We study the market for apps on Facebook, the dominant social networking platform, and make use of a rule change by Facebook by which highly engaging apps were rewarded with further opportunities to engage users. The rule change led to new applications with significantly higher user ratings being developed. Moreover, user ratings became more important drivers of app success. Other drivers of ap...

MC-CDMA is the most promising technique for high bit rate and high capacity transmission in wireless communication. One of the challenging issues of MC-CDMA system is very high PAPR due to large number of sub-carriers which reduces the system efficiency. This paper describes the various PAPR reduction techniques for MC-CDMA system. Criterion for the selection of PAPR reduction technique and als...

High peak to average power ratio of the transmit signal is a major drawback of OFDM systems. After defining the PAPR and analyzing its statistical properties, some of the most representative PAPRreduction techniques available in the literature are reviewed in detail. Several methods have been proposed to reduce the peak power of OFDM signals. In this paper the effectiveness of some recently pro...

Let n points be chosen randomly and independently in the unit disk. “Sylvester’s question” concerns the probability pn that they are the vertices of a convex n-sided polygon. Here we establish the link with another problem. We show that for large n this polygon, when suitably parametrized by a function r(φ) of the polar angle φ, satisfies the equation of the random acceleration process (RAP), d...

The main purpose of this paper is to give a simple and non-combinatorial proof of the toric Mori theory. Here, the toric Mori theory means the (log) Minimal Model Program (MMP, for short) for toric varieties. We minimize the arguments on fans and their decompositions. We recommend this paper to the following people: (A) those who are uncomfortable with manipulating fans and their decompositions...

The growing interests in the Internet and WWW attempt to extend the field of study from stand alone learning environment to collaborative or cooperative learning environment. In the light of recent explosive growth of information communication technology, the common platform for collaborative or cooperative activities should be discussed and considered in international community. Additionally, ...

This paper investigates the large-scale diffusion of a collaborative technology in a range of different business contexts. The empirical data used in the article were obtained from a longitudinal (2007–2009) case study of a global oil and gas company (OGC). Our study reports on ongoing efforts to deploy an integrated collaborative system that uses Microsoft SharePoint (MSP) technology. We asses...