Transmission Control Protocol (TCP) has been recognized as the most important transport-layer protocol for the Internet. It is distinguished by its reliable transmission, flow control, and congestion control. However, the issue of fair bandwidth-sharing among competing flows was not properly addressed in TCP. As web-based applications and interactive applications grow more popular, the number of short-lived flows conveyed on the Internet continues to rise. With conventional TCP, short-lived flows will be unable to obtain a fair share of available bandwidth. As a result, short-lived flows will suffer from longer delays and a lower service rate. It is essential for the Internet to come up with an effective solution to this problem in order to accommodate the new traffic patterns. With a more equitable sharing of bottleneck bandwidth as its goal, two cross-layer stateless queue management schemes featuring Drop Maximum (DM) and Early Drop Maximum (EDM) are developed and presented in this dissertation. The fundamental idea is to drop packets from those flows having more than an equal share of bandwidth and retain low level of queue occupancy. The congestion window size of a TCP sender is carried in the options field on each packet. These proposed schemes will be exercised on routers and make its decision on packet dropping according to the congestion windows. In case of link congestion, the queued packet with the largest congestion window will be dropped from the queue. This will lower the sending rate of its sender and release part of the occupied bandwidth for the use of other competing flows. By so doing, the entire system will approach an equilibrium point with a rapid and fair distribution of bandwidth. As a stateless approach, these proposed schemes inherit numerous advantages in implementation and scalability. Extensive simulations were conducted to verify the feasibility and the effectiveness of the proposed schemes. For the simple proposed packet discard scheme, Drop Maximum outperforms the other two stateless buffer management schemes, i.e. Drop Tail and Random Early Drop, in the scenario of homogeneous flows. However, in heterogeneous flows, Random Early Drop gains superiority to packet discard schemes due to its additional buffer occupancy control mechanism. To overcome the lack of proper buffer occupancy control, Early Drop Maximum is thus proposed. As shown in the simulation results, this proposed scheme outperforms existing stateless techniques, including Drop Tail, Drop Maximum and Random Early Drop, in many respects, such as a fair sharing of available bandwidth and a short response time for short-lived flows.

This study is to investigate the relationship among profit sharing, sharing fairness, job involvement and working performance by the empirical research. The goal of this study is to suggest the company how to design more incentive system from the profit sharing and sharing fairness when the profit sharing will become the operation expense in Taiwan. 500 questionnaires were sent to the company which is based on the north of Hsin-Chu County. The valid questionnaires are 174 copies in total after the return. Upon the empirical analysis, the important findings are as the following: 1.Profit sharing system and sharing fairness are positive correlated. The more the employees are satisfied with the profit sharing system and feel the importance of the profit sharing system, the higher their awareness is on the fairness of the profit distribution and execution procedure. 2.Profit sharing system is not significant to job involvement and working performance. When the time goes by, the incentive effect from the profit sharing system will decrease. Therefore, the effect of profit sharing system is not significt to job involvement and working performance. 3.Sharing fairness is not significant to job involvement, but significant to the goal achievement of working performance and collaboration¡¦s satisfaction. If the employee doesn¡¦t understand the profit sharing system, it easily causes the unfair feeling and it might impact on the job involvement. But if the company can emphasize the fairness of the execution procedure, it can increase the possibility of the goal achievement and enhance the collaboration¡¦s satisfaction. 4.Profit sharing system can¡¦t affect the working performance and job involvement by the intermediate effect of sharing fairness. Since the profit sharing system has been implemented for a while and became part of salary, it can¡¦t draw more attraction as the beginning. In addition, if the employee starts to suspect the fairness of the profit sharing, it will result in the less influence on job involvement and working performance.

