Modeling and balancing control for torque generation in combustion event scale for multi-cylinder SI engines

Po Li,Tielong Shen,Kaipei Liu,Junichi Kako,Shozo Yoshida 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10

This paper presents a torque balancing control method for multi-cylinder SI engines. The deviation in average torque generation of sections with equal crank angle interval in ignition event scale is introduced as the index for balancing. Moreover, based on crank shaft dynamics in crank angle domain, an estimation method for this index from engine speed measurement is developed to avoid torque measurement. According to analysis in coupling characteristic in torque generation between cylinders, a 2nd order ARMA model is established for the dynamics from spark ignition to the index. Then model predictive control technique is used in regulation. Finally, the proposed model, estimation method and controller are validated by simulation where the engine model is provided by SICE benchmark problem.

Determination of Optimal Irrigation Rate and Time for Various Soils Using Hydraus-1d Model

Po Li,Feiqing Wu,Zhengfeng Wu,Kefeng Zhang 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

Spectral Analysis of Audio Signals with Noise Assisted Empirical Mode Decomposition

Poly Rani Ghosh,Keikichi Hirose,Md. Khademul Islam Molla 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.4

A data adaptive approach to spectral analysis of audio signals is implemented in this paper. The audio signals are non-stationary as well as non-linear in nature and the traditional Fourier based spectral representation is not effective. The Hilbert spectral analysis implemented by noise assisted bivariate empirical mode decomposition (NA-BEMD) is introduced here as an efficient spectral representation scheme of audio signals. In BEMD, the fractional Gaussian noise (fGn) and analyzing speech signal are used as two separate variables. Both signals are decomposed together yielding a finite set of intrinsic mode functions (IMFs) for individual variables (signals). The use of fGn implements BEMD with dyadic filterbank characteristics. The instantaneous frequencies of individual IMFs are computed by applying Hilbert transform and then the time-frequency representation is achieved by arranging the energy with respect to time and frequency simultaneously. Such representation is called Hilbert spectrum (HS) which is analogous to spectrogram. The marginal HS derived from HS corresponds the total energy at each frequency component. The experimental results show that the Hilbert spectral analysis provides better representation of audio signal contents compared to the Fourier based approach.

Influence of Soil Type on Single and Competitive Retention Behavior of Inorganic Macro Cations in Binary as well as Ternary Solution

Poly Buragohain,Peng Lin,Ankit Garg,Sreedeep S,David Hui 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.12

Inorganic macro cations (Na+, K+ and Ca+) co-exist in agricultural and municipal landfill sites. The retention behavior of these ions in different soils and combinations (binary and ternary system) has not been fully understood by previous studies. This study seeks to probe into the retention behavior of macro cations (Na+, K+, Ca+2) in six different soils under multiple combinations of ions solution. The retention of common ions was quantified by using Freundlich and Langmuir isotherms. Na+ (single) pollutant-soil interaction was desorbed in most of the soils. The retention of K+ and Ca+2 was much greater than that of Na+. There is no definite trend for retention of Na+ in the presence of K+. For all soils, the retention results of K+ in the presence of Na+ decreased. Affinity for K+ was greater than that for Ca+2 in most of the soils. This study also demonstrated the affinity sequence of the ion retention for each soil and the percentage reduction of ions in competition with respect to single ions. Anomalous trends of the isotherm parameter fitting suggested the limitation of the mathematical models in predicting the experimental data. These results can be helpful in improving accuracy of fate prediction of pollutant fate and thus, design of waste containment facilities for various wastes that contains inorganic ions.

