http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
허근섭,이춘영 제어로봇시스템학회 2015 제어로봇시스템학회지 Vol.21 No.2
근래에 들어서 노인인구와 장애인구의 지속적인 증가로 인해 재활용 로봇 산업이 지속적인 관심을 받고 있다. 특히 재활 로봇은 환자의 삶의 질 향상과 밀접한 관계가 있고, 인간의 기능을 보조하는 시스템 기술로 로봇공학과 밀접한 관계가 있는 분야이므로 더욱 주목받고 있다. 본 논문에서는 현재 활발히 연구가 진행되고 있는 다양한 재활 로봇의 기술 분류와 공개된 시스템의 개발현황을 소개하며 시스템들의 특징을 간략하게 소개하였다. 재활 로봇은 치료 목적 운동에 따라 다양한 형태로 개발될 수 있으며, 실제 상용화된 제품들이 있지만 임상적 효능과 실제 사용성 평가와 관련한 연구가 부족한 실정이다. 실사용자 및 의료계와 지속적인 협력으로 지속적인 기술 개발의 필요성이 요구될 것으로 전망된다.
Motion Control of Bicycle-Riding Exoskeleton Robot with Interactive Force Analysis
허근섭,이상룡,곽문규,박철우,김규만,이춘영 한국정밀공학회 2015 International Journal of Precision Engineering and Vol.16 No.7
Exoskeleton robots are used to augment human power to perform difficult tasks. These robots can generate eternal load on human muscles as training devices. In this paper, a lower-limb training device using exoskeleton is developed for muscle power augmentation during cyclic motion. A control system determines augmenting power on the human leg during pedaling motion based on the calculation of muscle activity timing. The resulting power of the exoskeleton assists cycling motion as a rehabilitation system or applies mechanical load on the leg muscles as a training system. Measurement of interaction force by the load cell on each pedal determines admittance control signal. Experiments to assist bicycle riding motion using the developed exoskeleton were conducted. From the interaction force analysis, the sources of errors in the motion control are found, and the application-specific problems are discussed. Given that the exoskeleton robot can control hip and knee joint independently, the proposed system can be extended for assisting various motions in daily life, including walking rehabilitation.
허근섭(Geun Sub Heo),강오현(Oh Hyun Kang),이상룡(Sang Ryong Lee),이춘영(Choon-Young Lee) 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.21 No.6
In this paper, we designed and tested an ankle joint mechanism for a gait rehabilitation robot. Gait rehabilitation programs are designed to improve the natural leg motion of patients who have lost their walking capabilities by accident or disease. Strengthening the muscles of the lower-limbs and stimulation of the nervous system corresponding to walking helps patients to walk again using gait assistive devices. It is an obvious requirement that the rehabilitation system’s motion should be similar to and as natural as the normal gait. However, the system being used for gait rehabilitation does not pay much attention to ankle joints, which play an important role in correct walking as the motion of the ankle should reflect the movement of the center of gravity (COG) of the body. Consequently, we have designed an ankle mechanism that ensures the safety of the patient as well as efficient gait training. Also, even patients with low leg muscle strength are able to operate the ankle joint due to the direct-drive mechanism without a reducer. This safety feature prevents any possible adverse load on the human ankle. The additional degree of freedom for the roll motion achieves a gait pattern which is similar to the normal gait and with a greater degree of comfort.
가속도센서와 각속도센서를 이용한 특정 비정상보행에 관한 연구
허근섭(Geun Sub Heo),양승한(Seung Han Yang),이상룡(Sang Ryong Lee),이종규(Jong Gyu Lee),이춘영(Choon-Young Lee) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.11
Recently, technologies to help the elderly or disabled people who have difficulty in walking are being developed. In order to develop these technologies, it is necessary to construct a system that gathers the gait data of people and analysis of these data is also important. In this research, we constructed the development of sensor system which consists of pressure sensor, three-axis accelerometer and two-axis gyro sensor. We used k-means clustering algorithm to classify the data for characterization, and then calculated the symmetry index with histogram which was produced from each cluster. We collected gait data from sensors attached on two subjects. The experiment was conducted for two kinds of gait status. One is walking with normal gait; the other is walking with abnormal gait (abnormal gait means that the subject walks by dragging the right leg intentionally). With the result from the analysis of acceleration component, we were able to confirm that the analysis technique of this data could be used to determine gait symmetry. In addition, by adding gyro components in the analysis, we could find that the symmetry index was appropriate to express symmetry better.
