Three types of magnetic memory elements with emphasis placed on low cost and batch fabrication are investigated. The type I element consists of a wired hole in a strip of Deltamax tape. The type II element uses a stack of magnetic tape instead of the Deltamax. The type III element consists of a pre-wired grid with magnetic material deposited around the grid to simulate a wired core. The results obtained from these investigations showed conclusively that the type I element, referred to as apertured Deltamax memory cell in this paper, operates satisfactorily as a memory element. The fabrication technology is based on etching small holes through a thin Deltamax tape to form memory cells. The operation of the uncompensated and compensated memory cell is investigated. Oscillograms and graphs of the typical characteristics response of the memory cell are presented, and a qualitative description given. The type II and type III elements are found incapable of operating as a memory device because of the magnetic properties of the available tape and magnetic powder. Summaries of type II and III elements are given in Appendix I and II respectively. / Graduation date: 1967 / Best scan available for figures. Original is a photocopy.

In many instances of virtual machine deployments today, virtual machine instances are created to support a single application. Traditional operating systems provide an extensive framework for protecting one process from another. In such deployments, this protection layer becomes an additional source of overhead as isolation between services is provided at an operating system level and each instance of an operating system supports only one service. This makes the operating system the equivalent of a process from the traditional operating system perspective. Isolation between these operating systems and indirectly the services they support, is ensured by the virtual machine monitor in these deployments. In these scenarios the process protection provided by the operating system becomes redundant and a source of additional overhead. We propose a new model for these scenarios with operating systems that bypass this redundant protection offered by the traditional operating systems. We prototyped such an operating system by executing parts of the operating system in the same protection ring as user applications. This gives processes more power and access to kernel memory bypassing the need to copy data from user to kernel and vice versa as is required when the traditional ring protection layer is enforced. This allows us to save the system call trap overhead and allows application program mers to directly call kernel functions exposing the rich kernel library. This does not compromise security on the other virtual machines running on the same physical machine, as they are protected by the VMM. We illustrate the design and implementation of such a system with the Xen hypervisor and the XenoLinux kernel.

Abstract Taiwan is the 5th biggest export country of Plastics Machines, 4th one on export globally in 2005. With total employees around 8000 in 400 plants, Taiwan Plastics Machinery has built up their market position of comparable function in reasonable price level. With impact from end users¡¦ moving out of Taiwan, as well as China¡¦s macro-control on over-developed economic growth, the production volume of the whole industry is still on the growing trend. To be close to customers, following customers movement seems to be the direction for machine makers as well. However, for those small scale companies, to move out from home country is difficult due to lack of resources. The risk of investment in other region, e.g. China, is contrarily high. Export business is therefore the major factor for further business growth. And the results reveal that Taiwan Plastics Machine Makers has grown even under the weak situation. How could they make it? What is their core competence to keep the records? This study is to analyze the competence of the industry and furthermore to explore the relativity between competence and export growth. The study reveals that Taiwan Plastics Machinery export growth results mainly from the market demand. The competence is rather weak in consideration of the factors of production and competitiveness, especially from Mainland China and Korea. Therefore the growth on export volume of Taiwan Plastics Machinery has very limited relevant to its competence. To upgrade machinery¡¦s from the low price market, it is strongly recommended that improving on technology competence and innovation should be taken into strategic actions for future development.

Reproduction de : Thèse de doctorat : Génie électrique : Toulouse, INPT : 2005. / Titre provenant de l'écran-titre. Bibliogr. 71 réf.

Thèse de doctorat : Mécanique, Energétique : Nancy 1 : 2007. Thèse de doctorat : Mécanique, Energétique : Université Politehnica de Bucarest : 2007. / Thèse soutenue en co-tutelle. Titre provenant de l'écran-titre. Bibliogr.

Reproduction de : Thèse doctorat : Automatique, spécialité productique : Metz : 2004. / Titre provenant de l'écran-titre. Notes bibliographiques.

Thesis (M.S.)--Brigham Young University. Dept. of Computer Science, 2008. / Includes bibliographical references (p. 43-45).

Thesis--Ph. D., University of Hong Kong, 1982. / Also availalbe in microfilm.

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