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- Title
- GAME THEORY BASED LOCATION-AWARE CHARGING SOLUTIONS FOR NETWORKED ELECTRIC VEHICLES
- Creator
- Laha, Aurobinda
- Date
- 2020
- Description
-
The recent explosive adoption of electric vehicles (EVs) and plug-in hybrid electric vehicles (PHEVs) has sparked considerable interest of...
Show moreThe recent explosive adoption of electric vehicles (EVs) and plug-in hybrid electric vehicles (PHEVs) has sparked considerable interest of academia in developing efficient charging schemes. Supported by the advanced vehicle-to-grid (V2G) network, vehicles and charging stations can respectively make better charging and pricing decisions via real-time information sharing. In this research, we study the charging problem in an intelligent transportation system (ITS), which consists of smart-grid enabled charging stations and networked EVs. Each vehicle aims to select a station with the lowest charging cost by considering the charging prices and its location while the objective of a charging station is to maximize its revenue given the charging strategy of the vehicles. We employ a multileader multi-follower Stackelberg game to model the interplay between the vehicles and charging stations, in which the location factor plays an important role. We show that there exists a unique equilibrium for the followers’ subgame played by the vehicles, while the stations are able to reach an equilibrium of their subgame with respect to the charging prices. Therefore, the Nash equilibrium of the Stackelberg game is achievable through the proposed charging scheme. We further evaluate the price of anarchy (PoA) of the proposed charging scheme by using a centralized optimization model, in which a modified matching algorithm is applied. In state-of-the-art research works, PHEVs tend to charge or discharge to a smart grid individually. In our extended work, we also consider the discharging scenarios for PHEVs, which is generally during the peak hours of a micro-grid system. We propose that by leveraging the cooperation between charging and discharging PHEVs, the grid will be able to properly disperse the charging load in the load valley and discharging during the load peak hours. As a consequence, the electricity load will be well balanced. In this process, the PHEVs also receive greater benefit, thus serving the PHEV charging and discharging cooperation as a win-win strategy for both the grid and the PHEV users. We formulate and resolve the PHEV charging and discharging cooperation in the framework of a coalition game. Finally, simulation results confirm the uniqueness of the equilibrium in both the game strategies. A performance comparison between the proposed distributed and centralized strategy with existing solutions are presented. We also provide the results of the coalition game when both charging and discharging PHEVs are present in the network. The proper management of charging and discharging of EVs poses one of the most challenging and interesting issues in our research. We aim to provide a complete demand response management solution to PHEVs and micro-grids in a real-time scenario.
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- Title
- IMPACT OF DATA SHAPE, FIDELITY, AND INTER-OBSERVER REPRODUCIBILITY ON CARDIAC MAGNETIC RESONANCE IMAGE PIPELINES
- Creator
- Obioma, Blessing Ngozi
- Date
- 2020
- Description
-
Artificial Intelligence (AI) holds a great promise in the healthcare. It provides a variety of advantages with its application in clinical...
Show moreArtificial Intelligence (AI) holds a great promise in the healthcare. It provides a variety of advantages with its application in clinical diagnosis, disease prediction, and treatment, with such interests intensifying in the medical image field. AI can automate various cumbersome data processing techniques in medical imaging such as segmentation of left ventricular chambers and image-based classification of diseases. However, full clinical implementation and adaptation of emerging AI-based tools face challenges due to the inherently opaque nature of such AI algorithms based on Deep Neural Networks (DNN), for which computer-trained bias is not only difficult to detect by physician users but is also difficult to safely design in software development. In this work, we examine AI application in Cardiac Magnetic Resonance (CMR) using an automated image classification task, and thereby propose an AI quality control framework design that differentially evaluates the black-box DNN via carefully prepared input data with shape and fidelity variations to probe system responses to these variations. Two variants of the Visual Geometric Graphics with 19 neural layers (VGG19) was used for classification, with a total of 60,000 CMR images. Findings from this work provides insights on the importance of quality training data preparation and demonstrates the importance of data shape variability. It also provides gateway for computation performance optimization in training and validation time.
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- Title
- A Network Analysis to Examine the Construct of Acculturative Stress in Mexican Americans
- Creator
- Mosqueda, Andrea I
- Date
- 2020
- Description
-
Acculturative stress (AS) is a negative consequence of acculturation and occurs when acculturation is problematic for the individual. There is...
