Efficient algorithm for calculating short cycles in Tanner graph based on matrix computation by Qing ZHU, Le-nan WU, Yong-biao YANG, Jie LI, Shi-ming XU

“…Loop distribution of Tanner graph affects the BER performance of low-density parity-check codes(LDPC) decoding.To count short cycles in the Tanner graph efficiently,a side by side recursion algorithm based on matrix computation was proposed.Firstly,5 basic graph structures were defined to realize recursive calculate in the implementation process.Compared with previous works,the algorithm provided many methods for counting the same length of cycles.The same result confirmed the correctness of the algorithm.The new algorithm could not only calculate the total number of cycles,but also gave the number each edge participating in fixed-length cycles.Its complexity was proportional to the product of D and square of N,where D was the average degree of variable nodes,and N denoted the code length.For LDPC codes,D was far less than N.For most of the LDPC codes,the calculation for numbers of cycle-length g、g+2、g+4 was only several seconds.…”
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Efficient algorithm for calculating short cycles in Tanner graph based on matrix computation by Qing ZHU, Le-nan WU, Yong-biao YANG, Jie LI, Shi-ming XU

“…Loop distribution of Tanner graph affects the BER performance of low-density parity-check codes(LDPC) decoding.To count short cycles in the Tanner graph efficiently,a side by side recursion algorithm based on matrix computation was proposed.Firstly,5 basic graph structures were defined to realize recursive calculate in the implementation process.Compared with previous works,the algorithm provided many methods for counting the same length of cycles.The same result confirmed the correctness of the algorithm.The new algorithm could not only calculate the total number of cycles,but also gave the number each edge participating in fixed-length cycles.Its complexity was proportional to the product of D and square of N,where D was the average degree of variable nodes,and N denoted the code length.For LDPC codes,D was far less than N.For most of the LDPC codes,the calculation for numbers of cycle-length g、g+2、g+4 was only several seconds.…”
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Methods of Increasing Efficiency of Antennas Embedded in Dissipative Media by R. Yu. Borodulin

“…The results are confirmed with numerical calculations. The article presents the methods of increasing efficiency of antennas embedded in soil with different electrical parameters. …”
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Length of Polarization-Correlation Based on Speckle Pattern for Optical Coherent Detection by Longkun Zhang, Jianfeng Sun, Qian Xu, Weibiao Chen

“…It is experimentally demonstrated that the LPC is exploited to not only investigate the nature of the polarization changes between different speckle sizes, but also be combined with coherent efficiency. This study can provide new insights of speckle depolarization in optical coherent detection and open new opportunities for improving coherent efficiency.…”
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Direct analytical efficiency assessment of the NaI(Tl) gamma-ray detector (Romashka) by Thabet Abouzeid A., Badawi Mohamed S., Hamzawy Ayman, Ruskov Ivan N., Badawi Mohamed I., Sirakov Ivan A., Kopatch Yuri N., Grozdanov Dimitar N., Salem Bohaysa A.

“…The present study focuses on the analytical and numerical calculations of the solid angle, effective solid angle, efficiency, and gamma-ray average path length within the detector materials as a function of the source position. …”
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INFLUENCE VALUATION OF ASYNCHRONOUS MOTOR CONSTRUCTIVE MODIFICATIONS WITHOUT TOOTH AREA CORRECTION ON ITS ENERGY EFFICIENCY by Irina Romanenko, Maksim Danilov

“…The working characteristics of asynchronous motor with squirrel-cage rotor were calculated based on verifying computation. The rated efficiency and power factor were obtained from these results. …”
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Synthesis of non-ionic surfactants based on alkylene diamine and evaluation of their corrosion inhibition efficiency on carbon steel in formation water by A.M. Al-Sabagh, N.M. Nasser, E.A. Khamis, Tahany Mahmoud

“…These derivatives were characterized by FT-IR, and the surface tension and thermodynamic parameters were calculated. The polarization showed that the inhibition efficiency of the prepared compounds was increased with increasing the length of the internal alkyl chain between the two terminal amino groups of diamine. …”
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A Simplified Calculation Method of Length Adjustment of Datum Strand for the Main Cable with Small Sag by Jun He, Chuanxi Li, Hongjun Ke, Yang Liu, Yuping Zhang, Chuangwen Dong, Hongli Li, Zhe Zhang

“…Then, the applicability of the proposed cable length adjustment formula under different conditions of the sag-span ratio is analyzed and compared with other calculation methods based on the theory of catenary or parabola. …”
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Novel cationic surfactants from fatty acids and their corrosion inhibition efficiency for carbon steel pipelines in 1 M HCl by A.M. Al-Sabagh, N.Gh. Kandil, O. Ramadan, N.M. Amer, R. Mansour, E.A. Khamis

