24 results found
Zamyatin A, Wolter K, Werner S, et al., 2017, Swimming with Fishes and Sharks: Beneath the Surface of Queue-Based Ethereum Mining Pools, Pages: 99-109
© 2017 IEEE. Cryptocurrency mining can be said to be the modern alchemy, involving as it does the transmutation of electricity into digital gold. The goal of mining is to guess the solution to a cryptographic puzzle, the difficulty of which is determined by the network, and thence to win the block reward and transaction fees. Because the return on solo mining has a very high variance, miners band together to create so-called mining pools. These aggregate the power of several individual miners, and, by distributing the accumulated rewards according to some scheme, ensure a more predictable return for participants.In this paper we formulate a model of the dynamics of a queue-based reward distribution scheme in a popular Ethereum mining pool and develop a corresponding simulation. We show that the underlying mechanism disadvantages miners with above-average hash rates. We then consider two-miner scenarios and show how large miners may perform attacks to increase their profits at the expense of other participants of the mining pool. The outcomes of our analysis show the queue-based reward scheme is vulnerable to manipulation in its current implementation.
Berti G, Mulligan C, 2016, Competitiveness of Small Farms and Innovative Food Supply Chains: The Role of Food Hubs in Creating Sustainable Regional and Local Food Systems, Sustainability, Vol: 8, Pages: 616-616
Spanaki K, Adams R, Mulligan C, et al., 2016, Data Supply Chain (DSC): development and validation of a measurement instrument, 23rd EurOMA Conference
The volume and availability of data produced and affordably stored has become animportant new resource for building organizational competitive advantage. Reflectingthis, and expanding the concept of the supply chain, we propose the Data Supply Chain(DSC) as a novel concept to aid investigations into how the interconnected datacharacteristics relate to and impact organizational performance. Initially, we define theconcept and develop a research agenda on DSC coupling theoretical background ofstrategy and operations literature. Along with the conceptualization, we develop a set ofpropositions and make suggestions for future research including testing and validatingthe model fit.
Spanaki K, Adams R, Mulligan C, et al., 2016, A Research Agenda on Data Supply Chains (DSC), British Academy of Management (BAM) Conference
Competition among organizations supports initiatives and collaborative use of data whilecreating value based on the strategy and best performance of each data supply chain.Supporting this direction, and building on the theoretical background of the supply chain, wepropose the Data Supply Chain (DSC) as a novel concept to aid investigations for data-drivencollaboration impacting organizational performance. In this study we initially propose adefinition for the DSC paying particular attention to the need for collaboration for the supplychains of data. Furthermore, we develop a conceptual model of DSC collaboration couplingtheoretical background of strategy and operations literature including, the resource-basedview (RBV), supply chain management (SCM) and collaboration (SCC). Finally, we setpropositions and a future research agenda including testing and validating the model fit.
Mulligan CEA, Tsiatsis V, Karnouskos S, et al., 2014, Machine-2-Machine and IoT Technologies, ISBN: 9780124076846
Mulligan CEA, Olsson M, 2013, Architectural Implications of Smart City Business Models: An Evolutionary Perspective, IEEE Communications Magazine, Vol: 51
Smart cities have rapidly become a hot topic within technology communities, and promise both improved delivery of services to end users and reduced environmental impact in an era of unprecedented urbanization. Both large hightech companies and grassroots citizen-led initiatives have begun exploring the potential of these technologies. Significant barriers remain to the successful rollout and deployment of business models outlined for smart city applications and services, however. Most of these barriers pertain to an ongoing battle between two main schools of thought for system architecture, ICT and telecommunications, proposed for data management and service creation. Both of these system architectures represent a certain type of value chain and the legacy perspective of the respective players that wish to enter the smart city arena. Smart cities services, however, utilize components of both the ICT industry and mobile telecommunications industries, and do not benefit from the current binary perspective of system architecture. The business models suggested for the development of smart cities require a longterm strategic view of system architecture evolution. This article discusses the architectural evolution required to ensure that the rollout and deployment of smart city technologies is smooth through acknowledging and integrating the strengths of both the system architectures proposed.
