Multiple Movers Research Articles

Moving Out and Back In: Unpacking Boomerang Employment and its Consequences

As employee mobility drastically increases for the modern workforce, returning to one’s previous employer (“boomerang” employment) is increasingly becoming a career pattern pursued by both job seekers and organizations. Having crossed inter-organizational boundaries at least twice (upon turnover and re-entry), boomerangs characterize a unique and understudied type of mobility within and between organizations. Five papers comprising this symposium explore (1) what boomerangs bring to the table both in terms of their own performance behaviors and their influence on the behaviors of their coworkers and (2) how boomerang employment differs from other types of employee mobility patterns, e.g., stayers, multiple movers, and alumni who do not become boomerangs. Leveraging the hybrid nature of boomerang employment, this symposium seeks to deepen our understanding of the boomerang phenomenon while contributing to broader scholarship on employee mobility, careers, and human resources. In with the Old? Examining When Boomerang Employees Outperform New Hires Presenter: JR Keller; Cornell U. Presenter: Rebecca Rheinhardt Kehoe; Cornell U. Presenter: Matthew James Bidwell; U. of Pennsylvania Returning Employees: They Are Back But Are They Here To Stay? Presenter: John E. Delery; U. of Arkansas Presenter: Dorothea Roumpi; Pennsylvania State U. Presenter: Samantha A. Conroy; Colorado State U. You Can’t Go Home Again: Cooperative Performance Behavior Between Boomerang and Incumbent Employees Presenter: Thorsten Grohsjean; Bocconi U. Presenter: Gina Dokko; U. of California, Davis Presenter: Philip Yang; U. of Tuebingen Are Boomerangs More Like Movers or Stayers? Somewhere in Between? Or Something Else? Presenter: Rhett Andrew Brymer; U. of Cincinnati Presenter: Yeongsu Kim; U. of Massachusetts - Amherst Presenter: John Mawdsley; HEC Paris Presenter: Peter D Sherer; U. of Calgary Presenter: Robert Leonard; Miami U. Ohio Going Backwards to Move Forward: The Link Between Career Competencies and Boomerang Employment Presenter: Rebecca M. Paluch; Sauder School of Business, U. of British Columbia Presenter: Yuna Cho; Yale School of Management

Sensorless Position Estimation of a Planar Motor Having Multi Movers

A planar motor with multiple movers has been developed to save the temporary storage space and automate packages loading and unloading in small warehouses. We propose a sensorless position estimation method for the multiple movers with permanent magnets and iron cores using each coil’s inductance under the movers. The inductances are measured in real-time using the current response, and each distance between the coil and the iron core is determined. The position measurement accuracy is evaluated using an experimental planar motor.

Effects of Economic Crisis on International Circulators to Hungary

Circular mobilities have become frequent during the era of globalisation. This contribution provides empirical evidence relevant to the long-term international circular migrants admitted into Hungary in economic crisis period 2009-2012 in comparison with before decline of 2006-2008. The principal aim of this paper is to quantify some socio-demographic effects of economic crisis on the international circulators. Initially, we define the circulation within the conceptual framework between the continuum of transnationalism and translocalism. This is achieved by performing the critical literature review on definitions of circulation followed by the international migration and economic contexts. Then we analyse macro-scale data set on long-term international circular migrants based on an original statistical method. In the light of absolute and relative indicators we study changes in time series of circulators in comparison with first immigrants as reference group. We seek to gain insight into the change of socio-demographic composition of international circulators by gender, age and family status. We embed the empirical results into the recent migratory context and try to find possible explanations and interpretations of the effects measured. Lastly, we guess a new characteristic of multiple movers, namely international circulators are partially resistant to some negative effects of economic crisis.

Detection of Multiple Movers Based on Single Channel Source Separation of Their Micro-Dopplers

Studies have demonstrated the usefulness of micro-Doppler signatures for classifying dynamic radar targets such as humans, helicopters, and wind turbines. However, these classification works are based on the assumption that the propagation channel consists of only a single moving target. When multiple targets move simultaneously in the channel, the micro-Dopplers, in their radar backscatter, superimpose thereby distorting the signatures. In this paper, we propose a method to detect multiple targets that move simultaneously in the propagation channel. We first model the micro-Doppler radar signatures of different movers using dictionary learning techniques. Then, we use a sparse coding algorithm to separate the aggregate radar backscatter signal from multiple targets into their individual components. We demonstrate that the disaggregated signals are useful for accurately detecting multiple targets.

