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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 14, Issue 6 - Dec 2011
Volume 14, Issue 5 - Oct 2011
Volume 14, Issue 4 - Aug 2011
Volume 14, Issue 3 - Jun 2011
Volume 14, Issue 2 - Apr 2011
Volume 14, Issue 1 - Feb 2011
Selecting the target year
Noise Equivalent Differential Temperature of Passive FTIR Sensor System
Kang, Young-Il ; Park, Byeong-Hwang ; Choi, Myung-Jin ; Hong, Dea-Sik ; Choi, Soo ; Kim, Dong-Hwan ; Park, Do-Hyun ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 2, 2011, Pages 161~166
DOI : 10.9766/KIMST.2011.14.2.161
The passive open-path Fourier-Transform-Infrared system was implemented for the toxic gas monitoring. Noise Equivalent Differential Temperature(NEDT) was investigated as a system performance evaluation figure and analyzed numerically with the designed parameters. Calculated NEDT was compared with the experimental value in the wavelength region of
. The minimum detectable gas concentration was estimated from the obtained NEDT at the absorption wavelength of
A Study on Variation of an Accuracy Rate as the Gradient of a Pistol
Yeo, Woon-Joo ; Lee, Joon-Ho ; Choi, Eui-Jung ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 2, 2011, Pages 167~172
DOI : 10.9766/KIMST.2011.14.2.167
In this paper, a study on variation of an accuracy rate as the gradient of a rifle is shown. In the a state of hostilities, a soldier is not easy to take a shot vertically against the ground. If a soldier shoots as the pistol is inclined, how the accuracy rate is changed. While the pistol is shot, the change of ballistic curve is estimated. And we also verify the accuracy rate through the firing test. Then we compare two results and present some ideas which overcome the decrease of an accuracy rate. Hereafter, it is possible to adapt in the future soldier system and expected that the accuracy rate of the conventional gun is maintained.
Method of MBT Movement Modeling for Performance Analysis of SRMD System
Ha, Jong-Soo ; Cho, Kyu-Gong ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 2, 2011, Pages 173~180
DOI : 10.9766/KIMST.2011.14.2.173
SRMD system which protects MBT from the threats in a short range is composed of 2 radars, 2 IRTs 1 CCU and 2 countermeasures. To analyze the performance of this system, there is a need to make the model of MBT on which this system is loaded. In this paper, a method of MBT movement modeling is proposed to fulfill the above need. The methods of the coordinate system transformation among the components and the modeling of a hull's traveling and a turret's turning are proposed. The method of the modeling of a pose variation caused by the vibrations is proposed and the results of the modeling are presented.
A Simulation Technique of the Shipboard INS Transfer Alignment Environments using Hardware-In-the-Loop Simulation
Kim, Woon-Sik ; Yang, Tae-Soo ; Kim, Sang-Ha ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 2, 2011, Pages 181~188
DOI : 10.9766/KIMST.2011.14.2.181
A simulation technique, which simulate dynamic motion and communication environments of ship in the lab, is needed in order to reduce the testing cost when we evaluate the transfer alignment performance of shipboard INS. Hardware-In-the-Loop Simulation(HILS) can be used as an effective test method for those system because it can provide flexible and realistic simulation environments, various test scenario, and repeated test environment in the lab without additional cost and person. This paper presents the methods for implementing the real time HILS environment for testing transfer alignment performance of shipboard INS. It includes real time executive for controlling realtime simulation and calculating the ship motion, communication method for interfacing between the systems, and coordinate transformation method for converting real ship coordinate attitude data to lab coordinate attitude data.
A Revisit to the Myungryang Naval Battle through Hindcasting Tidal Currents and Tides
Byun, Do-Seong ; Lee, Min-Woong ; Lee, Ho-Jung ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 2, 2011, Pages 189~197
DOI : 10.9766/KIMST.2011.14.2.189
As a multidisciplinary study encompassing oceanography and history, we have attempted to reanalyze the course of a historical navel battle, Myungryang Naval Battle(September 16th, 1597 according to the lunar calendar) through hindcasting the paleo-tidal currents and -tides(PTC). Firstly, we conducted harmonic analysis using 6-month current data observed at Uldolmok and 1-year elevation data provided by Korea Ocean Research and Development Institute in order to understand their characteristics and to hindcast the PTC. Observation results show that Uldolmok, ~300m wide, relatively narrow channel, is characterized by a flood-dominant mixed mainly semidiurnal tidal regime induced by relatively-strong shallow water constituents, showing closely a standing wave type of tidal current. Further, we hindcasted PTC on the day of Myungryang Naval Battle. Our results were compared and discussed with results(time and speeds of maximum(flood and ebb) currents and high and low water times) of the previous studies estimated from different methods. Lastly, we reconstruct the course of the event of Myungryang Naval Battle recorded in the Admiral Sun-Sin Yi's War Diary(Nangjung Iigi in Korean) based on our hindcasting results.
