Trojan

About: Trojan is a research topic. Over the lifetime, 2028 publications have been published within this topic receiving 33209 citations.

Trojan Females and Judas Goats: Evolutionary Traps as Tools in Wildlife Management

Abstract: Evolutionary traps occur when rapid environmental change causes animals to prefer poor-quality resources (e.g., habitats) or behaviors over higher-quality ones that lead to greater survival or reproductive success. Here, we bring together science from the pest-control, eco-evolutionary, and conservation communities to outline how evolutionary traps can be repurposed to eliminate or control pest species. We highlight case studies and devise strategies for the selection of appropriate cues to manipulate, traits to target, and mechanisms to use in setting evolutionary traps that will most rapidly reduce animal abundance while preventing evolutionary escape. Approaches to setting evolutionary traps have been diverse but uneven with respect to principles that would make them more effective, such as strengthening resource preference, triggering out-of-context behaviors, and targeting underexploited sensory modalities. We find that evolutionary traps are demonstrably effective and unique tools with high target-species specificity that are deployable in concert with more traditional approaches.

Analysis of the Trojan Y-Chromosome eradication strategy for an invasive species

Abstract: The Trojan Y-Chromosome (TYC) strategy, an autocidal genetic biocontrol method, has been proposed to eliminate invasive alien species. In this work, we analyze the dynamical system model of the TYC strategy, with the aim of studying the viability of the TYC eradication and control strategy of an invasive species. In particular, because the constant introduction of sex-reversed trojan females for all time is not possible in practice, there arises the question: What happens if this injection is stopped after some time? Can the invasive species recover? To answer that question, we perform a rigorous bifurcation analysis and study the basin of attraction of the recovery state and the extinction state in both the full model and a certain reduced model. In particular, we find a theoretical condition for the eradication strategy to work. Additionally, the consideration of an Allee effect and the possibility of a Turing instability are also studied in this work. Our results show that: (1) with the inclusion of an Allee effect, the number of the invasive females is not required to be very low when the introduction of the sex-reversed trojan females is stopped, and the remaining Trojan Y-Chromosome population is sufficient to induce extinction of the invasive females; (2) incorporating diffusive spatial spread does not produce a Turing instability, which would have suggested that the TYC eradication strategy might be only partially effective, leaving a patchy distribution of the invasive species.

FPGA Trojan Detection Using Length-Optimized Ring Oscillators

Abstract: Hardware Trojan horses are a realistic threat for both ASIC and FPGA systems. Ring Oscillators (ROs) can be used to detect the presence of malicious hardware functionality. The length of an RO is a significant parameter for detecting efficiently malicious logic (sensitivity) while maintaining a low space and power profile. We explore through simulation the effect of the RO length on detecting different classes of Trojan horses on an FPGA.

Lucy: Surveying the Diversity of the Trojan Asteroids, the Fossils of Planet Formation

Abstract: Mission Overview: The Lucy mission is the first reconnaissance of the Jupiter Trojan asteroids objects that hold vital clues to deciphering the history of the Solar System (Fig. 1). Due to an unusual and fortuitous orbital configuration, Lucy, which has been selected as part of NASA's Discovery Program, will perform an exhaustive landmark investigation that visits six of these primitive asteroids, covering both the L4 and L5 swarms, all the known taxonomic types, the largest remnant of a catastrophic collision, and a nearly equal mass binary. It will use a suite of high-heritage remote sensing instruments to map the geology, surface color and composition, thermal and other physical properties of its targets at close range. Thus, Lucy, like the human fossil for which it is named, will revolutionize the understanding of our origins.

Trojan planets in HD 108874

Abstract: Aims. It turned out recently that, in addition to a large planet with a semimajor axis a ∼ 1 AU and a low eccentricity (e ∼ 0.07), the extrasolar planetary system HD 108874 harbors another massive planet with 2.43 AU < a < 2.93 AU. The inner planet is orbiting the G5 host star in the habitable zone (=HZ); so that we could established stable regions for Earth-like Trojan planets. Methods. We integrated some 10 5 orbits of fictitious Trojans around the Lagrangian points for up to 107 years and checked the stability of the orbital elements and their chaoticity with the aid of the Fast Lyapunov Indicator. Results. It turns out that this multiplanetary system is the first one where - with the uncertainties in eccentricity and semimajor axes of the outer planet - the existence of Trojan terrestrial planets in stable orbits in the HZ is possible for some combinations of the orbital parameters.