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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
Journal Basic Information
Journal DOI :
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
Selecting the target year
Unit Mission Based Mission Planning and Automatic Mission Management for Robots
Lee, Ho-Joo ; Park, Won-Ik ; Kim, Do-Jong ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 1, 2014, Pages 1~7
DOI : 10.9766/KIMST.2014.17.1.001
In this paper, it is suggested a method of mission planning and management for robots based on the unit mission. In order to make robots execute given missions continuously as time goes by, a new concept for planning the mission which is composed of one or more unit missions and an automatic mission management scheme are developed. For managing robot`s missions in real time, six management methods are devised as well in order to cope with the mismatches, which occur frequently during the mission execution, as to the initial plan. Without the operator`s involvement, any mismatch can be adjusted automatically by applying one of the mission management methods. The suggested concept of mission planning and mission management methods based on the unit mission are partially realized in the Dog-Horse robot system and it is checked that it can be a viable one for developing effective robot operation systems.
Passive Remote Chemical Detection of SF
Clouds in the Atmosphere by FTIR
Chong, Eugene ; Park, Byeonghwang ; Kim, Ju Hyun ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 1, 2014, Pages 8~14
DOI : 10.9766/KIMST.2014.17.1.008
Brightness temperature spectra acquired from FTIR(Fourier Transform Infrared)-SCADS (Standoff Chemical Agent Detection System) could be available for detection and identification of the chemical agents and pollutants from different background. IR spectrum range of 770 to 1350
is corresponding to "atmospheric window". A 2-dimensional(2D) brightness temperature spectrum was drawn from combining each data point through automatic continuous scanning of FTIR along with altitude and azimuth. At higher altitude, temperature of background was decreased but scattering effect of atmospheric gases was increased. Increase in temperature difference between background and blackbody in SCADS at higher temperature causes to increases in peak intensity of
. This approach shows us a possibility that 2D visual information is acquired from scanning data with a single FTIR-SCADS.
Study on Infrared Signature Variations of a Naval Ship Operated at sea Near Geoje-do Island
Kil, Tae-Jun ; Kim, Tae-Kuk ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 1, 2014, Pages 15~24
DOI : 10.9766/KIMST.2014.17.1.015
It is essential to understand the infrared signature of a naval ship to survive against various missile attacks under variable environmental conditions. As guided missiles are developing to equip more accurate IR seekers, research works for countermeasure and IR stealth technology are strongly required. But challenging works are continuously suggested for predicting and analyzing IR signal status of naval ships to achieve low observable performance under various weather conditions, variable missions and developing threats. In this study, overall guidelines of setting design criteria for low observable ships are proposed by considering varying environmental conditions including daily and seasonal variations. Test and evaluation criteria for newly constructed ships for target and background temperature difference is proposed as a design criteria which can be predicted by change of condition and ship`s speed. Through the proposed techniques and procedures, it is expected to establish the measurement and evaluation criteria by using temperature, IR Signal differences between the ship and the background.
Numerical Analysis of Supercavitating Flows Based on Viscous/Inviscid Method
Ahn, Byoung-Kwon ; Kim, Ji-Hye ; Choi, Jung-Kyu ; Kim, Hyoung-Tae ; Nah, Young-In ; Lee, Do-Hyung ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 1, 2014, Pages 25~32
DOI : 10.9766/KIMST.2014.17.1.025
Recently supercavitating torpedo has been studied because of its high-speed performance as the next generation of underwater weapon systems. In this study, we present a numerical method based on the potential flow. Characteristic features of the shape of supercavities and drag forces are investigated. In addition, we introduce a viscous-potential method to compensate for the effects of viscosity. The results are compared with viscous calculations using a commercial package, FLUENT V13.
Study on the UUV Operation via Conventional Submarine`s Torpedo Tube
Li, Ji-Hong ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 1, 2014, Pages 33~40
DOI : 10.9766/KIMST.2014.17.1.033
Due to its unmanned feature and some of being matured underwater technologies, UUV(Unmanned Undersea Vehicle) is increasingly considered as a utility player in today`s battle-field. The operational benefit of submarine-based UUV operation could be enormous yet the integration challenges are significant, particularly for most of small conventionally-powered submarines. In this paper, we consider UUV operational methodology via the conventional submarine`s torpedo tube. Two previous attempts having been done to retrieve the UUV through torpedo tube are reviewed, and their pros and cons are also analyzed. Then, an alternative option is proposed for UUV operation via torpedo tube. In addition, some of practical challenges are also discussed in the paper.
