nils-herrmann/clean_scirepeval huggingface dataset:
Binary Diagnosis of Hall Effect Sensors in Brushless DC Motor Drives
Venue: IEEE Transactions on Power Electronics
Year: 2020

Commonly, three Hall effect sensors are used to detect the rotor position in brushless motors. Since one of these sensors may fail and lead to unstable operation, fault tolerant control (FTC) of Hall sensor drives has attracted renewed research attention recently to ensure very high reliability. This article presents simple combinatory functions to detect fails in Hall effect sensors based only on Hall sensors signals, which require just a memory of 3 b. The proposed method guarantees more reliability and overcomes erroneous alarms that can be triggered by previous fault diagnosis methods using the information on the observed acceleration, which may be the subject of unexpected variations and lead consequently to false diagnosis. In addition, the article opens the discussion about the BLDC startup with a faulty sensor, in order to perform FTC algorithms ensuring a long use of the motor given the difficulty to repair Hall effect sensors inserted between the coils inside the stator. To confirm the theoretical analysis, experimental results are reported and limitations on the performances of the faulty system in terms of fault detection and signal reconstruction algorithm are discussed. The proposed schemes circuits can be inserted in conventional drive systems or by being placed between the existing driver and the motor.
On the design for AGVs: Modeling, path planning and localization
Venue: 2011 IEEE International Conference on Mechatronics and Automation
Year: 2011

Intelligent warehouse becomes a key component of logistics process automation, which essentially promotes the productivity and cost reduction. This paper presents a novel design solution of an Automated Guided Vehicles (AGVs) system for intelligent warehouse. An improved version of classical Dijkstra shortest path algorithm is proposed for efficient global path planning. In the case of multi AGV, the time windows method is used to address the issue of conflict and deadlock. In addition, the local path planning and auto localization is addressed by using a heuristics based algorithm and Monte Carlo Localization algorithm respectively. Extensive numerical experiments based on Player/Stage simulator are carried out to assess the suggested algorithms, for a range of scenarios and the result well validates its effectiveness. Currently the proposed design solution is adopted in developing the prototype of AGVs to be deployed in practice.
Zingerone regulates intestinal transit, attenuates behavioral and oxidative perturbations in irritable bowel disorder in rats.
Venue: Phytomedicine international journal of phytotherapy and phytopharmacology
Year: 2014

Stress can lead to the manifestation of functional gastrointestinal disorders, the most prominent being irritable bowel disorder. The present study investigated the impact zingerone in ameliorating chronic water stress induced irritable bowel disorder, brain gut axis dysfunction and dysregulation of the intestinal barrier due to oxidative stress. Rats were randomly allocated to groups and subjected to chronic water stress for a period of 21 days for 1h and the fecal pellet output was measured. At the end of chronic stress, behavioral assessment for anxiety like behavior was recorded and plasma corticosterone levels were measured 60min after water stress. The colonic transit was determined, levels of oxidative and antioxidant biomarkers were measured in the colon homogenate. Myeloperoxidase activity was determined as an indirect index of neutrophil infiltration. Chronic water stress increased the rate of colonic transit, fecal output, induced behavioral changes, and decreased antioxidant levels. An increase in lipid peroxide levels, catalase and corticosterone was observed. Mast cell infiltration was evident in the stressed group. Zingerone significantly reduced colonic transit, fecal output, neutrophil infiltration, and lipid peroxide formation. The levels of catalase were not altered; however, a marginal increase in the levels of glutathione peroxidase was observed. Zingerone significantly enhanced the levels of superoxide dismutase, glutathione and decreased the levels of corticosterone. Zingerone produced marked improvement in stress induced irritable bowel disorder which could be attributed to the powerful antioxidant nature, direct effect on the intestinal smooth muscle and adaptogenic nature.
Um Algoritmo Exato em clusters de GPUs para o Hitting Set Aplicado a Inferencia de Redes de Regulacao Genica
Year: 2020

