Addressing Operator Privacy in Automatic Dependent Surveillance - Broadcast (ADS-B)

We investigate security of ADS-B system and propose a framework composed of two solutions that would require minimal change to the existing system. The investigation focuses on providing an encrypted ADS-B system that provides confidentiality, availability, and integrity while requiring minimal changes to the existing ADS-B specification. The proposed framework consisting of two solutions is envisioned to be implemented through software updates while providing backwards compatibility. The most challenging requirement during this study was to work within the constraints of the existing ADS-B system

Dynamical Aspects in (4+1)-Body Problems

The n-body problem models a system of n-point masses that attract each other via some binary interaction. The (n + 1)-body problem assumes that one of the masses is located at the origin of the coordinate system. For example, an (n+1)-body problem is an ideal model for Saturn, seen as the central mass, and one of its outer rings. A relative equilibrium (RE) is a special solution of the (n+1)-body problem where the non-central bodies rotate rigidly about the centre of mass. In rotating coordinates, these solutions become equilibria. In this thesis we study dynamical aspects of planar (4 + 1)-body systems with the outer four of equal point mass interacting via a modified gravitational “J_2” attraction potential of the form: V (r) = −((m_i*m_j)/r)*(1 + ϵ/r^2), 0 \u3c ϵ \u3c\u3c 1 where r denotes the distance between masses m_i and m_j. Using the rotational symmetry as well as the symmetry induced by the mass equality, we are able to describe qualitatively the phase-space of square-shaped dynamics. We further analyze the existence of square-shaped RE and establish conditions necessary for their stability. We find that the RE appear as a saddle-node bifurcation. For a unit central mass and equal outer bodies of mass m, we find that these RE are unstable

IMPROVING THE ENVIRONMENTAL IMPACT OF DANISH CAR SHARING PROGRAMS

This project was sponsored by Danske Delebiler, an advisory board for Danish car sharing companies, to investigate incorporating high-efficiency, low-emissions vehicles (hybrid and alternative fuel cars) into car share fleets to reduce air pollution. Data from member surveys, focus groups, and interviews with car share managers revealed that members are conscious of environmental issues but prioritize low cost, convenience, and location. The project concludes that altering government vehicle tax policy is necessary to expand low-cost, environmentally friendly car share fleets

Branching on multi-aggregated variables

open5siopenGamrath, Gerald; Melchiori, Anna; Berthold, Timo; Gleixner, Ambros M.; Salvagnin, DomenicoGamrath, Gerald; Melchiori, Anna; Berthold, Timo; Gleixner, Ambros M.; Salvagnin, Domenic

2008 Formula SAE Racecar

This project involves the design, analysis, and manufacturing of a Formula SAE approved racecar with the intent of national competition. Through the division of the major vehicle components into the chassis, suspension, drive-train, controls, and aerodynamics, the project team effectively integrates each subsystem while considering performance, dependability, manufacturability, and cost. This project includes a detailed focus on the engineering of each subsystem; namely individual part designs, strength analysis, optimization techniques, process descriptions, and financial details. The project concludes with Formula SAE competition and submission of design and cost reports focused around the concept of real-world production of the vehicle

Cancellous bone and theropod dinosaur locomotion. Part I—an examination of cancellous bone architecture in the hindlimb bones of theropods

This paper is the first of a three-part series that investigates the architecture of cancellous (‘spongy’) bone in the main hindlimb bones of theropod dinosaurs, and uses cancellous bone architectural patterns to infer locomotor biomechanics in extinct non-avian species. Cancellous bone is widely known to be highly sensitive to its mechanical environment, and has previously been used to infer locomotor biomechanics in extinct tetrapod vertebrates, especially primates. Despite great promise, cancellous bone architecture has remained little utilized for investigating locomotion in many other extinct vertebrate groups, such as dinosaurs. Documentation and quantification of architectural patterns across a whole bone, and across multiple bones, can provide much information on cancellous bone architectural patterns and variation across species. Additionally, this also lends itself to analysis of the musculoskeletal biomechanical factors involved in a direct, mechanistic fashion. On this premise, computed tomographic and image analysis techniques were used to describe and analyse the three-dimensional architecture of cancellous bone in the main hindlimb bones of theropod dinosaurs for the first time. A comprehensive survey across many extant and extinct species is produced, identifying several patterns of similarity and contrast between groups. For instance, more stemward non-avian theropods (e.g. ceratosaurs and tyrannosaurids) exhibit cancellous bone architectures more comparable to that present in humans, whereas species more closely related to birds (e.g. paravians) exhibit architectural patterns bearing greater similarity to those of extant birds. Many of the observed patterns may be linked to particular aspects of locomotor biomechanics, such as the degree of hip or knee flexion during stance and gait. A further important observation is the abundance of markedly oblique trabeculae in the diaphyses of the femur and tibia of birds, which in large species produces spiralling patterns along the endosteal surface. Not only do these observations provide new insight into theropod anatomy and behaviour, they also provide the foundation for mechanistic testing of locomotor hypotheses via musculoskeletal biomechanical modelling