bluuebunny/crossref_metadata_2025_split huggingface dataset:
On Crossing Numbers of Complete Tripartite and Balanced Complete Multipartite Graphs
Authors: Gethner Ellen , Hogben Leslie , Lidický Bernard , Pfender Florian , Ruiz Amanda , Young Michael 
Published: March 2016

AbstractThe crossing number cr(G) of a graph G is the minimum number of crossings in a drawing of G in the plane with no more than two edges intersecting at any point that is not a vertex. The rectilinear crossing number of G is the minimum number of crossings in a such drawing of G with edges as straight line segments. Zarankiewicz proved in 1952 that . We generalize the upper bound to
urn:x-wiley:03649024:media:jgt22041:jgt22041-math-0004and prove . We also show that for n large enough, and , with the tighter rectilinear lower bound established through the use of flag algebras. A complete multipartite graph is balanced if the partite sets all have the same cardinality. We study asymptotic behavior of the crossing number of the balanced complete r‐partite graph. Richter and Thomassen proved in 1997 that the limit as of over the maximum number of crossings in a drawing of exists and is at most . We define and show that for a fixed r and the balanced complete r‐partite graph, is an upper bound to the limit superior of the crossing number divided by the maximum number of crossings in a drawing.
A novel nonlinear large‐signal statistical model of GaN HEMT used in S‐band power amplifier design and yield estimation
Authors: Chen Zhikai , Xu Yuehang , Wang Changsi , Wen Zhang , Rong Chuicai , Xu Ruimin 
Published: March 2016

SummaryA novel GaN high‐electron mobility transistor (HEMT) nonlinear large‐signal statistical model based on empirical equivalent circuit is proposed in this paper. Thirty‐four GaN HEMTs from 10 batches are measured, and all the parameters of the large‐signal model are extracted by in‐house parameter extraction program. We choose six most sensitive parameters of the drain‐source current model and the gate charge model. The statistical method is modeled by using a symbolic processing method to change the range of the six parameters. The statistical model is implemented in Agilent ADS software for validation. A S‐band GaN HEMT power amplifier is designed by using the established statistical model for demonstration purpose. The results show that good accuracy has been achieved by comparing measured and simulated output power (Pout) and power added efficiency (PAE). So it has been proven that this method is suitable for GaN HEMT power amplifier design and yield estimation. Copyright © 2016 John Wiley & Sons, Ltd.
Livestock Type is More Crucial Than Grazing Intensity: Traditional Cattle and Sheep Grazing in Short‐Grass Steppes
Authors: Tóth Edina , Deák Balázs , Valkó Orsolya , Kelemen András , Miglécz Tamás , Tóthmérész Béla , Török Péter 
Published: March 2016

AbstractIn biodiversity conservation of agriculture‐driven landscapes, grasslands have an outstanding importance; their conservation became a top priority both in research and practice. In many regions, sheep or cattle grazing are the best options for biodiversity conservation. In our study, we compared the effects of cattle and sheep grazing on short‐grass steppe vegetation under various grazing intensities. We tested the following study hypotheses: (i) sheep grazing maintains a lower taxonomic and functional diversity, lower amount of forbs compared with cattle grazing; and (ii) the effects of grazing are highly intensity dependent: the differences detected between cattle and sheep grazing are more pronounced at low grazing intensities than at high ones, because the selectivity of grazing decreases at higher intensities. We found lower taxonomic and functional diversity, and lower cover of forbs in sheep‐grazed steppes compared with cattle‐grazed ones. Grazing intensity had a significant effect only on species richness, while on Shannon diversity and evenness, only livestock type had a significant effect. While most single trait indices were affected by the type of the grazer, significant effect of intensity was detected only in few cases. These findings indicated that the selection of the livestock type is the most crucial in conservation; however, for proper ecosystem functioning and high trait variability, the suitable grazing intensity should also be carefully adjusted. Copyright © 2016 John Wiley & Sons, Ltd.
Research on space target detection ability calculation method and spectral filtering technology in sky‐screen's photoelectric system
Authors: Li Hanshan 
Published: March 2016

