nils-herrmann/clean_scirepeval huggingface dataset:
High frequency market microstructure.
Year: 2015

Markets are different now, transformed by technology and high frequency trading. In this paper, I investigate the implications of these changes for high frequency market microstructure (HFT) I describe the new high frequency world, with a particular focus on how HFT affects the strategies of traders and markets. I discuss some of the gaps that arise when thinking about microstructure research issues in the high frequency world. I suggest that, like everything else in the markets, research must also change to reflect the new realities of the high frequency world. I propose some topics for this new research agenda in high frequency market microstructure.
Harmonious and Joint Development Between NGOs and Governments in the Course of Social Transformation
Year: 2009

In the course of modernization and all round social transformation in China,the non government organizations should play an important role in providing specific public services,promoting self governance and participation awareness of the pubmic,reconciling the relations between the public and governments,stimulating the spirit of innovation,pushing the democratization process,breeding the civil society and other aspects because of their unique roles and functions as well as comparative advantages.However,in China,the functions of NGOs are limited,and the positive interaction and the complementary function between NGOs and government organizations are scarce.To achieve the harmonious and joint development between NGOs and governments,governments should deregulate NGOs,strengthen the supervision to NGOs,make room for the operation of NGOs and provide institutional support;NGOs need to improve the standard of self governance,the ability of political participation and the credibility of their own.
Electrical analysis and solder joint quality of PCB land pad design for QFP E pad package
Venue: 2017 International Conference on Electronics Packaging (ICEP)
Year: 2017

In traditional Quad Flat Package(QFP) solder joint quality and electrical analysis always been a critical issue. In original PCB land pad design, thermal opening is the same size of QFP thermal pad. In this design, solder joint yield is about 87.5% In order to overcome this problem, this paper proposes a new PCB land pad design as a solution. Let PCB thermal opening 25% of QFP thermal pad size. Sacrifice some thermal function to have better solder joint yield. Test the reliability to samples. Including Temperature Cycle Test(TCT) 40~1250C, through 0,500,1000 cycle, then through lead pull test. Make sure that samples have ideal solder joint. On the other side, randomly selected five samples from 240 samples. And measure the electrical performance of the samples. Measuring 100% 75% 50% 25% 0%size of QFP thermal pad design. In result, 25% and 0% land pad design have 100% yield in solder joint. In electrical analysis, 25%land pad design has almost the same performance with original design. In conclusion, 25% PCB thermal land pad can easily overcome solder joint yield problem without affecting the electrical performance.
Business Process Governance: Theorizing and Empirical Application
Venue: AMCIS
Year: 2011

Studies by Gartner (2010) or McKinsey (2008) suggest univocally that improving business processes is the undisputed number one priority for organizations world wide. Hence, organizations need adequate capabilities for Business Process Management (BPM) However, these capabilities do not necessarily need to be developed in the organization itself an inclusion using other sourcing structures (e.g. cooperation/network or market instead of hierarchy) is possible as well. This paper builds upon an understanding of BPM as a dynamic capability and a well known distinction of governance strategies (market, cooperation, hierarchy) to develop a business process governance framework. Using an extensive case study we initially test this framework in a European PRODUCTION company. Therefore, we make the following contributions: 1) development of a BPM theory that integrates dynamic capability and governance theory, 2) a model for understanding sourcing strategies in BPM, and 3) empirically sound factors explaining sourcing strategies in BPM. Our results suggest that organizations facing a low dynamic market environment do not employ dedicated resources for business process change but rely on ad hoc measures. Moreover, they gather these resources mostly internally (hierarchical governance) The paper ends with implications for both research and practice, limitations, and potential avenues for future research.
Testing the quantity quality model of fertility: Estimation using unrestricted family size models
Year: 2016

We examine the relationship between child quantity and quality. Motivated by the theoretical ambiguity regarding the sign of the marginal effects of additional siblings on children's outcomes, our empirical model allows for an unrestricted relationship between family size and child outcomes. We find that the conclusion in Black, Devereux, and Salvanes (2005) of no family size effect does not hold after relaxing their linear specification in family size. We find nonzero effects of family size in ordinary least squares estimation with controls for confounding characteristics like birth order and in instrumental variables estimation instrumenting family size with twin births. Estimation using a unrestricted specification for the quality quantity relationship yields substantial family size effects. This finding suggests that social policies that provide incentives for fertility should account for spillover effects on existing children.
Complex Markov Logic Networks: Expressivity and Liftability
Venue: UAI
Year: 2020

