Extending Object-Oriented Network Protocols via alternative Transportation Bindings (Web Services over XMPP)

Distributed and/or composite web applications are driven by intercommunication via web services, which employ application-level protocols, such as SOAP. However, these protocols usually rely on the classic HTTP for transportation. HTTP is quite efficient for what it does — delivering web page content, but has never been intended to carry complex web service oriented communication. Today there exist modern protocols that are much better fit for the job. Such a candidate is XMPP. It is an XML-based, asynchronous, open protocol that has built-in security and authentication mechanisms and utilizes a network of federated servers. Sophisticated asynchronous multi-party communication patterns can be established, effectively aiding web service developers. This paper’s purpose is to prove by facts, comparisons, and practical examples that XMPP is not only better suited than HTTP to serve as middleware for web service protocols, but can also contribute to the overall development state of web services.

Connecting social media to e-commerce:cold-start product recommendation using microblogging information

In recent years, the boundaries between e-commerce and social networking have become increasingly blurred. Many e-commerce websites support the mechanism of social login where users can sign on the websites using their social network identities such as their Facebook or Twitter accounts. Users can also post their newly purchased products on microblogs with links to the e-commerce product web pages. In this paper, we propose a novel solution for cross-site cold-start product recommendation, which aims to recommend products from e-commerce websites to users at social networking sites in 'cold-start' situations, a problem which has rarely been explored before. A major challenge is how to leverage knowledge extracted from social networking sites for cross-site cold-start product recommendation. We propose to use the linked users across social networking sites and e-commerce websites (users who have social networking accounts and have made purchases on e-commerce websites) as a bridge to map users' social networking features to another feature representation for product recommendation. In specific, we propose learning both users' and products' feature representations (called user embeddings and product embeddings, respectively) from data collected from e-commerce websites using recurrent neural networks and then apply a modified gradient boosting trees method to transform users' social networking features into user embeddings. We then develop a feature-based matrix factorization approach which can leverage the learnt user embeddings for cold-start product recommendation. Experimental results on a large dataset constructed from the largest Chinese microblogging service Sina Weibo and the largest Chinese B2C e-commerce website JingDong have shown the effectiveness of our proposed framework.

Perceptions of self-testing for chlamydia:understanding and predicting self-test use

Background: Self-testing technology allows people to test themselves for chlamydia without professional support. This may result in reassurance and wider access to chlamydia testing, but anxiety could occur on receipt of positive results. This study aimed to identify factors important in understanding self-testing for chlamydia outside formal screening contexts, to explore the potential impacts of self-testing on individuals, and to identify theoretical constructs to form a Framework for future research and intervention development. Methods: Eighteen university students participated in semi-structured interviews; eleven had self-tested for chlamydia. Data were analysed thematically using a Framework approach. Results: Perceived benefits of self-testing included its being convenient, anonymous and not requiring physical examination. There was concern about test accuracy and some participants lacked confidence in using vulvo-vaginal swabs. While some participants expressed concern about the absence of professional support, all said they would seek help on receiving a positive result. Factors identified in Protection Motivation Theory and the Theory of Planned Behaviour, such as response efficacy and self-efficacy, were found to be highly salient to participants in thinking about self-testing. Conclusions: These exploratory findings suggest that self-testing independently of formal health care systems may no more negatively impact people than being tested by health care professionals. Participants’ perceptions about self-testing behaviour were consistent with psychological theories. Findings suggest that interventions which increase confidence in using self-tests and that provide reassurance of test accuracy may increase self-test intentions.

