Miracle-dz/UniFAR-FTUs huggingface dataset:
Frequency tracking control of the WPT system based on fuzzy RBF neural network

With the application of electrical equipment, magnetically coupled resonant (MCR) wireless power transfer (WPT) technology has become an effective means to improve equipment intelligence. The MCR‐WPT system is a loosely coupled system, and the resonant frequency may be split or detuned due to the changes of load or transferring distance, resulting in the system transfer efficiency (TE) greatly reduced. To solve the problems of limited speed and accuracy in the existing frequency tracking methods, this paper analyzes the relation between the detuning rate and the system TE, proposing an adaptive frequency tracking control method based on fuzzy radial basis function neural network control. The neural network outputs proportion–integration–differentiation parameters to adjust the inverter drive circuit, and the frequency of inverter drive circuit is adjusted nonlinearly in real time to ensure the accurate frequency tracking of the MCR‐WPT system. The simulation and experimental results show that the proposed method can enhance the tracking ability of the resonant frequency, and effectively improve the system TE.
Risk Assessment of Cascading Failure Based on Serious Failure Analysis

Based on the theory and methods of early evolution rule of cascading failure, the paper puts forward a kind of cascading failure selection and risk analysis method basing on the system failure severity, which can availably take consideration of the interplay of the before and after fault as well as the cumulative effect between successive failures. IEEE RTS-79 system is taken as an example to illustrate the effectiveness of the algorithm.
Theoretical flowrate characteristics of the conjugated involute internal gear pump

The aim of this article is to study the theoretical flowrate characteristics of the conjugated involute internal gear pump. The conjugated involute internal gear pump has a different internal gear, the profile of which is completely conjugated to that of pinion, from the conventional involute internal gear pump. To describe briefly, the former pump is called ‘conjugated pump’ while the latter pump ‘conventional pump’. This structure makes the conjugated pump have smaller volumes of trapped fluid than the conventional pump, which indicates the conjugated pump has a better flowrate performance. Although there have been numerous investigations into gear pumps, none of them have dealt with the conjugated pumps yet. This article presents a systematic study on the theoretical flowrate characteristics of the conjugated pumps. It is expected to obtain some generalized conclusions to guide the design of internal gear pumps. Firstly, a double envelope concept is applied to derive the mathematical models of the conjugated involute internal gear couple. Next, mesh characteristics of the gear couple, which mainly decide the fluid delivery performance of the pumps, are analyzed. Finally, using a control volume approach, the theoretical flowrate characteristics of the pump under different design parameters of gears are investigated. Results show the conjugated pump has a better performance than the conventional one. To design a conjugated pump with good flowrate characteristics, it’s feasible to choose a proper shifting coefficient, a larger tooth number of the pinion, a smaller tooth number of the internal gear, a larger pressure angle and a larger fillet radius, under the condition that no tooth interference occurs.
Design of a voltage-to-current converting interface for current-mode video signal processing applications

Voltage-to-current converters (VICs) are starting to be extensively used in video speed current-mode analog circuits, especially in A/D converters, as internal building blocks or external interfaces with voltage-mode signals. Despite the important role played by VIC's in video signal processing systems, until now no design examples nor experimental results on video rate VIC's have been reported. The purpose of this paper is to present the design of a newly developed VI converter, suitable for interfacing 8-b current-mode circuits operating at video frequencies with voltage signals. A test circuit has been fabricated in 0.7-/spl mu/m, 5-V single-supply CMOS digital process.
Application of wavelets to analysis and simulation of earthquake motions

A method of applying wavelet transform to earthquake motion analysis is developed from the viewpoint of energy input structures, in which relationships between wavelet coefficients and energy input, namely energy principles in wavelet analysis are derived. By using the principles, time–frequency characteristics of the 1995 Hyogoken-Nanbu earthquake ground motions are analysed and time histories of energy input for various ranges of frequencies and epicentral distances are identified. Furthermore, a technique to simulate earthquake ground accelerations by wavelet inverse transform is developed on the condition that target time-frequency characteristics are specified. Structural responses to the simulated accelerations are compared with the target time–frequency characteristics, which shows satisfactory correlations between wavelet coefficients and energy responses in both time and frequency domains. Copyright © 1999 John Wiley & Sons, Ltd.
An Effective Tabu Search for Vehicle Routing Problem with Pickup and Delivery Service

The vehicle routing problem with delivery and pick-up service was considered in this paper. A tabu search was proposed to determine the optimal set of routes to totally satisfy both the delivery and pick-up demand. Performances are compared with other heuristics appeared in the literature recently by the bench-mark data sets. The computational results show that the proposed approaches produce high quality results within a reasonable computing time.
Novel formulation of efficiency measure for multifilar transformers in generalized multiport configurations of integrated passive devices

