19 research outputs found
Parameter-Aware I/O Management for Solid State Disks (SSDs)
No full textSolid state disks (SSDs) have many advantages over hard disk drives, including better reliability, performance, durability, and power efficiency. However, the characteristics of SSDs are completely different from those of hard disk drives with rotating disks. To achieve the full potential performance improvement with SSDs, operating systems or applications must understand the critical performance parameters of SSDs to fine-tune their accesses. However, the internal hardware and software organizations vary significantly among SSDs and, thus, each SSD exhibits different parameters which influence the overall performance. In this paper, we propose a methodology which can extract several essential parameters affecting the performance of SSDs, and apply the extracted parameters to SSD systems for performance improvement. The target parameters of SSDs considered in this paper are 1) the size of read/write unit, 2) the size of erase unit, 3) the size of read buffer, and 4) the size of write buffer. We modify two operating system components to optimize their operations with the SSD parameters. The experimental results show that such parameter-aware management leads to significant performance improvements for large file accesses by performing SSD-specific optimizations
Association Between Intimate Partner Violence and Suicidal Ideation Among Female and Male Adults in South Korea: A Nationally Representative Longitudinal Study
No full text© The Author(s) 2022.This study sought to assess the prevalence of intimate partner violence (IPV) victimization and to examine the sex-stratified associations between IPV and suicidal ideation in South Korea. This study used nationally representative longitudinal survey data from 2011 to 2020 of the Korean Welfare Panel Study of 9732 married adults at baseline. Participants were annually asked about IPV experiences of verbal abuse, physical threat, or physical assault over the past year in 2011–2019. Suicidal ideation in the past year was assessed in the following year 2012–2020 of IPV experiences. Using multilevel logistic regression models, we examined the associations between IPV and suicidal ideation among married adults. The prevalence of verbal abuse, physical threat, and physical assault was respectively 19.8%, 3.0%, and 1.4% in females (n = 5056); and 18.8%, 2.7%, and 1.0% in males (n = 4676). After adjusting for potential confounders (e.g., lifetime suicidal ideation and random effects of individuals and households) in the same year when participants had IPV experiences, all types of IPV experiences were statistically associated with suicidal ideation in the following year among both females and males, except for physical threat among males. We found a statistically significant association between physical threat and suicidal ideation among females (adjusted odds ratio: 2.22, 95% confidence interval: 1.62, 3.04), whereas no association was observed among males. Our findings suggest that public health interventions related to suicidal behaviors that can be attributable to experiencing IPV are necessary among both females and males in South Korea.N
Multimodal approach to improve fire safety on construction sites
No full textFire risk on construction sites is a threat to property and construction workers’ safety. Fire safety on construction sites has been rarely studied because fire accidents have a lower occurrence compared to Construction’s “Fatal Four”. Despite the lower occurrence, construction fire accidents tend to have a larger severity of impact. To minimize the loss of human life and property, effective fire safety plans should be established on the construction site. This dissertation is composed of three studies. The first study aims at using news media and big data analysis to identify factors related to fire accidents on construction sites. The authors identified the level of media exposure for various keywords related to construction accidents and analyzed the similarities between keywords. The results show that the level of media exposure for fire accidents on construction sites is much higher than for fall accidents, which suggests that fire accidents may have a greater impact on the surroundings than other accidents. The second research was conducted to identify important influencing factors on fire safety on construction sites as well as their relationships through a questionnaire administered to 1,492 fire officers. The authors identified the interrelationships between factors through path analysis and structural equation modeling. The paths of factors showed the highest direct relation between building and fire factors and that the human factor played a mediator role between human and fire factors. The last study aims to provide a BIM-based simulation framework to simulate fire and evacuation performance on construction sites. Computer simulation can be a cost-effective approach for calculating evacuation performance and fire growth on a construction site. To propose a framework, the author analyzes how to apply BIM to fire safety simulations and classifies BIM-based input data required for simulation. This study contributes to the body of knowledge by exploring factors related to fire safety on construction sites and their interrelationships. This study also contributes by effectively integrating fire safety into construction sites and providing practitioners with fire accident analysis data. This study can play an important role in establishing the regulations necessary to improve safety on construction sites
Automated dance motion evaluation using dynamic time warping and Laban movement analysis
No full text
Development of Passively Safe Post Using Momentum Principle and Crushing of Energy Absorbing Module
No full textAbstractRoadside columns exposed to traffic without being properly shielded are severe hazards to the occupant safety of the vehicle impacting to the posts. In the case, passively safe columns should be used. Energy absorbing columns and breakaway ones are the most popular system. In this study, passively safe column of new concept is developed. It consists of a column having a special base plate with a key of inversed T shape and the foundation having guide trough of inversed T shape through which the column base key is inserted keeping the column stands against wind load, but moves in case of an impact. Part of the trough is filled with energy absorbing modules made of circular steel tube stub, which absorbs part of the impact energy remaining after the vehicle and column completes their plastic impact. In this system, energy dissipation takes place in two phases. In the first phase, it dissipates the impact energy by the linear momentum conservation principle while the plastic impact between the post and vehicle takes place, then, the second phase dissipation follows by the deformation of the energy absorbing modules embedded in the guide trough of the foundation. Energy dissipation mechanism is explained and simulations of impacts to the new column system are made using LS-DYNA program to investigate the vehicle response and occupant safety. The simulation results are used in tuning the dimension of the energy absorbing module for an impact of 0.9ton-80km/h. The simulation for the final design of the passively safe column shows its effectiveness to the proposed target impact of 0.9ton-80km/h
Image Evaluation of Magnetization Susceptibility Artifact with the Application of SEMAC by Phase Encoding Step in Magnetic Resonance Imaging: Focus on Phantom Study
No full textSCENE GRAPH FOR DYNAMIC VIRTUAL ENVIRONMENT: SPANGRAPH
No full textInternational audienceThe VRML (Virtual Reality Modeling Language) file format is a popular file format for describing agraphical scene: object shapes, appearance properties, animation, and interactions. However, the formatdoes not provide any mechanism for describing the order of objects’ appearances or their changes overtime. Instead, an interface to Java is offered for controlling the temporal relationships between objectsin the scene.The use of Java makes it difficult for a person with his programming skill to author a dynamicvirtual environment. In this paper we attach a span and an age to each object and their hierarchical andtemporal relations are expressed in a new data structure, called a span graph (SpanGraph). An object inthe span graph, when alive, grows its age and performs associated actions according to its age during theextent of the time span. Furthermore, the object may have child objects whose spans are sub-extents ofthe parent span. In this paper, we demonstrate uses of the SpanGraph in virtual studio and virtualengineering design applications
