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Information Freshness and Packet Drop Rate Interplay in a Two-User Multi-Access Channel
Emmanouil Fountoulakis,Themistoklis Charalambous,Nikolaos Nomikos,Anthony Ephremides,Nikolaos Pappas 한국통신학회 2022 Journal of communications and networks Vol.24 No.3
In this work, we combine the two notions of timelydelivery of information to study their interplay; namely, deadlineconstrainedpacket delivery due to latency constraints andfreshness of information. More specifically, we consider a twousermultiple access setup with random access, in which user 1is a wireless device with a buffer and has external bursty trafficwhich is deadline-constrained, while user 2 monitors a sensorand transmits status updates to the destination. We provideanalytical expressions for the throughput and drop probabilityof user 1. For user 2, we derive in closed form the age ofinformation distribution, the average age of information (AoI),and the probability the AoI to be larger than a certain valuefor each time slot. The relations reveal a trade-off between theaverage AoI of user 2 and the drop rate of user 1: the lower theaverage AoI, the higher the drop rate, and vice versa. Simulationscorroborate the validity of our theoretical results.
One-year Outcome of First vs. Later Episode Schizophrenia: A Real-world Naturalistic Study
Konstantinos N. Fountoulakis,Panagiotis Panagiotidis,Antonis T. Theofilidis,Ioannis Nimatoudis 대한정신약물학회 2020 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.18 No.3
Objective: The aim the study was to calculate remission, recovery and relapse rates in first episode patients with schizophrenia (FES) vs. patients at a later phase (non-FES). Methods: Thirty-two FES and 101 non-FES patients took part in the study. The assessment included testing at baseline and at 1 year with the Positive and Negative Syndrome Scale (PANSS), Calgary Depression scale, State-Trait Anxiety Inventory (STAI), Udvalg for Kliniske Undersøgelser (UKU) scale, Simpson Angus, and General Assessment of Functioning (GAF) subscale. The statistical analysis included chi-square test and analysis of covariance. Results: At baseline 15.62% FES vs. 10.89% non-FES patients were in remission; none of FES vs. 2.97% non-FES patients were in recovery. At endpoint, the respective figures were 12.50% vs. 25.00% and 3.12% vs. 3.96%. None of the differences in rates was significant between the two groups except from the percentage of patients being under medication (higher in the non-FES group). Baseline PANSS negative subscale (PANSS-N) was the only predictor of the outcome at endpoint. Conclusion: The current study reported very low rates of remission and recovery of patients with schizophrenia without any differences between FES and non-FES patients. One possibility is that the increased antipsychotic treatment compensates for the worsening of the illness with time. An accumulating beneficial effect of antipsychotic treatment suggested that early lack of remission is not prognostic of a poor outcome.
Hamacher, Michael,Apweiler, Rolf,Arnold, Georg,Becker, Albert,Blü,ggel, Martin,Carrette, Odile,Colvis, Christine,Dunn, Michael J.,Frö,hlich, Thomas,Fountoulakis, Michael,van Hall, André WILEY-VCH Verlag 2006 Proteomics Vol.6 No.18
<P>The Human Proteome Organisation (HUPO) initiated several projects focusing on the proteome analysis of distinct human organs. The Brain Proteome Project (BPP) is the initiative dedicated to the brain, its development and correlated diseases. Two pilot studies have been performed aiming at the comparison of techniques, laboratories and approaches. With the help of the results gained, objective data submission, storage and reprocessing workflow have been established. The biological relevance of the data will be drawn from the inter-laboratory comparisons as well as from the re-calculation of all data sets submitted by the different groups. In the following, results of the single groups as well as the centralised reprocessing effort will be summarised and compared, showing the added value of this concerted work.</P>