A Study on the Criteria to Decide the Number of Aircrafts Considering Operational Characteristics
Son, Young-Su ; Kim, Seong-Woo ; Yoon, Bong-Kyoo ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 1, 2014, Pages 41~49
DOI : 10.9766/KIMST.2014.17.1.041
In this paper, we consider a method to access the number of aircraft requirement which is a strategic variable in national security. This problem becomes more important considering the F-X and KF-X project in ROKAF. Traditionally, ATO(Air Tasking Order) and fighting power index have been used to evaluate the number of aircrafts required in ROKAF. However, those methods considers static aspect of aircraft requirement. This paper deals with a model to accommodate dynamic feature of aircraft requirement using absorbing Markov chain. In conclusion, we suggest a dynamic model to evaluate the number of aircrafts required with key decision variables such as destroying rate, failure rate and repair rate.
A Study on Ku-band Antenna for Mounting on UAV
Park, Jin-Woo ; Ryu, Ji-Ho ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 1, 2014, Pages 50~56
DOI : 10.9766/KIMST.2014.17.1.050
In this paper, we proposed a Ku-band antenna that can be mounted on UAV. A proposed antenna structure has small size and light weight. It is considered long distance communication environment(LOS) and equipped UAV. Proposed antenna is designed
aperture coupled microstrip patch array antenna for high gain characteristics. In the measurement results, VSWR is less than 1.5 and the gain is over 21dBi in the bandwidth. Mechanical specifications of antenna assembly are
of size and 3kg of weight.
A Wide Band Antenna Design using the Synthesis of Independent Dual Resonance Modes for Manpack SDR(Software Defined Radio)
Yu, Byunggil ; Dong, Moo-Ho ; Cho, Ji-Haeng ; Han, Sung-Woo ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 1, 2014, Pages 57~63
DOI : 10.9766/KIMST.2014.17.1.057
In this paper, we have proposed a wide band antenna for manpack SDR(Software Defined Radio). The proposed antenna consists of feeding post, flexible gooseneck and two radiating elements composed of a upper and lower radiators. The upper radiator has a longer electrical length than the lower radiator in order to operate in the lower frequency. Also, the resonant frequency and impedance characteristics of the antenna can be adjusted independently for two radiators. Therefore, the proposed antenna can be achieved wide impedance bandwidth by the combination of two independent resonance modes. To analyze the characteristics of the antenna in the design process is employed the equivalent circuit theory and EM(Electro-Magnetic) simulation. The measurement results show that the proposed antenna have the sufficient wide bandwidth, above -3.4dBi of the gain and fairly good radiation pattern over the wide bandwidth.
A Study on Development of Evaluation Provisions for Selection of Development Companies for National Defense ACTD Programs
Kim, Kitaek ; Park, Young Jun ; Shim, Sangryul ; Son, Kiyoung ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 1, 2014, Pages 64~70
DOI : 10.9766/KIMST.2014.17.1.064
So far, the existing guideline called "Proposal Evaluation and Negotiation Guidelines for Weapon Systems (PE&NG)" has been employed even when choosing a development firm for the newly-adapted defense acquisition system, "Advanced Concept Technology Development(ACTD)". However, in that PE&NG ignores distinctive characteristics associated with ACTD programs, it is inappropriate. This study aims to propose an appropriate evaluation index which could be used to select the most suitable development company for the successful ACTD project. For this, Delphi techniques were used to collect extensive opinions of the hands-on workers. These opinion were consistently given but never gathered previously. The newly proposed index has a similar direction and range to the existing ones with its contents a little modified and simplified. Yet, it is more capable of evaluating candidates` proposals.
Effectiveness Analysis of Chemical Warfare System through Interoperation between Engineering Level and Engagement Level Models : Methodology and Environment
Seok, Moon-Gi ; Song, Hae-Sang ; Kim, Tag-Gon ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 1, 2014, Pages 71~81
DOI : 10.9766/KIMST.2014.17.1.071
It is an important issue to evaluate the effectiveness of chemical warfare through modeling and simulation(M&S) technology. In this paper, we propose the M&S methodology and environment for the chemical warfare for effectiveness analysis. In detail, for modeling perspective, we propose three fundamental component models according to their behaviors, which are a chemical weapon, a detecting device system, and an engaging unit system. Among proposed models, the chemical weapon and the detecting device system models are represented by engineering-level system models, whereas the engaging unit system model are described as an engagement-level system model. For simulation perspective, we apply a hybrid simulation environment using High Level Architecture (HLA) to interoperate with the proposed engineering and engagement-level models. The proposed M&S methodology and environment enables to evaluate the effectiveness of the chemical warfare system considering the doctrines, the performance of device or weapon, and weather factors. To verify the efficiency of the proposed methodology and environment, we experimented three categorized case studies, which are related with those considering factors.
