scholarly journals Organizational and technological parameters of facade works and influencing factors

2021 ◽  
Vol 263 ◽  
pp. 04054
Author(s):  
Mukhammet Fakhratov ◽  
Ibrahim Fadhil
Keyword(s):  
Construction Management ◽  
Point Of View ◽  
Design Stage ◽  
Technological Changes ◽  
Construction Work ◽  
Technological Parameters ◽  
Different Dimensions ◽  
Technical And Economic Indicators ◽  
Selection Of ◽  
Construction Works

The article deals with the organizational and technological features of construction. The organization of construction production for the installation of facade systems with an air gap during the construction of buildings is associated with coordination with general construction works. Often, construction management projects developed at the design stage are adjusted taking into account the current conditions. These changes can occur both before the start of work and during the production of work. The introduction of organizational and technological changes in the production process of work can lead to a significant decrease in technical and economic indicators. In this regard, it is relevant to resolve the issues of assessment and selection of effective organizational and technological solutions for the device of facade systems. The difficulty is the assessment of factors with different dimensions of quantitative and qualitative indicators. Installation of facade systems is a work performed in the open air, in connection with which there are factors that have a rather strong influence on the complexity of the work. In addition, as with any other construction work, it depends on the completion of other construction work. Another important feature of the organization of facade work is the orientation of the work front in the unfamiliar plane of the building. The study of this type of work is relevant and is of interest from a scientific point of view, not only in matters of constructive solutions for and organization of work and the use of appropriate machines and mechanisms. A well-grounded choice of technological equipment and the number and qualification of workers will increase the performance of work.

scholarly journals Organizational and technological solutions during the production facade works

2021 ◽  
Vol 258 ◽  
pp. 09023
Author(s):  
Muhammad Fahratov ◽  
Ibrahim F. Ibrahim
Keyword(s):  
Production Process ◽  
Construction Management ◽  
Design Stage ◽  
Labor Intensity ◽  
Construction Site ◽  
Technological Changes ◽  
Sufficient Detail ◽  
Technical And Economic Indicators ◽  
Selection Of ◽  
Construction Works

The article deals with the organizational and technological features of construction. Currently, based on foreign and domestic experience, a significant number of regulatory and methodological documents have been developed for the use of facade systems, but these works do not fully disclose organizational and technological issues and contain only general recommendations for the production of work. In particular, the existing recommendations for the installation of facade systems, for the most part, describe the constructive solutions of facade systems, technological issues related directly to the installation of the facade system, while not disclosing in sufficient detail the organization of the construction site, the issues of choosing the necessary means of paving, the issues of standardizing the labor intensity of work, issues of quantitative and qualitative selection of the composition of workers for the production of work. The organization of construction production for the installation of hinged facade systems with an air gap during the construction of buildings is associated with coordination with general construction works. Often, construction management projects developed at the design stage are adjusted taking into account the current conditions. These changes can occur both before the start of work and during the production of work. The introduction of organizational and technological changes in the production process of work can lead to a significant decrease in technical and economic indicators. In this regard, it is relevant to resolve the issues of assessment and selection of effective organizational and technological solutions for the device of facade systems.

scholarly journals Risk factors for delays in rail investments implemented in the Design & Build contracts

2019 ◽  
Vol 262 ◽  
pp. 07007 ◽  
Author(s):  
Jan Kowalski ◽  
Mieczysław Połoński ◽  
Marzena Lendo – Siwicka
Keyword(s):  
Repeated Measures ◽  
Design Stage ◽  
Professional Experience ◽  
Repeated Measures Anova ◽  
Design Build ◽  
Investment Process ◽  
Causes Of Delays ◽  
Key Participants ◽  
Selection Of ◽  
Construction Works

