• Journal of Mechanical Science and Technology
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• 제19권6호
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• pp.1290-1303
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• 2005

In this research, a remote control system has been developed and implemented, which combines autonomous obstacle avoidance in real-time with force-reflective tele-operation. A tele-operated mobile robot is controlled by a local two-degrees-of-freedom force-reflective joystick that a human operator holds while he is monitoring the screen. In the system, the force-reflective joystick transforms the relation between a mobile robot and the environment to the operator as a virtual force which is generated in the form of a new collision vector and reflected to the operator. This reflected force makes the tele-operation of a mobile robot safe from collision in an uncertain and obstacle-cluttered remote environment. A mobile robot controlled by a local operator usually takes pictures of remote environments and sends the images back to the operator over the Internet. Because of limitations of communication bandwidth and the narrow view-angles of the camera, the operator cannot observe shadow regions and curved spaces frequently. To overcome this problem, a new form of virtual force is generated along the collision vector according to both distance and approaching velocity between an obstacle and the mobile robot, which is obtained from ultrasonic sensors. This virtual force is transferred back to the two-degrees-of-freedom master joystick over the Internet to enable a human operator to feel the geometrical relation between the mobile robot and the obstacle. It is demonstrated by experiments that this haptic reflection improves the performance of a tele-operated mobile robot significantly.

• 제어로봇시스템학회논문지
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• 제6권9호
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• pp.796-802
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• 2000

A master-slave system for teleoperation is usually used to control the robor's motion on remote place such as abyss, outer space etc.. When the slave robot is a humanoid one, it can make a better performance if the configuration of the master arm is similar to that of the slave arm and of the human. The master arm proposed in this paper has a type to be put on the human arm, that is, the exoskeleton type, and has a combination of serial joint and parallel mechanism imitating the human's arm structure of muscles and bones, so called hybrid mechanism so that it can follow arm's movement effectively. But it is easy to solve the forward kinematis of the parallel structure because relating equations are implicit functions. In order to solve that, the virtual joint angle corresponding to human arm's joint is introduced and a sequential computation step is employed in calculating virtual joint angles and the posture of the end effector. Also validity is checked up through computational simulation.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.1327-1330
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• 2004

An underwater robotic system has been developed and applied to visual inspection of reactor vessel internals. The Korea Electric Power Robot for Visual Test (KeproVt) consists of an underwater robot, a vision processor-based measuring unit, a master control station and a servo control station. The robot guided by the control station with the measuring unit can be controlled to have any motion at any position in the reactor vessel with $\pm$1 cm positioning and $\pm$2 degrees heading accuracies with enough precision to inspect reactor internals. A simple and fast installation process is emphasized in the developed system. The developed robotic system was successfully deployed at the Younggwang Nuclear Unit 1 for the visual inspection of reactor internals.

• 한국군사과학기술학회지
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• 제11권6호
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• pp.156-163
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• 2008

Future Combat System(FCS), such as unmanned systems that reduce the danger faced by soldiers in the field, are likely to be studied and developed. Soldiers when finding and disposing of mines risk injury and death. Several methods of safe mine retrieval are investigated. In this paper, a mine removal method, which uses a remote controlled robot to get rid of mines using a 4 channel architecture teleoperation method is used. The robot, when in contact with soil and mines, is controlled by a remote control. The feasibility of using teleoperation controlled system to remove mines is demonstrated in this paper. The Matlab-Simulink was used as a tool to simulate mine removal with robots. The force and position of the robot{slave system of 4 channel architecture) and controller(master system of 4 channel architecture) are analyzed when users handle the controller with sinusoidal force.

• 로봇학회논문지
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• 제14권1호
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• pp.50-57
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• 2019

This work presents a design and control method for a flexible robot arm operated by a wire drive that follows human gestures. When moving the robot arm to a desired position, the necessary wire moving length is calculated and the motors are rotated accordingly to the length. A robotic arm is composed of a total of two module-formed mechanism similar to real human motion. Two wires are used as a closed loop in one module, and universal joints are attached to each disk to create up, down, left, and right movements. In order to control the motor, the anti-windup PID was applied to limit the sudden change usually caused by accumulated error in the integral control term. In addition, master/slave communication protocol and operation program for linking 6 motors to MYO sensor and IMU sensor output were developed at the same time. This makes it possible to receive the image information of the camera attached to the robot arm and simultaneously send the control command to the robot at high speed.

