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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
M&S Case Study for Information Sharing Enabled Combat Entities
Kho, Younghoon ; Lim, Byungyoun ; Park, Sangchul ; Kwon, Yongjin ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 4, 2014, Pages 395~403
DOI : 10.9766/KIMST.2014.17.4.395
Recent technological advancement has a profound effect on the ways that the war is being conducted and fought. The advanced communications, information, computing and sensor technologies enable the combat units to be integrated in the battlefield management network. By exchanging and sharing real-time battlefield information that is critical for the successful outcome of military engagement, the legacy forces are becoming much more effective and lethal than ever before, The bigger picture of such phenomena can be summarized as the concept of Network Centric Warfare(NCW). The main purpose of this study is to compare the outcome of regional combat engagement between the legacy forces and the future combat systems(FCS). The FCS capitalizes on the advanced technologies within the frame of NCW. This study uses the modeling and simulation methodology to assess the effectiveness of two different combat forces. The simulation results show that the FCS is more effective, hence vindicating the superiority of technologically advanced combat units.
The Design of Squib Circuit using Hybrid Interlock
Jang, Bu-Cheol ; Cho, Kil-Seok ; Shin, Jin-Beom ; Koo, Bong-Joo ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 4, 2014, Pages 404~412
DOI : 10.9766/KIMST.2014.17.4.404
We proposed a design method for squib current supply & interlock circuits in guided-missile fire control systems. In order to design squib current supply circuits, various missile squib loads including line resistance and squib devices have to be considered in advance minimizing probability of redesign of circuits and reducing the development cost by implementing the most proper squib current supply circuit. Also, we presented a hardware interlock logic instead of the commonly used software safety logic to improve the safety of guided-missile fire control systems. The proposed squib interlock circuit enhances safety requirements of guided-missile fire control systems. We confirmed that simulation and measurement results of the proposed design method are the same as theoretical analysis results.
Effects on Tensile Strength of Base and Weld Metal of Ti-6Al-4V Alloy in Short Time Exposure to High Temperature
Chae, Byoung-Chan ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 4, 2014, Pages 413~421
DOI : 10.9766/KIMST.2014.17.4.413
Since the structural temperature of a flight vehicle flying at high speed rises rapidly due to aerodynamic heating, it is necessary for optimum structural design to obtain proper material properties at high temperature by taking into account of its operational environment. For a special alloy, analysis data on strength change due to exposure time to high temperature are very limited, and most of them are for an exposure time longer than 30 minutes for long term operations. In this study, base and weld metal samples of Ti-6Al-4V alloy had been prepared and high temperature tensile tests with induction heating were performed, and then high temperature strength characteristics and strength recovery characteristics through cooling have been analyzed. Pre-tests to determine maximum heating rate were performed, and response characteristics for temperature control were confirmed. As a result, high temperature tensile strength appeared to be lower than that of room temperature, but it was higher than that of high temperature of 30 minite exposure listed in MMPDS. In strength recovery through cooling Ti-6Al-4V alloy has shown higher recovery rate compared with other alloys.
Position Estimation of Underwater Target Using Proximity Sensor with Bearing Information
Choi, Young-Doo ; Kim, Jung-Hoon ; Yoon, Kyung-Sik ; Seo, Ik-Su ; Lee, Dong-Hun ; Lee, Kyun-Kyung ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 4, 2014, Pages 422~429
DOI : 10.9766/KIMST.2014.17.4.422
Proximity sensor networks are aimed at estimation kinematic state of target using estimated position of the target by each sensor node or target parameter. To analyze the kinematic state of target, traditional approaches require detections on multiple sensors, very large number of sensors to achieve acceptable performance. In this paper, we propose a novel method which can estimate predicted position of the underwater target using minimum proximity sensor with bearing information to this problem. The proposed algorithm was verified performance through simulation.
Airworthiness Case Study for the Tactical UAV's Flight Control System
Choi, Seung Kie ; Moon, Jung Ho ; Ko, Joon Soo ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 4, 2014, Pages 430~435
DOI : 10.9766/KIMST.2014.17.4.430
This paper presents the case study of the airworthiness certification for the flight control system of tactical UAV. Airworthiness regulations for flight characteristics and design and construction based on the STANAG 4671 are selected, and safety assessment is performed. Stall protection on wing level and turning flight criteria, and flap interconnection system failures were analyzed and applied to the flight control system design. The Hardware-in-the-loop simulation including math model, integrated system verification and validation test and failure mode and effects test were also performed and they are used to validate the means of compliance of the proposed airworthiness.