The article presents the results of nationwide surveys on the causes of delays during the implementation of rail investments in Poland, carried out in the Design & Build formula for the design stage. The study did not examine typical causes of threats to general construction works, only those that result from the specifics of works at rail facilities. The survey was conducted with the participation of experts from various industries, representing all the key participants in the investment process. The selection of experts was limited to people who have extensive professional experience in implementing rail projects. Statistical analyzes were performed using the IBM SPSS Statistics 23 package. It was used to test χ2 and a one-way repeated measures ANOVA. The greatest threats to the deadlines for the implementation of rail investments in Poland, which were indicated by the respondents as the delay threats of a high importance are: negligence in the preparation of tender documents and problems with obtaining current maps for project purposes from rail geodesic centers. The research results can be helpful when planning future rail investments, calculating the necessary time reserves and increasing the reliability of the set dates of their completion.

scholarly journals Selection of Clothing for a Cold Environment by Predicting Thermophysiological Comfort Limits

2017 ◽  
Vol 25 (0) ◽  
pp. 95-101 ◽  
Author(s):  
Radostina Angelova ◽  
Elena Georgieva ◽  
Priscilla Reiners ◽  
Yordan Kyosev
Keyword(s):  
Weather Conditions ◽  
Point Of View ◽  
The Body ◽  
Design Stage ◽  
Cold Environment ◽  
Clothing Insulation ◽  
Cold Environments ◽  
Selection Of

Results are presented from a study on the prediction of the insulation abilities of outerwear clothing for cold protection from the point of view of the thermophysiological comfort of the wearer. The Required Clothing Insulation (IREQ) index is used to simulate the abilities of 14 assemblies of layers designed for the production of winter jackets to protect the body in different cold environments. The calculations allow to assess the limits of applicability of the garments in terms of the thermophysiological comfort assured, the activities performed and the weather conditions. Discussions are presented on the correspondence between ISO11079:2007 and the online JavaScript code for calculation of IREQ based on it. The results predicted and their analysis have a practical use, as they allow to estimate the cold protection effectiveness of the textile layers used in an assembly at the design stage, thusgiving room for necessary changes depending on the conditions of its use.

scholarly journals The Optimal Location of Ground-Based GNSS Augmentation Transceivers

Geosciences ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 107 ◽  
Author(s):  
Jacek Rapinski ◽  
Artur Janowski
Keyword(s):  
Wide Band ◽  
Optimal Location ◽  
Point Of View ◽  
Global Navigation Satellite Systems ◽  
Design Stage ◽  
Shift Measurement ◽  
Satellite Systems ◽  
Global Navigation Satellite ◽  
Selection Of

Modern Global Navigation Satellite Systems (GNSS) allow for positioning with accuracies ranging from tens of meters to single millimeters depending on user requirements and available equipment. A major disadvantage of these systems is their unavailability or limited availability when the sky is obstructed. One solution is to use additional range measurements from ground-based nodes located in the vicinity of the receiver. The highest accuracy of distance measurement can be achieved using ultra wide band (UWB) or ZigBee phase shift measurement. The position of the additional transmitter must be carefully selected in order to obtain the optimal improvement in the dilution of precision (DOP), which reflects the improvement in the geometry of solution. The presented case study depicts a method for selecting the optimal location of a ground-based ranging source. It is based on a search of a minimum DOP value as a transmitter location function. The parameters of objective function are the elevation and azimuth of the transceiver. The solution was based on a limited-memory Broyden–Fletcher–Goldfarb–Shanno with Box constraints (L-BFGS-B) method and a numerical optimization algorithm for parameter value estimation. The presented approach allows for the selection of the optimal location of a ground-based source of ranging signals in GNSS processing from a geometry of solution point of view. This can be useful at the design stage of an augmentation network of ground-based transceivers. This article presents a theoretical basis and a case study presenting the selection of the optimal location of a ground-based ranging source.

scholarly journals ADOPTION OF DECISIONS FOR CONTROL OF COMPLEX MULTI-STAGE TECHNOLOGICAL SYSTEMS UNDER CONDITIONS OF UNCERTAINTY

2018 ◽  
Vol 22 (4) ◽  
pp. 104-111
Author(s):  
E. G. Kabulova
Keyword(s):  
Point Of View ◽  
Technological Systems ◽  
Technological Parameters ◽  
Individual Values ◽  
Heterogeneous Information ◽  
Metallurgical Production ◽  
Fuzzy Measures ◽  
Use Of Data ◽  
Multi Stage ◽  
Technical And Economic Indicators

