• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.7
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• pp.1501-1505
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• 2004

The authentication system of high-speed internet in IP-infra is not warm enough to administration of systematic authentication information for user's legalization, connection right and resources allocation in order to both methods of authentication-unauthentication connection system according to transmission method . Also unauthentication connection raises a difficulty condition to user's needs satisfaction in order to a load weighting of system and network and a drop of transmission speed. Accordingly, this study brings forth authentication system construction in a high-speed IP infrastructure using spam sever able to construct the suitable network condition according to unifying authentication-unauthentication system for single authentication system.

• Journal of KIISE:Computing Practices and Letters
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• v.8 no.6
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• pp.727-735
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• 2002

In this paper, we design and implement a MPLS based IP-VPN service module as an application for ACE2000 MPLS system. ACE2000 MPLS VPN service module has been developed using the BGP4 extension protocol. The IP-VPN service module supports differentiated QoS using the MPLS traffic engineering. In addition, it offers a path protection mechanism and the restart mechanism of MPLS system and forwarding engine for supporting a highly reliable service.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.10
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• pp.2121-2128
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• 2011

Binary CDMA is a new standard technology for wireless communication developed by Korea that makes high speed communications and good quality of services. In this paper we researched on the development methods and design of a wireless VoIP system based on the Binary-CDMA technology that makes it freely installed in any place without phone cables and laying works.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.05a
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• pp.1077-1078
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• 2010

• Journal of the Korea Society of Computer and Information
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• v.13 no.1
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• pp.143-151
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• 2008

Execute IP traceback at this paper as target an intruder's attacking that Bypass Attack in order to avoid an exposure of own Real IP address Design IP traceback server and agent module, and install in Internet network system for Real IP traceback. Set up detection and chase range aggressive loop around connection arbitrariness, and attack in practice, and generate Real IP data cut off by fatal attacks after data and intrusion detection accessed general IP, and store to DB. Generate the Forensic data which Real IP confirms substance by Whois service, and ensured integrity and the reliability that buy to early legal proof data, and was devoted to of an invader Present the cyber criminal preventive effect that is dysfunction of Ubiquitous Information Society and an effective Real IP traceback system, and ensure a Forensic data generation basis regarding a judge's robe penalty through this paper study.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2018.11a
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• pp.186-189
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• 2018

KBS는 차세대 방식인 IP전송 기술을 UHD방송에 적용하기로 결정하고 2017년 9월부터 2018년 3월까지 약 7개월에 걸쳐 ALL-IP UHD부조정실 구축을 완료했다. 이후 약 3개월간의 시뮬레이션 기간을 거쳐, 현재 KBS 1TV '아침마당'과 '무엇이든 물어보세요' 를 생방송으로 제작하고 있고 KBS 2TV '그녀들의 여유만만'을 녹화 제작하고 있다. 본 논문은 UHD비디오신호와 오디오신호를 ALL-IP로 전송하기 위해 참조한 표준기술과 각 파트별 구축 세부내용을 소개한다. 또한 향후 지속적으로 발전할 IP제작 시스템에 대해 효율적인 계획과 대응을 할 수 있도록 구축사례에 대한 경험을 결론으로 논한다.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.45 no.6
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• pp.60-67
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• 2008

At present, RFID system is highly welcomed as a substitute system with its bar code recognition system and self recognition equipment. Consequently, the system has multi applications and can be complementing to its security. In particular, RFID system is significantly related with electronic transaction equipments : transportation card, ID card in check point, attendance sheet. Based upon these characteristic, the system is becoming extremely popular in the field of logistics, harbor and stock management, animal control and product circulation & distribution. In this dissertation, I would like to present a more efficient and stable remote entry control system with the network-based TCP/IP. It is a simple example of ubiquitous computing function. Above all, approved protocol system should be applied to the remote entry control function. Its efficient function with the applied approval protocol based-remote entry control system should be confirmed. Therefore, a preliminary test should be prerequisite in automatic entrance function with the embedded and TCP/IP-based RFID system.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.19 no.5
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• pp.45-57
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• 2009

In this paper, we implemented the conference system based on DTLS for saving securely the VoIP, which is served sprightly in the latest, securely and tested (and also analyzed) the system. As VoIP technology development, demand of conference system is increased and the related technologies are growed. But Security protocol to protect conference service is getting late than conference technology. In this paper, we studied based on DTLS protocol that can provide function of signaling, channel security, media channel security and application of group key and apply to VoIP conference system based UDP unchanged. In this paper, we searched suggested security protocols based on DTLS can apply to conference system and implement and apply the protocol to conference system. And we tested (and also alayzed) overhead of encryption and key management mechanism.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.42 no.1
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• pp.81-89
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• 2005

In this paper, we have described the implementation of a practical simulation tool to design and analyze communication networks. Especially, this study is focused on the implementation and application methods of a simulator supporting VoIP The key characteristics of this particular system are its easy and intuitive usage, the real behaviors implementation of equipment and protocols, the actual generation and transmission of traffic for simulation, supporting of VoIP and so forth. Our system is distinguished from the existing tools which define only the nature of voice traffic, process those packets in the same way as general data, and analyze only the quality of packet transmission such as delay. Our tool presented in this paper generates and processes packets in different way according to the types of traffic distinguishing call signal from voice information traffic. Also, we equipped this system with the various devices such as VoIP gateway and gatekeeper, which enabled this system to analyze the performance of devices and the quality of voice traffic transmission between PSTN and Internet. By presenting the implementation methods and application of this system, we managed to propose the utilization scheme of a simulation tool.

• Journal of Digital Convergence
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• v.9 no.5
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• pp.225-233
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• 2011

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 a recording system which records voice data of SIP-based Internet telephone's voice calls. It is developed on the linux system and has some features such as audio mixing of two in/out voice channels, live packet sniffing, and the ability to transfer mixed audio files to the log file server. These functions are implemented using various open source softwares. Afterwards, this VoIP recording system will be applied as a base technology to advanced services like a VoIP-based call center system.