Measurement of Turbulent Wake behind a SUBOFF Model and Derivation of Experimental Equations
Shin, Myung-Soo ; Moon, Il-Sung ; Nah, Young-In ; Park, Jong-Chun ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 2, 2011, Pages 198~204
DOI : 10.9766/KIMST.2011.14.2.198
This paper presents the experimental result to investigate the characteristics of turbulent wake generated by submarine. A SUBOFF nude model which was assumed as an axial -symmetric body was used to create wake, and a thin strut was mounted on the top of the model. The experiments were conducted in a circulating water channel(CWC), and a hot-film was used to measure the turbulence in wake cross-section at the distance range of 0.0~2.0L from the model. The hot film anemometer measured turbulent velocity fluctuations, and the timeaveraged mean velocity and turbulent intensity are obtained from the acquired time-series data. Measured results show well the general characteristics of turbulent intensity, kinetic energy and mean velocity distribution. Also, experimental equations are derived. These experimental equations show well the general characteristics of the turbulent wake behind the submerged body with simple configuration.
Seasonal Variations and Characteristics of the Stratification Depth and Strength in the Seas Near the Korea Peninsular using the Relative Potential Energy Anomaly
Cho, Chang-Bong ; Kim, Young-Gyu ; Chang, Kyung-Il ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 2, 2011, Pages 205~212
DOI : 10.9766/KIMST.2011.14.2.205
In this paper, we have proposed a method for quantization of the stratification strength in the sea water and analysing the distributions of the maximum stratification depths calculated by the method at the seas near the Korean peninsular. For calculating the stratification strength, modified and applied the potential energy anomaly formular which was suggested by Simpson in 1977. The data had been collected by NFRDI from 1971 to 2008 were used to determine the maximum vertical density gradient depth and the relative potential energy anomaly at that depth. In the East Sea, the stratification depth has become deepened about 20m in February and April since 1971. In Yellow-South Sea, the maximum density gradient depth has been deepened about 10m only in December during the same period and the difference of the stratification depth between summer and winter has been enlarged. These trends of variation of stratification strength and depth near the Korean peninsular should be investigated more carefully and continuously. And the results of these studies could be adopted for the more efficient operation of underwater weapon and detection systems.
Design on Flight-Critical Function of Mission Computer for KUH
Yu, Yeon-Woon ; Kim, Tae-Yeol ; Jang, Won-Hong ; Kim, Sung-Woo ; Lim, Jong-Bong ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 2, 2011, Pages 213~221
DOI : 10.9766/KIMST.2011.14.2.213
Avionics system tends to be designed to have the integrated architecture, and it is getting difficult and complex to verify the flight-critical function because of sophisticated structure. In Korean Utility Helicopter, mission computer acts as the MUX Bus Controller to handle the data from both communication, identification, mission/display and survivability equipment inside Mission Equipment Package and aircraft subsystems such as fuel system and electrical system while it is interfacing with Automatic Flight Control System and Full-Authority Digital Engine Control via ARINC-429 bus. The Flight Displays which is classified as flight-critical function in aircraft is implemented on Primary Flight Display after mission computer processes data from AFCS in order to generate graphics. This paper defines the flight-critical function implemented in mission computer for KUH, and presents the static and dynamic test procedures which is performed on System Integration Laboratory along with Playback Recorder prior to flight test.
The Design and Implementation of S/W Packet Modem based on Frequency Hopping Legacy Radio System
Koo, Jung ; Pyo, Sang-Ho ; Kang, Kyeong-Sung ; Kim, Ki-Hyung ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 2, 2011, Pages 222~231
DOI : 10.9766/KIMST.2011.14.2.222
In this paper, we have proposed a method which can make it possible to stably transmit and receive data like the ARC-164 radio frequency hopping environment as a S/W packet modem with PSK modulation. This is a method that the S/W packet modem with PSK digital modulation and the use of PC sound cards change over from data to voice signals and then transmit/receive data. We confirmed not only that it is possible to solve the slow speed communication with the use of sending data through multi-channels and PSK modulation that has the ability to methodically improve transmission rates, but also that it is possible to send the state of frequency hopping stably. In conclusion, we've confirmed both tactical values that though the transmission rate may be a tad slow, a state of frequency hopping of more than 94% confidence plus voice and data can be sent via radio at the same time. In this paper, the proposed S/W packet modem is only an implemented S/W component, so when we apply it to aircraft that we don't consider EMC problems with, then we have the advantage of a wider use of conventional UHF/VHF/HF radio that is possible to voice communication. If we recognize these operational requirements, we can apply for a lot of field equipment efficiently.
