• A data dependency recovery system for a heterogeneous multicore processor

      Hill, Richard; Bagdasar, Ovidiu; Jones, Clifton; Kainth, Haresh S. (University of Derby, 2014-01-29)
      Multicore processors often increase the performance of applications. However, with their deeper pipelining, they have proven increasingly difficult to improve. In an attempt to deliver enhanced performance at lower power requirements, semiconductor microprocessor manufacturers have progressively utilised chip-multicore processors. Existing research has utilised a very common technique known as thread-level speculation. This technique attempts to compute results before the actual result is known. However, thread-level speculation impacts operation latency, circuit timing, confounds data cache behaviour and code generation in the compiler. We describe an software framework codenamed Lyuba that handles low-level data hazards and automatically recovers the application from data hazards without programmer and speculation intervention for an asymmetric chip-multicore processor. The problem of determining correct execution of multiple threads when data hazards occur on conventional symmetrical chip-multicore processors is a significant and on-going challenge. However, there has been very little focus on the use of asymmetrical (heterogeneous) processors with applications that have complex data dependencies. The purpose of this thesis is to: (i) define the development of a software framework for an asymmetric (heterogeneous) chip-multicore processor; (ii) present an optimal software control of hardware for distributed processing and recovery from violations;(iii) provides performance results of five applications using three datasets. Applications with a small dataset showed an improvement of 17% and a larger dataset showed an improvement of 16% giving overall 11% improvement in performance.
    • E-government iImplementation and adoption: the case study of Botswana Government

      Antonopoulos, Nikolaos; Horton, Keith; Moatshe, Racious M. (University of Derby, 2014-10-28)
      ABSTRACT The advancements in the ICT and internet technologies challenge governments to engage in the electronic transformation of public services and information provision to citizens. The capability to reach citizens in the physical world via e-government platform and render a citizen-centric public sector has increasingly become vital. Thus, spending more resources to promote and ensure that all members of society are included in the entire spectrum of information society and more actively access government online is a critical aspect in establishing a successful e-government project. Every e-government programme requires a clear idea of the proposed benefits to citizens, the challenges to overcome and the level of institutional reform that has to take place for e- government to be a success in a given context. E-government strategy is fundamental to transforming and modernising the public sector through identification of key influential elements or strategy factors and ways of interacting with citizens. It is therefore apparent that governments must first understand variables that influence citizens’ adoption of e-government in order to take them into account when developing and delivering services online. Botswana has recently embarked on e-government implementation initiatives that started with the e-readiness assessment conducted in 2004, followed by enactment of the National ICT policy of 2007 and the approval of the e-government strategy approved in 2012 for dedicated implementation in the 2014 financial year. Significant developments have taken place around national and international connectivity including initiatives that offer connectivity to citizens such as the I- partnership, community run Nteletsa projects, post office run tele-centres and Sesigo projects that have been deployed on a wider Botswana. In spite of these remarkable initiatives there is no change management strategy in place and evidence to suggest that citizens cluster groups, government employees, key influential citizens’ stakeholders and other local government administrative governing structures at district levels have been appropriately informed, consulted, engaged and participated in the design, development and implementation initiatives. This position has contributed largely to low e-readiness indices for Botswana, low PC, Internet and broadband penetration levels, which do not commensurate with levels of connectivity initiatives already in place and operational. The strategy development, which is the viability business plan for the entire project has been initiated and concluded without the appropriate input of citizens, employees and local government structures at the districts. Considering that that e-government is new and narrowly researched in Botswana. There is non existing research on both the impact of strategy factors to e-government implementation success and citizens’ involvement and participation in the e-government design and implementation through to adoption and continual use. This study therefore explores and investigates empirically the key e-government strategy influential success elements and the how citizens’ involvement and participation in e-government development can be secured, supported and facilitated towards adoption and continual future use. This culminates in the proposal of both theoretically supported and empirically validated e-government strategy framework and citizen centric conceptual model. The study is crucial as it aims understand how can influences upon success in e-government project be better understood and citizens’ stakeholder adoption of e-government enhanced to facilitate successful development of e-government in Botswana and is also timely as it comes at the time when Botswana has not yet implemented her e-government strategy, hence factors identified are critical to both strategy re-alignment and design of the citizens’ involvement and participation change management strategy to support both implementation and citizens’ adoption of e-government in Botswana. The study utilises the mixed methods research, employing both qualitative and quantitative methods to address the research question and triangulated data collection approaches used to select survey sample for two questionnaire sets carried on opinion holders within government and non government structures and ordinary citizens, use of observations on operating tele-centres, interviews with key e-government strategic stakeholders and document analysis which included e-government policies and related documentations as well as extensive review of e-government published literature including applied implementation and citizens adoption experiences of developing and developed countries. In the analysis of data the multiple regression analysis has been utilised and multivariate analysis performed to ensure linearity, normality and collinearity. The linear regression has been used to test the hypothesis through the Analysis of variance (ANOVA) technique. Keywords E-government, strategy critical success factors, key influential elements, citizen centric conceptual model, strategy framework, Botswana.
    • The effect of productivity on profitability

      Theriou, Nikolaos G. (University of Derby, 2000)
    • Exploring determinants of entrepreneurial performance