Risk indicators related to periimplant disease: an observational retrospective cohort study

Poli, Pier Paolo,Beretta, Mario,Grossi, Giovanni Battista,Maiorana, Carlo Korean Academy of Periodontology 2016 Journal of Periodontal & Implant Science Vol.46 No.4

Purpose: The aim of the present study was to retrospectively investigate the influence of potential risk indicators on the development of peri-implant disease. Methods: Overall, 103 patients referred for implant treatment from 2000 to 2012 were randomly enrolled. The study sample consisted of 421 conventional-length (>6 mm) non-turned titanium implants that were evaluated clinically and radiographically according to preestablished clinical and patient-related parameters by a single investigator. A non-parametric Mann-Whitney U test or Kruskal-Wallis rank test and a logistic regression model were used for the statistical analysis of the recorded data at the implant level. Results: The diagnosis of peri-implant mucositis and peri-implantitis was made for 173 (41.1%) and 19 (4.5%) implants, respectively. Age (${\geq}65$ years), patient adherence (professional hygiene recalls <2/year) and the presence of plaque were associated with higher peri-implant probing-depth values and bleeding-on-probing scores. The logistic regression analysis indicated that age (P=0.001), patient adherence (P=0.03), the absence of keratinized tissue (P=0.03), implants placed in pristine bone (P=0.04), and the presence of peri-implant soft-tissue recession (P=0.000) were strongly associated with the event of peri-implantitis. Conclusions: Within the limitations of this study, patients aged ${\geq}65$ years and non-adherent subjects were more prone to develop peri-implant disease. Therefore, early diagnosis and a systematic maintenance-care program are essential for maintaining peri-implant tissue health, especially in older patients.

Efficacy of 1-MCP on the Internal Structure of Japanese Persimmon

( Poly Karmoker ),( Wako Obatake ),( Fumina Tanaka ),( Fumihiko Tanaka ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1

The efficacy of 1-MCP on the structural properties of Japanese persimmon was investigated at 0°C and 25°C for 8 and 4 weeks, respectively. X-ray computed tomography was employed to quantify the structural properties. The physicochemical properties such as moisture, apparent density, bio-yield stress, TSS and external color were measured destructively. 1-MCP satisfactorily delayed postharvest ripening in terms of bio-yield stress, L^* and hue angle value at both temperatures. The average CT value, standard deviation, and high density part progressed over the storage period at both temperatures. The degree of increment of those properties of the 1-MCP treated fruit was much lower compared to other treated fruit. Peak height of the control and 1-MCP treated fruit was nearly constant, whereas it increased in the ethylene and 1-MCP+ethylene treated fruit. The histogram profile also shifted to a high-density region slightly in the 1-MCP treated fruit. Whereas the histogram profile of the ethylene treated fruit was shifted most toward the high-density region with an increment of peak height. The changes in porosity and thermal conductivity in the 1-MCP treated fruit were smaller than those in the control, ethylene and 1-MCP+ethylene treated fruit. The changes in porosity and thermal conductivity of the ethylene treated fruit were significantly higher than those of all treated fruit at the end of storage period. The physicochemical properties were strongly correlated with the average CT value and standard deviation at both temperatures. The L^* value, hue angle, moisture content and bio-yield stress were negatively correlated with the average CT value and standard deviation, whereas the apparent density and TSS content were positively correlated. Thus X-ray CT images could be used to quantify the structural properties of persimmon fruit. The porosity and thermal conductivity distribution could be measured by using an X-ray CT device without destruction over the storage period. 1-MCP could suppress the changes in the internal structure of Japanese persimmon at 0°C and 25°C for 8 and 4 weeks, respectively.

Risk indicators related to periimplant disease: an observational retrospective cohort study

Pier Paolo Poli,Mario Beretta,Giovanni Battista Grossi,Carlo Maiorana 대한치주과학회 2016 Journal of Periodontal & Implant Science Vol.46 No.4

Purpose: The aim of the present study was to retrospectively investigate the influence of potential risk indicators on the development of peri-implant disease. Methods: Overall, 103 patients referred for implant treatment from 2000 to 2012 were randomly enrolled. The study sample consisted of 421 conventional-length (>6 mm) nonturned titanium implants that were evaluated clinically and radiographically according to preestablished clinical and patient-related parameters by a single investigator. A non-parametric Mann-Whitney U test or Kruskal-Wallis rank test and a logistic regression model were used for the statistical analysis of the recorded data at the implant level. Results: The diagnosis of peri-implant mucositis and peri-implantitis was made for 173 (41.1%) and 19 (4.5%) implants, respectively. Age (≥65 years), patient adherence (professional hygiene recalls <2/year) and the presence of plaque were associated with higher peri-implant probing-depth values and bleeding-on-probing scores. The logistic regression analysis indicated that age (P=0.001), patient adherence (P=0.03), the absence of keratinized tissue (P=0.03), implants placed in pristine bone (P=0.04), and the presence of peri-implant soft-tissue recession (P=0.000) were strongly associated with the event of peri-implantitis. Conclusions: Within the limitations of this study, patients aged ≥65 years and non-adherent subjects were more prone to develop peri-implant disease. Therefore, early diagnosis and a systematic maintenance-care program are essential for maintaining peri-implant tissue health, especially in older patients.

