Academic literature on the topic 'Communications engineering not elsewhere classified'
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Journal articles on the topic "Communications engineering not elsewhere classified"
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Rastorguev, S. V. "Modelling of Intergenerational Communications." Humanities and Social Sciences. Bulletin of the Financial University 11, no. 6 (January 28, 2022): 6–10. http://dx.doi.org/10.26794/2226-7867-2021-11-6-6-10.
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The article presents the author’s approach to modelling intergenerational communications based on the concept of social exchanges . The macro-level model describes different balances of exchanges of material and non-material resources between three generations and within one generation. Modelling allows us to provide an empirical analysis of quantitative data that form one of the possible outcomes: donation, recipient, parity. Based on micro-level and macrolevel models, the author proposed a set of projects in the field of youth policy for the integration of generations. Projects were classified according to areas of public life.
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Phaiboon, Supachai, and Pisit Phokharatkul. "Accurate Empirical Path Loss Models with Route Classification for mmWave Communications." International Journal of Antennas and Propagation 2022 (October 20, 2022): 1–9. http://dx.doi.org/10.1155/2022/2780029.
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This paper presents accurate empirical path loss models with route classification for the high band frequency of 5 G wireless. Propagation path routes are mainly classified into line of sight (LOS) and non-line-of-sight (NLOS). The NLOS routes are classified into 2 separate routes, namely, Hard_NLOS and Soft_NLOS. Their path loss models include free-space loss (Lfs) and multiscreen diffraction loss (Lmsd) together with the reflection from the building blocks. However, these NLOS routes can be combined into a single formula. The path loss models were fitted with measured path loss data at frequencies of 28 GHz and 73 GHz. These models are compared with four 5G empirical models, namely 5GCM, 3GPP, METIS, and mmMAGIC. The results show that the separated route models provide good agreement, especially for the hard routes compared with those models and provide the minimum MAE of 4.45 dB, 4.34 dB, and 6.72 dB for the hard route, soft route, and an all-NLOS route, respectively, for the dual-band frequency.
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Pérez Tadeo, María, Martin Gammell, and Joanne O'Brien. "First Steps towards the Automated Detection of Underwater Vocalisations of Grey Seals (Halichoerus grypus) in the Blasket Islands, Southwest Ireland." Journal of Marine Science and Engineering 11, no. 2 (February 4, 2023): 351. http://dx.doi.org/10.3390/jmse11020351.
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Underwater vocalisations of grey seals (Halichoerus grypus) were recorded by static acoustic monitoring (SM2M, Wildlife Acoustics) in the vicinity of a colony located at White Strand beach on Great Blasket Island, southwest Ireland during the pre-breeding and breeding seasons. Grey seal vocalisations were first classified across nine different categories based on aural and visual characteristics of the spectrograms, providing an acoustic repertoire for grey seals. This classification was further investigated by applying a classification tree analysis, resulting in five of the initial nine groups being selected. Furthermore, a comparison of two common approaches for the detection and extraction of vocalisations from acoustic files was done using the software Raven Pro and PAMGuard. The outputs of this study will present an essential first step towards the development of a protocol for underwater acoustic monitoring of grey seals in Irish waters and elsewhere.
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Noor-ul-huda, Muhammad, Samabia Tehsin, Sairam Ahmed, Fuad A. K. Niazi, and Zeerish Murtaza. "Retinal images benchmark for the detection of diabetic retinopathy and clinically significant macular edema (CSME)." Biomedical Engineering / Biomedizinische Technik 64, no. 3 (May 27, 2019): 297–307. http://dx.doi.org/10.1515/bmt-2018-0098.
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Abstract Diabetes mellitus is an enduring disease related with significant morbidity and mortality. The main pathogenesis behind this disease is its numerous micro- and macrovascular complications. In developing countries, diabetic retinopathy (DR) is one of the major sources of vision impairment in working age population. DR has been classified into two categories: proliferative diabetic retinopathy (PDR) and non-proliferative diabetic retinopathy (NPDR). NPDR is further classified into mild, moderate and severe, while PDR is further classified into early PDR, high risk PDR and advanced diabetic eye disease. DR is a disease caused due to high blood glucose levels which result in vision loss or permanent blindness. High-level advancements in the field of bio-medical image processing have speeded up the automated process of disease diagnoses and analysis. Much research has been conducted and computerized systems have been designed to detect and analyze retinal diseases through image processing. Similarly, a number of algorithms have been designed to detect and grade DR by analyzing different symptoms including microaneurysms, soft exudates, hard exudates, cotton wool spots, fibrotic bands, neovascularization on disc (NVD), neovascularization elsewhere (NVE), hemorrhages and tractional bands. The visual examination of the retina is a vital test to diagnose DR-related complications. However, all the DR computer-aided diagnostic systems require a standard dataset for the estimation of their efficiency, performance and accuracy. This research presents a benchmark for the evaluation of computer-based DR diagnostic systems. The existing DR benchmarks are small in size and do not cover all the DR stages and categories. The dataset contains 1445 high-quality fundus photographs of retinal images, acquired over 2 years from the records of the patients who presented to the Department of Ophthalmology, Holy Family Hospital, Rawalpindi. This benchmark provides an evaluation platform for medical image analysis researchers. Furthermore, it provides evaluation data for all the stages of DR.
