Mel-frequency cepstral coefficients (MFCCs) are widely adopted in speech recognition as well as speaker recognition applications. They are extracted to primarily characterize the spectral envelope of a quasi-stationary speech segment. It was shown that cepstral features are closely related to the linguistic content of speech. Besides the magnitude-based cepstral features, there are resources in speech, e.g, the phase and excitation source, are believed to contain useful properties for speaker discrimination. Moreover, in real situations, there are large variations exist between the development and application scenarios for a speaker recognition system. These include channel mismatch, recording apparatus mismatch, environmental variation, or even change of emotional/healthy state of speakers. As a consequence, the magnitude-based features are insufficient to provide satisfactory and robust speaker recognition accuracy. Therefore, the exploitation of complementary features with MFCCs may provide one solution to alleviate the deficiency, from a feature-based perspective. / Speaker recognition (SR) refers to the process of automatically determining or verifying the identity of a person based on his or her voice characteristics. In practical applications, a voice can be used as one of the modalities in a multimodal biometric system, or be the sole medium for identity authentication. The general area of speaker recognition encompasses two fundamental tasks: speaker identification and speaker verification. / Wang, Ning. / Adviser: Pak-Chung Ching. / Source: Dissertation Abstracts International, Volume: 73-06, Section: B, page: . / Thesis (Ph.D.)--Chinese University of Hong Kong, 2011. / Includes bibliographical references (leaves 177-193). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [201-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese.

by Chan Chi Wai, Angus. / "Submitted in Jan 1999, revised in Jan 2000." / Thesis (M.D.)--Chinese University of Hong Kong, 2000. / Includes bibliographical references (p. 262-294). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Mode of access: World Wide Web.

<p>This corpus-based study analyzes different types of epistemic markers used in argumentative essays by University students. More specifically it compares Swedish L2 writers and English L1 writers. The scope of the analysis covers epistemic modal verbs, lexical verbs and adverbs. A number of markers are counted to see which expressions are preferred by L1 and L2 writers respectively and if the frequency rates differ between the two groups. Further, it discusses whether the non-native writers use epistemic markers appropriate to an academic register, and an attempt is made to see whether the L1 and L2 writers show similar patterns of ‘committing’ to and ‘distancing’ themselves to their arguments. The results reveal a few notable differences between the Swedish and English writers. A tendency is seen among the L2 writers to ‘overuse’ certain expressions, particularly in the category of lexical verbs. Compared to the native writers, the L2 writers display higher frequency rates when it comes to markers that are most commonly found in spoken conversation. Further the L2 writers seem to display more ‘writer visibility’ than the L1 writers do, which could perhaps be due to differences in writing culture. The findings also suggest that Swedish L2 writers, even on a relatively advanced level, may have difficulties in mastering modal expressions in English.</p>

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The Simplest Quantified Modal Logic (SQML) is controversial because it seems to conflict with some of our most basic intuitions about what is possible and what is necessary. Two controversial principles, the Barcan Schema (BS) and Necessary Existence NE, are valid in SQML models. Informally expressed, BS requires that, if it is possible that something is F, then there is something that is possibly F. This result seems to conflict with the intuition that there is some property F such that F could have been exemplified, though is not possibly exemplified by any existing thing. NE conflicts with the intuition that there could have been more/different existents than there actually are and the intuition that those things that actually exist could have failed to exist. The primary goal of this thesis is to provide a semantics for SQML that justifies the validity of BS and NE with these intuitions in mind. This is the focus of the fifth section of the thesis. In the first four sections of the thesis, I discuss prior attempts to meet my primary goal, all of which I consider unsuccessful. According to my view, which I call M-combinatorialism, the world is comprised of simples, mereological sums of those simples and universals that the former objects exemplify. I argue that we can justify the validity of BS by appealing to these facts about simples and sums: (1) simples are arranged such that the sums of these simples exemplify certain properties, (2) the actual arrangement of any given number of simples is a contingent matter and (3) had the simples that are actually arranged to form the complex objects in the actual world been arranged differently, the sums of these simples could have exemplified radically different properties. Insofar as Combinatorialists construct all possible individuals only out of actual individuals, they are committed to the necessary existence of those actual individuals, which allows the M-Combinatorialist to justify the validity of NE. So, the M-Combinatorialist is able to provide an adequate semantics for SQML. In the final section, I defend my view against objections.

