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      • Automatic Extraction of Aortic Aneurysm from Thoracic CTA based on Fuzzy-based 3-D Region Growing Method

        Tatsushi Tokuyasu,Takashi Shuto,Kenji Yufu,Shotaro Kanao,Akira Marui,Masashi Komeda 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10

        Computer-Aided Diagnosis (CAD) system that helps medical staffs to diagnose patient"s disease conditions has been used in a variety fields of medicine. For cardiovascular surgery, radiologists manually construct 3-D volume model of patient organ and provide this information to cardiovascular surgeons, therefore automation technique for image processing of building patient 3-D volume model is highly requested from clinical site. The 3-D volume model is used in not only diagnosing patient disease condition, but also making a surgical plan before an operation. In the case of using CAD system for a cardiovascular disease patient, computed tomography angiography (CTA) has been used as the source data that clearly indicates the region of blood flow on the image due to contrast agent. However, sufficient information for the diagnosis is not obtained from CTA, because the regions of aneurysm and aortic wall tissue can not distinguished correctly even using the latest CAD system. Then, this study proposes Fuzzy-based region growing method that enables a computer to have the ability of reading radiogram. We focused on the skill of reading radiogram of experienced doctors, because they know the boundary line between aneurysm and aortic wall tissue on CTA image. Hence, Fuzzy inference has been employed to express doctor"s skill of reading radiogram and used as the growing criteria. The proposed method is applied to one patient CTA data and its result is shown and discussed in this paper.

      • Spasticity Mathematical Modelling in Compliance with Modified Ashworth Scale and Modified Tardieu Scales

        Noor Ayuni Che Zakaria,Takashi Komeda,Cheng Yee Low,Fazah Akhtar Hanapiah,Kaoru Inoue 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10

        The aim of this work is to formulate a spasticity symptoms-oriented model, in terms of its capability to consistently emulate unidirectional and velocity-dependent spasticity symptoms, based on a Modified Tardieu Scale (MTS). Spasticity stiffness can be simulated using two dynamic equations expressing 1) muscle tone catch during passive stretching at different velocities and 2) resistance through Range Of Motion (ROM). Muscle tone is proportionate to velocity; where muscle resistance is constant until reaching a certain angular velocity. Following different Modified Ashworth Scale (MAS) levels, muscle resistance can occur at varying degrees through the ROM. The simulated spasticity of MAS 1+, based on the developed model, shows a strong positive linear correlation coefficient with average r = 0.7414 for fast forearm extension. The derived model will be used to develop new principles of variable stiffness actuation in an upper limb part-task trainer that is able to emulate upper limb spasticity symptoms.

      • Upper-Limb Rehabilitation Exercises Using Haptic Device System

        Yoshiyuki Takahashi,Takafumi Terade,Kaoru Inoue,Yuko Ito,Hokyoo Lee,Takashi Komeda 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2003 International Journal of Assistive Robotics and Me Vol.4 No.2

        We have applied a haptic device to the rehabilitation tool and made efforts to integrate the motion and sensory therapy, in order to avoid boredom that the patients usually feel. This rehabilitation tool system consists of a haptic device, a display, a computer, and software for training. When the user moves the grip, the haptic device provides a virtual force and it can either assists the movement of the arm or work against it. We have carried out a preliminary experiment with young and middle age group and elderly group. It aims to confirm the functionality of this system and to collect the reference data for the evaluation of the upper-limb disability. The results of our experiment show that the system could be used to evaluate the patient"s ability of upper-limb motion.

      • KCI등재

        햅틱 장치를 이용한 상지 운동기능 장애인의 재활치료에 관한 기초 실험

        이호규(Ho Kyoo Lee),김영탁(Young Tark Kim),高橋良至(Yoshiyuki Takahashi),三好扶(Tasuku Miyoshi),鈴木禎(Keisuke Suzuki),米田隆志(Takashi Komeda) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.5

        상지 운동기능 장애인의 재활치료에 대한 지속적인 관심과 훈련의 정량적인 평가가 요구되고 있다. 이러한 문제를 해결하기 위해서 햅틱 장치를 개발했다. 피험자가 햅틱 장치의 손잡이를 움직일 때, 가상의 힘을 제시하여 그들의 동작에 대해 어시스트력이나 항력을 제시할 수 있다. 개발한 상지 운동훈련 프로그램과 시스템의 유효성을 검토하기 위해, 5 명의 운동기능 장애인을 대상으로 직선동작 훈련프로그램을 수행할 때의 손잡이 위치, 수행 속도, 손잡이의 오차 및 상지의 EMG 신호를 측정하였다. 5 명의 피험자의 손잡이의 궤적 및 EMG 활동이 유사함을 보였다. 이러한 결과는 가상 현실의 힘을 손잡이에 제시함으로써 EMG 활동이 증가하였다고 볼 수 있다. 본 실험의 결과, 객관적이며 정량적인 상지 재활치료 시스템의 개발 및 평가 방법이 시사되었다. Rehabilitation exercises must maintain a patient’s interest and permit a quantitative evaluation of the rehabilitation. We have developed a haptic-device system. When users move a grip, the haptic device provides a virtual force that either assists the movement of their arm or working against it. To investigate the functional effect of this system in a rehabilitation program, we used for five subjects with motor-function disorders and measured the grip position, velocity, force exerted on the grip, and EMG activities during a reaching task of one subject. The accuracy of the grip position, velocity and trajectories patterns were similar for all the subjects. The results suggested that the EMG activities were improved by applying the virtual force to the grip. These results can be used for the development of rehabilitation programs and evaluation methods.

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