VTechWorks Repository :: Browsing by Author "Iorio, Josh"

Browsing by Author "Iorio, Josh"

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Characterizing Building Digital Twins for Facilities Management
Kinani, Toufa (Virginia Tech, 2023-01-30)
Digital twins (DT) describe the integration of the physical and digital worlds with the aim of optimizing real world operations and functions. The digital twin concept has gained increasing attention across industries in the past decade including the building sector. However digital twins remain ambiguous with various existing definitions and characteristics. While DTs include all life cycle phases, ultimately their goal is optimization of operations during the use phase. Of the building life cycle phases, building facilities management (FM) is responsible for considerable costs and energy consumption and has potential for improvement through DT implementation. Along with increased building information modeling (BIM) implementation, recent advances in data driven technologies have encouraged the exploration of DT in the building sector. BIM has been coupled with technologies such as internet of things (IoT), data analytics, and cloud computing to optimize various FM functions often resembling DT. This study has reviewed existing literature on digital twins in facilities management using a structured literature review and characterized similar characteristics and definitions by different authors. Additionally, DT implementation in different FM application areas was quantified and analyzed. Results show that DT implementation in FM is still at nascent stages with major challenges surrounding standardization and data integration.
Embodied Virtual Reality: The Impacts of Human-Nature Connection During Engineering Design
Trump, Joshua Jordan (Virginia Tech, 2024-03-19)
The engineering design process can underutilize nature-based solutions during infrastructure development. Instances of nature within the built environment are reflections of the human-nature connection, which may alter how designers ideate solutions to a given design task, especially through virtual reality (VR) as an embodied perspective taking platform. Embodied VR helps designers "see" as an end-user sees, inclusive of the natural environment through the uptake of an avatar, such as a bird or fish. Embodied VR emits empathy toward the avatar, e.g., to see as a bird in VR, one tends to feel and think as a bird. Furthermore, embodied VR also impacts altruistic behavior toward the environment, specifically through proenvironmental behaviors. However, limited research discovers the impact of embodied VR on the human-nature connection and if embodied VR has any impact on how designers ideate, specifically surrounding nature-based solutions as a form of a proenvironmental behavior during the design process. This research first presents a formal measurement of embodied VR's impact on the human-nature connection and maps this impact toward design-related proenvironmental behaviors through design ideas, i. e., tracking changes in nature-based design choices. The design study consisted of three groups of engineering undergraduate students which were given a case study and plan review: a VR group embodying a bird (n=35), a self-lens VR group (n=34), and a control group (n=33). The case study was about a federal mandate to minimize combined sewer overflow in a neighborhood within Cincinnati, OH. Following the plan review, VR groups were given a VR walkthrough or flythrough of the case study area of interest as a selected avatar (embodied:bird, self-lens:oneself). Participants were tested for their connectedness to nature and a mock-design charrette was held to measure engineering design ideas. Verbal protocol analysis was followed, instructing participants to think aloud. Design ideation sessions were recorded and manually transcribed. The results of the study indicated that embodiment impacts the human-nature connection based on participants' perceived connection to nature. Only the bird group witnessed an increase in connectedness to nature, whereas the self-lens and control groups did not report any change. This change in connectedness to nature was also confirmed by engineering design ideas. The bird group was more likely to ideate green-thinking designs to solve the stormwater issue and benefit both nature and socioeconomic conditions, whereas the control group mostly discussed gray designs as the catalyst for minimizing combined sewer overflows. The self-lens group also mentioned green design ideas as well as socioeconomic change, but mostly placed the beneficiary of the design toward people rather than nature in the bird group. The mode of analysis for these findings was driven by thematic content analysis, an exploration of design space as a function of semantic distance, and large language models (LLMs) to synthesize design ideas and themes. An LLM's performance lent accuracy to the design ideas in comparison to thematic content analysis, but struggled to cross-compare groups to provide generalizable findings. This research is intended to benefit the engineering design process with a) the benefit of perspective-taking on design ideas based on lenses of embodied VR and b) various methods to supplement thematic content analysis for coding design ideas.
