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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
91

Towards a Unified Model-Based Formalism for Supporting Safety Assessment activities

Forssén, Fredrik January 2010 (has links)
Safety assessment is a rational and systematic process for assessing the risk associated with the usage of a product. While the safety assessment process is important even when making a simple product, the true importance of this process comes into light when designing for example an aircraft, where a failure could possibly lead to the loss of human lives. However,even though this process is vital for certain industries, it is plagued by a lack of tools. The existing tools are focused on specific parts of the process and do not make use of work done in earlier steps of the process which often means that the safety engineer needs to manually do work that could have been calculated automatically from information that is already present from an earlier step in the process. This thesis shows that by creating a model of the product that can be present and augmented throughout every step in the process, many calculations that are currently done by hand can be automated or semi-automated by examining this shared model. The thesis proposes a specification for a modeling formalism that is simple enough to be used as early as the requirements phase of a project, but powerful enough to provide important information all the way throughout the safety assessment process. The thesis also specifically shows how this model can be used to help in the creation and updating process of Failure Mode and Effects Analysis (FMEA) documents as a proof-of concept implementation based on Sörman Information AB’s product “Uptime BPC Standard”.Algorithms for synchronizing between the model and the FMEA representation, as well as algorithms for automatically calculating the next level effect and global level effect of failure modes based on the hierarchy and connections made in the model are also presented. The prototype implementation shows that even though the entire safety assessment process cannot be automated it is possible to extract information from the model by analyzing its hierarchy and connections. While more work still needs to be done before the entire safety assessment process can be encompassed, the initial results shows that the proposed modeling formalism allows us to create models from which relevant information that can be used to support the safety assessment process can be calculated.
92

Rizika elektronického obchodování v podniku na B2B trhu / The Risks of e-commerce in a Company on the B2B Market

Vrbecký, Tomáš January 2020 (has links)
This diploma thesis deals with the issue of risks associated with e-commerce of a company operating in the B2B market. The introductory part is devoted to a search of marketing issues, where the basics of online marketing tools and services needed for the operation of the e-shop are theoretically substantiated. Thanks to the formulation of the problem, the objectives of the work are set, which include the analysis of risks and the proposal of measures to reduce the probability of these risks. Risk analysis is performed using the FMEA method, as this method can analyze in detail the individual points in groups of problems. The final discussion presents individual proposals for measures, for which the benefits for society are given, as well as a table of estimated costs for these measures.
93

Analyzátor proudové smyčky 0(4) - 20 mA / Current loop 0(4) - 20 mA Analyzer

Mládek, Ondřej January 2015 (has links)
The subject of master´s thesis the problematics of current loop. Within the thesis, the basic components of current loop and the possibilities of its usage are described. There has also been an analysis made of the crucial functions of analyzer which is currently being in the process of development. A focus is put on mode of source and measure. The related functions are crucial in terms of testing and simulation of current loop. Furthermore, the SPI is described and it is used to establish access to the analyzer’s display. The usage of FMEA method has been chosen for the purpose of circuit’s reliability assessment. Practical part describes development of the analyzer and its parts. FMEA method application for selected fault states is presented in final part.
94

Použití metody FMECA pro prevenci chyb v průmyslovém podniku / Using of FMECA method for prevention of errors in the industrial enterprise

Macháč, Miroslav January 2012 (has links)
This thesis is focused on using FMECA in a manufacturing company. Analysis was developed in conjunction with a manufacturing company and its main goal is to decrease number of scrap. FMECA helped to find the most critical possible defects and then some actions for decreasing number of scrap were suggested.
95

Identifikace a hodnocení chyb při montáži pneumatických ventilů / Identification and assessment of errors in the assembly line of the pneumatic valves

Kadilák, Tomáš January 2015 (has links)
This thesis is focused on identification and evaluation of errors during pneumatic valve assembly. Theoretical part describes tools used: quality gate, flow chart, Pareto diagram and FMEA analysis. Within practical part the current assembly process is analyzed with current errors and besides evaluation, the improvement priorities and ways to accomplish these improvements in an actual company are defined. If the company chooses to take the opportunity to implement these improvements, thesis also monitors the results and reaction to the change of the analyzed process to a certain point.
96

Bezpečnost provozu mobilních robotů v indoor prostředí / Operational safety of mobile robots in indoor environment

Vojta, Jakub January 2012 (has links)
During cooperation with the Bender Robotics company a need for operational safety assessment of an autonomous mobile robot (AMR) emerged. Operational safety evaluation is a step towards mass production of the studied robot. Market entry of a product requires a string of various actions and safety assessment is one of them. For risk identification and severity rating were used legal requirements, best practice given by standards, FMEA method, experiment and RIPRAN method. Threats, possible scenarios and risks analysis is systematically discussed through all areas of operation of the robot, from design and construction to control software. All the steps are described in logical order. Starting with information research, going on with series of analysis and ending with suggestions for increased operational safety of autonomous mobile robots.
97

Procesní FMECA analýza kartonového stojanu / FMECA procedural analysis of a cardboard stand

Potěšilová, Hana January 2015 (has links)
The thesis deals with application of method FMECA to the manufacturing process of cardboard stand. The aim of work is to describe cardboard stand manufacturing, identify fault conditions and their consequences in particular manufacturing processes. In order to increase reliability of cardboard stands, we have designed measures based on analysis of criticality.
98

Averze spotřebitele/investora ke ztrátě / Aversion of the consumer/investor to loss

Svorad, Michal January 2016 (has links)
This Masters thesis analysis attitude and behavior of consumer in a role of investor in financial market to the loss or how to avoid the risk of future losses .In the theoretical part describes the theory needed to understand the other part, here in after referred to as tools and methods that are used to reduce the risk of loss.
99

Manufacturing system maintenance development

Bowen, Brennan P. 26 January 2010 (has links)
see document / Master of Engineering
100

Supplementary failure mode and effect analysis (FMEA) for safety application standards DIN EN ISO 13849 safety function-fmea

Düsing, Christa, Prust, David 26 June 2020 (has links)
In the automotive industry, the Safety Function-FMEA according to ISO 26262 and its application to functional safety relevant systems is a well-established process in the form of Automotive Safety Integrity Levels (ASILs). These represent the failure mitigation that must be applied to ensure an acceptable residual risk of malfunctioning behaviour. The DIN EN ISO 13849 (ISO 13849) already describes a process to reduce risks for machines which starts with a Hazard And Risk Analysis (HARA) as described in DIN EN ISO 12100 and concludes with the Safety Requirements Specification (SRS). The SRS is a functional and technical safety concept defining requirements and guidelines to make sure the design conforms to defined safety goals. ISO 13849 lists important faults and failures for various technologies. The defined Safety Functions (SFs) can be classified in corresponding categories that lead to the particular hardware/system structure. This applies to mechatronic systems consisting of at least one sensor, one control unit and one actuator to monitor the system and effect a response in case of failure. Compared to the methods described in ISO 13849, the Safety Function-FMEA allows systematic identification of additional failures resulting from combinations of effects, rather than only listing the main failure causes. Based on the complexity of the machines it is highly recommended to perform a Safety Function-FMEA as a complementary method to assess and improve the overall safety of machinery.

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