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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 14, Issue 6 - Dec 2011
Volume 14, Issue 5 - Oct 2011
Volume 14, Issue 4 - Aug 2011
Volume 14, Issue 3 - Jun 2011
Volume 14, Issue 2 - Apr 2011
Volume 14, Issue 1 - Feb 2011
Selecting the target year
Study on Vehicle Motion Analysis and Control for Skid Steering UGVs with Articulating Arms
Kang, Sin-Cheon ; Huh, Jin-Wook ; Lee, Sang-Hoon ; Jee, Tae-Young ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 747~752
DOI : 10.9766/KIMST.2011.14.5.747
Recently, skid steering methods have been increasingly applied to unmanned ground vehicles since they can provide a narrow turn that general steering methods like ackerman steering may not provide. However, dynamic behaviors of the skid steering vehicles with articulating arms which occur during a steering are very complicated and coupled. This makes it difficult to control vehicles and in severe case vehicles may loose stability. There are two methods to control unmanned ground vehicles. The first one is speed control method generally used with easiness and robustness in remote vehicle control. The next one is torque control allowing the vehicles to get better performance in several cases provided careful application is achieved. This paper addresses dynamic phenomena of skid steering vehicles during steering and compares with vehicle driving control methods between torque(traction force) control and speed control.
The Direction of EOD Robot(Manipulator) Developments in ROK
Lee, Seung-Ho ; Koh, Doo-Yeol ; Jung, Won-Suk ; Kim, Kyoung-Soo ; Kim, Soo-Hyun ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 753~759
DOI : 10.9766/KIMST.2011.14.5.753
In this paper, we propose the direction of development for EOD robot. We collected and analyzed the opinions of EOD teams. In order to verify the opinions, we conducted QFD(Quality Function Deployment) analysis. Based on the QFD analysis, we work out the priority of EOD robot development. And we establish the goal of development(target system) and suggest the development direction of EOD robot on each issue.
The Development Trend Analysis of Autonomous Driving Technology for Unmanned Ground Combat Vehicles
Lee, Jin-Ho ; Kim, Seok ; Lee, Cheon-Soo ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 760~767
DOI : 10.9766/KIMST.2011.14.5.760
To strategically select the technology priority based on the understanding of technology development trends and prospects is very important. To provide such guidance for autonomous driving technology in unmanned ground combat vehicles, this report deals with followings; 1) The core technologies for autonomous driving are reviewed. 2) And domestic and foreign policies for relevant technology development are investigated. 3) Then, to estimate the technology development trend, the published patents and research papers are analyzed. 4) Based on those analyses, domestic technology level and development prospects are expected.
Prediction of a Mode behavior Using Neural Network Method
Shin, Young-Sug ; Kim, Seong-Tae ; Kim, Heon-Ju ; Kim, Jae-Young ; Hwang, Chul-Ho ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 768~773
DOI : 10.9766/KIMST.2011.14.5.768
The prediction method of future events using the time histories of velocity or pressure, etc., is a useful way for controlling various air vehicles. For example, the sensors of velocity or pressure can be used to extract the time mode coefficients of eigenmode of flow field, and then the result is applied to suppress wake or drag. The velocity information is mapped to the entire flow field, so this mapping function can be used to predict the future events based on the current information. The mapping function is composed of the huge amount of weight parameters, so the efficient way of finding these parameters is needed. Here, the neural network algorithm is studied to draw a mapping function using the number and location of velocity sensors.
Development of Guidance Control Module for GPS Guided Bomb
Lim, Heung-Sik ; Yoon, Hyung-Sik ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 774~780
DOI : 10.9766/KIMST.2011.14.5.774
The guidance control module is needed for control of a GPS guided bombs to improve the accuracy and availability of a conventional bomb. In this paper, we present the development of hardware design, software design and test environments of it. And we also show the process of the tests and the results verifying and proving for its required functions and performances through ground tests and flight tests.
