1,722,048 research outputs found
Multi-stage stochastic modelling for global supply chain and logistics under uncertainty
No full textThis research focuses on the applications of multi-stage stochastic models for global supply chain and logistics, especially in global production planning problems and international air cargo forwarding problems under uncertainties. We first exam a multi-period, multi-product and multi-plant production planning problem under uncertain demand and quota limitations and develop a multi-stage stochastic model to handle this problem. Then we present three types of robust models for the same problem: the robust optimization model with solution robustness, the robust optimization model with model robustness, and the robust optimization model with the trade-off between solution robustness and model robustness. Results show that multi-stage models will bring more benefits to their decision-makers.The second problem we look at is an international air cargo forwarding problem under uncertainty, which means the cargoes need to be transported from regions to destinations via a hub. The air forwarders not only have to make a decision about the number of containers to be booked for the regions and hub in advance before accurate customers’ information becomes available, but also have to decide the number of extra containers to be required or the containers to be returned after the realisation of uncertainty. We develop stochastic models and three types of robust models for one day’s flights per week and multi-days’ flights per week cases for this air cargo forwarding problem. For the large scale problem which means the computer software cannot give the optimal solution, we also present a new way to design the genetic algorithm to get the better solutions. Computational results show that the stochastic models can provide effective and cost-efficient solutions; the robust optimization models can provide a more responsive and flexible system with less risk
Production allocation for global manufacturing under import quota restriction and uncertainty
No full textProduction allocation, as a vital part of supply chain management, has inevitably been affected by the rapid development of globalization. Many domestic companies are facing greater competition from inter national companies than before. As a result, some governments pro vide some policies to protect their domestic companies, such as import quotas that is discussed in this research. Import quotas are extensively employed by various governments as a means of addressing perceived trade imbalances. With today’s increasingly competitive environment, many international companies, whose markets are located in Europe and North America, for example, decide to manufacture their prod ucts in developing countries, such as Vietnam, mainland China and Thailand. Their sales departments collect market information, which is continually changing, and their headquarters allocate production among their manufacturing plants in different regions and countries. Additionally, not all information for production allocation is known in advance makes decision-making more complicated. The headquarters have to allocate production among their manufacturing companies un der uncertain demand and quota limitation. In this research, a robust model is developed for global production allocation under demand un certainty and quota limitation. Numerical results and tests are carried out to demonstrate the effectiveness of the robust model
Developing a flexible decision support system for air cargo forwarding problems under uncertainty
No full textFig. 3 in Phortica eparmata species complex (Diptera, Drosophilidae) from the Oriental Region, with DNA barcoding information of Chinese species
No full textFig. 3. Phortica (Phortica) kava sp. nov., ♂. A. Arista. B. Epandrium and cercus. C. Surstylus. D. Hypandrium, paramere, aedeagus and aedeagal apodeme. Scale bars = 0.1 mm.Published as part of Zhu, Lin, Cao, Huiluo & Chen, Hongwei, 2018, Phortica eparmata species complex (Diptera, Drosophilidae) from the Oriental Region, with DNA barcoding information of Chinese species, pp. 1-18 in European Journal of Taxonomy 403 on page 9, DOI: 10.5852/ejt.2018.403, http://zenodo.org/record/117323
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Fig. 2 in Phortica eparmata species complex (Diptera, Drosophilidae) from the Oriental Region, with DNA barcoding information of Chinese species
No full textFig. 2. Phortica (Phortica) jadete sp. nov., ♂. A. Arista. B. Epandrium and cercus (lateral view). C. Surstylus (frontal view). D. Hypandrium, paramere, aedeagus and aedeagal apodeme (lateral views). E. Paramere (frontal view). F. Tip of aedeagal median rod (ventral view). Scale bars = 0.1 mm.Published as part of Zhu, Lin, Cao, Huiluo & Chen, Hongwei, 2018, Phortica eparmata species complex (Diptera, Drosophilidae) from the Oriental Region, with DNA barcoding information of Chinese species, pp. 1-18 in European Journal of Taxonomy 403 on page 8, DOI: 10.5852/ejt.2018.403, http://zenodo.org/record/117323
A stochastic model for the international air cargo forwarding problem via a hub under uncertainty
No full textVariations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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