Advances in time-domain induced polarization monitoring with application on chlorinated solvents contamination : Towards scalable real-time geophysical monitoring

Environmental pollution is a significant concern for scientists, practitioners, authorities and the society. Among the various pollutants, chlorinated solvents pose a considerable risk to our groundwater resources. These hazardous chemicals, often used in industrial processes, can contaminate soil and water, posing a threat to both human health and ecosystems. Detecting and tracking the spread of these contaminants is crucial to prevent further damage and facilitate remediation efforts.The research focuses on developing and refining a technique called direct current resistivity and time-domain induced polarization (DCIP) monitoring, which is a geophysical method to measure the electrical properties of subsurface materials. The method can provide images of the subsurface, like medical imaging, showing the change of the electrical properties over time. By tracking those changes researchers can monitor dynamic processes in the ground. The focus of the study is to use the methodology to follow changes that happen in the ground following an in-situ bioremediation treatment of a site contaminated with chlorinated solvents.The research shows that the joint use of geophysical and hydrochemical data enhances the overall understanding of in-situ remediation processes and indicates that the ongoing remediation is successfully reducing the concentration of contaminants in the ground. While geophysical imaging can potentially provide qualitative answers in areas where it is challenging to collect water samples, follow-up mostly relies on groundwater sampling to delineate information regarding the concentration of contaminants. Furthermore, the study highlights the importance of considering seasonal variations in data interpretation, as well as the need for consistent water sampling during the same period. Geophysical imaging offers insights into the spreading of injected fluids, while groundwater chemistry data is crucial for a qualitative analysis of contaminants in the water. Together, these methods complement each other to better understand the changes occurring during in-situ remediation experiments. Also, the study demonstrates the importance of using a multimethod geophysical approach together with auxiliary data to update existing geological models and improve the understanding regarding the subsurface conditions prior to a monitoring experiment.In the rapidly evolving field of geoelectrical monitoring, managing and interpreting large volumes of data is a constant challenge. The research study presents an efficient methodology that simplifies the process of collecting, processing, and displaying geoelectrical monitoring data, making it more accessible and user-friendly for experts and stakeholders alike. One of the most interesting aspects of this research is its scalability. The newly developed methods can be readily applied to small- and large-scale monitoring projects, making it a cost-effective and practical solution for environmental protection agencies and industries alike. With the ability to track in-situ bioremediation experiments in real-time, authorities can respond more quickly to mitigate the spread of pollutants, saving precious time and resources in the process. Furthermore, the research shows great potential in other geophysical monitoring applications

A methodology for the 'live' capture and reuse of project knowledge in construction

The importance of capturing and sharing useful knowledge from construction projects has been recognised by the construction industry. However, issues such as the loss of important insights due to the time lapse in capturing the knowledge, the need for sharing the knowledge captured as soon as possible in order to maximise the benefits brought about by reusing the knowledge, and the need to share the knowledge before the opportunities for reusing the knowledge diminish have not been adequately addressed. To address this, it is crucial for knowledge to be captured as soon as possible once it is created or identified (i.e. 'live') in a collaborative environment, and presented in a format that will facilitate its reuse during and after the project. This research was aimed at developing a methodology that facilitates the `live' capture and reuse of project knowledge in construction. An extensive literature review was first conducted on the concept of knowledge management and the current practices for managing project knowledge. Subsequently, case studies involving six companies were carried out to investigate the shortcomings of current practice and the end-user requirements for the capture and reuse of project knowledge. These requirements informed the development of the methodology for `live' capture and reuse of project knowledge. The Web IS Development Methodology (Avison and Fitzgerald, 2003) employing ASP. NET 2.0 was adopted to encapsulate the methodology into a Web-based prototype application. The evaluation of the prototype revealed that the methodology can enable project knowledge to be captured and shared `live' across different organisations without significant additional workload and costs. It is concluded that the `live' capture and reuse of project knowledge in construction is important in preventing knowledge loss and helping to harness the project knowledge captured. A combination of both KM technologies and techniques is essential for the effective management of tacit and explicit knowledge. The prototype application developed can facilitate the `live' capture and reuse of project knowledge as shown by the results of the evaluation. There is scope for enhancing this study by exploring the integration of the prototype application with other information systems, and the use of software agents to automatically locate useful knowledge from the Internet and project extranets. The methodology developed will help construction organisation to leverage their knowledge in a timely way to meet the challenge of today's fast evolving world

