Vol. 49 No. 6 1932 1941 (June 2008) RFID 1 2 RFID RFID RFID 13.56 MHz RFID A Experimental Study for Measuring Human Activities in A Bathroom Using RFID Ryo Onishi 1 and Shigeyuki Hirai 2 A bathroom is one of the spaces we use everyday. There are some applications in a bathroom, for instance, healthcare, relaxation, security for bathing accidents. Our research is focusing on a bathroom toward a smarthome as an ubiquitous computing environment, and we have made some bath systems with a bathtub. For completing a bathroom as a ubiquitous environment, we propose a method which measure bather s actions by items equipped RFIDs read from outside of bathroom. This paper describes fundamental experiments for responses and functions of RFID, and for time intervals that people have or hold items in a bathroom. This paper also describes investigations for the availability of RFID in a bathroom. According to result of experiments, 13.56 MHz RFID with anti-collision function is basically possible to apply for our purpose, and some issues are cleared. 1. 1) 3) 4) RFID 5) 8) 9) 11) 1 1 12) 1 Division of Science, Graduate School of Kyoto Sangyo University 2 Faculty of Computer Science and Engineering, Kyoto Sangyo University 1932 c 2008 Information Processing Society of Japan
1933 RFID RFID RFID RFID RFID RFID RFID RFID 2 RFID 3 RFID 4 RFID 5 6 RFID 7 2. RFID 9) 10) 11) 12) RFID RFID RFID ID 12) RFID Weiser 4) RFID 2 1 RFID 2 1 RFID RFID 6),7) RFID RFID 17) RFID 2 RFID
1934 RFID 4 5 2 3 3. 4 5 RFID 3.1 1 YAMAHA AX1616 1 2 2 1 3.2 RFID RFID 134.2 khz 13.56 MHz 13.56 MHz ISO-15693 Welcat EFG-400-01 2 Texas Instruments 3 134.2 khz Texas Instruments S2000 4 5 1 Fig. 1 The bathroom for experiments. 2 RFID 13.56 MHz Fig. 2 RFID reader for experiments (13.56 MHz). S2000 2 2 EFG-400-01 2 1 S2000 S2000 EFG-400-01 1
1935 RFID Fig. 3 3 RFID 10 RFID tags for experiments. a) Square type, b) Rectangular type. Fig. 6 6 a) b) c) d) e) Bath tools equipped RFID tag. a) Washbowl, b) Soap dish, c) Shampoo bottle, d) Shower head, e) Chair. 4 RFID 134.2 khz Fig. 4 RFID reader for experiments (134.2 khz). 5 RFID 10 a) b) Fig. 5 RFID tags for experiments (134.2 khz). a) Card type, b) Glass type. 2 2 13) 6 3.3 RFID 3.1 4 3.2 2 PC CPU: Core 2 Duo/2.13 GHz OS: WindowsXP 2GB S2000 4 EFG-400-01 2 RS232C C++ 7 ID ID 7 ON/OFF
1936 RFID 4. 3 PC ID PC 4.1 134.2 khz RFID S2000 500 8 8 143.5 ms 144 ms 134.2 khz RFID 150 ms RFID 7 Fig. 7 Software for measuring bathing activities. ID ID ID 4.2 13.56 MHz RFID EFG-400-1 1 10 500 9 9 450 ms 3 5
1937 RFID 10 Fig. 10 Arrangement of tags. 8 Fig. 8 134.2 khz Response time of 134.2 khz tags. 11 13.56 MHz Fig. 11 Response time of 13.56 MHz tags with/without water (Arranged tags). 9 13.56 MHz Fig. 9 Response time of plural 13.56 MHz tags simultaneously. 9 10 600 ms 4.3 13.56 MHz RFID EFG-400-1 4.1 0.6 mm RFID 13.56 MHz 1cm 2cm 10 500 11
1938 RFID 600 ms 1 2cm 2 1,200 ms 12 13.56 MHz Fig. 12 Response time of 13.56 MHz tags with/without water (Random arranged tags). 400 ms 500 12 10 12 11 12 11 12 12 4.4 4.1 134.2 khz RFID 150 ms 1 4.2 4.3 13.56 MHz 5. 5.1 4 1 16 20 8 1 30 1 40 1 3 50 1 60 1 10 13 15 1 3 12 16 13 2,000 ms 4 RFID 600 ms 1 1 1 2
1939 RFID 1 Table 1 Items and actions. 5.2 1 15 14 1 2,249 ms 430 ms 1 5 12) 15 1 6. RFID 13 Fig. 13 Durations of using items. 1,200 ms b) b) c) 2,000 ms 600 ms 4 5 4 5 RFID 134.2 khz RFID 1 RFID 150 ms
1940 RFID 13.56 MHz 5 13.56 MHz RFID 4 0.6 mm 600 ms 600 ms 4 1 RFID 3 3 RFID 5 2 3 2 134.2 khz RFID RFID 13.56 MHz RFID UHF 17) KILL RFID 5 RFID RFID 7. RFID RFID 13.56 MHz RFID
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