180 research outputs found
User relay assisted traffic shifting in LTE-advanced systems
No full textIn order to deal with uneven load distribution, mobility load balancing adjusts the handover region to shift edge users from a hot-spot cell to the less-loaded neighbouring cells. However, shifted users suffer the reduced signal power from neighbouring cells, which may result in link quality degradation. This paper employs a user relaying model and proposes a user relay assisted traffic shifting (URTS) scheme to deal with the above problem. In URTS, a shifted user selects a suitable non-active user as relay user to forward data, thus enhancing the link quality of the shifted user. Since the user relaying model consumes relay user’s energy, a utility function is designed in relay selection to reach a trade-off between the shifted user’s link quality improvement and the relay user’s energy consumption. Simulation results show that URTS scheme could improve SINR and throughput of shifted users. Also, URTS scheme keeps the cost of relay user’s energy consumption at an acceptable level
Time will tell: a longitudinal examination of interest congruence with educational and work environments
No full textTheories of person-environment (P-E) fit describe the interaction between persons and environments as a dynamic process that changes over time. In particular, theories refer to an adjustment process by which the degree of P-E fit should improve over time due to adaptations of a person’s attributes to fit their environment, changes in the environment itself, or both. Despite the changing dynamics of fit forming the central aspect of several theoretical perspectives, these ideas have largely gone untested. The present dissertation is an empirical examination of changes in fit over time between individuals and career-related environments during a critical period of transition from education into the workforce. This longitudinal study is a within-person test of changes in interest congruence in two Icelandic samples that allowed for an examination of whether or not fit improves over time and the drivers of fit change. Several methods were used to capture interest congruence over time: growth models of profile correlations between person and environment interests, longitudinal latent congruence models based on a structural equation modeling framework, person and environment latent difference scores, and piecewise growth models to examine interest development before and after environmental changes. Each of these methods used a slightly different lens to understand how interest congruence changes over time with respect to educational and work domains. Across these methods, three sets of results were typically found: (1) interest congruence improved over time in both types of environments, (2) participants’ interests sometimes changed in response to their environment, and (3) educational and work changes often followed from changes in participants’ interests. Implications of these findings for theoretical development and practice are discussed.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2022-05-01The student, Lexi Hanna, accepted the attached license on 2020-05-05 at 10:50.The student, Lexi Hanna, submitted this Dissertation for approval on 2020-05-05 at 10:59.This Dissertation was approved for publication on 2020-05-05 at 14:21.DSpace SAF Submission Ingestion Package generated from Vireo submission #15214 on 2020-08-25 at 17:42:56Made available in DSpace on 2020-08-27T00:51:23Z (GMT). No. of bitstreams: 3
HANNA-DISSERTATION-2020.pdf: 1381609 bytes, checksum: ea6f218b990a3259a3a96117f0afa3bb (MD5)
LICENSE.txt: 4207 bytes, checksum: d83725daad9d0f50291c65d2ef464180 (MD5)
PROQUEST_LICENSE.txt: 4553 bytes, checksum: 81f8a515911fea041fb659ebebf2ccd1 (MD5)
Previous issue date: 2020-05-05Embargo set by: Seth Robbins for item 115927
Lift date: 2022-08-27T00:51:40Z
Reason: Author requested closed access (OA after 2yrs) in Vireo ETD systemAuthor requested closed access (OA after 2yrs) in Vireo ETD systemLimite
Characteristics of debris flow development in Daxilada watershed and its hazard analysis on Lexi Expressway
No full textAbstract The occurrence of frequent debris flow catastrophes in the mountainous regions of southwest China has necessitated the inclusion of debris flow disaster analysis and prevention as an essential component in the planning and construction of mountainous roadways. Daxilada watershed is located in the south of Mabian Yi Zuzizhixian, Leshan City, Sichuan Province, and the proposed Leshan-Xichang Expressway (Lexi Expressway) will pass through the upper reaches of Daxilada watershed. It is essential to consider that the presence of debris flows within the Daxilada watershed could have detrimental effects on the construction and functionality of the proposed Luoshanxi Bridge. This study examined the Daxilada watershed as a case study and analyzed the factors contributing to debris flow formation in the area. This analysis was based on field investigations, remote sensing interpretation, and experimental analysis. Additionally, the study utilized the Massflow software to simulate debris flow movement. It integrated the simulation results to determine the potential hazards the Daxilada Gully debris flow posed to the line project. This study