Browsing by Author "Pethtel, Ray D."
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- 3D Visualization of Highway Corridors: The I-77/81 Case Study near Wytheville, VAThota, Pramod Reddy (Virginia Tech, 2002-05-07)The application of Visualization and Simulation technologies to intuitively depict, analyze and execute transportation projects is gaining momentum, as advances in 3-Dimension (3D) Geographic Information Systems (GIS) technologies are rapidly progressing and there is an increased need for public acceptance of transportation projects. This thesis presents a visualization process framework that is applicable to highway corridor visualization, and the I-77/81 Relocation Study Visualization project is discussed along the lines of the visualization framework that has been developed. The changes in the roadway alignment and associated traffic volume and pattern changes will affect the town of Wytheville, both in terms of economy and community development. The goal of the project is to present these visualizations at public participation meetings. Visualizations that have been developed in 2D, 3D, 4D, and virtual reality, will be discussed along with their developmental life cycles and issues affecting their quality.
- An Analysis and Critique of DEM Creaion and 3-D Modeling Using Airborne LIDAR and Photogrammetric TechniquesGagné, Marissa Marlene (Virginia Tech, 2001-06-22)Three-dimensional (3D) visualization is rapidly becoming an important tool for many engineering projects. Accurate digital representations of terrain and ground features are extremely useful for efficient design, communication and data representation in projects involving land development, transportation planning, hydrologic analysis, environmental impact studies, and much more. Within the scope of terrain modeling lie a wide variety of techniques used to build digital elevation models (DEMs). Each approach has inherent problems and difficulties that can alter the accuracy and usability of the DEM produced. The main objectives of this study are to examine the various methods used for the creation of digital elevation models and make recommendations as to the appropriate techniques to use depending on specific project circumstances. Data sets generated using two of the methods, photogrammetry and LIDAR, are used to build digital terrain models in various software packages for an analysis of data usability and function. The key results of this research project are two DEMs of a real-world transportation study area and a set of conclusions and recommendations that give insight into the exact methods to be used on various projects. The paper ends with two short appendices, the first of which discusses several software packages and their effectiveness in DEM creation and 3-D modeling. The final appendix is a flow chart summarizing the recommendations for the seven DEM creation methods.
- Automatic Ultrasonic Headway Control for a Scaled Robotic CarHenry, Richard Douglas (Virginia Tech, 2001-12-18)Intelligent Transportation Systems and supporting technologies have been an active area of research for some time. Human drivers exhibit slower response times and errors in judgment that can have serious adverse affects on traffic flow. These types of errors can be reduced or eliminated from the driving experience by introducing computer control systems into the automotive arena. The purpose of this research was to develop a scale model platform for the rapid prototyping and testing of ITS systems and technologies. Specifically, this body of work was concerned with the development of an automatic headway control system that utilized ultrasonic sensors. This control system was intended to automatically maintain headway distance in an effort to create an adaptive cruise control system for this scale model vehicle. Implementation of such systems could conceivably reduce driver fatigue by removing the burden of maintaining safe following distance from the driver. System dynamics of car-like robots with nonholonomic constraints were employed in this research to create a controller for an autonomous path following vehicle. The application of a working kinematic model describing car-like robotic systems allowed the development of a simple first order controller, as well as a sliding mode controller. Following the development and simulation of these two control laws, the system was applied to the FLASH project scale model vehicle to assess the practical use of the system on a mock highway. A satisfactory result is produced after testing was completed, and the application of such systems to scale model platforms is feasible.
