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Artykuły w czasopismach na temat „Multi-user detector”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 31 stycznia 2023

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1

Xiao, P., and R. Liu. "Multi-user detector for multi-carrier CDMA systems." Electronics Letters 44, no. 23 (2008): 1366. http://dx.doi.org/10.1049/el:20082130.

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2

Bar-Ness, Y., and J. B. Punt. "Adaptive ?Bootstrap? CDMA multi-user detector." Wireless Personal Communications 3, no. 1-2 (1996): 55–71. http://dx.doi.org/10.1007/bf00333923.

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3

TAM, WAI MAN, FRANCIS C. M. LAU, and CHI K. TSE. "AN APPROACH TO CALCULATE THE BIT ERROR RATES OF MULTIPLE ACCESS CHAOTIC-SEQUENCE SPREAD-SPECTRUM COMMUNICATION SYSTEMS EMPLOYING MULTI-USER DETECTORS." International Journal of Bifurcation and Chaos 14, no. 01 (January 2004): 183–206. http://dx.doi.org/10.1142/s0218127404009181.

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In a multiple access spread-spectrum communication system, the bit error performance is usually limited by the mutual interference between users. The use of multi-user detection is an effective method to reduce such interference. In this paper, we consider two linear multi-user detectors, namely, decorrelating detector and minimum mean-square-error detector, applied to a multiple access chaotic-sequence spread-spectrum communication system. An approach to calculate the bit error rate (BER) for such systems is presented. The calculated BERs are compared with those obtained using brute-force com

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4

AZMI, PAEIZ. "MULTIUSER INTERFERENCE SUPPRESSION TECHNIQUES FOR DIRECT-SEQUENCE CDMA COMMUNICATION SYSTEMS." Fluctuation and Noise Letters 08, no. 03n04 (December 2008): L323—L332. http://dx.doi.org/10.1142/s0219477508005094.

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In this paper, several techniques for multi-user interference suppression from power-controlled direct-sequence CDMA systems are proposed and the emphasis is on the one-shot structure. The proposed schemes arise from the optimum detector that takes into account the existence of power-controlled chip-synchronous multi-user interference and white Gaussian noise. Restricting the multi-user interference to the power-controlled chip-synchronous case strongly reduces the complexity of the optimum detector. For more reduction in the complexity, some approximations of the obtained techniques are also

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5

ARAI, YOSHIKAZU, KIYOMI IGARASHI, ATSUSHI FUKASAWA, and YUMI TAKIZAWA. "MULTI-USER DETECTION TO ENHANCE THE CAPACITY OF W-CDMA BASED ON THE CONJUGATE GRADIENT METHOD." Journal of Circuits, Systems and Computers 13, no. 02 (April 2004): 313–23. http://dx.doi.org/10.1142/s0218126604001386.

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Multiple users communicate with individually-assigned codes on a single radio carrier frequency in a DS-CDMA system. Mutual interference among codes limits the capacity of the system. Conventional detectors of receivers are designed for a single-user neglecting the mutual interference. Multi-user detection is expected to enhance the capacity by removing the interference factors. In this paper, a new scheme is proposed corresponding to solving a huge matrix equation under multiple access interference (MAI) environments. This scheme is obtained by the mathematical approach to solve a huge matrix

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6

van der Merwe, Johannes Rossouw, Alexander Rügamer, and Wolfgang Felber. "Blind Spoofing GNSS Constellation Detection Using a Multi-Antenna Snapshot Receiver." Sensors 19, no. 24 (December 10, 2019): 5439. http://dx.doi.org/10.3390/s19245439.

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Spoofing of global navigation satellite system (GNSS) signals threatens positioning systems. A counter-method is to detect the presence of spoofed signals, followed by a warning to the user. In this paper, a multi-antenna snapshot receiver is presented to detect the presence of a spoofing attack. The spatial similarities of the array steering vectors are analyzed, and different metrics are used to establish possible detector functions. These include subset methods, Eigen-decomposition, and clustering algorithms. The results generated within controlled spoofing conditions show that a spoofed co

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7

Mitra, Rangeet, and Vimal Bhatia. "Kernel-based parallel multi-user detector for massive-MIMO." Computers & Electrical Engineering 65 (January 2018): 543–53. http://dx.doi.org/10.1016/j.compeleceng.2017.02.005.

