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241.
Jingli Lu Ruili Wang Liyanage C. De Silva 《International Journal of Speech Technology》2012,15(2):87-98
In this paper, we propose a set of automatic stress exaggeration methods that can enlarge the differences between stressed
and unstressed syllables. Our stress exaggeration methods can be used in computer-aided language learning systems to assist
second language learners perceive stress patterns. The intention of our automatic stress exaggeration methods is to support
hyper-pronunciation training which is commonly used in classrooms by teachers. In hyper-pronunciation training, exaggeration
is used to help learners increase their awareness of acoustic features and effectively apply these features into their pronunciation.
Duration, pitch and intensity have been claimed to be the main acoustic features that are closely related to stress in English
language. Thus, four stress exaggeration methods are proposed in this paper: (i) duration-based stress exaggeration, (ii)
pitch-based stress exaggeration, (iii) intensity-based stress exaggeration, and (iv) a combined stress exaggeration method
that integrates the duration-based, pitch-based and intensity-based exaggeration methods. Our perceptual experimental results
show that resynthesised stimuli by our proposed stress exaggerated methods can help learners of English as a Second Language
(ESL) better perceive English stress patterns significantly. 相似文献
242.
This paper studies the robustness problem of the min–max model predictive control (MPC) scheme for constrained nonlinear time‐varying delay systems subject to bounded disturbances. The notion of the input‐to‐state stability (ISS) of nonlinear time‐delay systems is introduced. Then by using the Lyapunov–Krasovskii method, a delay‐dependent sufficient condition is derived to guarantee input‐to‐state practical stability (ISpS) of the closed‐loop system by way of nonlinear matrix inequalities (NLMI). In order to lessen the online computational demand, the non‐convex min‐max optimization problem is then converted to a minimization problem with linear matrix inequality (LMI) constraints and a suboptimal MPC algorithm is provided. Finally, an example of a truck‐trailer is used to illustrate the effectiveness of the proposed results. Copyright © 2010 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society 相似文献
243.
Alejandro F. Villaverde Cesáreo Raimúndez Antonio Barreiro 《International Journal of Control, Automation and Systems》2012,10(1):78-87
Crane operation is a challenging task, due to the combined problem of obstacle avoidance and load swing suppression in underactuated
conditions. This paper presents a human-machine interface that increases the operator’s perception of a gantry crane’s workspace.
With this aim, a virtual environment resembling the workspace is connected with a haptic device. This allows the user to receive
not only visual but also tactile feedback, thus increasing maneuvering safety. Additionally, this capability is integrated
in a teleoperation setup, adopting a passivity-based control approach that guarantees overall stability. This includes also
the design of controllers by means of the IDA-PBC method. Experimental results carried out with a laboratory crane show its
feasibility for internet-based teleoperation and demonstrate the improvements on the system performance. 相似文献
244.
A rapidly solidified (Co, Fe)3O4 spinel was formed in a cobalt-iron-phosphate glass matrix by gas atomization of melts of composition 37.5% mol % CoO, 37.5%Fe2O3, 25% P2O5; and 40% CoO, 40% Fe2O3, 20% P2O5, and the material has been characterized using size analysis, X-ray diffraction, Mössbauer spectroscopy, and scanning electron microscopy with energy dispersive X-ray spectroscopy.In the 20 mol % P2O5 composition, atomized powder 50–100m in diameter contained 33 wt % (Co, Fe)3O4. The ferrite crystallized as randomly oriented, faceted dendrites parallel to 100, and the growth was apparently diffusion controlled. Unlike the ferrite, where iron is in both tetrahedral and octahedral coordination, the iron in the glassy matrix was predominantly in distorted octahedral coordination. Overall particle size distributions were broad (15–700m), with 50 wt % smaller than 200m. The maximum in the size distribution shifted from 150 to 80m on increasing the atomizing pressure from 7 to 20 bar (100 to 300 psi). Calculations have shown that the cooling rates obtained with oxide melts vary strongly with droplet size, and less strongly with melt temperature. 相似文献
245.
An evaluation was made of the use of bibliometric indicators for five disciplines in the humanities (social history, general linguistics, general literature, Dutch literature, and Dutch language) and three disciplines in the social and behavioural sciences (experimental psychology, anthropology, and public administration) in the Netherlands. Articles in journals were the predominant outlet in all disciplines. Monographs and popularizing articles were more important outlets in softer fields than in harder ones. The enlightenment function of scholarship was especially evident in Dutch literature and language, and public administration. Only some of the humanities disciplines are locally oriented. Although many publications were written in English, only experimental psychology, general linguistics, anthropology, and genrral literature were internationally oriented regarding output media. The impact of departments differed greatly both within and between disciplines. For all disciplines, bibliometric indicators are potentially useful for monitoring international impact, as expert interviews confirmed. Especially in Dutch language, Dutch literature and public administration, ISI-citation data are not very useful for monitoring national impact. 相似文献
246.
247.
A full profile X-ray powder diffraction structure refinement has been carried out on a sample of synthesized CuGaTe2 using graphite monocromatized CuK step-scan data and a profile shape of the Pearson VII type. The most satisfactory convergence was achieved at R
p = 0.0666, R
wp = 0.0884, R
B = 0.0106 and R
F = 0.0102. The derived structural parameters at 26.5°C are: a = 0.602348(7), c = 1.193979(2) nm and x(Te) = 0.256(6). The ratio between lattice parameters, = c/2a = 0.9911 (0), differs from 1.0, indicating a tetragonal distortion, and non-ideal anion displacements, x(Te)1/4, is manifested by the existence of bond alternation of Cu-Te and Ga-Te with interatomic distances of 0.262(5) and 0.2578(5) nm, respectively. These results show a light tetrahedral deformation produced by four-fold tetrahedra of the copper cation in the CuGaTe2 chalcopyrite-type structure. 相似文献
248.
A. J. De Koeijer 《Packaging Technology and Science》1992,5(1):17-20
The measurement of the relative humidity (RH) at high levels to the desired accuracy is still a problem, especially for levels above 90% RH. The reasons for this are:
- i The accuracy of the standard apparatus is lower at high RH than at moderate and low RH;
- ii The need for accurate measurement of the RH in moisture controlled rooms is greater at high RH than at lower RH, because for moisture sensitive products, such as fibreboard boxes and certain horticultural products, the influence of a minor deviation in RH on the properties of these products is considerably greater at high RH than at moderate and low RH.
249.
In this paper we introduce a new application of the sevenpinhole (7P) collimator: tomographic imaging of the thyroid. The collimator design has been reoptimized for this particular application by diminishing the distance from the collimator plate to the crystal and by choosing a smaller pinhole diameter. To reconstruct thyroid images from the two-dimensional projection data we use a method which we developed for 7P tomographic imaging of the heart [1]. Phantom experiments and patient studies demonstrate that this new device is capable of producing tomographic images of good quality and high resolution. Therefore, it seems to offer a promising alternative to conventional planar imaging of the thyroid (using a single-pinhole collimator). 相似文献
250.
Van Giessen JW Viergever MA De Graaf CN Dane HJ 《IEEE transactions on medical imaging》1986,5(4):222-228
In this paper, we discuss the applicability of a time-coded aperture system especially designed for thyroid tomography on the basis of phantom experiments. Our studies show that 1) the quality of the reconstructions is high (e.g., a cold spot of 6 mm diameter in a thyroid phantom can easily be detected), and 2) the reconstruction can be carried out in less than 11 min on a standard 16 bit minicomputer (HP1000). It is therefore concluded that the clinical potentiality of the device is good. 相似文献