Ignacio Javier Pérez

University of Granada | UGR · Department of Computer Science and Artificial Intelligence

Large-Scale Group Decision-Making, propelled by the advent of Large Language Models and the imperative for assertiveness in decision-making processes, emerges as a pivotal area of research. This paper navigates through the landscape of Large-Scale Group Decision-Making, delineating its significance across diverse domains, including social networks...

When addressing a decision making problem with incomplete preference relations, missing information could be estimated by proposing an optimization model. The previous studies always focus on a unique solution to optimization models through a software program. But theoretical and simulation investigations of multiple solutions are seldom considered...

Group decision-making, an everyday practice ranging from simple choices to long-term investments, is influenced by the inherent ambiguity of the natural language we use as people. The ambiguity in this instance stands in stark contrast to the precision of language employed by machines. Furthermore, expressing emotions, such as aggressiveness or hap...

Group Decision-Making is a process in which experts have to choose one or more options from a finite set of alternatives. Group Decision-Making methods were developed to assist in this type of event, but often information is lost in the alternatives analysis since not all the alternatives fulfil criteria in the same way. Moreover, in these methods,...

Group decision-making is an event in which a group of experts have to decide between a limited set of alternatives. To share their opinions and ideas, this group of experts conducts a debate where they compare the alternatives with each other. Nevertheless, once the debate is over, the experts must provide their assessments by using reciprocal pref...

The science of science practice requires the analysis of large and complex bibliometric data. Traditional data exporting from companies' websites is not sufficient, so APIs are used to access a larger corpus. Therefore, this study aims not only to establish a taxonomy but also to offer a comparative analysis of 44 bibliographic APIs from various no...

Nowadays there are a great amount of data that can be used to train artificial intelligent systems for classification, or prediction purposes. Although there are tons of publicly available data, there are also very valuable data that is private, and therefore, it can not be shared without breaking the data protections laws. For example, hospital da...

Most of the group decision making methods used in e-government scenarios deal not only with a high number of alternatives, but also a large number of criteria. Sometimes, criteria are even the most important think to manage. In such a way, we propose the use of fuzzy ontologies in order to tackle this problem, dealing with a high number of alternat...

Group Decision-Making is a process by which a set of experts sort a set of alternatives. When there are a large number of experts, the process is called a Large-Scale Group Decision-Making process. In this kind of environment, there is a great variety of attitudes when discussing the set of alternatives. For instance, there may be experts who may b...

Achieving a good agreement level between decision-makers is a crucial point to solve group decision-making processes. Habitually, it is the duty of the moderator, a person in charge of assuring that the consensus reaching process is conducted correctly. This person also offers advice to the decision-makers with the objective that they modify their...

Because a decision-making process in the real world involves more people and it is more heterogeneous nowadays, this paper develops an innovative large scale multi-granular decision-making method that is intended to be used in situations where many experts are involved, who do not have to provide their opinions about the alternatives at the same ti...

Most of the available Multi-criteria Group Decision Making methods that deal with a high number of elements usually focus on managing scenarios that have high number of alternatives and/or experts. Nevertheless, there are also cases in which the number of criteria values is difficult for the experts to tackle. In this paper, a novel Group Decision...

Pairwise comparison between alternatives is the preference elicitation method most used in decision making. To model it, a mathematical model based on the concept of preference relation has been proposed. When preference relations are used, consistency, which is commonly related to the concept of transitivity, is a fundamental concern needing atten...

Nowadays, wine has become a very popular item to purchase. There are a lot of brands and a lot of different types of wines that have different prices and characteristics. Since there is a lot of options, it is easy for buyers to feel lost among the high number of possibilities. Therefore, there is a need for computational tools that help buyers to...

Videogames are a very interesting area of research for fields as diverse as computer science, health, psychology or even social sciences. Every year a growing number of articles are published in different topics inside this field, so it is very convenient to study the different bibliometric data in order to consolidate the research efforts. Thus, t...

Group decision making is an important task in real world activities. It consists in obtaining the best solution to a particular problem according to the opinions given by a set of decision makers. In such a situation, an important issue is the level of consensus achieved among the decision makers before making a decision. For this reason, different...

Body balance disorders are related to different injuries that contribute to a wide range of healthcare issues. The social and financial cost of these conditions is really important. Therefore, the quickly and reliably body balance assessment contribute to the prevention and ensure a better clinical intervention. Moreover, the use of smartphone appl...

A Group decision making process is carried out when human beings jointly make an election from a possible collection of alternatives. Here, a question of importance is to avoid winners and losers, in the sense that the choice is not any more attributable to any single individual, but all group members contribute to the decision. For this reason, th...

