A Combinatorial Approach for Developing Ring Communication Graphs for Vehicle Formations

2017 ◽  
Vol 139 (10) ◽  
Author(s):  
Shyamprasad Konduri ◽  
Prabhakar R. Pagilla ◽  
Swaroop Darbha
Keyword(s):  
Three Dimensional ◽  
Combinatorial Approach ◽  
Basic Form ◽  
Communication Structure ◽  
Information And Communication ◽  
Communication Distance ◽  
Vehicle Platoons ◽  
The Traveling Salesman Problem ◽  
Ring Graph ◽  
Vehicle Formations

In this paper, we study vehicle formations employing ring-structured communication strategies and propose a combinatorial approach for developing ring graphs for vehicle formations. In vehicle platoons, a ring graph is formed when each vehicle receives information from its predecessor, and the lead vehicle receives information from the last vehicle, thus forming a ring in its basic form. In such basic form, the communication distance between the first and the last vehicle increases with the platoon size, which creates implementation issues due to sensing range limitations. If one were to employ a communication protocol such as the token ring protocol, the delay in updating information and communication arises from the need for the token to travel across the entire graph. To overcome this limitation, alternative ring graphs which are formed by smaller communication distances between vehicles are proposed in this paper. For a given formation and a constraint on the maximum communication distance between any two vehicles, an algorithm to generate a ring graph is obtained by formulating the problem as an instance of the traveling salesman problem (TSP). In contrast to the vehicle platoons, generation of a ring communication graph is not straightforward for two- and three-dimensional formations; the TSP formulation allows this for both two- and three-dimensional formations with specific constraints. In addition, with ring communication structure, it is possible to devise simple ways to reconfigure the graph when vehicles are added/removed to/from the formation, which is discussed in the paper. Further, the experimental results using mobile robots for platooning and two-dimensional formations using ring graphs are shown and discussed.

Flow Experience among Information and Communication Technology Users

2008 ◽  
Vol 102 (1) ◽  
pp. 29-39 ◽  
Author(s):  
Alma M. Rodríguez-Sánchez ◽  
Wilmar B. Schaufeli ◽  
Marisa Salanova ◽  
Eva Cifre
Keyword(s):  
Public Administration ◽  
Information And Communication Technology ◽  
Communication Technology ◽  
Daily Life ◽  
Three Dimensional ◽  
Flow Experience ◽  
Information And Communication ◽  
Positive Experiences ◽  
Technology Users ◽  
Flow Experiences

The use of technologies is more common in daily life; working with technologies might be associated with positive experiences such as flow. However, there is little empirical research on flow experiences in technology settings. The main aim of this study was to confirm the three-dimensional construct of flow, i.e., absorption, enjoyment, and intrinsic interest, among 517 Information and Communication Technology users [234 students whose mean age was 23 yr. ( SD = 3.8)] from different areas of study, mainly Law, Public Administration, Chemistry, and Psychology, and 283 employees [whose mean age was 33 yr. ( SD = 7.8)] of 21 different companies from various sectors of production, namely, public administration, industrial production, and services. Analysis showed, as expected, flow is a three-dimensional psychological construct and invariant among samples of technology users. Practical and theoretical implications as well as further research are discussed.

Fabrication of Micro Tetrahedron Patterns Using Ultra-Precision Shaping System

2008 ◽  
Vol 381-382 ◽  
pp. 469-472
Author(s):  
J.W. Park ◽  
Soo Chang Choi ◽  
H.S. Oh ◽  
Yong Woo Kim ◽  
S.W. Kim ◽  
...  
Keyword(s):  
High Intensity ◽  
Three Dimensional ◽  
Precision Machining ◽  
Machining Errors ◽  
High Form ◽  
Shaping System ◽  
Information And Communication ◽  
Ultra Precision ◽  
Surface Fabrication ◽  
Micro Patterns

Recently, ultra-precision machining of components and dies for information and communication industries, such as fresnel mirrors, diffraction lens, and die for super high intensity reflective sheet is one of the major target. To machine three-dimensional micro patterns, such as super high-intensity reflective sheets, ultra-precision and mirror surface fabrication processes are required. It has been reported, however, that continuous cutting, such as turning or shaping, is more suitable to ultra-precision machining. Many researchers have studied the manufacturing process of reflective sheet dies to obtain high form accuracy and surface quality. In this paper, ultra-precision shaping system was developed to fabricate micro patterns mechanically. In order to estimate performance of the shaping system, micro V-shaped grooves and tetrahedron pattern arrays for a super high intensity reflective sheet was applied. Also, a new measuring technology to inspect form and machining errors of a machined tetrahedron patterns was proposed. The results show that shaping system has a positioning accuracy of x, y, z axis with 100, 10, 10nm resolution, respectively. Micro V-shaped grooves could be machined at various depths and micro tetrahedron patterns with a good quality were obtained as well.

