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Paper Abstract and Keywords
Presentation 2022-05-27 10:08
Experiment for indoor positioning system based on retraining method of signal strength
Masaaki Yamamoto, Hiromitsu Nakagawa, Shigenori Matsumoto, Hiroyuki Kuriyama (Hitachi) SeMI2022-11
Abstract (in Japanese) (See Japanese page) 
(in English) Covid-19 is continuing to spread around the world. Office workers therefore work in several sites to balance work and prevetation of its. A positioning system for estimating worker’s positions is attracting considerable attention. Given this background, we propose a machine-learning based positioning system. In this system, a positioning model is generated from the training data measured by smartphones. The model estimates a worker’s position from the test data. When the training data and the test data were measured by using different types of smartphones, a positioning error increased. In addition, a different holding state of smartphone increased the error, too. To reduce the error, we developed a positioning system to update the training data according to the holding states and the types of smartphones. We conducted an experiment for three month with 187 employees to evaluate RMSE (Root Mean Square Error) of the positioning system. When using different holding states and the type of smartphone, RMSE of the system was reduced to 2.16 m from 4.45 m.
Keyword (in Japanese) (See Japanese page) 
(in English) Indoor positioning / Signal strength / Retraining / Smartphone / / / /  
Reference Info. IEICE Tech. Rep., vol. 122, no. 46, SeMI2022-11, pp. 49-52, May 2022.
Paper # SeMI2022-11 
Date of Issue 2022-05-19 (SeMI) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee SeMI IPSJ-DPS IPSJ-MBL IPSJ-ITS  
Conference Date 2022-05-26 - 2022-05-27 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To SeMI 
Conference Code 2022-05-SeMI-DPS-MBL-ITS 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Experiment for indoor positioning system based on retraining method of signal strength 
Sub Title (in English)  
Keyword(1) Indoor positioning  
Keyword(2) Signal strength  
Keyword(3) Retraining  
Keyword(4) Smartphone  
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1st Author's Name Masaaki Yamamoto  
1st Author's Affiliation Hitachi Ltd. (Hitachi)
2nd Author's Name Hiromitsu Nakagawa  
2nd Author's Affiliation Hitachi Ltd. (Hitachi)
3rd Author's Name Shigenori Matsumoto  
3rd Author's Affiliation Hitachi Ltd. (Hitachi)
4th Author's Name Hiroyuki Kuriyama  
4th Author's Affiliation Hitachi Ltd. (Hitachi)
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Speaker Author-1 
Date Time 2022-05-27 10:08:00 
Presentation Time 18 minutes 
Registration for SeMI 
Paper # SeMI2022-11 
Volume (vol) vol.122 
Number (no) no.46 
Page pp.49-52 
#Pages 4 
Date of Issue 2022-05-19 (SeMI) 

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