scholarly journals Multi-objective evolutionary method for cargo arrangement in a loading space

2017 ◽  
Vol 44 (4) ◽  
pp. 65-74 ◽  
Author(s):  
Michał Taraska ◽  
Remigiusz Iwańkowicz
Keyword(s):  
Dimensional Space ◽  
Three Dimensional ◽  
Point Of View ◽  
Acceptable Solution ◽  
Strong Base ◽  
Current Form ◽  
Advantages And Disadvantages ◽  
Current State ◽  
Three Dimensional Space

The paper characterises a class of problems for packing boxes in the container. It presents the current state of knowledge in this area and distinguishes evolutionary algorithms, as the most promising in the search for quasi-optimal loading conditions. The method proposed in the paper focuses on certain criteria important from a practical point of view, which in a formalised manner have not been included so far in the solving-problems models. Apart from the traditional consideration of the problem of three-dimensional space loading maximisation, the proposed method considers the deviation of the loaded container weight centre from its symmetry planes and the availability of packages during unloading. New elements in the described method are: the applied criteria, penalty function, way of coding the container loading state in the evolutionary algorithm and fast crossover and mutations operators dedicated to the adopted coding. It was observed that the evolution in the developed algorithm occurs properly, that is seeking to minimise the criteria. The article also includes a calculation example showing the effect of the method with the discussion of the results indicating the advantages and disadvantages of the proposed solution. The performance of the algorithm has been considered in the context of time necessary to obtain the acceptable solution and quality of the obtained solution. It was found that the algorithm in its current form is a strong base for its further improvement.

scholarly journals How Can I Grab That?

i-com ◽  
2020 ◽  
Vol 19 (2) ◽  
pp. 67-85
Author(s):  
Matthias Weise ◽  
Raphael Zender ◽  
Ulrike Lucke
Keyword(s):  
Virtual Reality ◽  
User Experience ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Advantages And Disadvantages ◽  
Multiple Dimensions ◽  
Application Developers ◽  
Three Dimensional Space

AbstractThe selection and manipulation of objects in Virtual Reality face application developers with a substantial challenge as they need to ensure a seamless interaction in three-dimensional space. Assessing the advantages and disadvantages of selection and manipulation techniques in specific scenarios and regarding usability and user experience is a mandatory task to find suitable forms of interaction. In this article, we take a look at the most common issues arising in the interaction with objects in VR. We present a taxonomy allowing the classification of techniques regarding multiple dimensions. The issues are then associated with these dimensions. Furthermore, we analyze the results of a study comparing multiple selection techniques and present a tool allowing developers of VR applications to search for appropriate selection and manipulation techniques and to get scenario dependent suggestions based on the data of the executed study.

Using Online Panels in Psychological Research

2012 ◽  
Author(s):  
Anja S. Göritz
Keyword(s):  
Longitudinal Study ◽  
Psychological Research ◽  
Point Of View ◽  
Quality Of Data ◽  
Cross Sectional ◽  
Web Based ◽  
Advantages And Disadvantages ◽  
Current State ◽  
Online Panels

Online panels (OPs) are an important form of web-based data collection, as illustrated by their widespread use. In the classical sense, a panel is a longitudinal study in which the same information is collected from the same individuals at different points in time. In contrast to that, an OP has come to denote a pool of registered people who have agreed to occasionally take part in web-based studies. Thus with OPs, the traditional understanding of a panel as a longitudinal study is broadened because an OP can be employed as a sampling source for both longitudinal and cross-sectional studies. This article gives an overview of the current state of use of OPs. It discusses what OPs are, what type of OPs there are, how OPs work from a technological point of view, and what their advantages and disadvantages are. The article reviews the current body of methodological findings on doing research with OPs. Based on this evidence, recommendations are given as to how the quality of data that are collected in OPs can be augmented.

scholarly journals USING AUTOCAD AUTODESK AND AUTODESK INVENTOR GRAPHIC EDITORS AS DESIGN TOOLS IN 3D CAD

2021 ◽  
Vol 2021 (1) ◽  
pp. 7-14
Author(s):  
Arailym Ardakkyzy Amangeldiyeva ◽  
Altynai Tulparovna Kishubayeva
Keyword(s):  
Dimensional Space ◽  
Three Dimensional ◽  
Parametric Modeling ◽  
Design Tools ◽  
Traditional Methods ◽  
3D Cad ◽  
Advantages And Disadvantages ◽  
Computer Visualization ◽  
Drawing Board ◽  
Three Dimensional Space

