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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 13, Issue 6 - Dec 2010
Volume 13, Issue 5 - Oct 2010
Volume 13, Issue 4 - Aug 2010
Volume 13, Issue 3 - May 2010
Volume 13, Issue 2 - Apr 2010
Volume 13, Issue 1 - Jan 2010
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Study on Power Control and Optimal Management for Dog-Horse Robot
Kang, Tae-Ha ; Huh, Jin-Wook ; Kim, Jun ; Kang, Sin-Cheon ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 3, 2010, Pages 343~348
Recently, unmanned electric vehicles are increasingly interested among all of the world since they can provide low exhaust gas, high efficiency and high mobility. To exploit their silent maneuver and high mobility, unmanned electric vehicles have been developed since early 1980's for military. However, it is not easy to design and control a power system satisfying operating duration and mobility performance requirements based on various mission profiles for military use under the conditions of limited space and weight. Moreover it is also necessary to prevent over-charge, over-discharge and voltage unbalance between cells of battery to secure high voltage battery which is serially connected with muti-cells. In this paper, we presents power control and optimal management method for the dog-horse robot which adopts a electric power system and suggests a guide-line to manage and control to secure high voltage battery.
Development of Code for Numerical Analysis of Interior Ballistics using Eulerian-Lagrangian Approach and SMART scheme
Sung, Hyung-Gun ; Jang, Jin-Sung ; Lee, Sang-Bok ; Choi, Dong-Whan ; Roh, Tae-Seong ; Jang, Young-Jae ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 3, 2010, Pages 349~357
In this paper, a numerical code for the interior ballistics has been investigated. The Eulerian-Lagrangian approach and the SMART scheme have been used in the numerical code for the grain combustion. The translational kinetic energy of the projectile and work done against barrel friction have been considered only. The ghost cell extrapolation method has been used for the chamber change with the projectile movement. The calculation results of the numerical code have been compared and verified through those of IBHVG2 code.
The Research and Development Trend of Green Technology in the Field of Fire Power
Ahn, Sang-Tae ; Kang, Kuk-Jung ; Hong, Suk-Kyun ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 3, 2010, Pages 358~364
The necessity for harmonically growing of economy and environment has been on the rise late in the twentieth century. Green transformation is defined as efficiency enhancement of conventional guns and ammunitions. We also define green innovation as evolution of fire power systems breaking with conventional methodology. This kind of green innovation could even change a paradigm of warfare in the future. In this paper, we classify the green technology in the field of fire power into five technological groups, and the research and development trend of green technology in the field of fire power is analyzed.
A Study on Characteristics of a Pneumatic Device for Deploying Fins
Kang, Choon-Kil ; Won, Myong-Shik ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 3, 2010, Pages 365~371
The fins of a missile which is folded within a canister are deployed according to a command during the missile flight. The aerodynamic load generated by operating environments such as missile flight speed, platform movement speed and wind acts as an anti-deploying force and prevents the fins from deploying. As the diversification of platforms and the higher speed of missiles need a larger deploying force but the space for operating the fin deploying device is getting narrower, the new design concepts are required for developing such a device. In this study, a pneumatic device for deploying missile fins is designed and its characteristics are verified through experiments and analyses.
Numerical Investigation for Drag Prediction of an Axisymmetric Underwater Vehicle with Bluff Afterbody
Kim, Min-Jae ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 3, 2010, Pages 372~377
The objective of this study is to predict the drag of an axisymmetric underwater vehicle with bluff afterbody using CFD. FLUENT, commercial CFD code, is used to simulate high Reynolds number turbulent flows around the vehicle. The computed drag coefficients are compared to available experimental data at various Reynolds numbers. Four widely used two-equation turbulence models are investigated to evaluate their performance of predicting the anisotropic turbulence in a recirculating flow region, which is caused by flow separation arising from the base of the vehicle. The simulations with Realizable
SST turbulence models predict the anisotropic turbulent flows comparatively well and the drag prediction results with those models show good agreements with the experimental data.
