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Kazuyuki Watanabe,Koji Otani,Takuya Nikaido,Kinshi Kato,Hiroshi Kobayashi,Shoji Yabuki,Shin-ichi Kikuchi,Shinichi Konno 대한척추외과학회 2017 Asian Spine Journal Vol.11 No.6
Study Design: Observational cohort study. Purpose: To assess the surgical outcomes of posterior decompression and fusion for cervical myelopathy in patients with athetoid cerebral palsy. Overview of Literature: Patients with athetoid cerebral palsy demonstrate involuntary movements and develop severe cervical spondylosis with kyphosis. In these patients, surgery is often performed at an early age because of myelopathy. A few studies have reported about the long-term outcomes of surgical treatment; however, they contain insufficient information. Methods: From 2003 to 2008, 13 patients with cervical myelopathy due to athetoid cerebral palsy underwent posterior fusion surgery and were included in this study. The Japanese Orthopaedic Association (JOA) score, neck disability index (NDI), C2–7 angle on radiography, and need for additional surgical treatment were examined at 1 and 5 years postoperatively. Results: The mean C2–7 angle was −10.5°±21.1° preoperatively and was corrected to −2.9°±13.5° immediately postoperatively. This improvement was maintained for 5 years. The JOA score was 9.5±2.5 preoperatively and 12.2±1.7 at the 5-year follow-up. NDI was 17±6.9 preoperatively and 16±7.5 at the 5-year follow-up. Patient satisfaction with surgery on a 100-point scale was 62.2±22.5 at the 5-year follow-up. Three patients needed additional surgery for loosening of screws. These results demonstrate good surgical outcomes for posterior fusion at 5 years. Conclusions: Posterior decompression and fusion should be considered a viable option for cervical myelopathy in patients with athetoid cerebral palsy.
Experimental study on reactive switch by using piezoelectric devices
Yuuki Takehana,Kazuyuki Kobayashi,Tomoyuki Okubo,Yousuke Kurihara 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
The keyboard switch is an important for today’ advanced systems. This paper proposes a new type of emulated reactive keyboard switch by using piezoelectric devices. The proposed reactive switch consists of two elements of piezoelectric devices that sensed and actuated by DSP micro controller. We investigate how each reaction force of switches effects to the touch feeling via sensory test. According to results of feeling test, we develop an actual reactive switch for demonstrating reaction force. Validity of proposed reactive switch is verified by actual experimental tests.
A Study on Spin-rate Measurement Using a Uniquely Marked Moving Ball
Sho Furuno,Kazuyuki Kobayashi,Tomoyuki Okubo,Yosuke Kurihara 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
A method is proposed for measuring the spin rate of a ball moving through 3D space. The method uses only one high-speed camera and a uniquely marked ball. Five lines, each one a different color, are painted on the??ball’s equator and on its perpendicular great circle, enabling measurement of both the rotational angular velocity (spin rate) and translational velocity. The proposed measurement algorithm consists of two steps. The first step is to measure the translational velocity, for which we developed a new semi-automatic translational speed measurement algorithm. The second step is to measure the ball spin rate employing a unique marker tracking method using a spin rate estimation algorithm based on a rotation matrix. Simulations and experiments were carried out to show the validity of the method, and reasonable results were obtained.
Development of safety system for electric wheelchair with thermography camera
Tomoyuki Ohkubo,Kazuyuki Kobayashi,Kajiro Watanabe,Yosuke Kurihara 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper describes the development of a safety system for electric wheelchairs applying a thermography camera, laser range finder, and head mounted display. The combination of thermography camera and laser range finder can detect obstacles and/or humans even in the dark. The main problem the thermography camera is the narrow viewing angle. To overcome this problem, we developed a real-time obstacle tracking system that consists of a thermography camera and laser range finder. The combination of devices achieves robust tracking without the time-consuming complicated image processing required in conventional obstacle tracking. To confirm the validity of the proposed approach, we tested the newly developed system in an actual environment.