Post simulation visualization model for effective scheduling of modular building construction1This paper is one of a selection of papers in this Special Issue on Construction Engineering and Management.

2012 ◽  
Vol 39 (9) ◽  
pp. 1053-1061 ◽  
Author(s):  
Mansooreh Moghadam ◽  
Mohamed Al-Hussein ◽  
Saad Al-Jibouri ◽  
Avi Telyas

The factory-based modular construction process has proven to increase the speed of construction, and improve quality and safety, while providing value to the customer and a rapid return on investment to the builder and owner. However, onsite module assembly creates new schedule demands, as activities are scheduled on a minute-by-minute basis; therefore simulation of the process becomes essential at early stages of a project. Although simulation proves to be an effective tool for project engineers to assess complex construction operations, it remains a symbolic base model with no visual link to the actual physical shape and look of the project’s activities. This paper presents the application of integrated simulation and post simulation visualization as a tool to assist the modular construction industry in scheduling onsite installation of prefabricated modules. The proposed methodology uses simulation model output as an ASCII file in a binary format and imports this ASCII file to 3D Studio Max to perform the animation. The output from the high level simulation model is transformed into frames/second in 3D Studio Max. The proposed methodology was tested on the planned construction of a 34-storey building in Brooklyn, New York, USA. Simulation visualization of the process proved to be effective in communicating the value and simplicity of a minute-by-minute schedule. Based on the output information, the most efficient solutions were generated. The use of post simulation visualization was effective in analyzing the construction methods of the case study which consisted of 950 structural steel modules. Issues related to construction activities’ productivity were synchronized to achieve onsite installation of the project in only 56 working days.


Author(s):  
Michael W. Robey ◽  
Raja R.A. Issa

The construction industry continues to experience productivity rates that lag behind other industries. Additionally, an increasingly competitive market and a decreasing skilled labor pool are challenging construction firms. Prefabrication and offsite modular construction techniques offer alternatives to traditional site-built construction methods that have the potential to provide improved productivity as well as other added benefits. Prefabrication methods, applied effectively, offer results that produce value to the project team. Such value includes improved productivity and efficiency in construction operations, reduced project costs, reduced schedule durations, and improved safety, increased levels of quality and improved sustainability and waste reduction. Currently the implementation of prefabrication and offsite construction techniques on the construction project remains subjective and unstandardized. The aim of this research is to develop a framework that will assist the project team to make decisions regarding the use of prefabrication and modular construction based on factors that have proven to be the most successful in implementing modern methods of construction. The concentration is on emphasizing the use of Building Information Modeling and Lean Construction methods as catalysts to maximize the effectiveness of the use of modular offsite construction. This research is primarily toward the use of prefabrication and modular construction methods for vertical construction and should prove valuable for all project players including Owners, Designers and Constructors. The development of this framework utilizes information compiled through interviews and case studies to develop a proposed framework for implementing prefabrication and off-site modular construction techniques at the project level. The framework will be validated in the future using a Delphi survey to qualitatively generate quantified data on the best methods to implement prefabrication and offsite construction techniques.



Author(s):  
Lichao Xu ◽  
Szu-Yun Lin ◽  
Andrew W. Hlynka ◽  
Hao Lu ◽  
Vineet R. Kamat ◽  
...  

AbstractThere has been a strong need for simulation environments that are capable of modeling deep interdependencies between complex systems encountered during natural hazards, such as the interactions and coupled effects between civil infrastructure systems response, human behavior, and social policies, for improved community resilience. Coupling such complex components with an integrated simulation requires continuous data exchange between different simulators simulating separate models during the entire simulation process. This can be implemented by means of distributed simulation platforms or data passing tools. In order to provide a systematic reference for simulation tool choice and facilitating the development of compatible distributed simulators for deep interdependent study in the context of natural hazards, this article focuses on generic tools suitable for integration of simulators from different fields but not the platforms that are mainly used in some specific fields. With this aim, the article provides a comprehensive review of the most commonly used generic distributed simulation platforms (Distributed Interactive Simulation (DIS), High Level Architecture (HLA), Test and Training Enabling Architecture (TENA), and Distributed Data Services (DDS)) and data passing tools (Robot Operation System (ROS) and Lightweight Communication and Marshalling (LCM)) and compares their advantages and disadvantages. Three specific limitations in existing platforms are identified from the perspective of natural hazard simulation. For mitigating the identified limitations, two platform design recommendations are provided, namely message exchange wrappers and hybrid communication, to help improve data passing capabilities in existing solutions and provide some guidance for the design of a new domain-specific distributed simulation framework.



