• Journal of IKEEE
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• v.22 no.2
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• pp.362-368
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• 2018

This paper has implemented a mutual conversion system that mutually converts between body motion signals and both visual and auditory signals. The present study is based on intentional synesthesia that can be perceived by learning. The Euler's angle was used in body movements as the output of a wearable armband(Myo). As a muscle sense, roll, pitch and yaw signals were used in this study. As visual and auditory signals, MIDI(Musical Instrument Digital Interface) signals and HSI(Hue, Saturation, Intensity) color model were used respectively. The method of mutual conversion between body motion signals and both visual and auditory signals made it easy to infer by applying one-to-one correspondence. Simulation results showed that input motion signals were compared with output simulation ones using ROS(Root Operation System) and Gazebo which is a 3D simulation tool, to enable the mutual conversion between body motion information and both visual and auditory information.

• PNF and Movement
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• v.17 no.3
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• pp.431-439
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• 2019

Purpose: This study investigated the effects of motion taping on muscle stiffness, muscle tone, and pain in middle-aged women with shoulder impingement syndrome. Methods: The participants comprised 30 middle-aged women with shoulder impingement syndrome. This study measured muscle stiffness, muscle tone, and pain. In the experimental group, the tape was attached after physical therapy; the control group only received physical therapy. In the intervention period, the treatment program was conducted three times a week for a total of four weeks, and the values before and after the intervention were compared and analyzed. For statistical processing, a correspondence test was performed before and after the intervention at a significance level of 0.05, and the comparison between the groups, before and after the intervention, was made using an independent test. Results: In the experimental group, there was a difference in muscle stiffness, muscle tone, and intensity of pain. In addition, there was a significant difference between the control group's emotional domain regarding muscular stiffness and pain and the experimental group. However, there was no significant difference in muscle tone and grade of pain, and intensity of pain for the control group. Conclusion: This study showed that, when physical therapy and motion taping were administered to middle-aged women with shoulder impingement syndrome, it had a more positive affect on the sensory and emotional parts of the muscle tone and pain compared to physical therapy alone.

• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.1060-1065
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• 2003

This paper contributes to development of a new chip mounting head system for flip chip. Recently, the LDM(Linear DC Motor) has been widely used, because it has particular merits than the rotary type motors. In this paper, we proposed a macro/micro positioning system for force control of a chip mounting system. In the proposed macro/micro system, the macro actuator provide the system with a gross motion while the micro device yields fine tuned motion to reduce the harmful impact force that occurs between very small sized electronic parts and PCB surface. In order to prove the effectiveness of the proposed macro/micro chip mounting system, we compared the proposed chip mounting head with the conventional chip mounting head equipped with a macro actuator only. A series of experiments were executed under the mounting conditions of various access velocities and PCB stiffness. As a result of this study, a satisfactory voice coil actuator as the micro actuator has been developed, and its performance meet well the specifications desired for the design of the chip mounting head system and show good correspondence between theoretical analysis and experimental results.

• Proceedings of the KIEE Conference
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• 2006.10d
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• pp.218-221
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• 2006

This paper reports on a Realtime OS based motor control system for laparoscopic surgery robot which enables telesurgery and overcomes shortcomings with conventional laparoscopic surgery. The system has a conventional master-slave robot configuration and the control system consists of joint controllers, host controllers, and power units. The robot features (1) a compact slave robot with 5 DOF (Degree Of Freedom) expanding the workspace of each tool and increasing the number of tools operating simultaneously, and (2) direct 1:1 correspondence in the joint of master and slave robot that simplifies control algorithm and enhances reliability. Each master, slave and GUI (Graphical User Interface) host has a dedicated RTOS (RealTime OS), RTLinux-Pro (FSMLabs Inc., U.S.A.) Each master and slave controller set pair has a dedicated CAN (Controller Area Network) channel for control and monitoring signal communication. Total 4 pairs of the master/slave manipulators as current are monitored by one host controller for operation monitoring and higher level motion control. The system showed acceptable performance in both position control precision and master-slave motion synchronization and is now under further development for better safety and control fidelity for clinically applicable prototype.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2005.11a
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• pp.744-749
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• 2005

In this paper, a lens actuator for mobile devices is proposed using stack type piezoelectric materials. In general, the deformation of PZT actuators is not enough for lens motion when the allowed voltage is applied. The small stroke problem can be solved by accumulating a lot of small displacements in high frequency. In this paper, a new inch-worm type model for focusing actuator is suggested based on the interaction of inertial and frictional forces. Theoretical analysis and simulation using ANSYS are performed to verify the feasibility of the inch-worm PZT actuator model. Various types of clamps are considered to determine the effect of frictional force on the motion, and appropriate clamp-actuator models are proposed. The proposed models are experimentally verified and the experimental results show high correspondence with theoretical and simulated values. The inch-worm type focusing actuator enable a large stroke with 7.79 mm/sec with 10kHz and 10V.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.28 no.1
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• pp.39-46
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• 2010

