Consolidation assessment using Multi Expression Programming

© 2019 Elsevier B.V. In this study, new approximate solutions for consolidation have been developed in order to hasten the calculations. These solutions include two groups of equations, one can be used to calculate the average degree of consolidation and the other one for computing the time factor (inverse functions). Considering the complicated nature of consolidation, an evolutionary computation technique called Multi-Expression Programming was applied to generate several non-piecewise models which are accurate and straightforward enough for different purposes for calculating the degree of consolidation for each depth and its average as well for the whole soil layer. The parametric study was also performed to investigate the impact of each input parameter on the predicted consolidation degree of developed models for each depth. Moreover, the results of the consolidation test carried out on four different clays attained from the literature showed the proper performance of the proposed models

Applying revenue management to agent-based transportation planning

We consider a multi-company, less-than-truckload, dynamic VRP based on the concept of multi-agent systems. We focus on the intelligence of one vehicle agent and especially on its bidding strategy. We address the problem how to price loads that are offered in real-time such that available capacity is used in the most profitable way taking into account possible future revenues. We develop methods to price loads dynamically based on revenue management concepts.\ud We consider a one leg problem, i.e., a vehicle travels from i to j and can wait at most τ time units in which it can get additional loads from i to j. We develop a DP to price loads given a certain amount of remaining capacity and an expected number of auctions in the time-to-go. Because a DP might be impractical if parameters change frequently and bids has to be determined in real-time, we derived two approximations to speed up calculations. The performance of these approximations are compared with the performance of the DP. Besides we introduce a new measure to calculate the average vehicle utilisation in consolidated shipments. This measure can be calculated based on a limited amount of data and gives an indication of the efficiency of schedules and the performance of vehicles

WormBase: a multi-species resource for nematode biology and genomics

WormBase (http://www.wormbase.org/) is the central data repository for information about Caenorhabditis elegans and related nematodes. As a model organism database, WormBase extends beyond the genomic sequence, integrating experimental results with extensively annotated views of the genome. The WormBase Consortium continues to expand the biological scope and utility of WormBase with the inclusion of large-scale genomic analyses, through active data and literature curation, through new analysis and visualization tools, and through refinement of the user interface. Over the past year, the nearly complete genomic sequence and comparative analyses of the closely related species Caenorhabditis briggsae have been integrated into WormBase, including gene predictions, ortholog assignments and a new synteny viewer to display the relationships between the two species. Extensive site-wide refinement of the user interface now provides quick access to the most frequently accessed resources and a consistent browsing experience across the site. Unified single-page views now provide complete summaries of commonly accessed entries like genes. These advances continue to increase the utility of WormBase for C.elegans researchers, as well as for those researchers exploring problems in functional and comparative genomics in the context of a powerful genetic system

Energy-based numerical models for assessment of soil liquefaction

AbstractThis study presents promising variants of genetic programming (GP), namely linear genetic programming (LGP) and multi expression programming (MEP) to evaluate the liquefaction resistance of sandy soils. Generalized LGP and MEP-based relationships were developed between the strain energy density required to trigger liquefaction (capacity energy) and the factors affecting the liquefaction characteristics of sands. The correlations were established based on well established and widely dispersed experimental results obtained from the literature. To verify the applicability of the derived models, they were employed to estimate the capacity energy values of parts of the test results that were not included in the analysis. The external validation of the models was verified using statistical criteria recommended by researchers. Sensitivity and parametric analyses were performed for further verification of the correlations. The results indicate that the proposed correlations are effectively capable of capturing the liquefaction resistance of a number of sandy soils. The developed correlations provide a significantly better prediction performance than the models found in the literature. Furthermore, the best LGP and MEP models perform superior than the optimal traditional GP model. The verification phases confirm the efficiency of the derived correlations for their general application to the assessment of the strain energy at the onset of liquefaction

Information technology team projects in higher education: an international viewpoint

