Konstantinos KIRYTOPOULOS | National Technical University of Athens (original) (raw)

Uploads

Papers by Konstantinos KIRYTOPOULOS

Lecture Notes in Mechanical Engineering, 2016

Nowadays, in customer/supplier relationship, suppliers have to define and evaluate some offers ba... more Nowadays, in customer/supplier relationship, suppliers have to define and evaluate some offers based on customers' requirements and company's skills. This offer definition implies more and more some design activities for both technical solution and its delivery process. In the context of Engineering-To-Order, design and engineering activities are more important, the uncertainties on offer characteristics is rather high and therefore, suppliers bid on the calls for tender depending on their feelings. In order to provide suppliers with metrics that enable him/her to know about the confidence level of an offer, we propose a knowledgebased model that includes four original metrics to characterize the confidence level of an offer. The offer overall confidence relies on four indicators: (i) two objectives ones based on Technology Readiness Level and Activity Risk Level, and (ii) two subjective ones based on the supplier's skills and risks aversion. The knowledge-based model for offer definition, offer assessment and offer confidences is based on a constraint satisfaction problem.

Proceedings of the 31st European Safety and Reliability Conference (ESREL 2021)

Journal of Financial Management of Property and Construction

Purpose Despite the fact that extensive studies on public-private partnerships have focused on ri... more Purpose Despite the fact that extensive studies on public-private partnerships have focused on risk identification and classification, research still lacks concentration on studying the latent structure of risks in build operate transfer (BOT) transportation projects, especially in developing countries. The research was carried out in Vietnam and this paper aims to explore the underlying relationships among risks in the context of BOT transportation projects. Design/methodology/approach A questionnaire survey was conducted to investigate the perception of stakeholders regarding the probability of occurrence and the severity of the impact of risks related to BOT transportation projects. Factor analysis was performed based on a total of 40 risks. Findings Seven risk groups were formed as a result of factor analysis, namely, “projects’ viability and political-regulatory risks”, “macroeconomic risks”, “projects’ feasibility study and market risks”, “financial risks”, “organization/coord...

Tunnelling and Underground Space Technology

With a view to enhance the safety of the road transport system, it is crucial to focus primarily ... more With a view to enhance the safety of the road transport system, it is crucial to focus primarily on its key elements, one of which is tunnels. The significance of tunnels is based on an endogenous problem, which is the severity of accidents that may occur. Several studies and aftermaths from disastrous accidents have shown that correct users' behaviour may smooth the adverse outcomes of a potential accident. Therefore, information campaigns are requested to be conducted. Before designing such a campaign, it is vital to have explored users' current state of knowledge on the issue. This paper presents an internetmediated questionnaire survey conducted in Greece aiming to explore road tunnel users' awareness and to identify potential knowledge gaps that should be managed for the upcoming information campaigns. The results revealed that users have several misconceptions concerning the recommended behaviour both in normal and critical situations. Taking into account that users consist in the cornerstone of tunnel safety parameters, it is important to note that even a little improvement on their performance may greatly benefit the overall safety of the system. Hence, aspects highlighted in this paper could be taken into consideration by the upcoming information campaigns on the issue.

Proceedings of the 20th International Symposium on Advancement of Construction Management and Real Estate, 2016

The engineering and construction companies working in the oil and gas industry treat lessons lear... more The engineering and construction companies working in the oil and gas industry treat lessons learnt as secrets of the trade. Therefore, they rarely publish relevant registers for professional or educational purposes. Aim of this research is the investigation of current issues in oil and gas industry through capitalising on experience coming from practitioners (lessons learnt). The research tool comprises a semi-structured questionnaire that was built around the project management subject groups as these are described in the ISO21500 standard: Guidance on Project Management as well as the PMBOK. Nine Australian oil and gas project managers with experience ranging from 10 to 20 years, were interviewed, and their personal experiences were investigated through cluster analysis. Relevant ideas among interviewees were grouped together forming captured lessons learnt that are presented under four overarching themes, namely (a) Integration and Quality, (b) Human Resources, Communications and Stakeholders, (c) Risk and (d) Procurement, Scope, Time and Cost. In conclusion, this empirical research presents a particular insight to the Australian oil and gas construction projects and extends the limited repository of scholar publications for lessons learnt from this particular industry.