A Study on Unmaned Underwater Vehicle Operational Performance Analysis for Mine Search Operation
Hwang, A-Rom ; Kim, Moon-Hwan ; Lee, Sim-Yong ; Yoon, Jae-Moon ; Kim, Chan-Ki ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 781~787
DOI : 10.9766/KIMST.2011.14.5.781
Mine countermeasure missions(MCMs) may induce the loss of human and ship because of the covert of mine. In recent years, unmanned underwater vehicles(UUVs) have emerged as viable technical solution for conductimg underwater search, surveillance, and clearance operations in support of mine countermeasure missions because of her autonomy and long time endurance capability. This paper introduces a technical approach to mine countermeasure mission effectiveness analysis and presents some simulation-based analysis results for engineering of the UUV system definition which could be support analysis of alternatives for system definition and design.
Analysis of DGPS Approach and Landing Accuracy using Air Base Precision Approach Radar
Koo, Jung ; Pyo, Sang-Ho ; Kang, Kyeong-Sung ; Kim, Ki-Hyung ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 788~797
DOI : 10.9766/KIMST.2011.14.5.788
This paper analyzes the accuracy on the approach and landing of aircraft to an airport through comparison with airbase Precision Approach Radar and aircraft track data of DGPS equipped in aircraft. The proposed analysis result could be a basis for verifying the possibility that DGPS can be utilized in Airbase precision approach and landing. Position identification capability of widely used commercial DGPS is fairly accurate on latitude and longitude, while there is a slight error for being used in an airbase accurate approach and landing of Category I precision when it comes to altitude. Thus, we tested accuracy by analyzing actual flight track data of high performance aircraft to verify the accuracy of the airbase approach and landing using DGPS. Through the research, we developed instrumentation to compare PAR track data with DGPS track data, which can be used in reducing the number of PAR verification Flight utilizing it as a system measuring PAR accuracy at PAR installation phase.
Required Navigation Performance Implementation of Mission Equipment Package for Korean Utility Helicopter
Kim, Sung-Woo ; Lee, Byoung-Hwa ; Oh, Woo-Seop ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 798~804
DOI : 10.9766/KIMST.2011.14.5.798
A number of navigation improvements are envisaged : Differential GPS - WAAS, LAAS, and Performance Based Navigation. The GPS receiver verifies the integrity(usability) of the signals received from the GPS constellation through a process called receiver autonomous integrity monitoring(RAIM) to determine if a satellite is providing corrupted information. This paper describe the RAIM function and Performance-Based Navigation implementation of Mission Equipment Package(MEP) for Korean Utility Helicopter.
A Study of the Effects of Hard Landing on Aircraft Structure
Oh, Yong-Kyu ; Sim, Sang-Ki ; Shin, Ki-Su ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 805~811
DOI : 10.9766/KIMST.2011.14.5.805
Aircraft MLG and wing structures have been recognized as fatigue critical structures and exposed to the risk of fatigue crack initiation and propagation. Furthermore, these structures are frequently subjected to serious dynamic loading condition during a Hard Landing which may lead to their failure. Especially, structural integrity of MLG and wing components is decreased as the flight time increased because of the fatigue damage accumulated on the aircraft. In this study, the effects of Hard Landing on the MLG and wing components of aging aircraft were evaluated by using numerical approach. To achieve the aim, a finite element model has been developed and simulations were conducted by varying the landing conditions. As a result, it was revealed that the high stress concentration phenomenon was occurred at the lower Side Brace of MLG. Thereby, the intensified inspection for the lower Side Brace should be considered to prevent unexpected aircraft mishap.
The Improvement of the Highest Probability Data Association algorithm with Limited Measurement Numbers(HPDA-LIMN) in the Validation Gate
Lim, Young-Taek ; Hong, Young-Ki ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 812~817
DOI : 10.9766/KIMST.2011.14.5.812
In this paper, we propose new data association method called the Highest Probability Data Association with Limited Measurement Numbers(HPDA-LIMN) using a Signal Itensity Ordering method applied to tracking in clutter environment. The performance of HPDA-LIMN algorithm is tested in a series of Monte Carlo simulations runs and is compared with the exiting data association method in cluttered environment.