Show moreAcculturative stress (AS) is a negative consequence of acculturation and occurs when acculturation is problematic for the individual. There is a substantial variation in AS phenomena across different cultural/ethnic groups, across individual variables (e.g., sex, age, education, attitude, cognitive style), and across social variables (e.g., contact, social support, status). There does not seem to be one specific way in which AS affects all groups or individuals. Elevated levels of AS are associated with multiple manifest difficulties, including family dysfunction, geographical separation from family, low-income levels, and non-positive expectations for the future. AS has been associated with outcomes such as anxiety, depression, suicidal ideation, and feelings of isolation and alienation. Using a network analysis approach, this exploratory study examined the structure of the construct of AS as represented in the Social, Attitudinal, Familial, and Environmental (SAFE) AS Scale, a measure used to assess the AS construct across four contexts. Results of the network analysis of AS aspects suggest that the AS construct is best understood as a latent variable rather than as a network of interacting AS aspects, and that distress is related to particular aspects of AS. The present study findings suggest a particular model of relations between latent AS, its manifest aspects, and clinical outcomes. Further research can help to better understand the relationship between individual AS aspects (i.e., treatment targets) and treatment goals of impacting AS-related outcomes (e.g., distress), as well as the mechanisms of change.
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- Title
- Technology News, January 08, 1946
- Creator
- Illinois Institute of Technology
- Date
- 1946-01-08, 1946-01-08
- Collection
- Technology News Microfilm collection, 1928-1981
- Title
- Technology News, February 05, 1946
- Creator
- Illinois Institute of Technology
- Date
- 1946-02-05, 1946-02-05
- Collection
- Technology News Microfilm collection, 1928-1981
- Title
- Technology News, January 29, 1946
- Creator
- Illinois Institute of Technology
- Date
- 1946-01-29, 1946-01-29
- Collection
- Technology News Microfilm collection, 1928-1981
- Title
- Technology News, June 04, 1946
- Creator
- Illinois Institute of Technology
- Date
- 1946-06-04, 1946-06-04
- Collection
- Technology News Microfilm collection, 1928-1981
- Title
- Technology News, April 30, 1946
- Creator
- Illinois Institute of Technology
- Date
- 1946-04-30, 1946-04-30
- Collection
- Technology News Microfilm collection, 1928-1981
- Title
- Technology News, June 11, 1946
- Creator
- Illinois Institute of Technology
- Date
- 1946-06-11, 1946-06-11
- Collection
- Technology News Microfilm collection, 1928-1981
- Title
- Technology News, June 18, 1946
- Creator
- Illinois Institute of Technology
- Date
- 1946-06-18, 1946-06-18
- Collection
- Technology News Microfilm collection, 1928-1981
- Title
- Technology News, December 18, 1945
- Creator
- Illinois Institute of Technology
- Date
- 1945-12-18, 1945-12-18
- Collection
- Technology News Microfilm collection, 1928-1981
- Title
- Technology News, January 15, 1946
- Creator
- Illinois Institute of Technology
- Date
- 1946-01-15, 1946-01-15
- Collection
- Technology News Microfilm collection, 1928-1981
- Title
- Technology News, March 11, 1946
- Creator
- Illinois Institute of Technology
- Date
- 1946-03-11, 1946-03-11
- Collection
- Technology News Microfilm collection, 1928-1981
- Title
- Technology News, March 19, 1946
- Creator
- Illinois Institute of Technology
- Date
- 1946-03-19, 1946-03-19
- Collection
- Technology News Microfilm collection, 1928-1981
- Title
- Technology News, April 16, 1946
- Creator
- Illinois Institute of Technology
- Date
- 1946-04-16, 1946-04-16
- Collection
- Technology News Microfilm collection, 1928-1981
- Title
- COMPUTATIONAL MODELLING OF FALLING FILM FLOW AND HEAT TRANSFER OVER HORIZONTAL TUBES
- Creator
- Karmakar, Avijit
- Date
- 2021
- Description
-
In this study, numerical simulations based on the volume of fluid (VOF) method are conducted to investigate the hydrodynamic behavior,...
