Review of stud shear resistance prediction in steel-concrete composite beams

Jorge Bonilla,Luciano M. Bezerra,Enrique Mirambell,Bruno Massicotte 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.27 No.3

In steel-concrete composite beams, longitudinal shear forces are transferred across steel flange-concrete slab interface by means of shear connectors. The connector behavior is highly non-linear and involves several complex mechanisms. The design resistance and stiffness of composite beams depends on the shear connection behavior and the accuracy in the connector resistance prediction is essential. However determining the stud shear resistance is not an easy process: analytical methods do not give an adequate response to this problem and it is therefore necessary to use experimental methods. This paper present a summary of the main procedures to predict the resistance of the stud shear connectors embedded in solid slab, and stud shear connectors in composite slab using profiled steel sheeting with rib perpendicular to steel beam. A large number of experimental studies on the behavior of stud shear connectors and reported in the literature are also summarized. A comparison of the stud shear resistance prediction using six reference codes (AISC, AASHTO, Eurocode-4, GB50017, JSCE and AS-2327.1) and other procedures reported in the literature against experimental results is presented. From this exercise, it is concluded that there are still inaccuracies in the prediction of stud shear resistance in all analysed procedures and that improvements are needed.

21st Challenges to Latin America and New Perspectives : Session 3 / Democracy in Latin America ; The Andean Security Agenda at The Beginning of The Century

(Adrian Bonilla) 한국라틴아메리카학회 2000 한국라틴아메리카학회 2000 년 국제학술대회 Vol.- No.-

Articles : The Andean Security Agenda at The Beginning of the century

(Adrian Bonilla) 한국라틴아메리카학회 2000 Korean Journal of Latin American Studies Vol.3 No.-

EXTERNAL VULNERABILITIES AND ECONOMIC INTEGRATION: IS THE UNION OF SOUTH AMERICAN NATIONS A PROMISING PROJECT?

ANDREA BONILLA BOLAÑOS 중앙대학교 경제연구소 2014 Journal of Economic Development Vol.39 No.2

This study examines the reactions of the Union of South American Nations (UNASUR) economies to external shocks. By using a structural vector autoregression approach, it measures the impact of three external shocks (monetary, commercial, and financial) in the real, monetary, and fiscal economic sectors of seven UNASUR economies, namely Argentina, Bolivia, Brazil, Chile, Colombia, Peru, and Venezuela, and investigates co-movement paths. The results show a non-negligible degree of synchronization across the studied economies, confirming their high external vulnerability. They also suggest that irrespective of size or integration degree, all UNASUR members share mutual weaknesses, which they must fight to overcome.

The Andean Security Agenda at The Beginning of the century

Adrian Bonilla 한국라틴아메리카학회 2000 라틴아메리카연구 Vol.13 No.2

Building Science, Technology, and Research Capacity in Developing Countries

Kleinsy Bonilla,Sergio Salles-Filho,Adriana Bin 과학기술정책연구원 2018 STI Policy Review Vol.9 No.1

Developing countries face numerous challenges in the process of building science, technology, and research capacity; in particular, the formation and accumulation of skilled S&T workforce. The lack of organized and sustainable higher education options (Master and Doctoral programs), nonexistent or low-quality academic programs, and the absence of research-oriented study options are some of the strong contributors for talented students to emigrate to developed countries. At the same time, the consolidation of a global knowledge economy, the internationalization of higher education, and the competition to attract foreign talent in industrialized countries present challenges for underdeveloped nations to retain their already scarce skilled human resources. In this context, student mobility has been used as a policy mechanism to cope with S&T workforce shortages in S&T laggard nations. It has also enabled opportunities for international cooperation to play a key role. While significant literature has been devoted to studying the gains of developed nations with the arrival and potential migration of the mobilized students, few scholarly inquiries have addressed the benefits and losses experienced by their countries of origin. More importantly, limited research can be found on policy options and policy implications for developing countries to deal with the dilemmas presented by the brain-drain/brain-circulation debate. The goal of this article is to study empirical evidence of an international cooperation initiative for student mobility between the Republic of Korea and Guatemala (implemented during 2009–2015). The paper analyzes this particular international cooperation experience from the perspective of the different actors involved and attempts to draw policy implications and policy options for developing countries to deal with potential risks and gains derived from international mobility for their S&T capacity building.

