Salesian Journal on Information Systems

2-9

Authors: ALVES, M. A., SOUZA, L. T. F.

Smartphone users' satisfaction is related to several factors of interaction that represent criteria evaluated in the choice of the operating system. This paper investigates the usage satisfaction of Android, iOS and Windows Phone mobile operating systems users' and deals with multicriteria decision making. A survey was applied and 314 answers were obtained. The evaluated criteria and the scores obtained through the survey were the initial parameters for the multicriteria decision-making method TOPSIS. The method classified the three alternatives based on preferences over screen, terminology, learning and system capabilities. The iOS was the best classied in the proposed evaluations. Android got the second place in the Screen factors. In the others, Windows Phone was second and Android was third. A small variation in the weights did not change the order of classification found. Although ranking should reflect the decision makers preference, further investigations can be carried out using the TOPSIS method and its relationship to mobile devices interface.

20-37

Authors: LINDO, O. D.

A method for estimating the intangible value (INTVAL) impact of Information and Communication Technologies (ICTs) investments in organizations is presented. The method proposes conducting a comparative analysis of the impact projected by decision makers (DMs) with that perceived by user beneficiaries of the level of contribution of such technologies to the value-generating activities of their business unit. This will allow decision makers to determine: a) how an ICT investment is expected to impact their business unit’s value chain, b) how an ICT investment actually impacted their business unit’s value chain, and c) whether the INTVAL impact obtained with an ICT investment is aligned with the business’ strategic goals in terms of how many value-generating activities intended to be impacted were actually impacted at the predicted extent. A hypothetical example case is presented to illustrate the implementation of the method proposed.

46-74

Authors: ALOISE, A.F., FERREIRA, J.L.C., BARBOSA, J.L.V.

This paper proposes an educational recommendation system model based on prediction of students flunking in e-learning courses. RECD is proposed, a model of Educational Recommendation Systems which receives from some prediction system, among them MD-PREAD, statistical data on the possibility of learners' failure in a discipline and, based on these data, recommends to the target audience to reduce the number of apprentices who can fail. Techniques such as classification of user profiles, context awareness and Custom-er Relationship Manager were used to provide learners an opportunity not to fail in a discipline, or to improve the coeffi-cient of performance, to reduce the time enrolled in the course and to accelerate the certification Through pedagogical inter-ventions A prototype was designed to be experimented at the Federal Institute of Education, Science and Technology of Amazonas, in the program Open University of Brazil, in the Philosophy of Education course, in discipline of Brazilian Sign Language, in the second semester of 2015. We collected 30 teachers profiles, allowing the classification of the teacher profile using decision tree with RapidMiner. The prototype was also presented to 12 teachers so that they could make an evaluation of perceived ease of use and utility perception through the Technology Acceptance Model. It was concluded that RECD is a computational tool that can help teachers and course coordinators to rescue apprentices before the failure to culminate, in the discipline in progress.

2-15

Authors: LINDO, O. D.

Investments in Information and Communication Technologies (ICTs) can provide firms with both tangible and intangible benefits (IBs). However, these investments are generally analyzed and evaluated by means of traditional methods, which focus on the measurement of the tangible to determine, mainly, the amount of profit that has been obtained. In this paper we develop the foundation of a methodological guide with focus on the estimation of IBs. For this, we present evidence that suggests that an analysis of the impact of ICT investments by focusing on the estimation of IBs may be based on the value chain of a business unit; we also provide a list of factors of intangible value of ICTs identified in the literature reviewed and propose stages to fulfill and variables to use so as to contribute for a comprehensive evaluation of said investments.

34-41

Authors: GARCIA, C. M.; ABÍLIO, R.

In companies environments, it is normal to exist several systems to ease daily activities. In academic environments, it also happens. However, academic environments may be even more heterogeneous as there are many specialized activities, such as: restaurant, library, academic processes, administrative processes and computer network services, such as email and network authentication. To maintain the data consistency throughout the systems, all the systems must be integrated. This integration was carried out in the Federal University of Lavras by using Simples Object Access Protocol (SOAP) as communication protocol. The development of a new system (mobile application), it was noticed that SOAP is very CPU-intensive and slow, as mobile devices have constraints such as internet and processing. Thus, a REST-JSON layer to integrate mobile application and the integration architecture was developed, benefiting from all the resources the integration architecture had. By using this new layer, the offer of functions from the integration architecture was also expanded to REST, attending to other applications without having to make big changes in the code. It was measured that the REST-JSON layer consumes around 73% less data than SOAP. The REST-JSON layer was released, attending to about 5600 installations of the application that requests the integration around 54000 times a day.

53-61

Authors: WATANABE, H. H. M., CIRINO, R. B. Z., SOLER, W. A. O., SANTOS, M. O.

This paper addresses the Production Routing Problem (PRP). In this problem we make integrated decisions about the number of products to be manufactured, the number of products to be delivered to each customer and the routes of the vehicles used to deliver the manufactured products. The integrated problem attempts to minimize both production and distribution costs, over all periods of a finite planning horizon. An Integer Programming Model is presented and model-based heuristics are proposed to tackle the PRP. Computational results are shown for both benchmark and proposed instances, in order to compare the proposed solution method with a high-performance commercial solver. The results show that our approach outperforms the commercial solver in getting high-quality solutions in instances with more than 10 customers and 5 products.