Master Degree / Yüksek Lisans Tezleri

Permanent URI for this collectionhttps://hdl.handle.net/11147/3008

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Author: search.filters.author.Kale, SerdarPublisher: search.filters.publisher.Izmir Institute of Technology

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Now showing 1 - 6 of 6
  • Master Thesis
    A Grey Verhulst Model for forecasting construction costs
    (Izmir Institute of Technology, 2020) Erinç, Uğurkan; Kale, Serdar
    Forecasting costs in construction projects has an important place in whole processes. It is very important to observe possible changes in the construction process, especially in large scale projects. Using a series of data in a functional way can be useful to make the changes that can be made at a later time in that field. Grey models have an important place in the time series forecasting model. In line with this case, there are a number of methods developed over time. In fact, when these models are examined, it is seen that they follow and complement each other in the developmental stages, but the levels of development differ with some important decompositions. The ability to model and forecast construction costs can result in more accurate cost forecasting and budgeting. This has been modeled using a residual Fourier model by analyzing the remains of the Grey Verhulst Model, conditional variability of construction cost prices. The results show that the developed model can forecast construction costs with less errors. It was observed that the deviation rate in the final values decreased up to 0.97%. The data used in the time series analysis were observed for a relatively long time. These data are calculated with the assumption that the system will be developed in the future and the forecasted values will be maintained in the future based on these time series data.
  • Master Thesis
    A Critical Analysis of Project Cost Estimation Models in Construction Management Literature
    (Izmir Institute of Technology, 2020) Özkan, Selen; Kale, Serdar
    Studies in recent years have shown that the majority of published studies cannot be reproduced. Failure to reproduce the researchs lead to a crisis in the reliability of the study results. The importance and benefits of reproducible research results have been well understood in a number academic fields such as psychology and biomedicine and in turn several steps have been taken to ensure the adequate data sharing in order to reproduce the studies. . The thesis presented herein explores the concept of reproducibility in the context of construction management literature in particular construction cost estimation research. A sample of 227 articles published in project management and construction management journals was analyzed. The research findings reveal that only 3.69% of articles can be reproduced and reproducibility is a major issue in construction management literature. The primary reasons those the reproducibility of the studies difficult include missing data, presentation method, inability to read the graphics and tables, incomplete reporting and explanation errors. It appears that the reliability crisis which has widely acknowledge in a number research fields is also major in the construction management literature.
  • Master Thesis
    A Bibliometric Analysis of Critical Construction Management Studies
    (Izmir Institute of Technology, 2019) Deniz, Berna Derya; Kale, Serdar
    Copernicus's revolution is a philosophical change that questions the existence of humanity in the universe, as opposed to the belief; he claims that the Sun is the center of the universe, not the Earth. Rather than questioning a different perspective, believing in a dogmatic knowledge is a simple way to escape. Critical Management Studies (CMS), like Copernicus's revolution, has an ambitious goal on management theory and practice. CMS offers a number of alternatives to the current system by expressing more than critical thinking. It focuses on the impacts of management on the traditional labor force and production factors and it focuses on organizing the differences between theory and practice. The aim of the research presented in this thesis is to explore the evolution of CMS and its diffusion in project management studies and construction management studies. Bibliometric analysis is chosen as the research method, in the citation networks that emerged using the VOSviewer program, 11 most cited articles from the 283 center documents underlie the basis of the study. In the study, the citation relations of the articles are examined in terms of author, document, country, and keyword. The results of the research indicate that (1) CMS is still in the process of embryotic stage of its development, (2) the diffusion of CMS in project management studies and construction management literature have been limited and (3) the calls for pluralistic approach in construction management studies have not been addressed in literature.
  • Master Thesis
    Corporate Social Responsibility in the Construction Industry
    (Izmir Institute of Technology, 2019) Doğan, Ceren; Kale, Serdar
    The concept of “Corporate Social Responsibility” is one of the most discussed and debated issues in literature. It argues that firms should behave responsibly to the environment, society, and all stakeholders. Construction firms have been relatively slow, compared to firms operating in other industries, in adopting “Corporate Social Responsibility (CSR)” practices. Yet it is a topical managerial issue for construction firms. The main objective of the research present in this thesis is to explore the concept of Corporate Social Responsibility practices in the context of construction industry. The sample used in this thesis is composed of 205 construction firms listed in ENR‟s 2018 Top 250 International Contractors. CSR discourses of construction firms are explored by using content analysis of CSR reports, financial reports, corporate web pages and other web sources. The research findings suggest that CSR practices/discourses used in the construction industry can be categorized into nine major groups. The most common CSR practices/discourses used in construction industry focuses on customer issues, environmental issues and labour issues. Research results also highlight that nationality of the firms, continent in which construction firms located and the ranking of construction firms in ENR list have significant impact on the use of CSR practices/discourse.
  • Master Thesis
    A Cash Flow at Risk (cfar) Model for Managing Payment Delays in Construction Projects
    (Izmir Institute of Technology, 2019) Demirkapı, Hande Betül; Kale, Serdar
    Cash flow management is a vital process for the efficient and effective management of operations and activities in construction firms. Researchers have been involved in developing the cash flow management models for the use of construction firms. The research presented in this thesis address this vital process - cash flow management in construction firms. It proposes a two-step a stochastic cash flow simulation model to manage interim and final payment delays in construction projects. The first step of the proposed model is pattern identification process - identifying the payment patterns of the owner. The second step is financial risk evaluation process based on Cash flow at Risk (CaFR). Three construction projects are used to illustrate the implementation and utility of the proposed stochastic cash flow model. The results of the proposed stochastic simulation model suggest that payment delays in construction projects is common and payment delays not only increase the operating capital requirements of construction firms but also bring significant financial burden to the construction firms. The proposed model enables construction business executives/practitioner to evaluate the financial risks due to the payment delays.
  • Master Thesis
    Process Capability Analysis (pca) of Tender Evaluation Process in Public Agencies
    (Izmir Institute of Technology, 2019) Keskin, Pınar; Kale, Serdar
    Public is the largest client in many countries. Public agencies acquire good, service and constructed facilities through the procurement. Most of the public procurements are completed later than the estimated times or even canceled due to the various reasons. Public procurement processes can be improved by using statistical or non-statistical process improvement methods. A review of the construction management literature reveals that process improvement methods are commonly focused on construction operations. Various process improvements have been proposed to improve effectiveness and efficiency of construction operations. Yet improving the tender evaluation process of construction projects is an unexplored research area in the construction management literature. The objective of this study is to analyze the tender evaluation process of public agencies and measure and in turn evaluate the adequacy of this process by using the process improvement methods. The study presented in thesis is based on two process improvement methodologies: (1) Define-Measure-Analyze- Improve-Control (DMAIC) and Process Capability Analysis (PCA). Public procurement processes performed by public agencies (i.e., state universities) are investigated. Tender evaluation processes of public agencies are studied based on criteria: (1) number of participants and (2) estimated construction cost. The research findings reveals that (1) the most time-consuming stage in the tendering process is the tender evaluation stage, (2) the tenders having higher estimated construction cost and more participants have longer tender duration and (3) the process capabilities of public agencies based on number of tenderers and estimated construction cost appear to be poor. The poor capability indices of public agencies suggest that immediate managerial actions should be taken to improve tender evaluation process in public agencies.