• 조명전기설비학회논문지
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• 제22권7호
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• pp.1-6
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• 2008

In industrial fields, human works are being replaced by robots. However, as the use of robots is limited in the process industry where they are operated fixedly, humanoid robots with wide applications need to be developed. Currently a great deal of research is being conducted on humanoid robots with the object of replacing humans in the workplace. However, because of the lack of relevant hardware and difficulty in mechanical parts, only very simple and limited progress is being made. In an effort to overcome these limitations, the purpose of the present study is to develop a kinematical mechanism and a controller. To this end, master arms with 3 degrees-of-freedom for the shoulders and the arms were composed which were able to reproduce human-like motions by simulating the characteristics of joint variables and the trajectory of the end-effector.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1991년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 22-24 Oct. 1991
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• pp.838-843
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• 1991

A telemanipulator that reflects grasping force of the slave gripper to the human operator was implemented in order for manipulation to be more delicate and safe. An industrial robot gripper was used as the slave manipulator. The master manipulator was constructed to make it easy for a human operator to direct the slave and to feel the reflected gripping force. Reflected force was generated by the servomotor of the master. The force signal and position signals of the master and the slave was used to generate driving force signal. Basically position-position type control was used. Miner force feedback is added to improve the performance of the system. Implemented system was tested by colliding two fingers of the slave manipulator, and here switching was used to archive more fast and easy manipulation.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1988년도 한국자동제어학술회의논문집(국제학술편); 한국전력공사연수원, 서울; 21-22 Oct. 1988
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• pp.951-957
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• 1988

A collision-free trajectory planning algorithm is proposed to optimally coordinate two robots working in a common 3-D workspace. Each link of the two robots is modeled as a line segment and by their motion priority, one of the two robots is chosen as the master and the other the slave. And the one-step-ahead minimum distance between the two robots is computed by moving the master to the next location on its specified trajectory. Then the nominal trajectory of the slave is modified such that the distance between the next locations of the master and the slave must be larger than a prespecified allowable minimum distance. Here the weighted sum of the trajectory error and the joint motions of the slave is minimized by using the linear programming technique under the constraints that joint angle and velocity limits are not violated. To show the validity of the proposed algorithm, a numerical example is illustrated by employing a two dof's and a three dof's planar robots.

• 대한지역사회작업치료학회지
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• 제6권1호
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• pp.49-60
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• 2016

목적 : 본 연구는 국내에서 로봇치료가 중재도구로 사용된 연구 사례들을 PICO (Patient, Intervention, Comparison, Outcome) 형식에 따라 체계적으로 정리하여 국내 로봇치료의 연구 현황을 알아보고자 하였다. 연구방법 : 한국학술연구정보서비스(RISS)와 국가전자정보도서관(NDSL) 데이터베이스에서 최근 9년간의 연구를 주요 검색용어 '로봇치료'로 하여 국내 학술지와 학위논문 총 710개의 연구를 검색하였다. 로봇을 치료적 중재도구로 사용한 국내연구 중 원문을 구할 수 있는 연구를 기준으로 최종 15개를 선정하였다. 선정된 연구는 PICO 형식을 통해 체계적으로 정리하여 제시하였다. 결과 : 연구도구의 질적 수준은 근거기반 연구수준 5단계 분류 방법을 사용하였다. 그 중 질적 수준이 3단계 이상인 연구는 13개(86.6%)였다. 로봇치료를 사용한 연구를 중재 분야별로 나눈 결과 언어, 보행, 인지, 발달 그리고 상지의 다섯 가지 영역에 대한 연구가 진행되었음을 알 수 있었다. 결론 : 국내에서 로봇치료는 상지와 하지의 중재를 포함한 언어, 인지, 발달 등의 다양한 영역의 재활을 위해 사용되고 있었다. 본 연구가 국내 로봇치료와 관련된 다양한 영역의 적용에 필요한 기초자료로 활용되기를 바란다.

• 디지털융복합연구
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• 제10권11호
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• pp.613-618
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• 2012

개정된 ICT교육지침에는 알고리즘, 자료구조, 프로그래밍 내용과 같은 컴퓨터과학 요소가 매우 강화되었다. 또한 최근 교육과학기술부는 STEAM 교육을 강조하고 있다. 여기에서 가장 중요한 문제는 "어떠한 방법으로 가르쳐야 하는가?"이다. 즉, 교수학습 콘텐츠의 개발이 필요하다. 그래서 본 논문에서는 레고 마인드스톰 NXT 교육용 로봇을 활용한 스택과 큐 학습 방안을 제시한다. 주된 목표는 로봇이 미로라는 현실적인 구조물을 탐색할 때 스택과 큐가 어떻게 사용되는지를 보여주는 것이다. 교수학습 전략으로는 알고리즘 작성, 순서도, NXT-G 프로그래밍으로 정하였다. 단순한 미로는 왼쪽과 오른쪽 중 어느 한쪽에만 길이 있는 미로이고, 복잡한 미로는 삼거리가 포함된 미로이다. 이 두 개의 미로는 직접 개발하여 제작하였다. 마스터 로봇은 미로의 출구까지 탐색하면서 경로를 스택에 저장한 후, 이 스택을 이용하여 다시 입구까지 되돌아온다. 또한 마스터 로봇은 미로를 탐색하면서 경로를 실시간으로 슬레이브 로봇의 큐에 전달한다. 그 후 슬레이브 로봇은 큐에서 경로를 꺼내어 탐색없이 미로를 주행한다. 로봇의 미로 탐색이라는 미션을 해결하는 과정에서 학습자들은 스택과 큐의 활용 분야를 자연스럽게 이해하게 된다. 이러한 수업을 통해서 학습자들의 논리적인 사고력과 창의력이 향상되고, ICT 교육과 STEAM 교육에도 적용이 가능하리라 기대된다.