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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
Selecting the target year
Performance Evaluation of a Bidirectional Piezoelectric Hybrid Actuator
Jin, Xiaolong ; Ha, Ngocsan ; Goo, Namseo ; Bae, Byungwoon ; Kim, Taeheun ; Ko, Hanseo ; Lee, Changseop ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 3, 2015, Pages 213~219
DOI : 10.9766/KIMST.2015.18.3.213
Piezoelectric-based hydraulic actuator is a hybrid device consisting of a hydraulic pump driven by piezoelectric stacks that is coupled to a conventional hydraulic cylinder via a set of fast-acting valves. Nowadays, such hybrid actuators are being researched and developed actively in many developed countries by requirement of high performance and compact flight system. In this research, a piezoelectric hybrid actuator has been designed and tested. To achieve bi-directional capabilities in the actuator, solenoid valves were used to control the direction of output fluid. The experimental testing of the actuator in uni-directional and bi-directional modes was performed to examine performance issues related to the solenoid valves. The results showed that the bi-directional performance was slightly lower than uni-directional performance due to air bubble developed in the valve system. A new design to solve the vacuum problem has been proposed to improve the performance of the hybrid actuator.
The Effect of Stationary Fin and Buoyancy Devices on Dynamic Pitching of the Tracked Vehicle
Park, KyungChul ; Kim, HyeongHyeon ; Kwon, JoonSik ; Kim, KyungRo ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 3, 2015, Pages 220~225
DOI : 10.9766/KIMST.2015.18.3.220
In this study, the effect of stationary fin and buoyancy devices on dynamic pithing of the tracked vehicle was investigated. For this work, the stationary fin and buoyancy devices were installed in front of body and then pitching variation was measured when rapidly reducing the vehicle speed in water operation. According to the results of measuring the freeboard at each case, when only fin was installed, the effect on freeboard of tracked vehicle in water was negligible. However, when buoyancy devices were installed, front freeboard was approximately increased by about 20~25 mm and rear freeboard was decreased by about 10~15 mm per each addition of 100 kg buoyancy device. Based on the calculation result of pitching decrease rates, it was found that the pitching variation was decreased approximately 12.3 % by fin installation and approximately 2 % by installation of each 100 kg of buoyancy device. The case in which only fin installation was made showed the best efficiency in decreasing pitching variation of the tracked vehicle in water compared to the other cases.
Vision-based Navigation for VTOL Unmanned Aerial Vehicle Landing
Lee, Sang-Hoon ; Song, Jin-Mo ; Bae, Jong-Sue ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 3, 2015, Pages 226~233
DOI : 10.9766/KIMST.2015.18.3.226
Pose estimation is an important operation for many vision tasks. This paper presents a method of estimating the camera pose, using a known landmark for the purpose of autonomous vertical takeoff and landing(VTOL) unmanned aerial vehicle(UAV) landing. The proposed method uses a distinctive methodology to solve the pose estimation problem. We propose to combine extrinsic parameters from known and unknown 3-D(three-dimensional) feature points, and inertial estimation of camera 6-DOF(Degree Of Freedom) into one linear inhomogeneous equation. This allows us to use singular value decomposition(SVD) to neatly solve the given optimization problem. We present experimental results that demonstrate the ability of the proposed method to estimate camera 6DOF with the ease of implementation.
Impact Point Prediction of the Ballistic Target Using a Flight Phase Discrimination
Jung, JaeKyung ; Hwang, DongHwan ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 3, 2015, Pages 234~243
DOI : 10.9766/KIMST.2015.18.3.234
It is required to have the capability to predict the impact point of the ballistic target in order to assign the firing unit with high engagement possibility for the interception in the ballistic target defense systems. In this paper, a novel method is proposed to predict the impact point of the ballistic target using a flight phase discrimination algorithm given the insufficient measurements on the partial trajectory. The flight of a ballistic target is composed of a boost phase and a ballistic phase with different dynamics. The flight phase is discriminated by using the normalized innovation distance between measurements and a priori estimated measurements. The threshold and tolerance in the flight phase discrimination are determined from the probabilistic characteristics of the estimation error. Monte Carlo simulations are performed to verify the proposed method.
A Study on the Measurement System Design for Measuring Properties of AC Magnetic Field Sensor
Chung, Hyun-Ju ; Yang, Chang-Seob ; Jung, Woo-Jin ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 3, 2015, Pages 244~252
DOI : 10.9766/KIMST.2015.18.3.244
This paper describes design and construction results of the measurement system developed on the purpose of measuring properties of AC magnetic field sensors used in the weapon system. The system for measuring the properties of AC magnetic field sensors consist of 3-axis helmholtz coil, signal generator, signal amplifier, sensor data acquisition unit and AC magnetic field sensor property measurement & analysis equipment including the operating software. By using this system, we can measure various properties of AC magnetic field sensor such as sensitivity, linearity and dynamic response in the frequency from 1 Hz to 10 kHz. Finally we also verified its performance by measuring the property of a MAG 639, standard magnetic field sensor of bartington instruments, with the developed measurement system.
