Improvement of CSF based on a wide range of urban complex scenes

2018 ◽  
Author(s):  
Pu Bu ◽  
Yameng Li ◽  
Qi Chen ◽  
Chaokui Li
Keyword(s):  
Wide Range ◽  
Complex Scenes ◽  
Urban Complex

scholarly journals Research and Implementation of Real-time Render Optimization Algorithm Based on GPU

2021 ◽  
Vol 2136 (1) ◽  
pp. 012059
Author(s):  
Songlan Wang ◽  
Ji Zhang
Keyword(s):  
Computer Graphics ◽  
Large Scale ◽  
Continuous Optimization ◽  
Technology Application ◽  
Future Technology ◽  
Research And Innovation ◽  
Technical Requirements ◽  
Core Technology ◽  
Wide Range ◽  
Complex Scenes

Abstract In the continuous optimization of computer graphics, game engine and virtual reality have become the focus of research and innovation in the current technology field. Rendering is a core technology to show a variety of graphic effects, which has been attached great importance to and applied by the whole society. Nowadays, although the rendering of large-scale and complex scenes has a wide range of applications, the actual optimization requirements are very high. Therefore, in the future technology application and research and development, based on higher and higher technical requirements, it is necessary to improve the efficiency of actual rendering while ensuring or improving the rendering quality. Therefore, this paper studies how to use the algorithm to improve the efficiency of actual rendering, so as to provide a new basis for future computer graphics research.

scholarly journals PV neurons improve cortical complex scene analysis by enhancing timing-based coding

2021 ◽  
Author(s):  
Jian Carlo Nocon ◽  
Howard J Gritton ◽  
Nicholas M James ◽  
Xue Han ◽  
Kamal Sen
Keyword(s):  
Cognitive Abilities ◽  
Temporal Dynamics ◽  
Spatial Competition ◽  
Spike Timing ◽  
Scene Analysis ◽  
Cocktail Party ◽  
Complex Scene ◽  
Sensory Stimuli ◽  
Wide Range ◽  
Complex Scenes

Cortical representations underlying a wide range of cognitive abilities, which employ both rate and spike timing-based coding, emerge from underlying cortical circuits with a tremendous diversity of cell types. However, cell-type specific contributions to cortical coding are not well-understood. Here, we investigate the role of parvalbumin (PV) neurons in cortical complex scene analysis. Many complex scenes contain sensory stimuli, e.g., natural sounds, images, odors or vibrations, which are highly dynamic in time, competing with stimuli at other locations in space. PV neurons are thought to play a fundamental role in sculpting cortical temporal dynamics; yet their specific role in encoding complex scenes via timing-based codes, and the robustness of such temporal representations to spatial competition, have not been investigated. Here, we address these questions in auditory cortex using a cocktail party-like paradigm; integrating electrophysiology, optogenetic manipulations, and a family of novel spike-distance metrics, to dissect the contributions of PV neurons towards rate and timing-based coding. We find that PV neurons improve cortical discrimination of dynamic naturalistic sounds in a cocktail party-like setting by enhancing rapid temporal modulations in rate and spike timing reproducibility. Moreover, this temporal representation is maintained in the face of competing stimuli at other spatial locations, providing a robust code for complex scene analysis. These findings provide novel insights into the specific contributions of PV neurons in cortical coding of complex scenes.

The Green Revolution and Poverty in Northern Tamil Nadu: a Brief Synthesis of Village-Level Research in the Last Half-Century

2020 ◽  
Author(s):  
Barbara Harriss-White
Keyword(s):  
Common Core ◽  
Tamil Nadu ◽  
Green Revolution ◽  
Field Methods ◽  
Village Level ◽  
Wide Range ◽  
Market Town ◽  
Urban Complex ◽  
Village Level Studies ◽  
Analytical Approaches

Between 1972 and 2014, in Northern Tamil Nadu (NTN), India, the Green Revolution (GR) in agriculture was studied through five rounds of village-level studies (VLS). Over the decades, the number of villages dwindled; from 11, rigorously and randomly selected (together with a ‘Slater’ village first studied in 1916), through to a set of three villages in a rural–urban complex around a market town, to one of the original eleven, in the fifth round. During the reorganisation of districts in 1989, the villages sited on the Coromandel plain shifted administratively from North Arcot, a vanguard GR district, to Tiruvannamalai, described then as relatively backward. A wide range of concepts, disciplines, scales, field methods and analytical approaches were deployed to address i) a common core of questions about the economic and social implications of technological change in agriculture and ii) sets of other timely questions about rural development, which changed as the project lengthened. Among the latter was poverty.

Recent Applications of High Resolution Electron Microscopy to Crystalline Arrays of Virus Particles

1978 ◽  
Vol 36 (3) ◽  
pp. 470-482 ◽  
Author(s):  
R.W. Horne
Keyword(s):  
Electron Microscopy ◽  
Image Processing ◽  
Analytical Techniques ◽  
Staining Technique ◽  
High Resolution Electron Microscopy ◽  
Optical Diffraction ◽  
Full Potential ◽  
Virus Particles ◽  
Resolution Electron ◽  
Wide Range

The technique of surrounding virus particles with a neutralised electron dense stain was described at the Fourth International Congress on Electron Microscopy, Berlin 1958 (see Home & Brenner, 1960, p. 625). For many years the negative staining technique in one form or another, has been applied to a wide range of biological materials. However, the full potential of the method has only recently been explored following the development and applications of optical diffraction and computer image analytical techniques to electron micrographs (cf. De Hosier & Klug, 1968; Markham 1968; Crowther et al., 1970; Home & Markham, 1973; Klug & Berger, 1974; Crowther & Klug, 1975). These image processing procedures have allowed a more precise and quantitative approach to be made concerning the interpretation, measurement and reconstruction of repeating features in certain biological systems.