Includes vita. / Title from PDF of title page. / Document formatted into pages; contains 104 pages. / Thesis (Ph.D.)--University of South Florida, 2003. / Includes bibliographical references. / Text (Electronic thesis) in PDF format. / ABSTRACT: We studied perceptions parental differential treatment as reported by parents and children in two different settings. Perceptions of differential affection and control were examined in healthy families and in families that include a child diagnosed with Type 1 diabetes. Parental differential treatment was assessed using questionnaires that measured perceptions of absolute parenting for children and their siblings. Difference scores were subsequently utilized to generate perceived parental differential treatment scores. Participants were 61 parents (half with healthy children, half with one child who has diabetes) and 62 children (half comprising sibling pairs unaffected by any medical problems, half including one child with Type 1 diabetes). Children within the sibling pairs were between 11 and 18 years of age and approximately two years apart, on average. / ABSTRACT: Parents were also asked about their children's emotional/behavioral adjustment and adherence to prescribed medical regimen (in the diabetes group), and their levels of parenting stress. Children were also administered measures regarding their emotional/behavioral adjustment, average adherence (in the diabetes group), and perceptions of deservedness of parental treatment perceived. No differences in strength of correlations between ratings of parental differential treatment and child adjustment iv were detected across groups. Significant differences, however, emerged with regard to type of perceived parental differential treatment that related to child adjustment scores across groups. Relationships were also detected between perceived parental differential treatment and ratings of adherence and measures of glycemic control in the diabetes group. / ABSTRACT: Perceived deservedness as rated by children, ratings of absolute parenting, and parenting stress were observed to moderate the relationship between ratings of parental differential treatment and child adjustment. Parental differential treatment scores predicted unique variance in reported child behavior problems above and beyond that predicted by absolute parenting measures. Differences in relationships across groups, the role of gender, and the importance of context and family in studying perceptions of parental differential treatment and child adjustment are discussed. / System requirements: World Wide Web browser and PDF reader. / Mode of access: World Wide Web.

Title from PDF of title page. / Document formatted into pages; contains 76 pages. / Thesis (M.A.)--University of South Florida, 2003. / Includes bibliographical references. / Text (Electronic thesis) in PDF format. / ABSTRACT: The present study examined the effects of perceptions of fairness, prejudice and collective self-interest on the affirmative action attitudes of 85 White undergraduate students. Participants were classified as non-racists, modern racists or old-fashioned racists based on their scores on the Implicit Association Test and Attitudes Toward Blacks scale. In the first phase of the study, participants read affirmative action information preceded by either high or low attention instructions. In the second phase, fairness, status of position and race of the target of an affirmative action plan were manipulated using vignettes. No significant differences were found in the first phase of the study. In the second phase, it was found that when the plan was unfair and the target Black, participants preferred plans for low status positions to plans for high status positions. / ABSTRACT: This finding was consistent with the idea that fairness, race and collective self-interest are related to affirmative action attitudes. However, contrary to the initial hypotheses, these effects did not interact with level of prejudice. Possible reasons for the null results regarding prejudice were discussed. / System requirements: World Wide Web browser and PDF reader. / Mode of access: World Wide Web.

This dissertation considers some challenges to delivering effective and equitable health care to disadvantaged children and families in the United States. Chapter one examines whether expanded access to health insurance following the enactment of the Children’s Health Insurance Program (CHIP) in 1997 reduced the prevalence of economic hardships (food insecurity, problems affording housing) and postponed medical care. In difference-in-differences analysis, I find that relative to a comparison group of families that missed the eligibility cutoffs, families that gained eligibility under CHIP did not experience changes in food or housing problems, but were significantly less likely to postpone medical care. These findings suggest that while public insurance for families with children likely improves access to care, it does not significantly reduce other forms of hardship. Chapter two provides an ethical argument for subsidizing health insurance for low income families – a central component of the 2010 Affordable Care Act (ACA). I argue subsidies are a vehicle for promoting equality of opportunity: specifically, subsidies ensure access to specific “basic opportunities” (such as the ability to attend college) when out-of-pocket spending on insurance would have otherwise crowded out those opportunities. Subsidies thus make a modest, but important, contribution to mitigating the negative effect of health spending on social mobility and financial security, even if they fall short of comprehensive income protection. I raise and respond to some potential concerns about inequities created by this system, and conclude with implications for evaluating the subsidies under the ACA. Chapter three investigates whether diffusion of long-acting stimulants, a medication for Attention-Deficit/Hyperactivity Disorder (ADHD), narrowed racial/ethnic disparities among diagnosed children in the Florida Medicaid program. In longitudinal analysis, we found that minorities were substantially less likely than whites to use medications overall, but minority medication users were equally likely to switch to long-acting medications after market introduction. The increase in prescribed days was comparable for white and black medication users, but lower for Hispanics. Geography and provider setting helped explain overall medication utilization disparities, but adherence disparities were not explained by any of the covariates. We recommend targeting interventions to increase medication adherence to high-volume, minorityserving providers.