A Study on Signal Processing of Target Discrimination Using RELAX in Millimeter-wave Seeker
Jo, Heejin ; Kim, Minwoo ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 3, 2015, Pages 253~259
DOI : 10.9766/KIMST.2015.18.3.253
This paper introduces a signal processing technique for discrimination of missile target. In order to detect and discriminate the target, a seeker radar makes use of chirp waveform and stretch processing to generate high resolution range profiles(HRRPs). RELAX(relaxation) algorithm, which is one of the spectral estimation techniques, was used to find scattering centers of a missile from HRRP. From the information on the distribution of one-dimensional(1-D) scattering centers on a target, we can discriminate the target without noise.
Optimal Interface Design between Short-Range Air Defense Missile System and Dissimilar Combat Systems
Park, Hyeon-Woo ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 3, 2015, Pages 260~266
DOI : 10.9766/KIMST.2015.18.3.260
The warship is run based on the combat system which shares tactical information collected by target detection systems and navigation devices across a network, and conducts the command and control of weapons from target detection to kill assessment. The short-range air defense missile system defends a warship from anti-ship missiles, aircraft, helicopter and other threats in order to contribute to the survival of a warship and the success of missions. The short-range air defense missile system is applied to a various combat systems. In this paper, we have proposed the interface design between the short-range air defense missile and dissimilar combat systems. To employ the short-range air defense missile at dissimilar combat systems, each system is driven by independent processor, and the tasks which are performed by each system are assigned. The information created by them is exchanged through the interface, and the flow of messages is designed.
Storage Life Estimation of Magnesium Flare Material for 81 mm Illuminating Projectile
Back, Seungjun ; Son, Youngkap ; Lim, Sunghwan ; Myung, Inho ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 3, 2015, Pages 267~274
DOI : 10.9766/KIMST.2015.18.3.267
It is necessary to both analyze root-cause of non-conformance of effective illumination time to the specification, and estimate the storage lifetime for 81 mm illuminating projectile stockpiled over 10 years. In this paper, aging mechanism of magnesium flare material due to long-term storage was supposed, and two-stage tests, pre-test and main test based on accelerated degradation tests were performed. Field storage environment of moistureproof was set up, and illumination times in the accelerated degradation tests for temperatures 60 and
were measured. Then, storage reliability of the projectile was estimated through analyzing the measured data and applying distribution-based degradation models to the data. The
life by which 10 % of a population of the projectiles will have failed at storage temperature of
was estimated about 7 years.
A Telemetry System for Ammunition
Han, Dong phil ; Kim, Young won ; Oh, Jong soo ; Kim, Wan Joo ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 3, 2015, Pages 275~282
DOI : 10.9766/KIMST.2015.18.3.275
Recently, telemetry systems are used to test and evaluate of ammunition. When a transmitting signal from a small transmitter mounted inside the ammunition is sent out, the receiving equipments get real-time RF data. This paper relates to the development of a small high-G endurable transmitter and a portable receiving equipment. The system was tested and confirmed 00 km communication range.
Automatic Safety Inspection Technique for Ammunition Fuzes using Radiographic Images
An, Ji Yeon ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 3, 2015, Pages 283~292
DOI : 10.9766/KIMST.2015.18.3.283
This paper presents the development of the automatic safety inspection technique for the ammunition fuzes using radiography images. The technique inspects 49-ammunition fuze by detecting the X-ray or neutron radiographic images to check whether the fuze is unintendedly armed or/and some major assembled parts are at right place. To execute the program, we loads the image(s) for under test. After reading images, the program conducts a series of pre-image processing, and then starts inspecting input images by using the detection algorithms which are designed distinctively for each fuze. After completing the detection process, the program displays the final result of the fuze status: "safety or danger." Through this program, we can cut off the fuzes which have any doubt about safety, and can only provide absolutely safe fuzes, compared with the current naked eye inspection method.
Damage Effect on Glass Fibre Reinforced Plastics under Airflow by a Continuous Wave Laser
Lee, Kwang Hyun ; Shin, Wan-Soon ; Kang, Eung-Cheol ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 3, 2015, Pages 293~299
DOI : 10.9766/KIMST.2015.18.3.293
We analyzed the damage effect on Glass Fibre Reinforced Plastics(GFRP) under air flow by irradiation of continuous wave near-IR laser. Damage process and temporal temperature distribution were demonstrated and material characteristics were observed with laser intensity, surface flow speed and angle. Surface temperature on GFRP rapidly increased with laser intensity, and the damaged pattern was different with flow characteristics. In case of no flow, penetration on GFRP by burning and flame generation after laser irradiation was appeared at once. GFRP was penetrated by the heat generated from resin ignition. In case of laser irradiation under flow, a flame generated after burning extinguished at once by flow and penetration pattern on GFRP were differently shown with flow angle. From the results, we presented the damage process and its mechanism.
