• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.576-578
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• 2016

Various smart home IoT devices and services while the Internet of things is the development has been provided. The core of the smart home IoT service is that user control the device via the Internet communication. Communication of IoT devices, because most with an IP address within the private network, there is a difficulty in the remote control to control access from outside the network. Any of the methods for remote control, to determine the IP address of each other, there is a UDP hole punching for communication. To ensure the data communication success rate closed to 100%, the UDP hole punching must undergo a process of three stages in some cases. In this paper, to provide a system for managing the remote control policy based on the CEP in order to omit the unnecessary steps on the remote control of IoT devices using UDP hole punching.

• Proceedings of the IEEK Conference
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• 2004.08c
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• pp.549-551
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• 2004

This paper used OPNET to simulate video streaming service a test IP network and MPLS network with the traffic shaping that have with CQ_ LLQ algorithm, LSP of fixed bandwidth, policy of limitation users and measures parameters such as delay, throughput, packet loss. To verify the performance of video streaming service in IP network and MPLS network, two scenario that have same topology and traffic source. One is the simulation for best-effort service in pure IP network. The other is the simulation for QoS-enabled service in MPLS Network. Based on simulation result, the MPLS network with CQ_ LLQ algorithm and fixed LSP show advantage of the video streaming service QoS, specially delay and packet loss

• Proceedings of the IEEK Conference
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• 2000.06c
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• pp.105-108
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• 2000

As Internet and WWW grow rapidly, the role of web servers is getting more important, and the number of users in a few popular site is also explosively increasing. Load balancing in clustered web server systems is important task to utilize whole system effectively, so dynamic load balancing is required to overcome the limit of static load balancing. In this paper, we propose two dynamic load balancing schemes, and analyzed load model and Performance improvement and also compare existing load balancing methods and IP filtering method. In case of load balancing with threshold, little extra traffic was required for better performance, but in case of load balancing with load weight, we found that the performance mainly depends on information exchange rate.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10c
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• pp.661-663
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• 2001

무선 데이터 서비스를 통한 사용자의 급속한 증가는 이동 단말의 증가 및 멀티미디어 응용이 가능한 이동 장치의 성능 증가, 높은 데이터율의 무선 액세스 기술 등 다양한 환경을 변화시켰다. 본 연구에서는 IP 이동망에서의 종단 사용자(End-User)의 서비스 보장을 위해 QoS(Quality of Service) 제어 메커니즘을 분석하여 QoS 정책 관리 구조를 제안하였다. 이 구조는 유선과 IP 이동망과의 복합적인 네트워크에서의 사용자 정책 기반 통합 지원 구조로 구성되며, 해당 자원에 대한 서비스를 구분하여 사용자 정책을 관리하며, 팀 이동망을 고려하여 단위 네트워크의 QoS 관리 서버를 중하여 종단 사용자의 QoS 정책을 관리하게 된다. 본 논문에서 제안한 구조는 종단 사용자 정책을 관리하는데 있어 응용 서비스 고유의 특성을 보장하며 사용자 정책에 따른 서비스 자원을 통함 관리할 수 있다.

• Electronics and Telecommunications Trends
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• v.20 no.5 s.95
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• pp.116-126
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• 2005

인터넷전화 서비스의 원활한 제공을 위해 세계 여러 국가와 표준화 기구에서는 E911과 같은 긴급통신서비스 제공을 위한 정책 수립 및 기술표준화 활동을 수행하고 있다. 2005년 5월 미국 FCC가 인터넷전화 사업자의 E911 서비스 제공을 촉구하는 결정을 내린 바 있으며, 캐나다, 유럽, 아시아 등에서도 관련 정책을 마련하고 있다. IP 기반의 긴급통신서비스 제공과 관련된 표준화 활동은 IETF의 여러 WG과 NENA, TIA, ITUT등의 기구에서 진행되고 있으며, 특히 IETF ecrit WG에서는 인터넷 기술을 이용한 비상 호 라우팅을 위한 요구사항 개발 관련 작업이 이루어질 예정이다. 본 문서에서는 이와 같은 세계 여러 국가와 기구의 정책 및 표준화 활동을 비롯하여, 911 서비스를 제공하는 것으로 밝히고 있는 해외 인터넷전화사업자의 서비스 제공 동향에 대해 살펴본다.

