• Title/Summary/Keyword: period ratio

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The First Photometric Study of NSVS 1461538: A New W-subtype Contact Binary with a Low Mass Ratio and Moderate Fill-out Factor

  • Kim, Hyoun-Woo;Kim, Chun-Hwey;Song, Mi-Hwa;Jeong, Min-Ji;Kim, Hye-Young
    • Journal of Astronomy and Space Sciences
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    • v.33 no.3
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    • pp.185-196
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    • 2016
  • New multiband BVRI light curves of NSVS 1461538 were obtained as a byproduct during the photometric observations of our program star PV Cas for three years from 2011 to 2013. The light curves indicate characteristics of a typical W-subtype W UMa eclipsing system, displaying a flat bottom at primary eclipse and the O'Connell effect, rather than those of an Algol/b Lyrae eclipsing variable classified by the northern sky variability survey (NSVS). A total of 35 times of minimum lights were determined from our observations (20 timings) and the SuperWASP measurements (15 ones). A period study with all the timings shows that the orbital period may vary in a sinusoidal manner with a period of about 5.6 yr and a small semi-amplitude of about 0.008 day. The cyclical period variation can be interpreted as a light-time effect due to a tertiary body with a minimum mass of 0.71 M. Simultaneous analysis of the multiband light curves using the 2003 version of the Wilson-Devinney binary model shows that NSVS 1461538 is a genuine W-subtype W UMa contact binary with the hotter primary component being less massive and the system shows a low mass ratio of q(mc/mh)=3.51, a high orbital inclination of 88.7°, a moderate fill-out factor of 30 %, and a temperature difference of ΔT=412 K. The O'Connell effect can be similarly explained by cool spots on either the hotter primary star or the cool secondary star. A small third-light corresponding to about 5 % and 2 % of the total systemic light in the B and V bandpasses, respectively, supports the third-body hypothesis proposed by the period study. Preliminary absolute dimensions of the system were derived and used to look into its evolutionary status with other W UMa binaries in the mass-radius and mass-luminosity diagrams. A possible evolution scenario of the system was also discussed in the context of the mass vs mass ratio diagram.

Bank Capital Adequacy Ratio and Bank Performance in Vietnam: A Simultaneous Equations Framework

  • DAO, Binh Thi Thanh;NGUYEN, Kieu Anh
    • The Journal of Asian Finance, Economics and Business
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    • v.7 no.6
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    • pp.39-46
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    • 2020
  • Playing an important role in developing the economy and overall developments of the country, commercial banks have to be aware of their crucial presence in order to perform well and contribute significantly. At the same time, as a place to receive deposits, banks are required to be in safe situations to avoid bankruptcy or deal with financial crises. This research seeks to identify the determinants of Capital Adequacy Ratio and Banks' performance as well as the relationship between these two dependent variables. The paper uses 128 observations of 16 Vietnamese commercial banks during the period from 2010 to 2017, with two simultaneous dependent variables CAR and ROE, and independent variables including Return on Assets, Tobin Q, Credit growth, GDP growth, Equity to Deposits, Loans to Deposits, Bank size, Cost to Income, Liquidity risk, Provision for Loan loss ratio, Non-performing loans and Inflation. The results reveal that Capital Adequacy Ratio and Banks' Performance have statistically significant relationship and Credit growth, GDP growth, Equity-to-Deposit ratio and Cost-to-Income ratio all have significant effects on two dependent variables. The findings of this study suggest that commercial banks should control the respective elements in order to maintain adequate level of capital and also create effective performance.

Exploring Stock Market Variables and Weighted Market Price Index: The Case of Jordan

  • ALADWAN, Mohammad;ALMAHARMEH, Mohammad;ALSINGLAWI, Omar
    • The Journal of Asian Finance, Economics and Business
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    • v.8 no.3
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    • pp.977-985
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    • 2021
  • The main aim of the study is to provide empirical evidence about the association between stock market exchange data and weighted price index. This research utilized monthly reported data from the Amman stock exchange market (ASE) and the Central Bank of Jordan (CBJ). The weighted price index was employed as the dependent variable and the independent variables were weighted price index (WPI), turnover ratio (TOR), number of trading days (NTD), price-earnings ratio (PER), and dividends yield ratio (DY). The time period of the study was from January 2015 to October 2020. The study's methodology follows a quantitative approach using the multiple regression method to test the hypotheses of the study. The final results of the study provided conclusive evidence that the market-weighted price index is strongly and positively correlated to three predetermined variables, namely; turnover ratio, price-earnings ratio, and dividend yield but no evidence was obtained for the effect of the number of trading days. The finding of the current study proved that the market price index is not only influenced by macro factors, but also by other variables assumed to not beneficial for the judgment of price index movements.

Analysis of Local Tax Performance Through Tax Capacity and Tax Effort in Indonesia 2014-2018

  • RAFSANJANI, Ali Hadi;AGUSTINA, Neli
    • Asian Journal of Business Environment
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    • v.12 no.2
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    • pp.43-53
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    • 2022
  • Purpose: This study aims to analyze the performance of local taxes in Indonesia through the estimation of tax capacity and tax effort, as well as classifying provinces based on the estimated value of tax capacity and tax effort. Research design, data and methodology: this study uses panel data of 34 provinces in Indonesia for the period of 2014-2018. The analytical method used in the tax capacity model is panel data regression to explain the factors that influence tax performance. Tax effort is estimated by the ratio of tax to tax capacity. Results: The results of the analysis show that gini ratio and regional expenditures have a significant positive effect on the tax ratio, while the share of GRDP in the manufacturing sector and HDI has a significant negative effect on the tax ratio. Based on the results, there are 19 provinces that have low tax capacity and 16 provinces that have low tax effort. Conclusions: The development of local tax performance tends to fluctuate with an average of 1.24 percent per year. Gini ratio and regional expenditure have a significant positive effect on the tax ratio, while the share of GRDP in the manufacturing sector and HDI have a significant negative effect on the tax ratio.

