scholarly journals A High Performance Target Tracing Transmission Model Oriented to Lifecycle Maximization

2016 ◽  
Vol 2016 ◽  
pp. 1-11
Author(s):  
Zhong-Nan Zhao ◽  
Pei-Li Qiao ◽  
Jian Wang
Keyword(s):  
High Speed ◽  
High Performance ◽  
Network Performance ◽  
Transmission Rate ◽  
Relay Node ◽  
High Rate ◽  
Transmission Model ◽  
Limited Resources ◽  
Speed Sensor ◽  
Rate Transmission

For the high speed sensor networks applications such as Internet of Things, multimedia transmission, the realization of high-rate transmission under limited resources has become a problem to be solved. A high speed transmission and energy optimization model oriented to lifecycle maximization is proposed in this paper. Based on information-directed mechanism, the energy threshold set and the relay node distance selection will be done in the process of target tracing, as a result, retaining a balance between transmission rate and energy consumption. Meanwhile, multiagent coevolution is adopted to achieve the maximum of network lifecycle. Comparing with the relevant methods, indexes for network such as hops, throughput, and number of active nodes, standard deviation of remaining energy, and the network lifecycle are considered, and the simulated experiments show that the proposed method will promote the transmission rate effectively, prolong the network lifecycle, and improve network performance as a whole.

Research on L-PPM Modulation Rate of Pulse Fiber Lasers

2014 ◽  
Vol 926-930 ◽  
pp. 1787-1790
Author(s):  
Zi Qiang Hao ◽  
Hong Zuo Li ◽  
Xin Ren
Keyword(s):  
Fiber Laser ◽  
Peak Power ◽  
Transmission Rate ◽  
Repetition Frequency ◽  
High Rate ◽  
High Peak Power ◽  
Device Processing ◽  
Rate Transmission ◽  
Modulation Rate ◽  
Pulsed Fiber Laser

Compared with continuous laser, pulsed fiber laser has the advantages of high peak power, which is widely used in device processing, military defense and other areas. As the repetition frequency of pulsed fiber laser is low and therefore it cannot realize high rate transmission, this paper does the research on L-PPM modulation of pulsed fiber laser to find a method of effectively improving the modulation rate of pulsed fiber laser. Experimental results show that the L-PPM modulation can improve the transmission rate of the pulsed fiber laser whose repetition frequency is 200K to 1.387Mbps. The research results are useful for the application of pulsed fiber laser in communication.

scholarly journals Congestion Control Mechanism for Intermittently Connected Wireless Network

2016 ◽  
Vol 2016 ◽  
pp. 1-10
Author(s):  
Ruyan Wang ◽  
Yang Tang ◽  
Junjie Yan
Keyword(s):  
Congestion Control ◽  
Wireless Network ◽  
Network Performance ◽  
Control Mechanism ◽  
Relay Node ◽  
Limited Resources ◽  
Packet Size ◽  
Network State ◽  
Congestion Control Mechanism ◽  
Intermittently Connected

Based on the “storing-carrying-forwarding” transmission manner, the packets are forwarded flexibly in Intermittently Connected Wireless Network (ICWN). However, due to its limited resources, ICWN can easily become congested as a large number of packets entering into it. In such situation, the network performance is seriously deteriorated. To solve this problem, we propose a congestion control mechanism that is based on the network state dynamic perception. Specifically, through estimating the congestion risk when a node receives packets, ICWN can reduce the probability of becoming congested. Moreover, due to ICWN’s network dynamics, we determine the congestion risk threshold by jointly taking into account the average packet size, average forwarding risk, and available buffer resources. Further, we also evaluate the service ability of a node in a distributed manner by integrating the recommendation information from other intermediate nodes. Additionally, a node is selected as a relay node according to both the congestion risk and service ability. Simulation results show that the network performance can be greatly optimized by reducing the overhead of packet forwarding.

A COMPARISON OF ASYNCHRONOUS TRANSFER MODE (ATM) AND HIGH SPEED ETHERNET: THE NETWORK DESIGN IMPLICATIONS TO A BUSINESS ORGANIZATION

2003 ◽  
Vol 02 (04) ◽  
pp. 683-692 ◽  
Author(s):  
DENNIS GUSTER ◽  
CHANGSOO SOHN ◽  
PAUL SAFONOV ◽  
DAVID ROBINSON
Keyword(s):  
High Speed ◽  
High Performance ◽  
Network Performance ◽  
Asynchronous Transfer Mode ◽  
Business Environment ◽  
Business Organizations ◽  
Business Network ◽  
Transfer Mode ◽  
Technological Advances ◽  
Typical Performance