Modeling and Analysis of the Phase Noise in a Frequency Synthesizer for a Radar System
Kim, Dong-Sik ; Kim, Min-Cheol ; Lee, Su-Ho ; Jeong, Myeong-Deuk ; Kwon, Ho-Sang ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 818~824
DOI : 10.9766/KIMST.2011.14.5.818
In this paper, we proposed a phase noise model of a frequency synthesizer for a radar system. Especially, it was proposed a phase noise model in a DAS(Direct Analog Synthesizer) and a frequency up converter system using Leeson's model. The proposed phase noise model was derived from the measurement data of model 1 and evaluated by adapting to model 2 and model 3 frequency synthesizers. The prediction phase noise by modeling was totally matched to the measured data and the effective analysis of the phase noise was done in a frequency synthesizer and a frequency converter of radar system.
Study on Front-End Receiver for S-band Active Phased Array Radar
Kim, Min-Chul ; Kim, Wan-Sik ; Park, Sang-Hyun ; Jeong, Myeong-Deuk ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 825~832
DOI : 10.9766/KIMST.2011.14.5.825
In this paper, we described the design and measurement results of a Front-End Receiver for S-band active phased array radar. The Front-End Receiver has input P1dB of -4dBm and IIP3 of 7dBm. The measurement results show that gain is
, noise figure are less than 2.3dB over the frequency range of
. The Front-End Receiver can protect the receiver path from large input signals with a maximum peak power of multi-kW and recovery time is less than 0.8us. The measurement results satisfy all specifications.
Uncoordinated Dynamic Frequency Allocation Schemes based on Cognitive Radio in Mobile Cellular Networks
Yu, Hyun ; Jung, Jun-Woo ; Lee, Jong-Kwan ; Lim, Jae-Sung ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 833~841
DOI : 10.9766/KIMST.2011.14.5.833
In this paper, we propose uncoordinated dynamic frequency(channel) allocation schemes based on cognitive radio in mobile cellular networks(MCNs). Under the assumptions that mobile base stations are equipped with cognitive radio(CR) function and they construct uncoordinated network, the proposed scheme enables the MCNs by suppression of successive channel switching and management of channel allocation in a dynamic and distributed manner. The proposed scheme is composed of two phase processes. In the first phase, highly orthogonal sequences are generated and assigned to mobile base stations. In the second phase, each mobile base station is allocated a channel according to the pre-assigned orthogonal sequences. Simulation results show that the number of successive spectrum switching is reduced significantly compared with the random switching scheme.
Satellite Link Simulator Development in 100 MHz Bandwidth to Simulate Satellite Communication Environment in the Geostationary Orbit
Lee, Sung-Jae ; Kim, Yong-Sun ; Han, Tae-Kyun ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 842~849
DOI : 10.9766/KIMST.2011.14.5.842
The transponder simulator designed to simulate the transponder of military satellite communication systems in the geostationary orbit is required to have time delay function, because of 250 ms delay time, when a radio wave transmits the distance of 36,000 km in free space. But, it is very difficult to develop 250 ms time delay device in the transponder simulator of 100 MHz bandwidth, due to unstable operation of FPGA, loss of memory data for the high speed rate signal processing. Up to date, bandwidth of the time delay device is limited to 45 MHz bandwidth. To solve this problem, we propose the new time delay techniques up to 100 MHz bandwidth without data loss. Proposed techniques are the low speed down scaling and high speed up scaling methods to read and write the external memory, and the matrix structure design of FPGA memory to treat data as high speed rate. We developed the satellite link simulator in 100 MHz bandwidth using the proposed new time delay techniques, implemented to the transponder simulator and verified the function of 265 ms time delay device in 100 MHz bandwidth.
A Study on Cost Risk Estimation applying Joint Cost-Schedule Probability Distribution Model
Kim, Dong-Kyu ; Kang, Sung-Jin ; Han, Gyu-Sik ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 850~858
DOI : 10.9766/KIMST.2011.14.5.850
The risk analysis plays an important role in weapon system acquisition project due to uncertainties in the acquisition process. But in domestic, studies on risk analysis are insufficient and risk cost is not included in acquisition budget in policy. Therefore, in this study, we suggest a method that measures risk or success probability of project using the stochastic model. In particular, in order to calculate the success probability, we apply the joint probability distribution model of cost and schedule that are critical factors influencing the project risk. And also we verify the applicability of this model in Korean defence industry environment through case studies.
