Octane Wireless (United States)

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The behavioral manifestations and neurophysiological responses to sedation can assist in understanding brain function after neurological damage, and can be described by cortical functional connectivity. Glioma patients may experience neurological deficits that are not clinically detectable before sedation. We hypothesized that patients with gliomas exhibit distinct cortical connectivity patterns compared to non-neurosurgical patients during sedation. This is a secondary analysis of a previously published prospective observational study. Patients scheduled for resection of supratentorial glioma (n=21) or a non-neurosurgical procedure (n=21) under general anesthesia were included in this study. Frontal electroencephalography (EEG) signals were recorded at different sedation levels as assessed by the Observer Assessment of Alertness/Sedation (OAA/S) score. Kernel principal component analysis and k -means clustering were used to determine possible temporal dynamics from the weighted phase lag index characteristics. Ten EEG connectivity states were identified by clustering (76% consistency), each with unique properties. At OAA/S 3, the median (Q1, Q3) occurrence rates of state 6 (glioma group, 0.110 [0.083, 0.155] vs. control group, 0.070 [0.030, 0.110]; P =0.008) and state 7 (glioma group, 0.105 [0.083, 0.148] vs. control group: 0.065 [0.038, 0.090]; P =0.001), which are dominated by beta connectivity, were significantly different between the 2 groups, reflecting differential conversion of the beta band between the left and right brain regions. In addition, the temporal dynamics of the brain's functional connectivity was also reflected in the transition relationships between metastable states. There were differences in EEG functional connectivity, which is dynamic, between the glioma and nonglioma groups during sedation.

This article proposes a fast over-the-air (OTA) test method in a reverberation chamber (RC) for measuring the total isotropic sensitivity (TIS) of large-orm-factor wireless device. The mechanism of this method results from the principle of strict complementarity in radiation patterns between total radiated power (TRP) and TIS at the same frequency. Due to this, the measurement of the TIS can be transferred to a co-frequency full test of the TRP and the effective isotropic sensitivity (EIS) of a single sampling state, thereby markedly accelerating the test speed of TIS in comparison to the conventional power-stepping method. Furthermore, the high-precision calibration and the testing of the EIS enhance the accuracy of the test. This fast TIS testing method provides a fast and accurate solution for the OTA measuring of the large-sized wireless devices such as household appliances with wireless modules, particularly during the massive production testing phase.

In this paper we present some recent advancements in antenna/photonic device integration for radio? over fiber applications. In our direct integration investigations we divide our approach based on frequency bands; below 6 GHz and above 26 GHz (Ka-band) to be consistent with such applications as present day 5G and 5G+ systems.

This article features an interview with Adant Technologies CEO Dr. Daniele Piazza about his perspectives and experiences in forming a startup company.

Coronavirus disease 2019 (COVID-19), caused by a novel coronavirus, is highly contagious. Global medical systems have been heavily impacted by the COVID-19 pandemic. Although the majority of patients with intracranial disease require time-sensitive surgery, how to conduct neurosurgery and prevent and control nosocomial infection during a pandemic is challenging. We retrospectively reviewed the clinical data of patients undergoing neurosurgical and neurointerventional procedures at Beijing Tiantan Hospital, China during the early stages of the COVID-19 pandemic between January 21 and July 31, 2020. A 3-level system of COVID-19 risk was established based on medical conditions, epidemiologic, and symptom inquiry and the results of triage. A transitional unit was established for patients in whom COVID-19 had not been ruled out on admission to hospital. A total of 4025 patients underwent neurosurgery during the study period, including 768 emergent and 3257 nonemergent procedures. Of these patients, 3722 were low-risk for COVID-19, 303 were moderate-risk, and none were high-risk. In addition, 1419 patients underwent neurointerventional procedures, including 114 emergent and 1305 nonemergent interventions, of which 1339 were low-risk patients, 80 were moderate-risk and none were high-risk. A total of 895 patients (neurosurgical and neurointerventional) were admitted to the transitional unit. Forty-five patients were diagnosed with COVID-19 and transferred to the COVID-19 designated hospital. There were no cases of COVID-19 nosocomial infections among surgical patients or health care workers. On the basis of our single-center experience, developing a full screening protocol for COVID-19, establishing a risk level, and using a transitional unit for those with unknown COVID-19 status are effective measures to provide a safe environment for patients and health care workers.

We experimentally demonstrate a digitally linearized high dynamic range downconverting microwave photonic link. The system is limited in frequency only by the 10 GHz 3-dB bandwidth of the optical modulators used and is demonstrated at 9 GHz. Digital linearization suppresses third order intermodulation distortion by as much as 39 dB. The linearization is shown for a single tone, a two tone, and a 1 MHz bandwidth input signal.

In this paper a design strategy is presented to achieve low reflection coefficients ( 10 %) without the need for external matching structures. The design strategy revolves around critical coupling between multiple resonances within the radiating structure. The strategy is applied to aperture stacked patches and can be applied to other forms of antennas. The theoretical results are validated through experiment.

A patch antenna that fundamentally generates low levels of spurious and cross polarized radiation is presented. The antenna is fed by a probe feed located in the center of the patch conductor thereby minimizing spurious radiation. A slot within the patch conductor is utilized to ensure good impedance matching at the input port of the antenna. Symmetry is incorporated in the shape of the slot to enable low cross polarized radiation to be achieved. In this paper aspects of the design approach are presented and experimental validation is also provided for linearly polarized antennas.

We describe some emerging technologies that are being investigated for the realization of next generation wireless networks capable of supporting multiple standards and meeting capacity demands. The challenges associated with their efficient integration in a converged wireless/optical network are also discussed.