Uncovering the root cause of ethnic difference in ability testing:differential test functioning, test familiarity and trait optimism as explanations of ethnic group differences

The present research represents a coherent approach to understanding the root causes of ethnic group differences in ability test performance. Two studies were conducted, each of which was designed to address a key knowledge gap in the ethnic bias literature. In Study 1, both the LR Method of Differential Item Functioning (DIF) detection and Mixture Latent Variable Modelling were used to investigate the degree to which Differential Test Functioning (DTF) could explain ethnic group test performance differences in a large, previously unpublished dataset. Though mean test score differences were observed between a number of ethnic groups, neither technique was able to identify ethnic DTF. This calls into question the practical application of DTF to understanding these group differences. Study 2 investigated whether a number of non-cognitive factors might explain ethnic group test performance differences on a variety of ability tests. Two factors – test familiarity and trait optimism – were able to explain a large proportion of ethnic group test score differences. Furthermore, test familiarity was found to mediate the relationship between socio-economic factors – particularly participant educational level and familial social status – and test performance, suggesting that test familiarity develops over time through the mechanism of exposure to ability testing in other contexts. These findings represent a substantial contribution to the field’s understanding of two key issues surrounding ethnic test performance differences. The author calls for a new line of research into these performance facilitating and debilitating factors, before recommendations are offered for practitioners to ensure fairer deployment of ability testing in high-stakes selection processes.

An incremental multilinear system for human face learning and recognition

This dissertation establishes a novel system for human face learning and recognition based on incremental multilinear Principal Component Analysis (PCA). Most of the existing face recognition systems need training data during the learning process. The system as proposed in this dissertation utilizes an unsupervised or weakly supervised learning approach, in which the learning phase requires a minimal amount of training data. It also overcomes the inability of traditional systems to adapt to the testing phase as the decision process for the newly acquired images continues to rely on that same old training data set. Consequently when a new training set is to be used, the traditional approach will require that the entire eigensystem will have to be generated again. However, as a means to speed up this computational process, the proposed method uses the eigensystem generated from the old training set together with the new images to generate more effectively the new eigensystem in a so-called incremental learning process. In the empirical evaluation phase, there are two key factors that are essential in evaluating the performance of the proposed method: (1) recognition accuracy and (2) computational complexity. In order to establish the most suitable algorithm for this research, a comparative analysis of the best performing methods has been carried out first. The results of the comparative analysis advocated for the initial utilization of the multilinear PCA in our research. As for the consideration of the issue of computational complexity for the subspace update procedure, a novel incremental algorithm, which combines the traditional sequential Karhunen-Loeve (SKL) algorithm with the newly developed incremental modified fast PCA algorithm, was established. In order to utilize the multilinear PCA in the incremental process, a new unfolding method was developed to affix the newly added data at the end of the previous data. The results of the incremental process based on these two methods were obtained to bear out these new theoretical improvements. Some object tracking results using video images are also provided as another challenging task to prove the soundness of this incremental multilinear learning method.

ALBA: A Political Tool for Venezuela’s Foreign Policy

Despite its founding by Hugo Chávez on the heels of the failed Free Trade Area for the Americas (FTAA) negotiations which took place November 2003, the Bolivarian Alliance for the Americas (ALBA, as it is known for its Spanish acronym) has evolved into a political tool that uses “social power” to facilitate Venezuela‟s positioning as the leader of the anti-U.S. agenda in the region. Fostering political favors and goodwill through the financing of social development projects, ALBA has created a political environment whereby countries on the take and their respective leaders seem deterred from taking public opposing viewpoints to Chávez. To that end, it has provided billions in economic aid to several nations in Latin American and the Caribbean, winning their favor and support for its policies. To date, ALBA counts on eight member nations. Besides Venezuela, it includes Antigua and Barbuda, Bolivia, Cuba, Dominica, Ecuador, Nicaragua, and Saint Vincent and the Grenadines. It also has several observer nations, among them, Grenada, Haiti, Paraguay, Uruguay, and a non-Latin American country, Syria. Throughout its recent history Venezuela has used its oil wealth to pursue political capital. Under the Chávez government it is doing so as part of a strategic effort countering the U.S. Following Cuba‟s demise in the region as the anti-American socialist camp leader, Chávez is attempting to step into Cuba‟s shoes, picking up where Cuba left off over a decade ago and has used the ALBA as a mechanism to help promote his foreign policy. Relying on its own resources, not those of the Soviet Union as Cuba once did, Venezuela has already shown its influence in the international arena, challenging U.S. positions at the Organization of American States (OAS), the United Nations, and even in matters having little if nothing to do with the region, such as Iran‟s nuclear proliferation. Taking advantage of Venezuela‟s oil prices bonanza, Chávez has been spreading economic aid throughout the region, funding several development projects. From stepping in to buy Bolivia‟s soy beans when the U.S. ceased doing so, to helping finance and construct an airport in Dominica, Venezuela‟s ALBA has provided assistance to many states in the region. As in the past, Venezuela has invested significantly both in time and money in the Caribbean, providing development assistance and oil at a discount to Haiti, St. Kitts and Nevis, and the Dominican Republic, although the latter two are neither member nor observer states of ALBA. The aid Chávez has been spreading around may be coming at a cost. It seems it has begun to cause cracks within the CARICOM community, where ALBA already counts on six of its 15 members, leading experts and leaders in the region to question traditional alliances to each other and the U.S. Yet, ALBA‟s ability to influence through aid is dependent on the Venezuelan economy. Its success hinges on continued Venezuelan oil sales at stable prices and the ability of Chávez to remain in power.

