Yunjung Park

Remote control system for User Created Robot supporting interoperability between controller and robot

User Created Robots (UCRs) are personal robots that consist of toy blocks. Usually user controls UCR via short-range wireless communications such as IR, ZigBee, Bluetooth and so on. However, this current technology has some spatial limitations. UCR remote control system gives extension of UCR related services and activities. Also this system allows in conjunction with e-education services and other external services such as web services and virtual worlds. In this paper, we handle two key issues for expansion of UCR applications. One is how to control UCR in a place far away, and the other is how to support interoperability between UCR and its controller. We solve these issues by network protocol transformation and logical key mapping structure. We suggest system architecture of UCR remote control system that supports interoperability and our implementation and evaluation results show efficiency of proposed system.

Development of HLA-DDS wrapper API for network-controllable distributed simulation

These days, distributed simulation system domain is growing increasingly in terms of data size and number of data transmission. Therefore, network control mechanism for data transmission in distributed system is required. For this, we replace transport layer of HLA-based distributed simulation system using Data Distribution Service (DDS) communication. In this paper, we pursue the network-controllable distributed simulation using DDS. We suggest HLA-DDS wrapper API which combines HLA APIs and DDS APIs and wraps them to be seen as one middleware API to users. HLA-DDS wrapper API consists of simulation service APIs from HLA and QoS-based network configuration APIs from DDS and some HLA-DDS data transformation APIs for interconnecting HLA data object and DDS data object. HLA-DDS wrapper is not only allow network-controllable distributed simulation systems but also preserve existing HLA-based distributed simulation system; because HLA-DDS wrapper API comply with HLA standard APIs.

Secure-EEDR: Dynamic Key Exchange Protocol Based on Diffie-Hellman Algorithm with NOVSF Code-Hopping Technique for Wireless Sensor Networks

Secure data transmission and data routing are critical in designing cluster based sensor network. This paper presents a secure energy efficient dynamic routing scheme (SEEDR) for wireless sensor networks. SEEDR uses a symmetric cryptography algorithm to support security. The dynamic key exchange protocol based on DH (Diffie-Hellman) algorithm is proposed, with non blocking OVSF codes. Our analytical model and the security analysis prove that SEEDR increase data communication security and consume less communication energy.

Middleware Integration of DDS and ESB for Interconnection between Real-Time Embedded and Enterprise Systems

As technology evolves, the border of embedded system and enterprise system is gradually meaningless. ESB is a well-known middleware for integration of enterprise services and systems, and DDS is a promising real-time communication middleware for embedded systems. This paper introduces structurally integrated architecture between DDS middleware and ESB middleware for interconnection between real-time embedded systems and enterprise information systems. An integrated architecture of DDS and ESB allows integration of embedded system environment and enterprise system environment. It supports integration of diverse embedded devices from ubiquitous systems with real-time communication and allows effective data processing using enterprise services, which are generated from embedded systems. We design DDS binding component for ESB to allow DDS communication to enterprise services. This DDS-ESB integration architecture could be applied in the field that generates huge of data for monitoring and processes data for providing user services in real-time, such as u-City or home network.

A High Connectivity Pre-Distribution Key Management Scheme in Grid-Based Wireless Sensor Networks

Key management is a decisive part for security in wireless sensor networks. Pre-distribution of secret keys for all pairs of nodes is not viable due to the large amount of memory used when the number of sensor node is huge. Recently, a random key pre-distribution scheme is proposed as an efficient solution for sharing keys among sensor nodes to reduce the length of shared key and avoid unnecessary key assignments. By studying the range of the communication signal in sensor nodes, we can improve the pre-distribution key mechanism, thus get a higher connectivity possibility between sensor nodes in the whole network. In this paper, we present a grid-based scheme with novel approach for key-distribution mechanism based on the communication range of sensor nodes that guarantees a high probability of sharing keys between sensor nodes. Our evaluation and simulation show that our approach outperforms the existing schemes in both high connectivity probability and low memory usage.