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Salhi, M. A., T. Kleine-Ostmann, and T. Schrader. "Propagation Channel Measurements in the mm- and Sub-mm Wave Range for Different Indoor Communication Scenarios." Journal of Infrared, Millimeter, and Terahertz Waves 42, no. 4 (March 24, 2021): 357–70. http://dx.doi.org/10.1007/s10762-021-00785-8.
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AbstractIncreasing data rates in wireless communications are accompanied with the need for new unoccupied and unregulated bandwidth in the electromagnetic spectrum. Higher carrier frequencies in the lower THz frequency range might offer the solution for future indoor wireless communication systems with data rates of 100 Gbit/s and beyond that cannot be located elsewhere. In this review, we discuss propagation channel measurements in an extremely broad frequency range from 50 to 325 GHz in selected indoor communication scenarios including kiosk downloading, office room communication, living rooms, and typical industrial environments.
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Neuts, Marcel F. "An explicit solution to a particular Markov chain of M/G/1 type." Journal of Applied Probability 31, A (1994): 337–42. http://dx.doi.org/10.2307/3214966.
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A Markov chain of M/G/1 type, which arose in a problem of communications engineering, is analyzed by a combination of matrix analysis and appropriate series expansions. The highly explicit results obtainable for this model owe much to analytic methods introduced by Professor Takács. Special features of the numerical implementation of the proposed solution are also discussed. The simplifications proper to this model can also be used in some related, more complex models to be discussed elsewhere.
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Neuts, Marcel F. "An explicit solution to a particular Markov chain of M/G/1 type." Journal of Applied Probability 31, A (1994): 337–42. http://dx.doi.org/10.1017/s0021900200107168.
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A Markov chain of M/G/1 type, which arose in a problem of communications engineering, is analyzed by a combination of matrix analysis and appropriate series expansions. The highly explicit results obtainable for this model owe much to analytic methods introduced by Professor Takács. Special features of the numerical implementation of the proposed solution are also discussed. The simplifications proper to this model can also be used in some related, more complex models to be discussed elsewhere.
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Bisio, G. "Exergy Analysis of Thermal Energy Storage With Specific Remarks on the Variation of the Environmental Temperature." Journal of Solar Energy Engineering 118, no. 2 (May 1, 1996): 81–88. http://dx.doi.org/10.1115/1.2848020.
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Energy storage is a key technology for many purposes and in particular for air conditioning plants and a successful exploitation of solar energy. Thermal storage devices are usually classified as either variable temperature (“sensible heat”) or constant temperature (“latent heat”) devices. For both models a basic question is to determine the efficiency suitably: Only exergy efficiency appears a proper way. The aim of this paper is to examine exergy efficiency in both variable and constant temperature systems. From a general statement of exergy efficiency by the present author, two types of actual definitions are proposed, depending on the fact that the exergy of the fluid leaving the thermal storage during the charge phase can be either totally lost or utilized elsewhere. In addition, specific remarks are made about the exergy of a system in a periodically varying temperature environment.
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Farid, A. M., and D. C. McFarlane. "Production degrees of freedom as manufacturing system reconfiguration potential measures." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 222, no. 10 (October 1, 2008): 1301–14. http://dx.doi.org/10.1243/09544054jem1056.
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In recent years, many design approaches have been developed for automated manufacturing systems in the fields of reconfigurable manufacturing systems (RMSs), holonic manufacturing systems (HMSs), and multi-agent systems (MASs). One of the principle reasons for these developments has been to enhance the reconfigurability of a manufacturing system, allowing it to adapt readily to changes over time. However, to date, reconfigurability assessment has been limited. Hence, the efficacy of these design approaches remains inconclusive. This paper is the first of two in this issue to address reconfigurability measurement. Specifically, it seeks to address ‘reconfiguration potential’ by analogy. Mechanical degrees of freedom have been used in the field of mechanics as a means of determining the independent directions of motion of a mechanical system. By analogy, manufacturing degrees of freedom can be used to determine independent ways of production. Furthermore, manufacturing degrees of freedom can be classified into their production and product varieties. This paper specifically focuses on the former to measure the product-independent aspects of manufacturing system ‘reconfiguration potential’. This approach will be added to complementary work on the measurement of ‘reconfiguration ease’ so as to form an integrated reconfigurability measurement process described elsewhere [1—5].
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Matthews, Peter C. "Pathological Habit Disorder?" Canadian Journal of Psychiatry 33, no. 9 (December 1988): 826–29. http://dx.doi.org/10.1177/070674378803300908.