The Use of the Military for Law Enforcement Activities in Central America

Faced with the violence, criminality and insecurity now threatening peace and democratic governance in Central America, the region’s governments have decided to use the Armed Forces to carry out actions in response to criminal actions, looking to improve their performance. Although public demand for including the Armed Forces in these functions takes place within a legally legitimate framework, it is motivated by tangible circumstances such as increased levels of violence, delinquency and crime. Despite being coupled with the perception of institutional weakness within the security and judicial system (particularly police) and the recognition of prestige, efficiency, discipline and severity in fulfilling the Armed Forces’ missions, these arguments are insufficient to legitimize the use of the military as a police force. Within this context, this paper reflects on the implications or consequences of the use of the Armed Forces in duties traditionally assigned to the police in the Central American region with the goal of contributing to the debate on this topic taking place in the Americas. To achieve this end, first we will focus on understanding the actual context in which a decision is made to involve the Armed Forces in security duties in the region. Second, we will examine the effects and implications of this decision on the Armed Forces’ relations within their respective societies. Third and finally, considering this is already a reality in the region, this paper will provide recommendations. The main findings of this research, resulting from the application of an analyticaldescriptive and historically based study, are organized in three dimensions: the political dimension, by implication referring to the relationship between the ultimate political authority and the Armed Forces; the social dimension, by implication the opinion of citizens; and other implications not only affecting the structural and cultural organization of armies and police but also the complementary operational framework within a context of comprehensive response by the State. As a main conclusion, it poses there is an environment conducive to the use of the Armed Forces in citizen’s security, in view of the impact of threats provoked by criminal structures of a military nature currently operating in Central America. However, this participation creates an inevitable social and political impact if implemented in isolation or given a political leading role and/or operational autonomy. This participation poses risks to the institutions of the Armed Forces and the police as well. Finally, this paper identifies an urgent need for the Armed Forces’ role to be more clearly defined with regard to security matters, limiting it to threats that impact States’ governability and existence. Nonetheless, Central American States should seek a COMPREHENSIVE response to current crime and violence, using all necessary institutions to confront these challenges, but with defined roles and responsibilities for each and dynamic coordination to complement their actions.

A Fuzzy Preprocessing Module for Optimizing the Access Network Selection in Wireless Networks

A heterogeneous wireless network is characterized by the presence of different wireless access technologies that coexist in an overlay fashion. These wireless access technologies usually differ in terms of their operating parameters. On the other hand, Mobile Stations (MSs) in a heterogeneous wireless network are equipped with multiple interfaces to access different types of services from these wireless access technologies. The ultimate goal of these heterogeneous wireless networks is to provide global connectivity with efficient ubiquitous computing to these MSs based on the Always Best Connected (ABC) principle. This is where the need for intelligent and efficient Vertical Handoffs (VHOs) between wireless technologies in a heterogeneous environment becomes apparent. This paper presents the design and implementation of a fuzzy multicriteria based Vertical Handoff Necessity Estimation (VHONE) scheme that determines the proper time for VHO, while considering the continuity and quality of the currently utilized service, and the end-users' satisfaction.