Home multimedia integration system using UPnP and Service Convergence Gateway engine

Recently, due to the rapid development of IT technology and the penetration of internet through super high-speed internet network, lots of network-enabled multimedia devices are spread in the home network. However, there are integration and management problems because of their incompatibility. In this paper, we propose home multimedia integration system that integrates multimedia devices and services in the home network using UPnP and Service Convergence Gateway (SCG) engine. The SCG engine is a gateway engine for service convergence among devices. This home multimedia integration system pursued the integration of services of home multimedia devices and its contents, and tried to enable their management and control easily. Using this system, we can use any media contents that contained in any multimedia devices, regardless of where media contents are physically stored. Also, this system provides two methods to expand the system to the outside of home network. One is allowance of connections from the outside of home network, and the other is to make a external multimedia contents service information storage to integrate multimedia contents services which are provided by outside of home network. In addition, we evaluate this system by implementing core parts of the system.

Smart TV usage extension method using screen division and virtual network computing

Smart TV market grows rapidly, and it becomes another important part of our life cycle. Main factor of growing smart technologies are their useful applications. There are necessities for users to run their casual PC applications in Smart TVs. Therefore, some applications have been developed or ported to be able to run in Smart TVs. However, the process of converting many PC applications requires a lot of works that it is hard to convert every PC applications to Smart TV. In this paper, we propose Remote Desktop Client Platform (RDCP) solution to allow PC applications, easily being adapted to Smart TV application environment. We have used Virtual Network Computing (VNC) as a core of RDCP. Additionally we have divided big screen into two sub-screens, to get extra functionalities and comfortable usage. This method retains original functionalities of Smart TV. Implementation of this solution has been done using Smart TV SDK that contains cutting edge web technologies with the last updates of HTML5. By using proposed RDCP solution, the VNC ported Smart TV could extend its usage into education and entertainment field. In addition, we have implemented assistive tools to control Smart TV remotely.

Performance Evaluation for Efficient Complex Event Processing System According to Event Types and Environment

Complex event processing (CEP) is a relatively new technology for processing and analyzing multiple events from distributed sources, with the objective of extracting useful information from them. We need architecture of efficient complex event transporting and processing system according to event types and environment because of these events generate in various environment. It is not only generated in simple system but also generated complex system such as U-City, integrated meteorological information system (IMIS) that needs integration with other system using enterprise service bus (ESB) for extending system and enterprise event processing. In this paper, we propose the guideline of applying method for architecture of system that processes complex event using CEP engine and optimized transfer protocol according to characteristic of generated events and environment through performance test.

Adaption and Assessment of ETSI M2M Standard in Smart Home Environments

Recently, smart home environments which provide complex services through smart appliances are becoming realized, due to the advances in connected devices and network technologies. Current smart home environments are mostly restricted, because of difficultly of integration of heterogeneous smart appliances. Therefore radical service integration is impracticable. In this paper, we analyze and implement Machine-to-Machine (M2M) standards which are established by European Telecommunications Standards Institute (ETSI) for integrating heterogeneous devices and services. Smart Home is one of the areas covered by ETSI M2M standards, however these standards are just standardized, so adaption and assessment in smart home are not proved yet. Therefore, this paper analyze ETSI M2M standards by focusing the data transport model and evaluate by selecting the most commonly used smart home scenarios and by implementing ETSI M2M standards compatible smart metering system. In some points ETSI M2M standards are not efficient because of its complexity of structure, however ETSI M2M provides sophisticated features for integrating M2M which are appropriate to adopt diverse smart home environments.

Distributed traffic simulation using DDS-communication based HLA for V2X

For implementing Cooperative Intelligent Transport Systems (C-ITS), Vehicle-to-X (V2X) communication functions are important. For efficient V2X simulation, integrating heterogeneous simulators and sophisticated inter-simulator network control are required. In this paper, we suggest Data Distribution Service (DDS) communication-based High Level Architecture (HLA) for distributed V2X simulation by replacing HLA network transport into DDS-based communication. For replacing, we design HLA-DDS wrapper for supporting HLA-DDS transformation. This paper also contains implementation and evaluation of the DDS communication-based V2X simulation system to prove our concept. This kind of advanced simulation communication method would enhanced the overall operation of long-term, large-scale V2X simulation.