• Journal of KIISE:Computer Systems and Theory
• /
• v.33 no.11
• /
• pp.820-829
• /
• 2006

Wireless sensor networks consisting of hundreds to thousands of nodes are expected to be increasingly deployed in coming years, as they enable reliable monitoring and analysis of physical worlds. These networks have unique features that are very different from traditional networks, e.g., the numerous numbers of nodes, limitation in power, processing, and memory. Due to these unique features of wireless sensor networks, sensor data management including querying becomes a challenging problem. Furthermore, due to wide popularization of the Internet and its facility in use, it is generally accepted that an unattended network can be efficiently managed and monitored over the Internet. In particular, in order to more efficiently query and manage data in a sensor network. in this paper, the architecture of a sensor gateway including web-based query server is presented and its implementation detail is illustrated. The presented web-based gateway is largely divided into two important parts: Internet part and sensor network part. The sensor network part plays an important role of handling a variety of sensor networks, including flat or hierarchical network architecture, by using internally layered architecture for efficiently querying and managing data in a sensor network. In addition, the Internet part provides a modular gateway function for favorable exchange between the sensor network and Internet.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.10 no.2
• /
• pp.203-210
• /
• 2015

The ecological environment monitoring system configured with Sensor Node, Gateway, Service Platform, and Web Browser. In this paper, we designed gateway resource tree and service function to do handling in the ecological environment monitoring service. Gateway Service Function based on oneM2M Common Service Function, Gateway Resource Tree configured with Application Part handling Sensor Data and Gateway link handling. lastly Device Registration, Sensing, Control, Profile Management.

• The Journal of the Korea Contents Association
• /
• v.10 no.8
• /
• pp.73-83
• /
• 2010

This paper investigates protocol architecture of a Web-ZigBee gateway for interconnecting TCP/IP-based networks and ZigBee/IEEE802.15.4-based wireless sensor networks. The Web-ZigBee gateway delivers data between the TCP/IP network and the ZigBee network. Since those two networks have different communication protocols, a protocol translation mechanism is needed. Herein, we propose a method to deliver query messages from the Internet to the sensor network and receive data from sensors. The protocol translation is performed in the translation layer that is placed above the two application layers, i.e., the Internet application layer and ZigBee application layer. Among various interfaces, we use CGI programming to take care of translation functions efficiently. The CGI manages query information from a client on the Internet and data from the ZigBee sensor network. Whereas the TCP/IP enabled sensor network overlays two heterogeneous communication protocols, overlaying layers increase the complexity and cost of implementing the sensor network. On the contrary, the sensors in our gateway-based system are not only light (because each communication protocol works independently without overlaying), but also efficient because the translation layer mostly alleviates header overloading.

• Proceedings of the Korean Information Science Society Conference
• /
• 2010.06c
• /
• pp.11-15
• /
• 2010

최근 들어 정보기술의 발전으로 인해 타 연구 분야와 정보기술을 접목하여 새로운 연구를 수행하려는 IT 융합 연구의 비중이 커지고 있다. 지구환경 보호를 위해서 국내외 환경 및 생태학 분야에서도 정보기술을 기반으로 한 연구가 많이 수행되고 있다. 하나의 예로 미국 위스콘신대학교를 중심으로 정보기술자와 생태학자가 협력하여 미국, 뉴질랜드, 대만 등의 호수와 하천의 생태학적 관측 자료를 수집하여 웹기반으로 연구자에게 제공하는 GLEON(Global Lake Ecological Observatory Network) 연구 사업이 진행되고 있다. 국내에서도 강원대학교에서 소양호와 의암호 등지에 센서를 설치하여 고해상도 모니터링을 시도한 사례가 있었다. 이에, 본 논문에서는 하천 및 호수에 설치된 센서에서 수집되는 다량의 데이터를 처리하여 환경 및 생태학자들이 활용 가능하도록 한국과학기술정보연구원(KISTI)이 보유한 사이버인프라스트럭처를 기반으로 환경.생태분야 e-Science 게이트웨이를 설계하고자 한다. 이를 위해 1) GLEON 등의 해외 관련 사이트를 조사하였으며, 2) 강원대학교에서 설치하여 운영 중인 소양호, 의암호 등에서 센서 관측 데이터를 수집하고, 3) 수집된 데이터를 처리하기 위한 메타데이터와 데이터베이스 스키마를 설계하고, 4) 환경.생태학자들이 연구에 활용 가능하도록 웹 기반 e-Science 게이트웨이인 KLEON(Korean Lake Ecological Observatory Network)을 설계하였다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2002.10e
• /
• pp.295-297
• /
• 2002