A Method for Testing Object Localization as a Function of Eod Amplitude in the Weakly Electric Fish Brachyhypopomus Pinnicaudatus

I would like to thank Dr. Philip Stoddard for his patience and guidance throughout the past four years. He has not only taught me about behavior and electricity, but he has also taught me how to think scientifically. Vielka Salazar for making herself available to answer my questions and to help me with my projects. Montserrat Alfaro for providing me with support under times of frustration. Fabian A. Pal, who has often made himself available when I needed help to finish my projects, for being supportive, and for believing in me and my abilities. Most importantly, I would like to thank my parents who have shown tremendous support and patience during the past years. I would also like to thank the Honors Committee, specially Dr. Richards for taking the time to review my thesis and helping me modify it. Finally, I would like to thank the MARC program for providing me with financial assistance and the opportunity to perform this project.

Usability Testing at Florida International University Libraries: What We Learned

The Florida International University Libraries’ Web site’s new look was launched in Fall 2001. As a result of the new look, a group formed to undertake a usability study on the top page of the site. The group tested three target groups to determine the usability of the top page. The study pointed out some revisions for the top page; however, more importantly, it suggested areas for future research.

Comparison of Cardiovascular Disease Risk Factors between Single and Partnered Mothers: Data from the 2006 Health Survey of Adults and Children in Bermuda

Women are a high-risk population for cardiovascular diseases (CVD); however relationships between CVD and subpopulations of mothers are sparse. A secondary data analysis of the 2006 Health Survey of Adults and Children in Bermuda was conducted to compare the prevalence of CVD risk factors in single (n=77) and partnered (n=241) mothers. A higher percentage of single mothers were Black (p25 kg/m2 (p=0.01) and reported high blood pressure (p=0.004) and high cholesterol (0.017). Single mothers were nearly three times (OR=2.66) more likely to experience high blood pressure and two times (OR= 2.22) more likely to have high cholesterol. Single mothers may benefit from nutrition education programs related to lowering CVD risk.

Coccolithophore abundance and biometry in the South China Sea, 2014

Coccolithophore contributions to the global marine carbon cycle are regulated by the calcite content of their scales (coccoliths), and the relative cellular levels of photosynthesis and calcification. All three of these factors vary between coccolithophore species, and with response to the growth environment. Here, water samples were collected in the northern basin of the South China Sea (SCS) during summer 2014 in order to examine how environmental variability influenced species composition and cellular levels of calcite content. The vertical structure of the coccolithophore community was strongly regulated by mesoscale eddies. All living coccolithophores produced within the euphotic zone (1 % of surface irradiance), and Florisphaera profunda was a substantial coccolithophore and coccolith-calcite producer in the Deep Chlorophyll-a Maximum (DCM), especially in most oligotrophic anti-cyclonic eddy centers. Placolith-bearing coccolithophores, plus F. profunda, and other larger and numerically rare species made almost equal contributions to coccolith-based calcite in the water column. For Emiliania huxleyi biometry measurements, coccolith size positively correlated with nutrients, and it is suggested that coccolith length is influenced by nutrient and light related growth rates. However, larger sized coccoliths were related to low pH and calcite saturation, although it is not a simple cause and effect relationship. Genotypic or ecophenotypic variation may also be linked to coccolith size variation.

