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Alma Angeli de Castro Placido,황성수 한국사회과학협의회 2019 Korean Social Science Journal Vol.46 No.1
This paper evaluates the Philippine’s economic development between the years 2010 and 2015, under the leadership of former President Benigno "Noynoy" Aquino, III. This study presents an overview of the Philippine’s economic development strategy and utilize the results from the Global Competitiveness Index (GCI) Report, Human Development Index (HDI) Report, and Environmental Performance Index (EPI) Report as a measure to evaluate the economic growth. Both quantitative analysis and qualitative analysis are used to compare the impact of the Philippine’s development between 2010 and 2015. To the exception of the macroeconomic environment pillar of the GCI and ecosystem vitality issue area of the EPI, it is found that there are significant differences existing in each of the development indicators.
( Timothy R Angeli ),( Gregory O Grady ),( Niranchan Paskaranandavadivel ),( Jonathan C Erickson ),( Peng Du ),( Andrew J Pullan ),( Ian P Bissett ),( Leo K Cheng ) 대한소화기기능성질환·운동학회 2013 Journal of Neurogastroenterology and Motility (JNM Vol.19 No.2
Background/Aims Small intestine motility is governed by an electrical slow wave activity, and abnormal slow wave events have been associated with intestinal dysmotility. High-resolution (HR) techniques are necessary to analyze slow wave propagation, but progress has been limited by few available electrode options and laborious manual analysis. This study presents novel methods for in vivo HR mapping of small intestine slow wave activity. Methods Recordings were obtained from along the porcine small intestine using flexible printed circuit board arrays (256 electrodes; 4 mm spacing). Filtering options were compared, and analysis was automated through adaptations of the falling-edge variable- threshold (FEVT) algorithm and graphical visualization tools. Results A Savitzky-Golay filter was chosen with polynomial-order 9 and window size 1.7 seconds, which maintained 94% of slow wave amplitude, 57% of gradient and achieved a noise correction ratio of 0.083. Optimized FEVT parameters achieved 87% sensitivity and 90% positive-predictive value. Automated activation mapping and animation successfully revealed slow wave propagation patterns, and frequency, velocity, and amplitude were calculated and compared at 5 locations along the intestine (16.4 ± 0.3 cpm, 13.4 ± 1.7 mm/sec, and 43 ± 6 μV, respectively, in the proximal jejunum). Conclusions The methods developed and validated here will greatly assist small intestine HR mapping, and will enable experimental and translational work to evaluate small intestine motility in health and disease.
Flow solutions around rectangular cylinders: The question of spatial discretization
Roberto Corsini,Diego Angeli,Enrico Stalio,Sergio Chibbaro,Andrea Cimarelli 한국풍공학회 2022 Wind and Structures, An International Journal (WAS Vol.34 No.1
The aerodynamics of blunt bodies with separation at the sharp corner of the leading edge and reattachment on the body side are particularly important in civil engineering applications. In recent years, a number of experimental and numerical studies have become available on the aerodynamics of a rectangular cylinder with chord-to-thickness ratio equal to 5 (BARC). Despite the interest in the topic, a widely accepted set of guidelines for grid generation about these blunt bodies is still missing. In this work a new, well resolved Direct Numerical Simulation (DNS) around the BARC body at Re=3000 is presented and its results compared to previous DNSs of the same case but with different numerical approaches and mesh. Despite the simulations use different numerical approaches, mesh and domain dimensions, the main discrepancies are ascribed to the different grid spacings employed. While a more rigorous analysis is envisaged, where the order of accuracy of the schemes are kept the same while grid spacings are varied alternately along each spatial direction, this represents a first attempt in the study of the influence of spatial resolution in the Direct Numerical Simulation of flows around elongated rectangular cylinders with sharp corners
Jirapun Pongfai,Chrissanthi Angeli,Peng Shi,Xiaojie Su,Wudhichai Assawinchaichote 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.1
In this paper, an adaptive swarm learning process (SLP) algorithm for designing the optimal proportionalintegral and derivative (PID) parameter for a multiple-input multiple-output (MIMO) control system is proposed. The SLP algorithm is proposed to improve the performance and convergence of PID parameter autotuning by applying the swarm algorithm and the learning process. The adaptive SLP algorithm improves the stability, performanceand robustness of the traditional SLP algorithm to apply it to a MIMO control system. It can update the onlineweights of the SLP algorithm caused by the errors in the settling time, rise time and overshoot of the system basedon a stable learning rate. The gradient descent is applied to update the weights. The stable learning rate is verifiedbased on the Lyapunov stability theorem. Additionally, simulations are performed to verify the superiority of thealgorithm in terms of performance and robustness. Results that compare the adaptive SLP algorithm with the traditional SLP, a neural network (NN), the genetic algorithm (GA),the particle swarm and optimization (PSO) algorithmand the kidney-inspired algorithm (KIA) based on a two-wheel inverted pendulum system are presented. With respect to performance and robustness, the adaptive SLP algorithm provides a better response than the traditionalSLP, NN, GA, PSO and KIA.
