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Articles 2521 - 2550 of 74067
Full-Text Articles in Entire DC Network
Optimizing Mars Terrain Segmentation With Weakly Supervised Learning: A Focus On Weighted Loss From Annotation Metadata, Malika Dutta
Optimizing Mars Terrain Segmentation With Weakly Supervised Learning: A Focus On Weighted Loss From Annotation Metadata, Malika Dutta
Theses and Dissertations
The study of planetary surfaces heavily depends upon space rovers that gather detailed images of terrain needed for analysis and navigation. Deep neural networks and other sophisticated machine learning techniques are necessary for autonomous navigation in challenging terrain. However, the inconsistent annotations by citizen scientists frequently hinder the performance of these models. This study seeks to optimize terrain segmentation to improve the autonomous capabilities of future Mars rovers by presenting a novel weakly supervised learning framework to handle noise and unreliability in datasets. Using factors like number of clicks, pixel accuracy, and annotator dependability, the method utilizes annotation metadata in …
Bucket-Based Priority Queues For A* And Related Bounded-Suboptimal And Anytime Search Algorithms: Theoretical And Practical Advancements, Garrett Michael Fereday
Bucket-Based Priority Queues For A* And Related Bounded-Suboptimal And Anytime Search Algorithms: Theoretical And Practical Advancements, Garrett Michael Fereday
Theses and Dissertations
For shortest-path problems with a small number of integer transition costs, it is well-known that the performance of the classic A* algorithm can be improved by using bucketing to reduce priority queue overhead—in particular, by using a bucket queue data structure for the priority queue, instead of a binary heap. This dissertation describes several theoretical and practical extensions of this approach. First, the traditional two-level bucket queue data structure is modified in simple ways to improve the worst-case complexity of its operations, which leads to the first demonstration that the priority queue operations of a two-level bucket queue for A* …
Assessment Of Pagp Gene Function In Avian Pathogenic Escherichia Coli Pathogenicity Using Different Challenge Models, Hailey Fugate
Assessment Of Pagp Gene Function In Avian Pathogenic Escherichia Coli Pathogenicity Using Different Challenge Models, Hailey Fugate
Theses and Dissertations
Avian pathogenic Escherichia coli (APEC) is a leading cause of morbidity and mortality in poultry, contributing an estimated $40 million in annual losses in the U.S. broiler industry alone, and contributing to growing concerns over antibiotic resistance. This study investigated the role of the pagP gene, which encodes a lipid A palmitoyl transferase involved in immune evasion, using both a broiler chick and embryo challenge model. Deletion of pagP significantly reduced mortality and lesion severity in broilers, indicating its role in APEC pathogenicity. However, in embryos, pagP deletion had minimal effects on survival and bacterial colonization, suggesting alternative virulence mechanisms …
Investigating Structure-Property Relationships Of Bio-Inspired Gel, Mohammad Moinul Hossain
Investigating Structure-Property Relationships Of Bio-Inspired Gel, Mohammad Moinul Hossain
Theses and Dissertations
High-modulus, stretchable, and resilient hydrogels possess a wide array of promising applications across multiple fields, such as the development of sophisticated prosthetic devices, artificial skin, electronic devices, and soft robotics. Elastomeric biopolymers, like resilin, show high stretchability and resilience, facilitating power-amplified movement in various species essential for feeding and defense mechanisms. To mimic the properties of resilin, we developed a hydrogel system of hydrophobic and hydrophilic components. These gels are synthesized by free radical polymerization of acrylic acid (AAc), methacrylamide (MAM), n-tert-beutylacrylamide (BAM) or n-isopropylacrylamide (NIPAM), and poly (propylene glycol) diacrylate (PPGDA). This research aims to compare the large-strain mechanical …
Wildfire Hydrologic Impacts, Kathleen E. Inman
Wildfire Hydrologic Impacts, Kathleen E. Inman
Theses and Dissertations
Wildfires are essential processes for certain ecosystems but are increasing in severity and occurrence. These increases are negatively changing hydrology. Anticipating the hydrologic changes is necessary for management of effected watersheds, infrastructure, and downstream users. This study hypothesized land cover changes post-fire would increase water temperature and discharge in burned watersheds located in the Willamette Basin. This study (1) evaluated the change in estimated curve numbers (CN) from land cover pre-fire and post-fire to assess expected runoff impacts in watersheds, and (2) identified the significance of actual water temperature and discharge changes using non-parametric statistical analysis. An unburned watershed and …
