cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Assessment of procurement challenges in implementing Ethiopian Sugar Corporation projects the case of Kessem Sugar Factory project
Creators: name: W/Tensay, Sintayehu
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2018

description: The study focused on procurement challenges in ESC. This study was designed to fill the gap by identifying procurement challenges to deliver ESC project on time and within the allocated budget. It sought to answer the questions: What are challenges the project procurement and their influence in the of ESC project in the case of kessem sugar factory project? Consequently, it proposed to achieve the objectives: to assess the challenges the project procurement and their impact in the of ESC project in the case of kessem project and to examine factors need to be improved in order to overcome the procurement challenges in ESC project in the case of kessem sugar factory project. The researcher used questionnaires to collect quantitative data, distributed to purposefully selected respondents from project procurement staffs of ESC and used key informant interview for qualitative data collection for selected project managers, staffs, and procurement managers. Methodologically, this study was designed to be descriptive.The study presented in five chapters each with various sections through which the researcher has tried to discuss the different issues related procurement challenges on the project performance.The key findings of the study were that project procurement function affected by various factors. Among them the performance of main contractor, sub-contractors, suppliers and venders, the performance of procurement staff and consultants in practicing the project procurement and quality of the work performed and equipment supplied are the major project procurement challenges which affected the performance of ESC Kessem sugar factory project. The findings of this study should be understood and evaluated in light of the limitations of the study. This study is especially helpful to ESC projects and other similar projects. It should be particularly helpful to the project procurement team and project managers whose responsibilities include attainment of the project objective to the desired customer satisfaction. The study recommends to ESC project procurement team and top management to look at the challenges of project the procurement discussed herein and adopts the suggested recommendations including usage of recent technology, standard contractor selection criteria, skilled and experienced procurement staff, organized list of contractor, subcontractor, suppliers and recorded performance in order to overcome the challenges. Further study should be directed to the project procurement for further improvement.
Path decompositions of tournaments
Creators: name: Girão, António
name: Granet, Bertille
name: Kühn, Daniela
name: Lo, Allan
name: Osthus, Deryk
Publisher: name: arXiv
Year: 2020
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics

description: In 1976, Alspach, Mason, and Pullman conjectured that any tournament $T$ of even order can be decomposed into exactly ${\rm ex}(T)$ paths, where ${\rm ex}(T):= \frac{1}{2}\sum_{v\in V(T)}|d_T^+(v)-d_T^-(v)|$. We prove this conjecture for all sufficiently large tournaments. We also prove an asymptotically optimal result for tournaments of odd order.
description: 73 pages, 2 figures; final version, to appear in the Proceedings of the London Mathematical Society
Low Algorithmic Complexity Entropy-deceiving Graphs
Creators: name: Zenil, Hector
name: Kiani, Narsis
name: Tegnér, Jesper
Publisher: name: arXiv
Year: 2016
Subjects: subject: Information Theory (cs.IT)
subject: Computational Complexity (cs.CC)
subject: Combinatorics (math.CO)
subject: FOS: Computer and information sciences
subject: FOS: Mathematics
subject: F.1.3

description: In estimating the complexity of objects, in particular of graphs, it is common practice to rely on graph- and information-theoretic measures. Here, using integer sequences with properties such as Borel normality, we explain how these measures are not independent of the way in which an object, such as a graph, can be described or observed. From observations that can reconstruct the same graph and are therefore essentially translations of the same description, we will see that when applying a computable measure such as Shannon Entropy, not only is it necessary to pre-select a feature of interest where there is one, and to make an arbitrary selection where there is not, but also that more general properties, such as the causal likelihood of a graph as a measure (opposed to randomness), can be largely misrepresented by computable measures such as Entropy and Entropy rate. We introduce recursive and non-recursive (uncomputable) graphs and graph constructions based on these integer sequences, whose different lossless descriptions have disparate Entropy values, thereby enabling the study and exploration of a measure's range of applications and demonstrating the weaknesses of computable measures of complexity.
description: 28 pages
Impact of Noisy Labels on Dental Deep Learning—Calculus Detection on Bitewing Radiographs
Creators: name: Büttner, Martha
name: Schneider, Lisa
name: Krasowski, Aleksander
name: Krois, Joachim
name: Feldberg, Ben
name: Schwendicke, Falk
Publisher: name: Charité - Universitätsmedizin Berlin
Year: 2023
Subjects: subject: artificial intelligence
subject: machine learning
subject: deep learning
subject: computer vision
subject: convolutional neural networks
subject: calculus
subject: digital imaging
subject: radiology
subject: 600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit::610 Medizin und Gesundheit

