• The Transactions of the Korean Institute of Electrical Engineers A
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• v.48 no.10
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• pp.1327-1334
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• 1999

The stabilization control of ball-beam system is difficult because of its nonlinearity and structural unstability. Futhermore, a series of classical methods such as the PID and the full state feedback controller(FSFC) based on the local linearizations have narrow stabilizable regions. At the same time, the fine tunings of their gain parameters are also troublesome. Therefore, in this paper, three improved design techniques of stabilization controller for a ball-beam system were proposed. These parameter tuning methods in the double PID controller(DPIDC), the FSFC and the a sliding mode controller(SMC) were dependent upon the Real Value Elitist Genetic Algorithm (RVEGA). Finally, by applying the DPIDC, the FSFC and the Real Variable Elitist Genetic Algorithm based Sliding Mode Control(RVEGA SMC) to the stabilizations of a ball-beam system, the performances of the RVEGA SMC technique were showed to be superior to those of two other type controllers.

• Journal of Institute of Control, Robotics and Systems
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• v.12 no.8
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• pp.810-817
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• 2006

This paper presents a rotational motion estimation and correction technique for digital image stabilization. An equivalent rotation model is derived so as to accommodate a combined rotational and the translational motion. Thanks to this simplification, the suggested estimation algorithm can directly find the rotational center using geometric characteristic of local motion vectors instead of using searching method. And we also present recursive version of frame to reference algorithm(FRA) for the real time implementation. The proposed DIS system does not require time consuming parameter searching process, while showing comparatively good performance compared with the previous ones. To show the effectiveness of the DIS scheme, the algorithm has been implemented on the DSP based hardware system and experimental results are also discussed.

• Journal of the Korea Institute of Military Science and Technology
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• v.19 no.3
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• pp.288-293
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• 2016

Electronic Image Stabilization(EIS) is widely used as a technique for correcting a shake of an image. The case requiring the EIS function has been increased in high magnification thermal image observation on portable military equipment. Projection Algorithm(PA) for EIS is easy to implement but its performance is sensitive to the projection area. Especially, projection profiles of thermal image have very modest change and are difficult to extract image shifts between frames. In this paper, we proposed algorithm to extract a feature image for the thermal image and compared Block Matching Algorithm(BMA) with PA using our proposed feature image. When using our proposed feature image, BMA was simply implemented using FPGA's internal small memory. And we were able to obtain 30 % PSNR improved results compared to PA.

• Bulletin of the Korean Mathematical Society
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• v.53 no.2
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• pp.423-440
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• 2016

The bubble stabilization technique of Chebyshev-Legendre high-order element methods for one dimensional advection-diffusion equation is analyzed for the proposed scheme by Canuto and Puppo in [8]. We also analyze the finite element lower-order preconditioner for the proposed stabilized linear system. Further, the numerical results are provided to support the developed theories for the convergence and preconditioning.

• 제어로봇시스템학회:학술대회논문집
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• 2001.10a
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• pp.125.1-125
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• 2001

This paper deals with the eigenvalue assignment technique for linear time-varying systems to achieve feedback stabilization. For this, we introduce the novel eigenvalue concepts. Then, we propose the Ackerman-like formula for linear time-varying systems. It is believed that this technique is the generalized version of the Ackerman formula forlinear time-invariant systems. The advantages of the proposed technique are that it does not require the transformation of the original system into the phase-variable form nor the computation of eigenvalues of the original system.