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This paper outlines a diagnostic entity called ‘Pathological Habit Disorder’ which is suggested for inclusion in the DSM as an Axis II option. Specific areas of concern, either mental (Axis I) or physical (Axis III), would delineate the syndrome. Pathological Habit Disorder (PHD) points to treatment options where the syndrome is wholly or partly habit-driven. Whether the syndrome is habit-driven or not will remain a clinical judgement even though many conditions, previously thought immutable except by medication, are proving accessible to behavioural engineering. In the ICD system, PHD seems to fit in “Special Symptoms or Syndromes not elsewhere Classified”. It is demonstrably useful to have a diagnosis such as PHD and to incorporate it into the body of medical classification, recognizing current practices for dealing with unwelcome or damaging habits.
Dissertations / Theses on the topic "Communications engineering not elsewhere classified"
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Song, Dong Hyun. "Power struggles in Korean cyberspace and Korean cyber asylum seekers." Thesis, Goldsmiths College (University of London), 2012. http://research.gold.ac.uk/8052/.
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This thesis examines the potential power of internet users to use the internet in the conduct of their everyday lives by discussing the impact of state and non-state actors on cyberspace. The debate about ‘who controls the internet?’ has avoided the question of the power of internet users, which is needed to understand the character of cyberspace. Theoretical debates identify the overwhelmingly territorial nature of cyber governance through nationally developed and enforced legislation, which is in direct opposition to the power of transnational ICTs. This thesis contributes to this theoretical debate through the use of the concepts of alternative and radical media, which are usually categorised as anti-establishment resistance strategies. I use Michel de Certeau’s notion of the heterological practice of everyday life to develop a perspective on the power of the powerless on the internet. I also adopt Franklin’s theoretical stance on the relations between state, non-state, and social actors, which is influenced by de Certeau’s ideas about the plurality of space. In order to illustrate this argument, I discuss the Korean ‘cyber asylum seeker’ phenomenon, which arose when Korean internet users migrated from local web portals to global corporations, such as Google and YouTube, who had refused to comply with the restrictions that the Korean government policies imposed on the local internet. This development allowed Korea cyber asylum seekers to become power holders, thus expanding the reach of Korean cyberspace. The Korean cyber asylum phenomenon was a result of both the Korean government’s cyber intervention following the 2008 Candlelight protest and Korean web portals’ compliance. I therefore understand the Korean cyber asylum seeker phenomenon from the perspective of a tripartite inter-relationship between the Korean government, the web portals, and internet users. This tripartite approach sheds new light on current debates about the questions: ‘Who controls the internet’, ‘Why is it controlled?’ and ‘How is it controlled?’ by adding the question, ‘What other groups have had an impact on power formations in cyberspace?’ My field research points to the significance of internet user mobility for a more complete understanding of the effect of the Korean government and the web portals on the expansion of Korean cyberspace. The research project is based on an analysis of the Korean government’s internet policy, business reports of Korean web portals, and interviews with officials from government bodies, the Korean internet industry, activists, citizens and online community members, as well as online community observation.
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Mahmod, Jowan. "Reconfiguring diaspora : Kurds online." Thesis, Goldsmiths College (University of London), 2012. http://research.gold.ac.uk/8010/.
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This research examines diasporic transformations and the construction of belongings through new technologies of communication by looking at young Kurdish diasporas in Sweden and the UK. It argues that the diaspora concept needs to be reconceptualised in light of digital information and communication technologies and in relation to the imagined community. Empirical evidence from Kurdish diasporas has drawn attention to some missing gaps in the literature. The research asks what it means to be a Kurd in diaspora and what role new media and online communities have in the renegotiation and construction of belongings. By engaging with post-colonial and feminist studies, I unpick fixed categories of identity, belongings and home, and I argue for performativities of those belongings. Based on a year-long ethnographic online study supplemented by offline face-to-face interviews with young Kurds in these locations, and with additional reference to homeland- based Kurds, the research presents three main empirical chapters based on themes derived from the online community’s concerns, and focuses on Swedish, British, and Kurdish forums. The chapters discuss gender and religious tensions; cultural elements and historical suffering; and political engagements in homeland and settlement countries. A fourth chapter takes a step back from online and offline material and examines the comparative approach between the two diasporas, diasporic and homeland Kurds, in both offline and online environments. Against the background of such a close-up comparative study, this research argues for a reconsideration of diasporic formations that are currently fixed between homeland and settlement country, and it presents new perspectives on these that relates to new definitional positions in diasporic formations that have significant implications for the concept of the imagined community.
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Schlosberg, Justin. "Power in the dock : media and accountability in the digital age." Thesis, Goldsmiths College (University of London), 2012. http://research.gold.ac.uk/8029/.