ONLINE ANIMATION SYSTEM FOR PRACTICING CUED SPEECH

2010 ◽  
Vol 10 (04) ◽  
pp. 497-512
Author(s):  
BLAGICA JOVANOVA ◽  
IVICA ARSOV ◽  
MARIUS PREDA ◽  
FRANÇOISE PRETEUX
Keyword(s):  
Real Time ◽  
Information And Communication Technologies ◽  
Three Dimensional ◽  
Communication Technologies ◽  
3D Graphics ◽  
Core Technology ◽  
Potential Applications ◽  
User Acceptability ◽  
Information And Communication ◽  
Cued Speech

This paper presents a set of information and communication technologies developed with the goal to improve the practice of cued speech. They are based on three-dimensional (3D) graphics and are covering the entire end-to-end content chain: production, transmission, and visualization. Starting from defining a set of potential applications, the requirements of the targeted system for cued speech are set. The research and development path takes into account high-quality animation, real-time constraints, personalization, user acceptability and, equally important, the easiness and feasibility of the deployment. The latter led to a strong orientation toward open standards. The original components of the system include 3D graphics and animation encoders, streaming servers, and visualization engines. The core technology is validated in two real-time applications: a web service for text to animation conversion and a chat service supporting two or more users.

A Three-Dimensional Generalization of Reuleaux’s Method Based on Line Geometry

2006 ◽  
Author(s):  
Jasem Baroon ◽  
Bahram Ravani
Keyword(s):  
Rigid Body ◽  
Least Squares ◽  
Least Squares Method ◽  
Three Dimensional ◽  
Line Geometry ◽  
Basic Form ◽  
Motion Reconstruction ◽  
Linear Solution ◽  
On Line

In kinematics, the problem of motion reconstruction involves generation of a motion from the specification of distinct positions of a rigid body. In its most basic form, this problem involves determination of a screw displacement that would move a rigid body from one position to the next. Much if not all of the previous work in this area has been based on point geometry. In this paper, we develop a method for motion reconstruction based on line geometry. An elegant geometric method is developed based on line geometry that can be considered as a generalization of the classical Reuleaux’s method used in 2D kinematics. The case of over determined system is also considered a linear solution is presented based on least squares method.

Energy in 3D

2017 ◽  
pp. 444-463
Author(s):  
Giuliana Finco
Keyword(s):  
Information And Communication Technologies ◽  
Virtual Worlds ◽  
Smart City ◽  
City Planning ◽  
Renewable Energy Sources ◽  
Three Dimensional ◽  
Communication Technologies ◽  
Solar Panels ◽  
Interactive Games ◽  
Information And Communication

The course is developed from the study in Life Sciences and energy, till the deepening about the fossil and renewable sources, with video display, animations, little experiments, interactive games and multimedia presentations using the IWB of the renewable energy sources. After scoring a summary of key information, we switch to implement a Smart city planning workshop, drawing three-dimensionally objects with the 3D graphic application Sketchup, until build the city furnished with solar panels placed on the roofs. At the end of the trail, the educational activities are implemented in the Virtual World Scuola3D supported by a proactive and creative way to educate pupils by conscious and creative use of information and communication technologies, with the use of 3D and virtual worlds for live at three-dimensional virtual experience until they are able to design and build a three-dimensional ideal city, the “Smart city” for a sustainable future.

Navigating choppy discourses: A conceptual framework for understanding synchronous text-based computer-mediated communication

2020 ◽  
Vol 40 (2) ◽  
pp. 171-193
Author(s):  
Janaina Minelli de Oliveira ◽  
Vanessa Esteve-González
Keyword(s):  
Conceptual Framework ◽  
Student Teachers ◽  
Computer Mediated Communication ◽  
Three Dimensional ◽  
Learning Activities ◽  
Mediated Communication ◽  
Common View ◽  
Systemic Functional Grammar ◽  
Computer Mediated ◽  
Information And Communication

AbstractThis paper presents an investigation into patterns of interaction in synchronous, text-based computer-mediated communication (SCMC) with a focus on participation. The data constitute a corpus of 3,785 words from a series of interactions between student teachers performing learning activities in a three-dimensional online environment. Drawing on a systemic functional grammar perspective of language, we aim to develop a conceptual framework for understanding participation as made up of interactional patterns in students’ linguistic exchanges while performing learning activities. Our findings show that verbal negotiation that creates a shared understanding of what the group should accomplish or a common view of how to perform the activity is more frequent than strict activity organization. We argue that there are features of CMC signaling higher levels of complexity than those ordinarily found in face to face or written communication. The three broad interactional features identified – blending, turn-taking collaboration and delay endurance – corroborate our claim. This paper presents evidence that participation in text-based SCMC with learning purposes demands a disposition for collaboration and solidarity, a capacity to endure delay, and the ability to manage a conglomerate of information and communication tools without instructions on how-to processes.