Consensus in group decision making requires discussion and deliberation between the group members with the aim to reach a decision that reflects the opinions of every group member in order for it to be acceptable by everyone. Traditionally, the consensus reaching problem is theoretically modelled as a multi stage negotiation process, i.e. an iterat...

One of the main challenges that the appearance of Web 2.0 and the overall spreading of the Internet have generated is how to tackle with the high number of users and information available. This problem is also inherited by the group decision making problems that can be carried out over the Web. In this article, to solve this issue, a group decision...

The main aim of this contribution is to develop a co-words analysis of the Fuzzy Decision Making research area in the last ten years (2007–2016). The software tool SciMAT is employed using an approach that allows us to uncover the main research themes and analyze them according to their performance measures (qualitative and quantitative). Using an...

Group Decision Making methods are interesting tools that can be used for extracting subjective information from experts that are familiar with an specific topic. Although they are typically used for carrying out an alternatives ranking, a novel approach that can extract information from the experts and store it in a fuzzy ontology is presented in t...

A group decision making situation involves multiple decision makers communicating with others to reach a decision. In such a situation, the most important issue is to obtain a decision that is best acceptable by the decision makers, and, therefore, consensus has attained a great attention and it is a major goal of group decision making situations....

Group decision making situations are part of today's organizations. It is a type of decision making involving many decision makers which act collectively to choose the best alternative (or alternatives) from a set of feasible alternatives. Usually, numerical values have been used by the decision makers to express their opinions on the possible alte...

The appearance of Web 2.0 and mobile technologies, the increase of users participating on the Internet and the high amount of available information have created the necessity of designing tools capable of making the most out of this environment. In this paper, the design of an Android application that is capable of aiding some experts in carrying o...

In group decision making problems, when a consensual solution is required, a natural question is how to measure the closeness among experts’ opinions in order to obtain the consensus level. To do so, different approaches have been proposed. Following this research line, several authors have introduced hard consensus measures varying between 0 (no c...

Internet has experienced a deep change. Now, people can communicate among themselves and share information and experiences thanks to Web 2.0 technologies. One way of storing all these information in a sorted way implies the use of Fuzzy Ontologies. In this paper, a novel and automatic method that is capable of retrieving and storing information com...

Nowadays, the human-computer interaction is being a hot topic. In such a way, several methods have been proposed to deal with multi-granularity when people with different knowledge level express their preferences on the same concept using linguistic notation, that is, words instead of numbers. This is a critical problem in group decision making sce...

Academic digital libraries are getting more benefit from the Web possibilities to help with teaching, learning and research activities. Because of it, more and more people use the services that they offer. Therefore, it is very important that the academic digital libraries provide a good service in order to satisfy the users’ expectations. The aim...

The multi-granular fuzzy linguistic modeling allows the use of several linguistic term sets in fuzzy linguistic modeling. This is quite useful when the problem involves several people with different knowledge levels since they could describe each item with different precision and they could need more than one linguistic term set. Multi-granular fuz...

Nowadays, smartphones have become indispensable items for everybody. Thanks to them, people can communicate and access Internet at any time regardless of where they are located. New smartphones belonging to a high amount of labels and with different features and prices keep appearing constantly in the market. This way, there is a need of tools that...

licenses/by-nc-nd/3.0/). Selection and peer-review under responsibility of the Organizing Committee of ITQM 2014. Abstract Libraries are recently changing their classical role of providing stored information into new virtual communities, which involve large number of users sharing real time information. Despite of those good features, there is stil...

Nowadays, smartphones have become indispensable items for everybody. Thanks to them, people can communicate and access Internet at any time regardless of where they are located. New smartphones be-longing to a high amount of labels and with different features and prices keep appearing constantly in the market. This way, there is a need of tools tha...

Libraries represent a focal point of academic life and as such serve also a societal purpose of bringing together people around common themes. This purpose is nowadays enhanced and facilitated by the so-called digital libraries. For this reason, it is necessary to develop tools for helping users to reach decision with a high level of conensus in th...

In the literature, we find that the consensus models proposed for group decision making problems are guided by consensus degrees and/or similarity measures and/or consistency measures . When we work in heterogeneous group decision making frameworks, we have importance degrees associated with the experts by expressing their different knowledge level...

Involving many people in decision making does not guarantee success. In practice, there are always individuals who try to exert pressure in order to persuade others who could easily be influenced. In these situations, classical group decision making models fail. Thus, there is still the necessity of developing tools to help users reach collective d...

The improvement of the quality of the services is one of the primary sources of competitive advantage in health care organizations. As customers typically search for higher quality of care when choosing treatments, health plans and providers, the health care organizations strive to improve the quality of care and patient safety and satisfaction, as...