      Dakin, John; Thompson, Roy H. (University of Derby, 2013-02-11)
      This thesis reports research into elements of entrepreneurial performance with a particular focus on gender differences and their determinants. Inductive research during the initial literature review uncovered a range of factors affecting performance leading to an investigation of smallholder dairy entrepreneurs in Central Malawi. The primary research utilised a mix of both quantitative and qualitative instruments including innovative use of an adaptation of the ‘circle and stones’ proportional piling instrument. This participatory technique explored changes in the household economy following the introduction of the dairy enterprise, including projecting entrepreneurial intentions into the future. A notable feature of the research was the use of a range of context-specific performance measures developed from an outcomes model. These were both separately applied in a performance ranking exercise, and compiled into an overall performance rating (OPR) which was then compared with the initial post-interview field performance rating (FPR). The research involved extensive use of internal and external triangulation of information sources, comparing results from different instruments in the field research, and situating and comparing primary research findings with those from the academic literature and analysis of secondary data. Despite controlling for factors including industry-type, size of enterprise, provision of business and extension support, and taking into account differences in age and educational background, the research uncovered gender disparities in entrepreneurial performance. The performance disparity was greater for those females who are the de facto head of their households, and lesser for those who have the support of a resident male partner. The finding of female underperformance runs contrary to the a priori expectation of industry key informants in Malawi, and much of the academic literature. The research included exploration of risk mitigation strategies and their potential effect on entrepreneurial performance, as possible explanatory factors. Follow-on fieldwork then sought alternative explanations for the gender differentials through focus group discussions and key informant interviews, which uncovered time constraints of females as a potential factor in underperformance. Future research direction indicated includes an in-depth exploration of the intra-household dynamics of time allocation in managing enterprises.
    • Handling cultural factors in human-computer interaction

      Bourges-Waldegg, Paula (University of Derby, 1998)
    • The Inter-cloud meta-scheduling

      Bessis, Nik; Antonopoulos, Nikolaos; Sotiriadis, Stelios (University of DerbySchool of Computing and Mathematics, 2013-07-09)
      Inter-cloud is a recently emerging approach that expands cloud elasticity. By facilitating an adaptable setting, it purposes at the realization of a scalable resource provisioning that enables a diversity of cloud user requirements to be handled efficiently. This study’s contribution is in the inter-cloud performance optimization of job executions using metascheduling concepts. This includes the development of the inter-cloud meta-scheduling (ICMS) framework, the ICMS optimal schemes and the SimIC toolkit. The ICMS model is an architectural strategy for managing and scheduling user services in virtualized dynamically inter-linked clouds. This is achieved by the development of a model that includes a set of algorithms, namely the Service-Request, Service-Distribution, Service-Availability and Service-Allocation algorithms. These along with resource management optimal schemes offer the novel functionalities of the ICMS where the message exchanging implements the job distributions method, the VM deployment offers the VM management features and the local resource management system details the management of the local cloud schedulers. The generated system offers great flexibility by facilitating a lightweight resource management methodology while at the same time handling the heterogeneity of different clouds through advanced service level agreement coordination. Experimental results are productive as the proposed ICMS model achieves enhancement of the performance of service distribution for a variety of criteria such as service execution times, makespan, turnaround times, utilization levels and energy consumption rates for various inter-cloud entities, e.g. users, hosts and VMs. For example, ICMS optimizes the performance of a non-meta-brokering inter-cloud by 3%, while ICMS with full optimal schemes achieves 9% optimization for the same configurations. The whole experimental platform is implemented into the inter-cloud Simulation toolkit (SimIC) developed by the author, which is a discrete event simulation framework.
    • Knowledge and discourse matters

      Longbottom, David; Self, Richard; Crane, Lesley (University of DerbyFaculty of Business, Law and ComputingJ Wiley & Sons, 2015-05-19)
      This work draws on the discipline of Discursive Psychology for a theory of language, shown to be all but absent in the organizational knowledge management literature, and a methodology for the study of discourse. Organizational knowledge sharing is selected as the topic of primary research for its accessibility to analysis, and because it is considered to be an underpinning action to new knowledge creation. The research approaches discourse as action-orientated and locally situated, as constructed and constructive, with function and consequence for speakers. Indicative research questions are concerned with the discursively accomplished phenomena of trust, risk, identity and context, how these are accomplished in rhetorical interaction and with what effect on organizationally situated knowledge sharing. Recordings of organizations’ everyday knowledge sharing meetings, as well as an online discussion forum, are analysed focusing on these four themes. Findings show them to be accomplished as speakers’ live concerns in knowledge sharing talk. It is claimed that trust, risk and identity, as contexts displayed and oriented to by speakers themselves, are tacitly and collaboratively accomplished actions, shown to be co-relational and influential to knowledge sharing scope and directions. A further claim is that the analysis of discourse for what contexts in general speakers invoke displays speakers’ orienting to trust, risk and identity. Limitations of the present study are discussed, along with speculated implications for knowledge management and future directions for research. This work aims to contribute to the field of knowledge management in three ways. First, in extending the directions that some scholars and practitioners are already indicating through focusing the interest of study on organizational discourse. Secondly, the study seeks to understand how tacit knowing, as a phenomenon invoked by speakers themselves, is accomplished and how it influences the scope and directions of knowledge sharing actions, and with what effect. Finally, it is claimed that the research provides some support for those theorists in the knowledge management field who promote the knowing how-knowing that formulation, and those who are critical of conventional knowledge management’s heavy reliance on technology to deliver its objectives.
    • Mangement control systems and management accounting varieties

      Angelakis, George (University of Derby, 2009)