3D simulation of complex shading affecting PV systems taking benefit from the power of graphics cards developed for the video game industry

Shading reduces the power output of a photovoltaic (PV) system. The design engineering of PV systems requires modeling and evaluating shading losses. Some PV systems are affected by complex shading scenes whose resulting PV energy losses are very difficult to evaluate with current modeling tools. Several specialized PV design and simulation software include the possibility to evaluate shading losses. They generally possess a Graphical User Interface (GUI) through which the user can draw a 3D shading scene, and then evaluate its corresponding PV energy losses. The complexity of the objects that these tools can handle is relatively limited. We have created a software solution, 3DPV, which allows evaluating the energy losses induced by complex 3D scenes on PV generators. The 3D objects can be imported from specialized 3D modeling software or from a 3D object library. The shadows cast by this 3D scene on the PV generator are then directly evaluated from the Graphics Processing Unit (GPU). Thanks to the recent development of GPUs for the video game industry, the shadows can be evaluated with a very high spatial resolution that reaches well beyond the PV cell level, in very short calculation times. A PV simulation model then translates the geometrical shading into PV energy output losses. 3DPV has been implemented using WebGL, which allows it to run directly from a Web browser, without requiring any local installation from the user. This also allows taken full benefits from the information already available from Internet, such as the 3D object libraries. This contribution describes, step by step, the method that allows 3DPV to evaluate the PV energy losses caused by complex shading. We then illustrate the results of this methodology to several application cases that are encountered in the world of PV systems design. Keywords: 3D, modeling, simulation, GPU, shading, losses, shadow mapping, solar, photovoltaic, PV, WebGL

A control theoretic approach to solve a constrained uplink power dynamic game

This paper addresses an uplink power control dynamic game where we assume that each user battery represents the system state that changes with time following a discrete-time version of a differential game. To overcome the complexity of the analysis of a dynamic game approach we focus on the concept of Dynamic Potential Games showing that the game can be solved as an equivalent Multivariate Optimum Control Problem. The solution of this problem is quite interesting because different users split the activity in time, avoiding higher interferences and providing a long term fairness.

Hybridization Processes: The case of the urban game: Hybrid Hunt: Petrified

The proposal highlights certain design strategies and a case study that can link the material urban space to digital emerging realms. The composite nature of urban spaces ?material/ digital- is understood as an opportunity to reconfigure public urban spaces without high-cost, difficult to apply interventions and, furthermore, to reactivate them by inserting dynamic, interactive and playful conditions that engage people and re-establish their relations to the cities. The structuring of coexisting and interconnected material and digital aspects in public urban spaces is proposed through the implementation of hybridization processes. Hybrid spaces can fascinate and provoke the public and especially younger people to get involved and interact with physical aspects of urban public spaces as well as digital representations or interpretations of those. Digital game?s design in urban public spaces can be comprehended as a tool that allows architects to understand and to configure hybrids of material and digital conceptions and project all in one, as an inseparable totality. Digital technologies have for a long time now intervened in our perception of traditional dipoles such as subject - environment. Architects, especially in the past, have been responsible for material mediations and tangible interfaces that permit subjects to relate to their physical environments in a controlled and regulated manner; but, nowadays, architects are compelled to embody in design, the transition that is happening in all aspects of everyday life, that is, from material to digital realities. In addition, the disjunctive relation of material and digital realms is ceding and architects are now faced with the challenge that supposes the merging of both in a single, all-inclusive reality. The case study is a design project for a game implemented simultaneously in a specific urban space and on the internet. This project developed as the spring semester course New Media in Architecture at the Department of Architecture, Democritus University of Thrace, Greece is situated at the city of Xanthi. Composite cities can use design strategies and technological tools to configure augmented and appealing urban spaces that articulate and connect different realms in a single engaging reality.

Stochastic game theory: For playing games, not just for doing theory

Recent theoretical advances have dramatically increased the relevance of game theory for predicting human behavior in interactive situations. By relaxing the classical assumptions of perfect rationality and perfect foresight, we obtain much improved explanations of initial decisions, dynamic patterns of learning and adjustment, and equilibrium steady-state distributions.

