• 한국정보처리학회논문지
• /
• 제6권3호
• /
• pp.641-653
• /
• 1999

The paper is design and implementation of the system to support security communication between a Web Browser and a CGI program by a Web Server using PKI(Public Key Infrastructure. This system uses GSS(Generic Security Service)-API to communicate with PKI, offers a Web user a Client Proxy, and offers a CGI developer there library functions related with security. TLS(Transport Layer Security) supports security communication between a Web Browser and a Web Server, but the system supports security communication between a Web Browser and a CGI program as the protected data received from a Client Proxy are sent to a CGI program, and the CGI program decrypts the data using the library functions supported by this system.

• Journal of Mechanical Science and Technology
• /
• 제16권12호
• /
• pp.1604-1612
• /
• 2002

Rollers in the continuous process systems are ones of key components that determine the quality of web products. The condition of rollers (e.g. eccentricity, runout) should be consistently monitored in order to maintain the process conditions (e.g. tension, edge position) within a required specification. In this paper, a new diagnosis algorithm is suggested to detect the defective rollers based on the frequency analysis of web tension signals. The kernel of this technique is to use the characteristic features (RMS, Peak value, Power spectral density) of tension signals which allow the identification of the faulty rollers and the diagnosis of the degree of fault in the rollers. The characteristic features could be used to train an artificial neural network which could classify roller conditions into three groups (normal, warning, and faulty conditions) The simulation and experimental results showed that the suggested diagnosis algorithm can be successfully used to identify the defective rollers as well as to diagnose the degree of the defect of those rollers.

• 제어로봇시스템학회논문지
• /
• 제6권9호
• /
• pp.813-821
• /
• 2000

In this paper, we developed modeling of tension and speed dynamics for a two-drum winder in a three span continuous web transport system which had not been previously. Dynamic modeling of the time-varying nonlinear system was derived by considering the effect of the radii and mass moment of inertia in the unwinder and the two-drum winder through winding up the web. After linearizing it, we designed with a variable-gain a PID controller for tension control and a PI controller for speed. Simulation is carried out with the variation of radii and moment of inertia at high speed for the proposed tension control system with the two-drum winder and the variavle-gain a PID controller. Results show good performance of tension control during the speed change speed at a start-up and stop.

• 한국전자통신학회논문지
• /
• 제13권3호
• /
• pp.517-524
• /
• 2018

본 논문은 웹 브라우저를 통해 시간과 장소에 구애받지 않는 실시간 사물 제어 방안의 핵심 요소 4가지를 제시한다. 그리고 서로 다른 프로토콜(Protocol)과의 통신이 가능하게 함은 물론 각 프로토콜의 장점을 살릴 수 있는 시스템을 설계 구현하기 위해 최근 국제표준화가 완료된 HTML5의 웹 소켓(Web Socket)기술과 IoT 환경에서 최적의 프로토콜로 주목받고 있는 MQTT(Message Queue Telemetry Transport) 프로토콜을 사용해 저전력, 제한된 통신환경에서 메시지 통신 환경을 구현한다. 그리고 직관적이고 간단한 하드웨어를 설계해보고 사용자의 접속 장치에 구애받지 않는 반응형 웹(Response Web) 인터페이스를 구현해 하드웨어로부터 실시간 데이터를 전달받고 역으로 사용자가 사물을 제어할 수 있는 양방향 시스템을 설계 구현한다.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2003년도 하계종합학술대회 논문집 Ⅲ
• /
• pp.1653-1656
• /
• 2003

In this paper, we implemented a web-based communication system using Motion JPEG and RTP. MJPEG compression method is used for compression of the image in order to film and transmit the moving image information in the real time, and the RTP(Real-Time Transport Protocol) which differs from the existing TCP and UDP is used for the data transmission.

• 정보처리학회논문지C
• /
• 제14C권5호
• /
• pp.453-462
• /
• 2007

NGN은 QoS가 지원되는 광 대역 전달 망에서 세션 및 비-세션 서비스를 지원하기 위한 패킷 기반의 융합 망이다. NGN의 RACF(Resource and Admission Control Functions)는 전송망의 토폴로지 및 자일 상태 정보곤 수집하기 위하여 COPS와 SNMP를 자원 관리 프로토콜로 고려하고 있다. 본 논문에서는 NGN 전송 층의 토폴로지 및 자원 상태 관리를 위한 요구 사항을 정의하며 자원 제어 프로토콜에서 정의되는 데이터 모델들의 일관성을 유지하기 위해 프로토콜 중립적인 정보 모델을 제안한다. 또한, UML로 기술된 정보 모델을 이용하여 웹 서비스 기반의 NGN 자원 관리 시스템을 선계 및 구현하였다.

