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Re-testing in batch testing Model Based on Quality Control Process for Proportion Estimation

Open Journal of Statistics 2021年第1期11卷 123-136页

作者： Ronald Waliaula Wanyonyi Olivia Wanjeri Mwangi Charles Wambugu Mwangi Department of Mathematics Egerton University Njoro Kenya Data Science Institute University of Delaware Newark DE USA Department of Mathematics and Actuarial Kabarak University Kabarak Kenya

The quality of products manufactured or procured by organizations is an important aspect of their survival in the global market. The quality control processes put in place by organizations can be resource-intensive but substantial savings can be realized by using acceptance sampling in conjunction with batch testing. This paper considers the batch testing model based on the quality control process where batches that test positive are re-tested. The results show that re-testing greatly improves the efficiency over one stage batch testing based on quality control. This is observed using Asymptotic Relative Efficiency (ARE), where for values of p computed ARE > 1 implying that our estimator has a smaller variance than the one-stage batch testing. Also, it was found that the model is more efficient than the classical two-stage batch testing for relatively high values of proportion.

关键词： Quality Control batch testing Cut Off Value Proportion Re-testing

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Development and testing of high precision and stability power supply for high energy photon source

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Radiation Detection Technology and Methods 2024年第2期8卷 1280-1285页

作者： Yang Li Suying Chen Yuting Liu Peng Liu Xiaoling Guo Fengli Long Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China University of Chinese Academy of Sciences Beijing100049China

Purpose The high energy photon source(HEPS)is the fourth-generation synchrotron photon *** with the third-generation synchrotron photon source,the brightness is 100-1000 times higher,and the electron emittance of the storage ring is low to the diffraction limit of *** physical calculations,it is required that the stability of the storage ring quadrupole magnet power supply be better than 10 ppm,and the accuracy of output current be better than 80 *** high demand for technical parameter poses a challenge to the development of high precision and stability power *** The main circuit topology of the power supply adopts a phase-shifted full bridge soft switching scheme,which avoids interference caused by switching noise and improves power stability and *** high-precision digital power supply controller based on FPGA improves the sampling speed and control accuracy of the power supply,and the constant temperature control circuit ensures that the output current of the power supply meets the requirements of HEPS for power supply *** In the batch testing section,a testing facility was built to test the stability,accuracy,repeatability,voltage ripple,and other parameter of high precision and stability power *** a year and a half of testing,the performance tests of 1066 power supplies,including linear accelerators power supplies,booster power supplies,storage rings power supplies,dipole and quadrupole combined power supplies,dipole and quadrupole power supplies,were *** results all met and exceeded the design *** The HEPS high precision and stability power supply meets the design requirements in terms of current stability,accuracy,repeatability,voltage ripple,and other *** batch test results show that the power supply performance using the full bridge phase shifting soft switching technology combined with high-precision digital controller scheme is excellent,a

关键词： Current source Full bridge phase shifting Digital control-High stability batch testing

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