Development of Reliability Analysis Procedures for Repairable Systems with Interval Failure Time Data and a Related Case Study
Cho, Cha-Hyun ; Yum, Bong-Jin ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 859~870
DOI : 10.9766/KIMST.2011.14.5.859
The purpose of this paper is to develop reliability analysis procedures for repairable systems with interval failure time data and apply the procedures for assessing the storage reliability of a subsystem of a certain type of guided missile. In the procedures, the interval failure time data are converted to pseudo failure times using the uniform random generation method, mid-point method or equispaced intervals method. Then, such analytic trend tests as Laplace, Lewis-Robinson, Pair-wise Comparison Nonparametric tests are used to determine whether the failure process follows a renewal or non-renewal process. Monte Carlo simulation experiments are conducted to compare the three conversion methods in terms of the statistical performance for each trend test when the underlying process is homogeneous Poisson, renewal, or non-homogeneous Poisson. The simulation results show that the uniform random generation method is best among the three. These results are applied to actual field data collected for a subsystem of a certain type of guided missile to identify its failure process and to estimate its mean time to failure and annual mean repair cost.
Study on Internal Deck Structure of Turtle Ships Developed in Chos
n Dynasty Era
Han, Won-Heum ; Jung, Hyung-Sik ; Lee, Moon-Ho ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 871~879
DOI : 10.9766/KIMST.2011.14.5.871
The internal deck structure of turtle ship has been investigated with the following approach manner. Firstly the 5 species of turtle ship are identified by examining the characteristics of 5 turtle ships revealed by the librarian or paintings. Secondly the centers of gravity and buoyancy for each type are calculated to evaluate the turtle ship's buoyancy stability. Thirdly the optimal deck structures for 5 turtle ships are additionally assessed from the viewpoint of the interoperability of soldier's missions to get more meaningful conclusion. From the results obtained by the well refined analyses above, one can identify that Changjeguyseon and Lee Chung Mu Gong descendent family's turtle ship possess one layer deck, and the tongjeyoung and jwasuyoung turtle ship consist of 1 and half story deck, and the one disclosed by Yoon has 2 story structure.
A Cluster Based Multi-channel Assignment Scheme for Adaptive Tactical Wireless Mesh Network
Kim, Young-An ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 880~887
DOI : 10.9766/KIMST.2011.14.5.880
The Wireless Mesh Network(WMN) technology is able to provide an infrastructure for isolated islands, in which it is difficult to install cables or wide area such as battlefield. Therefore, WMN is frequently used to satisfy needs for internet connection and active studies and research on them are in progress. However, as a result of increase in number of hops under hop-by-hop communication environment has caused a significant decrease in throughput and an increase in delay. Considering the heavy traffic of real-time data, such as voice or moving pictures to adaptive WMN, in a military environment. Such phenomenon might cause an issue in fairness index. In order to resolve this issue, we proposed a Cluster Based Multi-channel Assignment Scheme(CB-MAS) for adaptive tactical wireless mesh network. In the CB-MAS, the communication between the Cluster-Head(CH) and cluster number nodes uses a channel has no effect on channels being used by the inter-CH links. Therefore, the CB-MAS can minimize the interference within multi-channel environments. Our Simulation results showed that CB-MAS achieves improved the throughput and fairness index in WMN.
Efficient Process Control Through Research on Storage Lifetime of a White Smoke Hand Grenade, KM8
Chang, Il-Ho ; Hong, Suk-Hwan ; Back, Seung-Jun ; Son, Young-Kap ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 888~896
DOI : 10.9766/KIMST.2011.14.5.888
A white smoke hand grenade, KM8 is used to make smoke screen in order to provide visual field interceptions or signals. The grenade fails when its time to emit smoke is longer than the specified emission time so that the smoke concentration becomes lighter. This paper considered failure in smoke emission time, and evaluated its storage lifetime. The main objective of this paper is to modify the present specification limits of smoke emission time for the efficient process control in manufacturing, through analyzing effect of its specification change on the storage lifetime, based on the lifetime evaluation results. Accelerated degradation test was performed and then failure in smoke emission time was reproduced from the test. And estimated storage lifetimes from the accelerated test results was compared to evaluated lifetimes of grenades using the ASRP data. Past process testing results of the grenade in manufacturing were analyzed in this paper. Then, each storage lifetime for the specifications,
in seconds, extended from the current specification in manufacturing were estimated using the past testing results, and compared to one another.
