Search results for "relation"
showing 10 items of 10542 documents
GenClust: A genetic algorithm for clustering gene expression data
2005
Abstract Background Clustering is a key step in the analysis of gene expression data, and in fact, many classical clustering algorithms are used, or more innovative ones have been designed and validated for the task. Despite the widespread use of artificial intelligence techniques in bioinformatics and, more generally, data analysis, there are very few clustering algorithms based on the genetic paradigm, yet that paradigm has great potential in finding good heuristic solutions to a difficult optimization problem such as clustering. Results GenClust is a new genetic algorithm for clustering gene expression data. It has two key features: (a) a novel coding of the search space that is simple, …
Data Analysis and Bioinformatics
2007
Data analysis methods and techniques are revisited in the case of biological data sets. Particular emphasis is given to clustering and mining issues. Clustering is still a subject of active research in several fields such as statistics, pattern recognition, and machine learning. Data mining adds to clustering the complications of very large data-sets with many attributes of different types. And this is a typical situation in biology. Some cases studies are also described.
Distance Functions, Clustering Algorithms and Microarray Data Analysis
2010
Distance functions are a fundamental ingredient of classification and clustering procedures, and this holds true also in the particular case of microarray data. In the general data mining and classification literature, functions such as Euclidean distance or Pearson correlation have gained their status of de facto standards thanks to a considerable amount of experimental validation. For microarray data, the issue of which distance function works best has been investigated, but no final conclusion has been reached. The aim of this extended abstract is to shed further light on that issue. Indeed, we present an experimental study, involving several distances, assessing (a) their intrinsic sepa…
Structural clustering of millions of molecular graphs
2014
We propose an algorithm for clustering very large molecular graph databases according to scaffolds (i.e., large structural overlaps) that are common between cluster members. Our approach first partitions the original dataset into several smaller datasets using a greedy clustering approach named APreClus based on dynamic seed clustering. APreClus is an online and instance incremental clustering algorithm delaying the final cluster assignment of an instance until one of the so-called pending clusters the instance belongs to has reached significant size and is converted to a fixed cluster. Once a cluster is fixed, APreClus recalculates the cluster centers, which are used as representatives for…
The Three Steps of Clustering In The Post-Genomic Era
2013
This chapter descibes the basic algorithmic components that are involved in clustering, with particular attention to classification of microarray data.
Problemática laboral de los socios trabajadores de las empresas de Economía Social: ¿socios o trabajadores?
1999
Co-operatives and labour societies are the most important organisations within the framework of Social Economy. The establishment of these societies, which create employment in the private sector with a democratic philosophy based on mutual help, has been recently boosted thanks to the support of public power. Their growing importance can be explained by three factors: the Employment Policy, the Social Policy and the productive decentralisation. As far as labour is concerned, these societies offer the following advantages: intensive use of labour, high rate of stability in employment, high levels of productivity, training and surplus re-inversion, lower rate of inflation, fewer conflicts th…
Helping children in bullying situations: The role of intersubjective understanding and co-regulation
2020
Contemporary definitions of bullying are strikingly in agreement that bullying represents aggressive behaviour involving premeditation, time span, power imbalance and clear role assignment. Even though useful in some situations, these premises are not as helpful if the aim is to improve the social environment in educational contexts. The aim of the present article is to argue that educators need alternative theoretical tools when attempting to improve relations between children. We argue that interpretations of bullying in educational contexts are not ‘owned’ by any specific party, but rather involve (1) intersubjective negotiation and (2) the co-regulative competence of educators and child…
The dual equivalence of equations and coequations for automata
2015
The transition structure α : X ? X A of a deterministic automaton with state set X and with inputs from an alphabet A can be viewed both as an algebra and as a coalgebra. We use this algebra-coalgebra duality as a common perspective for the study of equations and coequations. For every automaton ( X , α ) , we define two new automata: free ( X , α ) and cofree ( X , α ) representing, respectively, the greatest set of equations and the smallest set of coequations satisfied by ( X , α ) . Both constructions are shown to be functorial. Our main result is that the restrictions of free and cofree to, respectively, preformations of languages and to quotients A * / C of A * with respect to a congr…
Evaluation of legendre functions of argument greater than one
1997
Abstract In this paper we present an algorithm to evaluate Legendre functions of the first and second kinds ( P v , Q v ) for integraland half-integral order and argument greater than one. The code is based on the calculation of the continued fraction for the Q 's. the Wronskian relating P 's and Q 's and the application of forward recurrence relations for the P 's and backward recurrence for the Q 's. We also show an application of these algorithms to the evaluation of the electrostatic field due to a charged toroidal conductor at potential V .
Employees’ Acceptance and Involvement in Accordance with Codes of Conduct – Chinese Business Behaviour vs. Western Compliance Management Systems
2015
Abstract More stringent anti-corruption and anti-bribery laws in the US, Europe and PR China as well as the current political anti-corruption-campaign in China force Western globally active companies to implement Code of Conducts at their subsidiaries worldwide – thus also in China. There are mixed results of existing academic research on the impact of Codes of Conduct regarding ethical behaviour of the employees in connection with these Codes. The purpose of this study is to gain a better understanding of the motivation and intention of employees to accept and act according to a local Code of Conduct. This research is conducted in a cross-cultural setting (PR China, Germany, Austria) by ta…