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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 16, Issue 6 - Dec 2013
Volume 16, Issue 5 - Oct 2013
Volume 16, Issue 4 - Aug 2013
Volume 16, Issue 3 - Jun 2013
Volume 16, Issue 2 - Apr 2013
Volume 16, Issue 1 - Feb 2013
Selecting the target year
A Terrain Analysis System for Global Path Planning of Unmanned Ground Vehicle
Park, Won-Ik ; Lee, Ho-Joo ; Kim, Do-Jong ;
Journal of the Korea Institute of Military Science and Technology, volume 16, issue 5, 2013, Pages 583~589
DOI : 10.9766/KIMST.2013.16.5.583
In this paper, we proposed a system that efficiently provides support maps which includes the grid based terrain analysis information. To do this, we use the FDB which is defined as a GIS database that contains features with attributes attached to the features. The FDB is composed of a number of features and feature classes. In order to create support maps, it is necessary to classify feature classes that are associated with each support map and to search them in a grid map. The proposed system use a ontology model to classify semantically feature classes and the quad-tree data structure to find them in a grid map quickly. Therefore, our system is expected to be utilized for global path planning of UGV. In this paper, we show the possibility through an experimental implementation.
An Effectiveness Analysis of Anti-Ballisitic Missile Launcher Arrangement for the Lower Tier Defense against the Ballistic Missile
Kwon, Hyuck-Hoon ; Lee, Bum-Seok ; Kim, Yoon-Hwan ; Choi, Kwan-Bum ;
Journal of the Korea Institute of Military Science and Technology, volume 16, issue 5, 2013, Pages 590~597
DOI : 10.9766/KIMST.2013.16.5.590
For a lower tier defense, the distance between a launcher and an engagement control station is quite important to estimate the proper defense area and to effectively arrange missile launchers. In this paper, we have analyzed an effectiveness of anti-ballistic missile launcher arrangement for the lower tier defense against the ballistic missile. The operation concept, specific configuration and aerodynamic characteristics of the ballistic missile such as SCUD-B/C, Nodong are considered in order to develop a realistic engagement simulation. The diverse engagement results through numerical simulations are provided to conduct the effectiveness analysis of anti-ballistic missiles.
A Study on the Hidden Type Separation Device for Missile Umbilical Connector
Ahn, Soo-Hong ;
Journal of the Korea Institute of Military Science and Technology, volume 16, issue 5, 2013, Pages 598~606
DOI : 10.9766/KIMST.2013.16.5.598
After the missile is launched, the umbilical connector should be separated from it without any physical interference. The umbilical separation device, for this purpose, was developed by means of new concept. Using the investigation of various methods to separate the umbilical connector, a suitable method was selected and a corresponding device was designed and manufactured. To ensure the performance of the developed device, numerical analysis and performance test were conducted and correction was followed. The umbilical separation device was applied to real system operation test and its operation performance was tested. In consequence, several problems were founded, however, good results were generally obtained.
Effect of the Flow Actuator on the Asymmetric Vortex at High Angle of Attack
Lee, Eunseok ; Lee, Jin Ik ; Lee, Kwang Seop ;
Journal of the Korea Institute of Military Science and Technology, volume 16, issue 5, 2013, Pages 607~612
DOI : 10.9766/KIMST.2013.16.5.607
The effect of the flow actuator on the asymmetric vortex structure around the ogive-cylinder body with fineness ratio of 4 flying at the speed of Mach 0.1 at angle of attack of 50 degree is studied. The ogive-cylinder model is developed with the actuator placed near the nose tip and numerically simulated using the in-house CFD code named KFLOW. The numerical simulation employs two different actuator modeling: one is the boundary condition given by blowing normal to the surface and another shearing on the surface. The numerical simulation reveals that response of the vortex structure to the actuation is dependent on the type of modeling as well as the strength and direction of the actuation.