Analysis of Variation in the Surface Morphology of Aluminum Alloy by Repetitive Pulsed-laser Irradiation
Choi, Sung-Ho ; Kim, Chung-Seok ; Jhang, Kyung-Young ; Shin, Wan-Soon ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 897~903
DOI : 10.9766/KIMST.2011.14.5.897
The objective of this study is to investigate the thermal behavior on material surface and the variation in the surface morphology of aluminum 6061 alloy by the Nd:YAG pulsed-laser irradiation. First, we predicted the surface temperature variation during pulsed-laser irradiation by using the two dimensional finite element analysis. When the pulsed-laser of 133 mJ energy and 5 ns pulse duration is irradiated on the surface of aluminum alloy, the material surface is thought to be melting because the surface temperature rises steadily up to about
exceeding the melting point. Also, the experimental results show that the solidification microstructure has been developed clearly after surface melting. Second, the diameter of melted zone was analysed by finite element analysis and measured by OM(Optical Microscopy). It increased logarithmically with increase in the number of laser irradiation. In addition, AFM(Atomic Force Microscopy) measurement showed an increase in the average surface roughness during pulsed-laser irradiation.
M&S Tool for Analysis of Detection Coverage and Target Localization in Bistatic Radar Systems
Park, Jung-Hee ; Lee, Won-Woo ; Yoo, Jin-Cheol ; Yang, Hoon-Gee ; Chung, Young-Seek ; Bae, Kyung-Bin ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 904~912
DOI : 10.9766/KIMST.2011.14.5.904
In this paper, we have proposed a M&S tool for analyzing detection coverage and target localization in bistatic radar system. The detection coverage determined by radar parameters is meaningful when it satisfies the clear line-of-sight condition. We improved the method to find the minimum altitudes of transmitter and receiver for meeting the condition by considering three-dimensional coverage. Its computational burden is not problematic because the calculation is for maximizing the performance of the radar and does not demand a real-time operation. In addition, target localization on three-dimensional earth model based on the information of the height, longitude, and latitude is proposed instead of the previous unpractical calculation on two-dimensional bistatic plane. Its precalculated result can reduce its computation burden and it is suitable for real-time estimation of target location.
An Efficient Event Detection Algorithm using Spatio-Temporal Correlation in Surveillance Reconnaissance Sensor Networks
Yeo, Myung-Ho ; Kim, Yong-Hyun ; Kim, Hun-Kyu ; Lee, Noh-Bok ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 913~919
DOI : 10.9766/KIMST.2011.14.5.913
In this paper, we present a new efficient event detection algorithm for sensor networks with faults. We focus on multi-attributed events, which are sets of data points that correspond to interesting or unusual patterns in the underlying phenomenon that the network monitors. Conventional algorithms cannot detect some events because they treat only their own sensor readings which can be affected easily by environmental or physical problem. Our approach exploits spatio-temporal correlation of sensor readings. Sensor nodes exchange a fault-tolerant code encoded their own readings with neighbors, organize virtual sensor readings which have spatio-temporal correlation, and determine a result for multi-attributed events from them. In the result, our proposed algorithm provides improvement of detecting multi-attributed events and reduces the number of false-negatives due to negative environmental effects.
Investigation of the Pharmacological Mechanisms and the R&D of Medical Countermeasures Against Nerve Agent Poisoning
Cho, Young ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 920~931
DOI : 10.9766/KIMST.2011.14.5.920
Nerve agents are irreversible inhibitors of the cholinesterase enzyme. Exposure causes a progression of toxic signs, including hypersecretions, fasciculations, tremor, convulsions, respiratory distress, epileptiform seizures, brain injuries and death. A combined regimen of prophylaxis and therapy is the most effective medical countermeasure for dealing with the threat of nerve agent poisoning to military personnel. In this paper, the author investigated the updated technologies regarding various pre- and post-treatment drugs for nerve agents detoxification which are under development in several countries including Korea. Some characteristics of active ingredients in the formulations of drugs, their action mechanisms, and effectiveness were analyzed. Additionally, part of experimental data on the transdermal patch studied in ADD using beagle dogs was introduced.
