38 research outputs found
Design and Modeling of Decoupled and Tunable Bandwidth (40-330 Hz) MEMS Vibratory Gyroscopes
No full textThis thesis reports on the design and modeling of decoupled and tunable bandwidth MEMS vibratory gyroscopes that were designed for the medical applications of tremor compensation and micro-surgical tool navigation. Two different designs are presented. The first design is a dual mass de-coupled gyroscope that consists of a drive and sense mass implemented in a drive frame architecture. The device achieves a theoretical maximum resolution of 0.01 deg/s and a maximum sensitivity of 5.247 \u83F/deg/s. However, this design is prone to quadrature error that drastically reduces the sensitivity of the device and completely destroys its performance. The second design is a three-mass doubly-decoupled gyroscope that consists of a drive, Coriolis and sense mass and is designed to overcome the sensitivity of the dual mass de-coupled gyroscope to quadrature error. The three-frame structure of this gyroscope, with an outer sensing frame, leads to an improved electrical sensitivity over conventional architectures. It leads to a full decoupling between the sense and drive modes that makes the device robust against quadrature error and eliminates the cross axis sensitivity that usually limits the angular rate sensing performance. The device achieves a theoretical maximum resolution of 0.006 deg/s and a maximum sensitivity of 1.255 \u83F/deg/s. Optimizing this design based on the DVA principle leads to a 60 % reduction in the size of the Coriolis mass, resulting in a 37 % increase in the resolution and an 19 % increase in the sensitivity. The drive and sense mode resonance frequencies of the designs are 2500 Hz and 2830 Hz respectively, with an input angular rate bandwidth tunable between 40Hz and 330Hz. Both COMSOL finite element simulations and macro models implemented in Agilent ADS were used to validate the structures.Electronic InstrumentationMicroelectronicsElectrical Engineering, Mathematics and Computer Scienc
Design & Modeling of a MEMS Contact-mode Piezoresistive Detector for Pull-in Acceleration Sensing
No full textRecently a new kind of accelerometer was developed. The accelerometer uses the pull-in time to measure the accelerations. However most of the applied measurement techniques for this kind of accelerometers had shown some drawbacks in the working process. So in this dissertation a new measurement method is introduced based on piezoresistivity to overcome some of the issues. The new measurement method made use of the piezoresistive contact-mode detectors. In this project the detectors were investigated for the realization of pull-in time accelerometers. The working principle of this measurement technique was as follows, when pull-in occurs, the piezoresistive contact-mode detector senses the movement and a signal is created to signify the impact event. The contact method approach is introduced and explained in detail in the thesis along with simulated and experimental data from fabricated microdevices. The sensitivity of the fabricated detector was found to be 0.1mV/nm.Microelectronics & Computer EngineeringElectrical Engineering, Mathematics and Computer Scienc
405 A snapshot study of obesity, gender and puberty in a multi-ethnic paediatric population
No full textMEMS Integration Techniques on Silicon-On-Insulator for Inertial Devices
No full textMicroelectronicsElectrical Engineering, Mathematics and Computer Scienc
Analysis of the key issues in the provision of bulk electric grid services by distributed energy resource aggregations
No full textThe global concern for climate change and the goal for energy independence are major drivers of the deepening penetration of distributed energy resources (DERs) — which include renewable resources (RRs), demand response resources (DRRs), and energy storage resources (ESRs). However, the deepening penetration of RRs is often limited by the inability and unwillingness of bulk grid operators to expand their transmission grids. The intermittencies associated with RRs and the exacerbated flexibility requirements are some of the key challenges that hinder their deployment. The absence of a sufficient inventory of dispatchable resources such as DRRs and ESRs integrated into bulk electric grids further aggravates these concerns.
Therefore, there is a market shift to DERs integrated into the distribution grids for the provision of energy, capacity and ancillary services in bulk electric power systems. These resources are largely integrated into distribution grids and may participate in retail or utility programs; therefore, they represent an untapped potential at the bulk electric grid level. The entry of these resources as potential participants in the bulk electricity markets enhances the opportunities for clean energy utilization, broadens the scope of wholesale market competition and expands the range of customer options on their source of electricity. In order to harness their outputs for the provision of bulk electric grid services, the notion of resource aggregation serves as the primary modality by which small DERs may be harnessed as part of an aggregation to provide services that are palpable to the bulk system operator. Resource aggregation provides a platform for DERs to participate in whole- sale electricity markets, as in the case of DRRs and vehicle-to-grid (V2G) mechanisms. Such distributed control actions for DERs also help overcome the market barriers that previously hindered their participation. The effective utilization of DERs in bulk electricity markets also creates a good scope for their wide scale deployment, creates new revenue streams that defray the returns on their investments, helps transmission system operators comply with their operational objectives and defer additional capacity expansion investments.
