• Proceedings of the Korean Information Science Society Conference
• /
• 2005.07a
• /
• pp.316-318
• /
• 2005

본 논문에서는 자동차 관리 및 진단, 차량 편의시설 제어 등의 보다 향상된 텔레매틱스(Telematics) 서비스 제공을 위해 자동차 내의 네트워크과 사용자의 모바일 단말기 및 외부 서비스 망에 접속한다. 텔레매틱스 응용 서비스 구현을 지원하는 소프트웨어 플랫폼이 내장된 텔레매틱스 서비스 게이트웨이를 설계 구현한다. 제안되는 텔레매틱스 서비스 게이트웨이는 리눅스 플랫폼 상에서 CAN(Controller Area Netwrok) 버스, 블루투스, CDMA 모듈 및 GPS 등이 탑재되고, 일관된 텔레매틱스 응용 서비스 구현 및 개발을 위한 소프트웨어 플랫폼을 제공한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2013.05a
• /
• pp.954-956
• /
• 2013

IOS/IEEE 11073 PHD 표준들은 u-헬스 측정기기와 u-헬스 게이트웨이간의 통신을 가능하게 하도록 설계되어 있다. 모바일 단말기를 데이터 취합을 위한 중계기로 활용하고 별도의 게이트웨이를 구성하여 헬스케어 의료기기를 연동하고 모니터링을 위한 인터페이스를 제공해 왔으나 스마트폰 애플리케이션 단계에서 IEEE 11073 플랫폼을 포함하여 헬스케어 의료기기를 활용하는 u-헬스케어 서비스를 제공하기에는 많은 제약이 있다. 이에 본 논문에서는 Android 4.0.x OS 스마트폰을 대상으로 Bluetooth HDP을 활용하여 u-헬스케어 시스템에서의 게이트웨이/서버 플랫폼 기능을 포함하는 헬스케어 의료기기의 모니터링 애플리케이션 시스템을 설계하였다.

• Journal of the Institute of Electronics Engineers of Korea TC
• /
• v.43 no.6 s.348
• /
• pp.39-45
• /
• 2006

n a hybrid ad-hoc network, wired network and a mobile ad-hoc network are connected by the internet gateway. To provide seamless service for internet users in the hybrid ad-hoc network, an efficient internet gateway selection technique and a fast handover technique are needed. In this paper, we propose a seamless handoff technique for providing mobility of mobile hosts in hybrid ad-hoc networks. The proposed internet gateway re-registration algorithm improves general handoff performance. Moreover, the handoff processing time within certain range of area is reduced by using mobility management agent(MMA). In addition the packet loss is reduced when handoff occurs out of the range of MMA by tunneling technique.

• Journal of Korea Spatial Information System Society
• /
• v.10 no.3
• /
• pp.45-54
• /
• 2008

This paper designs and Implements a connectivity analyzer for the hybrid vehicular network based on the real-life movement history data achieved from the Taxi telematics system currently in operation, aiming at providing a useful guideline and information to build a telematics network. The simulator traces the location of each vehicle, sets the vehicle type, either gateway or normal, decides whether it can be connected to a mobile gateway, keeps track of status of the vehicle, and calculates the duration of disconnected state. With this analysis considering the transmission range and gateway ratio, we can decide the cost-effective number of mobile gateways having both cellular and ad-hoc network interfaces, and buffer space requirement based on the measured disconnection time and message generation ratio.

• The KIPS Transactions:PartC
• /
• v.12C no.4 s.100
• /
• pp.589-596
• /
• 2005

The objective of this paper lies in the design and implementation of a home gateway supporting live video streaming which flows from the Non-SIP video camera in home to the mobile SIP device outside. We developed the home gateway on the OSGi framework and employed the RTC technology which embeds an SIP stack so that the multimedia session can be established from the home device to the mobile user outside. And also we developed an RTC bundle to manage the session and a virtual capture device driver to read the video stream from the Non-SIP video camera in the home network, and installed them on the home gateway. Finally, we constructed the experimental environment that has the windows messenger as the SIP mobile device and an AXIS 2100 UPnP video camera as a video source, and then tested if the session establishment to the mobile user from the camera and live video streaming work well between them.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.20 no.11
• /
• pp.2119-2124
• /
• 2016

