National Repository of Grey Literature 293 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Organizational Culture and its Influence on the Effectiveness of Work
Kirchnerová, Zuzana ; Machalová, Pavla (referee) ; Pokorný, Jiří (advisor)
This thesis is focused on improving the state of corporate culture in Nutrend D.S., a.s. On the basis of analysis of results obtained in questionnaire inquiry, there were some drawbacks detected in managers getting familiar with the vision and long-term business objectives, in the financial evaluation and incentive system, and also in the working environment. Further there was an existing rivalry identified between different departments and low willingness of employees to attend corporate events. Subsequently, the proposals and recommendations have been processed leading to the elimination of these drawbacks and to improvement of the present state.
Evaluation and Development of Employees within a Company
Válková, Klára ; Mráček, Pavel (referee) ; Mráček, Pavel (referee) ; Pokorný, Jiří (advisor)
The Master's thesis deals with the topic of evaluation and development of employees within conditions of a trading company distributing detergents and the analysis of the current situation of the evaluation and development system in this company. On the basis of findings, the thesis includes a proposal for solving problems in the company by introducing the Standard Investors in People into the company.
Impact of aerial platform material on antenna gain
Tobolka, Lukáš ; Zeman, Kryštof (referee) ; Pokorný, Jiří (advisor)
The goal of this thesis is to recreate some of the most used multicopter configurations within CAD software with varying materials. These models are then imported into ANSYS HFSS to examine the influence of shape and material on the performance of an antenna. Results from these tests could help in the creation of a high-speed (Gb/s) backhaul network in the future. The theory section is about multicopters, their configurations and materials used in their manufacture. Subsequently, it delves into the fundamental theory behind antennas and the description of CAD software (Autodesk Inventor 2016) and antenna simulation software (ANSYS HFSS). The practical section includes: description of the measurement process for the MikroTik wAP 60G AP antenna, the parameters of which were used during the simulation; a model of the antenna (horn) and last but not least the results of the measurements, which are the thesis’ main benefit.
Implementation of OMG/DDS model and communication analysis
Bučko, Kristián ; Fujdiak, Radek (referee) ; Pokorný, Jiří (advisor)
In bachelor´s thesis there is an introduction of OMG DDS specification, theoretical comparison of three most widespread implementations OpenDDS, Vortex Opensplice and RTI Connext, too. Important differences between data-focused publish-subscribe and object-focused client-server (e.g. CORBA) communication are also described in the thesis, as well as the usefulness of these two types in real-time systems. Implementation of RTI Connext is practically demonstrated on various types in scenarios of unsecured and secured communication where the communications themselves are caught in wireshark. The safety is evaluated in captured transfers. The publisher and subscriber codes were adjusted according to a need of measurement by which a communication latency between various sizes of a message is analyzed. A script in Python programming language was created for processing of timestamps and averaging values. A complete comparison of these scenarios and their graphical visual display are done in the end.
Aerial platform built on operating system FlytOS
Širjov, Jakub ; Štůsek, Martin (referee) ; Pokorný, Jiří (advisor)
The aim of this bachelor's work is creation of functional model of flying platform that can carry additional devices. The platform is designed to maintain continuous connection with the base station and to create an access point for a particular area. The flying platform has FlyOS installed, which facilitates control of the flying platform. Another part of the work describes steps for simulation of the first automated flight in FlytSIM with a preset parameter of rotation during flight. The platform's functionality is then verified by using manual remote control and also by simulated automated flight in real conditions. Final part shifts attention to the algorithm used for the computation of the rotation of the flight waypoints direction in degrees towards the base station based on the input data. In the case of large distances between the flight waypoints, it computes coordinates and the rotation of the UAV.
Aerial platform for flight time measurements
Schneider, Tibor ; Dvořák, Jan (referee) ; Pokorný, Jiří (advisor)
The bachelor thesis elaborates on creating a mathematical model and realisation of a flying platform. Consequently, it compares results from the mathematical model which simulates flight duration with results which were measured with constructed flying platform. In the first part of the thesis, flying platforms are introduced and also the usability range and what types exist. Matlab was chosen as a language to create the script. In the second part, principle of the matematical model is explained, graphs which explain power influence in UAV movement are presented. There are time dependences of hovering time on different UAV weight, flight distance or outside environment temperature. In the end, there is final comparison of theoretical calculations with measured time values. According to the calculations and measurments, it is more optimal to fly with a speed of 4m/s rather than 1m/s. According to the calculations, distance of 1000m was on the limit, therefore, the measurments were conducted within the range of 600m.
Smart Metering system
Gregor, Filip ; Pokorný, Jiří (referee) ; Mlýnek, Petr (advisor)
The thesis deals with a PLC technology. In the theoretical part a principle of PLC functionality and its advantages and disadvantages were described. In the experimental part methodology of point-to-point testing with BPL modems was designed. In addition extensive measurement according to point-to-point methodology for topology with and without repeater in laboratory was realized. Impact of repeater on transmission parameters was tested according to RCF 2544, RFC 6349 recommendation and according to methodology of TCP Throughput with the aid of Net Blazer testers and iPerf tool. The results shows that topology with repeater decreases throughput approximately 50 % and increases Round trip time (RTT) more than twice compared to topology without repeater. In the last part a laboratory task with Smart Metering system and BPL modems was designed.
Communication model using Data distribution service and communication security assessment
Frollo, Martin ; Fujdiak, Radek (referee) ; Pokorný, Jiří (advisor)
The diploma thesis is focusing on middleware layer in distributed systems. It introduces typically used communication protocols and standards operating on this layer. In theoretical part it brings closer look at OMG DDS specification. This part contains fundamental functionalities of this specification along with its architecture blocks. Thesis also describes the RTPS protocol functionality. Existing implementations of OMG DDS standard are described at the end of theoretical part. OpenDDS 3.13 implementation is used in practical part of thesis. It is deployed and tested on various platforms. Next part verifies option of securing RTPS data stream using beta version of OMG DDS Security, which OpenDDS 3.13 implementation contains. Secured and unsecured data flows are being compared. Latency of data stream is also important, especially in distributed systems. DDS system, which measures latency of RTPS stream is created in practical part. Latency of this DDS system can be measured in various configurations. Difference of devices’ performance used in measurements can be clearly seen in latency results where the size of data samples is increasing. Differences of measured latency are also recognizable between reliable and unreliable and secure and unsecure RTPS stream. Part of measurements is made between 2 physical devices with and without an attacker. Type of attack is MITM and it captures RTPS flow, which does not belong to attacking machine.
Software defined radio for LoRaWAN technology
Pospíšil, Ondřej ; Pokorný, Jiří (referee) ; Fujdiak, Radek (advisor)
This master's thesis deals with the description of LPWAN technologies focused on LoRaWAN technology in the theoretical part. The next part deals with description and analyzing of LoRaWAN protocol. In theoretical part also security elements of the LoRaWAN protocol are discussed and LoRaWAN 1.0.2 and 1.1.x versions are compared. The thesis also deals with LoRaWAN tapping and its decryption, both on the physical layer and the MAC protocol layer LoRaWAN. The thesis shows how to use software-defined radio to listen to LoRaWAN communication. Lastly, a replay attack and fake message over the fake session are performed

National Repository of Grey Literature : 293 records found   1 - 10nextend  jump to record:
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