Study of Damage in Germanium Optical Window Irradiated by a Near-infrared Continuous Wave Laser
Lee, Kwang Hyun ; Shin, Wan-Soon ; Kang, Eung-Cheol ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 1, 2014, Pages 82~89
DOI : 10.9766/KIMST.2014.17.1.082
The damage in germanium (Ge) optical window irradiated by a near-infrared continuous wave (CW) laser was studied. Laser-induced heating and melting process were surveyed, and the specific laser power and the irradiance time to melt were estimated by numerical simulation. The experiments were also carried out to investigate the macro and micro structure change on Ge window. Results showed that the surface deformation was formed by melting and resolidification process, the damaged surface had a polycrystalline phase, and the transmittance as an optical performance factor in mid-infrared region was decreased. We confirmed that an abnormal polycrystalline phase and surface deformation effect such as hillock formation and roughness increase reduced the transmittance of Ge window and were the damage mechanism of CW laser induced damage on Ge window.
System Design and Performance Analysis of 3D Imaging Laser Radar for the Mapping Purpose
La, Jongpil ; Ko, Jinsin ; Lee, Changjae ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 1, 2014, Pages 90~95
DOI : 10.9766/KIMST.2014.17.1.090
The system design and the system performance analysis of 3D imaging laser radar system for the mapping purpose is addressed in this article. For the mapping, a push-bloom scanning method is utilized. The pulsed fiber laser with high pulse energy and high pulse repetition rate is used for the light source of laser radar system. The high sensitive linear mode InGaAs avalanche photo-diode is used for the laser receiver module. The time-of-flight of laser pulse from the laser to the receiver is calculated by using high speed FPGA based signal processing board. To reduce the walk error of laser pulse regardless of the intensity differences between pulses, the time of flight is measured from peak to peak of laser pulses. To get 3D image with a single pixel detector, Risley scanner which stirs the laser beam in an ellipsoidal pattern is used. The system laser energy budget characteristics is modeled using LADAR equation, from which the system performances such as the pulse detection probability, false alarm and etc. are analyzed and predicted. The test results of the system performances are acquired and compared with the predicted system performance. According to test results, all the system requirements are satisfied. The 3D image which was acquired by using the laser radar system is also presented in this article.
Study on Tactical Target Tracking Performance Using Unscented Transform-based Filtering
Byun, Jaeuk ; Jung, Hyoyoung ; Lee, Saewoom ; Kim, Gi-Sung ; Kim, Kiseon ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 1, 2014, Pages 96~107
DOI : 10.9766/KIMST.2014.17.1.096
Tracking the tactical object is a fundamental affair in network-equipped modern warfare. Geodetic coordinate system based on longitude, latitude, and height is suitable to represent the location of tactical objects considering multi platform data fusion. The motion of tactical object described as a dynamic model requires an appropriate filtering to overcome the system and measurement noise in acquiring information from multiple sensors. This paper introduces the filter suitable for multi-sensor data fusion and tactical object tracking, particularly the unscented transform(UT) and its detail. The UT in Unscented Kalman Filter(UKF) uses a few samples to estimate nonlinear-propagated statistic parameters, and UT has better performance and complexity than the conventional linearization method. We show the effects of UT-based filtering via simulation considering practical tactical object tracking scenario.
Setting an Initial Validation Gate based on Signal Intensity for Target Tracking in IR Image Sequences
Yang, Yu Kyung ; Kim, Jieun ; Lee, Boohwan ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 1, 2014, Pages 108~114
DOI : 10.9766/KIMST.2014.17.1.108
This paper describes a method to set an intensity-based initial validation gate for tracking filter while preserves the ability of tracking a target with maximum speed. First, we collected real data set of signal versus distance of an airplane target. And at each data point, we computed maximum distance the target can move. And a function is modeled to expect the maximum moving pixels on the lateral direction based on the intensity of the detected target in IR image sequence. The initial prediction error covariance can be computed using this function to decide the size of the initial validation gate. The simulation results show the proposed method can set the appropriate initial validation gates to track the targets with the maximum speed.
Close Surface Targets Detection using Background Removal Integral Projection in Coastal Environment
Lee, Boohwan ; Kim, Jieun ; Yang, Yu Kyung ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 1, 2014, Pages 115~121
DOI : 10.9766/KIMST.2014.17.1.115
In this paper, we propose a robust background removal integral projection(BRIP) method which can detect close surface targets in coastal environment for IRST. Row pixels of background region from coastal infrared image show similar response. Thus, the proposed BRIP is calculated after horizontal and vertical background estimations and removals are performed sequentially. Finally, surface large targets can be detected using the results of the BRIP. Experimental results on a set of real infrared image sequence show that the proposed method could fully detect ships in every frame.