The Internet of things (IoT) needs to be an event-driven approach for efficient related time response and processing. The growth of mobile devices in Internet of Things (IoT) leads to a number of intelligent buildings related IoT applications. For instance, home automation controlling system uses client system such web apps on smartphone or web service to access the home server by sending control commands. The gateway based RESTful technology responsible for handling clients'requests attests an internet latency in case a large number of clients' requests submit toward the gateway increases. In this paper, we propose the design tasks of the IoT gateway for handling concurrency events. The gateway based event-driven architecture is designed for building IoT gateway using node.js on one side and communication protocol based message-oriented middleware known as XMPP to handle communications of intelligent building control devices connected to the gateway through a centralized hub.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.25 no.4
• /
• pp.334-341
• /
• 2015

This paper develops a new system for remotely monitoring and controlling the windows and doors in mobile environment. We design and implement the opening and shutting unit, the gateway, and the control server system, respectively. The opening and shutting unit consists of the driver using DC motor and the motion controller which monitors the state and transfers the control information. The gateway supports TCP/IP and CDMA protocol, which is the interface of wire and wireless communication for transferring the current state and control information. The control server consists of the program to store and process the control information, the middleware to support the processing of various state message, and DB for monitoring the state and remotely controlling the system. Especially, an application software and the Web-based user interface have also been developed to support the mobile environment. The operation performances, environment influences, driving persistences, and operation failure ratio, which are based on PC and smart-phone, have been tested in 2 authorized agencies. The test results show that the developed system has a superior performance.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.16 no.9
• /
• pp.1970-1976
• /
• 2012

Home healthcare system has lot of things to do for the integration with medical instruments in the sense of standardization. We will design and implement mobile healthcare system based on smart gateway thru adaptation of ISO/IEEE 11073, and HL7 standard. And also we are willing to research heart rate monitor, pulse-oxygen meter and ECG monitor in order to develop mobile healthcare system for medical appliance. We studied the connection of standard medical devices, i.e, continua health alliance under the Android 4.x Bluetooth HDP(Health Device Profile) environments. We also tried to implement healthcare system which can support diagnosis for healthcare provider and user based on HL7 standard.

• Journal of the Korea Society for Simulation
• /
• v.25 no.3
• /
• pp.1-14
• /
• 2016

This paper proposes four general wireless gateway types, which are distinguished by their own processing ways to connect between a wireless sub-network of things and the mobile internet that links mobile network to internet step by step. In this paper, we also design general processing procedures of these four types using the state transition model. Gateways of each types were developed on the basis of the resulted state transition models and their performances were evaluated through several tests, analyzed, and compared each other. As the results of our evaluation, compared with the other types, the type, which combines both of a low-power Sleep-interrupt way and polling ways for receiving data or responses in all the waiting states of a gateway, shows the best performance in all of data transmission real-timeliness, data loss and energy consumption.

• Proceedings of the Korea Multimedia Society Conference
• /
• 2004.05a
• /
• pp.483-486
• /
• 2004

기존의 SVG 파일은 모바일 디바이스에 맞추어 제작하더라도, 디바이스에 따라 사이즈 조절이 되지 않아, 이미지가 전체적으로 보여지지 않는다. 그래서 각 SVG 파일을 해당 디바이스의 디스플레이에 맞춰서 다시 제작해야하는 어려움이 있다. 본 논문에서는 위의 문제점을 해결하기 위해 SVG Trans-Gateway를 제안한다. 이 SVC Trans-Gateway는 모바일 디바이스 기준으로 데스크탑 PC에서 제작된 SVG 파일을 요청하는 해당 디바이스의 정보를 분석하여, 각 디바이스의 디스플레이에 맞추어 변환해주는 게이트웨이 이다. 그래서 이 시스템은 각 디바이스의 화면 해상도에 따라, 동일한 SVG 파일을 변환해주는 기능을 수행한다.