ABSTRACTSky‐screen is a photoelectric sensor to detection flying target information in shooting range, to improve the detection ability of sky‐screen in strong background luminance, this article establishes the sky background luminance calculation model and the detection ability calculation model of sky‐screen, researches the space targets characteristics and SNR (signal‐to‐noise ratio) calculation model, analyzes the influence factors of strong background luminance and study different spectral filtering methods to improve the detection performance, discusses the influence factor that sky background luminance change and different layouts of sky‐screen to the detection system of sky‐screen. Through the calculation and experiment analysis, the results of the theoretical calculation and experiment testing on the detection ability of calculation model of sky‐screen are consistent, and the spectral filtering technology can improve the signal‐to‐noise ratio and the space target detection ability effectively in sky‐screen. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1035–1041, 2016
Compact circular patch UWB antenna with WLAN band notch characteristics
Authors: Mishra Gangadhara , Sahu Sudhakar 
Published: March 2016

ABSTRACTThe present study demonstrates the designing and characterization of a circular patch antenna having an impedance bandwidth of 2.4–13.8 GHz with band notch at WLAN operating region. The small size (30 × 40 mm2) and large bandwidth (140.7% fractional band width) makes it suitable for different UWB applications. Different size reduction and matching techniques are used in this model to achieve a better response. The Quarter wave transformer matching technique is used for broad band impedance matching between the radiating circular patch and the 50 ohm source impedance. The simple design and good agreement between the simulation and the experimental results makes the design a suitable candidate for practical applications. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1068–1073, 2016
A 10‐GHz SIWG slot array antenna prototype on FR‐4 substrate
Authors: Silva Igor A. C. , Matos Leni. J. , Pinna Paula A. , Magri Vanessa P. R. , Souza Jorge A. M. , Campos Fabricio P. V. 
Published: March 2016

ABSTRACTA 10‐GHz Substrate Integrate Waveguide (SIWG) slot array antenna prototype assembled on FR‐4 substrate is proposed in this article. Simulations were made for the SIWG slot array antenna and the optimized ones. A pair of each simulated antenna was then manufactured and assembled on a FR‐4 substrate. Results of assembled antennas showed good agreement with the simulated ones, and presents 96° aperture angle with 150 MHz bandwidth in a real indoor environment test set, confirming that the FR‐4 substrate can be used for wide‐band wireless digital communication system at 10GHz frequency. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1059–1065, 2016
The design of a dual band omnidirectional horizontally polarized antenna with arc‐shaped lines and overlapping lines
Authors: Park Jae‐Sung , Choi Hak‐Keun , Oh Jung‐Hun 
Published: March 2016

ABSTRACTThis article proposes a dual‐band horizontally polarized omnidirectional antenna for wireless local area network (WLAN) applications. Typically, multiple elements with different sizes have been combined to create antennas that operate in two separate bands. Unlike such previous attempts, the proposed antenna achieves dual band operations by modifying the form of the feed line. The proposed antenna has a similar structure as the Alford loop antenna, but the existing straight feed lines of the Alford loop antenna are modified to arc‐shaped lines. The arc‐shaped feed lines are then attached to the antenna elements in four different directions. The voltage standing wave ratio (VSWR) of the proposed antenna is <2:1 at the 2.4 (2.4–2.48) and 5 (5.15–5.825) GHz WLAN bands. The gain of the proposed antenna is above 0 dBi at the two bands. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1117–1121, 2016
Analysis of radio frequency power transmission between in/on‐body beam‐reconfigurable antennas in the medradio band
Authors: Kang Seonghun , Thuan Nguyen Van , Won Jung Chang 
Published: March 2016

ABSTRACTThis article presents a performance analysis of beam‐reconfigurable in/on‐body antennas. Both antennas operated within the Medical Device Radio Communications Service band (MedRadio band: 401–406 MHz) and were designed to steer the beam directions. To implement the beam‐steering capability, the two antennas used two artificial switches. The in/on‐body antennas were fabricated on FR‐4 and fabric substrate, respectively. A skin‐mimicking model (εr = 46.74, σ = 0.69 S m−1) was adopted for the simulations and measurements of the two antennas. We performed transmission and reception tests between in/on‐body antennas in an antenna chamber. The test was implemented in various cases, with different antenna distance and angle values. In addition, we compared received power between the calculated results (by virtue of the Friis transmission equation) and the actual measured results, and summarize these findings herein. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1163–1169, 2016; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.29750
Low phase noise frequency tripled microwave signal generation using external optical modulation
Authors: Banerjee Chaudhuri Rangana , Das Barman Abhirup , Bhanja Sukhendu , Majumder Arijit , Kar Subal 
Published: March 2016