Mathematics Game e-Library for Elementary School, study case: Mexico

One of the most relevant subjects for the intellectual formation of elementary school students is Mathematics where its importance goes back to ancient civilizations and which its importance is underestimated nowadays. This phenomenon occurs in Mexico, where 63.1% of the total population of elementary school students between the third and sixth grade have insufficient/elemental level of mathematics knowledge. This has resulted in the need to use a new mechanism to complement student’s classroom learning. With the rapid growth of wireless and mobile technologies, the mobile learning has been gradually considered as a novel and effective form of learning due to it inherits all the advantages of e-learning as well as breaks the limitations of learning time and space occurring in the traditional classroom teaching. This project proposes the use of a Mathematics Game e-Library integrated by a set of games for mobile devices and a distribution/management tool. The games are developed for running on mobile devices and for cover the six competencies related with the mathematics learning approach established in Mexico. The distribution/management tool allows students to reach contents according to their needs; this is achieved through a core engine that infers, from an initial profile, the games that cover the user’s knowledge gaps.

Play the game or get played? Researchers’ strategies around R&D policies

This chapter focuses on possible effects of current R&D policies in the scientific work, exploring some of the dilemmas they cause to researchers. In a transnational scale, R&D policies embrace performance-based research funding systems, calling for a growing accountability and a more useful and published research. Often justified by the importance of knowledge in public policies or as part of the new managerialism regime, these trends emphasize performativity on research. In this scenario, how researchers receive and interpret R&D policies is influenced according to their values and interests? Do they play the game or do they get played by it? These questions rely on a conceptual framework that conceives the research as a political scene, where researchers and R&D policies meet. Moreover, researchers’ strategies are perceived as political, considering that it is in the context of the practices that policy is interpreted and reinvented. The chapter presents an empirical study conducted in Portugal, which will be taken as an example of what Waitere et al (2011) already named as “choosing whether to resist or reinforce” R&D policies. In fact, the study revealed a strategic calculation made by researchers and the coexistence of convergent and divergent strategies concerning R&D policies. I will argue that the tensions in this strategic game are both a reflex and generator of the dilemmas of scientific work today and a sign of the complexity of public policies.

A flexible, scaleable approach to the international patent 'name game'. Bruegel Working Paper 2014/10i, September 2014

The inventors in PATSTAT are often duplicates: the same person or company may be split into multiple entries in PATSTAT, each associated to different patents. In this paper, we address this problem with an algorithm that efficiently de-duplicates the data. It needs minimal manual input and works well even on consumer-grade computers. Comparisons between entries are not limited to their names, and thus this algorithm is an improvement over earlier ones that required extensive manual work or overly cautious clean-up of the names.

Patriarch Kirill's game over Ukraine. OSW Commentary No. 144, 14.08.2014

The protests on Kyiv’s Maidan which commenced in November 2013, followed by the conflict in Ukraine’s eastern regions, have redefined the political and social relations between Russia and Ukraine, and have added complexity to the dependences between the Orthodox Churches operating in the two countries. The Kremlin’s policy has put the Russian Orthodox Church–Moscow Patriarchate (ROC) in an awkward position. The ROC is Russia’s largest religious organisation, which also exercises symbolic sovereignty over Ukraine’s most numerous Orthodox community, the Ukrainian Orthodox Church–Moscow Patriarchate (UOC–MP), which since 13 August has had a new leader, Metropolitan Onufry. The head of the ROC, the Patriarch of Moscow and All-Russia, Kirill, has been facing a dilemma as to how he should respond to the Russian government’s aggressive policy towards Ukraine. His firm support of the Kremlin’s moves in Ukraine, may lose the Russian Church its social influence in this country. This might also catalyse a process within which Ukraine’s largest Orthodox Church would gradually become independent of Moscow. On the other hand, if he condemns the Kremlin’s policy, this would adversely affect the co-operation between ‘the altar and the throne’ which has been rapidly developing over the past few years in Russia, and which has offered multiple benefits to the Russian Church. As a result, Patriarch Kirill has distanced the ROC from the recent developments in Ukraine and has adopted a neutral stance. However, Kirill’s choice has aggravated the negative perception of the ROC among the Orthodox community in Ukraine. Given its close relations with the Kremlin, the ROC is increasingly viewed there as an instrument of political struggle and an exponent of the Russian government’s interests. The ROC’s stance has cast the UOC–MP, which has links with the Russian Church, in an unfavourable light, and has fostered its efforts to become more independent from the Moscow Patriarchate. Regardless of how the situation evolves, the recent developments in Ukraine have made it clear that the interests of the Russian Church and the Kremlin, which have coincided for years, now come into conflict, mainly due to the disagreement over the methods used. Despite this, the Russian Church is not withdrawing from the cooperation of ‘the altar and the throne’, and submits itself to the Kremlin’s decisions.

