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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
Design and Evaluation of Opening Devices of Separable Nose Cap
Kang, ChoonGil ; Lee, DongMin ; Park, GeunSoo ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 2, 2015, Pages 101~108
DOI : 10.9766/KIMST.2015.18.2.101
In this paper, we have proposed a separable nose cap and its opening device to protect a seeker's window from aerodynamic heating and to decrease the drag force on missile body. The nose cap should be promptly deployed to secure the view field of seeker when it is needed. This cap consists of two nose cap structures and separation devices such as pyro puller and pusher. The performance of pyro puller was fully verified through analyses and several kinds of operating tests. We can obtain a sufficient confidence level of the pyro puller through many operating tests under various environments.
Compensation Method of Gyro Bias Hysteresis Error using the Rate of Temperature
Yu, Haesung ; Kim, Cheon Joong ; Sung, Changgi ; Lee, Inseop ; Park, SangEun ; Park, Heung-won ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 2, 2015, Pages 109~114
DOI : 10.9766/KIMST.2015.18.2.109
A method to compensate a bias hysteresis error of the ring laser gyro using the rate of temperature is proposed in this paper. Until now, we generally have measured and compensated the error of gyro and accelerometer using the temperature. However, we utilize the measured values of the temperature dependent error elements on the temperature rate in navigation system level. We show through experiments that the proposed method can improve the navigation performance and be very effective.
Experimental Study on Estimation of Flight Trajectory Using Ground Reflection and Comparison of Spectrogram and Cepstrogram Methods
Jung, Ookjin ; Go, Yeong-Ju ; Lee, Jaehyung ; Choi, Jong-Soo ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 2, 2015, Pages 115~124
DOI : 10.9766/KIMST.2015.18.2.115
A methodology is proposed to estimate a trajectory of a flying target and its velocity using the time and frequency analysis of the acoustic signal. The measurement of sound emitted from a flying acoustic source with a microphone above a ground shall receive both direct and ground-reflected sound waves. For certain frequency contents, the destructive interference happens in received signal waveform reflected path lengths are in multiple integers of direct path length. This phenomenon is referred to as the acoustical mirror effect and it can be observed in a spectrogram plot. The spectrogram of acoustic measurement for a flying vehicle measurement shows several orders of destructive interference curves. The first or second order of curve is used to find the best approximate path by using nonlinear least-square method. Simulated acoustic signal is generated for the condition of known geometric of a sensor and a source in flight. The estimation based on cepstrogram analysis provides more accurate estimate than spectrogram.
A Study for Prediction of Water Contents in Soil by Using the Soil Thermal Conductivity
Cho, Jin-Woo ; Kang, Do-Kyung ; Kang, E-Sok ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 2, 2015, Pages 125~130
DOI : 10.9766/KIMST.2015.18.2.125
Vehicles and UGV(Unmanned Ground Vehicle) need a variety of road informations, such as road profile, soil type and soil water contents, to run a cross country course. Especially, soil water contents are very important factor to judge the vehicle mobility, because it can change soil strength. This paper describes the real-time measuring method of soil water contents by using the soil thermal conductivity.
Design and Synthesis of Novel Energetic Oxirane Monomers Containing a Molecular Explosive Moiety
Shen, Yechen ; Kwon, Younghwan ; Kim, Jin Seuk ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 2, 2015, Pages 131~138
DOI : 10.9766/KIMST.2015.18.2.131
Energetic monomers with new design concept were synthesized for energetic prepolymers. Novel energetic monomers consisted of ring-opening polymerizable oxirane and a molecular explosive moiety instead of small explosophores as energetic functional groups. According to the design concept, glycidyl dinitroazetidine (GDNAZ) and glycidyl nitroazetidinol(GNAZO) energetic monomers were synthesized, respectively, and characterized by NMR, EA and GC MS. Heat of formation and detonation performance were calculated by theoretical method to evaluate energy performance of these novel energetic monomers. The result revealed that GDANZ and GNAZO possessed high potential as new energetic monomers for synthesizing energetic prepolymers and binders in PBXs.
