scholarly journals Comparative Evaluation of The Accuracies of Differential GPS and Total Station in Determining the Coordinates of Existing Controls

2021 ◽  
pp. 894-906
Author(s):  
Tijani Olaide ◽  
Prof J. I. Igbokwe ◽  
Prof M. N. Ono
Keyword(s):  
Statistical Analysis ◽  
Construction Projects ◽  
Accurate Method ◽  
Control Points ◽  
Dual Frequency ◽  
Differential Gps ◽  
Total Station ◽  
Satellite Positioning ◽  
Control Survey ◽  
High Degree

A Control survey is a survey operation that is carried out in order to establish position of points with a high degree of accuracy in order to support activities like mapping and map revisions, property boundary surveys, construction projects and so on. Control densification is a continuous exercise in the field of geomatics. This forms the basis upon which other geomatics and engineering activities geared toward development are referenced. This study is aimed at determining the coordinates of existing control points network along Ayetoro / Egbeda Atuba road using dual frequency GPS and Total Station with a view to comparing the accuracies of DGPS and Total Station using statistical analysis to determine which one has better accuracy. The Objectives of the study are to locate the existing control points, to collect the information/coordinates of the existing control points, and to carry out the observation using DGPS and Total station and process/compute the final coordinates and compare the results by using statistical analysis. The methodology that are adopted for this project is Satellite Positioning Technology using Differential Global Positioning System (DGPS) and Total Station. And the acquired data was processed and adjusted. The statistical analysis was used to compare the result obtained from DGPS and Total Station with the data collected from the Ministry of Land and Housing. The result of the analysis shows that DGPS has better accuracy. It is recommended that whenever more suitable and accurate method of measurement is to be employed, the DGPS method should be selected as this study has demonstrated and compared the accuracy of the two methods and showed that the DGPS method is better.

scholarly journals Avaliação de Desempenho no Georreferenciamento de Imagens do Sensor HR CCD (High Resolution Charge-Coupled Device) do Satélite CBERS-1

2005 ◽  
Vol 32 (2) ◽  
pp. 81
Author(s):  
RAFAEL PEREIRA ZANARDI ◽  
SILVIA BEATRIZ ALVES ROLIM ◽  
CLÁUDIO BIELENKI JÚNIOR ◽  
CARLOS ALUISIO MESQUITA DE ALMEIDA
Keyword(s):  
High Resolution ◽  
Geometric Transformation ◽  
Ground Control ◽  
Control Points ◽  
Differential Gps ◽  
Charge Coupled Device ◽  
Qualitative And Quantitative ◽  
Ground Control Points ◽  
Sampling Points ◽  
Nearest Neighborhood

In this work it was analyzed the validation of CBERS-1 (China and Brazillian Earth Resourses Satellite) data related to qualitative and quantitative parameters that define the precision of its georeferencing. A topographical survey was carried out for the acquisition of ground control points spatially well distributed in the study area, employing differential GPS, aiming at the georeferencing of the image. Tests with different numbers of sampling points and several methods of Geometric Transformation and Resampling were made during the georeferencing. These results were statistically analyzed to determine the best method to georeference CBERS-1 images. It was verified that the first-degree polinomial transformation with nearest neighborhood resampling presented the best result, showing a precision of 18,52m.

Scope Reductions as Tool for Cost Control in Construction Projects

2016 ◽  
pp. 733-748
Author(s):  
Nils O. E. Olsson
Keyword(s):  
Construction Projects ◽  
Best Practice ◽  
Cost Control ◽  
Actual Use ◽  
Scope Management ◽  
High Degree

Scope management is a key issue in construction projects. This paper studies scope reductions. Potential reductions of project scope as well as budget contingencies have been a tool for cost control of governmental investments in Norway since 2001. This paper studies implementation of such reduction in major construction projects in different governmental sectors. Project representatives were contacted to obtain information about actual use of pre-defined potential scope reductions. Eight of the 14 studied projects did not implement any of the predefined reductions. Six projects implemented some of the reductions. These reductions were mainly general reductions of the quality of the facilities. The Norwegian reduction lists are based on an unusually high degree of specification of potential actions for cost control. International best practice is more concerned with general approaches. To function as intended, possible reductions should be possible to implement late in a project. General contingencies appear to be more effective for cost control than predefined scope reductions.

scholarly journals Impact of Construction Productivity Attributes Over Construction Project Performance in Indian Construction Projects

2019 ◽  
Vol 50 (1) ◽  
pp. 89-96 ◽  
Author(s):  
Saurav Dixit ◽  
Kinshuk Saurabh
Keyword(s):  
Construction Projects ◽  
Positive Impact ◽  
Construction Project ◽  
Project Performance ◽  
Construction Productivity ◽  
Complex Projects ◽  
High Degree ◽  
The Relationship ◽  
Creative Construction ◽  
Similar Kind