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8

Ranga Rao, Md. "Multi User Detector in CDMA Using Elliptic Curve Cryptography." International Journal of VLSI Design & Communication Systems 3, no. 1 (February 29, 2012): 51–67. http://dx.doi.org/10.5121/vlsic.2012.3105.

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9

Bani, Kavita, and Vaishali Kulkarni. "Comparison of Single User with Multi User Cooperative Spectrum Sensing for Energy Detector at Low SNR Wall." Journal of Physics: Conference Series 2070, no. 1 (November 1, 2021): 012083. http://dx.doi.org/10.1088/1742-6596/2070/1/012083.

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Abstract With rapidly increasing demand in wireless communication, available licensed spectrum resources should be utilized efficiently and actively. Cognitive radio is a device which learns from surrounding environment and transmit its signal when license spectrum is unutilized. Spectrum sensing is the need for Cognitive radio. In this paper, Energy detector is implemented though MATLAB software for single and multiusers. Region of Convergence (ROC) curve is plotted for both normal ED and Cooperative spectrum sensing ED. Results show while increasing number of samples from 1k to 100k, probabi

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10

Partibane, B., V. Nagarajan, K. S. Vishvaksenan, and R. Kalidoss. "Performance of Multi-User Transmitter Pre-Processing Assisted Multi-Cell IDMA System for Downlink Transmission." Fluctuation and Noise Letters 14, no. 03 (June 29, 2015): 1550030. http://dx.doi.org/10.1142/s0219477515500303.

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In this paper, we present the performance of multi-user transmitter pre-processing (MUTP) assisted coded-interleave division multiple access (IDMA) system over correlated frequency-selective channels for downlink communication. We realize MUTP using singular value decomposition (SVD) technique, which exploits the channel state information (CSI) of all the active users that is acquired via feedback channels. We consider the MUTP technique to alleviate the effects of co-channel interference (CCI) and multiple access interference (MAI). To be specific, we estimate the CSI using least square error

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11

Liang, Sheng, Yong Xie, Gao Feng Pan, Jun Xue, and Xin Feng Yu. "Simulation and Analysis of Linear Multiple User Detection Based on Simulink." Applied Mechanics and Materials 263-266 (December 2012): 354–59. http://dx.doi.org/10.4028/www.scientific.net/amm.263-266.354.

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In order to study the feasibility of linear Multiple User Detection (MUD) used in multi-objective spread spectrum TT&C, mathematical models of Decorrelation Algorithm (DEC) and Minimum Mean Square Error Algorithm (MMSE) are built. Simulation framework based on Simulink is given. Two algorithms are compared with traditional single user detector. The results of simulation show the two linear MUDs are better than traditional single user detection.

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12

Yang, Xuezhi, and Branka Vucetic. "A Frequency Domain Multi-User Detector for TD-CDMA Systems." IEEE Transactions on Communications 59, no. 9 (September 2011): 2424–33. http://dx.doi.org/10.1109/tcomm.2011.062111.090546.

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13

LIU, Ting, Liyi ZHANG, Weiwei BAO, and Kang ZOU. "Multi-user detector based on improved binary artificial bee colony algorithm." Journal of Computer Applications 33, no. 1 (September 23, 2013): 171–74. http://dx.doi.org/10.3724/sp.j.1087.2013.00171.

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14

Dua, A. "Adaptive implementation of polynomial expansion detector for multi-user detection in DS-CDMA systems." Electronics Letters 37, no. 23 (2001): 1384. http://dx.doi.org/10.1049/el:20010960.

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15

Sridhar, Bommidi, and Srinivasulu Tadisetty. "Efficient Recursive Least Square Technique for Spectrum Sensing in Cognitive Radio Networks." International Journal of Business Data Communications and Networking 15, no. 2 (July 2019): 1–14. http://dx.doi.org/10.4018/ijbdcn.2019070101.

