10,969 research outputs found
Karner Blue Butterfly: A Symbol of a Vanishing Landscape
No full textAndow, David A.; Baker, Richard J.; Lane, Cynthia P. (1994). Karner Blue Butterfly: A Symbol of a Vanishing Landscape. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/192310
Lane Closure Policy Development, Enforcement, and Exceptions: A Survey of Seven State Transportation Agencies, February 2007
No full textTraffic volume increases and an aging infrastructure create the need for reconstruction, rehabilitation, and maintenance of existing facilities. As more motorists feel that delays should be minimal during highway renewal projects, lane closures that reduce capacity through the work zone should not create unreasonable delays. In order to facilitate the determination of when a lane closure is permitted during the day, some state transportation agencies (STAs) have developed lane closure policies, or strategies, that they use as guidance in determining daily permitted lane closure times. Permitted lane closure times define what times of the day, week, or season a lane closure is allowed on a facility and at a specific location or segment. This research addresses the lane closure policies of several STAs that were reputed to have good lane closures policies or strategies and that were selected by the project advisory committee for further research
Chi Square
No full textThis resource, created by author David M. Lane, defines and explains Chi square. It takes the user through 5 different categories: testing differences between p and pi, more than two categories, chi-square test of independence, reporting results, exercises. This basic resource provides students with a much greater understanding of this testing process. Overall, it would be good for any statistics classroom
Toolbox of Countermeasures for Rural Two-Lane Curves, June 2012
No full textThe Federal Highway Administration (FHWA) estimates that 58 percent of roadway fatalities are lane departures, while 40 percent of fatalities are single-vehicle run-off-road (SVROR) crashes. Addressing lane-departure crashes is therefore a priority for national, state, and local roadway agencies. Horizontal curves are of particular interest because they have been correlated with increased crash occurrence.
This toolbox was developed to assist agencies address crashes at rural curves. The main objective of this toolbox is to summarize the effectiveness of various known curve countermeasures.
While education, enforcement, and policy countermeasures should also be considered, they were not included given the toolbox focuses on roadway-based countermeasures. Furthermore, the toolbox is geared toward rural two-lane curves.
The research team identified countermeasures based on their own research, through a survey of the literature, and through discussions with other professionals. Coverage of curve countermeasures in this toolbox is not necessarily comprehensive.
For each countermeasure covered, this toolbox includes the following information: description, application, effectiveness, advantages, and disadvantages
Inter- and intra-driver variability in lane change behaviour
No full textLane change manoeuvres are known to vary widely in lane change duration. This is thought to be an effect of the surrounding vehicles and personal preference of drivers. However, little is known about the effect on steering behaviour during a lane change manoeuvre. Moreover, the relation of the effect of traffic to inter- and intra-driver variability is unknown. This study focuses on quantifying inter- and intra-driver variability in lane change duration and steering behaviour during lane changes in two different traffic scenarios. In an exploratory study, 21 participants drove 30 lane change manoeuvres in a 6 DoF moving base driving simulator. Two scenarios were used: a closing gap in the target lane and a constant gap in the target lane, with 15 repetitions per scenario. The results show high inter-driver and intra-driver variability, for both lane change duration (M=6.34 s SD-inter=0.90 s SD-intra=1.26 s) and steering behaviour (e.g. maximum steering wheel angle M=4.14 deg SD-inter=1.62 deg SD-intra=1.34 deg). The effect of the scenario was not significant for lane change duration and maximum steering wheel angles. Additionally, it was shown that lane change duration only has a medium correlation with the maximum steering wheel angle (Pearson R(585)=-.48, p\textless0.001). Furthermore, the mean and variability of the lane change duration decreased when lane changes were initiated with a shorter distance to the slow lead vehicle. Concluding, the lane change duration does not fully determine steering behaviour during a lane change, making it an unsuitable metric for determining human-like lane change trajectories. It is therefore proposed to create trajectories based on steering behaviour. It seems that drivers exhibit high variability in lane change behaviour when spatio-temporal criticality with respect to traffic is low. Higher spatio-temporal criticality limits the mean and variability of the lane change duration. Future work should determine whether this variability is the result of driver preference or indifference. Additionally, future work should implement and test human-like lane change trajectories based on steering behaviour as opposed to lane change duration.Mechanical Engineering | Vehicle Engineerin
Toolbox of Countermeasures for Rural Two-Lane Curves [updated], TR-579, October 2013
No full textThe Federal Highway Administration (FHWA) estimates that 58 percent of roadway fatalities are lane departures, while 40 percent of fatalities are single-vehicle run-off-road (SVROR) crashes. Addressing lane-departure crashes is therefore a priority for national, state, and local roadway agencies. Horizontal curves are of particular interest because they have been correlated with increased crash occurrence.
This toolbox was developed to assist agencies address crashes at rural curves. The main objective of this toolbox is to summarize the effectiveness of various known curve countermeasures.
While education, enforcement, and policy countermeasures should also be considered, they were not included given the toolbox focuses on roadway-based countermeasures. Furthermore, the toolbox is geared toward rural two-lane curves.
The research team identified countermeasures based on their own research, through a survey of the literature, and through discussions with other professionals. Coverage of curve countermeasures in this toolbox is not necessarily comprehensive.
For each countermeasure covered, this toolbox includes the following information: description, application, effectiveness, advantages, and disadvantages
Eurydice. A tragedy. Acted at the Theatre-Royal in Drury-Lane, by His Majesty's servants.
No full textCited by G. W. Bergquist, p. 165, as first edition.Mode of access: Internet.Clark Library copy: 21 cm.; bound in marbled boards.Copy 2 bound with: Alfred : a masque, acted at the Theatre-Royal in Drury-Lane by His Majesty's servants / David Mallet. London : Millar, 1751
Applying hierarchical task analysis to medication administration errors
No full textMedication use in hospitals is a complex process and is dependent on the successful interaction of health professionals functioning within different disciplines. Errors can occur at any one of the five main stages of prescribing, documenting, dispensing or preparation, administering and monitoring. The responsibility for the error is often placed on the nurse, as she or he is the last person in the drug administration chain whilst more pressing underlying causal factors remain unresolved.
This paper demonstrates how hierarchical task analysis can be used to model drug administration and then uses the systematic human error reduction and prediction approach to predict which errors are likely to occur. The paper also puts forward design solutions to mitigate these errors
The Interprocedural Express-lane Transformation
No full textThe express-lane transformation isolates and duplicates frequently executed program paths, aiming for better data-flow facts along the duplicated paths. An express-lane p is a copy of a frequently executed program path such that p has only one entry point at its beginning; p may have branches back to the original code, but the original code never branches into p. Classical data-flow analysis is likely to find sharper data-flow facts along an express-lane, because there are no join points
On the improvement of the rifle, as a weapon for general use / by Lieut.-Colonel Lane-Fox, Grenadier Guards.
No full text'Read at the United Service Institution, on 14th June, 1858, Colonel the Hon. James Lindsay in the Chair' - t.p.; Signatures: B2, C2, D2; Electronic reproduction. Canberra, A.C.T. : National Library of Australia, 2011.; Library copy has marks in margins and signature on title page. "A brief account of the history of the rifle and of the experiemnets and trials which have accompanied its introduction into the English Army.The remarks ... are principally from a private journal which I [author] had kept during the course of experiements in which I [author] have been engaged at Woolwich, Enfield, Hythe and Malta, during the six years, commencing in 1851 and ending in 1857." -- [p.3]
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