We study expressivity of Markov logic networks (MLNs) We introduce complex MLNs, which use complex valued weights, and we show that, unlike standard MLNs with real valued weights, complex MLNs are fully expressive. We then observe that discrete Fourier transform can be computed using weighted first order model counting (WFOMC) with complex weights and use this observation to design an algorithm for computing relational marginal polytopes which needs substantially less calls to a WFOMC oracle than a recent algorithm.
Visual and Auditory Brain Computer Interfaces
Venue: IEEE Transactions on Biomedical Engineering
Year: 2014

Over the past several decades, electroencephalogram (EEG) based brain computer interfaces (BCIs) have attracted attention from researchers in the field of neuroscience, neural engineering, and clinical rehabilitation. While the performance of BCI systems has improved, they do not yet support widespread usage. Recently, visual and auditory BCI systems have become popular because of their high communication speeds, little user training, and low user variation. However, building robust and practical BCI systems from physiological and technical knowledge of neural modulation of visual and auditory brain responses remains a challenging problem. In this paper, we review the current state and future challenges of visual and auditory BCI systems. First, we describe a new taxonomy based on the multiple access methods used in telecommunication systems. Then, we discuss the challenges of translating current technology into real life practices and outline potential avenues to address them. Specifically, this review aims to provide useful guidelines for exploring new paradigms and methodologies to improve the current visual and auditory BCI technology.
Crisis governance, Chinese style: distinctive features of China's response to the Covid 19 pandemic
Year: 2020

Since the outbreak of the novel coronavirus (Covid 19) epidemic in Wuhan, China has remained under the international spotlight. Despite hostile sentiments toward the country that are still prevalent in many parts of the world, it is clear that China has managed to contain this unprecedented public health crisis reasonably swiftly since the lockdown of Wuhan. What accounts for this "success" What are the experience and lessons that can be learnt by the international community and policy practitioners? This study seeks to reveal China's highly distinctive style of crisis governance behind its pandemic containment outcome since February 2020. We analyze how the Chinese government was able to mobilize the entire state machinery and all possible resources in this battle. Focus is given to the distinctive features at institutional, strategic, and operational levels, illustrating the country's style of crisis governance while also drawing necessary caveats.
Prevalence of seropositive toxoplasma cases in association with the frequency of abortion in sheep and goat
Year: 2018

Toxoplasmosis are a serious public health problem inhuman and animals especially in developing countries, it appear approximately thirty percent from all cases and have higher level of morbidity .At every stage of life the Toxoplasma gondii infections are a significant cause .The epidemiology and handling of this condition are various in the developing world, where infectious agents became predominate This study was proceed during the period from March 2017 to August 2017 to detect Toxoplasma gondii in sheep and goat serum by characterize them using two assays Latex agglutination test and IgG and IgM Toxoplasmosis ELISA kits. A total of 74 sera samples were collected from sheep and goat from different ages ranged 6 month to 2.5 years old were achieved in different reign in ALNajaf city Iraq ,they suffered from endemic abortion and still birth. The overall prevalence of Toxoplasma gondii in were32(62%,18(75% by Latex agglutination test for sheep and goat, respectively, with nonsignificant variation (P>0.05) between the two them ,The serum are arranged as follows in a total of 23 (71.8% and 9 (28.2%)abortion and still birth of sheep ,respectively, and17(94.4% 1(5.6% aborted and still birth of goat ,respectively, with significant differences (P<=0.05) between the two them. Out of 32 serum positive of Toxoplasmosis in sheep by using Latex agglutination test, there were 23(71,9% and 11(43,4% positive serum by using IgG and IgM ELISA kits, respectively, On the other hand out of 18 toxoplasmosis parasite in goat have positive result in Latex agglutination test, there were 11(61,1% and 6(33,3% by using IgG and IgM ELISA kits, respectively, our study was accelerated due to endemic clinical abortion and instill birth for sheep and goat and narrowing functional range of molecular assays by time consumption, in this regard the aim of our study used two functional assay diagnosis Latex agglutination assay and ELISA techniques with increase the accuracy for the detection of the Toxoplasmosis in sheep and goat.
The still under investigated role of cognitive deficits in PML diagnosis
Venue: Multiple Sclerosis and Demyelinating Disorders
Year: 2017

