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Displaying Results 10751 - 10754 of 10754 on page 431 of 431

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Zero-pad Effects on Conditional Simulation and Application of Spatially-varying Earthquake Motions (2012)

BASU, BISWAJIT; NGUYEN, DINH VAN

Zero-pad Effects on Conditional Simulation and Application of Spatially-varying Earthquake Motions (2012)

BASU, BISWAJIT; NGUYEN, DINH VAN

Abstract:

Realistic simulated ground motion are required for testing heath monitoring algorithms in connection with seismic excitations. To this end spatially-varying ground motions are important for long span structures such as bridges and pipelines. In conditional simulation of spatially-varying earthquake motions, a single earthquake motion time history at a site is known and a parametric coherency model is given. Spatially-varying earthquake motions at other sites are then simulated. To facilitate the use of the Fast Fourier Transform (FFT), dummy zero points must be added to the front and/or the end of the data. Investigating effects of zero-pad is important for simulating ground motions to be used for testing health monitoring techniques. However, neither comparison of zero-padded filtered data with non-zero pad filtered data nor explanation for effects of zero pads have been reported. The zero-pad effects on FFT of the input motion and also on the simulated motions are examined in this...

http://hdl.handle.net/2262/67179

Marked Mark

Zero is not a Four Letter Word: Studies in the Evolution of Language (2005)

Stephens, Christopher R.; Nicolau, Miguel; Ryan, Conor

Zero is not a Four Letter Word: Studies in the Evolution of Language (2005)

Stephens, Christopher R.; Nicolau, Miguel; Ryan, Conor

Abstract:

We examine a model genetic system that has features of both genetic programming and genetic regulatory networks, to show how various forms of degeneracy in the genotype-phenotype map can induce complex and subtle behaviour in the dynamics that lead to enhanced evolutionary robustness and can be fruitfully described in terms of an elementary algorithmic 'language'.

http://hdl.handle.net/10197/8275

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ZhiWo: Activity tagging and recognizing system from personal lifelogs (2013)

Zhou, Lijuan Marissa; Gurrin, Cathal; Qiu, Zhengwei

ZhiWo: Activity tagging and recognizing system from personal lifelogs (2013)

Zhou, Lijuan Marissa; Gurrin, Cathal; Qiu, Zhengwei

Abstract:

With the increasing use of mobile devices as personal record- ing, communication and sensing tools, extracting the seman- tics of life activities through sensed data (photos, accelerom- eter, GPS etc.) is gaining widespread public awareness. A person who engages in long-term personal sensing is engag- ing in a process of lifelogging. Lifelogging typically involves using a range of (wearable) sensors to capture raw data, to segment into discrete activities, to annotate and subse- quently to make accessible by search or browsing tools. In this paper, we present an intuitive lifelog activity record- ing and management system called ZhiWo. By using a su- pervised machine learning approach, sensed data collected by mobile devices are automatically classified into different types of daily human activities and these activities are inter- preted as life activity retrieval units for personal archives.

http://doras.dcu.ie/17846/

Marked Mark

γ-Radiation dosimetry using screen printed nickel oxide thick films (2002)

Arshak, Khalil; Korostynska, Olga; Harris, John A.

γ-Radiation dosimetry using screen printed nickel oxide thick films (2002)

Arshak, Khalil; Korostynska, Olga; Harris, John A.

Abstract:

Thick films of Nickel oxide (NiO) were investigated for γ-radiation dosimetry purposes. Samples were fabricated using the thick film screen printing technique. Absorption spectra for NiO films were recorded and the values of the optical band gap for as-printed, irradiated and annealed films were calculated. It was found that the optical band gap value decreased as the radiation dose was increased. Samples with an Ag-NiO-Ag sandwich structure were exposed to a 60Co γ-radiation source at a dose rate of 6 Gy/min. The relative change in current increased linearly with increased dosage up to 720 Gy. The I-V characteristics indicated a Poole-Frenkel conduction mechanism. It was found that annealing restored both the electrical and the optical properties of the samples.
EI

http://hdl.handle.net/10344/1048

Displaying Results 10751 - 10754 of 10754 on page 431 of 431