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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 17, Issue 6 - Dec 2014
Volume 17, Issue 5 - Oct 2014
Volume 17, Issue 4 - Aug 2014
Volume 17, Issue 3 - Jun 2014
Volume 17, Issue 2 - Apr 2014
Volume 17, Issue 1 - Feb 2014
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A Study on Optimization of Components Sizing for 4×4 Series Hybrid Electric Propulsion Systems
Jang, Myeong-Eon ; Jeong, Soon-Kyu ; Han, Kyu-Hong ; Yeo, Seung-Tai ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 2, 2014, Pages 159~166
DOI : 10.9766/KIMST.2014.17.2.159
The study is conducted on the subject of optimization of components sizing for series hybrid electric propulsion systems. The components sizing of series type hybrid system is very important because each component of series type is larger than the corresponding component of the parallel type or series-parallel type. If the components sizing is greater or less than what is required to this system, the performance of the system is getting worse. The methodology for the sizing of a driving motor is introduced based on the foundation of determined system configuration and performance target. And the sizing of an engine/generator and a battery is achieved based on simulation results using Dynamic Programming. It is possible to find the optimal sizing of these components by comparing fuel efficiency of hybrid electric propulsion system for 8 driving cycles.
Task Allocation Framework Incorporated with Effective Resource Management for Robot Team in Search and Attack Mission
Kim, Min-Hyuk ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 2, 2014, Pages 167~174
DOI : 10.9766/KIMST.2014.17.2.167
In this paper, we address a task allocation problem for a robot team that performs a search and attack mission. The robots are limited in sensing and communication capabilities, and carry different types of resources that are used to attack a target. The environment is uncertain and dynamic where no prior information about targets is given and dynamic events unpredictably happen. The goal of robot team is to collect total utilities as much as possible by destroying targets in a mission horizon. To solve the problem, we propose a distributed task allocation framework incorporated with effective resource management based on resource welfare. The framework we propose enables the robot team to retain more robots available by balancing resources among robots, and respond smoothly to dynamic events, which results in system performance improvement.
Clutter Rejection Method using Background Adaptive Threshold Map
Kim, Jieun ; Yang, Yu Kyung ; Lee, Boo Hwan ; Kim, Yeon Soo ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 2, 2014, Pages 175~181
DOI : 10.9766/KIMST.2014.17.2.175
In this paper, we propose a robust clutter pre-thresholding method using background adaptive Threshold Map for the clutter rejection in the complex coastal environment. The proposed algorithm is composed of the use of Threshold Map`s and method of its calculation. Additionally we also suggest an automatic decision method of Thresold Map`s update. Experimental results on some sets of real infrared image sequence show that the proposed method could remove clutters effectively without any loss of detection rate for the aim target and reduce processing time dramatically.
Enhancement of Source Localization Performance using PMP Method in a Multipath Environment
Lee, Ho Jin ; Yoon, Kyung Sik ; Shin, Dong Hoon ; Lee, Kyun Kyung ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 2, 2014, Pages 182~188
DOI : 10.9766/KIMST.2014.17.2.182
Source localization is an important problem in the field of sonar and radar, etc. For the purpose of source localization, two or more spatially separated sensors are often used to measure the time difference of arrivals of a radiating source whose transmitted signal waveform is unknown. The NLS(Nonlinear Least Square) cost function with curve fitting method was proposed recently, which provide robust source localization performance by reducing estimation ambiguity. However, even this algorithm shows degraded performance in a multipath environment. To estimates source localization correctly, source localization algorithm that eliminate the effect of multipath signals is required. In this paper, PMP(Power Matching Procedure) is added to the algorithm, which provides improved source localization performance by properly cutting out the effect of multipath signals. Through simulation the performance of the proposed source localization algorithm is verified.
Conceptual Design of Fighter-class Aircraft Using Integrated Commercial Tools
Lee, Sung-Jin ; Nam, Hwa Jin ; Park, Young Keun ; O, Jangwhan ; Lee, Dae Yearl ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 2, 2014, Pages 189~196
DOI : 10.9766/KIMST.2014.17.2.189
Automated design program using commercial process integration and optimization program was developed for conceptual design of fighter-class aircraft. Wind tunnel test data and performance analysis results were compared for the verification of analysis tool of this program, and the usefulness of the tool was found. After integration with radar cross section analysis tool, the correlation with configuration design variables of wing, tail and performance parameters was identified by design of experiment, and the optimized configuration for weight and RCS was derived from optimization of empty weight and average frontal RCS value. After parameter definition of fuselage, the program can be implemented for full aircraft configuration.
An Investigation of Radiation Heat Transfer on The Horizontal Fin of An External Fuel Tank by Flame of a Flying Flare
Jung, Daehan ; Kang, Chihang ; Kim, Sitae ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 2, 2014, Pages 197~203
DOI : 10.9766/KIMST.2014.17.2.197
In this paper, the effect of unsteady radiation on the horizontal fin of an external fuel tank by flame of a flying flare was analysed to see the temperature increase of the fin and the thermal impact on the fin. Radiation between two surfaces was calculated using the concept of radiation resistance of surface and space including radiation, irradiation and shape factor for two flying trajectories of a flare, maximum temperature of 2200 K, emissivity of 0.95, flying velocity of 30 m/s, and thermal surface area of
. The result shows that the temperature increase of the fin is 0.236 K, and the thermal effect on the fin is ignorable. And it was found that temperature is increased a little because small amount of heat energy can be radiated due to the short exposure time to the heat source.
