WiMorse: a contactless Morse code text input system using ambient WiFi signals

International audienceRecent years have witnessed advances of Internet of Things (IoT) technologies and their applications to enable contactless sensing and human-computer interaction in smart homes. For people with Motor Neurone Disease (MND), their motion capabilities are severely impaired and they have difficulties interacting with IoT devices and even communicating with other people. As the disease progresses, most patients lose their speech function eventually which makes the widely adopted voice-based solutions fail. In contrast, most patients can still move their fingers slightly even after they have lost the control of their arms and hands. Thus we propose to develop a Morse code based text input system, called WiMorse, which allows patients with minimal single-finger control to input and communicate with other people without attaching any sensor to their fingers. WiMorse leverages ubiquitous commodity WiFi devices to track subtle finger movements contactlessly and encode them as Morse code input. In order to sense the very subtle finger movements, we propose to employ the ratio of the Channel State Information (CSI) between two antennas to enhance the Signal to Noise Ratio. To address the severe location dependency issue in wireless sensing with accurate theoretical underpinning and experiments, we propose a signal transformation mechanism to automatically convert signals based on the input position, achieving stable sensing performance. Comprehensive experiments demonstrate that WiMorse can achieve higher than 95% recognition accuracy for finger generated Morse code, and is robust against input position, environment changes, and user diversity

exploring an adaptive architecture for service discovery over manets

What a service discovery system (SDS) pursues is to successfully discover the services at low costs if the qualified ones exist. However, dynamics and diversification in MANETs increases the complexity to achieve SDS's goal. This paper develops a SDS over MANETs named SCN4M-H. To enhance system quality, SCN4M-H combines two architecture styles and provides two working modes: basic mode and volunteer mode. In the basic mode, nodes in SCN4M-H work together as peer partners, mapping and discovering the services in a P2P style, and in the volunteer mode, the nodes who declare as volunteers will play the role of servers, they are responsible for dealing with the service discovery requests targeted for the nodes within specified regions. Depending on their own states as well as their neighbors' states, nodes in SCN4M-H can switch automatically from one mode to another. Moreover, two working modes can coexist in SCN4M-H at the same time, which enables a service discovery request to be dealt with in a locally optimal way. Some system properties are revealed and then extensive experiments are conducted. Experimental data indicate that SCN4M-H adapts well to various dynamic scenarios and shows satisfying software quality in terms of discovery success rate and corresponding costs. © 2011 Springer-Verlag

a content-based publish/subscribe system for efficient event notification over vehicular ad hoc networks

Pub/Sub systems over VANETs can be employed to disseminate information in terms of events to vehicle users who desire the information. This paper describes the design, implementation, and evaluation of APUS, a content-based Pub/Sub system for VANETs. APUS can handle the subscriptions with complicated spatial-temporal constraints and forward the notifications to the specified areas so that vehicle users can pick up the notifications there. In regards to the implementation, APUS exploits RSUs (RoadSide Units) to relay messages and match subscriptions with events. Simulation experimental results show that APUS achieves high delivery ratios and stable low costs in event notification no matter how the traffic statistics such as vehicle density and vehicle speed change.Kyushu Sangyo Univ (KSU), IEEE, IEEE Comp Soc, IEEE Tech Comm Scalable Comp (TCSC), Informat Proc Soc Japan (IPSJ), Inst Elect, Informat & Commun Engineers (IEICE), FCVB, IPSJ Special Interest Grp Distributed Proc Syst (IPSJ SIG-DPS), IEICE Special Interest Grp Dependable Comp (IEICE SIG-DC), IPSJ Special Interest Grp Comp Secur (IPSJ SIG-CSEC), IPSJ Special Interest Grp Mobile Comp & Ubiquitous Commun (IPSJ SIG-MBL)Pub/Sub systems over VANETs can be employed to disseminate information in terms of events to vehicle users who desire the information. This paper describes the design, implementation, and evaluation of APUS, a content-based Pub/Sub system for VANETs. APUS can handle the subscriptions with complicated spatial-temporal constraints and forward the notifications to the specified areas so that vehicle users can pick up the notifications there. In regards to the implementation, APUS exploits RSUs (RoadSide Units) to relay messages and match subscriptions with events. Simulation experimental results show that APUS achieves high delivery ratios and stable low costs in event notification no matter how the traffic statistics such as vehicle density and vehicle speed change