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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
Selecting the target year
A Local Path Planning Algorithm considering the Mobility of UGV based on the Binary Map
Lee, Young-Il ; Lee, Ho-Joo ; Ko, Jung-Ho ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 2, 2010, Pages 171~179
A fundamental technology of UGV(Unmanned Ground Vehicle) to perform a given mission with success in various environment is a path planning method which generates a safe and optimal path to the goal. In this paper, we suggest a local path-planning method of UGV based on the binary map using world model data which is gathered from terrain perception sensors. In specially, we present three core algorithms such as shortest path computation algorithm, path optimization algorithm and path smoothing algorithm those are used in the each composition module of LPP component. A simulation is conducted with M&S(Modeling & Simulation) system in order to verify the performance of each core algorithm and the performance of LPP component with scenarios.
Mission Oriented Global Path Generation for Unmanned Combat Vehicle Based on the Mission Type and Multiple Grid Maps
Lee, Ho-Joo ; Lee, Young-Il ; Lee, Myung-Chun ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 2, 2010, Pages 180~187
In this paper, a global path generation method is suggested using multiple grid maps connected with the mission type of unmanned combat vehicle(UCV). In order to carry out a mission for UCV, it is essential to find a global path which is coincident with the characteristics of the mission. This can be done by considering various combat circumstances represented as grid maps such as velocity map, threat map and communication map. Cost functions of multiple grid maps are linearly combined and normalized to them simultaneously for the path generation. The proposed method is realized using
, a well known search algorithm, and cost functions are normalized in the ratio of the traverse time which is one of critical information should be provided with the operators using the velocity map. By the experiments, it is checked found global paths match with the mission type by reflecting input data of grid maps properly and the computation time is short enough to regenerate paths in real time as combat circumstances change.
Performance Analysis of a Criterion to Verify the Consistency of Measured Angles of Towed Array and Frank Array
Park, Hyun-Woo ; Jung, Tae-Jin ; Kwon, Bum-Soo ; Lee, Kyun-Kyung ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 2, 2010, Pages 188~195
Unlike using a single sonar platform, using two different sonar platforms can lead to a considerable increase of acoustic aperture in Passive Ranging Sonar(PRS). Values measured from two sonar platforms shall be consistent in order to allow us to rely on such improved aperture. However, obtaining consistent values from a towed array and a frank array is not always simple due to the heading error occurring at towed array. The objective of this paper is to verify a new criterion analyzing the consistency in the measured values of towed array and frank array through computer simulations.
Source Information Estimation Using Enemy's Single-Ping and Underwater Geographic Information in Non-Cooperative Bistatic Sonar
Lee, Dong-Hwa ; Nam, Jong-Geun ; Jung, Tae-Jin ; Lee, Kyun-Kyung ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 2, 2010, Pages 196~203
The bistatic sonar operations using a spatially-separated source and receiver are classified into cooperative and non-cooperative operations. In the cooperative operation, an active signal of a friendly ship is used and the source information is known previously. In the non-cooperative operation, an active signal of the enemy is used and it is difficult to find out the source information. The source information consists of the range, speed, course and frequency of the source. It gives advantage to operating bistatic sonar. This paper suggests a method of estimating the source information with geographic information in the sea and the single-ping of the enemy. The source range is given using one geographic point. And the source speed, course and the frequency of the enemy's source signal are given using two geographic points. Finally, the validity of the scheme is confirmed through a simulation study.
The Study on Anti-Submarine Search Pattern of the Surface Ship Considering the Torpedo Countermeasure Tactics
Lee, Min-Kyu ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 2, 2010, Pages 204~210
The tactical effectiveness, which is the result of applying decision-making algorithms to respond a specific situation with weapons and sensors, is required to analyze according to the integrated combat situation, because each situation, which is intimately involved with each other, influences the surface ship to complete missions successfully. However, the tactical effectiveness have been analyzed in separation of each tactical situation due to the complexity of the integrated tactical situation. This paper is originated from the needs for analyzing the anti-submarine search region of the surface ship after it evades the torpedo by operation of the torpedo countermeasure tactics. It also describes simulation results of effectiveness analysis for the search patterns in the search region.
