Ojaras Purvinis's research while affiliated with Kaunas University of Technology and other places

Publications (24)

Article
Full-text available
A successful shopping experience without overcrowded shops and long waiting times undoubtedly leads to the release of happiness hormones and is generally considered as the goal of any optimization. Factors influencing the shopping experience can be divided into internal and external ones. External factors are related e. g. to the arrival of the cus...
Conference Paper
Full-text available
A successful shopping experience without overcrowded shops and long waiting times undoubtedly leads to the release of happiness hormones and is generally considered as the goal of any optimization. Factors influencing the shopping experience can be divided into internal and external ones. External factors are related e. g. to the arrival of the cus...
Article
Full-text available
Similarity between two fuzzy values, sets, etc., may be defined in various ways. The authors here attempt introducing a general similarity measure based on the direct extension of the Boolean minimal form of equivalence operation. It is further extended to hierarchically structured multicomponent fuzzy signatures. Two versions of this measure, one...
Conference Paper
Full-text available
A challenging task for energy-efficient and sustainable network operation is the load-adaptive operation of network elements such as routers, switches and access multiplexers. Since the traffic is temporally fluctuating, load-adaptive control of the network requires a robust traffic demand estimation. The aim is to develop a simulation model for dy...
Article
Full-text available
Globalization and its challenges for organizations led to the understanding that employees can be a critical factor contributing to the organization’s performance. Therefore, various studies sought to understand employee’s behaviour that in itself encompasses various forms of engagement. One of the constructs defining engagement is citizenship beha...
Conference Paper
Full-text available
Time in the Queue to the Cash Register, Payment Processing Time at the Cash Register. Abstract: The optimization of supermarket processes as well as the increase in productivity and profitability of shop sales requires extensive knowledge of bottlenecks within the sales processes as bottlenecks limit the capacity of shop sales. Bottlenecks refer to...
Conference Paper
Full-text available
The optimization of bursty business processes requires stochastic models with measurable parameters. Often simplifications worked out in the analysis of such models lead to inaccuracies when events occur in a bursty manner. In this work, a novel approach based on generating functions is introduced for modelling the bursty appearance of buyers via g...
Article
Full-text available
The evaluation of data obtained from responses given to questionnaires in humanities and social sciences, such as management, linguistics, etc. is a complex task with the necessity of dealing with the inherent subjectivity and vagueness in such data. In this paper, a method based on fuzzy signatures (FSigs), suitable for analyzing questionnaires wi...
Chapter
A set of answers to questions to employees of various companies in Lithuania may refer to various positive and negative aspects of the attitudes of employees. These are called Organizational Citizenship Behavior (positive) and Counterproductive Work Behavior (negative). The components in the answers may be grouped by expert knowledge, and by statis...
Conference Paper
Full-text available
Nowadays, bursty business processes are part of our everyday life. Bursty business processes include such processes as selling and buying, too. One of the contemporary challenges business environment has to deal with is monitoring and controlling of burstiness in business processes. Monitoring and controlling of burstiness in business processes oft...
Article
To interpret and to process the answers to questionnaires with large amount of questions may be not easy task. They are multidimensional data, sometimes with high dimensionality (in the hundreds). Therefore, it is necessary that some data reduction approach should be employed. On the other hand, answers to specific questions in questionnaires are i...
Conference Paper
Full-text available
Simulation models allow predicting the development of real situations in various technical, business and social systems. However, many real situations in business environment are of bursty nature. Buyers often appear concentrated or, in other words, bursty. Different approaches for analysing buyers' behaviour have been developed. One of these appro...
Book
Burstiness Management for Smart, Sustainable and Inclusive Growth: Emerging Research and Opportunities provides innovative insights into burstiness’s role in decision-making in business and its function as a predictor of performance. The content within this publication covers topics such as burstiness in business and e-business applications, as wel...
Conference Paper
Full-text available
Optimization of e-business process allows increasing earning profits in e-business. Models based on gap processes for the analysis of buyers’ burstiness in e-business process have attracted an increased research interest in order to succeed in the optimization of e-business process. The research aim is to find model approaches for creating gap stru...
Article
Full-text available
Abstract. Background: Education for health society attracts more and more research efforts as it facilitates the quality of society’s life. However, research on education for health society is of bursty nature. The phenomenon of burstiness is of particular research interest as it influences the flow of a number of processes including research and t...
Conference Paper
Full-text available
Europe including Latvia is facing enormous socio-economic and unprecedented demographic challenges in the context of volatility, uncertainty, complexity and ambiguity. In the light of these challenges, higher education in rural areas is struggling to adopt the best approach, pursuing efficiency in the organisation of the study process. Therein, opt...
Article
Full-text available
Background: Education for health society attracts more and more research efforts as it facilitates the quality of society's life. However, research on education for health society is of bursty nature. The phenomenon of burstiness is of particular research interest as it influences the flow of a number of processes including research and the quality...
Conference Paper
Full-text available
Earning profits in business requires analysis of binary customer behaviour. The aim of the research is to carry out mathematical analysis of gap processes underpinning elaboration of a simulation model of binary customer behaviour in a bursty business process. The meaning of such key concepts as bursty business process, binary customer behaviour an...
Conference Paper
Full-text available
As students are the key participants in higher education, analysis of binary students’ behaviour contributes to the organisation of a qualitative study process significant to provide students with a high quality degree within higher education. The aim of the research is to carry out mathematical analysis of gap processes underpinning elaboration of...
Conference Paper
Full-text available
The success of business related processes requires analysis of binary customer behaviour among others. For the evaluation of business related processes realistic models are an important prerequisite. The research question is as follows: How can binary customer behavior in a business related process be modeled? In situations where binary decisions a...
Conference Paper
Full-text available
Criteria such as price, installation time, etc [6] for quantitative decisions in multi-criteria decision making have attracted a lot of research efforts. Against this background, criteria for qualitative decisions such as yes, no, etc [29] as a result of the multi-criteria decision making are still under-developed. The aim of the paper is to analys...
Article
Full-text available
The paper deals with the stakeholder management especially giving focus on the organization's and stakeholder relationships issues. The purpose of the paper is to construct a new methodological approach by developing fuzzy logic model based on experts’ knowledge for conceptual insights on possible solutions for measuring stakeholders’ influence. Th...