Performance of a construction project could be influenced by a number of attributes, especially large and complex projects lay additional focus on the success / failure attributes, because of the intensive amount of money invested, a high degree of uncertainty, the complexity of personnel’s required, a multiplicity of goals and problems in coordination between different stakeholders encountered. In this research paper, the author intended to define and examine the relationship and impact of construction productivity (CP) over construction project performance (CPP). The author tests the proposition that there is a positive relationship/impact between both of them. And to test the effect of factors is affecting CP on CPP and to propose a conceptual model on the basis of the analysis. To validate the mathematical validity of factor analysis, Spearman correlation analysis has been performed on the factors. And to check the reliability of all the factors using reliability analysis, and finally test the hypothesis that construction productivity is having a positive impact on project performance using one sample t-test. The findings of the study concluded that there is a positive impact of construction productivity on project performance in Indian construction projects. This paper attempts to identify the relationship between CP and CPP and recommends the framework for the industry to grow sustainably and deliver projects successfully. This study is conducted using a structured questionnaire survey in India and to validate the results of the study similar kind of study is required to be conducted in the other regions of the country to have more reliable findings."This paper is the revised version of the paper that has been published in the proceedings of the Creative Construction Conference 2018: Dixit, S., Mandal, S. N., Thanikal, J. V, & Saurabh, K. (2018). Construction Productivity and Construction Project Performance in Indian Construction Projects, m(July), 379–386. https://doi.org/10.3311/CCC2018-050".

Evaluation of an Uncooled Focal Plane Array Infrared Camera for Effusion Cooling Research

2000 ◽  
Author(s):  
Scott K. McGhee ◽  
A. M. Birk
Keyword(s):  
Image Analysis ◽  
Statistical Analysis ◽  
Focal Plane ◽  
Low Cost ◽  
Infrared Camera ◽  
Thermocouple Calibration ◽  
On Line ◽  
Research Grade ◽  
Temperature Maps ◽  
High Degree

This study assessed a low-cost, uncooled ferroelectric detector infrared camera for effusion cooling research. Advances in uncooled IR technology have led to applications previously limited to research-grade cameras. The imager operated in the 7–14μm waveband and sampled up to 30 frames per second. Thermal images were made of a matte-black flat plate, downstream of two cylindrical jets with injection angles of α = 30° and 90°, and L/D = 6. Thermocouple calibration was specific to each image. Statistical analysis and image analysis yielded detailed temperature maps with uncertainty as small as 0.9°C, a spatial resolution of 0.4mm, and a sensitivity of 0.1 °C. The system compared favorably with established infrared systems. Advantages include minimal instrumentation, on-line results, and a high degree of accuracy and resolution, at significantly reduced cost.

scholarly journals A semantic-based framework for automated rule checking in healthcare construction projects

2020 ◽  
Vol 47 (2) ◽  
pp. 202-214
Author(s):  
Joao Soliman-Junior ◽  
Carlos T. Formoso ◽  
Patricia Tzortzopoulos
Keyword(s):  
Construction Projects ◽  
Design Science ◽  
Methodological Approach ◽  
Science Research ◽  
University Hospital ◽  
Healthcare Facilities ◽  
Theoretical Contribution ◽  
Rule Checking ◽  
Wide Range ◽  
High Degree

Healthcare projects are known for having a high degree of complexity. Furthermore, the design of healthcare facilities is highly constrained by regulations containing a wide range of requirements. Using BIM for automated rule checking has been pointed out as an opportunity to improve requirements management in these projects. However, most existing research is focused on hard-coded approaches or on limited sets of requirements. The aim of this investigation is to propose a semantic-based framework for automated rule checking in the context of healthcare design. An empirical study was conducted in the redevelopment of a university hospital, using Design Science Research as a methodological approach. Results indicate that the nature of regulations and the subjectivity of requirements have a major impact on the possibility of their translation into logical rules, which is needed to enable automated checking. The main theoretical contribution is a taxonomy for automated rule checking and information transformation.

scholarly journals Quantum risks of the extreme temperatures implementation in london

2019 ◽  
Vol 135 ◽  
pp. 01068
Author(s):  
Zhanna Mogiljuk
Keyword(s):  
Statistical Analysis ◽  
Construction Projects ◽  
Global Climate ◽  
Extreme Temperature ◽  
Road Construction ◽  
Engineering Systems ◽  
Extreme Temperatures ◽  
The Road ◽  
Statistical Studies ◽  
Temperature Loads

The article deals with current problems of the road construction projects adaptation to the global climate change realities. It is shown that the existing regulations do not take into account the risks of extreme thermal processes. The method for the events statistical analysis of the extreme temperature realization are presented. The high-resolution statistical studies results of previously unknown regularities of the maximum and minimum temperatures intensity fluctuations evolution in the period from 1973 to 2009 are presented. Quantitative forecasting of tendencies in realization of the maximum and minimum daily temperatures for the period of all life cycle of buildings is shown. These estimates are intended to account for extreme temperature loads in the design of road construction objects and engineering systems. The paper first presented quantum regularities of the air temperature variations in the surface layer of the atmosphere obtained by the author and previously unknown. As an example, the article deals with the statistical analysis of the extreme temperatures variations in London. The graphic materials over the statistical studies of the maximum and minimum temperatures intensity evolution a period of more than 36 years are presented. The results of studies of integral and differential trends into the maximum and minimum temperatures evolution are given. The article deals with the forecast of the warming expected rate in London until 2067.

