Salesian Journal on Information Systems

11-19

Authors: E SILVA, G. M.; DA SILVA, N. F. F.; DIAS, M. S.

Abstract: Machine learning techniques can be used to automatically infer information that is not available from large volumes of data. Social networks have been gaining popularity and turning into an important sources of data for an application of computer techniques. The goal of this work is to study how well preprocessing techniques, feature sets and classifiers work on the task of automatic bullying trace detection, as well as the role of the author of the text on the reported episode.We focused on social networks texts written in Brazilian Portuguese. Several different classifiers and attribute sets were studied and compared, in order to identify which one is the most appropriate for this task. Among all tested configurations, the best results was found when using the largest trainning set transformed into a feature set made of unigrams and bigrams in conjunction with SVM with an RBF kernel

35-50

Authors: RIBEIRO, M. R. C., SANTOS, J. C., OLIVEIRA-JR, A. C.

There are some curves, namely, the Cycloid, the Conchoid of Nicomedes, the Pascal limaçon, the trisectrix of Hippias and the cissoid of Diocles, which have been studied over many centuries because of heir properties. In this work, we report some properties of those curves which are fundamental to the discussion of antiquity problems. We also analyzed, implemented and simulated the main properties of the cycloid curve and the three classical problems of Greek geometry in dynamic geometric open source software.

59-73

Authors: SOUZA, D.F., ABRAHÃO, D.C., VIEIRA, F.H.T, BORGES, V.C.M.

With the development of the next generation of mobile communications systems for 5G, several technologies are being studied in order to reach the new requirements in new application scenarios. Among them, is the use of new modulations with higher spectral eficiency in substitution of OFDM, such as F-OFDM and UFMC, and also the scheduling algorithms which are in charge of sharing resources between users. In this article, we evaluated the application of F-OFDM and UFMC, 5G modulations candidates, on LTE downlink as compared to OFDM and evaluated the Round Robin, QoS Guaranteed and PSO schedulers dealing with additional resources provided by the tested modulations. To reach this, we compared performance considering parameters like fairness, latency, throughput and spectral eficiency. The results showed that the downlink LTE improved performance in all evaluated parameters with UFMC modulation. In fact, there was a performance improvement in all the schedulers evaluated. For example, PSO based scheduler improved latency and throughput while QoS Guaranteed reached the lowest loss, and the highest fairness were reached by QoS Guaranteed and Round Robin.

10-19

Authors: SANTOS, R. Y. C., MORENO, E. D., NUNES, M. A. S. N.

The electrical power quality monitoring has been a recurring theme due to the growth in the expense, mainly inside the industries, caused by equipments failure because of the electrical disturbances. In this context, the use of embedded systems, with its low cost and high performance, have growth, what has allowed the monitoring of the electrical networks be made more efficiently. Hence, this paper shows a systematic literature map, where 552 papers were mapped and 56 were selected to study and analyze the research questions: which are the methods/algorithms most used to detect and/or classify disturbances?, which are the embedded platform most used?, and which are the disturbances more addressed in the literature?

38-45

Authors: PERINA, A. B.; ARANTES, J. S.; BONATO, V.

Although quite important in the parallel computing area, Field-Programmable Gate Arrays (FPGAs) have a restricted application space when compared to other technologies such asGraphic Processing Units (GPUs) or manycore processors. However, FPGAs have some specific features (e.g. dynamic partial reconfiguration) that may benefit certain applications. Dynamic partial reconfiguration, however, may present prohibitive times (milliseconds). This article presents a simple virtual FPGA architecture capable of holding different configurations (contexts) and also capable of switching between those contexts in a single clock cycle. Experiments have shown that storing 4 different contexts increased in 2X the amount of used logic resources. However, the virtualisation overload - relation between used physical logic resources and the implemented virtual logic resources - was 269,9X in average for experiments with just 1 context.

16-33

Authors: MANTAU, M. J., RIZZATTI, R., BERKENBROCK, G. R., BERKENBROCK, C. D. M.

Mobile devices limitations, especially its reduced screen dimension, complicates information presentation and manipulation. In this context, this work investigates techniques for visualization and filtering of awareness information in mobile groupwares. The research was based on a collaborative game titled Warming Up The Brain. We used the action-research method and applied visualization techniques of awareness information in the collaborative game. Based on the filtering techniques it was possible to build anWYSIWIS (What You See Is What I See) context-awarecinterface . Thus, the collaborative game automatically adjusts the content displayed on the screen based on contextual information

42-52

Authors: REIS, M V. S. de A., WEITZEL, L.

