DPA,, ShareLog 3) 4) 2.2 Strino Strino STRain-based user Interface with tacticle of elastic Natural ObjectsStrino 1 Strino ) PC Log-Log (2007 6)

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1 Experimental Evaluation of Convenient Strain Measurement Using a Magnet for Digital Public Art Junghyun Kim, 1 Makoto Iida, 2 Takeshi Naemura 1 and Hiroyuki Ota 3 We present a basic technology that utilizes natural object in the environment and use it as a new and simple interface. In our study we apply strain measurement to an object for constructing an interface. A strain is a small change in length of the object caused by some external force. In many cases, the strain is measured by attaching a strain sensor onto the surface of the object. But, there are problems that it is necessary to adhere for a long time and maintenance is complex. So we have proposed using magnets as compared with adhesive for attaching the strain sensors although the object is limited. In this paper, we evaluate a method to attach the strain sensors using magnets on the bench using in airport. 1. PC Media Art Digital Public ArtDPA 1) PC 2) Digital Public ArtDPA 1 Faculty of Engineering, The Univ. of Tokyo 2 Arts and Sciences, The Univ. of Tokyo 3 Hitachi, Ltd. 1 c 2010 Information Processing Society of Japan

2 DPA,, ShareLog 3) 4) 2.2 Strino Strino STRain-based user Interface with tacticle of elastic Natural ObjectsStrino 1 Strino ) PC Log-Log (2007 6) Log-Log 2 Strino Log-Log. Streaming Bench2008 7) 2 Log-Log L L + L L - LL L ε. ε = L L strain gauge (1) 1 Strino Fig. 1 Art Works of Strino 10) 2 2.5mm 5000 CONTEC AI-1608AYUSB A/D A/D 1ch 100kHz 2 c 2010 Information Processing Society of Japan

3 2 3.2 Fig. 2 Strain Sensor Strino Strino,, A 3 Fig. 3 decision of Sitting ( 3 B) 3 C ( 3 D) cm 3.5cm m 1 σ 1 m 2 σ 2 3 c 2010 Information Processing Society of Japan

4 Table 3 3 How to decideo the threshold from one-man experiment m V V σ V V m 1 σ V V m 1 2σ V V m 1 3σ V V m 1 4σ V V Fig. 4 Measurement of the bench Table 1 Average and standard deviate of motionless experiment Table 2 Average and standard deviate of free motion experiment m V V σ V V m V V σ V V Hz (m 1 -σ 2 ) σ 2 2σ 2 3σ 24σ Fig. 5 Method of judging Sit V 7 0.8V m 1 σ 2 18 m 1 σ 2 19 m 1 2σ c 2010 Information Processing Society of Japan

5 Fig. 6 Hit rate of event of threshold setting 6 6 m 1 2σ ) ) 1 2F ( 7) 7 Fig. 7 Constellation Chair 8 Fig. 8 Interaction of the Constellation Chair Strino Strino LED 44 LED LED AD PC UDP LED PC 8 5 c 2010 Information Processing Society of Japan

6 4 4 Table 4 Number of sitting times using adhesives :m 1 σ :m 1 2σ Table 5 4 Number of sitting times using a magnet :m 1 σ :m 1 2σ Table 6 Hit rate of event of threshold setting m 1 σ 2 m 1 σ 2 m 1 2σ 2 m 1 2σ 2 m 1 3σ 2 m 1 3σ 2 m 1 4σ 2 m 1 4σ 2 () () PC A,B,C,D ABCD m 1-2σ 1 6 c 2010 Information Processing Society of Japan

7 Table 7 7 Hit rate using adhesives and a magnet of a field experiment A A B B C C D D m V V V V V V V V σ V V V V V V V V m 3 σ V V V V V V V V Fig Compare of using magnet and adhesive on field experiment 9 Fig. 9 System 100 1) :, 2, pp. 1-1, (2006.6). 2),,, :, 14 (2009.9) 3) K.Hashimoto : Sharelog:Digital Public Art Interaction by using Suica,In Proc. of ACM SIGCHI International Conference on Advances in Computer Entertainment Technology 2006 (ACE 2006)pp.62, (2006.6). 4) :,,,, (2006.5) 5),, :, 2006,pp ,(2006.9). 6),,, :, 12, 2A3-5, (2007.9). 7 c 2010 Information Processing Society of Japan

8 7),,, : Streaming Bench ( ) 8) : http : // public art.org/airharbor/airharbor.php?pg = top 9) : http : // public art.org/airharbor/ah w orks t 1.php?pg = 14Chair 10),,, :, (A ), vol. 73, no. 729, pp , May c 2010 Information Processing Society of Japan

IPSJ SIG Technical Report Vol.2012-CG-148 No /8/29 3DCG 1,a) On rigid body animation taking into account the 3D computer graphics came

IPSJ SIG Technical Report Vol.2012-CG-148 No /8/29 3DCG 1,a) On rigid body animation taking into account the 3D computer graphics came 3DCG 1,a) 2 2 2 2 3 On rigid body animation taking into account the 3D computer graphics camera viewpoint Abstract: In using computer graphics for making games or motion pictures, physics simulation is