Uso didático do Facebook como estratégia de leitura para o gênero textual poesia

The poor performance of students in reading and writing activities, prompted the search for actions that would minimize this problem, noticeable mainly in public education. The lack of interest in reading of poetic texts seen in students from the 7th year in a public school in RN, has led us to question the reasons for the rejection of poetry. Thus, the idea to organize and develop new reading possibilities mediated by digital technologies, considering the preference of teenagers by virtual environments. Therefore, it was essential to observe how students used web resources in order to plan actions that aimed to improve their reading performance. We present to justify the need for reflection on the educational problems starting from our reality, in order to establish appropriate procedures to minimize them. To this end, we draw is to investigate how students appropriated the Facebook social network in order to elaborate reading strategies using this platform. The study is anchored in the reflections of the following theorists and researchers: language concepts and language: Bakhtin (2011 [1979] 2006 [1999]), Bronckart (2012 [1999]), Marcuschi (2008); reading strategies: Leffa (1996) Solé (1998), Antunes (2009), Kleiman (2013); genre: Bakhtin (2011 [1979] 2006 [1999]), Marcuschi (2008); didactic sequence: Dolz, Noverraz and Schneuwly (2013 [2004]); technologies: Moran (2008 [2000]), Kenski (2007), Bento (2012), Behrens (2013); literary literacy: Cosson (2007); other theoretical orientations: PCN (1998), PDE (2008), Perrenoud (1999), among others. The methodology followed action research guidelines, a qualitative approach perspective. The research instruments included questionnaires, interviews, observations and field notes. The results pointed to the interest of students in this social network, which favored the development of a didactic sequence whose activities converged on the didactic use of Facebook as a support for the presentation of textual poetry genre, drawing the attention of students for reading. Thus, we reiterate the need to include the pedagogical use of Information and Communication Digital Technologies educational activities to better meet the expectations of the generation of "digital natives", offering them a significant Portuguese-speaking school that fits your interests.

Uso didático do Facebook como estratégia de leitura para o gênero textual poesia

The poor performance of students in reading and writing activities, prompted the search for actions that would minimize this problem, noticeable mainly in public education. The lack of interest in reading of poetic texts seen in students from the 7th year in a public school in RN, has led us to question the reasons for the rejection of poetry. Thus, the idea to organize and develop new reading possibilities mediated by digital technologies, considering the preference of teenagers by virtual environments. Therefore, it was essential to observe how students used web resources in order to plan actions that aimed to improve their reading performance. We present to justify the need for reflection on the educational problems starting from our reality, in order to establish appropriate procedures to minimize them. To this end, we draw is to investigate how students appropriated the Facebook social network in order to elaborate reading strategies using this platform. The study is anchored in the reflections of the following theorists and researchers: language concepts and language: Bakhtin (2011 [1979] 2006 [1999]), Bronckart (2012 [1999]), Marcuschi (2008); reading strategies: Leffa (1996) Solé (1998), Antunes (2009), Kleiman (2013); genre: Bakhtin (2011 [1979] 2006 [1999]), Marcuschi (2008); didactic sequence: Dolz, Noverraz and Schneuwly (2013 [2004]); technologies: Moran (2008 [2000]), Kenski (2007), Bento (2012), Behrens (2013); literary literacy: Cosson (2007); other theoretical orientations: PCN (1998), PDE (2008), Perrenoud (1999), among others. The methodology followed action research guidelines, a qualitative approach perspective. The research instruments included questionnaires, interviews, observations and field notes. The results pointed to the interest of students in this social network, which favored the development of a didactic sequence whose activities converged on the didactic use of Facebook as a support for the presentation of textual poetry genre, drawing the attention of students for reading. Thus, we reiterate the need to include the pedagogical use of Information and Communication Digital Technologies educational activities to better meet the expectations of the generation of "digital natives", offering them a significant Portuguese-speaking school that fits your interests.

A ROS-based Workspace Control and Trajectory Planner for a seven degrees of freedom Robotic arm

In this Bachelor Thesis I want to provide readers with tools and scripts for the control of a 7DOF manipulator, backed up by some theory of Robotics and Computer Science, in order to better contextualize the work done. In practice, we will see most common software, and developing environments, used to cope with our task: these include ROS, along with visual simulation by VREP and RVIZ, and an almost "stand-alone" ROS extension called MoveIt!, a very complete programming interface for trajectory planning and obstacle avoidance. As we will better appreciate and understand in the introduction chapter, the capability of detecting collision objects through a camera sensor, and re-plan to the desired end-effector pose, are not enough. In fact, this work is implemented in a more complex system, where recognition of particular objects is needed. Through a package of ROS and customized scripts, a detailed procedure will be provided on how to distinguish a particular object, retrieve its reference frame with respect to a known one, and then allow navigation to that target. Together with technical details, the aim is also to report working scripts and a specific appendix (A) you can refer to, if desiring to put things together.