Exploring the Role of Cultural Boundary Spanners at Complex Boundaries in Global Virtual AEC Networks
Zelkowicz, Andres; Iorio, Josh; Taylor, John E. (2015)
As the architecture, engineering and construction industry continues to globalize, project work is more often executed by geographically distributed, technologically mediated teams of knowledge specialists organized into global virtual project networks. These networks are characterized by a number of boundaries that must be spanned in order to develop effective project outcomes. Prior research has examined the efficacy of cultural boundary spanners and technical boundary spanners in these types of networks, but we lack an understanding of how spanners perform in complex boundary environments where boundaries co-occur. Our research aims to explore the efficacy of cultural boundary spanners who are positioned at technical and knowledge domain boundaries. The results of our preliminary research suggest that cultural boundary spanners may only be effective at facilitating efficient information transfer when they are positioned at a knowledge domain boundary in which they have specialization. We found that the interactional norms that develop within the network based on the efficacy of boundary spanners can also position them at inappropriate knowledge domain boundaries, which can lead to decreased efficiency of information transfer. Our research provides an initial contribution to our understanding of boundary complexity in global virtual projects networks with implications for improving network performance.
Heuristics in Construction Project Management
Sprinkle, Zachary Joseph (Virginia Tech, 2019-01-30)
Modern construction projects are delivered in complex, fast pace environments. Stakeholders are required to participate in dynamic project settings with resource constraints, information constraints, and time constraints. To overcome gaps in knowledge, to deliver decisions quickly, and to overcome human limits in cognitive ability, decision makers typically employ heuristics, or rules of thumb to arrive at relatively quick answers. Heuristics are cognitive shortcuts that an individual employs to arrive at quick decisions (Goodwin et al., 2004). These heuristics are used in a variety of ways, ranging from using the process of elimination (elimination heuristic) to applying different cognitive weights to options based on recent experience, reputation, or familiarity (Shah and Oppenheimer, 2008). This research aims to identify heuristics present in the implementation phase of construction. By summarizing the results of two studies conducted with a Mid-Atlantic Contractor, this thesis prescribes seven heuristics commonly used by construction stakeholders.
The Impact of Avatars, Social Norms and Copresence on the Collaboration Effectiveness of AEC Virtual Teams
Anderson, Anne; Dossick, Carrie Sturts; Iorio, Josh; Taylor, John E. (2017)
A growing number of architecture, engineering, and construction (AEC) firms are outsourcing complex design and construction work to international vendors. Due to the significant geographic distances that can separate project team members in global design networks, much of this work is executed in virtual teams, defined as teams composed of geographically separated members who collaborate to accomplish organizational tasks mediated by technology. The challenges of working in geographically distributed networks have prompted the development of alternative, virtual workspaces. Questions remain on how these virtual workspaces support or hinder collaborative work. People are social beings that rely on body language and other non-verbal cues to communicate. What happens to team formation and collaborative effectiveness when non-verbal cues are mediated through avatar actions? In this paper, qualitative ethnographic data collected over four years from studies conducted in a 3D virtual world are used to examine collaboration effectiveness of global virtual engineering project teams. We found that avatar movement and position was effective at communicating nonverbal information, even when done so unintentionally. Avatar actions that map to established social norms in the physical world results in more efficient communication. Collaboration was also enhanced when gesture bubbles were used for backchannel communication and when text chat was used to avoid interrupting voice communication. We found collaboration was hindered when the learning curve was too steep for participants to adapt to tool use or avatar actions in the environment. These findings have important implications for the future of collaboration in virtual environments, particularly in the AEC industry where 3D models can be imported into the virtual environment and explored synchronously by a project team.
