Graph Summarization with Controlled Utility Loss

This paper proposes a Lyapunov optimization-based <a><b> </b></a>online distributed (LOOD) algorithmic framework for active distribution networks with numerous photovoltaic inverters and invert air conditionings (IACs). In the proposed scheme, ADNs can track an active power setpoint reference at the substation in response to transmission-level requests while concurrently minimizing the utility loss and ensuring the security of voltages. In contrast to conventional distributed optimization methods that employ the setpoints for controllable devices only when the algorithm converges, the proposed LOOD can carry out the setpoints immediately relying on the current measurements and operation conditions. Notably, the time-coupling constraints of IACs are decoupled for online implementation with Lyapunov optimization technique. An incentive scheme is tailored to coordinate the customer-owned assets in lieu of the direct control from network operators. Optimality and convergency are characterized analytically. Finally, we corroborate the proposed method on a modified version of 33-node test feeder. <div><br></div>

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g-Sum: A Graph Summarization Approach for a Single Large Social Network

ICST Transactions on Scalable Information Systems ◽

10.4108/eai.23-3-2021.169073 ◽

2021 ◽

pp. 169073

Author(s):

Saif Rehman ◽

Asif Nawaz ◽

Tariq Ali ◽

Naveed Amin

Keyword(s):

Social Network ◽

Graph Summarization

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Sponsorship Bias in Base-Case Values and Uncertainty Bounds of Health Economic Evaluations? A Systematic Review of Herpes Zoster Vaccination

Medical Decision Making ◽

10.1177/0272989x18776636 ◽

2018 ◽

Vol 38 (6) ◽

pp. 730-745 ◽

Cited By ~ 3

Author(s):

Joke Bilcke ◽

Frederik Verelst ◽

Philippe Beutels

Keyword(s):

Health Economic ◽

Herpes Zoster ◽

Incremental Cost ◽

Quality Score ◽

Data Sources ◽

Economic Evaluations ◽

Base Case ◽

Study Quality ◽

Vaccine Protection ◽

Utility Loss

Background. New health technologies are more likely adopted when they have lower incremental cost-effectiveness ratios (ICERs) and/or when their ICER is presented with more certainty. Industry-funded (IF) health economic evaluations use often more favorable base-case values, leading to more favorable conclusions. Purpose. To study whether IF health economic evaluations of varicella-zoster virus vaccination in the elderly use more favorable base-case values and account for less uncertainty than non–industry-funded (NIF) evaluations. Methods. Data source: PubMed. Data extracted: funding source; incremental cost per quality-adjusted life year (QALY) gained; vaccine price; study quality score; base-case values, uncertainty ranges, and data sources for influential parameters: duration of vaccine protection, utility loss due to herpes zoster (HZ) disease, percentage of HZ patients developing postherpetic neuralgia (PHN), and duration of PHN. Data synthesis: qualitative comparisons; Fisher exact test for differences in study quality score and 1-sided Mann-Whitney U tests for differences in base-case values and uncertainty ranges. Results. Despite using the same data sources, IF studies ( n = 10) assume a longer duration of vaccine protection ( U = 56, P = 0.03), have a higher percentage of HZ patients developing PHN ( U = 22/33, P = 0.02/0.03 for ages 60–64/65–69), and tend to use higher HZ utility loss than NIF studies ( n = 11) for their baseline. IF studies show lower ICERs given similar or even higher vaccine prices than NIF studies, consider less uncertainty around the duration of vaccine protection ( U = 8, P < 0.001), and tend to use less uncertainty around the duration of PHN. Yet their quality has been rated equally well, using current standard quality rating tools. Conclusion. Researchers and decision makers should be aware of potential sponsorship bias in health economic evaluations, especially in the way source data are used to specify base-case values and uncertainty ranges.

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