Today metallurgical production from the point of view of management and multistage character of production is complex, big system with various features of functioning of subsystems and elements. Traditional methods for the management of such systems are ineffective, as one of the main problems is the choice of optimal management decisions, taking into account current situations and limitations on changes in the values of technological parameters. One of the problems arising in the management of complex technological systems of metallurgical production is the heterogeneity of a large amount of data, which complicates the process of making effective and operational decisions in the management of production. Adequate decision-making by the expert is connected with the need to aggregate various kinds of information at different levels of the hierarchy. In addition, the operation of real complex systems of metallurgical production takes place in conditions of uncertainty of information, and to implement effective management, to organize decision support, to ensure the efficiency and accuracy of information to improve the quality of metal products and technical and economic indicators of production in this case is not possible. In this connection, the paper proposes a model of integration of heterogeneous information under uncertainty, which will take into account the measure of importance not only of individual values of technological parameters at a certain stage of production, but also a set of such parameters through the use of fuzzy measures in the integration of data. This model will improve the accuracy of determining the required values of technological parameters by taking into account all stages of production, technological operations, as well as through the use of data aggregation at each stage. The peculiarity of the developed model is the possibility of applying corrective procedures for the sequential adaptation of membership functions of fuzzy parameters.

scholarly journals Risk Analysis in the Realization of Buildings in Revitalized Areas

2019 ◽  
Vol 65 (3) ◽  
pp. 113-126
Author(s):  
A. Sobotka ◽  
A. Radziejowska
Keyword(s):  
Risk Analysis ◽  
Urban Development ◽  
Construction Management ◽  
Legal Regulations ◽  
Construction Work ◽  
Existing Building ◽  
Execution Phase ◽  
Methods And Techniques ◽  
Risk Sources ◽  
Construction Works

AbstractConstruction work on buildings covered by the revitalization program of historic urban development represents a special type of construction project in which, in the execution phase, difficult technical situations and other risk sources are being encountered. An important source of risk is the necessity to preserve a part of the historic substance, which results, among others, from the recommendations of the conservator, legal regulations or from the vision of the architect/investor. The risk is also associated with difficulties and complications in construction works resulting from the location of these objects in dense urban development. The aim of the article is to identify risk factors and reactions of contractors, i.e. applied risk management methods and techniques, based on the example of a complex of buildings constructed in the historic district of Krakow. The elimination of sources of risk, especially of a technical nature, requires the construction management to be highly skilled and experienced, to carefully prepare the construction work and to design additional solutions to ensure safety at work. The experience gained may serve as a basis for risk analysis and identification during the implementation of projects involving the use of an existing building and historic substance in areas subject to revitalization programs.

scholarly journals Application of Game Theory to Conflict Management in a Construction Contract

2019 ◽  
Author(s):  
Beata Grzyl ◽  
Magdalena Apollo ◽  
Adam Kristowski
Keyword(s):  
Game Theory ◽  
Point Of View ◽  
Investment Risk ◽  
Financial Perspective ◽  
Common Causes ◽  
The Subject ◽  
Court Proceedings ◽  
Expected Payoffs ◽  
Selection Of ◽  
Construction Works

Recently there has been growing interest in the application of game theory (GT) to solve many diverse problems in the field of construction, including i.a.: tender preparation, selection of a contractor for construction works, negotiating terms and conditions of cooperation of the parties to the contract, analysis and modeling of investment risk. In the authors opinion, the use of GT by general contractor (GC) of construction works to indicate the best strategy leading to winning court proceedings in a situation of conflict with investor (IN), so far has not been the subject of research. Taking into account the above, the aim of the presented paper is to indicate the optimal strategy from the GC point of view in the conflict situation with IN. The article presents a list of the most common causes of conflicts between parties of the construction works' contract, defines the background of the problem and the cause of the dispute, and on its basis, the authors generate the theoretical model of the game. Based on the analyzed game model, expected payoffs for players were calculated and the probability border value at which GC should apply the indicated strategy determined. The results of the study show that in the case when the probability of issuing a judgment favorable for GC is at least equal to 69.23%, it is justified to use an aggressive strategy. The analysis also confirms that from the financial perspective, litigation in most cases of conflicts in the area of construction should be the last choice.

