Design and Implementation of an FPGA-based Real-time Simulator for a Dual Three-Phase Induction Motor Drive

Gregor, Raul,Valenzano, Guido,Rodas, Jorge,Rodriguez-Pineiro, Jose,Gregor, Derlis The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2

This paper presents a digital hardware implementation of a real-time simulator for a multiphase drive using a field-programmable gate array (FPGA) device. The simulator was developed with a modular and hierarchical design using very high-speed integrated circuit hardware description language (VHDL). Hence, this simulator is flexible and portable. A state-space representation model suitable for FPGA implementations was proposed for a dual three-phase induction machine (DTPIM). The simulator also models a two-level 12-pulse insulated-gate bipolar transistor (IGBT)-based voltage-source converter (VSC), a pulse-width modulation scheme, and a measurement system. Real-time simulation outputs (stator currents and rotor speed) were validated under steady-state and transient conditions using as reference an experimental test bench based on a DTPIM with 15 kW-rated power. The accuracy of the proposed digital hardware implementation was evaluated according to the simulation and experimental results. Finally, statistical performance parameters were provided to analyze the efficiency of the proposed DTPIM hardware implementation method.

Design and Implementation of an FPGA-based Real-time Simulator for a Dual Three-Phase Induction Motor Drive

Raul Gregor,Guido Valenzano,Jorge Rodas,Jose Rodriguez-Pineiro,Derlis Gregor 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2

This paper presents a digital hardware implementation of a real-time simulator for a multiphase drive using a field-programmable gate array (FPGA) device. The simulator was developed with a modular and hierarchical design using very high-speed integrated circuit hardware description language (VHDL). Hence, this simulator is flexible and portable. A state-space representation model suitable for FPGA implementations was proposed for a dual three-phase induction machine (DTPIM). The simulator also models a two-level 12-pulse insulated-gate bipolar transistor (IGBT)-based voltage-source converter (VSC), a pulse-width modulation scheme, and a measurement system. Real-time simulation outputs (stator currents and rotor speed) were validated under steady-state and transient conditions using as reference an experimental test bench based on a DTPIM with 15 kW-rated power. The accuracy of the proposed digital hardware implementation was evaluated according to the simulation and experimental results. Finally, statistical performance parameters were provided to analyze the efficiency of the proposed DTPIM hardware implementation method.

Effect of Lactobacilli Oral Supplement on the Vaginal Microflora of Antibiotic Treated Patients : Randomized, Placebo - Controlled Study

Gregor Reid,Jo-Anne Hammond,Andrew W. Bruce 한국식품영양과학회 2003 Preventive Nutrition and Food Science Vol.8 No.2

Many antibiotic monographs cite the induction of vaginal infections as a possible side effect. Invariably, this is believed to be due to Candida albicans, and empirical therapy is given. However, recent studies raise the question of the extent to which yeast do infect the host after antibiotic use. A double-blind, randomized, placebo-controlled study was undertaken on female patients to determine how many yeast infections occurred following 10 days antibiotic use. In addition, the study was designed to examine whether oral use of probiotic lactobacilli can reduce the risk of vaginal infection. Twenty four patients diagnosed with respiratory, oral or throat infections received one of several types of antibiotic for 10 days, and two capsules containing 10^9 dried Lactobacillus rhamnosus GR-1 and L. fermentum RC-14 from the day of commencement of antibiotic therapy for 21 days. The most commonly prescribed antibiotic was biaxin (clarithromycin). All but one patient had lactobacilli in the vagina upon entry to the study, and none developed yeast vaginitis or diarrhea during treatment or 20 days after completion of antibiotics. The mean Nugent score was higher in the placebo than the lactobacilli group (4.1 versus 2.4), and three cases of bacterial vaginosis arose (25% incidence compared to 0% in the lactobacilli group) in the placebo group (2 receiving cefuroxime, 1 on biaxin). The study suggested that current antibiotic use is not necessarily associated with either diarrhea or yeast infection, as is often surmised. Nevertheless, daily use of probiotics was safe and could potentially reduce the risk of patients developing bacterial vaginosis after antibiotic use.

