bluuebunny/crossref_metadata_2025_split huggingface dataset:
Sleep staging classification based on a new parallel fusion method of multiple sources signals
Authors: Hei Yafang , Yuan Tuming , Fan Zhigao , Yang Bo , Hu Jiancheng 
Published: April 2022

Abstract

Objective. In the field of medical informatics, sleep staging is a challenging and time consuming task undertaken by sleep experts. The conventional method for sleep staging is to analyze Polysomnograms (PSGs) recorded in a sleep lab, but the sleep monitoring with polysomnography (PSG) severely degrades the sleep quality. Despite recent significant progress in the development of automatic sleep staging methods, building a good model still remains a big challenge for sleep studies due to the data-variability and data-inefficiency issues. Electrooculograms (EOGs) and electrocardiograms (ECGs) and are much easier to record and may offer an attractive alternative for home sleep monitoring. PSGs from the Sleep Heart Health Study database were used. This study aims to establish an new automatic sleep staging algorithm by using electrooculogram (EOG) and electrocardiogram (ECG). Approach. First, the heart rate variability (HRV) is extracted from EOG with the Weight Calculation Algorithm and an ‘NRRD’ RR interval detection algorithm. Second, three feature sets were extracted from HRV segments and EOG segments: time-domain features, frequency-domain features and nonlinear-domain features. The frequency domain features and nonlinear-domain features were extracted by using Discrete Wavelet Transform, Autoregressive (AR), and Power Spectral entropy, and Refined Composite Multiscale Dispersion Entropy. Third, a new ‘Parallel Fusion Method’ (PFM) for sleep stage classification is proposed. Three kinds of feature sets from EOG and HRV segments are fused by using PFM. Fourth, Extreme Gradient Boosting (XGBoost) is employed for sleep staging. Main results. Our experimental results show significant performance improvement on automatic sleep staging on the target domains achieved with the new sleep staging approach. The performance of the proposed method is tested by evaluating the average accuracy, Kappa coefficient. The average accuracy of sleep classification results by using XGBoost classification model with PFM is 83% and the kappa coefficient is 0.7. Experimental results show that the performance of the proposed method is competitive with the most current methods and results, and the recognition rate of S1 stage is significantly improved. Significance. As a consequence, it would enable one to improve the quality of automatic sleep staging models when the EOG and HRV signals are fused, which can be beneficial for monitor sleep quality and keep abreast of health conditions. Besides, our study provides good research ideas and methods for scholars, doctors and individuals.
Data-driven analysis of oscillations in Hall thruster simulations
Authors: Maddaloni Davide , Domínguez-Vázquez Adrián , Terragni Filippo , Merino Mario 
Published: April 2022

Abstract
A data-driven modal analysis of plasma oscillations in a stationary plasma thruster-100-like Hall thruster in the 1–120 kHz range is presented. Data are generated by a two-dimensional (axial-radial) hybrid particle-in-cell/fluid simulation code. While proper orthogonal decomposition is unable to successfully uncouple the different dynamics, higher order dynamic mode decomposition (HODMD) cleanly isolates the breathing and ion transit time (ITT) modes. Indeed, the computed HODMD components can be clustered into two distinct groups, enabling the separate reconstruction of the dynamics of the two oscillation modes. It is also shown that each plasma variable exhibits a different behavior in each cluster. The breathing oscillations have a global or standing-wave character for the plasma density, neutral density and ion current density inside the thruster, and an axially progressive-wave structure for the electron temperature and plasma potential in the near plume. The ITT mode shows a progressive-wave structure for all variables, except for the neutral density whose amplitude is negligible. This work serves as an illustration of the applicability of data-driven techniques like HODMD to the analysis of plasma flows relevant to electric propulsion.
Anomalous flux periodicity in proximitised quantum spin Hall constrictions
Authors: Vigliotti Lucia , Calzona Alessio , Trauzettel Björn , Sassetti Maura , Ziani Niccolò Traverso 
Published: April 2022

Abstract
We theoretically analyse a long constriction between the helical edge states of a two-dimensional topological insulator. The constriction is laterally tunnel-coupled to two superconductors and a magnetic field is applied perpendicularly to the plane of the two-dimensional topological insulator. The Josephson current is calculated analytically up to second order in the tunnel coupling both in the absence and in the presence of a bias (DC and AC Josephson currents). We show that in both cases the current acquires an anomalous 4π-periodicity with respect to the magnetic flux that is absent if the two edges are not tunnel-coupled to each other. The result, that provides at the same time a characterisation of the device and a possible experimental signature of the coupling between the edges, is stable against temperature. The processes responsible for the anomalous 4π-periodicity are the ones where, within the constriction, one of the two electrons forming a Cooper pair tunnels between the two edges.
Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs4Sb12
Authors: Götze K , Pearce M J , Coak M J , Goddard P A , Grockowiak A D , Coniglio W A , Tozer S W , Graf D E , Maple M B , Ho P-C , Brown M C , Singleton J 
Published: April 2022