Improving the Design of Civil Infrastructure Messages for the Public
Grinton Jr, Charlie Wendell (Virginia Tech, 2024-09-18)
Civil infrastructure serves as the driving force behind the evolution of a safe, sustainable, and efficient environment. However, the way information about civil infrastructure has been communicated to the public has been insufficient. Since every human is intrinsically different, designing, and dispersing information about civil infrastructure that accommodates everyone, while also being direct and concise has been a challenge for policymakers and other federal, state, local, and tribal civil engineering stakeholders. Though there has been a plethora of research conducted on message design and communication in other disciplines, little research has been done in the US that focuses on designing more accessible, actionable civil infrastructure messages. The objective of this research was to investigate how to improve the accessibility of civil infrastructure messages and communication infrastructure to enhance the public's ability to make daily infrastructure decisions. This research study utilized quantitative and qualitative methods to analyze and discuss various ways that civil infrastructure messages can be improved. Results from this study are based on the exploration of three different ways in which civil infrastructure messaging can be improved: policy, transportation/roadway safety, and emergency response. Data sources include eight publicly accessible energy policies from 1978-2022, a publicly available dataset of more than 75 thousand WEAs, and a dataset retrieved from Shealy et al. (2020), which collected data on 300 Virginia drivers in both rural and urban areas. A descriptive policy analysis and Flesch-Kincaid readability test were conducted to historically analyze energy policies and understand their accessibility impacts for research question 1; a brain activation network analysis was conducted and nodal network measures (i.e., network density, degree centrality) were used to investigate the cognitive response Virginia drivers had for various types of non-traditional traffic safety messages for research question 2; and sentiment analysis, emotion detection analysis, as well as a two-phased qualitative coding analysis (i.e., in-vivo coding, focused coding) were conducted to investigate how WEAs can be better designed to increase public attention and engagement for research question 3. The findings from this study demonstrate how emotional content that is present in tweets authored by community members affected by the natural disaster event can be incorporated into the WEA template. The findings from research question 1 identified potential issues with accessibility and energy policy. Also, the findings from this study describe the content included in the parallel documents that federal agencies use to communicate the most important information of a policy. The findings from research question 2 demonstrate that while the various types of non-traditional traffic safety messages produced variances in cognitive response, messages that included negative emotional content or statistics should be further explored on their impact on evoking safer driving behaviors. The findings from research question 3 reported on how emotional content could be incorporated into the template design of WEAs. The implications from this dissertation provide valuable insights for policymakers, civil engineers, transportation engineers, and emergency response stakeholders and the conclusions set the stage for future research to improve the design of more accessible civil infrastructure messages.
Instructional Video Object-Based Learning in a Flipped Construction Management Classroom
Barnes, Andrew Floyd (Virginia Tech, 2021-04-19)
Traditional methods of teaching (i.e., didactic reading and lecture) remain the primary way instruction is delivered in construction management (CM) classrooms. This is true despite a growing body of literature promoting more contemporary, student-centered pedagogies that offer improvements over traditional teaching models. One of these is object-based learning (OBL), a student-centered approach that uses digital learning objects (LOs), such as videos, images, animations, mobile apps, and educational games, to facilitate deep and engaging learning experiences. One of the most common types of LO is instructional videos. Over the past quarter century, abundant research has been conducted in the field of computer science to advance the quality and reach of instructional video LOs. In contrast, a relatively small amount of research has been dedicated to understanding them in terms of their pedagogical efficacy. This is especially true for the field of CM. Very little empirical research currently exists at the intersection of CM and OBL. This dissertation examines the ability of supplemental instructional videos (SIVs) — a specific type of instructional video that complements other forms of instruction, including in-person teaching, readings, and group work, to deliver a full learning experience — to improve both the performance and the quality of the learning experience for undergraduate CM students. The first chapter of the dissertation is introductory, providing information about the major themes of the dissertation including construction management education, OBL, SIVs, and flipped classrooms. The second chapter explores the foundational learning theories that support OBL in a flipped CM classroom. A theoretical framework is proposed that can be used by teachers to guide them as they tailor their own approach for using instructional videos. The third chapter presents an interdisciplinary synthesis of best practices for the design and development of SIVs. Using these best practices, I document the production process of SIVs for an undergraduate CM course called Residential Construction Technologies. The fourth and fifth chapters cover a study in which the SIVs I developed were used as teaching aids for pre-class readings in Residential Construction Technologies. Chapter Four centers on a repeated measures experiment that was designed to evaluate the effectiveness of the SIVs at improving student performance. Chapter Five uses surveys and interviews to understand student perceptions of the SIVs. Overall, I found that the SIVs had little measurable effect on improving the student's grades. However, overwhelmingly, the students reported that they valued having the videos, and felt that they helped with their understanding of unfamiliar or complicated course topics. Chapter Six concludes the dissertation with a short synthesis of all chapters and summary of their major themes and findings.
Intersections: Privilege
Iorio, Josh; Faulkner, Brandy S.; Paige, Frederick; Copper, Cathryn (Virginia Tech. University Libraries, 2018-10-10)
How does gender, race, and class privilege inform the design and construction of the built environment? Panelists will discuss how gender-related language norms, race-related structures of power in the workplace, and occupancy of sustainable infrastructures in the housing industry impact the built environment. Should we as a society demand more equity from the individuals that create the built world?
