Browsing by Author "Lu, Che-Yen"

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Autonomous Light Control by Wireless Sensor and Actuator Networks
(2010-06-01)
Yeh, Lun-Wu
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Lu, Che-Yen
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Kou, Chi-Wai
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Tseng, Yu-Chee
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Yi, Chih-Wei
Recently, wireless sensor and actuator networks (WSANs) have been widely discussed in many applications. In this paper, we propose an autonomous light control system based on the feedback from light sensors carried by users. Our design focuses on meeting users' preferences and energy efficiency. Both whole and local lighting devices are considered. Users' preferences may depend on their activities and profiles and two requirement models are considered: binary satisfaction and continuous satisfaction models. For controlling whole lighting devices, two decision algorithms are proposed. For controlling local lighting devices, a surface-tracking scheme is proposed. Our solutions are autonomous because, as opposed to existing solutions, they can dynamically adapt to environment changes and do not need to track users' current locations. Simulations and prototyping results are presented to verify the effectiveness of our designs.
iLamp: A Sensor-Enhanced Lamp with Surface-Tracking Capability Based on Light Intensity
(2009)
Yeh, Lun-Wu
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Lu, Che-Yen
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Lin, Yu-Hsuan
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Liao, Jia-Liang
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Tseng, Yu-Chee
The iLamp(1) system is a sensor-enhanced desk lamp with surface-tracking capability based on received light intensity. It consists of two components: lamp and bookmark. The bookmark is a ZigBee-enabled sensor node that can report its sensed light intensity to the lamp with a user-friendly interface and two-way communication capability. The lamp can use its LEDs to locate user's reading surface to which the bookmark is attached, move toward the surface, and further tune its luminous intensity to meet user's preference. We develop the geometrical model for surface tracking. iLamp demonstrates a new centimeter-level location-tracking system using light intensity alone without other extra media or devices.