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1 – 10 of 18Yongyao Li, Ming Cong, Dong Liu, Yu Du, Minjie Wu and Clarence W. de Silva
Rigid robotic hands are generally fast, precise and capable of exerting large forces, whereas soft robotic hands are compliant, safe and adaptive to complex environments. It is…
Abstract
Purpose
Rigid robotic hands are generally fast, precise and capable of exerting large forces, whereas soft robotic hands are compliant, safe and adaptive to complex environments. It is valuable and challenging to develop soft-rigid robotic hands that have both types of capabilities. The paper aims to address the challenge through developing a paradigm to achieve the behaviors of soft and rigid robotic hands adaptively.
Design/methodology/approach
The design principle of a two-joint finger is proposed. A kinematic model and a stiffness enhancement method are proposed and discussed. The manufacturing process for the soft-rigid finger is presented. Experiments are carried out to validate the accuracy of the kinematic model and evaluate the performance of the flexible body of the finger. Finally, a robotic hand composed of two soft-rigid fingers is fabricated to demonstrate its grasping capacities.
Findings
The kinematic model can capture the desired distal deflection and comprehensive shape accurately. The stiffness enhancement method guarantees stable grasp of the robotic hand, without sacrificing its flexibility and adaptability. The robotic hand is lightweight and practical. It can exhibit different grasping capacities.
Practical implications
It can be applied in the field of industrial grasping, where the objects are varied in materials and geometry. The hand’s inherent characteristic removes the need to detect and react to slight variations in surface geometry and makes the control strategies simple.
Originality/value
This work proposes a novel robotic hand. It possesses three distinct characteristics, i.e. high compliance, exhibiting discrete or continuous kinematics adaptively, lightweight and practical structures.
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Q.M. Jonathan Wu, Min‐Fan Ricky Lee and Clarence W. de Silva
This paper focuses on the design of an inexpensive and accurate range scanner for automatic acquisition of a CAD model of a manufactured part by using two‐dimensional images to…
Abstract
This paper focuses on the design of an inexpensive and accurate range scanner for automatic acquisition of a CAD model of a manufactured part by using two‐dimensional images to determine a digitized three‐dimensional shape. In the developed approach, the object is passed at a speed of 4 cm/s through a single linear laser stripe and forty continuous images are captured into the frame memory of the host computer for subsequent processing. A major problem that is encountered in the design of laser stripe scanner is the specula reflection, which can be mitigated by the developed approach. Six center‐locating algorithms are described, which are central to the developed approach. These algorithms are able to achieve sub‐pixel accuracy. The center of mass algorithm that uses three points, gives the best repeatability over the other algorithms. The center of mass algorithm that uses intensity threshold, provides the best linearity over the other algorithms.
Dong Liu, Ming Cong, Yu Du and Clarence W. de Silva
Indoor robotic tasks frequently specify objects. For these applications, this paper aims to propose an object-based attention method using task-relevant feature for target…
Abstract
Purpose
Indoor robotic tasks frequently specify objects. For these applications, this paper aims to propose an object-based attention method using task-relevant feature for target selection. The task-relevant feature(s) are deduced from the learned object representation in semantic memory (SM), and low dimensional bias feature templates are obtained using Gaussian mixture model (GMM) to get an efficient attention process. This method can be used to select target in a scene which forms a task-specific representation of the environment and improves the scene understanding by driving the robot to a position in which the objects of interest can be detected with a smaller error probability.
Design/methodology/approach
Task definition and object representation in SM are proposed, and bias feature templates are obtained using GMM deduction for features from high dimension to low dimension. Mean shift method is used to segment the visual scene into discrete proto-objects. Given a task-specific object, the top-down bias attention uses obtained statistical knowledge of the visual features of the desired target to impact proto-objects and generate the saliency map by combining with the bottom-up saliency-based attention so as to maximize target detection speed.