The Effect Of Dexmedetomidine On The Frequency Of Ureteral Jets Detected In Dogs Using Standard Brightness Mode Ultrasonography, Leonard E. Jordan Ii
The Effect Of Dexmedetomidine On The Frequency Of Ureteral Jets Detected In Dogs Using Standard Brightness Mode Ultrasonography, Leonard E. Jordan Ii
Theses and Dissertations
Ultrasonography can be used in dogs to visualize urine entering the urinary bladder (ureteral jets) to determine whether urine enters the bladder normally. Dexmedetomidine is an alpha-2 adrenergic agonist used for chemical restraint and has diuretic properties. The purpose of this study is to evaluate the effect of dexmedetomidine on the number of jets detected using B-mode ultrasonography. We hypothesized: that intravenous administration of dexmedetomidine would cause increased numbers of jets; that jets would increase with increasing doses of dexmedetomidine and length of sedation. Compared to baseline, increases in observed jets occurred at 30- and 40-minutes post 3 mcg/kg (p=0.042 …
Finite Element Analysis Of Hydroxyapatite (Ha) Coated Porous We43 Magnesium Scaffolds For Simulating Long-Time In Vitro Degradation Using A Continuum Damage Model, Dam Kim
Theses and Dissertations
While magnesium and its alloys are viable biodegradable implant candidates for its similarity of Young’s modulus with human bone and its strong biocompatibility, a pure magnesium scaffold degrades too rapidly to be used in many orthopedic implications. Overcoming this high degradation rate has been one of the biggest technical challenges for Mg-based biomedical applications. This research focuses on validating a finite element analysis framework using a continuum damage model and its application to simulate the degradation process of non-coated additively manufactured WE43 and HA-coated WE43 magnesium scaffolds. This work includes determining model input parameters by matching in vitro experiment results …
Cyber Security Threat Recognition And Preparedness Of Undergraduate Students, Litany Hope Lineberry
Cyber Security Threat Recognition And Preparedness Of Undergraduate Students, Litany Hope Lineberry
Theses and Dissertations
Cybersecurity awareness and preparedness are critical competencies for individuals across academic disciplines and professional sectors. However, undergraduate students often lack sufficient knowledge and skills to recognize and mitigate cybersecurity threats. This dissertation examines cybersecurity threat recognition and preparedness among undergraduate students through a three-phase research approach. Study 1 explores faculty perspectives on students' cybersecurity awareness, identifying gaps in knowledge and preparedness across various fields of study. Study 2 investigates industry professionals' perceptions of new hires’ cybersecurity readiness, assessing the alignment between academic training and industry expectations. Study 3 evaluates the effectiveness of an online intervention designed to enhance students' cybersecurity …
Asphalt Durability Improvements By Way Of Specification Advancements, Jessica V. Lewis
Asphalt Durability Improvements By Way Of Specification Advancements, Jessica V. Lewis
Theses and Dissertations
The objective of this dissertation is to provide content through which industry and agencies can adjust and/or update standards and specifications, as appropriate, to accommodate the present-day needs of the asphalt industry towards producing more durable asphalt. A total of 78 asphalt mixtures and 9 asphalt binders were evaluated for up to 10 years of field aging to provide content that was analyzed to meet this objective. A full-scale aging site in Columbus, Mississippi was the focal point of the aging experiments. A major conclusion from this work was that Cantabro Mass Loss (CML) testing of cores was able to …
The Effect Of X-Ray Irradiation Technology On Salmonella Spp. And Quality Parameters Of Ready-To-Bake Chocolate Chip Cookie Dough, Kala Grace Morris
The Effect Of X-Ray Irradiation Technology On Salmonella Spp. And Quality Parameters Of Ready-To-Bake Chocolate Chip Cookie Dough, Kala Grace Morris
Theses and Dissertations
Salmonella contamination in cookie dough poses a threat to consumers. This study investigated the effect of X-ray irradiation on Salmonella-inoculated ready-to-bake chocolate chip cookie dough and its impact on dough quality. A Salmonella cocktail (~10 log CFU/g) was prepared and inoculated into cookie dough samples (~6.5 log CFU/g) and then treated with X?ray irradiation (0.25, 0.5, and 1 kGy). Salmonella decreased by 1.15, 1.79, and 2.49 log CFU/g, at an exposure of 0.25, 0.5, and 1 kGy, respectively. Quality parameters (pH, aw, and colorimetry) were evaluated for two brands. No statistical difference (P>0.05) in pH was observed for Brand …
