Laszlo Hajdu

InnoRenew CoE · ICT

Brands can be defined as psychological constructs residing in our minds. By analyzing brand associations, we can study the mental constructs around them. In this paper, we study brands as parts of an associative network based on a word association database. We explore the communities–closely-knit groups in the mind–around brand names in this struct...

Indoor Air Quality monitoring is a major asset to improving quality of life and building management. Today, the evolution of embedded technologies allows the implementation of such monitoring on the edge of the network. However, several concerns need to be addressed related to data security and privacy, routing and sink placement optimization, prot...

A matematikai értelemben vett gráfok vagy hálózatok sokoldalú, szemléletes modellezési eszközt biztosítanak más tudományterületek számára, többek között az orvos­tudomány számára is. Ebben a közleményben a fertőző betegségekkel kapcsolatos hálózati modelleket ismertetjük röviden. Az ismert, a tudományterület szakirodalmában meglévő eszközökön felül...

Both community detection and influence maximization are well-researched fields of network science. Here, we investigate how several popular community detection algorithms can be used as part of a heuristic approach to influence maximization. The heuristic is based on the community value, a node-based metric defined on the outputs of overlapping com...

The mental lexicon stores words and information about words. The lexicon is seen by many researchers as a network, where lexical units are nodes and the different links between the units are connections. Based on the analysis of a word association network, in this article we show that different kinds of associative connections exist in the mental l...

Because of the wide variety of possible application fields and the spread of smart devices, the research of wireless sensor networks has become an increasingly important area in the last decade. During the design of these networks, several important aspects have to be considered, for example the lifetime of the network, expected battery usage, or r...

Background: Mental wellbeing of employees is crucial for successful organizations. Psychosocial interventions that target highly contagious individuals (i.e., individuals that can ‘transmit’ their wellbeing to others) could efficiently improve overall wellbeing in the workplace. Objectives: Using the magnitudes of effects observed in existing studi...

In the last years personnel cost became a huge factor in the financial management of many companies and institutions.The firms are obligated to employ their workers in accordance with the law prescribing labour rules. The companies can save costs with minimizing the differences between the real and the expected worktimes. Crew rostering is assignin...

A new methodology in temporal networks is presented for the use of fraud detection systems in the banking sector. Standard approaches of fraudulence monitoring mainly have the focus on the individual client data. Our approach will concentrate on the hidden data produced by the network of the transaction database. The methodology is based on a cycle...

As more and more cities adopt the use of smart cards as means to access public transportation networks, it becomes much easier to discover the mobility patterns of individual passengers. A natural way to represent such patters is in the form of graphs. In this paper we analyze the public transportation network of a major metropolitan area from a un...

Abstract—Community detection is a widely discussed topicin network science which allows us to discover detailed in-formation about the connections between members of a givengroup. Communities play a critical role in the spreading ofviruses or the diffusion of information. In [1], [8] Kempe et al.proposed the Independent Cascade Model, defining a si...