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  • 1
    Online Resource
    Online Resource
    Limitations on estimation of effective scatterer diameters
    Acoustical Society of America (ASA) ; 2017
    In:  The Journal of the Acoustical Society of America Vol. 142, No. 6 ( 2017-12-01), p. 3677-3690
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 142, No. 6 ( 2017-12-01), p. 3677-3690
    Abstract: The influence of spatial diversity in acoustic scattering properties on estimates of the effective scatterer diameter (ESD) applied to soft biological tissues is investigated. This study is based on two-dimensional simulations of scattering media, beginning with random distributions of simple disk structures where all scattering features are known exactly. It concludes with an analysis of histology maps from healthy and fatty rabbit liver. Further, the liver histology is decomposed using an orthonormal basis to separate acoustic scattering at various spatial scales and observe how it influences ESD estimates. Overall, the goal is to quantitatively interpret ESD results for diagnostic assessments despite wide variations in tissue scatterer properties.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.5017602
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2017
    detail.hit.zdb_id: 1461063-2
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  • 2
    Online Resource
    Online Resource
    Computation of physiological human vocal fold parameters by mathematical optimization of a biomechanical model
    Acoustical Society of America (ASA) ; 2011
    In:  The Journal of the Acoustical Society of America Vol. 130, No. 2 ( 2011-08-01), p. 948-964
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 130, No. 2 ( 2011-08-01), p. 948-964
    Abstract: With the use of an endoscopic, high-speed camera, vocal fold dynamics may be observed clinically during phonation. However, observation and subjective judgment alone may be insufficient for clinical diagnosis and documentation of improved vocal function, especially when the laryngeal disease lacks any clear morphological presentation. In this study, biomechanical parameters of the vocal folds are computed by adjusting the corresponding parameters of a three-dimensional model until the dynamics of both systems are similar. First, a mathematical optimization method is presented. Next, model parameters (such as pressure, tension and masses) are adjusted to reproduce vocal fold dynamics, and the deduced parameters are physiologically interpreted. Various combinations of global and local optimization techniques are attempted. Evaluation of the optimization procedure is performed using 50 synthetically generated data sets. The results show sufficient reliability, including 0.07 normalized error, 96% correlation, and 91% accuracy. The technique is also demonstrated on data from human hemilarynx experiments, in which a low normalized error (0.16) and high correlation (84%) values were achieved. In the future, this technique may be applied to clinical high-speed images, yielding objective measures with which to document improved vocal function of patients with voice disorders.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.3605551
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2011
    detail.hit.zdb_id: 1461063-2
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  • 3
    Online Resource
    Online Resource
    Acoustic estimates of vowel centralization in persons who stutter
    Acoustical Society of America (ASA) ; 1997
    In:  The Journal of the Acoustical Society of America Vol. 101, No. 5_Supplement ( 1997-05-01), p. 3176-3176
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 101, No. 5_Supplement ( 1997-05-01), p. 3176-3176
    Abstract: The magnitude of tongue movement for fluently produced utterances of persons who stutter and those of normally fluent controls was inferred through examination of the vocal tract vowel space. Fifteen adult males served as subjects comprising separate groups of untreated stutterers, stutterers who had completed a fluency-shaping treatment program, and nonstuttering controls. The steady-state portion of formant one (F1) and formant two (F2) was examined in the production of various CVC tokens embedded in a carrier phrase. Average F1 and F2 values for |i|, |a|, and |u| were plotted in an F1−F2 vowel space triangle for each subject. The corresponding vowel space was measured by determining the area (Hz2) of the triangle. Results indicated the untreated group of persons who stutter had the smallest average vowel space, while the largest vowel space was observed in the control group. Discussion focuses on the vocal tract articulation characterizing fluent speech production.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.419154
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1997
    detail.hit.zdb_id: 1461063-2
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  • 4
    Online Resource
    Online Resource
    A study of sentence stress production in Mandarin speakers of American English
    Acoustical Society of America (ASA) ; 2001
    In:  The Journal of the Acoustical Society of America Vol. 109, No. 4 ( 2001-04-01), p. 1681-1690
