2,482 research outputs found
RGI-Net: 3D Room Geometry Inference from Room Impulse Responses in the Absence of First-order Echoes
Room geometry is important prior information for implementing realistic 3D
audio rendering. For this reason, various room geometry inference (RGI) methods
have been developed by utilizing the time of arrival (TOA) or time difference
of arrival (TDOA) information in room impulse responses. However, the
conventional RGI technique poses several assumptions, such as convex room
shapes, the number of walls known in priori, and the visibility of first-order
reflections. In this work, we introduce the deep neural network (DNN), RGI-Net,
which can estimate room geometries without the aforementioned assumptions.
RGI-Net learns and exploits complex relationships between high-order
reflections in room impulse responses (RIRs) and, thus, can estimate room
shapes even when the shape is non-convex or first-order reflections are missing
in the RIRs. The network takes RIRs measured from a compact audio device
equipped with a circular microphone array and a single loudspeaker, which
greatly improves its practical applicability. RGI-Net includes the evaluation
network that separately evaluates the presence probability of walls, so the
geometry inference is possible without prior knowledge of the number of walls.Comment: 5 pages, 3 figures, 3 table
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Cardiovascular Disease Risk Factors Related to Shift Work among Korean Workers Aged from 30 to 49 Years
This study was to compare health behaviors between day workers (DW ) and shift workers (SW), and to investigate the cardiovascular disease (CVD) risk factors among 30-49 years Korean workers. SW showed higher prevalence of smoking than DW. The proportion of adequate sleep was lower in SW than in DW. DW showed high.er prevalence of impaired fasting glucose, however, there were no significant differences in hypertension, obesity, hypercholesterolemia, and metabolic syndrome between DW and SW. Further research is recommended to include mediating factors such as organizational culture or working time, etc., for scrutinizing the association between work type and CVD risk factors
Effect of thermal cycling frequency on the durability of Yb-Gd-Y-based thermal barrier coatings
The effects of thermal cycling frequency and buffer layer on the crack generation and thermal fatigue behaviors of YbâGdâY-stabilized zirconia (YGYZ)-based thermal barrier coatings (TBCs) were investigated through thermally graded mechanical fatigue (TGMF) test. TGMF tests with low- (period of 10âŻmin) and high-frequency (period of 2âŻmin) cycling were performed at 1100âŻÂ°C with a 60âŻMPa tensile load. Different cycling frequencies in TGMF test generate two kinds of crack propagation modes. The sample with low-frequency cycling condition shows penetration cracks in the YGYZ top coat, and multiple narrow vertical cracks are generated in high-frequency cycling. To enhance the thermomechanical properties, different buffer layers were introduced into the TBC systems, which were deposited with the regular (RP) or high-purity 8âŻwt% yttria stabilized zirconia (HP-YSZ) feedstock. The purity of the feedstock powder used for preparing the buffer layer affected the fracture behavior, showing a better thermal durability for the TBCs with the HP-YSZ in both frequency test conditions. A finite element model is developed, which takes creep effect into account due to thermal cycling. The model shows the high stresses at the interfaces between different layers due to differential thermal expansion. The failure mechanisms of YGYZ-based TBCs in TGMF test are also proposed. The vertical cracks are preferentially created, and then the vertical and horizontal cracks will be propagated when the vertical cracks are impeded by pores and micro-cracks
The Effect of Negative CSR Information by Luxury Fashion Brands on Consumer Response
Contrary to positive corporate social responsibility (CSR) activities by luxury fashion brands in western countries, little attention has been paid by the same companies to Korean society (FSS, 2012). South Korea is poised to be the next luxury power house in Asia, even overtaking Japan (Luxe Brand Advisors, 2012). Are Korean consumers not as sensitive as western consumers about CSR by luxury fashion brands? To answer these questions, this study explores the effect of negative CSR information by luxury fashion companies on consumer responses
Serum BDNF levels in patients with gambling disorder are associated with the severity of gambling disorder and Iowa Gambling Task indices
Background and aims
Gambling disorder (GD) shares many similarities with substance use disorders (SUDs) in clinical, neurobiological, and neurocognitive features, including decision-making. We evaluated the relationships among, GD, decision-making, and brain-derived neurotrophic factor (BDNF), as measured by serum BDNF levels.
