bluuebunny/crossref_metadata_2025_split huggingface dataset:
Deep learning‐based pilot‐assisted channel state estimator for OFDM systems
Authors: Essai Ali Mohamed Hassan 
Published: December 2020

AbstractThis study proposes an online deep learning‐based channel state estimator for OFDM wireless communication systems by employing the deep learning long short‐term memory (LSTM) neural networks. The proposed algorithm is a pilot‐assisted estimator type. The proposed estimator is initially offline trained using simulated data sets, and then it follows the channel statistics in an online deployment, where finally the transmitted data can be recovered. A comparative investigation is performed using three different optimisation algorithms for deep learning to evaluate the performance of the proposed estimator at each. The proposed estimator provides a superior performance in comparison to least square (LS) and minimum mean square error (MMSE) estimators when limited pilots are used, thanks to the outstanding learning and generalisation capabilities of deep learning LSTM neural networks. Also, it does not require any prior knowledge of channel statistics. So, the proposed estimator is promising for channel state estimation in OFDM communication systems.
Experimental validation of a three‐dimensional modulation format for data transmission in RGB visible light communication systems
Authors: Rios Jose L. Henao , González Neil Guerrero , Ribeiro Moisés R. N. , Silva Jair A. L. 
Published: December 2020

AbstractTransmission of three‐dimensional (3D) orthogonal frequency division multiplexing (OFDM) signals over red, green and blue (RGB) visible light communication (VLC) systems is proposed and experimentally validated. The novel 3D modulation format aims to overcome the different luminous response of RGB light‐emitting diodes at the same driving current levels, that generates a correlation among the three RGB analog signals instead of considering each channel as independent from each other, as is in classical uniform wavelength division multiplexing transmissions. In the proposed scheme, real and imaginary parts of OFDM signals are sent through the red and blue channels of the VLC transmitter, respectively, while the third dimension of the OFDM symbol is transmitted through the green channel, according to a procedure that allows the maximisation of the Euclidean distance among the 3D constellation symbols. For the OFDM signal reconstruction and decoding at the receiver side, advanced digital signal processing for frame synchronisation and reconstruction of the 3D constellation diagram are implemented. Experimental results are included to validate the transmission of a 27.3 Mbps system through a VLC link of 1.5 m.
End‐to‐end delay optimisation for IEEE 802.11 string topology multi‐hop wireless networks in overhead transmission line system
Authors: Zhao Chanjuan , Sun Wei , Fang Zhao , Wang Jianping , Li Qiyue , Zhang Haiyan 
Published: December 2020

AbstractThe network sampling rate is important in the overhead transmission line monitoring system. A larger sampling rate can provide more available monitored data to be transmitted, which can effectively improve the response speed to emergency events of the overhead transmission line system. Considering the harsh environment of the overhead transmission line wireless network, quality‐of‐service (QoS) requirement becomes an important issue for multi‐hop transmission. Thus, in this paper, an end‐to‐end delay optimisation algorithm for string‐topology multi‐hop wireless network is proposed, by which the maximum packet arrival rate and the allowable maximum sampling rate of network can be obtained with desirable soft QoS guarantees. Based on the IEEE 802.11 standards and the basic probability theorem, a novel end‐to‐end delay performance analytical model is firstly proposed. Then, combined with the derived analytical model, an end‐to‐end delay optimisation algorithm by maximising the packet arrival rate is developed. Finally, a numerical study of a string‐topology multi‐hop network is presented to verify the effects of packet arrival rate, backoff contention window size, hop number, data packet size on the end‐to‐end delay performance.
Quantised control of delayed Markovian jump systems with partly known transition probabilities
Authors: Yang Ning , Chen Dongyan , Hu Jun 
Published: December 2020

AbstractThis paper is devoted to solve the quantised control problem of the continuous‐time uncertain Markovian jump systems with mixed time delays and partly known transition probabilities. For the Markov chain, the transition rates are assumed to be partly known. The involved mixed time delays comprise both time‐varying delays and distributed delays. The logarithmic quantiser is introduced in the design of the state feedback controller and the uncertainty is entered into the quantization error matrix represented by an interval matrix. Based on the generalised Itô's formula, the free‐connection weighting matrix method and the stochastic analysis theory, several novel sufficient conditions are derived to guarantee that the trivial solution of the closed‐loop system is robustly exponentially stable in the mean square. Then, the concrete expression form of the desired controller gain is obtained via the solutions to a set of linear matrix inequalities. In addition, the corresponding stability criteria are given for three special situations of Markovian jump systems. Finally, a numerical example and a practical example (the wheeled mobile manipulator) are provided to show the feasibility and availability of the proposed theoretical results.
Guaranteed cost stabilization control of discrete‐time switched systems
Authors: Du Shengli , Zhao Xudong , Qiao Junfei , Zong Guangdeng 
Published: December 2020

