Gary Johnston

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This paper describes the design for an operating system family called Choices being built for the Embedded Operating System (EOS) project at the University of Illinois at UrbanaChampaign. Choices embodies the notion of customized operating systems that are tailored for particular hardware configurations or for particular applications. Within one large(More)
The programming of the interrupt handling mechanisms, process switching primitives, scheduling mechanisms, and synchronization primitives of an operating system for a multiprocessor require both efficient code in order to support the needs of high-performance or real-time applications and careful organization to facilitate maintenance. Although many(More)
A study was performed to compare postoperative analgesia in children undergoing groin surgery. Patients were randomly allocated to receive ilioinguinal-iliohypogastric (I-I) nerve blocks using 0.25% plain bupivicaine (0.5 performed either percutaneously by the anaesthetist after the induction of general anaesthesia, before surgery commenced, or(More)
This paper presents three principles for the design and construction of objectoriented operating systems. These principles are based on the design of Choices, an object-oriented operating system that is implemented on the Encore Multimax shared memory multiprocessor. Choices is written entirely in C++, an object-oriented language that supports inheritance(More)
This paper describes a multiprocessor operating system simulator that was developed by the authors in the Fall semester of 1987. The sinmlator was built in response to the need to provide students with an en_t in which to build and test operatLug system concepts as part of the coursework of a third-year undergraduate operating systems course. Written in C++(More)
A study was undertaken to investigate the changes in pressure inside the epidural space in parturients in the first stage of labour. The purpose was to see whether acute local pressure changes in the epidural space were consistent with the hypothesis that there is physical movement of cerebrospinal fluid with certain changes in maternal posture. Pressure(More)
An investigation into orientation preferences shown by actin fibres within ex-situ actin as imaged by Atomic Force Microscopy (AFM) is described. Actin is a primary cytoskeletal component and is believed to play a vital role in cell structure. Actin structure images measured by AFM were analysed using automated pre-processing steps. These steps were(More)
All atomic force microscope (AFM) images suffer from distortions, which are principally produced by the interaction between the measured sample and the AFM tip. If the three-dimensional shape of the tip is known, the distorted image can be processed and the original surface form ‘restored’, typically by deconvolution approaches. This restored(More)