ABSTRACTA high purity low phase noise frequency tripled microwave signal at 6 GHz is generated by applying a 2‐GHz electrical drive signal to a quadrature biased Mach Zehnder intensity modulator (MZM). Frequency tripled signal is found advantageous compared to frequency doubled generation in terms of increased dynamic range of input electrical drive power and bias voltage stability of MZM. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1082–1085, 2016
UHF RFID dipole tag with modified multi‐fractal cantor arms for enhanced read range
Authors: Abraham Manju , Aju John K. K. , Jose K. Fijo , Mathew Thomaskutty 
Published: March 2016

ABSTRACTThe design and development of a novel RFID tag, which exhibits enhanced read range for operation at European UHF RFID band (865–867 MHz) are presented. The RFID tag consists of a dipole antenna based on modified multi‐fractal cantor arms with an embedded T‐match network and an RFID chip connected to its terminals. Good impedance matching between the antenna and the chip is achieved by optimizing the iterated function system (IFS) transformation coefficients of the modified multifractal cantor arms and the dimensions of the embedded T‐match. The measured results of the read range for the proposed RFID tag are presented. The proposed RFID tag exhibits excellent read range over the entire elevation angular range and over a wide azimuth angular range. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1173–1175, 2016
Compact tri‐band wide‐slot monopole antenna with dual‐ring resonator for WLAN/WiMAX applications
Authors: Liu Guifeng , Liu Ying , Gong Shuxi 
Published: March 2016

ABSTRACTThis letter presents a wide‐slot monopole antenna loaded with a dual‐ring resonator for triple‐band operation, which can be applied for wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX). Multiband operation is realized by incorporating a fork‐like monopole, a wide slot, as well as a dual‐ring resonator. The desired lower bands of 2.4 GHz WLAN and 2.5 GHz WiMAX operations can be obtained by replacing the traditional ground with a wide‐slot ground. Then, with the addition of the dual‐ring resonator coupled fed by the fork‐like monopole, the middle resonate mode covering 3.5 GHz WiMAX occurs. In addition, an upper operation band, which is generated by the fork‐like monopole, can be further widened by the wide‐slot ground to cover the 5.2/5.8 GHz WLAN and 5.5 GHz WiMAX. A prototype of the proposed antenna with a compact size of 32 × 28 mm2 has been designed, fabricated, and tested. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1097–1101, 2016
A 20.6 dBm K‐band power amplifier with 34.6% PAE in 65 nm CMOS
Authors: Parthasarathy Ananthanarayanan 
Published: March 2016

ABSTRACTThis article presents a fully‐integrated K‐band power amplifier design approach for 5G mmWave applications. The 65nm CMOS‐based power amplifier is operated in class‐J mode, has a two‐stage cascade configuration with appropriate power cells prematch and high gain driver stage which achieves a gain of 18 dB and 20.6 dBm saturated output power (PSAT) with 34.6% power added efficiency (PAE). © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1179–1181, 2016
Dual‐band antenna using a C‐shaped dual‐feed for GPS/WLAN applications
Authors: Seo D. , Lee H. , Jung J. , Sung Y. 
Published: March 2016

ABSTRACTThis letter presents a dual‐band antenna with a C‐shaped dual‐feed structure for the GPS band at 1.575 GHz and the WLAN band at 2.4 GHz. It is composed of a C‐shaped strip‐line for dual‐feed and a rectangular patch radiator with two slits. Dual‐resonance is generated by two slits on the patch. The measured impedance bandwidths of the two operating bands are 3 and 1.49%, respectively. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1207–1211, 2016
Neuropsychiatric manifestations in inflammatory neuropathies: A systematic review
Authors: Rajabally Yusuf A. , Seri Stefano , Cavanna Andrea E. 
Published: March 2016