AbstractThis paper is concerned with the guaranteed cost control problem of a class of linear discrete‐time switched systems with parametric uncertainties. Both state‐based and dynamic output‐based robust stabilization problems are investigated by using mode‐dependent dwell time technique. Different from the existing results, here, the designed controllers are both mode‐dependent and quasi‐time‐dependent, which are less conservative. On the basis of the designed quasi‐time‐dependent Lyapunov functions, robust stabilization criteria are presented for the system under consideration. The solvable conditions are formulated as linear matrix inequalities, which are thus easy to be solved. Some comparative simulations are given to show the effectiveness of the proposed method.
Fixed‐time stabilisation of boundary controlled linear parabolic distributed parameter systems with space‐dependent reactivity
Authors: Bao Chunxia , Cui Baotong , Lou Xuyang , Wu Wei , Zhuang Bo 
Published: December 2020

AbstractThe problems of state feedback and output feedback for fixed‐time stabilisation of a linear parabolic distributed parameter system with space‐dependent reactivity are considered by means of continuous backstepping approach and Lyapunov method. First, the invertible Volterra integral transformation with time dependent gain kernel is adopted to convert the original system into a fixed‐time stable target system with time‐dependent coefficient. The well‐posedness of the resulting kernel equations is proved by the method of successive approximation. Then a state feedback controller is designed to guarantee fixed‐time stabilisation of the closed‐loop system. Moreover, a fixed‐time observer is considered to estimate the state of the original system on the basis of the measurement signal at the boundary. Based on this observer, a observer‐based output feedback controller is established to fixed‐time stabilise the closed‐loop system in a prescribed time by using separation principle. Finally, a numerical simulation is provided to verify the feasibility of the proposed theoretical results by using the modified Ablowitz‐Kruskal‐Ladik scheme.
STCC: A SDN‐oriented TCP congestion control mechanism for datacenter network
Authors: Tianfang Yu , Xuesong Qiu 
Published: December 2020

AbstractDue to characteristics of high bandwidth and low latency, datacenter networks ensure tremendous data could be transmitted in an efficient way. However, in many‐to‐one transmission scenarios, high concurrency of TCP flows aggravates network congestion and causes overflows in switches, seriously impairing network performance. To solve the problem, a TCP congestion control mechanism based on software‐defined networking (STCC) is proposed. Without any modification in TCP stack, STCC monitors network performance through centralized control and global network view of SDN, employs a routing algorithm based on the minimum path bandwidth utilization rate to forward packets and uses different methods to adjust congestion windows of senders so that network congestion can be greatly mitigated. An experiment platform is built to carry out simulation tests for evaluating STCC, and the results show that under the same network conditions, STCC effectively reduces the number of retransmission timeout of senders and noticeably raises network throughput, compared with other congestion control algorithms.
Magnetic measurement of nanocrystalline alloy based on a single sheet tester
Authors: Zhang Xiwei , Li Lin , Zhang Yan , Pang Jian 
Published: December 2020

AbstractGenerally, for the measurement of magnetic characteristics of nanocrystalline alloy, the magnetic circuit length (lm) is assumed as a constant, and magnetic measurement under square waveform is rarely focused. This paper examines that magnetic characteristics of nanocrystalline alloy are measured under sinusoidal waveforms and square waveforms based on a single sheet tester. The factors related to lm are analysed from the tested data under sinusoidal excitations, and a novel method to determine lm is presented, which is then extended to the case under square waveforms. By combining with a power electronic inverter, the influence of power electronic topology on measurements is analysed, and the oscillation mechanism of excitation current of single sheet tester is revealed. As a result, the limitation of the H‐coil method for acquiring the magnetic field intensity H under square waveforms is pointed out, and improved magnetic circuit method is introduced. It is shown from experimental results that the proposed measurement system is useful for acquiring magnetisation characteristics of the nanocrystalline alloy.
Haine et cruauté dans la relation transféro-contre-transférentielle
Authors: Jean-Dit-Pannel Romuald , Thomas François 
Published: December 2020

