Cooperative Secret Communication with Artificial Noise in Symmetric Interference Channel

We consider the symmetric Gaussian interference channel where two users try to enhance their secrecy rates in a cooperative manner. Artificial noise is introduced along with useful information. We derive the power control and artificial noise parameter for two kinds of optimal points, max-min point and single user point. It is shown that there exists a critical value $P_c$ of the power constraint, below which the max-min point is an optimal point on the secrecy rate region, and above which time-sharing between single user points achieves larger secrecy rate pairs. It is also shown that artificial noise can help to enlarge the secrecy rate region, in particular on the single user point.Comment: 3 pages, 3 figures, to appear in IEEE Communications Letter

Effects of process parameters on mechanical properties of abrasive-assisted electroformed nickel

AbstractA cathode mandrel with translational and rotational motion, which was supposed to obtain uniform friction effect on surface, was employed in abrasive-assisted electroforming for revolving parts with complex profile. The effects of current density, translational speed and rotational speed on the deposit properties were studied by orthogonal test. The tensile strength, elongation and micro hardness value were measured to find out how the factors affected the properties. The optimized results show that changes of current density affect the tensile strength of nickel layer most, while translational speed has the most remarkable influences on both elongation and micro hardness. The low rotational speed affects the properties least. In this experiment, a smooth nickel layer with tensile strength 581MPa, elongation 17% and micro hardness 248HV is obtained by the orthogonal test

Impact of the Collective Forest Right System Reform on Poverty Reduction and Income Growth for Forest Farmer in Mountain Area - A Case Study of Jiangxi Province, China

Despite being a strong advocate for children’s rights in the international community, Sweden has received critique from the Committee on the Rights of the Child regarding the high number of children who have been removed from their families and that are currently living in foster homes. Previous research has not dealt with the issue of children’s rights in foster care placement processes in Sweden, nor has it included Sweden in discourse analyses on children’s rights, or sufficiently explored the relationship between discourse and implementation of the UNCRC. I use theories on discourse and translation in order to provide a comparative analysis of the articulations of children’s rights relevant for foster care placement processes in the UNCRC, and on the national and local level in Sweden. The analysis points to both similarities and differences in the discourses and identifies six aspects of the Swedish discourse that make certain activities in foster care placement processes possible, desirable and inevitable

Resonant activation: a strategy against bacterial persistence

A bacterial colony may develop a small number of cells genetically identical to, but phenotypically different from other normally growing bacteria. These so-called persister cells keep themselves in a dormant state and thus are insensitive to antibiotic treatment, resulting in serious problems of drug resistance. In this paper, we proposed a novel strategy to "kill" persister cells by triggering them to switch, in a fast and synchronized way, into normally growing cells that are susceptible to antibiotics. The strategy is based on resonant activation (RA), a well-studied phenomenon in physics where the internal noise of a system can constructively facilitate fast and synchronized barrier crossings. Through stochastic Gilliespie simulation with a generic toggle switch model, we demonstrated that RA exists in the phenotypic switching of a single bacterium. Further, by coupling single cell level and population level simulations, we showed that with RA, one can greatly reduce the time and total amount of antibiotics needed to sterilize a bacterial population. We suggest that resonant activation is a general phenomenon in phenotypic transition, and can find other applications such as cancer therapy.Comment: 21 pages, 12 figures, submitte