1,298 research outputs found

    Under construction: infrastructure and modern fiction

    Full text link
    In this dissertation, I argue that infrastructural development, with its technological promises but widening geographic disparities and social and environmental consequences, informs both the narrative content and aesthetic forms of modernist and contemporary Anglophone fiction. Despite its prevalent material forms—roads, rails, pipes, and wires—infrastructure poses particular formal and narrative problems, often receding into the background as mere setting. To address how literary fiction theorizes the experience of infrastructure requires reading “infrastructurally”: that is, paying attention to the seemingly mundane interactions between characters and their built environments. The writers central to this project—James Joyce, William Faulkner, Karen Tei Yamashita, and Mohsin Hamid—take up the representational challenges posed by infrastructure by bringing transit networks, sanitation systems, and electrical grids and the histories of their development and use into the foreground. These writers call attention to the political dimensions of built environments, revealing the ways infrastructures produce, reinforce, and perpetuate racial and socioeconomic fault lines. They also attempt to formalize the material relations of power inscribed by and within infrastructure; the novel itself becomes an imaginary counterpart to the technologies of infrastructure, a form that shapes and constrains what types of social action and affiliation are possible

    Data Analytics for Smart Buildings

    Get PDF

    Acoustic Propagation Variation with Temperature Profile in Water Filled Steel Pipes at Pressure

    Get PDF
    Conventional pressure leak testing of buried pipelines compares measurements of pressure with pipe wall temperature. An alternative proposed method uses acoustic velocity measurements to replace pipe wall temperature measurements. Early experiments using this method identified anomalous results of rising acoustic velocities thought to be caused by air solution. This research investigated the anomalous acoustic velocity measurements by evaluation of acoustic velocity variation with pressure, temperature and air solution. Quiescent air solution rate experiments were carried out in water filled pipes. Computer modelling of the air bubble shape variation with pipe diameter was found to agree with bubble and drop experiments over the pipe diameter range from 100 mm to 1000 mm. Bubbles were found to maintain constant width over a large volume range confirmed by experiments and modelling

    The energization of KwaBhaza : a case study in rural energy and development

    Get PDF
    Energization can be described as a form of integrated energy delivery. In the case of the KwaBhaza Pilot Project, PV and LPGas were combined. in a package and offered to rural households. While the approach to off-grid electrification and distributed energy services tends to emphasise the technical aspects of delivery (Kotze 1998), this work provides some insight into the anthropological aspects that hinder the implementation of such initiatives. In this context, 'anthropological aspects' do not refer to cultural conditions in the field but rather the anthropology of development, expressed as a holistic examination of the project and a critical assessment of the development framework within which it operates. It is with this in mind that the objectives of energization, as a development initiative, are thoroughly explored

    Efficient Security Protocols for Constrained Devices

    Get PDF
    During the last decades, more and more devices have been connected to the Internet.Today, there are more devices connected to the Internet than humans.An increasingly more common type of devices are cyber-physical devices.A device that interacts with its environment is called a cyber-physical device.Sensors that measure their environment and actuators that alter the physical environment are both cyber-physical devices.Devices connected to the Internet risk being compromised by threat actors such as hackers.Cyber-physical devices have become a preferred target for threat actors since the consequence of an intrusion disrupting or destroying a cyber-physical system can be severe.Cyber attacks against power and energy infrastructure have caused significant disruptions in recent years.Many cyber-physical devices are categorized as constrained devices.A constrained device is characterized by one or more of the following limitations: limited memory, a less powerful CPU, or a limited communication interface.Many constrained devices are also powered by a battery or energy harvesting, which limits the available energy budget.Devices must be efficient to make the most of the limited resources.Mitigating cyber attacks is a complex task, requiring technical and organizational measures.Constrained cyber-physical devices require efficient security mechanisms to avoid overloading the systems limited resources.In this thesis, we present research on efficient security protocols for constrained cyber-physical devices.We have implemented and evaluated two state-of-the-art protocols, OSCORE and Group OSCORE.These protocols allow end-to-end protection of CoAP messages in the presence of untrusted proxies.Next, we have performed a formal protocol verification of WirelessHART, a protocol for communications in an industrial control systems setting.In our work, we present a novel attack against the protocol.We have developed a novel architecture for industrial control systems utilizing the Digital Twin concept.Using a state synchronization protocol, we propagate state changes between the digital and physical twins.The Digital Twin can then monitor and manage devices.We have also designed a protocol for secure ownership transfer of constrained wireless devices. Our protocol allows the owner of a wireless sensor network to transfer control of the devices to a new owner.With a formal protocol verification, we can guarantee the security of both the old and new owners.Lastly, we have developed an efficient Private Stream Aggregation (PSA) protocol.PSA allows devices to send encrypted measurements to an aggregator.The aggregator can combine the encrypted measurements and calculate the decrypted sum of the measurements.No party will learn the measurement except the device that generated it

