STUDYING RADIO COMMUNICATION ORGANIZATION MODELS AT ELIMINATING MAN-MADE DISASTERS BY UNITS OF THE STATE FIRE SERVICE

2021 ◽  
Vol 4 ◽  
pp. 30-39
Author(s):  
Basov V. ◽  
◽  
Kholostov A. ◽  
Keyword(s):  
Communication Network ◽  
Fire Service ◽  
The State ◽  
Radio Communication ◽  
Radio Communications ◽  
Fire Extinguishment ◽  
Fire Extinguishing ◽  
Allowable Range ◽  
Time Parameters ◽  
Network States

Purpose. The organization of communication in fire service units at eliminating consequences of man-made disasters or fire extinguishing at the site has its own features, which are determined by the officials’ interaction procedure. The article considers the features of private cases models of radio communication organization in the units of the State Fire Service at the site of fire extinguishment or elimination of man-made disasters. Probabilistic characteristics of these models have been investigated. Methods. The authors analyzed the existing officials’ interaction models using radio communication directly at the site and in the process of eliminating man-made disasters. Findings. Graphical dependencies of probabilities of communication network states on time parameters of radio exchange are presented. It is determined that at organizing and controlling communication at the site of fire extinguishment or elimination of man-made disasters, knowing the required characteristics of the communication network (including the probability of being in critical and free states), it is possible to determine the allowable range for the values λ (frequency of the need for communication) and µ (rate of communication channel release). Research application field. The obtained results can be used in organizing and managing radio communications for ensuring safety at fire extinguishment and elimination of man-made disasters. Conclusions. It is shown that the interaction process of fire extinguishment and elimination of man-made disasters subjects depends on the use of radio communication facilities. Under certain conditions, critical modes may occur in radio network, which will interfere with means and forces management, as well as affect the safety of the participants of this process. In this case, the task of radio communication control will be to estimate the possibility of occurrence and exclusion of critical modes, which can be done on the basis of the obtained dependencies of communication network states probabilities on time parameters of radio exchange.

scholarly journals Performance of Base Stations in Railway Digital Radio Communication Networks

2021 ◽  
Vol 19 (2) ◽  
pp. 41-48
Author(s):  
Yu. V. Nemtsov ◽  
I. V. Seryogin ◽  
P. I. Volnov
Keyword(s):  
Communication Network ◽  
Communication Networks ◽  
Base Station ◽  
Base Stations ◽  
Radio Communication ◽  
Radio Communications ◽  
Digital Radio ◽  
Cargo Transportation ◽  
Assess Quality

Base station (BS) is a terminal device of a radio communication network, while railway radio communications play an important role in ensuring safety of passenger and cargo transportation.A proposed method for calculating the performance of base stations in railway digital radio communication networks is intended to calculate for the BS the probabilities of being in certain state.BS was decomposed and such functional elements as circuit groups and a radio frequency path were identified, as well as the central module ensuring the exchange of information with elements of this BS and with other BSs. A detailed study of each element has increased accuracy of the proposed method. Following the Markov model, BS is presented as a system in which all possible states are considered. Models for BS with two and three circuit groups have been constructed. The parameters of each functional element of the model can be obtained through observation over a certain period. The solution of the system of equations for each of the models presented in the article will allow obtaining the values of the system being in a certain state. The obtained characteristics can be used to calculate the reliability of the entire radio communication network, and then to assess quality of service provided to the users of this network.Conclusions are made about the possibilities of using the obtained models when designing new railway communication networks and when calculating quality indices of existing ones. The proposed models can be applied not only to railway radio communication networks but also to mobile communication networks of commercial operators. 

scholarly journals OPTIMALISASI HMI SCADA UNTUK MONITORING DAN KONTROL REPEATER RADIO KOMUNIKASI MENGGUNAKAN MODEM GPRS INTEK J65i-X

2014 ◽  
Vol 18 (1) ◽  
pp. 27
Author(s):  
Al Anamila Nur Aufa ◽  
Teguh Yuwono
Keyword(s):  
Real Time ◽  
Radio Signal ◽  
Supply Voltage ◽  
The State ◽  
Communication Process ◽  
Monitoring And Control ◽  
Radio Communication ◽  
Radio Communications ◽  
Central Java ◽  
And Control

Al Anamila Nur Aufa, Teguh Yuwono, in paper SCADA HMI optimization for monitoring and control repeater using radio communication modem GPRS INTEK J65i–X explain that radio communications at PT PLN ( Persero ) APD Central Java and Yogyakarta is still a major communication medium for coordinating the work , both maintenance and handling of interference between units . Repeaters in this case an important role in the communication process between APD dispatcher JTY with Area - Area and officers in the field because of the presence of the communication range of the repeater spacing becomes wider . In operation repeaters can be susceptible to interference that can result in radio communications in the areas covered by the repeater to be disrupted so that the communication between the dispatcher APD JTY with Area - Area and field workers to be blocked. Handling repeater for this disorder is not maximized due to the lack of real time monitoring of the state of the repeater , so that when the repeater impaired in the device or on the supply , the clerk did not know in person and just waiting for a report from the repeater keeper at any time at the shelter is not a repeater . There needs to be a device that can monitor the state of the repeater , which if detected interference at the source , supply and radio , PPE JTY officer may direct monitoring , so that it can assist in the handling and analysis of causes of hearing disorders without having to come to the site . GPRS Modem Utilization Intek J65i - X allows retrieval status of the repeater equipment where it can not be done at this time . With facilities tapped digital inputs and digital outputs on the modem , any condition of equipments such as radio signal repeater RX , TX radio signal , battery , charger and 220V supply state of the supply voltage can be detected . From changes in the supply voltage available , can be detected by a GPRS modem Intek J65i - X so that when there is an interruption in the HMI SCADA can termonitoring in real time . With the monitoring and control of a radio repeater communications , personnel no longer need to go to the location (site ) only to find the cause of the disturbance . Interference analysis can also be performed before treatment is held further disruption . Reset control radio can also be done quickly if the radio have to hang in its operation , so that the future will be able to improve the performance of SCADA systems PT PLN ( Persero ) APD Central Java and DI Yogyakarta. Keywords : repeater , modem GPRS Intek J65i - X , auxiliary relays , monitoring and control , HMI SCADA