Optimization by mixture design approach

2020 ◽  
Vol 18 (6) ◽  
pp. 1731-1747
Author(s):  
Yacine Abadou ◽  
Abderrahmane Ghrieb ◽  
Rosa Bustamante ◽  
Hayette Faid
Keyword(s):  
Experimental Data ◽  
Statistical Analysis ◽  
Flexural Strength ◽  
Mixture Design ◽  
Mixture Component ◽  
Lime Mortar ◽  
Content Type ◽  
Input Combination ◽  
High Degree ◽  
Marble Waste

Purpose The purpose of this study is to fit an appropriate mathematical model to express response variables as functions of the proportions of the mixture components. One purpose of statistical modeling in a mixture experiment is to model the blending surface such that predictions of the response for any mixture component, singly or in combination, can be made empirically. Testing of the model adequacy will also be an important part of the statistical procedure. Design/methodology/approach A series of mortar using air lime, marble and ceramic sanitary waste aggregates were prepared for statistically designed combinations. The combinations were designed based on the mixture-design concept of design of experiments; this mortar is often used as a filler material in restoration projects. The aim of this work is to find an optimal composition of a paste for the manufacture of air lime mortar with ceramic and marble waste. This investigation aims to recommend mix design for air lime-based mortar, by optimizing the input combination for different properties, and to predict properties such as mechanical strength, thermogravimetric and x-ray diffraction analysis with a high degree of accuracy, based on a statistical analysis of experimental data. Findings This paper discusses those mortar properties that architects, contractors and owners consider important. For each of these properties, the influence of ceramic and marble waste in the air lime mortar is explored. The flexibility of lime-based mortars with waste materials to meet a wide range of needs in both new construction and restoration of masonry projects is demonstrated. Originality/value The objective of the present investigation is to recommend mixture design for air lime mortar with waste, by optimizing the input combination for different properties, and to predict properties such as compressive strength, flexural strength with a high degree of accuracy, based on the statistical analysis of experimental data. The authors conducted a mixture design study that takes into account dependent parameters such as the constituents of our air lime-based mortar where we have determined an experiment matrix to which we have connected the two responses, namely, compressive and flexural strength. By introducing the desirability criteria of these two responses, using JMP software, we were able to obtain a mixture optimal for air lime mortar with ceramic and marble waste.

Sustainable procurement in the Canadian construction industry: challenges and benefits

2015 ◽  
Vol 42 (6) ◽  
pp. 417-426 ◽  
Author(s):  
Rajeev Ruparathna ◽  
Kasun Hewage
Keyword(s):  
Statistical Analysis ◽  
Construction Industry ◽  
Construction Projects ◽  
Waste Generation ◽  
Structured Interviews ◽  
Bottom Line ◽  
Sustainability Performance ◽  
Sustainable Procurement ◽  
Main Challenge ◽  
Harmful Emissions

Disregard of triple bottom line (TBL) of sustainability is one of the major drawbacks of current construction procurement practices. Sustainable procurement is an emergent concept that can improve procurement practices and enhance the sustainability performance of the construction industry as a whole. Presently, sustainable procurement is still not fully utilized in the Canadian construction industry. A comprehensive literature review showed that the construction industry is still not fully aware about the benefits of using sustainable procurement or ways of implementing the same. This study evaluates challenges encountered in implementing sustainable procurement in the Canadian construction industry. In addition, this study investigates perceptions of construction professionals on the benefits of using sustainable procurement for construction projects. A country wide questionnaire survey and semi-structured interviews were conducted to collect required data. A statistical analysis was performed to rank the challenges and benefits of sustainable procurement. Findings from semi-structured interviews were used to validate the results observed in the statistical analysis. This study revealed that lack of funding is the main challenge for implementing sustainable procurement, while reducing harmful emissions and waste generation was identified as the main benefit. It was concluded that the leadership and commitment of the project owners is the key to fully establish sustainable procurement in the Canadian construction industry.

Statistical analysis on the bandwidth of a dual frequency textile antenna

2015 ◽  
Vol 9 (15) ◽  
pp. 1683-1690 ◽  
Author(s):  
Esther Florence Sundarsingh ◽  
Vimal Samsingh Ramalingam ◽  
Malathi Kanagasabai
Keyword(s):  
Statistical Analysis ◽  
Dual Frequency ◽  
Textile Antenna
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