Scaling of human behavior during portal browsing

We investigate transitions of portals users between different subpages. A weighted network of portals subpages is reconstructed where edge weights are numbers of corresponding transitions. Distributions of link weights and node strengths follow power laws over several decades. Node strength increases faster than linearly with node degree. The distribution of time spent by the user at one subpage decays as power law with exponent around 1.3. Distribution of numbers P(z) of unique subpages during one visit is exponential. We find a square root dependence between the average z and the total number of transitions n during a single visit. Individual path of portal user resembles of self-attracting walk on the weighted network. Analytical model is developed to recover in part the collected data.Comment: 6 pages, 7 figure

Pengaruh Persepsi Kemudahan Penggunaan Dan Persepsi Kegunaan Terhadap Niat Untuk Menggunakan Dan Penggunaan Aktual Teknologi Pembayaran Digital QRIS

The purpose of this study was to test and analyze the technology acceptance model which consists of the variables perceived ease of use, perceived benefits, intention to use and actual use of QRIS digital payment technology. The population in this study were students of the Faculty of Economics and Business, University of Kutai Kartanegara who used QRIS. The research sample is 60 students who use QRIS digital payment technology. Sampling used purposive sampling technique and data analysis tool used Structural Equation Modeling (SEM) using SmartPLS 4 software version 4.8.9. Based on the results of research where Perceived Ease of Use has a positive and significant effect on Intention to Use with t-statistics > t-table (2.049 > 1.96) so that the first hypothesis is accepted and proven true. Perceived usefulness has a positive and significant effect on intention to use with t-statistics > t-table (3.861 > 1.96) so that the second hypothesis is accepted and proven true. Intention to use has a positive and significant effect on actual use with t-statistics > t-table (5.514 > 1.96) so that the third hypothesis is accepted and proven true.Abstract: The purpose of this study was to test and analyze the technology acceptance model which consists of the variables perceived ease of use, perceived benefits, intention to use and actual use of QRIS digital payment technology. The population in this study were students of the Faculty of Economics and Business, University of Kutai Kartanegara who used QRIS. The research sample is 60 students who use QRIS digital payment technology. Sampling used purposive sampling technique and data analysis tool used Structural Equation Modeling (SEM) using SmartPLS 4 software version 4.8.9. Based on the results of research where Perceived Ease of Use has a positive and significant effect on Intention to Use with t-statistics > t-table (2.049 > 1.96) so that the first hypothesis is accepted and proven true. Perceived usefulness has a positive and significant effect on intention to use with t-statistics > t-table (3.861 > 1.96) so that the second hypothesis is accepted and proven true. Intention to use has a positive and significant effect on actual use with t-statistics > t-table (5.514 > 1.96) so that the third hypothesis is accepted and proven true

Update on Fermion Mass Models with an Anomalous Horizontal U(1) Symmetry

We reconsider models of fermion masses and mixings based on a gauge anomalous horizontal U(1) symmetry. In the simplest model with a single flavon field and horizontal charges of the same sign for all Standard Model fields, only very few charge assignements are allowed when all experimental data, including neutrino oscillation data, is taken into account. We show that a precise description of the observed fermion masses and mixing angles can easily be obtained by generating sets of the order one parameters left unconstrained by the U(1) symmetry. The corresponding Yukawa matrices show several interesting features which may be important for flavour changing neutral currents and CP violation effects in supersymmetric models.Comment: 23 pages, 8 figure

Global and regional prevalence and outcomes of COVID-19 in people living with HIV: A cutting-edge systematic review and meta-analysis

BACKGROUND: The relationship between HIV infection and COVID-19 clinical outcome is uncertain, with conflicting data and hypotheses. We aimed to assess the prevalence and risk of severe COVID-19 and death in people living with HIV (PLWH) on the global and continental level. METHODS: Electronic databases were systematically searched in July 2021. Studies were screened and then extracted following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. Narratives were synthesised and data pooled for global and continental prevalence and relative risk of severity and mortality in HIV-infected COVID-19 patients using random-effect model. Risk of bias was assessed using the Newcastle-Ottawa score, Egger’s test and presented as funnel plots. RESULTS: A total of 46 studies were included involving 18,034,947 COVID-19 cases of which 31,269 were PLWH. The global prevalence of PLWH with SARS-CoV-2 infection was 1% (95% CI = 0.9% -1.1%) with the highest prevalence observed in sub-Saharan Africa. The relative risk (RR) of COVID-19 severity was significant only in Africa (RR, 95% CI = 1.14, 1.08 – 1.24) while risk of COVID-19 mortality was 1.53% (95% CI = 1.45 – 2.03) globally. The prevalence of PLWH in COVID-19 cases was significantly low, and the calculated global risk ratio show that HIV infection may be linked with increased COVID-19 death. The between-studies heterogeneity was significantly high while risk of publication bias was not significant. CONCLUSION: There is low prevalence of HIV-SARS-CoV-2 co-infection. HIV infection was linked with severe COVID-19 in Africa and increased risk of death globally