• 한국멀티미디어학회논문지
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• 제17권4호
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• pp.526-534
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• 2014

Most of the multiplayer games available online are based on a client-server architecture because this architecture gives better administration control to the game providers than peer-to-peer architecture. In this architecture, the server is responsible for all the communication between the connected clients. The weakness of this architecture is its bandwidth requirement and scalability. Peer-to-peer architectures have then been proposed to solve these issues. In this paper, we propose a hybrid client-server architecture in which the game state is partially shared by the mobile terminal to achieve consistency among different players. Like a peer-to-peer architecture, this architecture uses client-side capacities to reduce bandwidth requirements for the server and improves consistency in wireless networks. Client events have different timeliness and consistency requirements according to their nature in the game world. These requirements lead to tasks with different priorities on CPU processing. In the proposed architecture, either the server or the client applies consistency mechanism according to the priority level. Simulation experiments show that the bandwidth of the server in this architecture is smaller than that of the client-server architecture. As a result, the server in the proposed architecture can accommodate more clients with enhancing the scalability.

• 한국컴퓨터산업학회논문지
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• 제7권3호
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• pp.237-244
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• 2006

본 논문에서는 사용자 수 증가로 인한 확장 가능한 온라인 게임 서버 구조를 제시하고 있다. 현재 상용 서비스 중인 대부분의 온라인 게임 서버에서는 로긴서버, 캐시서버, 데이터베이스서버, 게임서버, NPC서버 등으로 구성된 하나의 서버 그룹을 운영하다가 사용자 수 증가에 따라 같은 구조의 또 다른 서버 그룹을 추가 설치하고 있다. 그러나 본 논문에서 제안하는 서버 구조는 서버를 추가 설치할 때 로긴서버, 캐시서버, 데이터베이스서버, 게임서버, NPC서버 등의 한 그룹을 추가시키지 않고 게임서버만을 추가한다. 이후 캐시서버나 데이터베이스서버에 부하가 걸릴 때에만 또 다른 서버 그룹을 추가시켜 서버 추가 비용을 최대한 줄일 수 있게 하였다.

• 한국게임학회 논문지
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• 제2권2호
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• pp.20-27
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• 2002

본 논문에서는 사용자 수 증가에 의한 네트워크 게임 서버 부하를 줄일 수 있는 효율적인 서버 구조를 제시하였으며, 이를 위해 대칭형 분산 서버 구조와 비대칭 형 분산 서버 구조를 적절히 혼용하는 방식을 채택하였다. 대칭형 분산 서버 구조 방식은 서버들간의 부하 분배를 효율적으로 운영할 수 있다는 장점이 있고 비대칭형 분산 서버 구조는 한 서버 그룹 내에서 서로 다른 게임 서버로 자유롭게 이동할 수 있다는 장점이 있다. 본 제안 서버 구조에서는 이러한 장점들을 적절히 이용하여 온라인 게임 서버의 효율성을 향상시켰다.

• 정보처리학회논문지B
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• 제12B권4호
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• pp.459-464
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• 2005

온라인 게임 시스템은 크게 서버와 클라이언트 두 부분으로 나누어 볼 수 있다. 클라이언트는 게임 서버와의 접속 그리고 서버로부터 전송되는 패킷 분석 등의 역할을 하며, 게임 서버는 사용자 정보와 데이터베이스 둥의 관리를 수행한다. 특히 게임 서버는 새로운 클라이언트가 게임을 수행하기 위해 서버로의 접속을 허용할 경우 기존에 연결된 사용자와의 온라인 연결을 유지하면서 새로운 클라이언트의 접속 요청을 받아들여 야 한다. 본 논문에서는 서버의 다중 작업 처리를 위한 방법 중 프로세스(Process) 방법과 쓰레드(Thread) 방법의 처리 형태를 비교한 후, 현재 대부분의 게임 서버에 적용되어 있는 비대칭 분산형 구조에 적합한 비대칭 분산형 다중 서버 구조를 제안하였다. 제안한 비대칭 분산형 다중 서버 구조는 서버의 기능을 로그인 서버, 게임 서버, 통신 서버, 데이터베이스 서버 형태로 세부적으로 분리하여 각각의 기능을 독립적으로 수행한다. 따라서 다른 구조들과 비교하였을 경우 경제적, 기능적으로 더 나은 성능을 보이며 특히 서버의 안정성과 확장성이 향상되었다.

• 한국인터넷방송통신학회논문지
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• 제18권4호
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• pp.123-130
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• 2018

많은 대규모 멀티플레이어 온라인 게임(MMOG)들은 서버 측의 막대한 대역폭 요건이 필요한 클라이언트-서버 구조를 사용한다. 본 논문에서 클라이언트-서버 구조와 peer-to-peer 구조의 장점을 결합하며 게임 상태를 변경시키는 중요한 이벤트들만 서버에서 처리하는 영역 기반의 하이브리드 게임 구조를 제시한다. 이 하이브리드 구조에서 중앙 서버는 게임을 영역들로 분할하며 중요 갱신 작업을 각 영역 내에서 분산시키는 플레이어를 영역 서버로 설정한다. 즉 중앙 서버는 영역 서버를 통하여 플레이어들에게 상태 갱신 작업을 전송한다. 동일 영역에 있는 모든 플레이어들은 게임 상태에 영향을 주지 않는 갱신 작업만 직접 상호 교환한다. 분담된 작업은 중앙 서버의 대역폭을 매우 감소시키며 중앙 서버가 더 많은 플레이어들을 동시에 실행시킬 수 있도록 한다. 실험 결과 3 단계 계층의 영역 기반 하이브리드 구조는 클라이언트-서버 구조보다 규모조정 능력이 우수하며 영역 서버로 작용하는 플레이어들의 충분한 대역폭을 요구하는 반면 중앙 서버의 상당한 대역폭을 감소시킬 수 있는 것으로 나타났다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권2호
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• pp.811-829
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• 2015