An Analysis on GPS Jammer Operational Range Against GPS Receiver in Sea Environment
Lee, Young-Joong ; Park, Joo-Rae ; Kim, Jong-Kyu ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 2, 2011, Pages 232~237
DOI : 10.9766/KIMST.2011.14.2.232
This paper analyzed the J/S of the GPS receiver in sea environment from GPS satellite and GPS jammer. Through the analysis, the operational range and effective radiation power of the GPS jammer could be estimated. In the case of the jammer effective radiation power is higher than the specific value, jammer height mainly resolves the jammer operational range.
A Study on a S Box Redesign using DES Key Expansion
Lee, Jun ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 2, 2011, Pages 238~245
DOI : 10.9766/KIMST.2011.14.2.238
We suggest a DES key expansion algorithm which is strong enough to overcome Differential Cryptanalysis(DC) and Linear Cryptanalysis(LC). Checking the weak points of DES, we found that the opened S box provide all information on the various kinds of attack. Using the key expansion we redesigned the S box which is not open to anybody who has no key. DC and LC can not be applied to the suggested algorithm without the redesigned S box information. With the computer experiments we show that the efficiency of this algorithm is almost the same as that of DES with respect to the crypto speed.
Review : Present Status of Green Chemistry
Lee, Jun-Wung ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 2, 2011, Pages 246~263
DOI : 10.9766/KIMST.2011.14.2.246
Mankind has just begun to recognize that the most crucial factor to achieve the sustainable society in the future is green technology. Most countries support the development of green technology to prevent catastrophes from global warming, mainly in the areas of reducing carbon dioxide from the atmosphere. However, most products we consume in everyday life are produced through chemical processes, and we often oversee the fact that the huge amount of waste and energy during these chemical processes will seriously influence our goal to achieve our future society sustainable. Thus the technologies to minimize the amount of disposed waste and energy consumption during chemical processes may be more important than to reduce the greenhouse gases. In this regard this review introduces the recent status of green chemistry and future prospects in order to help our chemists and engineers establish research projects based on the green chemistry principles.
Design and Performance Analysis of Environment Friendly Double Core Bullets for Small Arms
Hong, Jun-Hee ; Jang, Tak-Soon ; Song, Chang-Bin ; Kim, Byung-In ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 2, 2011, Pages 264~270
DOI : 10.9766/KIMST.2011.14.2.264
This paper focuses on possibility to design and fabrication new combination of bullet core to substitute current toxic material of heavy metal such as lead by environment-friendly ones. The core is designed as dual structure to manipulate the core center of gravity easily by combining materials, which of basis is tungsten of low cost and easily acquired. Those combinations are W-M series such as W-Cu, W-Sn, W-Cu-Sn, and W-Cu-Ni to target the density of lead,
through powder-metallurgy. Out of four, combination of W-Cu-Ni shows the highest compression density of 96% and is confirmed as the most suitable substitution for lead due to the excellent property of matter and sintering. All combination samples is simulated on the PRODAS software for designing and structure analysis by adjusting the center of gravity of dual core samples forward and backward. The simulations confirm the similarity of current bullet core with respect to properties of mass, aero dynamics, and flying stability.
The Performance Analysis of Integrated Navigation System Based on the Tactical Communication and VISION for the Accurate Localization of Unmanned Robot
Choi, Ji-Hoon ; Park, Yong-Woon ; Song, Jae-Bok ; Kweon, In-So ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 2, 2011, Pages 271~280
DOI : 10.9766/KIMST.2011.14.2.271
This paper presents a navigation system based on the tactical communication and vision system in outdoor environments which is applied to unmanned robot for perimeter surveillance operations. GPS errors of robot are compensated by the reference station of C2(command and control) vehicle and WiBro(Wireless Broadband) is used for the communication between two systems. In the outdoor environments, GPS signals can be easily blocked due to trees and buildings. In this environments, however, vision system is very efficient because there are many features. With the feature MAP around the operation environments, the robot can estimate the position by the image matching and pose estimation. In the navigation system, thus, operation modes is switched by navigation manager according to some environment conditions. The experimental results show that the unmanned robot can estimate the position very accurately in outdoor environment.
A Variable Quantization Coefficient Scanning for Macroblock Considering the Histogram Value of Previous Macroblock's Quantization Coefficient
Hyun, Myung-Han ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 2, 2011, Pages 281~288
DOI : 10.9766/KIMST.2011.14.2.281
In this paper, a variable quantization coefficient scanning for macroblock considering the histogram value of previous macroblock's quantization coefficient is proposed. In order to scan a quantization coefficient, the proposed method makes
histograms for various prediction modes(
) by adding 1 if the value of quantization coefficient is not 0. After a final mode decision procedure, the
histogram of the final mode will be sorted. Then, quantization coefficients in corresponding macroblock of the next frame are scanned using the sorted order. The experimental results show that the proposed scheme reduces the total bits by approximately 0.01~2.25% with similar PSNR performance compared with the previous method.