Methods
Twenty-one male patients with GD and 21 healthy sex- and age-matched control subjects were evaluated for associations between serum BDNF levels and the Problem Gambling Severity Index (PGSI), as well as between serum BDNF levels and Iowa Gambling Task (IGT) indices.
Results
The mean serum BDNF levels were significantly increased in patients with GD compared to healthy controls. A significant correlation between serum BDNF levels and PGSI scores was found when controlling for age, depression, and duration of GD. A significant negative correlation was obtained between serum BDNF levels and IGT improvement scores.
Discussion
These findings support the hypothesis that serum BDNF levels constitute a dual biomarker for the neuroendocrine changes and the severity of GD in patients. Serum BDNF level may serve as an indicator of poor decision-making performance and learning processes in GD and help to identify the common physiological underpinnings between GD and SUDs
Crack-Resistance Behavior of an Encapsulated, Healing Agent Embedded Buffer Layer on Self-Healing Thermal Barrier Coatings
In this work, a novel thermal barrier coating (TBC) system is proposed that embeds silicon particles in coating as a crack-healing agent. The healing agent is encapsulated to avoid unintended reactions and premature oxidation. Thermal durability of the developed TBCs is evaluated through cyclic thermal fatigue and jet engine thermal shock tests. Moreover, artificial cracks are introduced into the buffer layerâs cross section using a microhardness indentation method. Then, the indented TBC specimens are subject to heat treatment to investigate their crack-resisting behavior in detail. The TBC specimens with the embedded healing agents exhibit a relatively better thermal fatigue resistance than the conventional TBCs. The encapsulated healing agent protects rapid large crack openings under thermal shock conditions. Different crack-resisting behaviors and mechanisms are proposed depending on the embedding healing agents
Crack-Growth Behavior in Thermal Barrier Coatings with Cyclic Thermal Exposure
Crack-growth behavior in yttria-stabilized zirconia-based thermal barrier coatings (TBCs) is investigated through a cyclic thermal fatigue (CTF) test to understand TBCsâ failure mechanisms. Initial cracks were introduced on the coatingsâ top surface and cross section using the micro-indentation technique. The results show that crack length in the surface-cracked TBCs grew parabolically with the number of cycles in the CTF test. Failure in the surface-cracked TBC was dependent on the initial crack length formed with different loading levels, suggesting the existence of a threshold surface crack length. For the cross section, the horizontal crack length increased in a similar manner as observed in the surface. By contrast, in the vertical direction, the crack did not grow very much with CTF testing. An analytical model is proposed to explain the experimentally-observed crack-growth behavior
Comparison of the characteristics and injury severity of passengers in motor vehicle accidents between urban and rural cities in South Korea
Objective To analyze motor vehicle accidents in two different traffic environments and compare differences in severity between both regions. Methods Injury data were collected by the Emergency Medicine and Traffic Accident Research Team as part of the Korean In-Depth Accident Study. Patients admitted to emergency medical centers located in Wonju, Gangwon province (population 345,143, rural, group A) and Bucheon, Gyeonggi province (population 870,735, urban, group B) between January 2011 and December 2017 were included for analysis. Injury severity was classified into four categories based on Injury Severity Score (ISS): minor (1†Results Overall, 1,807 patients were included (group A, 1,484; group B, 323). There was a higher proportion of daytime accidents, accidents involving larger cars, passenger injuries, and accidents involving lack of seat belt use in group A than in group B. The mean ISS value was 8.98 in group A and 4.62 in group B (P Conclusion Patients in a rural city who visited the emergency room owing to motor vehicle accidents had more severe injuries than those in an urban city
Evolution of optical phonons in CdS nanowires, nanobelts, and nanosheets
We report Raman scattering from single and ensemble CdS nanowires, nanobelts, and nanosheets. The Raman spectra of nanobelts and nanosheets are notably different from those of nanowires, exhibiting a strong enhancement of the multiphonon response. Moreover, the first-order longitudinal optical (LO) phonon energy systematically increases with increasing lateral size from nanowires to nanobelts, and to nanosheets. These results suggest that the optical phonons in the CdS nanostructures are influenced by strain, crystallinity, and exciton-LO phonon coupling.open342
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