The concept of group signature was first introduced by Chaum and van Heyst. They allowed individual members in a group to create signatures on behalf of the group. In this paper, we shall propose a new English auction scheme based on this concept by using the bulletin board system (BBS). The proposed scheme can satisfy the requirements of an ideal of English auction scheme as in Introduction.

For visualization of multivariable data, multivariate cube meets with the limitation of screen and human vision. Retinal variables are integrated into multivariate cube to enhance its visual characteristics. The selective feature of variables and associative feature of the values of the same variable are improved with the integration of retinal variable into the set of visual variables. The sel...

Resource allocation problems are concerned with the allocation of limited resources among competing activities so as to achieve the best overall performances. In this paper, we focus on approaches that attempt to allocate resources equitably among the competing activities. The problems of efficient and equitable resource allocation arise in various systems which serve many users, like in teleco...

along with improvement and expansion if computational communications and increasing access of various peoples to the internet and virtual social networks, a lot of theoretical endeavors have been spent for studying the internet and its political and social effects. during these attempts, the concept of public sphere in the framework of habermas's theory has a significant status. accordingl...

Metadata is data about data. It is considered an ideal and a very useful solution in describing/managing resources on the Internet. Especially, in the digital library field, metadata plays an important role for integrating digital resources and offering information service. However, from users standpoint, information service offered nowadays by any digital library is unable to satisfy their div...

Though there is evidence that presenting Android app permission information to the user in a clear, more contextdependent way can influence mobile phone users in choosing apps that request fewer permissions [4], ultimately users still tend to make poor privacy and security decisions, especially when warnings are unclear or inhibitive [1]. As a result, we believe that code developers should take...

We introduce the concept of information components and show how it can allow non-expert users to construct personal information spaces by selecting, customising and composing components defined by the system or other users. The system presented is based on a plug-andplay concept and new user-defined applications can be integrated into the portal-style interface based on default templates which ...

This chapter contains two main messages: First, the concept of the ‘digital divide’ should be seen as part of the problem rather than as part of the solution. Therefore, the sooner this concept-and with it the binary categories and the ‘one size fits all’ simplified model of ‘development’-is discarded the better. Second, the main recommendation for strategies to be adopted in ICT4D projects is ...

Greater speed is needed because of the desire to do larger and more complex problems, and greater accuracy is needed because, without it, there can be large errors in estimates of the impacts of plans and projects. The discussion below purposely limits technical detail so as to be accessible to a wide audience of users and managers, but there are numerous references that provide a full discussi...

The circuit board manufacturing community is now ready to embrace the concept of moving probe in-circuit test systems, also known as Flying Probers. This is due not only to the ability of Flying Probers to eliminate the cost of fixturing, but also to their new ability to satisfy the overall test requirements. This opens up the opportunity to test a new class of boards that are not cost effectiv...