Interstitial Building Space and its Relationship to Evidence Based Design
DiMaio, Christopher Michael (Virginia Tech, 2019-06-07)
Healthcare facilities are dynamic, long-term investments that must be able to respond to change in order to avoid obsolescence. Flexibility is a response used in healthcare facility design and construction to counter uncertainties, such as changing medical technologies, medical science and regulations. Flexible infrastructure design offers healthcare facilities the opportunity to combat obsolescence stemming from uncertainties. Interstitial Building Space (IBS) is one of many flexible infrastructure design options that assists with both mid-range and long-term flexibility. IBS is an unfinished and unoccupied horizontal space between a building's floors, fully accessible to people for the purpose of service and maintenance. The advent of Evidence Based Design (EBD) introduced a new dimension to the already dynamic healthcare facility. "EBD represents a body of science that links elements of the built environment with patient, staff and resource outcomes" (Malone et al. 2007 p.5). The incorporation of EBD increases the complexity for the design and construction of healthcare facilities. A framework was developed that articulates the dependent relationships between flexibility, IBS and EBD. The framework is comprised of three key elements: 1) a comprehensive "IBS Spectrum of Benefits" matrix resulting from a systematic literature review 2) a "Flexibility-EBD Conceptual Model" illustrating the relationship between flexibility and EBD, while identifying a continuum of flexibility enabled by this relationship; and 3) a "IBS-EBD Component Mapping Framework" articulating direct matches between the "IBS Spectrum of Benefits" and EBD components. The framework and the key elements within provide a foundational resource for stakeholders and researchers alike, navigating the interrelated intricacies associated with flexibility, EBD and IBS.
Investigating Radical High-Involvement Eco-Innovations: The Case of Household Biogas in the U.S.
Dowell, Zachary David (Virginia Tech, 2024-06-07)
There is an emerging market of radical eco-innovations that require high involvement from the U.S. consumer for successful routinization. Yet, there exists a gap in knowledge that guides the dissemination of such innovations for related stakeholders. Among these innovations is the household digester (HD), which is marketed as an innovation capable of generating biogas and fertilizer through processing organic waste at its point-of-source (POS). The HD may surpass other high-involvement eco-innovations in respect to levels of involvement necessary for consumer routinization and sustained operation. However, previously unexplored factors within the contemporary U.S. landscape have spurred recent growth in HD adoption. This dissertation took a three-manuscript approach in the investigation of factors that influence the adoption and diffusion of HD in the U.S. The first of three studies tested a literature-based conceptual model framed within the multi-level perspective (MLP) to identify barriers and drivers of HD adoption. Qualitative data from expert interviews and social media posts inform the production of a taxonomy of complexities that depict the current state of HD in the U.S. Findings indicate that HD marketing during the Covid pandemic brought forth new adopter populations seeking resilience due to infrastructure distrust. The second study investigated motivations for HD adoption through operationalizing constructs from psychology literature and diffusion of innovation theory (DOI). Through in-depth interviews with adopters, the factors of relative advantage, compatibility, and cost were found to outweigh pro-environmental behavior (PEB) in adoption decisions. Furthermore, high-involvement was not found to influence adoption decisions. The final study employed a collective case study approach that explored paths to HD routinization among ten adopters. Results highlight the ability of adopters to overcome technical challenges through reinventions necessary for contextual adaptations. This dissertation contributes insights into the adoption and diffusion of radical high-involvement eco-innovations, offering implications for policy, practice, and future research in emerging innovations interacting within socio-technical transitions.