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 109, No. 4 ( 2001-04-01), p. 1681-1690
    Abstract: Acoustic characteristics of American English sentence stress produced by native Mandarin speakers are reported. Fundamental frequency (F0), vowel duration, and vowel intensity in the sentence-level stress produced by 40 Mandarin speakers were compared to those of 40 American English speakers. Results obtained from two methods of stress calculation indicated that Mandarin speakers of American English are able to differentiate stressed and unstressed words according to features of F0, duration, and intensity. Although the group of Mandarin speakers were able to signal stress in their sentence productions, the acoustic characteristics of stress were not identical to the American speakers. Mandarin speakers were found to produce stressed words with a significantly higher F0 and shorter duration compared to the American speakers. The groups also differed in production of unstressed words with Mandarin speakers using a higher F0 and greater intensity compared to American speakers. Although the acoustic differences observed may reflect an interference of L1 Mandarin in the production of L2 American English, the outcome of this study suggests no critical divergence between these speakers in the way they implement American English sentence stress.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.1356023
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2001
    detail.hit.zdb_id: 1461063-2
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  • 5
    Online Resource
    Online Resource
    Relationship between salinity of the liquid and shell composition on the resonance frequency of the C3F8 lipid coated microbubbles
    Acoustical Society of America (ASA) ; 2021
    In:  The Journal of the Acoustical Society of America Vol. 150, No. 4_Supplement ( 2021-10-01), p. A29-A29
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 150, No. 4_Supplement ( 2021-10-01), p. A29-A29
    Abstract: Lipid-coated microbubbles (MBs) are used in contrast-enhanced ultrasound (CEUS) imaging and MB enhanced therapeutic ultrasound (US). Understanding the MB behavior and the influence of the surrounding medium on its response to the US is necessary to select the suitable US exposure parameters. The MB lipid coating is often charged, however the influence of the ions in the medium on MB behavior is not fully understood. In this work, the influence of the medium salinity on the pressure-dependent MB behavior is investigated for the first time. MBs of different lipid shell compositions are size isolated to achieve the same size distribution. The MBs linear and pressure-dependent attenuation are measured in deionized water, PBS 1×, PBS 2×, and PBS 10× using a system of aligned PVDF 100% bandwidth transducers with a center frequency of 10 MHz and exposures with peak to peak pressure range of 3–140 kPa. With increasing salinity, the linear resonance frequency decreases up to 50% for conventional lipid shell compositions, and the pressure dependence of the resonance frequency is inhibited. By modifying the shell PEG ratio, the salinity effects can significantly be altered. Moreover, the nonlinear pressure-dependent resonance frequency is restored with applications to increased CEUS.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/10.0007512
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2021
    detail.hit.zdb_id: 1461063-2
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  • 6
    Online Resource
    Online Resource
    Project-based learning through sensor characterization in a musical acoustics course
    Acoustical Society of America (ASA) ; 2022
    In:  The Journal of the Acoustical Society of America Vol. 152, No. 3 ( 2022-09-01), p. 1932-1941
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 152, No. 3 ( 2022-09-01), p. 1932-1941
    Abstract: Project-based learning engages students in practical activities related to course content and has been demonstrated to improve academic performance. Due to its reported benefits, this form of active learning was incorporated with an ongoing research project into an introductory, graduate-level Musical Acoustics course at the Peabody Institute of The Johns Hopkins University. Students applied concepts from the course to characterize a contact sensor with a polymer diaphragm for musical instrument recording. Assignments throughout the semester introduced students to completing a literature review, planning an experiment, collecting and analyzing data, and presenting results. While students were given broad goals to understand the performance of the contact sensor compared to traditional microphones, they were allowed independence in determining the specific methods used. The efficacy of the course framework and research project was assessed with student feedback provided through open-ended prompts and Likert-type survey questions. Overall, the students responded positively to the project-based learning and demonstrated mastery of the course learning objectives. The work provides a possible framework for instructors considering using project-based learning through research in their own course designs.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/10.0014171
