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This paper describes a multi-purpose display and a timer developed for athletics. Traditional displays can be used for only one item of athletics, but this display can be used at long jump, throwing events, and combined events. In addition, these devices have the features of wireless communication, low cost, and easiness for users to handle. These have been already on sale and used at athletic games,...
There is a demand for a way for blind persons to receive information at any time and in any place. This is impossible to realize with existing user interfaces using voice output, so this paper introduces the world's first a wristwatch-style refreshable braille display. This braille display has 8 braille cells and 16 input switches. It is controlled from a host computer via the Bluetooth communication...
In the emerging Internet of Things (IoT), consumer electronics are important components to create a smart environment. Embedded systems, which have internet connectivity in their limited resource, are often equipped with separate MCUs for device control and wireless communication. However, this approach is not cost-effective because of multiple MCUs. To solve this, we propose an IoT framework which...
This paper analyzes the application of multihop relaying to improve the physical layer security of a wireless body area network (WBAN). Based on the channel characteristics of WBAN, the secrecy outage performance for single-hop and multihop transmission is studied. Results illustrate that multihop relaying performs much better than the single-hop due to the severe path loss caused by the human body.
A mobile robotic access point (AP) is proposed to provide better wireless network environment. This AP automatically searches and moves to the best position to provide enough radio power for all devices connected to the AP. We designed the mobile robotic AP and evaluate its performance in experiment. It was found that the proposed AP can increase radio power for all devices connected to the AP by...
A new disk repeater can deliver power highly efficiently, being integrated into the resonator coupling type WPT system. Thus, we will demonstrate 2 useful examples in order to show the benefits of the disk repeater.
To show a computer screen on a large display, so far, wired cable connections like VGA, HDMI, and DisplayPort are mainly used. Recently, wireless display technology is becoming popular, especially on mobile devices like PCs, tablets, and smartphones. “Tap to Display” is a connection method triggered by an NFC tap operation. It enables users to show the desktop screen of his PC on the destination Miracast...
This paper demonstrates service control for IoT gadget platform by using web intent. The difference from legacy device-connected service is that it follows the Web's virtue loose coupling of service components. For loose coupling of these components based on the web technologies, it requires light-weight service logic for limited devices like sensor. To support loose coupling service components, proposed...
We have constructed an underwater wireless power transfer system for the swimming robot fish using a coupled resonator WPT technique. The WPT systems are usually affected by dielectric material, the resonant frequency being shifted, and the power transfer loss being increased. By use of the primarily magnetic coupling, we have tried to realize a system that is hardly affected by the water. In addition,...
A sports motion support system for golf swing has been described by using a perceptive sportswear and a wireless mobile device with Android application, in which a trainee is given real-time auditory feedback to be informed the performance of the swing. The wireless mobile device receives motion data from the perceptive sportswear designed in form of shirts and shoes in which hetero-core optical fibers...
In recent years, home ICT services have been actively proposed. To realize the services, power consumption of sensor station increases when a sensor station often wakes up to report sensor data. In this paper, we proposed an application-aware power-saving control method for sensor stations and confirmed an effect of a proposed method which is constructed as OSGi bundle in HGW. By using the proposed...
Wireless mesh network (WMN) is a promising technology for building cost-effective and easy-deployable wireless home networking infrastructure. To efficiently utilize limited radio resources in WMNs, packet transmissions (especially, redundant packet transmissions) should be carefully managed. To this end, we introduce a software-defined WMN architecture where the data plane and control plane are separated...
Various agricultural environment control systems using sensor data have recently been proposed and implemented. However, the high temperatures and humidity in agricultural environments prevent wireless sensor networks from collecting environmental data and operating long term with high reliability. Therefore, in this paper, we propose a greenhouse environment control system that can maintain a high...
In home networks, a variety of smart devices are connected to a WiFi access point (AP) and the oversized buffer of the AP causes high latency/delay jitter and reduced network throughput (known as the bufferbloat problem). To mitigate this problem, appropriate active queue management (AQM) algorithms should be implemented at the AP. In this paper, we conduct extensive simulation study on the performance...
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