Doctor of Philosophy

dissertationPublic health surveillance systems are crucial for the timely detection and response to public health threats. Since the terrorist attacks of September 11, 2001, and the release of anthrax in the following month, there has been a heightened interest in public health surveillance. The years immediately following these attacks were met with increased awareness and funding from the federal government which has significantly strengthened the United States surveillance capabilities; however, despite these improvements, there are substantial challenges faced by today's public health surveillance systems. Problems with the current surveillance systems include: a) lack of leveraging unstructured public health data for surveillance purposes; and b) lack of information integration and the ability to leverage resources, applications or other surveillance efforts due to systems being built on a centralized model. This research addresses these problems by focusing on the development and evaluation of new informatics methods to improve the public health surveillance. To address the problems above, we first identified a current public surveillance workflow which is affected by the problems described and has the opportunity for enhancement through current informatics techniques. The 122 Mortality Surveillance for Pneumonia and Influenza was chosen as the primary use case for this dissertation work. The second step involved demonstrating the feasibility of using unstructured public health data, in this case death certificates. For this we created and evaluated a pipeline iv composed of a detection rule and natural language processor, for the coding of death certificates and the identification of pneumonia and influenza cases. The second problem was addressed by presenting the rationale of creating a federated model by leveraging grid technology concepts and tools for the sharing and epidemiological analyses of public health data. As a case study of this approach, a secured virtual organization was created where users are able to access two grid data services, using death certificates from the Utah Department of Health, and two analytical grid services, MetaMap and R. A scientific workflow was created using the published services to replicate the mortality surveillance workflow. To validate these approaches, and provide proofs-of-concepts, a series of real-world scenarios were conducted

Information technologies for pain management

Millions of people around the world suffer from pain, acute or chronic and this raises the importance of its screening, assessment and treatment. The importance of pain is attested by the fact that it is considered the fifth vital sign for indicating basic bodily functions, health and quality of life, together with the four other vital signs: blood pressure, body temperature, pulse rate and respiratory rate. However, while these four signals represent an objective physical parameter, the occurrence of pain expresses an emotional status that happens inside the mind of each individual and therefore, is highly subjective that makes difficult its management and evaluation. For this reason, the self-report of pain is considered the most accurate pain assessment method wherein patients should be asked to periodically rate their pain severity and related symptoms. Thus, in the last years computerised systems based on mobile and web technologies are becoming increasingly used to enable patients to report their pain which lead to the development of electronic pain diaries (ED). This approach may provide to health care professionals (HCP) and patients the ability to interact with the system anywhere and at anytime thoroughly changes the coordinates of time and place and offers invaluable opportunities to the healthcare delivery. However, most of these systems were designed to interact directly to patients without presence of a healthcare professional or without evidence of reliability and accuracy. In fact, the observation of the existing systems revealed lack of integration with mobile devices, limited use of web-based interfaces and reduced interaction with patients in terms of obtaining and viewing information. In addition, the reliability and accuracy of computerised systems for pain management are rarely proved or their effects on HCP and patients outcomes remain understudied. This thesis is focused on technology for pain management and aims to propose a monitoring system which includes ubiquitous interfaces specifically oriented to either patients or HCP using mobile devices and Internet so as to allow decisions based on the knowledge obtained from the analysis of the collected data. With the interoperability and cloud computing technologies in mind this system uses web services (WS) to manage data which are stored in a Personal Health Record (PHR). A Randomised Controlled Trial (RCT) was implemented so as to determine the effectiveness of the proposed computerised monitoring system. The six weeks RCT evidenced the advantages provided by the ubiquitous access to HCP and patients so as to they were able to interact with the system anywhere and at anytime using WS to send and receive data. In addition, the collected data were stored in a PHR which offers integrity and security as well as permanent on line accessibility to both patients and HCP. The study evidenced not only that the majority of participants recommend the system, but also that they recognize it suitability for pain management without the requirement of advanced skills or experienced users. Furthermore, the system enabled the definition and management of patient-oriented treatments with reduced therapist time. The study also revealed that the guidance of HCP at the beginning of the monitoring is crucial to patients' satisfaction and experience stemming from the usage of the system as evidenced by the high correlation between the recommendation of the application, and it suitability to improve pain management and to provide medical information. There were no significant differences regarding to improvements in the quality of pain treatment between intervention group and control group. Based on the data collected during the RCT a clinical decision support system (CDSS) was developed so as to offer capabilities of tailored alarms, reports, and clinical guidance. This CDSS, called Patient Oriented Method of Pain Evaluation System (POMPES), is based on the combination of several statistical models (one-way ANOVA, Kruskal-Wallis and Tukey-Kramer) with an imputation model based on linear regression. This system resulted in fully accuracy related to decisions suggested by the system compared with the medical diagnosis, and therefore, revealed it suitability to manage the pain. At last, based on the aerospace systems capability to deal with different complex data sources with varied complexities and accuracies, an innovative model was proposed. This model is characterized by a qualitative analysis stemming from the data fusion method combined with a quantitative model based on the comparison of the standard deviation together with the values of mathematical expectations. This model aimed to compare the effects of technological and pen-and-paper systems when applied to different dimension of pain, such as: pain intensity, anxiety, catastrophizing, depression, disability and interference. It was observed that pen-and-paper and technology produced equivalent effects in anxiety, depression, interference and pain intensity. On the contrary, technology evidenced favourable effects in terms of catastrophizing and disability. The proposed method revealed to be suitable, intelligible, easy to implement and low time and resources consuming. Further work is needed to evaluate the proposed system to follow up participants for longer periods of time which includes a complementary RCT encompassing patients with chronic pain symptoms. Finally, additional studies should be addressed to determine the economic effects not only to patients but also to the healthcare system

