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Journal articles on the topic 'Capacity Spectrum'

Author: Grafiati

Published: 2 June 2025

Last updated: 7 July 2025

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1

Lee, Jemin, Jeffrey G. Andrews, and Daesik Hong. "Spectrum-Sharing Transmission Capacity." IEEE Transactions on Wireless Communications 10, no. 9 (2011): 3053–63. http://dx.doi.org/10.1109/twc.2011.070511.101941.

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2

Kasper, Judith D., Kitty S. Chan, and Vicki A. Freedman. "Measuring Physical Capacity." Journal of Aging and Health 29, no. 2 (2016): 289–309. http://dx.doi.org/10.1177/0898264316635566.

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Objective: The objective of this study was to develop and assess a composite measure of physical capacity using self-report and physical performance items. Method: Item response theory (IRT) is used to evaluate measurement properties of self-report and performance items and to develop a composite measure for 7,609 participants in the National Health and Aging Trends Study. Results: Self-reports distinguish differences at the lower end of physical capacity but not at mid-to-high levels. Performance-based measures discriminate across a fuller spectrum. An IRT-based composite score, drawing on both, provides increased measurement precision across the physical capacity spectrum and detects age group differences if either self-report or performance does so—suggesting it is better suited for studying age-related changes than either measure alone. Discussion: Self-report and performance measures have different strengths on the physical capacity spectrum. IRT provides a means of combining these different measurement approaches for analyses of physical capacity across a broad range of functioning in later life.

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Cho, Sung Gook, Woong Ki Park, and Yang Hee Joe. "Effects of Inelastic Demand Spectrum on Seismic Capacity Evaluation of Curved Bridge by Capacity Spectrum Method." Journal of the Korea institute for structural maintenance and inspection 15, no. 3 (2011): 195–206. http://dx.doi.org/10.11112/jksmi.2011.15.3.195.

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4

Lee, Jemin, Jeffrey G. Andrews, and Daesik Hong. "Spectrum-Sharing Transmission Capacity with Interference Cancellation." IEEE Transactions on Communications 61, no. 1 (2013): 76–86. http://dx.doi.org/10.1109/tcomm.2012.100512.110347.

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5

Hwang, Chia Lin, and San-qi Li. "Link capacity allocation by input power spectrum." Telecommunication Systems 4, no. 1 (1995): 353–63. http://dx.doi.org/10.1007/bf02110094.

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6

Yousefvand, Mohammad, Nirwan Ansari, and Siavash Khorsandi. "Maximizing Network Capacity of Cognitive Radio Networks by Capacity-Aware Spectrum Allocation." IEEE Transactions on Wireless Communications 14, no. 9 (2015): 5058–67. http://dx.doi.org/10.1109/twc.2015.2431691.

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7

Foukalas, Fotis, and George T. Karetsos. "Joint power control and spectrum sensing for capacity maximisation in spectrum sharing systems." International Journal of Electronics 100, no. 3 (2013): 302–11. http://dx.doi.org/10.1080/00207217.2012.710877.

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8

Yang, Yuli. "Effective Capacity of a Novel Spectrum-Band Selection Scheme in Spectrum-Sharing Networks." IEEE Transactions on Vehicular Technology 66, no. 3 (2017): 2838–43. http://dx.doi.org/10.1109/tvt.2016.2577540.

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9

Zhang, Jing, Duixian Gao, and Zhiwei Chen. "The Equivalent Damping Ration in Capacity Spectrum Method." Advanced Materials Research 163-167 (December 2010): 4290–94. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.4290.

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Study the calculation method of equivalent damping ratio in Capacity Spectrum Method. Analyzing the feature of several methods for the calculation of equivalent damping ratio in the world, from the numeral example, the numeral results of several calculation methods of equivalent damping ratio are compared to the results of time course method. The follow conclusions are reached: Secant stiffness method overestimate the value of equivalent damping ratio for steel structure, therefore, underestimate the supreme seismic reaction. The level of underestimate is interrelate to yield still coefficient; Under the medium earthquakes effect, all the method can fairly good forecast the supreme seismic reaction; But Under the large earthquakes effect, only the Kwan (EP) method can give the best result. The conclusions has impotent value for the perfect of Performance-Based Seismic Design Methods.

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10

Madfors, M., K. Wallstedt, S. Magnusson, H. Olofsson, P. O. Backman, and S. Engstrom. "High capacity with limited spectrum in cellular systems." IEEE Communications Magazine 35, no. 8 (1997): 38–45. http://dx.doi.org/10.1109/35.606027.

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11

Lin, Yu-Yuan, and Kuo-Chun Chang. "An improved capacity spectrum method for ATC-40." Earthquake Engineering & Structural Dynamics 32, no. 13 (2003): 2013–25. http://dx.doi.org/10.1002/eqe.312.

