scholarly journals SoftPSN: Software-Defined Resource Slicing for Low-Latency Reliable Public Safety Networks

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Anteneh A. Gebremariam ◽  
Muhammad Usman ◽  
Riccardo Bassoli ◽  
Fabrizio Granelli
Keyword(s):  
Public Safety ◽  
First Responders ◽  
Base Station ◽  
Low Latency ◽  
Radio Resource ◽  
Life Saving ◽  
Before And After ◽  
Simulation Results ◽  
Emergency Scenarios ◽  
Safety Applications

Achieving the low-latency constraints of public safety applications during disaster could be life-saving. In the context of public safety scenarios, in this paper, we propose an efficient radio resource slicing algorithm that enables first responders to deliver their life-saving activities effectively. We used the tool of stochastic geometry to model the base station distribution before and after a disaster. In addition, under this umbrella, we also proposed an example of public safety scenario, ultrareliable low-latency file sharing, via in-band device-to-device (D2D) communication. The example scenario is implemented in NS-3. The simulation results show that radio resource slicing and prioritization of first responders resources can ensure ultrareliable low-latency communication (URLLC) in emergency scenarios.

Fem Simulation of Micro-Rotating-Structures and Their Applications in Measurement of Residual Stresses in Thin Films

1997 ◽  
Vol 505 ◽  
Author(s):  
Xin Zhang ◽  
Tong-Yi Zhang ◽  
Yitshak Zohar
Keyword(s):  
Thin Films ◽  
Residual Stresses ◽  
Fem Simulation ◽  
Sensitivity Factor ◽  
Local Measurement ◽  
Micro Structure ◽  
Micro Raman Spectroscopy ◽  
Before And After ◽  
Polysilicon Films ◽  
Simulation Results

ABSTRACTFEM simulation of micro-rotating-structures was performed for local measurement of residual stresses in thin films. A sensitivity factor is introduced, studied and tabulated from the simulation results. The residual stress can be evaluated from the rotating deflection, the lengths of rotating and fixed beams, and the sensitivity factor. The micro-structure technique was applied to measure residual stresses in both silicon nitride and polysilicon thin films, before and after rapid thermal annealing (RTA), and further confirmed by wafer curvature method. Residual stresses in polysilicon films at different RTA stages were also characterized by micro-Raman spectroscopy (MRS). The experimental results indicate that micro-rotating-structures indeed have the ability to measure spatially and locally residual stresses in MEMS thin films with appropriate sensitivities.

scholarly journals Latency optimization for D2D-enabled parallel mobile edge computing in cellular networks

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Yan Cai ◽  
Liang Ran ◽  
Jun Zhang ◽  
Hongbo Zhu
Keyword(s):  
Cellular Networks ◽  
Optimal Solution ◽  
Vital Role ◽  
Base Stations ◽  
Low Latency ◽  
Mobile Edge Computing ◽  
System Delay ◽  
Simulation Results ◽  
And Task ◽  
Parallel Communication

AbstractEdge offloading, including offloading to edge base stations (BS) via cellular links and to idle mobile users (MUs) via device-to-device (D2D) links, has played a vital role in achieving ultra-low latency characteristics in 5G wireless networks. This paper studies an offloading method of parallel communication and computation to minimize the delay in multi-user systems. Three different scenarios are explored, i.e., full offloading, partial offloading, and D2D-enabled partial offloading. In the full offloading scenario, we find a serving order for the MUs. Then, we jointly optimize the serving order and task segment in the partial offloading scenario. For the D2D-enabled partial offloading scenario, we decompose the problem into two subproblems and then find the sub-optimal solution based on the results of the two subproblems. Finally, the simulation results demonstrate that the offloading method of parallel communication and computing can significantly reduce the system delay, and the D2D-enabled partial offloading can further reduce the latency.

