Rentable Internet of Things Infrastructure for Sensing as a Service (S2aaS)

Sensing as a Service (S2aaS) model [1] [2] is inspired by the traditional Everything as a service (XaaS) approaches [3]. It aims to better utilize the existing Internet of Things (IoT) infrastructure. S2aaS vision aims to create 'rentable infrastructure' where interested parties can gather IoT data by paying a fee for the infrastructure owners

A multiplicity result for the scalar field equation

We prove the existence of $N - 1$ distinct pairs of nontrivial solutions of the scalar field equation in ${\mathbb R}^N$ under a slow decay condition on the potential near infinity, without any symmetry assumptions. Our result gives more solutions than the existing results in the literature when $N \ge 6$. When the ground state is the only positive solution, we also obtain the stronger result that at least $N - 1$ of the first $N$ minimax levels are critical, i.e., we locate our solutions on particular energy levels with variational characterizations. Finally we prove a symmetry breaking result when the potential is radial. To overcome the difficulties arising from the lack of compactness we use the concentration compactness principle of Lions, expressed as a suitable profile decomposition for critical sequences

The (unknown) role of map librarian and the challenge of satisfying the cartographic user needs

The (unknown) role of map librarian and the challenge of satisfying the cartographic user needs The profession of librarianship is developed and is being recognized in Sri Lanka. But we have neither heard of a map library nor a map librarian in our local environment. In Europe and USA map libraries are well known and map librarians are recognized Librarians who deal with maps come under the special library group and have to manage the map collection in a special manner. It needs specialized knowledge in managing map collection. Reading of maps needs technical equipments and storage and preservation too is different from books. Hence the librarian who deals with maps should undergo training to familiarize himself/herself with the technical methods of storage, search co ordination and manage archives and enhance access of cartographic materials. After world War 11 traditional map depositories are converted into cartographic centres and new technology is heavily used in map production, storage and usage. This paper highlights the role to be played by map librarians in a modern library using new technologies. Map users are very much advanced in using different type of technologies in reading, creating, copying etc.maps. This technological advancement has not caused much change in map collection in the developing countries. Even in the 21st century we see the traditional collection of maps in Sri Lanka. . While studying the situation (advance collection and advance users) in other countries, a sample study was carried out with reference to the local environment by selecting academic and special library groups. This paper elucidates the role played by a librarian who handle maps, who is not recognized as a map librarian It also discuses the attitudes of the cartographic users towards map libraries in our country the institutions where map collections are available, the barriers experienced by the users in accessing the collections, important issues neglected by the higher authorities and lack of a national body to authorize map production in the country. The role that could be played by the national body or a regulatory body such as management of collection and databases, setting of standards, copyright law and implementing a national policy in map production and the problems faced in producing maps are discussed. The study reveals that the gap between the traditional map libraries (collection) and the users of cartographic material is widening. The author suggests that the librarians could overcome this problem by undergoing professional training. This will change the attitude of the users towards the map librarians and map libraries. This will give recognition to the professionals who work as map librarians

Signal Flow Graph Approach to Efficient DST I-IV Algorithms

In this paper, fast and efficient discrete sine transformation (DST) algorithms are presented based on the factorization of sparse, scaled orthogonal, rotation, rotation-reflection, and butterfly matrices. These algorithms are completely recursive and solely based on DST I-IV. The presented algorithms have low arithmetic cost compared to the known fast DST algorithms. Furthermore, the language of signal flow graph representation of digital structures is used to describe these efficient and recursive DST algorithms having $(n-1)$ points signal flow graph for DST-I and $n$ points signal flow graphs for DST II-IV