scholarly journals DIGITAL SURVEYS AND 3D RECONSTRUCTIONS FOR AUGMENTED ACCESSIBILITY OF ARCHAEOLOGICAL HERITAGE

2019 ◽  
Vol XLII-2/W9 ◽  
pp. 205-212 ◽  
Author(s):  
M. Campi ◽  
A. di Luggo ◽  
D. Palomba ◽  
R. Palomba
Keyword(s):  
Three Dimensional ◽  
Research Centre ◽  
Campania Region ◽  
Archaeological Heritage ◽  
Current Configuration ◽  
Digital Reconstruction ◽  
Information And Communication ◽  
Colorimetric Data ◽  
Three Dimensional Models ◽  
The University

<p><strong>Abstract.</strong> This paper presents part of the results of a larger research project that focused on the surveying and documenting of Roman theatres and amphitheatres in the Campania region as well as the testing of a virtual fruition system for the digital reconstruction of a case study: the Roman theatre of Benevento. The work was carried out by the research group at the Interdepartmental Urban/Eco Research Centre of the University of Naples Federico II in collaboration with Spinvector, a company specialized in ICT – Information and Communication Technology – which lead to the defining of a fruition system of Cultural Heritage applied to archaeological heritage.</p><p>The project included 3D digital surveys of the study samples carried out using reality-based techniques, which allowed for the acquisition of metric, morphological, geometric and colorimetric data. This made it possible to elaborate three-dimensional models, based on the current configuration of the places as well as of the possible original reconfigurations.</p>

Octacalcium Phosphate as a Precursor in Biomineral Formation

1987 ◽  
Vol 1 (2) ◽  
pp. 306-313 ◽  
Author(s):  
W.E. Brown ◽  
N. Eidelman ◽  
B. Tomazic
Keyword(s):  
Thermogravimetric Analysis ◽  
Calcium Phosphates ◽  
Three Dimensional ◽  
Octacalcium Phosphate ◽  
Basic Form ◽  
Vacancy Defects ◽  
Impurity Ions

What are biominerals and how are they formed? It is usually assumed: (i) that the prototype for most apatitic biominerals is hydroxyapatite (OHAp), Ca5(PO4) 3OH; and (ii) that the OHAp structure has been modified by the presence of impurity ions and vacancy defects in specific OHAp lattice sites. The usual answer, at least implicitly, to the second question is that the apatitic mineral is formed directly by the precipitation of ions from the surrounding solution. Our answers are: (i) that apatitic biominerals are formed through a precursor mechanism in which octacalcium phosphate (OCP), Ca8H 2(PO4)6·5H2O, precipitates first and then hydrolyzes ireversibly in situ to a transition product intermediate to OCP and OHAp; and (ii) that this product, "octacalcium phosphate hydrolyzate" (OCPH), may contain (a) OHAp-like and OCP-like domains in varying amounts, (b) vacancy defects and impurity ions in lattice sites in these domains, and (c) various kinds of one-, two-, and three-dimensional defects which are not present in either the OHAp or the OCP lattice, these defects being formed during the in situ hydrolysis step. A calcification model of this type was first proposed in 1957, but full acceptance was delayed because most of the evidence was circumstantial and in vitro in nature. The situation has changed radically because of three unrelated studies that are in vivo in nature but lead to the same conclusion: I. 32P-pyrolysis studies of rat enamel: The results clearly demonstrated that an acidic calcium phosphate precursor was involved. II. Precipitation of calcium phosphates in serum. Ultrafiltered serum was equilibrated with brushite. Subsequent changes in the ionic concentrations revealed that OCP was formed at first and then hydrolyzed to a more basic form, OCPH, but never reached the solubility of OHAp. III. Physicochemical properties of cardiovascular biominerals: We recently characterized biominerals in cardiovascular deposits in an encompassing variety of ways. As an overall conclusion, OCPH was the prototype most compatible with the data [including indices of refraction, solubility, P2O74- formation on pyrolysis, thermogravimetric analysis (TGA) measurements, presence of water, and incorporation of CO32-, Na+, and Mg2+]. This calcification model has important consequences relative to all kinds of calcification and decalcification processes, including those of enamel.

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