Estimating Retirement Consumption Needs Using Target Replacement Rate (목표 소득대체율을 통한 은퇴소비의 추정)

  • 여윤경
    • Journal of the Korean Home Economics Association
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    • v.40 no.3
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    • pp.83-97
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    • 2002
  • This study estimates the consumption needs of preretired households through target replacement ratio approach. Based on the Life Cycle Model, this study used the household expenditure function to derive the target replacement ratio appropriate for each household. The target replacement ratio is estimated using the 1996 National Survey of family Income and Expenditure by National Statistical Office. The estimated target replacement ratio was 82.4% for married couple households, and 85.1% for single households. Total retirement consumption needs during entire retirement period was 161,620,000 won for married couple households, and 50,532,039 won for single households.

Study on the Growth and the Drought Resistance of Amorpha fructicosa under the Control of Water Supply (수분공급조절에 의한 족제비싸리의 생장과 내건성에 관한 연구)

  • Hong, Kyung-Hae;Kim, Woen
    • The Korean Journal of Ecology
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    • v.5 no.2_3
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    • pp.123-131
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    • 1982
  • The growth and the resistance of Amorpha fructicosa L. under water control was experimented in frames out of doors. The plant grew in a wagner's pot under water control. The soil moisture content was controlled at 5%, 10%, 15% and 20%. The growth of leaf, stem and root in the groups of 5% and 10% soil moisture content were different from values in the groups of 15% and 20%. The T/R ratio in the groups of 5% and 10% soil moisture content were different from the ratio in the groups of 15% and 20% soil moisture content. The T/R ratio of former was lower than the latter, but the C/F ratio of the former was higher than the latter. RGR and NAR of Amorpha fructicosa decreased in 5% and 10% soil moisture content but increased in 15% and 20% soil moisture content during growing period. The maximum values of RGR and NAR were respectively 0.089 and 0.080 at 20% soil moisture content. The highest value of LAR was 1.560 at 5% soil moisture content. RGR and NAR were comparatively affected by soil moisture content.

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Variation of NO3-/nss-SO42- Ratio: Measurement Data at Gosan between 1992 and 1999 (비해염 황산염에 대한 질산염의 비로 살펴본 대기오염물질의 변화: 1992~1999년 고산 측정자료)

  • 김용표;박민하;강창희
    • Journal of Korean Society for Atmospheric Environment
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    • v.18 no.3
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    • pp.247-252
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    • 2002
  • In this technical information, the TSP measurement data at Gosan between 1992 and 1999 are presented and analyzed. The average ratio of N $O_3$$^{[-10]}$ /nss-S $O_4$$^{2-}$ is highest in March. The annual average ratio concentration of N $O_3$$^{[-10]}$ increased and it was found that the annual average ratio of N $O_3$$^{[-10]}$ /nss-S $O_4$$^{2-}$ increased during the period, probably due to the change of emission characteristics of China.

Predicting Audit Reports Using Meta-Heuristic Algorithms

  • Valipour, Hashem;Salehi, Fatemeh;Bahrami, Mostafa
    • Journal of Distribution Science
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    • v.11 no.6
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    • pp.13-19
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    • 2013
  • Purpose - This study aims to predict the audit reports of listed companies on the Tehran Stock Exchange by using meta-heuristic algorithms. Research design, data, methodology - This applied research aims to predict auditors reports' using meta-heuristic methods (i.e., neural networks, the ANFIS, and a genetic algorithm). The sample includes all firms listed on the Tehran Stock Exchange. The research covers the seven years between 2005 and 2011. Results - The results show that the ANFIS model using fuzzy clustering and a least-squares back propagation algorithm has the best performance among the tested models, with an error rate of 4% for incorrect predictions and 96% for correct predictions. Conclusion - A decision tree was used with ten independent variables and one dependent variable the less important variables were removed, leaving only those variables with the greatest effect on auditor opinion (i.e., net-profit-to-sales ratio, current ratio, quick ratio, inventory turnover, collection period, and debt coverage ratio).

New Driving Method for High Contrast Ratio and Reduction of Reset Period of AC-PDPs

  • Bae, Jeong-Guk;Kim, Joon-Yub
    • 한국정보디스플레이학회:학술대회논문집
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    • 2005.07b
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    • pp.1187-1190
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    • 2005
  • The ramp reset driving method proposed in [1] has been widely adopted because of its stability and high contrast ratio. However, when the conventional ramp reset method is used in PDPs of higher resolution, the long required time for reset often becomes a problem. In this paper, a new driving method that requires much less reset time and that significantly improves the contrast ratio is introduced. Using this new driving method, the required time for reset could be reduced to 150us from 350us of the conventional ramp reset method, and the contrast ratio is almost infinite because the luminance of the off-cell is almost zero.

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Bilateral Variable-Ratio Chopper System for Electric Motorcar Control (전기자동자 제어를 위한 전류가역쵸퍼 방식)

  • Jung, Yeon-Tack;Han, Kyung-Hee;Kang, Seung-Wook;Lee, Seung-Hwan;Jun, Dae-Hyun
    • Proceedings of the KIEE Conference
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    • 1989.07a
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    • pp.587-590
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    • 1989
  • Bilateral Variable-Ratio chopper system performs Step-down chopper and Step-up chopper operations automatically every operating period of the chopper. The Ratio between Step-down chopper and Step-up chopper operations is determined by a Tine- ratio and the circuit elements. In this paper, we suggest that this chopper system can operate variable speed control of the electric motorcar when it is applied to the electric motorcar.

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