Social Network Analysis

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Research Design: Qualitative, Quantitative, and Mixed Methods Approaches

[서평]「The Unified Modeling Language User Guide」

Past, present and future of mobile payments research: A literature review

Mobile banking adoption: A literature review

Mobile networking is developing and proliferating at a high speed. Many estimates say that the number of mobile telecom subscribers will exceed 1 billion in the year 2003. Among the terminals deployed, there will be hundreds of millions of Internet-enabled ones making Mobile Internet a reality for the big masses. The terminals and/or the mobile networks are now able to determine the position of the terminal on the earth with more and more precision. This is the basis for the new class of services called Location-Based Services (LBS). The paper discusses this new emerging application area that some people consider the central novel application class of Mobile Internet. The main topic of the paper is the question, how Geographic Information Systems (GIS) and the data hosted currently by them could be used in the context of LBS. We analyze their properties and relate them with the needs of LBS. We also present our LBS pilot system that is using XML-based vector formal for city maps and runs on Java-enabled mobile terminals, PDAs and smartphones.

Developing GIS-supported location-based services

We summarize most efforts on serendipity in recommender systems.We compare definitions of serendipity in recommender systems.We classify the state-of-the-art serendipity-oriented recommendation algorithms.We review methods to assess serendipity in recommender systems.We provide the future directions of serendipity in recommender systems. Recommender systems use past behaviors of users to suggest items. Most tend to offer items similar to the items that a target user has indicated as interesting. As a result, users become bored with obvious suggestions that they might have already discovered. To improve user satisfaction, recommender systems should offer serendipitous suggestions: items not only relevant and novel to the target user, but also significantly different from the items that the user has rated. However, the concept of serendipity is very subjective and serendipitous encounters are very rare in real-world scenarios, which makes serendipitous recommendations extremely difficult to study. To date, various definitions and evaluation metrics to measure serendipity have been proposed, and there is no wide consensus on which definition and evaluation metric to use. In this paper, we summarize most important approaches to serendipity in recommender systems, compare different definitions and formalizations of the concept, discuss serendipity-oriented recommendation algorithms and evaluation strategies to assess the algorithms, and provide future research directions based on the reviewed literature.

A survey of serendipity in recommender systems

In this paper, we describe developments towards the Internet of Things (IoT) and discuss architecture visions for the IoT. Our emphasis is to analyze the known and new threats for the security, privacy and trust (SPT) at different levels of architecture. Our strong view is that the IoT will be an important part of the global huge ICT infrastructure ("future Internet") humanity will be strongly relying on in the future with relatively few data centers connected to trillions of sensors and other "things" over gateways, various access networks and a global network connecting them. While the infrastructure is globally connected, it is divided into millions of management domains, such as homes, smart cities, power grids, access points and networks, data centers, etc. It will evolve both bottom-up and top-down. An important question is what consequences a bottom-up and top-down construction of the IoT infrastructure has for the security, privacy and trust and what kind of regulation is appropriate. We review the currently emerging privacy regulation in EU.

Security and privacy threats in IoT architectures

A method for integrated concurrency control and recovery, applicable to heterogeneous multidatabase systems, is proposed. The responsibility for two-phase local commitment and recovery of the prepared state at participants is taken over by an entity called 2PC Agent. The main importance of the method is in preserving global serializability in the presence of a certain class of participant-related failures. The related recovery methods, including a novel failure-time optimistic concurrency control method, are presented. >

Jari Veijalainen

Papers

Developing GIS-supported location-based services

A survey of serendipity in recommender systems

Security and privacy threats in IoT architectures

2PC Agent method: achieving serializability in presence of failures in a heterogeneous multidatabase

Transaction management for m-commerce at a mobile terminal