BackgroundDespite cognitive deficits frequently represent the first clinical manifestations of Progressive Multifocal Leukoencephalopathy (PML) in Natalizumab treated MS patients, the importance of cognitive deficits in PML diagnosis is still under investigated. The aim of the current study is to investigate the cognitive deficits at PML diagnosis in a group of Italian patients with PML.MethodsThirty four PML patients were included in the study. The demographic and clinical data, the lesion load and localization, and the longitudinal clinical course was compared between patients with (n 13) and without (n 15) cognitive deficit upon PML suspicion (the remaining six patients were asymptomatic) Clinical presentation of cognitive symptoms was described in detail.ResultAfter symptoms detection, the time to diagnosis resulted to be shorter for patients presenting with cognitive than for patients with non cognitive onset (p 0.03) Within patients with cognitive onset, six patients were presenting with language and/or reading difficulties (46.15% five patients with memory difficulties (38.4% three patients with apraxia (23.1% two patients with disorientation (15.3% two patients with neglect (15.3% one patients with object agnosia (7.7% one patient with perseveration (7.7% and one patient with dementia (7.7% Frontal lesions were less frequent (p 0.03) whereas temporal lesions were slightly more frequent (p 0.06) in patients with cognitive deficits. The longitudinal PML course seemed to be more severe in cognitive than in non cognitive patients (F 2.73, p 0.03) but differences disappeared (F 1.24, p 0.29) when balancing for the incidence of immune reconstitution syndrome and for other treatments for PML (steroids, plasma exchange (PLEX) and other therapies (Mefloquine, Mirtazapine, Maraviroc).ConclusionCognitive deficits at PML onset manifest with symptoms which are absolutely rare in MS. Their appearance in MS patients should strongly suggest PML. Clinicians should be sensitive to the importance of formal neuropsychological evaluation, with particular focus on executive function, which are not easily detected without a formal assessment.
Trion formation in a two dimensional hole doped electron gas
Year: 2016

The interaction between a single hole and a two dimensional, paramagnetic, homogeneous electron gas is studied using diffusion quantum Monte Carlo simulations. Electron hole relaxation energies, pair correlation functions, and electron hole center of mass momentum densities are reported for a range of electron hole mass ratios and electron densities. We find numerical evidence of a crossover from a collective excitonic state to a trion dominated state in a density range in agreement with that found in recent experiments on quantum well heterostructures.
Statistical methods for segmentation and quantification of minerals in ore microscopy
Year: 2012

Modern electronic image processing techniques have enabled mineral processing engineers to automate the determination of minerals in ore samples. The automatic recognition and quantification of minerals by light microscopy is one of the most important problems in ore processing systems because determining the amount and degree of liberation of the constituent minerals in ore is necessary for further processing. Measurement of the size and liberation degree of minerals is also required for automatic control of the grinding process. This paper suggests an automated method for segmenting and quantifying the size and amount of minerals in ore using micrographic images. A simple normalized colour based statistical segmentation method is proposed to exploit the average value, standard deviation and distribution of RGB colour components of mineral patterns in an ore image. The method also determines the deviations of colour components of the minerals to improve the segmentation. A Naive Bayes classifier is also introduced for segmenting the minerals. The performance of method is examined using micrographs in variety of qualities. The method performs segmentation accuracy over 90% Additionally, the success rates of the methods were found to be over 85% in measuring the grain sizes in a ground sample, and 86% in measuring liberation degrees of minerals after grinding process.
Panoramic video stitching
Year: 2012

Digital camera and smartphone technologies have made high quality images and video pervasive and abundant. Combining or stitching collections of images from a variety of viewpoints into an extended panoramic image is a common and popular function for such devices. Extending this functionality to video however, poses many new challenges due to the demand for both spatial and temporal continuity. Multi view video stitching (also called panoramic video stitching) is an emerging, common research area in computer vision, image/video processing and computer graphics and has wide applications in virtual reality, virtual tourism, surveillance, and human computer interaction. In this thesis, I will explore the technical and practical problems in the complete process of stitching a high resolution multi view video into a high resolution panoramic video. The challenges addressed include video stabilization, efficient multi view video alignment and panoramic video stitching, color correction, and blurred frame detection and repair. Specifically, I propose a continuity aware Kalman filtering scheme for rotation angles for video stabilization and jitter removal. For efficient stitching of long, high resolution panoramic videos, I propose constrained and multi grid SIFT matching schemes, concatenated image projection and warping and min space feathering. These three approaches together can greatly reduce the computational time and memory requirement in panoramic video stitching, which makes it feasible to stitch high resolution (e.g. 1920x1080 pixels) and long panoramic video sequences using standard workstations. Color correction is the emphasis of my research. On this topic I first performed a systematic survey and performance evaluation of nine state of the art color correction approaches in the context of two view image stitching. My evaluation work not only gives useful insights and conclusions about the relative performance of these approaches, but also points out the remaining challenges and possible directions for future color correction research. Based on the conclusions from this evaluation work, I proposed a hybrid and scalable color correction approach for general n view image stitching, and designed a two view video color correction approach for panoramic video stitching. For blurred frame detection and repair, I have completed preliminary work on image partial blur detection and classification, in which I proposed a SVM based blur block classifier using improved and new local blur features. Then, based on partial blur classification results, I designed a statistical thresholding scheme for blurred frame identification. For the detected blurred frames, I repaired them using polynomial data fitting from neighboring unblurred frames. Many of the techniques and ideas in this thesis are novel and general solutions to the technical or practical problems in panoramic video stitching. At the end of this thesis, I conclude the contributions made by this thesis to the research and popularization of panoramic video stitching, and describe those open research issues.
XGBoost Model for Chronic Kidney Disease Diagnosis
Venue: IEEE/ACM Transactions on Computational Biology and Bioinformatics
Year: 2020

