scholarly journals Sustainable Allocation Model of Construction Workforce for Work Resumption during COVID-19

2021 ◽  
Vol 13 (11) ◽  
pp. 6481
Author(s):  
Layin Wang ◽  
Dong Zhao ◽  
Yanqi Zhong
Keyword(s):  
Energy Levels ◽  
Similarity Function ◽  
Skilled Workers ◽  
Allocation Model ◽  
Construction Companies ◽  
Workforce Allocation ◽  
Basic Characteristics ◽  
Allocation Decisions ◽  
Work Resumption

COVID-19 has posed challenges for the construction industry, such as precise pandemic control, sustainable labor relations, and loss minimization. In response to these challenges, this study has developed a decision model that optimizes workforce allocation for projects to achieve sustainable workforce management, a tradeoff between pandemic prevention and work resumption. The priority of project resumption was evaluated using basic characteristics, the long- and short-term strategies, and the regional pandemic situation. The energy level of skilled workers was graded according to construction team size, skill level, and experience. Sustainable allocation principles and paths were explored to target four different types of work resumption plans. We used the cellular automaton (CA) technique to simulate the sustainable allocation model. We also analyzed the similarity function of energy levels and the time-cost function of allocation. The case study of the SGJ Construction demonstrates that this allocation model can accurately simulate work resumption and provide a sustainable allocation decisions and tools under pandemic. Also, it implies balanced interests and concerns between construction companies and the society for work resumption during COVID-19.

Design of water allocation model: efficiency and risk aspects

2005 ◽  
Vol 5 (3-4) ◽  
pp. 9-16
Author(s):  
C. Kim ◽  
D. Han
Keyword(s):  
Water Allocation ◽  
Primary Objective ◽  
Allocation Model ◽  
Proportional Allocation ◽  
Model Efficiency ◽  
Service Sectors ◽  
Expected Benefits ◽  
Water Allocation Model ◽  
Allocation Methods

The primary objective of this study is to improve the methodology for water allocation focused on efficiency and risk aspects. To attain the primary objective, this study sets up an objective function to maximize social expected benefits, and considers three types of allocation methods. Three types of allocation methods are optimal, proportional, and fixed allocation between regions and service sectors. The results of case study area shows that the fixed allocation method is preferred to the proportional allocation in most cases except that the variance of flow is small with respect to efficiency. Also, efficient and less-risky allocation is simultaneously obtained in some cases, while efficiency and risk show the relation of trade-off in other cases.

scholarly journals A stochastic programming approach for Shelter location and evacuation planning

2018 ◽  
Vol 52 (3) ◽  
pp. 779-805 ◽  
Author(s):  
Vedat Bayram ◽  
Hande Yaman
Keyword(s):  
Stochastic Programming ◽  
Shortest Paths ◽  
Evacuation Planning ◽  
Programming Approach ◽  
Mean Values ◽  
The Road ◽  
Traffic Allocation ◽  
Evacuation Plan ◽  
Allocation Decisions

Shelter location and traffic allocation decisions are critical for an efficient evacuation plan. In this study, we propose a scenario-based two-stage stochastic evacuation planning model that optimally locates shelter sites and that assigns evacuees to nearest shelters and to shortest paths within a tolerance degree to minimize the expected total evacuation time. Our model considers the uncertainty in the evacuation demand and the disruption in the road network and shelter sites. We present a case study for a potential earthquake in Istanbul. We compare the performance of the stochastic programming solutions to solutions based on single scenarios and mean values.

CASE STUDY OF THE CONVERGENCY OF NONLINEAR PERTURBATION SERIES: MORSE–FESHBACH NONLINEAR SERIES

1999 ◽  
Vol 14 (13) ◽  
pp. 2103-2115 ◽  
Author(s):  
BISWANATH RATH
Keyword(s):  
New York ◽  
Energy Levels ◽  
Perturbation Series ◽  
Nonlinear Perturbation ◽  
Theoretical Physics ◽  
The Matrix ◽  
Diagonalization Method ◽  
Matrix Diagonalization ◽  
Divergent Behavior

We study the divergent behavior of the Morse–Feshbach nonlinear perturbation series (MFNS) [P. M. Morse and H. Feshbach, Methods of Theoretical Physics, Part II (McGraw-Hill, New York, 1953)] for producing convergent energy levels using the ground state of a quartic anharmonic oscillator (AHO) in the strong coupling limit. Numerical calculations have been done up to tenth order. Further comparison of the MFNS convergent result has been made with the matrix diagonalization method.

scholarly journals Application of BIM and 3D Laser Scanning for Quantity Management in Construction Projects

