A New Probabilistic Method for the Performance Evaluation of Manipulators: Part I — Methodology

1989 ◽  
Author(s):  
J. Rastegar ◽  
J. R. Singh
Keyword(s):  
Performance Evaluation ◽  
Probabilistic Method ◽  
Robotic Manipulators ◽  
Condition Numbers ◽  
Force Transmission ◽  
Transmission Characteristics ◽  
Joint Coordinates ◽  
Definition Of ◽  
Planning Problems ◽  
And Task

Abstract A totally new probabilistic method is introduced which can be used to obtain a global map of the distribution of the velocity and force transmission characteristics of robotic manipulators. The method yields the global distributions of volumes of the velocity and force ellipsoids, the eigenvectors, the eigenvalues, and the condition numbers. It utilizes the most basic definition of the properties of the mapping functions between the joint coordinates and the Cartesian (task) coordinates. The method is extremely simple, numerical in nature, and readily implementable on a computer. It requires very simple and limited analytical formulations. No inverse calculations are involved. The method furnishes a very simple and effective tool for solving a number of synthesis, performance evaluation, and task planning problems. In Part II of this paper, the method is utilized for optimal positioning of task spaces within workspaces of manipulators. Several examples are presented.

A New Probabilistic Method for the Performance Evaluation of Manipulators

1994 ◽  
Vol 116 (2) ◽  
pp. 462-466 ◽  
Author(s):  
J. Rastegar ◽  
J. R. Singh
Keyword(s):  
Probabilistic Method ◽  
Optimality Criteria ◽  
Complex Task ◽  
Conditional Distributions ◽  
Task Space ◽  
Force Transmission ◽  
Basic Definition ◽  
Transmission Characteristics ◽  
Joint Coordinates ◽  
Definition Of

A new probabilistic method is introduced which can be used to obtain a global map of the distribution of the velocity and force transmission characteristics of robot manipulators. The method yields the global distributions of volumes of the velocity and force ellipsoids. It utilizes the most basic definition of the properties of the mapping functions between the joint coordinates and the Cartesian (task) coordinates. The method is extremely simple, numerical in nature, and readily implemented on a computer. It requires very simple and limited analytical formulations. No inverse calculations are involved. The method can be utilized for optimal positioning of task spaces within workspaces of manipulators. Velocity and force transmission (alone and in combination) may be used as optimality criteria. Complex task space and manipulator workspace geometries are readily handled. The tasks, velocity, and force transmission requirements may assume any arbitrary, even conditional, distributions within the task space. These distributions, especially conditional distributions, are extremely difficult, if not impossible, to handle using other methods. The application of the method to task planning and optimal manipulator synthesis is discussed. Several examples are presented.

A New Probabilistic Method for the Performance Evaluation of Manipulators: Part II — Application to Task Placement

1989 ◽  
Author(s):  
J. Rastegar ◽  
J. R. Singh
Keyword(s):  
Performance Evaluation ◽  
Probabilistic Method ◽  
Robotic Manipulator ◽  
Optimality Criteria ◽  
Optimal Placement ◽  
Arbitrary Form ◽  
Complex Task ◽  
Task Space ◽  
Force Transmission ◽  
Task Placement

Abstract A probabilistic method for optimal placement of a prescribed task space in the workspace of a robotic manipulator is presented. Velocity and force transmission (alone and in combination) are used as optimality criteria. Complex task space and manipulator workspace geometries are readily handled. The distribution of the tasks within the task space, and the velocity and force transmission requirements may assume any arbitrary form. The method is extremely simple, does not require inverse calculations, is numerical in nature, and is readily implemented on computers. In many cases, the best location of the task space within the manipulator workspace can be visually ascertained. Minimal analytical formulations are required. Several examples are presented.

scholarly journals ONLINE VIDEO ADVERTISING: MEANING, TYPOLOGY AND EFFICIENCY ASSESSMENT

2021 ◽  
pp. 74-80
Author(s):  
A. Malei ◽  
T. Serada ◽  
A. Malei
Keyword(s):  
Performance Evaluation ◽  
Online Marketing ◽  
The Internet ◽  
Online Video ◽  
Marketing Campaign ◽  
Video Advertising ◽  
Efficiency Assessment ◽  
Definition Of ◽  
And Task

The purpose of the study, is to formulate the concept of "online video advertising " as an object of online marketing, to generalize its types and build a system of performance evaluation indicators. Based on the study of interpretation and content of the definition of "advertising" and its types, presented by different scientific domestic and foreign schools and scientists, the authors derived the definition of "online video advertising" by highlighting the features of advertising, and also presented the typology of video advertising on the Internet based on the proposed classification attributes: the location, technical execution, and task of video advertising. The authors also proposed a system to assess the effectiveness of online video advertising based on two groups of metrics: primary (determined based on the actions of online users) and targeted (aimed at assessing the specific goals of the marketing campaign), which can objectively evaluate the success and productivity of video advertising.