Technological advances such as high speed Ethernet and ATM have provided a means for business organizations to employ high performance networking. However, few studies have been conducted to verify the architecture's typical performance in a business environment. This study analyzed the network performance of high speed Ethernet and ATM when they were configured as LAN backbones. The results revealed that ATM exhibited performance superior to high speed Ethernet, but when adjustments were made for differences in line speed, the throughput was similar. In addition to analyzing empirical data about each technologies' performance, the advantages and limitations of using ATM in a business network are discussed.

scholarly journals A novel method of mobility-based clustering protocol in software defined sensor network

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Buwen Cao ◽  
Shuguang Deng ◽  
Hua Qin ◽  
Yue Tan
Keyword(s):  
Sensor Network ◽  
High Speed ◽  
Network Performance ◽  
Transmission Rate ◽  
Cluster Head ◽  
Average Power ◽  
Management Control ◽  
Mobile Nodes ◽  
Control Overhead ◽  
Average Power Consumption

AbstractThe distributed clustering method is widely used to extend network lifetime in traditional wireless sensor networks. However, it is difficult to achieve the idea performance of the whole network, such as transmission rate, energy consumption, and control overhead, neglecting the global stability of the network. To tackle this problem, a centralized mobility-based clustering (CMBC) protocol is proposed in the software defined sensor network. The method of CMBC mainly consists of two aspects: first, CMBC clusters the nodes with the connection time between the mobile nodes (i.e., noncluster head nodes, non-CH) and the cluster head (CH) and establishes stable topological structures between the non-CHs and the CH; second, when emergencies occur, the centralization management control center sends the configuration files to replace the CH. Compared to the distributed network of MBC, WCRA and IMP-MECA protocol, the proposed method can be applied in scenarios with high-speed mobile nodes to improve the network performance in terms of transmission successful rate, average power consumption, and average control overhead.

scholarly journals Boosting higher secret key rate in quantum key distribution over mature telecom components

2021 ◽  
Author(s):  
Tao Wang ◽  
Peng Huang ◽  
Lang Li ◽  
Yingming Zhou ◽  
Guihua Zeng
Keyword(s):  
Distribution System ◽  
Quantum Key Distribution ◽  
Secure Communication ◽  
High Speed ◽  
Performance Indicator ◽  
Transmission Rate ◽  
Key Distribution ◽  
Low Noise ◽  
High Rate ◽  
Secret Key

Abstract Secret key rate is a core performance indicator in implementing quantum key distribution, which directly determines the transmission rate of enciphered data. Here we demonstrate a high-key-rate quantum key distribution system over mature telecom components. The entire framework of quantum key distribution over these components is constructed. The high-rate low-noise Gaussian modulation of coherent states is realized by a classical electro-optic IQ modulator. High-baud low-intensity quantum signals are received by a commercial integrated coherent receiver under the shot-noise limit. A series of digital signal processing algorithms are proposed to achieve accurate signal recovery and key distillation. The system has yield a secret key rate of 10.37 Mbps, 1.61 Mbps, 337.82 kbps, and 58.06 kbps under the standard telecom fiber of 20 km, 50 km, 70 km, and 100 km, respectively. Our results represent the achieved highest secret key generation rate for quantum key distribution using continuous variables at a standard telecom wavelength. Moreover, it breaks the isolation between quantum communication and classical optical communication in terms of components, and opens the way to a high-speed and cost-effective formation of metropolitan quantum secure communication networks.

scholarly journals Design Scheme of Communication Node Based on FlexRay Bus

2018 ◽  
Vol 214 ◽  
pp. 01001
Author(s):  
Xin He ◽  
Jia’nan Wu ◽  
Hongde Deng ◽  
Zean Zhen ◽  
Chenyang Liu
Keyword(s):  
Flight Control ◽  
Data Transmission ◽  
High Speed ◽  
High Performance ◽  
Transmission Rate ◽  
Serial Communication ◽  
Flight Control System ◽  
Network Systems ◽  
Security Systems ◽  
Aerospace Applications

As a high-speed and reliable serial communication bus, the FlexRay bus has gradually become the mainstream of vehicle network systems. In order to verify the feasibility of the bus technology in aerospace applications, this paper designs a FlexRay communication node based on TI's high-performance microcontroller TMS570LS3137 for security systems. In the whole system, with the DSP of core, the FlexRay communication protocol is achieved by using the bus controller TJA1080 to carry out data transmission. This method is suitable for data transmission of pint and medium-sized UAV (unmanned air vehicles) flight control system with high integration and high transmission rate.

scholarly journals The High Performance of a Task Scheduling Algorithm Using Reference Queues for Cloud- Computing Data Centers

