Publications by authors named "Xiatian Zhang"

3 Publications

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UrbanMotion: Visual Analysis of Metropolitan-Scale Sparse Trajectories.

IEEE Trans Vis Comput Graph 2020 May 4;PP. Epub 2020 May 4.

Visualizing massive scale human movement in cities plays an important role in solving many of the problems that modern cities face (e.g., traffic optimization, business site configuration). In this work, we study a big mobile location dataset that covers millions of city residents, but is temporally sparse on the trajectory of individual user. Mapping sparse trajectories to illustrate population movement poses several challenges from both analysis and visualization perspectives. In the literature, there are a few techniques designed for sparse trajectory visualization; yet they do not consider trajectories collected from mobile apps that possess long-tailed sparsity with record intervals as long as hours. This work introduces UrbanMotion, a visual analytics system that extends the original wind map design by supporting map-matched local movements, multi-directional population flows, and population distributions. Effective methods are proposed to extract and aggregate population movements from dense parts of the trajectories leveraging their long-tailed sparsity. Both characteristic and anomalous patterns are discovered and visualized. We conducted three case studies, one comparative experiment, and collected expert feedback in the application domains of commuting analysis, event detection, and business site configuration. The result demonstrates significance and effectiveness of our system in completing key analytics tasks for urban users.
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http://dx.doi.org/10.1109/TVCG.2020.2992200DOI Listing
May 2020

Clinical Efficacy and Safety of Electroacupuncture in Migraine Treatment: A Systematic Review and Network Meta-Analysis.

Am J Chin Med 2019 4;47(8):1755-1780. Epub 2019 Dec 4.

Key Laboratory of Chinese Internal, Medicine of MOE and Beijing, P. R. China.

Considering the heavy burden of migraine, it is essential to update insufficient and/or outdated clinical evidence supporting electroacupuncture (EA) in migraine therapy. In this study, a literature search of seven medical databases was performed. After data extraction and quality evaluation, 13 randomized controlled trials, including 1559 patients, were assessed in this analysis. Results demonstrated that EA was superior to control treatment (Western medicine, sham-EA, blank control, acupuncture, and acupoint catgut embedding) according to the visual analog scale (VAS) score, frequency of headache attack (Western medicine, sham-EA, blank control), self-rating anxiety scale (SAS [blank control]), self-rating depression score (SDS [Western medicine and blank control]), and clinical efficiency (Western medicine and sham-EA) after treatment (). Results of network meta-analysis (for VAS, SAS, and SDS) demonstrated statistically significant differences in VAS scores for EA compared with sham-EA, acupuncture with sham-EA, acupoint catgut embedding with sham-EA, and acupoint catgut embedding with blank control. Rank probability analysis of VAS, SAS, and SDS scores all demonstrated that EA ranked first. Most studies were symmetrically distributed on both sides of the midline in funnel plots for VAS, SAS, and SDS, which indicated a low likelihood of small sample effects. Sensitivity analysis confirmed the stability of the studies included in this research. EA is one of several effective treatments for migraine pain symptoms, and, to some extent, anxiety and depression. Nevertheless, multi-center studies with large sample sizes and/or well-designed randomized controlled trials (RCTs) will be needed in the future.
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http://dx.doi.org/10.1142/S0192415X19500897DOI Listing
April 2020

Statins for the Primary Prevention of Coronary Heart Disease.

Biomed Res Int 2019 29;2019:4870350. Epub 2019 Jan 29.

Key laboratory of Chinese Internal Medicine of Ministry of Education and Beijing, Dongzhimen Hospital, Beijing University of Chinese Medicine, Beijing, China.

Object: The purpose of this study was to fully assess the role of statins in the primary prevention of coronary heart disease (CHD).

Methods: We searched six databases (PubMed, the Cochrane Library, Web of Science, China National Knowledge Infrastructure, Wanfang Database, and Chinese Scientific Journal Database) to identify relevant randomized controlled trials (RCTs) from inception to 31 October 2017. Two review authors independently assessed the methodological quality and analysed the data using Rev Man 5.3 software. Risk ratios and 95% confidence intervals (95% CI) were pooled using fixed/random-effects models. Funnel plots and Begg's test were conducted to assess publication bias. The quality of the evidence was evaluated using the Grading of Recommendations Assessment, Development and Evaluation (GRADE) approach.

Results: Sixteen RCTs with 69159 participants were included in this review. Statins can effectively decrease the occurrence of angina (RR=0.70, 95% CI: 0.58~0.85, I =0%), nonfatal myocardial infarction (MI) (RR=0.60, 95% CI: 0.51~0.69, I =14%), fatal MI (RR=0.49, 95% CI: 0.24~0.98, I =0%), any MI (RR=0.53, 95% CI: 0.42~0.67, I =0%), any coronary heart events (RR=0.73, 95% CI: 0.68~0.78, I=0%), coronary revascularization (RR=0.66, 95% CI: 0.55~0.78, I = 0%), and any cardiovascular events (RR=0.77, 95% CI: 0.72~82, I = 0%). However, based on the current evidence, there were no significant differences in CHD deaths (RR=0.82, 95% CI: 0.66~1.02, I=0%) and all-cause mortality (RR=0.88, 95% CI: 0.76 ~1.01, I =58%) between the two groups. Additionally, statins were more likely to result in diabetes (RR=1.21, 95% CI: 1.05~1.39, I =0%). There was no evidence of publication biases, and the quality of the evidence was considered moderate.

Conclusion: Statins seemed to be beneficial for the primary prevention of CHDs but have no effect on CHD death and all-cause mortality.
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http://dx.doi.org/10.1155/2019/4870350DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6374814PMC
June 2019