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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.
1

A comparative study of Tosoh G11 and Bio-Rad D-100 analyzers for HbA1c analysis / En jämförande studie av Tosoh G11 och Bio-Rad D-100 för HbA1c -analys

Alvin, Maja, Lundin, Filippa January 2023 (has links)
Diabetes mellitus is one of the most common diseases worldwide. The continued prevalence increase, together with the complexity of the disease with severe long-term complications makes efficient diagnostical and monitorial methods very important. The determination of glycated hemoglobin, HbA1c, plays an important role in both, underlying the importance of high-quality analytical instruments. Whenever a new instrument is introduced into routine clinical use an evaluation is needed. This study evaluated the agreement between the new Tosoh G11 HbA1c high performance liquid chromatography system as a replacement for the Bio-Rad D-100 at the Chromatographic Department of the Institute of Laboratory Medicine, Faculty of Medicine, University of Debrecen. In total, 66 samples were analyzed using both analyzers and a Bland-Altman comparison was performed together with a correlation study. Additionally, a linearity check, optimal error and routine error testing was carried out specifically for the Tosoh G11. The results showed high agreement between measurements, r=0.9975 (p<0.001) for HbA1c mmol/mol and r=0.9971 (p<0.001) for HbA1c %. High repeatability and accuracy were observed of the Tosoh G11 with the highest variation coefficient of 1.50 % and linearity r =0.9999. The conducted study supports the replacement of the Bio-Rad D-100 to the Tosoh G11. / Diabetes mellitus är en av de vanligaste världsomfattande sjukdomarna. Fortsatt prevalensökning, tillsammans med den komplexa sjukdomsbilden innefattande allvarliga långsiktiga komplikationer gör effektiva diagnostiska och övervakande metoder väldigt viktiga. Bestämning av glykerat hemoglobin, HbA1c, spelar en viktig roll i båda, vilket kräver att analysinstrument av hög kvalitet finns. När ett nytt instrument introduceras inom kliniska rutinanalyser krävs utvärdering. Denna studie utvärderade överrensstämmelsen mellan det nya Tosoh G11 HbA1c högupplösande vätskekromatografisystemet som en ersättning för Bio-Rad D-100 på den kromatografiska enheten av laboratoriemedicin på Debrecens universitet. Totalt analyserades 66 prov med respektive instrument och Bland-Altman jämförelse genomfördes tillsammans med en korrelationsstudie. Dessutom utfördes ett linjäritetstest, optimal- och rutinfeltest specifikt för Tosoh G11. Resultaten visade en hög överrensstämmelse mellan mätningarna, r=9975 (p<0.001) för HbA1c mmol/mol och r =9971 (p<0.001) för HbA1c %. Tosoh G11 visade hög repeterbarhet och noggrannhet, med den högsta variationskoefficient på endast 1.50 % och en linjäritet på r=0.9999. Den genomförda studien stödjer Tosoh G11 som ersättning för Bio-Rad D-100.
2

Uma investigação da correspondência entre mutações e avisos relatados por ferramenta de análise estática / Investigating the correspondence between mutations and static warnings reported by static analysis tool

Araújo, Claudio Antônio de 04 December 2015 (has links)
Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2016-04-18T13:33:01Z No. of bitstreams: 2 Dissertação - Cláudio Antônio de Araújo - 2015.pdf: 6483664 bytes, checksum: bf12aa2fbdc30e9456d8036d9cc24fd1 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2016-04-18T13:34:40Z (GMT) No. of bitstreams: 2 Dissertação - Cláudio Antônio de Araújo - 2015.pdf: 6483664 bytes, checksum: bf12aa2fbdc30e9456d8036d9cc24fd1 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Made available in DSpace on 2016-04-18T13:34:40Z (GMT). No. of bitstreams: 2 Dissertação - Cláudio Antônio de Araújo - 2015.pdf: 6483664 bytes, checksum: bf12aa2fbdc30e9456d8036d9cc24fd1 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2015-12-04 / Traditionally, mutation testing is used for test set and/or test criteria evaluation once it is considered a good fault model. Since static analyzers, in general, report a substantial number of false positive warnings, Objective: This paper uses mutation testing for evaluating an automated static analyzer. The intention of this study is to define a prioritization approach of static warnings based on their correspondence with mutations. Method: We used mutation operators as a fault model to evaluate the direct correspondence between mutations and static warnings. The main advantage of using mutation operators is that they generate a large number of programs containing faults of different types, which can be used to decide the ones most probable to be detected by static analyzers. Results: The results obtained for a set of open-source programs indicate that: 1) correspondence exists when considering specific mutation operators such that static warnings may be prioritized based on their correspondence level with mutations; 2) correspondence exists when considering specific warning categories such that, assuming we perform static analysis considering these warning categories, mutation operators may be prioritized based on their correspondence level with warnings. Conclusion: It is possible to provide an incremental testing strategy aiming at reducing the cost of both static analysis and mutation testing using the correspondence information. On the other hand, knowing that Mutation Test has a high application cost, we identified mutations of some specific mutation operators, which an automatic static analyzer is not able to detect. Therefore, this information can used to prioritize the order of applying mutation operators incrementally considering, firstly, those with no correspondence with static warnings. / Considerando que: 1) analisadores estáticos automatizados são ferramentas que emitem avisos, sem que seja necessário a execução do produto de software correspondente, alertando sobre a presença de possíveis defeitos no código. Uma das críticas a tais ferramentas é a grande quantidade de avisos falsos positivos emitidos, isto é, avisos relatados que não correspondem a defeitos reais, mas demandam tempo de análise por parte do desenvolvedor; 2) tradicionalmente, o Teste de Mutação tem sido utilizado para avaliar (e melhorar) a qualidade de conjuntos de casos de teste e/ou de critérios de teste, uma vez que é considerado um bom gerador de defeitos de software. Objetivo: O objetivo do presente trabalho é investigar a correspondência entre avisos estáticos e mutações e, com isso, verificar quais avisos estão mais relacionados a esses possíveis defeitos (mutações) e, assim, possivelmente, serem avisos verdadeiros positivos. Método: Os operadores de mutação são utilizados neste trabalho como um modelo de defeitos para avaliar a correspondência entre mutações e avisos estáticos. A principal vantagem da utilização de operadores de mutação é que eles geram um grande número de programas com defeitos de diferentes tipos. Esses tipos de defeitos são usados em estudos experimentais para investigar a capacidade dos analisadores estáticos em detectá-los. Resultados: Os resultados obtidos com estudos experimentais para um conjunto de sistemas de código aberto indicam que existe correspondência quando são considerados alguns operadores de mutação da μJava e alguns tipos de avisos da FindBugs. Conclusão: Os resultados obtidos podem ser utilizados de duas maneiras distintas: Primeiro, é fornecida uma abordagem de análise incremental dos avisos, de acordo com o grau de correspondência com mutações. Segundo, com o objetivo de reduzir o custo do Teste de Mutação é fornecida uma abordagem de priorização incremental para análise dos mutantes dos operadores cujas mutações são menos “percebidas” pela FindBugs.

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