TCP Proxy with Data Redundancy Elimination and Compressing Technology

2014 ◽  
Vol 687-691 ◽  
pp. 2979-2983
Author(s):  
Li Li Yu ◽  
Hong Yuan Chen
Keyword(s):  
Transmission Efficiency ◽  
Congestion Avoidance ◽  
Transmission Protocol ◽  
Flow Optimization ◽  
Large Delay ◽  
Redundancy Elimination ◽  
Data Redundancy ◽  
Slow Start ◽  
Tcp Protocol ◽  
Low Efficiency

TCP protocol is a connection-oriented transmission protocol with mechanisims such as sliding window,data acknowledgement,slow start and congestion avoidance to ensure reliability[1].But these machanisims bring low efficiency because of delay and loss.Thus,we need to design an improved TCP protocol to achieve the purpose of WAN acceleration.This paper mainly introduces two kinds of WAN accelebration technology of TCP flow optimization and data cache technology.TCP flow optimization uses TCP transparent proxy technology based on an improved TCP protocol to solve the problem of large delay and high packet loss rate.The improved TCP protocol includes slow start improved,large receive buff, the improvement algorithm of congestion avoidance,etc.Besides,data redundancy elimination and compression technology[2] are also used in TCP data interation to reduce link load and improve transmission efficiency.

Vegas-f: Adaptive Growth Rate of Slow Start for TCP Vegas in Large Bandwidth-Delay Network

2014 ◽  
Vol 1049-1050 ◽  
pp. 1771-1775
Author(s):  
Pei Dong Hou ◽  
Bi Hua Tang ◽  
Fang Liu ◽  
Yuan An Liu ◽  
Kai Ming Liu ◽  
...  
Keyword(s):  
Growth Rate ◽  
Linear Growth ◽  
Transmission Efficiency ◽  
Congestion Avoidance ◽  
Large Delay ◽  
Slow Start ◽  
Large Bandwidth ◽  
Dynamic Growth ◽  
Simulation Results ◽  
Tcp Vegas

TCP Vegas has the problem that it stops slow start too early, and it is more obvious in the large delay-bandwidth network. This phenomenon can cause a very long linear growth after entering congestion avoidance phase, and it will reduce the transmission efficiency. This paper analyzes that the reasons for this phenomenon is due to the exponential growth of slow start itself, then puts forward a dynamic growth algorithms of slow start, we call it Vegas-f. Improved algorithms can dynamically adjust the growth rate of slow start, so as to improve the transmission efficiency and competitiveness in mixing network. Simulation results show that the improved algorithm has completely solved the problem and the performance is improved significantly.

Analysis on Transmission Characteristics of New Axis-Fixed Cycloid Gear

2010 ◽  
Vol 97-101 ◽  
pp. 60-63 ◽  
Author(s):  
Cai Chao Zhu ◽  
Ming Yong Liu ◽  
Xue Song Du ◽  
Ning Xiao ◽  
Bin Zhang
Keyword(s):  
Bearing Capacity ◽  
Simple Structure ◽  
Basic Structure ◽  
Transmission Efficiency ◽  
Torsional Stiffness ◽  
Experimental Result ◽  
Test Bed ◽  
Transmission Characteristics ◽  
High Transmission ◽  
Low Efficiency

Due to those disadvantages of the cycloidal-pin wheel transmission, such as low efficiency, low bearing capacity and poor rigidity, a new kind of axis-fixed cycloid transmission is proposed after generalizing those advantages of axis-fixed drive, cycloid drive and oscillating-tooth drive. Special output mechanism is unnecessary here because the motion is exported directly by the cycloid gear. Thus, there are many advantages of this new transmission-simple structure, small size, high transmission efficiency and large torsional stiffness. The transmission theory and basic structure are analyzed and the formula for the transmission efficiency is derived. A prototype is manufactured and the efficiency experiment is carried out on the test bed. The experimental result verifies the correctness of the therotical analysis.