A Direction Finding Proximity Fuze Sensor for Anti-air Missiles
Choi, Jae-Hyun ; Lee, Seok-Woo ; An, Ji-Yeon ; Yeom, Kyung-Whan ;
Journal of the Korea Institute of Military Science and Technology, volume 16, issue 5, 2013, Pages 613~621
DOI : 10.9766/KIMST.2013.16.5.613
This paper presents the direction finding proximity fuze sensor using the clutter rejection method and the adaptive target detection algorithm for anti-air missiles. To remove effects by clutter and detect a target accurately, the clutter rejection method of Legendre sequence with BPSK(Bi phase Shift Keying) modulation has been proposed and the Doppler signal which has cross correlation characteristics is obtained from reflected target signals. Considering the change of the Doppler signal, the adaptive target detection algorithm has been developed and the direction finding algorithm has been fulfilled by comparing received powers from adjacent three receiving antennas. The encounter simulation test apparatus was made to collect and analyze reflected signal and test results showed that the -10 dBsm target was detected over 10 meters and the target with mesh clutter was detected and direction was distinguished definitely.
Trends Analysis on Marine/Naval/Underwater Military Science and Technology by Keywords Analysis
Kim, Mi-Ra ;
Journal of the Korea Institute of Military Science and Technology, volume 16, issue 5, 2013, Pages 622~630
DOI : 10.9766/KIMST.2013.16.5.622
The purpose of this study is to investigate trends of characteristics and changes in the field of marine/naval/underwater military science and technology in Korea. This study analyzed the keywords that appeared in marine/naval/underwater section of the "Journal of the Korean Military Science and Technology" during the period, 1998~2012. One hundred and seven articles were analyzed by keywords in English. Four hundred and fifty four keywords in English were analyzed by appearance frequency. Finally those results of source literatures and keywords were compared with each other and a better direction for the future of the field with further studies was suggested.
A study on Application of Probabilistic Fatigue Life Prediction for Aircraft Structures using the PoF based on Bayesian Approach
Kim, Keun Won ; Shin, Dae Han ; Choi, Joo-Ho ; Shin, Ki-Su ;
Journal of the Korea Institute of Military Science and Technology, volume 16, issue 5, 2013, Pages 631~638
DOI : 10.9766/KIMST.2013.16.5.631
The probabilistic fatigue life analysis is one of the common methods to account the uncertainty of parameters on the structural failure. Frequently, the Bayesian approach has been demonstrated as a proper method to show the uncertainty of parameters. In this work, the application of probabilistic fatigue life prediction method for the aircraft structure was studied. This effort was conducted by using the PoF(Probability of Failure) based on Bayesian approach. Furthermore, numerical example was carried out to confirm the validation of the suggested approach. In conclusion, it was shown that the Bayesian approach can calculate the probabilistic fatigue lives and the quantitative value of PoF effectively for the aircraft structural component. Moreover the calculated probabilistic fatigue lives can be utilized to determine the optimized inspection period of aircraft structures.
A Study on the Storage Life Estimation Method for Decrease of Muzzle Velocity using Gamma Process Model
Park, Sung-Ho ; Kim, Jae-Hoon ;
Journal of the Korea Institute of Military Science and Technology, volume 16, issue 5, 2013, Pages 639~645
DOI : 10.9766/KIMST.2013.16.5.639
The aim of the study is to investigate the method to estimate a storage life of propelling charge on the decrease of muzzle velocity by stochastic gamma process model. It is required to establish criterion for state failure to estimate the storage life and it is defined in this paper as a muzzle velocity difference between reference value and maximum allowable standard deviation multiplied by 6. The relationship between storage time and muzzle velocity is investigated by nonlinear regression analysis. The stochastic gamma process model is used to estimated the state distribution and the life distribution for storage time for 155mm propelling charge KM4A2 because the regression analysis is a deterministic method and it can't describe the distribution of life for storage time.