One-way authenticated key agreement protocols, aiming at solving the problems to establish secure communications over public insecure networks, can achieve one-way authentication of communicating entities for giving a specific user strong anonymity and confidentiality of transmitted data. Public Key Infrastructure can design one-way authenticated key agreement protocols, but it will consume a large amount of computation. Because one-way authenticated key agreement protocols mainly concern on authentication and key agreement, we adopt multi-server architecture to realize these goals. About multi-server architecture, which allow the user to register at the registration center (RC) once and can access all the permitted services provided by the eligible servers. The combination of above-mentioned ideas can lead to a high-practical scheme in the universal client/server architecture. Based on these motivations, the paper firstly proposed a new one-way authenticated key agreement scheme based on multi-server architecture. Compared with the related literatures recently, our proposed scheme can not only own high efficiency and unique functionality, but is also robust to various attacks and achieves perfect forward secrecy. Finally, we give the security proof and the efficiency analysis of our proposed scheme.

• 한국국방경영분석학회지
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• 제23권2호
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• pp.25-44
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• 1997

Internet users been rapidly increased due to the convenient GUI environment. Current Web-based HTTP/CGI client/server architecture has several problems such as the CGI bottleneck, no maintaince of state, and no load balancing. However, with Java and CORBA technologies called“Object Web technology”, we can solve them because Java is not only a mobile code but also a platform-independent code, and CORBA has ability to build distributed object and language-independent object model. The goal of “Object Web technology”is to create multivendor, multiOS, multilanguage“legoware”using objects. This paper implement“Book Search System”which is Web-based client/server architecture using distributed objects. Environments of this implementation are Hangul Windows NT(included IIS) server, Hangul Windows 95 client, Visigenic's VisiBroker for Java 1.2 which is a product of CORBA 2.0, HTTP protocol on TCP-IP-based, Sybase SQL Anywhere 5.0 database server, and the interface between application server and database is JDBC-ODBC bridge middleware.

• Journal of information and communication convergence engineering
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• 제18권2호
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• pp.82-87
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• 2020

This paper discusses how to design a game server that is scalable, adaptable, and re-buildable with components. Furthermore, it explains how various implementation issues were resolved. To support adaptability, the server comprises three layers: network, user, and database. To ensure independence between the layers, each layer was designed to communicate with each other only via message queues. In this architecture, each layer can have an arbitrary number of threads; thus, scalability is guaranteed for each layer. The network layer uses input/output completion ports(IOCP), which shows the best performance on the Windows platform, it can handle up to 5,000 simultaneous connections on a typical entry-level computer, despite being built with a single-threaded user layer. To completely separate the database from the game server, the SQL code was not directly embedded in the database layer.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2001년도 봄 학술발표논문집 Vol.28 No.1 (A)
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• pp.187-189
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• 2001

In this study, the Web Camera System is implementation and simulated on two different architectures. In the one architecture, a Web-server and Camera-server are implemented on the same system, and the system transfers motion picture which compressed to JPEG file to users on the WWW(World Wide Web). In the other architecture, the Web-server and Camera-server are implemented on different systems, and the motion picture is transferred from the Camera-server to Web-server, and finally to users. In order to compare system performance between two architecture, data traffic is measured and simulated in the unit of byte per second and frame per second.

• 한국데이타베이스학회:학술대회논문집
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• 한국데이타베이스학회 1994년도 DB산업기술 활성화를 위한 학술대회 및 기술 심포지움
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• pp.105-129
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• 1994

The information system of corporations are facing a new environment expressed by miniaturization, decentralization and Open System. It is therefore of utmost importance for corporations to adapt flexibly th such new environment by providing for corresponding changes to their existing information systems. The objectives of this study are to identify this new environment faced by today′s information system and develop effective methods for data resource management under this new environment. In this study, it is assumed that the new environment faced by information systems can be specified as Distributed Computing Environment, and in order to achieve such system, presents Client/server architecture as its representative computing structure, This study defines Client/server architecture as a computing architecture which specialize the fuctionality of the client system and the server system in order to have an application distribute and perform cooperative processing at the best platform. Furthermore, from among the five structures utilized in Client/server architecture for distribution and cooperative processing of application between server and client this study presents two different data management methods under the Client/server environment; one is "Remote Data Management Method" which uses file server or database server and. the other is "Distributed Data Management Method" using distributed database management system. The result of this study leads to the conclusion that in the client/server environment although distributed application is assumed, the data could become centralized (in the case of file server or database server) or decentralized (in the case of distributed database system) and the data management method through a distributed database system where complete responsibility and powers with respect to control of data used by the user are given not only is it more adaptable to modern flexible corporate environment, but in terms of system operation, it presents a more efficient data management alternative compared to existing data management methods in terms of cutting costs.