Effects of Calibration Rounds on the Statistical Distribution of Muzzle Velocity in Acceptance Test of Propelling Charge
Park, Sung-Ho ; Kim, Jae-Hoon ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 2, 2014, Pages 204~212
DOI : 10.9766/KIMST.2014.17.2.204
The purpose of this paper is to investigate the effects of calibration rounds on the statistical distribution of the muzzle velocity in acceptance test of propelling charge. It is shown that the normal distribution fits best among statistical distributions from goodness-of fit test. The 3p-Weibull distribution is also acceptable because the shape of the probability density function curve is similar to that of normal distribution and it also has near zero skewness value. Muzzle velocities of test rounds uncompensated by calibration rounds showed high variation and had comparatively higher skewness. Because the skewness of normal distribution is defined to be zero, calibration rounds make the normality of data higher.
Research on the Effects of MAAB Style Guidelines for Weapon System Embedded Software Reliability Improvement
Kim, Yeon-Gyun ; Yoon, Hyung-Sik ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 2, 2014, Pages 213~222
DOI : 10.9766/KIMST.2014.17.2.213
In this paper, we introduce that MAAB style guideline has effects on the codes generated from Simulink models for static and dynamic software testing, when weapon system embedded software design and implementation are performed using the model based method. As showing the effects, MAAB guideline is helpful for defect prevention related with coding rules and run time errors associated with the DAPA weapon system embedded software guide. Thus, we check related items between MAAB and DAPA software reliability testing including static and dynamic analysis. And then we propose the criterion to select proper items from MAAB for DAPA guideline and show how to verify the relationship and the effects on reliability of models in Simulink. In addition, we show the needs for clear logics in conditional block models or statements and simple complexity models for Simulink model based design.
Combat Entity Based Modeling Methodology to Enable Joint Analysis of Performance/Engagement Effectiveness - Part 1 : Conceptual Model Design
Seo, Kyung-Min ; Kim, Tag Gon ; Song, Hae-Sang ; Kim, Jung Hoon ; Chung, Suk Moon ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 2, 2014, Pages 223~234
DOI : 10.9766/KIMST.2014.17.2.223
This paper proposes a flexible and highly reusable modeling methodology for a next-generation combat entity which enables joint analysis of performance/engagement effectiveness. According to the scope of the proposed work, the paper is divided into two parts; Part 1 focuses on a conceptual model design, whereas Part 2 proposes detailed model specification and implementation. In Part 1, we, first, classify the combat entity model as combat logic and battlefield function sub-models for joint analysis. Based on the sub-models, we propose two dimensional model partition method, which creates six groups of a single combat entity model by two dimensions: three-activity and two-abstraction. This grouping enables us to reconfigure the combat entity model by sharing the same interface within the group, and the same interface becomes the fundamental basis of the flexible model composition. Furthermore, the proposed method provides a model structure that effectively reflects the real world and maximizes the multi-level reusability of a combat entity model. As a case study, we construct a model design for anti-surface ship warfare. The case study proves enhancement of model reusability in the process of scenario expansion from pattern running to wire guided torpedo operations.
Combat Entity Based Modeling Methodology to Enable Joint Analysis of Performance/Engagement Effectiveness - Part 2 : Detailed Model Design ＆ Model Implementation
Seo, Kyung-Min ; Choi, Changbeom ; Kim, Tag Gon ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 2, 2014, Pages 235~247
DOI : 10.9766/KIMST.2014.17.2.235
Based on two dimensional model partition method proposed in Part 1, Part 2 provides detailed model specification and implementation. To mathematically delineate a model`s behaviors and interactions among them, we extend the DEVS (Discrete Event Systems Specification) formalism and newly propose CE-DEVS (Combat Entity-DEVS) for an upper abstraction sub-model of a combat entity model. The proposed CE-DEVS additionally define two sets and one function to reflect essential semantics for the model`s behaviors explicitly. These definitions enable us to understand and represent the model`s behaviors easily since they eliminate differences of meaning between real-world expressions and model specifications. For model implementation, upper abstraction sub-models are implemented with DEVSim++, while the lower sub-models are realized using the C++ language. With the use of overall modeling techniques proposed in Part 1 and 2, we can conduct constructive simulation and assess factors about combat logics as well as battle field functions of the next-generation combat entity, minimizing additional modeling efforts. From the anti-torpedo warfare experiment, we can gain interesting experimental results regarding engagement situations employing developing weapons and their tactics. Finally, we expect that this work will serve an immediate application for various engagement warfare.