“…The inhibition efficiencies obtained from the two employed methods are nearly closed. …”
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ANALYTICAL MODEL OF NOISE STABILITY CALCULATION OF SYSTEMS WITH MULTIPOSITIONAL MODULATION AND CODING BY REED-SOLOMON ALGORITHM by E. B. Lipkovich, V. A. Kovshik, A. A. Serchenya

“…They make it possible to directly determine the theoretically required values of signalto-noise ratios (SNR) for input devices from given probabilistic errors based on RS signals, as well as to study the energy gain from coding (EGC), accessible and frequency-efficient systems. Based on the proposed rations, the calculations of the main characteristics of the communication channels for various parameters of the RS codes, the reliability of reception, types and orders of modulation are performed. …”
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THE COMPARATIVE ECONOMIC-MATHEMATICAL ANALYSIS OF EFFICIENCY OF APPLICATION ON THE ACW OF THE ULTRALIGHT X-32 "BEKAS" PLANE AND THE MOTOR HANG-GLIDER MD-50S by I. V. Nikitin, I. V. Khainatsky

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Energy Conversion Efficiency of the Bulk Photovoltaic Effect by Andreas Pusch, Udo Römer, Dimitrie Culcer, Nicholas J. Ekins-Daukes

“…Finally, we calculate the energy conversion efficiency for an example two-dimensional (2D) material that has been suggested as a candidate material for high-efficiency BPVE-based solar cells and show that the efficiency is very similar to the efficiency of known 3D materials.…”
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Iol optic power calculation in patients with eye axial length 24‑28 mm without preceding refractive surgery by K. B. Pershin, N. F. Pashinova, A. Iu. Tsygankov, S. L. Legkih

“…Analysis of effectiveness of IOL calculating formulas and frequency of intra- and postoperative complications of phacoemulsification in patients with eye axial length 24.0‑28.0 mm.Patients and methods. …”
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Nutrient dynamics in restored and unrestored urban streams in the Piedmont ecoregion of South Carolina by Emily N. Jordan, Debabrata Sahoo, Calvin B. Sawyer, Jeremy W. Pike, Dara M. Park, Sarah A. White, Brian E. Haggard

“…The mean soluble reactive phosphorus uptake length throughout the study was shorter in RES than URE, suggesting that the restored reach was more efficient in retaining dissolved phosphorus. …”
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Effectiveness of arrangement of the long cargo transportation on the fi tting platforms with different length of freight storage by S. V. Mozgrin, G. E. Pisarevskiy

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Clogging of induced fracture to increase waterflood sweep efficiency by K. M. Fedorov, I. V. Vydysh, A. V. Kobyashev, N. V. Mikhailov, A. S. Gavris

“…The example of a reverse five–point waterflood pattern was investigated. In the basic calculation run, fracture length was constant during all process. …”
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The Separation Characteristics of a High Efficiency Cyclone Separator by MENG Kehan, LU Yiping, DAI Jinglu, ZHANG Songsong

“…In order to satisfy the requirements of separation performance, the parameters such as the length and diameter of exhaust pipe were changed successively and the geometric standard deviation of the efficiency curve of separation was calculated and compared on the basis of the initial structure scheme. …”
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Energy Efficient Metadata Management for Cloud Storage System by Young Woong Ko, Sun-Jeong Kim, Jin Kim, Eui-Jik Kim, Jung Min So

“…In this paper, we propose an energy efficient file synchronization scheme that provides hybrid data chunking using variable-length chunking (VLC) and fixed-length chunking (FLC). …”
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Power Transfer Efficiency in The Inductive RF Ion Source by V. Voznyi

“…The transformer model of an RF inductive discharge was applied to calculate the power transfer efficiency to plasma of the ion source. …”
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Calculation Methodology and Results of Optimization of Design Parameters of the Tractor Recuperative Mounted System When Aggregated with Forest Tillage Implements by Valeryi I. Posmetyev, Maksim A. Savinkov, Viktor V. Posmetyev, Andrey Yu. Manukovskii, Vadim O. Nikonov

“…The aim of the study has been to obtain analytical expressions for changes in the studied design parameters of the tractor recuperative mounted system, ensuring optimal values of its efficiency. A methodology for calculating the efficiency indicators and two-factor optimization of the design parameters of the tractor recuperative mounted system is presented. …”
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