Findings
Experimental results show that the proposed GMM-based attention model provides an effective and efficient method for task-specific target selection under different conditions. The promising results show that the method may provide good approximation to how humans combine target cues to optimize target selection.
Practical implications
The present method has been successfully applied in plenty of natural scenes of indoor robotic tasks. The proposed method has a wide range of applications and is using for an intelligent homecare robot cognitive control project. Due to the computational cost, the current implementation of this method has some limitations in real-time application.
Originality/value
The novel attention model which uses GMM to get the bias feature templates is proposed for attention competition. It provides a solution for object-based attention, and it is effective and efficient to improve search speed due to the autonomous deduction of features. The proposed model is adaptive without requiring predefined distinct types of features for task-specific objects.
This chapter provides an assessment of how the late Portuguese colonial state (especially in Angola and Mozambique) responded to widespread conflict and anticolonial pressures…
Abstract
This chapter provides an assessment of how the late Portuguese colonial state (especially in Angola and Mozambique) responded to widespread conflict and anticolonial pressures. Focusing on its structures, idioms, and strategies of social transformation and control-especially as they relate to the domains of development and security-my assessment of state response emphasizes the coming together of: coercive repertoires of rule; planned developmental strategies of political, economic and social change; and processes of engineering sociocultural difference. The late colonial state’s developmental and repressive facets are critically assessed through mobilizing theoretical perspectives and empirical analysis.
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Jorge Alejandro Silva Rodríguez de San Miguel
The purpose of this paper is to review the management of air pollution in Mexico and strategies that have been considered to correct the issues, including potential future…
Abstract
Purpose
The purpose of this paper is to review the management of air pollution in Mexico and strategies that have been considered to correct the issues, including potential future directions to further improve air quality for Mexico’s environment and people.
Design/methodology/approach
Different serious academic databases were searched for material regarding the issue of air pollution in Mexico, such as Scopus and Social Science Citation Index. Regional concern was an important factor that was considered in this review. Material was considered based on its recency, academic importance and veracity. The studies selected mainly ranged from the mid-1990s to 2018.
Findings
Air pollution in Mexico has been a primary issue for the country’s administration and that of Mexico’s North American neighbour, the USA. It has contributed significantly to climate change and has had detrimental effects on both the environment and on the health of Mexican citizens in various ways. While efforts to ameliorate the situation have been relatively strong, it is hoped that ongoing cooperation between Mexico, the USA and Canada will influence the development of stricter emissions standards.
Originality/value
This paper considers current circumstances and whether enough has been done to mitigate Mexico’s significant air pollution problem. It also considers several recommendations made by commentators as to potential future directions to rectify the issues, as no similar review has been made for a developing Country.
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Cristiano Codagnone, Athina Karatzogianni and Jacob Matthews
Katie Andrews, Noemi Sinkovics and Rudolf R. Sinkovics
This chapter investigates the coffee value chain in Latin America. By drawing on the concept of just transitions as a “connective tissue” between the sustainable development goals…
Abstract
This chapter investigates the coffee value chain in Latin America. By drawing on the concept of just transitions as a “connective tissue” between the sustainable development goals (SDGs), the discussion zooms in on the promise of agroforestry for environmental upgrading. The chapter concludes by providing examples of trade-offs between environmental, social and economic aspects.
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The Empire Day Movement, which is associated with the Royal Empire Society, announces that with the object of inducing the Government to take effective action against the practice…
Abstract
The Empire Day Movement, which is associated with the Royal Empire Society, announces that with the object of inducing the Government to take effective action against the practice of selling blended butter, predominantly foreign, under labels and in packets which suggest English origin, a memorial has been signed by representative organisations and members of Parliament of all parties. The memorial, which has been sent to the President of the Board of Trade, the Minister of Agriculture, the Chairman of the Empire Marketing Board, and the Chairman of the Food Council, is as follows :—In the interests of the butter‐consuming public, as well as of agriculture and the promotion of Empire trade, we, the undersigned, call the attention of the Government to the continuance of certain practices to which allusion is made in the fourth report of the Imperial Economic Committee. In paragraph 243 the report says: Blended butter is at present sold under various proprietary brands. In certain cases these brands embody the names of counties or districts which are known to be important agricultural or dairying areas in the Home Country. The suggestion inevitably conveyed in such cases to the bulk of the consumers must be that such butter is of English origin.