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12

Fajfar, Peter. "Capacity spectrum method based on inelastic demand spectra." Earthquake Engineering & Structural Dynamics 28, no. 9 (1999): 979–93. http://dx.doi.org/10.1002/(sici)1096-9845(199909)28:9<979::aid-eqe850>3.0.co;2-1.

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13

Kim, Taehan, Hyunmin Park, and Bokeun Kim. "Heuristic estimation of network capacity and spectrum requirement." Journal of Computer Virology and Hacking Techniques 10, no. 2 (2014): 97–100. http://dx.doi.org/10.1007/s11416-013-0198-z.

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14

LICHMAN, EUGENE. "INFORMATIONAL CAPACITY OF ACOUSTIC MEASUREMENTS." Journal of Computational Acoustics 09, no. 04 (2001): 1395–406. http://dx.doi.org/10.1142/s0218396x01001194.

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Presented is the theoretical model for extracting the system response from measurements of the acoustic wave propagating through the linear system. Based on the results of this analysis, measurements are described as a convolution of the impulse response of the system with the mixed-phase-lag nonstationary forward wavelet (or source-generated wavefield). The source-generated wavefield includes all multiple terms generated within the system as well as the energy source signature and the detector characteristics. It is shown that the decay ratio of the source-generated wavefield can be used to separate the energy spectrum of the source-generated wavefield and the energy spectrum of the impulse response from the measurement function. The level of separability of energy spectrum of the source-generated wavefield and the impulse response reflects the amount of information about the measured system, which can be obtained from experimental data. In particular, if the source-generated wavefield does not decay during the propagation through the system, or, if the effective distance of the decay is comparable with the size of the measured system, the impulse response cannot be extracted from the result of measurements. Based on the theoretical conclusions, the computational procedure is proposed for one-dimensional deconvolution algorithm. The application of this algorithm is illustrated using seismic data as an example. The forward wavelet is extracted from seismic data itself. The deconvolution of data with the extracted wavelet provides surface-consistent scaling along with peg-leg and short-period multiples attenuation.

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15

Zahin, Maryam, Farrukh Aqil, Fohad Mabood Husain, and Iqbal Ahmad. "Antioxidant Capacity and Antimutagenic Potential ofMurraya koenigii." BioMed Research International 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/263509.

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It is well known that the intake of antioxidants with increased consumption of fruits and vegetables and medicinal herbs contributes towards reduced risk of certain diseases including cancers. This study aims to evaluate the broad-spectrum antioxidant and antimutagenic activities as well as to elucidate phytochemical profile of an Indian medicinal plantMurraya koenigii(curry) leaves. Leaves of the plant were successively fractionated in various organic solvents. Benzene fraction demonstrated the highest phenolic content followed by petroleum ether. The benzene fraction showed maximum antioxidant activity in all tested assays, namely, phosphomolybdenum, 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical, ferric reducing antioxidant power (FRAP) and cupric reducing antioxidant capacity (CUPRAC) assays. Based on the promising broad-spectrum antioxidant activity, benzene fraction was further evaluated for antimutagenic activity and showed a dose-dependent antimutagenic response in AmesSalmonellamutagenicity assay. It inhibited 72–86% mutagenicity induced by sodium azide, methyl methanesulfonate, benzo(a)pyrene, and 2-aminoflourene at the maximum tested concentration (100 μg/mL) inSalmonella typhimuriumtester strains. At least 21 compounds were detected by GC/MS. The findings clearly demonstrated that phenolic-rich benzene fraction has promising broad-spectrum antioxidant and antimutagenic property and needs further evaluation to exploit its therapeutic potential.

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16

Wang, Jingjing, Na Li, Wei Shi, Yangyang Ma, Xiulong Liang, and Xinli Dong. "Capacity of 60 GHz Wireless Communications Based on QAM." Journal of Applied Mathematics 2014 (2014): 1–5. http://dx.doi.org/10.1155/2014/815617.

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With apparent advantages of the several GHz license-free spectrums, 10 W maximum transmit power, and so forth, 60 GHz wireless communication technology has become the first choice for Gbps level short-range wireless communications. This paper researches 60 GHz wireless communications over the additive white Gaussian noise channel. Channel capacity with quadrature amplitude modulation (QAM) is investigated for the unlicensed 59–64 GHz radio spectrum set aside by FCC. Moreover, the capacity with QAM is compared to that with phase shift keying (PSK). It is shown that QAM is capable of providing Gbps data rate and outperforms PSK especially when the modulation order is large. The results prove that QAM is an attractive scheme for 60 GHz wireless communications.

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17

Xie, Xianbin, and Xinshan Li. "Research of cognitive radio networks capacity on spectrum sensing." JOURNAL OF ELECTRONIC MEASUREMENT AND INSTRUMENT 24, no. 1 (2010): 61–65. http://dx.doi.org/10.3724/sp.j.1187.2010.00061.

