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Search Results: 1 - 10 of 99 matches for " Vic Grout "
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Principles of Eliminating Access Control Lists within a Domain
John N. Davies,Paul Comerford,Vic Grout
Future Internet , 2012, DOI: 10.3390/fi4020413
Abstract: The infrastructure of large networks is broken down into areas that have a common security policy called a domain. Security within a domain is commonly implemented at all nodes. However this can have a negative effect on performance since it introduces a delay associated with packet filtering. When Access Control Lists (ACLs) are used within a router for this purpose then a significant overhead is introduced associated with this process. It is likely that identical checks are made at multiple points within a domain prior to a packet reaching its destination. Therefore by eliminating ACLs within a domain by modifying the ingress/egress points with equivalent functionality an improvement in the overall performance can be obtained. This paper considers the effect of the delays when using router operating systems offering different levels of functionality. It considers factors which contribute to the delay particularly due to ACLs and by using theoretical principles modified by practical calculation a model is created. Additionally this paper provides an example of an optimized solution which reduces the delay through network routers by distributing the security rules to the ingress/egress points of the domain without affecting the security policy.
The minimum rank problem over finite fields
Jason Grout
Mathematics , 2008,
Abstract: The structure of all graphs having minimum rank at most k over a finite field with q elements is characterized for any possible k and q. A strong connection between this characterization and polarities of projective geometries is explained. Using this connection, a few results in the minimum rank problem are derived by applying some known results from projective geometry.
Difficulty in Assessing Quality of Life Outcomes in a Fluctuating Disease: A Hypothesis Based on Gastroparesis
Vic Velanovich
Gastroenterology Research and Practice , 2009, DOI: 10.1155/2009/396190
Abstract: An underlying assumption of quality of life outcome research is that after some intervention a “steady-state” of quality of life is reached which can be identified as an endpoint, and, hence, the “outcome.” However, in some disease processes, no so such steady-state is reached. The hypothesis presented is that a disease process with a waxing and waning course will make it difficult to determine a quality of life endpoint. After clinical observation, a pilot study of patients with either diabetic or idiopathic gastroparesis with gastric neurostimulation their records were reviewed to identify the number of clinic visits, the number of clinic visits in which the patients were asymptomatic, much improved, improved, no change, worse, or much worse. These changes were defined as “transitions.” A “transition ratio” was calculated by dividing the number of transitions by the number of clinic visits. Preliminary results showed that of 32 patients, the median number of clinic encounters was 8 (1–35), and the median number of transitions 4 (0–22). The average transition ration was 0.56±0.31. In the case of gastroparesis, over half of all clinical encounters were associated with a transition. The implication of the hypothesis and preliminary finding suggests a difficulty to identify when the symptomatic endpoint was reached. Other methods to assess the effects of treatment in such a disease process are required to fully understand the effects of treatment on quality of life.
Plant Invasions: Symptoms and Contributors Rather Than Causes of Environmental Degradation
Vic Jurskis
Forests , 2012, DOI: 10.3390/f3040896
Abstract: Native or exotic woody plants can proliferate in dry and moist eucalypt ecosystems shading out many other native species, contributing to chronic decline of eucalypts and reinforcing unnatural fire regimes and nutrient cycling processes. Whether native or exotic, they proliferate as a consequence of disturbances which impact directly on these ecosystems. The most extensive ongoing disturbance since European occupation of Australia has been the disruption of frequent mild burning by humans. This burning maintained dynamically stable nutrient cycling processes and a competitive balance in dry and moist eucalypt systems and prevented plant “invasions”.
On Chapter Xii in Cartan's "Le?ONS Sur la GéOMéTRIE Des Espaces De Riemann"
Vic Patrangenaru
Mathematics , 2009,
Abstract: One shows that Cartan's method of adapted frames in Chapter XII of his famous treatise of Riemannian geometry, leads to a classification theorem of homogeneous Riemannian manifolds. Examples of classification in 3D dimensions obtained by Cartan are given using this powerful method.
