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In this paper a new time-frequency transform based on the constant-Q transform, named as adaptive quality frequency transform (AQFT), is proposed. The AQFT is a non-uniform transform with logarithmically spaced center frequencies. The CQT offers a computational disadvantage due to the large number of samples needed to assure the quality and the desired resolution at the lower frequency range. The AQFT addresses this problem precisely and limits the number of samples required by a comparable frequency division. Finally, computer simulations are provided to illustrate the performance of the proposed algorithm. According to the simulation results, the accuracy and the processing time of the AQFT and of traditional time-frequency analysis methods such as the Fast Fourier Transform (FFT), the Signal Derivate FFT (SD-FFT) and the wavelet packet transform (WPT) are contrasted.
The book outlines the grave issue of marine litter and presents a focused approach to addressing it in Vietnam through international collaboration, policy-making, and education. Marine litter is a significant global challenge affecting all marine environments. It stems from various human activities, with the consequences impacting ecosystems, marine life, and coastal communities economically and culturally. Global efforts are necessary to combat this issue, emphasizing prevention, reduction, and cleanup.
The German "Prevention, reduction and recycling of fishnets polluting Vietnamese coastal waters" supports projects to mitigate marine litter. One such initiative, the REVFIN project, targets the reduction of marine litter from fishing nets in Vietnamese waters, enhancing higher education, recycling, and creating circular economies. Recognizing that regional differences demand tailored solutions, the project advises on implementing recycling policies and frameworks, promoting sustainable practices suited to the local context.
The transition to a circular economy is essential to lessen marine litter by prioritizing the recycling of resources and sustainable waste management, which helps prevent the generation of marine litter. Adapting Western European solutions to Vietnam's unique environmental, cultural, and economic conditions is crucial for effectiveness. Learning from Europe's best practices in waste management and regulation could inspire Vietnamese solutions, fostering cooperation between government, businesses, and civil society.
This work serves as a foundation for developing strategies for managing and recycling fishing gear debris in Vietnam, combining European experiences with local objectives to empower Vietnamese stakeholders to make informed decisions for their marine ecosystems and future sustainability.
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The automotive industry with its dealerships in South Africa, has the potential to contribute to domestic economic growth, create jobs and stimulate economic competition. However, the industry faces several challenges that affect its long-term viability, organisational outcome and sustainability. Employee exposure to psychological stress and insufficient job resources impact negatively on engagement and organisational outcome. This study examined the influence of job demands and job resources on employee work engagement and work engagement on the sustainability of car dealerships in South Africa. It identified a gap in the literature in the correlation between work engagement and its impact on organisational sustainability outcomes. Against this background, the primary objective of this study was to measure the effect of engagement on the sustainability of car dealerships in South Africa. A quantitative research paradigm was applied and a sample of sales and service employees working in dealerships in South Africa was drawn. An online survey was conducted and a total of 375 usable questionnaires were returned for statistical analysis. The validity of the scales was confirmed using Cronbach’s alpha values for the individual study variables. The validity of the scales was confirmed using exploratory factor analysis (EFA). The collected data were also subjected to several statistical analyses. These included descriptive statistics, Pearson’s product moment correlations, multiple regression analysis (MRA) and the analysis of variance (ANOVA). The majority of the respondents agreed regarding their experience of work engagement at the dealerships. The regression analyses showed that mental demands, social support and autonomy have significant positive influence on work engagement. A significant positive correlation was also identified between work engagement and sustainability. The results also showed that some of the demographic variables examined in this study had significant impact on the level of work engagement. In light of the findings of this study, several recommendations were made to increase the level of work engagement of employees and the sustainability of the dealerships in order to support the achievement of the company’s goals and visions.
KEY WORDS:
Car dealerships, job demands, job resources, mental demands, emotional demands, pace and amount of work, social support, autonomy, development resources, work engagement, Triple Bottom Line, sustainability, community engagement, pollution prevention, profitability, organisational outcome.