Investigation of Contractual Specification and Implementation of Relational Approaches in Public Private Partnership (PPP) Projects
Khurana, Mayank (Virginia Tech, 2021-08-30)
Public-Private Partnerships (PPPs) have unique characteristics such as a long time horizon and multiple stakeholders involved. This can lead to common transaction hazards – uncertainty, asset specificity, imperfect information and incomplete contracts, which can further promote opportunistic behavior between parties. Although contracts are designed to govern projects and curb opportunism, their efficacy is limited by these transaction hazards. Therefore, the development of strong relationships and cooperative behavior among stakeholders are often emphasized to complement contractual provisions, which can mitigate transaction hazard impacts. Relational contracting includes a set of principles such as flexibility and effective communication, which promote cooperative behavior and advance mutually beneficial outcomes for stakeholders. A relational contract can include different relational approaches such as informal resolution procedures, partnering practices and incentives to promote relational exchanges in a project. The level of presence of these relational approaches in PPP contracts is an indication of their ability to further inter-organizational relationships. Although previous studies have summarized and further investigated relational approaches in construction projects using conventional delivery methods, similar investigations for PPP projects are limited. Furthermore, relational contracting theory suggests that the contractual inclusion of approaches does not assure their implementation in the field. Stakeholders tend to form working relationships different than what is intended in the contract. Therefore, examining the implementation of these approaches is an important precursor to exploring their effectiveness and capacity to promote stronger relationships between parties. Accordingly, this research presents three complementary studies to enhance understanding of relational approaches employed in PPP projects. The first study focused on the identification of relational approaches described in the literature for specification in PPP contracts to enhance cooperative behavior. A comprehensive literature review process identified relational approaches that were grouped into six categories – communication/nature of negotiations, partnering, conflict resolution methods, monitoring, changes process and risk allocation. The second study examined the extent that the relational approaches identified in the first study were specified in 22 PPP transportation project contracts in the United States. This investigation characterized how relational these contracts are, which is indicative of the capacity of these contracts to promote relational exchanges in a project. For instance, different partnering practices were either included in contracts or not, while the inclusion of conflict resolution methods in contracts was selective. The third study investigated the implementation of relational approaches in practice. Semi-structured interviews of 13 subject matter experts were conducted to obtain perspectives regarding the implementation of different relational approaches. For example, all the interviewees emphasized handling conflicts through informal resolution methods to save the time and effort required in third party methods such as mediation, arbitration and dispute review boards. A framework intended to promote proactive management of stakeholder relationships is proposed based on the findings. Collectively, these three complementary studies shed light on the current state of contractual inclusion and implementation of relational approaches in PPP projects in the United States. Overall, this research contributes towards the growing literature concerning the complementarity between contractual and relational governance, which is needed for improved project performance. These studies have advanced understanding of relational approaches in PPPs by establishing a baseline for their current contractual specification in PPP projects and identifying factors influencing their implementation in the field. Future research can explore their impact on project performance and counterparty relations.
Investigation of International Service Learning in Engineering Education
Baugher, Brooke Erin (Virginia Tech, 2019-01-25)
International service learning (ISL) has been integrated into engineering education and has become increasingly more popular in co-curricular experiences. While prior research investigates each of these avenues of ISL, we have not investigated how these experiences compare to one another in terms of student learning outcomes or understood these experiences from a national perspective. The purpose of this thesis is to address these gaps in existing literature and to provide a comprehensive, holistic perspective of ISL experiences ability to impact student learning on a national scale. To better understand student learning outcomes in engineering ethics, agency and identity and draw comparisons in student career choices, several survey instruments were used within a nationally-representative survey distributed to engineering seniors (n=1911) at four-year universities within the United States. Descriptive statistics were used to categorize he responses by type of ISL experience: capstone, work, or co-curricular. The survey instruments were used to measure the individual learning outcomes: engineering ethics contained 5 items, engineering identity contained 14 items, and engineering agency contained 12 original items. Each survey instrument was validated using an exploratory factor analysis (EFA) to determine the relevant factor groups for each construct. An ANOVA test or Kruskal Wallis, the non-parametric equivalent test, was used for each dataset depending on normal distribution of the data. Responses in engineering ethics showed a significantly higher score in students’ ethics understanding with ISL capstone (p< 0.001) and work experience (p<0.0001) and a medium effect size for both (Cohen’s d=0.3). Responses in engineering agency scores showed a significant difference with ISL capstone (p<0.05) and co-curricular experience (p<0.05) with a medium effect size (Cohen’s d=0.3). Additionally, responses to predicted career choice post-graduation showed a lower percentage of students anticipating leaving engineering from the 9% population rate to 6% for those with ISL capstone experience and 5% for those with ISL co-curricular experience. These results give reason to consider more frequent incorporation of ISL projects into engineering courses such as senior capstone design.
