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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 15, Issue 6 - Dec 2012
Volume 15, Issue 5 - Oct 2012
Volume 15, Issue 4 - Aug 2012
Volume 15, Issue 3 - Jun 2012
Volume 15, Issue 2 - Apr 2012
Volume 15, Issue 1 - Feb 2012
Selecting the target year
Improvements in Design and Evaluation of Built-In-Test System
Heo, Wan-Ok ; Park, Eun-Shim ; Yoon, Jung-Hwan ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 2, 2012, Pages 111~120
DOI : 10.9766/KIMST.2012.15.2.111
Built-In-Test is a design feature in more and more advanced weapon system. During development test and evaluation(DT&E) it is critical that the BIT system be evaluated. The BIT system is an integral part of the weapon system and subsystem. Built-In-Test assists in conducting on system and subsystem failure detection and isolation to the Line Replaceable Unit(LRU). This capability reduces the need for highly skilled personnel and special test equipment at organizational level, and reduces maintenance down-time of system by shortening Total Corrective Maintenance Time. During DT&E of weapon system the objective of BIT system evaluation is to determine BIT capabilities achieved and to identify deficiencies in the BIT system. As a result corrective actions are implemented while the system is still in development. Through the use of the reiterative BIT evaluation the BIT system design was corrected, improved, or updated, as the BIT system matured.
Study on Floating to Surface for the Exercise Vehicle with Negative Buoyancy
Jung, Chan-Hee ; Choi, Jang-Seob ; Kim, Ki-Un ; Kang, Myung-Koo ; Lee, Jeong-Jun ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 2, 2012, Pages 121~129
DOI : 10.9766/KIMST.2012.15.2.121
In this study, in terms of the exercise vehicles of the weapon systems having negative buoyancy, the analysis on the operation concepts was performed and the new methods of floating to surface were proposed. In case of having negative buoyancy, the additional methods for recovering the exercise vehicle have to be considered. As parts of recovering the exercise vehicle, for floating to surface the new methods of weight discharge, weight separation and sea water discharge were proposed. The conceptual design about sea water discharge method was performed. It was confirmed that those methods could be applied to the design of the exercise vehicle having negative buoyancy.
Analysis of Gas Cooling System for IR Window
Hyun, Cheol-Bong ; Goo, Nam-Seo ; Kim, Jae-Young ; Lee, Ho-Sung ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 2, 2012, Pages 130~137
DOI : 10.9766/KIMST.2012.15.2.130
In this paper, a post-analysis of cooling system for infrared(IR) window was performed based on heating experiment of IR window system. We applied the same experimental conditions to analysis, and then validated the analysis technique by comparing numerical and experimental results. For an analysis software, we used a professional heat/fluid analysis program and the numerical and experimental results were in fairly good agreement. We investigated the effect of thermal transfer between the frame and IR window and also a cooling efficiency between fluid and structure in order to determine the proper parameters for the analysis. In this study, 100 % thermal transfer between the frame and IR window and 30 % cooling efficiency between fluid and structure have been proposed, which can be used in the future conceptual design and analysis of similar IR windows.
A Study on Anti-Submarine Surveillance Systems using Submarine's Turbulent Wake
Lee, Yong-Chol ; Lim, Se-Han ; Park, Jong-Jin ; Jin, Jong-Han ; Knag, Woong ; Lee, Mon-Jin ; Kim, Yun-Bae ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 2, 2012, Pages 138~146
DOI : 10.9766/KIMST.2012.15.2.138
Using Shear-free Ship wake theory it was predicted the detectable submarine's turbulent wake on the sea surface was about 12km long when there was no breaking waves on the sea surface. It means that there are sufficient detectable turbulent kinetic energies on the sea surface as well as in the water. In this paper, we have proposed some concepts of non acoustic anti-submarine surveillance systems; SAR for sea surface surveillance, LIDAR for sub-surface surveillance and propelled gliders for under -water surveillance.
Improving the Distributed Data Fusion Ability of the JDL Data Fusion Model
Park, Gyu-Dong ; Byun, Young-Tae ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 2, 2012, Pages 147~154
DOI : 10.9766/KIMST.2012.15.2.147
In this paper, we revise the JDL data fusion model to have an ability of distributed data fusion(DDF). Data fusion is a function that produces valuable information using data from multiple sources. After the network centric warfare concept was introduced, the data fusion was required to be expanded to DDF. We identify the data transfer and control between nodes is the core function of DDF. The previous data fusion models can not be used for DDF because they don't include that function. Therefore, we revise the previous JDL data fusion model by adding the core function of DDF and propose this new model as a model for DDF. We show that our model is adequate and useful for DDF by using several examples.
