Efficient consolidation-aware VCPU scheduling on multicore virtualization platform

Multicore processors are widely used in today's computer systems. Multicore virtualization technology provides an elastic solution to more efficiently utilize the multicore system. However, the Lock Holder Preemption (LHP) problem in the virtualized multicore systems causes significant CPU cycles wastes, which hurt virtual machine (VM) performance and reduces response latency. The system consolidates more VMs, the LHP problem becomes worse. In this paper, we propose an efficient consolidation-aware vCPU (CVS) scheduling scheme on multicore virtualization platform. Based on vCPU over-commitment rate, the CVS scheduling scheme adaptively selects one algorithm among three vCPU scheduling algorithms: co-scheduling, yield-to-head, and yield-to-tail based on the vCPU over-commitment rate because the actions of vCPU scheduling are split into many single steps such as scheduling vCPUs simultaneously or inserting one vCPU into the run-queue from the head or tail. The CVS scheme can effectively improve VM performance in the low, middle, and high VM consolidation scenarios. Using real-life parallel benchmarks, our experimental results show that the proposed CVS scheme improves the overall system performance while the optimization overhead remains low.

Season-ticket holder satisfaction and sponsor-related behaviour: evidence of a positive relationship

Fan attention and response to sponsorship is affected by a range of variables, including the duration of sponsorship and fan commitment to the sporting organisation. The results of surveys of the members of six Australian Football League clubs indicated that there is a positive relationship between the satisfaction levels of season-ticket holders and their orientation towards club sponsors' products and brands.

The relationship between AFL season-ticket holder satisfaction and sponsor-related behaviour

In a sporting context, it has been acknowledged that fan attention and response to sponsorship is affected by a range of variables, including the duration of sponsorship and fan commitment to the sporting organisation. The results of surveys of the members of five AFL clubs indicated that there is a positive relationship between the satisfaction level of season-ticket holders and their orientation toward club sponsors’ products and brands. Despite the weak relationships found in this research, the results suggest that more satisfied season-ticket holders will seek to use club sponsors’ products, and this is yet another reason to manage the satisfaction of customers.

Determination of yield and erosion damage functions using subjectively elicited data: application to small holder tea in Sri Lanka

Tea has been Sri Lanka's major export earner for several decades. However, soil erosion on tea-producing land has had considerable on-site and off-site effects. This study quantifies soil erosion impacts for smallholder tea farms in Sri Lanka by estimating a yield damage function and an erosion damage function using a subjective elicitation technique. The Mitscherlich-Spillman type of function was found to yield acceptable results. The study indicates that high rates of soil erosion require earlier adoption of soil conservation measures than do low rates of erosion. Sensitivity analysis shows the optimum year to change to a conservation practice is very sensitive to the discount rate but less sensitive to the cost of production and price of tea.

Developing a scale to measure season ticket holder attitudes towards the professional sports club offering

Given the importance of season ticket holders (STH) to sporting organisations, we empirically examine a scale for measuring their attitudes to the season ticket product. This involved identifying through qualitative research and past literature, the various elements that are perceived to comprise the season ticket package and developing items to measure STH attitudes to them. The season ticket package was decomposed into six key components, closely mirroring past research. A survey of over 2,500 STH of a professional sporting organisation was then conducted, incorporating items related to these six areas, overall satisfaction and disconfirmation of expectations. The results of Exploratory Factor Analysis on those items is presented here, with results suggesting the items are valid measures of season ticket holder attitudes that capture the breadth of the STH experience.

