Pattern Identification - A Foundation for Research in the Emphasis of Design Patterns in Systems Engineering and Knowledge Capture

Pattern Language describes the morphology and functionality of a system in the absence of design particulars. Harnessing this capability will provide the Systems Engineering discipline a means of managing the development of increasingly complex systems with increasingly distributed design teams while capturing and retaining knowledge for future generations. Pattern Language is a syntax for describing, and structurally relating, design patterns. Design patterns contextually describe the application of domain knowledge in the engineered solution to the force balance problem. The parallels between pattern recognition and application, as a fundamental stage of human learning, and pattern observation within a complex system, suggests pattern language may be a valuable tool in the capture and dissemination of knowledge. Pattern application has enjoyed considerable study over the last several decades, however much of this work has focused on the replication of design particulars. This work returns to the roots of Pattern Language and explores the utility of patterns as an architectural description and guide, and knowledge capture method, for complex system development beginning with the identification of a time proven design pattern

Four Work-Ins by Australian Journalists, 1944-80

During industrial disputes with employers between 1944 and 1980 the Australian Journalist's Association occasionally turned to the tactic of the work-in, producing wild cat newspapers during strikes in Sydney. These newspapers (The News, and The Clarion) exemplified problematic elements of the work-in as a working-class strategy. While single incident studies of the work-in have been conducted in Australia, the Australian Journalist Association work-ins present a time series of struggle. This time series allows for a broader evaluation of the radical content of the work-in and indicates that the tactic can become systematised, less radical, and less participatory when not connected to a broader generation of workplace radical behaviour by workers. In short: the work-in, much like the strike or go slow, can become a tame cat tactic – it is not inherently transgressive or opposed to capitalist production. Expectedly, the first work-ins were more radical in scope, presenting a newspaper which fully duplicated the commodity produced under capitalist control and in some ways exceeded the scope presented by capitalist organised journalism in both a material and a cultural sense. However, this radical economic potential dissipated by the end of the time series of work-ins. Instead of providing an alternative commodity fit for market, the tactic produced propaganda pieces aimed primarily at the members of the community who would be predisposed to favour the journalist's case. The 1980s Clarion was not a daily newspaper of news, sport, racing, women's interest, classifieds, and general opinion. This change will be explained in terms of human causes such as skills loss, production process causes such as computerisation and wire services, and broader social causes such as the changing role of the newspaper in Australian society.The symposium is organised on behalf of AAHANZBS by the Business and Labour History Group, The University of Sydney, with the financial support of the University’s Faculty of Economics and Business

Development of Inspection for Friction Stir Welds for Rocket Fuel Tanks

During development of the Ares I weld processes nondestructive and destructive testing were used to identify and characterize defects that occurred. These defects were named and character noted. This catalogue of defects and characteristics was then used to develop inspection methods for Self Reacting Friction Stir Welds (SR ]FSW) and Conventional Friction Stir Welds (C ]FSW). Dye penetrant, eddy current, x ]radiography, single element ultrasonic, and phased array ultrasonic (PAUT) inspection procedures were developed to target the expected defects. Once the method procedure was developed a comparison was performed to allow for selection of the best inspection method. Tests of the effectiveness of the inspection were performed on purposely fabricated flawed specimens and electrodischarge machined notches. The initial test results prompted a revisit of the PAUT procedure and a redesign of the inspection. Subsequent testing showed that a multi ]angle PAUT inspection resulted in better detection capability. A discussion of the most effective orientations of the PAUT transducer will be presented. Also, the implementation of the inspection on production hardware will be presented. In some cases the weld tool is used as the transducer manipulator and in some cases a portable scanner is use

Nitrate Sources in the Old Ausable River Channel and Adjacent Aquifers in Pinery Provincial Park, Ontario Canada

