Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"security screening"”.
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The origins of state security screening in Canada
Describing Canada's security intelligence practice, historians have identified 1945as a watershed. In September of that year Igor Gouzenko defected from the embassy of the Soviet Union in Ottawa, carrying with him evidence that the Soviets operated an espionage ring in this country. According to …
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Image Reconstruction for X-ray Computed Tomography in Security Screening Applications
… systems have increasingly widespread use in security screening applications. For example, most major airports now utilize X-ray CT</p> <p>systems for efficient screening of baggage and cargo. While decades of research has benefited CT for medical diagnostics, a number of practical differences …
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Applications of a hand-held optoelectronic nose: security screening, medical diagnosis and food inspection
… areas, including chemical toxin detection, security screening, food quality inspection, and health monitoring of general population. The use of colorimetric sensor arrays has proven to be a fast, convenient and effective method for liquid and gas analysis of relevant analytes where the …
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Analysis of Airport Security Screening Checkpoints using Queuing Networks and Discrete Event Simulation: A Theoretical and Empirical Approach
… effects of baggage volume and alarm rate at the Security Screening Checkpoint (SSCP) of a small origin and destination airport. A Jackson queuing network was considered for a theoretical assessment to SSCP performance. A DES model using Arena version 12 was utilized for an empirical approach. …
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A Step toward Ending Long Airport Security Lines: The Modified Boarding Pass
… by air has most likely experienced long airport security lines. Yet not much is known about its cause because few have considered if passengers have created this problem for themselves. The present study attempts to fill this research gap by suggesting that when passengers are not well-prepared …
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Effects of deceptive behavior on biomechanical measures of standing posture
… in many fields including credibility assessment, security screening, homeland security, and counter-terrorism. Techniques currently used for deception detection typically capitalize on deception-related physiological changes, and include polygraph testing, voice stress analysis, brain activity …
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Improving x-ray operator performance using virtual environments
… environments for explosive ordnance disposal and security screening. This includes the development of physics simulation package for generating and imaging x-rays which can be applied in interactive, realistic and variable training environments for operators.
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Operating characteristics of passenger screening processes and the development of a paced inspection system
The airport checkpoint security screening (ACSS) system is an important line of defense against the introduction of dangerous objects into the U.S. aviation system. Recently, there has been much interest in modeling these systems and to derive operating parameters which optimize performance. In …
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Deep Learning Neural Network-based Sinogram Interpolation for Sparse-View CT Reconstruction
… across domains like medical diagnosis, security screening, and scientific research. In medical imaging, CT allows physicians to diagnose injuries and disease more quickly and accurately than other imaging techniques. However, CT is one of the most significant contributors of radiation …
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Towards the development of an explosives detection system using Neutron Resonance Radiography
… explosives remains a challenge to air security, as indicated by recent reports detailing lapses in security screening and new requirements that mandate screening 100% of checked luggage. Neutron Resonance Radiography (NRR) has been under investigation as a supplement to conventional …
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Room-Temperature Terahertz Detection Based on Graphene and Plasmonic Antenna Arrays
… various applications, like biomedical imaging, security screening, and industrial quality control. The capability of these applications depends directly on the availability of powerful THz sources and high-responsivity, fast THz detectors. Current commercial products used to detect THz …
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Radio wave imaging using Ultra-Wide Band Spectrum Antennas for Near-Field Applications. Design, Development, and Measurements of Ultra-Wideband Antenna for Microwave Near-Field Imaging Applications by applying Optimisation Algorithms
… applications include military radar imaging, security screening, and tumour detection, especially for early detection of breast cancer. These indicators have stimulated and inspired many researchers to make the best use of this promising technology. UWB technology challenges such as antenna …
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Terahertz-Strahlung auf der Basis beschleunigter Ladungsträger in GaAs
… and microscopy, but it is also promising for security screening and even wireless communication. In the present thesis a planar photoconducting large-area THz radiation source is presented. The device exhibits outstanding properties, in particular high THz field strength and generation …
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Characterizing and mitigating scattering effects in terahertz time domain spectroscopy measurements.
… world applications such as biomedical sensing, security screening and defence related applications. While many researchers and commercial organizations have successfully demonstrated efficacy of terahertz, various challenges still exist before THz technology transitions from the realm of …
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Design and Implementation of High Efficiency, High Power Density Front-End Converter for High Voltage Capacitor Charger
… of accelerators to produce high power X-rays for security screening. Furthermore, the pulse power system has been applied for the tactical weapon system such as electrothermal-chemical (ETC) gun, coilgun and active armor system. Because the pulse power system applied for the tactical weapon system …
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Epitaxial growth and plasmonic coupling in topological insulator heterostructures
… TI a promising platform for far-IR sensing, security screening, and other optoelectronic devices that function in the THz. ☐ The epitaxial growth of chalcogenide TI family Bi2Se3, Bi2Te3, and Sb2Te3 is dominated by van der Waals epitaxy. To produce high quality thin film for optical …
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Antennas for Terahertz Applications: Focal Plane Arrays and On-chip Non-contact Measurement Probes
… inspection of packaged goods, and security screening. THz waves can penetrate most materials and can provide unique spectral information in the 0.1-10 THz band with high resolution. In contrast, other imaging modalities, like infrared (IR), suffer from low penetration depths and are …
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Analytical Modeling of Waveguide-fed Metasurfaces for Microwave Imaging and Beamforming
… images of buried objects, which is crucial in security screening and synthetic aperture radar (SAR). Traditionally, the hardware needed for many imaging techniques is cumbersome, including large arrays of antennas or bulky, moving parts. However, one attractive alternative to overcome these …
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Designing subwavelength-structured light sources
… control, chemical composition analysis, and security screening. Submillimeter spatial resolution imaging and incredibly specific molecular recognition are other compelling uses for terahertz radiation. To apply terahertz radiation beyond laboratory or close range (< 10 m) applications, more …
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Low Risk, High Threat, Open Access Security in a Post 9-11 World: A Study of the Smithsonian Institution's Office of Protection Services
… the U.S. government took many steps to enhance security to prevent future terrorist attacks. The emphasis on high threat targets by the Department of Homeland Security (DHS) and other government agencies, such as the White House, the Capitol and Congressional office buildings, major …