Improving distributed representation of word sense via WordNet Gloss composition and context clustering

In recent years, there has been an increas-ing interest in learning a distributed rep-resentation of word sense. Traditional context clustering based models usually require careful tuning of model parame-ters, and typically perform worse on infre-quent word senses. This paper presents a novel approach which addresses these lim-itations by first initializing the word sense embeddings through learning sentence-level embeddings from WordNet glosses using a convolutional neural networks. The initialized word sense embeddings are used by a context clustering based model to generate the distributed representations of word senses. Our learned represen-tations outperform the publicly available embeddings on 2 out of 4 metrics in the word similarity task, and 6 out of 13 sub tasks in the analogical reasoning task.

A gloss composition and context clustering based distributed word sense representation model

In recent years, there has been an increasing interest in learning a distributed representation of word sense. Traditional context clustering based models usually require careful tuning of model parameters, and typically perform worse on infrequent word senses. This paper presents a novel approach which addresses these limitations by first initializing the word sense embeddings through learning sentence-level embeddings from WordNet glosses using a convolutional neural networks. The initialized word sense embeddings are used by a context clustering based model to generate the distributed representations of word senses. Our learned representations outperform the publicly available embeddings on half of the metrics in the word similarity task, 6 out of 13 sub tasks in the analogical reasoning task, and gives the best overall accuracy in the word sense effect classification task, which shows the effectiveness of our proposed distributed distribution learning model.

Lexical database enrichment through semi-automated morphological analysis

Derivational morphology proposes meaningful connections between words and is largely unrepresented in lexical databases. This thesis presents a project to enrich a lexical database with morphological links and to evaluate their contribution to disambiguation. A lexical database with sense distinctions was required. WordNet was chosen because of its free availability and widespread use. Its suitability was assessed through critical evaluation with respect to specifications and criticisms, using a transparent, extensible model. The identification of serious shortcomings suggested a portable enrichment methodology, applicable to alternative resources. Although 40% of the most frequent words are prepositions, they have been largely ignored by computational linguists, so addition of prepositions was also required. The preferred approach to morphological enrichment was to infer relations from phenomena discovered algorithmically. Both existing databases and existing algorithms can capture regular morphological relations, but cannot capture exceptions correctly; neither of them provide any semantic information. Some morphological analysis algorithms are subject to the fallacy that morphological analysis can be performed simply by segmentation. Morphological rules, grounded in observation and etymology, govern associations between and attachment of suffixes and contribute to defining the meaning of morphological relationships. Specifying character substitutions circumvents the segmentation fallacy. Morphological rules are prone to undergeneration, minimised through a variable lexical validity requirement, and overgeneration, minimised by rule reformulation and restricting monosyllabic output. Rules take into account the morphology of ancestor languages through co-occurrences of morphological patterns. Multiple rules applicable to an input suffix need their precedence established. The resistance of prefixations to segmentation has been addressed by identifying linking vowel exceptions and irregular prefixes. The automatic affix discovery algorithm applies heuristics to identify meaningful affixes and is combined with morphological rules into a hybrid model, fed only with empirical data, collected without supervision. Further algorithms apply the rules optimally to automatically pre-identified suffixes and break words into their component morphemes. To handle exceptions, stoplists were created in response to initial errors and fed back into the model through iterative development, leading to 100% precision, contestable only on lexicographic criteria. Stoplist length is minimised by special treatment of monosyllables and reformulation of rules. 96% of words and phrases are analysed. 218,802 directed derivational links have been encoded in the lexicon rather than the wordnet component of the model because the lexicon provides the optimal clustering of word senses. Both links and analyser are portable to an alternative lexicon. The evaluation uses the extended gloss overlaps disambiguation algorithm. The enriched model outperformed WordNet in terms of recall without loss of precision. Failure of all experiments to outperform disambiguation by frequency reflects on WordNet sense distinctions.

