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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.
11

Virtualizace a optimalizace IT v produkční společnosti / Virtualisation and Optimalisation of IT in a Production Company

Popelka, David January 2013 (has links)
The master‘s thesis deals with the implementation of server virtualization in the Entity production, s.r.o., which is a small company by it’s size, but needs modern IT technologies for the normal operations. The thesis shows how to reuse the server virtualization technologies from large corporations, that have been unavailable to small business companies in past. It also design show to optimize the current IT environment.
12

Studie ekonomiky technologie obrábění / The Study of Economics of Tooling Technology

Ondrášek, Dušan January 2008 (has links)
The aim of this diploma thesis addresses issues related to obtaining methodology for the production manager´s decision-making process in the field of technology selection, suitable tooling and cutting tools selection for a specific order or particular production plan. Evaluation of the manufacturing process while taking into consideration complexion of process controlling and contexture to the economy of this process. Analysis and evaluation of technological and economical aspects of a manufacturing process of the CNC chip machining in a real environment is targeted on the field of tooling, its selection, purchase, economy and consumption. The process controlling of technology is based on this analysis as well as the formulation of measuring by economic indicators such as economy, productivity, profitability etc. The analysis of important factors and parameters of this process demonstrated an influence on economy of the company. Several model cases have been created from the company records and from the provided research, the output of which became a basic methodology. The output of the analysis indicates possible directions of a management decision making. Thanks to a complex technical-economic view this thesis can serve as a methodological instrument for decision makers in the field of technology and cutting tool selections as well as an economy of production process improvement.
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13

Volba a optimalizace řezných podmínek pro progresivní výrobní technologie / Data selection and optimisation of cutting conditions for progressive production technologies

Krupka, Ondřej January 2014 (has links)
This thesis contains theoretical analysis of optimization methods of cutting conditions for current machining processes with focus on finishing turning. Further focus was put on influences of cutting conditions and other effects on requested quality and roughness of machined surface. The effect of part of these conditions was verified in experimental part. The influence of feed rate and depth of cut on surface roughness and geometrical accuracy was experimentally verified.
14

Internetový marketing / Internet marketing

KARBULKA, Tomáš January 2015 (has links)
This thesis provides comprehensive insight into the internet marketing used by the eshop. The aim of this thesis is to analyse the eshop and internet marketing tools used by the eshop to promote its products. The result of the analysis is an evaluation of effective Internet marketing channels. Proposals and recommendations that will lead to the optimization of eshop and internet marketing are drawn up based on the results of the analysis.
15

Vliv mezinárodního daňového plánování na hospodaření firmy / International Tax Planning and its Impact on Company's Economy

Vlk, Tomáš January 2009 (has links)
Aim of my master’s thesis on the topic „International Tax Planning and its Impact on Company's Economy“ is to evaluate current business model of the firm Jelko which is using it for products selling to the Slovakia. Based on the currect model analysis I will introduce other models, which could cause higher efficiency of advantageousness. I will analyse advantages and disadvantages of each model and following this analysis I will choose the best model which I will recommend to the firm in order to consider it and eventually to implement it.
16

Psigometriese ondersoek na psigologiese optimaliteit

Visser, Chrisna 06 1900 (has links)
Text in Afrikaans / Hierdie ondersoek handel oor die psigometriese verwantskappe tussen verskeie konseptualiserings van psigologiese optimaliteit. Die konsepte selfaktualisering (vanuit 'n humanistiese raamwerk), gevoel van koherensie en aangeleerde vernuftigheid (vanuit 'n behavioristiese en salutogenesis paradigma) is vir die doeleindes van hierdie ondersoek gekies. Die gekose meetinstrumente, naamlik die Persoonlike Orientasievraelys vir selfaktualisering, die Lewensorientasievraelys vir gevoel van koherensie en die Selfkontroleskedule vir aangeleerde vernuftigheid, is op 'n steekproef van 200 middelvlakbestuurders in 'n semi-staatsdiensorganisasie afgeneem. Pearsonkorrelasiekoeffisiente is bereken en 'n faktorontleding is gedoen. Daar is verskeie beduidende korrelasies verkry tussen die subskale van die Persoonlike Orientasievraelys en die Lewensorientasievraelys, maar slegs enkele beduidende korrelasies tussen die Persoonlike Orientasievraelys en die Selfkontroleskedule. Die Lewensorientasievraelys en die Selfkontroleskedule het egter beduidend gekorreleer. Die faktorontleding het getoon dat selfaktualisering aan die een kant, en gevoel van koherensie en aangeleerde vernuftigheid aan die ander kant as twee verskillende konstrukte van psigologiese optimaliteit beskou kan word. / The relationships between various conceptualisations of psychological optimisation are investigated. The concepts of self-actualisation (from a humanistic paradigm), sense of coherence and learned resourcefulness (from a salutogenesis paradigm) are relevant. The measuring instruments were the Personal Orientation Inventory (POl), the Orientation to Life Questionnaire (OLQ) and the Self Control Schedule (SCS). They were administered by means of random sampling of 200 middle level managers in a semi-government organisation. Pearson correlation coefficients were calculated and a factor analysis was done. Several significant correlations were obtained between the subscales of the POl and the OLQ, but limited correlations were found between the POl and the SCS. However, significant correlations between the OLQ and the SCS were apparent. The factor analysis demonstrated that self-actualisation on the one hand and sense of coherence as well as learned resourcefulness on the other hand may be regarded as two seperate constructs of psychological optimisation. / Industrial and Organisational Psychology / Thesis (M.Com.)--Universiteit van Suid Afrika, 1994.
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17

