• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 추계학술대회 논문집 전력기술부문
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• pp.382-384
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• 2008

D-TRS is a method of wireless communication. This method will be able to use several frequency for multiple user used chanel together. TETRA of D-TRS technology is not rented network. Using TETRA network has the strong point which cost better than CDMA network of rental network. Master server of SCADA(Supervisory Control And Data Acquisition) system is realtime supervise control and a data acquire the control system or the RTU(Remote Terminal Unit). The present paper is developed and proposal the gateway platform for electronic power backbone network based on D-TRS. This gateway platform is converted DNP3.0 messages with TETRA PDU and converted TETRA PDU with DNP3.0 messages. Master server and FRTU will be able to send and receive DNP3.0 message via TETRA network using this gateway platform.

• 한국게임학회 논문지
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• 제9권1호
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• pp.75-84
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• 2009

본 논문은 오랜 기간 다양한 분야에서 개발되어 온 공개 네트워크 라이브러리인 ACE를 사용하여 게임 서버에 접목 시켜 보았다. ACE 네트워크 라이브러리는 고성능 실시간 통신 라이 브러리와 어플리케이션 개발에 집중되어 있고 방대한 기능을 제공하고 있다. 본 연구에서는 ACE의 여러 기능 중에 게임 개발에 필요한 부분을 논리적으로 재구성하여 최적화 하였고, 재구성한 라이브러리의 검증을 위해 실제 배틀넷 서버를 구현하였다. 실험방법으로는 배틀넷 서버와 테스트 클라이언트를 설정하여 접속 요청 테스트와 데이터 전송 테스트를 수행하였다. 실험 결과로서 검증된 네트워크 라이브러리인 ACE를 사용하여 온라인 게임 개발이 가능하다는 결과를 얻었다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 컴퓨터소사이어티 추계학술대회논문집
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• pp.231-234
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• 2003

This paper designs and implements fault-tolerant server of meta server for shared filesystem (SANfs) in SAN environment. SANfs is the filesystem that many clients can share data in Network-attached storage in SAN environment and meta server is the server that processes file operation in SANfs. The focus of this paper is the implementation of fault-tolerant server of meta server in SANfs. In the event of a meta server, meta server failovers to a fault-tolerant server where its processing continues seamlessly. If meta server doesn't restore, fault-tolerant server searches reliable client and makes another fault-tolerant server and work as meta server. Heartbeat monitors meta server and shadow server and controls them.

• 한국전자통신학회논문지
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• 제16권5호
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• pp.817-824
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• 2021

기존 네트워크 체계의 한계점을 극복하기 위해 등장한 SDN(Software Defined Networking) 기술은 네트워크 장비에서의 HW와 SW의 분리를 통해 기존 체계의 경직성을 해소한다. 이러한 SDN의 특성은 하드웨어 중심의 네트워크 장비를 벗어나 폭넓은 확장성을 제공하며, 다양한 규모의 데이터센터에서의 유연한 부하분산정책을 제공해준다. 그동안 이러한 SDN의 장점을 데이터센터에 적용한 연구들이 다수 진행되어왔으며 효과를 보여줬다. 기존 연구들에서 주되게 사용된 방식은 서버의 부하를 주기적으로 확인하여 이를 기반으로 부하분산을 수행하는 방식이었다. 이 방식에서는 서버의 수가 많고 서버 로드 확인 주기가 짧을수록 트래픽이 증가한다. 본 논문에서는 이러한 제한사항을 해소하기 위해 서버에서 특정 수준의 부하 발생 시 이를 컨트롤러로 보고하는 방식을 통해 불필요한 트래픽을 없애고 서버들의 자원을 보다 효율적으로 관리할 수 있는 새로운 부하분산 기법을 제안한다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 하계종합학술대회 논문집(3)
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• pp.125-128
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• 2001

Nowadays, Internet users are widespread internationally. Fallowing the users requirements, server has to transfer real-time multimedia data to many clients. Multicast can significantly reduce the system overhead and the network resource waste, so it supports efficient mechanism when server has to transfer same data to many clients. We can deliver multimedia data transfer in real-time using Patching Algorithm which has no delay for service request. And multicast algorithm can support different network bandwidth using Receiver driven Layered Multicast under heterogeneous environment network. The purpose of this paper is to suggest an algorithm that can create new multicast group adequately and transfer real-time multimedia data efficiently under heterogeneous environment.