Minimization of Shadow Zone for Hull Mounted Sonar
Lim, Se-Han ; Han, Yun-Hoo ; Jang, Chan-Joo ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 2, 2010, Pages 211~217
This paper introduces the Hull Mounted Sonar Vertical Scanning(HMS Verscan) technique to overcome the limitation of target detection in short range shadow zone. Numerical experiments were done with the HMS Verscan taking advantage of the vertical beamforming technique for two-dimension hydrospace(range-depth). For numerical experiments, ray model and high-frequency monostatic reverberation model were used. HMS Verscan increased a sound pressure level at the short range shadow zone through reflections at the sea surface and seafloor. Inclusion of the boundary scattering improved target detection due to the sound reflected into the shadow zone.
A General Purpose Engagement Simulator using a Tactical Data-link
Yun, Keun-Ho ; Jin, Jung-Hun ; Kim, Seh-Hwan ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 2, 2010, Pages 218~226
The tactical data-link is useful to exchanging automatic information and controling command in combat environment. This is a essential factor of interoperability in the future combat situation of network centric warfare. In a aspect of a weapon system development, Modeling & Simulation can save expense. HLA RTI is a standard communication protocol in M&S. So, we suggest that Link Simulator connect tactical data-link through RTI. This simulator has the interoperability between M&S and tactical data-link, the reusability through adabing M&S framework, and the wide usability by automatic engagement function.
A Study on the Distribution of Rainfall over the Korean Peninsula for the Generation of Rainfall Operational Specifications for Weapon Systems using Electromagnetic and Optical Sensors
Lee, Dong-Ju ; Kim, Jai-Ha ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 2, 2010, Pages 227~234
When a weapon system is developed, climate elements such as temperature, rainfall, and so on have an effect on development costs and a developing period. Therefore, effects of environment and climate must be examined throughly before the design of weapon systems and be applied to their developments. And so, operational and storage requirements for weapon systems are determined and are applied to related tests through analyzing not only environmental factors such as vibration, shock, and so on, but also climate factors. In this paper, the distribution and the frequency of occurrence of rainfall were analyzed and were suggested as a good guide to determine standards of tests for weapon systems when it's raining.
A Study on the CMMI Engineering Process Area Modelling of Test Process
Choi, Ju-Ho ; Ryu, Chung-Ho ; Jang, Young-Sik ; Kim, Heung-Bum ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 2, 2010, Pages 235~242
DSTC(Defense Systems Test Center) in ADD(Agency for Defense Development) performs a test for various kinds of weapon system. In order to provide accurate test measurement data relating to the weapon system's performance with customer, A reliable test process and an objective analysis of the measurement data are required. DSTC is trying to apply CMMI(Capability Maturity Model Integration) Ver 1.2 in a test process. In this paper, we present the result of CMMI Engineering Process Area Modelling of Test Process.
The Performance Experiments on the Tactical Data Communication over the Legacy Radio Systems
Sim, Dong-Sub ; Kang, Kyeong-Sung ; Kim, Ki-Hyung ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 2, 2010, Pages 243~251
The military has been putting great efforts into applying data communication on existing voice communication systems being used in NCW(Network Centric Warfare). Data communication will be an effective choice in one of many effort to yield a minimum kill chain, comparing to legacy voice communications, when tactical units conduct their missions. However, the required budget will be enormous, in case of the replacement of a lot of legacy communication systems with new one. As a cost-effective alternative, the tactical data communication systems using the conventional radio systems instead of the development of new radio systems has been proposed. It is mandatory, though, to ensure QoS while maintaining data communication by making use of legacy radio systems already in use. This paper focuses on the performance issues experimented and analyzed for tactical data communication through the legacy radio systems as the first step towards guaranteed QoS. We have conducted various experiments such as the transmission error rate on certain tactical messages, performance evaluation of redundant transfers, the relationship between the transmission frame size and rate of error, the identification of error points in the transmission frame, and techniques to reduce the errors in both hopping and non-hopping modes. As a result of the performance experiments, The adaptive communication module which decides the redundant transmission or the Forward Error Correction(FEC) technique by analyzing channel status and current transmission status(hopping/non-hopping) of the legacy radio should be designed. the FEC technique in non-hopping, and the redundant transmission technique in hopping mode was recommended from the result of experiment with the frame size is 20bytes in non-hopping and 10Bytes frame size in hopping mode.
A Study on Evaluation of Jamming Performance on SAR Satellite
Lee, Young-Joong ; Kim, In-Seon ; Park, Joo-Rae ; Kwak, Hyun-Kyu ; Shin, Wook-Hyun ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 2, 2010, Pages 252~257
SAR has pulse compression gain through the process including range and azimuth. Efficient jammers against the SAR with simulated elements are evaluated in the view of power and SAR image. In this paper, J/S is analysed for SAR with RF propagation equation firstly. Several jamming signals on SAR signal are made into SAR image through pulse compression process. Objective jamming performance is evaluated using euclidean distance.