Why Continuous Motions Cannot Be Composed of Sub-motions: Aristotle on Change, Rest, and Actual and Potential Middles

Abstract I examine the reasons Aristotle presents in Physics VIII 8 for denying a crucial assumption of Zeno’s dichotomy paradox: that every motion is composed of sub-motions. Aristotle claims that a unified motion is divisible into motions only in potentiality (δυνάμει). If it were actually divided at some point, the mobile would need to have arrived at and then have departed from this point, and that would require some interval of rest. Commentators have generally found Aristotle’s reasoning unconvincing. Against David Bostock and Richard Sorabji, inter alia, I argue that Aristotle offers a plausible and internally consistent response to Zeno. I defend Aristotle’s reasoning by using his discussion of what to say about the mobile at boundary instants, transitions between change and rest. There Aristotle articulates what I call the Changes are Open, Rests are Closed Rule: what is true of something at a boundary instant is what is true of it over the time of its rest. By contrast, predications true of something over its period of change are not true of the thing at either of the boundary instants of that change. I argue that this rule issues from Aristotle’s general understanding of change, as laid out in Phys. III. It also fits well with Phys. VI, where Aristotle maintains that there is a first boundary instant included in the time of rest, but not a “first in which the mobile began to change.” I then show how this rule underlies Aristotle’s argument that a continuous motion cannot be composed of actual sub-motions. Aristotle distinguishes potential middles, points passed through en route to a terminus, from actual middles. The Changes are Open, Rests are Closed Rule only applies to actual middles, because only they are boundaries of change that the mobile must arrive at and then depart from. On my reading, Aristotle argues that the instant of arrival, the first instant at which the mobile has come to be at the actual middle, cannot belong to the time of the subsequent motion. If it did, the mobile would already be moving towards the next terminus and thus, per Phys. VI 6, would have already left. But it cannot have moved away from the midpoint at the very same moment it has arrived there. This means that the instant of arrival must be separated from the time of departure by an interval of rest. I show how Aristotle’s reasoning applies generally to rule out any continuous reflexive motion or continuous complex rectilinear motion. On my interpretation, however, the argument does not apply to every change of direction. When, as in the case of projectile motion, multiple movers and their relative powers explain why the mobile changes directions, distinct sub-motions are not involved. Aristotle holds that such motions cannot be continuous, not because they involve intervals of rest, but because they involve multiple causes of motion. My interpretation of the Changes are Open, Rests are Closed Rule allows us to make better sense of Aristotle’s argument than any previous interpretation.

Magnetic Flux Distribution of Linear Machines with Novel Three-Dimensional Hybrid Magnet Arrays.

The objective of this paper is to propose a novel tubular linear machine with hybrid permanent magnet arrays and multiple movers, which could be employed for either actuation or sensing technology. The hybrid magnet array produces flux distribution on both sides of windings, and thus helps to increase the signal strength in the windings. The multiple movers are important for airspace technology, because they can improve the system’s redundancy and reliability. The proposed design concept is presented, and the governing equations are obtained based on source free property and Maxwell equations. The magnetic field distribution in the linear machine is thus analytically formulated by using Bessel functions and harmonic expansion of magnetization vector. Numerical simulation is then conducted to validate the analytical solutions of the magnetic flux field. It is proved that the analytical model agrees with the numerical results well. Therefore, it can be utilized for the formulation of signal or force output subsequently, depending on its particular implementation.

Metal-Organic Framework "Swimmers" with Energy-Efficient Autonomous Motility.

Placed at a water/air interface, particles of porphyrin-based MOFs (metal-organic frameworks) cut from large-area films display efficient, multiple-use autonomous motility powered by release of solvents incorporated in the MOF matrix and directionality dictated by their shapes. The particles can be refueled multiple times and can achieve speeds of ca. 200 mm·s-1 with high kinetic energy per unit of chemical "fuel" expended (>50 μJ·g-1). Efficiency of motion depends on the nature of the fuel used as well as the microstructure and surface wettability of the MOF surface. When multiple movers are present at the interface, they organize into "open" structures that exhibit collective, time-periodic motions.

Magnetic flux field analysis of slotless PM linear machine with multiple tubular movers

Magnetic flux field analysis of slotless PM linear machine with multiple tubular movers

The Internal Migration of Immigrants: Differences between One‐Time and Multiple Movers in Spain

ABSTRACTResearch on the mobility and residential patterns of immigrants within receiving countries is abundant. The selective nature of movers and the location of immigrants are issues that have received special attention. Most studies are premised on the supposition that immigrants move only once. However, for a number of immigrants, internal migration is a dynamic process in which more than one movement is involved. This article extends the literature by disaggregating immigrants according to their number of internal migrations. We use data from a new and rich retrospective survey to examine the determinants of migration trajectories and the effects of the location choices of immigrants. We elaborate a set of indicators to assess the importance of the spatial assimilation theory and other main theoretical frameworks. This article concentrates on Spain, a recent main migratory destination in Europe and worldwide. Results reveal the existence of significant differences between one‐time and multiple movers. The selective nature of multiple movers is explained in part by the spatial assimilation paradigm. Further results show that both one‐time and multiple movers tend to reside outside ethnic concentrations as a result of their mobility experience within Spain. Copyright © 2012 John Wiley & Sons, Ltd.

