405. A Theoretical Work-Factor Blood-Lead Prediction Model for Construction Workers

2002 ◽  
Author(s):  
K. Vork ◽  
M. Nicas ◽  
S. Hammond
Keyword(s):  
Prediction Model ◽  
Blood Lead ◽  
Theoretical Work ◽  
Construction Workers ◽  
Work Factor

Selection of wearable sensor measurements for monitoring and managing entry-level construction worker fatigue: a logistic regression approach

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Wonil Lee ◽  
Ken-Yu Lin ◽  
Peter W. Johnson ◽  
Edmund Y.W. Seto
Keyword(s):  
Logistic Regression ◽  
Standard Deviation ◽  
Prediction Model ◽  
Material Handling ◽  
Construction Workers ◽  
Wearable Sensor ◽  
Content Type ◽  
Entry Level ◽  
Fatigue Management ◽  
Occupational Fatigue

PurposeThe identification of fatigue status and early intervention to mitigate fatigue can reduce the risk of workplace injuries. Off-the-shelf wearable sensors capable of assessing multiple parameters are available. However, using numerous variables in the fatigue prediction model can elicit data issues. This study aimed at identifying the most relevant variables for measuring occupational fatigue among entry-level construction workers by using common wearable sensor technologies, such as electrocardiogram and actigraphy sensors.Design/methodology/approachTwenty-two individuals were assigned different task workloads in repeated sessions. Stepwise logistic regression was used to identify the most parsimonious fatigue prediction model. Heart rate variability measurements, standard deviation of NN intervals and power in the low-frequency range (LF) were considered for fatigue prediction. Fast Fourier transform and autoregressive (AR) analysis were employed as frequency domain analysis methods.FindingsThe log-transformed LF obtained using AR analysis is preferred for daily fatigue management, whereas the standard deviation of normal-to-normal NN is useful in weekly fatigue management.Research limitations/implicationsThis study was conducted with entry-level construction workers who are involved in manual material handling activities. The findings of this study are applicable to this group.Originality/valueThis is the first study to investigate all major measures obtainable through electrocardiogram and actigraphy among current mainstream wearables for monitoring occupational fatigue in the construction industry. It contributes knowledge on the use of wearable technology for managing occupational fatigue among entry-level construction workers engaged in material handling activities.

A PILOT STUDY FOR FINDING WORK FACTOR-BLOOD LEAD RELATIONSHIPS IN CONSTUCTION WORKERS

Epidemiology ◽  
1998 ◽  
Vol 9 (Supplement) ◽  
pp. S114
Author(s):  
K. Vork ◽  
K Hammond ◽  
K Maurer ◽  
M Cullen
Keyword(s):  
Pilot Study ◽  
Blood Lead ◽  
Work Factor

scholarly journals Elevated blood lead levels in children of construction workers.

1997 ◽  
Vol 87 (8) ◽  
pp. 1352-1355 ◽  
Author(s):  
E A Whelan ◽  
G M Piacitelli ◽  
B Gerwel ◽  
T M Schnorr ◽  
C A Mueller ◽  
...  
Keyword(s):  
Blood Lead ◽  
Construction Workers ◽  
Blood Lead Levels ◽  
Elevated Blood ◽  
Lead Levels ◽  
Elevated Blood Lead Levels

Development of a probabilistic blood lead prediction model

1995 ◽  
Vol 17 (4) ◽  
pp. 169-181 ◽  
Author(s):  
Robert C. Lee ◽  
James R. Fricke ◽  
William E. Wright ◽  
Walt Haerer
Keyword(s):  
Prediction Model ◽  
Blood Lead

The O–C diagrams of minor planets − a new approach to modelling the rotation

1999 ◽  
Vol 173 ◽  
pp. 185-188
Author(s):  
Gy. Szabó ◽  
K. Sárneczky ◽  
L.L. Kiss
Keyword(s):  
Error Analysis ◽  
Time Dependence ◽  
Theoretical Work ◽  
Minor Planet ◽  
Minor Planets ◽  
New Approach ◽  
Preliminary Results ◽  
Ccd Observations

AbstractA widely used tool in studying quasi-monoperiodic processes is the O–C diagram. This paper deals with the application of this diagram in minor planet studies. The main difference between our approach and the classical O–C diagram is that we transform the epoch (=time) dependence into the geocentric longitude domain. We outline a rotation modelling using this modified O–C and illustrate the abilities with detailed error analysis. The primary assumption, that the monotonity and the shape of this diagram is (almost) independent of the geometry of the asteroids is discussed and tested. The monotonity enables an unambiguous distinction between the prograde and retrograde rotation, thus the four-fold (or in some cases the two-fold) ambiguities can be avoided. This turned out to be the main advantage of the O–C examination. As an extension to the theoretical work, we present some preliminary results on 1727 Mette based on new CCD observations.

Peculiarity Parameters

1976 ◽  
Vol 32 ◽  
pp. 233-254
Author(s):  
H. M. Maitzen
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Theoretical Work ◽  
Observational Evidence ◽  
Rotator Model ◽  
Peculiar Behaviour ◽  
Field Spectrum ◽  
Oblique Rotator ◽  
Ap Stars ◽  
The Way

Ap stars are peculiar in many aspects. During this century astronomers have been trying to collect data about these and have found a confusing variety of peculiar behaviour even from star to star that Struve stated in 1942 that at least we know that these phenomena are not supernatural. A real push to start deeper theoretical work on Ap stars was given by an additional observational evidence, namely the discovery of magnetic fields on these stars by Babcock (1947). This originated the concept that magnetic fields are the cause for spectroscopic and photometric peculiarities. Great leaps for the astronomical mankind were the Oblique Rotator model by Stibbs (1950) and Deutsch (1954), which by the way provided mathematical tools for the later handling pulsar geometries, anti the discovery of phase coincidence of the extrema of magnetic field, spectrum and photometric variations (e.g. Jarzebowski, 1960).

Electron holography of interfaces in electroceramics

1993 ◽  
Vol 51 ◽  
pp. 1088-1089
Author(s):  
Vinayak P. Dravid ◽  
V. Ravikumar ◽  
Richard Plass
Keyword(s):  
Space Charge ◽  
Direct Evidence ◽  
Materials Science ◽  
Theoretical Work ◽  
Electron Holography ◽  
Resolution Limit ◽  
Interference Phenomenon ◽  
X Ray ◽  
Electron Sources ◽  
Science Community

With the advent of coherent electron sources with cold field emission guns (cFEGs), it has become possible to utilize the coherent interference phenomenon and perform “practical” electron holography. Historically, holography was envisioned to extent the resolution limit by compensating coherent aberrations. Indeed such work has been done with reasonable success in a few laboratories around the world. However, it is the ability of electron holography to map electrical and magnetic fields which has caught considerable attention of materials science community.There has been considerable theoretical work on formation of space charge on surfaces and internal interfaces. In particular, formation and nature of space charge have important implications for the performance of numerous electroceramics which derive their useful properties from electrically active grain boundaries. Bonnell and coworkers, in their elegant STM experiments provided the direct evidence for GB space charge and its sign, while Chiang et al. used the indirect but powerful technique of x-ray microchemical profiling across GBs to infer the nature of space charge.

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