• Journal of Satellite, Information and Communications
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• v.11 no.3
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• pp.37-42
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• 2016

In this paper, in today's highly complex video and broadcast operations, broadcasters are constantly challenged to reliably deliver low-latency, high-quality video to multiscreen audiences on-air and online. The Adaptive Bit Rate (ABR) protocols enable internet video to a wide range of multiscreen devices. However, video quality is often marginal and would prove unacceptable for valued linear broadcast content delivered to the Big Screen today. The Media information processing technology advances in ABR enables service providers to take control and offer quality managed linear video services to ALL screens in the home, including the Big Screen, with a single unified IP Video infrastructure. The New Multiscreen-Assisted ABR (MSA-ABR) delivery management system proposed using Cloud based multicast-assisted ABR for a broadcast facility that performs routing of contribution content and online publishing services within a virtual, centralized cloud infrastructure.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.6
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• pp.73-80
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• 2011

In this paper, we design and implementation of effective remote management system for VoIP(Voice over IP) terminal. Ordinary VoIP terminal is connected inside of NAT(Network Address Translation) assigned private IP address. NAT provides address mapping between outside public IP address and inside private IP address, for outside system telephone call is connected to inside VoIP terminal. In this paper, we also design and implementation of UDP hole punching function that the outside calls pass through the NAT, for outside management system call is connected to internal VoIP terminal, and gathered to management information of the VoIP terminal. Also, we evaluated and analysed of developed system in the test environment. As a result of test, It showed that it was well performed without any data error and data loss in the connectivity, and It showed that it was well gathered management information of the VoIP terminal.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.11B
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• pp.1732-1737
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• 2010

Currently, one of the main purposes of the military using Unmanned Air System (VAS) is to perform surveillance and reconnaissance of hostile enemy. To carry out their mission, Unmanned aerial vechicle (UAV) transmits video images to ground control station using ISR devices installed on the UAV. After receiving the images, the ground control station distribute them to various type of users. At this case, it is important to keep QoS. This paper presents data delivery and QoS managements using DDS for DDS for UAV video images. The experiment result, based on H.264 and JPEG2000, shows that DDS standard is able to be applied to video image transmission for UAS.

• Journal of KIISE:Information Networking
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• v.37 no.3
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• pp.198-203
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• 2010

In this paper, a new routing protocol is proposed to manage selfish nodes which make a strategic choice to maximize only their own profits. To provide incentives to nodes on the path, VCG mechanism is introduced. Therefore, based on the collaborative actions among nodes, the entire network performance can be improved. With a simulation study, the proposed scheme can approximate an optimized solution while ensuring a well-balanced network performance under widely diverse network environments.

• 한국정보통신설비학회:학술대회논문집
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• 2003.08a
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• pp.112-114
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• 2003

MPLS/VPN서비스는 MPLS망의 인프라를 이용하여 사설망을 제공하는 서비스로 각 VPN사이트사이를 고속의 LSP를 이용하여 연결한다. MPLS/VPN서비스는 차별적인 다양한 서비스 품질을 지원하는 것이 용이하며, 또한 서비스 도입과 운용 및 관리가 용이하여 저비용으로 VPN서비스를 제공할 수 있는 장점을 가지고 있다. 본 논문에서는 초고속 국가망에 도입될 예정인 ATM/MPLS MSR40시스템을 이용하여 MPLS/VPN망을 구축하기 위해 요구되는 라우팅 프로토콜상에서의 설정 및 고려사항을 설명한다. 현재 시험서비스중인 MPLS네트워크 구축 사례를 바탕으로 하여 MPLS 도메인 내부 라우팅 설정 절차 및 가입자측 라우팅 설정 절차에 대해 설명하고 또한 MPLS망의 특성상 요구되는 몇가지 라우팅 이슈에 대해 설명한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.10a
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• pp.133-137
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• 2001

