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31.
Consider a set of points in the plane with Gaussian perturbations about a regular mean configuration in which a Delaunay triangulation of the mean of the process is comprised of equilateral triangles of the same size. The points are labelled at random as black or white with variances of the perturbations possibly dependent on the colour. By investigating triangle subsets (with four sets of possible colour labels for the vertices) in detail we propose various test statistics based on a Procrustes shape analysis. A simulation study is carried out to investigate the relative merits and the adequacy of the approximations used in the distributional results, as well as a comparison with simulation methods based on nearest-neighbour distances. The methodology is applied to an investigation of regularity in human muscle fibre cross-sections. 相似文献
32.
The use of GARCH type models and computational-intelligence-based techniques for forecasting financial time series has been proved extremely successful in recent times. In this article, we apply the finite mixture of ARMA-GARCH model instead of AR or ARMA models to compare with the standard BP and SVM in forecasting financial time series (daily stock market index returns and exchange rate returns). We do not apply the pure GARCH model as the finite mixture of the ARMA-GARCH model outperforms the pure GARCH model. These models are evaluated on five performance metrics or criteria. Our experiment shows that the SVM model outperforms both the finite mixture of ARMA-GARCH and BP models in deviation performance criteria. In direction performance criteria, the finite mixture of ARMA-GARCH model performs better. The memory property of these forecasting techniques is also examined using the behavior of forecasted values vis-à-vis the original values. Only the SVM model shows long memory property in forecasting financial returns. 相似文献
33.
Mohammed Almahmood Oliver Schulze Trine Agervig Carstensen Gertrud Jørgensen 《Planning Practice and Research》2018,33(2):186-210
Riyadh is one of the most gender-segregated cities in the world. However, as gender segregation is less enforced on sidewalks, it provides an optimal case study for a space where women and men may be co-present. Thus, this paper aims to increase the understanding of the relationship between sociocultural norms and spatial programming regarding spatio-temporal inclusion or exclusion in public urban spaces. The results show that women’s use and access to sidewalks are influenced by gender norms, religious values, gendered regulations, and generic spatial programming. For instance, regulations limit the use of outdoor seating to men only, thus sidewalks adjacent to, e.g., cafes function as mono-gender spaces dominated by men. However, young women negotiate spatially bounded gender norms through their presence, behaviour, and dress. Although sidewalks are conceived as men’s space, women account for nearly half of the users, but their use often goes unnoticed as women self-regulate their spatio-temporal and visible presence. The study presents six types of women’s spatio-temporal behaviours with varying degrees of visible and invisible users. Ultimately, this paper argues that planning for inclusive sidewalks cannot be addressed solely through the ‘universal’ characterization of space; it should also be supplemented by context-specific knowledge regarding the socio-spatial needs. 相似文献
34.
After the discovery of oil in 1970s, the United Arab Emirates experienced explosive growth and was able to establish a strong economy in 30 years. Since then, the country has attracted foreign direct investment, and it has maintained its growth strategy by relying on foreign skilled labourers from around the world. Consequently, Emirati nationals were predominantly recruited to and preferred the public sector. Today, as government growth stagnates, the United Arab Emirates’ government is encouraging the private sector to recruit more Emirati nationals. This paper analyzes the current Emiratisation process by looking into the barriers to it via a content analysis of business-focused newspapers published in the country. Unlike previous research, this paper prioritizes the challenges in descending order: skill standards, salary and benefits, and business hours. These challenges have impeded the recruitment of Emirati nationals into the private sector. 相似文献
35.
Michael A. Mullens Mohammed Arif Robert L. Armacost Thomas A. Gawlik Robert L. Hoekstra 《Production and Operations Management》2005,14(3):286-300
This paper describes a structured methodology for decomposing the conceptual design problem in order to facilitate the design process and result in improved conceptual designs that better satisfy the original customer requirements. The axiomatic decomposition for conceptual design method combines Alexander's network partitioning formulation of the design problem with Suh's Independence Axiom. The axiomatic decomposition method uses a cross‐domain approach in a House of Quality context to estimate the interactions among the functional requirements that are derived from a qualitative assessment of customer requirements. These interactions are used in several objective functions that serve as criteria for decomposing the design network. A new network partitioning algorithm is effective in creating partitions that maximize the within‐partition interactions and minimize the between‐partition interactions with appropriate weightings. The viability, usability, and value of the axiomatic decomposition method were examined through analytic comparisons and qualitative assessments of its application. The new method was examined using students in engineering design capstone courses and it was found to be useable and did produce better product designs that met the customer requirements. The student‐based assessment revealed that the process would be more effective with individuals having design experience. In a subsequent assessment with practicing industrial designers, it was found that the new method did facilitate the development of better designs. An important observation was the need for limits on partition size (maximum of four functional requirements.) Another issue identified for future research was the need for a means to identify the appropriate starting partition for initiating the design. 相似文献
36.
37.
Aboramadan Mohammed Kundi Yasir Mansoor 《Voluntas: International Journal of Voluntary and Nonprofit Organizations》2020,31(6):1254-1267
VOLUNTAS: International Journal of Voluntary and Nonprofit Organizations - With limited studies on the relative effectiveness of different leadership styles in NPOs, the purpose of this paper is to... 相似文献
38.
Mohammed I. At-Twaijri Ibrahim A. Al-Muhaiza 《International Journal of Value-Based Management》1996,9(2):121-131
Managerial values are not the same across the world. Therefore, Multinational Corporations may be making costly decisions if they assume that corporate policies will receive the same attention, understanding or acceptance in their branches over the world. This paper applies Hofstede's four cultural dimensions to the Gulf Cooperation Council (GCC) countries. It also compares Hofstede's results with regard to these four cultural dimensions with our findings. The results of this study show that countries change. They reemphasize the concept that ethnocentric management theories have been untenable. This implies the necessity that Multinational Corporations should study the culture of the country they plan to do business with before starting the negotiations process that precedes the operations in that country and also to monitor changes in the life style of these countries over time. When Multinational Corporations become aware of the international workforce management and the differences between different cultures, they will save themselves costly troubles, loss of qualified personnel as well as loosing international customers. Therefore, it is important for Multinational Corporations to utilize management theories available to them through research and experience.The program leading to this article was supported in part by a grant from KFUPM. 相似文献
39.
Çokgezen Murat Hussen Mohammed Seid 《Voluntas: International Journal of Voluntary and Nonprofit Organizations》2021,32(2):414-429
VOLUNTAS: International Journal of Voluntary and Nonprofit Organizations - While the impact of government interference to the religious domain has long been discussed in previous literature,... 相似文献
40.
This paper critically reviews Ken Binmores non- utilitarian and game theoretic solution to the Arrow problem. Binmores solution belongs to the same family as Rawls maximin criterion and requires the use of Nash bargaining theory, empathetic preferences, and results in evolutionary game theory. Harsanyi has earlier presented a solution that relies on utilitarianism, which requires some exogenous valuation criterion and is therefore incompatible with liberalism. Binmores rigorous demonstration of the maximin principle for the first time presents a real alternative to a utilitarian solution. 相似文献