A review of system integration and current integrity monitoring methods for positioning in intelligent transport systems

Applications of intelligent transportation systems are continuously increasing. Since positioning is a key component in these systems, it is essential to ensure its reliability and robustness, and monitor its integrity so that the required levels of positioning accuracy, integrity, continuity and availability can be maintained. In challenging environments, such as urban areas, a single navigation system is often difficult to fulfil the positioning requirements. Therefore, integrating different navigation sensors becomes intrinsic, which may include the global navigation satellite systems, the inertial navigation systems, the odometers and the light detection and ranging sensors. To bind the positioning errors within a pre-defined integrity risk, the integrity monitoring is an essential step in the positioning service, which needs to be fulfilled for integrated vehicular navigation systems used in intelligent transportation systems. Developing such innovative integrity monitoring techniques requires knowledge of many relevant aspects including the structure, positioning methodology and different errors affecting the positioning solution of the individual and integrated systems. Moreover, knowledge is needed for the current mitigation techniques of these errors, for possible fault detection and exclusion algorithms and for computation of protection levels. This paper provides an overview and discussion of these aspects with a focus on intelligent transportation systems

A study of the 2S Lamb shift of one-electron ions in an electron beam ion trap

SIGLEAvailable from British Library Document Supply Centre-DSC:D194259 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Mammal taxonomy without taxonomists: A reply to Zachos and Lovari

Ontological and epistemological properties of the Phylogenetic Species Concept (PSC) as applied in recent mammalian taxonomic works are redefined and defended against criticisms raised by Zachos and Lovari (2013), which we find inapplicable to taxonomy b

Poor taxonomy and genetic rescue are possible co-agents of silent extinction and biogeographic homogenization among ungulate mammals

Genetic rescue is a measure to mitigate the effects of reduced genetic variation in endangered small, isolated (inbreed) populations by introducing new genetic variation into such populations. This is usually accomplished by translocating individuals from a related population, assumed to belong to the same, often polytypic species, into the endangered population. If, however, the taxonomic classification does not reflect the ‘true’ diversity, genetic rescue can have detrimental effects on the survival of the endangered population (e.g. outbreeding depression). Here we point to problems if erroneous taxonomy informs such translocating strategies. Actions that promote artificial admixture of evolutionary lineages may be ineffective, or they may homogenize existing diversity and biogeographic patterns instead of protecting them. The extreme result is to drive target species and/or cryptic lineages to silent extinction. We single out conspicuous examples to illustrate the negative impacts of actions, which have resulted from artificial interbreeding of evolutionary distinct species or ill-conceived ‘genetic augmentation’. In such cases, translocations negate the overarching objective of biodiversity conservation: embodied in the concept of phylogenetic distinctiveness (PD), the encompassing scientific foundation of biodiversity conservation aims to maximize representation of the evolutionary history at the levels of species and ecosystems. A major underlying problem that we identify is persisting taxonomic inertia maintaining e.g., an overly simplified ungulate taxonomy, which is in most cases equivalent to a certain genomic incompatibility or a dilution of specific adaptations. Translocations and genetic rescue should only be employed, if potentially negative effects of the measures can be ruled out (including wrong taxonomy). Poor taxonomy has been – and indeed remains – at fault

Poor taxonomy and genetic rescue are possible co-agents of silent extinction and biogeographic homogenization among ungulate mammals

Genetic rescue is a measure to mitigate the effects of reduced genetic variation in endangered small, isolated (inbreed) populations by introducing new genetic variation into such populations. This is usually accomplished by translocating individuals from a related population, assumed to belong to the same, often polytypic species, into the endangered population. If, however, the taxonomic classification does not reflect the ‘true’ diversity, genetic rescue can have detrimental effects on the survival of the endangered population (e.g. outbreeding depression). Here we point to problems if erroneous taxonomy informs such translocating strategies. Actions that promote artificial admixture of evolutionary lineages may be ineffective, or they may homogenize existing diversity and biogeographic patterns instead of protecting them. The extreme result is to drive target species and/or cryptic lineages to silent extinction. We single out conspicuous examples to illustrate the negative impacts of actions, which have resulted from artificial interbreeding of evolutionary distinct species or ill-conceived ‘genetic augmentation’. In such cases, translocations negate the overarching objective of biodiversity conservation: embodied in the concept of phylogenetic distinctiveness (PD), the encompassing scientific foundation of biodiversity conservation aims to maximize representation of the evolutionary history at the levels of species and ecosystems. A major underlying problem that we identify is persisting taxonomic inertia maintaining e.g., an overly simplified ungulate taxonomy, which is in most cases equivalent to a certain genomic incompatibility or a dilution of specific adaptations. Translocations and genetic rescue should only be employed, if potentially negative effects of the measures can be ruled out (including wrong taxonomy). Poor taxonomy has been – and indeed remains – at fault

Species definitions and conservation: a review and case studies from African mammals

The nature of species, especially as applied to large mammals, is of major concern in conservation. Here, we briefly comment on recent thinking in alpha taxonomy, and assert that species are in essence evolutionary lineages, and that the most effective way of recognising them is by their diagnosability, i.e. the so-called Phylogenetic Species Concept. We further assert that the amount of genetic distance is not a relevant datum for distinguishing species, and that the ability to interbreed is not relevant. We consider a few case studies, especially that of the Northern White Rhinoceros Ceratotherium cottoni, and also species in Loxodonta, Giraffa and Oreotragus.PJT acknowledges the support of the University of Venda, the National Research Foundation and the Department of Science and Technology under the South African Research Chair Initiative (SARChI) on Biodiversity Value and Change within the Vhembe Biosphere Reserve hosted at University of Venda and co-hosted by the Centre for Invasion Biology at University of Stellenbosch