- Building Implementation Networks: Building Multi-organizational, Multi-sector Structures for Policy ImplementationSchroeder, Aaron D. (Virginia Tech, 2001-01-24)The purpose of this dissertation is the delineation of a new approach, or, more precisely, a new "role" and "methodological system," for those persons engaged in building and managing multi-actor structures, or "networks," for the purpose of policy implementation. As policy formulation and implementation can be viewed increasingly as taking place inter-organizationally, and consisting of individuals, special-interest groups, public organizations, private organizations, non-profits, etc., none of whom have the individual power to autonomously determine the strategies and actions of all the other actors, policy processes can no longer be viewed as the implementation of ex ante formulated goals, but instead must be seen as an interaction process in which actors exchange information about problems, preferences and means, and trade-off goals and resources. That is, the context of "getting things done" in the public sector is changing from a singular organizational context to a multiple-organization network context. Managerially, we must respond accordingly. While there has been an increasing recognition in the literatures of at least three distinct fields of enquiry [political science, organization theory, and policy science] that such networks are becoming the "reality" of daily operation, much less has been written attempting to aid the acting administrator to function successfully within this new setting. Even less has been written concerning how to actually build and use a network setting to one's advantage in an implementation endeavor. We are left in need of a new way to successfully approach implementation through complex multi-actor settings. As it becomes increasingly difficult to administer policy implementation through a single, public organization, the need for new tools and understanding that will enable us to achieve public ends in such complex settings becomes apparent. Such an approach must work to successfully accommodate the increased role of extra-organizational actors, a new role of the administrator as "network facilitator," and still afford the ability to plan for and carry out project implementation. Because the invention of such an approach will require the accommodation of a different view of the administrative world (i.e. a more dynamic context, ephemeral definitions, new roles and responsibilities, and a new method to approaching work life), its development cannot constitute a straightforward reshuffling of the boxes of the administrative process, or the simple adoption of some new buzzwords. It demands, instead, that we begin by asking some fundamental ontological (what is reality) and epistemological (how can we know it) questions. It is after addressing these fundamental concerns that this volume will work to build a new approach to functioning proactively in a network setting. Following a discussion on what the role of "network facilitator" means in relation to current understanding of public management, this treatise will describe a new methodological system for use by the administrator playing such a role. The "methodological system" for building implementation networks that is advocated here is composed of three overlapping methodologies: 1) "Contextual Assessment" - Mapping a Network's Political-Economy; 2) "Stakeholder Analysis & Management" — Understanding Who Should be at the Table and Furthering the Conditions for Cooperation; and, 3) "Joint Visioning" " The Facilitation of Project Planning in a Network Setting. In the chapter on "contextual assessment," the reader will be introduced to a method that uses the political economy framework of Wamsley and Zald to derive an interview instrument for use by a recently appointed network facilitator (somebody appointed the responsibility of "getting something done" cross-organizationally). Combining the political economic framework with other standard qualitative methods, including gaining entrance, selecting interview type, snowballing, and quota sampling, one should be able to assess the existing political and economic environment surrounding a potential implementation network and, further, begin to select from that environment a first set of stakeholders in the budding implementation network. This method will result in a "conceptual mapping" of the environment from which one may begin to select potential resources to build an implementation network. Following that, the reader will be introduced to two methods, that when used together, will allow for the analysis, categorization, and selection of network stakeholders. Taken together, these methods can be referred to as "stakeholder analysis." It is the successful selection and management of these stakeholders that will result in the formation of a young implementation network. Finally, the reader will be introduced to a method of "joint-visioning," a process for working with a set of stakeholders to create a shared understanding of the social/organizational and technical/functional systems required for a new implementation network to function. While the theoretical conception here of joint-visioning is new, the techniques suggested to support this method are probably the least original of the techniques associated with the three methods introduced in this volume (in that they are based on recognized methods of group facilitation). The joint-visioning method proposed here is probably most remarkable for what it is not, corporate strategic planning. A discussion about the problems of adopting corporate strategic planning in the public sector will begin this section, followed by a discussion of why something else, like joint visioning, is probably more appropriate. Each methodology has been constructed from the ground up by appropriating parts of different methodologies that have been advocated in different areas of application. Specifically, methods, approaches, and understandings have been appropriated from the literatures of corporate management, stakeholder analysis, action research, political economy, community facilitation, knowledge engineering and management, and strategic planning. These methods have been combined and modified to better serve as tools for network establishment and management. This methodological system has been developed as much from experience as from scholarly analysis. Accordingly, a case study, one that has directly led to the development of many concepts in this system, will be discussed and used for "real-world" elaboration of the concepts described. Specifically, each of these methods will be accompanied by an in-depth discussion on how it was applied in the "Travel Shenandoah" case study. Benefits, as well as problems with the proposed methods will be highlighted. Where appropriate, possible modifications to a method will be suggested.
