The emergence of Grids enables the sharing of a wide range of resources for solving large-scale computational and data intensive problems in science, engineering and business. While much has been done to build Grid middleware on top of existing operating systems, little has been done to extend the underlying operating systems for enabling and facilitating Grid computing, for example by embeddin...

The Immune system aims to provide survivability to CORBA applications, enabling them to continue to operate despite malicious attacks, accidents, or faults. Every object within the CORBA application is actively replicated by the Immune system, with majority voting applied on incoming invocations and responses to each replica of the object. The Secure Multicast Protocols are employed to enable t...

VEGA* reflects an Internet-based cooperation platform that provides holistic support for virtual enterprises. Using an integrated, layered framework and taking a top-down approach, an overview is given of the various, interdependent system levels. The core element is a three-layer service architecture. In addition to a ubiquitous marketspace, which serves as a portal gate for virtual collaborat...

0 7 4 0 7 4 5 9 / 0 0 / $ 1 0 . 0 0 © 2 0 0 0 I E E E This article illustrates the automation of the most expensive phases of a Goal Question Metrics (GQM) measurement process. In particular, I describe the use of a specific tool for the definition, collection, analysis, and feedback of measures, and the techniques to interface such a tool with a configuration management system and metrics tool...

We present a user interface paradigm for database management systems motivated by scienti c visualization applications. Our graphical user interface includes a \boxes and arrows" notation for database access and a ight simulator model of movement through information space. We also provide means to specify a hierarchy of abstracts of data of di erent types and resolutions. In addition, multiple ...

As web-based technologies have changed teaching and learning and the support of learning, what it means to be literate has also changed. Reading and writing are now only part of what people have to learn in order to communicate in a technology driven society. A new concept of literacy has emerged that is variously described as e-literacy, digital literacy, silicone literacies, technological lit...

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We evaluated the effect of providing error-flagging, i.e., error detection but not error-correction support, during testing. We found that error-flagging is not a substitute for knowing the correct answer. It does not help students game the tutor. But, it does help students improve their test score.

Time is essential in modeling the constantly changing world. However, conventional database systems represent the real world with only a tenseless snapshot that is inadequate for many applications where facts and data need to be interpreted in the context of time. In this work we examine some of the issues applicable to temporal modeling, including examples which illustrate the demands imposed ...

1 I . Fetus and Newborn Committee, Canadian Pediatric Society. Support for parents experiencing perinatal loss. Can Med Assoc f 1983;129:335-339. 12. Hildebrand WL, Schreiner RL. Helping parents cope with perinatal death. Am Fam Physician 1980;22(5):121-125. 13. Kennel1 JH, Slyter H, Klaus MH. The mourning response to the death of a newborn infant. N Engl J Med 1970;283(7): 344349. Hughes P. Th...