Evaluation Of Soybean (Glycine Max (L.) Merr.) Yield Potential Following Simulated Population Loss And Replant Strategies, William Paul O'Neal
Evaluation Of Soybean (Glycine Max (L.) Merr.) Yield Potential Following Simulated Population Loss And Replant Strategies, William Paul O'Neal
Theses and Dissertations
Soybean producers are often faced with challenges regarding stand loss situations that can be caused by many different things. Often, in a replant situation, producers must decide if it is best to keep the failed stand without replanting, keep the failed stand and replant at a lower rate, or terminate the failed stand and replant at a full rate. Therefore, the objectives of this research were to evaluate soybean yield potential following differing levels of simulated stand loss as well as to evaluate soybean yield potential following simulated stand loss with different levels of replant. Experiments were conducted in 2023 …
Large-Scale Reserve Constrained Alternating Current Optimal Power Flow Methods, Yehong Peng
Large-Scale Reserve Constrained Alternating Current Optimal Power Flow Methods, Yehong Peng
Theses and Dissertations
The Alternating Current Optimal Power Flow (ACOPF) problem seeks optimal operational planning for power systems with the lowest cost within the operational and physical constraints, ensuring higher efficiency and reliability for the power system. Meanwhile, the power reserve scheduling, which ensures an adequate backup capacity to compensate for demand and supply fluctuations, contingencies, and various unforeseen disruptions, plays a crucial role in power system reliability. As power systems become more stochastic and dynamic, the co optimization of energy and reserve becomes a significant trend among independent system operators (ISOs) and regional transmission organizations (RTOs), as it yields substantial benefit improvement …
Evaluation Of Broiler Performance And Processing Metrics Through Sodium Bisulfate Application To Litter And Varying Inclusions In Feed, Samantha Suzanne Plocher
Evaluation Of Broiler Performance And Processing Metrics Through Sodium Bisulfate Application To Litter And Varying Inclusions In Feed, Samantha Suzanne Plocher
Theses and Dissertations
Poultry producers must continuously evaluate current practices and determine new ones to further optimize broiler production. Sodium bisulfate (SB) is used as a poultry litter amendment (SBL), but also in human food to control pH; thus, initiating interest for SB in feed (SBF) for performance and gut health benefits. This thesis utilized common diets varying in SBF (Chapters II and III) and SBL (Chapter II; SBL1- d 0 and SBL2 – d 0 and 18) to optimize 40 d broiler performance, litter quality, and d 41 processing metrics. For Chapter II, d 0 SBL1 dramatically lowered litter pH, while minimally …
Cotton Development, Yield, And Boll Distribution Response To Row Pattern And Plant Density, William Joseph Rutland
Cotton Development, Yield, And Boll Distribution Response To Row Pattern And Plant Density, William Joseph Rutland
Theses and Dissertations
The effects of row pattern and plant density on the ability of cotton (Gossypium hirsutum L.) to compensate and sustain profitable yields has been evaluated by many studies. However, new varieties exhibiting more vigorous growth and more exaggerated row patterns have yet to be evaluated. Therefore, experiments were conducted in Starkville, MS and Stoneville, MS in 2021 and 2022 to evaluate the influence of 1x1 skip row patterns and plant density on cotton growth, development, yield, boll distribution, and profitability. In 2021 there was no yield response due to plant population. However, in 2022, yields increased as plant density increased. …
Evaluating The Efficiency And Effectiveness Of Drones For Monitoring Animals, Emma Ann Schultz
Evaluating The Efficiency And Effectiveness Of Drones For Monitoring Animals, Emma Ann Schultz
Theses and Dissertations
Accurate animal population estimates inform effective conservation and management strategies. Drones have become a common tool for animal monitoring. Typical drone flight planning involves image overlap to create an orthomosaic; however, this may lead to animal population estimate errors. To quantify this sampling error, I simulated a range of real-world monitoring scenarios for robust application in assessment of animal counts from drones using agent-based modeling. Scenarios investigated effects of 1) animal densities, 2) animal distributions, 3) animal movements, and 4) drone flight patterns. First, I investigated five animal densities (n = 4, 9, 25, 49, 100 animals/survey area) and three …
Costs And Challenges In The Mississippi Log Trucking Industry, James Tucker Shannon
Costs And Challenges In The Mississippi Log Trucking Industry, James Tucker Shannon