description: Supervised deep learning requires labelled data. On medical images, data is often labelled inconsistently (e.g., too large) with varying accuracies. We aimed to assess the impact of such label noise on dental calculus detection on bitewing radiographs. On 2584 bitewings calculus was accurately labeled using bounding boxes (BBs) and artificially increased and decreased stepwise, resulting in 30 consistently and 9 inconsistently noisy datasets. An object detection network (YOLOv5) was trained on each dataset and evaluated on noisy and accurate test data. Training on accurately labeled data yielded an mAP50: 0.77 (SD: 0.01). When trained on consistently too small BBs model performance significantly decreased on accurate and noisy test data. Model performance trained on consistently too large BBs decreased immediately on accurate test data (e.g., 200% BBs: mAP50: 0.24; SD: 0.05; p < 0.05), but only after drastically increasing BBs on noisy test data (e.g., 70,000%: mAP50: 0.75; SD: 0.01; p < 0.05). Models trained on inconsistent BB sizes showed a significant decrease of performance when deviating 20% or more from the original when tested on noisy data (mAP50: 0.74; SD: 0.02; p < 0.05), or 30% or more when tested on accurate data (mAP50: 0.76; SD: 0.01; p < 0.05). In conclusion, accurate predictions need accurate labeled data in the training process. Testing on noisy data may disguise the effects of noisy training data. Researchers should be aware of the relevance of accurately annotated data, especially when testing model performances.
Delivery of siRNA using porous silicon nanoparticles
Creators: name: TIEU, TERENCE
Publisher: name: Monash University
Year: 2021
Subjects: Pharmaceutical sciences

description: RNA interference (RNAi) has been hailed as a technique capable of silencing genes that drive key biological processes that contribute to diseases such as cancer. However, siRNA molecules have many inherent disadvantages and the use of nanoparticles have been used to circumvent these issues. This thesis aims to further the understanding of porous silicon nanoparticles as a non-viral siRNA delivery vehicle. Furthermore, the work explores the use of patient-derived tissue as a new model for evaluating nanoparticle formulations.
Laser ablation production of Ba, Ca, Dy, Er, La, Lu, and Yb ions
Creators: name: Olmschenk, S.
name: Becker, P.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We use a pulsed nitrogen laser to produce atomic ions by laser ablation, measuring the relative ion yield for several elements, including some that have only recently been proposed for use in cold trapped ion experiments. For barium, we monitor the ion yield as a function of the number of applied ablation pulses for different substrates. We also investigate the ion production as a function of the pulse energy, and the efficiency of loading an ion trap as a function of radiofrequency voltage.
description: 6 pages, 6 figures
Acupuncture in Patients with Diabetic Peripheral Neuropathy-Related Complaints: A Randomized Controlled Clinical Trial
Creators: name: Dietzel, Joanna
name: Habermann, Isabel V.
name: Hörder, Sebastian
name: Hahn, Katrin
name: Meyer-Hamme, Gesa
name: Ortiz, Miriam
name: Hua, Kevin
name: Stöckigt, Barbara
name: Bolster, Marie
name: Grabowska, Weronika
name: Roll, Stephanie
name: Binting, Sylvia
name: Willich, Stefan N.
name: Schröder, Sven
name: Brinkhaus, Benno
Publisher: name: Charité - Universitätsmedizin Berlin
Year: 2023
Subjects: subject: acupuncture
subject: diabetic peripheral neuropathy
subject: pain
subject: numbness
subject: randomized controlled trial
subject: 600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit::610 Medizin und Gesundheit

description: Background: Diabetic polyneuropathy (DPN) is a common complication of diabetes, which presents with a loss of sensorimotor function or pain. This study assessed the effectiveness and safety of acupuncture as a treatment for DPN-related complaints. Methods: In this randomized controlled trial, patients with type II diabetes and symptoms of neuropathy in the lower limbs were included. A total of 12 acupuncture treatments were administered over 8 weeks. The waitlist control group received the same acupuncture treatment starting at week 16 (after baseline). Results: A total of 62 patients were randomized (acupuncture group n = 31; control group n = 31). The primary outcome was overall complaints, and it was reduced with a significant difference of 24.7 on a VAS (CI 95% 14.8;34.7, p < 0.001) between both groups in favor of acupuncture. Reductions were recorded for the secondary outcomes VAS pain, neuropathic pain symptom inventory (NPSI), emotional dimensions of pain, SF-12, and diabetic peripheral neuropathic pain impact (DPNPI) after the intervention and at the follow-ups in the acupuncture group. Adverse reactions were minor and transient. Conclusions: Acupuncture leads to a significant and lasting reduction in DPN-related complaints when compared to routine care and is well tolerated, with minor side effects.
Resonant Coupling in the Formation of Ultracold Ground State Molecules via Photoassociation
Creators: name: Dion, C. M.
name: Drag, C.
name: Dulieu, O.
name: Laburthe Tolra, B.
name: Masnou-Seeuws, F.
name: Pillet, P.
Publisher: name: The American Physical Society
Year: 2001
Subjects: subject: 530

description: Physical Review Letters
Inversión pública en agua potable y calidad de vida de los habitantes de los municipios de los Montes de María del Departamento de Bolívar
Creators: name: González Gómez, Luis Guillermo
name: Serrano Van Strahlen, Alejandra
Publisher: name: Universidad de Cartagena
Year: 2017
Subjects: Inversiones
Crecimiento económico
Agua potable y saneamiento básico - Departamento de Bolívar - Inversión pública
Calidad del agua

