J. Guillermo Lopez-Lara, Mauro Eduardo Maya, Alejandro González, Antonio Cardenas and Liliana Felix
The purpose of this paper is to present a new vision-based control method, which enables delta-type parallel robots to track and manipulate objects moving in arbitrary…
Abstract
Purpose
The purpose of this paper is to present a new vision-based control method, which enables delta-type parallel robots to track and manipulate objects moving in arbitrary trajectories. This constitutes an enhanced variant of the linear camera model-camera space manipulation (LCM-CSM).
Design/methodology/approach
After obtaining the LCM-CSM view parameters, a moving target’s position and its velocity are estimated in camera space using Kalman filter. The robot is then commanded to reach the target. The proposed control strategy has been experimentally validated using a PARALLIX LKF-2040, an academic delta-type parallel platform and seven different target trajectories for which the positioning errors were recorded.
Findings
For objects that moved manually along a sawtooth, zigzag or increasing spiral trajectory with changing velocities, a maximum positioning error of 4.31 mm was found, whereas objects that moved on a conveyor belt at constant velocity ranging from 7 to 12 cm/s, average errors between 2.2-2.75 mm were obtained. For static objects, an average error of 1.48 mm was found. Without vision-based control, the experimental platform used has a static positioning accuracy of 3.17 mm.
Practical implications
The LCM-CSM method has a low computational cost and does not require calibration or computation of Jacobians. The new variant of LCM-CSM takes advantage of aforementioned characteristics and applies them to vision-based control of parallel robots interacting with moving objects.
Originality/value
A new variant of the LCM-CSM method, traditionally used only for static positioning of a robot’s end-effector, was applied to parallel robots enabling the manipulation of objects moving along unknown trajectories.
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Hernan Ramirez-Asis, Jorge Castillo-Picon, Jenny Villacorta Miranda, José Rodríguez Herrera and Walter Medrano Acuña
Financial inclusion in Peru has been addressed through coverage, quality of financial services, movement of transactions, and service points. The purpose of this chapter is to…
Abstract
Financial inclusion in Peru has been addressed through coverage, quality of financial services, movement of transactions, and service points. The purpose of this chapter is to evaluate for the department of Ancash, Peru, the link between financial inclusion and its socioeconomic factors. Socioeconomic variables and financial inclusion of the Ancash department of the National Household Survey are taken as indicators, later contrasted through the logit model, with the financial inclusion variable being the explained variable.
There is evidence of positive and negative relationships between financial inclusion and socioeconomic variables; these are important components for planning financial inclusion. Raising the levels of formal employment, the educational level and considering the area of residence would be a strategy to generate a dynamic of inclusion in the department of Ancash.
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Commenting on the Mexican Revolution in 1938, Trotsky argued that the country might achieve “national independence,” understood as a break with dependency relations. Whether this…
Abstract
Commenting on the Mexican Revolution in 1938, Trotsky argued that the country might achieve “national independence,” understood as a break with dependency relations. Whether this might occur depended – Trotsky continued – on “international factors.” Though not engaging with Mexico, Antonio Gramsci made a similar theoretical point. It is hence from this perspective that this chapter analyses the Mexican Revolution, asking whether it led to a break in dependency relations and the attainment of “national independence” or what I refer to as “relative geopolitical autonomy.” Presenting a framework of analysis largely based on the work of Gramsci that highlights its continuity with the thought of Marx, the chapter will answer negatively to this question. The chapter starts from the idea that Porfirio Díaz’s regime was unable to adapt the economic structure (still pre-capitalist) to the complex superstructures (capitalist), that is, to realize an historic bloc. It would be this job that the emergent Mexican bourgeoisie sought to finish. However, the situation is complicated by the powerful emergence of social movements from below, constituted largely by landless peasants, and to a lesser extent, the industrial proletariat. I will therefore argue that the revolution has been both “passive” and “bounded.” The term passive revolution will be applied to the last phase of the revolution as the emerging bourgeoisie successfully coopted the demands of the popular masses thereby “passivizing” them. But crucially, the revolution was also “bounded” because international factors, and especially US influence, played a conditioning role throughout the revolutionary process. At the same time, it would be the very “passive” nature of the revolution that would contribute to the reproduction of relations of dependency. Hence the chapter concludes that the period Trotsky commented upon (the Cárdenas period) is the highest level of “independence” Mexico achieved, only to decrease again over the years.
