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STIDNet: Identity-Aware Face Forgery Detection with Spatiotemporal Knowledge Distillation
Get PDFThe impressive development of facial manipulation techniques has raised severe public concerns. Identity-aware methods, especially suitable for protecting celebrities, are seen as one of promising face forgery detection approaches with additional reference video. However, without in-depth observation of fake video’s characteristics, most existing identity-aware algorithms are just naive imitation of face verification model and fail to exploit discriminative information. In this article, we argue that it is necessary to take both spatial and temporal perspectives into consideration for adequate inconsistency clues and propose a novel forgery detector named SpatioTemporal IDentity network (STIDNet). To effectively capture heterogeneous spatiotemporal information in a unified formulation, our STIDNet is following a knowledge distillation architecture that the student identity extractor receives supervision from a spatial information encoder (SIE) and a temporal information encoder (TIE) through multiteacher training. Specifically, a regional sensitive identity modelling paradigm is proposed in SIE by introducing facial blending augmentation but with uniform identity label, thus encourage model to focus on spatial discriminative region like outer face. Meanwhile, considering the strong temporal correlation between audio and talking face video, our TIE is devised in a cross-modal pattern that the audio information is introduced to supervise model exploiting temporal personalized movements. Benefit from knowledge transfer from SIE and TIE, STIDNet is able to capture individual’s essential spatiotemporal identity attributes and sensitive to even subtle identity deviation caused by manipulation. Extensive experiments indicate the superiority of our STIDNet compared with previous works. Moreover, we also demonstrate STIDNet is more suitable for real-world implementation in terms of model complexity and reference set size
A comparison of dermal toxicity models; assessing suitability for safe(r)-by-design decision-making and for screening nanomaterial hazards
Get PDFThe objective of Safe-by-Design (SbD) is to support the development of safer products and production processes, and enable safe use throughout a materials' life cycle; an intervention at an early stage of innovation can greatly benefit industry by reducing costs associated with the development of products later found to elicit harmful effects. Early hazard screening can support this process, and is needed for all of the expected nanomaterial exposure routes, including inhalation, ingestion and dermal. In this study, we compare in vitro and ex vivo cell models that represent dermal exposures (including HaCaT cells, primary keratinocytes, and reconstructed human epidermis (RhE)), and when possible consider these in the context of regulatory accepted OECD TG for in vitro dermal irritation. Various benchmark nanomaterials were used to assess markers of cell stress in each cell model. In addition, we evaluated different dosing strategies that have been used when applying the OECD TG for dermal irritation in assessment of nanomaterials, and how inconsistencies in the approach used can have considerable impact of the conclusions made. Although we could not demonstrate alignment of all models used, there was an indication that the simpler in vitro cell model aligned more closely with RhE tissue than ex vivo primary keratinocytes, supporting the use of HaCaT cells for screening of dermal toxicity of nanomaterials and in early-stage SbD decision-making
Prevalence and correlates of ICD-11 prolonged grief disorder among adults living in Ukraine during the war with Russia
Get PDFBackground: Although high rates of bereavement are evident in war-affected populations, no study has investigated the prevalence and correlates of probable ICD-11 Prolonged Grief Disorder (PGD) under these circumstances. Methods: Participants were 2050 adults who participated in a nationwide survey exploring the effects of Ukraine-Russia war on the daily lives and mental health of Ukrainian people. Results: Of the total sample, 87.7% (n = 1,797) of people indicated a lifetime bereavement. In the full sample, 11.4% met the diagnostic requirements for probable ICD-11 PGD, and amongst those with a lifetime bereavement, the conditional rate of probable ICD-11 PGD was 13.0%. Significant risk factors of ICD-11 PGD included the recent loss of a loved one (6 months to a year ago), being most affected by a partner or spouse’s death, loved one dying in the war, no recent contact with the deceased prior to their death, and meeting depression and anxiety diagnostic requirements. Conclusion: The study reveals that a significant percentage of Ukrainian bereaved individuals have probable ICD-11 PGD, and identifying risk factors, particularly war-related losses, will aid in the development of intervention and prevention programs for bereaved adults
Jostling Discourses of Competition: Women leaders self-positioning