Doppler and direction-of-arrival (DDOA) radar for multiple-mover sensing

A low-cost two-element receiving array concept is investigated for detecting multiple moving targets in indoor surveillance applications. Conventional direction-of-arrival (DOA) detection requires the use of an antenna array with multiple elements. Here we investigate the use of only two elements in the receiver array. The concept entails resolving the Doppler frequencies of the returned signals from the moving targets, and then measuring the phase difference at each Doppler frequency component to calculate the DOA of the targets. Simulations are performed to demonstrate the concept and to asses the DOA errors for multiple movers. An experimental system is designed and constructed to test the concept. The system consists of a two-element receiver array operating at 2.4 GHz. Measurement results of human subjects in indoor environments are presented, including through-wall scenarios.

Residential mobility of individuals with diagnosed schizophrenia

Several studies have compared the residential mobility of individuals with schizophrenia to mobility of individuals with other mental disorders or with no mental disorders. Little research has been undertaken to describe differences between single (i.e., infrequent) and multiple (i.e., frequent) movers with schizophrenia, and the association between frequency of mobility and health and health service use. The data source is population-based administrative records from the province of Manitoba, Canada. Hospital separations and physicians claims are linked to health registration files to identify a cohort with diagnosed schizophrenia and track changes in residential postal code over time. Single movers (N = 736), who had only one postal code change in a 2.5-year observation period, are compared to multiple movers (N = 252), who had two or more postal code changes. Differences in demographic, socioeconomic, and geographic characteristics, measures of health service use, and the prevalence of several chronic diseases were examined using chi(2) tests, logistic regression, and generalized linear regression. Multiple movers were significantly more likely to be young, live in socioeconomically disadvantaged neighborhoods, and reside in the urban core. The prevalence of a co-occurring substance use disorder and arthritis was higher for multiple than single movers. Use of acute and ambulatory care for schizophrenia, other mental disorders, as well as physical disorders was generally higher for multiple than single movers. Frequency of mobility should be considered in the development of needs-based funding plans and service delivery interventions. Other opportunities to use record-linkage techniques to examine residential mobility are considered.

Mobile Livelihoods: The Sociocultural Practices of Circular Migrants between Puerto Rico and the United States

This article focuses on the bilateral flow of people between Puerto Rico and the United States - what has come to be known as circular, commuter, or revolving-door migration. It documents the migrants' livelihood practices based on a recent field study of population flows between Puerto Rico and the mainland. Specifically, the basic characteristics of multiple movers, one-time movers and nonmovers residing in Puerto Rico are compared. More broadly, the article assesses the implications of circular migration for Puerto Rican communities on and off the island. The author's basic argument is that the constant displacement of people - both to and from the island – blurs the territorial, linguistic, and juridical boundaries of the Puerto Rican nation. As people expand their means of subsistence across space, they develop multiple attachments to various localities. In the Puerto Rican situation, such mobile livelihoods are easier to establish than in other places because of the free movement of labor and capital between the island and the mainland. The author hypothesizes that circulation does not entail major losses in human capital for most Puerto Ricans, but rather often constitutes an occupational, educational, and linguistic asset.

Frequency of geographic mobility: Findings from the National Health Interview Survey

Age stands out as an important factor in multiple moves over a relatively short period of time. In addition, in the NHIS data whites show a higher tendency to be multiple movers than do blacks. It was also found that persons defined as interstate migrants moved more often than either intrastate migrants or local movers, but it is impossible to conclude anything more definitive about that relationship. In conclusion, mobility defined as a move rather than as a mover is clearly higher than estimates derived from five-year census data or the CPS, which only use the idea of a mover. On the whole, though, over three-year periods most persons do not move at all or they move and then return. Of those who do change residence, the majority move only once. By far the bulk of moves is accounted for by a relatively small segment of Americans. Of 34,000 moves reported in the NHIS, more than one-half were made by a small number of persons--4,400--who not only constituted scarcely one-fourth of all movers but were less than 1 out of every 11 Americans.

U.S. Patent Specifications

In a mechanism for synchronizing multiple prime movers, a liquid pump, a plurality of hydraulic motors in series therewith, there being a hydraulic motor for each prime mover, differential means associated with each of said prime movers and operable by the difference in relative speeds of said prime movers and said hydraulic motors, and mechanical connecting means positively connecting a speed control member of each of said prime movers with the respective differential means for governing the speed of each of said prime movers.