Browsing by Author "Liu, Yen-Chen"

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An EOG-Based Automatic Sleep Scoring System and Its Related Application in Sleep Environmental Control
(2014-01-01)
Kuo, Chih-En
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Liang, Sheng-Fu
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Lee, Yi-Chieh
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Cherng, Fu-Yin
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Lin, Wen-Chieh
Human beings spend approximately one third of their lives sleeping. Conventionally, to evaluate a subjects sleep quality, all-night polysomnogram (PSG) readings are taken and scored by a well-trained expert. Unlike a bulky PSG or EEG recorder on the head, the development of an electrooculogram (EOG)-based automatic sleep-staging system will enable physiological computing systems (PhyCS) to progress toward easy sleep and comfortable monitoring. In this paper, an EOG-based sleep scoring system is proposed. EOG signals are also coupling some of sleep characteristics of EEG signals. Compared to PSG or EEG recordings, EOG has the advantage of easy placement, and can be operated by the user individually at home. The proposed method was found to be more than 83% accurate when compared with the manual scorings applied to sixteen subjects. In addition to sleep-quality evaluation, the proposed system encompasses adaptive brightness control of light according to online monitoring of the users sleep stages. The experiments show that the EOG-based sleep scoring system is a practicable solution for homecare and sleep monitoring due to the advantages of comfortable recording and accurate sleep staging.
Development of an EOG-Based Automatic Sleep-Monitoring Eye Mask
(2015-11-01)
Liang, Sheng-Fu
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Kuo, Chin-En
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Lee, Yi-Chieh
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Lin, Wen-Chieh
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Liu, Yen-Chen
Health care researchers have recently developed several home-based sleep monitoring systems and mobile applications that support healthy sleep by monitoring a user\'s sleep environment, activities, or sleep quality. This study describes the design and evaluation of an electrooculogram (EOG)-based system for an automatic sleep monitoring. Compared with polysomnogram or electroencephalogram recordings, EOG has the advantage of easy placement and can be operated by the users themselves. We also design an intelligent eye mask that is user friendly for measuring sleep stage and quality. Two user experiments were carried out to demonstrate that the proposed system produces valid measurements of sleep stage and sleep quality and has good usability and reliability while not disturbing sleep significantly. These findings suggest that our system can also be applied to long-term sleep monitoring or sleep environment control to improve the user\'s sleep quality and make sleep more comfortable.
Simulation and analysis of synchronisation and engagement on manual transmission gearbox
(2007)
Liu, Yen-Chen
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Tseng, Ching-Huan
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機械工程學系
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Department of Mechanical Engineering
This paper presents a dynamic simulation and analysis model of the synchroniser, which is mainly used to avoid the abnormal impact during shifting in a Manual Transmission (MT) gearbox. Because the complicated mechanism and random engagement of the synchroniser occur in a short time, it is difficult to realise the synchronisation process by experiment. Using ADAMS(TM), not only the entire shift process but also two minor phase modules, separate from the entire shift process, can all be constructed to realise the synchronised action and random meshing between the sleeve and the clutch gear. After verifying the results from the simulation model, the paper discusses the influence of cone surface abrasion on synchronisation and the random meshing process. The results described here can help to understand the synchronisation process as well as it provides a way for improving two major demands, vehicle operational comfort and the lifespan of the synchroniser in a MT gearbox.