Jörn Altmann

Although there is much research on network formation based on the preferential attachment rule, the research did not come up with a formula that, on the one hand, can reproduce shapes of cumulative degree distributions of empirical complex networks and, on the other hand, can represent intuitively theories on individual behavior. In this paper, we propose a formula that closes this gap by integrating into the formula for the preferential attachment rule (i.e., a node with higher degree is more l

Based on a comprehensive literature survey, the constructs of the cybersecurity information sharing ecosystem have been defined in detail. Using this ecosystem, the interrelationships among the stakeholders with respect to cybersecurity information sharing are analyzed, the value parameters are determined, the value functions are defined, and the values obtained by the stakeholders through simulation are calculated. Furthermore, it is investigated whether the stakeholders involved in this ecosys

Within a closed ecosystem, end-users cannot interoperate with other platforms or port their software and data easily without a cost for interface integration or data re-formatting. The customers of these closed software service platforms are locked-in. Potential customers, who are aware of this lock-in issue, are hesitant to adopt a closed software service platform, slowing down the wide deployment of the software service platform. This paper applies an economic perspective to investigate the va

This paper describes a control mechanism for a future Internet. It is an economic mechanism that enables users to choose different pairs of price/QoS priority levels for network services at the user time scale. The user time scale means that prices vary at a rate suitable for human beings to respond to those price changes. The changes might happen on an hourly, daily, or weekly basis. We believe that such an economic control mechanism at a medium time scale, which is coupled with a technical rat

The current Internet service provider market does not offer different types of service plans for Internet access. The predominant pricing plan is a flat-rated plan. Since the number of new Internet users is still growing very fast, there is no real competition in the Internet market. Consequently, there is no incentive for Internet service providers (ISPs) to focus on certain user groups by offering more attractive pricing plans in order to differentiate themselves. However, as soon as the numbe

Article Free Access Share on Internet demand under different pricing schemes Authors: Jörn Altmann Department of Electrical Engineering & Computer Sciences, University of California at Berkeley Department of Electrical Engineering & Computer Sciences, University of California at BerkeleyView Profile , Björn Rupp Department of Electrical Engineering & Computer Sciences, University of California at Berkeley Department of Electrical Engineering & Computer Sciences, University of California at Berke

Many IT service platforms (e.g., cloud computing platforms) are built as closed systems. They do not allow their customers to interoperate with other platforms or port their data to other platforms. As switching to a different system is costly, customers of a closed IT system can be considered locked in. Consequently, potential customers, who are aware of this lock-in issue, do not adopt cloud services. Opening up an IT service platform, however, reduces users’ concerns about lock-in and its ass