Tauchnitz for Translators. The Circulation of English-language Literature in Finland

2019 ◽  
Vol 16 (2-3) ◽  
pp. 161-179
Author(s):  
Outi Paloposki
Keyword(s):  
Foreign Language ◽  
English Language ◽  
Book History ◽  
Language Skills ◽  
Point Of View ◽  
Book Production ◽  
German Publisher ◽  
Language Literature ◽  
Selection Of

The article looks at book production and circulation from the point of view of translators, who, as purchasers and readers of foreign-language books, are an important mediating force in the selection of literature for translation. Taking the German publisher Tauchnitz's series ‘Collection of British Authors’ and its circulation in Finland in the nineteenth and early twentieth century as a case in point, the article argues that the increased availability of English-language books facilitated the acquiring and honing of translators' language skills and gradually diminished the need for indirect translating. Book history and translation studies meet here in an examination of the role of the Collection in Finnish translators' work.

COMBINATORIAL POLYNOMIALLY COMPUTABLE CHARACTERISTICS OF SUBSTITUTIONS AND THEIR PROPERTIES

2020 ◽  
Vol 7 (2) ◽  
pp. 34-41
Author(s):  
VLADIMIR NIKONOV ◽  
◽  
ANTON ZOBOV ◽  
Keyword(s):  
Mathematical Expectation ◽  
Point Of View ◽  
Small Range ◽  
Computational Point ◽  
Wide Range ◽  
Bijective Function ◽  
The Difference ◽  
Element Base ◽  
Selection Of

The construction and selection of a suitable bijective function, that is, substitution, is now becoming an important applied task, particularly for building block encryption systems. Many articles have suggested using different approaches to determining the quality of substitution, but most of them are highly computationally complex. The solution of this problem will significantly expand the range of methods for constructing and analyzing scheme in information protection systems. The purpose of research is to find easily measurable characteristics of substitutions, allowing to evaluate their quality, and also measures of the proximity of a particular substitutions to a random one, or its distance from it. For this purpose, several characteristics were proposed in this work: difference and polynomial, and their mathematical expectation was found, as well as variance for the difference characteristic. This allows us to make a conclusion about its quality by comparing the result of calculating the characteristic for a particular substitution with the calculated mathematical expectation. From a computational point of view, the thesises of the article are of exceptional interest due to the simplicity of the algorithm for quantifying the quality of bijective function substitutions. By its nature, the operation of calculating the difference characteristic carries out a simple summation of integer terms in a fixed and small range. Such an operation, both in the modern and in the prospective element base, is embedded in the logic of a wide range of functional elements, especially when implementing computational actions in the optical range, or on other carriers related to the field of nanotechnology.

Der Sommer und Herbst 2003 aus phänologischer Sicht | Summer and autumn 2003 from a phenological point of view

2004 ◽  
Vol 155 (5) ◽  
pp. 142-145 ◽  
Author(s):  
Claudio Defila
Keyword(s):  
Time Series ◽  
New Record ◽  
Point Of View ◽  
Late Spring ◽  
Mean Deviation ◽  
Leaf Shedding ◽  
The Mean ◽  
Very High ◽  
Selection Of

The record-breaking heatwave of 2003 also had an impact on the vegetation in Switzerland. To examine its influences seven phenological late spring and summer phases were evaluated together with six phases in the autumn from a selection of stations. 30% of the 122 chosen phenological time series in late spring and summer phases set a new record (earliest arrival). The proportion of very early arrivals is very high and the mean deviation from the norm is between 10 and 20 days. The situation was less extreme in autumn, where 20% of the 103 time series chosen set a new record. The majority of the phenological arrivals were found in the class «normal» but the class«very early» is still well represented. The mean precocity lies between five and twenty days. As far as the leaf shedding of the beech is concerned, there was even a slight delay of around six days. The evaluation serves to show that the heatwave of 2003 strongly influenced the phenological events of summer and spring.

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