• 전기전자학회논문지
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• 제19권3호
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• pp.319-326
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• 2015

본 논문에서는 OPC 스택이 없는 제어기를 OPC DA 클라이언트와 통신하도록 하는 변환 소프트웨어 개발 기법을 제안한다. 제안된 기법은 OPC DA 표준 프로토콜에 기반을 둔 OPC 서버 구현, OPC 태그 및 포인트의 정보를 확인할 수 있는 GUI 개발, OPC 프로토콜에서 개방형 표준 프로토콜로 변환하는 변환모듈 개발 등의 3가지 과정으로 구성된다. OPC DA 표준 프로토콜에 기반을 둔 OPC 서버 구현 과정은 산업용 OPC DA 클라이언트와 OPC DA 프로토콜을 통하여 데이터를 주고받을 수 있도록 PC에 서버를 구현하는 단계이다. OPC 태그 및 포인트의 정보를 확인할 수 있는 GUI 개발 과정은 OPC 서버를 구동시키고 이를 윈도우 레지스트리에 등록하며 OPC 태그 및 포인트를 확인하고 직렬통신 데이터의 송수신 확인을 위한 GUI 개발 단계이다. OPC DA 프로토콜에서 개방형 표준 프로토콜로 변환하는 변환모듈 개발과정은 OPC DA 클라이언트로부터 수신된 OPC 태그의 데이터를 개방형 표준 프로토콜을 사용하는 산업용 제어기기와 직접적으로 통신을 할 수 있도록 프로토콜을 변환함으로써 데이터를 송수신 할 수 있는 변환모듈을 개발하는 단계이다. 개발된 소프트웨어의 효율성을 평가하기 위하여 본 논문에서 개발한 서버단의 소프트웨어와 OPC 클라이언트를 연결하고, 개방형 표준 프로토콜을 사용하는 5개의 샘플 제어기기와 연결하여 테스트 한 결과 전체 송수신 패킷 중에서 96.98%의 평균 통신 성공률을 나타내었다. 따라서 본 논문에서 제안한 OPC DA 변환 소프트웨어를 이용하여 Modbus 프로토콜을 지원하는 산업용 빌딩 제어 장치와 산업용 OPC DA 클라이언트 사이에 통신을 수행시킬 수 있음이 확인되었다.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2006년도 한국컴퓨터종합학술대회 논문집 Vol.33 No.1 (A)
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• pp.250-252
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• 2006

Web technologies are gaining increased importance in automation and control systems. However, the choice of Web technologies depends on the use cases in the application environment. In industrial systems, the data can be got not only from many different field systems and devices but also from different OPC (OLE for Process Control) Servers. Current OPC Client might be able to read simple data from OPC Server, but there are some problems to get structured data and to exchange structured information between collaborating applications. Therefore, OPC Foundation has defined interfaces to OPC XML-DA (OPC XML Data Access) and OPC Complex Data that aim to solve those problems. The OPC XML-DA can facilitate the exchange of plant data across the internet, and upwards into the enterprise domain. In addition, the OPC Complex Data will extend the OPC DA specification to allow the OPC Client to read and decode any type of data from measurement and control systems on the plant floor. This paper will describe the concept of OPC XML-DA and OPC Complex Data. And then it proposes a mechanism to implement the OPC Complex Data into OPC XML-DA Server. Additionally, the paper also discusses the security aspects.

• 전기전자학회논문지
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• 제25권2호
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• pp.291-301
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• 2021

제어 및 필드 레벨에서의 OPC UA는 필드 버스를 대체할 만큼의 충분한 성능을 제공하지 못한다. OPC 협회는 실시간 및 비연결 메커니즘을 지향하고, MQTT나 AMQP와 같이 브로커 기능을 지원하는 새로운 사양인 OPC UA 발행-구독 모델을 OPC UA Part14 표준으로 추가하였다. 본 논문은 OPC UA Part14 표준을 추가한 OPC UA 발행자와 DDS 구독자 간에 상호운용성을 위한 게이트웨이에 관한 내용이다. 본 논문에서 제안한 게이트웨이는 라즈베리파이 4를 사용하였으며, DDS는 오픈 소스인 OpenDDS를 사용하였다. OPC UA 발행-구독 모듈은 Open62541 발행-구독 오픈 소스를 기반으로 해당 소스에서 제공하지 않는 기능을 추가 구현한 것인 A-Open62541 발행-구독 모듈을 사용하였다.