Show moreIn this study, numerical simulations based on the volume of fluid (VOF) method are conducted to investigate the hydrodynamic behavior, sensible heat transfer behavior, and tube surface wettability effects for a falling film over heated horizontal tubes encountered in falling film heat exchangers. The Reynolds number ranges from 15 - 210, covering the droplet, jet (inline and staggered), and sheet flow modes. To consider evaporation under liquid film waviness and gas (vapor and air) flow effects, a simplified case was studied for the wavy liquid film over a heated vertical surface with the surrounding gas flowing in either co-current or counter-current direction. The OpenFOAM CFD solver has been used to conduct the numerical simulations.For hydrodynamics, the liquid film thickness and interface velocity variation for all the flow modes are presented. In droplet mode, the movement of the liquid waves formed by the drop impact causes an over 350% change in film thickness. A dimple around the jet impingement region in the steady inline jet mode is formed with a relative change in film thickness by 40%. The base of the impinging jets possess ripples of wavelengths 0.3-1.0 times the capillary length. For the steady staggered jet mode, the neighboring jets interact to develop crest and stable segments with film thickness ratio of 1.7. Finally, for the sheet mode, interfacial waves are seen to travel along the tube periphery with amplitudes of about 20% of the nominal film thickness. A set of correlations have been presented to predict film thickness and interfacial velocity with RMSE = 0.2 for 80% of the data.The local Nusselt number (Nu) distribution depends on the flow features in each mode. In the droplet mode, the Nu value varies significantly as the droplet impinges and the remnant liquid-bridge retracts (peak instantaneous Nu = 6), followed by wave propagation with peak Nu = 0.25. For the jet modes, the local maximum in Nu occurs off-center to the impingement location with peak Nu = 3.1 for the inline jet mode and Nu = 2.7 for the staggered jet mode, while for other locations, Nu varies as inversely proportional to film thickness. Substantial variations in the Nu value are also recorded in the middle of the two impinging jets with Nu = 0.95 in the inline jet mode, and Nu = 0.60 in the crest region of the staggered jet mode. In the sheet mode, the Nu varies with the thickness of the traversing liquid waves. Lower Nu values were recorded beneath the crest location of the liquid waves, which increases (1.4 - 11.6%) abruptly at the advancing fronts of the waves. The temperature distribution in the liquid film in each of the modes was examined to evaluate the mechanism of heat transfer process. This study also compares the Nu distribution with the available analytical heat transfer models.The tube surface wettability results present the liquid film thickness, the wetted areas, and the Nusselt number (Nu) over the tube surface. The resistance imposed by the increasing contact angles inhibits the extent of the liquid spreading over the tube surface, and this, in turn, influences film thickness and wetted areas. A significant decrement in the heat transfer rate from the tube surfaces was observed as the equilibrium contact angle increased from 2 to 175 degrees. The local distributions of the Nu over the tube surface are strongly influenced by the flow recirculation in the liquid bulk.Finally, for wavy film evaporation under gas flow effects, the results show a 15% and 16% enhancement in time-averaged Sherwood number (Sh) due to film waviness (sinusoidal and solitary) with gas flow rate, Qg = +50 and Qg = -50, respectively. This enhancement in the Sh for both the waves further increases by 11% with Qg =+800 and by 196% with Qg = -800. Closer examination of the mass transfer process over a wave demonstrates that with Qg = +50, the concentration of the gas side streamlines at the trough locations of the wave leads to higher values of Sh than the rest of the locations. However, with Qg = +800, although the overall Sh increases, vortices appear at the wave trough locations, leading to decreased local Sh values than the surrounding locations.
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- Title
- REVEALING LINGUISTIC BIAS
- Creator
- Karmarkar, Sathyaveer S.
- Date
- 2021
- Description
-
Readers currently face bias in articles written by writers who focus more on partiality towards any person or organization than showing the...
Show moreReaders currently face bias in articles written by writers who focus more on partiality towards any person or organization than showing the real facts. The study aims to detect and reveal such bias against them and try to portray real facts without any partiality against any person or organization. The data is fetched by selecting various articles from Google, especially those containing some bias in them. The bias was checked by measuring the subjectivity and polarity of the article using multiple libraries such as NLTK etc. We created a google form to take readers’ views showing them randomly either the biased article or the improved article after changing bias and getting their opinions.
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