Browsing by Author "Tang, Yu-Shun"

Now showing 1 - 3 of 3

Nonlinear Analysis of Movement-related Changes in Human Subthalamic Local Field Potentials
(2010)
Wei, Chun-Shu
;
Tsai, Chon-Haw
;
Chiou, Shang-Ming
;
Hseu, Ya-Ting
;
Liu, Ta-Wei
Movement-related changes such as event-related desynchronizationcan (ERD) and event-related synchronization (ERS) can be found in human subthalamic nucleus (STN) with analysis on local field potentials (LFP) recorded from Parkinson's disease (PD) patients. Besides traditional time-frequency (TF) analysis, we introduced nonlinear analysis, bispectral and approximate entropy (ApEn), to measure the signal nonlinear correlation and regularity in neural activities. Movement-related changes were found in the beta band, bicoherence and ApEn, and variation during stationary movement is more available by nonlinear methods. Therefore, we suggest nonlinear analysis for further related studies.
Research of accommodative microfluctuations caused by visual fatigue based on liquid crystal and laser displays
(2014-10-10)
Jeng, Wei-De
;
Ouyang, Yuan
;
Huang, Ting-Wei
;
Duann, Jeng-Ren
;
Chiou, Jin-Chern
Different levels of visual fatigue in the human eye depend on different color-formation methods and image quality. This paper uses the high-frequency component of the spectral power of accommodative microfluctuations as a major objective indicator for analyzing the effects of visual fatigue based on various displays, such as color-formation displays and 3D displays. Also, a questionnaire is used as a subjective indicator. The results are that 3D videos cause greater visual fatigue than 2D videos (p < 0.001), the shutter-type 3D display causes visual fatigue more than the polarized type (p = 0.012), the display of the time-sharing method causes greater visual fatigue than the spatial-formation method (p = 0.008), and there is no significance between various light source modules of displays (p = 0.162). In general, people with normal color discrimination have more visual fatigue than those with good color discrimination (p < 0.001). Therefore, this paper uses the high-frequency component of accommodative microfluctuations to evaluate the physiological stress or strain by overexerting the visual system, and can compare the level of visual fatigue between various displays. (C) 2014 Optical Society of America
The Novel research of Intraocular Pressure Tonometer by Using Inductance sensor
(2012)
Tang, Yu-Shun
;
Jeng, Wei-De
;
Huang, Ting-Wei
;
Ou-Yang, Mang
;
Chiou, Jin-Chern
This article mainly discusses the theoretical derivation and the estimate of the intraocular pressure (IOP) sensor by using inductance. The inductance changes associate with the variation of anterior corneal curvature radius due to the differences of IOP. The value of inductance is transformed by the LC oscillator, and the signal is transmitted by antenna, and finally read by the exterior readout circuit to achieve IOP measuring. The result show that the estimative values of inductance is close to the measured values, and the percentage of inductance variation is about 0.08% per 1 mmHg. Because of the low percentage, it makes much harder to realize readout circuit. In the future, the alteration of structure and material are considered to increase the percentage of varying inductance.