Second-to-Fourth Digit Ratio (2D:4D) in Psychiatric Disorders: A Systematic Review of Case-control Studies

Laura Fusar-Poli,Alessandro Rodolico,Serena Sturiale,Bianca Carotenuto,Antimo Natale,Davide Arillotta,Spyridon Siafis,Maria Salvina Signorelli,Eugenio Aguglia 대한정신약물학회 2021 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.19 No.1

The second-to-fourth digit ratio (2D:4D) is an indirect, retrospective, non-invasive measure that correlates negatively with intrauterine exposure to testosterone. The present meta-analysis aimed to evaluate if 2D:4D differs between patients with psychiatric disorders and controls. In September 2019, we searched in Web of Knowledge, PsycINFO, Embase, and CINHAL, and retrieved 619 papers. We finally included 43 case-control studies which compared the 2D:4D ratio of patients with autism spectrum disorder (ASD) (n = 16), schizophrenia (n = 8), gender non-conformity (n = 7), addictions (n = 5), attention deficit-hyperactivity disorder (ADHD) (n = 4), mood disorders (n = 2), and intellectual disability (n = 1) to non-clinical controls. Meta-analyses showed that, overall, psychiatric patients had lower 2D:4D than healthy controls (n = 43, overall sample = 9,484, mean difference = −0.0056, 95% confidence interval from −0.0093 to −0.002, I2 = 74%), with more pronounced differences in the right hand, males, and children. Considering psychiatric disorders individually, significant differences were found in the ASD, ADHD, and addictions groups, in which 2D:4D was significantly lower than healthy controls. Conversely, the right hand of males with schizophrenia showed higher 2D:4D than healthy controls. No other significant differences were detected. Although our results need to be cautiously interpreted and find limited applications in clinical practice, they may suggest that 2D:4D is altered in some psychopathological conditions, underlining the role of prenatal exposure to sex steroids in the etiology of psychiatric disorders.

농부의 손으로 가꾼 낙원 제주도의 ‘생각하는 정원’

포운 폴리(Poun Poly) 관훈클럽 2012 관훈저널 Vol.- No.125

Supremacy of Value-Added Tax: A Perspective from South Asian Nations

Md Noor Uddin MILON(Md Noor Uddin MILON ),Yousuf KAMAL(Yousuf KAMAL ),Tahmina Akter POLI(Tahmina Akter POLI ) 한국유통과학회 2023 The Journal of Asian Finance, Economics and Busine Vol.10 No.2

The study attempts to examine the relationship among revenue growth factors from different angles and provides a comprehensive overview of tax revenue collection for developing countries. The impact of income tax, customs duty, and value-added tax on the gross domestic product is examined using the ordinary least-square (OLS) multiple regression approach. To confirm the association, a multiple regression model is applied to time-series data. SPSS software, MS Excel, is used to draw the empirical results, trend analysis, and some graphical presentation to reach the study’s objective. The findings show that while the value-added tax has a significant impact and the highest coefficient, regardless of country, income tax and customs duty may or may not be significant depending on the circumstances. It triggers effectual and efficacious economic growth. The paper has implications in policy-making areas where governments are seeking how to stimulate revenue growth effectively and efficiently. To promote economic growth, the tax net and tax rate on luxury goods should be increased along with human resources in the tax administration for the short term. But in the long term, decentralization & digitization of tax administration, dismantling the existing tax barriers and good governance are necessary.