A Study on Wideband Parabolic Gain Equalizer Design for High Power Transmitter
Kim, In-Seon ; Lee, Young-Joong ; Park, Joo-Rae ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 3, 2010, Pages 378~387
In this paper, we present new structure of wideband parabolic gain equalizer for TWT applied to printed circuit board. The gain equalizer is manufactured by using design variables of transmission line obtained from derived formulae. We compared the test results of two equalizers(reference equalizer and our equalizer). From that, we confirmed the validity of presented method. The presented equalizer is 1/3 times lighter, 1/2.7 times smaller and 1/10 times chipper than those of reference equalizer(Inmet company), respectively.
A Performance Study of Tactical Data Link Transceiver in TDMA Networks
Nam, Jeong-Ho ; Seo, Nan-Sol ; Jang, Dhong-Woon ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 3, 2010, Pages 388~396
Generally, flight information is transmitted by voice signal over legacy UHF radio in ground to air communication system. In this paper, we have implemented the transceiver of TDL(tactical data link) which transmits tactical information, such as flight information, using digital signal. For transmitting digital information over radio path, we have designed data modem that is processing CPFSK modulation, and TDMA(Time Division Multiple Access) network for Synchronization among multi user(platform). By simulating aeronautical propagation modeling with the environment of Korea terrain, it is predicted the maximum performance of communication range of the transceiver. As result of the transceiver's aviational boarding test, it is proved that the transceiver of TDL over legacy UHF radio transmits and receives the tactical information in TDMA network within communication range of 160km.
The Push Framework for UMPC Tactical Data Link(TDL) Based on The Legacy Radio
Sim, Dong-Sub ; Shin, Ung-Hee ; Kim, Ki-Hyung ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 3, 2010, Pages 397~404
Recently, there is on-going research about tactical data link system based on the legacy radio. Tactical data link based on legacy radio is operated mostly in narrow bandwidth under 25khz. Communicating traffics in nodes participated at network need to be minimized for distributing tactical data in narrow bandwidth. In addition, the data distributing structure is necessary for distributing tactical informations such as a situation awareness and so on to war fighters. However, conventional server-client system wastes a lot of time to obtain information for war fighters as user uses pull system to gather necessary information by seeking it one by one. Especially, the fighter pilot is supposed to dedicate into a situation awareness and fight mission in every seconds but seeking information of a user terminal while aircraft maneuvering affects as obstacle to concentrate engaging hostiles. therefore, push technology, the tactical data distributing system, is necessary for war fighters to receive fixed tactical data automatically without putting attention to it. This paper propose the UMPC tactical data link push framework. the UMPC tactical data link is a tactical data link system based on the legacy radio. Proposed push framework is verified by composing experiment environment and testing.
Performance Comparison of Channelization Schemes for Flexible Satellite Transponder with Digital Filter Banks
Lee, Dong-Hun ; Kim, Ki-Seon ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 3, 2010, Pages 405~412
The purpose of this paper is to compare complexity and to assess flexibility of competing transponder architectures for satellite communication services. For performance comparison, we consider three channelization techniques: digital down converter(DDC) based on the use of the cascaded integrator-comb(CIC) filter, tuneable pipeline frequency transform(T-PFT) based on the tree-structure(TS) and variable oversampled complex-modulated filter banks(OCM-FB) based on the polyphase FFT(P-FFT). The comparison begins by presenting a basic architecture of each channelization method and includes analytical expressions of the number of multiplications as a computational complexity perspective. The analytical results show that DDC with CIC filter requires the heavy computational burden and the perfect flexibility. T-PFT based on the TS provides the almost perfect flexibility with the low complexity over DDC with the CIC filter for a large number of sub-channels. OCM-FB based on the P-FFT shows the high flexibility and the best computational complexity performance compared with other approaches.
A Study on Estimation and Factors of VHF Data Link Range
Lee, Young-Joong ; Kim, In-Seon ; Park, Joo-Rae ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 3, 2010, Pages 413~420
An Estimation of VHF data link range for EW(Electronic Warfare) equipment in the sea environment was studied to predict the data link range between transmitting and receiving station. The theoretical estimation predicts within 3% error with actual measurement of VHF data link range at sea. Data link range factors including refraction and reflection are added in the basic wave propagation equation. The effect of refraction and reflection to the range is analysed with quantity level.
