Jongwoo Sung

The EPC Sensor Network for RFID and WSN Integration Infrastructure

Despite the popularity of current radio frequency identification (RFID) and wireless sensor networks (WSN), current research fails to propose the global vision that is needed for truly pervasive computing. In this paper we introduce our effort to build a global standard infrastructure for WSN and RFID based on the EPCglobal standard architecture framework. By leveraging the EPC network infrastructure, our proposed EPC sensor network will effectively provide standardized WSN/RFID integration framework to support sensor data sharing.

A 2 S: Automated Agriculture System based on WSN

This paper describes the results of real deployment of A S which consists of WSN(Wireless Sensor Network) to monitor and control the environments and a management sub-system to manage the WSN and provide various and convenient services to consumers with hand-held devices such as a PDA living a farming village. The WSN were deployed in greenhouses with melon and cabbage in Dongbu Handong Seed Research Center. A S was used to monitor the growing process of them and control the environment of the greenhouses. We acquired valuable experiences and ideas from this real deployment and operation of A S and believe that they can be useful in consumer electronics field such as home network as well as automated agriculture field. .

Complex Event Processing in EPC Sensor Network Middleware for Both RFID and WSN

In an integration system of RFID and wireless sensor network (WSN), RFID is used to identify objects while WSN can provide context environment information of these objects. Thus, it increases system intelligent in pervasive computing. We propose the EPC sensor network (ESN) architecture as an integration system of RFID and WSN. This ESN architecture is based on EPCglobal architecture, the de facto international standard for RFID. The core of ESN is the middleware part which is also implemented in our work. In this paper, complex event processing (CEP) technology is used in our ESN middleware which can handle large volume of events from distributed RFID and sensor readers in real time. Through filtering, grouping, aggregating and constructing complex event, ESN middleware provides a more meaningful report for the clients and increases system automation.

Wireless Sensor Networks for Cultural Property Protection

Wireless sensor network technology has been proven to have a strong impact on our daily life from many real applications. In this paper wireless sensor networks for cultural property protection are introduced. We deployed wireless sensor networks in Bul-guk-sa Temple, which is one of the most important UNESCO cultural property sites in Korea. This paper presents our wireless sensor network system for monitoring and protecting cultural property from the aspect of application design to network system management.

UPnP based intelligent multimedia service architecture for digital home network

Demand of multimedia contents in home network is growing rapidly and UPnP is expected to bring better multimedia experience with various A/V devices. However, UPnP A/V architecture, which allows the multimedia contents to be shared between A/V devices, is limited to the environments where interoperable contents format and identical network protocols are used. In this paper, we propose an intelligent multimedia service framework which enables A/V contents to be adopted and shared according to user multimedia environments. We design and implement our multimedia service architecture based on UPnP A/V service and MPEG-21 multimedia framework

ANTS: an evolvable network of tiny sensors

As a promising technology that enables ubiquitous computing and leads IT industries of next generation, sensor networks (SN) are foreseen to expand and populate the globe in such a way as the present Internet does. In this scenario, new challenges appear with such massive deployment, as the constant interaction of nodes and networks will transform them in dynamic entities that will need to evolve with their environment. In this paper, we discuss the future of sensor networks defining the concept of evolvability and its application. We also describe ANTS, a complete new architecture for wireless sensor networks, as our implementation to solve the challenges imposed by this evolvable future.

Internet metadata framework for plug and play wireless sensor networks

Metadata, self-describing data about sensor nodes and sensing data, is needed to understand different capabilities provided by heterogeneous sensor networks. However, storing metadata in resource constrained sensor nodes is infeasible in terms of increased memory costs and multi-hop communication overheads. More than this, sensor networks have difficulties with supporting XMLs and high level models often used for describing metadata. To overcome the problem we propose metadata frameworks that store metadata in distributed servers on the Internet instead of sensor nodes. The metadata overheads in sensor nodes are minimized because sensor nodes store only a few bytes long identifier as a key to look up a metadata on distributed servers. New sensor node discovery that finds specific sensor nodes using desiring attributes against retrieved metadata is also presented. In this paper we present a new approach for enabling plug and play wireless sensor networks.

Distributed Low Power Scheduling in Wireless Sensor Networks

Wireless sensor networks are becoming more and more common in the ubiquitous computing era. The applications of sensor networks are diverse and they are employed in areas such as smart homes, military, ITS, fire monitoring, factory automation, and so on. However, sensor networks are generally battery powered and thus, low power consumption is required for prolonged use. In this paper, we propose a distributed low power scheduling algorithm for sensor nodes to determine its active time slots in a TDMA mechanism working on top of a slotted CSMA network. The performance evaluation shows that an extremely small duty cycle is achieved by the proposed algorithm with a tradeoff in data delay in a sensor network application

Service Oriented Wireless Sensor Network Toolbox for Consumer Applications

Service-oriented computing which provides flexible composition of various applications using multiple reusable services has getting more attractive. We propose a service oriented wireless sensor networks toolbox, which encapsulates complexities of sensor networks and enables simple service compositions using an intuitive GUI. We utilize sensor networks as a collection of services that are discovered and coordinated by users. Service metadata which are self-describing service capabilities and interfaces are defined and exposed via our service metadata repositories. A service oriented sensor network toolbox consisting of sensor networks, an intuitive GUI application that retrieves metadata for discovered services and helps users to composite various roles are presented.

Template based High Performance ALE-TSOAP Message Communication

Recently, the RFID technology has become essential for ubiquitous computing. As the deployment of mega SCM (supply chain management) environments starts at the largest companies in the distribution industry, efforts tend to concentrate on a variety of performance improvements for the RFID middleware aiming to give quality of service for large RFID-data transmission. Web services, cornerstone of the RFID networks, require high performance, security and extensibility. Since SOAP (simple object access protocol) inherits the poor performance of XML, it is not easy for the RFID middleware to support high performance web services. The ALE (application level event) communication interface from the RFID middleware sends a response message. Its serialization, which includes the conversion of common language runtime objects to the XML documents and streams and packing of this data into a message buffer, has been proven as the bottleneck for SOAPs poor performance. In this paper, we propose ALE-TSOAP, based on ALE templates, that provides an increase in the performance of the RFID middleware when generating response messages. We analyze SOAP messages to classify the various ALE template formats, to design and implement our ALE templates and, finally, to evaluate the performance of the ALE-TSOAP processing. The use of ALE-TSOAP does not change the SOAP protocol or the ALE communication interface of the RFID middleware. Through our experiments, we observed that our approach obtains up to a 197.8% performance gain by only using ALE templates for the serialization of SOAP message.