DeepVoCoder: A CNN model for compression and coding of narrow band speech

This paper proposes a convolutional neural network (CNN)-based encoder model to compress and code speech signal directly from raw input speech. Although the model can synthesize wideband speech by implicit bandwidth extension, narrowband is preferred for IP telephony and telecommunications purposes. The model takes time domain speech samples as inputs and encodes them using a cascade of convolutional filters in multiple layers, where pooling is applied after some layers to downsample the encoded speech by half. The final bottleneck layer of the CNN encoder provides an abstract and compact representation of the speech signal. In this paper, it is demonstrated that this compact representation is sufficient to reconstruct the original speech signal in high quality using the CNN decoder. This paper also discusses the theoretical background of why and how CNN may be used for end-to-end speech compression and coding. The complexity, delay, memory requirements, and bit rate versus quality are discussed in the experimental results.Web of Science7750897508

Sex-specific habitat selection of rough-legged hawks (Buteo lagopus) wintering in western North America

The rough-legged hawk (Buteo lagopus sanctijohannis) is one of the most under-studied raptor species in North America. As a species that exhibits reversed sexual dimorphism, sex-specific habitat preferences may exist. To investigate rough-legged hawk sex-specific habitat selection preferences, we equipped 17 rough-legged hawks (n = eight females, nine males) with GPS backpacks on their wintering grounds (n = six study areas) during the winter months of 2014 and 2015 in five states in western North America. I analyzed rough-legged hawk habitat selection in relation to sex at four spatial scales: nocturnal roosting site, 50% core range, 95% winter range, and 200% ecoregion range. Habitat selection variables included land cover, patch size, terrain ruggedness, indicators of anthropogenic disturbance, and measures of interspecific competition. Species and sex-specific preferences existed at each spatial scale, suggesting that hawks balanced competition for roosting and foraging habitat against prey availability and anthropogenic sources of disturbance when selecting habitat. At each spatial scale, female hawks preferentially selected for high quality habitat, while male rough-legged hawks used high as well as lower quality habitat (qualified by the presence of perching structures, human disturbance, and prey catchability). I posit that reversed sexual dimorphism in rough-legged hawks leads to social dominance of female hawks on their wintering grounds and that females may outcompete males for higher quality foraging habitat

SIP registration stress test

This paper deals with a benchmarking of SIP infrastructure and improves the methodology of SIP performance evaluation further to better fit into the design of the SIP testing platform, which is being designed in the VSB – Technical University of Ostrava. By separating registrations from calls, we were able to measure both cases without the need of extensive postprocessing of data to ensure the data in one case is not affected by the ones from the other case. Moreover the security vulnerability of the SIP protocol has been harnessed to allow measuring software for performing both registrations and calls together but in individual processes, which builds the basis for planned and already mentioned modular design of the platform. In this paper, we present the results from separate registration stress tests and we explain the usage of the proposed SIP benchmarking methodology

Design and Implementation of E-shop with Search Engine Optimization

Import 26/06/2013Cílem diplomové práce je navržení a realizace internetového obchodu zaměřeného na oblast prodeje a stavby domácích krbů a kamen. Práce je rozdělena do čtyř hlavní částí. V první kapitole jsou teoreticky popsány důležité aspekty ovlivňující tvorbu a provoz internetového obchodu. Následující kapitola analyzuje původní stránky a definuje požadavky na nový internetový obchod. Cílem třetí kapitoly je navržení a realizace internetového obchodu včetně analýzy klíčových slov, analýzy konkurence a následná optimalizace pro vyhledávače. Poslední kapitola se zabývá analýzou návštěvnosti a hodnocením přínosů.The aim of the thesis is design and implementation of the e-shop focusing on the area of sales and building of fireplaces and stoves. The thesis is divided into four main parts. In the first chapter are theoretically described important aspects affecting development and maintenance of the e-shop. The following chapter analyzes initial website and define requirements for new e-shop. The aim of the third chapter is design and implementation of the e-shop including keyword analysis, competition analysis and following search engine optimization. The last chapter focuses on the analysis of traffic and evaluation of benefit.155 - Katedra aplikované informatikyvýborn