The main purpose of a Group Decision Making model is to reach a consensual solution as quickly as possible by decreasing the gap between the perceptions of different decision makers. The perception of the decision makers depends on the various relations between alternatives and attributes. As a real life example, one can mention the present problem...

Web 2.0 communities are a quite recent phenomenon which involve large numbers of users and where communication between members is carried out in real time. Despite of those good characteristics, there is still a necessity of developing tools to help users to reach decisions with a high level of consensus in those new virtual environments. In this c...

LibQUAL+ model is a web-based survey to measure the library service quality according to the users' perceptions. Although it is the most popular method, it presents two major drawbacks: (i) it is devised on cardinal scale to measure the library service quality (from 1 to 9), but, due to the subjectivity, impression and vagueness of the human beings...

The aim of this paper is to present a new mobile group decision making model to deal with heteroge-neous information and changeable decision contexts. This model takes into account that experts have different backgrounds and knowledge levels, allowing to use different preference representations as fuzzy preference relations or linguistic preference...

Heterogeneity in group decision making problems has been recently studied in the literature. Some instances of these studies include the use of heterogeneous preference representation structures, heterogeneous preference representation domains and heterogeneous importance degrees. On this last heterogeneity level, the importance degrees are associa...

The aim of this contribution is to present a prototype of decision support system based on mobile technologies and dynamic information. Users can run the system on their own mobile devices in order to provide their preferences at anytime and anywhere. The system provides consensual and selection support to deal with dynamic decision making situatio...

The aim of this paper is to present a new model of decision support system for group decision making problems based on a linguistic approach and dynamic sets of alternatives. The model incorporates a mechanism that allows to manage dynamic decision situations in which some information about the problem is not constant in time. We assume that the se...

In Group Decision Making (GDM) the automatic consensus models are guided by different consensus measures which usually are obtained by aggregating similarities observed among experts’ opinions. Most GDM problems based on linguistic approaches use symmetrically and uniformly distributed linguistic term sets to express experts’ opinions.However, ther...

The aim of this paper is to present a decision support system model with two important characteristic: 1) mobile technologies are applied in the decision process and 2) the set of alternatives is not fixed over time to address dynamic decision situations in which the set of solution alternatives could change throughout the decision-making process....

In this contribution, we present a new application based on fuzzy linguistic information to evaluate the quality of digital libraries. The quality evaluation of digital libraries is defined using users' perceptions on the quality of digital services provided through their Web sites. We assume a fuzzy linguistic modeling to represent the users' perc...

The aim of this paper is to present a new group decision making model with two important characteristics: i) we apply mobile technologies in the decision process and ii) the set of alternatives is not constant through time. We implement a prototype of a mobile decision support system based on changeable sets of alternatives. Using their mobile devi...

Se analiza la calidad de las bibliotecas universitarias biomédicas de España de acuerdo con lo que opinan, valoran y desean sus usuarios estudiantes. Sus opiniones se han recogido mediante la herramienta de evaluación de calidad de bibliotecas basada en satisfacción de usuarios LibQUAL+.

Two processes are necessary to solve group decision making problems: a consensus process and a selection process. The consensus process is necessary to obtain a final solution with a certain level of agreement between the experts, while the selection process is necessary to obtain such a final solution. Clearly, it is preferable that the set of exp...

To solve group decision-making problems we have to take in account different aspects. On the one hand, depending on the problem, we can deal with different types of information. In this way, most group deci- sion-making problems based on linguistic approaches use symmetrically and uniformly distributed lin- guistic term sets to express experts' opi...

In group decision making situations, there may be cases in which experts do not have an in-depth knowledge of the problem to be solved and, as a result, they may present incomplete information. In this paper, we present a new selection process to deal with incomplete fuzzy linguistic information. As part of it, we use an iterative procedure to esti...

With the recent spreading of social networks and digital communities, the Web has a new business model for providing free content-sharing services. Using the power of the masses and the collective intelligence, Web 2.0 sites have created enormous e-commerce opportunities for marketing and advertising. Thus, there is still a necessity of developing...

Usually, in a group decision context, the importance level, confidence degree and amount of knowledge are very different among individuals. So, when all the individuals have to reach agreement, is quite important to model these kind of features in order to get more appropriate decisions. Last related works are focussed in the selection process to m...

In this work, we present a model based on linguistic information to evaluate the quality of digital libraries. The quality evaluation of digital libraries is defined using users' perceptions on the quality of digital services provided through its Web site. The concept of quality of digital libraries is characterized by means of subjective quality i...

Web 2 0 technologies provide rich and lightweight online tools that let users contribute with new data. They can associate in social networks, share ideas and information and collaborate together for many kind of reasons, obtaining a community's "collective intelligence". We propose to compute this collective Intelligence with a Mobile Decision Sup...