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  • 101.
    Vännman, Kerstin
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Matematiska vetenskaper.
    Dunkels, Andrejs
    Luleå tekniska universitet.
    Att vara detektiv bland siffror från verkligheten1985Inngår i: Nämnaren : tidskrift för matematikundervisning, ISSN 0348-2723, nr 4, s. 69-Artikkel i tidsskrift (Annet vitenskapelig)
  • 102.
    Vännman, Kerstin
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Matematiska vetenskaper.
    Dunkels, Andrejs
    Luleå tekniska universitet.
    Kreativ statistik med EDA1984Bok (Annet (populærvitenskap, debatt, mm))
  • 103.
    Vännman, Kerstin
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Matematiska vetenskaper.
    Hubele, Norma
    The distribution of Cpm when using a pooled variance estimator with some results2001Inngår i: 2001 proceedings, American Statistical Association: papers presented at the annual meeting of the American Statistical Association: joint statistical meetings, Atlanta, Georgia, August 5 - 9, 2001, and other ASA-sponsored conferences, Acoustical Society of America (ASA), 2001Konferansepaper (Fagfellevurdert)
  • 104.
    Vännman, Kerstin
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Matematiska vetenskaper.
    Hubele, Norma Faris
    Arizona State University.
    Distributional properties of estimated capability indices based on subsamples2003Inngår i: Quality and Reliability Engineering International, ISSN 0748-8017, E-ISSN 1099-1638, Vol. 19, nr 2, s. 111-128Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Under the assumption of normality, the distribution of estimators of a class of capability indices, containing the indices , , and , is derived when the process parameters are estimated from subsamples. The process mean is estimated using the grand average and the process variance is estimated using the pooled variance from subsamples collected over time for an in-control process. The derived theory is then applied to study the use of hypothesis testing to assess process capability. Numerical investigations are made to explore the effect of the size and number of subsamples on the efficiency of the hypothesis test for some indices in the studied class. The results for and indicate that, even when the total number of sampled observations remains constant, the power of the test decreases as the subsample size decreases. It is shown how the power of the test is dependent not only on the subsample size and the number of subsamples, but also on the relative location of the process mean from the target value. As part of this investigation, a simple form of the cumulative distribution function for the non-central -distribution is also provided

  • 105.
    Vännman, Kerstin
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Matematiska vetenskaper.
    Hubele, Norma Faris
    The effect of subsample sizes on Cpm when using pooled and un-pooled variance estimators2001Rapport (Annet vitenskapelig)
  • 106.
    Vännman, Kerstin
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Matematiska vetenskaper.
    Klefsjö, Bengt
    Luleå tekniska universitet, Institutionen för ekonomi, teknik och samhälle, Industriell Ekonomi.
    Ärligare undersökningar tack vare slumpen1983Inngår i: Elementa : tidskrift för matematik, fysik och kemi, ISSN 0013-5933, nr 1, s. 30-34Artikkel i tidsskrift (Annet (populærvitenskap, debatt, mm))
  • 107.
    Vännman, Kerstin
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Matematiska vetenskaper.
    Kotz, Samuel
    A superstructure of capability indices: asymptotics and its implications1995Inngår i: International Journal of Reliability, Quality and Safety Engineering (IJRQSE), ISSN 0218-5393, Vol. 2, nr 4, s. 343-360Artikkel i tidsskrift (Fagfellevurdert)
  • 108.
    Vännman, Kerstin
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Matematiska vetenskaper.
    Kotz, Samuel
    University of Maryland.
    A superstructure of capability indices: distributional properties and implications1995Inngår i: Scandinavian Journal of Statistics, ISSN 0303-6898, E-ISSN 1467-9469, Vol. 22, nr 4, s. 477-491Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A family of capability indices, containing the indices Cp, Cpk, Cpm, and Cpmk, has earlier been defined by {\it K. Vännman} [Stat. Sin. 5, No. 2, 805-820 (1995). for the case of two-sided specification intervals. By varying the parameters of the family various indices with suitable properties can be obtained. Under the assumption of normality an explicit form of the distribution of the family of the estimated indices is provided. Numerical investigations are made to explore the behavior of the estimators of the indices for different values of the parameters. A decision rule, based on the estimator, that can be used to determine whether the process can be considered capable or not is provided and suitable criteria for choosing an index from the family are suggested.