description: Tesis (Economista).--Universidad de Cartagena. Facultad de Ciencias Económicas. Programa de Economía, 2017
description: Esta investigación analiza la evolución de la inversión pública en agua potable y saneamiento básico en los municipios del departamento de Bolívar que pertenecen a la subregión de los Montes de María durante el periodo 1994-2014, y de qué manera influye en la calidad de vida de sus habitantes, para tal fin fue necesario utilizar las participaciones territoriales a partir de información extraída del Departamento Nacional de Planeación para observar el comportamiento de la inversión en los sectores de educación, salud, deporte, cultura y agua potable y saneamiento básico y de esta forma determinar el nivel de eficiencia en la administración de los recursos destinados para estos rubros.
Critical Success Factors to Information Technology Projects Implementation: the Case of Commercial Bank of Ethiopia
Creators: name: Yenehun, Elias
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2018

description: For an organization performing its business in today's competitive business environment information technology/information system is already considered as a critical factor. And, given the fact that IT system projects are one of the most costly investment decisions and one of a very few major strategic dimensions to giant service providers (including Commercial Bank of Ethiopia (CBE)) and similarly getting them implemented is majorly a challenging task by itself. The overall purpose of this project work is to discover the CSFs to IS/IT system projects implementation process in terms of their empirical importance in the case of Commercial Bank of Ethiopia (CBE). Regards to the methodology employed for this project work, a quantitative data collected from previous implementers of IS/IT system project(s) used, whereas Principal Component Analysis (PCA) statistical estimation technique was used together with its related data testing tools. Whereas, the analysis part consists of ranking CSFs through descriptive statistics, computing commonalities, unrotated and rotated component matrix, total variance calculation, Pearson correlation technique, and covariance etc. to materialize the above analysis, a statistical software package for social science (SPSS) was used. Using the above methods of analysis, Top Management Support, Team Work, Composition, and Capability, Project Leadership, Proper and Adequate Training, Project Management, Technological Infrastructure, Business Process Adjustment, Information Systems Adjustment, Processes and Sub-processes (Stakeholders) Participation, and Business Process Fit: Data Fit were found as an individual key success factors. Whereas, Five major principal components (dimensions) of CSFs were extracted for this particular project work, these are already labeled as Process related CSFs, Quality related CSFs Enterprise related CSFs Project related CSFs, Business and IT System Alignment related CSFs. Each of these dimensions contained from seven to two high loadings (variables or CSFs). All in all, organization looking for adopting various state-of-the art IS/IT system technologies in general, and commercial banks in particular to be efficient and effective they have to focus on the areas organizational and related business readiness issues, such as in terms improving technological infrastructure, business processes and information systems adjustments, processes and subprocesses participation and/or stakeholders and more importantly higher and proper support of top managements. To this end, providing a better attention to those CSFs explored as key one beyond all other critical factors are suggested to be a proper move toward s achieving major objectives of successful implementation of IS/IT project implementation.
Can crowdsourcing rescue the social marketplace of ideas?
Creators: name: Yasseri, Taha
name: Menczer, Filippo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Social and Information Networks (cs.SI)
subject: Computers and Society (cs.CY)
subject: Physics and Society (physics.soc-ph)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Facebook and Twitter recently announced community-based review platforms to address misinformation. We provide an overview of the potential affordances of such community-based approaches to content moderation based on past research and preliminary analysis of Twitter's Birdwatch data. While our analysis generally supports a community-based approach to content moderation, it also warns against potential pitfalls, particularly when the implementation of the new infrastructure focuses on crowd-based "validation" rather than "collaboration." We call for multidisciplinary research utilizing methods from complex systems studies, behavioural sociology, and computational social science to advance the research on crowd-based content moderation.
description: In Press in Communications of the ACM (CACM)
Rapid Maxillary Expansion Treatment in Patients with Cleft Lip and Palate: A Survey on Clinical Experience in the European Cleft Centers
Creators: name: Khdairi, Nadiajda
name: Halilah, Talal
name: Khandakji, Mohannad
name: Bartzela, Theodosia
Publisher: name: Charité - Universitätsmedizin Berlin
Year: 2023
Subjects: subject: cleft lip and palate
subject: rapid maxillary expansion
subject: secondary alveolar bone graft
subject: treatment protocols
subject: survey
subject: complication
subject: European cleft centers
subject: orthodontics
subject: 600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit::610 Medizin und Gesundheit

description: Cleft lip and palate patients require complex interdisciplinary treatment, including maxillary expansion and secondary alveolar bone grafting. However, the evidence on these treatment procedures and outcomes is lacking. Therefore, this study aimed to survey the subjective observations of European maxillofacial surgeons and orthodontists on the maxillary expansion and bone grafting treatment protocols and the associated complications. An online questionnaire was sent to 131 centers. The questions assessed the participants' demographic data, maxillary expansion and alveolar bone grafting protocols, and the associated complications. Descriptive statistics and a t-test were used to analyze the data. The response rate was 40.5%. The average age for maxillary expansion was 9-10 years. The secondary alveolar bone grafting was planned 5-10 months after the expansion. The most common complications were asymmetric expansion, relapse, and fistula formation. The protocols and materials used vary widely among centers. Anatomical alterations and developmental processes, like tooth eruption adjacent to the cleft, should be seriously considered for treatment planning. This survey showed that there is still a lack of consensus on these treatment procedures. Further clinical trials should focus on long-term outcome evaluation to identify treatment components for optimal alveolar bone substitution and transversal maxillary expansion treatment in patients with clefts.
title: Robust increase of the translocator protein 18 kDa (TSPO), demonstrated with the selective radioligand [123I]CLINDE, in an adult rat model of Traumatic Brain Injury
Creators: name: Donat, Cornelius K.
name: Gaber, Khaled
name: Meixensberger, Jürgen
name: Brust, Peter
name: Pinborg, Lars H.
name: Mikkelsen, Jens D.
Publisher: name: German Medical Science GMS Publishing House
Year: 2015
Subjects: subject: 610 Medical sciences; Medicine