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Contemporary democratic discourse places emphasis on accountability as the basis of power legitimacy and the scholarly literature across disciplines has reserved a special space for the media in that process, for better or for worse. But exactly who is held to account, when, how and by whom, remain troubling questions in the study of media, politics and power. Amidst displays of adversarial journalism without fear or favour, how far are powerful interests still able to control the agenda and manipulate outcomes? The research undertaken here set out to interrogate the notion of media spectacle in a different way from which it has been commonly applied in critical media theory. In particular, its intimate association with sensationalism and tabloidisation threatens to obscure the role of spectacle in what are considered the mainstays of ‘serious’ or responsible news. The Sun might still be the most popular newspaper in Britain, and online news the fastest growing platform, but it is the serious news outlets of traditional media – public service broadcasting, broadsheets, weeklies etc – which remain by far the most credible sources of news and information. And it is credibility which holds the key to ideological power. The research involved extensive analysis of archived television news programmes, supplemented by 50 interviews with a cross section of news producers and actors including journalists, news executives, politicians, campaigners, press officers, lawyers and civil servants. The core subject is terrestrial television news in the UK – a public service regulated platform with a longstanding reputation for high quality journalism. My overall concern is not so much with scandal involving official misconduct or misdemeanour, but rather controversies that point to systemic institutional corruption of the kind that transcends individuals and party politics. These controversies are no longer rare exceptions in the contemporary newscape and their existence raises profound questions about the scope of accountability through the media. There has, however, been surprisingly little critical assessment of such coverage. This provided the overarching motivation for the research; a core premise being that only by examining those instances where mechanisms of accountability appear most far reaching, can we gain a new understanding of ideological power in the age of transparency.
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Kolbl, Josef Karl. "Low-noise frequency synthesis and picosecond timing for satellite laser ranging systems." Thesis, University of Central Lancashire, 2001. http://clok.uclan.ac.uk/20201/.
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The main aims of the research are to develop various high-speed hardware circuits based on the latest electronic devices and integrated circuit technologies to provide time measurement with one picosecond accuracy, thereby enabling the development of a satellite laser ranging (SLR) system with submillimeter precision. Different types of oscillators and frequency multipliers have been developed (RF and microwave) in order to provide a synchronous and low phase noise clock signal to the SLR timing system, which is phase-locked to the Universal Time Clock (UTC). A technique to quantify phase noise in signal sources is presented and verified. The development of the ranging system encompasses the analog timing verniers, the digital timing system, acquisition and processing of the ranging data, and the controlling of the peripherals, like the laser. The mixed analog/digital timing system architecture provides a time interval determination of two events with picosecond accuracy. Optical calibration techniques and an electronic timing calibration technique were developed to provide calibration of the timing system down to one picosecond accuracy and femtoseconds of resolution, traceable to the International Standard (speed of light, metric standard). The work done has led to several electronic modules for measuring precisely laser runtimes to artificial satellites and to the Moon which are now in successful and permanent operation in five SLR stations around Tokyo, one SLR station in Australia, and one SLR station in Germany. Furthermore, the work has produced three papers and two patents and won the First Prize of Innovation Awards from Deggendorf Government. The research and development work pushed the picosecond timing technology to an extent where the SLR stations in Australia, Tokyo and Germany now have a significant improvement in their ranging data accuracy in comparison to their previous timing equipment, thereby achieving more precise environmental monitoring.
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Macwhannell, Robert. "An investigation of Organisational Carbon Accounting (OCA) practices in the defence sector to determine how these can best support low carbon technology innovation." Thesis, University of Central Lancashire, 2018. http://clok.uclan.ac.uk/23077/.
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‘Climate change’ and ‘defence’ are becoming closely associated topics, particularly in relation to the potential that the defence sector has to support the development of low carbon technologies. This exploratory research applies an inductive approach and a strongly archival strategy in order to investigate how Organisational Carbon Accounting (OCA) practices in the defence sector can best support low carbon technology innovation. It takes an interdisciplinary approach to the literature, drawing on the fields of Carbon Accounting, Defence Industrial Policy, and Innovation Studies. It finds that there some difficulties allocating emissions to organisations in existing OCAs, which are particularly marked in the defence sector due to close working relationships between organisations. These allocations can result in abstract OCAs that do not always reflect the underlying activities causing emissions to be produced. In contrast, ‘Project Level’ Carbon Accounts focused on large-scale collaborative programmes can better account for the emissions of the defence sector in an understandable way that engages new and relevant actors to defence-energy debates. These accounts are therefore more likely than existing OCA practices to support low carbon technology development across innovation networks. A positive selection environment for low carbon technologies can be promoted if these ‘Project-Level’ Carbon Accounts are presented within an appropriate strategic framework, and this research describes the relevance of the defence sector concepts of ‘resilience’ and ‘endurance’ and the related metric of the Fully Burdened Cost of Energy (FBCE). The findings emphasise the value of sector-level analyses of OCA practices, which are not represented in the literature at present. The sector-level perspective can help identify relevant methods from the wider Carbon Accounting field that can improve existing organisational approaches. More importantly, it can help researchers engage with the fundamental question of what Carbon Accounting is for, by analysing how the OCA practices within a specific sector support or inhibit its most effective contribution to climate change mitigation.
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Thakore, Renuka. "A strategic engagement model for delivering energy efficiency initiatives in the English housing sector." Thesis, University of Central Lancashire, 2016. http://clok.uclan.ac.uk/18647/.
