Cooperative file sharing mechanism with Network Coding in wireless Mesh networks

This article describes a new model of a cooperative file sharing system in a wireless Mesh network. The authors' approach is to develop an efficient and cooperative file sharing mechanism based on opportunistic random linear Network Coding. Within this mechanism, every node transmits random linear combination of its packets according to cooperative priority, which is computed in a distributed manner according to the node-possible contribution to its neighbor nodes. With this mechanism, the more a node contributes to others, the more the node has chances to recover the entire file first. The performance metrics of interest here are: the delay until all the packets in a file have been delivered to all nodes, and an ideal packet size, by the use of which the authors can get the minimum transmission delay. Through extensive simulation the authors compare their mechanism with the current transmission process in a wireless Mesh network without random linear Network Coding. The authors found that using their mechanism, the nodes can cooperatively share the entire file with less transmission time and delay than the current transmission process without random linear network.     

Gentrifiers Settling Down? Patterns and Trends of Residential Location of Middle-Class Families in Amsterdam

Based on data for Amsterdam, the Netherlands, this paper presents new evidence of a strong increase in the number of middle-class families in the city. By presenting the spatial patterns and trends of middle-class families in selected Amsterdam neighbourhoods, the paper shows that central neighbourhoods in particular attract middle-class families. In addition, new-build areas, both central and peripheral, offer a residential environment for middle-class families as a compromise between inner city and suburb. This paper links these patterns and trends with gentrification literature. Middle-class family neighbourhoods are classified in a typology that perceives neighbourhoods as fields that are accessed by means of capital, and operate as a stage for the accumulation of various forms of capital, which are associated with various habituses of the middle class.     

Ribosomal Synthesis of Peptides with C‐Terminal Lactams,Thiolactones, and Alkylamides

All change at the C terminus : We have established a novel methodology for the ribosomal synthesis of peptides featuring C‐terminal cyclization and various modifications, including macrocyclization, by making use of genetic code reprogramming. The C‐terminal amide modification of linear and cyclic peptides should enhance their physiological stabilities, and open up the possibility of developing new drug‐like peptides.

     

Automatic determination of acoustic model topology using variational Bayesian estimation and clustering for large vocabulary continuous speech recognition

We describe the automatic determination of a large and complicated acoustic model for speech recognition by using variational Bayesian estimation and clustering (VBEC) for speech recognition. We propose an efficient method for decision tree clustering based on a Gaussian mixture model (GMM) and an efficient model search algorithm for finding an appropriate acoustic model topology within the VBEC framework. GMM-based decision tree clustering for triphone HMM states features a novel approach designed to reduce the overly large number of computations to a practical level by utilizing the statistics of monophone hidden Markov model states. The model search algorithm also reduces the search space by utilizing the characteristics of the acoustic model. The experimental results confirmed that VBEC automatically and rapidly yielded an optimum model topology with the highest performance.     

Ultrastructural study on the hypothalamic-hypophysial-adrenal axis in fetal rats

The adrenal glands of decapitated and encephalectomized fetal rats were investigated electron microscopically and compared to those of normal intact fetal rats. Although the adrenal cortices did not show three zones (zona glomerulosa, fasciculata, and reticularis) on the 16.5th day of gestation when the decapitation or encephalectomy was carried out in utero, the zonation was recognized in fetuses operated on the 21.5th day of gestation. The same was true for normal control fetuses. However, cytoplasmic characteristics suggesting steroidogenesis in the cortical cells were reduced to various degrees in the encephalectomized or decapitated fetuses, especially in the latter ones. The change in cytoplasmic appearance was more conspicuous in the inner portion of the cortex. This result suggests that for the maintenance of normal adrenocortical function the hypothalamus may be indispensable even during the prenatal life of rats.     

Pathological specimens of rat temporal bone--comparison between different fixative solution

We investigated the difference in temporal bone specimens fixated by three sorts of fixative solution (10% formalin fixative, Wittmaack's fixative and Heidenhein-SuSa fixative). 1. 10% Formalin's fixative solution We found many pinkish precipitates, which are stained by hematoxy-eosin, in the scala media of the cochlea. Same substance is found in the perilymphatic space and endolymphatic space in the vestibulum. The fusion of the cells is indicated in the tectorial membrane, inner sulucus cell, outer sulucus cell especially in the apical turn of the cochlea. 2. Wittmaack's fixative solution The detachment of inner and outer sulucus cells are found from basilar membrane at the basal turn of the cochlea. The tendency in convex and concave form of the Reissner's membrane is most remarkable in these three fixative solution. 3. Heidenhein-SuSa fixative solution In this solution, no precipitates, no fusion of cells are found. No detachment of the inner or outer sulucus cells is also found. This study indicates that Heidenhein-SuSa fixation is most excellent fixative method.     

Multipath delay prediction on workstation for urban mobile radio environments

A multipath delay profile prediction system has been implemented on a workstation. The proposed system predicts profiles on the basis of a topological building database by assuming a propagation model that consists of, at each receiving point, a direct-diffracted wave and waves scattered by those walls visible from the transmitting antenna.<>     

Computing and estimating information matrices of weak ARMA models

Numerous time series admit weak autoregressive-moving average (ARMA) representations, in which the errors are uncorrelated but not necessarily independent nor martingale differences. The statistical inference of this general class of models requires the estimation of generalized Fisher information matrices. Analytic expressions are given for these information matrices, and consistent estimators, at any point of the parameter space, are proposed. The theoretical results are illustrated by means of Monte Carlo experiments and by analyzing the dynamics of daily returns and squared daily returns of financial series.     

Shape similarity by homotopic deformation

nk +n log n) time, where n is the number of vertices in the polygonal shapes and k is an index to indicate how the target shape is convoluted. Experimental results show the feasibility of our approach. Extending the method for comparison of scenes with mutiple objects is also discussed.