Miracle-dz/UniFAR-FTUs huggingface dataset:
The research on topic detection of microblog based on TC-LDA

With the rapid development of microblog, the research of topic detection has been paid more attention, which has begun to transfer from the traditional news media to microblog. However, compared with the traditional fields where topic detection applied, the microblogging data is written informally and the structure of that is not rigorous, which will bring great difficulties. In the process of topic detection, there will be lots of noise information extracted as the topics if using the traditional methods. Therefore, based on the Latent Dirichlet Allocation (LDA) model, the Topic-Coreterms Latent Dirichlet Allocation (TC-LDA) model for topic detection is proposed. With considering the microblogging features, the model increases a layer of background model to reduce the noise in microblogging data. The experiment shows that through the method of extending, the model can obtain good results and improve the generalization performance in the same environment.
Specific antibody‐dependent cellular cytotoxicity responses associated with slow progression of HIV infection

Antibody‐dependent cellular cytotoxicity (ADCC) is potentially an effective adaptive immune response to HIV infection. However, little is understood about the role of ADCC in controlling chronic infection in the small number of long‐term slow‐progressors (LTSP) who maintain a relatively normal immunological state for prolonged periods of time. We analysed HIV‐specific ADCC responses in sera from 139 HIV+ subjects not on antiretroviral therapy. Sixty‐five subjects were LTSP, who maintained a CD4 T‐cell count > 500/μl for over 8 years after infection without antiretroviral therapy and 74 were non‐LTSP individuals. The ADCC responses were measured using an natural killer cell activation assay to overlapping HIV peptides that allowed us to map ADCC epitopes. We found that although the magnitude of ADCC responses in the LTSP cohort were not higher and did not correlate with CD4 T‐cell depletion rates, the LTSP cohort had significantly broader ADCC responses compared with the non‐LTSP cohort. Specifically, regulatory/accessory HIV‐1 proteins were targeted more frequently by LTSP. Indeed, three particular ADCC epitopes within the Vpu protein of HIV were recognized only by LTSP individuals. Our study provides evidence that broader ADCC responses may play a role in long‐term control of HIV progression and suggests novel vaccine targets.
The role of Flexibility in Linking Operations Strategy to Marketing Strategy

Flexibility plays a major role in linking operations strategy to marketing strategy in which it gives an organization the ability to introduce new products, adjust capacity rapidly, and customize products. It enables organizations to respond effectively to changing circumstances, particularly, when dealing with the turbulent environment that may be characterized by rapid changes such as short and uncertain product life cycles, innovative process technologies, and customized products. More specifically, flexibility addresses operations strategy in which it is a quick response to change production volume, for example, expansion flexibility links marketing to operations strategy when dealing with growth strategies such as venturing into new markets. At the same time, flexibility interacts with marketing strategy in which it enables an organization to respond effectively and efficiently to change product mix, customization of product and introducing new products.
Cross-circulating current suppression method for parallel three-phase two-level inverters

The parallel architecture is very popular for power inverters to increase the power level. This paper presents a method for the parallel operation of inverters in an ac-distributed system, to suppress the cross-circulating current based on virtual impedance without current-sharing bus and communication bus. Simulation and experimental results verify the effectiveness of the control method.
Application and Development of a Fuzzy Analytic Hierarchy Process within a Capital Investment Study

Capital budgeting as a decision process is among the most important of all management decisions. The importance (consequents) of the subsequent outcome may bring a level of uncertainty to the judgement-making process by the decision maker(s) in the form of doubt, hesitancy, and procrastination. This study considers one such problem, namely the selection of the type of fleet car to be adopted by a small car rental company, a selection that accounts for a large proportion of the companyi¦s working capital. With a number of criteria to consider, a fuzzy analytic hierarchy process (FAHP) analysis is undertaken to accommodate the inherent uncertainty. Developments are made to the FAHP method utilised to consider the preference results with differing levels of precision in the pairwise judgements made.
Micromachined periodic surfaces for planar terahertz antennas