Humans show such strong sensitivity to whether resources are distributed fairly that they sacrifice personal gain to avoid distributional inequity. This inequity aversion plays an important role in guiding human social decision-making and appears to be ubiquitous across human populations. However, we currently do not understand whether or how inequity aversion evolved over the course of human evolution or how it develops in children. / Human Evolutionary Biology

As the number of women entering postsecondary education continues to increase (U.S. Bureau of Labor Statistics, 2014), universities will be tasked with ensuring that their pregnancy leave policies and practices are aligned with the principles of organizational justice. When organizations are aware of the perceptions of both decision makers and those affect by decisions, they are able to alter policies and practices in a way that promotes perceptions of fairness. The present study examines department head and faculty member perceptions of pregnancy leave practices in a university setting. This study is a replication/follow-up of two studies conducted in 2005 and 1995 on perceptions of pregnancy leave practices within a university setting. The results indicate that department heads and faculty members similarly perceive the fairness of options to cover a pregnant faculty member’s responsibilities. Department heads and faculty also rated their willingness to use an option similarly. Additionally, department heads are more willing to use options that they perceived as fair and are less likely to use options they perceived as unfair. The findings of this study indicate that it is important for those affected by decisions such as pregnancy leave practices to experience voice in the decision-making process. The results of this study should be useful to universities and department heads when determining how to cover the responsibilities of a faculty member on pregnancy leave.

Cognitive Radio Networks (CRNs) provide a solution for the spectrum scarcity problem facing the wireless communications community. However, due to the infancy of CRNs, further research is needed before we can truly benefit from CRNs. The basic concept of CRNs relies on utilizing the unused spectrum of a primary network, without interfering with the activity of primary users (PUs). In order to successfully achieve that, users in a CRN has to perform spectrum sensing, spectrum management, spectrum mobility, and spectrum sharing. The latter, which is the focus of our research, deals with how secondary users (SUs) share the unused spectrum. Furthermore, to be able to utilize CRNs in practical applications, a certain level of quality-of-service (QoS) should be guaranteed to SUs in such networks. QoS requirements vary according to the application. Interested in voice communications, we propose a packet scheduling scheme that orders the SUs' transmissions according to the packet dropping rate and the number of packets queued waiting for transmission. Two medium access control (MAC) layer protocols, based on the mentioned scheduling scheme, are proposed for a centralized CRN. In addition, the scheduling scheme is adapted for a distributed CRN, by introducing a feature that allows SUs to organize access to the available spectrum without the need for a central unit. Finally, extensive simulation based experiments are carried out to evaluate the proposed protocols and compare their performance with that of other MAC protocols designed for CRNs. These results reflect the effectiveness of our proposed protocols to guarantee the required QoS for voice packet transmission, while maintaining fairness among SUs in a CRN.

We investigate, in this thesis, the use of Hierarchical Modulation (HM), a physical layer technique that enables to exploit multiuser diversity, for resource allocation in OFDMA-based systems with and without use of relaying, so as to improve the system capacity. HM allows the sharing of the resources, namely subcarriers and power, between users of different radio conditions by sending an additional stream to a user with good radio conditions on a subcarrier that was initially allocated to carry an original stream to a user with lower radio conditions. And this, without affecting the original user's rate nor the total amount of power assigned to the shared subcarrier. In the literature, most of the works that consider the use of HM focus solely on the physical layer performance, notably in terms of the bit error rate. And this for a static user scenario,i.e., with a fixed number of users in the system, each with an infinite service duration. This configuration however does not reflect the real system behavior where the number of users is dynamic, i.e., the users come to the system at random time epochs and leave it after a finite duration, corresponding to the completion of their services. The study of the system at the flow-level, as opposed to the packet level, for a dynamic user configuration, enables us to investigate the realistic relationship between capacity and demand and to quantify several system-level performance metrics, such as mean transfer times and blocking rates, which are meaningful both to the user and the network operator/provider.

No description available.