Testing the consistency of wildlife data types before combining them: the case of camera traps and telemetry.

Wildlife data gathered by different monitoring techniques are often combined to estimate animal density. However, methods to check whether different types of data provide consistent information (i.e., can information from one data type be used to predict responses in the other?) before combining them are lacking. We used generalized linear models and generalized linear mixed-effects models to relate camera trap probabilities for marked animals to independent space use from telemetry relocations using 2 years of data for fishers (Pekania pennanti) as a case study. We evaluated (1) camera trap efficacy by estimating how camera detection probabilities are related to nearby telemetry relocations and (2) whether home range utilization density estimated from telemetry data adequately predicts camera detection probabilities, which would indicate consistency of the two data types. The number of telemetry relocations within 250 and 500 m from camera traps predicted detection probability well. For the same number of relocations, females were more likely to be detected during the first year. During the second year, all fishers were more likely to be detected during the fall/winter season. Models predicting camera detection probability and photo counts solely from telemetry utilization density had the best or nearly best Akaike Information Criterion (AIC), suggesting that telemetry and camera traps provide consistent information on space use. Given the same utilization density, males were more likely to be photo-captured due to larger home ranges and higher movement rates. Although methods that combine data types (spatially explicit capture-recapture) make simple assumptions about home range shapes, it is reasonable to conclude that in our case, camera trap data do reflect space use in a manner consistent with telemetry data. However, differences between the 2 years of data suggest that camera efficacy is not fully consistent across ecological conditions and make the case for integrating other sources of space-use data

The coordination issues of relocations: How proximity still matters in location of software development activities\r\n

The objective of this article is to investigate the dynamics of relocations at the micro-economic level. By proposing a grid of “dynamics of proximities”, we focus on the coordination issues which seem to be missing from most of analyses carried about relocations. We apply our framework to software development activities. The proposition we develop in this paper is the following: mobility, ICT use and modularity reduce the need for geographical proximity and favour relocations but, in order to succeed, relocations need to have the support of organisational and institutional proximities to ensure effective coordination between entities and individuals.relocation, software development, dynamics of proximity, coordination.

The coordination issues of relocations: How proximity still matters in location of software development activities\r\n

The objective of this article is to investigate the dynamics of relocations at the micro-economic level. By proposing a grid of “dynamics of proximities”, we focus on the coordination issues which seem to be missing from most of analyses carried about relocations. We apply our framework to software development activities. The proposition we develop in this paper is the following: mobility, ICT use and modularity reduce the need for geographical proximity and favour relocations but, in order to succeed, relocations need to have the support of organisational and institutional proximities to ensure effective coordination between entities and individuals.relocation, software development, dynamics of proximity, coordination

A Multi-Heuristic Approach for Solving the Pre-Marshalling Problem

Minimizing the number of reshuffling operations at maritime container terminals incorporates the Pre-Marshalling Problem (PMP) as an important problem. Based on an analysis of existing solution approaches we develop new heuristics utilizing specific properties of problem instances of the PMP. We show that the heuristic performance is highly dependent on these properties. We introduce a new method that exploits a greedy heuristic of four stages, where for each of these stages several different heuristics may be applied. Instead of using randomization to improve the performance of the heuristic, we repetitively generate a number of solutions by using a combination of different heuristics for each stage. In doing so, only a small number of solutions is generated for which we intend that they do not have undesirable properties, contrary to the case when simple randomization is used. Our experiments show that such a deterministic algorithm significantly outperforms the original nondeterministic method when the quality of found solutions is observed, with a much lower number of generated solutions

How does digitalization affect headquarters and what does it mean for CEE-focused headquarters in Austria?

Headquarters (HQs) represent central units within corporationsi and their goal is to add value to the firm and its respective subunits. They do so by taking over various responsibilities, such as allocating resources within the firm, coordinating and monitoring subunits, and identifying and realizing synergies, among others. HQs are also important for the economy of the countries they are located in, as they offer for example high-value employment, increased demand for related business services (e.g., legal and financial services), and represent a non-trivial source of tax income. Additionally, there is scientific evidence suggesting that the location of the HQ influences its investment decisions and consequently adjacent economies (e.g., investments that are in regions close to the HQ are favoured). Thus, many countries consider it important to attract and maintain HQsii. In this article, we will focus on a topic that has not received much attention yet. Specifically, we discuss how digitalization (i.e., recent advancements in areas such as big data analytics, automation, artificial intelligence, the internet of things, etc.) influences HQs in Austria, most of which have a strong focus on CEE countries. Companies are dealing with a variety of issues stemming from digitalization, which results in changes to business models, firm processes, and company culturesiii. Yet, digitalization also affects the role and value added of the HQs but we still lack a clear understanding of thativ. In the following, we first discuss Austria as a location for HQs, then the impact of digitalization on HQs, and finally, we explore how the digitalization might influence the attractiveness of Austria for CEE-oriented HQs. Thereby, we refer to recent empirical material that we have collected

Is Central Paris still that rich?

From 1975 to 1999, employment in Paris metropolitan area has become more and more decentralized. This deconcentration is almost half spread and half clustered. Parallel to the sprawl of jobs, the growth of a services oriented economy has led to an increase in sectoral concentration. But there are no clear evidences of a vertical spatial desintegration, because by the same time the places tend to diversify. An explanation might be that the sprawl relies both on endogenous job creations and on job relocations: the relocations tend to increase the specialisation of the clusters but endogenous growth is more diverse and residential.

An Integrated Approach to Seismic Event Location: 1. Evaluating How Method of Location Affects the Volume of Groups of Hypocenters

When seismic events occur in spatially compact clusters, the volume and geometric characteristics of these clusters often provides information about the relative effectiveness of different location methods, or about physical processes occurring within the hypocentral region. This report defines and explains how to determine the convex polyhedron of minimum volume (CPMV) surrounding a set of points. We evaluate both single-event and joint hypocenter determination (JHD) relocations for three rather different clusters of seismic events: 1) nuclear explosions from Mururoa relocated using P and PKP phases reported by the ISC, 2) intermediate depth earthquakes near Bucaramanga, Colombia, relocated using P and PKP phases reported by the ISC, and 3) shallow earthquakes near Vanuatu (formerly, the New Hebrides), relocated using P and S phases from a local station network. This analysis demonstrates that different location methods markedly affect the volume of the CPMV, however, volumes for JHD relations are �not always smaller than volumes for single-event relocations.Phillips Laboratory, Directorate of Geophysics, Air Force Material Command, Hanscom Air Force Base, MassachusettsInstitute for Geophysic

Modeling spatial social complex networks for dynamical processes

The study of social networks --- where people are located, geographically, and how they might be connected to one another --- is a current hot topic of interest, because of its immediate relevance to important applications, from devising efficient immunization techniques for the arrest of epidemics, to the design of better transportation and city planning paradigms, to the understanding of how rumors and opinions spread and take shape over time. We develop a spatial social complex network (SSCN) model that captures not only essential connectivity features of real-life social networks, including a heavy-tailed degree distribution and high clustering, but also the spatial location of individuals, reproducing Zipf's law for the distribution of city populations as well as other observed hallmarks. We then simulate Milgram's Small-World experiment on our SSCN model, obtaining good qualitative agreement with the known results and shedding light on the role played by various network attributes and the strategies used by the players in the game. This demonstrates the potential of the SSCN model for the simulation and study of the many social processes mentioned above, where both connectivity and geography play a role in the dynamics.Comment: 10 pages, 6 figure