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As has been widely recognized in the literature, the post‐war economic boom which drew to a close by the early 1970s has been followed by an intense period of industrial…
Abstract
As has been widely recognized in the literature, the post‐war economic boom which drew to a close by the early 1970s has been followed by an intense period of industrial restructuring characterized by marked instability in all three major spheres of economic activity: production, distribution, and finance. This process has taken place both at the global level and at the level of national economies (Cardenas, 1990). It reflects a profound change in the mode of capitalist accumulation. Prior to the current round of restructuring, accumulation was taken to be principally the inward‐oriented task of each nation's own economy. Now, it seems that successful capital accumulation (i.e. development) depends most upon a nation's competitive integration into the world market for goods and services (Garrido, 1995). The present mode of accumulation implies an opening of national economies to international trade in commodities and capital, both among the advanced industrial nations and between the industrialized and the newly‐industrializing countries. This has generated a heightened degree of competition among countries and among firms, given that the easy movement of capital, goods, and services has allowed for real competition to emerge among dispersed places around the globe based upon their comparative financial and productive advantages.
Cory Hallam, Gianluca Zanella, Carlos Alberto Dorantes Dosamantes and Cesar Cardenas
The purpose of this paper is to investigate the influence of temporal construal theory on entrepreneurial intention models using a three-country study. Inclusion of temporal…
Abstract
Purpose
The purpose of this paper is to investigate the influence of temporal construal theory on entrepreneurial intention models using a three-country study. Inclusion of temporal construal theory in intent models would suggest path dependent influence on intent, and more specifically, that intent may be subdivided into temporally based categories, broadly codified as short-term and long-term intent.
Design/methodology/approach
A quasi-experimental study of 1,046 university students in business and engineering from the USA, Mexico, and Spain was conducted. A temporal construal model of intent is proposed, including measures of short-term and long-term intent. Entrepreneurial self-efficacy (ESE), part of the perceived behavioral control in the theory of planned behavior, is utilized to structure the model antecedents.
Findings
The results suggest the existence of differences in individual entrepreneurial intent measures depending on the individual’s perception of when the entrepreneurial event is anticipated to occur in their lives. Utilizing an ESE construct, the authors demonstrated that short-term entrepreneurial intent significantly mediates the effect of ESE on long-term entrepreneurial intent. Furthermore, the results identify a mediating model that does not depend on regional country differences, thus supporting the generalizability of the findings.
Originality/value
The paper bridges temporal construal theory and entrepreneurial intentions to qualify the path dependent effects of this psychological phenomena and its impact on identifying nascent entrepreneurs. The multi-country results indicate the ability to generalize the findings into a more complete theoretical model of entrepreneurial intention and suggests potential improvements in predictive models that currently use single or averaged measures of entrepreneurial intent.
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Asael Islas-Moreno, Daniel Emigdio Uriza-Ávila, Ana Lieseld Guzmán-Elizalde and Gabriel Aguirre-Álvarez
The study aims to analyze the effect of the previous preparation and the work carried out in the field during a study trip on the development of competencies in agribusiness…
Abstract
Purpose
The study aims to analyze the effect of the previous preparation and the work carried out in the field during a study trip on the development of competencies in agribusiness students.
Design/methodology/approach
The destination was the pineapple area of the Papaloapan Lower Basin in Mexico, and 42 students from 6 different semester levels participated. The students answered a test prior to the trip, received an evaluation for their activities in the field and prepared reports and posters as products of the experience. The relationship between the scores obtained was examined through a comparative analysis.