I develop a novel metaphysical theory of the modal structure of the physical world, which has important consequences for debates regarding laws of nature, scientific explanation, the nature of physical properties, and the applicability of mathematics to science. The theory holds that modal properties of the physical world metaphysically depend on properties of mathematical structures. I show that the relation of metaphysical dependence is naturalistically acceptable by offering examples of non-causal scientific explanation that tacitly make use of such a notion. My view offers a non-Humean understanding of nomological necessity, a unification of the epistemology of modality with the epistemology of mathematics, and an explanation of the success of mathematics in predicting and explaining empirical phenomena. / text

This study examined the effects of manipulating the modality (text-only, voice-only, voice+text) of a tutorial and restriction (restricted vs. unrestricted) of a simulation's interface on retention and transfer of tutorial content. The tutorial prepared novice students to use Packet Tracer, a simulation developed by Cisco that teaches network engineers how to build and troubleshoot computer networks. Retention was measured using a multiple choice test whereas transfer was measured using an assessment embedded within Packet Tracer. An interaction was found between modality and restriction on the Packet Tracer transfer test. When Packet Tracer's interface was unrestricted, students who received the voice-only tutorial performed significantly better on the transfer test than students who received the text-only tutorial. This finding is consistent with the cognitive theory of multimedia learning and previous research on modality effect. However, this is also an original finding because previous research has not examined the interaction between a tutorial's modality and the restriction of a complex simulation's interface. This study addressed relevant instructional technology design questions, such as how to design tutorials for complex simulations and what effect restricting a simulation's interface has on retention and transfer for novice students. / text

The segment of the population that is 65 years and older is undergoing rapid growth. With this growth, there is an increased need for speech-language pathologists (SLPs) to treat cognitive-communicative disorders, most of which are age-related disorders secondary to neurologic disease. To do this effectively, SLPs require an understanding of how healthy aging affects cognition, memory and sensory processing. Although the interactions between sensory and cognitive processing are increasingly being investigated, little attention has been paid to the relationship between modality of information presentation and language comprehension in aging. Language comprehension is affected by component processes such as memory span and processing abilities, but to date there has been no systematic investigation of the effect of presentation modality on the processing of linguistic information across a number of tasks ranging in complexity.The primary purpose of this study was to investigate the effects of presentation modality on language processing. The secondary purposes of the study were to determine whether age affected performance on language processing measures, and whether adults can accurately predict if their performance was better in either the auditory or visual presentation condition. The effects of presentation modality were evaluated on four dependent measures: a digit span task, a word span task, a complex span task and a procedural instruction processing task. The participants were 37 older adults and 41 younger adults, matched for years of education and estimated verbal IQ.Three notable findings emerged from the study. First, both young and older adults recalled more information when it was presented in the auditory modality, regardless of the task. Second, age effects were present on all measures. Third, individuals were generally inaccurate in predicting which modality would result in better processing. Implications for the evaluation and treatment of older adults are discussed.

Towards a Unified Treatment of Modality (abstract) Sumayya Racy, Ph.D. The primary claim of this thesis is that despite the numerous forms modality may take, both within and across languages, there are relatively few features, structures and operations which give rise to these numerous forms. For example, in English the modal notion of obligation may be expressed by a verb (He must go), but an adverb (He obligatorily goes), by an adjective (He is obliged), by a noun (He has an obligation), and even by a preposition (It's on him to go) or by no clear modal marker (He is to go). In other languages, we find still more ways in which modality may be expressed, such as through affixes (Garo), through evidentials (Tuyuca), through modal particles (Norwegian), and through mood (Latin). It is shown in this thesis that by adopting Cinque's (1999) hierarchy of functional projections, Distributed Morphology (Halle & Marantz 1993), the semantics of Kratzer (1991) and Hacquard (2006) and a limited feature set, we may account for many of these expressions of modality within a single unified framework. In particular, it is argued that modal roots are acategorial (accounting for the many parts of speech we find in modal expressions) and it is proposed that head movement and fusion may take place among modal functional heads (accounting for the fact that modality may be expressed through other categories like evidentiality). Along the way, several interesting facets of modality are pointed out, including the fact that modal nouns may only be used with unusual abilities, and the fact that in English intonation and ASL repeated movement we may find phonological correlates of epistimicity.

This dissertation consists of two parts. Part I proposes a new approach to modality, abductive modal realism. Part II proposes a new version of physicalism, abductive physicalism. The parts relate in that abductive physicalism presupposes abductive modal realism.Abductive modal realism holds that inference to the best explanation (i.e. abduction) grounds some and any justified belief about mind-independent necessity and possibility. This approach avoids the disadvantages of extant approaches to modality. Specifically, unlike extant approaches, abductive modal realism accepts real, mind-independent necessities and possibilities without employing a modal epistemology that fits these poorly. Abductive physicalism holds that we should adopt abductive modal realism, that abduction favors physicalism, and thus, that we should adopt physicalism. Although standard a posteriori physicalism accepts the latter claims, it sees appeals to abduction as exceptions to an otherwise non-abductive modal epistemology. Abductive physicalism, contrariwise, sees abduction as the arbitrator of modal disputes quite generally. This difference allows abductive physicalism to avoid problems that plague standard a posteriori physicalism.