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Housing sectors have particular significance and impact on resource use, deployment and sustainability. Given this, they are inextricably enmeshed in a raft of conjoined issues, ranging from energy, production and consumption, through to effective governance structures and leveraged sustainable transformations. However, the real challenges facing the Housing sectors rest with the supportive societal structures which underpin the operationalisation of these issues. This includes such factors as consultation and engagement, and the identification of critical drivers and proven solutions – which are tangible barriers for sustainable transformations (particularly in the English housing system). This research presents a conceptual model – STRIDES (Strategic Tri-level Relational Interventions for Delivering Energy efficiency and Sustainability), which purposefully addresses the aforementioned barriers, and critically challenges thinking and engagement. STRIDES explicitly captures 5-INs, which embodies interrelated essential conditions needed for successful transformation. This conceptual model was developed using a mixed-method approach, engaging constructivism/interpretivism to guide the development and augmentation of this (to ensure maximum relevance and impact). The English housing system was used as the primary lens – which helped both shape and inform the research methodological approach. STRIDES was developed through: an online survey questionnaire (for systems-knowledge); Delphi questionnaires (for target-knowledge); and focus group discussions (for transformative-knowledge). The theoretical constructs and methods revealed exclusive hidden dialogue of composite correlated multi-perspective stakeholders, which highlighted tri-level influences on interdependent system-components for effective governance of sustainable transformations. Recognising and prioritising relationally responsive emerging strategies arising from STRIDES help stakeholders appreciate subtle nuances and forces across and beyond contexts. This helps positioning, especially to shape/tailor strategic interventions to deliver meaningful objectives of these sustainable transformations.
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Burchell, Kenzie. "Negotiating connection without convention : the management of presence, time and networked technology in everyday life." Thesis, Goldsmiths College (University of London), 2012. http://research.gold.ac.uk/7995/.
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This thesis explores the social processes through which technological change and technologies themselves are negotiated in everyday life. I look to interpersonal communication as a site of such negotiation and focus on the networked practices that extend from mobile telephones, personal computers, and online social platforms. The management of everyday life and interpersonal relationships are shaped by practices of communication management that work through the use of these technologies. I extend and inflect the phenomenological approach to co-presence in interpersonal communication, also reassessing notions of time, for the context of constant networked connection. Drawing from divergent theoretical approaches for understanding technology, an entry point for this thesis was formulated through social interaction. A grounded qualitative approach was used to engage with individuals’ experience of interpersonal communication across everyday domains and contexts of activity. A selection of 35 participants was asked to complete two in-depth interviews, thinking-aloud tasks, and a communication diary. The empirical findings are explored from three perspectives. First, individuals’ relationships to communication tools as objects in an everyday environment are understood for the perceived temporal pressures and a need for networked connection. Second, individuals’ management of those pressures is explored through their imposition of individually controlled barriers to interaction, through which domains of activity are managed by communication practices as relational domains, developing a form of networked awareness between individuals. Third, I examine the forms of negotiation taking place through the interdependency of individual practices, captured by notions of authenticity and perceptions of technologies, as well as a discourse about technology that is enacted through practice rather than communicated through content, what I call meta-communication. I conclude that the negotiated use and role of technologies in interpersonal relationships has implications for the negotiation of wider social changes to the role of technology and to everyday life itself.
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(8709819), Matthew Benjamin Booth. "Multiple Antenna Signal Processing Techniques for Millimeter Wave Communications." Thesis, 2020.
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Mobile devices operating at millimeter-wave (mmWave) frequencies are expected to comprise an integral part of fifth generation (5G) communication systems to meet increasing data rate demands. Massive multiple-input multiple-output (MIMO) and advanced signal processing techniques are required to overcome the harsh propagation environment in this spectrum. We focus on two aspects of MIMO communication systems.
First, the large number of antennas creates a challenge in aligning and tracking highly directional, narrow beams. Algorithms which rapidly adapt to the changing mobile environment are required. We propose a novel beam alignment and tracking algorithm for time-varying, sparse mmWave channels using multi-armed bandit beam selection. We show our algorithm has a more rapid initial beam alignment compared to other beam selection policies and, for dynamic channel support, long-term beamforming gain commensurate to omni-directional channel training. Simulation results are accomplished using idealized and realistic mmWave channel models.
Second, massive MIMO systems can generate potentially prohibitive amounts of data due to the large numbers of antennas. With modern parallel, low-rate analog-to-digital converters (ADCs), the bottleneck is often not in the quantization of the received signals but, rather, in the processing of the digitized bits. Therefore, we develop an adaptive algorithm for down-selecting the digital output data to meet some required output data rate threshold while simultaneously maximizing the information between the transmitted signal and the selected output.
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(9798128), David Gay. "Investigation of the applicability of power line communications for smart SWER." Thesis, 2013. https://figshare.com/articles/thesis/Investigation_of_the_applicability_of_power_line_communications_for_smart_SWER/13465160.