Recognizing these benefits of harnessing DERs in bulk electric grid operations, the Federal Energy Regulatory Commission (FERC) took a major step forward when it approved the 2016 California Independent System Operator (CAISO) initiatives for its DER provider framework and ESR tariff revisions, which collectively remove barriers for DER participation, establish a framework for the provision of bulk electric grid services by DER aggregations (DERAs), and attempt to modify the treatment of ESRs in its wholesale markets. As an aftermath of these decisions, FERC also issued a notice of proposed rulemaking (NOPR) to extend these decisions to all the organized wholesale electricity markets in the U.S., as per individual market regulations. These exemplary moves are harbingers of future energy policy initiatives that redefine the role of DERs (particularly ESRs) and modify their treatment in electricity markets.
In this thesis, we present the development of a conceptual multi-layer framework for the simulation and analysis of issues that must be addressed to allow the smooth integration of DERAs into bulk electric grids and their associated wholesale electricity markets. We analyze the salient characteristics of the DERA paradigm and describe the various entities involved. The proposed framework may be implemented as a vehicle to quantify the impacts of the interactions between the various market players, and gain valuable insights to understand how DERs may be harnessed for the provision of services other than those that were originally intended. The DERA may be treated as an abstraction of the virtual power plant (VPP) concept. Under the DERA paradigm, distribution microgrids and community DER projects may participate in the provision of bulk grid services. We assess the role of a new market entity – the DERA operator (DERAO) – who serves as the market participant on behalf of the DERA and helps the transmission system operator maintain the supply-demand balance around the clock. We discuss the role of the DERAO in the DERA scheduling operations to provide bulk grid services and participate in the associated markets. We also investigate via case studies the key opportunities and challenges for DERA participation in wholesale electricity markets that may be of interest in energy policy and in the evolution of new business models for DER aggregation strategies.Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2019-05-01The student, Rajaraman Padmanabhan, accepted the attached license on 2017-04-18 at 12:50.The student, Rajaraman Padmanabhan, submitted this Thesis for approval on 2017-04-18 at 12:51.This Thesis was approved for publication on 2017-04-24 at 10:06.DSpace SAF Submission Ingestion Package generated from Vireo submission #10856 on 2017-08-10 at 15:06:04Made available in DSpace on 2017-08-10T20:33:05Z (GMT). No. of bitstreams: 11
PADMANABHAN-THESIS-2017.pdf: 2712744 bytes, checksum: e30bb141e0471668e45809eaac246d15 (MD5)
Appendix_A.tex: 10829 bytes, checksum: e1d97cd99a3138ff90a524a83358d1b2 (MD5)
Appendix_B.tex: 5675 bytes, checksum: 020992855e76ea8b184c06e8836fe230 (MD5)
Chapter1_RP_v1.tex: 17675 bytes, checksum: 124245b0bfeeaeb7b543b804129c0573 (MD5)
Chapter2_RP_v2.tex: 24190 bytes, checksum: 71349dc2f02746701569404963765bce (MD5)
Chapter3_RP_v1.tex: 21424 bytes, checksum: ccd59c77ccf0a712572056b000938560 (MD5)
Chapter4_RP_v1.tex: 29382 bytes, checksum: c5f053ae36f1ec92879bdfd9248d6edc (MD5)
Chapter5_RP_v1.tex: 4156 bytes, checksum: 1db772204d6cc529bc9fcf1887b6d650 (MD5)
abs.tex: 4672 bytes, checksum: 705389f5412f90357d0aa151314fc92a (MD5)
ecethesis.tex: 5366 bytes, checksum: c49c8a7e72c45ea7215fb330c1f7a5a9 (MD5)
LICENSE.txt: 4218 bytes, checksum: e873e606a45d6f18c59db94e2ba6825f (MD5)
Previous issue date: 2017-04-24Embargo set by: Colleen Fallaw for item 102783
Lift date: 2019-08-10T21:27:21Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemU of I Only Restriction Lifted for Item 102783 on 2019-08-11T09:15:24Z
Recommended from our members
Nontopological Q-solitons and their Implications for Macroscopic Dark Matter
No full textQ-balls are stable, compact objects (more precisely, nontopological solitons) that can arise in complex scalar field theories with a U(1) symmetry in which the potential adheres to certain criteria. These objects are of phenomenological interest as candidates for macroscopic dark matter, an as of yet still relatively underconstrained region of dark matter parameter space. Many of the features of Q-balls -- including their size, charge, energy, and stability dynamics -- can be qualitatively and approximately quantitatively extracted from their potential under minimal assumptions, although exact solutions are only attainable numerically. A thorough analytic study of Q-balls leads to a simplified understanding of the interconnectedness of their parameters, attributes, and dynamics, culminating most notably in a direct mapping between global Q-ball parameters and related gauged and Proca Q-ball parameters.This work presents several novel results, as previously published by the author and collaborators, including: precise analytic profiles for global, gauged, and Proca Q-balls; proof of various Q-ball relations and identities; precise analytic estimates of a Q-ball's radius, charge, and energy in terms of a universal Q-ball parameter; new bounds on Q-ball radii and stability; and the aforementioned parameter mapping between global Q-balls and gauged and Proca Q-balls. More complex Q-solitons, including excited Q-balls and Q-shells, are also discussed. Together, these objects represent a new candidate class for dark matter
Integrated anatomy e-tutorial designed by medical students, combining articulate storyline 2 with images from Anatomy.Tv
No full textIncreasing accessibility to a wide variety of anatomy teaching resources online has made learning complicated for students, due to the large quantity, mixed quality and lack of review by professionals. Therefore, we set out to develop a one-stop E-tutorial, which encompasses gross and surface anatomy with clinical applications and relevance highlighted, with content verified by medical and digital professionals.
