An Integrated OCL Development Environment (IDE4OCL) can significantly improve the pragmatics and praxis of OCL. We present the domain concepts, tool–level interactions with OCL and the use cases we identified in a systematic analysis of requirements for an IDE4OCL. The domain concepts is an important contribution of our work as it attempts to clarify inconsistencies in the relevant specificatio...

IoT big data real-time analytics systems need to effectively process and manage massive amounts of data from streams produced by distributed data sources. There are many challenges in deploying and managing processing logic at execution time in those systems, especially when 24x7 availability is required. Aiming to address those challenges, we have developed and tested a middleware for Distribu...

This study aims to automate the simulation of activity diagram (AD) in accordance with the OMG SysML specifications. We use the concept of model-driven engineering to transform AD into VHDL-AMS. This transformation is depicted in two transformations based on specifications given by the Object Management Group (OMG): Activity Diagram (AD) to Petri net (PN) and PN to VHDL-AMS. We have established...

Today’s Substation Automation Systems (SAS) are formed by diverse microprocessor-based devices that carry out several operations such as metering, monitoring, protection and actuation. Standards, such as IEC61850, aim at providing abstract component-based solutions that improve scalability and ease the replacement of the devices. This paper discusses the different types of communication traffic...

We’re changing gears in this column. Our recent columns have used a distributed stock quoting example to focus on different concurrency models for developing multithreaded server applications. In this column, we’ll start looking at another aspect of distributed object computing systems: decoupling the relationship between “clients” and “servers.” Our examples to date have focused exclusively on...

Transducers are sensors and actuators in order that a computer system can interact with the physical environment. An intelligent or smart transducer is the integration of an analog or digital sensor or actuator element, a processing unit, and a communication interface. In this paper we describe the basic design principles for smart transducers and compare two smart transducer interface standard...

The specification framework for business components proposed by the research group “Component Oriented Business Application System” defines seven specification levels of business components. According to this framework several notations are used to describe a business component, e. g. the OMG Interface Definition Language (OMG IDL) and the Object Constraint Language (OCL). The specification fra...

The characteristics of 3-O-methyl-D-glucose (3-OMG) uptake by frog erythrocytes were studied. 3-OMG transport was increased by adrenaline. Although the transport is inhibited by phloretin, the lack of saturation kinetics suggests that a glucose transporter doesn't exist or that its affinity for glucose is extremely low. Frog Rana balcanica red cells suspended in an isotonic medium containing ad...

This paper presents a proposal for integrating in a single CORBA middleware platform two important OMG specifications: FTCORBA, which provides fault-tolerance support for CORBA objects, and UMIOP, an unreliable multicast protocol devised for CORBA middleware. The integration model defines a middleware support which supplies the basis to a large spectrum of group communication properties for dis...

Although there is still no killer application identified for Mobile and Intelligent Agents, today Agent technology is considered to form an important part of flexible middleware platforms. A main issue in this context is the integration of Mobile and Intelligent Agent Technology, as well as Distributed Object Technology, e.g., the Common Object Request Broker Architecture (CORBA). This is parti...