We propose a Hitting Set problem (HSP) algorithm suited for GRN inference applications by introducing innovations in the data structures and a sorting scheme to allow efficient discarding of Hitting Set non solution candidates. We provided an implementation for multi core CPUs and for (homogeneous and heterogeneous) GPU clusters. Experimental results show that the optimizations offered significant individual performance gains and a high scalability with increasing number of GPUs. The conjunction of these gains resulted in speedups above 60 for the parallel part of the algorithm. We publish two papers: one in conference (Qualis CC A1) and the other in journal (Qualis CC A2) Resumo. Propomos um algoritmo para resolver o problema do Hitting Set (HSP) adequado para aplicacoes de inferencia de GRNs, introduzindo inovacoes nas estruturas de dados e um mecanismo de ordenacao que permite um descarte eficiente de candidatos que nao sao solucao. Foram providas implementacoes em CPU multi core e em clusters (homogeneos e heterogeneos) de GPU. Resultados experimentais mostraram que as otimizacoes ofereceram ganhos de desempenho individuais significativos e alta escalabilidade com o aumento do numero de GPUs. A conjuncao desses ganhos resultou em speedups acima de 60 para a parte paralela do algoritmo. Publicamos dois artigos: um em congresso (Qualis CC A1) e outro em periodico (Qualis CC A2) 1. Introducao e Motivacao Diversas areas de estudo possuem problemas teoricos ou praticos os quais podem ser modelados, em parte ou como um todo, como uma instancia do problema da Transversal Minima (do Ingles, Hitting Set Problem ou HSP) A area de Biologia de Sistemas nao e uma excecao, apresentando aplicacoes tais como distancia reversa genomica [Kolman and Walen 2007] experimentos com reacao em cadeia de polimerase [Pearson et al. 1996] e inferencia de redes de regulacao genica (do Ingles Gene Regulatory Networks ou GRNs) [Ideker et al. 2000, Ruchkys and Song 2003] Ideker et al. [Ideker et al. 2000] por exemplo, utiliza uma abordagem iterativa de perturbacao de sinais, na qual se aplicam perturbacoes sucessivas nos niveis de expressao dos genes e as *Financiado pelo CNPq 6.720 (4000 x 1.68) (about R$ 17.440 lesser or 72.18% So, with the application of the complete model, the cost total to correct the essays would be R$ 5.360 (4000 x 1.34) a reduction of R$ 18.800 or 77,81% compared to the traditional model or reduction of R$ 1.360 or 20.23% compared to the model without gamification. Now, imagine the gains if increase the number of schools, which means more students or increase the amount of essays performed by student.
Many Objective Particle Swarm Optimization Using Two Stage Strategy and Parallel Cell Coordinate System
Venue: IEEE Transactions on Cybernetics
Year: 2017

It is a daunting challenge to balance the convergence and diversity of an approximate Pareto front in a many objective optimization evolutionary algorithm. A novel algorithm, named many objective particle swarm optimization with the two stage strategy and parallel cell coordinate system (PCCS) is proposed in this paper to improve the comprehensive performance in terms of the convergence and diversity. In the proposed two stage strategy, the convergence and diversity are separately emphasized at different stages by a single objective optimizer and a many objective optimizer, respectively. A PCCS is exploited to manage the diversity, such as maintaining a diverse archive, identifying the dominance resistant solutions, and selecting the diversified solutions. In addition, a leader group is used for selecting the global best solutions to balance the exploitation and exploration of a population. The experimental results illustrate that the proposed algorithm outperforms six chosen state of the art designs in terms of the inverted generational distance and hypervolume over the DTLZ test suite.
3D printing of optimized catalyst's support geometries for syngas synthetic chemicals conversion in fixed bed reactors
Year: 2020