La relation transféro-contre-transférentielle, véritable outil de travail du caregiver, du soignant, du psychiste, convie à penser la haine et la cruauté. Entre cruauté et tendresse, quelles capacités de re-co-naissances intrapsychiques et intersubjectives le soignant possède-t-il en lui afin de (re)considérer un soigné qui est lui dans un état de dépendance absolue et qui survit somatiquement et psychiquement ?
La cruauté au sein d’une clinique extrême, celle de la clinique de l’insuffisance rénale chronique, est ici précisée, illustrée. Le soigné, pleinement, et le caregiver, à moindre mesure, sont pris, réellement et fantasmatiquement, entre une cruauté hématophile, conséquente de l’oralité vampirique en hémodialyse, et une cruauté anthropophage, issue de l’oralité cannibalique dans la clinique de la greffe rénale.
Une rencontre clinique avec une insuffisante rénale transplantée et les pensées paradoxales qu’elle a fait naître chez l’un d’entre nous affinera notre propos.
Nous discuterons d’une cruauté constituante pour conclure sur le besoin chez tout soignant de penser la haine et la cruauté. Pour nous, cela permet d’être au service de la relation de soin, donc des intrications somatopsychiques, de s’en dégager pour ne pas agir, notamment par retournements actif/passif, cette haine et cette cruauté dans les soins (enjeux de bientraitance/maltraitance ou plutôt de bienveillance/malveillance dans les soins).
Lactate Dehydrogenase Prior to Transarterial Hepatic Chemoperfusion Predicts Survival and Time to Progression in Patients with Uveal Melanoma Liver Metastases
Authors: Ludwig Johannes , Haubold Johannes , Heusner Till-Alexander , Bauer Sebastian , Siveke Jens T. , Richly Heike , Wetter Axel , Umutlu Lale , Theysohn Jens M. 
Published: December 2020

Purpose To assess serum lactate dehydrogenase (LDH) as a pretreatment prognostic factor in patients with uveal melanoma liver metastases treated with transarterial hepatic chemoperfusion (THC).
Materials and Methods 56 patients (48 % male, median age: 63.5 years) underwent a median of 4 THC sessions. Kaplan-Meier for median overall survival (OS) and time to hepatic progression (TTP; 95 %CI) in months and Cox proportional hazards model for uni- (UVA) & multivariate analyses (MVA) for hazard ratio (HR) evaluation were calculated.
Results The median OS was 9.4 months. The pretreatment LDH value before 1st THC was the strongest OS predictor with 19.8 months for normal (≦ 280 units per liter (U/L)), 9.7 for intermediate (> 280–< 1000 U/L), and 3.84 months for high (≧ 1000 U/L) LDH. LDH significantly predicted a median TTP with 8 months, 4 months, and 1 month for normal, intermediate, and high LDH, respectively. UVA revealed intermediate (16.5) and high (77.3) LDH, bilirubin > the upper limit of normal (ULN) (2.89), alkaline phosphatase > 1.5 ULN (6.8), leukocytes > ULN (4.2), gamma-glutamyl transferase (GGT) > ULN (7), extrahepatic metastases (1.8) and liver lesions ≥ 5 cm (3.6) as significant predictors for worse OS. MVA confirmed intermediate (5) and high (27.1) LDH, bilirubin (5.7), GGT (2.9), and tumor size ≥ 5 cm (3.7) as significant independent predictors for worse OS. Patients with decreasing vs. increasing LDH > 10 % between 1st and 2nd THC (median: 38 days) survived longer (14.6 vs. 4.3 months) and progressed later (7 months vs. 1 month).
Conclusion Elevated pretreatment serum LDH is an essential and robust OS and TTP predictor, potentially allowing for the identification of patients benefiting most from transarterial hepatic chemoperfusion.
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Short-term Prophylaxis for Delivery in Pregnant Women with Hereditary Angioedema with Normal C1-Inhibitor
Authors: Moraes Caroline Guth de Freitas Batista de , Mikami Liya Regina , Ferrari Lilian Pereira , Pesquero João Bosco , Chong-Neto Herberto José , Rosario Filho Nelson Augusto 
Published: December 2020