Flexible Piezoelectric Nanocomposite Generator Devices based on BaTiO
Bae, Soo Bin ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 2, 2015, Pages 139~145
DOI : 10.9766/KIMST.2015.18.2.139
In this paper, the flexible piezoelectric nanocomposite generator(NCG) device based on
nanostructures was fabricated via simple and low-cost spin coating method. The
nanostructures synthesized by self-assembly reaction showed dendrite morphologies. To produce the piezoelectric nanocomposite(p-NC layer) which acts as an electric energy source in NCG device, the piezoelectric nanopowders(
) were dispersed in polydimethylsiloxane(PDMS). Sequently, the p-NC layer was inserted in two dielectric layer of PDMS; these layers enabled the NCG device flexibility as well as durability prohibiting detachment(exfoliation) for significantly mechanical bending motions. The fabricated NCG device shows average maximum open circuit voltage of 6.2 V and average maximum current signals of 300 nA at 20 wt% composition of
nanostructures in p-NC layer. Finally, the flexible energy harvester generates stable output signals at any rate of frequency which were used to operate LCD device without any external energy supply.
Prediction and Verification of Water-entry Traces Size of Small Falling Objects into the Sea
Min, Anki ; Hwang, Tae-Won ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 2, 2015, Pages 146~153
DOI : 10.9766/KIMST.2015.18.2.146
An unmanned aerial photography method by using an unmanned helicopter is useful method for measuring of the water-entry traces of small falling objects into the sea. Pixel sizes on the aerial photograph may be too large due to a limit of camcorder resolution and a wide shooting area. If the pixel size is too large, identification of water-entry trace is impossible. Thus an accurate prediction of water-entry trace size is required. The traces of water-entry could be classified into three types such as splash, water column, and bubble. Diameters of each trace are predicted by water-entry impact pressure theories, cavity theories, and trial test results. The results are verified by drop tests using an unmanned helicopter at two water-entry speeds. As a result, prediction and test results showed sufficient similarity to evaluate the identifiability of water-entry trace.
Concrete Target Size Effect on Projectile Penetration
Kim, Seokbong ; Yoo, Yohan ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 2, 2015, Pages 154~159
DOI : 10.9766/KIMST.2015.18.2.154
This paper deals with the effect of concrete target size on penetration of projectiles. We investigated the penetration depth and residual velocity of projectiles using the 2-D axial symmetric model. Most analysis were conducted with 13 kg projectile (striking velocity: 456.4 m/s) and concrete target with compressive strength of 39 MPa. This paper provided penetration depth (or residual velocity) versus ratio D/d (target diameter, D and projectile diameter, d). When the bottom of concrete cylinder was constrained, penetration depth converged to limit depth more than the ratio D/d of 36. The residual velocity of projectile with thin concrete target were investigated. The residual velocity was converged to specific velocity more than the ratio D/d of 16.
The Hydrogen Production from the Hydrolysis of Mg-Graphite Pellet for Military Fuel Cells
Park, Minsun ; Yu, Minkyu ; Kim, Jongsoo ; Kwon, Hyuksang ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 2, 2015, Pages 160~166
DOI : 10.9766/KIMST.2015.18.2.160
On board hydrogen generation from the hydrolysis of an active metal is very attractive due to its economical, convenient, and safe reasons. A Mg-graphite pellet has been designed as a hydrogen source for portable fuel cell. Mg (1 g) + 0.10 g graphite pellet showed an excellent hydrogen generation rate that is equivalent to 15.8 ml/g.min from its hydrolysis. The hydrogen generation rate of the pellet is significantly increased due to the galvanic corrosion by galvanic cells between Mg anode and graphite cathode in a 10.wt. % NaCl solution at a room temperature.