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Cognitive radio-based systems rely on spectrum sensing techniques to detect whitespaces to exploit. Cognitive radio (CR) is an attractive approach to face the shortage in the electromagnetic spectrum resources and improve the overall spectrum utilization. However, Energy detectors perform far from optimally by affecting the performance of the underlying system. In this article, two spectrum-sensing techniques are considered for CR networks; one based on energy detection and the other based on multi-taper spectral estimation (MSE). This article proposes a new method to optimize the overall perf

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16

Alami, Fadoua Thami, Noura Aknin, Najat Erradi, and Ahmed El Moussaoui. "Capacity Enhancement by Using a Multi-User Detector on Uplink Synchronous Mode." International Journal of Information Technology and Computer Science 8, no. 6 (June 8, 2016): 21–27. http://dx.doi.org/10.5815/ijitcs.2016.06.03.

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17

Amiri, Kiarash, Joseph R. Cavallaro, Chris Dick, and Raghu Mysore Rao. "A High Throughput Configurable SDR Detector for Multi-user MIMO Wireless Systems." Journal of Signal Processing Systems 62, no. 2 (April 8, 2009): 233–45. http://dx.doi.org/10.1007/s11265-009-0360-5.

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18

Boudaa, Ahmed. "Combining SFBC_OFDM Systems with SVD Assisted Multiuser Transmitter and Multi user Detector." IOSR Journal of Electronics and Communication Engineering 6, no. 6 (2013): 24–28. http://dx.doi.org/10.9790/2834-0662428.

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19

Huang, Yung-Fa, Tan-Hsu Tan, Chia-Hsin Cheng, Wei-Chen Lai, and Hsing-Chung Chen. "Performance of a novel evolutionary genetic-based multi-user detector for multi-carrier CDMA communication systems." Soft Computing 21, no. 4 (August 19, 2015): 1031–39. http://dx.doi.org/10.1007/s00500-015-1838-7.

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20

Del Re, E., R. Fantacci, S. Morosi, and A. Pugi. "Advanced blind adaptive multi-user detector for communications in nonstationary multipath fading channel." IEEE Transactions on Vehicular Technology 50, no. 6 (2001): 1497–506. http://dx.doi.org/10.1109/25.966580.

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21

Tomita, Mitsuhiro, Noriyoshi Kuroyanagi, Satoru Ozawa, and Naoki Suehiro. "A multi-user CDMA receiver utilizing decorrelating detector with additional dummy pilot response." International Journal of Communication Systems 16, no. 3 (2003): 249–71. http://dx.doi.org/10.1002/dac.586.

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22

Yakhelef, Mohammed, and L. Saidi. "A LINEAR HYBRID MULTI-USER DETECTOR BASED ON SUCCESSIVE INTERFERENCE CANCELLATION AND DECORRELATOR DETECTOR FOR DS/CDMA SYSTEM." Telecommunications and Radio Engineering 79, no. 1 (2020): 39–45. http://dx.doi.org/10.1615/telecomradeng.v79.i1.40.

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23

Zhang, Xu, Peng, Lu, and Zhang. "Rateless Coded Uplink Transmission Design for Multi-User C-RAN." Sensors 19, no. 13 (July 5, 2019): 2978. http://dx.doi.org/10.3390/s19132978.

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Cloud radio access network (C-RAN) is a promising technology for the Internet of Things (IoT). In C-RAN, the remote radio head (RRH) and baseband unit (BBU) in the conventional base station are separated, and each BBU is backward centralized into a virtual BBU pool. In this paper, we consider the uplink transmission for the two-user C-RAN with two RRHs under a block fading channel. A novel rateless coded transmission scheme is designed. During each transmission round, each user keeps transmitting to the RRHs using Raptor code until the BBU pool feeds back an acknowledgement (ACK). With the pro

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24

Jia Dongli, and Zheng Guoxin. "Memetic Differential Evolution Assisted Minimum Bit Error Rate Detector for Multi-user MIMO System." International Journal of Digital Content Technology and its Applications 5, no. 2 (February 28, 2011): 224–29. http://dx.doi.org/10.4156/jdcta.vol5.issue2.26.

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25

Kerouédan, Sylvie, Makram Touzri, Patrick Adde, and Samir Saoudi. "A Turbo Decoder Included in a Multi-User Detector: A Solution to be Retained." International Journal of Communications, Network and System Sciences 03, no. 10 (2010): 826–34. http://dx.doi.org/10.4236/ijcns.2010.310112.

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26

Hatsui, Takaki, Shun Ono, Togo Kudo, Kazuo Kobayashi, Takashi Kameshima, Kyosuke Ozaki, Yoichi Kirihara, Motohiko Omodani, and Nobukazu Teranishi. "Detector Development Status and Outlook of the SACLA/SPring-8 Site." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C686. http://dx.doi.org/10.1107/s2053273314093139.