Theses and Dissertations
Challenges impacting Mississippi log trucking businesses include escalating production costs, labor shortages, aging ownership, and rising liability insurance premiums. These concerns are transmitted back to loggers, landowners, and the entire forest products industry, reducing their contributions to the state’s economy. Lack of current knowledge concerning the adaptation of Mississippi log trucking companies under adverse business conditions necessitated a statewide mixed-mode survey to determine the industry’s structure, the nature of liability insurance premiums, and business owner perceptions about driver hiring and profitability. Mississippi log trucking business owners and drivers were predominantly middle-aged, with fewer individuals under the age of 40. Log …
Design And Evaluation Of A 5g Testbed: Analyzing Security Solutions, Iq Sample Management, And Performance Visualization, Mohammed Saleh Shaik
Design And Evaluation Of A 5g Testbed: Analyzing Security Solutions, Iq Sample Management, And Performance Visualization, Mohammed Saleh Shaik
Theses and Dissertations
The evolution of 5G networks has introduced new opportunities for high-speed, low-latency wireless communication, supporting a wide range of applications from industrial automation to secure data transmission. However, as 5G networks become more complex, ensuring security and maintaining optimal performance present significant challenges. This thesis explores the development of a 5G testbed using Software-Defined Radios (SDRs) and open-source platforms to analyze signal behavior, security implementations, and performance. The testbed, built with the open source srsRAN software library and widely available SDR hardware, serves as a controlled environment for studying 5G communications security features and innovations. To evaluate transmission characteristics, in-phase/quadrature …
A Fine-Tined Bert Model For Improved Querying Of The Unmanned Aerial System Integration Safety And Security Technology Ontology, Minh Hong To
Theses and Dissertations
The use of unmanned aerial vehicles (UAS) in all industries is steadily increasing every year. To govern the use of UAS, the Federal Aviation Administration (FAA) seeks to provide a foundation of rules and regulations for UAS operation in the National Airspace System (NAS). The UAS Integration Safety and Security Technology Ontology (ISSTO) was developed using the Web Ontology Language (OWL) in 2023. In 2024, a query application was developed to search ISSTO for information about the safety and security of UAS operations. While the application is functional, the search results can be further fine-tuned to match what the user …
Combined Effect Of Chitosan And Lemon Essential Oil-Infused Slush Ice On The Shelf Life Of Channel Catfish, Dianna Wilson
Combined Effect Of Chitosan And Lemon Essential Oil-Infused Slush Ice On The Shelf Life Of Channel Catfish, Dianna Wilson
Theses and Dissertations
The objective of this research was to investigate the biopreservative effects of chitosan and lemon essential oil in slush ice treatments on the microbial shelf life of refrigerated catfish fillets. Catfish fillets were stored in slush ice treatments containing chitosan (CH), lemon essential oil (LO), a combination (CH+LO), water (CTRL), and no slush (NS) for three d at 4 C, then stored at 4C for twelve d post-slush. The growth of background microflora in catfish fillets treated with CH and CH+LO was reduced (P<0.05), maintaining total aerobic counts below 4.5 log CFU/g, while the control reached spoilage levels (>7 log CFU/g) by Day 6. Chitosan effectively extended the microbial shelf life but lowered pH, …
Effects Of Different Forms Of Dietary Zinc On Weaned Steers When Fed Prior To Weaning, Christopher Lane Addison
Effects Of Different Forms Of Dietary Zinc On Weaned Steers When Fed Prior To Weaning, Christopher Lane Addison
Theses and Dissertations
Zinc (Zn) is crucial for many life sustaining processes within the body. Additional Zn is known to be beneficial during certain periods of increased stress. Weaning is one of the most stressful periods of beef calves’ lives. Due to this it was hypothesized that additional zinc in an organic form would increase weight gain and immune response compared to additional zinc in an inorganic form or no added zinc. No differences were found for ADG, Th score, IgG concentration, or mineral concentration among treatments. However, there was a novel and unexpected finding when there was no difference found in preweaning …
Empowering Patients With Health Insights: Development And Utilization Of Knowledge Graphs For Comprehensive Patient Medical Journey Mapping And Analytics, Hassan Saadeddine Al Khatib
Empowering Patients With Health Insights: Development And Utilization Of Knowledge Graphs For Comprehensive Patient Medical Journey Mapping And Analytics, Hassan Saadeddine Al Khatib