ABSTRACTWe conducted a systematic literature review on psychological and behavioral comorbidities in patients with inflammatory neuropathies. In Guillain–Barré syndrome (GBS), psychotic symptoms are reported during early stages in 30% of patients. Typical associations include mechanical ventilation, autonomic dysfunction, inability to communicate, and severe weakness. Anxiety and depression are frequent comorbidities. Anxiety may increase post‐hospital admissions and be a predictor of mechanical ventilation. Posttraumatic stress disorder may affect up to 20% of ventilated patients. Sleep disturbances are common in early‐stage GBS, affecting up to 50% of patients. In chronic inflammatory demyelinating polyradiculoneuropathy, memory and quality of sleep may be impaired. An independent link between depression and pretreatment upper limb disability and ascites was reported in POEMS (polyneuropathy, organomegaly, endocrinopathy, M‐protein, skin) syndrome, with an association with early death. Hematological treatment of POEMS appears effective on depression. Published literature on psychological/behavioral manifestations in inflammatory neuropathies remains scarce, and further research is needed. Muscle Nerve 54: 1–8, 2016
Diagnostic yield of cystoscopy in the evaluation of recurrent urinary tract infection in women
Authors: Pagano Matthew J. , Barbalat Yanina , Theofanides Marissa C. , Edokpolo Leonard , James Maxwell B. , Cooper Kimberly L. 
Published: March 2016

AimsDue to a paucity of evidence‐based guidelines, anecdotal practice patterns often dictate clinical management of recurrent urinary tract infection (UTI) in women. Our aim was to identify pathologic findings of the urinary tract through cystoscopy and imaging in women with recurrent UTI, and to determine if specific risk factors are associated with a higher rate of abnormal findings.MethodsIn a single‐institutional cohort, cystoscopy was performed for women with recurrent UTI between 1/2010 and 7/2014. All eligible patients were included in a maintained database and those with gross or microscopic hematuria were excluded. Abdominopelvic imaging was recommended and included in study data when completed. Associations between clinical risk factors (history of renal transplant, urogynecologic surgery, or urolithiasis) and abnormal findings were analyzed by Fisher's exact test.ResultsA total of 163 women (mean age 60.6 years) were included in final analysis. Abdominopelvic imaging was available in 133 (82%) cases. Cystoscopy identified 9 (5.5%) cases of significant clinical findings. Of these only 5 (3.8%) cases were uniquely identified on cystoscopy and missed on imaging modalities. When imaging was normal, cystoscopy was also normal in 94% of cases. The examined clinical risk factors were not associated with higher risk of abnormal cystoscopy (P = 0.49) or imaging (P = 0.42).ConclusionsCystoscopy performed solely for recurrent UTI is low yield in patients with normal imaging studies, but a small number of abnormal findings may be missed by foregoing this element of the patient workup. No studied risk factor was predictive of an abnormal workup. Neurourol. Urodynam. 36:692–696, 2017. © 2016 Wiley Periodicals, Inc.
Convolutions and generalization of logconcavity: Implications and applications
Authors: Alimohammadi Mahdi , Alamatsaz Mohammad Hossein , Cramer Erhard 
Published: March 2016

AbstractAdditive convolution of unimodal and α‐unimodal random variables are known as an old classic problem which has attracted the attention of many authors in theory and applied fields. Another type of convolution, called multiplicative convolution, is rather younger. In this article, we first focus on this newer concept and obtain several useful results in which the most important ones is that if
is logconcave then so are
and
for some suitable increasing functions ϕ. This result contains
and
as two more important special cases. Furthermore, one table including more applied distributions comparing logconcavity of f(x) and
and two comprehensive implications charts are provided. Then, these fundamental results are applied to aging properties, existence of moments and several kinds of ordered random variables. Multiplicative strong unimodality in the discrete case is also introduced and its properties are investigated. In the second part of the article, some refinements are made for additive convolutions. A remaining open problem is completed and a conjecture concerning convolution of discrete α‐unimodal distributions is settled. Then, we shall show that an existing result regarding convolution of symmetric discrete unimodal distributions is not correct and an easy alternative proof is presented. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 109–123, 2016
HHS in type 1 diabetes associated with medication overdose: can counter‐regulatory hormone suppression prevent diabetic ketoacidosis?
Authors: Ghorani E , Evans ML , Simmons D 
Published: March 2016

