Mathematics and Computer Science

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Volume 3, Issue 6, November 2018

  • Robust Time-Varying Kalman State Estimators with Uncertain Noise Variances

    Wenjuan Qi, Zunbing Sheng

    Issue: Volume 3, Issue 6, November 2018
    Pages: 113-128
    Received: 7 September 2018
    Accepted: 19 September 2018
    Published: 4 January 2019
    DOI: 10.11648/j.mcs.20180306.11
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    Abstract: This paper addresses the design of robust Kalman estimators (filter, predictor and smoother) for the time-varying system with uncertain noise variances. According to the unbiased linear minimum variance (ULMV) optimal estimation rule, the robust time-varying Kalman estimators are presented. Specially, two robust Kalman smoothing algorithms are pres... Show More
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  • The Relationship of Delivery Frequency with the Cost and Resource Operational Efficiency: A Case Study of Jingdong Logistics

    Jianbang Du, Yeliang Sun, Huanyu Ren

    Issue: Volume 3, Issue 6, November 2018
    Pages: 129-140
    Received: 24 October 2018
    Accepted: 13 November 2018
    Published: 4 January 2019
    DOI: 10.11648/j.mcs.20180306.12
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    Abstract: Under drastic competition, major express companies have increased their daily delivery frequency to improve customer satisfaction and market share. The inverse relationship of frequency with cost and operational efficiency becomes the key to the decision of delivery frequency. This paper uses JD Logistics as an example to quantitatively analyze the... Show More
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