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18

Bricout, Véronique-Aurélie, Marion Pace, Léa Dumortier, Flavie Baillieul, Anne Favre-Juvin, and Michel Guinot. "Reduced Cardiorespiratory Capacity in Children with Autism Spectrum Disorders." Journal of Clinical Medicine 7, no. 10 (2018): 361. http://dx.doi.org/10.3390/jcm7100361.

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Background—Children with autistic spectrum disorders (ASDs) are frequently hampered by motor impairment. It limits them from regularly practicing physical activities and results in a lower physical fitness even though low cardiorespiratory fitness is one of the most important predictors of all-cause mortality. This study aimed to investigate the cardiorespiratory fitness of boys with ASD compared to typically developed children. Methods—forty male children participated. Twenty were control children (CONT—10.0 ± 1.6 years) and 20 were ASD children (ASD—10.7 ± 1.2 years; intellectual quotient > 70). All participants completed an incremental exercise test on a treadmill. An evaluation of motor characteristics by three tests was conducted (muscular strength; explosive power; flexibility). Assessments of daily physical activity were obtained by questionnaires (PAQ-C) and by actigraphy. Results—in the ASD group, aerobic capacity values (VO2peak), effort duration and maximal speed were significantly lower compared to CONT (p < 0.05). Flexibility, explosive power and muscular strength were significantly lower in ASD compared to CONT (p < 0.05). Similarities between all children were observed for physical activity evaluation by actigraphy and with the PAQ-C. Conclusions—children with ASD had lower cardiorespiratory fitness than CONT despite similar physical activity levels. Our results suggested that the difference may be due to motor discrepancies.

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19

Gastpar, Michael. "On Capacity Under Receive and Spatial Spectrum-Sharing Constraints." IEEE Transactions on Information Theory 53, no. 2 (2007): 471–87. http://dx.doi.org/10.1109/tit.2006.889016.

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20

Blagojevic, Vesna, and Predrag Ivanis. "Ergodic Capacity for TAS/MRC Spectrum Sharing Cognitive Radio." IEEE Communications Letters 16, no. 3 (2012): 321–23. http://dx.doi.org/10.1109/lcomm.2012.011312.111488.

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21

Wu, Xuanli, Xingling Han, and Fabrice Labeau. "High capacity spectrum sensing framework based on relay cooperation." China Communications 13, no. 8 (2016): 117–26. http://dx.doi.org/10.1109/cc.2016.7563714.

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22

Abe, Jun-ichi, Katsuya Nakahira, Yoshinori Suzuki, and Takatoshi Sugiyama. "Direct Spectrum Division Transmission for High-capacity Satellite Communications." NTT Technical Review 10, no. 6 (2012): 15–20. http://dx.doi.org/10.53829/ntr201206fa3.

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23

Chopra, Anil K., and Rakesh K. Goel. "Capacity-Demand-Diagram Methods Based on Inelastic Design Spectrum." Earthquake Spectra 15, no. 4 (1999): 637–56. http://dx.doi.org/10.1193/1.1586065.

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An improved capacity-demand-diagram method that uses the well-known constant-ductility design spectrum for the demand diagram is developed and illustrated by examples. This method estimates the deformation of inelastic SDF systems consistent with the selected inelastic design spectrum, while retaining the attraction of graphical implementation of the ATC-40 Nonlinear Static Procedure. One version of the improved method is graphically similar to ATC-40 Procedure A whereas the second version is graphically similar to ATC-40 Procedure B. However, the improved procedures differ from ATC-40 procedures in one important sense. The demand diagram used is different: the constant-ductility demand diagram for inelastic systems in the improved procedure versus the elastic demand diagram in ATC-40 for equivalent linear systems. The improved method can be conveniently implemented numerically if its graphical features are not important to the user. Such a procedure, based on equations relating the yield strength reduction factor, Ry, and ductility factor, μ, for different period, Tn, ranges, has been presented, and illustrated by examples using three different Ry - μ - Tn relations.

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24

Hanly, S. V., and D. N. Tse. "Power control and capacity of spread spectrum wireless networks." Automatica 35, no. 12 (1999): 1987–2012. http://dx.doi.org/10.1016/s0005-1098(99)00133-8.

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25

Axell, Erik, Erik G. Larsson, and Danyo Danev. "Capacity considerations for uncoordinated communication in geographical spectrum holes." Physical Communication 2, no. 1-2 (2009): 3–9. http://dx.doi.org/10.1016/j.phycom.2009.03.002.

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26

Yang, Liang, Khalid Qaraqe, Erchin Serpedin, and Mohamed-Slim Alouini. "Capacity analysis of spectrum sharing spatial multiplexing MIMO systems." Physical Communication 13 (December 2014): 109–19. http://dx.doi.org/10.1016/j.phycom.2014.09.003.

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27

Xu, YuHua, JinLong Wang, and QiHui Wu. "Effective capacity region of two-user opportunistic spectrum access." Science China Information Sciences 54, no. 9 (2011): 1928–37. http://dx.doi.org/10.1007/s11432-011-4380-y.