Application of TMAH-based Pyrolysis Mass Spectrometry to a Biological Detection System
Kim, Ju-Hyun ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 2, 2011, Pages 289~298
DOI : 10.9766/KIMST.2011.14.2.289
TMAH-based Py-MS has been investigated to apply for a real-time classification of biological agents in the field. Acquiring reproducible data from mass spectrometry is a key to biological detection in the field. Nevertheless, it has been little studied on what factors could affect to the reproducibility of the TMAH-based Py-MS spectrum patterns. Given the TMAH-based Py-MS applied to the field system, several factors which could affect to the reproducible pattern of TMAH-based Py-MS spectra are needed to be examined, including changes in TMAH injection volume, growth temperature for microorganism, and number of cells collected in pyrolyzer, and implication of stabilizer used for lyophilization. This study showed that the reproducibility of the spectrum patterns was significantly hindered by changes in TMAH concentration and cell number, and stabilizer implication but not by growth temperature. Among those at low TMAH concentration(0.015m) was not observed the significant alterations of the spectrum pattern even when its injection volume was changed, yet was in different cell numbers and stabilizer implication.
Development and Application of the Semiconductor Neutron Radiation Detector
Lee, Nam-Ho ; Lee, Hong-Kyu ; Youk, Young-Ho ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 2, 2011, Pages 299~304
DOI : 10.9766/KIMST.2011.14.2.299
In this paper, we developed the semiconductor neutron radiation detector and the multi-purpose radiation detection technologies for the next generation military personal surveymeter. The PIN type semiconductor neutron detector and the prototype measure the neutron radiation dose upto 1,000cGy with
error. It also have a good performance about the Gamma, Alpha and Beta radiation and MIL-STD-810F.
Strain-specific Detection of Bacillus Anthracis using Multiple-locus Variable-number Tandem Repeat Analysis
Jung, Kyoung-Hwa ; Kim, Sang-Hoon ; Kim, Seong-Joo ; Kim, Ji-Cheon ; Chai, Young-Gyu ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 2, 2011, Pages 305~312
DOI : 10.9766/KIMST.2011.14.2.305
Bacillus anthracis(Ba) is a Gram-positive spore-forming bacterium that causes the disease anthrax. The feature of Ba is the presence of two large virulence plasmids, pXO1 and pXO2. Molecular genotyping of Ba has been difficult to the lack of polymorphic DNA marker. Ba isolated from Korea has been genotyped using various nucleotide analysis methods, such as 16s rDNA sequencing and multiple-locus variable-number tandem repeat (MLVA) analysis. We identified genotypes that represent a genetic lineage in the B1 cluster. This study emphasized the need to perform molecular genotyping when attempting to verify a strain-specific Ba.
A Syudy on Applications of Convex Hull Algorithm in the SPH
Lee, Jin-Sung ; Lee, Young-Shin ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 2, 2011, Pages 313~320
DOI : 10.9766/KIMST.2011.14.2.313
SPH(Smoothed Particle Hydrodynamics) is a gridless Lagrangian technique that is useful as an alternative numerical analysis method used to analyze high deformation problems as well as astrophysical and cosmological problems. In SPH, all points within the support of the kernel are taken as neighbours. The accuracy of the SHP is highly influenced by the method for choosing neighbours from all particle points considered. Typically a linked-list method or tree search method has been used as an effective tool because of its conceptual simplicity, but these methods have some liability in anisotropy situations. In this study, convex hull algorithm is presented as an improved method to eliminate this artifact. A convex hull is the smallest convex set that contains a certain set of points or a polygon. The selected candidate neighbours set are mapped into the new space by an inverse square mapping, and extract a convex hull. The neighbours are selected from the shell of the convex hull. These algorithms are proved by Fortran programs. The programs are expected to use as a searching algorithm in the future SPH program.
A Study on Normal Penetration Characteristics of Small Projectiles in Concrete Targets
Kim, Yong-Seok ; Yeo, Hwan-Gon ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 2, 2011, Pages 321~325
DOI : 10.9766/KIMST.2011.14.2.321
After investigating the analytic model to predict penetration depth, we propose an analytical model which can be used in estimating the normal penetration characteristics of small projectiles, when they are impacted to the concrete targets with ordnance velocities. The major parameters of this model are nose factor of penetrator, compressive strength and density of targets, and impact velocity. We can predict accelerations, velocities, displacements of projectiles and applied forces by this proposed model. Estimated penetration depths were shown 5% error. We also verified the usefulness of the new method with laboratory impact test data.