Target Positioning in Remote Area Using Strip Sensor Modeling of SPOT Imagery
Kim, Man-Jo ; Hwang, Chi-Jung ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 2, 2012, Pages 155~160
DOI : 10.9766/KIMST.2012.15.2.155
In this paper, a strip modeling method is developed for the acquisition of target positions in remote area and validated using the imagery of SPOT satellite. This method utilizes the parameters given in header files and constructs a camera model without ground control points. In most cases, the root mean squared error of check points is less than pixel size with one ground control point. The model error of reference image is evaluated using ground control points and used to remove the model error of target images acquired along the same satellite orbit, which enables one to calculate target positions in remote area where no ground control points are available.
An Experimental Study on Millimeter Wave Band Radome for ELINT Directional Finding System
Kim, Tae-Hyun ; Park, Boem-Jun ; Lee, Jung-Hoon ; Lee, Byung-Nam ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 2, 2012, Pages 161~168
DOI : 10.9766/KIMST.2012.15.2.161
In this paper, we have experimentally studied on phase characteristics of airborne radome for ELINT directional finding system, because it is difficult to find theoretical solutions for phase error of the radome. Especially, we described the millimeter wave band radome that was fabricated with cyanate-ester material and its thickness was 2mm. We presented the phase error about millimeter band radome. That phase error is about 30 degrees for parallel and perpendicular polarization in the K-Ka band. That is reasonable value for the ELINT directional finding system.
A Vision-based Position Estimation Method Using a Horizon
Shin, Jong-Jin ; Nam, Hwa-Jin ; Kim, Byung-Ju ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 2, 2012, Pages 169~176
DOI : 10.9766/KIMST.2012.15.2.169
GPS(Global Positioning System) is widely used for the position estimation of an aerial vehicle. However, GPS may not be available due to hostile jamming or strategic reasons. A vision-based position estimation method can be effective if GPS does not work properly. In mountainous areas without any man-made landmark, a horizon is a good feature for estimating the position of an aerial vehicle. In this paper, we present a new method to estimate the position of the aerial vehicle equipped with a forward-looking infrared camera. It is assumed that INS(Inertial Navigation System) provides the attitudes of an aerial vehicle and a camera. The horizon extracted from an infrared image is compared with horizon models generated from DEM(Digital Elevation Map). Because of a narrow field of view of the camera, two images with a different camera view are utilized to estimate a position. The algorithm is tested using real infrared images acquired on the ground. The experimental results show that the method can be used for estimating the position of an aerial vehicle.
A Study on Underwater Electro-magnetic Signature Prediction Due to Hull Corrosion of a Naval Ship
Chung, Hyun-Ju ; Yang, Chang-Seob ; Ju, Hae-Sun ; Jeon, Jae-Jin ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 2, 2012, Pages 177~185
DOI : 10.9766/KIMST.2012.15.2.177
Corrosion currents flow through the seawater due to the different electrochemical potential between a hull and a propeller under the draft line of ship. Additionally, in order to protect the hull and other sensitive anodic parts of the ship from corrosion, the corrosion protection system, called impressed current cathodic protection(ICCP) equipment has been installed in most naval ships. Those currents could be harmful to the electromagnetic silencing of the naval ship because sea mines are triggered by even a feeble field value. In this paper, we described electric and corrosion related magnetic fields by ship's galvanic corrosion and a corrosion protection system, and prediction results of electric and corrosion related magnetic fields at any depth for the model ship.
Risk Analysis of Hearing Loss in the Air Base
Kim, Sun-Kyung ; Lee, Seung-Hyun ; Kim, Dong-Soo ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 2, 2012, Pages 186~192
DOI : 10.9766/KIMST.2012.15.2.186
Noise is a major cause of hearing loss in the air base. There are lots of risk factors of hearing loss including noise, and hearing loss can be accelerated by combined effects of these risk factors. Here in, we reviewed risk factors of hearing loss, and analysed key risk factors inducing hearing loss in the air base. Risk factors exacerbating hearing loss with noise were mainly investigated in this research because noise could not be an avoidable risk factor in the air base. Analysed data will contribute to make green environment minimizing hearing loss of pilots and supporting personnels in the air base.
A Study on the Design Concept for NBC Clothing
Kang, Jae-Sung ; Seo, Hyeon-Kwan ; Park, Hyen-Bae ; Ryu, Sam-Gon ; Park, Sang-Hoon ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 2, 2012, Pages 193~200
DOI : 10.9766/KIMST.2012.15.2.193
The selection factors of the protective clothing against the NBC agents are the protection(chemical, biological, TIMs), duration, weight/comfort, dexterity/mobility, size, visibility, cleaning and unit cost, etc. To develop the NBC protective clothing, we should need to review about the design concepts of the protective materials(shell and liner fabric) and form. This paper identify an important factors for the protective materials and form, and presents design strategies for important factors based on the evaluation results of the materials and the form.