최근 들어, 냉장고, 세탁기, TV 등과 같은 가정내의 가전들을 효과적으로 제어하고, 웹에서의 접근을 위한 홈 네트워크 기술에 많은 관심이 모아지고 있다. 홈 네트워크는 가전, 센서, 스위치, 제어기등과 링크할 수 있으며 멀티미디어 데이터의 전달을 위한 인프라의 제공 및 애플리케이션에 대한 사용자 인터페이스를 제공한다. 이러한 다양한 멀티미디어 데이터를 효과적으로 처리하기 위해서는 홈 게이트웨이가 필요하며, 이러한 홈 게이트웨이에 대한 연구가 활발하게 진행되고 있다. 그러나 다양한 데이터 구조의 처리를 위해 IEEE1394, Bluetooth, LonWorks, WLAN, HomePNA, PLC 둥과 같은 다양한 기술의 사용으로 인해 현재 홈게이트웨이는 매우 복잡한 구조를 가지게 되며, 기기간 상호 운용성도 보장하기 어려운 실정이다. 이에 본 논문에서는 홈 네트웍에서 존재하는 다양한 미디어 데이터를 효과적으로 처리할 수 있는 새로운 홈게이트웨이의 구조를 설계하고, 각각의 미디어 데이터를 인터워킹 가능한 패킷으로 만들어 주는 Media Processor와 서로 다른 미디어간의 인터워킹을 위한 Common Switch Interface의 구조에 대하여 기술한다.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.46 no.10
• /
• pp.43-51
• /
• 2009

In this paper, we present an integrated management system for WSNs (Wireless Sensor Networks). Each sink node of heterogeneous sensor networks is connected with a gateway. By supporting various hardware platforms and networking models, the gateway is able to collect management information from one or more WSNs and store it in a MIB (Management Information Base). The management system obtains management information from the MIB of the gateway by SNMP (Simple Network Management Protocol) and analyzes it. A manager can have access to the management system through the Web wherever the Internet is available and manage WSNs as well as sensor nodes. We implemented the proposed management system and our findings revealed the practicality of this system.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2013.10a
• /
• pp.737-740
• /
• 2013

The widespread use of smart home appliances with smart home networking is leading to a next generation of a new technology that exploit user contextual information to provide a richer experience. However, in the most part of home networking systems the intelligent personalization services between user and home appliances have not been adequately supplied in respect of the long lifespan of the legacy home appliances. In addition, without installing smart home appliances when constructing new building the users can not use this service. To use this service, the legacy home appliance need to attach enabler equipped with the various sensors just as it is smart home appliances. The goal is to create a service that enables appliances to exchange information and control their actions through the IoT gateway to achieve nonintrusive behavior and customized services without human intervention. In this paper, we propose a ontology model to represent the user context to be able to induce right service automatically and use it to discover, utilize and enhance different services in real time that the user may be interested in.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.12 no.1
• /
• pp.445-450
• /
• 2011

In this paper, we describe the implementation of an wireless sensor network testbed. We developed a web-based sensor network gateway and enhanced the Surge program which is used for sending and routing of packets in the sensor field. The developed program can transmit the source data of sensor nodes to the sink node via multi-hop routing, and deliver user commands to actuate sensor related equipments. Moreover, in this testbed, the data transport path from a node to the sink can be monitored. Thus we can approximate the network topology and the relative positions of sensor nodes. We also describe an application of the testbed that is used for controlling a remote robot.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• v.9 no.1
• /
• pp.884-887
• /
• 2005

정보화 사회로 진행되어 감에 따라 임베디드 시스템에 관한 연구는 날로 발전해 가고 있다. 개인과 개인간의 정보공유 모델인 P2P의 중앙서버가 필요 없이 다른 사용자들과 정보를 주고받을 수 있는 장점을 활용 하여 기존 임베디드 시스템의 각각의 센서들은 게이트웨이에 연결하여 서버와 클라이언트 구성이 었다면 각 센서 끼리 통신이 가능하도록 설계하여 클라이언트 끼리 네트웍을 구성하고자 한다. 최적화 저전력 초소형 임베디드 웹서버를 제안하고 각각 센서(균열센서, 열감지 센서등등) 설계 하여 빌딩의 붕괴, 산재 등등의 예상치 못한 사고가 발생시 건물 정보를 수집하는 센서 상호간에 네트웍으로 연결시키며 웹포팅 및 웹에서 하드웨어 제어 및 포팅 및 부트로더에서 하드웨어 테스트 과정을 걸쳐 최종으로 결과를 얻는다.

• 전자공학회논문지 IE
• /
• v.46 no.3
• /
• pp.55-61
• /
• 2009

This paper describes an assistant system for elders who live alone. The developed system is composed of a wearable RFID system, a gateway system, and server system. The wearable RFID system is installed in glove. The wearable RFID system can be considered as a wireless sensor network which has a sink node and sensor node with a RFID reader. The sensor node can read RFID tags on the various objects used in daily living such as furniture, medicines, sugar and salt bottles, and ok. The sensor node transmits wireless packets to the sink node. The sink node sends the received packet immediately to a server system via a gateway system. The gateway provides users with audio-visual information of objects. The server system is composed of a database server and a web server. The data from each wearable RFID system is collected into a database, and then the data are processed to visualize the measurement of daily living activities of users. The processed data can be provided for someone who wants to know about user's daily living patterns in house such as family, caregivers, and medical crew.