• Journal of information and communication convergence engineering
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• 제14권2호
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• pp.71-77
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• 2016

The combination of dispersion management (DM) and midway optical phase conjugation (OPC) is one of the promising techniques for compensating for optical signal distortion due to group velocity dispersion and nonlinear fiber effects. However, in this combination technique, midway OPC restricts the flexible optical link configuration. Therefore, the possibility of implementing the flexible optical link configuration with non-midway OPC applied to complete inline DM links is investigated in this study. It is confirmed that although the compensation using non-midway OPC for the distorted WDM channels is less effective than that using midway OPC, when non-midway OPC is placed at positions closer to the transmitters, the deployment of precompensation (i.e., the sequence of DCF + SMF)-OPC-postcompensation (i.e., the sequence of SMF + DCF) is more advantageous for the compensation. On the other hand, inverse deployment with respect to OPC (i.e., postcompensation-OPC-precompensation) is more advantageous when non-midway OPC is placed at positions closer to the receivers.

• 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.

• 한국인쇄학회지
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• 제16권3호
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• pp.43-60
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• 1998

The photosensitive properties and spectroscopic characteristics in the organic photoconductor(OPC) with carrier generation layer(CGL) of poly(vinylbutyral)(PVB) and polycarbonate(PC) doped with titanyl phthalocyanine(TiOPc) were investigated. The change of crystal structure of TiOPc dispersed with PVB and PC was shown by UV-visible reflective spectrum and FT-IR spectrum and mainly caused by the difference of solubility of solvent and the interaction between TiOPc and binder. The particle size of TiOPc dispersed with PVB measured by SEM was smaller than in PC. The crystal structure of TiOPc dispersed with PVB was amorphous type and in PC was $\alpha$type. It was found that the photosensitive properties of OPC were dependent on the change of absorbance and ionization potential of TiOPc occurred from the difference of crystal structure. In this work, the photosensitivity of OPC of TiOPc dispersed with PVB was better than PC due to the crystal type and the smaller particle size.

• 제어로봇시스템학회논문지
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• 제14권5호
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• pp.411-414
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• 2008

OPC is the preferred communication standard for sharing process control data at all levels of the enterprise and becomes the global standard, sends/receives the data with PLC programs of inspection system via network, and manages various data using OPC server. In this paper, we introduce the developed OPC client system for FPD inspection system with OPC server. To control inspection system through OPC server, we have developed libraries which consist of stage driver, switch driver, microscope driver, image processing, alignment, and task management modules. Also we have developed the test program to verify all functions precisely. We describe the mechanism of inspection system, OPC connection method, and programs.

• 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.

• 한국세라믹학회지
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• 제42권11호
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• pp.737-742
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• 2005

Rheological properties of ordinary portland cement (OPC) containing metakaoline (MK), granulated blast furnace slag (GBS) and polycarboxylate type superplasticizer (PCA) were investigated using a mini-slump test, sedimentation test and viscometer. Fluidity of cement pastes containing MK (OPC-MK, OPC-MK-GBS systems) with PCA were higher than those of the cement pastes without MK(OPC, OPC-GBS systems). Colloid suspensions with $0.1\%$ PCA were changed from stable sedimentation behaviors to flocculation behaviors in the OPC-MK, OPC-GBS and OPC-MK-GBS systems. The colloid suspensions showed stable sedimentation behaviors with PCA greater than $0.2\%$. The OPC system showed shear thinning behavior. However, the other systems showed weak shear thinning behaviors with PCA. Rheological properties of cement pastes were improved when MK and GBS were contained together. The rheological properties of OPC-MK, OPC-GBS and OPC-MK-GBS systems were improved by PCA added greater than $0.2\%$.

• 전기전자학회논문지
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• 제14권2호
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• pp.33-40
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• 2010

OPC는 산업자동화와 엔터프라이즈 시스템을 지원하는 개방형 연결 시스템이다. OPC XML-DA는 웹 서비스 기반의 플랫폼에 독립적인 통신을 제공한다. 본 논문에서는 OPC를 사용해 변전소 자동화 프로토콜로 사용되는 IEC61850을 통해 배전 프로토콜인 DNP3.0, AMI에서 사용되는 DLMS 프로토콜간의 상호 연동을 위한 전력 IT 시스템 연동 플랫폼을 제안한다.