Characteristics of Damage on Photosensor Irradiated by Intense Illumination : Thermal Diffusion Model
Kwon, Chan-Ho ; Shin, Myeong-Suk ; Hwang, Hyon-Seok ; Kim, Hong-Lae ; Kim, Seong-Shik ; Park, Min-Kyu ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 2, 2012, Pages 201~207
DOI : 10.9766/KIMST.2012.15.2.201
Pulsed lasers at the 613 nm and 1064 nm wavelengths on nanoseconds have been utilized to characterize the damage on Si photodiode exposed to intense illumination. Morphological damages and structural changes at sites on the photodiode irradiated during microseconds of laser pulses were analyzed by FE-SEM images and XRD patterns, respectively. The removal of oxide coating, ripple, melting marks, ridges, and crater on photodiodes were definitely observed in order of increasing the pulse intensities generated above the damage threshold. Then, the degradation in photosensitivity of the Si photodiode irradiated by high power density pulses was measured as a function of laser irradiation time at the various wavelengths. The free charge carrier and thermal diffusion mechanisms could have been invoked to characterize the damage. The relative photosensitivity data calculated using the thermal diffusion model proposed in this paper have been compared with the experimental data irradiated above the damage threshold.
Experimental Study on Surface Temperature Variation Characteristics of Rectangular Parallelepipeds Constructed by Different Materials for Varying Meteorological Conditions
Kim, Dong-Geon ; Choi, Jun-Hyuk ; Kil, Tae-Jun ; Kim, Jung-Ho ; Kim, Tae-Kuk ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 2, 2012, Pages 208~214
DOI : 10.9766/KIMST.2012.15.2.208
The spectral radiance received by a remote sensor is consisted of the self-emitted component directly from the target surface, the reflected component of the solar irradiance at the target surface, and the scattered component by the atmosphere without ever reaching the object surface. In general, the self-emitted component is the most important part in the infrared signatures from the target. We measured the solar irradiation, sky irradiation, air temperature, wind velocity, wind direction, relative humidity, and atmospheric pressure together with the surface temperatures of rectangular parallelepiped targets. The measured diurnal surface temperature variations on the three different rectangular parallelepiped targets constructed by the steel, aluminum and bakelite are obtained at the same time intervals. The measured surface temperature results show that the top surface temperature of bakelite recorded up tp
higher than that of aluminium and
higher than that of steel at 11 AM on the sunny condition. A complete set of measured data including the surface temperature of rectangular parallelepiped targets together with the detailed weather information can be a valuable reference for future study.
Storage Life Evaluation of a Violet Smoke Hand Grenade(KM18) using Degradation Data
Chang, Il-Ho ; Hong, Suk-Hwan ; Jang, Hyun-Jeung ; Son, Young-Kap ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 2, 2012, Pages 215~223
DOI : 10.9766/KIMST.2012.15.2.215
A violet smoke hand grenade(KM18) is used to generate signals. The grenade is considered to fail when its smoke emission time is longer than the specified one so that its smoke concentration becomes lighter. Accelerated degradation test for the grenade was performed, and then failure in smoke emission time was reproduced from the test. Stress for the degradation test was selected as temperature/humidity from the pre-test results. Degraded data of emission time from the accelerated test were analyzed through applying a distibution-based degradation model. Then, Peck Model was applied to predict the storage life under field conditions. In addition, the predicted storage life was compared with that of ASRP(Ammunition Stockpile Reliability Program).
Effect of Conductive Additives on
Choi, Yu-Song ; Cheong, Hae-Won ; Kim, Ki-Youl ; Cho, Sung-Baek ;
Journal of the Korea Institute of Military Science and Technology, volume 15, issue 2, 2012, Pages 224~230
DOI : 10.9766/KIMST.2012.15.2.224
Thermal batteries have excellent mechanical robustness, reliability, and long shelf life. Due to these characteristics as well as their unique activation mechanism, thermal batteries are widely adopted as military power sources. Li(Si)/
thermal batteries, which are used mostly in these days, use LiCl-KCl and LiBr-LiCl-LiF as molten salt electrolyte. However, it is known that Li(Si)/
thermal batteries have high internal resistance. Especially,
cathode accounts for the greater part of internal resistance in unit cell. Many efforts have been put into to decrease the internal resistance of thermal batteries, which result in the development of new electrode material and new electrode manufacturing processes. But the applications of these new materials and processes are in some cases very expensive and need complicated additional processes. In this study, internal resistance study was conducted by adding carbon black and carbon nano-tube, which has high electron conductivity, into the
cathode. As a results, it was found that the decrease of internal resistance of
cathode by the addition of carbon black and carbon nano-tube.