A longitudinal analysis of the halo effect of team success on season ticket holder attitudes

Although it seems counter-intuitive, past studies have found that the attitudes to the on-field performance of a team have only a small direct impact on the overall satisfaction of members (season ticket holders). By managing other aspects of the package well (e.g., ticketing, customer service, communications), membership can satisfy even when the on-field results do not. In this research, we examine whether on-field performance, measured both objectively and subjectively, has an indirect "halo" effect on attitudes towards those other aspects of the membership offering. An examination of data collected through 63 member satisfaction surveys of 14 different AFL clubs in the period 2003 - 2007 suggests that, predictably, a change to the win-loss ratio has a strong impact on attitudes to on-field performance and overall satisfaction. However, changes in on-field performance are also significantly correlated with changes in attitudes to areas like the extent to which one feels personally involved with the club and the administration of the club. The data allows the determination of the extent ofthis halo effect where a change in on-field performance (win percentage) has a predictable impact on attitudes to other aspects of the clubs activities, allowing club management to benchmark their performance in these areas even when on-field results fluctuate year to year.

The immediate impact of coach succession events on season ticket holder attitudes

This study is the first to examine the immediate impact that succession events (e.g., removal and hiring) involving head coaches have on season ticket holder (STH) attitudes like satisfaction and renewal intentions. Grounded within a customer equity framework, large-scale survey data from cases of two professional sport teams is presented showing STH attitudes directly before and after major succession events. The data shows that appointing a new coach was met with increases in positive attitudes toward almost every aspect of the STH experience, where the case of removing a coach had no meaningful impact on attitudes. The findings of these cases reaffirm the view that coach succession is a multiple-phase process including distinct stages of removal and replacement. While it is the desire for improved on-field performance that often motivates coach succession, our findings suggest the impact of succession activities on fans is more wide ranging, with significant implications for marketers who manage fan relationships. In guiding the management of a team's fans, coach removal alone should not be relied upon to change attitudes or intentions toward a club. Appointing new leaders completes the cycle, increasing positive STH attitudes and, most importantly, giving an immediate lift to renewal likelihood.

High colonization by native arbuscular mycorrhizal fungi (AMF) of rubber trees in small-holder plantations on low fertility soils in North East Thailand

Rubber tree is a very important crop in Thailand, representing an essential source of income for farmers. In the past two decades, rubber tree plantations have been greatly expanding in unfavorable areas, where climate conditions are difficult and soil fertility is very poor. To optimize latex yields, mineral fertilizers have been widely used. A better understanding of the roles of the biological compartment in soil fertility is essential to determine alternative management practices to sustain soil fertility and optimize latex yields. Arbuscular mycorrhizal fungi (AMF) are widely recognized as beneficial for plants, mainly through their role in improving plant nutrient uptake. The objective of this study was to assess the AMF populations in rubber tree plantations and the impact of both soil characteristics and plantation age on these communities. Our results showed that all rubber trees were highly colonized, regardless of the soil structure and nutrient contents. AMF colonization was not affected by the age of the trees, suggesting that maintaining the symbiosis is likely to be beneficial at all stages. A better understanding and management of the microbial communities would contribute to maintaining or restoring soil fertility, leading to a better tree growth and optimized latex yield.