2015 International Conference on Industrial Engineering and Systems Management (IESM), 2015

Project complexity has been extensively explored in the literature because of its major contribut... more Project complexity has been extensively explored in the literature because of its major contribution towards the failure of major projects in terms of cost and time overruns. Researchers have identified important factors that contribute to the project complexity and validated their findings through case studies. Few studies have even focused on developing tools for evaluating the project complexity. However, existing research has not explored an important aspect of linking project complexity to different types of project and supply chain risks. We propose a framework for establishing risk paths across project complexity elements, project and supply chain risks, and resulting consequences. Project complexity elements are the knowns at the commencement stage of a project whereas project and supply chain risks are the uncertainties that might realize within the life cycle of the project. We demonstrate application of our proposed framework through a simple simulation example using Bayesian Belief Network. The method can be an important contribution to the literature and beneficial to the practitioners in terms of introducing a new perspective of investigating causal paths of interacting project complexity elements and risks.

Project Management Journal

Researchers have not studied the human side of project managers thoroughly. Decision-making mecha... more Researchers have not studied the human side of project managers thoroughly. Decision-making mechanisms lie not only in technocratic knowledge but also in practitioners’ inner cultures and personal lifestyles. Highlighting the human (f)actor behind the strategic decisions made in projects reveals a new path for analyzing project managers. This article applies Bourdieu’s practice theory within the field of project management through a qualitative study into 17 successful and experienced Greek project managers. The results exhibit the common social characteristics of successful project managers and suggest that project managers must be viewed from a sociological perspective as well.

Supply chain risk management (SCRM) has recently gained interest both from the practitioners and ... more Supply chain risk management (SCRM) has recently gained interest both from the practitioners and the researchers due to the increased request for efficiency and the diminishing margins for deviations. Organizations aim to achieve their goals for varying levels and types of supply-chain risks. Identifying and dealing with supply chain risks involves a great amount of subjectivity and uncertainty. Analytical examination of the risks related to a specific supply chain is a tedious task due to the lack of available data. This difficulty is accentuated when there are significant variations of the environmental parameters and/or the amount of available information is not sufficient. The proposed approach aims at providing a method for qualitative risk analysis after the risk identification. The risk identification utilizes the withstanding knowledge related to each echelon of the specific supply chain and to the supply chain as a whole. This data is used to form the risk break down structure that is the main input of the proposed approach. The Analytical Network Process is used for the risk analysis following a multi-criteria approach. The process is applied on the lower RBS level. The risks composing the specific level define the set of alternatives to be ranked. A number of criteria defined by the group of decision makers (supply chain managers and risk analysts) are used for comparing the alternative solutions. The ranking, results on the definition of priorities, for taking mitigation actions. Having in mind that the risk identification and the criteria definition are done once per supply chain and updated when needed, we get a quick way for analyzing supply chains risks. However, as it is expected the more knowledge we get about the specifics of the under question supply chain the higher accuracy has the proposed approach.

Journal of Risk Analysis and Crisis Response

International Journal of Construction Management

Engineering, Construction and Architectural Management

PurposeThe Built Operate Transfer (BOT) model has been increasingly used in transportation invest... more PurposeThe Built Operate Transfer (BOT) model has been increasingly used in transportation investments in Vietnam. However, there is still an inadequacy of risk management applications in these projects and lack of research in this area. The study aims to improve the success of projects implemented through the BOT model in Vietnam.Design/methodology/approachThe study followed a sequential design including interviews and a questionnaire survey to investigate the perception of stakeholders from public and private sector regarding the probability of occurrence and the severity of impact of risks in BOT transportation projects in Vietnam. Quantitative data from the survey was subjected to descriptive and inferential statistics to explore the priority of risks as well as the differences in the perception between the public and private sectors.FindingsThe results showed that the top five most significant risks in BOT transportation projects in Vietnam are: (1) problems with land acquisiti...

International Journal of Critical Infrastructures

Tunnelling and Underground Space Technology

Engineering, Construction and Architectural Management

Purpose The purpose of this paper is to systematically develop a delay risk terminology and taxon... more Purpose The purpose of this paper is to systematically develop a delay risk terminology and taxonomy. This research also explores two external and internal dimensions of the taxonomy to determine how much the taxonomy as a whole or combinations of its elements are generalisable. Design/methodology/approach Using mixed methods research, this systematic literature review incorporated data from 46 articles to establish delay risk terminology and taxonomy. Qualitative data of the top 10 delay risks identified in each article were coded based on the grounded theory and constant comparative analysis using a three-stage coding approach. Word frequency analysis and cross-tabulation were used to develop the terminology and taxonomy. Association rules within the taxonomy were also explored to define risk paths and to unmask associations among the risks. Findings In total, 26 delay risks were identified and grouped into ten categories to form the risk breakdown structure. The universal delay r...