Author(s):  
Coby Klein ◽  
Mitchell Baker ◽  
Andrei Alyokhin ◽  
David Mota-Sanchez

Abstract Eastern New York State is frequently the site of Colorado potato beetle (Leptinotarsa decemlineata, Say) populations with the highest observed levels of insecticide resistance to a range of active ingredients. The dominance of a resistant phenotype will affect its rate of increase and the potential for management. On organic farms on Long Island, L. decemlineata evolved high levels of resistance to spinosad in a short period of time and that resistance has spread across the eastern part of the Island. Resistance has also emerged in other parts of the country as well. To clarify the level of dominance or recessiveness of spinosad resistance in different parts of the United States and how resistance differs in separate beetle populations, we sampled in 2010 beetle populations from Maine, Michigan, and Long Island. In addition, a highly resistant Long Island population was assessed in 2012. All populations were hybridized with a laboratory-susceptible strain to determine dominance. None of the populations sampled in 2010 were significantly different from additive resistance, but the Long Island population sampled in 2012 was not significantly different from fully recessive. Recessive inheritance of high-level resistance may help manage its increase.



2021 ◽  
Vol 13 (11) ◽  
pp. 5795
Author(s):  
Sławomir Biruk ◽  
Łukasz Rzepecki

Reducing the duration of construction works requires additional organizational measures, such as selecting construction methods that assure a shorter realization time, engaging additional resources, working overtime, or allowing construction works to be performed simultaneously in the same working units. The simultaneous work of crews may affect the quality of works and the efficiency of construction processes. This article presents a simulation model aimed at assessing the impact of the overlap period on the extension of the working time of the crews and the reduction of a repetitive project’s duration in random conditions. The purpose of simulation studies is to provide construction managers with guidelines when deciding on the dates of starting the sequential technological process lines realized by specialized working crews, for sustainable scheduling and organization of construction projects.



Author(s):  
Robert Collyer ◽  
Hasan Ahmed ◽  
Raj Navalurkar ◽  
Dawn Harrison

<p>The Brooklyn Bridge is a National Historic Landmark and a New York City Landmark that has been in use for over 137 years. This is one of the most pictured bridge structures in the world, while being used as a critical and vital part of the infrastructure carrying over 105,000 vehicles per day. This paper addresses the engineering challenges/solutions related to the most current rehabilitation work being performed.</p><p>Contract 6 (2009 to 2017) represents a $650 million investment into the bridge to maintain it in a State of Good Repair. Work included deck replacement using accelerated bridge construction techniques and complete painting and steel repairs of the main span. A high-level traffic study and traffic simulations were developed to evaluate differing closure scenarios and their impacts on user costs and the traveling public.</p><p>Contract 6A (2017 to 2019) represents a $25 million investment in maintaining the historic and aesthetic integrity of the Brooklyn Bridge structures. Approximately, 30,000 SF of granite stone cladding will be replaced under this contract.</p><p>Contract 7 represents a $300 million investment that will address the rehabilitation of the historic arches on both sides of the main span and strengthening of the Towers. Construction is expected to begin in 2019.</p><p>Contract 8 represents a $250 million investment. It is in the planning phase and will address a new promenade enhancement (widening) over the Brooklyn Bridge.</p><p>This paper discusses how these engineering challenges were faced and resolved.</p>



