186 research outputs found
The use of speaker correlation information for automatic speech recognition
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.Includes bibliographical references (p. 171-179).by Timothy J. Hazen.Ph.D
On the Social and Technical Challenges of Web Search Autosuggestion Moderation
Past research shows that users benefit from systems that support them in
their writing and exploration tasks. The autosuggestion feature of Web search
engines is an example of such a system: It helps users in formulating their
queries by offering a list of suggestions as they type. Autosuggestions are
typically generated by machine learning (ML) systems trained on a corpus of
search logs and document representations. Such automated methods can become
prone to issues that result in problematic suggestions that are biased, racist,
sexist or in other ways inappropriate. While current search engines have become
increasingly proficient at suppressing such problematic suggestions, there are
still persistent issues that remain. In this paper, we reflect on past efforts
and on why certain issues still linger by covering explored solutions along a
prototypical pipeline for identifying, detecting, and addressing problematic
autosuggestions. To showcase their complexity, we discuss several dimensions of
problematic suggestions, difficult issues along the pipeline, and why our
discussion applies to the increasing number of applications beyond web search
that implement similar textual suggestion features. By outlining persistent
social and technical challenges in moderating web search suggestions, we
provide a renewed call for action.Comment: 17 Pages, 4 images displayed within 3 latex figure
Open-vocabulary spoken utterance retrieval using confusion networks
This paper presents a novel approach to open-vocabulary spoken utterance retrieval using confusion networks. If out-of-vocabulary (OOV) words are present in queries and the corpus, word-based indexing will not be sufficient. For this problem, we apply phone confusion networks and combine them with word confusion networks. With this approach, we can generate a more compact index table that enables robust keyword matching compared with typical lattice-based methods. In the retrieval experiments with speech recordings in MIT lecture corpus, our method using phone confusion networks outperformed lattice-based methods especially for OOV queries
Discriminative Training for Large-Vocabulary Speech Recognition Using Minimum Classification Error
Period and chemical evolution of SC stars
The SC and CS stars are thermal-pulsing AGB stars with C/O ratio close to
unity. Within this small group, the Mira variable BH Cru recently evolved from
spectral type SC (showing ZrO bands) to CS (showing weak C2). Wavelet analysis
shows that the spectral evolution was accompanied by a dramatic period
increase, from 420 to 540 days, indicating an expanding radius. The pulsation
amplitude also increased. Old photographic plates are used to establish that
the period before 1940 was around 490 days. Chemical models indicate that the
spectral changes were caused by a decrease in stellar temperature, related to
the increasing radius. There is no evidence for a change in C/O ratio. The
evolution in BH Cru is unlikely to be related to an on-going thermal pulse.
Periods of the other SC and CS stars, including nine new periods, are
determined. A second SC star, LX Cyg, also shows evidence for a large increase
in period, and one further star shows a period inconsistent with a previous
determination. Mira periods may be intrinsically unstable for C/O ~ 1; possibly
because of a feedback between the molecular opacities, pulsation amplitude, and
period. LRS spectra of 6 SC stars suggest a feature at wavelength > 15 micron,
which resembles one recently attributed to the iron-sulfide troilite. Chemical
models predict a large abundance of FeS in SC stars, in agreement with the
proposed association.Comment: 14 pages, 20 figures. MNRAS, 2004, accepted for publication. Janet
Mattei, one of the authors, died on 22 March, 2004. This paper is dedicated
to her memor
Wild Blueberries 1999 CSREES Progress Reports
The 1999 edition of the Wild Blueberries CSREES Progress Reports was prepared for the Maine Blueberry Commission and the University of Maine Blueberry Advisory Committee by researchers at the University of Maine, Orono. Projects in this report include:
1. Effects of QF Processing on Microbiological Quality of Maine Wild Blueberries
2. Separation of Maggot-Infested Blueberries in the IQF Processing Line
3. Determination of Pesticide Residue Levels in Fresh and Processed Wild Blueberries
4. Control Tactics for Blueberry Pest Insects
5. IPM Strategies
6. Biology and Ecology of Blueberry Pest Insects
7. Survey of Stem Blight and Leaf Spot Diseases in Lowbush Blueberry Fields
8. Phosphorus/Nitrogen Fertilizer Ratio
9. Effect of Fertilizer Timing on Lowbush Blueberry Growth and Productivity
10. Effect of Soil pH on Nutrient Uptake
11. Effect of Boron Application Methods on Boron Uptake in Lowbush Blueberries
12. Effect of Nutri-Phite P+K on growth and yield of lowbush blueberry
13. Effect of Crop-Set on growth and yield of lowbush blueberry
14. Crop year fertilization of lowbush blueberry
15. Alternative Methods of Grass Control
16. Cultural Weed Management Using pH
17. Investigation of Hexazinone Alternatives for Weed Control
18. Comparison of Sulfosate and Glyphosate for Weed Control
19. Evaluation of VC1447 for Weed Control in Wild blueberries
20. Blueberry/ Cranberry Extension Education Program in 1999
21. Effect of Rate, Formulation and Application Method on Efficacy and Phytotoxicity of Granular Hexazinone in Wild Blueberry Fields
22. 1999 Fungicide Evaluation Field Trial
23. 1999 Hexazinone Groundwater Survey Pollination
24. Sustainable Pollination of Wild Blueberr
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