On Improving the Reverse Engineering Process by Effectively Utilizing the Functional Models
Lee, Byoung-Gil ; Lee, Jae-Chon ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 2, 2010, Pages 258~267
The necessity of the new system development arises in both defence and commercial systems industry either when a breakthrough in technology needs to be realized in the form of a brand-new system or when the existing product already in operation needs to be upgraded to satisfy the increasing stakeholder's requirements. In the latter case, it is not rare that specific system technical specifications on the existing products are not available. The purpose of this study is to investigate how to handle the difficulty when an upgraded system is required to be developed based on the existing product whose detailed technical specifications cannot be obtained. A step-by-step process is described based on the reverse engineering of the existing product. As a result, a logical system model is obtained for the product. The process developed is further enhanced and evaluated by the computer-aided system engineering tool. The resulting logical system model should be helpful in the next phase of the new product development.
Steganographic Method Based on Three Directional Embedding
Jung, Ki-Hyun ; Kim, In-Taek ; Kim, Jae-Cheol ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 2, 2010, Pages 268~274
A steganographic method using three directional data embedding for gray images is presented in this paper. Cover image is divided into non-overlapping
sub-blocks and the basis pixel is selected to calculate the three different values of each sub-block. Difference values are replaced by embedding the number of secret bits that is referenced by the range table. For the three pixel pairs in the sub-block, the optimal pixel adjustment is preceded to reduce the distortion of visual quality. The experimental results show that the proposed method achieves a good visual quality and high capacity.
A Study on Surface properties of Cr-Mo-V Steel by Eco-friendly Salt Bath Nitriding Treatment
Jung, Gil-Bong ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 2, 2010, Pages 275~282
The improved properties of surface layer can be achieved by so-called "new salt bath nitriding(NSBN)", which has been developed by a domestic company. This process based upon modified traditional salt bath nitriding process, increased hardenability with minimum toughness deterioration. This process also offers not only less white layer surfaces but also more eco-friendly one. That is, NSBN is the new eco-friendly surface treatment technology removing harmful
and toxic gas. According to the research of applying NSBN to Cr-Mo-V steel which has been used in defense industry, showed the improved result of wear resistance and surface hardening than non-coated condition. In further, we expect NSBN to curtail expenses and productivity improvement applied to the various defense industry parts.
The Study Application of Identification Based on Small Units USN(Ubiquitous Sensor Network)
Kim, Do-Heon ; Kim, Do-Yeob ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 2, 2010, Pages 283~295
Although some large units, upper than division, have a identification system, most of them depend on US military. Especially, the company unit can not but execute GOP(General OutPost) guidance and battles inefficiently because they apply the method of conventional identification system. urrently, North Korea causes the high tension of peninsular by experimenting nuclear weapons and launching ICBM(Intercontinental Ballistic Missile). In addition, ROK military will reduce the number of personnel and division through reorganizing the structure into NCW (Network Centric Warfare) until 2020. These unstable situation and future tendency require the high technical identification system based on USN(Ubiquitous Sensor Network) in company unit level. his study suggests the method that the company unit apply the identification system based on USN which distinguish between friend and foe in the warfare. The identification system concludes the results through experiment of military analysis model (AWAM; Army Weapon effectiveness Analysis Model). After analyzing the experiment results, it indicates the budget requirement and operational operability of identification system. This will be able to improves battle efficiency and to prevent damages of friendly forces.
Analysis of GPS Spoofing Characteristics and Effects on GPS Receiver
Shin, Mi-Young ; Cho, Sung-Lyong ; Kim, Jun-Oh ; Song, Ki-Won ; Lee, Sang-Jeong ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 2, 2010, Pages 296~303
The term "spoofing" refers to the transmission of counterfeit signals to provide undetectable falsification of GPS service. A spoofing can be accomplished using information from open literature which defines the signal format and the data structure. Spoofing is intended either to produce erroneous navigation solutions or saturate the processor of the victim receiver. The GPS receiver has no way to get rid of the effect of a spoofing because GPS receivers for civil service do not have an anti-spoofing scheme. This paper analyzes the spoofing characteristics, spoofing methods and environment conditions. And the spoofing effects on GPS receiver are analyzed in detail using the designed software-based spoofer and the Nordnav receiver.