• 산업기술연구
• /
• 제20권A호
• /
• pp.63-71
• /
• 2000

A web based watershed and sewer management system was developed for the analysis of stormwater runoff and sewer flow, and for optimal operation of sewer works using ArcView and SWMM. SWMM and ArcView were dynamically linked together using Avenue and Visual Basic in order to construct user-friendly management system. The developed system was applied to Choonchun city to verify its utilities. All the relevant field data were analyzed on the basis of developed system, and the modeling of runoff and sewer flow was implemented using RUNOFF and TRANSPORT blocks in SWMM. This system was connected to the management system of surface and subsurface environment management system in order to develop an integrated environmental management system. Futhermore, this system will be a critical part of overall control system of sewer works including sewer line and wastewater treatment plant. As this system can provide comprehensive prediction of flow and pollution profiles and analytical tool equipped with Web-GIS, it could serve widely as a tool not only for optimal management, but also for decision support system to examine the efficiency of planning and implementation of sewer projects.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 A
• /
• pp.147-150
• /
• 2003

In this paper, we describe a remote surveillance system to monitor the states of remote processes through Internet on Web browser The images captured from multiple remote cameras are transferred to data server exploiting RTP (Real-time Transport Protocol) and displayed up to 4 channels simultaneously. The angle of cameras is moved vertically an horizontally through RS-232C communication line by motor control board e벼ipped with AT90S2313 CPU.

• 한국도로학회논문집
• /
• 제14권6호
• /
• pp.57-65
• /
• 2012

PURPOSES : Efficiency Improvement of a public road construction project management work using the development of a real-time remote site monitoring system METHODS : In this study, we developed the remote site monitoring system using a web camera for road construction projects in the RCMA(Regional Construction Management Administration). We can be monitored a construction progress and a weak point of the situation in real time using this. To achieve this, we tested about 10 road construction projects ordered by RCMA. Then, we verified a applicability for the site monitoring system in future. RESULTS : Take advantage of the remote site monitoring system consists of the Construction CALS System, one of the business systems used in the part of the MLTM(Ministry of Land, Transport and Maritime Affairs) institution-agencies. Was configured to be served through the "Construction CALS System" of "Construction Management System(Contractors)" and the "Construction CALS Portal System". Through this, Benefit analysis through a pilot application of the 10 road construction sites and developing considerations and "Guide for visual information processing equipment installation-operating in construction sites"are presented. CONCLUSIONS : Through the establishment of remote site monitoring system can improve the efficiency of construction management services. In addition, Various disasters and calamities, accidents and illegal construction will be prevented in advance is expected. This is expected to further improve the quality of the facilities.

• 방송공학회논문지
• /
• 제24권2호
• /
• pp.251-263
• /
• 2019

최근 인터넷 미디어 스트리밍 수요의 증가로 인해 CDN(Content Delivery Network) 비용이 크게 증가하였으며 이를 절감하기 위한 방안의 필요성이 날로 증가하고 있다. 이러한 상황에 맞춰 최근 CDN 비용을 절감할 수 있는 WebRTC(Web Real-Time Communication) 표준 기반의 P2P(Peer-to-Peer) 통신을 병용하는 DASH(Dynamic Adaptive Streaming over HTTP) 기술이 등장하였다. 본 논문에서는, 전달 이력에 기반하여 피어(peer)를 선택하게 함으로써, 이 기술의 CDN 비용 절감 효과를 크게 개선할 수 있는 새로운 알고리듬을 제안하였다. 또한 실험실 내에서 실제 이 알고리듬을 구현하고 모바일 네트워크 환경과 유사한 환경 조건에서 실험을 시행하여 그 성능을 측정한 결과, 무작위로 피어를 선택하는 기존의 시스템과 비교하여 더 높은 CDN 비용 절감 효과를 달성할 수 있음을 보였다.