AbstractIn states of insulopaenic hyperglycaemia, counter‐regulatory hormone (CRH) excess is a driver of ketogenesis and thus diabetic ketoacidosis. We present a case of hyperglycaemic hyperosmolar state in a patient with type 1 diabetes mellitus, associated with a mixed drug overdose including agents with documented CRH suppressive effects. We postulate that the drugs taken in overdose protected against diabetic ketoacidosis, and suggest further investigation of pharmacological therapies aimed at inhibiting CRH responses which may protect against this life‐threatening complication in patients with type 1 diabetes. Copyright © 2016 John Wiley & Sons.
Exceptional integrated vapour transport toward orography: an important precursor to severe floods in Switzerland
Authors: Froidevaux Paul , Martius Olivia 
Published: March 2016

Floods in mountainous regions like the Swiss Alps are still challenging to forecast because they result from very diverse hydrometeorological processes. A better understanding of large‐scale flood precursors is therefore important. In this study the synoptic situations leading to 14 high‐impact floods in Switzerland between 1987 and 2011 are analysed using the ERA‐Interim dataset.In a first step, the flood‐related synoptic flow situations are classified into four categories: (i) atmospheric rivers (ARs) with northwesterly flow associated with floods in northwest Switzerland; (ii) ARs with west to souhwesterly flow associated with floods in northern Switzerland; (iii) pivoting potential vorticity (PV) cut‐offs associated with floods in northeast Switzerland and (iv) PV streamers associated with floods in southern Switzerland. The strong link between ARs and floods in northern Switzerland is demonstrated for the first time. The four synoptic categories are associated with very different flow patterns over Switzerland, but all categories correspond to intense integrated vapour transport (IVT) directed perpendicular to orography.In a second step, the episodes of intense IVT related to the 14 floods are compared to the local climatology in terms of IVT amplitude, direction and duration. Ten of the 14 flood events correspond to exceptionally intense IVT perpendicular to orography. Despite the enormous complexity of the involved hydrometeorological processes, applying four simple thresholds of IVT toward orography at particular grid points of ERA‐Interim allows one to distinguish ten flood events from all non‐flood situations with only six non‐events captured and four missed flood events. The close relationship between large‐scale IVT and highly destructive local flood events shown here motivates the use of IVT information for medium‐range flood warning systems.
Identification of time‐varying OE models in presence of non‐Gaussian noise: Application to pneumatic servo drives
Authors: Stojanovic Vladimir , Nedic Novak 
Published: March 2016

SummaryIntensive research in the field of mathematical modeling of pneumatic servo drives has shown that their mathematical models are nonlinear in which many important details cannot be included in the model. Owing the influence of the combination of heat coefficient, unknown discharge coefficient, and change of temperature, it was supposed that parameters of the pneumatic cylinder are random (stochastic parameters). On the other side, it has been well known that the nonlinear model can be approximated by a linear model with time‐varying parameters. Due to the aforementioned reasons, it can be assumed that the pneumatic cylinder model is a linear stochastic model with variable parameters. In practical conditions, in measurements, there are rare, inconsistent observations with the largest part of population of observations (outliers). Therefore, synthesis of robust algorithms is of primary interest. In this paper, the robust recursive algorithm for output error models with time‐varying parameters is proposed. The convergence property of the proposed robust algorithm is analyzed using the methodology of an associated ordinary differential equation system. Because ad hoc selection of model orders leads to overparameterization or parsimony problem, the robust Akaike's criterion is proposed to overcome these problems. By determining the least favorable probability density for a given class of probability distribution represents a base for design of the robust version of Akaike's criterion. The behavior of the proposed robust identification algorithm is considered through intensive simulations that demonstrate the superiority of the robust algorithm in relation to the linear algorithms (derived under an assumption that the stochastic disturbance has a Gaussian distribution). The good practical values of the proposed robust algorithm to identification of the pneumatic cylinder are illustrated by experimental results. Copyright © 2016 John Wiley & Sons, Ltd.