Resection of bone by sagittal saw: Investigation of effects of blade speed, feed rate, and irrigation on temperature rise

2021 ◽  
pp. 095441192199948
Author(s):  
Ehsan Shakouri ◽  
Pezhman Ghorbani ◽  
Pedram Pourheidari ◽  
Saeed Fotuhi
Keyword(s):  
Temperature Rise ◽  
Feed Rate ◽  
Saline Solution ◽  
Physiological Saline ◽  
The State ◽  
Physiological Saline Solution ◽  
Allowable Range ◽  
Dry Conditions ◽  
Saw Blade ◽  
Oscillation Rate

Heat generation during bone cutting by sagittal saw may lead to temperature rise and possible incidence of thermal necrosis. The aim of the present research is to examine the effect of saw blade oscillation rate, blade feed rate, and irrigation by physiological saline solution on the bone temperature rise during sawing in order to determine the desired conditions for reducing the extent of thermal damage. For this purpose, empirical tests of bovine femur cutting were performed in 15 states, including five levels for the blade oscillation rate (10,000–18,000 cpm with 2000 cpm intervals) and three levels for the feed rate (10–30 mm.min−1 with 10 mm.min−1 intervals) for dry conditions; and five states, including five levels for the blade oscillation rate (10,000–18,000 cpm with 2000 cpm intervals) and one level in feed rate of 20 mm.min−1 for the irrigation conditions. The results indicated that the bone temperature rise had a direct relationship with the blade oscillation rate and an inverse relationship with its feed rate. In the state of no cooling, the minimum temperature rise (Δ T = 65.45°C) occurred at the blade speed of 10,000 cpm and feed rate of 30 mm.min−1, while in the state of sawing with irrigation, the temperature rise almost did not exceed the allowable range (Δ T ≤ 10°C). The results suggested that to lower the possibility of incidence of osteonecrosis in the bone resection by sagittal saw, cooling with physiological saline solution or application of the minimum blade oscillation rate and maximum feed rate is recommended.

Optimal Placement of Near Ground VHF/UHF Radio Communication Network as a Multi Objective Problem

2019 ◽  
Vol 110 (3) ◽  
pp. 1169-1197
Author(s):  
Hisham A. Shehadeh ◽  
Mohd. Yamani Idna Idris ◽  
Ismail Ahmedy ◽  
Hani Ragab Hassen
Keyword(s):  
Communication Network ◽  
Optimal Placement ◽  
Radio Communication ◽  
Multi Objective

The SWARMs Approach to Integration of Underwater and Overwater Communication Sub-Networks and Integration of Heterogeneous Underwater Communication Systems

2018 ◽  
Author(s):  
Francesco Pacini ◽  
Giacomo Paoli ◽  
Iván Cayón ◽  
Tamara Rivera ◽  
Beatriz Sarmiento ◽  
...  
Keyword(s):  
Communication Network ◽  
Communication Systems ◽  
Ad Hoc ◽  
Data Transfer ◽  
Underwater Vehicles ◽  
Variable Number ◽  
Sensor Data ◽  
Radio Communication ◽  
Transfer Rates ◽  
And Control

The management of a heterogeneous mix of underwater vehicles needs a robust and reliable communication network, able to connect the remote command and control station (typically ashore or on board of a support ship) with nodes and vehicles in the deep sea. On the basis of this scenario, the infrastructure shall satisfy requirements such as: medium to extremely long distances between the control room and the area of operation; management of a variable number and type of nodes and vehicles (mobile, fixed, underwater, surfaced); a guaranteed bandwidth to send commands and receive platform status and tasks execution information with minimum latency; a high bitrate to transfer sensor data, pictures and videos in “near real time”; etc. Compared to the available solutions used nowadays for radio communication systems, the underwater environment imposes several constraints on the maximum achievable bandwidth and distance, drastically reducing data transfer rates. This means that the full communication network is a trade-off between different requirements and performances. The SWARMs project approach to this problem is to select, combine and integrate different and heterogeneous communication technologies, components and solutions, in order to obtain the best performances for the management and control of underwater vehicles during the execution of different missions and tasks. The network is mainly based on commercial components, but specific adaptations were made in order to fulfil the requirements of ad hoc underwater and overwater sub networks in maritime specific scenarios. Several experiments and sea trials have allowed the verification of the performance of the full network and the optimization of its configuration according to the mission needs.

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