The Old Ausable River Channel (OARC) is located parallel to the shoreline of Lake Huron between the towns of Grand Bend and Port Franks, Ontario, Canada. Largely isolated from other water bodies, OARC water levels are mostly maintained by shallow groundwater. It is periodically in a state of eutrophication; a state commonly attributed to local anthropogenic nitrate loading. The primary goal of this work is to identify and quantify the sources of nitrate in the OARC watershed by measuring the oxygen and nitrogen isotope compositions of nitrate. We have developed a dual method approach to measure the δ15N, δ18O and Δ17O of nitrate at low concentrations. This approach is necessary to fully correct for mass interferences, scale compression, and oxygen isotope exchange with water. We measured the spatial and temporal variations of nitrate isotopic compositions and concentrations within, and contributing to, the OARC watershed waters and precipitation in a multi-year monthly sampling and analysis program. We use these data and Bayesian modeling techniques to quantify nitrate source contributions to the OARC and the adjacent ground waters. We show that the Northeastern portion of the river channel is contaminated by septic effluent. Nitrate produced in the atmosphere is the single largest source of nitrate in the central portion of the OARC; these results highlight the potential importance of regional transport of anthropogenic nitrate. The Southwestern portion of the OARC exhibits elevated atmospheric nitrate loading but receives a periodic influx from the Ausable River Cut water that is contaminated by agricultural run-off. These results can be used to guide watershed management, in particular, of wastewater effluent in Grand Bend and wastewater treatment in Pinery Provincial Park. We compared nitrate isotopes in precipitation from Pinery Provincial Park and London, Ontario. Nitrate nitrogen isotope compositions at both sites overlapped known ranges for vehicular-emitted NOx. For London, oscillations in nitrate nitrogen isotope compositions are attributable to seasonal fluctuations in soil and anthropogenic emissions. Pinery Provincial Park precipitation exhibits irregular nitrogen isotope oscillations that may reflect its location distal from upwind anthropogenic emissions. The oxygen isotope compositions of nitrate in precipitation at Pinery Provincial Park and London, Ontario, exhibit oscillations that arise from seasonal variations in atmospheric oxidation pathways

A Piece of the Puzzle: Can behavioral insights help understand currency returns?

This paper finds further evidence using a Cointegrated Vector Autoregression to support claims against the Uncovered Interest Rate Parity (UIP) ex post, referred to as the Forward Discount Anomaly (Fama, 1984). This anomaly suggests predictable profits simply from investing in a country with a higher interest rate. Potential explanations could be attributed to risk or deviations from the rational expectations hypothesis. UIP ex ante is tested using survey data. These results indicate a time-­‐ varying risk premium. Further it is found that this premium is related to the gap between the exchange rate and Purchasing-­‐Power-­‐Parity value. Additionally it is determined that investor expectations are consistent with some behavioral rules; extrapolative and adaptive expectations drive deviations from PPP which transitions to regressive expectations when the gap is very large

Developing a Software Tool for Precise Kernel Measurements

Tracing the flow of control in a running kernel is useful for determining where performance can be improved, for instance. FKT (Fast Kernel Tracing) is a set of tools to achieve such tracing. However, its recording size was limited to the size of available memory, lacking a flushing mechanism. We here describe how such flushing was added to FKT without too much perturbing the measurements, how new issues raised by long recordings were addressed, as well as the new features that became useful

Determination of high temperature strains using a PC based vision system

With the widespread availability of video digitizers and cheap personal computers, the use of computer vision as an experimental tool is becoming common place. These systems are being used to make a wide variety of measurements that range from simple surface characterization to velocity profiles. The Sub-Pixel Digital Image Correlation technique has been developed to measure full field displacement and gradients of the surface of an object subjected to a driving force. The technique has shown its utility by measuring the deformation and movement of objects that range from simple translation to fluid velocity profiles to crack tip deformation of solid rocket fuel. This technique has recently been improved and used to measure the surface displacement field of an object at high temperature. The development of a PC based Sub-Pixel Digital Image Correlation system has yielded an accurate and easy to use system for measuring surface displacements and gradients. Experiments have been performed to show the system is viable for measuring thermal strain