Miracle-dz/UniFAR-FTUs huggingface dataset:
Propagation modelling for indoor optical wireless communications using fast multi-receiver channel estimation

An iterative site-based method is described for estimating the impulse response of optical wireless channels. The method allows for the simultaneous evaluation of channels for many receiver or transmitter locations, thus providing significantly improved calculation times. A simple geometrical model of indoor environments is presented which includes interior features such as partitions, people, and furniture, thus permitting accurate evaluation of shadowing effects. It is demonstrated that by considering multiple receiver or transmitter locations, it is possible to improve calculation times by a factor of more than a thousand. The tool is applied to the problem of developing propagation models for randomly oriented transmitters and receivers inside rooms. The study shows channel gain variations at a fixed transmitter/receiver separation of more than 20 dB. At large separations, receivers with LOS paths to the transmitters receive on average 5 dB more power than those with no LOS. The authors also show average RMS delay spreads increasing with distance and ranging from 3 to 9 ns for non-LOS channels and up to 4 ns for LOS channels. Finally, in furnished rooms it is shown that accurate estimation of channel parameters requires calculation of at least four-bounce impulse responses.
Computer-Aided Design of a Brushless DC Motor with Exterior-Rotor Configuration

AbstractThe aim of this paper is to evaluate the magnetic field and motor performance of an exterior-rotor brushless DC (BLDC) motor based on two approaches, i.e., the magnetic circuit method and the finite-element analysis (FEA). An equivalent magnetic circuit model is applied to analytically estimate the magnetic field of a BLDC motor, while the validity is verified by the two-dimensional FEA. Due to the restriction of the simplified mathematical model, the FEA is further employed to be an assistant tool for the detailed design of the pole shoe of this BLDC motor. Four design cases with different pole shoe dimensions are proposed, and the one that possesses the largest electromagnetic torque as well as the smallest cogging torque and torque ripple is further prototyped for electric bicycle applications.
Research on the Application of Agent in Personalized Information Recommendation System

In daily life, we rely on other people's suggestions or by word of mouth or recommendation letters and book reviews printed in newspapers and general surveys, such as restaurant guides. However, the Internet's explosive growth has brought us information that anyone can be greatly difficult to digest. To cope with the flood of information, the personalized recommendation systems have been established to assist and complement the natural social process. These systems recommend users to select information that users may be interested in and filter out which users may not be interested. In order to alleviate the information overload problem, the author researches on the application of agent in personalized information recommendation system. The system collects user information of interest through the agent systems and queries the resources to filter and remove information that users do not need. It can provide users with intelligent and active information services.
Rear Interface Engineering to Suppress Migration of Iodide Ions for Efficient Perovskite Solar Cells with Minimized Hysteresis

Accurate interface engineering can effectively inhibit iodide ion migration, thereby improving the stability and photovoltaic performance of perovskite solar cells (PvSCs). The time‐of‐flight secondary‐ion mass spectrometry reveals that in an aged n–i–p‐type PvSC, the iodide ions will move toward the rear side and enter the FTO cathode. In this regard, the authors describe a simple thermal evaporation strategy for introducing an NdCl3 interface layer (NdCl3‐IL) at the rear interface of perovskites to interdict the iodine ion migration pathway, leading to reduced trap densities throughout the whole perovskite region. As a result, a boosted open‐circuit voltage (VOC) is achieved, resulting in power conversion efficiency (PCE) up to 22.16% with negligible hysteresis. The NdCl3‐IL also enhances the device stability, maintaining 83% of initial PCE after the maximum‐power‐point tracking test for 100 h. More encouragingly, a certified PCE of 21.68% is demonstrated on a large‐area (1 cm2) device with combined 2D/3D passivation strategies.
Brain Activity Recognition Method Based on Attention-Based RNN Mode

Brain activity recognition based on electroencephalography (EEG) marks a major research orientation in intelligent medicine, especially in human intention prediction, human–computer control and neurological diagnosis. The literature research mainly focuses on the recognition of single-person binary brain activity, which is limited in the more extensive and complex scenarios. Therefore, brain activity recognition in multiperson and multi-objective scenarios has aroused increasingly more attention. Another challenge is the reduction of recognition accuracy caused by the interface of external noise as well as EEG’s low signal-to-noise ratio. In addition, traditional EEG feature analysis proves to be time-intensive and it relies heavily on mature experience. The paper proposes a novel EEG recognition method to address the above issues. The basic feature of EEG is first analyzed according to the band of EEG. The attention-based RNN model is then adopted to eliminate the interference to achieve the purpose of automatic recognition of the original EEG signal. Finally, we evaluate the proposed method with public and local data sets of EEG and perform lots of tests to investigate how factors affect the results of recognition. As shown by the test results, compared with some typical EEG recognition methods, the proposed method owns better recognition accuracy and suitability in multi-objective task scenarios.
Nonlinear structural system identification using shaking table test data of five-story model building

