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Optical proximity correction (OPC) is a photolithography enhancement technique commonly used to compensate for image errors due to diffraction or process effects. The need for OPC is seen mainly in the making of semiconductor devices and is due to the limitations of light to maintain the edge placement integrity of the original design, after ...
The OPC specification was based on the OLE, COM, and DCOM technologies developed by Microsoft Corporation for the Microsoft Windows operating system family. The specification defined a standard set of objects, interfaces e.g. IDL and methods for use in process control and manufacturing automation applications to facilitate interoperability.
OPC Unified Architecture (OPC UA) is a cross-platform, open-source, IEC62541 standard for data exchange from sensors to cloud applications developed by the OPC Foundation. Distinguishing characteristics are: [ 1 ]
OPC Foundation, a related consortium Operations Planning and Control, from Tivoli Software , known as IBM Tivoli Workload Scheduler Optimized Power Control , a method to adjust laser power when writing optical media.
The standard has specified five mapping (IEC 61400-25-4) to communication protocol stacks in order to address the real wind power business needs for communication. The mappings specified in the part of IEC 61400-25 comprises a mapping to SOAP-based web services, OPC/XML-DA, IEC 61850-8-1 MMS, IEC 60870-5-104 and a mapping to DNP3.
Various abbreviations used for this type of contract are LSTK for lump sum turn key, EPIC for engineering, procurement, installation & commissioning and EPCC for engineering, procurement, construction and commissioning. Use of EPIC is common, e.g., by FIDIC and most Persian Gulf countries. Use of LSTK is common in the Kingdom of Saudi Arabia.
The OPC Data Access Specification is the first of a group of specifications known as the OPC Classic Specifications. [1]OPC Data Access is a group of client–server standards that provides specifications for communicating real-time data from data acquisition devices such as PLCs to display and interface devices like Human–Machine Interfaces (HMI), SCADA systems [2] and also ERP/MES systems. [3]
Engineering, aviation, education, automotive company P A Gulf Drilling International: Oil & gas Exploration & production Doha: 2004 Part of QatarEnergy: S A Gulf Helicopters: Consumer services Airlines Doha: 1970 Charter helicopters P A Hamad Medical Corporation: Health care Health care providers Doha [5] 1979 State-owned healthcare provider S A