PROBIOTICS AND HEALTH

Gregor Reid,PhD,MBA 한국식품영양과학회 2001 한국식품영양과학회 학술대회발표집 Vol.50 No.-

The ability of microbial strains to confer health benefits to human and animal hosts is not a feature of many organisms. Lactic acid bacteria are the most commonly used bacteria applied as probiotics and there is now strong evidence that certain strains confer tangible benefits to the host. In terms of preventing infection, the ability of probiotic lactobacilli to colonize the tissue site, even temporarily, and inhibit growth and adhesion of pathogens, has been documented. Using molecular tools, such as RAPD and DGGE, probiotic organisms can be tracked through the intestine and in the vagina, and their impact on the flora assessed. Arguably, strains L. rhamnosus GG and GR-1 are the most studied probiotic strains in terms of human application to the gut (GG and GR-1) and vagina (GR-1). Combined with L. fermentum RC-14, GR-1 provides a two-pronged therapeutic for the intestine and urogenital tract. Care in manufacturing and distribution is essential to ensure that optimal doses of probiotics are accessible to consumers and patients.

Cranberry Juice to Reduce Bladder Biofilms and Infection in Geriatric and Spinal Cord Injured Patients with Dysfunctional Bladders

Gregor Reid,Patrick Potter,Dominique Lam,Diny Warren,Michael Borrie,Keith Hayes 한국식품영양과학회 2003 Preventive Nutrition and Food Science Vol.8 No.1

There is evidence to suggest that cranberry juice supplements improve the health of the urinary tract by inhibiting the binding of fimbriated uropathogenic E. coli to the bladder mucosa. In patients with neurogenic bladders, urinary tract infections (UTI) are particularly common and often poorly managed by antibiotic treatment. A double-blind, randomized, placebo-controlled trial was undertaken on 29 geriatric and spinal cord injured patients with dysfunctional bladders. They received three times daily at mealtimes a 4 oz bottle of cranberry juice (Ocean Spray Cranberries, USA) or a specially prepared synthetic placebo drink. Two episodes of UTI arose in week one of cranberry intake and none thereafter, compared to four episodes of UTI in 4 placebo patients in weeks four, six and 10. Mean bacterial adhesion counts on bladder cells of the patients rose during the first month of treatment in 71% of the placebo patients compared to only 31% of cranberry patients (p<0.001). The difference persisted to some extent for the second and third months. Bacterial adhesion levels correlated with culture findings (higher adhesion and higher viable counts in urine) (p<0.001), positive leukocyte nitrite tests (136±131 bacteria per cell versus 52±86 in negative tests) (p<0.001), and higher white blood cell counts (>10) per high power field (126±125 versus 48±85 bacteria per cell) (p<0.001). E. coli was the most frequently isolated organism (40% samples) followed by K. pneumoniae (17%) and a number of other uropathogens. Group B Streptococci, and coagulase negative Staphylococcus were recovered from urine in 4 samples but were not associated with any red blood cell presence. The daily intake of cranberry juice, in amounts which are not detrimental to long term compliance, appeared to have a role in reducing the risk of bladder colonization and infection in a highly susceptible patient population.

Logic and Religion in Wŏnhyo’s Buddhism: Focusing on Wŏnhyo’s Critical Discussions on Inference

Gregor PAUL 동국대학교 불교문화연구원 2019 International Journal of Buddhist Thought & Cultur Vol.29 No.2

In my reflections about logic and religion in Wŏnhyo’s Buddhism, I presuppose that there exist logical laws normatively valid for all human beings. My analyses then focus on the question of whether Wŏnhyo held that in, and because of, certain Buddhist teachings, some such laws as for instance the Principle of non-contradiction need not be accepted. Answering this question in the negative, I argue that Wŏnhyo, in spite of being a devout Buddhist, uncompromisingly rejected logical inconsistencies, thus comparing favorably to many medieval Christian scholastics. In particular, I deal with Wŏnhyo’s use of “skillful means” (upāya) as a device to avoid contradiction. However, I also admit that important questions remain open, and I try to make it clear that, from a methodological point of view, skillful means is a rather dubious tool to solve logical problems.