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28

Zuiddam, Jeroen. "The Asymptotic Spectrum of Graphs and the Shannon Capacity." Combinatorica 39, no. 5 (2019): 1173–84. http://dx.doi.org/10.1007/s00493-019-3992-5.

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29

Gencturk, Bora, and Amr S. Elnashai. "Development and application of an advanced capacity spectrum method." Engineering Structures 30, no. 11 (2008): 3345–54. http://dx.doi.org/10.1016/j.engstruct.2008.05.008.

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30

Khoshkholgh, Mohammad G., Keivan Navaie, and Halim Yanikomeroglu. "Achievable Capacity in Hybrid DS-CDMA/OFDM Spectrum-Sharing." IEEE Transactions on Mobile Computing 9, no. 6 (2010): 765–77. http://dx.doi.org/10.1109/tmc.2010.15.

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31

Stotas, Stergios, and Arumugam Nallanathan. "Enhancing the Capacity of Spectrum Sharing Cognitive Radio Networks." IEEE Transactions on Vehicular Technology 60, no. 8 (2011): 3768–79. http://dx.doi.org/10.1109/tvt.2011.2165306.

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32

Xu, H. "Colour rendering capacity and luminous efficiency of a spectrum." Lighting Research and Technology 25, no. 3 (1993): 131–32. http://dx.doi.org/10.1177/096032719302500304.

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33

Mota, Kim Moraes, Wanessa de Alvarenga Silva, Luan Carlos de S. M. Ozelim, Leticia Moreira Vale, Ugo Silva Dias та Pushpa Narayan Rathie. "Spectrum sharing systems capacity under η-μ fading environments". Journal of the Franklin Institute 356, № 12 (2019): 6741–56. http://dx.doi.org/10.1016/j.jfranklin.2019.05.037.

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34

Yao, Chang Hua, Qi Hui Wu, and Xue Qiang Zheng. "Demand-Oriented Optimal Spectrum Sensing Order in Dynamic Spectrum Access." Applied Mechanics and Materials 543-547 (March 2014): 2262–65. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.2262.

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In this paper, we proposed a more practical spectrum sensing order problem in cognitive radio networks (CRN), considering the effect of different traffic of second user (SU). We discard the impractical assumption that SU has data packets to transmit all the time, and use the actually packets per second rather than the channel capacity as the definition of throughput, to reformulate the optimal sensing order problem. The new method to decide sensing order can improve the throughput performance in practical system.

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35

Skladova, L., R. Murnieks, I. Kurbatska, A. Ostrovskis, V. Bobrovs, and S. Spolitis. "Extending Transceiver Capacity with a Scalable Spectrum Slicing Technique for Optical Access Networks." Latvian Journal of Physics and Technical Sciences 61, no. 3 (2024): 43–52. http://dx.doi.org/10.2478/lpts-2024-0019.

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Abstract The paper demonstrates a spectrum slicing technique applied to PAM-4 modulated signal spectrum at 40 Gbaud baudrate for optical access networks. The spectrum slicing is shown in VPIphotonics simulation environment, where characteristics of key components are measured in the laboratory and loaded into the corresponding elements of the simulation setup. The spectrum of electrical baseband signal is sliced in four slices introducing an additional degree of freedom – higher data rate signals can be transmitted by re-using already-existing lower bandwidth transceiver components in an optical access network. This tackles the electronic bottleneck enabling the on-demand variable bandwidth allocation and extends the life span of opto-electrical components during network upgrades. Furthermore, the use of the proposed spectrum slicing technique has a positive side-effect when it comes to security concerns, as the signal spectrum is divided into slices. All slices are necessary to obtain the reconstructed signal and even if an eavesdropper gets most of the slices it is still not enough. The simulation results show that the proposed spectrum slicing and stitching approach is a viable solution to overcome the problem of limited frequency bandwidth of electrical components.

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36

Li, Yongcheng, Hai Shen, and Manxi Wang. "Spectrum Allocation of Cognitive Radio Based on Autonomy Evolutionary Algorithm." Cybernetics and Information Technologies 16, no. 4 (2016): 87–97. http://dx.doi.org/10.1515/cait-2016-0070.

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Abstract Reasonable and effective allocation of cognitive radio spectrum resource according to user’s requirements is the key task of cognitive radio network. Cognitive radio spectrum allocation problem can be viewed as an optimization problem. This paper analyzes the application of bio-inspired intelligent algorithm in cognitive radio network spectrum allocation, and based on graph theory model of spectrum allocation, proposesaspectrum allocation algorithm based on autonomously evolutionary scheme. Three objective functions: Max-Min-Reward, Max-Sum- Reward and Max-Proportional-Fair are employed to evaluate the proposed algorithm capacity. The simulation result reveals that the proposed method can make the system user to obtain better network benefits and better embody the fairness between cognitive users. In the process of allocation, the proposed method was not restricted by user scale and the number of spectrums.