Abstract
Objective To verify the efficacy of short-term prophylaxis for vaginal or cesarean section childbirth with plasma-derived C1-inhibitor concentrate in pregnant women. They should have hereditary angioedema (HAE) and normal plasma C1-inhibitor.
Methods Case report of pregnant women diagnosed with HAE with normal C1-inhibitor who had been treated with intravenous C1-inhibitor concentrate for prophylaxis of angioedema attacks when hospitalized for delivery. The exon 9 of the Factor 12 (F12) genotyping gene was performed by automatic sequencing in all patients.
Results Three cases of pregnant women with HAE with normal serum level of C1-inhibitor are reported. The genetic test detected the presence of a pathogenic mutation in the F12 gene. Deliveries occurred uneventfully and patients had no HAE symptoms in the following 72 hours.
Conclusion C1-inhibitor concentrate could be useful to prevent angioedema attacks during and after delivery.
Sociodemographic and Clinical-pathological Study of Molecular Subtitles of Breast Carcinoma in a Reference Unit of Maranhão
Authors: Reis Ana Paula Almeida Miranda , Teixeira Cecilma Miranda de Sousa , Medeiros Adriano Rêgo Lima de , Chaves Karlla Zolinda Cantão , Albuquerque Camila Rosa de , Melo Mateus Rufino 
Published: December 2020

Abstract
Objective To evaluate the distribution of the main sociodemographic and clinical-pathological characteristics in women with breast cancer according to the molecular profile by immunohistochemistry.
Methods A cross-sectional, retrospective, analytical and quantitative study was performed, with an analysis of 137 medical records from January 2015 to December 2018 of women attending the High Complexity in Oncology Unit of the city of Imperatriz, state of Maranhão, Brazil. The immunohistochemical profile of tumors based on the estrogen and progesterone receptor, Human Epidermal growth factor Receptor-type 2 (HER2) overexpression and Ki67 cell proliferation index was defined, from which six molecular subtypes were determined: luminal A, luminal B-HER2 negative, luminal B-HER2 positive, triple negative, overexpression of HER2 and inconclusive.
Results A total of 52.6% of the patients were postmenopausal, mean age 52.1 years old, brown (56.2%), had a schooling level < 9 years (40%), staging > IIB (52.6%) and 23.4% had metastasis. Invasive ductal carcinoma accounted for 84.7%, tumor size was 2 to 5 cm (48.9%), with lymph node involvement (56.2%), axillary lymphadenectomy in 67.2%, and mastectomy in 73.7% of the patients. The most frequent molecular subtype was the luminal B-HER2 negative (36.5%), and the luminal A subtype showed characteristics of better prognosis when compared with the others.
Conclusion It was concluded that in the association of molecular subtypes with sociodemographic and clinical-pathological characteristics, there were no statistically significant results obtained, except for complementary therapy, referring to hormone therapy, and there was a high index of metastasis at diagnosis, which was a worrying factor and indicative of failures in the screening and early diagnosis of this population.
Update on Thrombocytopenia in Pregnancy
Authors: Subtil Simone Filipa Carrasqueira , Mendes Jorge Miguel Bastos , Areia Ana Luísa Fialho de Amaral , Moura José Paulo Achando Silva 
Published: December 2020

AbstractThrombocytopenia, defined as platelet count < 150,000 mm3, is frequently diagnosed by obstetricians since this parameter is included in routine surveillance during pregnancy, with an incidence of between 7 and 12%. Therefore, decisions regarding subsequent examination and management are primordial. While most of the cases are due to physiological changes, as gestational thrombocytopenia, other causes can be related to severe conditions that can lead to fetal or maternal death. Differentiating these conditions might be challenging: they can be pregnancy-specific (pre-eclampsia/HELLP syndrome [hemolysis, elevated liver enzymes, low platelets]), or not (immune thrombocytopenia purpura, thrombotic thrombocytopenic purpura or hemolytic uremic syndrome). Understanding the mechanisms and recognition of symptoms and signs is essential to decide an adequate line of investigation. The severity of thrombocytopenia, its etiology and gestational age dictates different treatment regimens.
The birds and the Bedes: Race, gender, and sexuality in Bede’s In Cantica Canticorum
Authors: Wade Erik 
Published: December 2020