Journal of Traffic and Transportation Engineering (English Edition)

International Journal of Project Management, 2016

Project complexity has been extensively explored in the literature because of its contribution to... more Project complexity has been extensively explored in the literature because of its contribution towards the failure of major projects in terms of cost and time overruns. Focusing on the interface of Project Complexity and Interdependency Modelling of Project Risks, we propose a new process that aids capturing interdependency between project complexity, complexity induced risks and project objectives. The proposed modelling approach is grounded in the theoretical framework of Expected Utility Theory and Bayesian Belief Networks. We consider the decision problem of identifying critical risks and selecting optimal risk mitigation strategies at the commencement stage of a project, taking into account the utility function of the decision maker with regard to the importance of project objectives and holistic interaction between project complexity and risk. The proposed process is supported by empirical research that was conducted in the construction industry in order to explore the current practices of managing project complexity and the associated risks. The experts interviewed acknowledged the contribution of the proposed process to the understanding of complex dynamics between project complexity attributes and risks.

International Journal of Procurement Management, Mar 20, 2015

... Biographical notes: Dimitra Voulgaridou obtained her PhD in Multicriteria Decision Analysis f... more ... Biographical notes: Dimitra Voulgaridou obtained her PhD in Multicriteria Decision Analysis from the National Technical University of Athens (2008) and an ... The main goals include increasing the market share, stepping up the pace of employee exchange, shortening the time for ...

Lecture Notes in Mechanical Engineering, 2016

Proceedings of the 31st European Safety and Reliability Conference (ESREL 2021)

Journal of Financial Management of Property and Construction

Tunnelling and Underground Space Technology

Proceedings of the 20th International Symposium on Advancement of Construction Management and Real Estate, 2016

2015 International Conference on Industrial Engineering and Systems Management (IESM), 2015

Project Management Journal

Journal of Risk Analysis and Crisis Response

International Journal of Construction Management

Engineering, Construction and Architectural Management

International Journal of Critical Infrastructures

Tunnelling and Underground Space Technology

Engineering, Construction and Architectural Management

Journal of Traffic and Transportation Engineering (English Edition)

International Journal of Project Management, 2016

International Journal of Procurement Management, Mar 20, 2015

Exploring aspects of how innovative methods can truly attain a sustainable society is necessary f... more Exploring aspects of how innovative methods can truly attain a sustainable society is necessary for the future of our planet. This study focuses on serious games, and how users can increase their understanding of sustainability issues and their familiarity with sustainable development strategies. “Users” of serious games consist of all possible target groups that are interested in attaining knowledge of sustainability through the use of games that are designed for a purpose beyond entertainment, in this case for sustainability education. This paper follows the systematic literature review method to deliver a study of serious games featuring sustainable development practices and policies. In order to provide a thorough analysis of their dynamic features, 77 games were explored in this study. The findings show the growing number of serious games that seek to educate in sustainability and the categorization of these games according to the triple-bottom line of sustainability, giving clarification hints to users wishing to select the relevant tool that offers an understanding of specific sustainability issues. The purpose of such research is to reveal the contribution of serious games as effective tools in facilitating sustainability education and to group them according to their nature and direction in relation to sustainability. Limitations in their effectiveness are also identified and a research agenda for new, relevant serious games is proposed that will enhance holistic knowledge and make it easier to clarify their pedagogical basis. The recipients of the findings will be all those future users and trainers who are interested in accessing sustainability education patterns through the use of serious games. This study will enable them to select the serious game that best serves their needs.

Sustainable development and sustainability assessment is one of the most important challenges of ... more Sustainable development and sustainability assessment is one of the most important challenges of our time. On the other hand, game -based learning (GBL) is proven to increase soft skills, such as critical thinking, creative problem solving and teamwork, as well as to improve cognitive development, learning retention and social learning, which are of vital meaning for future sustainable aware researchers and professionals. Additionally, the literature review indicates that there is a complete lack of studies in integrating social and environmental sustainability into serious games. The purposeof the study is to integrate sustainability issues into educational project management using an existing serious game as educational tool and thus to create a new sustainable informed basis for serious games in master’s degree engineering courses. The proposed scenario indicates that the focus is on both the deliverable/product of the project, such as the project specifications, requirements, deliverable, quality criteria and materials used as well as the delivery/process of the project, such as management planning and project sequencing. Through a case study all the game characteristics that can evolve in order to include sustainability concepts are presented.