380 Handel, Kommunikation, Verkehr
Refine
Year of publication
- 2013 (13) (remove)
Document Type
- Article (9)
- Book (2)
- Doctoral Thesis (1)
- Part of Periodical (1)
Has Fulltext
- yes (13)
Is part of the Bibliography
- no (13)
Keywords
- Buchhandel (1)
- Buchpreis (1)
- Customer Acquisition (1)
- Customer Management (1)
- Customer Referral Programs (1)
- Customer Value (1)
- Großbritannien (1)
- Heuristic (1)
- Loyalty (1)
- Non-linear cost (1)
Institute
The prize-collecting vehicle routing problem with single and multiple depots and non-linear cost
(2013)
In this paper, we propose a new routing problem to model a highly relevant planning task in small package shipping. We consider the Prize-Collecting Vehicle Routing Problem with Non-Linear cost in its single and multi-depot version, which integrates the option of outsourcing customers to subcontractors instead of serving them with the private fleet. Thereby, a lower bound on the total customer demand to be served by the private fleet guarantees a high utilization of the fleet capacity. To represent the practical situation, where a discount is given by a subcontractor if larger amounts of packages are outsourced, subcontracting costs follow a non-linear function. The considered problem is NP-hard and we propose an Adaptive Variable Neighborhood Search algorithm to solve instances of realistic size. We propose new benchmark sets for the single and the multi-depot problem, which are adapted from test instances of the capacitated VRP and the closely related Multi-Depot VRP with Private fleet and Common carrier. In numerical studies, we investigate the performance of our algorithm on the newly generated test instances and on standard benchmark problems of related problems. Moreover, we study the effect of different cost functions and different values of the minimal demand to be served by the private fleet on the routing solutions obtained.
Marginality does not mean isolation. In Africa where people are permanently on the move in search, inter alia, of a 'better elsewhere', marginality means disconnection to obvious possibilities and the invisibility of the myriad connections that make life possible for the ordinarily sidestepped. This book is about the workings of networks of the mobile in Africa, a continent usually associated with the 'global shadows' of the world. How do changes in the possibilities for communication, with the recent hype of mobile technology, influence the social and economic dynamics in Africa's mobile margins? To what extent is the freedom associated with new Information and Communication Technologies reality or disillusion for people dwelling in the margins? Are ordinary Africans increasingly Side@Ways? How social are these emergent Side@Ways? Contributions to answering these and related questions are harvested from ethnographic insights by team members of the WOTRO funded 'Mobile Africa revisited' research programme hosted by the African Studies Centre, Leiden, The Netherlands.
During the 1990s, as the Internet in general and e-mail in particular grew in popularity as a means of communication, a number of Cameroonians residing in various parts of the world established a vibrant and lively electronic forum for the discussion of various issues related to their native land. The forum, known as Camnet, demonstrated that Cameroonians living abroad could actively participate in the political, economic and social processes taking place at home. This ability to remain actively engaged in the development of one's nation through the Internet is what Endeley calls 'virtual activism.' Camnet thus distinguished itself as the first and most influential breeding ground for Cameroonian 'virtual activism.' Although Camnet appeared to be dominated by political discussions, it was a truly multi-dimensional forum. No topic was explicitly forbidden and on some occasions the participants conducted extensive debates on issues that had nothing to do with Cameroon or with politics. In this publication, however, the author has chosen to present only a representative sample of his own contributions from the late 1990s with a direct bearing on Cameroon's development. Some of the contributions are in French and in order to reflect the bilingual nature of the debates that took place on Camnet, these have not been translated into English. The informed reader will be struck by the issues which were being debated over 15 years ago as well as by the fact that some of the predictions the author made in the 1990s are a reality today.
Marketers increasingly use word of mouth to promote products or acquire new customers. But is such companystimulated WOM effective? Are customers who are referred by other customers really worth the effort? A recent study clearly says “yes”. In a study of almost 10,000 accounts at a German bank, the referred customers turned out to be 25 % more profi table than customers acquired by other means. Over a 33-month period, they generated higher profi t margins, were more loyal and showed a higher customer lifetime value. The difference in lifetime value between referred and non-referred customers was most pronounced among younger people and among retail (as opposed to private banking) customers. The reward of € 25 per acquired customer clearly paid off. Given the average difference in customer lifetime value of € 40, this amount implied a return on investment (ROI) of roughly 60 % over a six-year period. The encouraging results of this study, however, do not imply that “viral-for-hire” works in each and every case. Referral programs would be most beneficial for products and services that customers might not appreciate immediately. Products and services that imply some kind of risk would also benefit to a more than average degree from referrals because prospects are likely to feel more confi dent when a trusted person has positive experiences. Companies should consider carefully which prospects to target with referral programs and how large a referral fee to provide.
Können wir uns Wege sparen, weil wir immer mehr Aktivitäten in virtuelle Welten verlagern? Die Forschung konnte das bisher nicht bestätigen. Neue Kommunikationstechnologien führen aber zu einer stärkeren Durchdringung der physischen und der realen Welt. Das führt dazu, dass wir unsere Zeit noch effizienter nutzen können – im Zug arbeiten, im Wartezimmer einkaufen oder während eines Vortrags unsere Mails checken.
"Ich bin mit dem Pedelec zur Arbeit gekommen – das ist super. Ich fahre mit gutem Gewissen, komme relativ schweißfrei an und habe meine Portion Bewegung auch schon gehabt." Aussagen wie diese sind für die sozialwissenschaftliche Begleitforschung zur Elektromobilität wegweisend, denn sie zeigen, was Menschen dazu antreibt, auf umwelt- und ressourcenschonende Verkehrsmittel umzusteigen. Während im Bereich der Automobilität ein Durchbruch (noch) nicht in Sicht ist, erfreut sich das E-Bike zunehmender Beliebtheit.
Solarfassaden an Gebäuden, Elektroautos surren durch die Straßen, elektrische Lastenräder beliefern die Stadt: Das ist die Vision einer Zukunftsstadt im Jahre 2050. Aber welche konkreten Angebote können Städte und Gemeinden, die sich für saubere Elektromobilität engagieren wollen, ihren Bürgern und Unternehmen anbieten? Die Erfahrungen aus sechs europäischen Ländern zeigen, dass es bislang kaum übertragbare Patentrezepte gibt. Längerfristig Erfolg versprechend sind Projekte, die niedrigschwellige Angebote zur Erprobung der Elektromobilität im Alltag machen und auf die Mobilitätsbedürfnisse potenzieller Nutzerinnen und Nutzer eingehen.
Die elektromobile Zukunft hängt nicht nur von technischen Fortschritten der Automobilindustrie und den Ansprüchen potenzieller Käufer ab, sondern vom Gelingen vielfältiger Vernetzungen – mit anderen Mobilitätsangeboten und einer aus erneuerbaren Energien gespeisten Lade-Infrastruktur. Auch moderne Kommunikationsmittel spielen dabei eine Rolle. Eine Bestandsaufnahme von Joachim Pietzsch.