scholarly journals First freshwater coralline alga and the role of local features in a major biome transition

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
A. Žuljević ◽  
S. Kaleb ◽  
V. Peña ◽  
M. Despalatović ◽  
I. Cvitković ◽  
...  
Keyword(s):  
Local Features ◽  
Coralline Alga

scholarly journals The Role of Global Appearance of Omnidirectional Images in Relative Distance and Orientation Retrieval

Sensors ◽  
2021 ◽  
Vol 21 (10) ◽  
pp. 3327
Author(s):  
Vicente Román ◽  
Luis Payá ◽  
Adrián Peidró ◽  
Mónica Ballesta ◽  
Oscar Reinoso
Keyword(s):  
Mobile Robotics ◽  
A Priori ◽  
Computational Cost ◽  
Relevant Information ◽  
Local Features ◽  
New Family ◽  
Lighting Conditions ◽  
Omnidirectional Images ◽  
Great Development

Over the last few years, mobile robotics has experienced a great development thanks to the wide variety of problems that can be solved with this technology. An autonomous mobile robot must be able to operate in a priori unknown environments, planning its trajectory and navigating to the required target points. With this aim, it is crucial solving the mapping and localization problems with accuracy and acceptable computational cost. The use of omnidirectional vision systems has emerged as a robust choice thanks to the big quantity of information they can extract from the environment. The images must be processed to obtain relevant information that permits solving robustly the mapping and localization problems. The classical frameworks to address this problem are based on the extraction, description and tracking of local features or landmarks. However, more recently, a new family of methods has emerged as a robust alternative in mobile robotics. It consists of describing each image as a whole, what leads to conceptually simpler algorithms. While methods based on local features have been extensively studied and compared in the literature, those based on global appearance still merit a deep study to uncover their performance. In this work, a comparative evaluation of six global-appearance description techniques in localization tasks is carried out, both in terms of accuracy and computational cost. Some sets of images captured in a real environment are used with this aim, including some typical phenomena such as changes in lighting conditions, visual aliasing, partial occlusions and noise.

scholarly journals The role of chitin-rich skeletal organic matrix on the crystallization of calcium carbonate in the crustose coralline alga Leptophytum foecundum

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
M. Azizur Rahman ◽  
Jochen Halfar ◽  
Walter H. Adey ◽  
Merinda Nash ◽  
Carlos Paulo ◽  
...  
Keyword(s):  
Calcium Carbonate ◽  
Organic Matrix ◽  
Crustose Coralline Alga ◽  
Coralline Alga

The Role of Music in the Shadow Play "Hacivat and Karagöz"

2014 ◽  
Vol 2 (1) ◽  
pp. 64
Author(s):  
Ayhan Helvacı
Keyword(s):  
Folk Music ◽  
Classical Music ◽  
Local Features ◽  
Shadow Play ◽  
The Voice

The shadow play Hacivat and Karagöz has become an important part of the Traditional Turkish Theatre continuing for centuries. The existing shadow play which still preserves its popularity has become a significant entertainment tool for people. According to the local features of the performed characters and the content of the topic, this art type carried out by reflecting on a screen specially designed puppets from behind a lightened curtain and by playing with the voice of the performer has various music types and its instruments, especially Turkish folk music and Turkish classical music. in this study, within the play, the role of the music which is thought to form an important part of the shadow play was researched and the music and instruments used were analysed. The effect and role of the music within the play was particularly tried to be put forward.

scholarly journals Recognising the Usual Orientation of One's Own Face: The Role of Asymmetrically Located Details

Perception ◽  
10.1068/p3354 ◽  
2003 ◽  
Vol 32 (7) ◽  
pp. 805-811 ◽  
Author(s):  
Serge Brédart
Keyword(s):  
Local Features ◽  
The Other ◽  
Configural Information ◽  
Familiar Face ◽  
Horizontal Orientation ◽  
Normal Orientation ◽  
Facial Configuration

Our ability to recognise the usual horizontal orientation of our own face (mirror orientation) as compared with another very familiar face (normal orientation) was examined in experiment 1. Participants did not use the same kind of information in determining the orientation of their own face as in determining the orientation of the other familiar face. The proportion of participants who reported having based their judgment on the location of an asymmetric feature (eg a mole) was higher when determining the orientation of their own face than when determining that of the other familiar face. In experiment 2, participants were presented with pairs of manipulated images of their own face and of another familiar face showing conflicting asymmetric features and configural information. Each pair consisted of one picture showing asymmetric features of a given face in a mirror-reversed position, while the facial configuration was left unchanged; and one picture in which the location of the asymmetric features was left unchanged, while the facial configuration was mirror-reversed. As expected from the hypothesis that asymmetric local features are more frequently used for the judgment of one's own face, participants chose the picture showing mirror-reversed asymmetric features when determining the usual orientation of their own face significantly more often than they chose the picture showing normally oriented asymmetric features when determining the orientation of the other face. These results are explained in terms of competing forward and mirror-reversed representations of one's own face.

