L2 Korean Phonology: the acquisition of stops by English-and Finnish-speaking adults

The purpose of this thesis is to find the reason why attaining nativelike pronunciation is difficult in adult L2A. This thesis attempts to take a purely linguistic approach to find it by hypothising that the acquisition of segmental phonology is more than the physical matter of getting the articulators to move correctly and involves phonological rules and principles. The hypothesis was tested through the L2A of Korean stops, which was investigated in three parts; perception of stop segments in word-initial position, production of stop segments in word-initial position and production of stops involving phonological rules constrained by syntax (i.e. the tensification rule vs. the intervocalic voicing rule).Thirteen British English-speaking adults and fifteen Finnish-speaking adults participated in the experiment. The research subjects were divided into three different groups ('Inexperienced I'， 'Inexperienced n' and 'Experienced') according to the length of exposure to Korean. The subjects in the group of 'Inexperienced ľ were exposed to Korean for one year in their native countries, and the subjects in the group of 'Inexperienced 11' for two years in their native countries. The subjects in the group of 'Experienced' attended a Korean language course for one academic year at least in Korea. Firstly, as for perception of stop segments in word-initial position, both English- and Finnish-speaking learners performed better in discerning geminates from non- geminate segment in general. Especially, the two language groups of learners were native-like in discerning a geminate (AA) from a non-geminate of which the segment is different from the ones in the geminate (B). On the contrary, the Korean stops distinguished by the feature [sg] alone have appeared the most difficult for the L2 learners of Korean to acquire. The English- and Finnish-Speaking learners showed a similar pattern of difficulties in discerning Korean stops regarding the feature [sg]; however, differences between the two language groups were also found in the perception of word-initial Korean stops, which were caused by the absence or presence of geminate in the learners' L1. On the other hand, no progress was made by English- and Finnish-speaking learners in the acquisition of Korean stops in accordance with the length of exposure to Korean. Secondly, the production of word-initial stop segments appeared more successful than the perception of them. The difficulty in producing word-initial stops seemed to be caused by Korean-particular phonological representations rather than controlling the degree of VOT values. As for the developmental aspect, English- and Finnish-speaking learners showed the improvement in the segmental production task according to the length of exposure to Korean unlike in the segmental perception task. Thirdly, the English- and Finnish-speaking I earners performed equally poorly on the tensification rule despite the differences in their L1’s. One reason was that the learners in both language groups were not advanced enough to sense the interaction between the phonological rule and syntactic condition in the Korean grammar. Another reason was orthographic influence. Regardless of the two language groups' similarly poor results in performance on the tensification rule, it was presumed that only Finnish speakers would be able to acquire the Korean-specific rule with the supposition that positive L1 transfer might occur at the even advanced stages of learning. In the light of the findings, it was concluded that the hypothesis of this thesis was supported by results from the experiment. Observing that the L2 learners had far greater difficulty in their production of stops involved in the tensification rule constrained by syntax than in their production of word-initial stops, it is concluded that the difficulty of mastering L2 phonology is due to the complexity of phonological rules applying beyond the component of phonology or across phonological domains in the prosodie hierarchy, some of which provide a means for mapping the syntax to the phonology. Therefore, all the complex phonological rules and principles of a segment must be acquired for the target pronunciation

Mirage cosmology with an unstable probe D3-brane

We consider the mirage cosmology by an unstable probe brane whose action is represented by BDI action with tachyon. We study how the presence of tachyon affects the evolution of the brane inflation. At the early stage of the brane inflation, the tachyon kinetic term can play an important role in curing the superluminal expansion in mirage cosmology.Comment: 11 pages, improved presentation with some clarifications, typos corrected, references adde

Who Is Caring for the Caregiver? The Role of Cybercoping for Dementia Caregivers

The purpose of this study is to investigate the relationship between dementia caregivers’ communication behaviors (information seeking and forwarding) and their outcomes (coping outcomes: e.g., dealing better with negative feelings or improved medical outcomes). A survey data set of dementia patients’ caregivers substantiates the effects of communication behaviors about dementia illness on coping outcomes, as well as the mediating role of emotion-focused and problem-focused coping processes. Using structural equation modeling (SEM), this study found positive effects of communication behaviors on outcomes through coping processes. Further, the results indicate that communication behaviors in cyberspace are crucial for caregivers to cope with dementia, both affectively (improvement of caregivers’ emotional control) and physically (health improvement of patients). The implications for the improvement of public health through online health communication behaviors are discussed

Topology of Luminous Red Galaxies from the Sloan Digital Sky Survey

We present measurements of the genus topology of luminous red galaxies (LRGs) from the Sloan Digital Sky Survey (SDSS) Data Release 7 catalog, with unprecedented statistical significance. To estimate the uncertainties in the measured genus, we construct 81 mock SDSS LRG surveys along the past light cone from the Horizon Run 3, one of the largest N-body simulations to date that evolved 7210^3 particles in a 10815 Mpc/h size box. After carefully modeling and removing all known systematic effects due to finite pixel size, survey boundary, radial and angular selection functions, shot noise and galaxy biasing, we find the observed genus amplitude to reach 272 at 22 Mpc/h smoothing scale with an uncertainty of 4.2%; the estimated error fully incorporates cosmic variance. This is the most accurate constraint of the genus amplitude to date, which significantly improves on our previous results. In particular, the shape of the genus curve agrees very well with the mean topology of the SDSS LRG mock surveys in the LCDM universe. However, comparison with simulations also shows small deviations of the observed genus curve from the theoretical expectation for Gaussian initial conditions. While these discrepancies are mainly driven by known systematic effects such as those of shot noise and redshift-space distortions, they do contain important cosmological information on the physical effects connected with galaxy formation, gravitational evolution and primordial non-Gaussianity. We address here the key role played by systematics on the genus curve, and show how to accurately correct for their effects to recover the topology of the underlying matter. In a forthcoming paper, we provide an interpretation of those deviations in the context of the local model of non-Gaussianity.Comment: 23 pages, 18 figures. APJ Supplement Series 201

Sparse Linear Representation

This paper studies the question of how well a signal can be reprsented by a sparse linear combination of reference signals from an overcomplete dictionary. When the dictionary size is exponential in the dimension of signal, then the exact characterization of the optimal distortion is given as a function of the dictionary size exponent and the number of reference signals for the linear representation. Roughly speaking, every signal is sparse if the dictionary size is exponentially large, no matter how small the exponent is. Furthermore, an iterative method similar to matching pursuit that successively finds the best reference signal at each stage gives asymptotically optimal representations. This method is essentially equivalent to successive refinement for multiple descriptions and provides a simple alternative proof of the successive refinability of white Gaussian sources.Comment: 5 pages, to appear in proc. IEEE ISIT, June 200