Showing papers by "Dongsoo Han published in 2015"
TL;DR: A sound-based indoor and outdoor environment detection method to realize seamless positioning handover for in-and-outdoor integrated positioning systems using a special chirp sound probe propagate by a speaker of a mobile device and collected back through a microphone of the device.
25 citations
Patent•
23 Nov 2015TL;DR: In this paper, an automated WLAN radio map construction method and system is presented, which includes: collecting WLAN fingerprints obtained by mobile devices in an indoor space, machine-learning a learning model which is generated based on a state diagram in which divided areas of an indoor map are expressed by location states, arranging the collected fingerprints in corresponding location states and storing a result of the arranging.
Abstract: An automated WLAN radio map construction method and system is provided. The automated WLAN radio map construction method includes: collecting WLAN fingerprints obtained by mobile device in an indoor space, machine-learning a learning model which is generated based on a state diagram in which divided areas of an indoor map are expressed by location states, arranging the collected WLAN fingerprints in corresponding location states, and storing a result of the arranging. Accordingly, collection locations of WLAN fingerprints collected in a plurality of unspecific smartphones without reference location information such as GPS signals can be automatically labeled.
6 citations
TL;DR: The adaptive hybrid filter significantly outperformed the basic Kalman filter, and a particle filter in the performance evaluation at three test places: a Library and N5 building, KAIST, Daejeon, and an E-mart mall, Seoul.
6 citations
TL;DR: It is expected that this technology will be utilized as a core technology that can protects safety and human life of the public by providing data for rescuing quickly buried persons in cases of national disasters for future.
Abstract: When the disaster like earthquake in urban area occur, due to the collapse accidents for subway, tunnel space with buildings or underground area, enormous property and human damage are happened. Specially, since it is difficult to identify survived status of humans within collapsed debris and accurately buried locations of the humans, inputs of considerable time and manpower for rescuing them are required. Besides, secondary damage can be occurred by additional collapses. The aim of this study is to propose a stochastic location positioning method that enables to provide aid information by determining locations of mobile devices for buried persons in 2-D plane using wireless communication technologies. This study selected a detection method for buried persons based on Wi-Fi signal, and identified characteristics of signal strengths by distance unit. Using these methods, a stochastic location detection model in 2-D plane was built. It is expected that this technology will be utilized as a core technology that can protects safety and human life of the public by providing data for rescuing quickly buried persons in cases of national disasters for future.
2 citations