk trends in R&D program by calculation of system's overall TPM and find out where management should target to reduce or remove the system's performance risk.
An Efficient Key Management Scheme in Tactical Ad-Hoc Network
Kim, Eun-Ho ; Lee, Soo-Jin ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 3, 2009, Pages 317~324
Tactical Information Communication Network(TICN) uses both a wireless and wired network. To support mobility in battlefield environments, the application of Ad-hoc networking technology to its wireless communication has been examined. However, Ad-hoc network is faced to many security threats due to its intrinsic characteristics. Therefore, to apply the Ad-hoc networking technology to battlefield environments and TICN, an intensive study on security countermeasure must go side by side with the development of enabling technology. In this paper, we suggest an efficient key management scheme for TICN of which the Ad-hoc networking technology is applied.
A Study on the Investigation and Analysis of Defense Information Technical Standard Application
Kim, Hye-Lyeong ; Choi, Sang-Yeong ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 3, 2009, Pages 325~332
This study is aimed to investigate the application of DITA(Defense Information Technical stAndard) on the weapon information systems and defense management information systems in order not only to update the current DITA version 4.0, but also to develop SoS(System of systems) interoperability policy in the armed forces of Korea. For this study, 18 information systems were considered, their development products(System/Sub-system Specification, Technical architecture View, System Interoperability Test and Evaluation products) were reviewed and analysed. As a result of the investigation and analysis, it was found that the 44% of the DITA standard profiles were used for the development of the defense information systems. We conclude that DITA should be updated to be a minimal set so that all the defense information systems should be DITA-compliant. And it should be reviewed periodically to reflect the new information technology.
Detection and Management of Misbehaving Node in Tactical Ad-Hoc Networks
Jang, Beom-Geun ; Lee, Soo-Jin ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 3, 2009, Pages 333~343
Tactical Information Communication Network(TICN) is a concept-type integrated Military Communication system that enables precise command control and decision making by unifying the diversified military communication network and conveying diverse range of battle field information on real-time, at right place at right time. TICN is designed to advance into high speed, large capacity, long distance wireless relay transmission. To support mobility in battlefield environments, the application of Ad-hoc networking technology to its wireless communication has been examined. Ad-hoc network is consist of mobile nodes and nodes in the network depends on the cooperation of other nodes for forwarding of packets. In this context, some non-cooperating nodes may delay forwarding of packets or drop the packets. This may hamper the network as a whole and disrupt communication between the cooperating nodes. To solve this problem, we present a solution with a Node Weight Management Server(NWMS), which manages each node's weight according to its behavior in local area. When the NWMS detects misbehaving node, it increases the node's weight. If the node's weight exceeds a predefined threshold then the NWMS broadcasts the node's information into network to isolate the misbehaving node from the network. These mechanisms show that they are highly effective and can reliably detect a multitude of misbehaving node.
Design of Process Support System based on CMMI
Choi, Dong-Hee ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 3, 2009, Pages 344~353
In this paper, I have proposed a design of process support system based on CMMI process which can support integrated management and repository for CMMI model processes. The system assists small organization to improve business process and offers institutionalized automatic environment to users for use of CMMI processes. The proposed system also can enhance quality and productivity of project by including features such as convenience of project management, planned project administration and steady process improvement.
Design of Autocoast Tracking Algorithm by the Prediction of Target Occlusion and its On-Based Implementation
Kim, So-Hyun ; Jang, Gwang-Il ; Kwon, Kang-Hoon ; Jung, Jin-Hyun ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 3, 2009, Pages 354~359
In this paper, the Autocoast algorithm is proposed for EOTS to overcome the target occlusion status. Coast mode, one of tracking modes, is to maintain the servo slew rate with the tracking rate right before the loss of track. The Autocoast algorithm makes decision of entering coast mode by the prediction of target occlusion and tries to refind target after the coast time. This algorithm composes of 3 steps, the first step is the prediction process of the occlusion by target-like background, the second one is the check process of the occlusion happened after background intensity variation, and the last one is the process of refinding target. The result of computer simulation, test under laboratory, and real test with EOTS shows the applicability for the automatic video tracking system.