  • 109.
    Vännman, Kerstin
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Matematiska vetenskaper.
    Kulachi, Murat
    Informatics and Mathematical Modelling, Technical University of Denmark.
    A model free approach to eliminate autocorrelation when testing for process capability2006Rapport (Annet vitenskapelig)
  • 110.
    Vännman, Kerstin
    et al.
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Matematiska vetenskaper.
    Kulahci, Murat
    Informatics and Mathematical Modelling, Technical University of Denmark.
    A model-free approach to eliminate autocorrelation when testing for process capability2008Inngår i: Quality and Reliability Engineering International, ISSN 0748-8017, E-ISSN 1099-1638, Vol. 24, nr 2, s. 213-228Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    There is an increasing use of on-line data acquisition systems in industry. This usually leads to autocorrelated data and implies that the assumption of independent observations has to be re-examined. Most decision procedures for capability analysis assume independent data. In this article we present a new way of performing capability analysis when data are autocorrelated. This method is based on what can be called the 'iterative skipping' strategy. In that, by skipping a pre-determined number of observations, e.g. considering every fifth observation, the data set is divided into subsamples for which the independence assumption may be valid. For each such subsample of the data we estimate a capability index. Then traditional tests, assuming independence, can be performed based on each estimated capability index from the subsamples. By combining the information from each test statistic based on the subsamples in a suitable way, a new and efficient decision procedure is obtained. We discuss different ways of combining the information from these individual tests. A main appeal of our proposed method is that no time-series model is needed.

  • 111.
    Zairov, Rustem R.
    et al.
    Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, Kazan.
    Nagimov, Rinas N.
    Kazan National Research Technological University.
    Sudakova, Svetlana N
    Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, Kazan.
    Lapaev, Dmitry V
    Zavoisky Physical-Technical Institute, Federal Research Center “Kazan Scientific Center of RAS”, Kazan.
    Syakaev, Victor V
    Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, Kazan.
    Gimazetdinova, Gulnaz Sh
    Kazan National Research Technological University.
    Voloshina, Alexandra D
    Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, Kazan.
    Shykula, Mykola
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Matematiska vetenskaper.
    Nizameev, Irek R
    Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, Kazan.
    Samigullina, Aida I
    Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, Kazan.
    Gubaidullin, Aidar T
    Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, Kazan.
    Podyachev, Sergey N
    Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, Kazan.
    Mustafina, Asiya R
    Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, Kazan.
    Polystyrenesulfonate-coated nanoparticles with low cytotoxicity for determination of copper(II) via the luminescence of Tb(III) complexes with new calix[4]arene derivatives2018Inngår i: Microchimica Acta, ISSN 0026-3672, E-ISSN 1436-5073, Vol. 185, nr 8, artikkel-id 386Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The authors describe new ligands with two 1,3-diketone groups and two heteroaromatic (pyridyl or quinolyl) moieties embedded to the upper and lower rims of dibromo-substituted calix[4]arene scaffold. The ligands bind Tb(III) ions in alkaline DMF solutions to form 1:1 complexes. The strong Tb(III)-centered luminescence (with excitation/emission peaks at 330/545 nm) of the complexes results from efficient ligand-to-metal energy transfer. The complexes were incorporated into polystyrenesulfonate (PSS) colloids by diluting a DMF solution of the complex with aqueous solution of PSS. The luminescence of the colloids is quenched by copper(II), and this was used to develop a method for its fluorometric determination in nanomolar concentrations. The lower limit of detection is 0.88 nM. Quenching is a result of (a) ion exchange which converts the terbium complexes into their copper counterparts, and (b) energy transfer from Tb(III) to Cu(II) complexes. The low cytotoxicity of the colloidal nanoprobe conceivably makes it a promising tool for use in cellular imaging.

123 101 - 111 of 111
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