This article formulates generalized transformer efficiency associated with the application of above‐IC multifilar transformers to multiport integrated passive devices (IPDs). The formulation derives the power‐loss ratio for a multifilar transformer in a multiport configuration based on a terminated microwave network, leading to the expression of passive efficiency using the concept of power conservation. For demonstration, the S‐parameters for several different types of three‐port transformers have been measured to compute their passive efficiency and, further, predict the minimum available insertion loss of three‐port IPDs such as baluns and combiners that use these three‐port transformers. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:656–661, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26656
Demodulation of complex baseband radar signals for the analysis of multiple narrow spectral lines

This paper proposes a technique for processing signals in which the relevant spectral feature consists of one or more narrow lines which have a nonzero Doppler shift with respect to the reference frequency. The proposed technique consists of applying a second demodulation process to the demodulated signal obtained as the receiver output. The purpose of such a demodulation is to remove the frequency shift between the observed spectral line and the center of the observed spectral band. This way, the selected spectral line is brought to baseband, allowing the study of its envelope as a slowly varying process. One efficient way to perform the second demodulation step is by a digital version of a quadrature demodulator. This idea is translated into an efficient algorithm, employing real multiplications and accumulators. An advantage of such an algorithm is that in order to observe two spectral lines in symmetrical positions with respect to the center frequency, common multiplication and accumulators can be used. A possible simplification of the algorithm is discussed in which sinusoids used for demodulation are replaced by square waves, so that multiplication reduces to a synchronous sign reversal. Possible distorsions due to this simplified algorithm are mentioned. Possible implementations of double demodulation in a digital signal processing system are discussed in the final part of the paper.
Particle swarm optimization of dipole arrays for superior MIMO capacity

The particle swarm optimization (PSO) technique is employed to design MIMO arrays for superior capacity. A channel model based on the method of moments solution of the electric field integral equation is utilized with PSO for arrays of dipole elements. Freestanding and printed dipole arrays are analyzed and optimized. Their adaptive performance in the MIMO channel is compared. Numerical results in the form of mean capacity, including comparisons with genetic algorithm results and measurements, are given. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 333–337, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24027
Development of Game-Based Approach Courseware in Learning Computer System Servicing

The study focused on the rationale use of technology that is widely spreading around the world. Educational technology is significant in the learning and teaching process. The significance of the developed game-based courseware was to provide instruction and self-drill-and-practice to understand the computer system servicing terms and concepts. This interactive courseware is an additional innovation that will significantly help in the learning and teaching process. The conceptual framework of the study used to organize and varied literature which establishes the scope of education and principles of game-based courseware. The researcher utilized a questionnaire as the primary research instrument. The weighted mean and the standard deviation are used to determine the acceptability of the courseware. To adopt the opportunities offered by developed game-based courseware, it is essential to focus on lessons learned in Computer System Servicing. Features such as peer to peer learning and camaraderie between learners and educators have been found significant in traditional lessons and converted to educational games, as modern technologies move into the informative mainstream. Additional research into the effects and development of game-based approach courseware to classify the role of teachers as facilitators in the game-based approach of learning can establish ways to develop and create educational practices that better engage and motivate students.
Shunt-stub Wilkinson power divider for unequal distribution ratio

A novel shunt-stub Wilkinson power divider with uniform impedance line is proposed. Compared with conventional Wilkinson power divider, the output distribution ratio of this novel divider is controlled by the length of shunt stubs. It is quite suitable for unequal power divider, especially for the case of high distribution ratio and large power capability. Explicit deductive equations, equivalent circuit models and design parameters for this novel shunt-stub power divider are derived. Finally, the proposed structure is used to construct three power dividers whose distribution ratio are, respectively, 6:1, 4:1 and equal split. Measured results show good agreements with simulations and denote the applicability in practical engineering.
Design oriented analysis of reactive power in resonant converters

An analysis of reactive (circulating) power and RMS currents in a number of resonant converters is presented. The analyzed converter topologies include the half-bridge zero-current-switching quasi-resonant-converter (HB ZCS-QRC), the half-bridge zero-voltage-switched multiresonant-converter (HB ZVS-MRC), the constant frequency half-bridge zero-voltage-switched multiresonant-converter (CF HB ZVS-MRC), the HB ZVS that uses the magnetizing inductance as a resonant element (HB ZVS-MRC (L/sub M/)), and the full-bridge series-parallel-resonant-converter (FB SPRC). It is shown that the HB ZCS-QRC and the soft-switched HB ZVS-MRC (L/sub M/) circulate relatively small amounts of power. However, the circulating power in the HB ZVS-MRC, CF HB ZVS-MRC, and SPRC is found to be considerably larger. The analysis is used to generate sets of characteristics for each converter that can be used in their design optimization based on the minimization of the circulating power. Several design examples are presented for the HB XVS-MRC and SPRC. >
The effect of COVID‐19 on food sales