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"As demand for power increases in rural areas serviced by Single Wire Earth Return (SWER) networks, distribution issues are becoming increasingly evident. Voltage regulation and system capacity concerns are driving utilities toward using smarter compensation devices for network control in an attempt to provide longevity for aging SWER infrastructure. To date, despite increasing complexity in power delivery over SWER, no effective network monitoring solutions have been proposed.This paper examines the case for network monitoring and centralised management of smart compensation devices via PowerLine Communications (PLC). After establishing advantages in network monitoring, regulation and maintenance for SWER networks, narrowband and broadband PLC issues are reviewed. The channel capacity of typical SWER conductors is then evaluated and compared to data throughput requirements derived from existing infrastructure to validate the applicability of developing PLC over SWER infrastructureIn building a more efficient, smarter network, a degree of device autonomy will be eroded to facilitate a more holistically managed system. This can only be accomplished through communication between smart devices themselves and reporting to utilities, which in turn will require a communications medium. This thesis looks at the possibility of using the power distribution system as the communication medium."--Abstract.
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(8083247), Yong Hoon Kim. "INTEGRATED MODELING FRAMEWORK FOR DYNAMIC INFORMATION FLOW AND TRAFFIC FLOW UNDER VEHICLE-TO-VEHICLE COMMUNICATIONS: THEORETICAL ANALYSIS AND APPLICATION." Thesis, 2019.
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Advances in information and communication technologies enable new paradigms for connectivity involving vehicles, infrastructure, and the broader road transportation system environment. Vehicle-to-vehicle (V2V) communications under the aegis of the connected vehicle are being leveraged for novel applications related to traffic safety, management, and control, which lead to a V2V-based traffic system. Within the framework of a V2V-based traffic system, this study proposes an integrated modeling framework to model the dynamics of a V2V-based traffic system that entails spatiotemporal interdependencies among the traffic flow dynamics, V2V communication constraints, the dynamics of information flow propagation, and V2V-based application. The proposed framework systematically exploits their spatiotemporal interdependencies by theoretical and computational approaches.
First, a graph-based multi-layer framework is proposed to model the V2V-based advanced traveler information system (ATIS) as a complex system which is comprised of coupled network layers. This framework addresses the dynamics of each physical vehicular traffic flow, inter-vehicle communication, and information flow propagation components within a layer, while capturing their interactions among layers. This enables the capabilities to transparently understand the spatiotemporal evolution of information flow propagation through a graph structure. A novel contribution is the systematic modeling of an evolving information flow network that is characterized as the manifestation of spatiotemporal events in the other two networks to enhance the understanding of the information flow evolution by capturing the dynamics of the interactions involving the traffic flow and the inter-vehicle communication layers. The graph-based approach enables the computationally efficient tracking of information propagation using a simple graph-based search algorithm and the computationally efficient storage of information through a single graph database.
Second, this dissertation proposes analytical approaches that enable theoretical investigation into the qualitative properties of information flow propagation speed. The proposed analytical models, motivated from spatiotemporal epidemiology, introduce the concept of an information flow propagation wave (IFPW) to facilitate the analysis of the information propagation characteristics and impacts of traffic dynamics at a macroscopic level. The first model consists of a system of difference equations in the discrete-space and discrete-time domains where an information dissemination is described in the upper layer and a vehicular traffic flow is modeled in the lower layer. This study further proposes a continuous-space and continuous-time analytical model that can provide a closed-form solution for the IFPW speed to establish an analytical relationship between the IFPW speed and the underlying traffic flow dynamics. It can corporate the effects of congested traffic, such as the backward traffic propagation wave, on information flow propagation. Thereby, it illustrates the linkage between information flow propagation and the underlying traffic dynamics. Further, it captures V2V communication constraints in a realistic manner using a probabilistic communication kernel (which captures the probability).
Third, within the integrated modeling framework, this dissertation captures the impact of information flow propagation on traffic safety and control applications. The proposed multi-anticipative forward collision warning system predicts the driver’s maneuver intention using a coupled hidden Markov model, which is one of statistical machine learning techniques. It significantly reduces the false alarm rates by addressing the uncertainty associate improves the performance of the future motion prediction, while currently available sensor-based kinematic models for addressing the uncertainty associated with the future motion prediction. A network-level simulation framework is developed to investigate a V2V-based ATIS in a large-scale network by capturing its inter-dependencies and feedback loop. This modeling framework provides the understanding of the relationship between the travelers’ routing decisions and information flow propagation.
This thesis provides a holistic understanding of information flow propagation characteristics in space and time by characterizing interactions among information flow propagation, and underlying traffic flow, and V2V communications characteristics. The proposed models and the closed-form solution of IFPW speed can help in designing effective V2V-based traffic systems, without relying on computationally expensive numerical methods. An innovative aspect of this approach represents a building block to develop both descriptive capabilities and prescriptive strategies related to propagating the flow of useful information efficiently and synergistically generating routing mechanisms that enhance the traffic network performance. Given the lack of appropriate methodologies to characterize the information flow propagation, this thesis expects to make a novel and significant contribution to understanding the characteristics of V2V-based traffic systems and their analysis.
Book chapters on the topic "Communications engineering not elsewhere classified"
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Ahmadu, Bello, Ab Razak Che Hussin, and Mahadi Bahari. "Development and Validation of a Classified Information Assurance Scale for Institutions of Higher Learning." In Lecture Notes on Data Engineering and Communications Technologies, 857–68. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70713-2_77.