• Journal of information and communication convergence engineering
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• 제20권1호
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• pp.16-21
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• 2022

In this research, we create a network infrastructure based on a service-oriented infrastructure (SOI) for the virtualization technology and integrate it with a cloud technology that applies the cloud integration management platform (CIMP) concept. In CIMP, the server and storage will be separated. The server will be adopted for virtualization while the storage will be used by students and teachers to store data. As long they save their data in the storage module, every time, everywhere, and on every device, they can access their data. This research will implement the design of the network infrastructure and be applied to the remote practical learning system in the laboratory. Students and teachers will ultimately adopt this network infrastructure for remote practice using their respective devices without physically meeting in the laboratory. In the future, if the implementation phase is successful, then in addition to laboratory environments, it can be implemented in all learning activities at our campus.

• Journal of information and communication convergence engineering
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• 제3권2호
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• pp.90-92
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• 2005

As the result of the study shows, Round Robin Algorithm allows servers to ensure definite traffic distribution, unless incoming data loads differ much. Although error levels are high in some cases, they were eventually alleviated by repeated tests for a long period of time. The study uses two software packages (Packet Capture and Round Robin Test Package) to check packet volume from Virtual Network Structure (data generator, virtual server, Server 1, 2, 3), and finds out traffic distribution toward Server 1, 2, and 3. The functions of implemented Round Robin Load Balancing Monitoring System include round robin testing, system monitoring, and graphical indication of data transmission and packet volume.

• 한국멀티미디어학회논문지
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• 제25권6호
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• pp.793-806
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• 2022

As the IMO introduced MASS (Maritime Autonomous Surface Ships), ISO(International Organization for Standardization) announced ISO 19847 of a maritime data sharing standard for collecting and remotely managing data of ship systems. Previous literature evaluated the risk using HAZOP for ISO 19847 and proved that risk assessment is useful through experiments. However, redundancy of ISO 19847 ship data server which is one of the risk reduction method suggested in previous literature, was designed but couldn't tested due to the limitations of the conditions. So, in this study, to prove the usefulness of the ship data server redundancy of ISO 19847 which was not tested in previous literature. It based on the design of previous literature, and the network of ship data servers was modeled using the SES/DEVS format and simulated using the DEVS# open source library.

• 정보처리학회논문지C
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• 제9C권5호
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• pp.615-626
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• 2002

최근 흠 네트워킹에 대한 관심이 증가하면서 멀티미디어 클립서비스에 관한 연구가 진행되고 있다. 가정내 네트워크의 대역폭이 가지는 한계로 인해 클라이언트-서버 방식을 통한 대용량 멀티미디어 자료들을 장시간 동안 받아야하고 서버에 트래픽이 증가하는 문제점들이 나타나고 있다. 본 논문에서는 서버를 거치지 않고 가정과 가정을 직접 연결하여 자료를 교환할 수 있는 Peer-to-Peer(P2P) 기술이 적용된 자료공유 네트워크 시스템을 설계하였고 서버의 트래픽을 줄이도록 하였으며 Java 언어로 플랫폼 독립적인 시스템을 구현하였다.

• International Journal of Computer Science & Network Security
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• 제24권4호
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• pp.60-66
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• 2024

Host's data during transmission. Data tempering results in loss of host's sensitive information, which includes number of VM, storage availability, and other information. In the distributed cloud environment, each server (computing server (CS)) configured with Local Resource Monitors (LRMs) which runs independently and performs Virtual Machine (VM) migrations to nearby servers. Approaches like predictive VM migration [21] [22] by each server considering nearby server's CPU usage, roatative decision making capacity [21] among the servers in distributed cloud environment has been proposed. This approaches usage underlying server's computing power for predicting own server's future resource utilization and nearby server's resource usage computation. It results in running VM and its running application to remain in waiting state for computing power. In order to reduce this, a decentralized decision making hybrid model for VM migration need to be proposed where servers in decentralized cloud receives, future resource usage by analytical computing system and takes decision for migrating VM to its neighbor servers. Host's in the decentralized cloud shares, their detail with peer servers after fixed interval, this results in chance to tempering messages that would be exchanged in between HC and CH. At the same time, it reduces chance of over utilization of peer servers, caused due to compromised host. This paper discusses, an roatative decisive (RD) approach for VM migration among peer computing servers (CS) in decentralized cloud environment, preserving confidentiality and integrity of the host's data. Experimental result shows that, the proposed predictive VM migration approach reduces extra VM migration caused due over utilization of identified servers and reduces number of active servers in greater extent, and ensures confidentiality and integrity of peer host's data.