• The Transactions of the Korean Institute of Electrical Engineers D
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• v.53 no.9
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• pp.638-643
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• 2004

Middleware enables different networking devices and protocols to inter-operate in ubiquitous home network environments. The UPnP(Universal Plug and Play) middleware, which runs on a PC and is based on the IPv4 protocol, has attracted much interest in the field of home network research since it has versatility The UPnP, however, cannot be easily accessed via the public Internet since the UPnP devices that provide services and the Control Points that control the devices are configured with non-routable local private or Auto IP networks. The critical question is how to access UPnP network via the public Internet. The purpose of this paper is to deal with the non-routability problem in local private and Auto IP networks by improving the conventional Control Point used in UPnP middleware-based home networks. For this purpose, this paper proposes an improved Control Point for accessing and controlling the home network from remote sites via the public Internet, by adding a web server to the conventional Control Point. The improved Control Point is implemented in an embedded GNU/Linux system running on an ARM9 platform. Also this paper implements the security of the home network system based on the UPnP (Universal Plug and Play), adding VPN (Virtual Private Network) router that uses the IPsec to the home network system which is consisted of the ARM9 and the Embedded Linux.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.11C
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• pp.1-9
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• 2001

The Mobile IP protocol allows IP hosts to move between different networks without changing their IP addresses. The Mobile IP systems supporting the local registration were introduced to reduce the number of times when a home registration with the remotely located Home Agent is needed. The local registration Mobile IP protocol enhanced the performance by processing the MN\`s registration requests at a local agent. However. the local registration approach may consider other aspects of the Mobile IP systems as the FA fault tolerance. In this paper, we will briefly review previous protocols to support the FA fault tolerance in hierarchical local registration Mobile If system and will propose a fault tolerance protocol with backup FA in hierarchical local registration mobile IP t() enhance the efficiency of such systems against Foreign Agent failures.

• IEMEK Journal of Embedded Systems and Applications
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• v.13 no.3
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• pp.133-141
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• 2018

There are increasing interests on smart home systems. However, most of the existing works focus on the functionality itself. In this paper, we propose an extensible smart home system based on low power networking such as CoAP, 6LoWPAN, and Zigbee. The proposed home IoT system consists of Home APP, Home Server, Home Broker, and Power Devices. Each component of the system is connected by the low-power network technologies aforementioned. As the end device, Power Device senses the current consumption of the attached appliance and controls the power to it. Power Device reports the sensing data to Home Server via Home Broker. The Home Broker enhances the scalability of the system. Home Broker extends the service area and the user's services, and it manages the connection of the underlying devices and processes, and transmits data to Home Server from Power Devices. Through the experimental evaluation, we show that the proposed system achieves the design goals such as extensibility and low power networking.

• Proceedings of the KIEE Conference
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• 2003.07a
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• pp.274-276
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• 2003

전력선 통신은 새로운 통신전용 선로나 별도의 추가 시설 없이, 기존의 전력 공급용 전력선로를 통신선로로 병용할 수 있다는 장점을 갖고 있다. 하지만 이러한 전력선 통신은 다양한 부하의 운전과 빈번한 부하의 기동 정지로 인하여 잡음이 발생하며 이에 본 연구에서는 전력선 채널의 협대역 잡음에 대처하는 변조방식을 제시함과 동시에 최근 들어 고용량 데이터 전송이 빈번한 홈 네트워크분야에 응용될 수 있는 고속 전력선 통신 기법을 제안하고자 한다. 본 논문에서 제안한 전력선 통신의 변조기법은 현재 무선 LAN에서 보편화된 변조방식으로 적용되고 있는 IEEE 802.11b의 CCK(Complementary Code Keying) 변조 방식이다. 채널 모델링은 댁내 전력선망을 기준으로 $10kHz{\sim}30MHz$ 대역에서의 전력선로 및 가정용 부하 특성에 기초한 모델링을 하였고 전력 계통 과도해석 소프트웨어인 PSCAD로 채널 모델을 구성하여 홈네트워크 환경에서의 전력선 통신의 신호 특성을 분석하였다.

