Jong-uk Lee

RFMS: Real-time Flood Monitoring System with wireless sensor networks

In this paper, we present RFMS, the real-time flood monitoring system with wireless sensor networks, which is deployed in two volcanic islands Ulleung-do and Dok-do located in the East Sea near to the Korean peninsula and developed for flood monitoring. RFMS measures river and weather conditions through wireless sensor nodes equipped with different sensors. Measured information is employed for early-warning via diverse types of services such as SMS (short message service) and a Web service.

Haptic interaction with user manipulation for smartphone

This paper presents haptic interaction design and implementation for our designed smartphone bumper case [1] providing an interactive and a realistic physical feeling. The thin actuator is installed in the case to simulate a rapid realistic response. We designed a software structure guaranteeing a realtime physical response. The designed API can be used to provide realistic touch responses corresponding to an interactive physical feeling during gaming applications corresponding to sound effects.

SHIFT: interactive smartphone bumper case

This paper introduces a novel smartphone bumper case providing an interactive touch sense and a realistic physical feeling. The thin and rapidly responding film-like actuator installed in the case simulates a physical response. A battery and a wireless communication controller are also embedded for the implementation of a stand-alone device. As the case is designed to be assembled with a smartphone and the assembly does not require any hardware revision of the smartphone, the proposed device has high compatibility with current consumer products. We designed a software structure guaranteeing a real-time physical response. The API can be used to provide realistic touch response and a user test is conducted for a comparison with the conventionally used vibrator in a mobile device.

Voice over ZigBee networks with environmental monitoring

ZigBee technology is being embedded in a range of applications up to smart energy, healthcare, and telecommunication services. In this paper, we present a voice transmission system, one of telecommunication value-added services, based on the low-rate ZigBee networks. We design a model to perform a sensor role as a member of ZigBee networks in addition to providing the cost-effective voice transmission function.

A haptic touchscreen interface for mobile devices

In this paper, we present a haptic touchscreen interface for mobile devices. A surface actuator composed of two parallel plates is mounted between a touch panel and a display module. It generates haptic feedback when a user input on a touch screen. The electrostatic force is generated when two parallel plates are charged and this phenomenon causes haptic feedback. When an input is detected on the touch screen, multimodal feedback that includes not only basic visual and auditory feedback but also haptic feedback occurs appropriately. Then, a user feels realistic physical feeling in the fingertips and it provides the feeing such as pressing a real keyboard. We have designed and implemented an actuator, thin and transparent, to provide haptic feedback and an interactive architecture to perform multimodal output.

An Integration Avenue of Ground Monitoring Based on Wireless Sensor Networks

Since wireless sensor networks (WSNs) have a lot of potential capability to provide diverse services to human by monitoring things scattered in real world, they are envisioned as one of the core enabling technologies for ubiquitous computing which organizes and mediates both physical and social interactions anytime and anywhere. WSNs are being adopted in various fields and things in their zones are being monitored. However, existing WSNs are normally designed for observing special zones or regional things based on small-scale, low power, and short range technologies. Seamless system integration at a global scale is still in its infancy stage due to the lack of the fundamental integration technologies. In this paper, we present a global integration avenue of ground monitoring based on WSNs. The proposed avenue includes design, integration, and operational strategies of IP-WSN based territorial monitoring system to ensure compatibility, interoperability, and real-time. Specifically, we offer the standardization of sensing data formats using IP-WSN and database interfaces using EPC sensor network, which enable a spontaneous and systematic integration among the legacy WSN systems. Also, we categorize network topology according to topographic characteristics thereby helping deploy sensor nodes on the real environment. Therefore, the proposed technology would be a milestone for the practically deployable global territorial monitoring systems.

A Study on WSN System Integration for Real-Time Global Monitoring

Since Wireless Sensor Networks (WSNs) have a lot of potential capability to provide diverse services to human by monitoring things scattered in real world, they are envisioned one of the core enabling technologies for ubiquitous computing. However, existing sensor network systems are designed for observing special zones or regional things by using small-scale, low power, and short range technologies. The seamless system integration in global scale is still in its infancy stage due to the lack of the fundamental integration technologies. In this paper, we present an effective integration avenue of real-time global monitoring system. The proposed technology includes design, integration, and operational strategies of IP-WSN based territorial monitoring system to ensure compatibility and interoperability. We especially offer the standardizations of sensing data formats and their database interfaces, which enable a spontaneous and systematic integration among the legacy WSN systems. The proposed technology would be a fundamental element for the practically deployable global territorial monitoring systems.