In this paper we present micromachined periodic partially reflective surfaces (PRS) employed in the design of planar Fabry-Perot type antenna for terahertz frequencies. The fabrication process is based on micromachining and metalizing multiple SU-8 photoresist layers. A resonant cavity is formed by placing the PRS over a single waveguide-fed aperture in a metallic ground at a distance of about half wavelength. A square aperture array within a metalized SU-8 layer is used as the PRS, and the dimensions are optimized using full wave simulations (CST Microwave StudioTM). A high gain antenna operating approximately at 284 GHz has been designed and a prototype has been fabricated.
On Yb:CaF2 and Yb:SrF2 : Review of spectroscopic and thermal properties and their impact on femtosecond and high power laser performance

We present an overview of laser results we obtained with Yb-doped calcium fluoride and its isotype strontium fluoride. In order to study the laser performance in femtosecond and high power regimes, spectral and thermal properties are first discussed including the potential of these crystals at room and cryogenic temperatures. Experimental demonstrations of high-power and ultrashort pulse oscillators and amplifiers are presented and analyzed.
Point Estimate Schemes to Solve the Probabilistic Power Flow

This paper analyzes the behavior of Hong's point estimate methods to account for uncertainties on the probabilistic power flow problem. This uncertainty may arise from different sources as load demand or generation unit outages. Point estimate methods constitute a remarkable tool to handle stochastic power system problems because good results can be achieved by using the same routines as those corresponding to deterministic problems, while keeping low the computational burden. In previous works related to power systems, only the two-point estimate method has been considered. In this paper, four different Hong's point estimate schemes are presented and tested on the probabilistic power flow problem. Binomial and normal distributions are used to model input random variables. Results for two different case studies, based on the IEEE 14-bus and IEEE 118-bus test systems, respectively, are presented and compared against those obtained from the Monte Carlo simulation. Particularly, this paper shows that the use of the scheme provides the best performance when a high number of random variables, both continuous and discrete, are considered.
Stability Analysis Based on Bifurcation Theory of the DSTATCOM Operating in Current Control Mode

This paper presents the stability analysis for a distribution static compensator (DSTATCOM) that operates in current control mode based on bifurcation theory. Bifurcations delimit the operating zones of nonlinear circuits and, hence, the capability to compute these bifurcations is of important interest for practical design. A control design for the DSTATCOM is proposed. Along with this control, a suitable mathematical representation of the DSTATCOM is proposed to carry out the bifurcation analysis efficiently. The stability regions in the Thevenin equivalent plane are computed for different power factors at the point of common coupling. In addition, the stability regions in the control gain space, as well as the contour lines for different Floquet multipliers are computed. It is demonstrated through bifurcation analysis that the loss of stability in the DSTATCOM is due to the emergence of a Neimark bifurcation. The observations are verified through simulation studies.
Mapping A new technique for rendering realistic buildings

Interior Mapping is a new real-time shader technique that renders the interior of a building when looking at it from the outside, without the need to actually model or store this interior. With Interior Mapping, raycasting in the pixel shader is used to calculate the positions of floors and walls behind the windows. Buildings are modelled in the same way as without Interior Mapping and are rendered on the GPU. The number of rooms rendered does not influence the framerate or memory usage. The rooms are lit and textured and can have furniture and animated characters. The interiors require very little additional asset creation and no extra memory. Interior Mapping is especially useful for adding more depth and detail to buildings in games and other applications that are situated in large virtual cities.
A flexible stereo calibration for a structured-light profilometer

The paper proposes a novel method for the calibration of a 3-D scanner composed of a camera and a projector. The proposed method models the projector as a second camera, and then reduces the calibration of a camera - projector pair into the calibration of a stereo pair of cameras, with advantages in terms of simplicity, flexibility, accuracy and availability of known solutions. This approach is very advantageous overall for those scanners whose camera and projector can be moved by the operators in order to achieve the most suitable configuration for the specific object under measurement. Results are shown for different organizations of the procedure and for different geometrical configurations. The uncertainty of calibrated parameters is also discussed.
Using scripting languages for hardware/software co-design

