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Ball Tracking System for Tongue Disorder Patient: Signal Characteristic of Different Sized Balls
Sang-Hyo Arman Woo,송병섭,유재연 대한의용생체공학회 2012 Biomedical Engineering Letters (BMEL) Vol.2 No.4
Purpose With an increased number of tongue disorder patients, the demand for new devices to treat tongue disorder is rapidly increasing. In this paper, a novel ball type treatment device is proposed: patient places a ball in their mouth to exercise muscles, and the system senses the acceleration of the ball. Methods The ball has the ability to measure tri-axial acceleration and is packaged in biocompatible silicone. Performance of the ball was calibrated with a laser vibrometer that works as a vibration and displacement meter. The measured signals were analyzed by time-frequency analysis such as short time fourier transform (STFT), wavelet transform (WT), and multiple signal classification (MUSIC) spectrum, and which were compared with each other. Results Based on signal analysis, the signal characteristics of the large and small balls were compared. Simple in vivo experiments were conducted and showed feasibility to measure the acceleration of the ball. From the experiments, peak and valley values of ball diameter 19 mm were showed as (x-axis:14.13±4.79, y-axis: 6.12±0.96, Z-axis: 13.38±5.65 mm/s2). Conclusions The proposed system showed feasibility to treat tongue disorder. The system can be combined with a game to increase motivation to practice.
An Optimized Time-synchronization Method for Simulator Interworking
Kwon, Jaewoo,Kim, Jingyu,Woo, Sang Hyo Arman Korea Multimedia Society 2019 멀티미디어학회논문지 Vol.22 No.8
In this paper, we discuss an optimization approach for time-synchronizations in networked simulators. This method is a sub-technology that is required to combine heterogeneous simulators into a single simulation. In previous time-synchronization studies, they had built a network system among networked simulators. The network system collects network packets and adds time-stamps to the networked packets based on the time that occurs in events of simulation objects in the individual simulators. Then, it sorts them in chronological order. Finally, the network system applies time-synchronization to each simulator participating in interworking sequentially. However, the previous approaches have a limitation in that other participating simulators should wait for while processing an event in a simulator in a time stamp order. In this paper, we attempt to solve the problem by optimizing time-synchronizations in networked simulation environments. In order to prove the practicality of our approach, we have conducted an experiment. Finally, we discuss the contributions of this paper.