Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 4 of 4
Full-Text Articles in Entire DC Network
Adding Liveness Detection To The Hand Geometry Scanner, Musat C. Crihalmeanu
Adding Liveness Detection To The Hand Geometry Scanner, Musat C. Crihalmeanu
Graduate Theses, Dissertations, and Problem Reports
In today's dynamic society, the efficiency of the Biometric Systems has an increasing tendency to replace the classic but obsolete keys and passwords. Hand Geometry Readers are popular biometrics used for Access and Control applications. One of their weaknesses is vulnerability to spoofing using fake hands (latex, play-doh or dead-hands).;The objective of this thesis is to design a feature to be added to the Hand Geometry Scanner in order to detect vitality in the hand, reducing spoofing possibilities.;This thesis demonstrates how the Hand Reader was successfully spoofed and shows the implementation of the live detection feature through an inexpensive but …
Bone Fracture Toughness Of Estrogen Deficient Rabbits, Matthew S. Smith
Bone Fracture Toughness Of Estrogen Deficient Rabbits, Matthew S. Smith
Graduate Theses, Dissertations, and Problem Reports
Bone mass is commonly used as an indicator of fracture risk. It has been shown in numerous studies that bone loss causes increased bone fragility and risk of fracture. It has also been shown that 50% of patients with osteoporotic vertebral compression fractures have the same bone mass as normal age matched controls. Thus, bone mass alone is not the only indicator of bone quality and ability to resist fracture.;The objective of this study was to qualitatively assess bone's mechanical and histomorphometric changes with drug treatment, and estrogen deficiency, using fracture toughness, femoral neck fracture and histomorphometric analysis in an …
Finite Element Analysis Of Cell Subjected To Compressive Loading, Vidhyashankar Venkatesan
Finite Element Analysis Of Cell Subjected To Compressive Loading, Vidhyashankar Venkatesan
Graduate Theses, Dissertations, and Problem Reports
A 3D finite element model was built to study the mechanical response of the cell to load. The model included major structural components of a cell like cytoskeletal elements, cell membrane and the presence of internal fluid pressure. The cell was considered as a pressurized, fluid filled bag where inflation of the cell membrane is resisted by the cytoskeletal elements. The behavior of the cell model with microtubules prone to buckling and stabilized by actin filaments was also studied.;A point load was applied to a microtubule in a cell model with there buckling effect taken into consideration. The microtubule started …
Inhalation Exposure System For Diesel Exhaust Particulates, Jay Michael Sherman
Inhalation Exposure System For Diesel Exhaust Particulates, Jay Michael Sherman
Graduate Theses, Dissertations, and Problem Reports
The objectives of this research were twofold. First, a Hazelton 2000 Inhalation Chamber was modified to minimize the amount of diesel exhaust particulate (DEP) needed for animal inhalation exposures. Second, instrumentation was evaluated for aerosolizing DEP, monitoring the mass concentration and size distribution, and determining the uniformity of the aerosol.;The Jet-O-Mizer jet mill produced a single mode DEP mass median diameter (MMD) of 0.33 mum while maintaining a relatively steady mass concentration of 10 mg/m3. The uniformity of a carbon black aerosol was found to vary from 9.9 mg/m3 in the front part of the chamber, to 10.4 mg/m3 in …