This paper aims to evaluate the use of machine learning techniques in a database of marine accidents. We analyzed and evaluated the main causes and types of marine accidents in the Northern Fluminense region. For this, machine learning techniques were used. The study showed that the modeling can be done in a satisfactory manner using different configurations of classification algorithms, varying the activation functions and training parameters. The SMO (Sequential Minimal Optimization) algorithm showed the best performance result.

7

Authors: Castilhos, S.; Woloszyn, V,; Barno, D. ; Wives, L. K.

Readability assessment is an important task in automatic text simplification that aims identify the text complexity by computing a set of metrics. In this paper, we present the development and assessment of an open source library called Pylinguistics to readability assessment of texts written in Portuguese. Additionally, to illustrate the possibilities of our tool, this work also presents an empirical analysis of readability of Brazilian scientific news dissemination.

15

Authors: PLÁCIDO DA SILVA, L. S.; SAMPAIO, S. C. B.; MOREIRA, L. T.; VASCONCELOS, A. M. L.

Several initiatives have emerged in the search for improvement of software processes in recent years. These initiatives are usually guided by Standards, Models and Quality Standards, aiming to establish best practices to guide the definition of processes and support the assessment of the maturity and capacity of organizations in the development of software products and provision of IT services. Despite the emergence of several initiatives, when the topic refers to the processes of contracting information technology (IT) solutions by the Brazilian Federal Public Administration (APF), its application in the context of organizations has obstacles, such as the complexity of the processes and oversight of federal government agencies. In order to overcome these obstacles, the Court of Audit of the Union (TCU) recommended the preparation of the SLTI/MPOG 04/2014 Normative Instruction, containing guidelines for the process of contracting IT Solutions. This work defines a Mapping Method between IN/SLTI/MPOG 04/2014 and APF's IT Solutions Procurement Guide (GCSTI), with the objective of identifying the maturity and adherence of GCSTI to CMMI-ACQ, CMMI -DEV and CMMI-SVC. This work defines a Mapping Method between IN / SLTI / MPOG 04/2014 and its processes defined in the APF IT Solutions Procurement Guide (GCSTI), with the objective of identifying the maturity and adherence of the GCSTI to the Models CMMI-ACQ, CMMI-DEV and CMMI-SVC and bringing as benefits a systematized and structured methodology to apply and map models, norms and standards of any nature. As a result of this research, the mapping method created allowed the mapping between the CMMI and GSTI models of IN / SLTI / PMO 04/2014, and the method could be applied in any other mapping, from which the processes were oriented to the same Structure and had similar objectives.

58-65

Authors: SILVA JUNIOR,J. B..; MORENO, E. D.; NUNES, M. A. S. N.

The Intrusion Detection System (IDS) needs to compare the contents of all packets arriving at the network interface with a set of signatures for indicating possible attacks, a task that consumes much CPU processing time. In order to alleviate this problem, some researchers have tried to parallelize the IDS's comparison engine, transferring execution from the CPU to GPU. This paper identifies and maps the parallelization features of the Aho-Corasick algorithm, which is used in Snort to compare patterns, in order to show this algorithm's implementation and execution issues, as well as optimization techniques for the Aho-Corasick machine. We have found 147 papers from important computer science publications databases, and have mapped them. We selected 22 and analyzed them in order to find our results. Our analysis of the papers showed, among other results, that parallelization of the AC algorithm is a new task and the authors have focused on the State Transition Table as the most common way to implement the algorithm on the GPU. Furthermore, we found that some techniques speed up the algorithm and reduce the required machine storage space are highly used, such as the algorithm running on the fastest memories and mechanisms for reducing the number of nodes and bit maping.

6

Authors: LIMA, L. M; CARDOSO, L. R.

The museum is a place of preservation and elucidation in the history of a group of people; it exposes the past, contextualizes the present and takes us to a prospective vision. Studies show that even though they are in rise, virtual museums would tend to fail due to the lack of interest between the public and the collection. The objective of this research was to select Wiki tools that meet the criteria to provide more interactivity in an virtual museum.

8

Authors: PINTO, M. L.; MENDES, A. H. D.; DRUMOND, L. C. D; NALDI, M. C.

The automation systems together with web and mobile control is a facilitator of the various processes in several areas, among them the agricultural sector. Specically in the irrigation management, the lowest cost technology is not able to satisfy the farmer's needs, which are the correct water supply to plants and remote monitoring of the irrigation. The objective of this paper is to present a system for controlling and monitoring irrigation with a multiplatform support for both desktop and web/mobile. The system is designed to realize automatic irrigation management in order to provide the exact amount of water needed for culture, avoiding water stress both the culture and the waste of resources such as water and electricity. Additionally, the system allows remote monitoring from anywhere by means of a computer and/or mobile device by internet. This work was developed during the undergraduate mentorship of the authors.