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X-ray Free-Electron Laser facility, SACLA has been operational for more than 2 years. During the user runs, multi-port charge coupled device (MPCCD) detectors has been extensively used to deliver novel scientific results. In order to strengthen the facility capability, we are developing new variants of the MPCCD detectors[1]. Because some of the features such as high peak signal detection cannot be implemented by CCD technology, novel monolithic process based on silicon-on-insulator (SOI) sensor technology is under development. By employing the novel process, we are developing SOPHIAS sensor t

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27

Arora, Mehul, Sarthak Naithani, and Anu Shaju Areeckal. "A web-based application for face detection in real-time images and videos." Journal of Physics: Conference Series 2161, no. 1 (January 1, 2022): 012071. http://dx.doi.org/10.1088/1742-6596/2161/1/012071.

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Abstract Face detection is widely used in the consumer industry such as advertising, user interfaces, video streaming apps and in many security applications. Every application has its own demands and constraints, and hence cannot be fulfilled by a single face detection algorithm. In this work, we developed an interactive web-based application for face detection in real-time images and videos. Pretrained face detection algorithms, namely Haar cascade classifier, HOG-based frontal face detector, Multi-task Cascaded Convolutional Neural Network (MTCNN) and Deep Neural Network (DNN), were used in

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28

Sarasti-Zambonino, Sebastián, Tania Barahona, and Santos Roque. "Simulation of a HPGe Detector with GEANT4." Revista Politécnica 50, no. 2 (August 4, 2022): 7–14. http://dx.doi.org/10.33333/rp.vol50n2.01.

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Gamma spectroscopy is an analytic technique that identifies isotopes through gamma rays. Currently, gamma spectroscopy is widely used in several science fields, for instance, the study of the hydrodynamics of soils and other applications. Considering the development of computers, it has been developed Monte-Carlo simulation packages, in order to estimate the response of gamma spectroscopy detectors. This work aims to develop a GEANT4 application to estimate the full energy peak efficiency for a HPGe detector and determine the deviation with experimental data. It was carried out measurements of

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29

Zhou, Liqing, Henry Leung, Peng Xu, Guobao Ru, Quansheng Zhao, and Da Xu. "The Kalman Filtering Blind Adaptive Multi-user Detector Based on Tracking Algorithm of Signal Subspace." Information 6, no. 1 (January 20, 2015): 3–13. http://dx.doi.org/10.3390/info6010003.

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30

Cao, Wen-Fei, Yi-Zheng Zhen, Yu-Lin Zheng, Shuai Zhao, Feihu Xu, Li Li, Zeng-Bing Chen, Nai-Le Liu, and Kai Chen. "Open-Destination Measurement-Device-Independent Quantum Key Distribution Network." Entropy 22, no. 10 (September 26, 2020): 1083. http://dx.doi.org/10.3390/e22101083.

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Quantum key distribution (QKD) networks hold promise for sharing secure randomness over multi-partities. Most existing QKD network schemes and demonstrations are based on trusted relays or limited to point-to-point scenario. Here, we propose a flexible and extensible scheme named as open-destination measurement-device-independent QKD network. The scheme enjoys security against untrusted relays and all detector side-channel attacks. Particularly, any users can accomplish key distribution under assistance of others in the network. As an illustration, we show in detail a four-user network where t

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31

Kumar, N. Sathish, and K. R. Shankar Kumar. "Performance Analysis of a Successive Interference Cancellation for Multi-user Detector with VBLAST MIMO wireless Channel." i-manager's Journal on Future Engineering and Technology 5, no. 3 (April 15, 2010): 49–53. http://dx.doi.org/10.26634/jfet.5.3.1144.

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32

Wang, Jieling, Hong Yang, Xiaolin Hu, and Xianbin Wang. "An Adaline Neural Network-Based Multi-User Detector Improved by Particle Swarm Optimization in CDMA Systems." Wireless Personal Communications 59, no. 2 (January 19, 2010): 191–203. http://dx.doi.org/10.1007/s11277-009-9912-z.