The Great Game around Turkmenistan. OSW Point of View, August 2008

The rise of a new leader of the state of Turkmenistan – President Gurbanguly Berdymukhammedov, who became ruler of the central Asian state after the 21-year rule of Saparmurad Niyazov, the self-proclaimed Turkmenbashi, who died on December 21, 2006 – has initiated changes in Turkmenistan’s political life. The new president has broken with the previous policy of self-isolation, and has directed the country towards openness to the outside world. Opportunities have thereby arisen for competitors in the ‘Great Game’, to gain political influence in Turkmenistan and access to hitherto unexploited Turkmen deposits of gas and oil. A new stage in the Great Game, which has been played for influence in Central Asia and control of access to its energy resources for many years, can thus be said to have been launched, and Turkmenistan has become the main setting for it. The major actors involved are Russia, the United States, China and the European Union.

Jihad vs The New Great Game: Paradoxes of militant Islamic threats in Central Asia. OSW Point of View (Policy Brief), January 2010

Threats linked to Islamic fundamentalism have been hanging over Central Asia for almost two decades. Many believe that militant Islam has played a significant part in each major political crisis in the region, and Central Asia is perceived as an almost perfect environment for its further development. Such a picture of this region is a result of serious abuses and manipulations. The real threat posed by militant Islam seems to be rather limited, and its roots lie outside Central Asia. This region is unlikely to become a key front of global jihad. Nevertheless, this does not guarantee peace and safety in Central Asia, as the Islamic threat remains an element of the geopolitical rivalry in the region – the ‘New Great Game’.

EU Sanctions Policy towards Russia: The Sanctioner-Sanctionee’s Game of Thrones. CEPS Working Document No. 402/January 2015

Since Russia’s annexation of the Crimean peninsula and the start of the conflict in the Donbass region, the EU has introduced three waves of restrictive measures against Russia, which are regularly updated. Having thus expanded from measures targeting individuals to entire sectors, the current EU sanctions policy impacts Russia’s financial markets, energy sector and defence industry. On top of this, new bans affect EU investments, services and trade in Crimea and Sevastopol. While they hurt the Russian economy, the EU sanctions also have a boomerang effect, especially in conjunction with the countersanctions imposed by the Kremlin on EU food imports. In this lose-lose situation, the usefulness of the EU sanctions has been called into doubt, in particular in those EU member states that are the most economically intertwined with Russia. How successful has the EU been so far in pushing its case with the Kremlin and what moves are left for the two main actors in the sanctioner-sanctionee ‘Game of Thrones’? This Working Document offers a SWOT analysis of the EU sanctions policy towards Russia and identifies the Strengths for the EU to cultivate, Weaknesses to minimise, Opportunities to seize and Threats to counteract.

Game of zones. The quest for influence in Europe’s neighbourhood. Egmont Paper No. 67, June 2014

Introduction. Russia’s annexation of the Crimea and subsequent meddling in Ukraine does not constitute a game-changer. It is just a reminder that at least since the war with Georgia in 2008 Russia has been and still is playing the same game: a “game of zones”, aimed at (re)establishing an exclusive sphere of influence. Many of us Europeans had forgotten that, or had pushed it to the back of our minds, preferring to believe that we were not engaged in a zero-sum game in our eastern neighbourhood. While we were dealing with Ukraine, we tended also to forget the crises still going on in our southern neighbourhood, in Libya, Mali, Syria and now Iraq. Spilling over from Syria, extremist militias may establish their own “zone” in the Middle East, which would de-stabilize the entire region. In order to prevent that game-changer from materializing, another game-changer may be necessary: a rapprochement with Iran. Europe must assume responsibility for security in its entire neighbourhood, both east and south. The challenge is great – but so are Europe’s means.

Michigan Stadium Dedication Game, 1927

Ivory 5x7 AND 8x10 inch negatives; print inscribed verso: "Mich 21 / Ohio State 0 / dedication game 1927...and Ivory Photo was there"

Lloyd Carr, UM football coach, 1998 Rose Bowl game, post-game celebration

[Carr and Rob Swett (#44) celebrating Rose Bowl Victory]