scholarly journals Formation of service information in telemetry systems with data compression

2021 ◽  
Vol 82 (4) ◽  
pp. 61-71
Author(s):  
B. S. Yesmagambetov ◽  
Keyword(s):  
Data Compression ◽  
Data Packet ◽  
Time Interval ◽  
Interference Immunity ◽  
Constant Length ◽  
Channel Output ◽  
Service Information ◽  
Code Combination ◽  
Data Output ◽  
Length Code

In telemetry systems, using irreversible data compression, several message generation methods can be used. In the channel output packet, there may be several code words defining its composition. They can be combined and arranged in a strictly defined sequence. Such a data packet is a constant or variable length code combination, wherein the constant length of the packet is generated in the case of a predetermined and unchanged amount of information at the data output interval, and the variable is otherwise generated. The channel data packet can then be treated as a single whole: provide it with address information about the source of the message, information about the time interval at which the packet was formed, to bind significant samples to time, additional check symbols and codes to increase interference immunity of transmission, or to form a packet structure in the same way. Address, time and synchronization information in the literature is called overhead. The need to transmit overhead information reduces the efficiency of the transceiver systems. Therefore, the problem of reducing the volume of service information is extremely urgent.

Test data compression using alternating variable run-length code

Integration ◽  
2011 ◽  
Vol 44 (2) ◽  
pp. 103-110 ◽  
Author(s):  
Bo Ye ◽  
Qian Zhao ◽  
Duo Zhou ◽  
Xiaohua Wang ◽  
Min Luo
Keyword(s):  
Data Compression ◽  
Test Data ◽  
Test Data Compression ◽  
Run Length ◽  
Length Code

Test data compression using extended frequency-directed run length code based on compatibility

2010 ◽  
Vol 46 (6) ◽  
pp. 404 ◽  
Author(s):  
M.Y. Wan ◽  
Y. Ding ◽  
Y. Pan ◽  
S. Zhou ◽  
X.L. Yan
Keyword(s):  
Data Compression ◽  
Test Data ◽  
Test Data Compression ◽  
Run Length ◽  
Extended Frequency ◽  
Length Code

Optimisation of variable-length code for data compression of memoryless Laplacian source

2011 ◽  
Vol 5 (7) ◽  
pp. 906-913 ◽  
Author(s):  
M.D. Petković ◽  
A.V. Mosić ◽  
Z.H. Perić
Keyword(s):  
Data Compression ◽  
Variable Length ◽  
Variable Length Code ◽  
Length Code

Wavelet Transform Data Compression with an Error Level Guarantee for Z-Map Models

2016 ◽  
Vol 10 (2) ◽  
pp. 201-208 ◽  
Author(s):  
Nobuyuki Umezu ◽  
◽  
Kazuki Asai ◽  
Masatomo Inui ◽  
◽  
...  
Keyword(s):  
Wavelet Transform ◽  
Data Compression ◽  
Computational Cost ◽  
Maximum Error ◽  
Sample Shape ◽  
Data Output ◽  
Nc Milling ◽  
Cad Models ◽  
Frequency Components ◽  
Series Of Experiments

This paper proposes an algorithm to compress CAD models in a grid-based Z-map representation while keeping the compression artifacts within a specified value (the maximum difference allowed by the user). A wavelet transform is used for decomposing the input shape into lower and higher frequency patterns. A significant reduction in the data size can be achieved by deleting higher frequency components. We employ a tree structure called the error range (ER) tree to manage error occurrences and determine where to prune branches without increasing the resulting errors in the data compression. The widely used reversible compression method, gzip, is then used to obtain the final compressed model data output. We conducted a series of experiments with 12 sample shape models on a 512 × 512 grid. With a maximum error of 10 μm (a typical value specified for NC milling), the proposed method reduces the data by 90.9% on average and the computational cost of 19 ms is extremely low. The proposed method can be extended to larger CAD models in real applications.

The Use of Numerical Modeling to Optimize a New Wave Energy Converter Technology

2013 ◽  
Vol 47 (4) ◽  
pp. 151-163
Author(s):  
Brandon E. Green ◽  
Daniel G. MacDonald
Keyword(s):  
Numerical Model ◽  
Wave Energy ◽  
Power Output ◽  
Equations Of Motion ◽  
Wave Energy Converter ◽  
Time Interval ◽  
Energy Converter ◽  
Point Absorber ◽  
Data Output ◽  
Optimization Routine

AbstractA numerical model of a new point-absorber wave energy converter (WEC) technology was designed for simulation purposes using Python. The governing equations were defined to take into account the relevant forces on the buoy in an ideal wave environment as well as any opposing forces due to damping, the power take-off (PTO) mechanism, and alternator. These equations of motion were solved using a high-order iterative process to study the linear kinematics of the buoy, the behavior of the PTO, and the associated power output in an ideal ocean wave environment. The model allows for the adjustment of relevant parameters to explore the behavior of the WEC and optimize system efficiency depending on the wave conditions. The numerical model was designed to run single simulations for a specified time interval; however, an optimization routine was implemented to optimize the mechanical parameters that greatly affect power output. The optimization portion of the model was implemented to study the response of the virtual WEC to a variety of input conditions pertaining to the buoy, PTO, and wave dynamics. This paper explains the development of the prototype WEC and the associated numerical model, in addition to evaluating the response of the WEC to a variety of input conditions. The output of the numerical model is discussed for the associated wave field used for simulation purposes. The design and implementation of the numerical model provides insight into changes in design components to maximize system power output and efficiency. The results of the numerical model and examples of data output for specific input conditions are investigated.

Introductory Remarks

1980 ◽  
Vol 38 ◽  
pp. 598-599
Author(s):  
H. Mohri
Keyword(s):  
Muscle Contraction ◽  
Experimental Evidence ◽  
Sea Urchin ◽  
Constant Length ◽  
Thin Filaments ◽  
Bridge Formation ◽  
Thick Filaments ◽  
Sliding Mechanism ◽  
Radial Spokes ◽  
Cilia And Flagella

In 1959, Afzelius observed the presence of two rows of arms projecting from each outer doublet microtubule of the so-called 9 + 2 pattern of cilia and flagella, and suggested a possibility that the outer doublet microtubules slide with respect to each other with the aid of these arms during ciliary and flagellar movement. The identification of the arms as an ATPase, dynein, by Gibbons (1963)strengthened this hypothesis, since the ATPase-bearing heads of myosin molecules projecting from the thick filaments pull the thin filaments by cross-bridge formation during muscle contraction. The first experimental evidence for the sliding mechanism in cilia and flagella was obtained by examining the tip patterns of molluscan gill cilia by Satir (1965) who observed constant length of the microtubules during ciliary bending. Further evidence for the sliding-tubule mechanism was given by Summers and Gibbons (1971), using trypsin-treated axonemal fragments of sea urchin spermatozoa. Upon the addition of ATP, the outer doublets telescoped out from these fragments and the total length reached up to seven or more times that of the original fragment. Thus, the arms on a certain doublet microtubule can walk along the adjacent doublet when the doublet microtubules are disconnected by digestion of the interdoublet links which connect them with each other, or the radial spokes which connect them with the central pair-central sheath complex as illustrated in Fig. 1. On the basis of these pioneer works, the sliding-tubule mechanism has been established as one of the basic mechanisms for ciliary and flagellar movement.

Sign in / Sign up

Export Citation Format

Share Document