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3D positioning scheme exploiting nano-scale IR-UWB orthogonal pulses
Kim, Nammoon,Kim, Youngok Springer 2011 NANOSCALE RESEARCH LETTERS Vol.6 No.1
<P>In these days, the development of positioning technology for realizing ubiquitous environments has become one of the most important issues. The Global Positioning System (GPS) is a well-known positioning scheme, but it is not suitable for positioning in in-door/building environments because it is difficult to maintain line-of-sight condition between satellites and a GPS receiver. To such problem, various positioning methods such as RFID, WLAN, ZigBee, and Bluetooth have been developed for indoor positioning scheme. However, the majority of positioning schemes are focused on the two-dimension positioning even though three-dimension (3D) positioning information is more useful especially in indoor applications, such as smart space, U-health service, context aware service, etc. In this paper, a 3D positioning system based on mutually orthogonal nano-scale impulse radio ultra-wideband (IR-UWB) signals and cross array antenna is proposed. The proposed scheme uses nano-scale IR-UWB signals providing fine time resolution and high-resolution multiple signal specification algorithm for the time-of-arrival and the angle-of-arrival estimation. The performance is evaluated over various IEEE 802.15.4a channel models, and simulation results show the effectiveness of proposed scheme.</P>
Floor and Motion Classifying Scheme Exploiting Smart-phone for Indoor Movements
Younghoon Kim,Nammoon Kim,Youngok Kim 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.7
In these days, smart-phone becomes a major personal communication device and more and more hardware including various sensors as well as software including various applications tend to be mounted on it. In this paper, we propose a classification scheme that classifies ambulatory movements of the user and the floor where the user exists with a smart-phone. In the proposed scheme, ambulatory movements of the user are classified by exploiting the barometer and the accelerometer, while the GPS data is used to classifies the floor information. With the proposed scheme, various motions, such as walking, stop, up and down motions with elevator or stairs, are distinguished by utilizing the data from the barometer and the accelerometer. When the user enters a building, the building information is confirmed with the GPS information and the smart-phone can classify ambulatory movements and the floor information of the user. An Android application is developed for the performance evaluation of the proposed scheme. The proposed scheme is evaluated with experiments at general building in university and the accuracy of the proposed scheme is more than 94% for floor estimation, although there is still works to improve the estimation of movements.
김남문(Kim, Nammoon),김영억(Kim, Youngok) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.7
본 논문은 승객 위치정보 기반의 지하철 분산대피 안내 시스템을 제안하고자 한다. 최근 지하철 역사는 지하철 승강 장 역할 뿐만 아니라, 환승, 쇼핑몰, 영화관 등의 다양한 편의 시설과 결합하여 대형화, 복잡화 되어 가고 있다. 이러한 지하철 역사의 복잡도 증가에 비해서 비상시를 대비한 대피경로, 대피안내 등의 대비체계는 부족한 실정이다. 이를 해결하기 위하여 현재 지하철에 설치되어 있는 Access Point(AP)와 실제 통계 자료를 이용하여 지하철 각 객차의 전체 승객 수를 추정하고, 추정된 승객 수와 지하철 역사의 출구 정보를 기반으로 각 객차의 승객 대피 경로를 방향 지시등과 스마트폰의 Push 알람을 통해 제공함으로써, 비상 시 가장 위험한 지하철 승객의 신속하고 안전한 대피시스템을 제안하였다. OpenWrt 임베디드 OS 가 설치된 AP를 이용하여 접속자 수를 추정하는 실험을 수행하였으며, 시뮬레이션을 통해 승객 수를 추정한 결과 신뢰구간 파라미터 1? 2? 3澍【 15%, 17% 그리고 23%의 평균 에러율을 갖는 것을 확인하였다. 이를 통해 본 시스템의 가능성을 확인하였다. In this paper, a distributed evacuation system based on the positioning information of subway passengers is proposed. Recently, the subway station is becoming complicated by combining with shopping malls, and movie theaters. Compared to the increasing complexity of subway stations, evacuation systems are less complex(ed note: Please check.). Subway passengers in each cell were estimated to use the access point in the subway cells and statistics information. The evacuation route is provided through a direction indicator and push alarm of a smart phone based on estimated the number of passengers and exit information of the subway station. Based on this schemes, a quick and safe evacuation system of subway passengers was proposed. The number of connection passengers was estimated using AP with OpenWrt embedded OS installed. The average error rate of the number of passenger was confirmed to be 15%, 17% and 23% at the confidence parameter of 1 , 2 , and 3 , respectively, through a simulation. The possibility of the system through a simple experiment was examined.