A Theoretical Design of RADANT Lens
Lee, Kee-Oh ; Park, Dong-Chul ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 3, 2009, Pages 360~367
In this paper, the RADANT phase scanning scheme and the transmission-type loaded line phase shifter scheme, which are applicable to the phased array systems, are studied. Using these two schemes, a theoretical method to design an electronic beam steering RADANT lens is introduced. The validity of the presented theoretical method is verified through the simplified circuit simulation results.
A Study on the SDINS's Gyro Bias Calibration Method in Disturbances
Lee, Youn-Seon ; Lee, Sang-Jeong ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 3, 2009, Pages 368~377
In this paper we study the gyro bias calibration method of SDINS(Strap-Down Inertial Navigation System). Generally, SDINS's calibration is performed in 2-axis(or 3-axis) rate table with chamber for varying ambient temperature. We assumed that the majority of calibration-parameter except for gyro bias is knowned. During gyrobias calibration procedure, it can be induced some disturbances(accelerometer's short-term error induced rate table rotation and anti-vibration mount's rotation). In these cases, old gyro-bias calibration methods(using velocity error or attitude error) have an error, because these disturbances are not detectable at the same time. So that, we propose a new gyro-bias calibration method(heading error minimizing using equivalent linear transformation) that can detect anti-vibration mount's rotation. And we confirm efficiency of the new gyro-bias calibration method by simulation.
The Research on Development of Flexible Linear Shaped Charge
Park, Byung-Chan ; Chang, Il-Ho ; Lee, Woo-Jin ; Jeon, Jin-Cheol ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 3, 2009, Pages 378~387
The shaped charge consists of the cast or pressed explosive and the metal liner. The pressure formed in detonation wave is so high that the liner is collapsed and the jet of high temperature, pressure and velocity is produced. The jet penetrates the target. In this paper, the simulation for optimization of flexible linear shaped charge(FLSC) was carried out by AUTODYNE program. Based on the results of simulation, we made a prototype of FLSC and evaluated penetration performance, flexibility and its application. The test result of prototype was compared with that of simulation.
Study on Analysis of Driving Torque and Reduction for Naval Surveillance Radar Antenna
Kim, Seung-Woo ; Yang, Yun-Suk ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 3, 2009, Pages 388~395
Surveillance Radar System for naval vessels is a primary core sensor for command and fire control, and provides CFCS(Command and Fire Control System) information for 3-D surveillance and fire control. It's composed of Antenna, Transmitter/Receiver, Signal Processor, and Air drier, which are installed on and under deck. They should be designed and produced in order to endure at any operating circumstances. This paper analyzes load of a driving part for driving the antenna considering factors under external operating circumstances, and proposes a condition of load for maintaining fixed RPM through analyzing internal load of the driving part, and how to reduce the load to meet the condition. This paper is verified through experimental studies.
An Experimental Study on the Performance Prediction Logic for a Regenerative Cooling System
Jung, Se-Yong ; Lee, Yang-Suk ;
Journal of the Korea Institute of Military Science and Technology, volume 12, issue 3, 2009, Pages 396~405
The experimental research was conducted to setup a performance prediction logic for the regenerative cooling system on a small scale liquid rocket engine using kerosene and LOX. Total heat flux of the combustion gas side was determined for the flow rate of the coolant, combustion pressure using the calorimeter thrust chamber. Based on the experimental investigation, a performance prediction scheme for the regenerative cooling system is setup in our own way. A performance prediction logic for the regenerative cooling system has been developed by the correction scheme of the combustion gas side. The key parameters determining the temperature limitation of the coolant are the mass flow rate of the coolant and the length of the combustion chamber and the nozzle. And the parameters to control the limitation of the usable wall temperature are the number of channels and wall thickness.