Initially, the computers and software were supposed to complement the engineer’s traditional techniques, replacing the drawing board and calculator. Today, the computers with spe-cialized software almost completely replace the traditional methods. There is given an overview of the graphic editors AutoCAD Autodesk and Autodesk Inventor, possibilities of performing designs in three-dimensional space using parametric modeling. The advantages and disadvantages of each program are analyzed. An example of using AutoCAD Autodesk and Autodesk Inventor for computer visualization of a 3D object is given. To evaluate the work in both programs, 13 users were involved, who noted the ease of mastering AutoCAD Autodesk, which is important for the young engineers, as well as for the students.

scholarly journals Ideals of Herzog–Northcott type

2011 ◽  
Vol 54 (1) ◽  
pp. 161-186 ◽  
Author(s):  
Liam O'Carroll ◽  
Francesc Planas-Vilanova
Keyword(s):  
Dimensional Space ◽  
Three Dimensional ◽  
Regular Sequence ◽  
Point Of View ◽  
Prime Ideals ◽  
Monomial Curves ◽  
Definition Of ◽  
Minimal Prime ◽  
Special Case ◽  
Three Dimensional Space

AbstractThis paper takes a new look at ideals generated by 2×2 minors of 2×3 matrices whose entries are powers of three elements not necessarily forming a regular sequence. A special case of this is the ideals determining monomial curves in three-dimensional space, which were studied by Herzog. In the broader context studied here, these ideals are identified as Northcott ideals in the sense of Vasconcelos, and so their liaison properties are displayed. It is shown that they are set-theoretically complete intersections, revisiting the work of Bresinsky and of Valla. Even when the three elements are taken to be variables in a polynomial ring in three variables over a field, this point of view gives a larger class of ideals than just the defining ideals of monomial curves. We then characterize when the ideals in this larger class are prime, we show that they are usually radical and, using the theory of multiplicities, we give upper bounds on the number of their minimal prime ideals, one of these primes being a uniquely determined prime ideal of definition of a monomial curve. Finally, we provide examples of characteristic-dependent minimal prime and primary structures for these ideals.

scholarly journals Perceptually Valid Facial Expressions for Character-Based Applications

2009 ◽  
Vol 2009 ◽  
pp. 1-13 ◽  
Author(s):  
Ali Arya ◽  
Steve DiPaola ◽  
Avi Parush
Keyword(s):  
Facial Expression ◽  
Language Learning ◽  
Facial Expressions ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Point Of View ◽  
Mixed Emotions ◽  
Dynamic Facial Expressions ◽  
Emotion Model ◽  
Three Dimensional Space

This paper addresses the problem of creating facial expression of mixed emotions in a perceptually valid way. The research has been done in the context of a “game-like” health and education applications aimed at studying social competency and facial expression awareness in autistic children as well as native language learning, but the results can be applied to many other applications such as games with need for dynamic facial expressions or tools for automating the creation of facial animations. Most existing methods for creating facial expressions of mixed emotions use operations like averaging to create the combined effect of two universal emotions. Such methods may be mathematically justifiable but are not necessarily valid from a perceptual point of view. The research reported here starts by user experiments aiming at understanding how people combine facial actions to express mixed emotions, and how the viewers perceive a set of facial actions in terms of underlying emotions. Using the results of these experiments and a three-dimensional emotion model, we associate facial actions to dimensions and regions in the emotion space, and create a facial expression based on the location of the mixed emotion in the three-dimensional space. We call these regionalized facial actions “facial expression units.”

scholarly journals THE SANSEVERO CHAPEL, A THREE-DIMENSIONAL POINT OF VIEW

2019 ◽  
Vol XLII-2/W15 ◽  
pp. 299-304
Author(s):  
V. Cera ◽  
D. Marcos González ◽  
L. A. Garcia
Keyword(s):  
Dimensional Space ◽  
Three Dimensional ◽  
Point Of View ◽  
Two Dimensional ◽  
Dimensional Representation ◽  
Survey Techniques ◽  
Representation Systems ◽  
Representation Of Space ◽  
Special Relevance ◽  
Three Dimensional Space

