• The KIPS Transactions:PartC
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• v.15C no.2
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• pp.87-92
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• 2008

This paper proposes a session control model for the P2P(Peer to Peer) IPTV(Internet Protocol Television) services and presents the IPTV session control procedures based on the proposed model. Since, while public IPTV traffic is usually processed via a separate network, P2P IPTV traffic is processed together with the conventional Internet access traffic, the P2P IPTV control mechanism needs to provide multi-stream processing for the constituent TPS(Triple Play Service) traffic and corresponding QoS(Quality of Service) control functions. Besides, P2P IPTV session control mechanism should provide appropriate multicast control functions in order to support effective transmission of video traffic generated by personal IPTV broadcasters. The P2P IPTV session control model proposed in this paper is designed to be based on the standard SIP(Session Initiation Protocol), IGMP(Internet Group Management Protocol), and COPS(Common Open Policy Service) protocol so that it can contribute to the easy and prompt deployment of inter-operable P2P IPTV platform.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.4
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• pp.91-99
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• 2014

The main game architectures for multiplayer online games are the traditional client-server architectures, multi-server architectures and P2P(peer-to-peer) architectures. P2P architectures, due to their distributed and collaborative nature, have low infrastructure costs and can achieve high scalability as well as fast response time by creating direct connections between players. However, P2P architectures face many challenges. Distributing a game among peers makes maintaining control over the game more complex. These architectures also tend to be vulnerable to churn and cheating. Providing consistency control in P2P systems is also more difficult since conflicting updates might be executed at different sites resulting in inconsistency. In order to avoid or correct inconsistencies, most multiplayer games use a primary-copy replication approach where any update to the object has to be first performed on the primary copy. This paper presents the primary-copy model with the update dissemination mechanism that provides consistency control over an object in P2P architectures for multiplayer online games. The performance for this model is evaluated through simulation experiments and analysis.

• 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.

• IEMEK Journal of Embedded Systems and Applications
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• v.2 no.1
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• pp.60-65
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• 2007

본 논문은 P2P 기반의 가상홈 미들웨어를 탑재할 수 없는 장치(이하 레가시 디바이스)를 P2P 인프라에 참여시키기 위한 방법에 관한 것으로, P2P 인프라와 레가시 디바이스 사이에 중계역할을 담당하는 레가시 프락시에 대한 연구이다. 가상홈 플랫폼은 기기 간 Seamless 연결을 제공하는 가상공간을 구성하여 언제 어디서나 P2P 방식으로 기기 간 서비스 및 콘텐츠를 용이하게 검색하고 공유하기 위한 기술로 JXTA 스펙을 따르고 있다. 레가시 프락시는 가상홈 미들웨어에 레가시 컨텐츠 공유 서비스, 가상홈 연계 서비스 및 레가시 디바이스 원격 제어 서비스를 추가한 것으로, 가상홈 인프라에 있는 임의의 피어가 레가시 디바이스의 컨텐츠 및 서비스를 이용하고 원격제어 할 수 있도록 해 준다.

• Proceedings of the KIEE Conference
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• 2008.10b
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• pp.347-348
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• 2008

본 논문에서는 P3-DX 모바일 로봇과 영상처리 시스템을 이용하여 비주얼 서보잉 시스템을 개발하였다. P2Arm 다이나믹을 이용해서 비주얼 서보잉을 위한 로봇 팔 제어를 연구하였고, 로봇을 제어하는 데 있어 보다 효율성과 정확성을 높이기 위해 Kalman 필터 알고리즘을 제안하였다. 비주얼 서보잉에 필수적인 영상정보를 얻기 위해 5자유도 P2Arm에 CCD카메라를 부착하였으며 그 영상정보를 바탕으로 P2Arm을 비롯하여 전체 로봇의 구동을 제어하는 시스템을 개발하였다. 본 논문에서는 P3-DX의 전체적인 구조와 P2Arm의 기구학적인 해석을 논하였고 물체 인식을 위한 영상처리 과정 및 제어알고리즘을 기술하였다. 또한 몇 가지 실험을 통해 본 시스템의 효율성을 검증하였다.