Τα Ενσωματωμένα Συστήματα σε Ψηφίδα υλικού (embedded Systems on Chip - SoC) περιέχουν τουλάχιστον έναν προγραμματιζόμενο επεξεργαστή αλλά και διάφορες μονάδες (IP cores) που διασυνδέονται στους διαύλους ελέγχου και δεδομένων του ως περιφερειακά ή συνεπεξεργαστές ειδικού σκοπού. Ένας τέτοιος τύπος σύνθετης ψηφιακής αρχιτεκτονικής μπορεί να αξιοποιήσει τις δυνατότητες επαναπρογραμματισμού (reconfiguration) των μονάδων FPGA για να επιτύχει υψηλές επιδόσεις και χαμηλή κατανάλωση ενέργειας. Τις προοπτικές αυτές όμως περιορίζει η έλλειψη εργαλείων συσχεδίασης υλικού/λογισμικού για τη γρήγορη πρωτοτυποποίηση(rapidprototyping)ενσωματωμένων πολυεπεξεργαστικών SoCs. Στην παρούσα διδακτορική διατριβή παρουσιάζουμε μεθοδολογία συσχεδίασης υλικού/λογισμικού για ενσωματωμένα πολυεπεξεργαστικά SoCsπου υλοποιείται με τη χρήση της δημοφιλούς scripting γλώσσας προγραμματισμού Python. Αναδεικνύουμε εκείνα τα χαρακτηριστικά της γλώσσας Pythonπου διευκολύνουν τη σχεδίαση ενσωματωμένων SoC με προγραμματιζόμενο επεξεργαστή (processor-centric) και την υλοποίηση τους σε μονάδες FPGA. Συγκεκριμένα αναπτύξαμε μεθόδους για: (α) υποστήριξη περιγραφών στοιχείων υλικού σε Python και αυτόματη μετατροπή τους σε VHDL, (β) χρήση περιγραφών Python για την προσομοίωση ενσωματωμένου συστήματος τόσο σε αλγοριθμικό επίπεδο λειτουργικότητας όσο και σε επίπεδο αρχιτεκτονικής RTL (Register Transfer level) και αυτόματη παραγωγή αρχείων ψηφιακών κυματομορφών με τα αποτελέσματα της ακριβούς προσομοίωσης (cycle-accurate και bit-true) του συστήματος. (γ) Υποστήριξη των απαραίτητων λειτουργιών για τον προγραμματισμό του επεξεργαστή σε γλώσσα C και (δ) παραγωγή αρχείων script (Tcl)για την εύκολη συνεργασία με υπάρχοντα εργαλεία λογικής σύνθεσης για τη φυσική υλοποίηση του συστήματος σε FPGA. Για τον έλεγχο των δυνατοτήτων της μεθοδολογίαςσχεδιάσαμε και υλοποιήσαμε με τη χρήση του SysPy τρία ενσωματωμένα πολυεπεξεργαστικά SoCs, τα οποία αναδεικνύουν τις νέες δυνατότητες συσχεδίασης και προσομοίωσης. Και τα τρία αυτά SoCsχρησιμοποιούν πυρήνα μικροεπεξεργαστή ως κύριο ελεγκτή του συστήματος αλλά και ειδικές μονάδες υλικού που σχεδιάστηκαν για την: α) επεξεργασία εικόνων, β) επεξεργασία αρχείων ήχου και γ) στοχαστική προσομοίωση βιολογικών δικτύων. Η διαδικασία υλοποίησης των τριώνπολυεπεξεργαστικών SoCs έγινε στα πλαίσια της εξέλιξης και βελτιστοποίησης του ίδιου του εργαλείου, ενώ κάθε σχέδιο χρησιμοποιεί και αναδεικνύει συγκεκριμένα του χαρακτηριστικά. Πιστεύουμε ότι η μεθοδολογία σχεδίασης που αναπτύχθηκε με χρήση της Python συνεισφέρει σημαντικά προς την κατεύθυνση της συσχεδίασης υλικού/λογισμικού και πρωτοτυποποίησης για ενσωματωμένα συστήματα σε ψηφίδα υλικού, τομέα όπου σήμερα δεν υπάρχουν ώριμα διαθέσιμα εργαλεία.
Nonlinear Analysis of Postural Sway in Multiple Sclerosis