• Proceedings of the KIEE Conference
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• 1996.07b
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• pp.1137-1139
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• 1996

Feedback Linearization technique needs the exact cancellation of nonlinearity which restricts its application to real environment. To overcome these shortcomings, High-pin feedback is good remedy to this problem. In this paper, we briefly survey the high-gain feedback control technique and show some conditions for applying this method to nonlinear systems. In order to use this technique in real situation, some properties of ${\varepsilon}$-bound and semi-global stabilization are discussed.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.22 no.1
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• pp.47-57
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• 2010

Subgrid scale stabilization method is applied to Woo and Liu(2004)'s extended Boussinesq FEM numerical model to eliminate the 2dx wiggles. In order to optimize the computational efficiency, Hessian operator is introduced and the matrix of velocity vector is combined to one matrix for solving matrix equations. The mass lumping technique is also applied to the matrix equations of auxiliary variables. The newly developed code is applied to simulate Vincent and Briggs(1989)' wave transformation experiments and the results show that the numerical solution is almost wiggle-free and it matches very well with experimental data. Due to improvement of computational efficiency and wiggle reduction, it is plausible to apply this model to a realistic problem such as harbor oscillation problems.

• PNF and Movement
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• v.14 no.2
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• pp.105-112
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• 2016

Purpose: The purpose of this study was to examine the effects of proprioceptive neuromuscular facilitation (PNF) wrist taping, after the application of a rhythmic stabilization (RS) technique, on the decrease of pain and the increase of grip strength in physical therapists who complained of wrist pain and to provide basic data on interventions for wrist pain patients. Methods: The subjects were 15 peoples in their 20s who complained of pain with a visual analogue scale (VAS) at five points or higher due to overuse of their wrists. They were randomly assigned to a control group, to which PNF wrist taping was applied after stretching (n=7), or to an experimental group (n=8), to which PNF wrist taping was applied after application of the RS technique of PNF. The experiment was conducted for four weeks, five times per week. VAS was measured in order to measure pain decrease, and grip strength (GS) was measured using a dynamometer. In order to compare within-group differences before and after the intervention, a paired t-test was performed, and in order to compare differences between the two groups, the analysis of covariance (ANCOVA) was used. All statistically significant levels were set at ${\alpha}=0.05$. Results: There were significant differences in changes of VAS and GS within each group before and after the intervention (p<0.01), but there was no significant difference between the two groups. Conclusion: This study applied PNF wrist taping after the application of stretching or PNF RS to patients who complained of pain beyond a sense of discomfort; these interventions resulted in a decrease in pain and an increase in the grip strength of the subjects. Taping and therapeutic techniques using PNF are considered to be usefully applied as one of the programs to improve wrist pain patients' pain and grip strength.

• Journal of the Korea Institute of Military Science and Technology
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• v.17 no.6
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• pp.786-792
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• 2014

In this paper, we propose a novel method which can be applied to test and verify the stabilization-tracking performance of Gun/Turret Driving System(GTDS) for Light Armed Helicopter(LAH). In real system, GTDS is connected to TADS/SMC and drived to aim at the target with 20mm gun. But each equipment is separately developed during exploratory development stage, so GTDS cannot be tested under real system state. We suggest new configuration of test system for evaluating the stabilization-tacking performance, in which TADS and SMC are replaced by vision acquisition unit and processing unit, respectively.

• Journal of The Korean Society of Integrative Medicine
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• v.6 no.1
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• pp.83-89
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• 2018

Purpose : The purpose of this study was to examine the effects of the trunk stabilization exercise in the musical tempo on lumbar lordosis angle, muscle activity and pain. Methods : For the 30 people with lumbar lordosis angle legion and back pain, a random selection was made with MLSE (15) and LSE (15) to measure VAS, lumbar lordosis angle and Muscle Activity. Result : There were significant decreases in intra group comparisons to lumbar lordosis angle were seen in MLSE and LSE groups, and significant decreases in inter group comparisons in MLSE groups. significant decreases in intra group comparisons to VAS were seen in MLSE and LSE groups, and significant decreases in inter group comparisons in MLSE groups. Significant intra-group comparison of muscle activity, MLSE groups increases were rectus obdominis(right/left) and erector spinae muscle(right/left), LSE groups increases were erector spinae muscle(right/left), and significant increases in inter group comparisons rectus obdominis(right) and erector spinae muscle(left) in MLSE groups Conclusion : Based on the above findings, a program to restore the lumbar lordosis angle, and increase muscle strength should be developed at by applying the combine existing trunk stabilization physical therapy technique and musical tempo.