- Community Learning: Process, Structure, and RenewalMorse, Ricardo Stuart (Virginia Tech, 2004-04-29)Community renewal is a dominant theme in American society today. It has been said that public administration could and should be a leader in the community renewal movement, yet for the most part the field of public administration fails to "get" community. This study advances and explores a concept of community learning as part of a broader effort to better understand what a community perspective means for public administration theory and practice. The contributions of this study are two-fold. First, a concept of community learning is drawn from a variety of literature streams that share an ethos of collaborative pragmatism. Community learning occurs when the knowledge created in the integrative "community process" is fed-forward and embedded at the level of community structure. Furthermore, a "learning community" is found where the community learning process is institutionalized at the level of community structure. While community learning is a term being used to some degree in the field of community development, a concept of how communities might learn has yet to be offered. Thus, the conceptualization offered here seeks to fill this gap in the literature. This study also explores the community learning concept empirically in the context of an action research project in Wytheville, Virginia. Here participants worked with a Virginia Tech research team to better understand their community and develop a unified "vision" for the community's future. The study revealed that the collective or collaborative learning of the "community process" can occur over time and also in the form of punctuated group "a-ha" moments. In either case, the learning process is one where new knowledge is created in the form of new or altered shared meaning or new ideas. This learning was fed-forward to the community level to become community learning in three ways: 1) as the learning took place in the community field, meaning the participants of the learning process represented the different institutions that make up community structure; 2) through the integrative medium of local media outlets; and 3) through formal and informal processes of knowledge transfer from the group to community level, where the community level was represented by a citizens committee. As communities institutionalize learning processes they can be said to be "learning communities." Evidence from the Wytheville study provides insights into how this might happen. The implications for the practice of a "new public service" are explored as well as future areas of research relevant to the community learning approach. The study concludes by suggesting what a community perspective for public administration might mean as community learning is a concept based in this perspective.
- Community Visioning in Long-Range Transportation Planning: A Case Study of VirginiaStich, Bethany Marie (Virginia Tech, 2006-05-05)This research is an evaluation of the addition of a citizen involvement process that has come to be known as "visioning" or "community visioning" to the traditional process of developing a state's transportation plan, a process which has typically been very much an in-government and esoteric province of professionals in transportation planning. The research specifically focuses on the Commonwealth of Virginia and its addition of three citizen participation components the Commonwealth labeled "community visioning" to the traditional transportation planning process. The research examines the three components of "community visioning" with regard to: (1) their impact on the state's transportation plan (VTrans2025); (2) the degree to which they met the expectations of the regulations and best practices requirements of federal oversight; (3) the degree to which they met the expectations of the advocates of visioning and of more "democratic participation" in pubic administrative and policy processes; and (4) the degree to which they could affect the final outcome of transportation policy. Visioning is a relatively new approach to citizen involvement in the planning process. It places the citizen involvement at the beginning of the process instead of the end. Visioning asks citizens key questions about what they envision as a positive future for their community. The purpose or goal of this new visioning is to have the final plans reflect the vision drawn from the citizens and public officials and reached through consensus. This dissertation determined that Virginia put forth a good faith effort to involve citizens of the Commonwealth. Collectively, the citizen involvement activities in VA’s visioning process were reasonable and meaningful. Additionally, Virginia’s vision statement was heavily influenced by the citizen participation activities. However, there are three aspects of Virginia’s vision that are troubling from an implementation standpoint. In short, this dissertation found that the vision is what the people want, but the comprehensive plan does not tell the citizens how the Commonwealth intends on achieving that vision.
- The Development of Mathematical Models for Preliminary Prediction of Highway Construction DurationWilliams, Robert C. (Virginia Tech, 2008-11-04)Knowledge of construction duration is pertinent to a number of project planning functions prior to detailed design development. Funding, financing, and resource allocation decisions take place early in project design development and are significantly influenced by the construction duration. Currently, there is not an understanding of the project factors having a statistically significant relationship with highway construction duration. Other industry sectors have successfully used statistical regression analysis to identify and model the project parameters related to construction duration. While the need is seen for such work in highway construction, there are very few studies which attempt to identify duration-influential parameters and their relationship with the highway construction duration. This research identifies the project factors, known early in design development, which influence highway construction duration. The factors identified are specific to their respective project types and are those factors which demonstrate a statistically-significant relationship with construction duration. This work also quantifies the relationship between the duration-influential factors and highway construction duration. The quantity, magnitude, and sign of the factor coefficient yields evidence regarding the importance of the project factor to highway construction duration. Finally, the research incorporates the duration-influential project factors and their relationship with highway construction duration into mathematical models which assist in the prediction of construction duration. Full and condensed models are presented for Full-Depth Section and Highway Improvement project types. This research uses statistical regression analysis to identify, quantify, and model these early-known, duration-influential project factors. The results of this research contribute to the body of knowledge of the sponsoring organization (Virginia Department of Transportation), the highway construction industry, and the general construction industry at large.