The University of Glasgow’s medical curriculum was reviewed to identify areas of teaching that required extra tailored resources to aid in areas of complex anatomy. An Anatomy E-tutorial on ‘Handand-Wrist’ was created using Articulate Storyline 2 software. The tutorial we created centered on the use of Anatomy.TV gross anatomical images. In addition, self-captured surface anatomy images and videos using digital-photography were incorporated into the package. Unique features of Articulate Storyline were utilized to ensure the users remained engaged throughout the E-Tutorial.
We successfully created a fully interactive anatomy tutorial on hand and wrist anatomy using a novel software package. This was tailored to students undertaking the Glasgow Medical School curriculum, but has relevance to all those who need to obtain an in-depth knowledge of hand and wrist anatomy. Student evaluation will be presented on the effectiveness of this type of tool for learning anatomy of this region.
This innovative use of Articulate Storyline 2, developed by students, for students, has created an excellent revision tool bringing together key elements of the medical curriculum in a single, easily accessible format. This will benefit student engagement with a complex area of anatomy.
Produced by students and tailored to the integrated anatomy teaching, this product will prove beneficial for our colleagues and other health professionals alike
Association of Genome-Wide Association Study (GWAS) identified SNPs and risk of breast cancer in an Indian population
No full textTo date, no studies have investigated the association of the GWAS-identified SNPs with BC risk in Indian population. We investigated the association of 30 previously reported and replicated BC susceptibility SNPs in 1,204 cases and 1,212 controls from a hospital based case-control study conducted at the Tata Memorial Hospital, Mumbai. As a measure of total susceptibility burden, the polygenic risk score (PRS) for each individual was defined by the weighted sum of genotypes from 21 independent SNPs with weights derived from previously published estimates of association odds-ratios. Logistic regression models were used to assess risk associated with individual SNPs and overall PRS, and stratified by menopausal and receptor status. A total of 11 SNPs from eight genomic regions (FGFR2, 9q31.2, MAP3K, CCND1, ZM1Z1, RAD51L11, ESR1 and UST) showed statistically significant (p-value = 0.05) evidence of association, either overall or when stratified by menopausal status or hormone receptor status. BC SNPs previously identified in Caucasian population showed evidence of replication in the Indian population mainly with respect to risk of postmenopausal and hormone receptor positive BC. © 2017 The Author(s)
Development of Integrated Anatomy E-Tutorial by Medical Students, Using Anatomy-TV
No full textBackground: With increasing availability of a huge variety of resources online for anatomy learning, variability in the quantity and reliability of information makes learning complicated for students. Hence, we created a student-made E-tutorial as a one-stop resource, which integrates gross anatomy, surface anatomy, and clinical relevance, with content verified by teaching staff.
Summary of work: Review of the University of Glasgow’s medical curriculum highlighted areas that needed reinforcement. Articulate Storyline software was used to create an Anatomy E-tutorial on ‘Hand-and-Wrist’. High-quality gross anatomical images from Anatomy-TV, and surface anatomy images and videos captured by digital-photography, were our main focus. Interactive features of Articulate Storyline were employed to allow an engaging user-experience.
Summary of results: This is a pilot study and end-user evaluation will be conducted to assess the effectiveness of the E-Tutorial. Target end-users are Years 1 and 2 medical students at the University of Glasgow. Results will be presented at the conference.
Discussion: Information online is not tailored to the curriculum and are not always verified by experts. Also, due to the lack of required resources online, production of our own videos and images was necessary to address requirements of the curriculum. After end-user evaluation, quantitative and qualitative data will be analysed and presented.
Conclusion: This E-Tutorial encompasses various aspects of anatomy teaching, serving as a guide and revision tool. It is a unique attempt at creating an educational resource using Articulate Storyline, which has not been attempted before.
Take-home messages: This product will help our colleagues as it is made by students and tailored to the integrated anatomy teaching