DEFINITION OF TIME SPENT ON REPAIR OF BUS TRANSMISSION UNITS TAKING INTO ACCOUNT TECHNOLOGICAL EQUIPMENT RELIABILITY

2020 ◽  
Vol 2020 (9) ◽  
pp. 29-33
Author(s):  
Sergey Bulatov
Keyword(s):  
Negative Impact ◽  
Probabilistic Method ◽  
Technological Equipment ◽  
Quality And Safety ◽  
Transmission Unit ◽  
Equipment Reliability ◽  
Hours Of Work ◽  
Definition Of ◽  
Time Decrease

The paper purpose is the effectiveness estimation in the technological equipment use, taking into account its reliability and productivity for defective transmission units of buses. The problem consists in the determination of time to be spent on repair of bus transmission units taking into account technological equipment reliability. In the paper there is used a probabilistic method for the prediction bus transmission units, and also a method of the dynamics of averages which allow ensuring minimum of costs for units downtime during repair and equipment cost. The need for repair of transmission units (gear box) arises on an average after 650 hours, the average productivity of the bench makes 4.2 bus / hour. The bench fails on the average after 4600 hours of work, the average time of the bench makes 2 hours. In such a way the solution of the problem specified allows analyzing the necessity of time decrease for transmission unit repair to avoid long downtimes of buses in repair areas without negative impact upon high repair quality and safety during the further operation.

Effects of taboo conversation topics on impression formation and task performance evaluation

2020 ◽  
Vol 48 (8) ◽  
pp. 1-11
Author(s):  
Hye Eun Lee ◽  
Catherine Kingsley Westerman ◽  
Emi Hashi ◽  
Kyle B. Heuett ◽  
Stephen A. Spates ◽  
...  
Keyword(s):  
Body Weight ◽  
Performance Evaluation ◽  
Social Norms ◽  
Task Performance ◽  
Interpersonal Communication ◽  
Impression Formation ◽  
Communication Satisfaction ◽  
Communication Interaction ◽  
Positive Impression ◽  
And Task

We examined how taboo conversation topics, such as being arrested, religion, and one's body weight, affect impression formation and task performance. In an experiment with 109 women, each participant and a female research confederate, whom the participant believed to be another participant, had a conversation and were asked to complete a task. We manipulated the conversation topics and actual task performance of the confederate, and measured participants' communication satisfaction; perception of the confederate's social, physical, and task attractiveness; and task performance. The results show that when the confederate performed well and appropriate (vs. taboo) conversation topics were discussed, the participants formed a more positive impression of the confederate and evaluated her task performance more positively. Therefore, if social norms for appropriate conversation topics are not followed, individuals may be less satisfied with their interpersonal communication interaction with the person who has not observed the norms, and may evaluate the task performance of that other person more negatively.

The Mechanical Performance Evaluation of a Mechanism with Curved Edge Driving Component

2013 ◽  
Vol 834-836 ◽  
pp. 1290-1294
Author(s):  
Xin Qin Liu
Keyword(s):  
Performance Evaluation ◽  
Fast Moving ◽  
Mechanical Performance ◽  
Gain Coefficient ◽  
The Other ◽  
Force Transmission ◽  
Transmission Performance ◽  
Connecting Rod ◽  
Numerical Examples ◽  
Straight Line

Mechanicalmethods were employed to study the motion and force transmission performance ofa kind of connecting rod slider mechanism with a curved edge driving component.The deduction methods and the computation formulae of the slider displacement,velocity, acceleration and the executive force gain coefficient were given.Considering two cases of the driving components with straight line edge andexponential function edge, the numerical examples was computed respectively,the results show that the former one is suitable for the force transmission andcan be used in the grip design and the other one is suitable for the motiontransmission which can be used in the fast moving mechanism

Performance Evaluation Tests for Environmental Research (Peter): Evaluation of 114 Measures

