Miracle-dz/UniFAR-FTUs huggingface dataset:
VATE: a trade-off between memory and preserving time for high accuracy cardinalities estimation under sliding time window

Host cardinality is one of the important attributes in the field of network research. The cardinality estimation under sliding time window has become a research hotspot in recent years because of its high accuracy and small delay. This kind of algorithms preserve the time information of sliding time window by introducing more powerful counters. The more counters used in these algorithms, the higher the estimation accuracy of these algorithms. However, the available number of sliding counters is limited due to their large memory footprint or long state-maintenance time. To solve this problem, a new sliding counter, asynchronous timestamp (AT), is designed in this paper which has the advantages of less memory consumption and low state-maintenance time. AT can replace counters in existing algorithms. On the same device, more AT can be used to achieve higher accuracy. Based on AT, this paper designs a new multi-hosts cardinalities estimation algorithm VATE. VATE is also a parallel algorithm that can be deployed on GPU. With the parallel processing capability of GPU, VATE can estimate cardinalities of hosts in a 40 Gb/s high-speed network in real time at the time granularity of 1 second.
Arabic Language Teachers’ Engagement with Published Educational Research in Kuwait’s Secondary Schools

This study investigates Arabic language teachers’ engagement with published educational research in Kuwait’s secondary schools. The study employs 170 participants across six educational regions in the country by using a quota sampling strategy. It used a questionnaire in eliciting their engagement with published educational research. The data were analysed by using simple percentage to describe the scenarios of their engagement with the published educational research. The results show that there is a lack of encouragement and support by their institutions in relation to teachers’ engagement with published educational research. It also indicates that the findings of the study do not relate to their practical teaching. This study recommends that there should be raising of awareness of the teachers on the importance of published educational research. Researchers should be cognizant of the needs of teachers and important roles that teachers could play in the implementation of the findings of the research. It also suggests the development of teachers’ capacity-building such as teachers’ research literacy. This could assist teachers to develop their reading and writing, as well as engaging with published educational research. Again, the study advocates the development of organisational cultures which could support teachers’ engagement with research. This might help in developing teachers’ professional development in relation to their engagement with published educational research.
Analytical and FEM Based Calculation of Electromagnetic Forces Exerted on Cylindrical Coils due to their own Current

─ Different parts of the cylindrical coils are exposed to electromagnetic forces due to electric current flowing through it. These forces can deform the coil in axial and radial directions in abnormal operating conditions. So, in design process of cylindrical coils in many magnetic devices, mechanical stresses exerted on different parts of these kinds of coils should be determined. In this paper, analytical expressions for the forces in axial direction are derived in order to calculate the forces exerted on different parts of the cylindrical coils. In order to evaluate the precision of the method, the finite element method (FEM) is used and the results obtained by FEM are compared with the results of the analytical equations. Results obtained by finite element analysis confirm the analytical method. Due to inherent difficulties in calculation of the forces in radial direction, distribution of the latter on the coil body is calculated by FEM. The results show that the outer turns of the coil in two axial ends are exposed to the largest axial tension, while radial stresses are largest in the middle parts of the coil. In this paper, the calculations focus on the cylindrical coils; however, the method can be used for the calculation of the magnetic force distribution on different parts of spiral coils, disc coils and any type of air-cored coils with different sizes. Index Terms ─ Analytical method, cylindrical coil, electromagnetic force distribution, FEM.
Identify and evaluate factors affecting non-oil exports using FGDM

Economic development is one of the main objectives of every society in the world and economic growth is fundamental to economic development. Nowadays, the international trade policy is deemed as a key strategy in most countries, in such a manner that the process moves forward with a speed more than production growth of the goods and services rendered in developed countries. Non-oil export growth is one of the effective factors in the development of the country's economy. The aim of this study is to evaluating the effective factors on non-oil exports, using fuzzy multi criteria decision making. We contribute non-oil exports literature by identify and evaluate seven critical factors. The findings show that foreign direct investment, technology and quality of products are the most important factors that have significant impact on non-oil exports.
Drivers of economic growth in Ethiopia: Does foreign aid and policy complementarity matter?

The main research question here is to address drivers of economic growth in Ethiopia using the time series data from 1970 to 2016 where the complementarity of aid and policy index is critically assessed. The empirical result from cointegration test confirms the existence of long run relationship among the variables entered in the per capita growth equation. In the long run, foreign aid inflow entered alone has a positive and significant impact on economic growth. Again, aid interacted with policy appears to have a positive contribution showing that both aid and policy are complementary to each other. The results of the study calls for devising policies for checking the apparent link and dynamics between population growth and economic growth, capacitating and maintaining institutional qualities, and proper allocation of financial and infrastructural resources to enhance human capital, comprehensible selection and priority for productive public investment for foreign aid to be more effective, putting more efforts to achieve macroeconomic stabilities via use of prudent fiscal, monetary and trade polices used in amalgamations to complement both aid and policy. Key words: Economic growth, policy index, foreign aid.
Variable cognitive benefits in HAART-treated patients: are aging and low cholesterol linked?