Theses and Dissertations
Healthcare advancements require advanced solutions to process and understand complex patient data. This dissertation outlines a detailed framework for mapping patient journeys with knowledge graphs (KGs), which begins by analyzing existing Patient-Centric Knowledge Graphs (PCKGs) literature to identify current research gaps in the representation and analysis of patient journeys. Our research proposes solutions to these gaps through three main contributions. First, we introduce the Patient Journey Ontology (PJO), which enables systematic encoding of patient encounters, diagnoses, treatments, and outcomes into a semantic knowledge structure designed for interoperability. The construction of patient journey knowledge graphs (PJKGs) is based on this foundational …
Global Attractivity Of Positive Solutions Of Higher Order Nonlinear Difference Equations And Its Applications, Abdulaziz Almaslokh
Global Attractivity Of Positive Solutions Of Higher Order Nonlinear Difference Equations And Its Applications, Abdulaziz Almaslokh
Theses and Dissertations
Difference equations play an effective role in many mathematical models that represent some phenomena in different fields such as physics, economics, engineering and biology. From this perspective, studying and analyzing such equations are interesting issues for the advancement of scientific research. In particular, studying the asymptotic behavior of positive solutions of some population models that are a system of difference equations has become a necessity. In this dissertation, we examine the global attractivity of positive solutions of certain higher order nonlinear difference equations and apply these results to some population models.
Promoting Collaboration And Multi-Directional Reliance By Sharing Mental Model Information For Effective Multi-Agent Teaming, Audrey L. Aldridge
Promoting Collaboration And Multi-Directional Reliance By Sharing Mental Model Information For Effective Multi-Agent Teaming, Audrey L. Aldridge
Theses and Dissertations
Successful human-agent teaming requires teammates to form and maintain a shared or common understanding of several attributes regarding taskwork and teamwork. With enhanced information sharing, mental model development, and team functionality, teammates (human, autonomous) can learn to anticipate each others' behaviors, preferences, and needs as well as understand their capabilities and limitations. In designing a framework to support this type of cooperative teaming, there is a need to determine how sharing knowledge, mental models, and common understandings impacts teaming dynamics and performance. By incorporating each individual's understanding into a human-agent interface, this research enables better team coordination and performance through …
The Teaching Experiences Of Black Women Faculty In Educator Preparation Providers Licensure Programs At Predominantly White Institutions, Tiffiney M. Atterberry
The Teaching Experiences Of Black Women Faculty In Educator Preparation Providers Licensure Programs At Predominantly White Institutions, Tiffiney M. Atterberry
Theses and Dissertations
Understanding the experiences that Black women faculty encounter in instructional spaces of Educator Preparation Providers licensure programs (hereafter referred to as EPPs) at predominantly White institutions are important for institutional change and reform to occur. In spaces of EPPs, Black women faculty are forced to cope and deal with racialized issues such as feelings of social isolation, a lack of inclusion, acts of microaggression from students, disrespectful acts, and students challenging their knowledge and credentials. The purpose of this qualitative study was to explore how Black women faculty narrate their teaching experiences in EPPs at PWIs. The use of Collins’ …
Adjuvants To Improve Pre- And Postemergence Weed Control In Soybean, Sydney Baker
Adjuvants To Improve Pre- And Postemergence Weed Control In Soybean, Sydney Baker
Theses and Dissertations
Cover crops provide soybean producers with multiple benefits; however, cover crop residue can impose a physical barrier for herbicide spray droplets and hinder the deposition and performance of soil-applied residual herbicides. Adjuvants are routinely mixed with herbicides to improve weed control performance and may provide a way to help the spray droplets overcome the barrier that the cover crops impose. This research evaluated the effectiveness of several soil applied herbicide-adjuvant combinations to control Amaranthus spp. L., Sida spinosa L., and [Echinochloa crus-galli (L.) P. Beauv.] in soybean and the effectiveness of two surfactants for improving preemergence herbicide efficacy in a …
An Investigation Of Non-Persistence Of Second And Third Year Engineering Students At A Midsize Research University In The South, Kimberly Elizabeth Ball
