104 research outputs found
A Coding Theoretic Study on MLL proof nets
Coding theory is very useful for real world applications. A notable example
is digital television. Basically, coding theory is to study a way of detecting
and/or correcting data that may be true or false. Moreover coding theory is an
area of mathematics, in which there is an interplay between many branches of
mathematics, e.g., abstract algebra, combinatorics, discrete geometry,
information theory, etc. In this paper we propose a novel approach for
analyzing proof nets of Multiplicative Linear Logic (MLL) by coding theory. We
define families of proof structures and introduce a metric space for each
family. In each family, 1. an MLL proof net is a true code element; 2. a proof
structure that is not an MLL proof net is a false (or corrupted) code element.
The definition of our metrics reflects the duality of the multiplicative
connectives elegantly. In this paper we show that in the framework one
error-detecting is possible but one error-correcting not. Our proof of the
impossibility of one error-correcting is interesting in the sense that a proof
theoretical property is proved using a graph theoretical argument. In addition,
we show that affine logic and MLL + MIX are not appropriate for this framework.
That explains why MLL is better than such similar logics.Comment: minor modification
Unifying type systems for mobile processes
We present a unifying framework for type systems for process calculi. The
core of the system provides an accurate correspondence between essentially
functional processes and linear logic proofs; fragments of this system
correspond to previously known connections between proofs and processes. We
show how the addition of extra logical axioms can widen the class of typeable
processes in exchange for the loss of some computational properties like
lock-freeness or termination, allowing us to see various well studied systems
(like i/o types, linearity, control) as instances of a general pattern. This
suggests unified methods for extending existing type systems with new features
while staying in a well structured environment and constitutes a step towards
the study of denotational semantics of processes using proof-theoretical
methods
Hybrid Type-Logical Grammars, First-Order Linear Logic and the Descriptive Inadequacy of Lambda Grammars
In this article we show that hybrid type-logical grammars are a fragment of
first-order linear logic. This embedding result has several important
consequences: it not only provides a simple new proof theory for the calculus,
thereby clarifying the proof-theoretic foundations of hybrid type-logical
grammars, but, since the translation is simple and direct, it also provides
several new parsing strategies for hybrid type-logical grammars. Second,
NP-completeness of hybrid type-logical grammars follows immediately. The main
embedding result also sheds new light on problems with lambda grammars/abstract
categorial grammars and shows lambda grammars/abstract categorial grammars
suffer from problems of over-generation and from problems at the
syntax-semantics interface unlike any other categorial grammar
Foundations of Software Science and Computation Structures
This open access book constitutes the proceedings of the 22nd International Conference on Foundations of Software Science and Computational Structures, FOSSACS 2019, which took place in Prague, Czech Republic, in April 2019, held as part of the European Joint Conference on Theory and Practice of Software, ETAPS 2019. The 29 papers presented in this volume were carefully reviewed and selected from 85 submissions. They deal with foundational research with a clear significance for software science
Ćtude des signatures gĆ©niques dans un contexte dāexpĆ©riences de RNA- Seq
Le principal inteĢreĢt des expeĢriences de seĢquencĢ§age dāARN (RNA-Seq) est quāelles consti- tuent une vue dāensemble sur les proceĢdeĢs geĢniques intrinseĢques de la cellule. LāeĢtat malade diffeĢre de lāeĢtat sain de par son usage geĢnique et de nombreux efforts ont eĢteĢ canaliseĢs dans les dernieĢres anneĢes en bioinformatique, pour affiner ces signatures geĢ- niques, notamment dans la classification de leuceĢmies et le typage de cancers du sein. Tous ces modeĢles voient, cependant, leur performance deĢteĢrioreĢe par un grand nombre de dimensions dāentreĢe et la plupart des auteurs choisissent dāimposer un seuil dāexclusion de geĢnes. Jāai voulu deĢterminer la nature dāune signature geĢnique et sa taille optimale, en nombre de geĢnes. Pour deĢterminer la taille dāune signature geĢnique jāai appliqueĢ des algorithmes de co-partitionnements aĢ un sous-ensemble de donneĢes transcriptomiques afin dāen extraire la signature geĢnique. Mes reĢsultats indiquent que la signature geĢnique ne peut eĢtre extraite en entier et lāutilisation de seuils dāexclusions de geĢnes est le prin- cipal probleĢme. Jāai exploreĢ une meĢthode dāextraction de la signature geĢnique avec un reĢseau de neurones artificiels (ANN) en calculant le plus petit ajustement en expression geĢnique neĢcessaire pour passer dāun pheĢnotype aĢ un autre. La signature geĢnique extraite indique que presque la totaliteĢ des geĢnes sont affecteĢs pour un pheĢnotype donneĢ. ConseĢ- quemment, il est inapproprieĢ de consideĢrer des meĢthodes avec seuil dāexclusion de geĢnes et je propose que les signatures geĢniques sont des pheĢnomeĢnes omnigeĢniques. Afin de pallier aĢ lāinconveĢnient duĢ aĢ la neĢcessiteĢ dāinclure tous les geĢnes dans lāanalyse, jāai eĢlaboreĢ une meĢthode dāapprentissage machine par ANN qui geĢre simultaneĢment deux espaces : lāespace des geĢnes et lāespace des eĢchantillons. Les coordonneĢes des geĢnes et des eĢchantillons dans leur espaces respectifs sont arrangeĢs de manieĢre aĢ ce quāils preĢ- disent lāexpression geĢnique. Ma contribution est donc un modeĢle qui apprend de manieĢre simultaneĢe les interactions entre les geĢnes et les interactions entre les eĢchantillons. Ma meĢthode permet eĢgalement dāinclure dans lāanalyse de jeux de donneĢes partiellement manquantes, faisant le lien vers lāinteĢgration de donneĢes et lāanalyses dāeĢchantillons de seĢquencĢ§age de cellule unique (scRNA-Seq).The main appeal of RNA sequencing experiments is that they offer a general view of all cellās intrinsic genetic processes. Diseased state differs from healthy by itās gene usage and many efforts have been channeled in bioinformatics these last few years to purify these gene signatures, in particular in the classification of leukemia and breast cancer subtyping. However, these models see their performance hindered by a large size of input dimensions and most authors chose to impose a threshold of gene exclusion. I wanted to determine what is a gene signature and how many genes it truly contains. To determine itās size, I applied co-clustering algorithms to a subset of transcriptomic data, to extract itās gene signature. My results indicate that the gene signature cannot be extracted entirely and the use of exclusion thresholds is the main problem. I then explored a gene signature extraction method using an artificial neural net (ANN), by calculating the smallest adjustment in gene expression necessary to go from one phe- notypic class to another. The extracted gene signature indicated that almost all genes are affected for the given phenotype. Consequently, it seems inappropriate to consider threshold-based methods and I, therefore, propose that gene signatures are omnigenic phenomena. To level the disadvantage of having to include all genes in gene expres- sion analyses, I designed a ANN method that simultaneously manages two spaces: the gene and the sample space. The coordinates for genes and samples in their respective space are arranged to predict the gene expression. My contribution is a model that learns simultaneously about genes and samples. My method allows the analysis of datasets with missing data, making the integration of heterogenous data integration as well as the analysis of single-cell RNA-Seq experiments
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