Analysis of Burst Ratio in Concatenated Channels

Burst ratio is a parameter that quanties packet loss patterns in transmission networks. It has been dened for an end-to-end scenario, therefore burst ratio can be determined only if the characteristics of the whole transmission path are known. In this paper, the burst ratio parameter applicability to cases when the transmission path consists of a series of transmission channels with known packet loss rate and burst ratio values is extended. The paper also presents the results of simulations performed with NS2 software, demonstrating the validity of the burst ratio analysis. Consequently, the research makes it possible to determine the value of the burst ratio parameter in concatenated packet networks, which in turn supports delivering higher quality VoIP services

Burst Ratio in Concatenated Markov-based Channels

This paper deals with the burst ratio parameter, which describes the burstiness of a packet loss observed in digital networks. It is one of the input parameters of E-model – the most widely used method of assessing conversational quality of telephony. The burst ratio is defined for one channel scenario so it can be calculated when the whole transmission path has been characterized by a single set of parameters. The main objective of the paper is to extend the burst ratio definition when the transmission path is defined as a tandem concatenation of transmission channels being described by their individual burst ratios. It is assumed that packet loss of a single channel is described by a 2-state Markov chain. The final result of the research is an equation describing the burst ratio parameter when the transmission path consists of multiple concatenated channels. The derived formula has been validated by extensive simulations

Numerical investigation of the secondary flow development in turbine cascade

The results represent the first attempt of the numerical analysis of 3-D secondary flows formed in the linear turbine cascade wind tunnel. Numerical simulations were carried out by means of the SPRC code. It was possible to make presented here calculations thanks to the cluster of PC's providing sufficient computational resources. In order to be able to verify the obtained results the case considered is the workshop test case (D.G.Gregory-Smith 1994 Turbomachinery Workshop Test Case No.3 116). It has been shown that the obtained results are in a very good agreement with experiment. It gave confidence in the results and several important conclusions concerning the development of streamwise vortices could be made thanks to the work carried out

Development of a generic XML personality metadata handler for distributed entertainment services

Especially in the case of entertainment services, the provision of a general valid personality profile is gaining in importance. The personality profile shall include information about the usage-context of media services. These media services can be arbitrary and range from simple playlist compilations of audio-visual content to complex feedback profiles in interactive television. This research paper provides an overview of a metadata based solution for merging personalized content. Multiple applications, such as audio or video players contribute with user-context information enabling future personalization scenarios. An XML metadata specification is presented providing a generic container format for representing a personality user profile. To enable generality, the personality profile simply extends existing XML standards by adding attributes and thus keeping the existing structure intact. This also allows the creation of slim and resource efficient personality schemas which are especially beneficial when deployed on resource-sensitive client devices like mobile phones. © 2008 Springer-Verlag

The analyze of the power of legs and various types of reaction among the hockey field players at the highest level of sport advance

The aim of the research was to find out the time reaction in a jump after a sound and visual stimulus. Another aim was to define the power of legs among the hockey field players during the pre-season and start season. The result of the hockey field players’ from AZS AWF Poznań and the Polish National Team were the subject of the research, which was carried out twice by the system of optical research – Opto-jump. The somatic and fat measurements were made. The results of the selected group (Polish National Men’s Team) may give the vision of the model of the players their power of the legs, the reaction time at a sound and visual stimulus. Thanks to these results we can compare them with the league team and follow the changes of the parameters level during the training season. In conclusion the training season didn’t have any essential influence on the measured parameters. The Polish Representation results were at far higher level than the league team. We can confirm that the level of the measured features don’t change in a training year

Distributing the personal digital environment throughout your entertainment environment: Handling personal metadata across domains

It is a fact, that we are surrounded by more and more ubiquitous services in entertainment computation. All sorts of devices are more and more connected, and personalization becomes more and more a major issue. We are living in a world with two layers: the real physical layer being our real-world, and its synthetic overlay consisting of location-based services, chatting applications, or Web 2.0 offers. In the real-world, communication between humans is a matter of personality of different persons: exchanging information about each other, finding common interests, or finding common conversation themes. In the synthetic overlay, communication becomes a matter of distribution of personal profiles or automating profile matching. The open-source platform Portable Personality (P2) ( www.portable-personality.org ) faces this challenge, and provides a platform for cross-service interchange of personal context information based on any generic metadata type. P2's software architecture is designed for mining, enriching, and exchanging personal profiles between arbitrary multimedia services. The long-term vision of P2 is to provide a personality profile rather than a personal context information profile to enable communication between human and device as a matter of personalities, rather than automated matching of profiles. Two different scenarios, the Smart Social Network (SSN), and the personalization of audio-visual data are presented as practical use-case for P2. © 2009 Springer-Verlag

Recent advances in enzymatic and chemical deracemisation of racemic compounds

Contains fulltext : 123227pos.pdf (postprint version ) (Open Access

A platform for predicting mechanism of action based on bacterial transcriptional responses identifies an unusual DNA gyrase inhibitor

Summary: In the search for much-needed new antibacterial chemical matter, a myriad of compounds have been reported in academic and pharmaceutical screening endeavors. Only a small fraction of these, however, are characterized with respect to mechanism of action (MOA). Here, we describe a pipeline that categorizes transcriptional responses to antibiotics and provides hypotheses for MOA. 3D-printed imaging hardware PFIboxes) profiles responses of Escherichia coli promoter-GFP fusions to more than 100 antibiotics. Notably, metergoline, a semi-synthetic ergot alkaloid, mimics a DNA replication inhibitor. In vitro supercoiling assays confirm this prediction, and a potent analog thereof (MLEB-1934) inhibits growth at 0.25 μg/mL and is highly active against quinolone-resistant strains of methicillin-resistant Staphylococcus aureus. Spontaneous suppressor mutants map to a seldom explored allosteric binding pocket, suggesting a mechanism distinct from DNA gyrase inhibitors used in the clinic. In all, the work highlights the potential of this platform to rapidly assess MOA of new antibacterial compounds