iSixSigma

Stefan Szemkus

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  • #179947

    Stefan Szemkus
    Participant

    Dear Bower Chiel,
    thank you very much for the detailled reply. I will get the papers and do the CI calculations.
    If I do all three recommended calculations (2-variances-test, Cpk-calculation and CI-calculation) that should give evidence enough to prove significance, shouldn’t it.
    Best regards,
    Stefan

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    #179945

    Stefan Szemkus
    Participant

    Dear Eoin,
    thank you very much for answering my question.
    I’m very angry with myself, because the way you proposed to prove significance should have come into my mind too.
    Again, thank you very much!
    Best regards,
    Stefan

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    #179944

    Stefan Szemkus
    Participant

    Dear remi,
    thank you very much for the quick reply on my question. I was really astonished that you bothered with my problem in that short time.
    Would you say it is not necessary to prove the significance on the improvement? I always have been teached to prove those things, but perhaps that is not the way it works in practice.
    If I want to execute a 2-variances-test, what are the degrees of freedom I have to choose? Could you help me also with this question?
    Thank you very much in advance,
    Stefan

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    #57603

    Stefan Szemkus
    Participant

    Dear DM,just a few companies I know are: Ford, Linde Group, Deutsche Bank, AXA, Deutsche Bahn, ThyssenKrupp, T-Systems, T-Mobile, Arcor. There are many more. However, most do not run a full Six Sigma program but apply Six Sigma in selected areas.You may also want to check out the European Six Sigma Club Deutschland e.V. at http://www.sixsigmaclub.de for more information.Best regards,
    Stefan

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    #57271

    Stefan Szemkus
    Participant

    Klaus,
    to replicate means to repeat the entire design. A 2**3 full factorial DOE contains 8 cornerpoints (=combinations). If you do 2 replicates you have to do 16 runs, so you repeat every treatment combination once. This allows, like mentioned in an earlier answer, the estimation of your experimental error.
    Repeat is the repetiton of a single treatment combination. If your process does not allow fast changes (continues process like tube mill) replicates are very difficult so its adequate to take multiple sample at the same teatment combination.

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    #132535

    Stefan Szemkus
    Participant

    The control limits are normally recalculated only when the process has been changed in some substantial way.
    More importantly, why are you maintaining SPC charts? What is the goal? If you hope to use SPC to identify “special causes” and eliminate them, you need to investigate what happened to the process at the times you see signals on the chart.

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    #56627

    Stefan Szemkus
    Participant

    Hey there,
    basically what you do with box cox transformation is to raise your data by the power of lambda. including the specs. Minitab tries lambdas between -5 and + 5 (for example if lambda is -1 its like data*1/x or if lambda is 1/2 it is the sqrt from your data) to find a minimum standard devia´tion. The lambda that leads to minimum std dev. is choosen.
    This only works if the data is not bi-modal and the min. value is at least half of the max. value.
    Stefan

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    #56626

    Stefan Szemkus
    Participant

    Paul,
    thanks a lot for your reply. 2 weeks ago I had a course called research methods and most of your points ring a bell inside my head.
    I guess I would prefer to do a case study linked to my daily job which is being a MBB for an automotive supplier.
    My favourite topics are linked to Six Sigma and Lean in general. In particular I am very interested in project selection criterias, training content and the usage in projects, financial impact and validation of projects and there are a lot of interesting questions more coming from daily issues dealing with six sigma and lean. The theme of your dissertation sounds very interessting since half of the projects I support are fixed if the processes are in the condition they supposed to be. My difficulty is to understand how I can turn this kind of more practical problems and experience into a academic dissertation.Would be great to stay in touch and to learn about your experience.
    Thanks!
    Stefan

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    #56625

    Stefan Szemkus
    Participant

    Hi Alex,
    thanks for your reply. I am located in Germany. Currently I am supporting one of our european business units in deploying six sigma europeanwide with 30 BBs. Our program is running quite well after a very long and difficult start.
    My aim is somehow to combine what I do in my day to day job with my dissertation. I thought about a case study. But…. there are so many interessting areas like project selection, link to lean, training aspects, etc. Any example or recommendation is highly appreciated.
    Thanks!
    Stefan

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    #90033

    Stefan Szemkus
    Participant

    Jorge,
    is it free?
    Would it be possible to get a copy?
    [email protected]
    Thanks!

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    #89957

    Stefan Szemkus
    Participant

    @s.o. who applied Six Sigma approach successfully:
    I found out that 6S is a consequent alliance of the following approaches:   -Process Reengineering (a)   -Process Management   (b)   -Continous Process Improvement (c)and hount the following approaches in comparison to conventional Quality Management approaches:
    Process Reengineering  (a)conventional:-elimination of one defect, while basic structure of workflow persistsSix Sigma:-identification of critical inputs wich involve the problem/defects and/or variants
    Process Management   (b)conventional :-phase tendet process improvement in the result of inadequat customer satisfactionSix Sigma-consolidation of process improvement and process design-replace the old process with improved or new one
    Continous Process Improvement (c)Six Sigma-detecting process efficiency and problem identification-process optimizing and design   –>performance rate, competitiv ability, increase profit
    My questions:Refer to s.o. experiences and knowledge I need to know how the realization of the 6S approaches are running at e.g. the Auto Financial Industry. It would be the best discribed on examples.
    Thanks
    Stefan
     

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    #89946

    Stefan Szemkus
    Participant

    Hi Jim,
    can you tell me, which position in what company you have?
    Else I need to know, what is the basic for the numbers you mentioned (5-15% improvement -TQM, and up to 100% with 6S)?
    Have you a safty source for telling this or are they out of your experiences?
    Thanks
    Stefan

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Viewing 12 posts - 1 through 12 (of 12 total)