A Study on LEE Model Application for Propagation Loss Estimation of UHF band in Mountain Area
Lee, Changwon ; Jeon, Yongchan ; Shin, Imseob ; Kim, Jin-Goog ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 2, 2015, Pages 167~172
DOI : 10.9766/KIMST.2015.18.2.167
In this paper, we have compared some radio propagation models in order to verify the performance of W.C.Y LEE propagation model in mountain area. The four propagation models, which are Okumura-Hata, ITU-R P.525, Egli and W.C.Y. LEE, are analyzed by comparing the differences between measured values and propagation loss estimation values. And a correction method for W.C.Y LEE model is suggested to improve the performance of W.C.Y. LEE model with measured data in mountain area. Simulation results show that the estimation error using W.C.Y LEE model is the lowest among four propagation models. Also, the results show that the corrected W.C.Y LEE model with suggested method improves the performance of propagation loss estimation.
Analysis of Flight Trajectory Characteristics of the MRBM by Adjusting the Angle of a Flight Path
Kim, Jiwon ; Kwon, Yong Soo ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 2, 2015, Pages 173~180
DOI : 10.9766/KIMST.2015.18.2.173
North Korea has developed ballistic missiles over the past 30 years. It is believed that they have a variety of ballistic missiles more than 1,000. Because these ballistic missiles threaten South Korea directly, accurate analysis of them is essential. Flight trajectories of the ballistic missiles are generally changed by means of adjusting payload weight, Isp, flight path angle, and cut-off time. The flight path angle is widely used to control the missile range. However it is difficult to predict the missile trajectory exactly in real operational environment because the missile could be launched according to its intention and purpose. This work analyzed the 1,000 km range MRBM's trajectory characteristics from adjusting flight path angle which is depressed as well as lofted method. The analysis of missile trajectory characteristics is based on the simulation of the missile trajectory model developed by KNDU research team.
Design the Guidance and Control for Precision Guidance Munitions using Reference Trajectory
Sung, Jae min ; Han, Eu Jene ; Song, Min Sup ; Kim, Byoung Soo ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 2, 2015, Pages 181~188
DOI : 10.9766/KIMST.2015.18.2.181
This paper present, the result of the guidance and control law for a course correction munitions(CCM) with 2sets of canards positioned in the rotating nose section. The nonlinear simulation model of the CCM was developed based on 7DOF equation of motion. The ability of correcting position was verified by open-loop control input with nonlinear model. The guidance and control command was constructed by reference trajectory which can be obtained with no control. Finally, the performance of the guidance and control law was evaluated through Monte-carlo simulation. The CEP(Circular Error Probability) was obtained by considering the errors in muzzle velocity, aerodynamic coefficient, wind, elevation and azimuth angle and density.
Applications and Key Technologies of Biomimetic Underwater Robot for Naval Operations
Lee, Ki-Young ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 2, 2015, Pages 189~200
DOI : 10.9766/KIMST.2015.18.2.189
This paper gives an overview on the some potential applications and key technologies of biomimetic underwater robot for naval operations. Unlike most manned underwater naval systems, biomimetic underwater robots can be especially useful in near-land or harbour areas due to their ability to operate in shallow water effectively. Biomimetic underwater robot provide advantages in reaching locations that would be difficult or too dangerous for a manned vehicle to reach, as well as providing a level of autonomy that can remove the requirement for dedicated human operator support. Using multiple or schools of underwater robots would provide increased flexibility for navigation, communication and surveillance ability. And it alleviate some of the restrictions associated with speed and endurance design constraints.
Temporal and Spatial Variability of Sound Propagation Characteristics in the Northern East China Sea
Park, Kyeongju ; Chu, Peter Cheng ;
Journal of the Korea Institute of Military Science and Technology, volume 18, issue 2, 2015, Pages 201~211
DOI : 10.9766/KIMST.2015.18.2.201
Acoustic propagation in shallow water with changing environments is a major concern of navy. Temporal and spatial variability of acoustic propagation in the northern East China Sea (ECS) is studied, using the 11 years hydrographic data and the Bellhop acoustic model. Acoustic propagation in the northern ECS is highly variable due to extensive interaction of various ocean currents and boundaries. Seasonal variations of transmission loss (TL) with various source depths are highly affected by sharp gradient of sound speed and bottoms interaction. Especially, various bottom sediment types lead to severely degrading a waterborne propagation with bottom loss. In particular, the highly increased TL near the ocean front depends on the source position, and the direction of sound propagation.