Abstract
CeOs4Sb12, a member of the skutterudite family, has an unusual semimetallic low-temperature

L

-phase that inhabits a wedge-like area of the field H—temperature T phase diagram. We have conducted measurements of electrical transport and megahertz conductivity on CeOs4Sb12 single crystals under pressures of up to 3 GPa and in high magnetic fields of up to 41 T to investigate the influence of pressure on the different H–T phase boundaries. While the high-temperature valence transition between the metallic

H

-phase and the

L

-phase is shifted to higher T by pressures of the order of 1 GPa, we observed only a marginal suppression of the

S

-phase that is found below 1 K for pressures of up to 1.91 GPa. High-field quantum oscillations have been observed for pressures up to 3.0 GPa and the Fermi surface of the high-field side of the

H

-phase is found to show a surprising decrease in size with increasing pressure, implying a change in electronic structure rather than a mere contraction of lattice parameters. We evaluate the field-dependence of the effective masses for different pressures and also reflect on the sample dependence of some of the properties of CeOs4Sb12 which appears to be limited to the low-field region.
Consequences of electric charge on anisotropic hyperbolically symmetric static spacetime
Authors: Yousaf Z , Bhatti M Z , Asad H 
Published: April 2022

Abstract
The investigation of hyperbolically symmetric sources under the impact of electromagnetic field is conducted in this paper, with a focus on the fluid distributed in static spacetime. To do this, we choose the metric f(R) gravity. It is observed that the fluid does not have the capacity to occupy the space surrounding the center, meaning that it exhibits cavity around the core. Furthermore, calculating the energy density indicates that it is invariably negative in the presence of correction terms, which might be crucial in comprehending certain quantum field occurrences, due to the fact that negative energies are directly tied with the quantum field theory. In this modified gravity, we implement the orthogonal splitting of the curvature tensor and derive the structure scalars. Following that, some cosmological models exhibiting the hyperbolical symmetry as well as their substantial determinants are investigated using two generating functions. The model of less-complex relativistic system of Einstein gravity is offered to explore precisely the role of f(R) terms under the influence of electromagnetic field.
Observation of two-step aggregation kinetics of amyloid-β proteins from fractal analysis
Authors: Mukhopadhyay Soham , Bera Subhas C , Ramola Kabir 
Published: April 2022

Abstract
Self-aggregation in proteins has long been studied and modeled due to its ubiquity and importance in many biological contexts. Several models propose a two step aggregation mechanism, consisting of linear growth of fibrils and secondary growth involving branch formation. Single molecule imaging techniques such as total internal reflection fluorescence (TIRF) microscopy can provide direct evidence of such mechanisms, however, analyzing such large data-sets is challenging. In this paper, we analyze for the first time, images of growing amyloid fibrils obtained from TIRF microscopy using the techniques of fractal geometry, which provides a natural framework to disentangle the two types of growth mechanisms at play. We find that after an initial linear growth phase, identified by a plateau in the average fractal dimension with time, the occurrence of branching events leads to a further increase in the fractal dimension, with a final saturation value

≈
2

. This provides direct evidence of the two-step nature of the aggregation kinetics of amyloid-β proteins, with an initial linear elongation phase followed by branching at later times.
The effect of long-term heating on the tritium adsorption and desorption behavior of advanced core–shell breeding materials
Authors: Chen Ruichong , Katayama Kazunari , Ipponsugi Akito , Oyama Ran , Guo Hao , Qi Jianqi , Liao Zhijun , Lu Tiecheng 
Published: April 2022

Abstract
In order to efficiently grasp the tritium behavior in advanced core–shell breeding materials, this study adopts a route of injecting tritium out-of-pile to deal with the problems of fewer platforms, long periods, and high costs for traditional neutron irradiation-tritium release experiments. Here, tritium adsorption and desorption experiments were carried out with Li4TiO4–Li2TiO3 core–shell breeding materials before and after long-term heating up to 30 days. The purpose is to study whether the structural changes caused by long-term heating will affect the adsorption and desorption behavior of tritium on the sample surface. The results show that the lack of chemically adsorbed water caused by long-term heating will significantly weaken the tritium adsorption capacity of the sample, but will not affect the desorption behavior of Ar, 1% H2 + Ar and water vapor on tritium, so all samples show a very low tritium retention.
Sawdust and soil block as wall in simple buildings to gain the optimum heat and embodied energy in humid tropical area
Authors: Noerwasito V T 
Published: April 2022