Chronic Kidney Disease (CKD) is a menace that is affecting 10 percent of the world population and 15 percent of the South African population. The early and cheap diagnosis of this disease with accuracy and reliability will save 20,000 lives in South Africa per year. Scientists are developing smart solutions with Artificial Intelligence (AI) In this paper, several typical and recent AI algorithms are studied in the context of CKD and the extreme gradient boosting (XGBoost) is chosen as our base model for its high performance. Then, the model is optimized and the optimal full model trained on all the features achieves a testing accuracy, sensitivity, and specificity of 1.000, 1.000, and 1.000, respectively. Note that, to cover the widest range of people, the time and monetary costs of CKD diagnosis have to be minimized with fewest patient tests. Thus, the reduced model using fewer features is desirable while it should still maintain high performance. To this end, the set theory based rule is presented which combines a few feature selection methods with their collective strengths. The reduced model using about a half of the original full features performs better than the models based on individual feature selection methods and achieves accuracy, sensitivity and specificity, of 1.000, 1.000, and 1.000, respectively.
De "quantofrenias" y "artefactos" o la "doxa" en el reino de la "episteme" Uso y abusos de las escalas de estimaciones sumadas en la evaluacion del desempeno docente en contextos de educacion superior universitaria
Year: 2015

This work presents a methodological reflection on the use of summed estimation scales or Likert scales in teaching performance assessment in the university context. Information is presented in the framework of the technical prescriptions for scales of this kind, together with a series of observations referring to the relevance of applying them for assessment purposes and their limitations as tools for the generation of knowledge. It is concluded that the Likert scale may be used in the context of assessments, subject to all the requirements associated with its application and analytical interpretative treatment and recognising the insuperable problems which it presents; this will allow the construction of the numerical datum to be weighed and relativised. This approach throws a critical light on the 'quantophrenic' 'artefactual' nature of its application, revealing the contradictions of its use in the context of a discourse which places teacher assessment in the framework of policies on quality in higher education
The Relation between Descriptive Norms, Suicide Ideation, and Suicide Attempts among Adolescents
Venue: Suicide life threatening behavior
Year: 2019

This study examined the relationship between adolescents' beliefs about the prevalence of youth suicide ideation (ideation descriptive norms) and suicide attempts (attempt descriptive norms) with self reported suicide ideation and attempts. Descriptive norms, suicide ideation, and suicide attempts as well as gender, race/ethnicity, and exposure to family, peer, and others' suicide were assessed in 2,109 students at six suburban New York State high schools. After controlling for demographic variables and exposure to suicide, elevated ideation descriptive norms and attempt descriptive norms were associated with higher rates of suicide ideation and lifetime suicide attempts among adolescents. Adolescents who believed suicide ideation and attempts to be more widespread among peers (i.e. elevated ideation and attempt descriptive norms) were more likely to endorse suicide ideation and attempts. Correcting these descriptive norms may be a worthwhile goal for school based suicide prevention programs.
Integrating Extreme Programming and User Centered Design
Venue: PPIG
Year: 2008

The success of a software development project is associated not only with tools and technologies, but it also depends on how much the development process helps to be user centered and developer oriented. Involving customers in the process and being people oriented, Extreme Programming (XP) One of the popular agile methods can be a choice for developing a usable system. The project under study is a multimedia streaming application for mobile phones that allows to make content based search for audio and video content in large databases and play it on a mobile phone virtually anywhere, at any time. Our approach to application development focuses on the adoption of XP and User Centered Design (UCD) emphasizing iterative user interface development involving usability engineers and end users. The paper describes the process of integrating XP with user centered design and shows how an agile development technique facilitates to be user oriented and at the same time preserves the social values of the development team.