Psigometriese ondersoek na psigologiese optimaliteit

Visser, Chrisna 06 1900 (has links)
Text in Afrikaans / Hierdie ondersoek handel oor die psigometriese verwantskappe tussen verskeie konseptualiserings van psigologiese optimaliteit. Die konsepte selfaktualisering (vanuit 'n humanistiese raamwerk), gevoel van koherensie en aangeleerde vernuftigheid (vanuit 'n behavioristiese en salutogenesis paradigma) is vir die doeleindes van hierdie ondersoek gekies. Die gekose meetinstrumente, naamlik die Persoonlike Orientasievraelys vir selfaktualisering, die Lewensorientasievraelys vir gevoel van koherensie en die Selfkontroleskedule vir aangeleerde vernuftigheid, is op 'n steekproef van 200 middelvlakbestuurders in 'n semi-staatsdiensorganisasie afgeneem. Pearsonkorrelasiekoeffisiente is bereken en 'n faktorontleding is gedoen. Daar is verskeie beduidende korrelasies verkry tussen die subskale van die Persoonlike Orientasievraelys en die Lewensorientasievraelys, maar slegs enkele beduidende korrelasies tussen die Persoonlike Orientasievraelys en die Selfkontroleskedule. Die Lewensorientasievraelys en die Selfkontroleskedule het egter beduidend gekorreleer. Die faktorontleding het getoon dat selfaktualisering aan die een kant, en gevoel van koherensie en aangeleerde vernuftigheid aan die ander kant as twee verskillende konstrukte van psigologiese optimaliteit beskou kan word. / The relationships between various conceptualisations of psychological optimisation are investigated. The concepts of self-actualisation (from a humanistic paradigm), sense of coherence and learned resourcefulness (from a salutogenesis paradigm) are relevant. The measuring instruments were the Personal Orientation Inventory (POl), the Orientation to Life Questionnaire (OLQ) and the Self Control Schedule (SCS). They were administered by means of random sampling of 200 middle level managers in a semi-government organisation. Pearson correlation coefficients were calculated and a factor analysis was done. Several significant correlations were obtained between the subscales of the POl and the OLQ, but limited correlations were found between the POl and the SCS. However, significant correlations between the OLQ and the SCS were apparent. The factor analysis demonstrated that self-actualisation on the one hand and sense of coherence as well as learned resourcefulness on the other hand may be regarded as two seperate constructs of psychological optimisation. / Industrial and Organisational Psychology / Thesis (M.Com.)--Universiteit van Suid Afrika, 1994.
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18

Development and validation of a LC-MS/MS method for analysis of perfluorooctanesulfonic acid and perfluorooctaonic acid in liver organoid media