1Department of Health Promotion and Disease Prevention, Robert Stempel College of Public Health and Social Work and College of Medicine, Florida International University, Miami, FL, USA; 2Departments of Psychiatry and Behavioral Sciences, 3Epidemiology and Public Health, and 4Radiology, University of Miami Miller School of Medicine, Miami, FL, USA; 5Department of Psychiatry and Behavioral Neurosciences at CedarsSinai Medical Center and Department of Psychiatry and Biobehavioral Sciences, David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, CA, USA
Efficient Lattice Method for Valuing of Options with Barrier in a Regime Switching Model

We propose an efficient lattice method for valuation of options with barrier in a regime switching model. Specifically, we extend the trinomial tree method of Yuen and Yang (2010) by calculating the local average of prices near a node of the lattice. The proposed method reduces oscillations of the lattice method for pricing barrier options and improves the convergence speed. Finally, computational results for the valuation of options with barrier show that the proposed method with interpolation is more efficient than the other tree methods.
ÉPOCA DE CORTE Y COMPOSICIÓN NUTRICIONAL, SITIO Y GRADO DE DIGESTIÓN DE BALLICO ANUAL (Lolium multiflorum) EN NOVILLOS HARVESTING DATE, NUTRIENT COMPOSITION, SITE AND EXTENT OF DIGESTION OF ANNUAL RYEGRASS (Lolium multiflorum) IN STEERS

Daily gain and feed conversion of steers decreases as ryegrass (Lolium multiflorum) development increases. Therefore, an experiment with three Angus steers (190 kg average initial weight), adapted with cannulas in rumen and proximal duodenum, was conducted to evaluate the effect of ryegrass harvesting stage on nutrient composition, and digestion characteristics. Forage from a commercial prairie, seeded the last week of October, and cut 98 (early), 133 (intermediate) and 171 days (late) after seeding was used. Forage from intermediate and late cuts was regrowth of the previous cuts. Forage from each cut was offered as hay to individually penned steers during two consecutive 14-d periods, according to a repeated measures design with a split plot structure. Forage composition was analyzed, and site and extent of digestion were measured for each cut. Later forage cuts reduced CP and energy content, but increased NDF, ADF, intake and duodenal flow of DM and NDF (p 0.10), but CP flow to duodenum was higher (p<0.01) whereas ruminal degradability, post-ruminal and total digestibility of DM, OM, CP and NDF were reduced (p<0.01) in forages of intermediate and late cuts as compared with the first one. The expected daily gain of Angus steers consuming ryegrass was markedly lower than their growth potential. These results indicate that annual ryegrass is limiting in: a) energy on each cut; b) escape protein in early cut; and c) total protein in intermediate and late cuts.
SMALL SCALE LASER-TRIGGERED ELECTRICAL DISCHARGES AND THEIR APPLICATION TO CHARACTERIZATION OF PLASMA CHANNEL INDUCED BY LIGHT FILAMENTS

Since the first demonstration of laser-induced electrical discharge [1] control of laser-triggered lightning discharges for lightning protection has became a long pursued task holding a great potential for practical applications [2–4]. Instead of high-energy continuouswave lasers such as CO2, emitting in the far infrared, the ultrashort pulse lasers with much shorter wavelengths (from near-infrared to ultraviolet) have been proven to be more advantageous offering a possibility to obtain continuous long ionized channels from the light filaments [5, 6]. It is well known that when a femtosecond laser pulse with power above the critical power for self-focusing propagates in the atmosphere, it forms a long white-light filament, which ionizes the molecules of air [7]. This ionized trail (narrow plasma channel) has been considered to be useful for triggering and guiding the electrical discharges [8]. A number of laboratory experiments had proven the validity of this approach [9–13], and guided megavolt discharges with spark lengths up to 3.8 m [14] were reported to date. Physical processes underlying a laser-triggered discharge are basically understood [12, 15]. A simple explanation is that the light filament by means of multiphoton ionization produces a short-lived (in the range of nanoseconds [16]) conducting plasma channel [17, 18] that serves as a precursor for discharge. In long gaps free electrons are then accelerated by the external electric field and start a local avalanche process – the ionization wave, called streamer. The avalanche zone expands towards the direction of the opposite electrode developing a self-sustained conducting path (leader). Once a contact between the electrodes is established, an electrical discharge occurs. However, plasma filament cannot trigger an electrical discharge by itself because of its short lifetime, and the electrical discharge (or breakdown) appears after a certain delay (ranging from nanosecond to microsecond time scale) with respect to the optical pulse. As follows from the model, the buildup time for electrical discharge is governed by transient processes (electron drift velocity and avalanche ionization [6]) to provide the critical electron density for a conducting channel. Somewhat different scenario is proposed for discharges in small gaps, assuming a constant electron density produced by the laser pulse. The current circulating in the laser-induced plasma channel produces significant heating of a thin air column by the Joule effect, which in turn is followed by radial expansion of the heated volume, and air depression meets the conditions providing a path for a guided discharge [13]. The number of free electrons in air under atmospheric pressure in normal conditions is usually very low (estimated to be less than 10 cm [19]) as compared with the atmospheric molecular density of 3·10 cm, therefore, if external electric field is applied, build-up time for a spontaneous discharge is long and typically requires a strength of external electric
Some results of test beam studies of Transition Radiation Detector prototypes at CERN