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33

Yekhlef, Mohammed, and Lamir Saidi. "A low complexity multi‐user detector based on G‐SIC and PIC for DS/CDMA systems." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 31, no. 6 (November 9, 2012): 1815–34. http://dx.doi.org/10.1108/03321641211267137.

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34

Kumar, Indrajeet, and Ritesh Kumar Mishra. "An Investigation of Spectral Efficiency in Linear MRC and MMSE Detectors with Perfect and Imperfect CSI for Massive MIMO Systems." Traitement du Signal 38, no. 2 (April 30, 2021): 495–501. http://dx.doi.org/10.18280/ts.380229.

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In this paper, the performance of two linear detectors in multi-user (MU) multiple-input multiple-output (MIMO) systems is investigated. The uplink sum rate and lower bound of channel capacity is derived for both maximum-ratio combination (MRC) and minimum mean square error (MMSE) schemes considering imperfect and perfect channel state information (CSI) conditions. Results show that linear detector performance improves dramatically when the number of base station (BS) users is smaller than that of BS antennas. It is being demonstrated that in the case of imperfect CSI and the number of BS ante

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35

Nazrul Islam, A. K. M., and S. P. Majumder. "Effect of Pointing Error on BER Performance of a Multi-wavelength OCDMA FSO System with SIK Dual Detector Receiver." Journal of Optical Communications 40, no. 3 (July 26, 2019): 247–53. http://dx.doi.org/10.1515/joc-2017-0047.

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Abstract A novel analytical approach is presented to evaluate the bit error rate (BER) performance of a multi-wavelength optical code division multiple access (MW-OCDMA) free space optical (FSO) system using optical domain encoder and sequence inverse keying (SIK) balanced photodetector direct detection receiver taking the effect of pointing errors into considerations. The analysis is carried out to find the expression for the signal, multi-access interference (MAI) and crosstalk at the output of the SIK receiver in presence of pointing error. The BER performance results are evaluated for diff

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36

Botsinis, Panagiotis, Soon Xin Ng, and Lajos Hanzo. "Quantum Search Algorithms, Quantum Wireless, and a Low-Complexity Maximum Likelihood Iterative Quantum Multi-User Detector Design." IEEE Access 1 (2013): 94–122. http://dx.doi.org/10.1109/access.2013.2259536.

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37

Hashesh, Amira Osama, Heba A. Tag El-Dien, Ahmad A. Aziz El-Banna, and Adly Tag El-Din. "Spectrum sensing in single channel and multi-channel cognitive radio networks." Indonesian Journal of Electrical Engineering and Computer Science 16, no. 2 (November 1, 2019): 812. http://dx.doi.org/10.11591/ijeecs.v16.i2.pp812-817.

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<p>Sensing the existence or absence of primary user is the major chore of cognitive radio networks. Nevertheless, Spectrum sensing is the core process of cognitive radio and with target to find idle channels.Various detection techniques exist, however, energy detection is considered as the most used detector because of its lower computational cost. In this paper, we proposed a study of throughput for a cognitive radio system. We had two scenarios, in the first scenario; a study of throughput against probability of false alarm was done; where, only one channel is sensed, to maximize the i

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38

Sinclair, N. W., S. J. Turneaure, Y. Wang, K. Zimmerman, and Y. M. Gupta. "The fast multi-frame X-ray diffraction detector at the Dynamic Compression Sector." Journal of Synchrotron Radiation 28, no. 4 (June 2, 2021): 1216–28. http://dx.doi.org/10.1107/s1600577521003775.

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A multi-frame, X-ray diffraction (XRD) detector system has been developed for use in time-resolved XRD measurements during single-event experiments at the Dynamic Compression Sector (DCS) at the Advanced Photon Source (APS). The system is capable of collecting four sequential XRD patterns separated by 153 ns, the period of the APS storage ring in the 24-bunch mode. This capability allows an examination of the temporal evolution of material dynamics in single-event experiments, such as plate impact experiments, explosive detonations, and split-Hopkinson pressure bar experiments. This system is

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39

Hakimi, Walid, and Ammar Mahmoud. "Performance Evaluation of Space-Time and Harq Diversity in MIMO HSDPA." International Journal of Mobile Computing and Multimedia Communications 4, no. 3 (July 2012): 71–86. http://dx.doi.org/10.4018/jmcmc.2012070105.