AbstractThis article argues that Bede – like modern intersectional analysis – believed that identity categories cannot be disentangled or understood in isolation. In Bede’s commentary on the Song of Songs, skin color, gender, and religious identity intermix with metaphors of sexuality. These categories coalesce in a monumental lesson on how to read. Bede claims that reading the Song literally – perceiving Black skin, eroticism, gender confusion – means reading like a Jew and prevents readers from seeing the feminine, metaphorical level below the masculine, carnal level. This article suggests that intersectional analysis is akin to much medieval thought rather than being an anachronistic imposition on a historical text. Intersectional analysis can lay bare how medieval theologians saw identity categories as interwoven and interdependent, even while the theologians themselves entrenched hierarchies of race, gender, sexuality, and religious difference. For Bede, Christian interpretation is a continual process of moving from a literal outside (Black, masculine, carnal, sexual) to a metaphorical inside (beautiful, feminine, allegorical, chaste, reproductive). Once inside, however, we – like the bird passing through the hall – must return once again to the outside in an endless movement between layers that echoes theological processes of rumination and blurs the divide between the contemplative and the active life.
Talking about ‘victims’, ‘survivors’ and ‘battered women’: how labels affect the perception of women who have experienced intimate partner violence (‘Víctimas’, ‘supervivientes’ y ‘mujeres maltratadas’: cómo influyen las etiquetas en la percepción de las mujeres que han sufrido violencia por parte de sus parejas)
Authors: Romero-Sánchez Mónica , Skowronski Marika , Bohner Gerd , Megías Jesús L. 
Published: December 2020

Two studies addressed effects of the labels ‘victim’, ‘battered woman’ and ‘survivor’ on the perception of women who have experienced intimate partner violence (IPV). Spanish undergraduates provided free associations (Study 1; N = 54) and completed semantic differentials (Study 2; N = 142) regarding the labels. Results showed that the term ‘survivor’ evoked more positive associations and ratings than both ‘victim’ and ‘battered woman’, which did not differ from each other. At the same time, however, when asked directly, participants rated ‘survivor’ as the least appropriate term. These seemingly opposing findings replicate research on the terms’ use in sexual aggression. Results were independent of individuals’ acceptance of myths about IPV or knowing a woman who has experienced IPV. Implications for the use of specific language when communicating about IPV are discussed.
Integrated Low Noise Amplifier with Capacitive Shunt Feedback Impedance Matching for Radio Astronomy
Authors: Bimana Abadahigwa , Sinha Saurabh 
Published: December 2020

Abstract
The noise performance of integrated low noise amplifiers (LNAs) is impaired by on-chip inductors owing to their low-quality factor, especially when inductors are used in the signal path at the input, such as for the inductively degenerated common-emitter amplifier. The inductively degenerated common-emitter configuration is largely used in LNA design, owing mainly to its ability to achieve impedance and noise matching simultaneously. This paper proposes an LNA configuration that achieves impedance matching and noise matching simultaneously without an inductor in the input signal path, owing to capacitive feedback and transistor sizing. Only the resistive component of the optimum noise resistance is matched to the source resistance. The impact of the mismatch due to the reactive component to the noise figure is reduced by the ratio G

s
/R

n
. A technique initially developed for the broadband matching of a single-layer microstrip patch antenna is used for the output matching network. Using a 130 nm silicon–germanium heterojunction bipolar transistor process, simulation results indicate a noise figure of 2.3 dB, a gain of 26 dB and S
11 and S
22 that are better than −12 dB at 1.42 GHz. This frequency corresponds to the 21 cm hydrogen line. This novel multi-stage LNA can be used for the detection of electromagnetic radiation from neutral hydrogen atoms from space in radio astronomy and the proposed design methodology can be generalized to LNAs.
Realizing high efficiency 532 nm laser by optimizing the mode- and impedance-matching
Authors: Yao Wenxiu , Wang Qingwei , Tian Long , Li Ruixin , Shi Shaoping , Wang Jinrong , Wang Yajun , Zheng Yaohui 
Published: December 2020

Abstract
Increasing the conversion efficiency of second harmonic generation (SHG) is an area of interest in research. We report a high-efficiency 532 nm laser generation, with a conversion efficiency of 94.04 ± 0.115% from the pump depletion of 98.1% ± 0.1%, by accurately quantifying the round-trip loss and the transmissivity of the input mirror using our proposed scheme. The optimal conversion efficiency of the cavity-enhanced frequency doubling process is independent of the waist and is determined by the pump depletion, round-trip loss, and transmissivity of the input mirror. These results show that the cavity-enhanced frequency doubling process is not necessary to set the focusing parameter at the optimal single-pass conversion. These results provide a guide for future research on high-efficiency SHG.