Derivation of JIC based JFC Analysis of the Aegis Korean BMD Using CASE Tool
Lim, Chong-Su ; Kwon, Yong-Soo ; Lee, Kyoung-Haing ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 3, 2010, Pages 421~430
This work describes a derivation process of JIC(Joint Integrating Concept) based JFC(Joint Functional Concept) analysis of an Aegis BMD(Ballistic Missile Defense). JIC is developed through JOC(Joint Operating Concept) and JFC based on capstone strategy and concept. Aegis BMD is a sea-based ballistic missile defense to detect ballistic missile threat, increase engagement battlespace and enable multiple engagement based on Aegis ships. Aegis BMD is a good case of JIC due to performing an Joint operations based on System of Systems under highly complicated NCW environment. This work analyses JFC using QFD(Quality Function Deployment) and UJTL(Universal Joint Task List). From this analysis the JIC of Aegis Korean BMD is derived using a CASE tool.
The Multiple Traveling Purchaser Problem for Minimizing Logistics Response Time in Wartime
Choi, Myung-Jin ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 3, 2010, Pages 431~437
It's strongly needed to minimize the logistics response time for supporting military operations in wartime. In this paper, we suggest the ILP formulation for minimizing logistics response time in wartime. Main structure of this formulation is based on the traveling purchaser problem(TPP) which is a generalized form of the well-known traveling salesman problem(TSP). In the case of general TPP, objective function is to minimize the sum of traveling cost and purchase cost. But, in this study, objective function is to minimize traveling cost only. That's why it's more important to minimize traveling cost(time or distance) than purchase cost in wartime. We find out optimal solution of this problem by using ILOG OPL STUDIO(CPLEX v.11.1) and do the sensitive analysis about computing time according to number of operated vehicles.
Echelons Scale Identification Scheme of Surveillance and Reconnaissance Sensor Network
Choi, Ji-Hye ; Kwon, Tae-Wook ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 3, 2010, Pages 438~444
Surveillance and reconnaissance sensor network system is an application system based on ubiquitous sensor network technology. This technique is to avoid accidental close combat, to minimize the consumption of limited military resources and personnel, and to provide battlefield situational awareness information for the unit's future combat missions. In this paper, we have proposed a echelons scale identification scheme based on information obtained from surveillance and reconnaissance sensor network system.
A Target Segmentation Method Based on Multi-Sensor/Multi-Frame
Lee, Seung-Youn ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 3, 2010, Pages 445~452
Adequate segmentation of target objects from the background plays an important role for the performance of automatic target recognition(ATR) system. This paper presents a new segmentation algorithm using fuzzy thresholding to extract a target. The proposed algorithm consists of two steps. In the first step, the region of interest(ROI) including the target can be automatically selected by the proposed robust method based on the frame difference of each image sensor. In the second step, fuzzy thresholding with a proposed membership function is performed within the only ROI selected in the first step. The proposed membership function is based on the similarity of intensity and the adjacency of target area on each image. Experimental results applied to real CCD/IR images show a good performance and the proposed algorithm is expected to enhance the performance of ATR system using multi-sensors.
A Novel Timing Control Method for Airborne SAR Motion Compensation
Lee, Hyon-Ik ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 3, 2010, Pages 453~460
For high quality image acquisition, compensating air-vehicle motion is essential for airborne SAR system. This paper describes a timing control based motion compensation method for airborne SAR system. Efficient timing control is critical for SAR system since it maintains many timing signals and timing setting for the signals should be updated frequently. This paper proposes Timing Cluster method as an efficient means for timing control of SAR system. Moreover, this paper suggests a simple and efficient method to compensate air-vehicle motion based on the Timing Cluster method. Timing Cluster method enables SAR system to control the timing in a timing noncritical way just maintaining little amount of information.
Improved Fusion Method of Detection Features in SAR ATR System
Cha, Min-Jun ; Kim, Hyung-Myung ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 3, 2010, Pages 461~469
In this paper, we have proposed an improved fusion method of detection features which can enhance the detection probability under the given false alarm rate in the prescreening stage of SAR ATR(Synthetic Aperture Radar Automatic Target Recognition) system. Since the detection features have the positive correlation, the detection performance can be improved if the joint probability distribution of detection features is considered in the fusion process. The detection region is designed as a simple piecewise linear function which can be represented by few parameters. The parameters for the detection region can be derived by training the sample SAR images to maximize the detection probability with the given false alarm rate. Simulation result shows that the detection performance of the proposed method is improved for all combinations of detection features.