description: Question: Traumatic brain injury (TBI) can cause long-term disability by mechanisms not fully elucidated. Neuroinflammation is part of the secondary injury cascade, and is therefore regarded as a potential target for treatment and diagnostics, employing molecular imaging techniques. TSPO, a protein [for full text, please go to the a.m. URL]
description: 60th Annual Meeting of the German Society for Neuropathology and Neuroanatomy (DGNN)
title: Exiled Lives on the Stage
title: When Storytellers become the Story
titleType: Subtitle
Creators: name: Verstraete, Pieter
Publisher: name: Freie Universität Berlin
Year: 2023
Subjects: subject: theatre studies
subject: art in exile
subject: performance studies
subject: Modern Turkey
subject: support systems
subject: artists at risk
subject: exile studies
subject: exile literature
subject: Exilforschung
subject: theatre ethnography
subject: exilic performative
subject: multiculturalism
subject: London
subject: Berlin
subject: postcolonialism
subject: 700 Arts and recreation::790 Recreational and performing arts::792 Stage presentations

description: In this article, I reflect on some of the observations I have made in recent months as part of my Marie Curie project, entitled Exiled Lives on the Stage (agreement No: 893827). I organized two panels on 29 September 2022, in Berlin’s Engelnest (with solidarity network Kopuntu) and at the Free University Berlin, and one on 25 October at London Hackney’s Arcola Theatre (with theatre production company Pan Productions). In between, I also recorded new episodes of the podcast series, Exiled Lives (available at all relevant platforms). My guests were Memet Ali Alabora, Mîrza Metîn and Kawa Nemir at Engelnest, and Barış Celiloğlu, Naz Yeni and Koray Can Yanaşır at the Arcola. What struck me was that they were all good storytellers in their own right; yet a characteristic of displacement born out of necessity is that the storytellers are not entirely in control of their own narratives. They become the story. I wish to address in this article a few of my insights.
Demand Dispatch with Heterogeneous Intelligent Loads
Creators: name: Mathias, Joel
name: Bušić, Ana
name: Meyn, Sean
Publisher: name: arXiv
Year: 2016
Subjects: subject: Systems and Control (eess.SY)
subject: Optimization and Control (math.OC)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Mathematics
subject: 90C40, 93E20, 60J22

description: A distributed control architecture is presented that is intended to make a collection of heterogeneous loads appear to the grid operator as a nearly perfect battery. Local control is based on randomized decision rules advocated in prior research, and extended in this paper to any load with a discrete number of power states. Additional linear filtering at the load ensures that the input-output dynamics of the aggregate has a nearly flat input-output response: the behavior of an ideal, multi-GW battery system.
description: Extended version of the paper that was published in Proc. 50th Annual Hawaii International Conference on System Sciences (HICSS), 2017. This version contains an extended appendix that provides details relevant to the simulations, including: (i) design of the optimal linear inverse filter in Appendix A2, and (ii) the creation of nominal transition matrices for TCLs using Monte Carlo in Appendix A3
Theory for all-optical responses in topological materials: the velocity gauge picture
Creators: name: Kim, Dasol
name: Shin, Dongbin
name: Landsman, Alexandra S.
name: Kim, Dong Eon
name: Chacón, Alexis
Publisher: name: arXiv
Year: 2021
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: High Harmonic Generation (HHG), which has been widely used in atomic gas, has recently expanded to solids as a means to study highly nonlinear electronic response in condensed matter and produce coherent high frequency radiation with new properties. Most recently, attention has turned to Topological Materials (TMs) and the use of HHG to characterize topological bands and invariants. Theoretical interpretation of nonlinear electronic response in TMs, however, presents many challenges. In particular, the Bloch wavefunction phase of TMs has undefined points in the Brillouin Zone. This leads to singularities in calculating the inter-band and intra-band transition dipole matrix elements of Semiconductor Bloch Equations (SBEs). Here, we use the laser-electromagnetic velocity gauge ${\boldsymbol p}\cdot {\bf A}(t)$ to numerically integrate the SBEs and treat the singularity in the production of the electrical currents and HHG spectra. We use a prototype of Chern Insulators (CIs), the Haldane model, to demonstrate our approach. We find good qualitative agreement of the velocity gauge compared to the length gauge and the Time-Dependent Density Functional theory in the case of topologically trivial materials such as MoS$_2$. For velocity gauge and length gauge, our two-band Haldane model reproduces key HHG spectra features: ($\textit i$) The selection rules for linear and circular light drivers, ($\textit ii$) The linear cut-off law scaling and ($\textit iii$) The anomalous circular dichroism. We conclude that the velocity-gauge approach captures experimental observations and provides theoretical tools to investigate topological materials.
Assessment Of Factors Affecting Project Scoping: The Case Of National Switching System Of Ethiopia
Creators: name: Girma, Betsega
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2018