A Study on the Field of View of the Remote FTIR Chemical Imaging Detection System
Lee, Jong-Min ; Kang, Young-Il ; Kim, Ju-Hyun ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 1, 2014, Pages 122~128
DOI : 10.9766/KIMST.2014.17.1.122
Remote fourier transform infrared(FTIR) chemical imaging detection system allows detection and identification of gases in the atmosphere from long distances. In this paper, the appropriate field of view(FOV) of the FTIR imaging system was examined and the main performance of the system for the interferometer was described. For the determination of the FOV, simulations of gas dispersion range were performed with the NBC reporting and modeling software(NBC-RAMS) developed by ADD. As a result, minimum 192 mrad of FOV was required for the remote FTIR imaging system to visualize chemical warfare agents dispersed in several hundred meters. At the same time, 0.75 mrad of instantaneous field of view(IFOV) for a linear interferometer proper to take a FOV for the chemical agent imaging.
Facile Fabrication of Chemical Vapor Samplers with Various Adsorbents for Man-in-Simulant Test(MIST)
Jung, Hyunsook ; Lee, Kyoo Won ; Choi, Geun Seob ; Park, Myungkyu ; Lee, Haewan ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 1, 2014, Pages 129~134
DOI : 10.9766/KIMST.2014.17.1.129
We have developed a cost-effective and facile method to manufacture a pouch-type chemical vapor sampler. Originally, the sampler was developed by U. S. Army Natick Soldier Research, Development, and Engineering Center(NSRDEC) to determine the protective capability of individual protective ensembles or Man-in-Simulant Test (MIST). They used a selectively permeable high density polyethylene(HDPE) as front membrane and aluminum/ Nylon barrier film as an impermeable back sheet in order to mimic the actual adsorption process that occurs when the skin is exposed to chemical weapons. However, it costs over twenty dollars per sampler and the minimum of quantity is 2500 per order. In addition, it is inconvenient to employ a variety of adsorbents into the sampler, which could prevent MIST researchers to do various tests for development of MIST methodologies. Here, we report the simple method to manufacture the sampler in a laboratory scale. All the materials we used are easily obtainable and inexpensive. In addition, all the procedures we perform are generally known. We used methyl salicylate(MeS) vapor to be adsorbed into the sampler and employed several different adsorbents to evaluate the performance of samplers. The results obtained by home-made samplers and commercially avaliable one showed no significant differences. Also, MeS vapor was selectively adsorbed into the sampler depending on adsorbents. We conclude that home-made samplers are capable of collecting any kind of chemical vapor for a variety of purposes.
A Study on Measuring the Misaligned Angle between Seeker and Inertial Navigation System
Kim, Taehoon ; Lee, Hojun ; Jeong, Jinseob ; Choi, Hongseok ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 1, 2014, Pages 135~141
DOI : 10.9766/KIMST.2014.17.1.135
In order to guide a flying object which uses a seeker(SKR) and an inertial navigation system(INS) properly, we should confirm that axes of both equipments are aligned in the scope expected. In this paper we have proposed a method to measure the misaligned angle between a SKR and an INS during the system integration procedure. And we expanded this method to measure misalignments between several SKRs and an INS in case of captive flight test.
Mount Design for High-Resolution Mirrors
Kim, Kwang-Ro ; Lee, Young Shin ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 1, 2014, Pages 142~148
DOI : 10.9766/KIMST.2014.17.1.142
The mirror which is considered in designing a MFD is off-axis primary one and its dimension is wide 556mm height 345mm. The MFD(Mirror Fixation Device) load specification is generated for the high resolution mirror. The optical WFEs for unit loads are calculated from mirror sensitivity analysis and they are compared with allocated allowable optical WFE. The parasite load for the MFD is calculated from their comparison. The MFD compliant with the parasite load is designed.
Wind Tunnel Test of Aerodynamic Forces and Wind Pressures Acting on Muilti-layer Radom in Active Phased Array Radar
Yim, Sung-Hwan ; Kang, Kwang-Hee ; Choi, Ji-Ho ; Lee, Seung-Ho ; Kwon, Soon-Duck ;
Journal of the Korea Institute of Military Science and Technology, volume 17, issue 1, 2014, Pages 149~157
DOI : 10.9766/KIMST.2014.17.1.149
In this paper, we investigated the sensitivity of aerostatic force coefficients of multi-layer radom in the various wind speeds. The test was conducted in KOCED Wind Tunnel Center in Chonbuk National University, and wind speeds were in the range from 5 m/s to 26 m/s in order to determine the Reynolds number independence. The test results of present multi-layer radom were not affected by the Reynolds number, The maximum positive pressure coefficient was found to be 1.08 at the center of the front of the plane in angle of attack of 0 degree, the maximum negative pressure coefficient was -2.03 at the upper right corner in angle of attack of 120 degree, while maximum drag coefficient was 1.11 in angle of attack of 180 degree.