found that Daxilada Gully meets debris flow formation conditions. The simulation results demonstrated that during the debris flow activity, there would be a maximum deposition depth of 2.1 m in the proposed Engineering Agency, which may lead to siltation and blocking disaster of the line project. Concerning the parameters related to the debris flow with a frequency of one in a hundred years, in conjunction with the outcomes obtained from numerical simulation, it would provide the design basis of the cross-flow cross-section of the proposed bridge. In a quantitative analysis of the blockage situation in the gully, debris flow deposits have the potential to cause damage to the line project. Debris flow deposits block the gully, but the risk of blockage is small. The study results have specific reference values for the debris flow prevention and control project of Lexi Expressway and offer valuable insights for the prevention and mitigation of similar disasters in relative projects
Presence in Language: Tracing the Relationship of Text and Space in Contemporary Chinese Art
No full textThe thesis focuses on three artists who represent the origins, expansion, and future of text-based spatiality in contemporary Chinese art. Each artist, Gu Wenda (born 1955), Tao Aimin (born 1974), and Xu Bing (born 1955), proposes ways of conceptualizing text-based art derived from the rejection of artistic calligraphic tradition in the 1980s New Wave. Gu Wenda’s pseudo-text installation Babel of the Millennium consumes its architecture and fortifies a literalized interior space which relates to his conversation around geopolitical collectivization, and China’s modernization with growing international artistic presence in the 90s. Tao Aimin uses space to recognize the textual narrative embedded in the materiality of her installation River of Women and opens possibilities of documenting history during the era of China’s expanding domestic art market. Xu Bing defies the space in his Gravitational Arena installation by perceiving Buddhist philosophical space while bridging new discourse on technology, China’s cyber space, and the world’s future. These works engage with the global study on the interaction between space and text, and their relationship with viewer’s experience, through which meanings are generated and negotiated.</p
Presence in Language: Tracing the Relationship of Text and Space in Contemporary Chinese Art
No full textThe thesis focuses on three artists who represent the origins, expansion, and future of text-based spatiality in contemporary Chinese art. Each artist, Gu Wenda (born 1955), Tao Aimin (born 1974), and Xu Bing (born 1955), proposes ways of conceptualizing text-based art derived from the rejection of artistic calligraphic tradition in the 1980s New Wave. Gu Wenda’s pseudo-text installation Babel of the Millennium consumes its architecture and fortifies a literalized interior space which relates to his conversation around geopolitical collectivization, and China’s modernization with growing international artistic presence in the 90s. Tao Aimin uses space to recognize the textual narrative embedded in the materiality of her installation River of Women and opens possibilities of documenting history during the era of China’s expanding domestic art market. Xu Bing defies the space in his Gravitational Arena installation by perceiving Buddhist philosophical space while bridging new discourse on technology, China’s cyber space, and the world’s future. These works engage with the global study on the interaction between space and text, and their relationship with viewer’s experience, through which meanings are generated and negotiated.</p
Contrasting Stratospheric Aerosol Injection Geoengineering with Greenhouse Gas Emission Cuts in Mitigating Human Thermal Stress Globally
No full textGreenhouse gas-induced climate change is ongoing, increasingly causing heat-related illness, suffering, and death. While carbon emission reduction is recognized as the main approach of mitigation, geoengineering as an emergency response has gained stronger interests in recent years. Stratospheric Aerosol Injection (SAI) is one proposed method of geoengineering to mitigate rising temperatures in the future decades.
Previous studies on SAI have primarily focused on the impacts on surface temperature and precipitation but have lacked a direct and rigorous assessment of human thermal stress indicators, arguably more relevant to the health outcome of vulnerable populations globally.
Using CESM2-WACCM6 model simulation over the period of 2020 ��� 2100 from CMIP6���s ScenarioMIP and GeoMIP projects, this paper investigates the spatial and temporal evolution of temperatures and a suite of 5 heat indices under a decarbonization emission pathway (SSP245) and an SAI scenario (G6sulfur), relative to the baseline a climate scenario of continued fossil fuel economic development (SSP585). These indices are carefully chosen to embody the meteorological influence via temperature, humidity, solar radiation, and wind speed.
We find that the SAI scenario does a comparably good job of cooling global average temperatures and heat indices, as SSP245. For example, in 2100, the temperature would be cooler than SSP585 by 3.1��C in the SAI scenario, and 3.3��C in the decarbonization pathway.
