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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korea Institute of Military Science and Technology
Journal Basic Information
Journal DOI :
The Korea Institute of Military Science and Technology
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Volume & Issues
Volume 7, Issue 4 - Dec 2004
Volume 7, Issue 3 - Sep 2004
Volume 7, Issue 2 - Jun 2004
Volume 7, Issue 1 - Mar 2004
Selecting the target year
A Numerical Study on the Shock Resistance Test of Aluminium 2519 Plate
Koo Man-Hoi ; Woo Ho-Gil ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 3, 2004, Pages 11~20
In this paper, the acceptance criteria(Striking Velocities) for the A12519 weldments have been developed. Dynamic impact simulation of A12519 plate was achieved by using LS-DYNA, and predict the projectile velocity and the crack length. Also, Ballistic impact tests of A12519 plate have been performed, and compared with analysis results. Critical velocities of A12519 plate were acquired respectively, and striking velocities of A12519 weldments were calculated. Present work data will be used by basic data in ballistic impact test for A12519 weldments.
Aerodynamic Heating Analysis of Spike-Nosed Missile
Jung Suk Young ; Yoon Sung Joon ; Byon Woosik ; Ahn Chang Soo ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 3, 2004, Pages 21~29
Numerical analysis of aerodynamic heating for KPSAM is performed using aerodynamic heating model suitable to KPSAM, which has complex flow field resulting from the spike attached to the dome, such as large separation area and the strong shock/boundary layer interaction region around reattachment point on the dome. The aerodynamic heating model is validated and modified through the comparison between the flight test measurement and the thermal analysis results. TFD temperature sensors are installed on the dome to measure surface temperature during the flight. Computation results, obtained from the heat transfer analysis on the sensors, agree well with flight test data. The aerodynamic heating model provides heat transfer rate into surface as a boundary condition of unsteady 1D/axisymmetric thermal analysis on the missile structure. The axisymmetric thermal analysis using FLUENT is more versatile than the 1D analysis and can be applied to the heating problem related with complex structures and multi-dimensional heat transfer problems such as prediction of temperature rise at contact surface of different materials.
A Study on the Alignment of Aiming Sight Unit for Infrared Homing Missile
Jung Young-Sook ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 3, 2004, Pages 30~37
For a proper operation of portable air defense IR terminal homing missile to the rapid intruding target, the boresight of an IR seeker of the missile should be accurately aligned with the gunner's aiming sight. Before a gunner fires the missile, he tries to keep the target within the circle of ASU ensuring the seeker to lock on the target correctly. In this paper, using an electrical seeker caging loop and IR detector signal characteristics, a precise aligning method between the seeker boresight and the LOS(Line of Sight) of ASU(Aiming Sight Unit) was studied. Although every seeker has slightly different SLA (Signal of Look Angle) output, we can get negligible alignment error through a fine tuning method of electrical caging signal. This alignment procedure was also adopted in K-PSAM system.
A Study on the modeling of horizontal launch at submarine in the preliminary design phase
Kim Dong-Hun ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 3, 2004, Pages 38~46
This paper deals with the development of simulation model for the horizontal launch at submarines in the preliminary design phase. The simulation model is composed of submarine motion model, cross flow force model in the bow of submarine, and weapon motion model In launch through torpedo tubes. Using submarine and weapon characteristics and simulation condition, it can simulate the exit velocity of weapon through torpedo tubes and reaction forces. It should be helpful for the analysis of the safe launch and design requirements in the preliminary design phase of a submarine or a weapon launched through torpedo tubes.
A Study on the submarine operational effectiveness simulation model in the concept design phase
Park Jun-Kyu ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 3, 2004, Pages 47~58
This paper focuses on the technical information about the development of the submarine operational effectiveness simulation model for the feasibility study stage of the submarine design. The simulation model is classified into simulation control model and system model. Using user input and related performance parameters, it can simulate various scenarios by no change of the program because it includes tactic manager which makes decision about every situation. And the Monte-Carlo simulation mode which provides the stochastic results is available. Through the test simulation, the usefulness of the simulation model was verified. It should be helpful for the analysis of the submarine operational effectiveness by diversified scenarios in the concept design phase..
A Study on the Conceptual Design of an Unmanned Surface Vehicle(USV) for the Korean Navy
Boo Sung Youn ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 3, 2004, Pages 59~68
Unmanned surface vehicles(USVs) have been developed for special operations in foreign navies. These will be employed to conduct critical missions including inspection, coast guard, ISR, fire protection, precision strike, mine interception warfare and antisubmarine warfare. It is also known the USVs will be deployed at the front line of the network-centric warfare to replace the manned naval operations. The unmanned operation can, thus, minimize unnecessary risk to personnel and enhance the success probability for the imposed mission. In this research, the USVs which are under operation and development in foreign navies are investigated. Based on this, an USV with
of length and 10ton of weight for the Korean Navy which can be deployed near the Northern Limit Line(NLL), is proposed.
