The Option of Posted Price Selling for a Seller with Multiple Units

2010 ◽  
Author(s):  
Mingli Zheng
Keyword(s):  
Multiple Units ◽  
Posted Price

scholarly journals Improved Revenue Bounds for Posted-Price and Second-Price Mechanisms

2021 ◽  
Author(s):  
Hedyeh Beyhaghi ◽  
Negin Golrezaei ◽  
Renato Paes Leme ◽  
Martin Pál ◽  
Balasubramanian Sivan
Keyword(s):  
The Other ◽  
Uniform Price ◽  
Optimal Mechanism ◽  
Pricing Rules ◽  
Multiple Units ◽  
Posted Price

How to optimize posted price mechanisms? The sequential posted-price (SPP) mechanism is one of the widely used selling mechanisms in practice. In this mechanism, the seller presents each buyer with a price sequentially and the buyer can either accept or reject the mechanism's offer. Despite the widespread use of the SPP mechanism, the problem of optimizing prices in this mechanism has not been fully addressed. In a paper entitled, “Improved Revenue Bounds for Posted-Price and Second-Price Mechanisms,” H. Beyhaghi, N. Golrezaei, R. Paes Leme, M. Pal, and B. Sivan construct SPP mechanisms by considering the best of two simple pricing rules: one that imitates the optimal mechanism and the other that posts a uniform price (same price for every buyer). Their simple pricing rules can be easily generalized to the setting with multiple units and yield the first improvement over long-established approximation factors.

Brakes along the Line

1992 ◽  
Vol 206 (2) ◽  
pp. 79-91
Author(s):  
M J Leigh
Keyword(s):  
United Kingdom ◽  
Automobile Industry ◽  
Engineering Profession ◽  
The United Kingdom ◽  
Multiple Units

The Railway Division Chairman reviews his career in railway braking with Davies and Metcalfe, including his apprenticeship in the automobile industry. He outlines his involvement with various multiple units in the United Kingdom and Australia, discussing the brake blending with its possibilities. The outcome of locomotive brake competition in the direct release market is described and the advantages of two-pipe brake systems for both direct and graduable braking are highlighted. He concludes by mentioning training and the engineering profession.

Selling multiple units to strategic consumers

2021 ◽  
Vol 49 (2) ◽  
pp. 191-196
Author(s):  
Chen Jin ◽  
Qian Liu ◽  
Chenguang (Allen) Wu
Keyword(s):  
Strategic Consumers ◽  
Multiple Units

Testing whether implicit emotion regulation mediates the association between discrimination and symptoms of psychopathology in late childhood: An RDoC perspective

2021 ◽  
pp. 1-14
Author(s):  
T.G. Vargas ◽  
V.A. Mittal
Keyword(s):  
Working Memory ◽  
Emotion Regulation ◽  
Depressive Symptoms ◽  
Inhibitory Control ◽  
Memory Performance ◽  
Neurocognitive Functions ◽  
Units Of Analysis ◽  
Race Ethnicity ◽  
Implicit Emotion Regulation ◽  
Multiple Units

Abstract Discrimination has been associated with adverse mental health outcomes, though it is unclear how early in life this association becomes apparent. Implicit emotion regulation, developing during childhood, is a foundational skill tied to a range of outcomes. Implicit emotion regulation has yet to be tested as an associated process for mental illness symptoms that can often emerge during this sensitive developmental period. Youth aged 9–11 were recruited for the Adolescent Brain Cognitive Development (ABCD) study. Associations between psychotic-like experiences, depressive symptoms, and total discrimination (due to race, ethnicity, nationality, weight, or sexual minority status) were tested, as well as associations with implicit emotion regulation measures (emotional updating working memory and inhibitory control). Analyses examined whether associations with symptoms were mediated by implicit emotion regulation. Discrimination related to decreased implicit emotion regulation performance, and increased endorsement of depressive symptoms and psychotic-like experiences. Emotional updating working memory performance partially mediated the association between discrimination and psychotic-like experiences, while emotional inhibitory control did not. Discrimination and implicit emotion regulation could serve as putative transdiagnostic markers of vulnerability. Results support the utility of using multiple units of analysis to improve understanding of complex emerging neurocognitive functions and developmentally sensitive periods.

scholarly journals Identification of the Major Noise Energy Sources in Rail Vehicles Moving at a Speed of 200 km/h

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3957
Author(s):  
Krzysztof Polak ◽  
Jarosław Korzeb
Keyword(s):  
Experimental Research ◽  
Energy Sources ◽  
Dominant Source ◽  
Railway Vehicles ◽  
Measurement Apparatus ◽  
Rail Vehicles ◽  
Noise Energy ◽  
Rolling Noise ◽  
Multiple Units

In this work, the problematic identification of the main sources of noise occurring from the exploitation of railway vehicles moving at a speed of 200 km/h were analyzed. Within the conducted experimental research, the testing fields were appointed, measurement apparatus selected, and a methodology for conducting measurements was defined, including the assessment of noise on a curve and straight track for electric multiple units of the so-called Pendolino, an Alstom type ETR610 series ED25 train. The measurements were made using a microphone camera Bionic S-112 at a distance of 22 m from the track axis. As a result of the conducted experimental research, it was indicated that the noise resulting from vibrations arising at the wheel-rail contact (rolling noise) was the dominant source of sound.

scholarly journals Characterisation and Control of a Woven Biomimetic Actuator for Wearable Neurorehabilitative Devices

Actuators ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 37
Author(s):  
Vaughan Murphy ◽  
Brandon P. R. Edmonds ◽  
Ana Luisa Trejos
Keyword(s):  
Performance Metrics ◽  
Woven Fabric ◽  
Total Force ◽  
Control Methods ◽  
Soft Actuator ◽  
Sewing Thread ◽  
And Control ◽  
Fabric Mesh ◽  
Biomimetic Actuator ◽  
Multiple Units

Twisted coiled actuators (TCAs) are a type of soft actuator made from polymer fibres such as nylon sewing thread. As they provide motion in a compact, lightweight, and flexible package, they provide a solution to the actuation of wearable mechatronic devices for motion assistance. Their limitation is that they provide low total force, requiring them to actuate in parallel with multiple units. Previous literature has shown that the force and stroke production can be improved by incorporating them into fabric meshes. A fabric mesh could also improve the contraction efficiency, strain rate, and user comfort. Therefore, this study focused on measuring these performance metrics for a set of TCAs embedded into a woven fabric mesh. The experimental results show that the stroke of the actuators scaled linearly with the number of activated TCAs, achieving a maximum applied force of 11.28 N, a maximum stroke of 12.23%, and an efficiency of 1.8%. Additionally, two control methods were developed and evaluated, resulting in low overshoot and steady-state error. These results indicate that the designed actuators are viable for use in wearable mechatronic devices, since they can scale to meet different requirements, while being able to be accurately controlled with minimal additional components.

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