Study on the Optimal Location of Low Altitude Air Defense Radar
Baek, Kyung-Hyoek ; Lee, Youngwoo ; Jang, Hoon ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 2, 2014, Pages 248~257
DOI : 10.9766/KIMST.2014.17.2.248
As observed in the recent war, suppression of enemy air defense operation is one of the major tactics, simultaneously conducted with high payoff target. Specifically, our air defense operation should be properly constructed, since the operating environment of our forces mostly consists with mountainous terrain, which makes detections of the enemy difficult. The effective arrangements of low altitude air defense radars can be suggested as a way of improving the detection capability of our forces. In this paper, we consider the location problem of low altitude air defense radar, and formulate it as an Integer Programming. Specifically, we surveyed the previous researches on facility location problems and applied two particularly relevant models(MCLP, MEXCLP) to our problem. The terrain factor was represented as demand points in the models. We verified the optimal radar locations for operational situations through simulation model which depicts simple battle field. In the simulation model, the performance of optimal radar locations are measured by the enemy detection rate. With a series of experiments, we may conclude that when locating low altitude air defense radars, it is important to consider the detection probability of radar. We expect that this finding may be helpful to make a more effective air defense plan.
A Study on Characteristics of Sampling Flow and Pressure Conditions for Chemical Detection Optimization
Son, In-Sung ; Yoon, Soon-Min ; Kim, Hak-Sin ; Yuk, Young-Ho ; Park, ByeongHwang ; Kim, JuHyun ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 2, 2014, Pages 258~264
DOI : 10.9766/KIMST.2014.17.2.258
In terms of chemical detection performance related with chemical material sampling, this investigation shows optimized values, resulted from minimizing loss from air turbulence and other reasons when pressure changes on the basis of sampling flow rate Based on simulations and pressure control of the outside conditions it became possible to obtain ion mobility detection optimum values, and to derive standard pressure conditions that is appropriate for DMS characteristic.
An Analysis Study about Relationship between Ballistic Coefficient and Accuracy of Predicted Intercept Point of Super-High Speed Targets
Lee, Dong-Gwan ; Cho, Kil-Seok ; Shin, Jin-Hwa ; Kim, Ji-Eun ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 2, 2014, Pages 265~274
DOI : 10.9766/KIMST.2014.17.2.265
A recent air defense missile system(ADMS) is required to have a capability to intercept super-high speed targets such as tactical ballistic missiles(TBMs) by performing engagement control efficiently. The air defense missile system should be ready to engage the TBMs as soon as the ADMS detects TBMs because falling velocity of TBM is very high and remaining time interval to engage TBM is very short. As a result, the ADMS has to predict the trajectories of TBMs accurately with estimated states of dynamics to generate predicted intercept point(PIP). In addition, it is needed to engage TBMs accurately via transmitting the obtained PIP data to the corresponding intercept missiles. In this paper, an analysis about the relationship between ballistic coefficient and PIP accuracy which is depending on geodetic height of the first detection of TBM is included and an issue about effective engagement control for the TBM is considered.
The Study on Assessment of Protective Capacity of the Reinforced Concrete Box-type Artillery Positions
Baek, Jonghyuk ; Kim, Suk Bong ; Son, Kiyoung ; Park, Young Jun ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 2, 2014, Pages 275~281
DOI : 10.9766/KIMST.2014.17.2.275
Although self-propelled artilleries are mobile equipment, they need their own covered-positions for survival against preemptive strikes. The most important military requirement is enough protective capacity against blast pressure caused by explosion. This paper aims to assess the protective capacity of the newly-placed concrete box-type artillery positions using accurate structural geometric models as well as soil-structure interaction analysis. The commercial program is used to model the structural geometry of the positions. In order to describe the correct wave propagation in the backfill along with soil-structure interaction, used parameters in shock equation of state are selected based on the related studies as well as theories and then their final results are verified with the ones calculated with empirical equations in the US Unified Facility Criteria. In sum, it could be concluded that the protective capacity of the newly-built positions satisfies the protective structural requirement.
Synthesis of 2,6-Diamino-4-Nitrotoluene using Gas Chromatography Monitoring in the Reduction of Trinitrotoulene
Kim, Hyoung-Sug ; Yu, Jae Chul ; Kim, Ho Gi ; Kim, Sae Rom ; Choi, Keun Bae ; Jung, Won Bok ; Seo, Won Jun ; Kim, Jin-Seuk ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 2, 2014, Pages 282~288
DOI : 10.9766/KIMST.2014.17.2.282
In this research, we investigated synthetic method of 2,6-DANT that can be used as a chain extender of urethane/urea and epoxy materials in a demilitarization method via chemical transformations considering environmental, economical aspects and stability of process. We was able to identify through GC monitoring that 2,4-DANT and 2,6-DANT were produced when we inject `hydrazine monohydrate 3.3 eq. by TNT 1 eq.` with a fine metering pump for 30 minutes and then, reflux for an additional 2 hours. We was able to isolate only 2,6-DANT(99.3% purity and 45.0% yield) from mixture of 2,4-DANT and 2,6-DANT through the separating and refining methods using 2,6-DANT solubility in methanol and crystallinity of 2,6-DANT.