Heggebø Rolfsen, Sandra January 2024 (has links)
Per- and polyfluoroalkyl substances (PFAS) are organic synthetic compounds used in several industries because of their unique properties and thermal and chemical stability. Perfluorooctanesulfonic acid (PFOS) and perfluorooctaonic acid (PFOA) are two of the most prominent PFAS that are undegradable and accumulate in nature. To study the impact of PFOS and PFOA on the liver in a controlled environment, organoids can be used. A sensitive and selective LC-MS/MS method for individual and simultaneous analysis of PFOS and PFOA in liver organoid media and equipment used in organoid analyses was developed. For detection of low concentrations, ability to analyse complex organoid samples, and limit background contamination, a solid phase extraction (SPE) column, automatic filter (AFFL) and a trap column was included. The AFFL-SPE-LC-MS/MS was optimised efficiently through Design of Experiment (DoE) regarding the loading phase in the LC and six MS parameters for PFOS and PFOA. Validation was controlled against Eurachem’s guideline showing high sensitivity, detecting LOD at 6 pg/mL. The method demonstrated high repeatability with an RSD below 8 % for most samples. Simultaneous analysis of PFOS and PFOA demonstrated high selectivity. Nevertheless, the method showed low intermediate precision and varying reliability, as well as persistent background contamination limiting detection of lower concentrations. The method was fit for purpose and allowed rapid analysis of PFOS and PFOA in organoid media and equipment used in organoid analyses. Result from studies of PFAS in liver organoids through analysis with this method can aid in understanding the connection between PFAS and metabolic diseases. / Populärvetenskaplig sammanfattning Per- och polyfluorerade alkylsubstanser (PFAS) är en grupp av människoskapta, syntetiska ämnen med unika egenskaper. Dessa egenskaper gör att de är olja- och vattenavvisande, och har många applikationsområden. De finns i textiler, livsmedelsförpackningar, brandsläckningsskum och andra industriprodukter. De är väldigt termiskt och kemisk stabila, vilket gör att de inte bryts ner och därmed ackumulerar i miljön. Flera studier har också visat koppling mellan PFAS och många kroniska sjukdomar, som hormonstörningar, cancer, immunsuppression och metabolt associerad fettlever (MAFLD, tidigare nonalkoholisk fettlever (NAFLD)). Kopplingen mellan MAFLD och PFAS har fått mycket uppmärksamhet då levern har visats sig vara ett målorgan för PFAS. Eftersom PFAS är ihärdiga, har ett komplicerat spridningsbeteende och ackumulerar i naturen är det svårt att studera kopplingen mellan MAFLD och PFAS i en kontrollerad miljö. För att studera effekten av PFAS kan man använda organoider, laboratorieodlade 3D modeller gjord från stamceller för att imitera ett äkta organ.    Någon av de mest omtalade PFAS ämnen är perfluoroktansyra (PFOA) och perfluoroktansulfonat (PFOS), vilket är fokus för detta arbete. Leverorganoiderna kan utsättas för PFOS och PFOA, och mediet de ligger i kan extraheras och studeras med konventionella analytiska metoder för att få en bild av hur PFAS påverkar levern. I detta arbete vill analysen ske via vätskekromatografi med masspektrometri som detektion (LC-MS/MS). Med LC-MS/MS separeras den studerade molekylen, analyten från lösningen baserat på dess kemiska egenskaper. Analyten detekteras baserat på dess massa, mer bestämd massa/laddning-fördelningen (m/z). För att anpassa LC-MS metoden till injektion av komplexa organoidprover inkluderades ett automatiskt filter (AFFL) samt ett extra automatiskt separationssteg med en kolonn med fastfasextraktion (SPE). I övrigt ger SPE möjligheten att små mängder PFAS kan uppkoncentreras och fokuseras på kolonnen, vilket ger en sensitiv metod som kan detektera låga koncentrationer. SPE och AFFL implementerades båda för att bättre kunna separera och detektera PFOS och PFOA från andra ämnen, samt filtrera bort föroreningar och stora molekyler som kan skada LC-MS/MS instrumentet i längden. Då PFAS hopar upp sig i vår omgivning, visade det sig att kontamination av PFAS från systemet blev en utmaning under metodutvecklingen. Därför implementerades PFAS fritt utstyr, samt en extra kolonn för att fånga PFAS från systemet och på så sätt minska bakgrundskontaminationen som detekterades.    AFFL-SPE-LC-MS/MS metoden optimerades via en maskininlärningsbaserad optimeringsmetod baserad på parametrar i LC och MS. Metoden baserar sig på att, med tre värden för varje parameter, uppger programmet ett antal experiment som måste utföras för att kunna beräkna ett optimalt värde för varje parameter. Med resultatet från experimenten kan modellen matematiskt, genom en Bayes baserat Gaussian modell, uppskatta optimala värden för metoden. På så sätt kunde metoden optimeras systematiskt och tidseffektivt.    Innan rutinanvändning måste den optimerade metoden valideras. Validering blev gjord genom at följa Eurachem’s riktlinjer. Metoden visade hög repeterbarhet, selektivitet och riktighet. Den har hög sensitivitet, och kan detektera låga mängder, men bakgrundskontaminationen kunde inte elimineras totalt, och gör att man måste korrigera för detta i rutinanalyser. Komplexiteten av AFFL-SPE-LC-MS/MS med flera kolonner och filter gjorde att metoden visade låg robusthet och behövde justeras ofta. AFFL-SPE-LC-MS/MS metoden gör det möjligt att snabbt studera PFOS och PFOA i leverorganoider och utstyr använt i organoidanalyser, och kan bidra i forskningen för att bättre förstå hur PFAS påverkar levern. / Health Effects of Persistent Organic Pollutants
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