• Journal of KIISE:Computing Practices and Letters
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• v.12 no.1
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• pp.78-89
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• 2006

In development of network-enabled consumer electronics, much of the time and effort is spent analyzing and solving network performance problems. In this paper, we define an instance of such problems discovered while developing a commercial home network gateway. We then analyze its cause and propose a solution mechanism. Our home network gateway uses art asymmetric link (ADSL) and suffers from an undesirable phenomenon where downlink traffic interferes with upload speed. We call this phenomenon the network performance interference problem. While this problem can easily be confused with receive livelock caused by packet contention at the input queue, we and that this is not the case. By performing extensive experiments and analysis, we reveal that our problem is caused by packet contention at the output queue and certain intrinsic characteristics of TCP. We devise an ACK-separation queuing mechanism for this problem and implement it in the home network gateway Our experiments show that it effectively solves the problem.

• The Journal of the Korea institute of electronic communication sciences
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• v.13 no.5
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• pp.1101-1108
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• 2018

This study is a study of the school zone safety system of the platform part in which processing between device and the application, gateway function processing, and application and service function are cooperatively processed. The device part is the beacons that are supported when the student moves in the school zone. And the section of application is a service announcement that applies to smartphones. Finally, the children's protection area sign shows the number of students registered at the gateway. Gateways operate in two types. The first type is a gateway installed to identify the movement of elementary school students. The second type is a gateway to identify students who have passed through the front door of the school. The IoT platform handles various service functions, child protection area panel support and student counter processing functions.

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.07a
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• pp.193-194
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• 2018

본 논문에서는 IIoT(Industrial IoT) 환경에서 사용되는 수 천 개 이상의 센서 데이터를 효율적으로 처리하기 위하여 분산 게이트웨이 시스템을 제안한다. 이 시스템은 대량의 센서에서 측정되는 데이터를 단일 게이트웨이 단위로 처리할 때 늘어나는 작업부하와 처리 시간 지연, 신뢰성 및 정확성 저하를 해결하기 위하여 복수의 게이트웨이 간 연계를 통해 대량의 센서에서 측정되는 데이터를 실시간 처리가 가능한 게이트웨이로 지연시간 없이 균등 할당함으로써 작업부하의 완화와 처리 시간의 가속화, 신뢰성 및 정확성 확보를 이루어낼 수 있다. 본 논문에서는 단일 게이트웨이 시스템과 분산 게이트웨이 시스템의 비교를 통해 수천 개 이상의 센서에서 측정되는 데이터 처리 시간의 차이를 확인함으로써 IIoT 환경에서 분산 게이트웨이의 활용도 면에서 우수함을 보인다.

• Journal of KIISE:Computing Practices and Letters
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• v.9 no.2
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• pp.191-204
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• 2003

In the home gateway environment, several characteristics for the user authentication mechanism should be reflected separately from the existing distributed service environment. First, the platform of a home gateway is a component based system that its services are installed dynamically. Second, the convenience that user can use several services by authentication of once should be offered. Finally, the system resources of a home gateway are restricted. However, a user authentication mechanism that reflected these characteristics is not shown at the user admin service specification of the OSGi service platform.(OSGi is the representative standardization organization of hone gateway.) Also, there is no existing authentication protocol that satisfies these qualities at the same time. In this paper, we propose a new user authentication mechanism considering those characteristics for the home gateway environment. We also design and implement an independent authentication service bundle based on the OSGi service platform so that it can perform user authentication operations for each bundle service. We supplement and extend the Kerberos Protocol that can apply.

• Journal of Digital Convergence
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• v.11 no.12
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• pp.339-344
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• 2013

With the increasing number of chronic disease patients, the importance of everyday health care has grown more significant. The study researchers expected it would help for patients' health improvement and healthcare service expansion if users check their vital signs in their daily lives and send the results to a medical center's servers through a specific device automatically. This thesis, in line with this idea, seeks to develop a portable healthcare gateway. The gateway is designed in a USB type and can transmit standardized data, operating regardless of a user's location and Personal Healthcare Devices (PHDs). The developed portable healthcare gateway provides effective services in ubiquitous environments to customers, which will improve the health of chronic patients.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10a
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• pp.364-366
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• 2004

현재의 VPN 제품들은 단말의 IP 이동성을 지원하지 못하고 있다. 단말의 이동 시 단말은 새로운 IP 주소를 할당받게 되는데, VPN 게이트웨이는 단말이 초기에 등록한 IP 정보만을 가지고 있기 때문에 이동한 단말이 전송하는 패킷을 폐기하게 된다. 본 논문에서는 VPN 세션의 단절 없이 단말의 이동성을 지원하는 VPN 게이트웨이를 설계하고 구현하였다. 본 논문에서 설계한 VPN 게이트웨이는 IPv6 기반 네트워크에서 동작하며, 단말의 이동성을 지원찰기 위해 Mobile IPv6 기술과 VPN 기술을 통합하는 구조를 갖는다.

• Journal of the Korean Society for Precision Engineering
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• v.24 no.6
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• pp.23-30
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• 2007

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.05a
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• pp.232-234
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• 2012

NMEA2000 international standards was developed for real-time communication among sensors and devices in ships. This paper describes analysis of NMEA2000 network protocols and implementation of a gateway for wireless data services in NMEA2000 networks. For scalability of the network, developed gateway didn't participate in NMEA2000 network but simply relayed data between wireless devices and the network.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.10a
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• pp.488-489
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• 2009

In this paper, a FlexRay module and gateway is developed for high speed in-vehicle network. Speed of FlexRay is 10 times higher than that of CAN. In this paper, FlexRay module is implemented using MC9S12XF512 micro-controller and gateway converting CAN message to FlexRay message.

• Proceedings of the Korean Society of Computer Information Conference
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• 2016.01a
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• pp.85-86
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• 2016

본 논문에서는 IoT 환경에서 IoT 게이트웨이를 통해 제공되고 있는 서비스 탐색 프로토콜에 대한 문제점을 분석하고 이를 해결하기 위한 해결방법에 대한 방향을 제시한다. 현재 다양한 IoT 서비스 탐색 프로토콜이 제안되어 있으며 제안된 서비스 탐색 프로토콜은 IP 기반 프로토콜과 non-IP 기반 프로토콜로 구분된다. 최근 IoT 기반 홈 네트워크 서비스 제공을 위해 스마트 IoT 게이트웨이가 개발되었다. 제안된 IoT 게이트웨이는 이종 네트워크 인터페이스에 대한 프로토콜 컨버팅 기능은 제공하고 있으나 서비스 탐색에 대한 홍보기능을 제공하고 있지 않다. 따라서 상이한 인터페이스로 구성된 IoT 디바이스에 대한 서비스 탐색 기능을 제공하지 못한다. 본 논문에서는 이런 문제점을 정의하고 이를 해결하기 위한 IoT 게이트웨이 내부 기능을 정의하고 추가적으로 공통 IoT 서비스 탐색 프로토콜 개발에 대한 방향을 제시한다.