description: This research aims at assessing the major factors that affected project scoping efforts in the case of the National Payment Switch of Ethiopia. The project is being conducted in phases and this research covers the first phase of the project concerned with integrating the Automated Teller Machines (ATMs) in the country. EthSwitch S.C. is the project organization that has undertaken and still undertaking the project. The research is of qualitative type and has used interviews and questionnaires for primary data collection and reviewed publications for secondary data. Upon analyzing the data, it was found that the project's scoping efforts have not been performed to the expected levels and in turn, the project's performance has been limited to only a moderate level. The major factors that have been affecting the project's scoping efforts have been found to be a lack of a properly stated project management plan, initial scoping problems, lack of stakeholder involvement, scope change management problems, lack of skilled information technology workforce and country wide infrastructure issues. To improve the current performance of the project in the proceeding phases, the researcher suggested that improved stakeholder management and communication, planning that takes the locally available skill as well as infrastructure into consideration, availing high level trainings to team members and setting up a dedicated customer support center should be taken into consideration.
Targeting Sphingolipid Metabolism and Signalling in Drug Discovery
Creators: name: HAN, XU
Publisher: name: Monash University
Year: 2021
Subjects: Pharmaceutical sciences
Epidemiology not elsewhere classified
Pharmacology and pharmaceutical sciences not elsewhere classified
Biochemistry and cell biology not elsewhere classified
Medicinal and biomolecular chemistry not elsewhere classified

description: Sphingolipids have been linked to many disease conditions, such as inflammation, fibrosis, cancer, autoimmune disease, and cardiovascular disease. Sphingolipids serve as both dynamic structural features in lipid membranes, involved in changes in membrane shape and fluidity, and as important signalling elements. As part of a broader effort in employing Chemical Biology approaches using small-molecules modulators of enzymes and receptors to identify disease targets and drug leads, this thesis mostly focuses on the development of novel and selective small-molecule inhibitors of selected enzymes and receptors in the sphingolipid pathway: dihydroceramide desaturase-1 (Des1) and sphingosine kinases (SK1/2), sphingosine-1-phosphate (S1P) receptor-1 (S1P1 receptor).
Estrategias meta cognitivas para mejorar la comprensión lectora en los niños y niñas de 6 años del grado primero de la Institución Educativa San Lucas.
Creators: name: Julio Barragán, Lindis Esther
name: Doria Vega, Xiomara
Publisher: name: Universidad de Cartagena
Year: 2016
Subjects: Comprensión de lectura
Lectura - Enseñanza
Niños - Aprendizaje

description: El proyecto tiene como objeto de estudio la aplicación de las estrategias metacognitivas, para dotar a los niños de 6 años del grado primero y evidenciar los resultados y ver el papel que desempeñan en la comprensión lectora como herramientas mediadoras para alcanzar un aprendizaje significativo.
description: El proyecto tiene como objeto de estudio la aplicación de las estrategias metacognitivas, para dotar a los niños de 6 años del grado primero y evidenciar los resultados y ver el papel que desempeñan en la comprensión lectora como herramientas mediadoras para alcanzar un aprendizaje significativo.
Real phase structures on matroid fans and matroid orientations
Creators: name: Rau, Johannes
name: Renaudineau, Arthur
name: Shaw, Kris
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: Algebraic Geometry (math.AG)
subject: FOS: Mathematics
subject: 52C40 (Primary), 05B35 and 14T05 (Secondary)

description: We introduce the notion of real phase structure on rational polyhedral fans in Euclidean space. Such a structure consists of an assignment of affine spaces over $\mathbb{Z}/2\mathbb{Z}$ to each top dimensional face of the fan subject to two conditions. Given an oriented matroid we can construct a real phase structure on the fan of the underlying matroid. Conversely, we show that from a real phase structure on a matroid fan we can produce an orientation of the underlying matroid. Thus real phase structures are cryptomorphic to matroid orientations. The topes of the orientated matroid are recovered immediately from the real phase structure. We also provide a direct way to recover the signed circuits of the oriented matroid from the real phase structure.
description: 24 pages, 5 figures. Comments are welcome
Goodness-of- fit tests for multivariate copula-based time series models
Creators: name: Berghaus, Betina
name: Bücher, Axel
Publisher: name: Technische Universität Dortmund
Year: 2014
Subjects: subject: empirical process
subject: semiparametric copula model
subject: ranks
subject: pseudo-observations
subject: multivariate observations
subject: Markov chain
subject: multiplier central limit theorem
subject: 310
subject: 330
subject: 620