Modeling of Surface Temperature Characteristics on the Ground by using the Measured Weather Condition Data
Choi, Jun-Hyuk ; Park, Tae-Won ; Kim, Tae-Kuk ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 3, 2010, Pages 470~477
This paper is a part of developing a program that predicts the surface temperature and the IR images of ground objects by considering solar irradiation and atmospheric convection. The thermal modeling is essential for identifying objects on the scenes obtained from the remote sensing. And the temperature distribution on the objects is necessary to obtain their infrared images in contrast to the background. We considered the composite heat transfer modes including conduction, convection and spectral solar radiation incident on the objects within a scene to calculate the surface temperature distribution. The surface temperatures obtained by using the S/W developed in this study(Silhouette) and a commercial S/W(SE-Workbench-IR) are computed and compared each other. Results obtained by using the S/W developed in this study(Silhouette) show fairly good agreement with those obtained by the SE-Workbench-IR.
ELISA Validation for anti-PA Antibody Titer Measurements
Kim, Yu-Gene ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 3, 2010, Pages 478~485
The vaccine is biological pretreatment that improves immunity to a particular disease. We can get immunity from producing antibody with injection antigen which has ability to defense against the disease. The ELISA is the most widely used method to measure antibody titer. We have developed and performed validation of ELISA according to the guideline of KFDA and ICH. In this paper, we have verified ELISA method is an excellent method to measure the titer of anti-PA antibody. We have constructed recombinant protective antigen among anthrax toxins and used as antigen of ELISA. In this validation, we have evaluated precision (repeatability, interlaboratory precision), specificity, linearity(range) and LOD, which are validation articles suggested by guideline. Inter-person precision was replaced with inter-laboratory precision. From the results, we have confirmed high precision in all experiments with CV under 20%.
An Experimental Study on Shielding Apparatus for the Impulse Noise of K2 Rifle
Lee, Jin-Ho ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 3, 2010, Pages 486~492
This paper studies an experimental analysis of the impulse noise of K2 rifle when its bullet passes through the large tube(length 1.84m, outer diameter 50cm, glass wool & steel). In experiment, the characteristics of the sound of shooting were different according to the way of shooting; the results of the experiment are given below. First of all, the shooting sound was lower in single-shot shooting, when compared to 3rds burst-shot shooting, difference averaging 2.8dB, 4.0dB at maximum. In short, the difference is minuscule. Secondly, the sound of the K2 rifle was diminished when shot in a tube, ranging from 2.7dB to 15.4dB, averaging 8.2dB. Thirdly, the shooting sound of the K2 rifle was diminished as the insertion depth deepened with formulas given in Fig. 5, 6. Fourthly, basic data for excluding sound of the shooting were presented. Lastly, the characteristics of the shooting sound could be equally used as a basic material for developing marksmanship and sharp-shooting detection device.
A Study of the Ionization Characteristics of Xenon Gas by Shock Compression
Lee, D.S. ; Shin, J.R. ; Choi, J.Y. ; Choi, Y.S. ; Kim, H.W. ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 3, 2010, Pages 493~502
In this paper, the ionization characteristics of noble gases are studied numerically behind strong shock waves. As a first step, the equilibrium ionization mechanism of noble gases is modeled in wide ranges of temperature and pressure. As a next step the equilibrium ionization model is coupled with fluid dynamic equations to analyze the local thermodynamic equilibrium(LTE) ionization process at high temperature and pressure conditions behind the strong imploding shock waves. The ionization characteristics of xenon gas is studied in a wide range of test conditions with thermal radiation effects. Hence, the results give optimal conditions of maximum ionization and radiation behind the imploding shock waves.
A Study on the Analysis of Surface Heat Flux Using the Transient Heat Flux Method
Yi, Jong-Ju ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 3, 2010, Pages 503~510
The quick variation of the canister wall temperature causes the modification of the shape of canister wall. This paper is the possibility of adoption and the error analysis about the transient heat flux method. The commercial code(Fluent Ver6.2.16) was employed for the calculation of surface temperature in the case of steady and unsteady heat flux condition. Based the surface temperature variation and surface material property, transient heat flux method can calculate the surface heat flux. In the case of steady heat flux condition, the error is about 2%, and in the case of unsteady heat flux condition, the error is about 3.6%. With the unsteady heat flux condition, the time which reach the maximum surface heat flux is almost same between the numerical analysis and transient heat flux method.