The Synthesis of Robust Spherical Motion Generators

2004 ◽  
Author(s):  
Khalid Al-Widyan ◽  
Jorge Angeles
Keyword(s):  
Theoretical Framework ◽  
Numerical Example ◽  
General Methodology ◽  
Spherical Motion ◽  
Selection Of ◽  
Robust Synthesis

The synthesis of spherical motion generators in the presence of an incomplete set of finitely-separated attitudes is discussed in this paper. Given that five attitudes of the coupler link define a discrete set of dyads, any number of attitudes smaller than five is considered incomplete in this paper. The attitudes completing the set are determined so as to produce a robust linkage against variations in these attitudes. To this end, a theoretical framework as well as a general methodology for robust synthesis are laid down. Robustness is needed in this context to overcome the presence of uncertainty due to the selection of the intermediate attitudes, which many a time are left up to the mechanism designer’s judgment. To validate the concepts and illustrate the application of the methodology proposed here, we include a numerical example.

The Synthesis of Spherical Motion Generators in the Presence of an Incomplete Set of Attitudes

2014 ◽  
Vol 6 (3) ◽  
Author(s):  
Khalid Al-Widyan ◽  
Jorge Angeles
Keyword(s):  
Rigid Body ◽  
Engineering Design ◽  
Theoretical Framework ◽  
General Methodology ◽  
Four Bar Linkage ◽  
Robust Engineering Design ◽  
Guidance Problem ◽  
Spherical Motion ◽  
Spherical Rigid Body ◽  
Selection Of

Proposed in this paper is a general methodology applicable to the synthesis of spherical motion generators in the presence of an incomplete set of finitely separated attitudes. The spherical rigid-body guidance problem in the realm of four-bar linkage synthesis can be solved exactly for up to five prescribed attitudes of the coupler link, and hence, any number of attitudes smaller than five is considered incomplete in this paper. The attitudes completing the set are determined to produce a linkage whose performance is robust against variations in the unprescribed attitudes. Robustness is needed in this context to overcome the presence of uncertainty due to the selection of the unspecified attitudes, that many a time are specified implicitly by the designer upon choosing, for example, the location of the fixed joints of the dyads. A theoretical framework for model-based robust engineering design is thus, recalled, and a methodology for the robust synthesis of spherical four-bar linkages is laid down. An example is included here to concretize the concepts and illustrate the application of the proposed methodology.

The Kinematic Synthesis of a Robust RCCC Mechanism for Pick-and-Place Operations

2012 ◽  
Author(s):  
Khalid M. Al-Widyan ◽  
Jorge Angeles
Keyword(s):  
Rigid Body ◽  
Robust Design ◽  
Theoretical Framework ◽  
Synthesis Problem ◽  
Kinematic Synthesis ◽  
General Methodology ◽  
Pick And Place ◽  
Four Bar Linkage ◽  
Pick And Place Operation ◽  
Selection Of

Proposed in this paper is a methodology to synthesize a RCCC four-bar linkage intended for pick-and-place operations. The synthesis problem is set in the context of rigid-body guidance, which can be solved exactly for up to four prescribed poses of the coupler link. As a consequence, for a pick-and-place operation, the selection of the unspecified two intermediate poses is thus left up to the mechanism designer’s judgment. In this paper, we propose a method to determine the two intermediate poses resorting to the concept of robustness. In fact, robustness is needed in this context to overcome the presence of uncertainty due to the selection of the two unspecified poses. To this end, a theoretical framework for model-based robust design is invoked and a general methodology for robust kinematic synthesis is laid down. A numerical example is included to validate the concepts and illustrate the application of the methodology proposed here.

scholarly journals Moving from tradition-based to competence-based psychotherapy

2021 ◽  
pp. ebmental-2020-300219
Author(s):  
Winfried Rief
Keyword(s):  
Basic Science ◽  
Theoretical Framework ◽  
Psychological Interventions ◽  
Skills Acquisition ◽  
Relationship Patterns ◽  
Cognitive Behavioural ◽  
Training Programmes ◽  
New Research ◽  
And Training ◽  
Selection Of