2017 ◽  
Vol 5 (3) ◽  
pp. 682-693 ◽  
Author(s):  
Víctor Genina

On September 19th, 2016, the United Nations (UN) General Assembly adopted Resolution 71/1, the text of the New York Declaration for Refugees and Migrants (the “New York Declaration”). Resolution 71/1 is the outcome document of the high-level plenary meeting on addressing large movements of refugees and migrants, held at the UN headquarters. The New York Declaration reflects how UN member states have decided to address the challenge of large movements of people in two main legal categories: asylum seekers/refugees and migrants. Resolution 71/1 includes an annex titled “Towards a Global Compact for Safe, Orderly and Regular Migration” (the “global compact for migration” or “global compact”). This document is comprised of several thematic issues related to international migration that will be the basis of a globally negotiated agreement on how member states should respond to international migration at the national, regional, and international levels, as well as to issues related to international migration and development. The global compact for migration is intended to be adopted at a conference on international migration and development before the inauguration of the 73rd annual session of the UN General Assembly in September 2018. This paper addresses how UN member states should plan to address international migration in the future. It does not refer to refugees and asylum seekers: a global compact on refugees will be drafted by the United Nations High Commissioner for Refugees (UNHCR) in 2018, and to be presented to the UN General Assembly for states' consideration during its 73rd annual session, which starts in September 2018.1 For those who have been involved in migration issues within the United Nations, the fact that member states have finally agreed to convene an international conference on international migration represents a major achievement. It is the result of an extended process that started decades ago and was made possible by a long chain of efforts by many state delegations and other stakeholders. The global compact for migration will not be the first outcome document dealing exclusively with international migration. A declaration2 adopted at a high-level meeting at the United Nations in October 2013, for example, paved the way for the 2018 conference. Nonetheless, the global compact represents a unique opportunity to address international migration comprehensively and humanely. This paper contributes to the discussion on the elements that should be included in the global compact for migration. The paper is divided into two sections. The first section analyzes the main elements of Annex II, “Towards a Global Compact for Safe, Orderly and Regular Migration,” and the criteria that needs to be adopted in order to achieve a substantive outcome. In particular, participants in the negotiation process should aim to balance the concerns of states and the members of host societies, on one hand, with the needs and rights of migrants, on the other. The second section includes proposals to enrich the final global compact for migration and takes into account two documents written by two different actors within the UN system, the Special Representative of the Secretary-General on Migration, and the Special Rapporteur on the Human Rights of Migrants. In particular, the paper proposes that the global compact for migration: • sets forth principles that can inform the actions of governments in relation to international migration at all levels; • enunciates a clearer definition of state protection responsibilities in relation to migrants in crisis situations and so-called “mixed flows”3; affords a substantive role to civil society organizations, the private sector, and academic institutions in the global compact's follow-up and review process; • defines the institutional framework for the implementation and follow-up of the global compact within the United Nations, including through the work of the UN High-level Political Forum on Sustainable Development (HLPF); • establishes a mechanism to fund migration policies for states that lack enough resources to invest sufficiently in this task; and • builds a cooperation-oriented, peer-review mechanism to review migration policies. The paper has been conceived as an input for those who will take part in the negotiation of the global compact for migration, as well as those who will closely follow those negotiations. Thus, the paper assumes a level of knowledge on how international migration has been addressed within the United Nations during the last several years and of the complexities of these negotiation processes. The author took part in different UN negotiation processes on international migration from 2004 to 2013. The paper is primarily based on this experience.4



2019 ◽  
pp. 534-541
Author(s):  
O. Golbasi ◽  
M. Olmez Turan ◽  
C. Karpuz


2020 ◽  
Author(s):  
J. G. Dai ◽  
Mark Gluzman ◽  
Alyf Janmohamed ◽  
Yaosheng Xu

This paper develops an algorithm to predict the number of Covid-19 patients who will start to use ventilators tomorrow. This algorithm is intended to be utilized by a large hospital or a group of coordinated hospitals at the end of each day (e.g. 8pm) when the current number of non-ventilated Covid-19 patients and the predicated number of Covid-19 admissions for tomorrow are available. The predicted number of new admissions can be replaced by the numbers of Covid-19 admissions in the previous d days (including today) for some integer d ≥ 1 when such data is available. In our simulation model that is calibrated with New York City's Covid-19 data, our predictions have consistently provided reliable estimates of the number of the ventilator-starts next day. This algorithm has been implemented through a web interface at covidvent.github.io, which is available for public usage. Utilizing this algorithm, our paper also suggests a ventilator ordering and returning policy. The policy will dictate at the end of each day how many ventilators should be ordered tonight from a central stockpile so that they will arrive by tomorrow morning and how many ventilators should be returned tomorrow morning to the central stockpile. In 100 runs of operating our ventilator order and return policy, no patients were denied of ventilation and there was no excessive inventory of ventilators kept at hospitals.



2011 ◽  
Vol 104 (1) ◽  
pp. 1-12 ◽  
Author(s):  
David Parsons ◽  
Charles F. Nicholson ◽  
Robert W. Blake ◽  
Quirine M. Ketterings ◽  
Luis Ramírez-Aviles ◽  
...  


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