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Galpin, Vashti. "Women in Technology in Sub-Saharan Africa." In Global Information Technologies, 1681–88. IGI Global, 2008. http://dx.doi.org/10.4018/978-1-59904-939-7.ch122.
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International research has shown that in most countries, there are few women studying towards information technology (IT) careers (Galpin, 2002), and there is much research, particularly in the United States (U.S.), United Kingdom (UK) and Australia into why this is the case (Gürer & Camp, 2002). This article considers the situation in sub-Saharan Africa and focuses on women’s involvement in the generation and creation of information and communication technologies (ICTs) in sub-Saharan Africa, as opposed to ICT use in sub-Saharan Africa, which is considered elsewhere in this volume. There are a number of aspects to the generation and creation of ICTs: how women are involved in this process as IT professionals and how they are educated for these careers, as well how technology can be used appropriately within the specific conditions of sub-Saharan Africa. ICTs will be considered in the broadest sense of the word, covering all electronic technologies, from computers and networking to radio and television. Women’s participation is important: The World Summit on the Information Society (WSIS) Gender Caucus (www.genderwsis.org) has identified women’s involvement in the design and development of technology as well as technology management policy, as key principles for the information society. Marcelle (2001) emphasizes the necessity for African women to become involved in technological and scientific areas, including “computer science, software engineering, network design, network management and related disciplines” (Marcelle, 2001, para. 15) to create an information society appropriate for African women. The diversity of those involved in design leads to higher-quality and more appropriate technological solutions (Borg, 2002; Lazowska, 2002). Background Sub-Saharan Africa has a population of 641 million, young (almost half under 15) and rural (35% urban). Significant problems are undernourishment, poverty and HIV/AIDS (United Nations Development Programme (UNDP), 2004). All the countries in sub-Saharan Africa are classified as developing countries. Some countries are relatively wealthy, such as Mauritius, South Africa, and Nigeria, but have large wealth disparities within their populations. Women in sub-Saharan Africa are expected to focus on the home, they have less access to education and health, and their contribution to family and community is not valued (Huyer, 1997).
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Wakabayashi, Ryoji. "Practice of Meteor Burst Communication." In Advances in Environmental Engineering and Green Technologies, 213–28. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-2381-0.ch012.
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A lot of research and experiments on meteor burst communication described in the previous chapter have been done by research institutions, educational institutions, and amateur radio operators. The contents of research and experiments are roughly classified into two categories. One is to investigate the frequency and duration of meteor bursts themselves, and the other is to study data transmission using meteor bursts. This chapter introduces some experiments on meteor burst communications conducted in Japan and the method of QSO by meteor scatter communications conducted by amateur radio operators.
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Vasantha, Gokula, David Purves, Jonathan Corney, Michael Canavan, John Quigley, and Andrew Sherlock. "Towards Predictive Design: Tracking a CNC Fixture Design Process to Identify the Requirements." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220589.
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Training novice production engineers to design manufacturing fixtures is a time-consuming process involving significant input from experienced experts. Motivated by the vision of providing an intelligent support system for general mechanical design, this paper develops a list of requirements for predictive suggestion mechanisms focused on creating fixtures for holding components during machining. To do this, the email communications between nine novices and one expert during the design of machining fixtures were studied. The analysis classified the expert’s feedback into ten coded themes. The significance of these themes was assessed by quantifying the resulting changes in the CAD models of the fixtures designs and fixture requirements. The identified results lay the foundation for developing a comprehensive CAD predictive suggestion system to support fixture design. Novice designers will benefit from this predictive suggestion system by correcting their design errors in real-time and reducing the need for experts’ time in the training process.
Conference papers on the topic "Communications engineering not elsewhere classified"
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Shibutani, Tadahiro, Tetsu Tsuruga, Qiang Yu, and Masaki Shiratori. "Interface Strength Between Sub-Micron Thin Films in Opening and Sliding Delamination Modes." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39631.
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Delamination between thin films is classified into two types: opening mode and sliding mode. Corresponding to each mode, there is the interface strength between thin films. This paper aims to evaluate interface strength between the sub-micron thin films for opening mode and sliding mode, respectively. We already developed the evaluation method of interface fracture toughness for opening mode on the basis of fracture mechanics concept elsewhere. Moreover, the evaluation method of sliding mode is proposed and the interface strength between thin films for an advanced LSI is evaluated as the fracture toughness by using both methods. In both modes, the stress singularity appears in the vicinity of the edge of interface and governs the delamination. The criterion of crack initiation for each mode is evaluated as the interface toughness. The fracture toughness at the edge of interface in sliding mode is lower than that in opening mode.
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Marchenko, Nataliya. "Navigation in the Russian Arctic: Sea Ice Caused Difficulties and Accidents." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10546.