    Demand Response in Smart Grids

    Get PDF
    The Special Issue “Demand Response in Smart Grids” includes 11 papers on a variety of topics. The success of this Special Issue demonstrates the relevance of demand response programs and events in the operation of power and energy systems at both the distribution level and at the wide power system level. This reprint addresses the design, implementation, and operation of demand response programs, with focus on methods and techniques to achieve an optimized operation as well as on the electricity consumer

    Public sector accounting and financial management in the context of a developing country: an empirical study of the Volta River Authority in Ghana

    Get PDF
    Using the Volta River Authority, a major Ghanaian corporation responsible for the generation and distribution of electricity in Ghana and neighbouring countries, as a case study, this thesis seeks to gain an empirical understanding of the nature and effectiveness of accounting and financial management systems in the context of a public sector organisation in a developing country. The principal rationale of the thesis is an attempt to substantiate and illuminate major issues and concerns about the nature of accounting and financial management systems in public sector organisations of developing countries today. The thesis problematises an overly simple view that developing countries have deficient accounting and financial management systems in their public sector organisations. The methodological, epistemological, and ontological orientations of the thesis are consistent with what Chua (1986) labels the “interpretive” paradigm. A recognition of multiple realities in the functioning of accounting enables an exploration of the claim that developing countries have deficient public sector accounting and financial management systems in a three-dimensional fashion. Firstly, the perceptions of organisational actors are drawn upon to aid evaluation of the basic deficiency claim. The research at this level emphasizes the technical-rational view of accounting as a tool for control over organisational financial resources. Thick descriptions of the systems for managing financial resources (including planning, budgeting, pricing, extent of computerisation, financial reporting and audit practices) of the VRA are gathered from organisational actors together with perceptions of the accounting and financial management systems by external constituencies such as the World Bank and the Authority’s multinational audit firms as a basis for evaluating the deficiency claim in the context of the VRA. Secondly, the thesis draws upon social theory (the view of organisations as negotiated orders) to further interpret the deficiency claim by bringing into the analysis the socio-historical circumstances of the organisation and how they help to provide insights into how the systems for financial resource management arise at the VRA. At this level of analysis, the thesis provides an interpretive construction of the technical procedures for financial resource management against the backdrop of the institutional setting within which the Authority conducts its operations. To this end, the influence of external constituencies such as the World Bank and the Volta Aluminium Company (VRA’s major customer) on the Authority’s accounting and financial management systems are explored. Thirdly, the thesis evaluates the effectiveness of the Authority’s accounting and financial management systems with reference to the extent to which they assist in the accomplishment of the principal rationale for establishing the organisation (i.e. socio-economic development of Ghana). At the third level of analysis, the Brundtland Commission’s notion of sustainable development is drawn upon as an alternative to the dominant economistic notion of development to provide a benchmark for the analysis. Employing the Commission’s perspective, the thesis attempts to understand the extent to which VRA’s systems of financial resource management reflect the notion of people-centredness and environmental awareness (i.e. the two major strands of the Commission’s notion of sustainable development). Multiple methods, including interviews, observation, document analysis and survey are employed to collect empirical evidence for this study. The major conclusions of the study are that from a technical-rational perspective, the claim that developing countries generally have deficient public sector accounting and financial management systems could not be established in the context of the VRA. This conclusion derived from the overwhelming positive perception of the Authority’s financial resource management systems by organisational actors, international funding agencies such as the World Bank, and the Authority’s multinational accounting/audit firms. Indeed, the claims about the lack of published annual accounts, inadequate information for managerial decision making, poor budgetary practices, and lack of independent auditors in developing country public sector contexts could not be supported in the case of the VRA. However, by going behind the technical procedures (façade) to uncover the forces which explain how the systems arise, the thesis argued that the deficiency claim might be supported in another sense; a sense which appreciates and problematises the socio-historical and institutional setting which are strongly responsible not only for the nature of the Authority’s current systems but how they have changed over time. In particular, the thesis argues that the systems of financial resource management are constructed partly to legitimise outcomes of prior negotiations between the Authority and its external constituencies. The constraints presented by these prior agreements and contracts render some of the Authority’s systems of financial resource management inconsistent with explanations grounded in conventional accounting and financial management logic. The thesis also finds, however, that some of the inadequacies observed with VRA’s systems of financial resource management reflected general limitations of conventional accounting with its over-emphasis on the entity concept rather than a peculiar organisational or even developing country problem. By employing an interpretive methodological approach to gain an understanding of the nature and effectiveness of accounting in a third world public sector organisational context, this thesis illuminates hitherto relatively unappreciated issues, including furthering an appreciation of accounting as a socio-political artefact in this context, and thus contributes to the critical and interpretive accounting literature