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37

Cao, Shilong, Fei Lin, and Jiemei Liu. "Performance Analysis of Cognitive SWIPT Ergodic Capacity Based on Different Selection Policies." Wireless Communications and Mobile Computing 2022 (June 25, 2022): 1–9. http://dx.doi.org/10.1155/2022/5865303.

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The advent of 5G era and the increase of terminal’s numbers have led to increasing demand for spectrum resources and energy simultaneously. Therefore, this paper studies how to combine the cognitive radio (CR) and the Simultaneous Wireless Information and Power Transfer (SWIPT) technology effectively in a multiuser scenario, in which the spectrum utilization and energy efficiency are both improved. Firstly, the system model is designed of above cognitive SWIPT system, in which the cognitive users (CU) can choose spectrum access policy based on the amount of data transmission of licensed user. And then, according to cognitive users’ channel conditions and forwarding power, a concept of trust value and different relay selection policies is proposed. Subsequently, the according system ergodic capacity is analyzed. Finally, simulation results of system performance are provided to validate the analytical results. It shows that cognitive SWIPT technology can improve the system ergodic capacity and the spectrum access opportunities of cognitive users effectively, thereby improving the efficiency of energy and spectrum utilization.

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38

Albonda, Haider, Kadhum Al-Majdi, and Bahaa Abbas. "Developing capacity sharing strategy for vehicular networks with integrated use of licensed and unlicensed spectrum." EUREKA: Physics and Engineering, no. 3 (May 31, 2022): 149–58. https://doi.org/10.21303/2461-4262.2022.002352.

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A widely deployed cellular network, supported by direct connections, can offer a promising solution that supports new services with strict requirements on access availability, reliability, and end-to-end (E2E) latency. The communications between vehicles can be made using different radio interfaces: One for cellular communication (i.e., cellular communication over the cellular network based on uplink (UL)/downlink (DL) connections) and the other for direct communication (i.e., D2D-based direct communications between vehicles which allows vehicular users (V-UEs) to communicate directly with others). Common cellular systems with licensed spectrum backed by direct communication using unlicensed spectrum can ensure high quality of service requirements for new intelligent transportation systems (ITS) services, increase network capacity and reduce overall delays. However, selecting a convenient radio interface and allocating radio resources to users according to the quality of service (QoS) requirements becomes a challenge. In this regard, let's introduce a new radio resource allocation strategy to determine when it's appropriate to establish the communication between the vehicles over a cellular network using licensed spectrum resources or D2D-based direct connections over unlicensed spectrum sharing with Wi-Fi. The proposed strategy aims at meeting the quality of service requirements of users, including reducing the possibility of exceeding the maximum delay restrictions and enhancing network capacity utilization in order to avoid service interruption. The proposed solution is evaluated by highlighting different conditions for the considered scenario, and it is demonstrated that the proposed strategy improves network performance in terms of transmitted data rate, packet success rate, latency, and resource usage

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39

Mohamed, Elalem. "Effective Capacity Analysis for Cognitive Networks under 𝐐𝐨𝐒 Satisfaction". Journal of Information Sciences and Computing Technologies 5, № 3 (2016): 498–518. https://doi.org/10.5281/zenodo.3968427.

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Spectrum sensing and dynamic spectrum access (DSA) techniques in cognitive radio networks (CRN) have been extensively investigated since last decade. Recently, satisfaction of quality-of-service (QoS) demands for secondary users (SU) has attracted great attention. The SU can not only discover the transmission opportunities, but also cognitively adapts the dynamic spectrum access strategies to its own QoS requirement and the environment variations. In this paper, we study how the delay QoS requirement affects the strategy on network performance. We first treat the delay-QoS in interference constrained cognitive radio network by applying the effective capacity concept, focusing on the two dominant DSA schemes: underlay and overlay. We obtain the effective capacity of the secondary network and determine the power allocation policies that maximize the throughput of the cognitive user. The underlay and overlay approaches may have their respective advantages under diverse propagation environment and system parameters. If the cognitive network can dynamically choose the DSA strategy under different environment, its performance could be further improved. We propose a selection criterion to determine whether to use underlay or overlay scheme under the given QoS constraint and the PUs’ spectrum-occupancy probability. Thus, the throughput of the CRN could be increased. Performance analysis and numerical evaluations are provided to demonstrate the effective capacity of CRN based on the underlay and the overlay schemes, taking into consideration the impact of delay QoS requirement and other related parameters.

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40

Wang, Sen, Xueyan Han, Haoran Li, Hongyu Xu, and Shihua Li. "Kinematic analysis and bearing capacity optimization of fully decoupled two-rotation mechanisms." Mechanical Sciences 15, no. 1 (2024): 111–21. http://dx.doi.org/10.5194/ms-15-111-2024.

