@article{koo_suh_woo_2001, title={Variance tolerancing and decomposition in short-staple spinning processes Part I: Modeling spun yarn strength through intrinsic components}, volume={71}, DOI={10.1177/004051750107100101}, abstractNote={ A variance tolerancing method is developed as a means for separating and estimating random errors associated with raw materials and yarn structures from process-induced errors based on structural relationships governing the strength of a spun yarn. The method is successfully used to estimate the mean and variance of spun yarn strength by propagating the statistical parameters of fiber properties onto those of the resulting spun yarns. In developing the new estimation procedure, probabilistic models based on the distributions of fiber length and tensile properties are combined with geometric and structural models of fiber arrangements in spun yarns. For the first time, the concept of “effective gauge length” is used to model and simulate the breakage process of spun yarns. The new concept and specific methodology are aimed at better controlling process and product characteristics by quantifying the variances according to their sources. }, number={1}, journal={Textile Research Journal}, author={Koo, H. J. and Suh, M. W. and Woo, J. L.}, year={2001}, pages={1–7} }
 @article{suh_koo_woo_2001, title={Variance tolerancing and decomposition in short-staple spinning processes part II: Simulations and applications to ring and OE spun yarns}, volume={71}, ISSN={["0040-5175"]}, DOI={10.1177/004051750107100203}, abstractNote={ The variance tolerancing and decomposition method developed in Part I of this paper is applied to a large amount of fiber and yarn test data obtained from a spinning mill during a three-year period. The variabilities of single-end strengths found in six different ring spun and open-end yarns are successfully decomposed into random and processinduced variance components by tolerancing the variances of the matching fiber length and tensile properties. A total of 43,080 single-end yarn strength tests, 4,200,000 AFIS® fiber lengths, and over 70,000 Mantis® single-fiber tensile tests are performed for the required parameter estimation, simulation, and model validation. The results confirm that variance tolerancing through “effective gauge length” and other intrinsic components is effective for variance estimation and decomposition. Most significant is that the processinduced variances account for 69-82% of the total yarn strength variations, signifying the importance of and challenges in controlling and reducing process variances in spun yarn manufacturing. }, number={2}, journal={TEXTILE RESEARCH JOURNAL}, author={Suh, MW and Koo, HJ and Woo, JL}, year={2001}, month={Feb}, pages={105–111} }
 @article{kim_jasper_suh_woo_2000, title={Effect of measurement principle and measuring field on uniformity measures of spun yarns}, volume={70}, ISSN={["0040-5175"]}, DOI={10.1177/004051750007000704}, abstractNote={ The effect of measuring field length on yarn evenness is investigated by comparing the coefficient of variation or CV of the measure obtained from three different sensors with different measurement principles: a capacitance sensor with an 8 mm sensing zone, an optical sensor with a 2 mm sensing zone, and a laser scanner with a 1 mm effective sensing zone. A probabilistic model is developed to predict the different CV values obtained from the different instruments, and the results are compared with experimental values. }, number={7}, journal={TEXTILE RESEARCH JOURNAL}, publisher={SAGE Publications}, author={Kim, J and Jasper, WJ and Suh, MW and Woo, JL}, year={2000}, month={Jul}, pages={584–587} }
 @article{suh_woo_koo_1997, title={Spinning quality/process improvement through variance tolerancing}, volume={1}, number={1997}, journal={Beltwide Cotton Conferences. Proceedings}, author={Suh, M. W. and Woo, J. L. and Koo, H. J.}, year={1997}, pages={691–696} }