description: In recent years, stationary time series models based on copula functions became increasingly popular in econometrics to model nonlinear temporal and cross-sectional dependencies. Within these models, we consider the problem of testing the goodness-of-fit of the parametric form of the underlying copula. Our approach is based on a dependent multiplier bootstrap and it can be applied to any stationary, strongly mixing time series. The method extends recent i.i.d. results by Kojadinovic, Yan and Holmes [I. Kojadinovic, Y. Yan and M. Holmes, Fast large sample goodness-of- fit tests for copulas, Statistica Sinica 21 (2011), 841{871] and shares the same computational benefits compared to methods based on a parametric bootstrap. The finite-sample performance of our approach is investigated by Monte Carlo experiments for the case of copula-based Markovian time series models.
description: Discussion Paper / SFB 823;22/2014
Probing the conformal Calabrese-Cardy scaling with cold atoms
Creators: name: Unmuth-Yockey, J.
name: Zhang, Jin
name: Preiss, P. M.
name: Yang, Li-Ping
name: Tsai, S. -W.
name: Meurice, Y.
Publisher: name: arXiv
Year: 2016
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: High Energy Physics - Lattice (hep-lat)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We demonstrate that current experiments using cold bosonic atoms trapped in one-dimensional optical lattices and designed to measure the second-order Renyi entanglement entropy S_2, can be used to verify detailed predictions of conformal field theory (CFT) and estimate the central charge c. We discuss the adiabatic preparation of the ground state at half-filling where we expect a CFT with c=1. This can be accomplished with a very small hoping parameter J, in contrast to existing studies with density one where a much larger J is needed. We provide two complementary methods to estimate and subtract the classical entropy generated by the experimental preparation and imaging processes. We compare numerical calculations for the classical O(2) model with a chemical potential on a 1+1 dimensional lattice, and the quantum Bose-Hubbard Hamiltonian implemented in the experiments. S_2 is very similar for the two models and follows closely the Calabrese-Cardy scaling, (c/8)\ln(N_s), for N_s sites with open boundary conditions, provided that the large subleading corrections are taken into account.
description: 5 pages, 4 figures, uses revtex, references added, intro modified, supplemental material added at the end
Nautical Tourism in Medio Tejo (Portugal): the wakeboard activity
Creators: name: Lopes, Eunice
name: Carvalho, Francisco
name: Simões, João Tomaz
Publisher: name: Journal of Tourism & Development
Year: 2023

description: Nautical tourism is a growing product in Portugal, following a long tradition related to aquatic products. The wakeboard activity gained important visibility, especially due to the first world championship, in 2017, on the Zêzere river. The study now presented focuses mainly on the importance of valuing river-water resources and the Zêzere river, through wakeboard activity, for the consolidation of an efficient tourism product in the dynamic promotion of tourist and cultural attractiveness. For this purpose, as a methodology, a questionnaire survey was applied in areas of the Zêzere river equipped with a cable park, to understand the importance of wakeboarding in the development of river tourism in the territory. This study aims to enrich the knowledge of the wakeboard activity integrated into the nautical tourist product of the Medio Tejo. The results point to a growing trend in demand for this activity by residents and tourists, who combine leisure with knowledge of the heritage resources (material and immaterial) of this territory. The appreciation of the activity can lead local agents and actors to know and invest in the territory, making wakeboarding an activity of great economic, social, cultural, and environmental importance, contributing to the promotion and development of this territory.
description: Journal of Tourism & Development, vol. 40 (2023)
Magangue y su sector comercio. Factores que limitan su desarrollo
Creators: name: Acuña Cuello, Migdonia
name: Beltran Hernández, Maria
Publisher: name: Universidad de Cartagena
Year: 1990
Subjects: Comercio

description: Tesis (Administrador de Empresas).--Universidad de Cartagena. Facultad de Ciencias Económicas. Programa de Administración de Empresas, 1990
description: El presente estudio tiene por objeto realizar un diagnostico de los aspectos mas importantes del comercio, para conocer los factores que inciden en su desarrollo o atraso.
AttDLNet: Attention-based DL Network for 3D LiDAR Place Recognition
Creators: name: Barros, Tiago
name: Garrote, Luís
name: Pereira, Ricardo
name: Premebida, Cristiano
name: Nunes, Urbano J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: LiDAR-based place recognition is one of the key components of SLAM and global localization in autonomous vehicles and robotics applications. With the success of DL approaches in learning useful information from 3D LiDARs, place recognition has also benefited from this modality, which has led to higher re-localization and loop-closure detection performance, particularly, in environments with significant changing conditions. Despite the progress in this field, the extraction of proper and efficient descriptors from 3D LiDAR data that are invariant to changing conditions and orientation is still an unsolved challenge. To address this problem, this work proposes a novel 3D LiDAR-based deep learning network (named AttDLNet) that uses a range-based proxy representation for point clouds and an attention network with stacked attention layers to selectively focus on long-range context and inter-feature relationships. The proposed network is trained and validated on the KITTI dataset and an ablation study is presented to assess the novel attention network. Results show that adding attention to the network improves performance, leading to efficient loop closures, and outperforming an established 3D LiDAR-based place recognition approach. From the ablation study, results indicate that the middle encoder layers have the highest mean performance, while deeper layers are more robust to orientation change. The code is publicly available at https://github.com/Cybonic/AttDLNet
description: This preprint has not undergone peer review or any post-submission improvements or corrections. The Version of Record of this contribution is published in ROBOT 2022: Fifth Iberian Robotics Conference, and is available online at https://doi.org/10.1007/978-3-031-21065-5_26
title: Vertrauen in autonome Technik
title: Modellierung und Simulation von Mensch-Maschine-Interaktion in experimentell-soziologischer Perspektive
titleType: AlternativeTitle
Creators: name: Fink, Robin D.
Publisher: name: Technische Universität Dortmund
Year: 2014
Subjects: subject: Autonome Technik
subject: Handlungstheorie
subject: Vertrauen
subject: Mensch-Maschine-Interaktion
subject: ABMS
subject: Computersimulation
subject: Fahrerassistenzsysteme
subject: 330
subject: Automation
subject: Mensch-Maschine-Kommunikation
subject: Vertrauen
subject: Soziotechnik
subject: Computersimulation
subject: Handlungstheorie