Citations

... To reduce the PKI and certificate dependencies, the notion of identity-based signature (IBS) was first introduced by Shamir [1] in 1984, in which the public key of a user is simplified as his identity (e.g., name, email address, or phone number). This opens the way to more flexible and efficient digital signature schemes [2][3][4][5][6][7]. ...
... Another aspect is that STEM often requires interdisciplinary knowledge, thereby adopting the methodology of interdisciplinary studies (Ahrens, Purvinis, Zaščerinska, & Andreeva, 2016). ...
... The data were collected in different grocery shops and it is expected that other check out stations work in a similar way as they work with similar equipment. Thereby it was not differentiated between different kinds of payment (e. g. cash, credit card or via mobile apps) [10]. ...
... Analysis of the external and internal factors that influence the bottleneck in shop sales [1] has led to the identification of phases in the buying process in shop sales [1]. The buying process was based on the customer-server key interactions: buyers' (in other words, customers') waiting time in the queue to the cash register (in other words, server) and the payment processing time at the cash register. ...
... Thus, an interesting and consistent subset of the descriptors represented by the replies in both countries could be identified. The idea of model set-up based on FSigs incorporating the responses was already published by the authors [9]. To avoid repetition of the argumentation in the cited paper, here, the methodology of constructing the corresponding FSigs is straightforwardly applied. ...
... Modelling of the customer-server interaction has attracted a lot of research activities [2]. In [3] and [1] the service process consisting of the waiting in the queue to the cash register and the scanning of the goods as well as the payment process have been analysed and parameters for measuring burstiness within the check-out process have been derived. Joint modelling of these two processes by using generation functions is given in [4]. ...
... In the analysis of the results, based on studies on the characteristics of the traditional family, a structured hierarchical model is used to describe the key factors and related constructs of the traditional family schema under one umbrella, and, by employing a simplified version of the Fuzzy Signature Model (Kóczy et al., 2019), the model is used to investigate the link between marital names and the participants' degree of conformity to the Hungarian traditional family schema. The basic tenet of the research is that while single-component analyses of the survey questions provide merely partial results of the linkage between name structures and the traditional family schema, bringing various components of the schema under one umbrella reveals a strong connection between the two domains. ...
... In this case, the model has to be extended by at least a second parameter as shown by Wilhelm (Wilhelm 1976;Wilhelm, 2018) and Ahrens (Ahrens, Purvinis and Zaščerinska, 2019) by introducing buyer concentration (1 − α). As shown in (Wilhelm 1976;Wilhelm, 2018;Ahrens et al, 2019;Ahrens, Purvinis and Zaščerinska, 2019), a good gap distribution function for bursty as well as non-bursty buyers' behaviour is given by ...
... Burstiness is used to support decision making through designation of a tendency in a field of scientific investigation [21] as pointed in Figure 8 [6]. Fig. 8. ...
... The research data are interpreted by the researcher(s) who is involved in the research implementation. This means "the researcher is the interpreter" (Ahrens, Purvinis, Zascerinska, Miceviciene, & Tautkus, 2018). ...