Current education and training in psychological interventions is mostly based on different ‘schools’ (traditions such as cognitive–behavioural or psychodynamic therapy), and strong identification with these specific traditions continuously hinders a scientifically based development of psychotherapy. This review is selective rather than systematic and comprehensive. In addition to the consideration of other influential publications, we relied on a literature search in Web of Science using the following terms (update: 24 December 2020): (psychotherapy AND meta-analy* AND competence*). After summarising current problems, a pathway for solving these problems is presented. First, we have to recategorise psychological interventions according to the mechanisms and subgoals that are addressed. The interventions can be classified according to the foci: (1) skills acquisition (eg, communication, emotion regulation, mentalisation); (2) working with relationship patterns and using the therapeutic relationship to modify them; and (3) clarification of motives and goals. Afterwards, the training of psychotherapists can switch from focusing on one theoretical framework to learning the different competences for modification according to these new categories. The selection of topics to be addressed should follow best evidence-based mechanisms and processes of mental disorders and interventions. Psychology offers knowledge about these mechanisms that can be understood as a basic science for psychological treatments in general. This requires better connection with basic science, new research efforts that focus on treatment subgoals, theory-overarching optimisation of the selection and personalisation of treatments, and new types of training for psychotherapists that are designed to optimise therapists’ competences accordingly, instead of limiting training programmes to one single theoretical framework.

Introduction

2017 ◽  
Keyword(s):  
United States ◽  
The United States ◽  
Theoretical Framework ◽  
Human Hand ◽  
Theoretical Context ◽  
Critical Questions ◽  
Central Set ◽  
The Status ◽  
The Subject ◽  
Selection Of

The Introduction provides an overview of the central questions and the theoretical framework of the book. Since the early 1990s in Europe and the United States many artists critically re-appropriated religious, motifs, themes and images to produce works that cannot qualify as ‘religious,’ but remains in a dialogue with the visual legacy of mostly the Western, and more specifically the Catholic, version of Christianity. Present-day art does not embed religious images to celebrate them, but in order to pose critical questions concerning central aspects of the rules that regulate the status of images, their public significance, the conditions of their production and authorship, and their connection to an origin or tradition, a context or an author that guarantees their value. The motif of the true image or acheiropoietos (not made by a human hand) is related to central set of features that allow distinguishing between regimes or eras of the image. Its transformations provide a conceptual matrix for understanding of the reconfiguring relationships between art and religion. The introduction provides an overview of the theoretical context, the selection of artworks, bibliography on the subject and the chapters of the book.

scholarly journals Mean-Variance Model for Optimal Multinational Project Adjustment and Selection

2013 ◽  
Vol 380-384 ◽  
pp. 4809-4814
Author(s):  
Xiao Li Su ◽  
Xiao Xia Huang
Keyword(s):  
Random Variables ◽  
Cash Flows ◽  
Selection Model ◽  
Selection Problem ◽  
Variance Model ◽  
Numerical Example ◽  
Mean Variance ◽  
Selection Of

This paper discusses the multinational project adjustment and selection problem in which project parameters are regarded as random variables. In the paper, adjustment of foreign existing projects and selection of the new foreign projects are considered simultaneously. Typical cash flows and value sources of foreign projects are introduced and a mean-variance optimal multinational adjustment and selection model is proposed. As an illustration, a numerical example is also presented.

scholarly journals LiSBOA: LiDAR Statistical Barnes Objective Analysis for optimal design of LiDAR scans and retrieval of wind statistics. Part I: Theoretical framework

2020 ◽  
Author(s):  
Stefano Letizia ◽  
Lu Zhan ◽  
Giacomo Valerio Iungo
Keyword(s):  
Optimal Design ◽  
Velocity Field ◽  
Scalar Fields ◽  
Theoretical Framework ◽  
Function Optimization ◽  
Objective Analysis ◽  
Lidar Measurements ◽  
Wind Statistics ◽  
Suitable Technique ◽  
Selection Of

Abstract. A LiDAR Statistical Barnes Objective Analysis (LiSBOA) for optimal design of LiDAR scans and retrieval of the velocity statistical moments is proposed. The LiSBOA represents an adaptation of the classical Barnes scheme for the statistical analysis of unstructured experimental data in N-dimensional spaces and it is a suitable technique for the evaluation over a structured Cartesian grid of the statistics of scalar fields sampled through scanning LiDARs. The LiSBOA is validated and characterized via a Monte Carlo approach applied to a synthetic velocity field. This revisited theoretical framework for the Barnes objective analysis enables the formulation of guidelines for optimal design of LiDAR experiments and efficient application of the LiSBOA for the post-processing of LiDAR measurements. The optimal design of LiDAR scans is formulated as a two cost-function optimization problem including the minimization of the percentage of the measurement volume not sampled with adequate spatial resolution and the minimization of the error on the mean of the velocity field. The optimal design of the LiDAR scans also guides the selection of the smoothing parameter and the total number of iterations to use for the Barnes scheme.

