The Determination of Optimal Work Start Time

2004 ◽  
Author(s):  
Shu-Guang Li
Keyword(s):  
Start Time

Determination of the Proper Rest Time for a Cyclic Mental Task Using ACT-R Architecture

2016 ◽  
Vol 59 (2) ◽  
pp. 299-313 ◽  
Author(s):  
Nooshin Atashfeshan ◽  
Hamideh Razavi
Keyword(s):  
Response Time ◽  
Error Rate ◽  
Individual Performance ◽  
Mental Fatigue ◽  
Design Phase ◽  
Mental Task ◽  
Start Time ◽  
Operator Performance ◽  
Rest Breaks

Objective Analysis of the effect of mental fatigue on a cognitive task and determination of the right start time for rest breaks in work environments. Background Mental fatigue has been recognized as one of the most important factors influencing individual performance. Subjective and physiological measures are popular methods for analyzing fatigue, but they are restricted to physical experiments. Computational cognitive models are useful for predicting operator performance and can be used for analyzing fatigue in the design phase, particularly in industrial operations and inspections where cognitive tasks are frequent and the effects of mental fatigue are crucial. Method A cyclic mental task is modeled by the ACT-R architecture, and the effect of mental fatigue on response time and error rate is studied. The task includes visual inspections in a production line or control workstation where an operator has to check products’ conformity to specifications. Initially, simulated and experimental results are compared using correlation coefficients and paired t test statistics. After validation of the model, the effects are studied by human and simulated results, which are obtained by running 50-minute tests. Results It is revealed that during the last 20 minutes of the tests, the response time increased by 20%, and during the last 12.5 minutes, the error rate increased by 7% on average. Conclusion The proper start time for the rest period can be identified by setting a limit on the error rate or response time. Application The proposed model can be applied early in production planning to decrease the negative effects of mental fatigue by predicting the operator performance. It can also be used for determining the rest breaks in the design phase without an operator in the loop.

Determination of event start time at BESIII

2008 ◽  
Vol 32 (9) ◽  
pp. 744-749 ◽  
Author(s):  
Ma Xiang ◽  
Mao Ze-Pu ◽  
Bian Jian-Ming ◽  
Cao Guo-Fu ◽  
Cao Xue-Xiang ◽  
...  
Keyword(s):  
Start Time

Determination of defrosting start time in an air-to-air heat pump system by frost volume calculation method

2018 ◽  
Vol 96 ◽  
pp. 169-178 ◽  
Author(s):  
Jin Woo Yoo ◽  
Yoong Chung ◽  
Gwi Taek Kim ◽  
Chi Woo Song ◽  
Pil Hyun Yoon ◽  
...  
Keyword(s):  
Heat Pump ◽  
Calculation Method ◽  
Start Time ◽  
Pump System ◽  
Volume Calculation ◽  
Heat Pump System

scholarly journals WAKTU SHALAT PERSPEKTIF SYAR‘I

Asy-Syari ah ◽  
2014 ◽  
Vol 17 (1) ◽  
Author(s):  
Tamhid Amri
Keyword(s):  
Start Time ◽  
Modern Times ◽  
Naturally Occurring ◽  
Predetermined Time

Prayer is one of the obligations of a believer to his God, prayer has various virtues and wis­dom, both in terms of religious, psychological, and social. Thus, prayer is the most important worship in Islam. In carrying out prayer, Muslims should not be carelessly, it is because prayer is worship predetermined time and how. In modern times, we are not going to be difficult in knowing the prayer time because many Islamic organi­za­tions, even governments make prayer schedule as a reference in the salat. Never­theless, we need to know the time of prayer based on a naturally occurring pheno­me­non, so that our knowledge is more comprehensive. In its implementation, some scho­lars have the same opinion in the interpretation of the hadith about prayer ti­mings exemplified by the Prophet. But there are also some scholars have different opi­nions about the interpretation for the determination of some prayer time. As an example the opinion of Imam Shafi'i and Imam Hanafi about the start time of Asr and Isha prayer which different opinions in the interpretation of the hadith of the Prophet Muhammad.

scholarly journals DETERMINATION OF OPTIMAL WORK START TIME

Transport ◽  
2007 ◽  
Vol 22 (1) ◽  
pp. 45-49 ◽  
Author(s):  
Shu-Guang Li
Keyword(s):  
Travel Time ◽  
Travel Cost ◽  
Decision Variable ◽  
Stochastic Dynamic ◽  
Start Time ◽  
Departure Time ◽  
Level Model ◽  
Upper Level ◽  
Two Level Model

The question is: whether the system total travel cost and travel time are reduced by adjusting the work start time or not? This paper proposes the two‐level model for answering the question; the upper‐level minimizes the system travel cost and travel time by using the work start time as a decision variable, the lower‐level models the stochastic dynamic simultaneous route/departure time equilibrium problem. Finally, numerical results of a small network are provided to illustrate the behavior of the model.

Variable neighborhood search for integrated determination of charge batching and casting start time in steel plants

2018 ◽  
Vol 34 (6) ◽  
pp. 3821-3832 ◽  
Author(s):  
Jianyu Long ◽  
Zhenzhong Sun ◽  
Haibin Chen ◽  
Yun Bai ◽  
Ying Hong
Keyword(s):  
Variable Neighborhood Search ◽  
Neighborhood Search ◽  
Start Time

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

International determination of the total motion of the pole

1961 ◽  
Vol 13 ◽  
pp. 29-41
Author(s):  
Wm. Markowitz
Keyword(s):  
Secular Motion ◽  
The Future

A symposium on the future of the International Latitude Service (I. L. S.) is to be held in Helsinki in July 1960. My report for the symposium consists of two parts. Part I, denoded (Mk I) was published [1] earlier in 1960 under the title “Latitude and Longitude, and the Secular Motion of the Pole”. Part II is the present paper, denoded (Mk II).

Time and Latitude in South Africa

1972 ◽  
Vol 1 ◽  
pp. 27-38
Author(s):  
J. Hers
Keyword(s):  
South Africa ◽  
Cape Town ◽  
Astronomical Observations ◽  
Royal Observatory ◽  
The Republic ◽  
Astronomical Determination ◽  
Limited Accuracy ◽  
Better Than

In South Africa the modern outlook towards time may be said to have started in 1948. Both the two major observatories, The Royal Observatory in Cape Town and the Union Observatory (now known as the Republic Observatory) in Johannesburg had, of course, been involved in the astronomical determination of time almost from their inception, and the Johannesburg Observatory has been responsible for the official time of South Africa since 1908. However the pendulum clocks then in use could not be relied on to provide an accuracy better than about 1/10 second, which was of the same order as that of the astronomical observations. It is doubtful if much use was made of even this limited accuracy outside the two observatories, and although there may – occasionally have been a demand for more accurate time, it was certainly not voiced.

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