Theoretical Runway Capacity Estimation Based on Coloured Petri Nets

Bakalářská práce se zabývá odhadem teoretické kapacity vzletové a přistávací dráhy. Jako metoda řešení této problematiky jsou zvoleny barevné Petriho sítě. První část se věnuje charakteristikou procesu vzletu a přistání, včetně jednotlivých faktorů, které tyto procesy ovlivňují. Další část práce je zaměřena na teorii Petriho sítí a programu CPN Tools, ve kterém je vytvořen simulační model. Tento model je dále popsán a jsou vysvětleny jednotlivé části tohoto modelu. Po skončení simulačních experimentů jsou výsledky zpracovány do tabulek a porovnány s výsledky obsaženými v bakalářské práci obhajované v akademickém roce 2016/2017.The bachelor thesis deals with the estimation of the theoretical capacity of the runway. Color Petri nets are chosen as a method of solving this issue. The first part deals with the characteristics of the take-off and landing process, including the factors that influence these processes. The next part of the thesis is focused on the theory of Petri nets and CPN Tools, in which the simulation model is created. This model is described below and the parts of this model are explained. After the simulation experiments, the results are processed into tables and compared with the results contained in the bachelor thesis defended in the academic year 2016/2017.342 - Institut dopravyvelmi dobř

Speech quality monitoring in czech national research network

This paper deals with techniques of measuring and assessment of the voice transmitted in IP networks and describes design of quality measurement, which can be used for Cisco Gateways. Cisco gateways send Calculated Planning Impairment Factor in every CDR (Call Detail Record). Our design is based on collection of CDR's, their storing into SQL database and their visualization through web page. This design was implemented and successfully tested in CESNET network.8511711

A novel approach to quality-of-service provisioning in trusted relay Quantum Key Distribution networks

In recent years, noticeable progress has been made in the development of quantum equipment, reflected through the number of successful demonstrations of Quantum Key Distribution (QKD) technology. Although they showcase the great achievements of QKD, many practical difficulties still need to be resolved. Inspired by the significant similarity between mobile ad-hoc networks and QKD technology, we propose a novel quality of service (QoS) model including new metrics for determining the states of public and quantum channels as well as a comprehensive metric of the QKD link. We also propose a novel routing protocol to achieve high-level scalability and minimize consumption of cryptographic keys. Given the limited mobility of nodes in QKD networks, our routing protocol uses the geographical distance and calculated link states to determine the optimal route. It also benefits from a caching mechanism and detection of returning loops to provide effective forwarding while minimizing key consumption and achieving the desired utilization of network links. Simulation results are presented to demonstrate the validity and accuracy of the proposed solutions.Web of Science28118116

Optimization of Use of Handling Equipment at Prague Airport

Diplomová práce se zabývá optimalizací počtu pásových nakladačů zavazadel potřebných k obsloužení daného počtu letů. Důvodem je např. efektivní hospodaření s vozidlovým parkem těchto prostředků a snížení nákladů na jejich pořízení a provoz. První část práce se věnuje charakteristice procesu technického odbavení letadel a popsání jednotlivých druhů manipulačních prostředků, které se do procesu handlingu zapojují. Další část práce je zaměřena na formulaci problému a vytvoření matematického modelu. Dále je popsána aplikace daného modelu včetně představení pracovního prostředí pro jeho řešení. Po ukončení optimalizačního výpočtu jsou dosažené výsledky zpracovány a interpretovány.This master thesis deals with the optimization of belt luggage loaders needed to operate at given number of flights. The reason is, for example, the efficient management of the vehicle fleet of these loaders and the reduction of the costs of their operation or equipment. The first part deals with the characteristics of the aircraft handling process and the description of individual ground handling equipment participating in the handling process. The net part of the thesis is focused on formulation of the problem and the creation of mathematical model. Furthermore, the application of the model is described, including the introduction of the working environment and its use. After completing of the optimization calculation, the results are processed and described.342 - Institut dopravyvýborn