Evolving Social Networks via Friend Recommendations

A social network grows over a period of time with the formation of new connections and relations. In recent years we have witnessed a massive growth of online social networks like Facebook, Twitter etc. So it has become a problem of extreme importance to know the destiny of these networks. Thus predicting the evolution of a social network is a question of extreme importance. A good model for evolution of a social network can help in understanding the properties responsible for the changes occurring in a network structure. In this paper we propose such a model for evolution of social networks. We model the social network as an undirected graph where nodes represent people and edges represent the friendship between them. We define the evolution process as a set of rules which resembles very closely to how a social network grows in real life. We simulate the evolution process and show, how starting from an initial network, a network evolves using this model. We also discuss how our model can be used to model various complex social networks other than online social networks like political networks, various organizations etc..Comment: 5 pages, 8 figures, 2 algorithm

A General Method for Selecting Quantum Channel for Bidirectional Controlled State Teleportation and Other Schemes of Controlled Quantum Communication

Recently, a large number of protocols for bidirectional controlled state teleportation (BCST) have been proposed using $n$-qubit entangled states ($n\in\{5,6,7\}$) as quantum channel. Here, we propose a general method of selecting multi-qubit $(n>4)$ quantum channels suitable for BCST and show that all the channels used in the existing protocols of BCST can be obtained using the proposed method. Further, it is shown that the quantum channels used in the existing protocols of BCST forms only a negligibly small subset of the set of all the quantum channels that can be constructed using the proposed method to implement BCST. It is also noted that all these quantum channels are also suitable for controlled bidirectional remote state preparation (CBRSP). Following the same logic, methods for selecting quantum channels for other controlled quantum communication tasks, such as controlled bidirectional joint remote state preparation (CJBRSP) and controlled quantum dialogue, are also provided.Comment: 8 pages, no figur

Higher order nonclassicalities of finite dimensional coherent states: A comparative study

Conventional coherent states (CSs) are defined in various ways. For example, CS is defined as an infinite Poissonian expansion in Fock states, as displaced vacuum state, or as an eigenket of annihilation operator. In the infinite dimensional Hilbert space, these definitions are equivalent. However, these definitions are not equivalent for the finite dimensional systems. In this work, we present a comparative description of the lower- and higher-order nonclassical properties of the finite dimensional CSs which are also referred to as qudit CSs (QCSs). For the comparison, nonclassical properties of two types of QCSs are used: (i) nonlinear QCS produced by applying a truncated displacement operator on the vacuum and (ii) linear QCS produced by the Poissonian expansion in Fock states of the CS truncated at (d-1)-photon Fock state. The comparison is performed using a set of nonclassicality witnesses (e.g., higher order antiubunching, higher order sub-Poissonian statistics, higher order squeezing, Agarwal-Tara parameter, Klyshko's criterion) and a set of quantitative measures of nonclassicality (e.g., negativity potential, concurrence potential and anticlassicality). The higher order nonclassicality witness have found to reveal the existence of higher order nonclassical properties of QCS for the first time.Comment: A comparative description of the higher-order nonclassical properties of the finite dimensional coherent state

Computerised model for materials handling in a large mineral processing based organization

Integrated Information Technology applications related to Materials Handling have been advocated for a long time. For many large organizations, the challenges have been to monitor material flow, traceability of material, accurate weighment and ensuring that the transportation of the material is as per schedule and at optimum cost. It is important that the Suppliers/Transporters payments are to be made timely. The objective of the paper is to address the above mentioned issues in this area on how a computer-ised model implemented over a Wide Network can improve productivity. The challenges lie in improving operations involving diversified users spread over large areas, oper-ating on machines with different configurations, affecting the overall system objectives. The system will be useful in standardisation of operations, having information on material flow at finger tips and automatic recording of weighment apart from generating various MIS reports for production Planning/ Scheduling. It will help users in taking on-line decisions. The System will also aid in red-ucing bill processing cycle time thus leading to financial benefits and better organizational image. The above model with minor refinement can be used in any Mineral Process-ing Organization

A Study discussing the future outlook of REITs after the REIT modernization act

Real Estate Investment Trust, which originated in 1960, gained popularity since 1991, when a large number of real estate companies went public. Paired Share structure, has been underscored throughout this thesis, as the whole research was limited to few companies named Starwood, Patriot American, Meditrust, and First Union who used this structure aggressively to acquire corporations. Paired Share REIT Structure refers to the REIT and a C-corporation being traded together under one symbol in the stock market. So, the investors get the combined profits from both the companies, which makes this structure extremely popular among the shareholders. Paired Share REIT Structure was abolished in 1984 because of the abuse of tax system. But the government allowed 5 existing Paired Share REITs to continue. This grandfathered status gave this five companies an advantage over all other REITs as well as non-REITs. Therefore, the only way to become a Paired Share REIT was to acquire one of these five existing Paired Share corporations. This study is strictly a Finance Topic, which discusses cognitive dissonance between REITs with Paired Share structure and REITs with no Paired Share structure as well as non-REITs. As this topic needs a highly specialized knowledge, therefore the size of the survey population was selected to be small. The questionnaire was designed with the assistance of Mr. Todd Dunda, Director of Finance for Marriott International. The survey was conducted in August 1999, administrated to Real Estate Analysts, Finance Officials working with REITs and non-REITs and the data was finally analyzed one question at a time in a very streamlined fashion by projecting coherent grouping of the answers by all the candidates. Marriott International and Hilton Hotels raised their voices when they saw Starwood Hotels winning the bid on ITT Sheraton Inc. Starwood raised $13.3 billion through their paired share structure. Hilton, who could only raise$8.3 billion lost the battle. This study took more than one year, as I was waiting for the results for the appeal in front of Congress to abolish the Paired Share Structure completely. REIT Modernization Act was introduced in August 1999, which strictly ruled out any more acquisitions under a Paired Share Structure. The companies could maintain their Paired Share formats, but they were not allowed to acquire companies. The Share Prices for these Paired Share Companies fell down by more than 50%. Patriot American was close to Bankruptcy. Starwood managed to survive by converting into a C-corporation. The moral of this story is that Maintaining a Balance Sheet is equally important as expanding your company limits