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1.
Macwan Richard Benezeth Yannick Mansouri Alamin 《Journal of Mathematical Imaging and Vision》2021,63(7):807-820
Journal of Mathematical Imaging and Vision - Remote photoplethysmography (rPPG) has been at the forefront recently, thanks to its capacity in estimating non-contact physiological parameters such as... 相似文献
2.
Chateau Marie-Elise Galet Laurence Soudais Yannick Fages Jacques 《Journal of surfactants and detergents》2004,7(4):355-362
A new test was developed to assess the efficiency of no-wiping hard-surface cleaning. The test allows cleaner comparisons
according to their ability to remove greasy soils. The chosen approach minimizes the mechanical forces applied while cleaning
so that the interactions between a detergent solution and the soil to be removed can be characterized. For this, immersion
cleaning was chosen, with coated stainless steel as substrate and pigmented oils as the model soil. Several parameters were
studied in defined ranges using the Experimental Design method and systematic comparisons. The test shows high reliability
on degreasing assessments and is there-fore especially suited to optimization of nonionic surfactant mixes. The originality
of the test lies in the possibility of keeping a visual trace of the cleaned substrate appearance by imprinting it on a piece
of paper. The validation of the test leads to corroboration of several practical observations. Temperature and agitation play
a major role in cleaning efficiency. Detergent solution concentration is a more relevant parameter than pH. Sodium carbonate
is shown to have a higher buffering effect than pentahydrated sodium metasilicate. The test is easy to set up, highly sensitive,
and can be adapted to solve the problems encountered by formulators of detergent cleaners, such as screening the best ethoxylated
fatty alcohol mix for better degreasing properties. 相似文献
3.
Yannick Schellander Marius Winter Maurice Schamber Fabian Munkes Patrick Schalberger Harald Kuebler Tilman Pfau Norbert Fruehauf 《Journal of the Society for Information Display》2023,31(5):363-372
In this work, real-time ultraviolet photodetectors are realized through metal–semiconductor–metal (MSM) structures. Amorphous indium gallium zinc oxide (a-IGZO) is used as semiconductor material and gold as metal electrodes. The readout of an individual sensor is implemented by a transimpedance amplifier (TIA) consisting of an all-enhancement a-IGZO thin-film transistor (TFT) operational amplifier and a switched capacitor (SC) as feedback resistance. The photosensor and the transimpedance amplifier are both manufactured on glass substrates. The measured photosensor possesses a high responsivity R , a low response time t R E S , and a good noise equivalent power value NEP . 相似文献
4.
Abnormality detection using low-level co-occurring events 总被引:1,自引:0,他引:1
Yannick Benezeth Pierre-Marc JodoinVenkatesh Saligrama 《Pattern recognition letters》2011,32(3):423-431
We propose in this paper a method for behavior modeling and abnormal events detection which uses low-level features. In conventional object-based approaches, objects are identified, classified, and tracked to locate those with suspicious behavior. We proceed directly with event characterization and behavior modeling using low-level features. We first learn statistics about co-occurring events in a spatio-temporal volume in order to build the normal behavior model, called the co-occurrence matrix. The notion of co-occurring events is defined using mutual information between motion labels sequences. Then, in the second phase, the co-occurrence matrix is used as a potential function in a Markov random field framework to describe, as the video streams in, the probability of observing new volumes of activity. The co-occurrence matrix is thus used for detecting moving objects whose behavior differs from the ones observed during the training phase. Interestingly, the Markov random field distribution implicitly accounts for speed, direction, as well as the average size of the objects without any higher-level intervention. Furthermore, when the spatio-temporal volume is sufficiently large, the co-occurrence distribution contains the average normal path followed by moving objects. Our method has been tested on various indoor and outdoor videos representing various challenges. 相似文献
5.
This paper introduces an accurate, efficient, and unified engine dedicated to dynamic animation of d-dimensional deformable objects. The objects are modelled as d-dimensional manifolds defined as functional combinations of a mesh of 3D control points, weighted by parametric blending
functions. This model ensures that, at each time step, the object shape conforms to its manifold definitions. The object motion
is deduced from the control points dynamic animation. In fact, control points should be viewed as the degrees of freedom of
the continuous object. The chosen dynamic equations (Lagrangian formalism) reflect this generic modelling scheme and yield
an exact and computationally efficient linear system. 相似文献
6.