IRCM Jamming Effect Analysis of a Stationary Reticle Seeker
Ahn, Sang-Ho ; Kim, Young-Choon ; Lee, Kwang-Sei ; Kim, Ki-Hong ; Kim, Sung-Soo ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 2, 2010, Pages 304~312
The function of IRCM(Infrared Countermeasures) jamming is to cause the missile to miss its intended target by disturbing the seeker tracking process. This paper analyzes the jamming effect of IRCM jamming for a stationary reticle seeker. The phase error containing the azimuth angle information of target is analyzed for the intensity, frequency and duty ratio variation of the jammer pulse signal. We confirmed that the more the jammer frequency is similar to the spinning frequency of the stationary seeker, the more jamming effect is high.
Performance Analysis of Spatial Adaptive Null Pattern Control Algorithm for 5 Elements Array Antenna
Ahn, Seung-Gwan ; Lee, Sang-Jeong ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 2, 2010, Pages 313~319
GNSS receiver which uses the weak satellite signal is very vulnerable to the intentional jamming or non-intentional electromagnetic interference. One of the best method to overcome this disadvantage is to use an adaptive array antenna which has the capability of beamforming or nulling to the certain direction. In this paper, the performance of spatial adaptive null pattern control algorithm of 5 element array antenna is analyzed. A control algorithm which is designed in the 5 element array antenna is OPM(Output Power Minimization) which is eliminating the correlation characteristics between a reference antenna and the others. This algorithm can be applied effectively to the satellite navigation's CRPA because the satellite direction is not considered and GNSS signal power is below the thermal noise. The feature of the OPM algorithm is analyzed and the performance is compared with other null pattern control algorithm.
Study on IR Signature Characteristics for different Transmittance over the Korean South Sea during Summer and Winter Seasons
Choi, Jun-Hyuk ; Kim, Jung-Ho ; Jung, In-Hwa ; Lee, Phil-Ho ; Kim, Tae-Kuk ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 2, 2010, Pages 320~327
The IR signature data of a ship is mainly affected by location, meteorological conditions(atmosphere temperature, wind direction and velocity, humidity etc.), atmospheric transmittance, solar position and ship surface temperature etc. The IR signatures received by a remote sensor at a given temperature and wavelength region is consisted of the self-emitted component directly from the object surface, the reflected component of the solar irradiation at the object surface, and the scattered component by the atmosphere without ever reaching the object surface. Computer simulations for prediction of the IR signatures of ships are very useful to examine the effects of various sensor positions. In this paper, we have acquired the IR signature for different sensor positions by using computer program for prediction of the IR signatures. The numerical results show that the IR signature contrast as compared to the background sea considering the meteorological conditions, solar and sky irradiations.
Optical System Design and Image Processing for Hyperspectral Imaging Systems
Heo, A-Young ; Choi, Seung-Won ; Lee, Jae-Hoon ; Kim, Tae-Hyeong ; Park, Dong-Jo ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 2, 2010, Pages 328~335
A hyperspectral imaging spectrometer has shown significant advantages in performance over other existing ones for remote sensing applications. It can collect hundreds of narrow, adjacent spectral bands for each image, which provides a wealth of information on unique spectral characteristics of objects. We have developed a compact hyperspectral imaging system that successively shows high spatial and spectral resolutions and fast data processing performance. In this paper, we present an overview of the hyperspectral imaging system including the strucure of geometrical optics and several image processing schemes such as wavelength calibration and noise reduction for image data on Visible and Near-Infrared(VNIR) and Shortwave-Infrared(SWIR) band.
Storage Lifetime Improvement of Zr-Ni K1 Delay System
Chang, Il-Ho ; Back, Seung-Jun ; Jung, Eun-Jin ; Son, Young-Kap ;
Journal of the Korea Institute of Military Science and Technology, volume 13, issue 2, 2010, Pages 336~341
The burning interruption between the initiator and the delay column in a Zr-Ni K1 delay system used for a K510 fuze occurs with long-time storage. About 10 % failure probability of 15-years stored delay systems shows the failure mode in open literature. This paper shows storage lifetime improvement results for the delay system through changing the single-base delay column into double-base ones and controlling the manufacturing processes especially the initial inclusion of humidity. The double-base delay columns was implemented by inserting one delay column of fast burning rates between the initiator and the previous delay column of slow burning rates. Accelerated aging tests of the delay systems with double-base columns, and then the firing tests were performed to evaluate the improved lifetime. The double-base delay columns shows improved storage lifetime of the delay system through preventing the failure mode.