• Journal of IKEEE
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• v.23 no.4
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• pp.1203-1207
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• 2019

As the number of IP cores has been increasing in a System-on-Chip (SoC), multiple routers are included in on-chip-networks. Each router has its own arbitration policy and it is difficult to obtain a desired arbitration result by combining multiple routers. Allocating desired bandwidths to the ports across the routers is more difficult. In this paper, a guaranteed bandwidth allocation scheme using an IP-level QoS control is proposed to overcome the limitations of existing local arbitration policies. Each IP can control the priority of a packet depending on the data communication requirement within the allocated bandwidth. The experimental results show that the proposed mechanism guarantees for IPs to utilize the allocated bandwidth in multiple router on-chip-networks. The maximum error rate of bandwidth allocation of the proposed scheme is only 1.9%.

• Journal of Digital Convergence
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• v.10 no.6
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• pp.259-267
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• 2012

Internet telephony is an Internet service which supports voice telephone using VoIP technology on the IP-based Internet. It has some advantages in that voice telephone services can be accompanied with multimedia services such as video communication and messaging services. Recently, the introduction of smart phones has led to a growth in social networking services and thus, the research and development of Internet telephony has been actively progressed and has the potential to become a replacement for the telephone service that is currently being used. In this paper we designed and implemented an Internet telephony network system which is developed by using Asterisk and open source softwares. It is developed on the linux system and has some features such as VoIP telephony service between SIP phones, voice mail, and call recording. It also supports web-based functions such as SIP users and server system management that is implemented by Apache web server and PHP programs. Afterwards, this system will be applied as VoIP network base technology for small sized companies and organizations. It will paly a role for encouraging companies to use open source softwares.

• Journal of Digital Convergence
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• v.13 no.5
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• pp.159-167
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• 2015

The nature of port logistics requires global visibility and traceability. However, the traditional RFID technology still applied cannot meet these demands. IP-USN and M2M in port logistics have faced challenges of the prerequisite of network composition and immense communications at the base where a grand number of containers are installed. To resolve the issue, this study suggests an IP-RFID-based smart port logistics service platform. The IP-RFID-based port logistics service system resolved the communication problem by separating the RFID tag and AP, which allows internet connection, from the tag. The tags connected with thermo-sensors, humidity sensors, pressure sensors, GPS, etc. are attached to the containers insuring global visibility and traceability, key factors in logistics, by obtaining desired real-time information regardless of time and location.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.8
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• pp.1780-1784
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• 2015

Traditional IP routing, see only the Destination Address When Forwarding Layer 3 routing and exchange information and Destination-Based Routing Lookup is required for all Hop. Thus, all routers Full Internet routing information, the route information of more than about 120,000 may require. Therefore, the router configuration, which can be dispersed in the environment, the traffic load is required in accordance with this congestion. In this study, a unique characteristic of the Internet in the environment of an existing network Best Effect for QoS guarantee and hardware high speed switching of large multimedia data transmitted using a Labeling for forwarding a packet environment configuration is required. Video Stream Broadcast Transport Labeling rather than in much of the higher performance of the multi-step policy to most of the Video Stream Packet deulim was fixed to Labeling Header Format proposes a method of applying an effective QoS policy to a more simplified policy.

• The KIPS Transactions:PartC
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• v.10C no.5
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• pp.595-602
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• 2003

In this paper, we proposed new buffer management and cell scheduling scheme of GFR service for improving fairness of TCP/IP traffic in ATM networks. The proposed algorithm used untagged cell, which came to ATM switch, to decide the policy for discard of frame and what kind of VC cell it would serve. Performance analysis through the simulation present that proposed scheme can meet fairness 2 (MCR Plus equal share), which are not met by conventional scheduling mechanism such as WRR. Also, proposed scheme is superior to WRR about 30% in throughput and more efficiency in fairness criteria.