급속한 인터넷의 확산으로 인해 다양한 멀티미디어 응용 서비스들이 등장하였다 영상회의, 인터넷 방송, VOD등과 같은 실시간 인터넷 멀티미디어 서비스들은 고속의 데이터 전송과 QoS 그리고, 멀티캐스트를 요구한다. 인터넷의 하부구조인 ATM 망에서 IP 멀티캐스트를 지원하기 위한 방안으로 MARS가 제안되었으며, 또한 최선형 서비스 기반의 인터넷에서 서비스의 품질을 보장하기 위하여 자원예약 신호 프로토콜인 RSVP가 제안되었다. 본 논문에서는 단일 MCS기반의 MARS가 가지는 문제점들을 보완하기 위해 2개 이상의 MCS를 가지는 다중 MCS MARS기반의 ATM 망에서 클러스터 내의 ATM 호스트가 특정 IP 멀티캐스트 그룹에 가입할 경우 MARS가 종단간 전송지연을 최소화하는 MCS를 할당하여 송신자와 수신자간에 최소의 전송지연을 가지도록 하고, MARS가 Resv 메시지를 수신했을 때, 자원예약 메시지를 처리할 수 있도록 그 기능이 확장된 MARS는 유지하고 있는 MCS 관리 테이블을 참조하여 MCS를 재 선정함으로써 인터넷 서비스의 QoS를 유지하고, MARS와 MCS의 처리 부하를 줄일 수 있는 방안을 제시하고자 한다.

• Journal of KIISE:Information Networking
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• v.29 no.4
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• pp.358-367
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• 2002

The IETF Differentiated Services (Diffserv) WG focused on Providing service differentiation on the Internet. One problem of the Diffserv Assured Services (AS) architecture is that it cannot guarantee fairness and throughput assurance. In this paper, we propose two schemes for guaranteeing fairness among the various target rates in the AS architecture. One is a variant of RED with IN and OUT (RIO), called the improved RIO (IRIO). The other is a variant of Time Sliding Window (TSW), called the improved TSW (ITSW). To validate the Proposed schemes, their behaviors are then examined under various simulation environments. The simulation results showed that IRIO and ITSW improved fairness and the throughput assurance in the AS architecture.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.16 no.5
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• pp.256-264
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• 2023

Smart farm technology using IoT is one of the technologies that can increase productivity and improve the quality of agricultural products in agriculture, which is facing difficulties due to the decline in rural population, lack of rural manpower due to aging, and increase in diseases and pests due to climate change. . Smart farms using existing IoT simply monitor farms, implement smart plant growers, and have automatic greenhouse opening and closing systems. This paper implements a smart farm system based on MQTT, an industry standard protocol for the Internet of Things, and Node-RED, a representative development middleware for the Internet of Things. First, data is extracted from Arduino sensors, and data is collected and transmitted from IoT devices using the MQTT protocol. Then, Node-RED is used to process MQTT messages and store the sensing data in real time in MongoDB, a representative NoSQL, to store the data. Through this smart farm system, farm managers can use a computer or mobile phone to check sensing information on the smart farm in real time, anytime, anywhere, without restrictions on time and space.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.9 no.6
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• pp.151-158
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• 2010

In line with the requirement of appropriate protocol support for such mission-critical wireless sensor network (WSN) applications as patient monitoring, we investigate the framework for designing medium access control (MAC) schemes. The data traffic in medical systems comes with inherent traffic heterogeneity as well as strict requirement of reliability according to the varied extents of devise-wise criticality in separate cases. This implies that the quality-of-Service (QoS) issues are very distinctly delicate requiring specialized consideration. Besides, there are features in such systems that can be exploited during the design of a MAC scheme. In a monitoring or routine surveillance application, there are degrees of regularity or predictability in traffic as coordinated from a node of central control. The coordinator thus takes on the role of marshaling the resources in a neighborhood of nodes deployed mostly for upstream traffic; in a collision-free scheme, it schedules the time slots for each superframe based on the QoS specifications. In this preliminary study, we identify the key artifacts of such a MAC scheme. We also present basic performance issues like the impact of superframe length on delay incurred, energy efficiency achieved in the network operation as obtained in a typical simulation setup based on this framework.

• Convergence Security Journal
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• v.12 no.3
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• pp.75-83
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• 2012

Recent science technology research network moves to establish logical private network among specific research groups such as high energy physics and climate, requiring to implement private network by group for each purpose. Up to now, national research networks such as KREONET service high capacity logical private networks. Therefore standardized configuration and management scheme is essential for the deployment of logical private network. In this study, we propose the core service element and protocols for the logical networks over Layer 2 networks. We also propose system architecture that make monitoring and management easier. After that we design and implement monitoring map for logical network based on scheme. For this purpose, we also propose the description system for logical research network to provide data such as operation information, formation information, performance information and failure information of network infrastructure resource.