Operating conditions and challenging demands of present and future accelerator experiments result in new requirements on detector systems. There are many ongoing activities aimed to develop new technologies and to improve the properties of detectors based on existing technologies. Our work is dedicated to development of Transition Radiation Detectors (TRD) suitable for different applications. In this paper results obtained in beam tests at SPS accelerator at CERN with the TRD prototype based on straw technology are presented. TRD performance was studied as a function of thickness of the transition radiation radiator and working gas mixture pressure.
How does Governmental vs. Private Venture Capital Backing Aect a Firm's Eciency? Evidence from Belgium

This paper investigates the implications of the venture capital (VC) investor type (government or private) on the operating efficiency of a sample of 515 Belgian portfolio firms up to three years after the investment. We show that within a pool of VC-backed firms, the targets of the government VC display significant reductions in productivity. No significant differences in efficiency are found in firms backed by private VC compared to their non-VC-backed peers. Finally, significant reductions of efficiency are still present in targets of government VC compared to their non-VC-backed peers.
A Unified Approach to the Estimation of Demand for Improved Seed in Developing Agriculture

This paper proposes a new approach for estimating the demand for seed within a developing country context where only improved seeds are sold but adoption rates for improved varieties low. A farmer views an improved seed firstly as a derived input embodying production attributes and secondly, as a technology embodying consumption characteristics. He therefore jointly decides on its adoption and the quantity of seed required to plant a predetermined area. Drawing on the theory of demand for consumption goods characteristics and production input attributes, this paper specified and estimated non-separable household demand and consumption models using data collected from 300 farm households in Zambia during the 2003/04 crop season. The estimated results suggest that adoption rate, distance to market, level of household grain self-sufficiency, seed hand-outs and household wealth are significant in determining farmers' seed purchase decisions. Appropriate intervention strategies for increased over-all improved seed demand are recommended. It is concluded that apart from contributing to the literature on modelling farm level seed demand, the model provides a holistic approach for the joint estimation of determinants of improved variety adoption and seed demand relevant for better targeting to increase the impacts of maize breeding research in developing countries.
Exploring the Role of Boundary Spanning in Distributed Networks of Knowledge

Knowledge sharing and creation are considered key processes leading to innovation and organizational performance. Several organizational initiatives have focused on building communities of practice in order to create a platform where employees can share experiences and insights. The focus in this paper is on one type of network structure, termed distributed networks of knowledge (DNoK). The success of such practices is deeply linked to whether or not formalization of the networks can hamper their knowledge creation and creativity. The role of leadership has been extensively discussed in the setting of communities of practice. However, this paper intends to shed new light on the topic by exploring the boundary management perspective in order to enable knowledge sharing and creation within this specific context of DNoK. To this end, we have examined the role of leadership styles in different DNoKs in a multinational firm.
Measurement of Vitamin D and Antioxidants Levels in Discoid Lupus Erythematosus Patients

DISCOID Lupus Erythematosus (DLE) is a chronic dermatological disease that can lead to scarring, hair loss, and hyperpigmentation changes in skin if it is not treated early and promptly. Diagnosis of discoid lupus is generally made based on clinical features. Sometimes, tests are required, including blood and urine samples. Similar to other many autoimmune conditions, DLE is generally a lifelong condition. However, there are treatments available that are usually effective and can help keep symptoms under control. IL-17 isoforms (IL-17A and IL-17F) are implicated in DLE.
On the optimality of optimal income taxation Preprints

The Mirrleesian model of income taxation restricts attention to simple allocation mechanism with no strategic interdependence, i.e., the optimal labor supply of any one individual does not depend on the labor supply of others. It has been argued by Piketty (1993) that this restriction is substantial because more sophisticated mechanisms can reach first-best allocations that are out of reach with simple mechanisms. In this paper, we assess the validity of Piketty’s critique in an independent private values model. As a main result, we show that the optimal sophisticated mechanism is a simple mechanism, or, equivalently, a Mirrleesian income tax system.
THE INFLUENCE OF SERVICE QUALITY MANAGEMENT PRACTICES ON THE PERFORMANCE OF HOTEL FIRMS IN KENYA