Multiple Sclerosis (MS) is a disease which affects the central nervous system and causes balance problem. In clinical, this disorder is usually evaluated using static posturography. Some linear or nonlinear measures, extracted from the posturographic data (i.e. center of pressure, COP) recorded during a balance test, has been used to analyze postural control of MS patients. In this study, the trend (TREND) and the sample entropy (SampEn), two nonlinear parameters were chosen to investigate their relationships with the expanded disability status scale (EDSS) score. 40 volunteers with different EDSS scores participated in our experiments with eyes open (EO) and closed (EC). TREND and 2 types of SampEn (SampEn1 and SampEn2) were calculated for each combined COP’s position signal. The results have shown that TREND had a weak negative correlation to EDSS while SampEn2 had a strong positive correlation to EDSS. Compared to TREND and SampEn1, SampEn2 showed a better significant correlation to EDSS and an ability to discriminate the MS patients in the EC case. In addition, the outcome of the study suggests that the multi-dimensional nonlinear analysis could provide some information about the impact of disability progression in MS on dynamics of the COP data. Keywords—Balance, multiple sclerosis, nonlinear analysis, postural sway.
Organização flexível de documentos

Several methods have been developed to organize the growing number of textual documents. Such methods frequently use clustering algorithms to organize documents with similar topics into clusters. However, there are situations when documents of di erent clusters can also have similar characteristics. In order to overcome this drawback, it is necessary to develop methods that permit a soft document organization, i.e., clustering documents into di erent clusters according to di erent compatibility degrees. Among the techniques that we can use to develop methods in this sense, we highlight fuzzy clustering algorithms (FCA). By using FCA, one of the most important steps is the evaluation of the yield organization, which is performed considering that all analyzed topics are adequately identi ed by cluster descriptors. In general, cluster descriptors are extracted using some heuristic over a small number of documents. The adequate extraction and evaluation of cluster descriptors is important because they are terms that represent the collection and identify the topics of the documents. Therefore, an adequate description of the obtained clusters is as important as a good clustering, since the same descriptor might identify one or more clusters. Hence, the development of methods to extract descriptors from fuzzy clusters obtained for soft organization of documents motivated this thesis. Aiming at investigating such methods, we developed: i) the SoftO-FDCL (Soft Organization Fuzzy Description Comes Last) method, in which descriptors of fuzzy clusters are extracted after clustering documents, identifying topics regardless the adopted fuzzy clustering algorithm; ii) the SoftO-wFDCL (Soft Organization weighted Fuzzy Description Comes Last) method, in which descriptors of fuzzy clusters are also extracted after the fuzzy clustering process using the membership degrees of the documents as a weighted factor for the candidate descriptors; iii) the HSoftO-FDCL (Hierarchical Soft Organization Fuzzy Description Comes Last) method, in which descriptors of hierarchical fuzzy clusters are extracted after the hierarchical fuzzy clustering process, identifying topics by means of a soft hierarchical organization of documents. Besides presenting these new methods, this thesis also discusses the application of the SoftO-FDCL method on documents produced by the Canadian continuing medical education program, presenting the utility and applicability of the soft organization of documents in real-world scenario.
Luminescence from Liquid Helium Excited by Corona Discharges

Liquid helium (LHe) at 4.2 K was electronically excited using a corona discharge for both negative and positive high voltages. The experiments were carried out for different pressures in the range from 0.1 to 10 MPa at constant temperature. The light emitted from the zone close to the tip was spectroscopically analyzed showing features from atoms and excimer helium. The shifts and widths of the observed lines and bands were found to depend on the applied hydrostatic pressure and on the tip polarity. Our analysis showed that classic pressure broadening theory cannot account for the observed widths and shifts rather than the presence of bubbles which surround single excited atoms and molecules. For positive tip polarities red shifted features distinct from pure He and He2* were observed and tentatively assigned to "red satellites".
Incorporation of Marble Sludge in Industrial Building Eco-blocks or Cement Bricks Formulation

