This study presents the findings of a new financial risk system (FRS) with one absolute function and two quadratic nonlinearities. The rich dynamic behaviors of the new financial risk system are discussed analytically and numerically through stability analysis, phase portrait, bifurcation diagram, Lyapunov exponent, multistability and coexisting attractors. In addition, a new financial risk system with two quadratic nonlinear-ities and one absolute function shows multistability and coexistence of chaotic attractors. Using adaptive feedback control, we established a new control law for fully synchronising the proposed chaotic financial systems with itself. To conclude, some numerical simulation was presented using MATLAB to illustrate the efficiency of the designed method.

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The study of centrality measurement is still a developing topic recently. Centrality measures can also be applied to palapa networks. In this study, it was determined which city in the connected eastern palapa ring optic fiber network II which had the highest centrality compared to other cities. The calculation is done by measuring four types of centralities, namely degree, closeness, betweenness, and eigenvector. Calculations are done using Python software, and its syntax are given in this paper. The four centrality results from each type are compared and as a result, the most important cities in this eastern palapa ring optic fiber network II are obtained.