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1دورية أكاديمية
المصدر: Jisuanji kexue, Vol 49, Iss 4, Pp 362-368 (2022)
مصطلحات موضوعية: set-valued data, medical big data, differential privacy, privacy protection, data utility, Computer software, QA76.75-76.765, Technology (General), T1-995
الوصف: Electronic medical data surges along with the constant development of information technologies and medical care digitalization.It provides foundations for further application on data analysis, data mining and intelligent diagnosis.The fact that me-dical data are massive and involve a lot of patient privacy.How to protect patient privacy while using medical data is challenging.The predominant principle for the solutions is anonymity.It is not competent in confidentiality or availability when attackers possess strong background knowledge.This paper proposes an optimized classification tree and an improved Diffpart.In our design, association of data is introduced to sift set-valued data for DP based perturbation, which satisfies the utility and supports statistic query.Then test is conducted with 240000 practical medical data and the results show that the proposed algorithm holds DP distribution and outperforms Diffpart in privacy and utility.
وصف الملف: electronic resource
العلاقة: https://www.jsjkx.com/fileup/1002-137X/PDF/1002-137X-2022-49-4-362.pdfTest; https://doaj.org/toc/1002-137XTest
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2دورية أكاديمية
المصدر: Jisuanji kexue, Vol 48, Iss 9, Pp 135-139 (2021)
مصطلحات موضوعية: vehicle speed measurement, alignment on region matching, binocular vision, template matching, Computer software, QA76.75-76.765, Technology (General), T1-995
الوصف: Real-time speed measurement is a vital issue to assist truck weighing at the entrance of expressway when a truck passes through a scale.Binocular vision technology technically has the advantages of low cost,easy deployment and high stability,which qualify it a potential for prospective application.The key point for binocular vision based speed measurement is displacement-measuring of a target,which is subject to accurate target matching in multiple frames.This paper presents an alignment algorithm on region matching based on spatial location and a calculation method for spatial displacement based on template ma-tching.Specifically,relative spatial location of a wheel is introduced to restrain its matching area,which effectively reduces the mismatching on similar wheels; template matching is derived to track the key points of a wheel for spatial displacement between multiple frames.The practical traffic video data taken at an expressway entrance is applied to experiments.The results show that,compared with other binocular vision based speed measurement methods,our method declines the RMSE of the speed measurement results by 20%～40%,and it more suitable for the real scene when vehicles pass the speed measurement point at the entrance of expressway at a relatively high speed(10~20 km/h).
وصف الملف: electronic resource
العلاقة: http://www.jsjkx.com/fileup/1002-137X/PDF/1002-137X-2021-9-135.pdfTest; https://doaj.org/toc/1002-137XTest