Electronics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 371 ◽  
Author(s):  
Chin-Ling Chen ◽  
Mao-Lun Chiang ◽  
Chuan-Bi Lin
Keyword(s):  
Cloud Computing ◽  
High Speed ◽  
High Performance ◽  
Scheduling Algorithm ◽  
Cloud Service ◽  
High Rate ◽  
Computing Environment ◽  
Service Architecture ◽  
Cloud Computing Environment ◽  
Task Scheduling Algorithm

As the network technology continues to grow at a high rate of speed, the traditional network topology is improved with novel distributed topologies such as the Cloud computing network. A cloud computing environment consists of a huge number of processors and memories, high-speed networks, and various application services to provide a lot of services over the Internet for users. However, many services need to search for suitable service nodes, and the workload of each node can be unbalanced. Based on the reason above, the Reference Queue based Cloud Service Architecture (RQCSA) and Fitness Service Queue Selection Mechanism (FSQSM) are proposed to handle more tasks, lower the makespan and queue waiting time, and improve efficiency. Moreover, the tasks can be distributed more evenly to avoid overloading cluster managers and lower the efficiency of the system.

Vacuum System to Minimize the Specimen Contamination of High-Performance EM

1977 ◽  
Vol 35 ◽  
pp. 68-69
Author(s):  
N. Yoshimura ◽  
K. Shirota ◽  
T. Etoh
Keyword(s):  
Electron Microscope ◽  
High Speed ◽  
High Performance ◽  
High Vacuum ◽  
Vacuum System ◽  
Pump System ◽  
Pumping System ◽  
Diffusion Pump ◽  
Almost All ◽  
Cascade Type

One of the most important requirements for a high-performance EM, especially an analytical EM using a fine beam probe, is to prevent specimen contamination by providing a clean high vacuum in the vicinity of the specimen. However, in almost all commercial EMs, the pressure in the vicinity of the specimen under observation is usually more than ten times higher than the pressure measured at the punping line. The EM column inevitably requires the use of greased Viton O-rings for fine movement, and specimens and films need to be exchanged frequently and several attachments may also be exchanged. For these reasons, a high speed pumping system, as well as a clean vacuum system, is now required. A newly developed electron microscope, the JEM-100CX features clean high vacuum in the vicinity of the specimen, realized by the use of a CASCADE type diffusion pump system which has been essentially improved over its predeces- sorD employed on the JEM-100C.

PHAX-SCAN: Functional integration of a Scanning Electron Microscope and an energy-dispersive x-ray analyser

1989 ◽  
Vol 47 ◽  
pp. 56-57
Author(s):  
Marc H. Peeters ◽  
Max T. Otten
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
High Speed ◽  
High Performance ◽  
Functional Integration ◽  
Energy Dispersive ◽  
X Rays ◽  
X Ray ◽  
High Speed Analysis ◽  
Scanning Electron

Over the past decades, the combination of energy-dispersive analysis of X-rays and scanning electron microscopy has proved to be a powerful tool for fast and reliable elemental characterization of a large variety of specimens. The technique has evolved rapidly from a purely qualitative characterization method to a reliable quantitative way of analysis. In the last 5 years, an increasing need for automation is observed, whereby energy-dispersive analysers control the beam and stage movement of the scanning electron microscope in order to collect digital X-ray images and perform unattended point analysis over multiple locations.The Philips High-speed Analysis of X-rays system (PHAX-Scan) makes use of the high performance dual-processor structure of the EDAX PV9900 analyser and the databus structure of the Philips series 500 scanning electron microscope to provide a highly automated, user-friendly and extremely fast microanalysis system. The software that runs on the hardware described above was specifically designed to provide the ultimate attainable speed on the system.

The bright future of digital imaging in scanning electron microscopy

1993 ◽  
Vol 51 ◽  
pp. 768-769
Author(s):  
M. T. Postek ◽  
A. E. Vladar
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Digital Imaging ◽  
High Speed ◽  
High Performance ◽  
Mass Storage ◽  
Analog To Digital ◽  
Central Processing ◽  
Digital Imaging Technology ◽  
Scanning Electron

One of the major advancements applied to scanning electron microscopy (SEM) during the past 10 years has been the development and application of digital imaging technology. Advancements in technology, notably the availability of less expensive, high-density memory chips and the development of high speed analog-to-digital converters, mass storage and high performance central processing units have fostered this revolution. Today, most modern SEM instruments have digital electronics as a standard feature. These instruments, generally have 8 bit or 256 gray levels with, at least, 512 × 512 pixel density operating at TV rate. In addition, current slow-scan commercial frame-grabber cards, directly applicable to the SEM, can have upwards of 12-14 bit lateral resolution permitting image acquisition at 4096 × 4096 resolution or greater. The two major categories of SEM systems to which digital technology have been applied are:In the analog SEM system the scan generator is normally operated in an analog manner and the image is displayed in an analog or "slow scan" mode.

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