Gwanyeon Kim

Design and implementation of power-aware LED light enabler with location-aware adaptive middleware and context-aware user pattern

Recent advances in ubiquitous technologies facilitate location-aware and power-aware systems that can provide predefined services. Recent research efforts are based on control mechanisms for standby power reduction. Conventional systems are only designed for power reduction of the consumer electronics. However, due to their architectural limitations, the recent systems are not flexible with respect to LED light control for power reduction. We need to consider efficient autonomous power control based on intelligent devices and the power-aware service prediction in networked environments. In this paper, we propose a power-aware LED light enabler with light sensors, motion sensors and network interfaces. The LED light enabler also communicates with context-aware middleware using an intelligent power gateway that adaptively determines the optimal power control by analyzing user living patterns using sensing data obtained by devices. Our power-aware LED light enabler with adaptive middleware dynamically reconfigures the power-aware services. The proposed adaptive middleware facilitates the learning mechanism which analyzes the illumination and the user activity, and controls the LED lights only when users exist around the devices. Our enabler reduces power consumption up to 58% in comparison to a basic lighting system at the real office testbed.

Intelligent power management device with middleware based living pattern learning for power reduction

This paper presents design and implementation of intelligent power management devices using user location, user motion detection and user living patterns in home networks. Our design integrates the device to be controlled, the intelligent power management device (iPMD), and the adaptive light-weight middleware so that it can be used with minimal power consumption for a wide range of applications. iPMD which will be installed in every power outlet in a home, is made up of five blocks: the pyroelectric infrared (PIR) sensor circuit, the light sensor circuit, the microprocessor, the power meter with a LED display and the PLC module. iPMD detects if a human body enters the detection area or not. If there is no human body present, all controlled appliances are turned off and iPMDs help reduce standby power consumption. If there is, the iPMD detects the light intensity under the environment and maintains sufficient light by controlling the nearby lights. An iPMD transmits and receives the sensor data from nearby iPMDs so the IPG can control different lights and appliances in different regions. iPMDs also communicate with the lightweight middleware at an intelligent power gateway (IPG) that adaptively reason the optimal power control by analyzing user living pattern from the sensing data from devices. The experimental results obtained from the real apartments show that the total power consumption can be reduced up to 7.5 %.

Seamless and secure mobility management with location-aware service (LAS) broker for future mobile interworking networks

The proliferation of wireless local area networks (WLANs) offering high data rate in hot spot area have spurred the demand for possible WLANs and third-generation (3G) cellular network integration solutions as the initiative step towards 4G systems. This paper provides a novel architecture for seamless location-aware integration of WLANs into 3G cellular networks and also an analysis for the efficient handover techniques. We introduce location as a key context in secure roaming mechanism for context-aware interworking in 4G systems. The fast secure roaming with location-aware authentication is implemented at an entity called location-aware service (LAS) broker that utilizes the concepts of direction of user and pre-warming zone. The location-aware interworking architecture supports seamless roaming services among heterogeneous wireless networks including WLANs, wireless metropolitan area networks (WMANs), and 3G cellular networks. This paper also includes a description of procedures needed to implement efficient mobility and location management. We show how the LAS broker with pre-warming and context transfer can obtain significant lower latency in the vertical handover.

A Context-Aware Dynamic Service-Oriented System for Reconstructing Adaptive Services by the Management of Rule and Ontology

The context-aware system needs to reason and manage the dynamically changeable contexts for offering the user-centric services using the multi-agent systems. Therefore, our system is focused on the rule and ontology modification for dynamically offering the adaptive services according to the changes of environments and situations using the F-logic. This paper also proposes a context-aware dynamic service-oriented system (CADSOS) architecture which consists of the multi-agent system and context broker using the OSGi framework and SDOR engine based OntoStudio. We consider the delay time of the service reconstruction and rule modification in the reasoning engine using the policy of the service management. The evaluation of the system shows evidence that our system enhances the service response time for reasoning and managing the adaptive services. We can apply the various systems of ubiquitous computing environments by effectively offering the dynamically services.

Efficient 3G/WLAN interworking techniques for seamless roaming services with location-aware authentication

This paper proposes novel concepts and architectures for location-aware seamless authentication and roaming in the new interworking system between third-generation (3G) mobile networks and wireless local area networks (WLANs) where local mobility movements (micro-mobility) are handled together with global movements (macro-mobility). We introduce location as a key context in secure roaming mechanism for context-aware interworking. The fast secure roaming with location-aware authentication is implemented at an entity called LBS Broker that utilizes the concepts of direction of user and pre-warming zone. We present the interworking techniques with LBS Broker for seamless secure WLAN/3G integration enabling to meet the requirements of the future location-aware service scenarios. Performance evaluation is also presented to demonstrate the effectiveness of the proposed scheme for fast location-aware secure roaming.