The principal objective of the study was to empirically assess the influence of service quality management practices (top management support, employee management, customer orientation, quality information, reward and recognition and product/service) on the performance of hotel firms in Kenya. The pertinent hypothesis was derived from the objective. The study population comprised 209 hotel firms registered with the Kenya Association of Hotelkeepers and Caterers (KAHC) which is the principal umbrella body that brings together duly registered hotels, lodges, restaurants, membership clubs and camps operating in Kenya. A descriptive cross-sectional survey was used. The relevant primary data were collected from Chief Executives and Senior Managers using semi-structured questionnaire. Data were analyzed using descriptive statistics, inferential statistics and regression analysis. The results of the study revealed that service quality management practices significantly influences performance. The coefficient of determination (R2) showed that service quality management practices explained 14.8% of the variation in overall firm performance. Holding other factors constant, a unit increase in service quality practices would cause a 0.359 increase in firm performance. A t-value of 3.857 was established at p=0.000 depicting that the relationship was statistically significant at 95% confidence level (p-value < .05). The study has made contributions to theory, policy and practice in relation to marketing in general and specifically in service quality management practices and firm performance in the hotel industry. Future research should include additional factors, use a longitudinal research design and test the model in different sectors of the economy.
Ferromagnetic resonance linewidth in metallic thin films: Comparison of measurement methods

Stripline (SL), vector network analyzer (VNA), and pulsed inductive microwave magnetometer (PIMM) techniques were used to measure the ferromagnetic resonance (FMR) linewidth for a series of Permalloy films with thicknesses of 50 and 100nm. The SL-FMR measurements were made for fixed frequencies from 1.5to5. 5GHz. The VNA-FMR and PIMM measurements were made for fixed in-plane fields from 1.6to8kA∕m (20–100Oe). The results provide a confirmation, lacking until now, that the linewidths measured by these three methods are consistent and compatible. In the field format, the linewidths are a linear function of frequency, with a slope that corresponds to a nominal Landau-Lifshitz phenomenological damping parameter α value of 0.007 and zero frequency intercepts in the 160–320A∕m (2–4Oe) range. In the frequency format, the corresponding linewidth versus frequency response shows a weak upward curvature at the lowest measurement frequencies and a leveling off at high frequencies.
Spectral Clustering with Automatic Cluster-Number Identification via Finding Sparse Eigenvectors

Spectral clustering is an empirically successful approach to separating a dataset into some groups with possibly complex shapes based on pairwise affinity. Identifying the number of clusters automatically is still an open issue, although many heuristics have been proposed. In this paper, imposing sparsity on the eigenvectors of graph Laplacian is proposed to attain reasonable approximations of the so-called cluster-indicator-vectors, from which the clusters as well as the cluster number are identified. The proposed algorithm enjoys low computational complexity as it only computes a relevant subset of eigenvectors. It also enjoys better clustering quality than the existing methods, as shown by simulations using nine real datasets.
FPGA Based Hybrid Sensorless Controller Design for PMSM Drive System

In order to improve the dynamic control performance of sensorless PMSM drive system, higher sampling frequency and faster calculation capability are required. As a result, in this work an FPGA based PMSM controller is investigated and a hybrid sensorless control is implemented combining square-wave pulsating signal injection at low speed range and arbitrary injection at high speed range. The current over-sampling technique enabled by flexible FPGA configuration is employed to increase the accuracy of current measurement. The experiments are carried out on an FPGA based testbench including a 3kW PMSM.
Diamond-based structures to collect and guide light

We examine some promising photonic structures for collecting and guiding light in bulk diamond. The aim of this work is to optimize single photon sources and single spin read-out from diamond color centers, specifically NV− centers. We review the modeling and fabrication (by focused ion beam and reactive ion etching) of solid immersion lenses, waveguides and photonic crystal cavities in monolithic diamond.
An adaptive procedure for Fourier estimators: illustration to deconvolution and decompounding

We introduce a new procedure to select the optimal cutoff parameter for Fourier density estimators that leads to adaptive rate optimal estimators, up to a logarithmic factor. This adaptive procedure applies for different inverse problems. We illustrate it on two classical examples: deconvolution and decompounding, i.e. non-parametric estimation of the jump density of a compound Poisson process from the observation of n increments of length ∆ > 0. For this latter example, we first build an estimator for which we provide an upper bound for its L 2-risk that is valid simultaneously for sampling rates ∆ that can vanish, ∆ := ∆ n → 0, can be fixed, ∆ n → ∆ 0 > 0 or can get large, ∆ n → ∞ slowly. This last result is new and presents interest on its own. Then, we show that the adaptive procedure we present leads to an adaptive and rate optimal (up to a logarithmic factor) estimator of the jump density.