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The 5 Russian Arctic Seas have common features, but differ significantly from each other in the sea ice regime and navigation specifics. Navigation in the Arctic is a big challenge, especially during the winter season. However, it is necessary, due to limited natural resources elsewhere on Earth that may be easier for exploitation. Therefore sea ice is an important issue for future development. We foresee that the Arctic may become ice free in summer as a result of global warming and even light yachts will be able to pass through the Eastern Passage. There have been several such examples in the last years. But sea ice is an inherent feature of Arctic Seas in winter, it is permanently immanent for the Central Arctic Basin. That is why it is important to get appropriate knowledge about sea ice properties and operations in ice conditions. Four seas, the Kara, Laptev, East Siberian, and Chukchi have been examined in the book “Russian Arctic Seas. Navigation Condition and Accidents”, Marchenko, 2012 [1]. The book is devoted to the eastern sector of the Arctic, with a description of the seas and accidents caused by heavy ice conditions. The traditional physical-geographical characteristics, information about the navigation conditions and the main sea routes and reports on accidents that occurred in the 20th century have reviewed. An additional investigation has been performed for more recent accidents and for the Barents Sea. Considerable attention has been paid to problems associated with sea ice caused by the present development of the Arctic. Sea ice can significantly affect shipping, drilling, and the construction and operation of platforms and handling terminals. Sea ice is present in the main part of the east Arctic Sea most of the year. The Barents Sea, which is strongly influenced and warmed by the North Atlantic Current, has a natural environment that is dramatically different from those of the other Arctic seas. The main difficulties with the Barents Sea are produced by icing and storms and in the north icebergs. The ice jet is the most dangerous phenomenon in the main straits along the Northern Sea Route and in Chukchi Seas. The accidents in the Arctic Sea have been classified, described and connected with weather and ice conditions. Behaviour of the crew is taken into consideration. The following types of the ice-induced accidents are distinguished: forced drift, forced overwintering, shipwreck, and serious damage to the hull in which the crew, sometimes with the help of other crews, could still save the ship. The main reasons for shipwrecks and damages are hits of ice floes (often in rather calm ice conditions), ice nipping (compression) and drift. Such investigation is important for safety in the Arctic.
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Gregory, M. J., and I. S. Fan. "Possible Sources of Sub-Optimisation in Design for Manufacture: An Initial Survey." In ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/dfm-21205.
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Abstract This paper surveys the human and technical problems that may occur in manufacturing and how they may be prevented in design. Advice and guidance on Design for Manufacture was sought from textbooks, journal articles and conference papers that aim to improve the process or report on difficulties. Potential problems are classified and related to the sources of knowledge available to prevent these problems reaching the shop floor. The detail analysis is presented in this paper. This structured approach could assist in planning CE processes, especially communications and teamworking, so that potential problems are addressed in a comprehensive manner so as to minimise the costs, effort and delay needed to avoid them.
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Nelson, Raymond, Peter Sandborn, Janis P. Terpenny, and Liyu Zheng. "Modeling Constraints in Design Refresh Planning." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47644.
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When an original equipment manufacturer no longer supplies and/or supports a product then the product is considered to be obsolete. Obsolescence is a significant problem for systems whose operational and support life is much longer than the procurement lifetimes of their constituent components. Unlike high-volume, commercial products, which are quickly evolved, long field life, low-volume systems, such as aircraft may require updates of their components and technology called design refreshes to simply remain manufacturable and supportable. However these systems can’t perform design refreshes all the time due to the high nonrecurring and re-qualification costs. One approach to optimally managing this problem is to use DRP (Design Refresh Planning), which is a strategic method for scheduling design refreshes such that the life cycle cost impact of obsolescence is minimized. The planning of these design refreshes is restricted by various constraints, which need to be implemented into the DRP process. These constraints can reflect technology roadmap requirements, obsolescence management realities, logistical restrictions, budget ceilings and management policy. In this paper, constraints imposed on the DRP process are explored, classified within a taxonomy, and implemented in the planning process. A communications system design example is included.
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Gibbs, Hyatt M. "Central role of thin films in nonlinear optical signal processing." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/oam.1985.thn2.
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Nonlinear optical devices may change completely the character of optical signal processing and computing systems by making logic decisions and switching beam directions. This may better utilize the ability of optics to make high-speed massively parallel transformations by preprocessing the results and reducing the amount of data fed back to an electronic system. Such nonlinear devices can be classified as nonlinear waveguides and nonlinear etalons (interference filter and Fabry-Perot). Both use thin films. Both require an intensity-dependent phase change, δϕ= (2π/λ)δ(nL), of 0.1π to π, where δ (nL) is the change in optical path length. This makes the large nonlinearities of semiconductors highly attractive (δn of 10−4 to 1 cm2/kW for band-edge nonlinearities due to excitonic, band-filling, thermal, bound-exciton, etc. effects). Waveguide devices, which can use smaller nonlinearities because a high intensity is maintained over millimeter lengths, are especially applicable to optical communications and other serial processing situations. Micron-thick etalons are a natural for parallel processing of multiple beams and for imaging whole arrays of data at once. The success of thin-film nonlinear optical devices hinges not only on large nonlinear refraction but also on low background absorption and on uniformity sufficient for low-scatter guides and arrays of high-finesse etalons. Thin-film technology offers a variety of growth techniques and the opportunity for engineering desirable properties.