An Inverse Design for Nose Shape of a Cylindrical-Shaped Submerged Body
Jung Chul-Min ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 3, 2004, Pages 69~76
In this paper, an efficient inverse design method for nose shape of submerged body based on the MGM(Modified Garabedian-McFadden) design method has been developed. The MGM design method is a residual-correction technique, in which the residuals are differences between the desired and the computed pressure distributions. 3-D incompressible Wavier-Stokes equation was adopted for obtaining the surface pressure distribution and combined with the MGM design method to perform the inverse design of nose shape of submerged body. The design method was verified by applying to several airfoil shapes. Improved design shapes could be obtained when the method was applied to nose shapes of submerged body.
Scheduling for Military Training of Serials with Partial Precedence Relationships based on the Assignment Problem
Lee Ho-Joo ; Kim Yeong-Dae ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 3, 2004, Pages 77~83
This paper focuses on a scheduling problem of military training. Repetitive and identical training over multiple serials is a common type of military education. A simple but systematic method is suggested to determine a training schedule for small groups divided from each serial. A satisfactory training schedule and the number of such small groups can be determined by iteratively solving assignment problems with additional constraints. With this method, loads of instructors can also be balanced without violating constraints associated with precedence and continuity relationships among lectures.
Investigation of Forming Stabilities Criteria in Hot Backward Extrusion of Ti-6Al-4V
Yeom Jong-Taek ; Park Nho-Kwang ; Lee You-Hwan ; Shin Tae-Jin ; Hwang Sang-Mu ; Hong Sung-Suk ; Shim In-Ok ; Lee Chong-Soo ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 3, 2004, Pages 84~92
The metal forming behavior of Ti-6Al-4V tube during hot backward extrusion was investigated with various forming stabilities or instabilities criteria. that is, Ziegler's instability criterion, dynamic materials model(DMM) stability criteria and Rao's instability criterion. These approaches also were coupled to the internal variables generated from FE simulation. In order to validate the reliabilities of three criteria, hot backward extrusions for Ti-6Al-4V tube making were carried out with different backward extrusion designs. The useful model for predicting the forming defects was suggested through the comparison between experimental observations and simulation results.
Design and Fabrication of a W-band FMCW Radar for the Metal Target Detection Under the Ground Clutter Environment
Park Jung-Dong ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 3, 2004, Pages 93~100
In this paper, we describe the design, fabrication, and test results of a W-band FMCW radar for the metal target detection under the ground clutter environment. In order to detect metal targets on the ground, we used a single cassegrain antenna with the beamwidth of
which forms pencil-beam footprint on the ground. A log envelope detector was applied to improve radar performance in the severe ground clutter known as Weibull and log normal clutter. The designed FMCW radar can acquire altitude information from the ground clutter with
at the height of 160m. The fabricated W-band FMCW radar transmits 11 dBm power and the dynamic range of the receiver is from -106dBm to -30dBm. The performances of the fabricated sensors were tested out in the fields and detected a car target of 200m apart on the grass.
Regional Dynamic Range Histogram Equalization for Image Enhancement
Lee Eui-Hyuk ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 3, 2004, Pages 101~109
Image enhancement for Infrared imaging system is mainly based on the global histogram equalization. The global histogram equalization(GHE) is a method in which each pixel is equalized by using a whole histogram of an image. GHE is speedy and effective for real-time imaging system but its method fails to enhance the fine details. On the other hand, the basic local histogram equalization(LHE) method uses sliding a window and. the pixels under the window region are equalized over the whole output dynamic range. The LHE is adequate to enhance the fine details. But this method is computationally slow and noises are over-enhanced. So various local histogram equalization methods have been already presented to overcome these problems of LHE. In this paper, a new regional dynamic range histogram equalization (RDRHE) is presented. RDRHE improves the equalization quality while reducing the computational burden.
Characteristics study of biological materials using pyrolysis-mass spectrometry
Choi Sun-Kyung ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 3, 2004, Pages 110~121
Pyrolysis-mass spectrometry, incorporating an in situ thermal hydrolysis and methylation(THM) step, has been used to study biological materials for bacteria, toxin and virus. Newly developed pyrolyzer was used to decompose biological materials, and tetramethylammonium hydroxide(TMAH) was used as a methylation reagent. Chemical ionization(CI) using ethanol and ion trap mass spectrometer(ITMS) were used to ionize and analyze of pyrolysis components, respectively. Analytical characteristics of bacteria (including spore), virus and toxin were analyzed. Also acquisition and interpretation of mass spectra as biomarkers for classification/identification of biological material s were explained.