scholarly journals An Incremental Acquisition Method for Web Forensics

2021 ◽  
Vol 13 (6) ◽  
pp. 1-13
Author(s):  
Guangxuan Chen ◽  
Guangxiao Chen ◽  
Lei Zhang ◽  
Qiang Liu
Keyword(s):  
Real Time ◽  
Digital Forensics ◽  
Recall Rate ◽  
Web Pages ◽  
Web Page ◽  
Content Extraction ◽  
Data Redundancy ◽  
Repeated Acquisition ◽  
Low Efficiency ◽  
Acquisition Method

In order to solve the problems of repeated acquisition, data redundancy and low efficiency in the process of website forensics, this paper proposes an incremental acquisition method orientecd to dynamic websites. This method realized the incremental collection on dynamically updated websites through acquiring and parsing web pages, URL deduplication, web page denoising, web page content extraction and hashing. Experiments show that the algorithm has relative high acquisition precision and recall rate, and can be combined with other data to perform effective digital forensics on dynamically updated real-time websites.

scholarly journals An Improved Algorithm to Enhance the Performance of FAST TCP Congestion Control for Personalized Healthcare Systems

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Jiyang Ye ◽  
Bowen Huang ◽  
Xiaolong Chen
Keyword(s):  
Control Law ◽  
Network System ◽  
Improved Method ◽  
Medical Systems ◽  
Queuing Delay ◽  
Slow Start ◽  
Fast Tcp ◽  
Tcp Protocol ◽  
Tcp Network ◽  
The Stability

The development of personalized medical systems should be supported by a fast and stable network system. The FAST TCP network system is the appropriate support system for this purpose. However, when the FAST TCP is deployed, the static mapping selection method for protocol parameters is unable to guarantee the small queuing delay and fast convergence of the network simultaneously. By conducting theoretical analysis and simulation experiments, the relationships among FAST TCP protocol slow start condition, control law gain parameters, and FAST TCP system convergence rate were examined. To ensure the stability of the FAST TCP system and to select the smallest protocol parameters, an improved method to effectively accelerate the convergence velocity of the FAST TCP system is proposed in this study. In this method, the number of packets for staying in the buffer for FAST TCP connections was taken as the criterion of the slow start, and the gain parameter of the control law was dynamically adjusted according to the local information of each FAST TCP connection. Using this improved method, the FAST TCP system can achieve a stable and small queuing delay, whilst the FAST TCP system could converge quickly to the equilibrium point simultaneously.

scholarly journals Kinematical characteristic of mechanical frictional variable speed drive

2012 ◽  
Vol 52 (No. 2) ◽  
pp. 61-68
Author(s):  
D. Herák ◽  
V. Šleger ◽  
R. Chotěborský ◽  
K. Houška ◽  
E. Janča
Keyword(s):  
Power Transmission ◽  
Transmission Efficiency ◽  
Variable Speed ◽  
Variable Speed Drives ◽  
The Real ◽  
Theoretical Design ◽  
Conversion Unit ◽  
Real Characteristic ◽  
Low Efficiency ◽  
Ring Position

The paper describes a new system of mechanical spherical conical friction drive. In the present a row of simple friction, belt, chain, wave and differential variable speed drives is published. For the required range of speed variation they are altogether unfit. The currently used power transmissions are of low efficiency (60–70%). Therefore the better power transmission efficiency is required. The possibility of multicontact power transmission appears as the most suitable principle of the power transmission. Using the designed function model, which was made according to the small tractor producers requirements, the real output kinematical characteristic was measured. It is derived the complete drive conversion unit kinematics and the theoretical kinematical characteristic design. The theoretical design is compared with the real characteristic determined by measuring using the test station. From the measured values we determined that the geometrical characteristic, i.e. the relation between output speed and ring position, corresponds in the ring position range (2.8÷14) mm to the theoretical premise.

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