Evaluating information flow in medication management process in Australian acute care facilities: A multi-professional perspective

Over the years, various interventions have been introduced to improve the medication management process. While these interventions have addressed some aspects predisposing the process to inefficiencies, significant gaps are still prevalent across the process. Studies have suggested that the goal of optimal medication therapy is achievable when information flow integrates across the various medication management process phases, stakeholders and departments involved as the patient moves through the process. To provide a cross-sectional view of the process, this study utilised a systemic philosophy to evaluate the information flow integration across the process. The research approach adopted for this study takes a positivist paradigm, which is guided by the cause and effect (causality) belief. It explored numeric measures to evaluate the relationship between constructs that assessed information flow principles (accessibility, timeliness, granularity and transparency) within the medication process and the information integration. The research design was cross-sectional and analytical, and this ensures that findings are relevant to current situations across the Australian healthcare system. Data for this research was collected using an online self-administered survey and the data assessed information flow principles and technologies used in the medication management process. There were 88 participants in this study, including doctors, nurses and pharmacists. The questions and responses were coded for analysis and data analysis techniques used were frequency analysis, Pearson’s chi-square test and multivariate analysis. Findings from this study indicates that the constructs evaluating accessibility, transparency and granularity had moderate associations with the information integration in the medication management process. Further analysis highlighted accessibility as a significant principle in explaining an increase or decrease in information integration in the medication management process. The accessibility construct referring to information retrieval was significant across the two tests conducted. Accessibility is directly related to information sharing and the assessment and monitoring and evaluation phases in the medication management process were identified as having the highest challenges with information sharing. Furthermore, the hybrid (electronic and paper) channel was preferred to support information integration in the medication management process by the participants. Among the technologies evaluated for the medication process, computer-provider-order-entry was found to be statistically significant in explaining an increase in information integration. Overall, results from this study suggest that interventions for the medication management process in Australian acute care facilities should be directed towards improving accessibility, specifically information retrieval and the sharing of information with emphasis on the assessment and monitoring phases. Implementing strategies to address the gaps identified from this research can improve information integration across the process and thereby reducing medication errors, and improving patient care management. Furthermore, the technology adoption across the process highlights that technology adoption across participants’ facilities remains a challenge in Australia

A methodology for the 'live' capture and reuse of project knowledge in construction

The importance of capturing and sharing useful knowledge from construction projects has been recognised by the construction industry. However, issues such as the loss of important insights due to the time lapse in capturing the knowledge, the need for sharing the knowledge captured as soon as possible in order to maximise the benefits brought about by reusing the knowledge, and the need to share the knowledge before the opportunities for reusing the knowledge diminish have not been adequately addressed. To address this, it is crucial for knowledge to be captured as soon as possible once it is created or identified (i.e. 'live') in a collaborative environment, and presented in a format that will facilitate its reuse during and after the project. This research was aimed at developing a methodology that facilitates the `live' capture and reuse of project knowledge in construction. An extensive literature review was first conducted on the concept of knowledge management and the current practices for managing project knowledge. Subsequently, case studies involving six companies were carried out to investigate the shortcomings of current practice and the end-user requirements for the capture and reuse of project knowledge. These requirements informed the development of the methodology for `live' capture and reuse of project knowledge. The Web IS Development Methodology (Avison and Fitzgerald, 2003) employing ASP. NET 2.0 was adopted to encapsulate the methodology into a Web-based prototype application. The evaluation of the prototype revealed that the methodology can enable project knowledge to be captured and shared `live' across different organisations without significant additional workload and costs. It is concluded that the `live' capture and reuse of project knowledge in construction is important in preventing knowledge loss and helping to harness the project knowledge captured. A combination of both KM technologies and techniques is essential for the effective management of tacit and explicit knowledge. The prototype application developed can facilitate the `live' capture and reuse of project knowledge as shown by the results of the evaluation. There is scope for enhancing this study by exploring the integration of the prototype application with other information systems, and the use of software agents to automatically locate useful knowledge from the Internet and project extranets. The methodology developed will help construction organisation to leverage their knowledge in a timely way to meet the challenge of today's fast evolving world.EThOS - Electronic Theses Online ServiceGBUnited Kingdo

Data Visualization Collection. How graphical representation can inspect and communicate sustainability through systemic design.

Big data are totally changing the business rules, the society, as well as the perception of ourself. The need of a big data oriented culture is becoming essential for everything that has an informative asset. Furthermore, technological innovation offers products and features unique that can help to convey values and meanings, for the purpose of communication based on increasingly strong interaction between people. In a world where everything is consumed in a short time, it is important to turn information as visual as possible, making simple what is complex. The visualization becomes a medium for increasing cognitive perception of the beholder, easing reasoning and storing of the information represented, showing patterns and relationships, known or not, maybe not easily visible without the aid of a visual representation of information