It is common to find final or near final year undergraduate Information Technology students undertaking a substantial development project; a project where the students have the opportunity to be fully involved in the analysis, design, and development of an information technology service or product. This involvement has been catalyzed and prepared for during their previous studies where the students have been told and shown how to develop similar systems. It is the belief that only through this ‘real’ project do they get the chance to experience something similar to what is expected of them when they embark on their chosen profession; that is, as an information technology professional. The high value of ‘near real life’ educational experience is recognized by many universities across the globe. The aim of this paper is to present examples from three countries - Australia, United Kingdom and South Africa, of the delivery of these team, capstone or industrial experience projects; their curricula and management processes. Academics from institutions in each of the countries share experiences, challenges and pitfalls encountered during the delivery of these information technology projects within their institutions. An overview of each institution’s strategies is provided and highlights specific issues such as the selection of projects, allocation of teams to projects, legal requirements, assessment methods, challenges and benefits. The pedagogies presented here are not exhaustive; however, the three institutions do have in common the implementation of a combination of constructivism with a community of practice approach in delivering the project unit. The three universities recognize the need for industrial experience and learning of applied skills, and therefore make these projects a compulsory part of the curriculum. The projects tend to be real life business problems which are solved over a period of two semesters, and in the case of Cape Town it could be two consecutive years of two semesters each. These projects tend to involve practical development (for example databases and web sites). The process of project-to-team allocation is generally similar in all cases. Despite their differences, team work related problems are quite similar in all three cases presented, and seem to appear as a result of team work complexity, and the number of stakeholders involved. The intention of this paper is not to propose solutions to these problems (as these would be context dependent), but to draw the attention to the main problem categories for similar schemes, these are; • project selection, • management of students, • management of academic staff, • student team motivation, • equality and diversity, • passengers, and • assessment. Furthermore, it is not the intention of the authors to portray one approach as better than another, however, the approaches are representative of how team projects are being delivered across the globe, and in particular, in the contributing institutions. It is hoped that the assimilation and dissemination of information regarding the various approaches presented will nurture further discussion, and open communication across the globe with the view to enhancing the teaching and learning experience of such projects

Democratic Development and the Role of Citizenship Education in Sub-Saharan African with a Case Focus on Zambia

In addressing issues related to problems of democratisation in Africa, this paper attempts to relate the issue to the need for citizenship education and the role that can play in social development. Citizenship should be central to the formation of viable civil societies that claim a tangible stake in national public spaces in post-Cold War Africa. These and related topics are discussed relative to new possibilities that could lead to the full realisation of the concept as well as the practice of enfranchised citizenship and inclusive social development in aspiring democracies in the Sub Saharan African context. The complexity of the development ‘problematique’ that Sub-Saharan Africa is facing is unique in that it is multi-dimensional, but above all else, politically located. It is, therefore, central to our discussions here that to correct the continent’s current schemes of underdevelopment, pragmatic schemes of governance must be achieved. To do that, we are suggesting, new possibilities of citizenship education should be formulated for the general African scene in general, and for democratising but still both institutionally and economically weakened Zambia

BUSINESS MODELS IN TWO-SIDED MARKETS: AN ASSESSMENT OF STRATEGIES FOR APP PLATFORMS

„App platforms” are electronic software distribution markets for mobile devices like smartphones or tablets. They have gained popularity after Apple launched its AppStore in 2008. Since then, app platforms have transformed the entire mobile communication industry including mobile network operators, device producers, software suppliers, content providers, advertisers, etc. Platforms (like AppStore) that intermediate between two distinct groups of customers connected through indirect network effects can be analyzed effectively using the theory of two-sided markets. The interdependencies of customers, platforms and developers require consideration of strategic issues not present in traditional models. These issues may pertain to all development phases, including platform design, launch and competition and thus, have an effect on existing and new business models in this sector. Economics literature on two-sided markets focuses on theoretical analysis, paying not much attention to managerial implications. Strategic management literature, on the other hand, rather provides practical guidelines. Within this paper, we discuss strategic issues arising in the app platform industry, combining these streams of literature. Based on a thorough analysis of the key stakeholders in the app platform industry (platform owner, developers, and users), we use our findings to provide management recommendations and discuss probable evolutions of the industry