Single Subscription Research Articles

DSSPS: A dynamic secure service provision scheme in fog-based VANETs

In fog-based VANETs, fog nodes are close to the network edge that analyze data uploaded by vehicles, and then provide value-added services. It is suitable to adopt data sharing schemes to provide value-added services. However, applying existing data sharing schemes directly for service provision in fog-based VANETs has limitations in terms of security and efficiency. Therefore, we propose a dynamic secure service provision scheme in fog-based VANETs called DSSPS. Firstly, we construct an efficient subscription permission authentication mechanism that allows vehicles to request service from different fog nodes after a single subscription at TA. Secondly, a subgroup selecting algorithm is proposed, which effectively reduces the decryption overhead of vehicles. Formal security proof demonstrates DSSPS is secure. At the same time, DSSPS achieves better performance in terms of computation and communication costs.

A discrete choice experiment to evaluate the interest of Piedmont region citizens on MaaS

Recently an increasing number of goods and services tends to be offered as a service, of which one of the most promising is mobility. The Mobility as a Service (MaaS) paradigm provides the integration of most of the mobility services available within an urban/rural area in a single subscription. The interest of Piedmont Region citizens towards MaaS is investigated through a certain number of choice situations (DCE – Discrete Choice Experiment) in which the respondent must select an alternative from the given set, based on the characteristics of each alternative. To complete the survey, a number of classic questions (multiple choice and open-ended questions) is also submitted.The goal of the surveys is to understand the perception towards MaaS and identify the relevance of each modal alternative, to better design the composition of mobility bundles.The research showed that Piedmont citizens are strongly interested in MaaS solutions and that bundles with highest interest include Local Public Transport (LPT) as a base, with sharing services (car, bike, scooter) in urban areas and car rental or car-sharing in suburban areas.

VAT and Business Models for Charging Electric Vehicles

Electric vehicles will play an important role in the future of mobility. In this article, the author addresses the VAT consequences of business models that offer recharging services by multiple providers through a single subscription. According to the author, the current VAT consequences undermine these business models and a deeming provision creating a chain transaction should be implemented.

Optimal Subscription Planning for Digital Goods

We consider a media service provider that gives customers access to digital goods by either means of subscription fees or rentals. In our model, different types of users repeatedly use a platform over a period of time. The rate of usage varies across different customers. There are also multiple item types on the platform and the value of an item to a user depends on both the user type and the item type. The design of the platform's subscription planning comprises selecting a subscription fee for each set of goods and also selecting the rental price of each good. Before the beginning of the subscription period, given the subscription planning, users decide which set of goods to subscribe to (if any). During the subscription period, a user pays zero price to use an item if she has subscribed to a set that includes this item and pays its rental price, otherwise. Our first main result establishes the sufficient and necessary condition for the optimality of grand subscription-- offering rental prices together with a single subscription set that includes all items. Our second main result shows that without this condition, there exist subscription fees proportional to the cardinality of each set of goods that achieves $\frac{1}{4 (\log 2m+ \log n)}$ of the optimal revenue where $n$ and $m$ are the number of user types and item types, respectively. Finally, we show that this approximation is essentially tight by proving that no polynomial time algorithm can achieve a better than $\Omega(\frac{1}{\log n})$ of the optimal revenue.

Bundling, Reprinting, and Reframing: Serial Practices Across Borders

ABSTRACT This article explores the circulation of periodical material between metropolitan and regional locations in early twentieth-century North America. It asks how the globalized consumer technology of the household magazine was being taken up outside of cosmopolitan centers through the framework of local, regional, or national concerns. For example, mainstream Canadian monthlies such as The Western Home Monthly and Maclean's frequently engaged with, or re-used, content and formats taken from New York publications. To understand these transnational publishing dynamics, we argue, it is crucial to attend to the material practices of magazines. The article analyzes several such practices, including both editorial and sales strategies. We look at the reprinting or reframing of complete features and of excerpts from other periodicals. We examine the simultaneous serialization of novels in American and Canadian publications, using a case study of Martha Ostenso's Wild Geese. And we offer the first critical discussion of “bundling,” whereby US and Canadian titles were packaged together as a single subscription. It argues that the affordances of seriality, particularly timeliness and increased circulation through decreasing prices, allowed editors to redeploy metropolitan print materials for a regional readership eager to imagine themselves as participants in the new project of modernity.

The use patterns of physics journals in a large academic research library

AbstractThe purpose of this investigation was to reveal the use patterns of the physics journals in the M.I.T. Science Library. The findings are based upon an analysis of actual use data recorded from all volumes and issues left by library users on study tables and on trucks in the photocopy area from March 15 to June 31, 1971. The Science Library contains some 220 physics journals. The study reveals that only 138 journals (62.7%) were used even once during the 3 1/2‐month interval. A core of 49 journals supplies 90% of use, and these titles would cost 51.5% of the total single subscription costs of the 138 used titles: 52.3% of use occurs in journal volumes less than 6 years old. English is the most used language of physics journals and the English journals account for 95.3% of use. American journals, 57.2% of which are published by the American Institute of Physics, supply 59.4% of the total use.