• Journal of The Institute of Information and Telecommunication Facilities Engineering
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• v.1 no.2
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• pp.30-42
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• 2002

UPnP(Universal Plug and Play) is commercial product for the first time in home network middlewares, but it has problem that it has no security standards in UPnP specification. In this paper, we present UPnP security model. It is based on XML Signature of XML Security. It provides UPnP with secure services which are device control message authentication and user access level control. It is independent of UPnP modules and has mobility of secure service modules for non secure ability user part. We conclude this paper with an example of applying UPnP Security model to the UPnP audio device control and an test example.

• Proceedings of the KIPE Conference
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• 2012.11a
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• pp.185-186
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• 2012

본 논문에서는 HVDC C&P(High Voltage Direct Current Control and Protection) 시스템의 네트워크 이중화 방법을 제안한다. 본 논문에서 제안하는 HVDC C&P 시스템 네트워크 이중화 방법은 2개의 이더넷 라인을 제어기에 직접 연결하고, 연결된 라인으로 동시에 정보를 송신하여, 제어기에서 정보를 필터링하여 사용하는 방법을 사용한다. 또한 네트워크 라인의 효과적인 결선 체크를 위해 제어기간 송수신을 통해 네트워크 라인의 결선을 체크하는 방법을 사용한다. 위와 같은 방법은 HVDC C&P 시스템의 네트워크 안정성을 향상시키는 효과를 기대할 수 있다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.06a
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• pp.695-698
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• 2007

The control of electrical appliances residing in the home network can be accomplished via Internet with the UPnP expansion without modifying an existing UPnP. In this paper, we propose the Internet Gateway that consists of an UPnP IGD(Internet Gateway Device) DCP(Device Control Protocol) and an UPnP Bridge as a system to control electrical appliances of home network. UPnP IGD DCP is to enable the configurable initiation and sharing of Internet connections as well as assuring advanced connection-management features and management of host configuration service. It also supports transparent Internet access by non-UPnP-certified devices. UPnP Bridge searches for local home network devices by sending control messages, while control point of UPnP Bridge looks up devices of interest on the Internet, subsequently furnishing the inter-networking controlling among devices which belong to different home network systems. With our approach, devices on one home network can control home electrical appliances on the other hone network via Internet through IGD DCP with control commands of UPnP.

• Journal of Animal Science and Technology
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• v.46 no.2
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• pp.251-260
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• 2004

The feasibility and stability of ORP, pH(mV) and DO as a real-time control parameter for SBR process were evaluated in this study. During operation, NBP(nitrogen break point) and NKP(nitrate knee point), which reveal the biological and chemical changes of pollutants, were clearly observed on ORP and pH(mV)-time profiles, and those control points were easily detected by tracking the moving slope changes(MSC). However, when balance of aeration rate to loading rate, or to OUR(oxygen uptake rate), was not optimally maintained, either false NBP was occurred on ORP and DO curves before the appearance of real NBP or specific NBP feature was disappeared on ORP curve. Under that condition, however, very distinct NBP was found on pH(mV)-time profile, and stable detection of that point was feasible by tracking MSC. These results might mean that pH(mV) is superior real-time control parameter for aerobic process than ORP and DO. Meanwhile, as a real-time control parameter for anoxic process, ORP was very stable and more useful parameter than others. Based on these results, a stable real-time control of process can be achieved by using the ORP and pH(mv) parameters in combination rather than using separately. A complete removal of pollutants could be always ensured with this real-time control technology, despite the variations of wastewater and operation condition, as well as an optimization of treatment time and capacity could be feasible.

• Review of Korean Society for Internet Information
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• v.8 no.1
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• pp.36-40
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• 2007