Moussa Sofiane Karoui Yannick Deville Shahram Hosseini Abdelaziz Ouamri 《Pattern recognition》2012,45(12):4263-4278
Remote sensing has become an unavoidable tool for better managing our environment, generally by realizing maps of land cover using classification techniques. Traditional classification techniques assign only one class (e.g., water, soil, grass) to each pixel of remote sensing images. However, the area covered by one pixel contains more than one surface component and results in the mixture of these surface components. In such situations, classical classification is not acceptable for many major applications, such as environmental monitoring, agriculture, mineral exploration and mining, etc. Most methods proposed for treating this problem have been developed for hyperspectral images. On the contrary, there are very few automatic techniques suited to multispectral images. In this paper, we propose new unsupervised spatial methods (called 2D-Corr-NLS and 2D-Corr-NMF) in order to unmix each pixel of a multispectral image for better recognizing the surface components constituting the observed scene. These methods are related to the blind source separation (BSS) problem, and are based on sparse component analysis (SCA), clustering and non-negativity constraints. Our approach consists in first identifying the mixing matrix involved in this BSS problem, by using the first stage of a spatial correlation-based SCA method with very limited source sparsity constraints, combined with clustering. Non-negative least squares (NLS) or non-negative matrix factorization (NMF) methods are then used to extract spatial sources. An important advantage of our proposed methods is their applicability to the possibly globally underdetermined, but locally (over)determined BSS model in multispectral remote sensing images. Experiments based on realistic synthetic mixtures and real multispectral images collected by the Landsat ETM+ and the Formosat-2 sensors are performed to evaluate the performance of the proposed approach. We also show that our methods significantly outperform the sequential maximum angle convex cone (SMACC) method. 相似文献
7.
Francillette Yannick Boucher Eric Bier Nathalie Lussier Maxime Bouchard Kévin Belchior Patricia Gaboury Sébastien 《User Modeling and User-Adapted Interaction》2020,30(5):895-947
User Modeling and User-Adapted Interaction - Intelligent environments may improve the independence and quality of life of persons with mild cognitive impairment (MCI) or Alzheimer’s disease... 相似文献
8.
We give in this paper an alternative, and we believe simpler, proof of a deep result by Mathieu Baudet, namely that the equivalence
of symbolic constraints is decidable for deduction systems on a finite signature modulo a subterm convergent equational theory. 相似文献
9.
Yannick Hemberger Nadja Wichtner Christoph Berthold Klaus G. Nickel 《International Journal of Applied Ceramic Technology》2016,13(1):116-124
The relationship between Y2O3 content in tetragonal and cubic ZrO2 phases and the shift of the Raman band at ~645/cm was investigated. With increasing Y2O3 content, the 645/cm Raman band position decreases to lower Raman shift values. A fit of x = Y2O3 content in wt% and y = Raman band position in per cm, was found to be valid for low Y2O3‐stabilized t‐ZrO2, t′′‐ZrO2 transition, and fully stabilized c‐ZrO2. Modeling the change in lattice parameters due to the incorporation of Y2O3 in ZrO2 as obtained from Rietveld‐refined XRD data confirms that the peculiar sigmoidal form of the band shift with Y2O3 content is mainly due to a variation of the amount of oxygen vacancies. The resultant method is highly attractive in fields of Y2O3 determination in ZrO2 materials where a fast, spatially resolved, and nondestructive analysis is required. 相似文献
10.
Abir Masmoudi Fethi Bougares Mariem Ellouze Yannick Estève Lamia Belguith 《Language Resources and Evaluation》2018,52(1):249-267
Although Modern Standard Arabic is taught in schools and used in written communication and TV/radio broadcasts, all informal communication is typically carried out in dialectal Arabic. In this work, we focus on the design of speech tools and resources required for the development of an Automatic Speech Recognition system for the Tunisian dialect. The development of such a system faces the challenges of the lack of annotated resources and tools, apart from the lack of standardization at all linguistic levels (phonological, morphological, syntactic and lexical) together with the mispronunciation dictionary needed for ASR development. In this paper, we present a historical overview of the Tunisian dialect and its linguistic characteristics. We also describe and evaluate our rule-based phonetic tool. Next, we go deeper into the details of Tunisian dialect corpus creation. This corpus is finally approved and used to build the first ASR system for Tunisian dialect with a Word Error Rate of 22.6%. 相似文献