The storage of renewable energy is an important point in the roadmap of the European energetic plan, following a development strategy of low carbon technology. In this context the development of flexible power to liquid (P to L) and power to gas (P to G) processes for energy storage is one of the most promising solutions for the smooth transition from a driven fossil fuel society to a driven renewable sources society. In this regard, Fischer Tropsch (FT) synthesis is used to obtain valuable chemicals from syngas (H2/CO mixture) through a catalytic reaction. The syngas can be obtained from renewable sources such as the co electrolysis of CO2 H2O in a SOEC electrolyzer. Therefore, in this way it is possible to contribute to the CO2 reduction and the renewable synthesis of valuable chemicals. In order to design energy conversion devices, 3D printing as additive manufacturing (AM) technique has been recently gaining relevance. The 3D printing technique offers more advantages respect to the classical way of production by extrusion, such as the capability to increase shape complexity while reducing waste material and manufacturing cost. In this work, an efficient cobalt (Co) based catalyst for the Fischer Tropsch synthesis is developed by using modelling software, called CAD (Computer Aided Design) 3D printing technology and an impregnation method. As catalyst`s support and 3D printing material, a Al2O3 is employed because of the low cost of this ceramic material and its positive effects on Co based catalyst for FT synthesis. Moreover, the addition of small amount of rhenium (Re) as promoter of the Co improves the availability of Co active sites. In order to reach a trade off between the effectiveness of the catalyst and the conditions to evaluate the catalyst in a fixed bed reactor (FBR) an eggshell Co promoted Re 3D printed supported a Al2O3 with a diameter of about 1 mm and active catalytic layer of 20 mm is designed. Characterization techniques such as X ray diffraction (XRD) scanning electron microscopy (SEM) Specific Surface area (BET) Thermal programming reduction/oxidation (TPR/TPO) among the most relevant ones, are applied in order to characterize the materials during the design and synthesis process of the catalyst, after thermal treatment in different conditions as well as after the FT reaction. The designed catalyst is tested in a fixed bed reactor (FBR) Finite elements modelling (FEM) is performed to determine the temperature and pressure conditions to carry out the evaluation of the catalyst and to compare the performance of the modelled catalytic bed with the experimental results. Experimental results show that the designed eggshell Co promoted Re/3D printed supported a Al2O3 catalyst provides a conversion of syngas of around 55 and a selectivity toward C5+ of about 81 at 210 degC and 20 bar with a gas hourly space velocity (GHSV) of 993 NmL/(h*gcat) and syngas composition of H2:CO ratio equal to 1.7. The experimental results are in agreement with the FEM simulations.
Gender trouble in the workplace: applying Judith Butler's theory of performativity to news organizations
Year: 2018

Judith Butler's theory of performativity, introduced in her 1990 book Gender Trouble, has significantly shaped individual and collective understandings of gender. This essay examines performativity as a framework for critically assessing gender performances in patriarchal workplace environments, including the institutional rules and norms that shape behaviors and interactions. Specifically, we suggest that performativity offers a valuable lens for critiquing women's experiences in newsrooms, spaces where expectations for gender can significantly shape professional experiences and success. We provide an overview and evaluation of the development and existing applications of Butler's performativity theory, including its use in organizational contexts. We also propose methodological and topical approaches through which performativity can be used to study newsrooms and the experiences of female journalists in particular.
Class Discriminative Feature Embedding For Meta Learning based Few Shot Classification
Venue: 2020 IEEE Winter Conference on Applications of Computer Vision (WACV)
Year: 2020

Although deep learning based approaches have been very effective in solving problems with plenty of labeled data, they suffer in tackling problems for which labeled data are scarce. In few shot classification, the objective is to train a classifier from only a handful of labeled examples in a support set. In this paper, we propose a few shot learning framework based on structured margin loss which takes into account the global structure of the support set in order to generate a highly discriminative feature space where the features from distinct classes are well separated in clusters. Moreover, in our meta learning based framework, we propose a context aware query embedding encoder for incorporating support set context into query embedding and generating more discriminative and task dependent query embeddings. The task dependent features help the metalearner to learn a distribution over tasks more effectively. Extensive experiments based on few shot, zero shot and semi supervised learning on three benchmarks show the advantages of the proposed model compared to state of the art.
Design and Development of a Mobile Decision Support System: Guiding Clinicians Regarding Law in the Practice of Psychiatry in Emergency Department
Venue: 2017 IEEE 30th International Symposium on Computer Based Medical Systems (CBMS)
Year: 2017

