Chaos in Extended Linear Arrays of Josephson Weak Links

Extended linear arrays of interacting Josephson weak links are studied by numerical simulation using the resistively shunted junction model. The minimum coupling strength for chaotic behavior is determined as a function of the number of links. This strength is found to diminish steadily with increasing number, despite the inclusion of only nearest-neighbor interaction. The implications for Josephson technology are briefly discussed. Mathematically, the results are a confirmation of the Ruelle-Takens scenario for chaos

A Study of Rootkit Stealth Techniques and Associated Detection Methods

In today\u27s world of advanced computing power at the fingertips of any user, we must constantly think of computer security. Information is power and this power is had within our computer systems. If we cannot trust the information within our computer systems then we cannot properly wield the power that comes from such information. Rootkits are software programs that are designed to develop and maintain an environment in which malware may hide on a computer system after successful compromise of that computer system. Rootkits cut at the very foundation of the trust that we put in our information and subsequent power. This thesis seeks to understand rootkit hiding techniques, rootkit finding techniques and develops attack trees and defense trees in order to help us identify deficiencies in detection to further increase the trust in our information systems

A Full-Scale Evaluation of Lightweight Personal Protective Ensembles for Demining in Providing Protection Against Blast-Type Anti-Personnel Mines

A wide range of equipment, in the form of helmets, vests, aprons and trousers, is currently in use around the world to protect deminers against the effects of AP mines. Significant variations exist in terms of the level of protection afforded, operational usefulness, quality of manufacturing and cost of each of these components. To date, there have been limited studies undertaken to systematically and quantitatively assess the effectiveness of the different protective components applied to both the civilian and military demining theaters. This study summarizes the efforts of numerous full-scale test series carried out in 1999, with particular emphasis on quantifying the protective performance against blast AP mines of selected concepts of humanitarian demining ensembles. It was also possible to assess aspects of the blast and related fragmentation resistance of individual components

Mutual Voltage Locking in Linear Arrays of Josephson Weak Links

A linear array of superconducting weak links with a common bias current can exhibit synchronization provided there is nearest-neighbor coupling between the links. A perturbation method is applied to the equations governing this system, and the results indicate how the domain of locking depends on various parameters. Numerical simulations confirm the predicted behavior

Self-Resonance in Cylindrical Josephson Junctions

The I-V characteristics of self-resonant cylindrical Josephson junctions in the presence of parallel applied magnetic fields have been calculated using a first-order perturbation technique

The Effectiveness of Different Personal Protective Ensembles in Preventing Injury to the Thorax from Blast-Type Anti-Personnel Mines

It is well established from numerous documented cases of bomb blasts that, under certain conditions (determined by the amount and proximity of explosive), the transmitted shock wave and associated overpressure generated by the detonation of an explosive device can cause critical and fatal injuries to the thorax, e.g., “blast lung.” As such injuries tend to be internal and thus difficult to detect, there has been considerable debate in recent years on the significance of the blast overpressure injury in the context of demining/mine clearance compared to more visible injuries, such as, amputation of extremities, fragmentation wounds and blindness. A wide range of personal protective ensembles are currently deployed in the field, incorporating disparate stackings of materials over the thoracic region

PPE: Effective Protection for Deminers

This article briefly explains the work that Med-Eng Systems, Inc., has done on personal protective equipment (PPE) over the past few years