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Multi-antenna techniques can be used to achieve improved system performance, including improved system capacity (more users per cell) and improved coverage (possibility for larger cells), as well as improved service provisioning, for example, higher per-user data rates. This study provides an overview of space-time diversity technique using Alamouti codes applied to the 3G evolution. The delays introduced by HARQ retransmission decrease the performance of the HSDPA system. Multi-antenna techniques are specifically applied to HSDPA to avoid HARQ retransmissions. The authors demonstrate that spa

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40

Pazzi, Bianca Maria, Dario Pistoia, and Giancarla Alberti. "RGB-Detector: A Smart, Low-Cost Device for Reading RGB Indexes of Microfluidic Paper-Based Analytical Devices." Micromachines 13, no. 10 (September 23, 2022): 1585. http://dx.doi.org/10.3390/mi13101585.

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A user-friendly, low-cost detector able to read the RGB indexes of microfluidic paper-based analytical devices (µPADs) was developed. The RGB-detector was built with 3D printing using PLA+ and reused Li-ion batteries. It is Arduino-based, which provides an easy interface between the sensor TCS3200, which reads the quadratic wave of the times corresponding to the RGB numbers, the Arduino itself, whose software translates the times into RGB values, and the touchscreen display, NX3224T028, which shows the results. This detector permits multi-sample analysis since it has a sample holder that can k

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41

Suneela, B., E. V. Krishna Rao, Sarat K. Kotamaraju, and K. CH Sri Kavya. "Multi User-Multiple Input Multiple Output Detector Capacity Enhancement by Resource Allocation in Transmission of Physical Layer Network." Journal of Computational and Theoretical Nanoscience 16, no. 5 (May 1, 2019): 2488–94. http://dx.doi.org/10.1166/jctn.2019.7920.

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42

Kucur, Oğuz, and Guillermo E. Atkin. "Performance of Haar wavelet based scale-code division multiple access (HW/S-CDMA) using decorrelating multi-user detector." Computers & Electrical Engineering 31, no. 7 (October 2005): 468–84. http://dx.doi.org/10.1016/j.compeleceng.2005.07.004.

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43

Suchomel, Matthew, Gregory Halder, and Lynn Ribaud. "Synchrotron powder diffraction simplified; management of an APS mail-in program." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C789. http://dx.doi.org/10.1107/s2053273314092109.

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Synchrotrons have revolutionized powder diffraction. They enable rapid collection of data with tremendous angular resolution and exceptional statistics. High resolution powder diffraction beamlines employing multiple single crystal analyzer detectors routinely reveal subtle crystallographic distortions undetectable on other powder instruments, and are an important tool at most modern synchrotrons for structural studies of a diverse range of materials. Beamline 11-BM at the Advanced Photon Source (APS) is a dedicated high resolution (ΔQ/Q ~2×10-4) powder diffraction instrument which uses vertic

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44

Blanchet, Clement E., Alexey V. Zozulya, Alexey G. Kikhney, Daniel Franke, Peter V. Konarev, Weifeng Shang, Robbert Klaering, et al. "Instrumental setup for high-throughput small- and wide-angle solution scattering at the X33 beamline of EMBL Hamburg." Journal of Applied Crystallography 45, no. 3 (May 4, 2012): 489–95. http://dx.doi.org/10.1107/s0021889812013490.

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A setup is presented for automated high-throughput measurements of small-angle X-ray scattering (SAXS) from macromolecular solutions on the bending-magnet beamline X33 of EMBL at the storage ring DORIS-III (DESY, Hamburg). A new multi-cell compartment allows for rapid switching between in-vacuum and in-air operation, for digital camera assisted control of cell filling and for colour sample illumination. The beamline is equipped with a Pilatus 1 M-W pixel detector for SAXS and a Pilatus 300 k-W for wide-angle scattering (WAXS), and results from the use of the Pilatus detectors for scattering st

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Dudak, J., and J. Zemlicka. "Multi bin energy-sensitive micro-CT using large area photon-counting detectors Timepix." Journal of Instrumentation 17, no. 01 (January 1, 2022): C01028. http://dx.doi.org/10.1088/1748-0221/17/01/c01028.