Decision making in an emergency department needs to be efficient. It does not allow observation of the patient for a prolonged period of time, especially if the patients harm themselves or others, or refuses treatment. This includes suicidal, violent, intentional self inflicted or non consenting to treatments patient. Clinicians have to quickly decide whether to call the police, admit the patient to the psychiatric ward, according to recommended, predefined procedures. Since, for different situations different laws are applicable, clinicians need to follow certain procedures and consider specific legal issues while also handling challenging patients at the emergency department. Finding the right information quickly and following the recommended procedure is essential since the repercussions for a doctor acting incorrectly could be severe. This paper presents a mobile decision support system (DSS) prototype designed for healthcare providers to identify and follow the correct procedure based on applicable laws to mitigate the chance of incorrect actions being taken, along with the associated risks and preserve both the patients and their own rights. We explored healthcare providers requirements and alternatives for visualizing information by conducting observation, semi structured interviews and a total of four co design workshops. The resulting mobile DSS enables clinicians to quickly access the correct information regarding their power and authority while also protecting the safety and welfare of the patient. Usability evaluation of the prototype showed that the average time spent to complete a given task was about 12 seconds by a total of six medical interns. Participants of the evaluation described the system easy to use, intuitive and highly useful for everyday use.
Why the Entry Regulation of Mobile Phone Manufacturing in China Collapsed: The Impact of Technological Innovation
Venue: The Journal of Law and Economics
Year: 2011

This paper analyzes why an entry regulation that generated large rents was abruptly abolished. We argue that the rents supporting the regulation dissipated because a new technology encouraged illegal entry by raising the cost of enforcement. In 1998, China introduced a licensing system for the manufacturing of mobile phones. This system created large monopoly rents for those who received the licenses. Later, in 2003, an integrated chip was invented that significantly lowered the costs of manufacturing mobile phones. Immediately thereafter, thousands of unlicensed manufacturers started producing mobile phones. The manufacturers who had been licensed previously suffered large losses from this competition, and many went bankrupt. The new chip technology raised the cost of enforcement by making entry extremely cheap. The regulators turned to local governments and telephone network operators for assistance in suppressing the illegal phones, but both groups did not cooperate because they benefited from the flourishing illegal phone industry.
Carbon nanotubes accelerate methane production in pure cultures of methanogens and in a syntrophic coculture
Venue: Environmental microbiology
Year: 2017

Carbon materials have been reported to facilitate direct interspecies electron transfer (DIET) between bacteria and methanogens improving methane production in anaerobic processes. In this work, the effect of increasing concentrations of carbon nanotubes (CNT) on the activity of pure cultures of methanogens and on typical fatty acid degrading syntrophic methanogenic coculture was evaluated. CNT affected methane production by methanogenic cultures, although acceleration was higher for hydrogenotrophic methanogens than for acetoclastic methanogens or syntrophic coculture. Interestingly, the initial methane production rate (IMPR) by Methanobacterium formicicum cultures increased 17 times with 5 g*L 1 CNT. Butyrate conversion to methane by Syntrophomonas wolfei and Methanospirillum hungatei was enhanced ~1.5 times) in the presence of CNT (5 g*L 1 but indications of DIET were not obtained. Increasing CNT concentrations resulted in more negative redox potentials in the anaerobic microcosms. Remarkably, without a reducing agent but in the presence of CNT, the IMPR was higher than in incubations with reducing agent. No growth was observed without reducing agent and without CNT. This finding is important to re frame discussions and re interpret data on the role of conductive materials as mediators of DIET in anaerobic communities. It also opens new challenges to improve methane production in engineered methanogenic processes.
Study on contribution of the asymmetric stress to the birefringence induced by an ultrashort single laser pulse inside fused silica glass
Year: 2016