scholarly journals Searching for a Path: A Bibliometric study on Innovation and Technological Capabilities

2015 ◽  
Vol 3 (2) ◽  
pp. 54-66 ◽  
Author(s):  
João Heitor De Avila Santos ◽  
Paulo Antonio Zawislak ◽  
Gabriel Borela Franzoni ◽  
Henrique Correa Vieira
Keyword(s):  
Theoretical Framework ◽  
Technological Capability ◽  
Bibliometric Study ◽  
Technological Capabilities ◽  
Innovative Behavior ◽  
Field Of Study ◽  
The Subject ◽  
Scopus Database ◽  
Selection Of

Innovation is recognize as a matter of survival and success to firms and technological capabilities can lead to an innovative behavior by using technological resources and competences. The literature about technological capability and innovation is vast, counting on several approaches and a large number of researchers involved within. Based on this, our aim is to use a bibliometrics approach to map out the authors, institutions, journals and the evolution of the publication as well, to provide the path needed to build a theoretical framework about the theme. We held this research on the Scopus database using a standard search protocol to perform the selection of the sample. Our results indicates an emerging field of study and a large number papers and citations concentrated in few journals. Most cited authors are related to seminal works on the subject and most cited papers are ones from late 90’s and early 2000.

scholarly journals Designing and building SCoPE²: A spoken corpus of Brazilian Portuguese and L2-English

2020 ◽  
Vol 8 ◽  
pp. 49-64
Author(s):  
Giovani Santos
Keyword(s):  
University Students ◽  
Spoken Language ◽  
Theoretical Framework ◽  
Brazilian Portuguese ◽  
Lessons Learned ◽  
Corpus Pragmatics ◽  
Do It Yourself ◽  
Gathering Data ◽  
Selection Of

This paper presents the process of designing and building a bilingual spoken corpus in order to pragmatically analyse oral L2-English discourse produced by a group of Brazilian university students living in Ireland. It discusses some of the decisions made, challenges faced, and considerations taken while designing a do-it-yourself corpus with a theoretical framework grounded in Corpus Pragmatics. The main objective is to share the lessons learned by examining the steps of designing and building SCoPE², a bilingual spoken corpus, including the selection of participants, gathering data, and challenges in transcribing and coding spoken language with pragmatics in mind.

Influence of gender on the use of kinship terms in English and Serbian

2021 ◽  
Author(s):  
Dragana Tadić
Keyword(s):  
Theoretical Framework ◽  
Contrastive Analysis ◽  
Actual Use ◽  
Analytical Tools ◽  
Cultural Linguistics ◽  
Selection Of

Abstract Kinship terms are widely present in the English and Serbian language. However, research on their actual use and the role gender plays in the selection of those terms is fairly scarce. The purpose of this contrastive analysis is to explore the influence of gender on the use of kinship terms among the speakers of English and Serbian and to determine cultural conceptualizations underlying these terms. The study is corpus based. The data were collected by the means of questionnaires and analyzed statistically. Kinship terms represent a culturally constructed category reflected in the lexicon of these two contrasted languages. For this reason, Cultural Linguistics and its theoretical and analytical tools serve as the basis for the theoretical framework for this study. The results of the analysis have shown that gender significantly influences the use and the selection of kinship terms.

scholarly journals New Exploration of Logic Starting Point of Audit Theory Structure

2019 ◽  
Vol 3 (2) ◽  
pp. 34
Author(s):  
Zanchun Xie
Keyword(s):  
Research And Development ◽  
Research Process ◽  
Theoretical Framework ◽  
Theory Structure ◽  
Structural Framework ◽  
Theoretical Structure ◽  
Theoretical System ◽  
Starting Point ◽  
Selection Of

As a discipline that has developed for many years, audit has been relatively mature and complete in its theoretical structure. As we all know, the establishment of any discipline requires a set of mature theoretical framework that are logical, progressive from point to surface. This theoretical structural framework is called the theoretical structure, and the research process of the audit discipline also needs to build such a theoretical system to make the audit research planned and structured, then the logical starting point in the audit theory structure will largely influence the direction and development of the audit discipline. In this paper, by expounding the characteristics and conditions of the logical starting point and combining some domestic and international discussions on the logical starting point, the author considers and explores the selection of logical starting point of the audit theory structure, hoping to select an amenable element as the logical starting point of the theoretical system to promote the research and development of the audit discipline.

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