Get PDFThis study addresses the lack of research into social processes of competition in organizations and explores women leaders self-positioning in relation to the discourses of gendered competition and neoliberal competition. The discourses carry contradictory obligations for women. While the gendered competition discourse socially punishes competitive women, the neoliberal competition discourse expects competition. Through a feminist approach and critical discourse analysis of narratives from 52 women leaders we make two central contributions. First, we outline how the two discourses jostle together, fighting for attention and contradicting each other, provoking social ambiguity. We demonstrate how the women leaders adopt paradoxical self-positioning as ‘competitive–not competitive’ using four interconnected strategies of ‘denying’, ‘masking and reframing’, ‘moving on’ from and ‘diverting’ competition. Second, we extend studies of liminality and theorize how the discourses create liminality for women leaders. We elucidate how the women take up and disrupt the discourses by continually oscillating between paradoxical positions of being competitive, perceived as competitive, not competitive, no longer competitive, and competitive for organizations. Competition is identified as a toxic, gendered process, which is both harmful and aspirational, and both a liminal challenge and an opportunity for women leaders. We extend understandings of those who experience liminality in organizations, to women leaders and demonstrate how their paradoxical self-positioning affords them opportunities to discursively present as competitive
Impact of board diversity on Chinese firms’ cross-border M&A performance: An artificial intelligence approach
No full textIn this paper, we examine the impact of board demographic characteristics on Chinese firms’ cross-border Mergers and Acquisition (M&A) performance, especially the gender diversity of the board composition. We unveil that female board proportion exhibits a positive and significant effect on cross-border M&A performance. On the other hand, board member age diversity and board member education diversity play a trivial role on cross-border M&A performance. We further introduce an optimization model called Particle Swarm Optimization (PSO), which is an artificial intelligence technical application, to address the optimal board diversity regarding the M&A performance. We demonstrate that a better organized board structure, such as increasing female board presentation tend to improve cross-border M&A performance of Chinese firms. We argue that the enhanced performance from optimized board diversity might be transmitted through the channel of corporate governance. Furthermore, we reveal that the board diversity effect is stronger in private owned companies compared with state owned companies. Our results can thereby deliver implications of corporate governance
From pilgrimage to volunteer tourism: A spiritual journey in the contemporary world
Get PDFThe aim of this paper is to explore how the experiences of international volunteer tourists can contribute to the rejuvenation of the concept of pilgrimage in the contemporary world. Through thematic analysis of the individual portraits, this paper identifies the intertwining of the rejuvenation of pilgrimage with the concepts of meaning, ritual, and transformative experiences within the context of international volunteer tourism. The findings suggest that the current understanding of pilgrimage in contemporary tourism surpasses the notion of a journey to a religious destination, transcending religion itself. This paper extends the comprehension of modern pilgrimage and spirituality, and highlights the necessity for further research into the complex interconnections between tourism, religion, and spirituality
The assessment of paraspinal muscle epimuscular fat in participants with and without low back pain: A case-control study
Get PDFIt remains unclear whether paraspinal muscle fatty infiltration in low back pain (LBP) is i) solely intramuscular, ii) is lying outside the epimysium between the muscle and fascial plane (epimuscular) or iii) or combination of both, as imaging studies often use different segmentation protocols that are not thoroughly described. Epimuscular fat possibly disturbs force generation of paraspinal muscles, but is seldomly explored. This project aimed to 1) compare epimuscular fat in participants with and without chronic LBP, and 2) determine whether epimuscular fat is different across lumbar spinal levels and associated with BMI, age, sex and LBP status, duration or intensity. Fat and water lumbosacral MRIs of 50 chronic LBP participants and 41 healthy controls were used. The presence and extent of epimuscular fat for the paraspinal muscle group (erector spinae and multifidus) was assessed using a qualitative score (0–5 scale; 0 = no epimuscular fat and 5 = epimuscular fat present along the entire muscle) and quantitative manual segmentation method. Chi-squared tests evaluated associations between qualitative epimuscular fat ratings and LBP status at each lumbar level. Bivariate and partial spearman’s rho correlation assessed relationships between quantitative and qualitative epimuscular fat with participants’ characteristics. Epimuscular fat was more frequent at the L4-L5 (X2 = 13.781, p = 0.017) and L5-S1 level (X2 = 27.825, p < 0.001) in participants with LBP compared to controls, which was not found for the higher lumbar levels. The total qualitative score (combined from all levels) showed a significant positive correlation with BMI, age, sex (female) and LBP status (r = 0.23–0.55; p < 0.05). Similarly, the total area of epimuscular fat (quantitative measure) was significantly correlated with BMI, age and LBP status (r = 0.26–0.57; p < 0.05). No correlations were found between epimuscular fat and LBP duration or intensity. Paraspinal muscle epimuscular fat is more common in chronic LBP patients. The functional implications of epimuscular fat should be further explored