The tax treatment of employee stock options : generous to a fault

In the 2000 budgets, both the federal and Ontario governments introduced changes to the tax treatment of employee stock options for the explicit purpose of making their tax treatment in Canada similar to or more favourable than that in the United States. The federal budget added a deferral, similar to that currently applicable to options granted by Canadian-controlled private corporations, for up to $100,000 per year of public company stock options. The Ontario budget introduced an exemption from tax for employees involved in research and development on the first $100,000 per year of employee benefits arising on the exercise of qualified stock options or on eligible capital gains arising from the sale of shares acquired by the exercise of eligible stock options. These proposals reflect the apparent acceptance by the two governments that there is a “brain drain” from Canada to the United States of knowledge workers in the “new” economy and that reductions in Canadian taxes should stem this drain. In the author’s view, the tax treatment of employee stock options, even without these changes, is overly generous. Both the federal and provincial proposals ignore the fact that most employee stock options are taxed more favourably in Canada than in the United States in any event. In particular, most employee stock option benefits in Canada are taxed at capital gains tax rates, whereas in the United States most are taxed at full rates. While the US Internal Revenue Code does provide capital gains tax treatment for certain employee stock option benefits, a number of preconditions must be met. Most important, the shares acquired pursuant to the options must be held for a minimum of one year after the option is exercised. In addition, there are monetary limits on the amount of options that qualify for capital gains treatment. In Canada, there are generally no holding period requirements or monetary limits that apply in order for the option holder to benefit from capital gains tax rates. Empirical evidence indicates that the vast majority of employees in the United States exercise their options and immediately sell the shares acquired. These “cashless exercises” do not benefit from capital gains treatment in the United States, whereas similar cashless exercises in Canada generally do. This empirical evidence suggests not only that the 2000 budget proposals are unwarranted, but also that the existing treatment of employee stock options in Canada is already more generous than that in the United States. This article begins with a theoretical “benchmark” for the taxation of employee stock options. The author suggests that employee stock options should be treated in the same manner as other income from employment. In theory, the value of the benefit should be included in income when the option is granted or vests. However, owing to the practical difficulty of valuing employee stock options, the theoretical benchmark proposed is that the value of the benefit (the difference between the fair market value of the shares acquired and the strike price under the option) be taxed when the shares are acquired, and the employer be entitled to a corresponding deduction. The employee stock option rules in Canada and the United States are then compared and contrasted with each other and the benchmark treatment. The article then examines the arguments that have been made for favourable treatment of employee stock options. Included in this critique is a review of the recent empirical work on the Canadian brain drain. Empirical studies suggest that the brain drain—if it exists at all—is small and that, despite what many newspapers and right-wing think-tanks would have us believe, lower taxes in the United States are not the cause. One study, concluding that taxes do have an effect on migration, suggests that even if Canada adopted a tax system identical to that in the United States, the brain drain would be reduced by a mere 10 percent. Indeed, even if Canada eliminated income tax altogether, it would not stop the brain drain. If governments here want to spend money in order to stem the brain drain, they should focus on other areas. For example, Canada produces fewer university graduates in the fields of mathematics, sciences, and engineering than any other G7 country except Italy. The short supply of university graduates in these fields, the apparent loss of top-calibre academics to US
universities, and the consequent lower levels of university research in these areas (an important spawning ground for new ideas in the “new” knowledge-based economy) suggest that Canada may be better served by devoting more resources to its university institutions, particularly in post-graduate programs, rather than continuing the current trend of budget cuts that universities have endured and may further endure if taxes are reduced.
As far as employee stock options are concerned, if Canada does want to look to the United States for guidance on tax reform (which it seems to do with increasing frequency of late), it should adopt the US rules applicable to nonstatutory options, which are close to the proposed benchmark treatment. In the absence of preferential tax treatment, employee stock options would still be included in compensation packages provided that there were sound business reasons for their use. No persuasive evidence has been put forward that the use of stock options, in the absence of tax incentives, is suboptimal. Indeed, the US experience suggests quite the opposite.

Effectively finding relevant web pages from linkage information

This paper presents two hyperlink analysis-based algorithms to find relevant pages for a given Web page (URL). The first algorithm comes from the extended cocitation analysis of the Web pages. It is intuitive and easy to implement. The second one takes advantage of linear algebra theories to reveal deeper relationships among the Web pages and to identify relevant pages more precisely and effectively. The experimental results show the feasibility and effectiveness of the algorithms. These algorithms could be used for various Web applications, such as enhancing Web search. The ideas and techniques in this work would be helpful to other Web-related researches.

Using geometric shape variations to create an inverse model for a sheet metal process

The output of the sheet metal forming process is subject to much variation. This paper develops a method to measure shape variation in channel forming and relate this back to the corresponding process parameter levels of the manufacturing set-up to create an inverse model. The shape variation in the channels is measured using a modified form of the point distribution model (also known as the active shape model). This means that channels can be represented by a weighting vector of minimal linear dimension that contains all the shape variation information from the average formed channel.

The inverse models were created using classifiers that related the weighting vectors to the process parameter levels for the blank holder force (BHF), die radii (DR) and tool gap (TG) of the parameters. Several classifiers were tested: linear, quadratic Gaussian and artificial neural networks. The quadratic Gaussian classifiers were the most accurate and the most consistent type of classifier over all the parameters.