- Intelligent Transportation Systems: A Multilevel Policy NetworkKim, Dong Won (Virginia Tech, 2001-06-14)This dissertation is a descriptive study of a policy network designed for U.S. government and global cooperation to promote Intelligent Transportation Systems (ITS). It is aimed at exploring the historical and structural features of the ITS policy network, and evaluating its roles in the policy process. Until now, the network literature has barely examined the full arrays of networks, catching just part of their full pictures. First, this study draws attention to transnational networks and their organic or systematic relationships with lower levels of networks. Second, it examines the individual properties and synergy of three core elements of the ITS policy network: public-private partnerships, professional networks, and intergovernmental networks. Third, it takes a close look at the pattern of stability change and power relations of the policy network from within the net. Finally, this study discusses what difference networks make, compared to hierarchies and markets. This dissertation employed multiple sources of evidence: unstandardized elite interviews, government documents, and archival records. Through a networking strategy to find the best experts, face-to-face, telephone, and e-mail interviews were conducted with twenty-two public officials and ITS professionals. It was found that the U.S. ITS policy network was a well-designed strategic governance structure at the planning level, but an experimental learning-focused one at the implementation level. It was initially designed by a new, timely, cross-sectional coalition, which brought together field leaders from both the public and the private sectors under the slogan of global competitiveness. Yet, day-to-day managers within the net often experience much more complex power relationships and internal dynamics as well as legal obstacles; also, they confront external uncertainty in political support and market. For better results, policy networks should be designed in flexible ways that will handle their disadvantages such as ambiguous roles, exclusiveness, and increased staff time. In this respect, it is inevitable for the networks to include some components of a wide range of conventional structures, ranging from highly bureaucratic to highly entrepreneurial, on the one hand, and ranging between issue networks (grounded in American pluralism) and policy communities (based on European corporatism), on the other hand.
- Investigation of Community Annoyance as Invoked by a High School Stadium and a Train Horn Proximal to Residentially Zoned HomesBaker, Aubrey Anne (Virginia Tech, 2015-07-17)The effects of two different noise sources upon their surrounding communities were investigated with both quantitative and qualitative measures. A high school football game, which presents continuous noise over a relatively short duration on a predictable schedule was found to have a slight annoyance on its surrounding community. In contrast, a train horn blow at a residential intersection was investigated. This sound was unpredictable and could occur at any time. Residents in this community were found to have a moderate level of annoyance. It was found that each of the noises studied violated suggested noise levels for common household activities, in addition to many local, state, and federal noise regulations. It is recommended that both of the sounds studied herein be reduced or eliminated altogether. Limiting the level of sound produced by the PA system at the football game and using a noise reducing barrier would help in the case of the football game. Converting the railroad intersection into one with sufficient safety features, especially a crossing quad-gate that no longer requires trains to blow their horns would be the optimal solution, with the added benefit of precluding vehicles from entering the crossing when a train is present.
- A policy review of the impact existing privacy principles have on current and emerging transportation safety technologyPethtel, Ray D.; Phillips, James D.; Hetherington, Gene (National Surface Transportation Safety Center for Excellence, 2011-05-12)Ensuring the safety of travelers by the use of technology, and protecting the personal information that is collected for those applications, is an important transportation policy concern. Perceptions of an abuse of privacy protection is a growing obstacle to speed monitoring and red-light-running applications. Many states and numerous localities have barred the use of technology for these safety applications. This report offers a detailed review, from a legal and operational perspective, of how personal privacy is (or is not) protected. Two unique sections contained in the report are (1) a state-by-state and court-involved inventory of relevant laws, and (2) a survey of the members of ITS America questioning how developers, manufacturers, operators, marketers, researchers, and deplorers of transportation technology comply with current privacy principles. -- Report website.