The determination of working time and gelation time of temporary soft lining materials

1997 ◽  
Vol 13 (3) ◽  
pp. 186-191 ◽  
Author(s):  
Hiroshi Murata ◽  
John F. McCabe ◽  
Nicholas J. Jepson ◽  
Taizo Haxnada
Keyword(s):  
MICC 90 ◽  
1991 ◽  
pp. 401-411
Author(s):  
Andrey I. Koltakov ◽  
Pavel G. Kudryavtsev
Keyword(s):  

Author(s):  
Mykola Lykhostup ◽  
◽  
Yuriy Varfolomeev ◽  

The constant aspiration of a person to replace manual labor with the work of machines and mechanisms is reproduced in such concepts as "mechanization", "automation", "machine-tool" and others. In the construction industry, the most common and most favorable for the disclosure of this desire is an indicator of the level of mechanization. But in the techniques and recommendations that provide advice on the definition of this indicator, its calculation is carried out using generalizations of mechanization of labor without giving any clear representations as to the determination of production volumes in a purely mechanized way.The article reveals the essence of the indicator of the level of mechanization of road production, which determines the expediency of improving the structure of the main production assets of the enterprise for the implementation of such a program of work, which would contribute to maximizing profits. In general, the definition of the rational level of mechanization is based on the implementation of an iterative algorithm, which includes a number of stages.Thus, at the first stage, the initial (basic) program of a road organization is determined using data on the quantity and quality of the main production assets and the usual program of work for this enterprise. Determining the structure of this program, consisting of a number of road works and labor processes, in turn, is carried out using the developed algorithm, which involves the maximum technological use of all types of resources, including technical, which contribute to the mechanized mode of work. Next, using the data on the structure of the works, it is possible to obtain the estimated value of profit that can be obtained as a result of the implementation of the initial program of work. On the basis of the information about the estimated value of profit formed part of it in the form of a production development fund. The size of the fund for the development of production is the basis for reforming the machine park of the road organization. Options for changing the quantitative and qualitative composition of the machine park include the steps to assess their residual value, the purchase of new machines, major repairs or replacement of existing units of equipment. Using the data of various variants of the modernization of the park of machines and mechanisms, the corresponding changes for working hours for them are determined for the year, that is, the initial annual of working time is recalculated. The updated information on annual working time funds is used to determine the appropriate modifications to the park of machines of the work program of the road organization. For each option of updated programs of work determined by the calculated profit, and its maximum value is approved rational program of work. At the last stage, using data on total costs of manual and mechanized labor, as well as data on the total number of performers, indicators are calculated that characterize the level of mechanization of a road enterprise. The obtained indicators, as characteristics of the level of mechanization, can be used to solve various tasks in the field of road production management.


2014 ◽  
Vol 38 (3) ◽  
pp. 289-304
Author(s):  
Dragan Ćoćkalo ◽  
Sanja Stanisavljev ◽  
Dejan Đorđević ◽  
Milivoj Klarin ◽  
Aleksandar Đ. Brkić

A model for the stochastic determination of the elements of production cycle time is proposed and experimentally verified in this survey. The originality of the model as reflected in the idea of using a work sampling model to monitor the production cycle is one of the most significant indicators of production effectiveness and efficiency, instead of applying classical methods. It has been experimentally proved that for a corresponding representative set the elements of working time range according to normal distribution law and that, dynamically viewed, it is possible to use mean value calculations to establish control limits on three standard deviations for the individual elements of working time and thus to master the process. Based on our experimental investigations, it has been proved that in the practice of small and medium-sized enterprises with serial production it is possible to design and apply a very simple but accurate enough stochastic model to determine the elements of working cycle time and in this way optimize the duration of production cycle time.


2015 ◽  
Vol 61 (3) ◽  
pp. 51-62 ◽  
Author(s):  
E. Plebankiewicz ◽  
M. Juszczyk ◽  
J. Malara

AbstractThe article presents briefly several methods of working time estimation. However, three methods of task duration assessment have been selected to investigate working time in a real construction project using the data collected from observing workers laying terrazzo flooring in staircases. The first estimation has been done by calculating a normal and a triangular function. The next method, which is the focus of greatest attention here, is PERT. The article presents a way to standardize the results and the procedure algorithm allowing determination of the characteristic values for the method. Times to perform every singular component sub-task as well as the whole task have been defined for the collected data with the reliability level of 85%. The completion time of the same works has also been calculated with the use of the KNR. The obtained result is much higher than the actual time needed for execution of the task calculated with the use of the previous method. The authors argue that PERT is the best method of all three, because it takes into account the randomness of the entire task duration and it can be based on the actual execution time known from research.


1989 ◽  
Vol 43 (5) ◽  
pp. 821-826
Author(s):  
Haruki Oishi ◽  
Yasumichi Hatayama ◽  
Masaji Fusamoto ◽  
Yoshitsugu Sakata

A turbidimetric-kinetic photometer which monitors 64 samples simultaneously and independently has been developed for the automated measurement of endotoxin. This instrument measures the turbidity change at 660 nm in a gelation reaction of the LAL/endotoxin system and automatically scores the reaction time required to obtain a certain turbidity change as gelation time. Since a stationary dry bath incubator controls the reaction temperature of the samples at 37 ± 0.5°C and also controls the ambience of the optical system assembled into the incubator, the objective detection of gelation is provided without any disturbance from sample vibration, and the drift of the detection system is minimized. An extremely wide range for the calibration curve, such as 4 or 5 orders of magnitude of endotoxin concentration, is obtained without sample dilution. The coefficients of variation of the calculated endotoxin concentration are 4.91 to 14.0%.


2021 ◽  
Vol 9 (2) ◽  
Author(s):  
Roymon Panjaitan ◽  
Myra Andriana ◽  
Tantik Sumarlin

Determination of the number of workers, costs, and working time into a standard measure of the working time of a product. Time efficiency and production reports become complex issues of the importance of production timeliness. The purpose of this study is to provide a design of an information system for determining working time standards that can be accessed integrated into a more efficient report form. Methods used with research and development where data collected from observations, interviews from case studies in the field. Determination of uptime standards using time study methods developed into web-based information systems using PHP programming languages with MySQL databases. The results of the design of this study, first contribute to obtain information that can help the management in determining management policy decisions. Second, fast and accurate determination of working time standards can provide customers with answers about price and fast uptime. Third, calculating the standard time of completion of work helps to choose the best alternative working method with the principles and techniques of work measurement at PT Eka Sandang Duta Prima.       


Labour ◽  
2002 ◽  
Vol 16 (3) ◽  
pp. 557-568
Author(s):  
Petri Bockerman ◽  
Jaakko Kiander
Keyword(s):  

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