Papers by Wafik Lotfallah
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This paper introduces a new Ehrenfeucht-Fra¨ osse type game that is played on two classes of mode... more This paper introduces a new Ehrenfeucht-Fra¨ osse type game that is played on two classes of models rather than just two models. This game extends and generalizes the known Ajtai-Fagin game to the case when there are several alternating (coloring) moves played in different models. The game allows Duplicator to delay her choices of the models till (practically) the very end of the game, making it easier for her to win. This adds on the toolkit of winning strategies for Duplicator in Ehrenfeucht-Fra¨ osse type games and opens up new methods for tackling some open problems in descriptive complexity theory. As an application of the class game, it is shown that, if m is a power of a prime, then first order logic augmented with function quantifiers F 1 of arity 1 and height n<m can not express that the size of the model is divisible by m. This, together with some new expressibility results for Henkin quantifiers H 1 gives some new separation results on the class of finite models among ...
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Construction Research Congress 2022, 2022
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Construction, one of the most informationintensive industries, plays a vital role in the prosperi... more Construction, one of the most informationintensive industries, plays a vital role in the prosperity of nations and is expected to grow to new heights. This significant expansion, along with the increased complexity and sophistication of construction projects and rapid advances in emerging technologies, has fueled construction companies’ interest in innovation as a source of competitive advantage. Augmented Reality (AR), a pillar of Industry 4.0, is an emerging technology that is gaining traction in construction. AR can be described as both an information aggregator and a data publishing platform that allows the user to (1) passively view displayed information, (2) actively engage and interact with published content, and (3) collaborate with others in real-time from remote locations. The objective of this paper is to develop an Augmented Reality Fitness Index (ARFI) to assess the suitability and applicability of AR for contractors in the construction industry. The rationale behind th...
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Frontiers in Built Environment
Information is the lifeblood of modern construction. Advances in Information and Communication Te... more Information is the lifeblood of modern construction. Advances in Information and Communication Technology have been and are continuing to progress at rapid rates. Construction companies that are successfully able to adopt and integrate new technologies will gain a competitive edge. One emerging technology that has great potential to transform the construction industry is Augmented Reality (AR). While AR has been of interest to researchers for some time, no single research effort has yet comprehensively investigated the opportunities, benefits, challenges, and future paths toward implementing AR in modern construction. The main objective of this research is to investigate the potential of AR throughout the lifecycle of a construction project from the perspective of the construction industry. Responses from 93 industry practitioners were collected to investigate use-cases of AR throughout the project lifecycle, highlight potential benefits, and identify obstacles to entry that have sl...
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Construction Research Congress 2022, 2022
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Journal of Logic and Computation, 2011
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Journal of Construction Engineering and Management
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Engineering, Construction and Architectural Management
Purpose Healthcare-sector projects are some of the most complex in modern practice due to their r... more Purpose Healthcare-sector projects are some of the most complex in modern practice due to their reliance on high-tech components and the level of precision they must maintain. Existing literature in healthcare performance specifically is scarce, but there is a recent increasing trend in both healthcare construction and a corresponding trend in related literature. No previously existing study has derived weights (relative importance) of performance metric in an objective, data-based manner. The purpose of this paper is to present a newly developed mathematical model that derives these weights, free of subjectivity that is common in other literature. Design/methodology/approach This paper’s model considers 17 exceptional projects and 19 average projects, and reveals the weights (or relative importance) of ten performance metrics by comparing how projects relate to one another in terms of each metric individually. It solves an eigenvalue problem that maximizes the difference between av...
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Construction Management and Economics
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Canadian Journal of Civil Engineering
Competent project managers (PMs) are the backbone of any construction project. It is extremely im... more Competent project managers (PMs) are the backbone of any construction project. It is extremely important to constantly develop and enhance their competencies. However, to establish effective training and development plans for PMs, the relative importance of the key competencies that define a PM’s performance should be first understood. Instead of subjectively weighting the relative importance of differing competencies, this paper aims at developing an automated model that uses real-life data to compute the PM competency weights. The rationale behind the model is to maximize the distance in a higher dimensional space between average and exceptional PM performances. The model solves an eigenvalue problem, and identifies a single data-based weight for each competency. The model is generic and can be applied to various research settings to alleviate the problems associated with opinion-based assessment and reduce individuals’ subjectivity. Findings within this paper reveal the most crit...
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Journal of Construction Engineering and Management, 2016
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Automation in Construction, 1999
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MSC (2000) 03B70, 03C52, 03C80, 03C85, 03C13, 68Q15, 68Q17, 68Q19 This paper introduces a new Ehr... more MSC (2000) 03B70, 03C52, 03C80, 03C85, 03C13, 68Q15, 68Q17, 68Q19 This paper introduces a new Ehrenfeucht-Fra¨ õsse type game that is played on two classes of models rather than just two models. This game extends and generalizes the known Ajtai-Fagin game to the case when there are several alternating (coloring) moves played in different models. The game allows Duplicator to
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Journal of Symbolic Logic, 2000
We introduce a new framework for asymptotic probabilities of sentences, in which we have a $\sigm... more We introduce a new framework for asymptotic probabilities of sentences, in which we have a $\sigma$-additive measure on the sample space of all sequences $A = \{\mathscr{A}_n\}$ of finite models, where the universe of $\mathscr{A}_n$ is $\{$1,2 ... n$\}$, and use this framework to strengthen 0-1 laws for logics.
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Journal of Construction Engineering and Management, 2014
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Computing in Civil Engineering (2012), 2012
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Papers by Wafik Lotfallah