TRAVERSING NEWS WITH ANT COLONY OPTIMISATION & NEGATIVE PHEROMONES

The past decade has seen the rapid development of the online newsroom. News published online are the main outlet of news surpassing traditional printed newspapers. This poses challenges to the production and to the consumption of those news. With those many sources of information available it is important to find ways to cluster and organise the documents if one wants to understand this new system. Traditional approaches to the problem of clustering documents usually embed the documents in a suitable similarity space. Previous studies have reported on the impact of the similarity measures used for clustering of textual corpora. These similarity measures usually are calculated for bag of words representations of the documents. This makes the final document-word matrix high dimensional. Feature vectors with more than 10,000 dimensions are common and algorithms have severe problems with the high dimensionality of the data. A novel bio inspired approach to the problem of traversing the news is presented. It finds Hamiltonian cycles over documents published by the newspaper The Guardian. A Second Order Swarm Intelligence algorithm based on Ant Colony Optimisation was developed that uses a negative pheromone to mark unrewarding paths with a “no-entry” signal. This approach follows recent findings of negative pheromone usage in real ants . In this case study the corpus of data is represented as a bipartite relation between documents and keywords entered by the journalists to characterise the news. A new similarity measure between documents is presented based on the Q- analysis description of the simplicial complex formed between documents and keywords. The eccentricity between documents (two simplicies) is then used as a novel measure of similarity between documents. The results prove that the Second Order Swarm Intelligence algorithm performs better in benchmark problems of the travelling salesman problem, with faster convergence and optimal results. The addition of the negative pheromone as a non-entry signal clearly improved the quality of the solutions. The application of the algorithm to the corpus of news of The Guardian creates a coherent navigation system among the news. This allows the users to navigate the news published during a certain period of time in a semantic sequence instead of a time sequence. This work as broader application as it can be applied to many cases where the data is mapped to bipartite relations (e.g. protein expressions in cells, sentiment analysis, brand awareness in social media, routing problems), as it highlights the connectivity of the underlying complex system.

  2014/09/23 8:52 AM

Peer Assessment in Architecture Education

Peer Assessment in Architecture Education – Brno – ICTPI'14 – Mafalda Teixeira de Sampayo, David Sousa-Rodrigues, Cristian Jimenez-Romero, and Jeffrey Johnson

The role of peer assessment in education has become of particular interest in recent years, mainly because of its potential benefits in improving student’s learning and benefits in time management by allowing teachers and tutors to use their time more efficiently to get the results of student’s assessments quicker. Peer assessment has also relevant in the context of distance learning and massive open online courses (MOOCs).

The discipline of architecture is dominated by an artistic language that has its own way of being discussed and applied. The architecture project analysis and criticism goes beyond the technical components and programme requirements that need to be fulfilled. Dominating the architecture language is an essential tool in the architect’s toolbox. In this context peer assessment activities can help them develop skills early in their undergraduate education.

In this work we show how peer assessment acts as a formative activity in architecture teaching. Peer assessment leads the students to develop critical and higher order thinking processes that are fundamental for the analysis of architecture projects. The applicability of this strategy to massive open online education systems has to be considered as the heterogeneous and unsupervised environment requires confidence in the usefulness of this approach. To study this we designed a local experiment to investigate the role of peer experiment in architecture teaching.

This experiment showed that students reacted positively to the peer assessment exercise and looked forward to participating when it was announced. Previously to the assessment students felt engaged by the responsibility of marking their colleagues. Subsequently to the first iteration of the peer assessment, professors registered that students used elements of the qualitative assessment in their architecture discourse, and tried to answer the criticisms pointed to their projects by their colleagues. This led their work in directions some hadn’t considered before.

The marks awarded by the students are in good agreement with the final scores awarded by the professors. Only in 5 cases the average score of the peer assessment differed more than 10% from marks given by the professors. It was also observed that the professor’s marks where slightly higher than the average of the peer marking. No correlation was observed between the marks given by a student as marker and the final score given to that student by the professors.

The data produced in this experiment shows peer assessment as a feedback mechanism in the construction of a critical thought process and in the development of an architectural discourse. Also it shows that students tend to mark their colleagues with great accuracy. Both of these results are of great importance for possible application of peer assessment strategies to massive open online courses and distance education.

  2014/09/13 10:03 AM

As Notas de Entrada em Arquitectura

Todos os anos chega esta altura e começa a discussão de quem é o melhor na angariação de alunos para os respectivos cursos de ensino de Arquitectura. Normalmente os jornais mostram apenas as notas dos últimos classificados e aí estala a discussão. A única forma de saber quem conseguiu atrair os melhores alunos de Arquitectura [...]

  2014/09/07 9:41 AM

Systems that are Sensitive to Initial Conditions

Your browser does not support the canvas tag. JavaScript is required to view the contents of this page. Systems that are sensitive to initial conditions are those that whose trajectories diverge in ways that are not predictable. One of those systems is the chaotic Lorenz attractor, but even simpler systems can show dependence on the [...]