A Study on the Trend of an Avionics System Architecture Development for UAV
Kim, Sung Woo ; Sim, Jae Ick ; Lee, Wang Gug ; Lee, Woo Jin ; Won, Dae Yeon ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 4, 2014, Pages 436~447
DOI : 10.9766/KIMST.2014.17.4.436
The major elements of avionics system architecture are requirements, Real Time Operating System, message communication, memory, and data format etc. Herein describes a state-of-the-art development trend for the avionics system architecture, system requirements and data bus among the major elements of avionics system. While, domestic technology has been tried to Integrated Modular Avionics(IMA) system based on the Avionics Full Duplex Switched Ethernet(AFDX) technology during Light Attack Helicopter(LAH) project in Korea, but not yet proved as the product case in Full Scale Development Phase. The avionics system architecture considering the domestic inexperience of the IMA system architecture are suggested for the Next-generation Corps Unmanned Aircraft System.
The Development of Virtual Fire Control System Considering Operational Environment of Helicopter
Kim, Woosik ; Lee, Dongho ; Jang, Indong ; Park, Hanjoon ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 4, 2014, Pages 448~455
DOI : 10.9766/KIMST.2014.17.4.448
Virtual Fire Control System(VFCS) in attack helicopter is developed. VFCS is comprised of multifunction display, store management computer, mission computer, target acquisition and designation system, mission planning system, weapon simulator and flight simulator. Weapon engagement process under the operational environment of helicopter was considered by using the VFCS. We considered hellfire missile, tow missile, unguided rocket and turret gun. The results of this study will be utilized efficiently on integrated fire control system SIL(System Integration Lab.) in attack helicopter.
IR Characteristics of an Aircraft in Different Atmospheric/Background Conditions
Kim, Taehwan ; Song, Jiwoon ; Cha, Jong Hyun ; Bae, Ji-Yeul ; Jung, Daeyoon ; Cho, Hyung Hee ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 4, 2014, Pages 456~462
DOI : 10.9766/KIMST.2014.17.4.456
Infrared(IR) guided heat-seeking missiles uses IR emissions from aircraft to detect and track a target. Due to passive characteristic of the IR guidance, early detection of the missile is difficult and it is significant threat to aircraft survivability. Therefore, IR signature prediction of the aircraft is an important aspect of the stealth technology. In this study, we simulated IR signature of the aircraft in real atmospheric conditions. Aircraft surface temperature distribution was calculated by using RadthermIR code. Based on temperature distribution, IR radiance and BRDF(Bidirectional Reflectance Distribution Function) image were simulated for different weather(seasonal) and background(sky/soil) conditions. The IR contrast tendencies are not aligned with surface temperature or magnitude of target IR radiance. Therefore, it is essential to simulate IR signature with various conditions and background to acquire reliable database.
Variation of Supersonic Aircraft Skin Temperature under Different Mach number and Structure
Cha, Jong Hyun ; Kim, Taehwan ; Bae, Ji-Yeul ; Kim, Taeil ; Jung, Daeyoon ; Cho, Hyung Hee ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 4, 2014, Pages 463~470
DOI : 10.9766/KIMST.2014.17.4.463
Stealth technology of combat aircraft is most significant capability in recent air battlefield. As the detector of IR missiles is being developed, IR stealth capability which is evaluated by IR signature level become more important than it was in previous generation. Among IR signature of aircraft from various sources, aerodynamic heating dominates in long-wavelength IR spectrum of
. Skin temperature change by aerodynamic heating which is derived by effects of Mach number and structure. The 4th and 5th generation aircraft are selected for calculation of the skin temperature, and its height and velocity in numerical conditions are 10,000 m and Ma 0.9~1.9 respectively. Aircraft skin temperature is calculated by computing convection of fluid and conduction, convection and radiation of surface. As the aircraft accelerates to higher Mach number, maximum skin temperature increases more rapidly than average temperature and temperature distribution changes in more sharp, interactive ways. The 4th generation aircraft whose shape is more complex than that of the 5th generation aircraft have complicated temperature distribution. On the other hand, the 5th generation aircraft whose shape is relatively simple shows plain temperature distribution and lower skin temperature in terms of both average and maximum value.
A Study on the Case Study and Evaluation Methodology of Operational Availability for a Naval Ship using OT&E Data
Paik, Soonhuem ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 4, 2014, Pages 471~478
DOI : 10.9766/KIMST.2014.17.4.471
Navy forces of ROK asked for more than 90% operational availability in the requirement document of combat ship. This study proposes the evaluation methodology of operational availability with the evaluation process, calculation formula, analysis of operational test data. As the case study, the developed methodology is proved to apply for 00 batch-I naval ship using the data to be acquired during the operational test period. The operational availability by test data was 90.03%, and it was satisfied with objective value 90%. The paper will contribute not only to establish the evaluation methodology of operational availability for combat ship but also other general weapon system.
