Secure and Lightweight Cluster-Based User Authentication Protocol for IoMT Deployment.

Authentication is considered one of the most critical technologies for the next generation of the Internet of Medical Things (IoMT) due to its ability to significantly improve the security of sensors. However, higher frequency cyber-attacks and more intrusion methods significantly increase the security risks of IoMT sensor devices, resulting in more and more patients' privacy being threatened. Different from traditional IoT devices, sensors are generally considered to be based on low-cost hardware designs with limited storage resources; thus, authentication techniques for IoMT scenarios might not be applicable anymore.

Interaction Effects of Life Events and Hair Cortisol on Perceived Stress, Anxiety, and Depressive Symptoms Among Chinese Adolescents: Testing the Differential Susceptibility and Diathesis-Stress Models.

The differential susceptibility model and the diathesis-stress model on the interaction effect between the individuals' traits and environmental factors will be conducive to understand in depth whether the psychophysiological traits are the risk factors of child development. However, there is no study focusing on the activity of the hypothalamic-pituitary-adrenal (HPA) axis. We examined whether the HPA activity serves as a physiological marker of the differential susceptibility model or the diathesis-stress model by exploring the interactive effect of life events and hair cortisol on perceived stress, anxiety, and depressive symptoms among Chinese adolescents.

Hair cortisol levels and symptoms of anxiety and depression in Chinese adolescents: Comparison between incarcerated and community populations.

Hair cortisol has been proposed as a temporally integrated measure of systemic cortisol suitable for studies of chronic stress. We compared hair cortisol and depressive and anxiety symptoms between two groups of healthy male adolescents differing in exposure to chronic stress, one attending regular high school (n = 33) and the other incarcerated for 11-867 days in juvenile detention (n = 29), and examined the association of hair cortisol and depressive and anxiety symptoms among all adolescents. Hair cortisol was determined by liquid chromatography tandem mass spectrometry, and depressive and anxiety symptoms were measured by the Self-Rating Depression and Anxiety Scales.

Performance Analysis of a Novel Hybrid S-ALOHA/TDMA Protocol for Beta Distributed Massive MTC Access.

Simultaneous random access of massive machine type communications (MTC) devices are expected to cause congestion in the radio access network. Not only the performance of MTC, but the coexisting human to human (H2H) communications would also degrade dramatically without an appropriate medium access control (MAC) protocol. However, most existing solutions focus on the random access procedure without dealing with the sunsequent data transmission procedure.

Intraindividual stability of cortisol and cortisone and the ratio of cortisol to cortisone in saliva, urine and hair.

Background: Cortisol, cortisone and the ratio of cortisol to cortisone in saliva, urine and hair are acute, short-term and long-term biomarkers to reliably assess the activity of hypothalamic-pituitary-adrenal (HPA) axis and 11β-hydroxysteroid dehydrogenase (11β-HSD). One key issue is whether these biomarkers have intraindividual relative stability. Salivary, urinary and hair cortisol was proven to show considerable long-term intraindividual relative stability.

Characteristics of novel hair-based biomarker for the activity assessment of 11β-hydroxysteroid dehydrogenase.

Background: The ratio of hair cortisol to cortisone (R(hcc)) would be a potential biomarker to assess long-term activity of 11β-hydroxysteroid dehydrogenase (11β-HSD). Hair cortisol concentration in human varied with positions of hair segments in hair shaft, head locations of hair sampling and treatment methods of hair samples. However, currently unknown is whether these factors influence the determination of R(hcc) value.

Time course of cortisol loss in hair segments under immersion in hot water.

Background: Hair cortisol is supposed to be a good biomarker of chronic stress. Major loss of hair cortisol in long-term exposure to environmental factors affected strongly its proper assessment of chronic stress in human. However, there was no research on time course of hair cortisol loss during the long-term exposure.

Spectrum sharing in cognitive radio networks--an auction-based approach.

Cognitive radio is emerging as a promising technique to improve the utilization of the radio frequency spectrum. In this paper, we consider the problem of spectrum sharing among primary (or "licensed") users (PUs) and secondary (or "unlicensed") users (SUs). We formulate the problem based on bandwidth auction, in which each SU makes a bid for the amount of spectrum and each PU may assign the spectrum among the SUs by itself according to the information from the SUs without degrading its own performance.