1986 ◽  
Vol 63 (2) ◽  
pp. 683-708 ◽  
Author(s):  
Alvah C. Bittner ◽  
Robert C. Carter ◽  
Robert S. Kennedy ◽  
Mary M. Harbeson ◽  
Michele Krause
Keyword(s):  
Performance Evaluation ◽  
Repeated Measures ◽  
Time Course ◽  
Environmental Studies ◽  
Acceptable Level ◽  
Environmental Research ◽  
Human Capabilities ◽  
Task Definition ◽  
And Task

The goal of the Performance Evaluation Tests for Environmental Research (PETER) Program was to identify a set of measures of human capabilities for use in the study of environmental and other time-course effects. 114 measures studied in the PETER Program were evaluated and categorized into four groups based upon task stability and task definition. The Recommended category contained 30 measures that clearly obtained total stabilization and had an acceptable level of reliability efficiency. The Acceptable-But-Redundant category contained 15 measures. The 37 measures in the Marginal category, which included an inordinate number of slope and other derived measures, usually had desirable features which were outweighed by faults. The 32 measures in the Unacceptable category had either differential instability or weak reliability efficiency. It is our opinion that the 30 measures in the Recommended category should be given first consideration for environmental research applications. Further, it is recommended that information pertaining to preexperimental practice requirements and stabilized reliabilities should be utilized in repeated-measures environmental studies.

Infodemic surrounding COVID-19: Can LIS students recognize and categorize “problematic information” types on social media?

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Shamima Yesmin ◽  
S.M. Zabed Ahmed
Keyword(s):  
Social Media ◽  
Online Survey ◽  
Information Science ◽  
Wrong Answer ◽  
Student Groups ◽  
Content Type ◽  
Correct Definition ◽  
Significant Difference ◽  
Definition Of ◽  
And Task

Purpose The purpose of this paper is to investigate Library and Information Science (LIS) students’ understanding of infodemic and related terminologies and their ability to categorize COVID-19-related problematic information types using examples from social media platforms. Design/methodology/approach The participants of this study were LIS students from a public-funded university located at the south coast of Bangladesh. An online survey was conducted which, in addition to demographic and study information, asked students to identify the correct definition of infodemic and related terminologies and to categorize the COVID-related problematic social media posts based on their inherent problem characteristics. The correct answer for each definition and task question was assigned a score of “1”, whereas the wrong answer was coded as “0”. The percentages of correctness score for total and each category of definition and task-specific questions were computed. The independent sample t-test and ANOVA were run to examine the differences in total and category-specific scores between student groups. Findings The findings revealed that students’ knowledge concerning the definition of infodemic and related terminologies and the categorization of COVID-19-related problematic social media posts was poor. There was no significant difference in correctness scores between student groups in terms of gender, age and study levels. Originality/value To the best of the authors’ knowledge, this is the first time an effort was made to understand LIS students’ recognition and classification of problematic information. The findings can assist LIS departments in revising and improving the existing information literacy curriculum for students.

scholarly journals Parallel Robot Translational Performance Evaluation through Direction-Selective Index (DSI)

2011 ◽  
Vol 2011 ◽  
pp. 1-14 ◽  
Author(s):  
G. Boschetti ◽  
R. Rosa ◽  
A. Trevisani
Keyword(s):  
Performance Evaluation ◽  
Performance Index ◽  
General Framework ◽  
Dynamic Performance ◽  
Parallel Manipulators ◽  
Parallel Robot ◽  
Performance Indexes ◽  
Definition Of ◽  
Performance Variations

Performance indexes usually provide global evaluations of robot performances mixing their translational and/or rotational capabilities. This paper proposes a definition of performance index, called direction-selective index (DSI), which has been specifically developed for parallel manipulators and can provide uncoupled evaluations of robot translational capabilities along relevant directions. The DSI formulation is first presented within a general framework, highlighting its relationship with traditional manipulability definitions, and then applied to a family of parallel manipulators (4-RUU) of industrial interest. The investigation is both numerical and experimental and allows highlighting the two chief advantages of the proposed DSIs over more conventional manipulability indexes: not only are DSIs more accurate in predicting the workspace regions where manipulators can best perform translational movements along specific directions, but also they allow foreseeing satisfactorily the dynamic performance variations within the workspace, though being purely kinematic indexes. The experiments have been carried out on an instrumented 4-RUU commercial robot.

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