The purpose of this paper is to develop an application implementable to a laptop computer by which we can evaluate a structural system from its responses in situ. To show applicability of the application, we analyze the data obtained by a shaking table experiment of a five-story building model. Four Lead Rubber Bearings (LRBs) are placed at the four corner of 1st and 3rd stories of the model building instead of columns to set a clear nonlinear behavior of the structure. Using the test data and the developed application, we identify the dynamic characteristics of five-story building model.
Standard Platform for Benchmarking Multidisciplinary Design Analysis and Optimization Architectures

The multidisciplinary design analysis and optimization community has developed a multitude of algorithms and techniques, called architectures, for performing optimizations on complex engineering systems that involve coupling between multiple discipline analyses. These architectures seek to efficiently handle optimizations with computationally expensive analyses including multiple disciplines. A new testing procedure is proposed that can provide a quantitative and qualitative means of comparison among architectures. The proposed test procedure is implemented within the open-source framework, OpenMDAO, and comparative results are presented for five well-known architectures: multiple design feasible, individual design feasible, collaborative optimization, bilevel integrated systems synthesis, and bilevel integrated systems synthesis 2000. How using open-source software development methods can allow the multidisciplinary design analysis and optimization community to submit new problems and architectures to ke.
A uniplanar wideband loop‐antenna design using an alternate inverted 2D cantor set sequence

In this paper a uniplanar wideband loop antenna is presented. The proposed antenna utilizes an inverted Cantor set matrix sequence of thinning and filling, taken by turns. With a 50Ω microstrip feed, an impedance bandwidth of 2–20 GHz (VSWR < 2.5) is obtained. The experimental results of return loss and radiation patterns are presented. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 437–439, 2003
Tracking Time-Varying Powerline Interference in Electrocardiogram Using Robust Extended Kalman Filter

Powerline interference (PLI) often exhibits variations in frequency and amplitude, whose frequency lies in the spectrum range of the ECG signal. Most previous attempts of tracking time-varying PLI signal are based on Least Squared (LS) algorithm. This makes their methods susceptible to QRS complex in tracking low-level PLI signal. This study presents a new robust Kalman filter-based PLI suppressor to overcome the limitation of existing methods. M-estimation is incorporated into the kalman filter to combat the adverse effect of QRS impulsive. Simulation results indicate that our method outperforms the former LS-based PLI cancellers in both suppressing interference and preserving meaningful ECG components at various interference levels.
Hybrid Multiagent Collaboration for Time-Critical Tasks: A Mathematical Model and Heuristic Approach

Principal–assistant agent teams are often employed to solve tasks in multiagent collaboration systems. Assistant agents attached to the principal agents are more flexible for task execution and can assist them to complete tasks with complex constraints. However, how to employ principal–assistant agent teams to execute time-critical tasks considering the dependency between agents and the constraints among tasks is still a challenge so far. In this paper, we investigate the principal–assistant collaboration problem with deadlines, which is to allocate tasks to suitable principal–assistant teams and construct routes satisfying the temporal constraints. Two cases are considered in this paper, including single principal–assistant teams and multiple principal–assistant teams. The former is formally formulated in an arc-based integer linear programming model. We develop a hybrid combination algorithm for adapting larger scales, the idea of which is to find an optimal combination of partial routes generated by heuristic methods. The latter is defined in a path-based integer linear programming model, and a branch-and-price-based (BP-based) algorithm is proposed that introduces the number of assistant-accessible tasks surrounding a task to guide the route construction. Experimental results validate that the hybrid combination algorithm and the BP-based algorithm are superior to the benchmarks in terms of the number of served tasks and the running time.
The Six Sigma handbook : a complete guide for green belts, black belts, and managers at all levels

"The Six Sigma Handbook" is designed for the manager or quality professional who is already familiar with Six Sigma and wants a comprehensive, 700-page guide to the quality tools and statistics that are the foundation for Six Sigma. In addition to providing an overview of the management goals, training issues involved in a Six Sigma implementation, and the underlying philosophy, the book explains in detail (700 pages) the problem-solving techniques and statistical tools most often used in Six Sigma.
Small‐Size Planar LTE/WWAN Antenna and Antenna Array Formed by the Same for Tablet Computer Application

