Repositório IC-Online

Institution's Scientific Repository

IC-Online, the Institutional Repository of Scientific Information of the Polytechnic of Leiria (IPLeiria), is part of the RCAAP Project (Open Access Scientific Repositories of Portugal). Its main objectives are to organise, preserve and disseminate the scientific production of the Polytechnic of Leiria (IPLeiria), helping to increase the visibility and impact of the institution's scientific publications.

The IC-Online Repository includes various types of digital documents, such as articles from national and international scientific journals, papers from congresses and conferences, master's dissertations and doctoral theses, among others.

Política Institucional de Acesso Livre do Politécnico de Leiria (Despacho nº 124/2018)
Regras de afiliação do Politécnico de Leiria (Despacho nº 228/2020)
Normas de atribuição de identificadores DOI, ISBN e DL (Despacho nº 257/2024)
Apoio à investigação

Email repositorio@ipleiria.pt

Recent Submissions

Ontology-supported database marketing

Publication . Pinto, Filipe Mota; Marques, Alzira; Santos, Manuel Filipe; Mota Pinto, Filipe; Marques, Alzira

Database marketing (DBM) provides in -depth analysis of marketing databases. Knowledge discovery in database techniques is one of the most prominent approaches to supporting some of the DBM process phases. However, in many cases, the benefits of these tools are not fully exploited by marketers. Complexity and amount of data constitute two major factors limiting the application of knowledge discovery techniques in marketing activities. Currently, ontologies may here play an important role in the marketing discipline. Motivated by its success in the area of artificial intelligence, we propose an ontology-supported DBM approach. The approach aims to enhance DBM with ontology by providing detailed step-phase specific information. Our research work has its foundations in a double methodological approach using the Delphi and Action Research methodologies. First, we use Delphi to structure related DBM knowledge, and then we align our work to the Action Research methodology in order to systematise the knowledge extraction process and knowledge base creation. The issues raised in this paper both respond and contribute to calls for a DBM process improvement. Our work was evaluated in the relationship marketing domain focusing on a relational marketing programme database. The findings of this study not only advance the state of DBM research, but also shed light on future research directions.

2009-06Journal article

Open access

Visual Fixations in Basketball Shooting: Differences between Shooting Conditions

Publication . Amaro, Catarina M.; Castro, Maria António; Mendes, Rui; Gomes, Beatriz B.

Basketball is a sport where shooting is one of the most important factors that determines the success or failure of the teams. Therefore, basketball players need to shoot the ball accurately. The present study aimed to evaluate whether different shooting conditions influence the visual behavior of athletes. For this, the Tobbi Pro Glasses 3 equipment was used to evaluate the time of the first fixation, the number of fixations, and the total time of fixations in the basket, during the shooting movement. Different distances to the basket, simulated gym audience noise, and shooting with opposition were considered. A group of 18 athletes with an average age of 22 ± 3.72 years and an average basketball practice experience of 12.5 ± 4.52 years performed 10 valid shots from different distances and different shooting angles, with different restrictions, namely, shooting with simulated opposition and gym audience noise. Statistically significant differences between shooting with opposition and baseline, in terms of the number of fixations and the total time of fixation, were found. Regarding shooting with gym audience noise, differences only occur for the total time of fixations in one position. Despite this, in all variables and positions, the values were lower in shooting with constraints compared to the baseline.

2024-04-09Journal article

Open access

Integration of Resource Poor Wireless Sensor Networks into Smart Spaces

Publication . Costa, Nuno; Pereira, António; Serôdio, Carlos

Wireless Sensor networks (WSNs) have been referred to as one part of the background infrastructure required to achieve ubiquitous computing, where smart spaces are included. For instance, WSNs could be especially useful to compute the user context or even 'context' of mobile resources in general. To serve this purpose, wireless sensor network must expose some sort of service discovery and usage capability and be compatible with the nowadays ubiquitous technologies. In this paper we present a practical approach to bring WSNs, specially the ones built from resource poor sensor nodes, to participate into smart environments as ubiquitous devices. The approach addresses device heterogeneity, uses the state of the art and ubiquitous TCP/IP communication stack, is service driven and do not rely in any external resource rich device. As a result, we successfully created a Java based service discovery and usage protocol that is compliant with ad-hoc networks and resource constrained devices and a framework capable of produce the source and binary code ready to run on both resource constrained sensor nodes and PCs.

2009-12Conference paper

Restricted access

Effect of stocking density and different diets on growth of Percula Clownfish, Amphiprion percula (Lacepede, 1802)

Publication . Chambel, João; Severiano, Vera; Baptista, Teresa; MENDES, SUSANA; Pedrosa, Rui

The aim of this study was to evaluate the influence of stocking density (0.5, 1, 2 and 3 fishL−1) and commercial marine fish diets (diet A, B, C and D) over four months on specific growth rate, condition factor, percentage without anomalous pigmentation (partial or total lack of white bands -miss-band) and survival of juvenile Amphiprion percula. Results showed that at 0.5 fishL−1 densities induced the best survival (100%) and also the maximum percentage of fish without miss-band (58.33 +/−4.417%). The maximum SGR was obtained for the 0.5 fishL−1 (0.459 ± 0.023% cm/day). However, the best condition factor (2.53 +/− 0.27) was achieved for 2 fishL−1 densities. There were no significant differences in survival (68.9 to 84.5%), fish without miss-bands (18.03 to 26.92%) and condition factor (1.92 to 2.1) among diets during the experimental period. On the other hand, diet C (with 41% crude protein) supported the best SGR (0.485 ± 0.001% cmday−1). The results suggested that stocking density are critical and more relevant when compared with the different diet tested, namely on specific growth rate, condition factor, the miss-band and survival of juvenile percula clownfish. This study has particular significance with regards to anemonefishes husbandry in terms of survival and production efficiency.

2015-04-16Journal article

Open access

On the formability, geometrical accuracy, and surface quality of sheet metal parts produced by SPIF

Publication . Alves, Maria; Silva, M. B.; Alves, L. M.; Martins, P. A. F.; Xiaoyuan He; Huimin Xie; YiLan Kang

Conventional sheet metal forming processes are not suitable for flexible small-batch production and, therefore, are not appropriate for the growing agile manufacturing trends requiring very short life-cycles, development and production lead times. In fact, the present need for flexible sheet metal forming techniques requires the development of innovative technological solutions that are capable of reducing the fixed and capital costs of sheet metal forming to a level where small-batch production becomes economically feasible. Single point incremental forming (SPIF) is a new sheet metal forming process with a high potential economic payoff for rapid prototyping applications and for small quantity production. In general terms a typical SPIF set-up makes use of a small number of low cost active tools components; (i) a blankholder, (ii) a backing plate and (iii) a single point forming tool. The tool path is generated in a CNC machining center and during the process there is no backup die supporting the back surface of the sheet. Despite the contributions of many researchers on the development of industrial applications and better characterization of the forming limits of the process, several key topics related to the mechanics of deformation, likely mode of failure, geometric accuracy and surface quality of the formed parts remain little understood and scarcely systematized. This paper attempts to provide new contributions about the abovementioned issues by means of a comprehensive experimental investigation performed under laboratory controlled conditions.

2009-08Conference paper

Open access