Research on High Reliability Planning Method in Electric Wireless Network

2020 ◽  
pp. 1382-1392
Author(s):  
Zewei Tang ◽  
Chengzhi Jiang
Keyword(s):  
Wireless Network ◽  
High Reliability ◽  
Planning Method ◽  
Reliability Planning

scholarly journals Development and Application of Methane Leakage Monitoring System for Gas Transmission Pipeline

2021 ◽  
Vol 5 (6) ◽  
pp. 44-49
Author(s):  
Qijun Wang ◽  
Shiqi Wei
Keyword(s):  
Wireless Network ◽  
Oil And Gas ◽  
High Reliability ◽  
Gas Pipeline ◽  
Sensor System ◽  
Ultra Low Power ◽  
Methane Gas ◽  
Wide Range ◽  
Transmission Pipeline ◽  
Leakage Monitoring

Oil and gas pipeline transportation, as a relatively safe way of oil and gas transportation, undertakes most of the transportation tasks of crude oil and natural gas. Oil and gas pipeline accidents affect a wide range of consequences. Therefore, the oil and gas pipeline leakage detection is paid more and more attention. In this paper, ultra-low power methane gas sensor is selected to collect methane gas concentration in the air, and wireless network technology is used to build a wireless network sensor system with 4G function. Through the sensor distribution along the pipeline, it can intuitively and accurately judge whether there is a micro-leakage in the pipeline, and understand the diffusion situation after the leakage. The sensor system has high reliability and stability, and has high value of popularization and application.

scholarly journals On multiplexing data streams using trellis-coded modulation in centralized wireless networks

2021 ◽  
pp. 52-59
Author(s):  
Nikita Yankovskii ◽  
Igor Pastushok
Keyword(s):  
Wireless Networks ◽  
Wireless Network ◽  
Error Rate ◽  
Performance Indicators ◽  
High Reliability ◽  
Key Performance Indicators ◽  
Low Latency ◽  
Media Access Control ◽  
Mac Layers ◽  
Simultaneous Transmission

Problem statement: The proliferation of services and applications requiring ultra-low latency and high reliability of data transmission in communication networks leads to creating new approaches and architectures in order to ensure the simultaneous transmission of Enhanced Mobile Broadband (eMBB) and Ultra-Reliable and Low Latency Communication (URLLC)  traffic. Providing efficient eMBB and URLLC multiplexing schemes with preset key performance indicators for each stream is the most challenging problem in wireless network development. Purpose: To provide a simultaneous transmission of eMBB and URLLC streams without reducing the user experience of eMBB services by developing a multiplexing scheme and the coherent architecture of physical (PHY) and media access control (MAC) layers in the downlink channel. Results: An eMBB and URLLC multiplexing scheme has been proposed, along with a coherent architecture for PHY and MAC layers, ensuring the given wireless network key performance indicators. The proposed solution performance has been estimated by simulation. The multiplexing scheme outperforms the baseline solution in Bit Error Rate and Frame Error Rate metrics. The coherent PHY and MAC layers architecture provides transmission with an arrival rate of 400 messages per millisecond and 99% message delivery probability in one millisecond. Practical relevance: The obtained results allow communication system developers to deploy centralized wireless networks at industrial objects.

scholarly journals A mission planning method for multi-satellite wide area observation

2019 ◽  
Vol 16 (6) ◽  
pp. 172988141989071 ◽  
Author(s):  
Hao-ran Ji ◽  
Di Huang
Keyword(s):  
Time Allocation ◽  
Planning Process ◽  
High Reliability ◽  
Satellite Observation ◽  
Planning Method ◽  
Mission Planning ◽  
Wide Area ◽  
Significant Information ◽  
Short Time ◽  
Remaining Time

Space-based Earth observation is now developing rapidly because of the advantages in coverage, convenience, and flexibility. However, it is difficult for one single satellite to realize the quick observation of wide areas. In order to catch all the significant information of a wide area in a short time, multi-satellite observation mission would be proposed. In this article, a mission planning method for online multi-satellite wide area observation is established to serve future multi-satellite observation missions. Firstly, a method for area division is proposed, and the whole area is divided into subareas. Then the multi-satellite observation path planning is realized by a strategy of path deduction. After that, a remaining time allocation method to maximize the observation gazing time of each subarea is proposed. Finally, the algorithms for the whole mission planning process are provided. Numerical simulations show that the mission planning method is able to ensure the complete coverage of different wide target areas, with high reliability and low computational complexity.

Failure Analysis With the Scanning Electron Microscope

1972 ◽  
Vol 30 ◽  
pp. 482-483
Author(s):  
John R. Devaney
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Integrated Circuits ◽  
Failure Analysis ◽  
High Reliability ◽  
Military Applications ◽  
Small Structure ◽  
Useful Life ◽  
Insight Into ◽  
Scanning Electron

Occasionally in history, an event may occur which has a profound influence on a technology. Such an event occurred when the scanning electron microscope became commercially available to industry in the mid 60's. Semiconductors were being increasingly used in high-reliability space and military applications both because of their small volume but, also, because of their inherent reliability. However, they did fail, both early in life and sometimes in middle or old age. Why they failed and how to prevent failure or prolong “useful life” was a worry which resulted in a blossoming of sophisticated failure analysis laboratories across the country. By 1966, the ability to build small structure integrated circuits was forging well ahead of techniques available to dissect and analyze these same failures. The arrival of the scanning electron microscope gave these analysts a new insight into failure mechanisms.

Sign in / Sign up

Export Citation Format

Share Document