An Investigation Of Non-Persistence Of Second And Third Year Engineering Students At A Midsize Research University In The South, Kimberly Elizabeth Ball
Theses and Dissertations
Approximately 25% of engineering students drop out during their 1st year of school, with nearly that many leaving during their second or third years. A meta-analysis of engineering non-persistence literature led to the development of an Engineering Non-persistence Model, which incorporates both quantitative and qualitative factors. While previous research primarily focused on factors of non-persistence of engineering students as a whole, this study aims to fill the gap in existing literature by examining factors within the model that contribute to non-persistence among 2nd- and 3rd-year engineering students. The goal is to provide tailored support to second and third year students …
The Influence Of Nature On Design: A Focus On The Flora And Fauna Influence On 18th And 19th Century Decorative Arts, Rachel Ann Bozeman
The Influence Of Nature On Design: A Focus On The Flora And Fauna Influence On 18th And 19th Century Decorative Arts, Rachel Ann Bozeman
Theses and Dissertations
This study aims to assist interior designers and preservationists in enhancing interior decoration by appreciating decorative arts in a historically accurate and visually appealing manner. It places a strong emphasis on the profound influence of nature on design. For centuries, creatives have drawn inspiration from nature, leading to the creation of unique design elements and decorative objects. In the eighteenth and nineteenth centuries, naturalists produced floral and faunal prints that reflected this inspiration. Nature's impact on design extends beyond aesthetics; it also affects how individuals feel within a space. The environment one person inhabits influences his or her state of …
An Approach To Expanding The Industrial Training And Assessment Center To The Residential Sector, Cailee Addison Bush
An Approach To Expanding The Industrial Training And Assessment Center To The Residential Sector, Cailee Addison Bush
Theses and Dissertations
The Industrial Training and Assessment Center (ITAC) conducts no-cost energy audits for small and medium sized industrial and commercial buildings across the United States, with a goal to train students in energy optimization and cost reduction, while helping companies to reduce inefficiencies and waste. Expanding this program to the residential sector can reduce energy usage across the United States, largely due to this sector contributing to 15% of America’s energy usage. This research examines the development of a procedure to transition the ITAC into including the residential sector. To ensure a seamless introduction of this sector, the procedure must contain …
Evaluating Simulated Threecornered Alfalfa Hopper (Hemiptera: Membracidae) Damage In Cotton (Malvales: Malvaceae) And Identifying Conducive Environments, Reece Starnes Butler
Evaluating Simulated Threecornered Alfalfa Hopper (Hemiptera: Membracidae) Damage In Cotton (Malvales: Malvaceae) And Identifying Conducive Environments, Reece Starnes Butler
Theses and Dissertations
This research evaluated the effects of simulated threecornered alfalfa hopper (TCAH), Spissistilus festinus (Say), damage in cotton and aimed to identify environments that may contribute to an increase in TCAH injury. During the 2023 and 2024 growing season, simulated TCAH damage was imposed at 0%, 10%, 20%, 30%, 40%, and 50% at the three and six leaf growth stage. Agronomic data included plant heights, node counts, and plant mapping, which was collected throughout the growing season, while lint yield was recorded at harvest. Damaged plants exhibited reduced plant heights and node counts, with an increase in nodes above cracked boll …
The Role Of Institutional Image In First-Generation Student Choice To Attend A Rural Southern Community College, Megan Caves Clark
The Role Of Institutional Image In First-Generation Student Choice To Attend A Rural Southern Community College, Megan Caves Clark
Theses and Dissertations
As higher education continues to become more competitive with each passing year, research indicates that a favorable image perception of an institution can be achieved through strategic social media presence. With previous literature primarily discussing the impacts of institutional image at a university level, this dissertation explores the role of institutional image in first-generation student choice to attend a rural Southern community college. Using photo elicitation, this qualitative study sought to understand how a rural community college’s social media influences rural, first-generation student’s perception of the college. Results indicated that institutional image perception through social media may play a role …