• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.17 no.2
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• pp.57-62
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• 2017

Recently, the use of electronic control units in vehicle has increased. The ECUs are connected to in vehicle networks to process a large amount of information. In this paper, for an actuator that is interconnected to CAN and FlexRay, a FlexRay-CAN gateway is presented and a data packing algorithm with a bisection method of a FlexRay slot is proposed. And, a network based actuator control system and packing map is implemented. With the proposed packing method, contact force sensor data are transferred within the maximum allowed delay to ensure the stability. The proposed method is useful for control of distributed system.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.3
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• pp.931-942
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• 2010

A home network provides users with a variety of information services. The kind and quality of the services can be substantially enhanced by utilizing a variety of data from sensors. However, home networks currently limit their potential by focusing on providing multimedia services rather than services utilizing sensor data. Outdoor electronics are frequently made in a form that emphasizes only certain limited functions in contrast to home appliances. Thus, sensors with one or two functions rather than many can be used in outdoor systems and their use will be more economical than using sensor nodes indoors with more complex home appliances. In this study, we chose to work with motion sensors as they have many potential uses, and we selected a parking lot control system with to use the motion sensors. This parking lot control system was implemented and applied as part of a home network. For this purpose, we defined and implemented a protocol to manage the network in a ubiquitous sensor network environment for the wireless home network in this study. Although a network management system in a Ubiquitous Sensor Network (USN) related to this study is being advanced for other projects, the protocol interface and message system have not yet been clearly defined for use in a general purpose network or in an extension into heterogeneous kinds of networks, communication support, etc. Therefore, USN network management should be conducted for management of faults, composition, power, and applications. To verify the performance of the protocol interface designed in this study, we designed and implemented the necessary units (sensor nodes, sensor gateway, and server) for each network section and, with them, proved the validity of this study.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.1
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• pp.135-141
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• 2016

Recently, the needs for the development and application of marine robots are increasing as marine accidents occur frequently. However, it is very difficult to acquire the information by utilizing marine robots in the marine environment. Therefore, the needs for the researches of sensor networks which are composed of underwater, surface and aerial robots are increasing in order to acquire the information effectively as the information from heterogeneous robots has less limitation in terms of coverage and connectivity. Although various researches of the sensor network which is based on marine robots have been executed, all of the underwater, surface and aerial robots have not yet been considered in the sensor network. To solve this problem, a collaborative control method based on the acoustic information and image by the sonars of the underwater robot, the acoustic information by the sonar of the surface robot and the optical image by the camera of the static-floating aerial robot is proposed. To verify the performance of the proposed method, the collaborative control of a MUR(Micro Underwater Robot) with an OAS(Obstacle Avoidance Sonar) and a SSS(Side Scan Sonar), a MSR(Micro Surface Robot) with an OAS and a BMAR(Balloon-based Micro Aerial Robot) with a camera are executed. The test results show the possibility of real applications and the need for additional studies.

• Journal of Korea Society of Digital Industry and Information Management
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• v.5 no.3
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• pp.77-86
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• 2009

This paper proposes an ontology-based context-aware home healthcare platform employing environmental factors obtained from home. The proposed platform manages the health of home residents, and notifies relatives or a medical team of critical condition through context-awareness based on home ontology by using information sensed from various sensors. The ontology definition of context-awareness from the sensed information provides technically more precise decision for us. Therefore the platform can be aware of the health state of residents and environment by reasoning exactly from data gathered from various sensors and heterogeneous devices. The platform also can individually provide the customized service for users by setting priority for critical status that can be occurred in the health state of residents.

• Journal of Korea Multimedia Society
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• v.19 no.5
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• pp.918-923
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• 2016

IoT should be considered security risk environments such as various platforms and services including smart devices that can be mounted on household electric appliances, healthcare, car, and heterogeneous networks that are connected to the Internet, cloud services and mobile Apps.. In this paper, we provide analysis of new security threats, caused by open-platform of IoT and sensors via the Internet. Also, we present the key recovery mechanism that is applied to IoT. It results to have compatibility with given research, reduces network overhead, and performs key recovery without depending on key escrow agencies or authorized party.

