By Hendrik Richter, Sebastian Löhmann, Alexander Wiethoff (auth.), David V. Keyson, Mary Lou Maher, Norbert Streitz, Adrian Cheok, Juan Carlos Augusto, Reiner Wichert, Gwenn Englebienne, Hamid Aghajan, Ben J. A. Kröse (eds.)
This publication constitutes the refereed court cases of the second one foreign Joint convention on Ambient Intelligence, AmI 2011, held in Amsterdam, The Netherlands, in November 2011.
The fifty eight revised complete papers provided have been conscientiously reviewed and chosen from various submissions. The papers conceal quite a lot of themes corresponding to haptic interfaces, clever sensing, clever environments, novel interplay applied sciences, affecting human behaviour, privateness and belief, panorama and ambient assisted living.
Read Online or Download Ambient Intelligence: Second International Joint Conference on AmI 2011, Amsterdam, The Netherlands, November 16-18, 2011. Proceedings PDF
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Additional info for Ambient Intelligence: Second International Joint Conference on AmI 2011, Amsterdam, The Netherlands, November 16-18, 2011. Proceedings
Since there are four unknown quantities (x, y, z and t), at least four receiving sensors are required in order to solve the following equations: 34 H. Sunaga et al. Unknown time of transmission Ultrasonic receiving unit Ultrasonic receiving sensors t t+t1 t+t2 t+t3 t：Propagation time (not detectable) ti：Delay time beyond t(detectable) Unknown:(x, y, z)and t Ultrasonic transmitter Fig. 2. 3, which illustrates the three components of the positioning system: the ultrasonic receiving unit, the ultrasonic transmitters (#1, #2), and the signal processing PC used for position calculation.
This enables the system to distinguish each individual ultrasonic transmitter that is installed on each positioning object. 4. The count starts when the ultrasonic receiving unit sends a trigger signal to the ultrasonic transmitter causing it to emit an ultrasonic signal. The count values are then stored in the FPGA in the receiving unit when the associated sensor connected to the receiving circuit receives the ultrasonic signal. These values are sent to the PC via the H8 microcomputer which calculates the delay times that are then used for the positioning calculations.
The main feature of our system, developed and presented last year, is that it does not require synchronization between the transmitting and receiving units. This paper describes a system for accommodating multiple moving objects and expanding positioning area. Two techniques, the allocation of a specific ID to each positioning object and the use of a virtual receiving point for ultrasonic signals, were investigated in order to realize the required functions and make the proposed system more practical.