For eight‐band LTE/WWAN operation (704–960/1710–2690 MHz) in the Ultrabook or thin‐profile tablet computer, a planar antenna of simple structure and small size is presented. The proposed antenna is obtained by modifying a simple planar inverted‐F antenna and can be printed on one surface of a thin FR4 substrate of size 10 × 45 mm2 only. The antenna's lower band bandwidth is greatly widened by embedding a proper chip capacitor of 2.7 pF at the feeding strip. This chip capacitor combines with the antenna's shorting strip can control the excitation of a parallel resonance to modify the impedance matching of the antenna's lower band such that a widened bandwidth is easily obtained to cover the LTE700/GSM850/900 operation. Conversely, the antenna's upper‐band bandwidth is also greatly enhanced by using a coupled section in the antenna's radiating strip and adding a parasitic shorted strip near the feeding strip, which lead to multiple resonant modes excited to form a wide bandwidth (>1 GHz) to cover the GSM1800/1900/UMTS/LTE2300/2500 operation. Owing to its small size and simple structure, the proposed antenna is very suitable to be applied in achieving an antenna array with high isolation for MIMO or dual talk (dual WWAN) operation. Promising high‐isolation antenna arrays formed by the proposed antennas are presented. The obtained isolation between the antennas in the antenna array is better than 12 dB, and the envelope correlation coefficient is less than 0.15 for frequencies over the LTE/WWAN bands. Details of the proposed antenna and antenna array are presented. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:1928–1934, 2013
The Mediating Effect of Brand Equity on the Relationship Between Perceived Quality of Care and Loyalty of Customers Towards the Lady Ridgeway Hospital for Children, Colombo

As it is known in the competitive health care Industry, the impact of Perceived quality of care on the attitudes and behavior of visit and re-visit intention of the customers towards hospitals is becoming an important issue. The aim of this study is to examine the relationship between Perceived Quality of Care and Customer Loyalty and how Brand Equity affects the association of perceived quality with Patients Loyalty. For this purpose, data was collected from 196 respondents who sought inward care from the Lady Ridgeway Hospital for Children, Colombo. The study revealed that customers from all social layers seek care at the Lady Ridgeway Hospital. In addition, the findings reflected that Perceived Quality of Care has a positive effect on the Patients Loyalty towards the hospital, the hospital has a good Brand image, and it plays mediating role in this relationship. Patients Loyalty mainly depends on the qualitative aspects of the services provided and not on the socio-economic factors of the patients. Results imply that the Perceived Quality of Care received by the patients lead to build up Brand Equity towards the hospital which in turn leads to Patients Loyalty towards Lady Ridgeway Hospital for Children, Colombo.
Cue the Doctor: An Online Experiment to Understand the Factors Affecting Physician Credibility on Twitter When Sharing Health Information (Preprint)

BACKGROUND Largely absent from research on how users appraise the credibility of professionals as sources for the information they find on social media is work investigating factors shaping credibility within a specific profession, such as physicians. OBJECTIVE We address debates about how physicians should use social media by comparing how a formal and casual appearance on a profile picture influences their credibility. Using prominence-interpretation theory, we posit an effect of a formal appearance on credibility conditional users’ social context, specifically whether they have a regular health care provider. METHODS For this experiment, we recruited 205 social media users using Amazon.com’s Mechanical Turk. We asked participants if they had a regular health care provider and then randomly assigned them to read one of three Twitter posts that varied only in the profile picture of the physician offering health advice. Next, we tasked participants with assessing the credibility of the physician and their likelihood of engaging with the tweet and the physician on Twitter. We used path analysis to assess whether participants having a regular health care provider impacted how the profile picture affected their ratings of physician’s credibility and their likelihood to engage with the tweet and physician on Twitter. RESULTS We found that the profile picture of a physician posting health advice in either formal or casual attire did not elicit significant differences in credibility, with ratings comparable to having no profile image. Among participants assigned the formal appearance condition, those with a regular provider rated the physician higher on a credibility than those without, which led to stronger intentions to engage with the tweet and physician. CONCLUSIONS The findings add to existing research by showing how the social context of information seeking on social media shapes the credibility of a specific professional. Practical implications for professionals engaging with the public on social media and combating false information include moving past debates about casual versus formal appearances and toward identifying ways to segment audiences.
Millimeter-Wave Waveguide-to-Microstrip Inline Transition Using a Wedge-Waveguide Iris