Challenges of Highly Educated Human Resources in Guatemala

Kleinsy Bonilla,Jae Sung Kwak 한국라틴아메리카학회 2014 라틴아메리카연구 Vol.27 No.3

This article attempts to provide a critical valuation of the availability, formation and best use of national highly educated human resources (HEHHRR) in Guatemala. HEHHRR, for the purpose of this article, is understood in terms of educational attainment and skills development among the population; ultimately framed in higher education. Focus has been placed on individuals graduated from fourth-level academic programs (master, doctoral degrees). The authors start by providing an overview of the country context; subsequent sections reflect on the development profile of Guatemala and the challenges faced by its domestic higher education system which hinder its ability to comply with its role in the production of the needed HEHHRR for the development of the nation. Findings provide evidence of the scarcity of HEHHRR in Guatemala as well as the existence of conditions that make it unlikely to produce them domestically. In addition, different elements of the work scenario limit the best use of the Guatemalan HEHHRR. Therefore, this study strives to provide a better insight into the HEHHRR of Guatemala, the importance of international cooperation to address shortcomings at the domestic level, and suggests various topics for future research.

Political Economy and Its Application in Latin America: A Review

Claudio A. Bonilla,Juan Pablo Couyoumdjian,Leonardo A. Gatica 한국라틴아메리카학회 2012 라틴아메리카연구 Vol.25 No.4

This article reviews some contributions of two important research areas in political economy which were developed mainly in the US and Europe. Our purpose is to examine some applications of these theories in Latin American countries. Since the complex relationship between economics and politics becomes all the more complicated when the institutional setting does not provide political stability, it is interesting to study if the political economy models developed in the first world are also applicable to Latin America. We conclude that in great part the models developed are consistent with the empirical findings in Latin America. However, much work still has to be done and special consideration must be given to the institutional features of the Latin American countries.

The interaction of Instagram followers in the fast fashion sector: The case of Hennes and Mauritz (H&M)

María Del Rocío Bonilla,José Luis del Olmo Arriaga,David Andreu 한국마케팅과학회 2019 Journal of Global Fashion Marketing Vol.10 No.4

The aim of this study is to analyse the interactions between fashion brands and their followers on social networks, focusing on empirically determining the relationship established between the fast fashion company H&M and its users on the social network Instagram. This analysis focuses on determining the type of post that generates greater engagement for the company’s Instagram account. Therefore, a classification and subsequent statistical treatment of the content of the posts of this account was carried out throughout 2017. Three categorization systems were used for this analysis in order to determine engagement from the point of view of the content of the message, the company’s communication strategy, and formal aspects and product category presented in the post. To date, research on the interaction of fashion brands with users on social networks has focused primarily on other platforms of social interaction other than Instagram. In contrast, this study makes an important contribution to research on the interaction of a fast fashion brand with users of the most specialized social network in this sector.

A novel sensor for the detection of n-butanol based on CoMn2O4 nanoparticles

Juan Pablo Morán-Lázaro,Maykel Courel-Piedrahita,Alex Guillén-Bonilla,Florentino López-Urías,Héctor Guillén-Bonilla,Víctor Manuel Soto-García,Aldo Palafox-Corona,David Alberto Hernández-Poot 대한금속·재료학회 2024 ELECTRONIC MATERIALS LETTERS Vol.20 No.5

In this paper, we studied the alcohol-sensing properties of CoMn 2 O 4 nanoparticles for the fi rst time. The CoMn 2 O 4nanoparticles were prepared via a simple microwave-assisted colloidal method using cobalt nitrate, manganese nitrate,dioctyl sulfosuccinate sodium salt, and ethylene glycol as a solvent. Various techniques were used to characterize the structural,morphological, and optical properties of CoMn 2 O 4 . The crystal structure of CoMn 2 O 4 was found after calcinationat a temperature of 400 °C. The Raman spectrum showed seven vibrational bands, while the optical absorption spectrumshowed three bands, confi rming the spinel CoMn 2 O 4 . Morphological analysis revealed that the porous microstructure ofCoMn 2 O 4 was composed of nanoparticles with a size distribution of 16 to 58 nm. Gas sensors were fabricated with theCoMn 2 O 4 powders calcined at 400 °C using the brush-coating method, and experimental results showed that CoMn 2 O 4nanoparticles were more sensitive to n -butanol than isopropanol and ethanol at an operating temperature of 185 °C. TheCoMn 2 O 4 sensor showed a response of 6.6 at 50 ppm n -butanol with good stability, reproducibility, and repeatability. The present article provides a new sensing material that could be used as an n -butanol sensor with signifi cant benefi tsfor human health.