Abstract Both COVID‐19 pandemic‐related restrictions and recessionary employment loss severely impacted US food sales during 2020. This article estimates the historical relationship between food expenditures and employment at the county level. Using these estimates, we simulate the impact of the loss of employment on food sales and find that, on average, employment loss increased food‐at‐home (FAH) sales by 1.3% and decreased food‐away‐from‐home (FAFH) sales by 0.5% in 2020. We argue differences to the actual 4.8% increase in FAH sales and 19.5% decrease in FAFH sales in 2020 likely stem from the more drastic COVID‐19 pandemic‐related restrictions and behavioral changes.
Perspectives of low-income mothers about their intimate partner relationships

ABSTRACT To help fill the gaps in their support system and meet the needs of their families, low income mothers may develop or maintain intimate partner relationships (IPRs). This study employs the voices of 22 low-income mothers to examine the factors that influence how low-income mothers’ perceive their intimate partner relationships. Researchers employed a semi-structured interview guide to encourage participants’ reflection about characteristics they seek in an intimate partner, their most recent relationships, and the types of help they want from an intimate partner. A grounded theory approach was used to identify key themes. Identified themes include the impact of participants’ personal history and the centrality of their role as mother. Past experiences of abuse and violence experienced by many low-income mothers made it difficult for them to trust. This research provides insight into the experiences of low-income mothers and IPRs that can be used in future theoretical model development. Practice implications include the need for trauma-informed services and increased social service programs for mothers leaving problematic relationships.
Pengaruh Rekam Medis Elektronik Terhadap Loyalitas Pasien di Tami Dental Care

Masalah kesehatan gigi dan mulut menjadi salah satu masalah kesehatan. Rekam medis memiliki pengaruh yang cukup besar dalam rangka peningkatan mutu pelayanan kesehatan gigi dan mulut. Tujuan penelitian ini untuk mengetahui bagaimana pengaruh kelengkapan rekam medis elektronik terhadap loyalitas pasien di Tami Dental Care. Jenis penelitian merupakan jenis penelitian deksriptif kualitatif. Uji keabsahan data dilakukan dengan triangulasi sumber. Pengumpulan data dilakukan dengan teknik wawancara secara mendalam dengan melibatkan beberapa sudut pandang informan, yaitu dokter, petugas, dan pasien. Hasil penelitian ini menunjukan bahwa rekam medis elektronik berpengaruh terhadap loyalitas pasien di Tami Dental Care. Kebaruan didapat dengan menguji dan menganalisis hubungan rekam medis elektronik dan loyalitas pasien, yang pada penelitian sebelumnya belum pernah diteliti pengaruhnya secara langsung antara rekam medis dan loyalitas pasien.
Synthetic Aperture Metalens

Metalenses are ultrathin optical elements that can focus light using densely arranged subwavelength structures. Due to their minimal form factor, they have been considered promising for imaging applications that require extreme system size, weight, and power, such as in consumer electronics and remote sensing. However, as a major impediment prohibiting the wide adoption of the metalens technology, the aperture size, and consequently the imaging resolution, of a metalens are often limited by lithography processes that are not scalable. Here, we propose to adopt a synthetic aperture approach to alleviate the issue, and experimentally demonstrate that, assisted by computational reconstruction, a synthetic aperture metalens composed of multiple metalenses with relatively small aperture size can achieve an imaging resolution comparable to a conventional lens with an equivalent large aperture. We validate the concept via an outdoor imaging experiment performed with a synthetic aperture metalens-integrated near-infrared camera using natural sunlight for target illumination. © 2021 Chinese Laser Press
IS CUSTOMER SATISFACTION THE CURRENCY OF EXCHANGE IN TODAY'S CLASSROOMS?

This is an Ethnographic analysis that views the classroom as an information system. The general purpose of this project was to identify the causes for differences in view between faculty and student instructor performance assessments. The research was motivated because of the opposition between faculty and student evaluations about an instructor. There is a culture of passive learning that is quietly accompanying the increased emphasis of the “customer focused classroom. ” This focus encourages passive students to ascribe course dissatisfaction to instructor or instructional deficiencies. When an instructor challenges passive learners, they report being dissatisfied customers. How that assessment will be used by umbrella organizations to retain faculty is uncertain. That uncertainty impacts how faculty members evaluate their peers.
Establishment of Reference Intervals For Serum Liver Function Tests Among Healthy Elderly Population In Northeast China: A Retrospective Study