Microfabrication research at the National Submicron Facility

1983 ◽  
Vol 41 ◽  
pp. 86-89
Author(s):  
E.D. Wolf
Keyword(s):  
Integrated Circuits ◽  
Particle Physics ◽  
High Speed ◽  
New Technology ◽  
High Energy ◽  
High Energy Particle ◽  
New Science ◽  
Wide Range ◽  
Intermediate Domain ◽  
Circuit Function

Most microelectronics devices and circuits operate faster, consume less power, execute more functions and cost less per circuit function when the feature-sizes internal to the devices and circuits are made smaller. This is part of the stimulus for the Very High-Speed Integrated Circuits (VHSIC) program. There is also a need for smaller, more sensitive sensors in a wide range of disciplines that includes electrochemistry, neurophysiology and ultra-high pressure solid state research. There is often fundamental new science (and sometimes new technology) to be revealed (and used) when a basic parameter such as size is extended to new dimensions, as is evident at the two extremes of smallness and largeness, high energy particle physics and cosmology, respectively. However, there is also a very important intermediate domain of size that spans from the diameter of a small cluster of atoms up to near one micrometer which may also have just as profound effects on society as “big” physics.

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

Observation of Atom Rows in Thorium Pyromellitate Using a Field Emission STEM

1977 ◽  
Vol 35 ◽  
pp. 80-81
Author(s):  
H. Todokoro ◽  
S. Nomura ◽  
T. Komoda
Keyword(s):  
Field Emission ◽  
Amorphous Carbon ◽  
Carbon Film ◽  
Dark Field Image ◽  
Dark Field ◽  
Amorphous Carbon Film ◽  
Atomic Size ◽  
Wide Range ◽  
A Chain

It is interesting to observe polymers at atomic size resolution. Some works have been reported for thorium pyromellitate by using a STEM (1), or a CTEM (2,3). The results showed that this polymer forms a chain in which thorium atoms are arranged. However, the distance between adjacent thorium atoms varies over a wide range (0.4-1.3nm) according to the different authors.The present authors have also observed thorium pyromellitate specimens by means of a field emission STEM, described in reference 4. The specimen was prepared by placing a drop of thorium pyromellitate in 10-3 CH3OH solution onto an amorphous carbon film about 2nm thick. The dark field image is shown in Fig. 1A. Thorium atoms are clearly observed as regular atom rows having a spacing of 0.85nm. This lattice gradually deteriorated by successive observations. The image changed to granular structures, as shown in Fig. 1B, which was taken after four scanning frames.

Development of a conical anode Fe-gun for low voltage SEM

1988 ◽  
Vol 46 ◽  
pp. 978-979
Author(s):  
T. Miyokawa ◽  
S. Norioka ◽  
S. Goto
Keyword(s):  
High Resolution ◽  
Field Emission ◽  
Low Voltage ◽  
Irradiation Damage ◽  
Cold Cathode ◽  
Virtual Source ◽  
Source Position ◽  
Electrostatic Lens ◽  
Electrostatic Lenses ◽  
Wide Range

Field emission SEMs (FE-SEMs) are becoming popular due to their high resolution needs. In the field of semiconductor product, it is demanded to use the low accelerating voltage FE-SEM to avoid the electron irradiation damage and the electron charging up on samples. However the accelerating voltage of usual SEM with FE-gun is limited until 1 kV, which is not enough small for the present demands, because the virtual source goes far from the tip in lower accelerating voltages. This virtual source position depends on the shape of the electrostatic lens. So, we investigated several types of electrostatic lenses to be applicable to the lower accelerating voltage. In the result, it is found a field emission gun with a conical anode is effectively applied for a wide range of low accelerating voltages.A field emission gun usually consists of a field emission tip (cold cathode) and the Butler type electrostatic lens.

Comparison of Deterministic and Linear Cosine Spatial Filtering of Transmission Electron Micrographs

1972 ◽  
Vol 30 ◽  
pp. 596-597
Author(s):  
David A. Ansley
Keyword(s):  
Spherical Aberration ◽  
Focal Length ◽  
Chromatic Aberration ◽  
Spatial Filter ◽  
Operating Conditions ◽  
Objective Lens ◽  
List Type ◽  
Spatial Filters ◽  
Transmission Electron ◽  
Wide Range

The coherence of the electron flux of a transmission electron microscope (TEM) limits the direct application of deconvolution techniques which have been used successfully on unmanned spacecraft programs. The theory assumes noncoherent illumination. Deconvolution of a TEM micrograph will, therefore, in general produce spurious detail rather than improved resolution.A primary goal of our research is to study the performance of several types of linear spatial filters as a function of specimen contrast, phase, and coherence. We have, therefore, developed a one-dimensional analysis and plotting program to simulate a wide 'range of operating conditions of the TEM, including adjustment of the:(1) Specimen amplitude, phase, and separation(2) Illumination wavelength, half-angle, and tilt(3) Objective lens focal length and aperture width(4) Spherical aberration, defocus, and chromatic aberration focus shift(5) Detector gamma, additive, and multiplicative noise constants(6) Type of spatial filter: linear cosine, linear sine, or deterministic

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