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Time in physics

Related publications (53)

Technically natural dark energy from Lorentz breaking

We construct a model of dark energy with a technically natural small contribution to cosmic acceleration, i.e. this contribution does not receive corrections from other scales in the theory. The proposed acceleration mechanism appears generically in the lo ...

2011

A 4.6-GHz, 15-mW frequency synthesizer CMOS ASIC with milli-hertz frequency resolution for miniature atomic clocks

Pierre-André Farine, Steve Tanner, Yazhou Zhao

In this paper, a 4.6 GHz frequency synthesizer integrated circuit for Cesium-based miniature atomic clocks is presented. Based on a fractional-N phase-locked loop (PLL) with sigma-delta modulator, the chip features a frequency resolution below 10E-3 Hz at ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2011

Mining Human Location-Routines Using a Multi-Level Approach to Topic Modeling

Daniel Gatica-Perez, Katayoun Farrahi

In this work we address the problem of modeling varying time duration sequences for large-scale human routine discovery from cellphone sensor data using a multi-level approach to probabilistic topic models. We use an unsupervised learning approach that dis ...

2010

Estimation of travel time on urban networks with midlink sources and sinks

André-Gilles Dumont, Edward Chung, Ashish Bhaskar

This paper presents a methodology for estimation of average travel time on signalized urban networks by integrating cumulative plots and probe data. This integration aims to reduce the relative deviations in the cumulative plots due to midlink sources and ...

National Academy of Sciences2009

Travel time estimation on urban networks with mid-link sources and sinks.

André-Gilles Dumont, Edward Chung, Ashish Bhaskar

A model for average travel time estimation on signalized urban networks by integrating cumulative plots with probe vehicle information is presented. The integration is performed with the aim to reduce the relative deviations in the cumulative plots occurre ...

2009

Short Term Travel Time Prediction Using Floating Car Data Based On Cluster Analysis

Precise short-term prediction of traffic parameters such as flow and travel-time is a necessary component for many ITS applications. This work describes the research on a novel, fast, and robust algorithm which is based on a partitioning cluster analysis. ...

2008

Multi-Layer Background Subtraction Based on Color and Texture

Jean-Marc Odobez

In this paper, we propose a robust multi-layer background subtraction technique which takes advantages of local texture features represented by local binary patterns (LBP) and photometric invariant color measurements in RGB color space. LBP can work robust ...

2007

Multi-Layer Background Subtraction Based on Color and Texture

Jean-Marc Odobez

Idiap2007

SARHA – Development of a Sensor-Augmented GPS/EGNOS/Galileo Receiver for Urban and Indoor Environments

Phillip Tomé, Okan Yalak

The main objective of the project ‘SARHA - Sensor-Augmented EGNOS/Galileo Receiver for Handheld Applications in Urban and Indoor Environments’ is the development of a modern satellite navigation receiver with autonomous sensor augmentation. Additionally, t ...

2007

Sensor-Augmented EGNOS/Galileo Receiver for Handheld Applications in Urban and Indoor Environments - SARHA

Phillip Tomé, Okan Yalak

In pedestrian user environments, like dense urban canyons or indoors, the GNSS positioning performance regarding accuracy and availability reaches well-known technological limits. These limitations can be overcome by adding additional sources of informatio ...

2006

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