    Short-term forecast techniques for energy management systems in microgrid applications

    Get PDF
    A Dissertation Submitted in Partial Fulfilment of the Requirements for the Degree of Doctor of Philosophy in Sustainable Energy Science and Engineering of the Nelson Mandela African Institution of Science and TechnologyIn the 2015 Paris Agreement, 195 countries adopted a global climate agreement to limit the global average temperature rise to less than 2°C. Achieving the set targets involves increasing energy efficiency and embracing cleaner energy solutions. Although advances in computing and Internet of Things (IoT) technologies have been made, there is limited scientific research work in this arena that tackles the challenges of implementing low-cost IoT-based Energy Management System (EMS) with energy forecast and user engagement for adoption by a layman both in off-grid or microgrid tied to a weak grid. This study proposes an EMS approach for short-term forecast and monitoring for hybrid microgrids in emerging countries. This is done by addressing typical submodules of EMS namely: load forecast, blackout forecast, and energy monitoring module. A short-term load forecast model framework consisting of a hybrid feature selection and prediction model was developed. Prediction error performance evaluation of the developed model was done by varying input predictors and using the principal subset features to perform supervised training of 20 different conventional prediction models and their hybrid variants. The proposed principal k-features subset union approach registered low error performance values than standard feature selection methods when it was used with the ‘linear Support Vector Machine (SVM)’ prediction model for load forecast. The hybrid regression model formed from a fusion of the best 2 models (‘linearSVM’ and ‘cubicSVM’) showed improved prediction performance than the individual regression models with a reduction in Mean Absolute Error (MAE) by 5.4%. In the case of the EMS blackout prediction aspect, a hybrid Adaptive Similar Day (ASD) and Random Forest (RF) model for short-term power outage prediction was proposed that predicted accurately almost half of the blackouts (49.16%), thereby performing slightly better than the stand-alone RF (32.23%), and ASD (46.57%) models. Additionally, a low-cost EMS smart meter was developed to realize the implemented energy forecast and offer user engagement through monitoring and control of the microgrid towards the goal of increasing energy efficiency

    2023-2024 Boise State University Undergraduate Catalog

    Get PDF
    This catalog is primarily for and directed at students. However, it serves many audiences, such as high school counselors, academic advisors, and the public. In this catalog you will find an overview of Boise State University and information on admission, registration, grades, tuition and fees, financial aid, housing, student services, and other important policies and procedures. However, most of this catalog is devoted to describing the various programs and courses offered at Boise State
    corecore