L2L_2-Box Optimization for Green Cloud-RAN via Network Adaptation

In this paper, we propose a reformulation for the Mixed Integer Programming (MIP) problem into an exact and continuous model through using the $\ell_2$-box technique to recast the binary constraints into a box with an $\ell_2$ sphere constraint. The reformulated problem can be tackled by a dual ascent algorithm combined with a Majorization-Minimization (MM) method for the subproblems to solve the network power consumption problem of the Cloud Radio Access Network (Cloud-RAN), and which leads to solving a sequence of Difference of Convex (DC) subproblems handled by an inexact MM algorithm. After obtaining the final solution, we use it as the initial result of the bi-section Group Sparse Beamforming (GSBF) algorithm to promote the group-sparsity of beamformers, rather than using the weighted $\ell_1 / \ell_2$-norm. Simulation results indicate that the new method outperforms the bi-section GSBF algorithm by achieving smaller network power consumption, especially in sparser cases, i.e., Cloud-RANs with a lot of Remote Radio Heads (RRHs) but fewer users.Comment: 4 pages, 4 figure

On the Asymptotics of Graph Cut Objectives for Experimental Designs of Network A/B Testing

A/B testing is an effective way to assess the potential impacts of two treatments. For A/B tests conducted by IT companies, the test users of A/B testing are often connected and form a social network. The responses of A/B testing can be related to the network connection of test users. This paper discusses the relationship between the design criteria of network A/B testing and graph cut objectives. We develop asymptotic distributions of graph cut objectives to enable rerandomization algorithms for the design of network A/B testing under two scenarios

Comprehensive Analysis on Seismic Design of Tall Building Structure Method

For a high-rise structure design, the problems encountered may be perplexing, concrete analysis of concrete problems only. Engineering practice shows that the design process of the high-rise structure, design personnel only seismic conceptual clarity, structure measure analysis software three organic combinations to achieve more satisfactory results in the process of seismic structural weight in structure calculation structure properly applying the appropriate. This paper makes a theoretical analysis of necessity for building seismic design concept, in order to explore the method of high-rise building to take the necessary anti-seismic measures

The Labour Market Effect of Social Security in Germany

This paper investigates the relationship between social security and laobour market in Germany and calculates the regression relation among social security expenditure,social security contribution,enterprise investment and unemployment rate.The results Indicated that the labour market has a closed relevance with social security. Reducing the social security contribution of enterprise is an important means to control the unemployment.And the proper level social security expenditure is the most crucial factor to keep the beneficial cycle between social security and laobour market . Key words: Social Security Contribution; Social Security Expenditure; Labour Marke