There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

How to Do Things With Words

Aspect] is a simple and practical aspect-oriented extension to Java With just a few new constructs, AspectJ provides support for modular implementation of a range of crosscutting concerns. In AspectJ's dynamic join point model, join points are well-defined points in the execution of the program; pointcuts are collections of join points; advice are special method-like constructs that can be attached to pointcuts; and aspects are modular units of crosscutting implementation, comprising pointcuts, advice, and ordinary Java member declarations. AspectJ code is compiled into standard Java bytecode. Simple extensions to existing Java development environments make it possible to browse the crosscutting structure of aspects in the same kind of way as one browses the inheritance structure of classes. Several examples show that AspectJ is powerful, and that programs written using it are easy to understand.

An overview of AspectJ

Context-aware computing is a mobile computing paradigm in which applications can discover and take advantage of contextual information (such as user location, time of day, nearby people and devices, and user activity) Since it was proposed about a decade ago, many researchers have studied this topic and built several context-aware applications to demonstrate the usefulness of this new technology Context-aware applications (or the system infrastructure to support them), however, have never been widely available to everyday users In this survey of research on context-aware systems and applications, we looked in depth at the types of context used and models of context information, at systems that support collecting and disseminating context, and at applications that adapt to the changing context Through this survey, it is clear that context-aware research is an old but rich area for research The difficulties and possible solutions we outline serve as guidance for researchers hoping to make context-aware computing a reality

/pdf/a-survey-of-context-aware-mobile-computing-research-1c5wp0noju.pdf

A Survey of Context-Aware Mobile Computing Research

[서평]「Component Software」 - Beyond Object-Oriented Programming -

JANET, the U.K. academic and research network, has, over almost three decades, grown from a small research network to a major national resource with a vastly expanded user base that now expects an appropriate level of service. Performance targets for the network are set in negotiation between the supplier and representatives of the funding bodies; they are documented in a set of service level agreements. Quality of service measurements are needed to monitor adherence to these agreements, to predict future behavior, and to assist in the formulation of strategy. This paper describes the measurement framework and gives examples of its use to resolve problems and guide policy.

Quality of Service Measurements on SuperJANET - The UK Academic Information Highway

Open network management is assisted by representing the system resources to be managed as objects, and providing standard services and protocols for interrogating and manipulating these objects.

/pdf/formal-description-techniques-for-object-management-4y1qsxi23z.pdf

Formal description techniques for object management

An RPC implementation is described which uses a small network of Transputers as a parallel front-end processor to reduce communications delays. Parallel processing allows different aspects of the protocol support and parameter marshalling to be overlapped, Particular attention is paid to issues which affect the performance of the system. Some comparisons are drawn with the ANSAware distributed systems platform

https://link.springer.com/content/pdf/10.1007%2F978-0-387-34947-3_32.pdf

Reducing the cost of remote procedure call

This paper describes the Voice Interaction ToolKIT(VitKit), a C++ class library for building telephone-based user interfaces. Rather than use a high-level specification approach, it is intended that programmers use the classes directly to compose interfaces, although the possibility of developing code-generators for building (parts of) interfaces is not excluded. The toolkit supports dynamic construction and re-configuration of interfaces and adopts a very flexible approach to interfacing with underlying applications.

VitKit: a Voice Interaction Toolkit

There has been a great deal of interest in recent years in the use of policies to simplify system management and to reduce costs. However, the major focus has been on the development of techniques with the greatest expressive power possible, generally viewing the policy authoring as a selfcontained activity performed by experts who understand the aims of and constraints on the system being managed. A system is normally designed to meet agreed requirements and objectives, which can be seen as constituting a design contract for the system. The aim in introducing policies should be to allow flexibility to meet changing circumstances without violating the guarantees given by this contract. This paper looks at policy specification as a step in the incremental design of systems and examines how policies need to be constrained in order to preserve the over all design objectives for the system being managed. It proposes a specification architecture for policies, discusses how it might be used, and considers how well-suited some existing specification languages and tools are to supporting this architecture.

Peter F. Linington

Papers

Quality of Service Measurements on SuperJANET - The UK Academic Information Highway

Formal description techniques for object management

Reducing the cost of remote procedure call

VitKit: a Voice Interaction Toolkit

Policy Specification: Meeting Changing Requirements without Breaking the System Design Contract