Describes a software tool which compiles a high level, objectoriented specification to a functionally equivalent neural net. It also explores the implications of this approach for the theory and construction of neura...
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Describes a software tool which compiles a high level, objectoriented specification to a functionally equivalent neural net. It also explores the implications of this approach for the theory and construction of neural nets.< >
Introduces the main concerns and development of a model for security in distributed systems. The threats which need to be addressed in any security model for distributed system are examined. The nature of object orien...
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Introduces the main concerns and development of a model for security in distributed systems. The threats which need to be addressed in any security model for distributed system are examined. The nature of objectoriented distributed systems is looked at in the security context and the outline of a model is drawn. Finally some issues on the use of the model are discussed.< >
object technology is founded on the principle that objects identified in the problem can be represented in software in the solution. Thus object design methods involve constructing an object-oriented model of the prob...
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object technology is founded on the principle that objects identified in the problem can be represented in software in the solution. Thus object design methods involve constructing an object-oriented model of the problem and mapping this model into a software design. The goal is to build in software a richer representation of the problem than is needed to meet the immediate needs, so that the software can adapt as needs change. By contrast, traditional software design techniques have taken general analysis models and transformed them into specific solutions, thereby losing the generality and making changes harder to incorporate. object designs can support the extra burden of generality because of the excellent structuring capabilities of objects. The object-oriented concepts of encapsulation and polymorphism are central to making this possible. Six specific OO methods are compared.< >
In recent years there has been considerable interest in applying sensor array signal processing techniques to a variety of radar applications. The use of adaptive spatial and temporal filtering techniques has been wid...
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In recent years there has been considerable interest in applying sensor array signal processing techniques to a variety of radar applications. The use of adaptive spatial and temporal filtering techniques has been widely discussed. The relative expense of building hardware and conducting experiments has led to a strong emphasis on simulation as a way of developing new equipment, but there are currently no software tools available that are particularly suited to the problems of simulating sensor array systems. This paper describes the current state of development of an adaptive array processing toolset (AdAPT) (1), which is capable of modelling systems comprising large numbers of sensors. AdAPT encompasses modelling a target environment, design of array hardware, application and design of signal processing algorithms and the display and interaction of data as it flows through the design scenario. We also discuss the graphical user interface to AdAPT.
HOOD (hierarchical object-oriented design) is an object-oriented design method which was originally targeted at Ada program development. object-oriented design approaches are based on identifying the classes of object...
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HOOD (hierarchical object-oriented design) is an object-oriented design method which was originally targeted at Ada program development. object-oriented design approaches are based on identifying the classes of objects in a system. Classes are described in terms of their behaviour and structure, with each object modelling a real-world entity. A class and its operations are defined as a single unit. Each object is a member of a class and the operations are defined for all members of a class. An overview of HOOD is given and various HOOD projects are outlined.< >
Simulation has proven to be a highly effective means of testing the operation of systems during development, and prior to in-service modification, but it is not as widely used in industry as might be expected. The pri...
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Simulation has proven to be a highly effective means of testing the operation of systems during development, and prior to in-service modification, but it is not as widely used in industry as might be expected. The prime reason for this is that model development for simulation often requires the combination of deep knowledge of the process and specialised modelling skills. One solution to this problem is the provision of a library of re-useable sub-models, which can facilitate development of hierarchically structured models. This paper illustrates the application of object-oriented methodology to achieving two major goals-the reduction of complexity by hierarchical decomposition, and maximisation of the re-use of developed models. Two applications are discussed-the generation of hierarchical models and the use of function blocks in control system design-with respect to the three dominant OO concepts of encapsulation, inheritance and polymorphism. It outlines requirements for a modelling and control tool and highlights how an OO methodology can help simplify the use of such a tool. OO implementations of modelling and control tools are described. The tools described were implemented using compiled OO languages (Pascal and C++), with the consequence that the user of she tool does not get all the advantages which would occur in an interpretive environment such as Smalltalk.< >
The Battlefield Sensor Simulator (BSS) system, built at RSRE Malvern, provides for the modelling and performance evaluation of new and proposed military sensor systems. Both sensor tasking and sensor mixes may be test...
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The Battlefield Sensor Simulator (BSS) system, built at RSRE Malvern, provides for the modelling and performance evaluation of new and proposed military sensor systems. Both sensor tasking and sensor mixes may be tested interactively. The BSS system covers a battlefield area of up to 50000 square kilometres and can simulate the movement of up to 100000 targets in real time. The architecture of the BSS consists of a centralised computing facility which models battlefield terrain, culture and scenarios together with a collection of client computers which model battlefield sensors. The authors discuss the object-oriented framework which is constituted by a collection of objects known as the Generic object Set (GOS). The object-oriented framework is written in the programming language Simogen which is an object based version of C. In Simogen, objects have state variables and procedural responses. An important feature of the BSS system is that it can support concurrent sensor models running on different client computers. In the future this will form a basis from which the data fusion of different sensor systems may be modelled.< >
The authors report and evaluate the experience of applying object-oriented techniques to the development of a real-time system for monitoring and control of remote sites. The system which is currently installed at sev...
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The authors report and evaluate the experience of applying object-oriented techniques to the development of a real-time system for monitoring and control of remote sites. The system which is currently installed at several sites in the UK and elsewhere in Europe also includes database management functions and an interactive operator interface. The authors focus on the object-oriented aspects of the system architecture and on the development process model. Together they provide a technical and organisational framework for projects of similar nature. The pros and cons of the solutions adopted are discussed.< >
Ever more extensive computer systems are required by complex, multi-centre organisations. The distributed objectoriented systems model matches well to these requirements, combining the attractive properties of persis...
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Ever more extensive computer systems are required by complex, multi-centre organisations. The distributed objectoriented systems model matches well to these requirements, combining the attractive properties of persistent object systems with the contents addressability of the conventional relational model. The author focuses on the application of the objectoriented model in large-scale concurrent distributed database systems. In designing a really large scale and complex system such as a major healthcare application, the simplest approach is to build a model of the existing human organisation and its information systems. Fortunately, with today's technology this is also a cost/effective approach to implementation.< >
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