Experimental Study on Artificial Supercavitation of the High Speed Torpedo
Ahn, Byoung-Kwon ; Jung, So-Won ; Kim, Ji-Hye ; Jung, Young-Rae ; Kim, Sun-Bum ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 3, 2015, Pages 300~308
DOI : 10.9766/KIMST.2015.18.3.300
Recently supercavitating underwater torpedo moving at high speed (over 200 knots) has been interested for their practical advantage of the dramatic drag reduction. Cavitator located in front of the torpedo plays an important role to generate a natural supercavity and control the motion of the object. Supercavity can be created artificially by injection of compressed gas from the rear of the cavitator at a relatively low speed. In this paper, we investigated physical characteristics of artificial supercavities through cavitation tunnel experiments. One of the main focuses of the study was to measure pressure inside the cavity, and examined variation of the gravity effects appearing according to different amount of injected air. It was also found that a stable supercavity could be sustained at injection rates less than that required to form the stable supercavity because of hysteresis effect.
Lower-limb Exoskeleton Testbed for Level Walking with Backpack Load
Seo, Changhoon ; Kim, Hong-chul ; Wang, Ji-Hyeun ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 3, 2015, Pages 309~315
DOI : 10.9766/KIMST.2015.18.3.309
This paper presents a lower-limb exoskeleton testbed and its control method. An exoskeleton is a wearable robotic system that can enhance wearer`s muscle power or assist human`s movements. Among a variety of its applications, especially for military purpose, a wearable robot can be very useful for carrying heavy loads during locomotion by augmenting soldiers` mobility and endurance. The locomotion test on a treadmill was performed up to maximum 4km/h walking speed wearing the lower-limb exoskeleton testbed with a 45kg backpack load.
Assessment Process and Methods of Launcher Vehicle Exterior Designs
Kim, Sarah ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 3, 2015, Pages 316~325
DOI : 10.9766/KIMST.2015.18.3.316
This paper describes the design guide and its assessment process to be applied to the launcher vehicle exterior design. A launcher vehicle design is required to meet three kinds of design attributes; symbolic quality, usability, and aesthetic quality. The launcher vehicles referred to in this paper are assessed by the elements in the guidelines. A set of assessment process and methods is derived to evaluate how well the three design attributes are applied in the actual launch vehicle design. An example of assessment is shown at the last part of this paper. By this way designers can take various criteria into account integratively and select the final design. High design satisfaction and pride of the operators and the nation can be assured in the end.
V&V of Integrated Interoperability System for LVC Simulation on Aircraft Weapon System
Oh, Jihyun ; Jang, Young Chan ; Kim, Cheon Young ; Jee, Cheol Kyu ; Hong, Young Seok ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 3, 2015, Pages 326~334
DOI : 10.9766/KIMST.2015.18.3.326
This paper describes the verification and the validation about the development of the integrated interoperability system for live, virtual, and constructive simulations on the aircraft weapon system. The proposed integrated interoperability system provides the framework and application softwares for implementing a synthetic environment emulating real-world environment among distributed simulation models, which are a mission model and an air combat model of a constructive level, an tactical simulator of a virtual level, and simulated ACMI of a live level. In this paper, we verify requested functions through an developmental test and evaluation, and validate operability and usability through conducing integrated LVC scenarios on the integrated interoperability system.
Composition and Use of Biosafety Level 3 Facility
Kim, Changhwan ; Hur, Gyeunghaeng ; Lee, Wangeol ; Jung, Seongtae ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 3, 2015, Pages 335~342
DOI : 10.9766/KIMST.2015.18.3.335
Laboratory facilities for biology are designed as biosafety level 1, biosafety level 2, biosafety level 3, and biosafety level 4. Biosafety level designations are based on a composite of the design features, construction, containment facilities, equipment, practice and operation procedures required for working with agents from the various risk groups. Generally, biosafety level 3 means the facility that is appropriate for the experiments using pathogens which can cause serious diseases by aerosol transmission. The biosafety level assigned for the specific work to be done is driven by professional judgement based on a risk assessment, rather than by automatic assignment according to the particular risk group designation of the pathogenic agents to be used. In this paper, we introduced the biosafety level 3 facility operated in ADD(Agency for defense development). It contains the overview of facility, microbiological experiment, animal experiment, decontamination and waste disposal. Biosafety level 3 laboratory in ADD has served the vital role in the research of biological agents and antidote development.