Changes in the epidemiology and management of bacterial infections in cirrhosis
( Salvatore Piano ),( Marta Tonon ),( Paolo Angeli ) 대한간학회 2021 Clinical and Molecular Hepatology(대한간학회지) Vol.27 No.3
Patients with cirrhosis are susceptible to develop infections because of immune dysfunction, changes in microbiome and increase in bacterial translocation from the gut to systemic circulation. Bacterial infections can worse the clinical course of the disease, triggering the development of complications such as acute kidney injury, hepatic encephalopathy, organ failures and acute on chronic liver failure. In recent years, the spread of multi drug resistant bacteria made more challenging the management of infections in patients with cirrhosis. Hence, the mortality rate associated to sepsis is increasing in these patients. Therefore, the optimization of the management of infections has a high priority in cirrhosis. Herein we reviewed the recent changes in the epidemiology and the management of bacterial infections in patients with liver cirrhosis. (Clin Mol Hepatol 2021;27:437-445)
Sachira Kuruppu,Leo K Cheng,Recep Avci,Timothy R Angeli-Gordon,Nira Paskaranandavadivel 대한소화기 기능성질환∙운동학회 2022 Journal of Neurogastroenterology and Motility (JNM Vol.28 No.4
Background/Aims High-resolution extracellular mapping has improved our understanding of bioelectric slow-wave and spike-burst activity in the small intestine. The spatiotemporal correlation of electrophysiology and motility patterns is of critical interest to intestinal function but remains incompletely defined. Methods Intestinal jejunum segments from in vivo pigs and rabbits were exteriorized, and simultaneous high-resolution extracellular recordings and video recordings were performed. Contractions were quantified with strain fields, and the frequencies and velocities of motility patterns were calculated. The amplitudes, frequencies, and velocities of slow-wave propagation patterns and spike-bursts were quantified and visualized. In addition, the duration, size and energy of spike-burst patches were quantified. Results Slow-wave associated spike-bursts activated periodically at 10.8 ± 4.0 cycles per minute (cpm) in pigs and 10.2 ± 3.2 cpm in rabbits, while independent spike-bursts activated at a frequency of 3.2 ± 1.8 cpm. Independent spike-bursts had higher amplitude and longer duration than slow-wave associated spike-bursts (1.4 ± 0.8 mV vs 0.1 ± 0.1 mV, P < 0.001; 1.8 ± 1.4 seconds vs 0.8 ± 0.3 seconds, P < 0.001 in pigs). Spike-bursts that activated as longitudinal or circumferential patches were associated with contractions in the respective directions. Spontaneous peristaltic contractions were elicited by independent spike-bursts and travelled slower than slow-wave velocity (3.7 ± 0.5 mm/sec vs 10.1 ± 4.7 mm/sec, P = 0.007). Cyclic peristaltic contractions were driven by slow-wave associated spike-bursts and were coupled to slow-wave velocity and frequency in rabbit (14.2 ± 2.3 mm/sec vs 11.5 ± 4.6 mm/sec, P = 0.162; 11.0 ± 0.6 cpm vs 10.8 ± 0.6 cpm, P = 0.970). Conclusions Motility patterns were dictated by patterns of spike-burst patches. When spike-bursts were coupled to slow-waves, periodic motility patterns were observed, while when spike-bursts were not coupled to slow-waves, spontaneous aperiodic motility patterns were captured.
COMPARISON OF TWO MULTIPHASE PROCEDURES ON A COMMERCIAL VEHICLE IN RAIN CONDITIONS
Giovanni Lombardi,Antonio Ercoli,Marco Maganzi,Giacomo de Angeli 한국자동차공학회 2019 International journal of automotive technology Vol.20 No.6
In automotive design, the study of the water thin layer over a car due to rain is becoming increasingly important: the challenge is to obtain a way to describe the behavior of the water over a vehicle in rainy conditions and its interactions with wipers and drainage systems, to determine potential failures of the vehicle design. In this paper two similar numeric procedures have been realized with the software STAR CCM+® to analyze the dynamic of water thin layer starting from the impingement of the rain on the car surface and taking into account even the motion of the wipers over the windshield. Moreover, the water that flows through the drainage systems is monitored to figure out if the water could produce a malfunction of components near them. In order to describe each status of the water, many multiphase models are used. These methodologies have been applied on a commercial vehicle model and the results have been examined and compared to each other. The analysis shows a better description of the reality for one of them, leading to the possibility of using it as a design tool in the automotive industry.
Alexandre Liautaud,Prince A. Adu,Annalee Yassi,Muzimkhulu Zungu,Jerry M. Spiegel,Angeli Rawat,Elizabeth A. Bryce,Michelle C. Engelbrecht 한국산업안전보건공단 산업안전보건연구원 2018 Safety and health at work Vol.9 No.2
Background: Insufficient training in infection control and occupational health among healthcare workers (HCWs) in countries with high human immunodeficiency virus (HIV) and tuberculosis (TB) burdens requires attention. We examined the effectiveness of a 1-year Certificate Program in Occupational Health and Infection Control conducted in Free State Province, South Africa in an international partnership to empower HCWs to become change agents to promote workplace-based HIV and TB prevention. Methods: Questionnaires assessing reactions to the program and Knowledge, Attitudes, Skills, and Practices were collected pre-, mid-, and postprogram. Individual interviews, group project evaluations, and participant observation were also conducted. Quantitative data were analyzed using Wilcoxon signed-rank test. Qualitative data were thematically coded and analyzed using the Kirkpatrick framework. Results: Participants recruited (n ¼ 32) were mostly female (81%) and nurses (56%). Pre-to-post-program mean scores improved in knowledge (þ12%, p ¼ 0.002) and skills/practices (þ14%, p ¼ 0.002). Preprogram attitude scores were high but did not change. Participants felt empowered and demonstrated attitudinal improvements regarding HIV, TB, infection control, and occupational health. Successful projects were indeed implemented. However, participants encountered considerable difficulties in trying to sustain improvement, due largely to lack of pre-existing knowledge and experience, combined with inadequate staffing and insufficient management support. Conclusion: Training is essential to strengthen HCWs’ occupational health and infection control knowledge, attitudes, skills, and practices, and workplace-based training programs such as this can yield impressive results. However, the considerable mentorship resources required for such programs and the substantial infrastructural supports needed for implementation and sustainability of improvements in settings without pre-existing experience in such endeavors should not be underestimated.