Stress induced birefringence due to asymmetry in axial and radial directions that is generated because of the interaction of ultrashort laser pulses with a transparent material is numerically studied. The coupled equations of nonlinear Schrodinger and plasma density evolution are solved to calculate the deposited energy density and initial temperature profile. Fourier's heat equation and the equations related to the thermo elasto plastic model are solved to calculate the temperature evolution and distribution of induced displacement inside the material, respectively. Finally, by numerically calculating the distribution of the induced refractive index changes experienced by both axially and radially probe beams, induced stress birefringence is calculated for different characteristics of writing pulses. Furthermore, the induced stress birefringence is experimentally realized, and the effect of the energy of the writing pulse is investigated. To know how the induced refractive index changes and birefringence.
Self healing epoxy nanocomposite coatings based on dual encapsulation of nano carbon hollow spheres with film forming resin and curing agent
Venue: Composites Part B: Engineering
Year: 2019

The ability of an active protective organic coating to restore its protection functionality in case of a coating defect is of pivotal importance to ensure durable performance under demanding corrosive conditions. In this paper, a self healing epoxy system is fabricated by separate encapsulation of epoxy and polyamine in carbon hollow spheres (CHSs) and the autonomous healing performance of the system applied on mild steel is investigated. CHSs were synthesized via a silica templating method using carbonization of polysaccharide shells formed on the surface of silica templates. Consequently, epoxy and polyamine were loaded in separate capsules by dispersion of CHSs into the dilute solutions of epoxy/acetone and polyamine/acetone respectively, under vacuum conditions. The synthesized CHSs were characterized before and after the silica removal using field emission scanning electron microscopy (FE SEM) and transmission electron microscopy (TEM) The CHSs loaded with the film forming agents were assessed using thermogravimetric analysis (TGA) and Fourier transform infrared (FTIR) spectroscopy. Furthermore, the protective and self healing properties of the coatings fabricated were studied using electrochemical impedance spectroscopy (EIS) scanning vibrating electrode technique (SVET) and salt spray testing. The results showed that scribe defects in epoxy coatings with 10 wt epoxy and polyamine capsules were healed effectively upon efficient release and subsequent recombination of the epoxy and polyamine agents reforming a protective layer at the damaged region.
Reliability of concentric and eccentric strength of hip abductor and adductor muscles in young soccer players
Venue: Biology of sport
Year: 2015

The concentric and eccentric strength profile and muscular balance of the hip joint are important parameters for success in soccer. This study evaluated the reliability for the assessment of hip abduction and adduction isokinetic strength over a range of angular velocities (30 and 90deg/s) and types of muscular actions (concentric and eccentric) in young soccer players. The reliability for the assessment of reciprocal (conventional and functional) and bilateral torque ratios was also examined. Fifteen male soccer players (15+ 1 years) performed two sessions, separated by three days. The testing protocol consisted of five maximal concentric and eccentric hip abductions and adductions of both legs at angular velocities of 30deg/s and 90deg/s. The peak torque was evaluated in young soccer players using an isokinetic dynamometer (Cybex Norm) and the reciprocal strength ratios (conventional and functional) and bilateral ratios (non preferred to preferred leg ratios) were calculated. The test retest reliability for the assessment of peak torque (ICC 0.71 0.92) and of reciprocal muscle group ratios (ICC 0.44 0.87) was found to be moderate to high. Bilateral torque ratios exhibited low to moderate reliability (ICC 0.11 0.64) In conclusion, isokinetic strength of hip abductor and adductor muscles and the conventional and functional strength ratios can be reliably assessed in young soccer players, especially at low angular velocities. The assessment, however, of bilateral strength ratios for hip abductor/adductor muscles should be interpreted with more caution.