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Abstract X-ray micro-CT has become a popular and widely used tool for the purposes of scientific research. Although the current state-of-the-art micro-CT is on a high technology level, it still has some known limitations. One of the relevant issues is an inability to clearly identify and quantify specific materials. The mentioned drawback can be solved by the energy-sensitive CT approach. Dual-energy CT, which is already frequently used in human medicine, offers the identification of two different materials; for example, it differentiates an intravenous contrast agent from bone or it can indic

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Lee, Ki-Hun, and Bang Chul Jung. "A Novel Expectation-Maximization-Based Blind Receiver for Low-Complexity Uplink STLC-NOMA Systems." Sensors 22, no. 20 (October 21, 2022): 8054. http://dx.doi.org/10.3390/s22208054.

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In this paper, we revisit a two-user space-time line coded uplink non-orthogonal multiple access (STLC-NOMA) system for Internet-of-things (IoT) networks and propose a novel low-complexity STLC-NOMA system. The basic idea is that both IoT devices (stations: STAs) employ amplitude-shift keying (ASK) modulators and align their modulated symbols to in-phase and quadrature axes, respectively, before the STLC encoding. The phase distortion caused by wireless channels becomes compensated at the receiver side with the STLC, and thus each STA’s signals are still aligned on their axes at the access poi

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Brik, Vladimir, Patrick Meade, Gonzalo Merino, Jan Oertlin, David Schultz, and Heath Skarlupka. "IceCube File Catalog." EPJ Web of Conferences 214 (2019): 04055. http://dx.doi.org/10.1051/epjconf/201921404055.

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IceCube is a cubic kilometer neutrino detector located at the south pole. Metadata for files in IceCube have traditionally been handled on an application by application basis, with no user-facing access. There has been no unified view of data files, and users often query the filesystem to locate files. Recently effort has been put into creating a unified view in a central metadata catalog. Going for a simple solution, we created a userfacing REST API backed by a NoSQL database. All major data producers add their metadata to this central catalog. Schema generation is identified as an important

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Isca, Agostino, Nader Alagha, Riccardo Andreotti, and Marco Andrenacci. "Recent Advances in Design and Implementation of Satellite Gateways for Massive Uncoordinated Access Networks." Sensors 22, no. 2 (January 12, 2022): 565. http://dx.doi.org/10.3390/s22020565.

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This paper provides an overview of recent results of a design, development and performance evaluation study of satellite gateways to receive and manage the traffic from a large population of uncoordinated user terminals. In particular, direct satellite access scenarios for machine-to-machine communications and the Internet of Things have been targeted. Tests were carried out in a representative laboratory environment emulating realistic system scenarios. Performance results, as presented in this paper indicate that the proposed gateway architecture, based on an efficient access protocol, is ca

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Lam, Mark H. C., and David A. Jans. "Choosing Between Confocal Microscopes : A Fly-Eye's View." Microscopy Today 8, no. 3 (April 2000): 8–9. http://dx.doi.org/10.1017/s1551929500061022.

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We have recently been shopping for a confocal microscope and have found a simple way to test the capabilities of the various units that have been demonstrated to us. Some of the important aspects that we were looking for in our “ideal” multi-user system were:1)Ease of use.2)The ability to obtain good X-Y, X-Z and hence X-Y-Z resolution, and the accurate display of these images.3)The depth within the sample at which the system can resolve structures (this of course depends mostly on the lenses used), but is still an important criteria as it reflects on the system as a whole.4)“extras” such as a

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Okabe, Satoshi, Michihiro Nagao, Takeshi Karino, Satoshi Watanabe, Tomohiro Adachi, Hirohiko Shimizu, and Mitsuhiro Shibayama. "Upgrade of the 32 m small-angle neutron scattering instrument SANS-U." Journal of Applied Crystallography 38, no. 6 (November 12, 2005): 1035–37. http://dx.doi.org/10.1107/s0021889805029201.

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The small-angle neutron scattering instrument, SANS-U, owned by the Institute for Solid State Physics, The University of Tokyo, has been upgraded. The SANS-U is a 32 m SANS instrument installed in 1991 at the guide hall of the JRR-3M research reactor of the Japan Atomic Energy Research Institute, and has been serving for inter-university cooperative research use since 1993. The major upgrades include (i) replacement of the two-dimensional area detector by a multi-wire type position-sensitive proportional counter, (ii) renewal of the operating system from a VAX and sequencers to an integrated P

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