Given a stationary time series X and another stationary time series Y (with a different power spectral density), we describe an algorithm for constructing a stationary time series Z that contains exactly the same values as X permuted in an order such that the power spectral density of Z closely resembles that of Y. We call this method spectral mimicry. We prove (under certain restrictions) that...

Low sensitivity and/or specificity of a diagnostic test for outcome results in biased estimates of the time to first event using product limit estimation. For example, if a test has low specificity, estimates of the cumulative distribution function (cdf) are biased towards time zero, while estimates of the cdf are biased away from time zero if a test has low sensitivity. In the context of discr...

Information on the relationship between rainfall intensity, duration and accumulation frequency or return period (IDF) is commonly utilized in design management of urban drainage systems. Can Tho City, located Vietnamese Mekong Delta, a city which has recently invested heavily upgrading its stormwater systems hope preventing reoccurring flood events. Yet, much these works were designed based ob...

Co-channel interference is a major factor in limiting the capacity and link quality in cellular communications. As the co-channel interference is modeled by lognormal distribution, sum of the co-channel interferences of neighboring cells is represented by the sum of lognormal Random Variables (RVs) which has no closed-form expression. Assuming independent, identically distributed (iid) RVs, the...

A five-parameter distribution called Beta Generalized Weibull (BGW) distribution is introduced. Beta Generalized Exponential (BGE), Beta Weibull (BW), Generalized or Exponentiated Weibull (GW or EW), Generalized Rayleigh (GR), Beta Exponential (BE), Generalized Exponential (GE), Weibull, Rayleigh and Exponential are its sub models. The cumulative distribution function (cdf) and the probability ...

The paper explores N-hop FSO communications assisted by amplify-and-forward relays (AFRs) over N-gamma-gamma (N-gg) turbulence induced (TI) fading channels. We model TI signal as the product of independent but not necessarily identically distributed (i.n.i.d) N number gg random processes (RPs) in order to address AFR moderate strong conditions. closed form statistical measures such as: probabil...

In this work, in order to achieve higher spectrum efficiency, we propose a reconfigurable intelligent surface (RIS)-assisted multi-user communication uplink system. Different from previous work which the RIS only optimizes phase of incident users's signal, use create virtual constellation diagram transmit data an additional user signal. We focus on two-user case and develop tight approximation ...

Reconfigurable intelligent surface (RIS)-aided wireless communications have drawn significant attention recently. We study the physical layer security of downlink RIS-aided transmission framework for randomly located users in presence a multi-antenna eavesdropper. To show advantages networks, we consider two practical scenarios: Communication with and without RIS. In both cases, apply stochasti...

A method to estimate an extreme quantile that requires no distributional assumptions is presented. The approach is based on transformed kernel estimation of the cumulative distribution function (cdf). The proposed method consists of a double transformation kernel estimation. We derive optimal bandwidth selection methods that have a direct expression for the smoothing parameter. The bandwidth ca...

2 Naive Surplus Theory 2.1 Consumers who buy 0 or 1 unit I introduce the concept of surplus in one of the simplest models of demand. [This is the model underlying (Bakos and Brynjolfsson, 1999).] Consider a very large population of K consumers facing a market for a single good. Each consumer will buy either one or zero units of this good (per period), depending on the price. Each consumer has a...