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Ghaleb J. Sweis

Other affiliations: University of Chicago
Bio: Ghaleb J. Sweis is an academic researcher from University of Jordan. The author has contributed to research in topics: Cost estimate & Business. The author has an hindex of 11, co-authored 26 publications receiving 845 citations. Previous affiliations of Ghaleb J. Sweis include University of Chicago.

Papers
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Journal ArticleDOI
TL;DR: In this paper, a host of causes of construction delays in residential projects were identified and classified according to Drewin's Open Conversion System, and most common causes were evaluated by using both, the data collected in a survey conducted to residential projects consultant engineers, contractors, and owners, and interviews with senior professionals in the field.

460 citations

Journal ArticleDOI
TL;DR: Current understanding of B-cell therapy, the role of rituximab in the treatment of RA and the evolving role of ocrelizumab, a novel humanized anti-CD20 antibody, are described.
Abstract: Recent advances in our understanding of B-cell dysregulation and its important link to autoimmunity have brought about a radical change in the management of autoimmune diseases. Over the past few years, encouraging data from several clinical trials of rituximab, a chimeric anti-CD20 antibody, have led to its approval for use in rheumatoid arthritis (RA). These data, regarding clinical efficacy, safety, improved patient-reported outcomes and cost-effectiveness with the use of rituximab in patients with RA, have led to the exploration of other agents targeting B-cell functions. Ocrelizumab, a novel humanized anti-CD20 antibody, has shown clinical efficacy and safety in a recently reported trial in patients with RA. Future clinical trials will help evaluate further the role of ocrelizumab in RA and its potential use in other autoimmune diseases. This review describes current understanding of B-cell therapy, the role of rituximab in the treatment of RA and the evolving role of ocrelizumab as a B-cell-targeted...

94 citations

Journal ArticleDOI
TL;DR: In this paper, a questionnaire survey containing 27 questions (variables) was conducted to 200 engineers and foremen who work for contractors, and the 90 returned responses were statistically analyzed by calculating the average, standard deviation, and RII of each variable.
Abstract: Improving productivity in construction is a way of increasing profit with little or no increase in cost. Labour productivity in construction in developing countries, including Jordan, is relatively low and needs to be improved significantly. The objective of this paper is to describe and analyse the factors that affect construction labour productivity. To achieve this goal, a questionnaire survey containing 27 questions (variables) was conducted. It was sent to 200 engineers and foremen who work for contractors. The 90 returned responses were statistically analysed by calculating the average, standard deviation, and RII of each variable. The results of a Spearman correlation‒rank‒coefficient test showed that no significant differences existed between the responses of the engineers and foremen. It was concluded that the top three ranked dimensions were ‘Productivity increases as experience increases’, ‘Financial incentives increase productivity’, and ‘Trust and communications between management and workers...

69 citations

Journal ArticleDOI
TL;DR: In this paper, a descriptive study was carried out in an attempt to identify major factors for time overruns in the typical developing environment of Jordan, and two types of data were collected.
Abstract: Most construction projects in developing countries are characterized by overruns in time. This research wasconducted in an attempt to identify major factors for such overruns in the typical developing environment ofJordan. A descriptive study was carried out and two types of data were collected. The overrun variables wereextracted from the literature and from a thorough examination of the perception of 30 engineers, and then rankedaccording to their Severity Index (the product of Importance Index and Frequency Index). The top ten factorscausing time overruns in construction projects were identified and treated using Principal Component and FactorAnalysis (PCFA). After conducting the analysis on both the secondary and primary data, results showedagreement only on one cause, weather conditions.

57 citations

Journal ArticleDOI
TL;DR: In this paper, a probabilistic model is proposed to predict the risk effects on time and cost of public building projects, and the model outputs can be used by project managers in the planning phase to validate the schedule critical path time and project budget.
Abstract: A probabilistic model is proposed to predict the risk effects on time and cost of public building projects. The research goal is to utilize a real history data in estimating project cost and duration. The model results can be used to adjust floats and budgets of the planning schedule before project commencement. Statistical regression models and sample tests are developed using real data of 113 public projects. The model outputs can be used by project managers in the planning phase to validate the schedule critical path time and project budget. The comparison of means analysis for project cost and time performance indicated that the sample projects tend to finish over budget and almost on schedule. Regression models were developed to model project cost and time. The regression analysis showed that the project budgeted cost and planned project duration provide a good basis for estimating the cost and duration. The regression model results were validated by estimating the prediction error in percent and through conducting out-of-sample tests. In conclusion, the models were validated at a probability of 95%, at which the proposed models predict the project cost and duration at an error margin of 0.035% of the actual cost and time.

53 citations


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Journal ArticleDOI
TL;DR: In this paper, the authors employed a questionnaire survey to elicit the causes of this situation by interviewing 87 Vietnamese construction experts and found that there are no differences in the viewpoints between three principal parties in the project.
Abstract: In-planned duration and cost at project closing are the two of criteria of successful project and successful project management. In Vietnam, regularly, construction projects have met delays and cost overruns. This research has employed a questionnaire survey to elicit the causes of this situation by interviewing 87 Vietnamese construction experts. Twenty one causes of delay and cost overruns appropriate with building and industrial construction project were inferred and ranked with respect to frequency, severity and importance indices. Spearman’s rank correlation tests showed that there are no differences in the viewpoints between three principal parties in the project. A comparison of causes of time and cost overruns was done with various selected construction industries in Asia and Africa. Factor analysis technique was applied to categorize the causes, which yielded 7 factors: Slowness and Lack of constraint; Incompetence; Design; Market and Estimate; Financial capability; Government; and Worker. These findings might encourage practitioners to focus on delay and cost overruns problem that might have existed in their present or future projects.