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Thu Anh Nguyen ◽  
Phong Thanh Nguyen ◽  
Sy Tien Do
Keyword(s):  
Construction Industry ◽  
Construction Projects ◽  
Laser Scanning ◽  
Essential Role ◽  
Industrial Revolution ◽  
Management Process ◽  
3D Laser Scanning ◽  
Economic Sectors ◽  
Construction Companies

The construction industry has played an essential role in the process of modernization and industrialization and it has also been a major factor in determining the development of the infrastructure for other economic sectors. Construction companies consider the measurement of work progress, which often wastes time and has a low resolution, to be one of the most challenging problems faced by project management. Therefore, this research aimed to propose practical solutions by applying recent technological achievements of the 4.0 industrial revolution to improve the efficiency of the quantity management process. By utilizing the advantages and features of a BIM model and 3D laser scanning, this paper proposes that adopting a BIM model and 3D laser scanning has the potential to improve the accuracy and efficiency of the quantity management process. The case study demonstrated some typical tasks to evaluate accuracy and efficiency as well as to showcase the research proposal.

scholarly journals STUDY, DESIGN AND SIMULATION OF A PROGRAM FOR NUMERICAL EVALUATION OF VEHICLES’ FUEL CONSUMPTION DUE TO DRAG FORCE; CASE OF LIGHT VEHICLES.

2020 ◽  
Vol 7 (1) ◽  
pp. 1-11
Author(s):  
Mbelle Samuel Bisong ◽  
Paune Felix ◽  
Lokoue D. Romaric Brandon ◽  
Pierre Kisito Talla
Keyword(s):  
Mathematical Model ◽  
Computer Program ◽  
Fuel Consumption ◽  
Drag Force ◽  
Numerical Evaluation ◽  
Construction Companies ◽  
Mathematical Relation ◽  
Basic Equations ◽  
Valid Information

Nowadays, vehicles are being abandoned by their users due to their high fuel consumption which had not been studied by the user from the start. Thus, the need to study the fuel consumption of vehicles due to one of the factors which greatly affects it; drag force, so as to produce information which vehicle users can have before purchasing their vehicles. With regards to this, this work is focused on the development of a computer program able to evaluate the fuel consumption of light vehicles. To achieve this, the basic equations of consumption are used to arrive at a mathematical relation between drag force and fuel consumption. This mathematical model is further implemented on the analytical software Matlab in order to produce the various consumption curves of the vehicles case study. A simulator which takes into consideration a vehicle’s engine data in order to produce specific consumption curves and provide valid information on the fuel consumption of the vehicle is developed from this mathematical model. It can be used in automotive construction companies and also by any individual.

scholarly journals Exploring and Expanding the Category of ‘Young Workers’ According to Situated Ways of Doing Risk and Safety—a Case Study in the Retail Industry

2013 ◽  
Vol 3 (3) ◽  
pp. 219 ◽  
Author(s):  
Mette Lykke Nielsen ◽  
Johnny Dyreborg ◽  
Pete Kines ◽  
Kent J. Nielsen ◽  
Kurt Rasmussen
Keyword(s):  
Young Adult ◽  
Individual Characteristics ◽  
Skilled Workers ◽  
School Dropouts ◽  
Cognitive Limitations ◽  
Age Related ◽  
Group Interviews ◽  
Student Workers ◽  
Retail Workers

Young adult workers aged 18–24 years have the highest risk of accidents at work. Following the work of Bourdieu and Tannock, we demonstrate that young adult workers are a highly differentiated group. Accordingly, safety prevention among young adult workers needs to be nuanced in ways that take into consideration the different positions and conditions under which young adult workers are employed. Based on single and group interviews with 26 young adult workers from six various sized supermarkets, we categorize young adult retail workers into the following five distinct groups: ‘Skilled workers,’ ‘Apprentices,’ ‘Sabbatical year workers,’ ‘Student workers,’ and ‘School dropouts.’ We argue that exposure to accidental risk is not equally distributed among them and offer an insight into the narratives of young adult workers on the subject of risk situations at work. The categorizations are explored and expanded according to the situated ways of ‘doing’ risk and safety in the working practices of the adult workers. We suggest that the understanding of ‘young’ as an age-related biological category might explain why approaches to prevent accidents among young employees first and foremost include individual factors like advice, information, and supervision and to a lesser degree the structural and cultural environment wherein they are embedded. We conclude that age cannot stand alone as the only factor in safety prevention directed at workers aged 18–24 years; if we do so, there is a risk of overemphasizing age-related individual characteristics such as awareness and cognitive limitations before structural, relational, and hierarchical dimensions at the workplace.