The Sanitary Committee of a certain County Council, strong with the strength of recent creation, have lately been animated by a desire to distinguish themselves in some way, and…
Abstract
The Sanitary Committee of a certain County Council, strong with the strength of recent creation, have lately been animated by a desire to distinguish themselves in some way, and, proceeding along the lines of least resistance, they appear to have selected the Public Analyst as the most suitable object for attack. The charge against this unfortunate official was not that he is incompetent, or that he had been in any way negligent of his duties as prescribed by Act of Parliament, but simply and solely that he has the temerity to reside in London, which city is distant by a certain number of miles from the much favoured district controlled by the County Council aforesaid. The committee were favoured in their deliberations by the assistance of no less an authority than the “Principal” of a local “Technical School”;—and who could be more capable than he to express an opinion upon so simple a matter? This eminent exponent of scientific truths, after due and proper consideration, is reported to have delivered himself of the opinion that “scientifically it would be desirable that the analyst should reside in the district, as the delay occasioned by the sending of samples of water to London is liable to produce a misleading effect upon an analysis.” Apparently appalled by the contemplation of such possibilities, and strengthened by another expression of opinion to the effect that there were as “good men” in the district as in London, the committee resolved to recommend the County Council to determine the existing arrangement with the Public Analyst, and to appoint a “local analyst for all purposes.” Thus, the only objection which could be urged to the employment of a Public Analyst resident in London was the ridiculous one that the composition of a sample of water was likely to seriously alter during the period of its transit to London, and this contention becomes still more absurd when it is remembered that the examination of water samples is no part of the official duty of a Public Analyst. The employment of local scientific talent may be very proper when the object to be attained is simply the more or less imperfect instruction of the rising generation in the rudiments of what passes in this country for “technical education”; but the work of the Public Analyst is serious and responsible, and cannot be lightly undertaken by every person who may be acquainted with some of the uses of a test‐tube. The worthy members of this committee may find to their cost, as other committees have found before them, that persons possessing the requisite knowledge and experience are not necessarily indigenous to their district. Supposing that the County Council adopts the recommendation, the aspirations of the committee may even then be strangled in their infancy, as the Local Government Board will want to know all about the matter, and the committee will have to give serious and valid reasons in support of their case.
Karina Munari Pagan, Natália Munari Pagan and Vanessa Martins dos Santos
Propose a model that reports ethnocentrism, animosity, perceived quality and purchase intention in the evaluation of the country-of-origin effect for wine.
Abstract
Purpose
Propose a model that reports ethnocentrism, animosity, perceived quality and purchase intention in the evaluation of the country-of-origin effect for wine.
Design/methodology/approach
The sample for this study consisted of 154 students from the University of São Paulo Campus Ribeirão Preto and Piracicaba. Using scales already validated in the literature, a survey was carried out with 27 questions in the seven-point Likert format. The structural model was estimated using the partial least squares method.
Findings
It was verified that the country of origin positively influenced the purchase intention of wines, ethnocentrism positively influenced perceived quality, ethnocentrism positively influenced animosity, animosity negatively influenced the purchase intention and the country of origin positively influenced the perceived quality of the wine. It was verified that ethnocentrism did not influence purchase intention and the country of origin did not influence animosity.
Practical implications
As a managerial contribution, it helps managers to devise more effective strategies for the wine market.
Originality/value
An innovative model was proposed to investigate the role of animosity, ethnocentrism, perceived quality and purchase intention in evaluating the country-of-origin effect for wine.
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