Abstract The angular synchronization problem of estimating a set unknown angles from their known noisy pairwise differences arises in various applications. It can be reformulated as an optimization on graphs involving the graph Laplacian matrix. We consider general, weighted version this problem, where impact noise differs between different pairs entries and some are erased completely; for exam...

Neural networks have become standard tools in the analysis of data, but they lack comprehensive mathematical theories. For example, there are very few statistical guarantees for learning neural from especially classes estimators that used practice or at least similar to such. In this paper, we develop a general guarantee consist least-squares term and regularizer. We then exemplify with ?1-regu...

Abstract Neural networks are becoming increasingly popular in applications, but our mathematical understanding of their potential and limitations is still limited. In this paper, we further by developing statistical guarantees for sparse deep learning. contrast to previous work, consider different types sparsity, such as few active connections, nodes, other norm-based sparsity. Moreover, theori...

It is well established that equity issuance for most non-financial firms is procyclical. This paper shows that, in contrast, equity issuance for banks is countercyclical across credit cycles after 1980, as is retained income. Thus, during credit booms, banks raise less equity, even though more equity might help banks better absorb shocks. This paper shows that government guarantees play a cruci...

Informal financial services (IFSs) provide various types of investment avenues for both rural and urban populations in Zambia. This paper is a critical review the sustainability informal typologies Zambians has been using adopting to increase their resources solve livelihoods social issues process. An evaluation why people organizations opt specific that come form savings lending groups will be...

Existing finance literature is inadequate with respect to its coverage of the capital structure of small and medium sized enterprises (SMEs). This lack of coverage means that SMEs are provided with little or no guidance for optimising their cost of capital. This paper is an attempt to provide such guidance. For unlisted SMEs the cost of equity cannot be derived from the capital market, nor can ...

Existing finance literature is inadequate with respect to its coverage of the capital structure of small and medium sized enterprises (SMEs). This lack of coverage means that SMEs are provided with little or no guidance for optimising their cost of capital. This paper is an attempt to provide such guidance. For unlisted SMEs the cost of equity cannot be derived from the capital market, nor can ...

With the advent of new innovative mobility protocols, it is hard to realize seamless mobility. There are several reasons for this problem. First, service providers have to deploy in the entire networks and this demands a lot of financial investment. Second, even with those innovations, new mobility protocols are likely to be ignored by customers if it costs a lot of money for subscribers. Third...

Cloud communication service (CCS) with its simplicity and lower investment cost is becoming increasingly popular. In contrast to its growing popularity, very little is known about the internals of CCS with respect to its architecture and protocols. To gain insights into CCS, we study a popular cloud communication service ”Twilio” using gray box techniques. In our study, we provide insights into...

Pharmaceutical companies have long been reluctant to invest in producing new vaccines for the developing world because they have little prospect of earning an attractive return. One way to stimulate such investment is the use of an advance market commitment, an innovative financing program that guarantees manufacturers a long-term market. Under this arrangement, international donors pay a premi...