• Proceedings of the KIEE Conference
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• 2007.10a
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• pp.495-496
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• 2007

본 논문에서는 전력선 통신 모뎀에 필수적으로 사용하고 있는 AC 커플러의 대기모드 상태에서의 저전력 AC 커플러 개발에 관한 것으로, 전력선 통신(PLC : Power Line Communication) 모뎀은 디지털 가전기기를 위한 지능형 홈 네트워크 구축은 물론 원격검침 등의 각종 자동화 시스템에 활발하게 적용됨에 따라 저전력 대기모드 지원의 필요성이 요구되고 있다. 이러한 요구를 충족시키기 위해서 본 논문에서는 전력선 통신 모뎀에 필수적으로 사용하고 있는 AC 커플러의 대기모드 상태에서의 저전력 AC 커플러를 위해 1차측 AC 커플러를 송신측과 수신측으로 분리하여 설계하였다. 또한 수신 커플링 회로의 경우 현재 이용되고 있는 커플링 회로의 차단주파수를 10kHz에서 전력선 모뎀의 캐리어주파수에 영향을 미치지 않는 70kHz 고역 통과필터로 설계한다. 본 논문에서는 다양한 Simulation 및 실험을 통하여 제안된 AC 커플러가 기존 전력선 통신 모뎀과 동일한 성능을 유지하면서, 대기시 소모되는 소비전력을 크게 감소시켜, 기존 전력선 모뎀에 제안된 AC 커플러로 대치할 수 있음을 실험을 통해 규명하고 입증하였다.

• The KIPS Transactions:PartA
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• v.11A no.2
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• pp.181-188
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• 2004

Recently most of the study about home-networking middleware take the way of web-control through the internet. Although the way of control using wire and PDA also be taken, but does not use standard techniques like UPnP and is limited in the technique controlling simple device. This paper is about the development of a Voice Gateway controlling many kinds of UPnP controlling devices connected to network. voice gateway is consisted of MPC850 module and phone interface and the set-top box, a part of computer in voice gateway is consisted of PSTN interface, information controlling process and the process of UPnP protocol. And I tried to implement this through entire system board.

• The Transactions of the Korean Institute of Electrical Engineers D
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• v.52 no.12
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• pp.696-701
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• 2003

This paper presents a systematic method of probing channel characteristics and communication reliabilities of home power line communication network applied to the Internet accessed control of home appliances. The effects of the three performance deterioating factors, i.e., additive noise, channel attenuation, and intersymbol interference, can be systematically measured by applying the channel probing waveform in the frequency range from 100KHz to 450KHz. Probability of bit error is derived with the probed channel parameters of the signal attenuation, noise and signal-to-interference ratio read in the frequency domain. The agreement between the derived probability of bit error and the measured probability of bit error supports the validity of the proposed approach of probing home power line channel characteristics. The experimental results performed with the constructed test-bed applying the proposed channel probing method also support the feasibility of commercially deploying the PLC modem installed home appliances and their services for the Internet accessed home automation.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.733-736
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• 2006

As various mobile technologies, sensor technologies, remote control and network infrastructure are developing and expectations on quality of life are increasing, a lot of researches and developments on home network technologies and services are actively on going. Until now, home network is just beginning, and we are developing home network services necessary to users, incrementing easiness, however we need to research on the safety of home network system guaranteeing the easiness as the services are going actively. So, in this paper, we propose the access control mechanism for protecting the home network system against indoor/outdoor illegal accesses and unauthorized accesses.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.21 no.2
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• pp.55-60
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• 2021

As the smart factory progresses, the use of automation facilities and robots is increasing. Also, with the development of IT technology, the utilization of the system using voice recognition is also increasing. Voice recognition technology is a technology that stands out in smart home and various IoT technologies, but it is difficult to apply to factories due to the specificity of factories. Therefore, in this study, a method to control an industrial articulated robot was designed using voice recognition technology that considers the situation at the manufacturing site. It was confirmed that the robot could be controlled through network protocol and command conversion after receiving voice commands for robot operation through mobile.

• Proceedings of the Korea Contents Association Conference
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• 2006.11a
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• pp.469-473
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• 2006

Nowadays, to realize ubiquitous computing environment, many research activities have been going on within various kinds of research domains including automatic identification, sensor network, home network, telematics and so on. Especially, RFID middle-ware that supports the aggregation of RFID tag data, control and management, and the integration with legacy systems has recently gained a lot of attention. Meanwhile, EPCglobal defined an ALE(Application Level Events) standard specification, which exists between RFID readers and applications, and substitutes the previous systems called Savant. In the specification internal structures and implementation technologies of ALE are not mentioned and only external interfaces are defined. This approach easies the verification of standard compliance and inter-operability of the layer. In this paper, we present the design of ALE-compliant RFID middle-ware systems that process RFID tag data efficiently.