4,363 research outputs found

    Local quasi hidden variable modelling and violations of Bell-type inequalities by a multipartite quantum state

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    We introduce for a general correlation scenario a new simulation model, a local quasi hidden variable (LqHV) model, where locality and the measure-theoretic structure inherent to an LHV model are preserved but positivity of a simulation measure is dropped. We specify a necessary and sufficient condition for LqHV modelling and, based on this, prove that every quantum correlation scenario admits an LqHV simulation. Via the LqHV approach, we construct analogs of Bell-type inequalities for an N-partite quantum state and find a new analytical upper bound on the maximal violation by an N-partite quantum state of S_{1}x...xS_{N}-setting Bell-type inequalities - either on correlation functions or on joint probabilities and for outcomes of an arbitrary spectral type, discrete or continuous. This general analytical upper bound is expressed in terms of the new state dilation characteristics introduced in the present paper and not only traces quantum states admitting an S_{1}x...xS_{N}-setting LHV description but also leads to the new exact numerical upper estimates on the maximal Bell violations for concrete N-partite quantum states used in quantum information processing and for an arbitrary N-partite quantum state. We, in particular, prove that violation by an N-partite quantum state of an arbitrary Bell-type inequality (either on correlation functions or on joint probabilities) for S settings per site cannot exceed (2S-1)^{N-1} even in case of an infinite dimensional quantum state and infinitely many outcomes.Comment: Improved, edited versio

    The Relationship Between Job Search Objectives and Job Search Behavior

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    This research expands the notion of “job search” beyond traditional models of searching for an alternative yet similar job, arguing that motivations for search are varied. Specifically, we investigate whether search objectives associate with use of different search processes. A study of high-level managers found mixed support for the hypotheses

    When Stock Options Fail to Motivate: Attribution and Context Effects on Stock Price Expectancy

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    This study draws on attribution theory and literature from compensation and strategy to investigate executives’ perceptions about their influence over the firm’s stock price. We define stock price expectancy as the extent to which executives feel that they can influence the firm’s stock price. Results from of a survey of 435 U.S. executives suggest that stock price expectancy is related to both attributional and contextual antecedents. Based on these findings we discuss implications for the extension of expectancy theory and the design and administration of incentive systems

    “You’re Nobody ‘til Somebody Loves You”: The Use of Job Search for Bargaining Leverage

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    The purpose of this research is to investigate a previously overlooked yet important objective for an employee engaging in job search – seeking alternative employment to obtain leverage against the current employer. We focus specifically on how employees conduct job search to obtain leverage, and then turn to the question of what motivates employees to adopt this objective. Using a sample of high-level managers, our results indicate the leverage-seeking job search predicts both preparatory and active search beyond the more traditional reason for engaging in job search (i.e., to change jobs). However, as expected, leverage-seeking search was a weaker predictor of the job search processes compared to searching to leave and was not significantly related to job satisfaction. Hierarchical level, perceived alternatives, financial independence, and the meaning attached to money significantly predicted leverage-seeking search, while compensation level, equity, and career plateau showed little effect. Implications for practice and future research on job search and employee retention more generally are discussed

    Fr\'echet frames, general definition and expansions

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    We define an {\it (X1,Θ,X2)(X_1,\Theta, X_2)-frame} with Banach spaces X2X1X_2\subseteq X_1, 12|\cdot|_1 \leq |\cdot|_2, and a BKBK-space (\Theta, \snorm[\cdot]). Then by the use of decreasing sequences of Banach spaces Xss=0{X_s}_{s=0}^\infty and of sequence spaces Θss=0{\Theta_s}_{s=0}^\infty, we define a general Fr\' echet frame on the Fr\' echet space XF=s=0XsX_F=\bigcap_{s=0}^\infty X_s. We give frame expansions of elements of XFX_F and its dual XFX_F^*, as well of some of the generating spaces of XFX_F with convergence in appropriate norms. Moreover, we give necessary and sufficient conditions for a general pre-Fr\' echet frame to be a general Fr\' echet frame, as well as for the complementedness of the range of the analysis operator U:XFΘFU:X_F\to\Theta_F.Comment: A new section is added and a minor revision is don

    Do it Right or Not at All: A Longitudinal Evaluation of a Conflict Managment System Implementation

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    We analyzed an eight-year multi-source longitudinal data set that followed a healthcare system in the Eastern United States as it implemented a major conflict management initiative to encourage line managers to consistently perform Personal Management Interviews (or PMIs) with their employees. PMIs are interviews held between two individuals, designed to prevent or quickly resolve interpersonal problems before they escalate to formal grievances. This initiative provided us a unique opportunity to empirically test key predictions of Integrated Conflict Management System (or ICMS) theory. Analyzing survey and personnel file data from 5,449 individuals from 2003 to 2010, we found that employees whose managers provided high-quality interviews perceived significantly higher participative work climates and had lower turnover rates. However, retention was worse when managers provided poor-quality interviews than when they conducted no interviews at all. Together these findings highlight the critical role that line mangers play in the success of conflict management systems
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