Abstract
Red bricks are widely used in Indonesia. The process of making red brick itself causes many problems such as the combustion process and the creation of air pollutant during the production process. On the other hand, waste from timber industry in Indonesia, which is called sawdust, becomes a problem that need to be solved by the woodcraft industry. Therefore, this study aims to substitute the use of red brick as wall material as well as reducing the waste of woodcraft industry by mixing sawdust waste with clay and cement as an alternative. The purpose of this study is investigating the performance of sawdust as wall material in terms of heat transfer and embodied energy in buildings compared to red brick. This study aims to analyse the optimum composition of sawdust as wall material to gain a balanced heat and embodied energy in simple housing. The study investigates sawdust wall in building with the size of 36m2 by using simulation software called Archipak. The embodied energy calculation uses standard embodied energy per unit. The research variable is the thickness of sawdust walls. The result of this study is the thickness of sawdust wall with minimum heat transfer and embodied energy.
Experimental study on CO2 concentration and indoor thermal comfort pf different classrooms during new normal in the University of Kitakyushu
Authors: Sekartaji D , Sakai N , Novianto D , Ryu Y 
Published: April 2022

Abstract
Indoor thermal comfort and indoor air quality in educational buildings are essential for students’ health and learning performance. In this pandemic situation, regulation of door and ventilation opening in the classroom for offline class become important for infection spread prevention. Based on Japan Ministry of Health, Labour and Welfare standard, CO2 concentration level shall not exceed 1,000 ppm to prevent infection spreading. Yet significant amount of door and ventilation opening may reduce the level of thermal comfort because the Air-conditioning leakage. This study aims to evaluate CO2 concentration and indoor thermal comfort in two classrooms with door and ventilation opening regulation. In this study, the experimental measurements conducted in spring and summer season in The University of Kitakyushu. The method used in this study is by measuring air temperature, relative humidity, and CO2 concentration. The research results are expected to be a reference for the optimal application of regulations for thermal comfort and infection spread prevention.
Analysis study of light shelves, light pipes, mirror ducts utilization and implementation in Indonesia
Authors: Rumondang E S , Regina Y V , Angela Y R , Larasati D 
Published: April 2022

Abstract
This research was conducted because of the issue of exhaustible energy in Indonesia, particularly in the architecture and construction division. One of the methods to reduce energy-use in buildings is by using passive lighting techniques. This research examined several types of passive lighting techniques to determine the advantages and disadvantages of this type of lighting, as well as their implementation in Indonesia. Three types of passive lighting that will be analyzed in this study are light pipes, mirror ducts, and light shelves. Literature studies and precedents are used as a comparison for analysing the types of passive lighting and as precedents to determine the variables and parameters in the simulation. Simulations are carried out to calculate effectiveness based on the parameters that have been chosen. In addition, a survey in the form of a questionnaire was conducted to see the preferences and implementation of passive lighting among practitioners in the architectural field in Indonesia. This research is expected to be a source of information and can be used by architects to understand more deeply about passive lighting and its effect on the energy efficiency of buildings.
Sustainability principle in Nusantara architecture: case study of the Tongkonan House, the Betawi Stage House, the Gadang House, and Lamin House
Authors: Nabilunnuha M B , Hervanda S , Xian G E , Tjong A , Indarti F R , Nuffida N E , Ardhyanto A , Novianto D 
Published: April 2022

Abstract
This study aims to analyze and identify the principles of sustainability in case studies of several traditional Indonesian architectures, or more specifically known as Nusantara Architecture. This paper discussed the identification, application of principal thinking, analysis, and observation through literature review and hypothesis. In these three case studies, which are the Tongkonan House, Panggung Betawi House, and Gadang House, we found that each building was represented by the choice of forms, materials, functions, and structures, which used the local resources, and as well as the meaning of architectural elements found in the details. During the modernization, the characteristics of the Nusantara Classical Architecture began to be applied to the current architecture which emerged as the Nusantara Contemporary Architecture. Through this paper, we encourage the complexity of architectural design knowledge that reflect the genius-logic, technological development, identity, lifestyle, ethical and aesthetic values of the Indonesian, which have been developed by the ancestors and it is important to always become a consideration and precedent for the architects, planners, and decision-makers in the future.
Imputation of missing values for generating typical meteorological year (TMY) with data decomposition and recurrent neural networks
Authors: Chreng K , Lee H S , Pradana R P , Trong T Q , Arya Putra I D G , Nimiya H 
Published: April 2022

