3,406 research outputs found
Tracial gauge norms on finite von Neumann algebras satisfying the weak Dixmier property
In this paper we set up a representation theorem for tracial gauge norms on
finite von Neumann algebras satisfying the weak Dixmier property in terms of Ky
Fan norms. Examples of tracial gauge norms on finite von Neumann algebras
satisfying the weak Dixmier property include unitarily invariant norms on
finite factors (type {\rm II}\sb 1 factors and M_n(\cc)) and symmetric
gauge norms on and \cc^n. As the first application, we obtain
that the class of unitarily invariant norms on a type {\rm II}\sb 1 factor
coincides with the class of symmetric gauge norms on and von
Neumann's classical result \cite{vN} on unitarily invariant norms on
M_n(\cc). As the second application, Ky Fan's dominance theorem \cite{Fan} is
obtained for finite von Neumann algebras satisfying the weak Dixmier property.
As the third application, some classical results in non-commutative
-theory (e.g., non-commutative Hlder's inequality,
duality and reflexivity of non-commutative -spaces) are obtained for
general unitarily invariant norms on finite factors. We also investigate the
extreme points of \NN(\M), the convex compact set (in the pointwise weak
topology) of normalized unitarily invariant norms (the norm of the identity
operator is 1) on a finite factor \M. We obtain all extreme points of
\NN(M_2(\cc)) and many extreme points of \NN(M_n(\cc)) (). For a
type {\rm II}\sb 1 factor \M, we prove that if () is a
rational number then the Ky Fan -th norm is an extreme point of \NN(\M).Comment: 48 pages, final version, to appear in J. Funct. Ana
Investigation of Training Algorithms for Hidden Markov Models Applied to Automatic Speech Recognition
The work presented in this thesis focuses on simulating a speech recognizer which is trained by different people with different speaking styles and investigates how sensitive the training and recognition processes are to the variations in the training data. There are four main parts to this work. The first involves an experiment of weighting methods for training with multiple observation sequences. The second involves the testing of different initial parameters. The third part includes the first experiment involving training with multiple observation sequences. The model\u27s sensitivity to variations in training data was evaluated by comparing the cases of different values of variation. The final part varied the observation vectors with the variation restricted to only one of the eight positions in the sequence. The experiment was repeated for each of eight positions in the observation sequence, and the effect on recognition was evaluated
Phoneme Weighting and Energy-Based Weighting for Speaker Recognition
This dissertation focuses on determining specific vowel phonemes which work best for speaker identification and speaker verification, and also developing new algorithms to improve speaker identification accuracy. Results from the first part of our research indicate that the vowels /i/, /E/ and /u/ were the ones having the highest recognition scores for both the Gaussian mixture model (GMM) and vector quantization (VQ) methods (at most one classification error). For VQ, /i/, /I/, /e/, /E/ and /@/ had no classification errors. Persons speaking /E/, /o/ and /u/ have been verified well by both GMM and VQ methods in our experiments. For VQ, the verification results are consistent with the identification results since the same five phonemes performed the best and had less than one verification error. After determining several ideal vowel phonemes, we developed new algorithms for improved speaker identification accuracy. Phoneme weighting methods (which performed classification based on the ideal phonemes we found from the previous experiments) and other weighting methods based on energy were used. The energy weighting methods performed better than the phoneme weighting methods in our experiments. The first energy weighting method ignores the speech frames which have relatively small magnitude. Instead of ignoring the frames which have relatively small magnitude, the second method emphasizes speech frames which have relatively large magnitude. The third method and the adjusted third method are a combination of the previous two methods. The error reduction rate was 7.9% after applying the first method relative to a baseline system (which used Mel frequency cepstral coefficients (MFCCs) as feature and VQ as classifier). After applying the second method and the adjusted third method, the error reduction rate was 28.9% relative to a baseline system
T-Duality and Homological Mirror Symmetry of Toric Varieties
Let be a complete toric variety. The coherent-constructible
correspondence of \cite{FLTZ} equates \Perf_T(X_\Sigma) with a
subcategory Sh_{cc}(M_\bR;\LS) of constructible sheaves on a vector space
M_\bR. The microlocalization equivalence of \cite{NZ,N} relates these
sheaves to a subcategory Fuk(T^*M_\bR;\LS) of the Fukaya category of the
cotangent T^*M_\bR. When X_\Si is nonsingular, taking the derived category
yields an equivariant version of homological mirror symmetry,
DCoh_T(X_\Si)\cong DFuk(T^*M_\bR;\LS), which is an equivalence of
triangulated tensor categories.
The nonequivariant coherent-constructible correspondence of
\cite{T} embeds \Perf(X_\Si) into a subcategory
Sh_c(T_\bR^\vee;\bar{\Lambda}_\Si) of constructible sheaves on a compact
torus T_\bR^\vee. When X_\Si is nonsingular, the composition of
and microlocalization yields a version of homological mirror
symmetry, DCoh(X_\Sigma)\hookrightarrow DFuk(T^*T_\bR;\bar{\Lambda}_\Si),
which is a full embedding of triangulated tensor categories.
When X_\Si is nonsingular and projective, the composition is compatible with T-duality, in the following sense. An equivariant
ample line bundle \cL has a hermitian metric invariant under the real torus,
whose connection defines a family of flat line bundles over the real torus
orbits. This data produces a T-dual Lagrangian brane on the
universal cover T^*M_\bR of the dual real torus fibration. We prove \mathbb
L\cong \tau(\cL) in Fuk(T^*M_\bR;\LS). Thus, equivariant homological mirror
symmetry is determined by T-duality.Comment: 34 pages, 2 figures. The previous version of this paper has now been
broken into two parts. The other part is available at arXiv:1007.005
THAI STUDENTS’ AWARENESS ATTITUDES OF GLOBAL ENGLISHES PEDAGOGY AND TARGET INTERLOCUTOR
The widespread use of English as a world language has caused changes in the sociolinguistic reality of English speakers, English use, and English-speaking societies. No paradigm has been able to completely capture and account for such changes in the English language given the current changes. In order to reflect the sociolinguistic realities of today, researchers have advocated for a paradigm shift from traditional pedagogy to a new pedagogy that can prepare students to use English in intercultural communication and incorporate multiple varieties of English and cultures. The attitudes of 20 Thai English major students who successfully completed a one-semester Global English language teaching course were investigated using questionnaire and interview data. The analysis included both quantitative and qualitative methods using descriptive statistics and qualitative content analysis, respectively. The results demonstrated that the 15-week GE-informed pedagogy significantly improved student views toward GE awareness. The students further reported that English should be viewed as a language serving varied communicative needs among different multilingual users and not just native users as target interlocutors. These results call for more GE-awareness pedagogical activities for a better understanding of the practical uses of English and in compliance with global linguistic diversifications. Article visualizations
- …