Investigation into Mobile Learning Framework in Cloud Computing Platform

Abstract—Cloud computing infrastructure is increasingly used for distributed applications. Mobile learning applications deployed in the cloud are a new research direction. The applications require specific development approaches for effective and reliable communication. This paper proposes an interdisciplinary approach for design and development of mobile applications in the cloud. The approach includes front service toolkit and backend service toolkit. The front service toolkit packages data and sends it to a backend deployed in a cloud computing platform. The backend service toolkit manages rules and workflow, and then transmits required results to the front service toolkit. To further show feasibility of the approach, the paper introduces a case study and shows its performance

Properties of Catlin's reduced graphs and supereulerian graphs

A graph $G$ is called collapsible if for every even subset $R\subseteq V(G)$, there is a spanning connected subgraph $H$ of $G$ such that $R$ is the set of vertices of odd degree in $H$. A graph is the reduction of $G$ if it is obtained from $G$ by contracting all the nontrivial collapsible subgraphs. A graph is reduced if it has no nontrivial collapsible subgraphs. In this paper, we first prove a few results on the properties of reduced graphs. As an application, for 3-edge-connected graphs $G$ of order $n$ with $d(u)+d(v)\ge 2(n/p-1)$ for any $uv\in E(G)$ where $p>0$ are given, we show how such graphs change if they have no spanning Eulerian subgraphs when $p$ is increased from $p=1$ to 10 then to $15$

Optical Signal Processing for High-Order Quadrature- Amplitude Modulation Formats

In this book chapter, optical signal processing technology, including optical wavelength conversion, wavelength exchange and wavelength multicasting, for phase-noise-sensitive high-order quadrature-amplitude modulation (QAM) signals will be discussed. Due to the susceptibility of high-order QAM signals against phase noise, it is imperative to avoid the phase noise in the optical signal processing subsystems. To design high-performance optical signal processing subsystems, both linear and nonlinear phase noise and distortions are the main concerns in the system design. We will first investigate the effective monitoring approach to optimize the performance of wavelength conversion for avoiding undesired nonlinear phase noise and distortions, and then propose coherent pumping scheme to eliminate the linear phase noise from local pumps in order to realize pump-phase-noise-free wavelength conversion, wavelength exchange and multicasting for high-order QAM signals. All of the discussions are based on experimental investigation

The existence and uniqueness of the steady equilibrium in the endogenous economic growth model

Without the assumption on the factor linear growth equation and keeping other assumptions in the endogenous growth theory, we prove the growth rate and interest rate endogenous, and then we give general conditions for the existence and uniqueness of the growth rate. Under the condition of the constant returns to scale, the growth rate of every variable and interest rate are constant in the steady state. In addition, we give primary analyses on the stochastic economy with growth

Diacetato{4′-[4-(benz­yloxy)phen­yl]-2,2′:6′,2′′-terpyridine}zinc(II)

In the title compound, [Zn(CH3COO)2(C28H21N3O)], the ZnII ion is in a trigonal–bipyramidal ZnN3O2 coordination with a tridentate N-chelating 4′-[4-(benz­yloxy)phen­yl)-2,2′:6′,2′′-terpyridine ligand in the equatorial position and two acetate anions in the axial positions. The three pyridine rings are approximately coplanar, with a maximum deviation of 0.03 Å from the mean plane. The phen­oxy substituent makes a dihedral angle of 18.1 (2)° with the central pyridine ring. The benzyl group has a C—O—C—C torsion angle of 77.62 (8)° relative to the phen­oxy ring. In the crystal, mol­ecules are linked via C—H⋯O hydrogen bonds