• 한국정보통신학회논문지
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• 제24권11호
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• pp.1546-1549
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• 2020

This paper introduces the development process of mobile home CCTV that enables remote control and object recognition using unused smartphones and Arduino. Clients can control motors connected to Arduino through button, enable bidirectional voice communication between client-server and receive video from the server in real time. The server sends a PUSH notification to the client when its battery is low. When the server recognizes the charger, the client's remote control allows the server to dock to the charger and charge it. It was confirmed that video and voice delivery between client and server works well without any problems, and that object recognition works smoothly.

• 한국컴퓨터정보학회논문지
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• 제23권9호
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• pp.73-80
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• 2018

In this paper, we propose a new type of client server environment to improve the architecture vulnerable to hacking in an existing client server environment. On the server side, move the existing Web server to the client side and This is a way for clients to communicate only the data they need and suggests a structure that completely blocks the web attack itself to the server. This can completely prevent a server from being hacked, spreading malicious code and hacking data on a server. It also presents a new paradigm that will not affect servers even if malware is infected with client PCs. This paper validates the proposed environment through BBS (Big Bad Stick) hardware in the form of USB on the client side. This study proof that secure services are provided through encryption communication with server-side security equipment, indicating that this study is a system with new security.

• 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.

• 제어로봇시스템학회논문지
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• 제10권9호
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• pp.847-854
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• 2004

In this paper, It is studied to control and to monitor the remote system state using HTTP(Hyper Text Transfer Protocol) object communication. The remote control system is controlled by using a web browser or a application program. This system is organized by three different part depending on functionality-server part, client part, controller part. The java technology is used to composite the server part and the client part and C language is used for a controller. The server part is waiting for the request of client part and then the request is reached, the server part saves client data to the database and send a command set to the client part. The administrator can control the remote system just using a web browser. Remote part is worked by timer that is activated per 1 second. It gets the measurement data of the controller part, and then send the request to the server part and get a command set in the command repository of server part using the client ID. After interpreting the command set, the client part transfers the command set to the controller part. Controller part can be activated by the client part. If send command is transmitted by the client part, it sends sensor monitoring data to the client part and command set is transmitted then setting up the value of the controlled system.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2005년도 전력전자학술대회 논문집
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• pp.621-623
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• 2005

OPC has made it to improve the development of control and monitoring software. But it is difficult to understand COM/DCOM model that is a base technology of OPC and complex communication setting between OPC Server and OPC Client. Therefore, in this paper, we design and implement ActiveX based components that are enable to solve these problems. Implemented components provide a method for simple communication between OPC Server and OPC Client and a GUI environment for easy and fast setting of communication information. Also, they provide the architecture for efficient management of OPC Server's data. By using implemented component, easy development and efficient maintenance of OPC Client can be supported.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1993년도 추계학술대회
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• pp.71-73
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• 1993

We are developed out-patient order communication system using server/client architecture. We used Microsoft SQL server for relational database and Visual basic language for client. The configuration of system hardware is 486 DX servers and 200 node 486/SX PC and 10 base T network.

• Journal of Information Display
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• 제5권4호
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• pp.38-44
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• 2004

In this paper, a server and client simulator for the web-based multi-view 3D image communication system is implemented by using the IEEE 1394 digital cameras, Intel Xeon server computer and Microsoft's DirectShow programming library. In the proposed system, two-view image is initially captured by using the IEEE 1394 stereo camera and then, this data is compressed through extraction of its disparity information in the Intel Xeon server computer and transmitted to the client system, in which multi-view images are generated through the intermediate views reconstruction method and finally display on the 3D display monitor. Through some experiments it is found that the proposed system can display 8-view image having a grey level of 8 bits with a frame rate of 15 fps.

• 한국정보통신학회논문지
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• 제15권3호
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• pp.660-672
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• 2011

정보를 공유하기 위하여 널리 이용되는 웹은 클라이언트-서버 모델을 사용한다. 클라이언트-서버 모델은 클라이언트의 명시적인 요청을 통하여 서버가 응답하는 방식으로서 오늘날의 급변하는 인터넷 정보를 효과적으로 제공하기에는 많은 어려움이 따른다. 서버 푸시는 클라이언트-서버 모델 기반의 웹에서 클라이언트의 요청이 없더라도 서버가 능동적으로 정보를 제공할 수 있는 통신 기술이다. 이러한 서버 푸시 기술을 구현하기 위하여 다양한 연구가 이루어지고 있지만 푸시 어플리케이션의 효과적인 개발을 지원하는 푸시 엔진의 부재로 많은 어려움이 따르고 있다. 본 논문에서는 인터넷에서 서버 푸시 서비스를 효과적으로 제공하도록 지원하는 Java Push Engine인 JPE의 개발에 대하여 기술한다. JPE는 Epoll을 지원하는 JPE 코어와 비동기 통신을 지원하는 JPE 라이브러리로 구성된다. 그리고 JPE는 다양한 푸시 기능을 정의하고 이를 지원하는 프로그래밍 인터페이스를 제공한다. JPE를 이용하여 개발된 푸시 어플리케이션은 Epoll 기법을 이용하여 클라이언트 연결을 효과적으로 처리하며, Ajax 기반의 비동기 통신을 통하여 다양한 푸시 서비스를 제공한다.

• 제어로봇시스템학회논문지
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• 제11권11호
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• pp.970-976
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• 2005

OPC has made it to improve the development of control and monitoring software. But it is difficult to understand COM/DCOM model that is a base technology of OPC and complex communication setting between OPC Server and OPC Client. Therefore, in this paper, we design and implement ActiveX based components that are enable to solve these problems. Implemented components provide a method for simple communication between OPC Sewer and OPC Client and a GUI environment for easy and fast setting of communication information. Also, they provide the architecture fur efficient management of OPC Server's data. By using implemented component, easy development and efficient maintenance of OPC Client can be supported.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 ITC-CSCC -1
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• pp.257-259
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• 2000

In this paper, a word-unit recognition is performed to implement a speech recognition system over the web, using JAVA Applet and continuous distributed HMM. The system based on Client/server model is designed. A client computer processes speech with Applet, and then transmits feature parameters to the server computer though the Internet. The speech recognition system in the server computer transmits the result applied by the forward algorithm to the client computer and the result is displayed in the client computer by text.