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Abstract. The existing vehicle durability test platform has low accuracy in reproducing the road spectrum and cannot meet the demand for high-accuracy road spectrum reproduction. In order to meet the need for high accuracy in road spectrum reproduction of vehicle durability tests, this paper is based on an analysis of the factors affecting the accuracy of the test platform. From the perspective of mechanism innovation, a fully decoupled two-rotation parallel mechanism with large load-bearing capacity for vehicle durability testing is proposed in this paper. A new solution is provided to improve the road spectrum reproduction accuracy of the test platform. Based on the requirement of reproduction accuracy of a real road spectrum, inverse kinematics, velocity Jacobians, and workspaces of mechanisms are analyzed. The inverse kinematics and velocity Jacobian analysis of parallel mechanisms can lay a research foundation for the subsequent calculation of load-bearing capacity indexes. The design of the parallel mechanism is based on the performance requirements of large load capacity and complete decoupling. A new index for evaluating the global average carrying capacity of a mechanism is proposed. Based on this index and the atlas method, the dimensional parameters of the mechanism have been optimized. A finite-element simulation study is carried out, and it is proved that the optimized fully decoupled two-rotation parallel mechanism can satisfy the bearing capacity requirements of the platform test. The large load capacity and fully decoupled mechanism proposed in the research work of this paper can improve the road spectrum reproduction accuracy of the vehicle durability test platform and has good application prospects in the field of vehicle durability tests.

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41

Gu, Yu Feng, Peng Ju Li, and Ya Nan Ya. "Research on Applied-Technology for Capacity with Variable Parameter Iteration Method." Advanced Materials Research 1014 (July 2014): 459–62. http://dx.doi.org/10.4028/www.scientific.net/amr.1014.459.

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Two-dimensional NMR spectrum can give reliable conclusion when it is used to identify and evaluate the testing fluid, and two-dimensional NMR inversion method is the key to get the spectrum Aiming at the deficiency of inversed results’ accuracy and computing speed in TSVD method, the variable parameter iteration method is proposed which include the singular value packet processing algorithm that mainly used to lay the foundation for the reliability of the results, and the variable parameter iteration algorithm that mainly used to speed up the iteration computing. In numerical simulation test, the variable parameter iteration method can restore the constructional diffusion-relaxation spectrum accurately and quickly compared with TSVD method. In oil-water experimental test, the spectrum inversed from variable parameter iteration method can identify the types of testing fluid correctly, and the relative error of oil saturation is 0.6% or 1.9% when oil water ratio is 3 to 1 or 1 to 2, the error are small that indicates the accuracy of the results got from the method is high. Variable parameter iteration method can process the real two-dimensional NMR data rapidly and efficiently, and the quality of the inversed diffusion-relaxation spectrum is high, which shows that the method has practical capacity and has the role of guiding the research of new inversion methods.

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42

Priestley, M. J. N. "Does capacity design do the job?" Bulletin of the New Zealand Society for Earthquake Engineering 36, no. 4 (2003): 276–92. http://dx.doi.org/10.5459/bnzsee.36.4.276-292.

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Current provisions in the New Zealand Loadings code for dynamic amplification of moment and shear force in cantilever wall buildings are critically examined. Based on time-history analyses of six wall structures, from two- to twenty-storeys, it is found that higher mode effects are inadequately represented by either the equivalent lateral force or modal response spectrum design methods. The time-history results indicate that dynamic amplification is dependent on both initial period, and expected displacement ductility level. Two different methods for consideration of higher mode effects in cantilever walls are proposed. The first is based on a simple modification of the modal response spectrum method, while the second is appropriate for single-mode design approaches such as the equivalent lateral force method. Both are found to give excellent representation of expected response. It is shown that providing capacity protection at the design seismic intensity does not ensure against undesirable failure modes at intensities higher than the design level. This has significance for the design of critical facilities, such as hospitals.

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Naumov, V. N., G. I. Frolova та E. B. Amitin. "Analysis of experimental heat capacity of HoBa2Cu3O7–δ: electron heat capacity and phonon spectrum characteristics". Low Temperature Physics 22, № 5 (1996): 432–34. https://doi.org/10.1063/10.0034009.

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The electron component γT of heat capacity was derived from the experimental data on the heat capacity of HoBa2Cu3O7–δ in the normal state (above Tc). The heat capacity was divided into phonon and electron components by using a special technique based on the representation of lattice heat capacity in terms of a finite number of moments Θi of the phonon density of states. Apart from the value of γ, numerical values of the second moment Θ2, the fourth moment Θ4, and the effective moment Θ* characterizing the upper limit of the phonon density of states were also obtained. In comparison to the phonon spectrum of YBCO, the phonon spectrum of HoBCO is in general softer due to the replacement of the lighter Y ion by the heavier Ho ion. Such a softening of the phonon density of states makes it possible to separate the electron heat capacity in HoBa2Cu3 O7–δ in the superconducting transition region, as well as the heat capacity jump ΔC.