However, the cooling is not projected to be uniform across global land regions. For example, the North American region would have stronger cooling benefits under SAI, while regions such as Australia would suffer more under SAI than decarbonization. Therefore, the global disparity of climate impacts are widened rather than reduced.
More importantly, the heat relief when quantified using ESI and AT indices shows even larger disparity enhancement, possibly due to an enhancement of the polar vortex in the Northern Hemisphere, which has been observed during previous large volcanic eruptions stemming from ozone depletion, stratospheric heating, and a decrease in temperature gradient. This impact has not been seen in the Southern Hemisphere, which can lead to disparities in the ability of SAI to evenly distribute cooling effects
Contrasting Stratospheric Aerosol Injection Geoengineering with Greenhouse Gas Emission Cuts in Mitigating Human Thermal Stress Globally
No full textGreenhouse gas-induced climate change is ongoing, increasingly causing heat-related illness, suffering, and death. While carbon emission reduction is recognized as the main approach of mitigation, geoengineering as an emergency response has gained stronger interests in recent years. Stratospheric Aerosol Injection (SAI) is one proposed method of geoengineering to mitigate rising temperatures in the future decades.
Previous studies on SAI have primarily focused on the impacts on surface temperature and precipitation but have lacked a direct and rigorous assessment of human thermal stress indicators, arguably more relevant to the health outcome of vulnerable populations globally.
Using CESM2-WACCM6 model simulation over the period of 2020 ��� 2100 from CMIP6���s ScenarioMIP and GeoMIP projects, this paper investigates the spatial and temporal evolution of temperatures and a suite of 5 heat indices under a decarbonization emission pathway (SSP245) and an SAI scenario (G6sulfur), relative to the baseline a climate scenario of continued fossil fuel economic development (SSP585). These indices are carefully chosen to embody the meteorological influence via temperature, humidity, solar radiation, and wind speed.
We find that the SAI scenario does a comparably good job of cooling global average temperatures and heat indices, as SSP245. For example, in 2100, the temperature would be cooler than SSP585 by 3.1��C in the SAI scenario, and 3.3��C in the decarbonization pathway.
However, the cooling is not projected to be uniform across global land regions. For example, the North American region would have stronger cooling benefits under SAI, while regions such as Australia would suffer more under SAI than decarbonization. Therefore, the global disparity of climate impacts are widened rather than reduced.
More importantly, the heat relief when quantified using ESI and AT indices shows even larger disparity enhancement, possibly due to an enhancement of the polar vortex in the Northern Hemisphere, which has been observed during previous large volcanic eruptions stemming from ozone depletion, stratospheric heating, and a decrease in temperature gradient. This impact has not been seen in the Southern Hemisphere, which can lead to disparities in the ability of SAI to evenly distribute cooling effects
Cardiovascular Risk with Non-Steroidal Anti-Inflammatory Drugs: Systematic Review of Population-Based Controlled Observational Studies
No full textThis is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
Coded Excitation for Doppler Ultrasound Imaging of The Brain
No full textDoppler ultrasound imaging of cerebral blood flow faces challenges arising from a low signal-to-noise ratio (SNR) and a wide dynamic range. Echo signals received from blood cells are significantly weaker compared to surrounding tissues, such as the skull or brain soft tissue, resulting in inhibited visualization of small blood vessels and deep brain areas. To address this issue, this thesis explored the feasibility of employing and improving coded excitation techniques to enhance the SNR of Doppler ultrasound images. Furthermore, an optimized code for Doppler ultrasound imaging is designed, represented by a generalized encoding matrix. The research begins with the definition of a linear signal model that incorporates the encoding matrix. Subsequently, a trace-constraint optimization problem is formulated based on maximizing the Fisher information matrix to find the optimized encoding matrix. The feasibility and performance of the optimized encoding matrix are assessed through simulations on both small and large array settings, which operate above Nyquist sampling frequency and under Nyquist sampling frequency respectively. The imaging results indicate that the optimized code exhibits higher SNR in deep image regions compared to existing coded excitation methods like Barker code while using the same number of transmissions, bit length, and same average transmit energy, albeit with a trade-off of decreased axial resolution. Nonetheless, this resolution degradation can be mitigated through the application of the iterative imaging technique LSQR. Finally, the optimized code is tested in a clinical transducer setting, and a blood flow simulation is conducted. The outcomes showcase the capacity of the proposed optimized code to enable higher SNR in Doppler ultrasound imaging and more accurate and informative clinical assessments.Electrical Engineering | Signals and System
- …