Findings
The findings are framed in the cyclical model of experiential learning with four stages (feeling, watching, thinking and doing) by Kolb (1984). It is found that the acquisition of specific knowledge about what the experience will entail leads to better preparation, motivation and confidence to live the experience (potentiation of feeling and watching). In turn, specific knowledge and better use of experience promote the development of problem solving, interpersonal and communication skills (potentiation of thinking and doing).
Research limitations/implications
Statistical representativeness is not a quality of the study since it is based on a comparative analysis.
Originality/value
The study analyzes an educational component of great value in the business area, about which little is known in the agribusiness subarea.
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Luis Ricardo Jacobo, Rafael Garcia, Victor Hugo Lopez and Antonio Contreras
The purpose of this paper is to study the effect of heat treatment (HT) applied to an API X60 steel in corrosion resistance and stress corrosion cracking (SCC) susceptibility…
Abstract
Purpose
The purpose of this paper is to study the effect of heat treatment (HT) applied to an API X60 steel in corrosion resistance and stress corrosion cracking (SCC) susceptibility through slow strain rate tests (SSRT) in NS4 solution and congenital water (CW) to assess external and internal SCC, respectively.
Design/methodology/approach
API X60 steel was heat treated at a temperature of 1,200°C for 30 min followed by water quenching. Specimens from this steel were machined according to NACE TM 198. SSRT were performed in a constant extension rate tests (CERT) machine at room temperature at a strain rate of 1 × 10–6 s–1. For this purpose, a glass cell was used. Corrosion behavior was evaluated through polarization curves (PCs).
Findings
The SCC index obtained from SSRT indicates that the steel heat treated could be susceptible to SCC in CW and NS4 solution; the mechanism of SCC was hydrogen embrittlement. Thus, CW may promote the SCC phenomenon in pipelines. HT improves the steel corrosion resistance. Higher corrosion rate (CR) was observed when the steel is exposed to CW. The corrosion process in X60 steel shows that the oxidation reaction in the anodic branch corresponds to an activation process, and the cathode branches reveal a diffusion process.
Originality/value
The purpose of the heat treatment applied to X60 steel was to generate a microstructure of acicular ferrite to improve the corrosion resistance and SCC behavior.
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Cristian Armando Yepes-Lugo, Robert Ojeda-Pérez and Luz Dinora Vera-Acevedo
This paper aims to evaluate the evolution of the organizational field in the Colombian coffee industry between 1960 and 2020 and explain how peripheral actors influenced…
Abstract
Purpose
This paper aims to evaluate the evolution of the organizational field in the Colombian coffee industry between 1960 and 2020 and explain how peripheral actors influenced institutional change.
Design/methodology/approach
The methods analyze historical processes from a hermeneutical and interpretative perspective. The authors used data collection techniques through interviews, archive data, publications and media reports, embracing an interdisciplinary and qualitative documentary approach. This approach helps the authors unravel the temporal dimensions of the historical discourse related to coffee and the involvement of various actors within organizational structures.
Findings
The authors found that, unlike the literature regarding the change in organizational fields, recently, within the coffee sector in Colombia, the institutional work of peripheral actors (small producers, local associative groups and coffee women, among others) is changing the field as follows: (1) women are changing traditional behaviors moving from hierarchical family structures and lack of gender awareness, to empowered, horizontal and sustained relationships, (2) indigenous people include rituals and other traditional practices in coffee production and (3) ex-guerrilla members are helping to strengthen the peace process implementation in Colombia through coffee production.
Research limitations/implications
The authors did not conduct statistical or computational analysis to simulate the emergence of new organizational forms. Instead, the authors attempted to elucidate narratives and discourses that reflect the tensions between central and peripheral actors from a historical perspective.
Practical implications
This study seeks to help leaders and managers overcome processes or organizational change in which peripheral actors are crucial. From that perspective, allocating resources and capabilities can become more effective.
Originality/value
This paper offers a new perspective of change within organizational fields from the roles of peripheral actors, which are fundamental in change processes within organizational fields, especially in the global south, where tensions between elites and vulnerable people are familiar.