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Underlying Control Strategy of Human Leg Posture and Movement
Shinsuk Park 대한기계학회 2004 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.18 No.4
While a great number of studies on human motor control have provided a wide variety of viewpoints concerning the strategy of the central nervous system (CNS) in controlling limb movement, none were able to reveal the exact methods how the movement command from CNS is mapped onto the neuromuscular activity. As a preliminary study of human-machine interface design, the characteristics of human leg motion and its underlying motor control scheme are studied through experiments and simulations in this paper. The findings in this study suggest a simple open-loop motor control scheme in leg motion. As a possible candidate, an equilibrium point control model appears consistent in recreating the experimental data in numerical simulations Based on the general leg motion analysis, the braking motion by the driver's leg is modeled.
Underlying Control Strategy of Human Leg Posture and Movement
Park, Shinsuk The Korean Society of Mechanical Engineers 2004 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.18 No.4
While a great number of studies on human motor control have provided a wide variety of viewpoints concerning the strategy of the central nervous system (CNS) in controlling limb movement, none were able to reveal the exact methods how the movement command from CNS is mapped onto the neuromuscular activity. As a preliminary study of human-machine interface design, the characteristics of human leg motion and its underlying motor control scheme are studied through experiments and simulations in this paper. The findings in this study suggest a simple open-loop motor control scheme in leg motion. As a possible candidate, an equilibrium point control model appears consistent in recreating the experimental data in numerical simulations. Based on the general leg motion analysis, the braking motion by the driver's leg is modeled.
Image-Based Virtual Fixtures for Robotic Cardiac Surgery
Shinsuk Park,Robert D. Howe 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2002 International Journal of Assistive Robotics and Me Vol.3 No.1
We are developing virtual fixtures for the internal mammary artery (IMA) harvest portion of robot-assisted coronary artery bypass graft procedures. A preoperative CT scan is processed to define the location of the IMA. In surgery, the patients anatomy will be registered to the image data, then a virtual fixture will constrain the instruments motions, as commanded by the surgeon, to appropriate paths adjacent to the artery. CT image processing algorithms and registration protocol were developed to extract the artery location of animal models. As a preliminary in vitro test, a virtual fixture was implemented on a commercial surgical robot system, and its effectiveness was tested on phantom models. Results from a dissection task show that execution is faster and more precise than with conventional freehand techniques.
Park, Shinsuk,Kim, Eugene Okayama Univ. Medical School 2009 Acta medica Okayama Vol.63 No.6
<P>Conventionally, the carrying angle of the elbow is measured using simple two-dimensional radiography or goniometry, which has questionable reliability. This study proposes a novel method for estimating carrying angles using computed tomography that can enhance the reliability of the angle measurement. Data of CT scans from 25 elbow joints were processed to build segmented three-dimensional models. The cross-sectional centerlines of the ulna and the humerus were traced from the 3D models, and the angle between 2 vectors formed from the centerlines of the humerus and the ulna was defined as the 'three-dimensional carrying angle.' These angles were compared with those measured by simple radiograph. Two cases of angular deformity were underwent surgery based on this preoperative surgical planning, and the postoperative 3D carrying angles were evaluated using the proposed method. The mean value of the calculated three-dimensional carrying angle was 20.7 degrees +/-3.61, while it was 16.3 degrees +/-3.21 based on simple radiography without statistical difference. Based on the 3D carrying angle estimations, 2 surgical cases of cubitus deformities were planned by comparison with the normal contra-lateral elbow. Postoperative angle estimations confirmed that the corrected angles were nearly identical to the planned angles for both cases. The results of this study showed that the carrying angle can be accurately estimated using three-dimensional CT and that the proposed method is useful in evaluating deformities of the elbow with high reliability.</P>
Application of EEG for Multimodal Human-Machine Interface
Jangwoo Park,Il Woo,Shinsuk Park 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
There are many input modalities for human-machine interface (HMI). Brain-signal that is one of biosignal has been studied as an input modality for HMI. Brain-signal based HMI can help disabled people to communicate with a machine using the brain’s electrical activity. this study is focuses on usability of the EEG-based HMI’s for available tools in real life and possibility of the EEG signal as input modality of multimodal interface. This study attempt to explore the electroencephalogram (EEG) signal measurement and analysis methods related to concentration for multimodal Interface. The experiments have been performed with various tasks, such as self-concentration, self-arithmetic (non-display), self-arithmetic (show display) and eye-closing. EEG signals are recorded while subjects perform each task on Fz, Cz, Pz. The receiver operating characteristic (ROC) curve analysis is to determine the threshold on each task. Rate of distinction range is 50.32% ~ 56.77% with the threshold about self-arithmetic and 71.67%~78.33% with the threshold about eye-closing. There are some meaningful results about threshold, self-arithmetic and eye-close activity. It can be used for brain-machine interface and multi-modal interface.
Force Sensing Resistor를 이용한 인체압력중심 변화 분석
박철(Cheol Park),박신석(Shinsuk Park),김충현(Choong Hyun Kim) 대한전기학회 2014 전기학회논문지 Vol.63 No.12
An experimental investigation of COP(center of pressure) was performed using FSR(force sensing resistor) and force plate. The FSR sensor system is used as effective device to detect the movement of human body in activities of daily living. It has been shown that the FSR provides the trajectories of COP with repeatability and reliability.