Study on the Computational Simulation of Large Scale Gap Test
Lee, Jin-Sung ; Park, Jung-Su ; Lee, Young-Shin ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 932~940
DOI : 10.9766/KIMST.2011.14.5.932
This study describes computational simulation results in 2-dimensional and 3-dimensional space concerning large scale gap test(LSGT) by using commercial hydrocode such as AUTODYN and LS-DYNA to analyze the detonation phenomenons of high explosives. To consider the possibilities of LSGT simulation, we used Lee - Tarver reaction rate model of PBX-9404 and Comp-B which were implemented AUTODYN's material library. Also we have tried the diverse numerical schemes such as Lagrangian, Eulerian and ALE(Arbitary Lagrangian Eulerian), SPH(Smoothed Particle Hydrodynamics) in LSGT simulations. After LSGT simulations, we compared the simulation results with published results to verify the LSGT simulations. According to the LSGT simulations, we have concluded as follows. In 2-dimensional and 3-dimensional space, Lagrangian solver provided the most reliable results based on analysis time and accuracy. When using two hydrocodes in 2-dimensional space, the simulation results are almost same except one explosive model. We have verified the modeling method and simulation results of the LSGT by using the commenrcial hydrocode in this study.
Consensus of High-order Linear Systems with Directed Communication Topology Using LMI Approach
Kim, Su-Bum ; Choi, Hyoun-Chul ; Lee, Sung-Hun ; Kim, Kang-Seok ; Joo, Seoung-Yul ; Hong, Woo-Young ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 941~947
DOI : 10.9766/KIMST.2011.14.5.941
This paper deals with the consensus problem for multi-agent linear dynamic systems with directed communication topology. All the agents are identical high-order linear systems and their state information is exchanged through a communication network with directed graph. It is shown that a consensus is achieved if there exists a feasible solution to a set of linear matrix inequalities obtained for a simultaneous stabilization problem for multiple systems. Examples are presented to show the effectiveness of the proposed method.
Study of the Design of an Explosive Ordnance Disposal Manipulator for Small Unmanned Ground Vehicle
Koh, Doo-Yeol ; Lee, Seung-Ho ; Rhee, Joon-Seong ; Hwang, Ki-Sang ; Kim, Soo-Hyun ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 948~956
DOI : 10.9766/KIMST.2011.14.5.948
In this paper, mechanism design of the explosive ordnance disposal(EOD) manipulator for small unmanned ground vehicle(SUGV) is presented from the conceptual to detailed design. EOD manipulator has been widely developed in the world due to the growing threat of the improvised explosive devices at war. It has distinctive characteristics, such as small size and high loading performance, compared to the industrial manipulator which is fixed on the floor. Design of new EOD manipulator must take into account various functional requirements and constraints simultaneously. We focused on developing the EOD manipulator that has suitable size for the SUGV and maximum 15kg payload capacity. Design approach taken in this paper is based on axiomatic design procedure and comparison among many possible candidates of each joint structure to obtain appropriate entire structure of EOD manipulator.
A Comparative Study on Single Time Schemes Based on the FEM for the Analysis of Structural Transient Problems
Kim, Woo-Ram ; Choi, Youn-Dae ;
Journal of the Korea Institute of Military Science and Technology, volume 14, issue 5, 2011, Pages 957~964
DOI : 10.9766/KIMST.2011.14.5.957
New time schemes based on the FEM were developed and their performances were tested with 2D wave equation. The least-squares and weighted residual methods are used to construct new time schemes based on traditional residual minimization method. To overcome some drawbacks that time schemes based on the least-squares and weighted residual methods have, ad-hoc method is considered to minimize residuals multiplied by others residuals as a new approach. And variational method is used to get necessary conditions of ad-hoc minimization. A-stability was chosen to check the stability of newly developed time schemes. Specific values of new time schemes are presented along with their numerical solutions which were compared with analytic solution.