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Yongkang, Shen, and Wang Zhengzhong. "Seismic Performance Evaluation on Eccentrically Brace Steel Frame by Capacity Spectrum Method." Applied Mechanics and Materials 166-169 (May 2012): 752–55. http://dx.doi.org/10.4028/www.scientific.net/amm.166-169.752.

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According to the seismic demand spectra form the code for seismic design of buildings, seismic performances of eccentrically braced steel frames (EBF) in frequently, fortification and seldom occurred different intensity earthquakes were evaluated by the Capacity Spectrum Method (CSM). The capacity curves derived from base force-top displacement curves of structures subjected to the lateral seismic load of seismic codes were obtained from pushover analysis by applying sap2000 software and transformed to the spectrum curves, seismic performance were evaluated according to the intersection between the seismic demand spectra and the capacity spectrum. Seismic performances of 15 EBFs designed according to the Chinese design codes were evaluated by CSM. The certain ductility and displacement capacity of EBF in accordance with the China corresponding design codes are shown and some reference is suggested.

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Gbenga-ilori, Abiodun, and Olufunmilayo Sanusi. "Markovian Queueing Model for Throughput Maximization in D2D-Enabled Cellular Networks." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 5 (2018): 3767. http://dx.doi.org/10.11591/ijece.v8i5.pp3767-3777.

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Device-to-Device (D2D) communication has been considered a key enabling technology that can facilitate spectrum sharing in 4G and 5G cellular networks. In order to meet the high data rate demands of these new generation cellular networks, this paper considers the optimization of available spectrum resource through dynamic spectrum access. The utilization of continuous-time Markov chain (CTMC) model for efficient spectrum access in D2D-enabled cellular networks is investigated for the purpose of determining the impact of this model on the capacity improvement of cellular networks. The paper considers the use of CTMC model with both queueing and non-queueing cases called 13-Q CTMC and 6-NQ CTMC respectively with the aim of improving the overall capacity of the cellular network under a fairness constraint among all users. The proposed strategy consequently ensures that spectrum access for cellular and D2D users is optimally coordinated by designing optimal spectrum access probabilities. Numerical simulations are performed to observe the impact of the proposed Markovian queueing model on spectrum access and consequently on the capacity of D2D-enabled cellular networks. Results showed that the proposed 13-Q CTMC provide a more spectrum-efficient sharing scheme, thereby enabling better network performances and larger capabilities to accommodate more users.

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Abiodun, Gbenga-Ilori, and Sanusi Olufunmilayo. "Markovian Queueing Model for Throughput Maximization in D2D-Enabled Cellular Networks." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 5 (2018): 3767–77. https://doi.org/10.11591/ijece.v8i5.pp3767-3777.

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Device-to-Device (D2D) communication has been considered a key enabling technology that can facilitate spectrum sharing in 4G and 5G cellular networks. In order to meet the high data rate demands of these new generation cellular networks, this paper considers the optimization of available spectrum resource through dynamic spectrum access. The utilization of continuous-time Markov chain (CTMC) model for efficient spectrum access in D2D-enabled cellular networks is investigated for the purpose of determining the impact of this model on the capacity improvement of cellular networks. The paper considers the use of CTMC model with both queueing and non-queueing cases called 13-Q CTMC and 6-NQ CTMC respectively with the aim of improving the overall capacity of the cellular network under a fairness constraint among all users. The proposed strategy consequently ensures that spectrum access for cellular and D2D users is optimally coordinated by designing optimal spectrum access probabilities. Numerical simulations are performed to observe the impact of the proposed Markovian queueing model on spectrum access and consequently on the capacity of D2D-enabled cellular networks. Results showed that the proposed 13-Q CTMC provide a more spectrum efficient sharing scheme, thereby enabling better network performances and larger capabilities to accommodate more users.

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Kruys, Jan, Peter Anker, and Roel Schiphorst. "Spectrum sharing metrics." info 16, no. 5 (2014): 19–31. http://dx.doi.org/10.1108/info-03-2014-0013.

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Purpose – The purpose of this paper is to propose technology-independent metrics for measuring spectrum utilization efficiency and spectrum sharing which could prove useful in spectrum management. Radio spectrum is considered a scarce resource. The rapid rise in all kinds of wireless devices emphasizes the need for spectrum usage efficiency and spectrum sharing. Notably in license exempt spectrum, the increased density of radio devices requires new methods of evaluating their performance. Design/methodology/approach – The authors go back to the fundamentals of spectrum utilization and show that under high usage conditions, wireless network performance is interference limited. The impact of interference depends both on the environment and on the type of modulation used. The authors use these factors to derive the above metrics. Findings – The main findings of this work are metrics for spectrum utilization and sharing that are technology-independent and therefore widely applicable, notably to license exempt spectrum. These metrics provide increased visibility of receiver performance in determining spectrum use. The authors also find that the capacity of a wireless network is for all practical purposes unlimited – provided the appropriate choices of the technical parameters are made, recognizing the impact of the propagation environment. Research limitations/implications – Because the authors proceed from simplifying assumptions, detailed analysis and prediction of spectrum-sharing cases may require additional parameters to be added to the equations given. Practical implications – The results of this work have potential application in spectrum management and in the development of regulatory requirements for license exempt spectrum. Originality/value – New in this paper is the derivation of spectrum utilization and sharing metrics from first principles that allow different technologies to be compared. The authors also show that, given the right choice of technical parameters, the capacity of wireless networks is practically unlimited.

