Browsing by Author "Liao, Jia-Liang"

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Development of Wireless Sensor Module and Network for Temperature Monitoring in Cold Chain Logistics
(2012)
Li, Chen-Ming
;
Nien, Chin-Chung
;
Liao, Jia-Liang
;
Tseng, Yu-Chee
;
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In this paper, a wireless sensor module (WSM) and network used for cool box temperature monitoring in cold chain logistics is presented. The proposed WSM is implemented by integrating mainly a wireless microcontroller JENNIC 5418 based on IEEE 802.15.4 standard with a thermocouple sensing converter MAX31855. The transmitter power and sensitivity of the proposed module are 2.5 dBm and -95 dBm respectively, and the temperature range/resolution of the sensing converter is -40 similar to 125 degrees C/0.25 degrees C. In order to demonstrate the communication quality of the proposed WSM, the point-to-point link quality indication (LQI) has been measured in a 20-foot cargo container filled up with the watered Styrofoam boxes. Furthermore, cool box temperature monitoring and cargo container position tracking regularly at remote-end are demanded for preventing the food from perishing under transportation in cold-chain logistics. Therefore, the access point (coordinator) of the wireless sensor network integrated with the GPS and 3G communication system is considerable, and it has been developed in our project.
iLamp: A Sensor-Enhanced Lamp with Surface-Tracking Capability Based on Light Intensity
(2009)
Yeh, Lun-Wu
;
Lu, Che-Yen
;
Lin, Yu-Hsuan
;
Liao, Jia-Liang
;
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.