Measuring Sustainability: Why and How Public-Private Partnerships Achieve Envision's Platinum Verification
Vicchio, Nicolas (Virginia Tech, 2021-06-11)
Public-private partnerships (P3) are outperforming other delivery methods in their ability to meet sustainability objectives. The main driver for decisions in any project has been seen as linked to a cost analysis. This research aims to determine why and how P3 projects are more likely to implement more effective sustainable decisions throughout a project's lifecycle. In this context, the decision-making is directed explicitly at the project team's reasoning for implementing sustainable practices beyond cost-effectiveness. The researcher generated questions to ask potential project teams to understand why and how P3 projects were better at implementing sustainable decisions. Sustainability was operationalized using Envision's framework. Interviews with project teams that utilized the P3 project delivery method and received the highest sustainability rating provided a first-hand account of the decision-making process. The interviews are analyzed utilizing framework analysis. The results will identify the motivations for implementing sustainability. The results suggest that the P3 contract structure is the most compelling reason these projects can implement sustainable decisions better than other project delivery methods. The written requirements from the contract documents or legislative requirements and the Contractor's desire to do a good job are other drivers for this increased sustainability.
Micro-aggression Stories at Virginia Tech
Albright, Kathryn Clarke; Iorio, Josh (2018-09)
Micro-aggressions are everyday verbal and nonverbal slights, snubs or insults that have a negative long-term impact. Many individuals who experience micro-aggressions have learned to ignore them out of necessity, but their cumulative effect can lead to frustration, anger, conflict, isolation, and withdrawal. Over time, these effects can create a negative climate where faculty, staff, and students feel unwelcome and are unable to thrive. This exhibition includes a series of fictionalized stories based on narratives submitted by CAUS faculty, staff, and students about how microaggressions impact their daily lives. The stories include micro-aggressions focused on race, ethnicity, gender, age, mental health, and political affiliation. They include examples that result from explicit bias or from systematic discrimination and most stories include micro-aggressions that result from unconscious bias. Our intent with this project is for exhibition visitors to see themselves and their own experiences in the stories, which we hope will lead to awareness and open conversations. These conversations can be awkward and difficult; but very necessary. It’s opening a dialogue and having the courage to participate. It’s realizing what we say matters; and acknowledging what is said to us, affects us. This exhibition demonstrates that micro-aggressions are a shared experience for most people. Regardless of who you are, what you believe or where you’re from, you’ve probably been a micro-aggressor and have been micro-aggressed. This shared experience brings us all together, which is a good place to start the conversation.
Understanding the Dimensions of International Engineering Programs in Higher Education: A Qualitative Study with Faculty and Students
Baugher, Brooke Erin (Virginia Tech, 2023-07-06)
Universities across the United States have integrated international experiences into their engineering students' education. International engineering programs provide learning and professional opportunities for participating faculty and students while aiding international partners in their own efforts. These programs are unique from traditional engineering courses and projects and generate outcomes desired for engineers entering the workforce including professional skills, critical thinking skills, and a strong understanding of their target audiences. While individual programs have explored the impacts of their programs on their students and their resulting project outcomes, there are significant gaps when considering the following: 1) how are programs structured, 2) what are the intended learning outcomes, 3) why do faculty participate in these programs, 4) how are relationships formed and maintained with international partners, and 5) what barriers exist that limit international engineering programs? To address these gaps, I interviewed 25 program faculty and 40 students. Through qualitative analysis of these interviews, I found that programs shared a common consideration for the program's focus on student learning or achieving international partner goals. Programs approached both structure and learning outcomes with either more emphasis on one or the other; balancing these two goals was a challenge for most programs. Faculty were motivated to participate in international engineering programs by their own intrinsic values, however, many felt limited when in traditional tenure track positions. Students tended to reflect more deeply and from a systems perspective the more exposure and time in a program. Students who engaged in either multiple programs or longer participation within a program tended to reflect their experiences contributed more to their current and future career plans. Partners were typically developed initially through personal relationships of the faculty members or through third-party organizations that specialize in international work. Maintaining relationships was highly varied between programs, but a common deficit among programs was the ability to evaluate project outcomes with partners in a numerical way. The examination of these questions about international engineering programs provides a foundation of knowledge for future programs to build on and for existing programs to compare their approaches. This is a critical step to implementing these types of programs in a more widespread and intentional way.

Browsing by Author "Iorio, Josh"

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