description: Autonome Technik, z.B. ein Fahrerassistenzsystem, beschränkt sich nicht mehr nur auf bloßes „Funktionieren“, sondern greift aktiv in gesellschaftliche Interaktionszusammenhänge ein. Dabei werden Handlungsmöglichkeiten menschlicher Akteure eingeschränkt und es besteht die Gefahr des Fehllaufens. In dem Kontext stellen sich Fragen nach den Bedingungen, unter denen Vertrauen in ebendiese Technik entstehen kann. Ausgehend von der Überlegung, dass Vertrauen in einem engen Wechselverhältnis zu Verhalten und damit Handlungen steht, ist eine soziologisch fundierte Sichtweise auf Aspekte der Mensch-Maschine-Interaktion, die anschlussfähig ist an ingenieurwissenschaftliche und informatische Denkweisen, von wesentlicher Bedeutung. Unter Rekurs auf handlungstheoretische Ansätze lässt sich das Zusammenhandeln von Mensch und autonomer Technik in Form eines operationalisierbaren und computersimultativ umsetzbaren Makro-Mikro-Makro-Modells soziologischer Erklärung rekonstruieren. Basierend auf diesem Modell werden wechselseitige Modellzuschreibungen, also Handlungsmodelle, die dem jeweiligen Interaktionspartner unterstellt werden, als theoretisch-methodologischer Zugang zum Verständnis von Mensch-Maschine-Interaktion vorgeschlagen. Dabei hat sich in zwei Experimentalstudien, von denen eine auf die Methode der agentenbasierten Modellierung und Simulation (ABMS) zurückgreift, gezeigt, dass ein Zusammenhang zwischen Modellzuschreibungsdifferenzen und Vertrauen besteht. Sofern die implementierten Erwartungen der Programmierer mit den Erwartungen, die Nutzer an autonome Technik adressieren, in Deckung gebracht werden können, kann das Vertrauen in und damit auch die Akzeptanz von Technik gesteigert werden.
Machine Learning in Dentistry: A Scoping Review
Creators: name: Arsiwala-Scheppach, Lubaina T.
name: Chaurasia, Akhilanand
name: Müller, Anne
name: Krois, Joachim
name: Schwendicke, Falk
Publisher: name: Charité - Universitätsmedizin Berlin
Year: 2023
Subjects: subject: dental radiography
subject: dentistry
subject: machine learning
subject: neural networks
subject: scoping review
subject: 600 Technik, Medizin, angewandte Wissenschaften::610 Medizin und Gesundheit::610 Medizin und Gesundheit

description: Machine learning (ML) is being increasingly employed in dental research and application. We aimed to systematically compile studies using ML in dentistry and assess their methodological quality, including the risk of bias and reporting standards. We evaluated studies employing ML in dentistry published from 1 January 2015 to 31 May 2021 on MEDLINE, IEEE Xplore, and arXiv. We assessed publication trends and the distribution of ML tasks (classification, object detection, semantic segmentation, instance segmentation, and generation) in different clinical fields. We appraised the risk of bias and adherence to reporting standards, using the QUADAS-2 and TRIPOD checklists, respectively. Out of 183 identified studies, 168 were included, focusing on various ML tasks and employing a broad range of ML models, input data, data sources, strategies to generate reference tests, and performance metrics. Classification tasks were most common. Forty-two different metrics were used to evaluate model performances, with accuracy, sensitivity, precision, and intersection-over-union being the most common. We observed considerable risk of bias and moderate adherence to reporting standards which hampers replication of results. A minimum (core) set of outcome and outcome metrics is necessary to facilitate comparisons across studies.
Extreme learning machine collocation for the numerical solution of elliptic PDEs with sharp gradients
Creators: name: Calabrò, Francesco
name: Fabiani, Gianluca
name: Siettos, Constantinos
Publisher: name: arXiv
Year: 2020
Subjects: subject: Numerical Analysis (math.NA)
subject: FOS: Mathematics