Abstract 138: A Before and After Study of Active Compression Decompression Cardiopulmonary Resuscitation With the Impedance Threshold Device in a Large Urban Pre-Hospital System

Circulation ◽  
2018 ◽  
Vol 138 (Suppl_2) ◽  
Author(s):  
Johanna C Moore ◽  
Michael Grahl ◽  
Tracy Marko ◽  
Ariel Blythe-Reske ◽  
Amber Lage ◽  
...  
Keyword(s):  
Cardiac Arrest ◽  
Cardiopulmonary Resuscitation ◽  
Response Time ◽  
First Responders ◽  
The United States ◽  
Threshold Device ◽  
Before And After ◽  
Mechanical Cpr ◽  
Impedance Threshold Device ◽  
Before And After Study

Introduction: Active Compression Decompression cardiopulmonary resuscitation with an impedance threshold device (ACD+ITD CPR) is available for use in the United States. However, little is known regarding integration of this CPR system into a large urban prehospital system with short response times, routine use of mechanical CPR and ITD, and transport of patients to cardiac arrest centers. This is an ongoing before and after study of the implementation of ACD+ITD CPR in non-traumatic cardiac arrest cases 6 months pre and post protocol change. Hypothesis: Neurologically intact rates of survival, defined by Cerebral Performance Category (CPC) score of 1 or 2, would be higher post protocol. Methods: Basic life support first responders (n = 420) and paramedics (n = 207) underwent training including didactic and hands-on sessions to learn ACD+ITD CPR. The protocol included ACD+ITD CPR initially, with the option to transition to mechanical CPR at 15 minutes. Demographics, response time, CPR duration, initial rhythm, signs of perfusion during CPR, and return of spontaneous circulation (ROSC) were recorded prospectively by first responders. Chart review was performed to determine survival to hospital admission and CPC score at discharge. Results: Training occurred October 2016 to March 2017, with protocol change on May 1, 2017. Cases from November 2016-April 2017 (n = 136) and May 2017-November 2017 (n= 103) were reviewed. Complete data were available for 128 subjects pre-protocol change (94%) and 96 subjects (94%) post. Age, gender, response time, rhythm, total CPR time, and rates of bystander CPR and witnessed arrest were similar between groups. Post protocol change, 87% (89/102) received ACD+ITD CPR with median ACD+ITD CPR time of 15 minutes (range 2-300). Pre-protocol, 6/128 (4.7%) subjects survived with CPC score 1 or 2, versus 8/96 (13.5%) subjects post (difference 8.8%, 95% CI 1%-17%). ROSC rates were similar (pre: 54/127, 42.5% post: 44/93, 47%, difference 4.8%, 95% CI -8% - 18%) Conclusions: The change in protocol was straightforward with a high rate of adherence of the system for the recommended duration of therapy. Results are suggestive of a higher rate of neurological survival with the routine use of ACD+ITD CPR in a small cardiac arrest patient population.

Traffic Flow Characteristics on a Three-Lane Rural Highway in Finland: Results from Empirical Studies and Simulations

1997 ◽  
Vol 1572 (1) ◽  
pp. 33-42 ◽  
Author(s):  
Åsa Enberg ◽  
Matti Pursula
Keyword(s):  
Traffic Flow ◽  
Flow Rate ◽  
Empirical Studies ◽  
Flow Characteristics ◽  
Field Studies ◽  
Optimum Length ◽  
Before And After ◽  
Traffic Flow Characteristics ◽  
Simulation Results ◽  
Rural Highway

The traffic-flow characteristics on an experimental, 20-km-long three-lane highway section in Finland were studied. The sections of highway that have a separate passing lane consist of three lanes. The central lane is assigned alternately to each direction as a passing lane with a length of 1.05 to 1.70 km. The lengths of the no-overtaking zones between successive passing lanes are 1.5 to 4.0 km. The traffic-flow characteristics on the three-lane highway have been observed by comprehensive before-and-after field studies and complementary simulations. Because it was possible to use passing lanes, the number of overtakings on the three-lane highway was remarkably higher than on the former two-lane highway. The overall average travel speeds were slightly higher, and the speed decreased a little more slowly with increasing flow on the three-lane compared with the two-lane highway. Overall platooning and mean platoon lengths decreased as a result of platoon dispersal on the passing lanes. The speeds used in the passing lanes were clearly higher than in the basic lanes. According to the simulation results, the optimum length for a single passing lane was between 0.5 and 2.5 km depending on flow rate and measure of effectiveness. For the actual three-lane highway conditions, passing lanes 1.0 to 1.5 km long seemed to bring the most benefits.