Extreme work in organizations: mapping the field and a future research agenda
Get PDFDespite the growing interest in the phenomenon of extreme work amongst academics, policy makers and the media, the area is characterized by different constructs, terminology, and disparate research findings on both contexts and outcomes. The aim of this positional paper, as part of a double Special Issue on extreme work and ‘working extremely’, is to provide a timely review of the field and bring some coherence to it through providing a classification of extreme work and its associated outcomes. Specifically, we use the outputs of a systematic review to capture and map the complexity of this area of research, illustrate the different contexts that influence and shape its emergence, and highlight different employee outcomes. Our typology serves as a heuristic device to categorize the 12 papers that make up this Special Issue, map potential future research questions and avenues, and identify human resource management (HRM) practice implications at multiple levels
A narrative review of global and national physical activity and sedentary behaviour guidelines development processes - The GUidelines Standards (GUS) project
Get PDFBackground: Clinical and public health guidelines serve to direct clinical practice and policy, based on the best available evidence. The World Health Organization (WHO) and national health bodies of many countries have released physical activity and sedentary behaviour guidelines. Despite significant overlap in the body of evidence reviewed, the guidelines differ across jurisdictions. This study aimed to review the processes used to develop global and national physical activity and sedentary behaviour guidelines and examine the extent to which they conform with a recommended methodological standard for the development of guidelines.Methods: We extracted data on nine sets of guidelines from seven jurisdictions (WHO, Australia, Canada, Japan, the Netherlands, United Kingdom, and United States). We rated each set of guidelines as high, medium, or low quality on criteria related to the rigour of the development process. Results: We observed variation in the quality of guidelines development processes across jurisdictions and across different criteria. Guidelines received the strongest overall ratings for criteria on clearly describing the evidence selected and stating an explicit link between the recommendations and the supporting evidence. Guidelines received the weakest overall ratings for criteria related to clearly describing the methods used to formulate the recommendations and reporting external review by experts prior to publication. Evaluated against the selected criteria, the strongest processes were undertaken by the WHO and Canada.Conclusions: Reaching agreement on acceptable guideline development processes, as well as the inclusion and appraisal procedures of different types of evidence, would help to strengthen and align future guidelines
On the Performance of a Photonic Reconfigurable Electromagnetic Band Gap Antenna Array for 5G Applications
Get PDFIn this paper, a reconfigurable Multiple-Input Multiple-Output (MIMO) antenna array is presented for 5G portable devices. The proposed array consists of four radiating elements and an Electromagnetic Band Gap (EBG) structure. Planar monopole radiating elements are employed in the array with Coplanar Waveguide Ports (CWPs). Each CWP is grounded on one side to a reflecting L-shaped structure that has an effect of improving the antenna’s directivity. It is shown that by inductively connecting Minkowski fractal structure of 1 st order to the radiating element, the impedance matching is improved that results in enhancement in the array’s bandwidth performance. The EBG structure is used to provide the isolation between antenna elements in the MIMO array. The fractal structure is connected to the L-shaped reflector through four photosensitive light dependent resistor (LDR) switches. The effect of various LDR switching configurations on the performance of the antenna is investigated. The proposed array provides a novel performance in terms of S-parameters with enhancements in the radiation properties. Such enhancements are achieved with low separation gaps between antenna elements (about λ o /16 at 3.5 GHz). It is shown that the array’s operational bands centered at 3.5 GHz and 4.65 GHz can be selected by activating certain LDR switches. The electromagnetic exposure of the array on the human body is investigated by determining the specific absorption rate (SAR). It is found that the proposed antenna shows lower SAR values compared to other antennas reported in literature. With the proposed EBG structure, the gain of the array is increased 7.5 dB (from -3.5 dBi to +4 dBi) at 3.5 GHz and by 14.3 dB (from -8.7 dBi to + 5.6 dBi) at 4.65 GHz. The average radiation efficiency between 3.5 GHz and 5.5 GHz increased by 42% from 20% to 62%. Excellent radiation characteristics of the EBG the array makes it suitable for 5G portable devices such as tablets
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