<p><strong>Abstract.</strong> In this article, the importance of the three-dimensional survey in architectural spaces will be studied, taking special relevance in the study of the perception of perspective, since three-dimensional space would not be understood from a two-dimensional representation of space. The project aims to develop a comparison between the representation systems based on the automatic acquisition of various data by different 3D survey techniques. In particular, the document reports the results of an analysis based on the Sansevero Chapel in Naples.</p>

COLORFUL SYMMETRIC IMAGES IN THREE-DIMENSIONAL SPACE FROM DYNAMICAL SYSTEMS

Fractals ◽  
2012 ◽  
Vol 20 (01) ◽  
pp. 53-60 ◽  
Author(s):  
JIAN LU ◽  
YURU ZOU ◽  
ZEYI LIU ◽  
WENXIA LI
Keyword(s):  
Dynamical Systems ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Automatic Generation ◽  
Point Of View ◽  
Density Functions ◽  
Three Dimensional Space

Functions that are invariant with respect to the tetrahedral and cubic symmetries are determined. These invariant mappings are applied to serve as the density functions for automatic generation of the colorful images with such symmetries in three dimensional space from a dynamical system's point of view.

Isomerism and topicity in three- and four-dimensional space: A review

1988 ◽  
Vol 53 (11) ◽  
pp. 2675-2713 ◽  
Author(s):  
Jaroslav Jonas
Keyword(s):  
Dimensional Space ◽  
Rapid Development ◽  
Three Dimensional ◽  
Point Of View ◽  
Molecular Structures ◽  
New Findings ◽  
Chemical Behaviour ◽  
Broad Meaning ◽  
Three Dimensional Space

Isomerism is a notion of a considerably broad meaning. Not only chemists but also physicists, biologists and philosophers come across it. In the sequel, some basic problems of the contemporary understanding of the phenomenon of isomerism of molecular structures and related problems of topic relationships between homomorphic ligands and faces are dealt with. Illustrating factual material is selected within the domain of organic chemistry. With the rapid development of nomenclature in this area in mind, the issues are presented from a point of view stressing the unity of historical and logical moments. Problems arising when moving from the analysis of molecular structure models towards the analysis of real sets of molecules are highlighted. Differences between the analysis of static molecular structures in three-dimensional space and the analysis of real dynamic molecular structures in four-dimensional space are dealt with in greater detail. The method of NMR spectroscopy is discussed from this standpoint as an example of the most widespread research tool for investigating intramolecular dynamism at present. Stereo-differentiating reactions are also treated briefly and a suggestion is made to introduce into the teaching of isomerism and topicity a classification of differentiating interactions. The relationships discussed are demonstrated comprehensively using the chemical behaviour of an optically active trisubstituted cycloheptatriene-norcaradiene system as an example and, are also discussed in connection with some new findings concerning actual chiral geometries in some conventionally achiral systems. Attention is paid to didactic presentation of the topic and an attempt is made to show probable trends in future development in this domain.

Virtual Audio Systems

2008 ◽  
Vol 17 (6) ◽  
pp. 527-549 ◽  
Author(s):  
B. Kapralos ◽  
M. R. Jenkin ◽  
E. Milios
Keyword(s):  
Dimensional Space ◽  
Three Dimensional ◽  
Fixed Number ◽  
Technical Literature ◽  
Auditory Cues ◽  
Advantages And Disadvantages ◽  
Arbitrary Position ◽  
Environment Simulation ◽  
Three Dimensional Space ◽  
Virtual Audio

To be immersed in a virtual environment, the user must be presented with plausible sensory input including auditory cues. A virtual (three-dimensional) audio display aims to allow the user to perceive the position of a sound source at an arbitrary position in three-dimensional space despite the fact that the generated sound may be emanating from a fixed number of loudspeakers at fixed positions in space or a pair of headphones. The foundation of virtual audio rests on the development of technology to present auditory signals to the listener's ears so that these signals are perceptually equivalent to those the listener would receive in the environment being simulated. This paper reviews the human perceptual and technical literature relevant to the modeling and generation of accurate audio displays for virtual environments. Approaches to acoustical environment simulation are summarized and the advantages and disadvantages of the various approaches are presented.

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