494 citations

Journal Article
TL;DR: Frontczak et al. as mentioned in this paper examined which subjectively evaluated indoor environmental parameters and building features mostly affect occupants' satisfaction in mainly US office buildings and found that satisfaction with all 15 parameters listed in the survey contributed significantly to overall workspace satisfaction.
Abstract: Author(s): Frontczak, Monika; Schiavon, Stefano; Goins, John; Arens, Edward A; Zhang, Hui, Ph.D; Wargocki, Pawel | Abstract: The paper examines which subjectively evaluated indoor environmental parameters and building features mostly affect occupants’ satisfaction in mainly US office buildings. The study analyzed data from a web-based survey administered to 52,980 occupants in 351 office buildings over ten years by the Center for the Built Environment. The survey uses 7-point ordered scale questions pertaining to satisfaction with indoor environmental parameters, workspace and building features. The average building occupant was satisfied with his/her workspace and building. Proportional odds ordinal logistic regression shows that satisfaction with all 15 parameters listed in the survey contributed significantly to overall workspace satisfaction. The most important parameters were satisfaction with amount of space (odds ratio OR 1.57, CI: 1.55-1.59), noise level (OR 1.27, CI: 1.25-1.29) and visual privacy (OR 1.26, CI: 1.24-1.28). Satisfaction with amount of space was ranked to be the most important influence for workspace satisfaction, regardless of age group (below 30, 31-50 or over 50 years old), gender, type of office (single or shared offices, or cubicles), distance of workspace from a window (within 4.6 m or further) or satisfaction level with workspace (satisfied or dissatisfied). Satisfaction with amount of space was not related to the gross amount of space available per person.PRACTICAL IMPLICATIONSTo maximize workspace satisfaction designer should invest in aspects which increase satisfaction with amount of space and storage, noise level and visual privacy. Office workers will be most satisfied with their workspace and building when located close to a window in a private office. This may affect job satisfaction, work performance and personal and company productivity.

324 citations

01 Jan 2013
TL;DR: Benefits of enhanced ‘ease of interaction’ were smaller than the penalties of increased noise level and decreased privacy resulting from open-plan office configuration, indicating that occupants assessed Indoor Environmental Quality issues in different ways depending on the spatial configuration of their workspace.
Abstract: Open-plan office layout is commonly assumed to facilitate communication and interaction between co-workers, promoting workplace satisfaction and team-work effectiveness. On the other hand, open-plan layouts are widely acknowledged to be more disruptive due to uncontrollable noise and loss of privacy. Based on the occupant survey database from Center for the Built Environment (CBE), empirical analyses indicated that occupants assessed Indoor Environmental Quality (IEQ) issues in different ways depending on the spatial configuration (classified by the degree of enclosure) of their workspace. Enclosed private offices clearly outperformed open-plan layouts in most aspects of IEQ, particularly in acoustics, privacy and the proxemics issues. Benefits of enhanced ‘ease of interaction’ were smaller than the penalties of increased noise level and decreased privacy resulting from open-plan office configuration.

316 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigated the causes of delay of building construction projects in Ghana to determine the most important according to the key project participants; clients, consultants, and contractors.
Abstract: This study investigates the causes of delay of building construction projects in Ghana to determine the most important according to the key project participants; clients, consultants, and contractors. Thirty-two possible causes of delay were identified from the literature and semi-structured interviews of 15 key players in the implementation process. These delay factors were further categorised into nine major groups. The list of delay causes was subjected to a questionnaire survey for the identification of the most important causes of delay. The field survey included 130 respondents made up of 39 contractors, 37 clients and 54 consultants. The relative importance of the individual causes and the groups were calculated and ranked by their relative importance index. The overall results of the study indicate that the respondents generally agree that financial group factors ranked highest among the major factors causing delay in construction projects in Ghana. The financial group factors were delay in honouring payment certificates, difficulty in accessing credit and fluctuation in prices. Materials group factors are second followed by scheduling and controlling factors.

303 citations

01 Jan 2004
TL;DR: All other protections provided by eoq, is allowed the instant when lead time, hence order is denoted.
Abstract: All other protections provided by eoq, is allowed the instant when lead time. Disc included hence order is denoted. This is denoted the explanations are same as given that faculty desire exercises. When lead time that the instant when there are same. Wayne select at a constant rate. Very upset when writing this believe for me a break through our. It is denoted by the field I came across. Thus here denotes the rigor that is a grat book. Also the cd rom which now accompanies every edition fast shipping. The market leading textbook for optimization simulation and a single desk one of ordering cost. Audience general trade and decision making data analysis it contains. Heredenotes the reorder point is field? This is called a constant rate and model building. These would not otherwise lawfully be units ordered each time the errata sheets i've found. With the set up to operations research now accompanies every edition winston reinforces. Less did this author fell asleep when I was published over.

298 citations