Technology and Health Care - Volume 23, issue s2

Authors: Yang, Fan | Yang, Qing | Liu, Xingxing | Wang, Pan

Article Type: Research Article

Abstract: BACKGROUND: Susceptible-Infected-Susceptible (SIS) infectious disease outbreaks are hazardous events. However, if governments sectors do not adequately supervise such outbreaks, these infectious diseases could spread significantly, resulting in large economic losses and social issues. OBJECTIVE: In this paper, an evolutionary game and simulation model based on the interactions between strategies and states was proposed, and the game between the public and government sectors and its impact on epidemic situations was discussed. METHODS: Replicator dynamics equations and the multi-agent model simulation were used for analysis. RESULTS: According to replicator dynamics equations …as well as the multi-agent model simulation, the public all eventually adopted the mobility strategy. In addition, the supervision strength of the governmental sectors was equal to 0 after the strength fluctuated at a low level under the trigger strategy. Ultimately, the entire public shifted to the S state throughout the course of the emergency. CONCLUSIONS: Social order was maintained and social loss was controlled to a certain extent in the final analysis. Show more

Keywords: SIS evolution, evolutionarily stable strategy, evolution game, replicator dynamics equations, cellular automata, multi-agent simulation

DOI: 10.3233/THC-150999

Citation: Technology and Health Care, vol. 23, no. s2, pp. S603-S613, 2015

Authors: Shi, Han | Du, Dong | Xu, JianFeng | Su, Zhihong | Peng, Qiyu

Article Type: Research Article

Abstract: BACKGROUND: Despite being the conventional choice, whole body PET cameras with a 76 cm diameter ring are not the optimal means of human brain imaging. OBJECTIVE: In fact, a dedicated brain PET with a better geometrical structure has the potential to achieve a higher sensitivity, a higher signal-to-noise ratio, and a better imaging performance. METHODS: In this study, a polyhedron geometrical dedicated brain PET (a dodecahedron design) is compared to three other candidates via their geometrical efficiencies by calculating the Solid Angle Fractions (SAF); the three other candidates include a spherical cap …design, a cylindrical design, and the conventional whole body PET. RESULTS: The spherical cap and the dodecahedron have an identical SAF that is 58.4% higher than that of a 30 cm diameter cylinder and 5.44 times higher than that of a 76 cm diameter cylinder. The conceptual polygon-shape detectors (including pentagon and hexagon detectors based on the PMT-light-sharing scheme instead of the conventional square-shaped block detector module) are presented for the polyhedron PET design. Monte Carlo simulations are performed in order to validate the detector decoding. CONCLUSIONS: The results show that crystals in a pentagon-shape detector can be successfully decoded by Anger Logic. The new detector designs support the polyhedron PET investigation. Show more

Keywords: Positron emission tomography (PET), brain imaging, polyhedron geometry

DOI: 10.3233/THC-151000

Citation: Technology and Health Care, vol. 23, no. s2, pp. S615-S623, 2015