The problem of cooperative spectrum leasing to unlicensed Internet of Things (IoT) devices is studied to account for potential selfish behavior of these devices. A distributed game theoretic framework for spectrum leasing is proposed where the licensed users can willingly lease a portion of their spectrum access to unlicensed IoT devices, and in return the IoT devices provide cooperative servic...

Various home robots like sweeping robots and pet robots have been developed, commercialized and now are studied for use in cooperative housework (Kobayashi & Yamada, 2005). In the near future, cooperative work of a human and a robot will be one of the most promising applications of Human-Robot Interaction research in factory, office and home. Thus interaction design between ordinary people and ...

Multiple secondary users can cooperate to increase the reliability of spectrum sensing in cognitive radio (CR) networks. However, the total transmission power grows approximately linearly with the number of cooperative secondary users. This study proposes a new approach to optimise the trade-off between sensing reliability and power efficiency in cooperative CR networks over fading channels. Th...

The use of orthogonal signaling schemes such as time-, frequency-, or code-division multiplexing (T-, F-, CDM) in multi-user systems allows for power-efficient simple receivers. It is shown in this paper that by using orthogonal signaling on frequency selective fading channels, the cooperative Nash bargaining (NB)-based precoding games for multi-user systems, which aim at maximizing the informa...

In this paper we present a new cooperative transaction model. The model has been developed using a data-driven approach, where we have not considered constraints specific to one application class, but only data-specific constraints. This approach is more general than the application-driven approach adopted in other cooperative transaction models. The notion of set of complementary objects is in...

The paper presents a user interface toolkit to support the construction of cooperative multiuser interfaces. The toolkit is based on the configuration of shared interface objects to construct cooperative interfaces. A principal focus of the toolkit is the provision of accessible facilities to manage interface configuration and tailoring. Most existing facilities to manage multiuser interfaces t...

Introduction Database systems are computerized systems for managing large amounts of data. Their principal function is to process requests from users to retrieve or alter the data they store. Traditionally, such requests must be expressed in a formal query language. Requests that are well defined are performed promptly; other requests are declined. Processing requests for information is also a ...

While cooperative communication has many benefits and is expected to play an important role in future wireless networks, many challenges are still unsolved. Previous research has developed different relaying strategies for cooperative multiple access channels (CMA), cooperative multiple relay channels (CMR) and cooperative broadcast channels (CBC). However, there lacks a unifying strategy that ...

Because of the gains like diversity, throughput, and the coverage extension provided by the multiple-input multipleout (MIMO) systems, it has been part of the various wireless communications standards. However, to reap the benefits offered by MIMO systems in size-constrained nodes, used in wireless communications, has been a challenging issue. To address this challenge, cooperative communicatio...