Suchergebnisse

Synthetic-aperture radar (SAR) image target detection is widely used in military, civilian and other fields. However, existing detection methods have low accuracy due to the limitations presented by the strong scattering of SAR image targets, unclear edge contour information, multiple scales, strong sparseness, background interference, and other characteristics. In response, for SAR target detection tasks, this paper combines the global contextual information perception of transformers and the local feature representation capabilities of convolutional neural networks (CNNs) to innovatively propose a visual transformer framework based on contextual joint-representation learning, referred to as CRTransSar. First, this paper introduces the latest Swin Transformer as the basic architecture. Next, it introduces the CNN's local information capture and presents the design of a backbone, called CRbackbone, based on contextual joint representation learning, to extract richer contextual feature information while strengthening SAR target feature attributes. Furthermore, the design of a new cross-resolution attention-enhancement neck, called CAENeck, is presented to enhance the characterizability of multiscale SAR targets. The mAP of our method on the SSDD dataset attains 97.0% accuracy, reaching state-of-the-art levels. In addition, based on the HISEA-1 commercial SAR satellite, which has been launched into orbit and in whose development our research group participated, we released a larger-scale SAR multiclass target detection dataset, called SMCDD, which verifies the effectiveness of our method.

AbstractCOVID‐19 represents a turbulent problem: a volatile, uncertain, complex, and ambiguous crisis, in which bounded‐rational policymakers may not be able to do everything right, but must do critical things right in order to reduce the death toll. This study conceptualizes these critical things as necessary conditions (NCs) that must be absent to prevent high early mortality from occurring. We articulate a policy‐institution‐demography framework that includes seven factors as NC candidates for high early COVID‐19 mortality. Using necessary condition analysis (NCA), this study pinpoints high levels of a delayed first response, political decentralization, elderly populations, and urbanization as four NCs that have inflicted high early COVID‐19 mortality across 110 countries. The results highlight the critical role of agility as a key dimension of robust governance solutions—a swift early public‐health response as a malleable policy action—in curbing early COVID‐19 deaths, particularly for politically decentralized and highly urbanized countries with aging populations.

Nonpharmaceutical interventions (NPIs) are important public health tools to fight against COVID-19. Governments around the world have instituted a variety of NPIs to modify individuals' behavior, giving rise to four distinct pandemic response strategies: nudge, mandate, decree, and boost. To better understand the different policy choices involved in these strategies, four countries including Sweden, China, France, and Japan were compared to identify the critical institutional and cultural determinants of national response strategy. The finding shows that various responses regarding same threat are dependent on the distinctive institutional arrangements and cultural orientation of each country, and thus, there is no One-Size-Fits-All strategy.

Purpose
By investigating trust in the organization as a mediator and traditionality as a moderator, this study aims to examine the effect perceived organizational exploitation poses on frontline hotel employees' service performance.


Design/methodology/approach
A three-wave survey that targets 219 supervisor–subordinate dyads from four Chinese hotels was conducted to test the hypotheses. The authors used SPSS 20.0 and AMOS 21.0 to analyze the data and verify the theoretical model.


Findings
This study found that perceived organizational exploitation exerts a destructive impact on frontline hotel employees' service performance. Trust in the organization is a full mediator of the link connecting perceived organizational exploitation to service performance. Furthermore, traditionality weakens perceived organizational exploitation's impact on trust in the organization and subsequent service performance.


Practical implications
The authors' findings remind hotels to cease exploiting their employees to avoid compromising service performance. Hotels should also endeavor to instill trust among employees toward the hotel and allocate more attention to employees with lower levels of traditionality.


Originality/value
First, to the best of the authors' knowledge, this study is among the first to explore the impact of perceived organizational exploitation on frontline hotel employees' service performance. Second, this study reveals a novel mechanism underlying the connection between perceived organizational exploitation and service performance. Finally, this study identifies frontline hotel employees' traditionality as a vital moderator that mitigates the negative relationships among perceived organizational exploitation, trust in the organization and service performance.

PurposeThe current study seeks to examine the link between abusive supervision and subordinate family undermining by focusing on the mediating role of work‐to‐family conflict and the moderating role of boundary strength at home.Design/methodology/approachData were collected using a three‐wave survey research design. Participants included 209 employees from a manufacturing company in China. Hierarchical regression analyses and a bootstrapping algorithm were used to test the hypothesized relationships.FindingsThe results indicate that abusive supervision is positively related to family undermining, and this relationship is mediated by work‐to‐family conflict. Moreover, boundary strength at home attenuates the direct relationship of abusive supervision with work‐to‐family conflict and its indirect relationship with family undermining.Research limitations/implicationsThis research contributes to the integration of the work‐family interface model and the abusive supervision literature by providing evidence of a link between abusive supervision in the workplace and conflict in the home. This study also indicates that abusive supervision is a problem of both organizational and societal importance in China. However, data are correlational in nature, which limits the ability to draw causal inferences.Practical implicationsFindings provide evidence that abusive supervision is a source of work‐to‐family conflict and undermining behavior in the home. Training employees to create boundaries between work and family domains may minimize the negative spillover effects of work on the family.Originality/valueThis study provides a relatively comprehensive model regarding the relationships between abusive supervision and work‐family consequences, and a promising new direction for both the leadership and work‐family literatures.