Abstract
Typical meteorological year (TMY) for a specific location is critical information when designing low-carbon and energy-saving buildings. However, in developing countries, long-term observations of weather are now readily available and even mixed with missing values. In this study, a nonlinear autoregressive (NAR) recurrent neural network model in combination with improved complete ensemble empirical mode decomposition with adaptive noise (ICEEMDAN) method is demonstrated for treating the missing values in observed daily average air temperature at Bogor City in Indonesia. The prediction results for missing values indicate that the ICEEMDAN-NAR hybrid model performs very well with high accuracy when compared with the observed in the validation and model comparison phases. Particularly, the relatively lower frequency oscillation modes in observed data can be predicted well. Thus, this method can be used for relatively medium- and long-term prediction of missing values with respect to the given data/input period. critical to consider cities and buildings from the eyes of older people in society.
A strategy of a masterplan of Landak general hospital: a study of architectural programming
Authors: Alhamdani M R , Sari D P 
Published: April 2022

AbstractThe plan for the development of the Landak District General Hospital is motivated by three things, namely the first from the mandate of law concerning hospitals, secondly the development of the Landak Regency in line with population growth, and the increasing demand and third the need for health services that occur in health centres. The aims of this research are to prepare of the initial stage of the Masterplan of the Landak District Hospital, for obtaining a harmonious and balanced use of regional space with the needs and capabilities of supporting urban growth and development by taking into account the harmony of the environment, the availability of a regional development plan that can function as a forum for integration for the interests of all parties. The results are the strategy of master plan development of Landak general hospital viewed from architectural programming namely activity patterns, zoning formation, space requirements, functional relationship, circulation patterns, building security and safety, landscape and open space, and parking requirements.
Defective Placentation Syndromes and Intellectual Disability in the Offspring: Nationwide Cohort and Sibling-Controlled Studies
Authors: Villamor Eduardo , Susser Ezra S , Cnattingius Sven 
Published: April 2022

Abstract
We investigated the relationships between syndromic manifestations of defective placentation and the incidence of intellectual disability (ID) in offspring by conducting a population-based cohort study of 1,581,200 nonmalformed, live singleton infants born in Sweden between 1998 and 2014. Exposures were: 1) placental abruption, 2) preterm preeclampsia (&lt;34 weeks of gestation), 3) preeclampsia combined with infant being small for gestational age (SGA) at birth, and 4) spontaneous preterm birth. The outcome was an ID diagnosis after 3 years of age. We estimated hazard ratios (HRs) and 95% confidence intervals (CIs) for each syndrome using Cox regression and robust variances. There were 9,451 children with ID (5.5 per 10,000 child-years). ID incidence rates increased with placental abruption (HR = 2.8, 95% CI: 2.3, 3.5), preterm preeclampsia (HR = 3.7, 95% CI: 2.9, 4.7), preeclampsia combined with SGA (HR = 3.3, 95% CI: 2.6, 4.1), and spontaneous preterm birth (for 32–36 and 22–31 weeks, respectively, HR = 1.6 (95% CI: 1.4, 1.8) and 5.2 (95% CI: 4.3, 6.2)). The same pattern of results was evident in sibling-controlled analyses among 1,043,158 full siblings. The strength of associations increased with ID severity. Preterm birth only partly explained the associations of placental abruption, preeclampsia, or SGA with ID. We conclude that defective placentation is related to increased incidence of ID in the offspring.
Evolving Clinical Experiences in Aesthetic Hip Implant Body Contouring
Authors: Troell Robert J , Eppley Barry , Javaheri Shahin 
Published: April 2022

AbstractBackgroundHip augmentation increases the hip width utilizing fat transfer and/or subcutaneous implants, creating a more feminine hourglass shape. Custom hip implant surgery requires proper patient selection, correct body frame analysis, appreciation of hip aesthetics, understanding surgical anatomy, optimal aesthetic planning, a favorable implant design and fabrication, skilled surgical implant placement, diligent postoperative patient care, and proper complication management.ObjectivesThe authors sought to evaluate the pioneering clinical experience with cosmetic custom hip silastic implants.MethodsA consecutive patient surgical series of patients seeking custom aesthetic hip implant surgery was tabulated. Similar hip analysis, implant design and fabrication, surgical technique, and postoperative follow-up were performed in 3 practices.ResultsThe overall patient satisfaction rate (87%, 47 of 54 patients) was favorable. There was a total of 29 (54%) medical complications and 20 (37%) cosmetic complications (implant show). A total of 17 patients (31.5%) requested revision surgery secondary to implant show (n = 10) and an infected implant (n = 6). No patient experienced an acute implant infection, incisional scar hypertrophy, wound dehiscence, implant extrusion, parasthesias, muscle dysfunction, or hip joint injury.ConclusionsThe utilization of hip implants represents a new type of body contouring implant that has some unique differences in anatomic location, implant design, and tissue pocket location. Their utilization is an evolving one in aesthetic body implants, for which clinical experience to date remains limited in number. The proper surgical placement, postoperative management, and treatment of complications to include revision surgery are essential to achieving a successful body contouring outcome.Level of Evidence: 4