A Study of Test Method for Position Reporting Accuracy of Airborne Camera
Song, Dae-Buem ; Yoon, Yong-Eun ;
Journal of the Korea Institute of Military Science and Technology, volume 16, issue 5, 2013, Pages 646~652
DOI : 10.9766/KIMST.2013.16.5.646
PRA(Position Reporting Accuracy) for EO/IR(Electro-Optic/Infrared) airborne camera is an important factor in geo-pointing accuracy. Generally, rate table is used to measure PRA of gimbal actuated camera like EO/IR. However, it is not always possible to fix an EUT(Equipment for Under Test) to rate table due to capacity limit of the table on the size and weight of the object(EUT). Our EO/IR is too big and heavy to emplace on it. Therefore, we propose a new verification method of PRA for airborne camera and assess the validity of our proposition. In this method we use collimator, angle measuring instrument, 6 dof motion simulator, optical surface plate, leveling laser, inclinometer and poster(for alignment).
Structural Integrity Evaluation for Crane Bracket of Armored Recovery Vehicle
Jung, Jae-Woong ; Jung, Un-Hwa ; Kim, Cheon-Soo ; Yu, Young-Soo ; Park, Kyung-Chul ; Park, Ki-Chul ;
Journal of the Korea Institute of Military Science and Technology, volume 16, issue 5, 2013, Pages 653~658
DOI : 10.9766/KIMST.2013.16.5.653
For towing the new type armored vehicle and maintaining the close support, the armored recovery vehicle(ARV) with winch and crane has been developed. In case of crane, it is mainly used to salvage heavy objects by rotational and vertical motion. Especially, the crane bracket is very important parts due to fixing the ARV's body and rotary joint and preventing the force rotation of crane. Therefore, the crane bracket needs to have an enough strength to endure the high load and it is very important to analyze the stress distribution under loads. In the present work, the experimental and analytical investigation on structural integrity evaluation of crane bracket were carried out. The simulation of three-dimensional finite element method(FEM) was compared with experimental datum. From the numerical results, the FEM simulations corresponded well with th experimental results and the structural safety was confirmed by safety factor.
Performance Improvement of IPCS : A Middleware for Warship Combat Systems
Ryu, Won-Jae ; Shin, Soo-Young ; Heo, Seong-Gil ; Choi, Yoon-Seok ;
Journal of the Korea Institute of Military Science and Technology, volume 16, issue 5, 2013, Pages 659~665
DOI : 10.9766/KIMST.2013.16.5.659
IPCS(Inter Process Communication Service) is a real-time communication middleware designed for warship combat battle systems based on publisher-subscriber communication model. Because IPCS was originally designed to operated under 100 Mbps network environment, increasing network speed into Gigabit environment does not linearly increase the throughput of IPCS. To solve this problem, we anaylized IPCS structure and optimized IPCS into Gigabit-Ethernet environment. We found parameters to improve IPCS based on UDP and Token-ring structure. By improving, IPCS has reliability and higher throughput than TCP although IPCS is based on UDP.
Implementation of Network Level Simulator for Tactical Network Performance Analysis
Choi, Jeong-In ; Shin, Sang-Heon ; Baek, Hae-Hyeon ; Park, Min-Ho ;
Journal of the Korea Institute of Military Science and Technology, volume 16, issue 5, 2013, Pages 666~674
DOI : 10.9766/KIMST.2013.16.5.666
This paper studied about the design and implementation of tactical communication network simulator in order to obtain tactical communication network parameter, such as link capacity and routing plan, and a number of exceptional cases that may occur during actual deployment by conducting simulation of a large-scale tactical communication networks. This tactical communication network simulator provides equipment models and link models of commercial OPNET simulator for tactical communication network. In addition, 6 types of simulation scenario writings convenience functions and traffic generation models that may occur in situations of tactical communication network environment were implemented in order to enhance user friendliness. By taking advantages of SITL(System-In-The-Loop) function of OPNET, the tactical communication network simulator allows users to perform interoperability test between M&S models and actual equipment in operating simulation of tactical communication network, which is run on software. In order to confirm the functions and performance of the simulator, small-scale of tactical communication network was configured to make sure interoperability between SITL-based equipment and a large-scale tactical communication network was simulated and checked how to cope with traffic generated for each network node. As the results, we were able to confirm that the simulator is operated properly.