Mulligan CEA, Jakobsson S, Unmehopa M, 2012, Research and reality: The evolution of Open Network API standards, Communications (ICC), 2012 IEEE International Conference, ISSN: 1550-3607
This document investigates the evolution of the Open Network Application Programming Interfaces (APIs) from a research and industrial perspective over the last 15 years. It provides insight into the work currently ongoing in the Open Mobile Alliance (OMA) and GSM Association (GSMA) with regards to creating developer friendly APIs and delivering them to the market. Finally, it outlines the current research ongoing within the Open API sphere and provides some recommendations for the standardization forums of the communications industries in order to more fully align with this work.
Olsson M, Mulligan CEA, Frid L, et al., 2012, Epc and 4g Packet Networks: Driving the Mobile Broadband Revolution, Publisher: Academic Press, ISBN: 9780123945952
This book - a new edition of SAE and the Evolved Packet Core - provides clear, concise and comprehensive coverage of the entire SAE/ EPC architecture, explaining concepts and standards and how they are used in commercial service settings.
Mortier R, Mulligan CEA, 2011, ., Platforms in the palm of your hand: Mobile value chain evolution, Intelligence in Next Generation Networks (ICIN), 2011: 15th International Conference
Mulligan C, 2011, The Communications Industries in the Era of Convergence, Publisher: Routledge, ISBN: 9780415584845
This book provides a unique view of the evolution of these industries, drawing out how technology and economic forces have worked together to create platforms around which different companies interact.
Mulligan CEA, 2011, Making sense of the new data streams, Publisher: Ericsson Business Review
Mulligan CEA, Arup, Accenture, et al., 2011, Information Marketplaces: The new economics of cities
Mulligan CEA, Mortier R, Houghton R, et al., 2011, Standardisation strategies for the android platform: The Politics of the stack, Intelligence in Next Generation Networks (ICIN), 2011: 15th International Conference
Noldus R, Olsson U, Mulligan C, et al., 2011, IMS Application Developer's Handbook, Publisher: Academic Press, ISBN: 9780123821935
The authors of this book bring their in-depth and extensive knowledge in the organizations involved in the IMS standardization and its architecture.
Holm T, Mulligan CEA, Nordin H, 2010, Facilitating subscription services in the IMS
A method of starting a third party application subscription in a set of Application Servers located within an IP Multimedia Subsystem network. The method comprises receiving a subscription start request at one of said Application Servers, the request including subscription data
Mulligan C, olsson M, 2010, Inter-access network topology discovery, US 7940726
Mulligan C, 2009, Open API standardization for the NGN platform, IEEE Communications Magazine, Vol: 47, Pages: 108-113, ISSN: 0163-6804
Mulligan C, Olsson M, Olsson U, 2009, Method, a Media Server, Computer Program and Computer Program Product For Combining a Speech Related to a Voice Over IP Voice Communication Session Between User Equipments, in Combination With Web Based Applications
Olsson M, Sultana S, Rommer S, et al., 2009, SAE and the Evolved Packet Core: Driving the Mobile Broadband Revolution, ISBN: 9780123748263
Up-to-date coverage of SAE including the latest standards development.
Mulligan CEA, 2008, Embracing Open Source Methods for the Standardization of NGN Services and Enablers, NGMAST '08 Proceedings of 2008: The Second International Conference on Next Generation Mobile Applications, Services, and Technologies, pp 628-633
Brooks A, Utbult F, Mulligan CEA, et al., 2000, Early Lifecycle Work: Influence of Individual Characteristics, Methodological Constraints, and Interface Constraints, Journal of Empirical Software Engineering, Vol: 3, Pages: 269-285
Mulligan CEA, Briscoe G, Fullarton Pegg F, et al., Designing Future Economies: Boundary Objects for Visualising Sustainable Innovation, International Journal for Art and Design Education Conference
Mulligan CEA, Fullarton Pegg F, Briscoe G, et al., Artefact as Bridging Concept for Designing Future Economics, ACM Computer-Human Interaction
Mulligan CEA, spanaki D, Gurguc Z, et al., Data Supply Chain (DSC): Research Synthesis and Future Directions, International Journal of Production Research, ISSN: 0020-7543
This data is extracted from the Web of Science and reproduced under a licence from Thomson Reuters. You may not copy or re-distribute this data in whole or in part without the written consent of the Science business of Thomson Reuters.