Measurement of the Impact Fuze Phenomena using the Underwater Explosion
Choi, SiHong ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 4, 2014, Pages 479~484
DOI : 10.9766/KIMST.2014.17.4.479
In this paper, This study shows the content on the impact fuze test and the measurement using underwater explosion phenomena. The impact fuze has both a delay function and a super quick. Up to now, nothing but the naked eye of the observer has been used to verify performance of the impact fuze. The observer has determined the performance by the shape of the plume created from the explosion phenomenon. However, it is extremely difficult to use that method at a long range. In order to solve the problem, the measurement using the underwater explosion phenomena was tried.
An Antenna & RF System for Fly-away Satcom Terminal Application on Ka-band
Park, Byungjun ; Kim, Chunwon ; Yoon, Wonsang ; Lee, SeongJae ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 4, 2014, Pages 485~491
DOI : 10.9766/KIMST.2014.17.4.485
An Antenna & RF system for a fly-away satcom terminal application on ka-band is presented in this paper. The Fly-away satellite terminal can be moved and operated by two person and adapt automatic satellite tracking system in order to decrease the tracking time. Additionally, for low-power consumption, compact size and light-weight, a dual reflector antenna is constructed using dual-offset gregorian antenna structure. For minimize weight, the reflector of the antenna is made of Magnesium. For low-power consumption and light-weight, the pHEMT MMIC compound devices is utilized. The Electronic Band-Gap(EBG) Low-Pass Filter(LPF) is designed for harmonic rejection. In the receiving part, Low-Noise Block converter(LNB) structure is designed for compact and lightweight. In this paper, fly-away satcom terminal with low-power consumption, compact size and light-weight is described with antenna system and RF system performances. Through the experimentation, fly-away terminal's EIRP is more than 50dBW, G/T is more than
A Study on the Factors to Activate the Defense Industry Export and Import Management System using Technology Acceptance Model
Kim, Tae-Yeon ; Gim, Gwang-Yong ; Joe, Sung-Keun ; Noh, Hyun-Il ; Choi, Kyung-Hwan ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 4, 2014, Pages 492~500
DOI : 10.9766/KIMST.2014.17.4.492
The defense industry export of Korea has been steadily risen since 2006. It is attained $340million, the highest export amounts ever, in 2013. As the defense industry export increase, Defense Acquisition Program Administration (DAPA) built defense industry export and import management system to assist export and to protect defense technologies. In this paper, we study factors to activate the defense industry export and import management system using Technology Acceptance Model(TAM) in compulsive usage environment. The significance of this study is as follows: First, we prove the reliability and feasibility of measurement variables in defense industry of compulsive usage environment. Second, we suggest factors to activate the defense industry export and import management system. Third, we present methodology to find factors in computation systems of public institute using TAM.
A P2P Based Tactical Information Sharing System for Mobile Nodes
Lee, Hyun ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 4, 2014, Pages 501~509
DOI : 10.9766/KIMST.2014.17.4.501
In NCW(Network Centric Warfare) environment, mobile nodes communicate through wireless link. But wireless link provides limited networking performance due to signal interferences or mobility of nodes. So it is quite challenge to acquire enough networking resources and use the resources efficiently. In this paper, we have proposed a P2P based tactical information sharing system which provides satisfactory visual information playout for mobile nodes(i.e., military personnel, vehicle,..) in NCW environment. Our proposed system consists of two components. One is caching-enabled switch which stores tactical information segments at its internal storage and then transports them to mobile nodes when require. Another is centralized scheduling algorithm which exploits networking resources more efficiently. To validate performance of proposed system, we performed series of experiments in wireless network testbed. Results show improved performance in terms of segment-missing ratio, networking resources usage, sharing time, and number of simultaneous playout mobile nodes with acceptable playout continuity(i.e., over 95%).
Review : Structures, Synthesis and Applications of MOF
Lee, Junwung ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 4, 2014, Pages 510~520
DOI : 10.9766/KIMST.2014.17.4.510
Metal-Organic Frameworks(MOFs) are attracting attentions from various fields including chemistry, materials science, physics and medical science because of its exceptionally large pore volumes and surface areas which far exceed those of zeolites. The possibilities of applications of MOFs for gas separation, catalysts, drug delivery, and high explosives detections have already been verified. In these review the author describes the structures, synthetic methods and applications of MOFs based on the literatures published during last 15 years to give the readers general pictures of MOF itself as well as the global research trends of these materials.
