Costs and benefits of superfast broadband in the UK

This paper was commissioned from LSE Enterprise by Convergys Smart Revenue Solutions to stimulate an open and constructive debate among the main stakeholders about the balance between the costs, the revenues, and the societal benefits of ‘superfast’ broadband. The intent has been to analyse the available facts and to propose wider perspectives on economic and social interactions. The paper has two parts: one concentrates on superfast broadband deployment and the associated economic and social implications (for the UK and its service providers), and the other considers alternative social science approaches to these implications. Both parts consider the potential contribution of smart solutions to superfast broadband provision and use. Whereas Part I takes the “national perspective” and the “service provider perspective”, which deal with the implications of superfast broadband for the UK and for service providers, Part II views matters in other ways, particularly by looking at how to realise values beyond the market economy, such as those inherent in neighbourliness, trust and democrac

A computational efficient modelling of laminar separation bubbles

In predicting the aerodynamic characteristics of airfoils operating at low Reynolds numbers, it is often important to account for the effects of laminar (transitional) separation bubbles. Previous approaches to the modelling of this viscous phenomenon range from fast but sometimes unreliable empirical correlations for the length of the bubble and the associated increase in momentum thickness, to more accurate but significantly slower displacement-thickness iteration methods employing inverse boundary-layer formulations in the separated regions. Since the penalty in computational time associated with the more general methods is unacceptable for airfoil design applications, use of an accurate yet computationally efficient model is highly desirable. To this end, a semi-empirical bubble model was developed and incorporated into the Eppler and Somers airfoil design and analysis program. The generality and the efficiency was achieved by successfully approximating the local viscous/inviscid interaction, the transition location, and the turbulent reattachment process within the framework of an integral boundary-layer method. Comparisons of the predicted aerodynamic characteristics with experimental measurements for several airfoils show excellent and consistent agreement for Reynolds numbers from 2,000,000 down to 100,000

A computationally efficient modelling of laminar separation bubbles

The goal is to accurately predict the characteristics of the laminar separation bubble and its effects on airfoil performance. Toward this end, a computational model of the separation bubble was developed and incorporated into the Eppler and Somers airfoil design and analysis program. Thus far, the focus of the research was limited to the development of a model which can accurately predict situations in which the interaction between the bubble and the inviscid velocity distribution is weak, the so-called short bubble. A summary of the research performed in the past nine months is presented. The bubble model in its present form is then described. Lastly, the performance of this model in predicting bubble characteristics is shown for a few cases

A computationally efficient modelling of laminar separation bubbles

In order to predict the aerodynamic characteristics of airfoils operating at low Reynolds numbers, it is necessary to accurately account for the effects of laminar (transitional) separation bubbles. Generally, the greatest difficulty comes about when attempting to determine the increase in profile drag that results from the presence of separation bubbles. While a number of empirically based separation bubble models have been introduced in the past, the majority assume that the bubble development is fully predictable from upstream conditions. One way of accounting for laminar separation bubbles in airfoil design is the bubble analog used in the design and analysis program of Eppler and Somers. A locally interactive separation bubble model was developed and incorporated into the Eppler and Somers program. Although unable to account for strong interactions such as the large reduction in suction peak sometimes caused by leading edge bubbles, it is able to predict the increase in drag and the local alteration of the airfoil pressure distribution that is caused by bubbles occurring in the operational range which is of most interest

Notes on the Exponential Random Graph Model: a contribution to the critique of interdisciplinarity

A tutorial discussion is presented about the Exponential Random Graph Model (ERGM) of Social Network Analysis (SNA). The intended audience is post-graduate students and researchers in social science who are curious to understand better where quantitative models come from, for a more effective integration with qualitative methodologies. The discussion is traced back to Jaynes’s distinction between objective and subjective interpretations of probability, where the former emphasizes likelihood of outcomes based on frequency distributions, while the latter emphasizes our incomplete knowledge or uncertainty about the outcome. Although within information theory both views lead to the same functional form for information entropy, when applying these concepts to graph theory the paper shows that the subjective view leads to the ERGM, while the objective view yields a different functional form for the ‘graph entropy’. It is hoped that the critical perspective on interdisciplinarity developed throughout the paper lends credibility and insight to the conclusion that the subjective view of graph entropy is justified as an optimization principle for the most likely distribution of different graph metrics

SolarStat: Modeling Photovoltaic Sources through Stochastic Markov Processes

In this paper, we present a methodology and a tool to derive simple but yet accurate stochastic Markov processes for the description of the energy scavenged by outdoor solar sources. In particular, we target photovoltaic panels with small form factors, as those exploited by embedded communication devices such as wireless sensor nodes or, concerning modern cellular system technology, by small-cells. Our models are especially useful for the theoretical investigation and the simulation of energetically self-sufficient communication systems including these devices. The Markov models that we derive in this paper are obtained from extensive solar radiation databases, that are widely available online. Basically, from hourly radiance patterns, we derive the corresponding amount of energy (current and voltage) that is accumulated over time, and we finally use it to represent the scavenged energy in terms of its relevant statistics. Toward this end, two clustering approaches for the raw radiance data are described and the resulting Markov models are compared against the empirical distributions. Our results indicate that Markov models with just two states provide a rough characterization of the real data traces. While these could be sufficiently accurate for certain applications, slightly increasing the number of states to, e.g., eight, allows the representation of the real energy inflow process with an excellent level of accuracy in terms of first and second order statistics. Our tool has been developed using Matlab(TM) and is available under the GPL license at[1].Comment: Submitted to IEEE EnergyCon 201

From complementary currency to institution: a micro-macro study of the Sardex mutual credit system

The remarkable growth of Sardex as a local currency throughout the island of Sardinia over the past 5 years motivated an in-depth look at its starting assumptions, design and operational principles, and local context. The paper looks at Sardex as a social innovation start-up, a complementary currency, a mutual credit system, and a socio-economic «circuit». The analysis relies on interviews of circuit members and its founders. The main findings are that trust was and continues to be fundamentally important for the creation and operation of the mutual credit system, and that Sardex encompasses both economic and social value(s) in a process of re-embedding of the economy. Sardex configured itself as a crucial mediator of economic exchanges and became a valuable actor acting as an institution at the regional level. These properties make it an ideal space for experimentation in socio-economic innovation that can be characterized as a «laboratory for multi-level governance»

Community currencies as laboratories of institutional learning: emergence of governance through the mediation of social value

This paper is motivated by a long-standing curiosity about the role of scale in explanatory theories of socio-economic action. Introducing scale as an analytical variable implies the coexistence of individuals alongside institutions. We make the case that economic activity becomes more sustainable when it is ‘colonized’ by ‘social value’ whereby market activity is complemented with community and democratic values, by which we mean the opposite of the commodification of e.g. social networks analytics. We take the Sardex mutual credit system as an empirical context from which to begin exploring the extent to which such community-based economic practices offer a democratic and social alternative to, a questionable substitute for, or a functional supplement to the capitalist market, the welfare state, and public enterprises administered by state bureaucracies. We broach critically the emergence of institutional collective structures from the perspective of social constructivism, post- anarchist theory, economic anthropology, and post-capitalist studies of economic action. In particular, we focus on how Graeber’s ideas on the history of debt apply to these points. We propose a recursive constructive framework for socio-economic action whereby money as a social construction is itself a medium of economic construction and, as such, becomes an important lever subject to “design” inputs by socio-economic stakeholders engaged in the development of an inclusive and participatory governance process of institution construction