Internal Blast Tests of Developed Explosives
Kim Sung-ho ; Kim Jeong-kook ; Lee Jun-wung ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 3, 2004, Pages 122~128
Internal blast performance test on developed explosives was carried out. Internal blast means a blast wave in closed chambers like tunnels, bunkers, operation center and chamber of ships. We used Anpa tunnel for our test facility. We performed two series of tests to measure internal blast of developed explosives. Three different kinds of cast PBXs, DXD-09, DXD-10, DXD-18, and conventional explosive, Tritonal, were used in our test. The explosives were cast as a charge of 108mm diameter in a plastic tube of a 3mm thickness. The length of charges 4ere adjusted as a weight 3kg. A melt-cast explosive, tritonal, was used as a reference. Pentolite booster was used. The cylindrical boosters have a 95mm diameter and 47.5mm height. The results showed that there may be some differences between the performances in the air blast tests and those in the internal blast tests. The results showed that DXD-10, the best performance in air blast tests, showed the poorest performance in internal blast among the explosives tested. On the other hand, DXD-18 showed exactly the opposite trend. This is probably due to the highest contents of aluminum and inert binder in DXD-18. DXD-18 has
of aluminum and
of inert binders.
Development of the formulation and the process of DXD-19 sheet explosive
Cheun Young Gu ; Lee Jin Sung ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 3, 2004, Pages 129~139
DXD-19 is a flexible sheet explosive, which is a new polymer-bonded explosives(PBX's). DXD-19 is relatively insensitive and can be extruded into various configurations to be applied to munitions. A typical application includes multi-point initiation for the warhead, cutting/severance devices and transfer lines. The DXD-19 composition employs a binder system derived from the thermoplastic elastomer(HyTemp 4454) containing
OH terminated with isocyanate curable for increasing mechanical properties. The use of an elastomer CAB increases its mechanical properties and the use of an energetic plasticizer BDNPF/BDNPA(F/A) improves the process ability as well as energy contents. The composition of the extruded DXD-19 formulation is formed
. Our safety tests of DXD-19 shows Insensitivity to an impact test and friction test, good thermal stability and excellent mechanical properties.
A Study on Actuator Fault Detection and Isolation in Airplanes using Fuzzy Logic
Lee Jang-Ho ; Kim You-Dan ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 3, 2004, Pages 140~148
Fault detection and isolation(FDI) and reconfigurable flight control system provide better survivability even though actuator faults occur. In this study, a new fault detection and isolation algorithm is proposed using fuzzy logic. When the FDI system detects the actuator fault, the fuzzy logic investigates the state variables to find which actuator has fault. Proposed fuzzy detection algorithm detect not only a single fault but also multiple faults. After detecting the fault, the reconfigurable flight control system begins operating for compensating the effects of the fault. A numerical simulation using six degree-of-freedom nonlinear aircraft model is performed to verity the performance of the proposed fault detection and isolation scheme.
Vibration and Aeroelastic Characteristics of a T-tail Configuration Using Parallel Processing Technique
Kim Dong-Hyun ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 3, 2004, Pages 149~156
In this study, vibration and aeroelastic analyses of a T-tail have been conducted. The structural dynamic computations of the T-tail are performed using MSC/NASTRAN and CFD-based computational aeroelastic analysis method is used to investigate the complex flutter phenomena. The results for vibration and aeroelastic analyses in the frequency and time domains are presented. It is importantly shown that the modal coupling of the torsional mode of vertical-wing and the asymmetric bending mode of horizontal-wing parts can give sensitive effects for the flutter stability of T-tail configurations.
A Boundary Integral Method for Elastic Shallow Shell
Kim Jin Woo ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 3, 2004, Pages 157~164
This is a boundary integral formulation for elastic shallow shell structures subjected to both membrane and bending loads. Fundamental solutions for shell actions are determined from the plate solutions and, finally the corresponding kernel functions for shell BIEs can be constructed. It is illustrated by solving an example of uniform load of spherical cap.
Boundary Layer Analysis in a Hypersonic Flow Field
Sohn Chang-Hyun ; Choi Seung ; Moon Su-Yuon ; Kim Jae-Yung ; Lee Yul-Hwa ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 3, 2004, Pages 165~173
Matching inviscid and boundary layer methods are developed for analysis of hypersonic flow with thick boundary layer. The new equations match all the boundary layer properties with a variation in the inviscid solution near the edge, except for the normal velocity. Computational comparison are peformed for incompressible and compressible flows over a flat plate. Results from the present method are compared with Wavier-Stokes solutions. The present results are in good agreement with Wavier-Stokes solutions. They show that the new technique can provide improved predictions of heating rates and skin friction predictions for preliminary design of vehicles where shear layers and entropy layer swallowing are importantfor for preliminary design.
A Study on the Performance Improvement and Modeling of Generator for Small Gas Turbine Engine
Kim Insoo ; Yoon Hyunro ;
Journal of the Korea Institute of Military Science and Technology, volume 7, issue 3, 2004, Pages 174~183
In this paper, the performance improvement and modeling of small onboard generator were described. As the characteristics of the field coil which are a major parameters of generator were improved, the system bandwidth could be increased, therefore the generator could also be satisfied with fast characteristic loads. Established the brief control model of the generator, it could be possible to do the analysis of generator performance, and improve the operational stability of the generator system using the control model.