Innovative measurement methodology in the study of weathering of automotive coatings

An initial aim of this project was to evaluate the conventional techniques used in the analysis of newly prepared environmentally friendly water-borne automotive coatings and compare them with solvent-borne coatings having comparable formulations. The investigation was carried out on microtuned layers as well as on complete automotive multi-layer paint systems. Methods used included the very traditional methods of gloss and hardness and the commonly used photo-oxidation index (from FTIR spectral analysis). All methods enabled the durability to weathering of the automotive coatings to be initially investigated. However, a primary aim of this work was to develop methods for analysing the early stages of chemical and property changes in both the solvent-borne and water-borne coating systems that take place during outdoor natural weathering exposures and under accelerated artificial exposures. This was achieved by using dynamic mechanical analysis (DMA), in both tension mode on the microtomed films (on all depths of the coating systems from the uppermost clear-coat right down to the electron-coat) and bending mode of the full (unmicrotomed) systems, as well as MALDI-Tof analysis on the movement of the stabilisers in the full systems. Changes in glass transition temperature and relative cross-link density were determined after weathering and these were related to changes in the chemistries of the binder systems of the coatings after weathering. Concentration profiles of the UV-stabilisers (UVA and HALS) in the coating systems were analysed as a consequence of migration in the coating systems in separate microtomed layers of the paint samples (depth profiling) after weathering and diffusion co-efficient and solubility parameters were determined for the UV stabilisers in the coating systems. The methods developed were used to determine the various physical and chemical changes that take place during weathering of the different (water-borne and solvent-borne) systems (photoxidation). The solvent-borne formulations showed less changes after weathering (both natural and accelerated) than the corresponding water-borne formulations due to the lower level of cross-links in the binders of the water-borne systems. The silver systems examined were more durable than the blue systems due to the reflecting power of the aluminium and the lower temperature of the silver coatings.

McKinney, Mark. Redrawing French Empire Comics. Columbus, The Ohio State University Press, 2013. 304 pages. 9780814212202

The history of France and its empires is one that has been well trodden, particularly the French occupation, and subsequent war, in Algeria. In this companion to his earlier work, 2011’s The Colonial Heritage of French Comics,McKinney attempts to examine the reconstruction of French national identity in the wake of decolonisation through the medium of Francophonecomics. He endeavours to study the colonial affrontier (3), the space in which France and its colonies are connected and divided, where they seek to confront each other, or to seek peace and the removal of the division. McKinney argues this affrontier can be found most strongly in the Francophone comics produced dealing with the French colonial experience in Algeria, as well as that of Indochina,and does so from both sides of each conflict. McKinney examines in detail the French colonisation of Algeria (1830sonwards), the French war in Indochina (1946–54) and the Algerian war (1954–62), and his work is the first to approach these well-covered areas of research through the medium of comics. The resulting work takes the form of an investigation into the five forms of genealogical inquiry utilised in comics regarding these conflicts. His approach investigates the familial, ethnic, national, artistic and critical forms of genealogy relating to colonialism and imperialism from a variety of viewpoints, including the previously overlooked perspective of the pieds noirs. He aims to highlight both those cartoonists that critique the colonial ideology, as well as those cartoonists who to some extent attempt to gloss over or even romanticise the French empire, strengthening the affrontier. He positions himself alongside Foucault in seeing genealogy as a useful means of establishing ‘historical knowledge of struggles’ (Foucault1980, 85), but McKinney looks at the colonial representation in a popular medium,including the recent increase in comics produced which consider the French colonial experience. He argues that this consideration of the present, as well as European imperialism, is absent in the work of Foucault. The text is accompanied by a number of black and white facsimiles of pages from the comics he analyses to illustrate the different and often conflicting positions of cartoonists on these issues. Overall, McKinney’s work is a welcome addition to the study of the French colonial experience, which separates its elf from the rest by using Francophonecomics as lenses through which to look at these already well-trodden areas of study. He succeeds in determining if and how cartoonists critique colonial ideology and representations on both sides of the conflicts, a task in which he is unarguably successful. McKinney’s work, however, is unfortunately let down by typo graphicerrors, which occur throughout the text.Nevertheless, McKinney’s work is another important work in the field of Bande Dessine ́e scholarship, and useful for anyone interested in the representations of colonialism and imperialism in French comics, accompanied by anencyclopaedic bibliography of comics produced on this topic.