scholarly journals Analysis of Request for Proposals in Construction Industry

2016 ◽  
Vol 20 (1) ◽  
pp. 104 ◽  
Author(s):  
Michal Tkáč ◽  
Radoslav Delina ◽  
Martina Sabolová
Keyword(s):  
Construction Industry ◽  
Single Case ◽  
The Other ◽  
Pareto Analysis ◽  
Construction Companies ◽  
Potential Client ◽  
Other Hand ◽  
Quantitative Results ◽  
Main Barrier

<p><strong>Purpose:</strong> The purpose of this paper is to identify and determine reasons why construction companies reject some of the request for proposals (RFPS) suitable for them. <br /><strong>Methodology/Approach:</strong> The research has several parts. Within the first part the list of reasons which lead to rejection of RFPS and thus potential client are identified. Then the comparison of differences between groups of rejected RFPS with different configuration is made. The last part of research use Pareto analysis to determine most obvious and most costly reasons of rejection of RFPS. <br /><strong>Findings:</strong> The paper identifies 12 reasons, why construction companies decline to prepare proposal for their potential clients. It also doesn’t confirm that configuration of RFPS has significant impact on the rejection of RFPS. Moreover the results on the other hand showed that insufficient trust represent the main barrier which influences the rejection of RFPS in selected company.<br /><strong>Research Limitation/implication:</strong> The main limitation of the research is that it is based on single case study. Although, the quantitative results have to be generalised very carefully, on the other hand paper provide list of the possible reasons why construction companies decline to compete for an offer. <br /><strong>Originality/Value of paper:</strong> The paper provides unique perspective because apart from traditional attitude, where only the submitted RFPS are evaluated, this paper analyses rejected RFPS and tries to identify and determine reasons why construction companies decide not to prepare proposal and thus reduce the possibility to acquire new contract.</p>

The Drawings and the Modine of Francesco Pieroni for the Ministero delle Finanze in Rome

2019 ◽  
pp. 242-272
Author(s):  
Liliana Ninarello
Keyword(s):  
19Th Century ◽  
16Th Century ◽  
Archival Research ◽  
Construction Companies ◽  
Different Types ◽  
The 19Th Century ◽  
Work Done ◽  
Real Scale

The main focus of this chapter is the highly valued work done by the architect Francesco Pieroni at the Ministero delle Finanze in Rome. This contribution can to attribute to Pieroni various drawings and numerous modine, i.e. real scale cardboard templates of various shapes used in the realization phases of the mouldings. Pieroni's activity represents, in the Roman context, one of the first applications of typical 16th century mouldings, to modern and prefabricated metal bar structures, spreading in the 70's of the 19th century. The construction companies were resilient to agree for changes in building techniques due to a lack of expertise. The realization of the Ministero is a case study of this phenomenon. The archival research developed casts new light on the numerous modifications carried out by Peroni during construction phases, which demonstrate the accuracy employed by the architect in designing the stuccos. The chapter analyses two different types of archive documents: the report Spoglio modificazioni lavori di stucco, and the examples of modine authored by Pieroni.

scholarly journals Productivity assessment and its improvement strategies for small metal workshops

1970 ◽  
Vol 39 (1) ◽  
pp. 8-12
Author(s):  
MMA Khan ◽  
MA Islam ◽  
AFM Salahuddin ◽  
M Iqbal
Keyword(s):  
Case Study Research ◽  
Research Model ◽  
Skilled Workers ◽  
Productivity Improvement ◽  
Machine Material ◽  
Five Factors ◽  
Improvement Strategies ◽  
Total Productivity ◽  
The Impact

A case study research was conducted with a view to assess the impact of five factors such as man, machine, material, money, and safety on productivity. The scope of this study was limited only to small metal workshops, which produces customized independent products. 18 case studies were performed based on selected workshops of different categories (welding shops, repair shops, sheet metal shops). Total Productivity Model (TPM) has been used as the theoretical base of the research model. It has been identified that insufficiency of skilled workers, improper utilization of materials, inefficient inventory control, ineffective safety package etc., are the most critical obstacles to productivity improvement in terms of product and material and hence to the overall productivity improvement of the organization as a whole. Some productivity improvement strategies made on the basis of the observations and analysis are also included in this paper. Keywords: Assessment, Productivity, Total Productivity Model (TPM), and Small Metal Workshops. doi:10.3329/jme.v39i1.1827 Journal of Mechanical Engineering, vol. ME39, No. 1, June 2008 8-12

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