• Proceedings of the KAIS Fall Conference
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• 2009.12a
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• pp.470-473
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• 2009

환경정보를 감시하기 위한 각 센서 네트워크들은 사용목적에 따라 다양한 센서를 이용하여 자가 구성적인 네트워크를 형성한다. 이전의 센서 네트워크 응용 프로그램 개발 방법은 센싱 데이터에 대한 단일화된 형식을 가지지 않았기 때문에, 온도, 습도, 조도 등의 센싱 데이터 단위나 형식이 다양하게 표현되었으므로 센서 네트워크 응용 프로그램을 개발하는데 어려움이 있다. 이러한 이유로 각 응용 프로그램에 종속적인 데이터는 다른 센서 네트워크와의 공유도 용이하지 못하다. 이에 센서 노드로부터 수집된 다양한 원데이터(raw-data)를 원활하게 교환 할 수 있는 데이터 처리 중심의 미들웨어 개발이 필요하다. 이에 우리는 센서 노드로부터 측정한 데이터 및 요구사항을 단일화 하기 위한 표현으로 XML로 작성하고, 웹을 통해 센서 데이터를 활용할 수 있는 데이터 처리 중심의 센서 네트워크 미들웨어를 제안한다.

• Proceedings of the Korean Information Science Society Conference
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• 2008.06b
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• pp.441-445
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• 2008

기존 무선 센서 네트워크 분야에서의 연구는 단일기종 환경이라는 가정하에서 진행되었다. 최근 정보수집 기법이나 라우팅 프로토콜의 경우 클러스터링 기반의 이기종 환경에서 더 높은 에너지 효율을 보이고 있다. 네트워크의 수명이 길어지고, 이를 기반으로 동작하는 응용에 대한 요구가 다양해 짐에 따라 동적 재구성에 대한 요구도 높아지고 있다. 본 논문에서는 이기종 환경을 기반으로 보다 효율적인 동적 재구성 기법을 제안한다. 제안한 기법은 무선 센서 네트워크의 특성을 반영하며, 대규모의 네트워크를 지원할 수 있도록 설계했다. 시뮬레이션 결과를 통해, 제안한 기법이 기존의 기법에 비해 우수하다는 것을 검증한다.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11b
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• pp.373-375
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• 2005

디지털 홈이 구체화되면서 실내 환경조절, 방법, 가전기기 제어, 건강 모니터링 분야에서 센서 네트워크가 활용됨에 따라 이질적인 센서 네트워크간의 정보교환에 대한 요구가 증대하고 있다. 본 논문에서는 이러한 홈 환경에서 이질적인 센서 네트워크간 정보교환을 위한 메카니즘으로 홈 서버를 이용한 상호운영성 미들웨어 구조(Interoperable Middleware Architecture)를 제안한다. 이를 위하여, 홈 서버와 센서 네트워크 미들웨어 구조를 소개하고, 미들웨어가 상호운영성을 제공하기 위한 정보교환 메시지 포맷을 정의한다. 메시지 교환 양식은 XML 문서를 이용하고, 메시지 전송을 위한 프로토콜로 SOAP(Simple Object Access Protocol)을 선정한다. 본 논문의 적절성을 검증하기 위하여 홈 환경에서 이종 센서 네트워크간 점보교환 사례연구를 실시하고 이를 통해 확장성과 유연성을 보유한 정보교환 메카니즘의 효과를 확인한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.04a
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• pp.612-614
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• 2012

센서 네트워크는 센싱 기능과 데이터 처리 그리고 무선 통신기능을 갖춘 많은 노드로 이루어져 있다. 센서 노드는 제한적인 CPU, 배터리 그리고 저장공간과 같은 제약사항을 가지고 있기 때문에 시간이 지날수록 노드의 수명이 다해 전체 적인 네트워크의 성능은 감소하게 된다. 본 논문에서는 이기종 센서 네트워크에서 노드 개수에 따른 작업 수행 시간의 분석을 통해 센서 네트워크의 수명을 판단한다. 성능 평가 결과 계층 기반의 라우팅 기법의 경우 클러스터 수의 비율이 네트워크의 수명에 큰 영향올 주는 것을 알 수 있다.

• ETRI Journal
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• v.41 no.4
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• pp.452-464
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• 2019

The use of wireless body area networks (WBANs) in healthcare applications has made it convenient to monitor both health personnel and patient status continuously in real time through wearable wireless sensor nodes. However, the heterogeneous and complex network structure of WBANs has some disadvantages in terms of control and management. The software-defined network (SDN) approach is a promising technology that defines a new design and management approach for network communications. In order to create more flexible and dynamic network structures in WBANs, this study uses the SDN approach. For this, a WBAN architecture based on the SDN approach with a new energy-aware routing algorithm for healthcare architecture is proposed. To develop a more flexible architecture, a controller that manages all HUBs is designed. The proposed architecture is modeled using the Riverbed Modeler software for performance analysis. The simulation results show that the SDN-based structure meets the service quality requirements and shows superior performance in terms of energy consumption, throughput, successful transmission rate, and delay parameters according to the traditional routing approach.