A novel waveguide-to-microstrip inline transition was proposed using a wedge-waveguide iris to form an ultra-compact U-bend waveguide. The wedge-waveguide iris not only functioned as a wide wall of the height-reduced waveguide for the <inline-formula> <tex-math notation="LaTeX">$E$ </tex-math></inline-formula>-plane probe, but also played a critical role in impedance matching and parasitic resonance suppression. The working principle was investigated through theoretical analysis and full-wave simulation, and the relevant design processes for the transition were discussed. Moreover, two back-to-back transition prototypes, one working at the <inline-formula> <tex-math notation="LaTeX">$W$ </tex-math></inline-formula>-band and the other working at the WR4.3 band, were designed, fabricated, and measured. The back-to-back prototypes obtained an insertion loss of less than 0.8 and 1.2 dB, with a return loss better than 15 dB in the <inline-formula> <tex-math notation="LaTeX">$W$ </tex-math></inline-formula>-band and WR4.3 band, respectively. The measurement results were consistent with simulation results. A miniaturized 110-GHz tripler incorporating this transition for inline output was fabricated. A conversion efficiency of 2.5%–3.6% was achieved in 90–120 GHz at 100-mW driving power.
The Evolutionary Pattern of Language in English Fiction Over the Last Two Centuries: Insights From Linguistic Concreteness and Imageability

Fiction has come to play an essential part in human culture and life in recent centuries. Because of its importance, the language or discourse of fiction has been widely studied. Discerning the evolutionary pattern of language in fiction is greatly helpful in understanding the changes in human culture and society. However, most previous studies on literary language that made use of quantitative or computational methods restricted themselves to a few authors or groups and only took into account a relative short span of time. Furthermore, most of the quantitative analysis therein was based on a primary and rather primitive algorithm that summarizes the frequencies of linguistic units in corpora. To overcome these limitations, this study uses semantic similarity as computed by semi-supervised methods to examine diachronic changes. In this study, the three large-scale corpora representing the English language and English fiction were used to investigate the evolutionary patterns concerning diachronic concreteness/imageability. The data from the two measures are well mapped and shown to support the argument that English fiction, as a special genre, exhibits an evolutionary tendency toward increasing concreteness/imageability. This indicates that modern fiction may have become increasingly important in human society, but easier to read and process in words than 19th century English fiction. This study proposed that learnability, genre difference, the changes of population size, and the other factors might have caused the systemic change. The current study is thus an important contribution to understanding the evolutionary trend of language in fiction as well as understanding the development of the English language as a whole. This study creates a novel quantitative methodology and applies this to the examination of diachronic changes of language in literary works.
Linking host plants to damage types in the fossil record of insect herbivory

Abstract. Studies of insect herbivory on fossilized leaves tend to focus on a few, relatively simple metrics that are agnostic to the distribution of insect damage types among host plants. More complex metrics that link particular damage types to particular host plants have the potential to address additional ecological questions, but such metrics can be biased by sampling incompleteness due to the difficulty of distinguishing the true absence of a particular interaction from the failure to detect it—a challenge that has been raised in the ecological literature. We evaluate a range of methods for characterizing the relationships between damage types and host plants by performing resampling and subsampling exercises on a variety of datasets. We found that the components of beta diversity provide a more valid, reliable, and interpretable method for comparing component communities than do bipartite network metrics and that the rarefaction of interactions represent a valid, reliable, and interpretable method for comparing compound communities. Both beta diversity and rarefaction of interactions avoid the potential pitfalls of multiple comparisons. Finally, we found that the host specificity of individual damage types is challenging to assess. Whereas bipartite network metrics are sufficiently biased by sampling incompleteness to be inappropriate for fossil herbivory data, alternatives exist that are perfectly suitable for fossil datasets with sufficient sample coverage.
Correlation of Triglyceride with Coronary Artery Disease Severity in Pre-Diabetic Chronic Stable Angina Patients

Background: Individuals with prediabetes have multiple disturbances in lipoprotein metabolism resulting from multiple combinations of insulin deficiency, insulin resistance and hyperglycemia. Dyslipidemia is the commonest complication of prediabetes and diabetes, and it predispose to premature atherosclerosis causing cardiovascular complication. The aim of this study was to assess correlation of triglyceride (TG) with coronary artery disease (CAD) severity in pre-diabetic chronic stable angina patients. Methods: Our cross-sectional observational study was conducted on 100 pre-diabetic patients (HbA1c 5.7% to 6.4%) with different levels of TG and stable CAD, referred to Tanta university hospitals. Each patient had been subjected to adequate history taking, complete clinical examination and laboratory investigations and electrocardiogram with transthoracic echocardiography. SYNTAX score was calculated. Results: There were significant positive correlations between TG and LDL, ratio and TLC respectively while there was a significant negative correlation between TG and HDL. There was significant positive correlation between SYNTAX and LDL, ratio and urea respectively while there was high significant negative correlation between TG and HDL. TG level was significantly higher in male than female (p= 0.028). There was no significant difference in SYNTAX regarding gender. For the multivariate analysis, only LDL was a significant independent predictor for CAD. Conclusions: There was a positive correlation between the TG and the severity of coronary lesions in pre-diabetic stable angina pectoris patients.