허근섭(Geun Sub Heo),이상룡(Sang Ryong Lee),신진호(Jin-Ho Shin),이춘영(Choon-Young Lee) 제어로봇시스템학회 2012 제어·로봇·시스템학회 논문지 Vol.18 No.11
In this paper, we proposed a method for vehicle monitoring with trajectory reconstruction. For safety, it is important to monitor the driving habit of driver. Every year, many accidents occur due to the reckless driving of the driver. Continuous monitoring of the status of commercial vehicles is needed for safety through the entire path from start point to the destination. To monitor the reckless driving, we try to monitor the trajectory of the vehicle by using vehicle"s lateral acceleration data. Compared with steering angle and lateral acceleration, these resemble each other. So, we find the relationship of steering angle and acceleration, and find the global direction of vehicle. We find the position of non-GPS section with EKF (External Kalman Filter) and reconstruct the whole trajectory during vehicle driving.
허근섭(Gun Sup Hhu),배기만(Ki Man Bae),이상룡(Sang-Ryong Lee),이춘영(Choon-Young Lee) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.6
In this paper, we proposed an algorithm to detect aggressive driving status by analysing six kinds of driving patterns, which was achieved by comparing for the feature vectors using mahalanobis distance. The first step is to construct feature matrix of 6×2 size using frequency response of the time-series accelerometer data. Singular value decomposition makes it possible to find the dominant eigenvalue and its corresponding eigenvector. We use the eigenvector as the feature vector of the driving pattern. We conducted real experiments using three drivers to see the effects of recognition. Although there exists differences from individual drivers, we showed that driving patterns can be recognized with about 80% accuracy. Further research topics will include the development of aggressive driving warning system by improving the proposed technique and combining with post-processing of accelerometer signals.
이상룡,허근섭,강오현,이춘영,Lee, Sang-Ryong,Heo, Geun-Sub,Kang, Oh-Hyun,Lee, Choon-Young 제어로봇시스템학회 2011 제어·로봇·시스템학회 논문지 Vol.17 No.3
In this paper, we proposed a technique to recognize three states in stance phase of gait cycle. Walking assistive devices are used to help the elderly people walk or to monitor walking behavior of the disabled persons. For the effective assistance, they adopt an intelligent sensor system to understand user's current state in walking. There are three states in stance phase; Loading Response, Midstance, and Terminal Stance. We developed a foot pressure sensor using 24 FSRs (Force Sensing/Sensitive Resistors). The foot pressure patterns were integrated through the interpolation of FSR cell array. The pressure patterns were processed to get the trajectories of COM (Center of Mass). Using the trajectories of COM of foot pressure, we can recognize the three states of stance phase. The experimental results show the effective recognition of stance phase and the possibility of usage on the walking assistive device for better control and/or foot pressure monitoring.
박근영,허근섭,이상룡,이춘영,Park, Keun Young,Heo, Guen Sub,Lee, Sang Ryong,Lee, Choon Young 대한임베디드공학회 2008 대한임베디드공학회논문지 Vol.3 No.3
Mobile robots can offer services like intelligent monitoring in an indoor environment using network connection with remote users. In this paper, we designed and developed a networked security robot system with various sensors, such as flame detector, gas detector, sound monitoring module, and temperature sensor, etc. The robot can be accessed through a web service and the user can check the status of the environment. Using ADAMS software, we defined the motor specification for a worst-case condition of climbing over a obstacle. We applied the robot system in monitoring office condition.