  2014/08/29 9:57 PM

Lucy, not really a must go and see film

Take a good idea, a potentially great idea, and put it in the hands of a director (Luc Besson) that is known for stories of triads, professional assassins and revenges and you get Lucy. But the problem is that the brain expansion and the Taipei triad scenario don’t match. This movie was going to be [...]

  2014/08/29 8:49 AM

R Tip: ggplot axis labels

How to change the x and y axis labels in ggplot2? For this example I’ll be using the movies dataset. library(ggplot2) data(movies) Traditionally the labels are set by ggplot directly from aesthetics selected e.g.: p0<-ggplot(data=movies, aes(x=year)) p0<-p0+geom_point(aes(y=rating))+geom_smooth(aes(y=rating)) p0 To change the labels of the ggplot axes we can use xlab and ylab p0+xlab(’The glorious years [...]

  2014/08/18 2:47 PM

Siri’s Inventors Are Building a Radical New AI That Does Anything You Ask

The inventors of Siri are confident that their next creation will eclipse the first. But whether and when that will happen is a question that even Viv herself cannot answer. Yet.via Siri’s Inventors Are Building a Radical New AI That Does Anything You Ask | Enterprise | WIRED. Are we getting to the point of [...]

  2014/08/17 12:39 PM

Is the singularity cost prohibitive?

The idea that a technological singularity is going to hit us any time in the future and that at that moment in time we’ll be presented with (now) unimaginable artificial intelligence (or at least greater than human intelligence, and that’s not saying much because on its own greater-than-human-intelligence is full of caveats) is a recurrent [...]

  2014/07/21 3:42 PM

How Educators Around The World Are Implementing Mobile Learning And What You Can Learn From Them

Still, UNESCO reports that 250 million students worldwide cannot read, write, or count, even after four years of school. Close to 775 million adults– 64% of whom are women–still lack reading and writing skills, with the lowest rates in Sub-Saharan Africa and South and West Asia.via How Educators Around The World Are Implementing Mobile Learning [...]

  2014/07/21 10:01 AM

Global Brain: Web as Self-organizing Distributed Intelligence – Francis Heylighen

OVERVIEW: Distributed intelligence is an ability to solve problems and process information that is not localized inside a single person or computer, but that emerges from the coordinated interactions between a large number of people and their technological extensions. The Internet and in particular the World-Wide Web form a nearly ideal substrate for the emergence [...]

  2014/07/18 9:02 AM

Os regulamentos da cidade islâmica

As leis islâmicas al-fikh abrangem a organização urbana das cidades islâmicas; não segue à risca as imposições de um plano, defende os interesses da família, e revela um modo autossuficiente de fazer cidade, sustentado por suas próprias leis. via arquitextos 169.04 oriente: Os regulamentos da cidade islâmica | vitruvius.

  2014/07/15 7:33 PM

Justin Reich on MOOCs and the Science of Learning

Millions of learners on platforms like edX and Coursera are generating terabytes of data tracking their activity in real time. Online learning platforms capture extraordinarily detailed records of student behavior, and now the challenge for researchers is to explore how these new datasets can be used to advance the science of learning. In this edX [...]

  2014/07/09 10:27 AM

As listas que para aí se fazem

Portugal é o país das listas, de apoio, de censura, para tudo e mais alguma coisa, até para se sair das listas é preciso subscrever outra. Um país de amorfos alistados.

  2014/07/07 6:04 PM

Why I gave up on Evernote

Evernote has been bon out of a great idea, but in the end didn’t evolve into anything special. Looks like a last decade application right now. It is dated in some aspects that one would think a modern note taking application should have Space and features. The basic free account limits are pre-historic for modern [...]

  2014/07/05 9:45 AM

Notas sobre futebol – o debacle Português no Brasil

Como todos os que viram o jogo da selecção Portuguesa contra a Alemanha, também tenho uma opinião que mais do que analítica é intuitiva. Certamente alguns concordarão com alguns dos meus pontos, alguns certamente discordarão. Ainda bem! AINDA (mesmo que alguns não gostem) é possível discordar neste país. Mais uma vez vi o Nani a [...]

  2014/06/17 4:33 PM

Pulley Logic Gates – Just Brilliant

Pulley Logic Gates from Alex Gorischek on Vimeo. Just come across this video of physical logic gates made with some a board, some string and weights. Just brilliant and instructive for any computer geek out there.

  2014/06/03 9:41 AM

Traversing News with Second Order Swarm Intelligence

Figure – Two simplicies a and b connected by the 2-dimensional face, the triangle {1;2;3}. In the analysis of the time-line of The Guardian newspaper (link) the system used feature vectors based on frequency of words and them computed similarity between documents based on those feature vectors. This is a purely statistical approach that requires [...]

  2014/05/28 6:16 PM