Ability of Lactobacillus GR - 1 and RC - 14 to Stimulate Host Defences and Reduce Gut Translocation and Infectivity of Salmonella typhimurium

Gregor Reid,Duane Charbonneau,Silvia Gonzalez,Gillian Gardiner,Julie Erb,Russ Poehner,Andrew W. Bruce 한국식품영양과학회 2002 Preventive Nutrition and Food Science Vol.7 No.2

Gastrointestinal infections kill over two million people each year, and pathogen contamination of livestock causes many cases of food poisoning. Two candidate intestinal probiotic strains, L. rhamnosus GR - 1 and L. fermentum RC - 14 were found to inhibit the growth of Salmonella typhi, Shigella dysenteriae, E. coli O157:H7, Listeria monocytogenes, L. innocua, Enterococcus faecalis, and Bacteroides fragilis. In a series of mouse experiments, L. rhamnosus GR - 1 and L. rhamnosus GG protected against S. typhimurium infection and translocation to the liver and spleen, reduced mortality and induced intestinal phagocytic and immunoglobulin responses. In a second series of experiments, the combination of L. rhamnosus GR - 1 and L. fermentum RC - 14 was superior to L. rhamnosus GG and placebo in protecting the mice from the lethal effect of salmonella. In summary, the use of combinations of probiotic lactobacilli as dietary supplements or foods could be considered for people at high risk of salmonella intestinal infection. Given the post - infection complications that can arise, such natural methods warrant further exploration especially given the increasing problem of antibiotic resistance and the lack of alternative measures available to many developing countries.

New and emerging sciences and technologies, ableism, transhumanism and religion, faith, theology and churches

Gregor Wolbring 성공회대학교 신학연구소 2007 Madang: Journal of Contextual Theology Vol.7 No.-

Heat Losses through Polyurethane Valve Insulation

Gregor Radonjic,Jurij Krope 대한기계학회 1993 International Symposium on Transport Phenomena in Vol.3 No.1

CROSS-CULTURAL COMMUNICATION THROUGH FASHION AND BRAND CONSCIOUSNESS

Gregor Pfajfar,Aviv Shoham,Nihat Anil,Ossi Pesämaa,Maja Makovec Brenčič 글로벌지식마케팅경영학회 2015 Global Fashion Management Conference Vol.2015 No.06

The global luxury market is relentlessly growing over the last few decades, defying the global economic crisis. It is estimated that the luxury market is made up by a continuously enlarging heterogeneous group of 330 to 380 million consumers worldwide. The consumption of luxuries goes beyond the riches and wealth of countries, as the highest luxury spenders are to be found in places like the Middle East, Japan, and China. Luxury goods’ penetration relatively to GDP is low in countries like Germany and the U.S. and high in Italy, France, and South Korea. Wealth and economics alone cannot explain the economics underlying luxury consumption; culture is an important driver of growth in this sector. Culture gives meaning to luxuries, affects the perceived value and motivations to buy luxury goods, and determines luxuries’ signaling power and potency as differentiators and identity signifiers. Today, despite the size, growth and geographical spread of the luxury goods market, cross-cultural research is limited and rather scattered in different fields. Much of the research undertaken draws from Hofstede’s typology of culture and focuses on a narrow range of conceptual issues. The purpose of this presentation is to review and summarize existing cross-cultural research on luxury products and to identify fruitful future research directions that will expand our understanding of luxury goods marketing. In addition, attention will be given to examining current trends and behaviors in the field