scholarly journals Massive MIMO: Achievable Energy Efficiency for 5G systems with Multi-user Environment

2019 ◽  
Vol 8 (2) ◽  
pp. 6527-6534
Keyword(s):  
Energy Efficiency ◽  
Power Consumption ◽  
Path Loss ◽  
Antenna System ◽  
Base Station ◽  
Small Cells ◽  
Limiting Factors ◽  
Improve Energy Efficiency ◽  
User Terminal ◽  
Simulation Results

Massive Multi-Input and Multi-Output (MIMO) antenna system potentially provides a promising solution to improve energy efficiency (EE) for 5G wireless systems. The aim of this paper is to enhance EE and its limiting factors are explored. The maximum EE of 48 Mbit/Joule was achieved with 15 user terminal (UT)s. This problem is related to the uplink spectral efficiency with upper bound for future wireless networks. The maximal EE is obtained by optimizing a number of base station (BS) antennas, pilot reuse factor, and BSs density. We presented a power consumption model by deriving Shannon capacity calculations with closed-form expressions. The simulation result highlights the EE maximization with optimizing variables of circuit power consumption, hardware impairments, and path-loss exponent. Small cells achieve high EE and saturate to a constant value with BSs density. The MRC scheme achieves maximum EE of 36 Mbit/Joule with 12 UTs. The simulation results show that peak EE is obtained by deploying massive BS antennas, where the interference and pilot contamination are mitigated by coherent processing. The simulation results were implemented by using MATLAB 2018b.

scholarly journals Test and Evaluation of Patient Tracking Platform: Use of Near Field Communication

2020 ◽  
Vol 5 (4) ◽  
pp. 193-198
Author(s):  
Nahid Tavakoli ◽  
◽  
Mohammad Yarmohammadian ◽  
Ali Samimi ◽  
◽  
...  
Keyword(s):  
Near Field ◽  
First Responders ◽  
Base Station ◽  
Red Cross ◽  
Near Field Communication ◽  
Patient Tracking ◽  
Test And Evaluation ◽  
Medical Response ◽  
Server Software ◽  
Smart Mobile

Background: In an earthquake situation, medical response communities such as field and referral hospitals are challenged with injured victims’ identification and tracking. Materials and Methods: In our project, a patient tracking platform (PTP) was developed where first responders triage the patients with an electronic tag that report the location and some information of each patient during his/her movement. This platform includes: 1) Near Field Communication (NFC) tags (ISO 14443), 2) Smart mobile phones (Android-based version 4.2.2), 3) Base station laptops (Windows), 4) Server software, 5) Android software to use by first responders, 5) Disaster Command software, and 6) System Architecture. Results: Our model has been completed through literature review, Delphi technique, focus group, design the platform, and implementation in an earthquake exercise. Test and evaluation of PTP platform were done collaborating with Red Cross staff successfully. Conclusion: It is demonstrated the robustness of the patient tracking platform (PTP) in tracking six patients in a simulated earthquake situation in the yard of the relief and rescue department of Isfahan’s Red Crescent.

scholarly journals Game-based cache allocation strategy for ICN slicing

2021 ◽  
Vol 336 ◽  
pp. 05030
Author(s):  
Liping Ge ◽  
Jinhe Zhou
Keyword(s):  
Equilibrium Solution ◽  
Base Station ◽  
Virtual Network ◽  
Game Model ◽  
Allocation Strategy ◽  
Newton Iterative Method ◽  
Content Acquisition ◽  
Simulation Results ◽  
Cache Allocation ◽  
Cooperative Game Model

To reduce the delay of content acquisition, this paper proposes a game-based cache allocation strategy in the Information-Centric Network (ICN) slice. The cache resource allocation of different mobile virtual network operators (MVNOs) is modeled as a non-cooperative game model. The Newton iterative method is used to solve this problem, and the cache space allocated by the base station for each MVNO is obtained. Finally, the Nash equilibrium solution is obtained. Simulation results show that the proposed algorithm can reduce the delay.

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