description: We introduce a new numerical method based on machine learning to approximate the solution of elliptic partial differential equations with collocation using a set of sigmoidal functions. We show that a feedforward neural network with a single hidden layer with sigmoidal functions and fixed, random, internal weights and biases can be used to compute accurately a collocation solution. The choice to fix internal weights and bias leads to the so-called Extreme Learning Machine network. We discuss how to determine the range for both internal weights and biases in order to obtain a good underlining approximating space, and we explore the required number of collocation points. We demonstrate the efficiency of the proposed method with several one-dimensional diffusion-advection-reaction problems that exhibit steep behaviors, such as boundary layers. The boundary conditions are imposed directly as collocation equations. We point out that there is no need of training the network, as the proposed numerical approach results to a linear problem that can be easily solved using least-squares. Numerical results show that the proposed method achieves a good accuracy. Finally, we compare the proposed method with finite differences and point out the significant improvements in terms of computational cost, thus avoiding the time-consuming training phase.
The sequential empirical process of a random walk in random scenery
Creators: name: Wendler, Martin
Publisher: name: Technische Universität Dortmund
Year: 2014
Subjects: subject: random walk
subject: empirical process
subject: random scenery
subject: 310
subject: 330
subject: 620

description: A random walk in random scenery (Yn)n2N is given by Yn = Sn for a random walk (Sn)n2N and iid random variables ( (n))n2N. In this paper, we will show the weak convergence of the sequential empirical process, i.e. the centered and rescaled empirical distribution function. The limit process shows a new type of behavior, combining properties of the limit in form independent case (roughness of the paths) and of the long range dependent case (self- similarity).
description: Discussion Paper / SFB 823;32/2014
Assessment of Project Management Maturity on Implementing E-Banking Technology: case study Commercial Bank of Ethiopia
Creators: name: Sheko, Demisha
Publisher: name: National Academic Digital Repository of Ethiopia
Year: 2019

description: manage project. The practice of project management has to be improved to realize its benefits. The main objective of this research project was to assess the project management maturity level of PMO for the successful implementation and contribution on e-banking technologies in CBE. According to the given theories and literature of the maturity assessment that was based on a five level project management maturity model devised by PM Solutions, for assessing the project management practice of the projects nine knowledge areas were selected from the project management body of knowledge guide. The research employed mixed research method and descriptive analyses to realize the purpose of the study. Hence, a questionnaire was devised based on reviewed literature to assess the practice of the knowledge areas. According to the result of the research, it was concluded that most of the knowledge areas were being practiced informally. The maximum level obtained was maturity level three assessed on two knowledge areas (project cost management and project human resource management). Five knowledge areas (project time management, project quality management, project communication management, project risk management and project stakeholder management) had a maturity level of two and the remaining two areas (project scope management and project procurement management) had the lowest maturity level (level one). Lack of proper integration of practices with project management practice has lowered the maturity level of the project management practice at the bank and also leads to its lowest contribution to the successful implementation of e-banking projects even though they have positive relationship. So developing and practicing project management knowledge areas; devising procedure; carefully collecting, compiling and disseminating lessons learned from past project implementation; creating project management standards; and creating awareness among all stakeholders towards projects; strengthening the PMO's human and other resources; and providing trainings in this field have been recommended as a means of improving project management maturity in e-banking technologies so as to practicing and attaining higher project management maturity.
A measurement of proton-carbon forward scattering in a proof-of-principle test of the EMPHATIC spectrometer
Creators: name: Pavin, M.
name: Aliaga-Soplin, L.
name: Barbi, M.
name: Bellantoni, L.
name: Bhadra, S.
name: Ferrazzi, B.
name: Fields, L.
name: Fiorentini, A.
name: Fukuda, T.
name: Gameil, K.
name: Hakim, Y. Al
name: Hartz, M.
name: Jamieson, B.
name: Kiburg, M.
name: Kolev, N.
name: Kawai, H.
name: Konaka, A.
name: Lebrun, P.
name: Lindner, T.
name: Mizuno, T.
name: Naganawa, N.
name: Paley, J.
name: Rivera, R.
name: Santucci, G.
name: Sato, O.
name: Sekiguchi, T.
name: Sikora, A.
name: Slater, G.
name: Suzuki, A.
name: Sugimoto, T.
name: Tabata, M.
name: Uplegger, L.
name: Vladisavljevic, T.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: The next generation of long-baseline neutrino experiments will be capable of precision measurements of neutrino oscillation parameters, precision neutrino-nucleus scattering, and unprecedented sensitivity to physics beyond the Standard Model. Reduced uncertainties in neutrino fluxes are necessary to achieve high precision and sensitivity in these future precise neutrino measurements. New measurements of hadron-nucleus interaction cross sections are needed to reduce uncertainties of neutrino fluxes. We report measurements of the differential cross-section as a function of scattering angle for proton-carbon interactions with a single charged particle in the final state at beam momenta of 20, 30, and 120 GeV/c. These measurements are the result of a beam test for EMPHATIC, a hadron-scattering and hadron-production experiment. The total, elastic and inelastic cross-sections are also extracted from the data and compared to previous measurements. These results can be used in current and future long-baseline neutrino experiments, and demonstrate the feasibility of future measurements by an upgraded EMPHATIC spectrometer.