A Reliability Prediction Method for Weapon Systems using Support Vector Regression
Na, Il-Yong ;
Journal of the Korea Institute of Military Science and Technology, volume 16, issue 5, 2013, Pages 675~682
DOI : 10.9766/KIMST.2013.16.5.675
Reliability analysis and prediction of next failure time is critical to sustain weapon systems, concerning scheduled maintenance, spare parts replacement and maintenance interventions, etc. Since 1981, many methodology derived from various probabilistic and statistical theories has been suggested to do that activity. Nowadays, many A.I. tools have been used to support these predictions. Support Vector Regression(SVR) is a nonlinear regression technique extended from support vector machine. SVR can fit data flexibly and it has a wide variety of applications. This paper utilizes SVM and SVR with combining time series to predict the next failure time based on historical failure data. A numerical case using failure data from the military equipment is presented to demonstrate the performance of the proposed approach. Finally, the proposed approach is proved meaningful to predict next failure point and to estimate instantaneous failure rate and MTBF.
Recommendations on Design and Analysis of Protective Structures
Krauthammer, Theodor ; Park, Jong Yil ;
Journal of the Korea Institute of Military Science and Technology, volume 16, issue 5, 2013, Pages 683~689
DOI : 10.9766/KIMST.2013.16.5.683
Defending society against rapidly evolving types of warfare, such as asymmetric warfare, will remain a challenge, at least through the first half of the 21st century. Technology will continue to play a major role in these efforts, and society must develop appropriate innovative theoretical, numerical, and experimental approaches that will lead to a wide range of solutions. This paper is aimed at highlighting challenges that must be overcome to achieve the required objectives.
Review : Ionic Liquids as Green Solvent
Lee, Junwung ;
Journal of the Korea Institute of Military Science and Technology, volume 16, issue 5, 2013, Pages 690~702
DOI : 10.9766/KIMST.2013.16.5.690
Ionic liquids(ILs) have been the most investigated chemicals among green solvents including water, glycerol, supercritical carbon dioxdie(
). ILs are attracting organic as well as inorganic chemicals because most ionic liquids' vapor pressures are very low so that ILs are liquids phase at ambient conditions. ILs are composed of various anions and cations, thus chemists can design functionalized solvents and/or catalysts that can be used in specific synthetic reactions by means of combinations of different ions. Many scientists believe ILs being green materials because of its low vapor pressure as well as the flexibility in controlling the chemical and physical properties. In this review the author describes recent development of ILs focused on imidazolium and pyridinium ILs which are being most investigated presently. In order to apply this materials in industrial level, the toxicity matter must be resolved first. In this regard, the author describes recent research trend regarding environmental effects by ILs as well as some meaningful results as well.
Induction Voltage Adder for High Power Pulse Generator
Yang, Jong-Won ; Shin, Jin-Woo ; Ryu, Han-Young ; Heo, Hoon ; Lee, Woo-Sang ; Kim, Chang-Gu ; Nam, Sang Hoon ; So, Joon-Ho ;
Journal of the Korea Institute of Military Science and Technology, volume 16, issue 5, 2013, Pages 703~711
DOI : 10.9766/KIMST.2013.16.5.703
In this paper, we have proposed high power generator with Induction Voltage Adder of three cells. IVA which has n cells can generate n-th times high power pulse, is a more stable system than Marx generator in the view of breakdown. We applied amorphous metal magnetic cores as an energy storing material for IVA rather than ferrite cores because of their higher magnetic flux swing to make it more compact system and the loss of it was also considered in the design. For driving the IVA, we design Blumlein pulse generators which are filled with pure water for high dielectric constant and high breakdown field strength, and triggered by single Marx generator. We have presented the PSPICE simulation and its test result.
Design Study on the Flow Characteristics of a Gas Management System for a Vertical Launching System
Yang, Young-Rok ;
Journal of the Korea Institute of Military Science and Technology, volume 16, issue 5, 2013, Pages 712~717
DOI : 10.9766/KIMST.2013.16.5.712
The gas management system for a vertical launching system must be safely managed within a ship. The plenum and uptake are capable of containing and surviving a full-burning restrained firing without loss of gas management integrity. To secure the safety, the pressure characteristics with a supersonic under-expanded jet on a gas management system are numerically investigated using computational fluid dynamics. The results of present analysis and the preliminary design of the gas management system are described in this paper.