Producing eco-blocks to be used in houses’ building from marble sludge through maximum possible substitution of sludge for sand and other components of the mixed materials used in block manufacturing was investigated. Samples of different formulations, in the form of extruded bars, were produced at both laboratory and pilot-plant scales and characterized at the final stage of the production process. 178 formulations were prepared to examine the proper formulation that fits national and international standards. Just five of them were promising and two were chosen for commentary purposes. The main objective of this study was to investigate the possibility of marble sludge recycling in the use in useful materials such as house building materials. The other objectives can be summarized in saving natural resources and reducing their used quantity. The experimental results and their theoretical interpretation show that suitable incorporation of marble sludge can result in building blocks of 15 cm with superior properties in terms of water absorption (7%). The compressive strength at age of 28 days only reached (195.8 kN or 7.8 N/mm2).
Mesoscale cyclogenesis dynamics over the southwestern Ross Sea, Antarctica

Previous work has shown that frequent mesoscale cyclogenesis adjacent to Franklin Island is linked to the strong and persistent katabatic winds from East Antarctica which funnel into Terra Nova Bay and then blow out over the southwestern Ross Sea. Four mesoscale cyclones that formed near Terra Nova Bay between February 16 and 20, 1988 are examined to more clearly define the governing mechanisms. These events are investigated using all available observations, including automatic weather station data, high-resolution satellite images, satellite soundings, and hemispheric synoptic analyses. The first two cyclones formed on low-level baroclinic zones established by the synoptic scale advection of warm moist air toward the cold continental air blowing gently from East Antarctica. In the second case, baroclinic instability of this small-scale cold front was apparently triggered by the enhanced upward vertical motion associated with the approach of a midtropospheric trough. The third mesocyclone formed shortly after on a baroclinic zone over the polar plateau; the second vortex completely disrupted the usual katabatic drainage over the plateau and forced warm moist air over the coastal slopes. All three cyclones moved to the north in the prevailing cyclonic flow, but the plateau vortex lasted for only 6 hours. The fourth mesoscale low formed in conjunction with an abrupt and intense surge of katabatic air from Terra Nova Bay which resharpened the coastal baroclinic zone. At the same time a transiting midtropospheric trough probably associated with lower tropospheric upward vertical motion apparently accelerated the katabatic winds and triggered the vortex formation. A similar katabatic wind-forced mesocyclone formed near Byrd Glacier. The two vortices moved to the east-southeast and northeast, respectively, apparently being steered by the generating katabatic airstreams, and merged just to the north of the Ross Ice Shelf. The combined vortex reintensified as another trough passed overhead and moved eastward to West Antarctica where it dissipated two days later.
A Sizer model for cell differentiation in Arabidopsis thaliana root growth

Plant roots grow due to cell division in the meristem and subsequent cell elongation and differentiation, a tightly coordinated process that ensures growth and adaptation to the changing environment. How the newly formed cells decide to stop elongating becoming fully differentiated is not yet understood. To address this question, we established a novel approach that combines the quantitative phenotypic variability of wild‐type Arabidopsis roots with computational data from mathematical models. Our analyses reveal that primary root growth is consistent with a Sizer mechanism, in which cells sense their length and stop elongating when reaching a threshold value. The local expression of brassinosteroid receptors only in the meristem is sufficient to set this value. Analysis of roots insensitive to BR signaling and of roots with gibberellin biosynthesis inhibited suggests distinct roles of these hormones on cell expansion termination. Overall, our study underscores the value of using computational modeling together with quantitative data to understand root growth.
A DBR laser employing passive-section heaters, with 10.8 nm tuning range and 1.6 MHz linewidth

A wavelength-tunable, three-section, distributed Bragg reflector (DBR) InGaAsP/InP laser diode is described. The refractive indices of the DBR section and the phase-control section are thermally controlled by thin-film heaters embedded on these passive sections. This structure enables wide-range wavelength tuning without the spectral linewidth broadening accompanying conventional tuning by current injection into the passive sections. A tuning range of 10.8 nm and a linewidth of less than 1.6 MHz have been achieved in the 1.5- mu m wavelength region. The temperature increase in the active layer is held to within a few degrees, even when the DBR-section temperature reaches 90 degrees C. <<ETX>>