Development of LED smart switch with light-weight middleware for location-aware services in smart home

In recent years, the home network has focused on service diversity and the intelligent enhancement of devices for providing user-centric services. Recent studies dealing with home network systems aggregate the sensor data and manage various devices for reasoning the adaptive services. However, home network systems, especially intelligent devices, are difficult to implement due to the high setup cost and the problems with interconnection among other devices in a home domain. Therefore, we consider the intelligent implementation of light switch present in whole spaces. We propose a LED Smart switch with light-weight middleware which provides location-aware service and pattern-based service prediction. The proposed switch with an embedded sensor manages active and passive events according to the sensor data analysis and the service reasoning. Furthermore, the LED smart switch locates the user and interconnects among other switches over a network connection. The smart switch using a LED display provides simple information service, such as weather forecast, stock information, and the light status, using icons and digitalized voices. To evaluate the efficiency of our switch, we implemented testbed, in a home and an office. Our switch reduces the service response time by up to 12% for our experiment.

Development of portable intelligent gateway system for ubiquitous entertainment and location-aware push services

Intelligent gateway systems have evolved to seamlessly offer location-aware and multimedia services, allowing multi users to roam among multi service domains. In the past decade intelligent gateways have been implemented to support context-aware multimedia services with network convergence and service reasoning mechanisms in multi domains. However, recent researches have to consider multiple events and service management according to the users movements and requirements. Therefore, we propose a Portable Intelligent Gateway System (PIGS) to offer seamless device-independent multimedia services and location-aware push services. Using heterogeneous network convergence and utilizing cooperation between other gateways, the PIGS interconnects users (user devices) who want to be offered multimedia services and Service Providers (SPs). Furthermore, our system dynamically offers differential services to multiple users with respect to the user, device and location characteristics. The PIGS also collects events using embedded sensors and generates events used for service configuration along with service predictions by using light-weight middleware. In this paper we implement real testbed, a house and a car, and verify the effectiveness of the service reconfiguration. The portable gateway structure using the PIGS achieves a 22% faster service response time in comparison to a fixed gateway-based structure.

A Context-Aware Multi-Agent System for Building Intelligent Services by the Classification of Rule and Ontology in a Smart Home

This paper proposes a context model which separates the upper and lower layer according to characteristic of each class using the Web Ontology Language (OWL). We also present a context-aware multi-agent system (CAMAS) architecture which provides the solution of policy problem using the classification of rule and implementation of a rule-based engine. We enhance the response time for offering adaptive services. We solve the policy conflict problem among users by using reasoning and privilege delegation.

Location-Aware multi-agent based intelligent services in home networks

The development of intelligent multi-agent systems involves a number of concerns, including mobility, context-awareness, reasoning and mining. Towards ubiquitous intelligence this area of research addresses the intersection between mobile agents, heterogeneous networks, and ubiquitous intelligence. This paper presents a development of hardware and software systems to address the combination of these interests as Location-Aware Service. Our architecture performs the intelligent services to meet the respective requirements. By adding autonomous mobility to the agents, the system becomes more able to dynamically localize around areas of interest and adapt to changes in the ubiquitous intelligence landscape. We also analyze some lessons learned based on our experience in using location-aware multi-agent techniques and methods.

Design and implementation of efficient cipher engine for IEEE 802.11i compatible with IEEE 802.11n and IEEE 802.11e

For high data rate, new MAC mechanisms such as Block Ack in IEEE 802.11e and frame aggregation in IEEE 802.11n are being currently discussed and these mechanisms need short response time in each MPDU processing. In this paper, we propose a design of cipher engine for IEEE 802.11i to support these new mechanisms. We reduce the processing overhead of RC4 key scheduling by means of using the dual S-Box scheme. In CCMP design, parallel structure is proposed, and as a result, we reduce the processing time to 1/2 in comparison with the sequential structure and the response time independent of the size of the payload and only dependent on the clock frequency. In addition, we can expect to decrease power consumption in CMOS design process because the clock frequency reduces to 1/5 and the area doubles compared to the typical designs.