An algorithm for the orthogonal decomposition of financial return data
Vic Norton
Quantitative Finance , 2012,
Abstract: We present an algorithm for the decomposition of periodic financial return data into orthogonal factors of expected return and "systemic", "productive", and "nonproductive" risk. Generally, when the number of funds does not exceed the number of periods, the expected return of a portfolio is an affine function of its productive risk.
Notional portfolios and normalized linear returns
Vic Norton
Quantitative Finance , 2011,
Abstract: The vector of periodic, compound returns of a typical investment portfolio is almost never a convex combination of the return vectors of the securities in the portfolio. As a result the ex post version of Harry Markowitz's "standard mean-variance portfolio selection model" does not apply to compound return data. We propose using notional portfolios and normalized linear returns to remedy this problem.
Adjusted Closing Prices
Vic Norton
Quantitative Finance , 2011,
Abstract: Historical returns depend on historical closing prices and distributions. We describe how to compute adjusted closing prices from closing price/distribution data with an emphasis on spreadsheet implementation. Then the growth of a security from one date to another (1 + total return) is just the ratio of the corresponding adjusted closing prices.
Altered Response to Biotic and Abiotic Stress in Tissue Culture-Induced Off-Type Plants of East African Highland Banana (Musa AAA East Africa)
Theodosy Msogoya,Brian Grout
Journal of Applied Sciences , 2008,
Abstract: This study was conducted to investigate black sigatoka disease and drought stress responses of off-type plants derived from shoot-tip micropropagation of East African highland banana (Musa AAA East Africa) landrace Uganda. Results showed that the off-type plants were more (p<0.05) tolerant to black sigatoka disease with the infection index of 17.5% compared to 30.1 and 22.8% of the micropropagation (MP) derived phenotypically normal plants and Conventional Propagation (CP) derived plants with no tissue culture history in their ancestry, respectively. On the contrary, the off-type plants were more (p<0.05) vulnerable to water stress with leaf senescence of 87.7% at soil water deficit of 630 millibars. The leaf senescence of the MP and CP derived plants at the same soil moisture deficit was 79.5 and 66.7%, respectively. During this stress period each off-type plant produced one sucker, while the true-to-type plants were unable to do so. Leaf structural analysis revealed that the off-type plants had higher (p<0.05) stomatal density of 16.0 mm-2 of the upper leaf surface. Conversely, the MP and CP derived plants had each 12.3 and 11.0 stomata mm-2 of the leaf upper surface. Similarly, the off-type plant leaves were more hydrophobic with higher (p<0.05) epicuticular waxiness of 684.6 μg cm-2. The epicuticular wax content of the MP and CP derived plant leaves was as low as 646.2 and 647.7 μg cm-2, respectively. The water stressed off-type plant leaves exhibited higher (p<0.05) membrane damage with ion leakage of 168.2 μS cm-1 compared to 139.7 and 136.8 μS cm-1 of the MP and CP derived plants. Moreover, the water stressed leaves of the off-type plants had enhanced total antioxidant activity of 5.17 M trolox equivalent per milligram proteins, whereas the total antioxidant activity of the MP and CP derived plant leaves was as low as 3.76 and 3.67 M trolox equivalent per milligram proteins, respectively.
Local and Remote Laboratory User Experimentation Access using Digital Programmable Logic
Ian A Grout
International Journal of Online Engineering (iJOE) , 2005,
Abstract: This paper will discuss the structure and operation of a programmable logic based experimentation arrangement that is suitable for both local and remote teaching and learning scenarios targeting electronic and microelectronic circuit design and test principles. With this experimentation arrangement, the ability to provide both local and Internet based ¢ € remote ¢ € access for the student and the teacher can provide a number of advantages where physical laboratory accessibility is limited and/or the learning experience must be undertaken with one or more of the parties remotely based. The paper concentrates on the design and example use of a system developed within the University of Limerick.
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