Background: Liver function changes with age, however, there are few studies that are specific for the elderly. This study is aimed to establish reference intervals (RIs) of serum liver function tests among healthy elderly population aged between 60-89 in northeast China.Methods: Subjects were colleted from laboratory information system (LIS) in the First Hospital of Jilin University. The following parameters were collected: aspartate aminotransferase (AST), alanine aminotransferase (ALT), gamma-glutamyltransferase (GGT), alkaline phosphatase (ALP), total protein (TP) albumin (ALB), total bilirubin (TBIL), and direct bilirubin (DBIL). Tukey method was used to eliminate outliers. The Harris and Boyd method and Mann-Whitney U-test were performed to evaluate significant differences between subgroups of sex and age. The lambda-mu-sigma (LMS) method was used to analyze the dynamic changes of analytes. RIs were established by the non-parametric method.Results: A total of 23597 healthy individuals, including 20048 subjects (18-59 years old) and 3549 subjects (60-89 years old) were enrolled in the study. AST, ALT, TP and ALB required no sex partition. Except for AST, ALP and TBIL, ALT, GGT, TP, ALB and DBIL required different levels of age partitions. Serum ALT and ALB levels decreased with age, ALB showed apparent decreases throughout the aging process. DBIL showed an increase trend over time. This study showed different results compared with RIs in other studies.Conclusions: The RIs for liver function tests among healthy elderly population were different from those of other young individuals. There were apparent sex or age differences in the RIs of liver function for the elderly. Therefore, it is necessary to establish sex- and age-specific RIs of serum liver function tests among elderly population.
PREDICTING NOISE-INDUCED HEARING LOSS (NIHL) IN TNB WORKERS USING GDAM ALGORITHM

Noise is a form of a pollutant that is terrorizing the occupational health experts for many decades due to its adverse side-effects on the workers in the industry. Noise- Induced Hearing Loss (NIHL) handicap is one out of many health hazards caused due to excessive exposure to high frequency noise emitted from the machines. A number of studies have been carried-out to find the significant factors involved in causing NIHL in industrial workers using Artificial Neural Networks (ANN). Despite providing useful information on hearing loss, these studies have neglected some important factors. The traditional Back-propagation Neural Network (BPNN) is a supervised Artificial Neural Networks (ANN) algorithm. It is widely used in solving many real time problems in world. But BPNN possesses a problem of slow convergence and network stagnancy. Previously, several modifications were suggested to improve the convergence rate of Gradient Descent Back-propagation algorithm such as careful selection of initial weights and biases, learning rate, momentum, network topology, activation function and ‘gain’ value in the activation function. This research proposed an algorithm for improving the current working performance of Back-propagation algorithm by adaptively changing the momentum value and at the same time keeping the ‘gain’ parameter fixed for all nodes in the neural network. The performance of the proposed method known as ‘Gradient Descent Method with Adaptive Momentum (GDAM)’ is compared with ‘Gradient Descent Method with Adaptive Gain (GDM-AG)’ (Nazri, 2007) and ‘Gradient Descent with Simple Momentum (GDM)’ by performing simulations on classification problems. The results show that GDAM is a better approach than previous methods with an accuracy ratio of 1.0 for classification problems like Thyroid disease, Heart disease, Breast Cancer, Pima Indian Diabetes, Wine Quality, Australian Credit-card approval problem and Mushroom problem. The efficiency of the proposed GDAM is further verified by means of simulations on Noise-Induced Hearing loss (NIHL) audiometric data obtained from Tenaga Nasional Berhad (TNB). The proposed GDAM shows improved prediction results on both ears and will be helpful in improving the declining health condition of industrial workers in Malaysia. At present, only few studies have emerged to predict NIHL using ANN but have failed to achieve high accuracy. The achievements made by GDAM has paved way for indicating NIHL in workers before it becomes severe and cripples him or her for life. GDAM is also helpful in educating the blue collared employees to avoid noisy environments and remedies against exposure to excessive noise can be taken in the future to prevent hearing damage.
Three-phase soft-switched pwm inverter for motor drive application

A novel soft-switched inverter topology in which three mutually coupled inductors at a time are involved in the resonance process is proposed. By the introduction of magnetic coupling between three resonant inductors, the zero-voltage instants for the inverter can be generated by one auxiliary switch. Also, the resonant energy can be recycled, and the maximum voltage stress on the auxiliary circuit diode components is confined to the DC-link clamp voltage level. The DC link can be clamped to 1.1-1.3 times the DC-source value. This is unlike the soft-switched inverter in which two mutually coupled inductors are at a time are involved in a resonance process, wherein the clamping diode experiences voltage stress of the order of 11 per unit when clamping the DC-link voltage at 1.1 per unit. The proposed inverter also provides pulse-width modulated operation. An analysis of this novel quasi-resonant DC-link inverter topology is presented to reveal its soft-switching characteristics. Simulation and laboratory experiments are performed to validate the analysis.