Three-dimensional analysis of the surface mode supported in \v{C}erenkov and Smith-Purcell free-electron lasers

In \v{C}erenkov and Smith-Purcell free-electron lasers (FELs), a resonant interaction between the electron beam and the co-propagating surface mode can produce copious amount of coherent terahertz (THz) radiation. We perform a three-dimensional (3D) analysis of the surface mode, taking the effect of attenuation into account, and set up 3D Maxwell-Lorentz equations for both these systems. Based on this analysis, we determine the requirements on the electron beam parameters, i.e., beam emittance, beam size and beam current for the successful operation of a \v{C}erenkov FEL

HT-Paxos: High Throughput State-Machine Replication Protocol for Large Clustered Data Centers

Paxos is a prominent theory of state machine replication. Recent data intensive Systems those implement state machine replication generally require high throughput. Earlier versions of Paxos as few of them are classical Paxos, fast Paxos and generalized Paxos have a major focus on fault tolerance and latency but lacking in terms of throughput and scalability. A major reason for this is the heavyweight leader. Through offloading the leader, we can further increase throughput of the system. Ring Paxos, Multi Ring Paxos and S-Paxos are few prominent attempts in this direction for clustered data centers. In this paper, we are proposing HT-Paxos, a variant of Paxos that one is the best suitable for any large clustered data center. HT-Paxos further offloads the leader very significantly and hence increases the throughput and scalability of the system. While at the same time, among high throughput state-machine replication protocols, HT-Paxos provides reasonably low latency and response time

Linked Data: a best practice for better knowledge transaction

In recent years there has been much spoken, written and published about the semantic web. The main goal of this future web is to make it understandable to the machines. The traditional web is taken as a global document space where the documents are interlinked by using the hypertext links. The big question of interlinking data is still there. The fundamental prerequisite of the semantic web is the existence of large amount of meaningfully interlinked RDF data on the web. To date this prerequisite has not been widely met, leading to criticism of the broader endeavour and hindering the progress of developers wishing to build Semantic Web applications. Currently many attempts are going on to bring this data on Web like the Open Data movement which tries to bring the royalty free datasets into RDF data and interlinks them. Linked Data is about using the Web to connect related data that wasn’t previously linked, or using the Web to lower the barriers to linking data currently linked using other methods. These best practices could lead to better knowledge transactions in the future. This paper discusses the concept and technical principles of Linked Data by describing the underlying architecture, tools and frameworks available in the context of Linked Data

Next Generation Catalogue: A User’s expectation

Paper presented at International CALIBERSince the days of Cutter, tools to access the resources of libraries are changing their structure and interface rapidly and dramatically to fulfill the dynamic user needs. Today almost every library user comes with expectations set and defined by their experience of using the Web. So the catalogues, which are offered by the libraries, need to operate at the same level of sophistication as other popular Web destinations. The “next generation” library catalog is a tool designed to fit into this shifting environment and move librarianship into a more active role when it comes to increasing the sphere of knowledge. The purpose of the paper to examine the present developments and explores the likely future developments in re-designing the OPAC to support resource discovery. The different ongoing developments follow a unique approach, but one thread that is common in all of them is that they involve a desire to go far beyond the capabilities of legacy catalogues and give library users more powerful and appealing tools