Measurement and Analysis for Radar Glint Effect of Maritime Target
Kim, Eunil ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 4, 2014, Pages 521~530
DOI : 10.9766/KIMST.2014.17.4.521
In this paper, the glint effect of maritime target to a radar system was analyzed by simulation and field test with a barge and corner reflectors. From the experiment, we proposed a glint measurement method of a real maritime target and it was indicated that the glint effect between the simulation results and real measurement is similar. Also it was founded that the glint effect is related to the relative amount of RCS(Radar Cross Section) difference among major scattering point and minor scattering points. Finally, the experiment showed the glint effects of the rotating barge with some different combinations of scattering points.
Stripping Method of Ring Laser Gyroscope Based on Measurement Model of Dither Motion
Kim, Cheon-Joong ; Shim, Kyu-Min ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 4, 2014, Pages 531~536
DOI : 10.9766/KIMST.2014.17.4.531
There are trapping and stripping methods as the technique to remove the dither motion from RLG(Ring Laser Gyro) output. V/F converter output of angular sensor to measure the dither motion is used in stripping method. But bias and scale factor error is always included in V/F converter output and is a critical limiting factor for the wide application of stripping method to RLG. Therefore there have been many researches to solve this problem. The method to accurately estimate the bias and scale factor error of V/F converter using measurements of the angular sensor acquired at data sampling rate of INS is presented in this paper. To this end, stripping technique based on model of dither motion is newly applied.
Performance Analysis in Disturbance on Initial Alignment of Laser Inertial Navigation System Using Unscented Kalman Filter
Oh, Juhyun ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 4, 2014, Pages 537~543
DOI : 10.9766/KIMST.2014.17.4.537
RLG(Ring Laser Gyroscope) is a main device of LINS(Laser Inertial Navigation System). RLG has the lock-in region in which there is no output signal. To alleviate the lock-in problem, a mechanical oscillation, the dither motion, is applied on RLG. A LPF(Low Pass Filter) is usually used on the output of RLG and accelerometer to remove the noise that is made by the dither motion. When the LINS is induced the disturbance during the initial alignment, it takes more time on alignment due to the use of the LPF and a fixed gain controller. In this paper, an initial alignment using UKF(Unscented Kalman Filter) is designed and analysed. Analysis include comparison between conventional initial alignment loop using fixed gain type controller and proposed initial alignment using UKF. Moreover, Disturbance inducing test results are demonstrated.
The Direction Finding Ambiguity Analysis for 3 Element and 4 Element Phase Interferometer DF System
Lee, Jung-Hoon ; Woo, Jong-Myung ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 4, 2014, Pages 544~550
DOI : 10.9766/KIMST.2014.17.4.544
In this paper, we have proposed a novel method which can analysis the direction finding ambiguity analysis for array geometry in 3 channel and 4 channel multiple baseline direction finding system. Generally, the direction finding ambiguity in the 3 element and 4 element phase interferometer direction finding system is calculated by the simulation for the array spacing or by the probability with the selected antenna array spacing. There are some restrictions to obtain the ambiguity of direction finding system in these methods. The former performs a simulation with every antenna array spacing and the latter calculates the ambiguity with the selected antenna array spacing. To overcome those restrictions, This paper proposed the novel method to calculate the ambiguity using the imaginary antenna array spacing and the phase difference prior to the modular operation in direction finder. Using the proposed method, we obtain the ambiguity probability for each of array geometry composed of multiple baseline. After performing the simulation with the selected antenna array spacing to verify the proposed method, we compared the calculated result data with the simulation data.
The Flow Field Structure of Jet-in-Cross Flow through the Perforated Damage Hole
Lee, Ki-Young ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 4, 2014, Pages 551~559
DOI : 10.9766/KIMST.2014.17.4.551
The influence of the battle damage hole on the velocity and vorticity flow field have been studied by using particle image velocimetry. Time averaged velocity and vorticity vector fields in the vicinity of jet are presented. The perforated damage hole on a wing created from a hit by anti-air artillery was modeled as a 10% chord size hole which positioned at quarter chord. At low angles of attack, the vorticity in the forward side of the jet is cancelled due to mixing with the wing surface boundary layer. Stretching of vorticity in the backside of the jet generates a semi-cylindrical vortical layer that enclosing a domain with slow moving reverse flow. Conversely, at higher the angles of attack, the jet vorticity advected away from the wing surface and remains mostly confined to the jet. The mean flow behind the jet has a wake-like structure.