scholarly journals The Case of Anti-Soviet Baptist Group in Shchuchye-Ozersk District of Perm region: an Ethno-Confessional Aspect of Mass Operations in 1937-1938

TECHNOLOGOS ◽  
2021 ◽  
pp. 46-54
Author(s):  
Koldushko Anna
Keyword(s):  
Analytical Methods ◽  
Local Features ◽  
Historical Science ◽  
Present Stage ◽  
Internal Logic ◽  
Stage Of Development ◽  
Natural Factors ◽  
Historical Comparative ◽  
Perm Region

Mass repressive operations of the 1930s are really remained one of the most relevant topics for research. At the present stage of development of historical science, key attention is paid to the direction of mass operations of the 1930s-Kulak, national lines (Polish, German, etc.), and the identification of local features of their realization. Recently, historians have paid great attention to the implementation of the internal logic and mechanisms of mass repressive actions. We can say that the focus of research is shifting to the micro-historical field: to individuals who suffered from repression, to small settlements in which arrests were especially widespread. This approach allows us to see important details and features which could not be found in the generalized works devoted to mass operations of the 1930s: distortions of central directives on the ground, the influence of local specifics, and so on. In this study the author has made an attempt to determine and analyze the specifics of ethno-confessional aspect of mass operations by the example of the case of the anti-Soviet Baptist group in the Shchuchye-Ozersk district of Perm region. The aim of the work was to identify and analyze the directions of repressive actions by the example of this case, to study the role of ethnic and confessional factors in the course of mass operations in places of compact residence of Germans. Both narrative and traditional analytical methods were used as methodological tools of the research: historical-genetic, historical-comparative, historicaltypological. The main sources the author relied on were the written ones which were included in archival and investigative cases: questionnaires of arrested persons, interrogation protocols, indictments, materials of court sessions, etc. As a result, the author identified several areas, or storylines, of the case of the anti-Soviet Baptist group in Shchuchye-Ozersk district of Perm region: espionage, Kulak, ethnic and confessional; the internal logic of the case was reconstructed, it has been shown as accusation accents shifted due to the influence of political conjuncture, also the author has mentioned the influence of natural factors on the outcome of the trial.

scholarly journals Figure and ground: how the visual cortex integrates local cues for global organization

2018 ◽  
Vol 120 (6) ◽  
pp. 3085-3098 ◽  
Author(s):  
Rüdiger von der Heydt ◽  
Nan R. Zhang
Keyword(s):  
Visual Cortex ◽  
Cell Activity ◽  
Local Features ◽  
Natural Scenes ◽  
Single Feature ◽  
Proposed Model ◽  
Highly Nonlinear ◽  
Global Organization ◽  
Definition Of

Inferring figure-ground organization in two-dimensional images may require different complementary strategies. For isolated objects, it has been shown that mechanisms in visual cortex exploit the overall distribution of contours, but in images of cluttered scenes where the grouping of contours is not obvious, that strategy would fail. However, natural scenes contain local features, specifically contour junctions, that may contribute to the definition of object regions. To study the role of local features in the assignment of border ownership, we recorded single-cell activity from visual cortex in awake behaving Macaca mulatta. We tested configurations perceived as two overlapping figures in which T- and L-junctions depend on the direction of overlap, whereas the overall distribution of contours provides no valid information. While recording responses to the occluding contour, we varied direction of overlap and variably masked some of the critical contour features to determine their influences and their interactions. On average, most features influenced the responses consistently, producing either enhancement or suppression depending on border ownership. Different feature types could have opposite effects even at the same location. Features far from the receptive field produced effects as strong as near features and with the same short latency. Summation was highly nonlinear: any single feature produced more than two-thirds of the effect of all features together. These findings reveal fast and highly specific organization mechanisms, supporting a previously proposed model in which “grouping cells” integrate widely distributed edge signals with specific end-stopped signals to modulate the original edge signals by feedback. NEW & NOTEWORTHY Seeing objects seems effortless, but defining objects in a scene requires sophisticated neural mechanisms. For isolated objects, the visual cortex groups contours based on overall distribution, but this strategy does not work for cluttered scenes. Here, we demonstrate mechanisms that integrate local contour features like T- and L-junctions to resolve clutter. The process is fast, evaluates widely distributed features, and gives any single feature a decisive influence on figure-ground representation.

scholarly journals Tulip In The Culture Of Uzbek People

2020 ◽  
Vol 2 (04) ◽  
pp. 6-16
Author(s):  
Adhamjon Ashirov
Keyword(s):  
Everyday Life ◽  
Central Asia ◽  
Folk Art ◽  
Local Features ◽  
Symbolic Meanings

On the basis of ethnographic materials this article examines the worldview of Uzbeks living in Central Asia and the role of the tulip plant in everyday life of the Uzbeks. The author analyzes the history, genesis and local features of the spring holidays "Lola Sayli" (Tulip Festivity) and "Boychechak Sayli"(Snowdrop Festivity) that are held in Uzbekistan and Tajikistan. Also, new scientific views on the image of the tulip and its symbolic meanings in the popular folk art of the region, especially in the national suzannas, were expressed.

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