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Saha, Rony Kumer. "Realization of Licensed/Unlicensed Spectrum Sharing Using eICIC in Indoor Small Cells for High Spectral and Energy Efficiencies of 5G Networks." Energies 12, no. 14 (2019): 2828. http://dx.doi.org/10.3390/en12142828.

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In this paper, we show how to realize numerous spectrum licensing policies by means of time-domain enhanced inter-cell interference coordination (eICIC) technique to share both the licensed and unlicensed spectrums with small cells in order to address the increasing demand of capacity, spectral efficiency, and energy efficiency of future mobile networks. Small cells are deployed only in 3-dimensional (3D) buildings within a macrocell coverage of a mobile network operator (MNO). We exploit the external wall penetration loss of each building to realize traditional dedicated access, co-primary shared access (CoPSA), and licensed shared access (LSA) techniques for the licensed spectrum access, whereas, for the unlicensed spectrum access, the licensed assisted access (LAA) technique operating in the 60 GHz unlicensed band is realized. We consider that small cells are facilitated with dual-band, and derive the average capacity, spectral efficiency, and energy efficiency metrics for each technique. We perform extensive evaluation of various performance metrics and show that LAA outperforms considerably all other techniques concerning particularly spectral and energy efficiencies. Finally, we define an optimal density of small cells satisfying both the spectral efficiency and energy efficiency requirements for the fifth-generation (5G) mobile networks.

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Noel, Jean-Paul, Ling-Qi Zhang, Alan A. Stocker, and Dora E. Angelaki. "Individuals with autism spectrum disorder have altered visual encoding capacity." PLOS Biology 19, no. 5 (2021): e3001215. http://dx.doi.org/10.1371/journal.pbio.3001215.

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Perceptual anomalies in individuals with autism spectrum disorder (ASD) have been attributed to an imbalance in weighting incoming sensory evidence with prior knowledge when interpreting sensory information. Here, we show that sensory encoding and how it adapts to changing stimulus statistics during feedback also characteristically differs between neurotypical and ASD groups. In a visual orientation estimation task, we extracted the accuracy of sensory encoding from psychophysical data by using an information theoretic measure. Initially, sensory representations in both groups reflected the statistics of visual orientations in natural scenes, but encoding capacity was overall lower in the ASD group. Exposure to an artificial (i.e., uniform) distribution of visual orientations coupled with performance feedback altered the sensory representations of the neurotypical group toward the novel experimental statistics, while also increasing their total encoding capacity. In contrast, neither total encoding capacity nor its allocation significantly changed in the ASD group. Across both groups, the degree of adaptation was correlated with participants’ initial encoding capacity. These findings highlight substantial deficits in sensory encoding—independent from and potentially in addition to deficits in decoding—in individuals with ASD.

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Saha, Rony Kumer. "A Hybrid Interweave–Underlay Countrywide Millimeter-Wave Spectrum Access and Reuse Technique for CR Indoor Small Cells in 5G/6G Era." Sensors 20, no. 14 (2020): 3979. http://dx.doi.org/10.3390/s20143979.

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In this paper, we propose a hybrid interweave–underlay spectrum access and reuse technique for the dynamic spectrum access and reuse of the countrywide 28 GHz millimeter-wave (mmWave) spectrum to in-building small cells of each mobile network operator (MNO) in a country. For the spectrum access, the proposed technique explores both interweave and underlay spectrum access techniques, whereas, for the spectrum reuse, it considers reusing the countrywide spectrum to each three-dimensional (3D) cluster of small cells in a building. To access the countrywide spectrum, each MNO is considered by paying a licensing fee following its number of subscribers. We present the 3D clustering of in-building of small cells and derive average capacity, spectral efficiency (SE), and energy efficiency (EE). We then perform extensive numerical and simulation results and analyses for an MNO of a country consisting of four MNOs. It is shown that, for no spectrum reuse to in-building small cells, the proposed technique improves average capacity and SE by 3.63 and 2.42 times, respectively, whereas EE improves by 72.79%. However, for vertical spatial reuse of six times (as an example) to small cells in a building, average capacity, SE, and EE improve further by 21.77 times, 14.51 times, and 95.66%, respectively. Moreover, the proposed technique can satisfy SE and EE requirements for sixth-generation (6G) mobile systems by horizontal spatial reuse of the countrywide spectrum to small cells of about 40.62%, 9.37%, and 6.25% less buildings than that required by the traditional static licensed spectrum access (SLSA) technique.

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