Sounding data is the essential source for the safety of ships navigation system, and fundamental to the reasonable usage and maintenance of the ocean as well. As IT tech, positioning equipment such as GPS and INS, echo sounder are developed, recently, the precise submarine topography database bas been built by Multi-Beam Echo Sounder. However, MBES data includes some inevitable error caused by several factor, and some data have errors where the terrain is wobble. The error, which causes the $moir\acute{e}$ pattern error is the main factor hindering the accuracy of MBES data results, and therefore it is necessary to figure out the main cause of the error for the improvement of the accuracy by removing error data. On this research, the main cause of the error data is studied by analyzing motion sensor value of data including the $moir\acute{e}$ pattern error. Thus, as the result of examination, it turns out that the $moir\acute{e}$ pattern error is related to the standard deviation of Roll, and error data values are results of the non-correspondence between Swath data and Roll values caused by the drastic change of Roll values. Accordingly, the error data is removed by comparing between the gradient of Swath data and Roll values. Finally, as the result of removing error data, it is expected to be able to estimate the quality of MBES using the standard deviation of Motion sensor's Roll value, and calculate the additive error factor, which minimize non-corresponding data, and also this research must be contributed to improve the accuracy of sounding for small vessels with lots of motion in the bad circumstance for navigation.

• Journal of the Korea Computer Graphics Society
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• v.5 no.1
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• pp.19-26
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• 1999

목표지향적 동작 합성기법은 원하는 동작의 타입(예, 발 차기, 손 뻗기)과 동작의 최초 및 최종상태가 주어졌을 때, 이 조건을 만족하는 새로운 동작을 유사한 동작들의 집합(동작군)에 속한 동작들을 혼합하여 자동적으로 생성하는 기법이다. 이 기법은 동작군에 속한 동작들의 커브를 지나는 연속적이고 완만한 곡면으로 생성한 후, 그 곡면 상에 있으면서 주어진 최초 및 최종상태를 만족하는 특정 동작 커브를 구하여 원하는 동작으로 삼는다. 이 기법은 성분동작을 선형보간하여 동작을 합성하는 기법과는 다른 접근방법이다. 또한 여러 동작들을 혼합하기 위해서는 동작들간에 위상 (phase)이 서로 대응되어야 하므로, 본 논문에서는 성분 동작의 위상대응성을 고려한 목표지향적 동작합성 기법을 제시한다.

• International Journal of Internet, Broadcasting and Communication
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• v.7 no.2
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• pp.1-8
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• 2015

Tracking of an object in 3D space performed in real-time is a significant task in different domains from autonomous robots to smart vehicles. In traditional methods, specific data acquisition equipments such as radars, lasers etc, are used. Contemporary computer technology development accelerates image processing, and it results in three-dimensional stereo vision to be used for localizing and object tracking in space. This paper describes a system for tracking three dimensional motion of an object using color information in real time. We create stereo images using pair of a simple web camera, raw data of an object positions are collected under realistic noisy conditions. The system has been tested using OpenCV and Matlab and the results of the experiments are presented here.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10b
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• pp.553-555
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• 2000

인체와 같은 다관절체의 운동은 세그먼트 단위로 강체의 특성을 포함하고 있으나, 움직임에 따라 옷의 주름과 같은 잡음과 관절의 변화 등의 비강체의 성질을 가진다. 따라서 잡음과 움직임에 따라 다양한 특징점이 추출되며, 영상 간 특징점의 변화가 심하므로, 대상의 특징을 비교적 정확히 반영하는 대응관계를 가진 특징점을 추출하는 것은 어려운 문제이다. 본 논문에서는 인체와 같은 다관절체의 움직임으로부터 신뢰성 있는 대응관계를 가진 특징점을 추출하기 위한 기법을 제안한다. 또한 쌍 대응(pairwise correspondence)의 문제를 확장하여 특정 동작을 이루는 다수의 프레임에서의 일관성 있는 특징점 대응을 위한 간단한 전략을 제안한다. 이를 통해 정확하고 안정적인 대응관계를 가진 특징점을 추출할 수 있다.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.7 no.2
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• pp.156-162
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• 1995

A numerical method for a 2-D oil boom model considering the flexibility of skirt has been developed The neater is assumed rigid and the skirt is tensioned membrane having a point mass at its end The fluid motion is potential. The kinematic condition which demands the continuity of the displacement is imposed at the joint between the floater and the skirt. The dynamic condition for the point mass is imposed at the bottom end of the skirt. The numerical method is based on the Green's function method in the frame of linear potential theory. It finds it's solution simultaneously from the total system of three equations, integral equation, the equation of motion of the floater and the equilibrium equation of the deformation of the skirt. Integral equation is derived by applying the Green's theorem to radiation potential and Green's function. Proper descretization of those three equations leads to the system of a linear algebraic equation. Due to the flexibility of skirt the motion of floater can be diminished in some range of wave frequency and furthermore the mechanism of resonance of the oil boom can be changed. The motion responses of various oil booms have been compared varying the length of the skirt and the point mass. The numerical method has been validated indirectly from the good correspondence between the motion responses of the flexible skirt model and the rigid skirt model in low frequency limit.