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2022
    detail.hit.zdb_id: 1461063-2
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  • 7
    Online Resource
    Online Resource
    Phonological Assimilation and Visual Word Recognition
    Springer Science and Business Media LLC ; 2006
    In:  Journal of Psycholinguistic Research Vol. 35, No. 6 ( 2006-11-21), p. 513-530
    Details
    In: Journal of Psycholinguistic Research, Springer Science and Business Media LLC, Vol. 35, No. 6 ( 2006-11-21), p. 513-530
    Type of Medium: Online Resource
    ISSN: 0090-6905 , 1573-6555
    URL: Article
    DOI: 10.1007/s10936-006-9027-6
    RVK:
    EQ 1000
    RVK:
    EQ 2695
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2006
    detail.hit.zdb_id: 2017227-8
    SSG: 5,2
    SSG: 7,11
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  • 8
    Online Resource
    Online Resource
    Developing literacy or focusing on interaction: New Zealand students’ strategic efforts related to Chinese language learning during study abroad in China
    Elsevier BV ; 2021
    In:  System Vol. 98 ( 2021-06), p. 102462-
    Details
    In: System, Elsevier BV, Vol. 98 ( 2021-06), p. 102462-
    Type of Medium: Online Resource
    ISSN: 0346-251X
    URL: Article
    DOI: 10.1016/j.system.2021.102462
    RVK:
    EQ 1000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
    detail.hit.zdb_id: 1500775-3
    detail.hit.zdb_id: 189289-7
    SSG: 7,11
    SSG: 5,3
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  • 9
    Online Resource
    Online Resource
    Prediction of sound transmission through, and radiation from, panels using a wave and finite element method
    Acoustical Society of America (ASA) ; 2017
    In:  The Journal of the Acoustical Society of America Vol. 141, No. 4 ( 2017-04-01), p. 2452-2460
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 141, No. 4 ( 2017-04-01), p. 2452-2460
    Abstract: This paper describes the extension of a wave and finite element (WFE) method to the prediction of noise transmission through, and radiation from, infinite panels. The WFE method starts with a conventional finite element model of a small segment of the panel. For a given frequency, the mass and stiffness matrices of the segment are used to form the structural dynamic stiffness matrix. The acoustic responses of the fluids surrounding the structure are modelled analytically. The dynamic stiffness matrix of the segment is post-processed using periodic structure theory, and coupled with those of the fluids. The total dynamic stiffness matrix is used to obtain the response of the medium to an incident acoustic pressure. Excitation of the structure by oblique plane waves and a diffuse sound field are considered. The response to structural excitation and the consequent radiation are determined. Since the size of the WFE model is small, computational times are small. Various example applications are presented to illustrate the approach, including a thin isotropic panel, an antisymmetric, cross-ply sandwich panel and a symmetric panel with an orthotropic core.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4977925
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2017
    detail.hit.zdb_id: 1461063-2
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  • 10
    Online Resource
    Online Resource
    Comparison of binaural beamformers for speech extraction in complex auditory scenes
    Acoustical Society of America (ASA) ; 2001
    In:  The Journal of the Acoustical Society of America Vol. 109, No. 5_Supplement ( 2001-05-01), p. 2494-2494
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 109, No. 5_Supplement ( 2001-05-01), p. 2494-2494
    Abstract: The goal of this study was to assess and compare the capacities of several array-processing algorithms to extract on-axis signals in the presence of one or more off-axis interferers. Performance comparisons are made between the localization/extraction (L/E) algorithm [Liu et al., J. Acoust. Soc. Am. 108, 1888–1905 (2000)], the frequency-banded minimum-variance beamformer (FBMVB) [Lockwood et al., J. Acoust. Soc. Am. 106, 2278 (1999)] , the Frost beamformer, the Griffiths–Jim generalized sidelobe canceller (GSC), and the Peissig–Kollmeier (P-K) algorithm [Kollmeier et al., J. Rehab. Res. Dev. 30, 82–94 (1993)]. The two metrics used to evaluate algorithm performance were the signal-to-noise ratio gain (SNRG) and the intelligibility-weighted signal-to-noise ratio gain (IWSNRG). The signals used simulated an omnidirectional microphone array in free field and were composed of sentence-length speech by male and female speakers against a background of one to four interfering sound sources. Overall, the IWSNRGs for the L/E and FBMVB algorithms were similar to those for the Frost, GSC, and P-K algorithms when there was a single interferer, but 3–4 dB higher when there were two or more interferers. This study shows that FBMVB and L/E algorithms hold promise for hearing aids to be used in noisy environments. [Work supported by NIH-NIDCD Grant R21DC04840.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4744876
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2001
    detail.hit.zdb_id: 1461063-2
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