Design of a High-Performance High-Pass Generalized Integrator Based Single-Phase PLL

Grid-interactive power converters are normally synchronized to the grid using phase-locked loops (PLLs). The performance of the PLLs is affected by the non-ideal conditions in the sensed grid voltage such as harmonics, frequency deviations and dc offsets in single-phase systems. In this paper, a single-phase PLL is presented to mitigate the effects of these non-idealities. This PLL is based on the popular second order generalized integrator (SOGI) structure. The SOGI structure is modified to eliminate of the effects of input dc offsets. The resulting SOGI structure has a high-pass filtering property. Hence, this PLL is termed as high-pass generalized integrator based PLL (HGI-PLL). It has fixed parameters which reduces the implementation complexity and aids in the implementation in low-end digital controllers. The HGI-PLL is shown to have least resource utilization among the SOGI based PLLs with dc cancelling capability. Systematic design methods are evolved leading to the design that limits the unit vector THD to within 1% for given non-ideal input conditions in terms of frequency deviation and harmonic distortion. The proposed designs achieve the fastest transient response. The performance of this PLL has been verified experimentally. The results are found to agree with the theoretical prediction.Comment: 22 pages, 13 figures and 2 table

Efficacy of Mitomycin C in External Dacryocystorhinostomy: A Randomised Control trial

OBJECTIVES: The aim of this study is to compare the success rates of External Dacryocystorhinostomy (Ext-DCR) with and without the intraoperative application of Mitomycin C (MMC) at the ostium site. METHODS: 60 cases of Primary Acquired Nasolacrimal Duct Obstruction (PANDO) which met the inclusion criteria were randomized into 2 groups of 30 each.The MMC group received 0.4ml/mg of MMC intraoperatively at the ostium site while the Control group was given normal saline as placebo.The outcomes measured were subjective symptomatic grading by Muck scoring system,functional success by Fluorescene Dye Disappearance Test (FDDT) and anatomical duct patency by syringing at 1week,1 month and 3 month follow up. RESULTS: There was female preponderance with 78.3%. There was no statistically significant difference in the subjective, functional and anatomical success rates between the 2 groups at 1 week,1 month and 3 month follow up (p > 0.1). The overall success rate was 96.7% in MMC group and 93.35 in Controls (p = 0.546). There were no serious adverse effects seen with MMC use. We conclude that Mitomycin C application may not show an added in Primary External DCR for Primary Adult Nasolacrimal Obstruction

Model-based Role Based Access Control for RESTful Spring applications

Mudelipõhine tarkvaraarendus on kaasaegse tarkvara arendamise metoodika, mille eesmärk on lahendada konkreetseid probleeme, luues domeeni mudelid ja pakkudes lahendust kontseptuaalsel viisil. Domeenipõhine keel (DSL) on arvuti keel, mis võimaldab lahendada probleeme konkreetses domeenis. Käesoleva lõputöö eesärgiks on arendada tarkvaraline vahend, mis aitab luua automaatselt tarkvarakoodi rolli-põhise ligipääsu kontrolli abil RESTful rakendustele. Selle jaoks soovime pakkuda spetsifikatsiooni, mis läbi DSL-i sisendi kirjeldaks andmebaasi kihtide komponente (näiteks klassid ja hoidlad), vahekihtide komponente (st Resources/Assemblers, Controllers), ja rolli-põhise ligipääsu kontrolli mudelit koos sihtrakendusega. Tuginedes reeglitele, genereerib meie vahend koodi, mis sisaldab RBAC autentimisega / autoriseerimisega seotud konfiguratsiooni ja abiklasse. See on kogu RESTful Spring Boot rakenduse tuumik koos kommentaaride ning baaskoodiga, mille sisendiks on etteantud RBAC mudel.Model-driven software development is the modern software development methodology that aims at solving a specific problem by creating the domain models and providing the solution in a conceptual way. Domain-Specific Language (DSL) is the computer language that allows solving a problem in a specific domain. The goal of this thesis is to develop a software tool that helps to generate the software codes automatically with Role Based Access Control for a RESTful application. In this context, we want to provide a resource specification as an input to the software tool through DSL for describing the database layer components (i.e. Entity classes and Repositories), the integration layer components (i.e. Resources/Assemblers, Controllers), and a Role-Based Access Control model to be associated with a target application. Based on the definitions, our tools will generate code, including RBAC authentication/authorization related configuration and helper classes. Thus, the skeleton for the RESTful Spring Boot application with the annotations and basic code to enforce the RBAC model provided as input

Characterizing infection in anti-neutrophil cytoplasmic antibody-associated vasculitis:results from a longitudinal, matched-cohort data linkage study

We wish to thank Information Division Services Scotland for assisting with data linkage and data access in the National Safe Haven. Information presented in this article was previously presented as a poster at the American College of Rheumatology Annual Conference 2018, Chicago, IL, USA. The study was conceived by S.H.S., A.M., C.B. and N.B. All authors contributed to the study design and data collection. Data analysis and interpretation and drafting of the manuscript were conducted by all authors. C.B. and N.B. were joint senior authors. All authors critically reviewed the manuscript and approved the final version. Funding: S.H.S. and the study were funded by the Aberdeen Development Trust and the Farr Institute of Health Informatics Research. The Farr Institute is supported by a 10-funder consortium: Arthritis Research UK, the British Heart Foundation, Cancer Research UK, the Economic and Social Research Council, the Engineering and Physical Sciences Research Council, the Medical Research Council, the National Institute of Health Research, the National Institute for Social Care and Health Research (Welsh Assembly Government), the Chief Scientist Office (Scottish Government Health Directorates) and the Wellcome Trust (Scotland MR/K007017/1). Disclosure statement: L.E. is a GlaxoSmithKline employee. The other authors have declared no conflicts of interest.Peer reviewedPublisher PD

Effect of clock gating in conditional pulse enhancement flip-flop for low power applications

Flip-Flops (FFs) play a fundamental role in digital designs. A clock system consumes above 25% of total system power. The use of pulse-triggered flip-flops (P-FFs) in digital design provides better performance than conventional flip-flop designs. This paper presents the design of a new power-efficient implicit pulse-triggered flip-flop suitable for low power applications. This flip-flop architecture is embedded with two key features. Firstly, the enhancement in width and height of triggering pulses during specific conditions gives a solution for the longest discharging path problem in existing P-FFs. Secondly, the clock gating concept reduces unwanted switching activities at sleep/idle mode of operation and thereby reducing dynamic power consumption. The post-layout simulation results in cadence software based on CMOS 90-nm technology shows that the proposed design features less power dissipation and better power delay performance (PDP) when compared with conventional P-FFs. Its maximum power saving against conventional designs is up to 30.65%