• 산업융합연구
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• 제7권1호
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• pp.63-82
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• 2009

Many The purpose of this paper is to revisit the existence of monthly effect in the Korea Stock Market. We conducted additory test about KOSPI200 from January 1990 to December 2002 and about KOSDAQ from January 2002 to December 2006. The other main focus is examine Size Effect in Korean Stock Market. We also indicate Information hypothesis throught our findig. Data used in this paper are monthly returns of KOSPI and KOSDAQ from 1980 to 2006. As a result, Evidence is provided that monthly abnormal returns in January have large means relative to the remaining eleven months. The relation between abnormal returns and size is always negative and more pronounced in January than in any other month-even in years. More than fifty percent of the January premium is attributable to large abnormal returns during the first week of trading in the year particularly on the first trading day. This finding is highly significant in the mall sized capital stock of KOSPI market. We found January effect and Size Effect in the KOSPI market, but we didn't find January effect and Size Effect in the KOSDAQ market and KOSPI200.

• 한국콘텐츠학회논문지
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• 제17권3호
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• pp.578-588
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• 2017

본 연구에서는 IMF 금융위기 전후 국내 주식시장의 1월효과 여부 및 효율성 상태에 대해 실증하는 한편, 연구결과에 따른 제언을 하고자 한다. 연구목적을 수행하기 위해 국내 주식시장을 IMF 금융위기를 전후로 2개 구간으로 설정하는 한편, KIS-VALUE에서 제공하는 보통주 시가총액을 지표로 월별 증감률을 계산하여 연구에 활용하였다. 본 연구의 주요결과로써, IMF 금융위기 이전인 KOSPI 1구간에서 1월효과 및 소형주 중심의 규모효과가 확인된 반면, IMF 금융위기 이후인 KOSPI $2-{\alpha}$ 및 ${\beta}$구간에서는 1월효과를 확인할 수 없었다. 또한 1월효과가 확인된 KOSPI 1구간은 시계열 분석 등을 통해 비효율적 시장상태를 실증하였지만, 1월효과가 관측되지 않은 KOSPI 2(${\alpha}$ & ${\beta}$)구간에서는 약형 효율적 시장상태를 검증하였다. 이러한 연구결과를 토대로 시사점을 제시하는 한편, 본 연구가 갖는 한계점을 제시하였다.

• 한국콘텐츠학회논문지
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• 제15권8호
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• pp.460-472
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• 2015

본 연구의 목적은 가나증권거래소 종합지수를 바탕으로 가나 증권 시장에서 주말 효과 및 1월 효과가 나타나고 있는지를 분석하고자 하는 것이다. 이를 위해 가나 증권시장에 상장된 기업을 대상으로 2005년 1월 4 일부터 2013년 12월 31일까지 9년간의 일별종가와 종합지수를 나타내는 ASI 및 CI를 토대로 회귀분석을 이용하여 두 효과를 검증하였다. 회귀분석 결과에 따르면 가나 증권 시장에서는 주말효과가 나타나지 않아 선행 연구 결과와 다르게 나타났으며 이는 연구기간과 연구 자료가 다르기 때문인 것으로 사료된다. 월간효과의 회귀 분석 결과, ASI가 사용된 2005년부터 2010년까지 6년의 기간 전체를 대상으로 분석한 결과 4월 효과가 나타났으며, ASI가 사용된 기간을 3년을 기준으로 두 개의 기간으로 구분하여 분석한 결과 2005년부터 2007년까지의 기간은 4월 효과가 보이지 않지만 2008년부터 2010년까지 기간의 경우에는 4월 효과가 나타났다. CI가 사용된 2011년부터 2013년까지 기간의 경우에는 1월 효과가 존재하는 것으로 나타났다.

• The Journal of Asian Finance, Economics and Business
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• 제8권2호
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• pp.711-724
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• 2021

The purpose of this paper is to investigate the profitability of the momentum effects on the Oman Stock Market (OSM). This study uses the monthly returns of all stocks listed on the OSM, with a total of 107 companies used in the study for the period from 2005 to 2018. According to the methodology developed by Jegadeesh and Titman (1993), this study builds momentum portfolios based on various sizes. Moreover, the January effect is also examined to recognize if this effect is related to the momentum effect. The results find that there is evidence of momentum returns and these returns are statistically and economically significant. The sub-periods confirmed the profitability of the momentum strategy. This paper shows that momentum returns are evident at different sizes; big, medium, and small-sized portfolios. Besides, the result shows that the classic January effect does not play an important role in the momentum returns. Thus, the implication is that the momentum should not take into account the annual, seasonal, and size returns. The capital asset pricing model (CAPM) or the three-factor model cannot explain momentum returns generated by individual stocks in the Oman Stock Market. These results are useful to academia and investors alike.

• 재무관리논총
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• 제2권1호
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• pp.127-144
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• 1995

Previous literature in financial economics documents the existence of a liquidity premium in expected returns, measured by the bid-ask spread. This study provides a more comprehensive test of the egect of liquidity on common stock returns by including trading volume as an additional liquidity measure. we find that trading volume is a relevant measure of liquidity, and affects expected returns even aher controlling for the effects of systematic risk, firm size, and the relative bid-ask spread. We also find that trading volume complements the bid-ask spread as a liquidity measure, and provides additional information about the liquidity premium. The liquidity effect emerges in non-January months as a volume effect, in addition to the spread effect in January documented by Eleswarapu and Reinganum(1993).

• Asian Journal of Atmospheric Environment
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• 제10권1호
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• pp.32-41
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• 2016

Particle-phase concentrations were measured at 10, 80, and 200 m from the roadside of a national highway near Seoul in January and May 2008. The highway has two lanes each way, with an average hourly traffic volume of 1,070 vehicles. In January 2008, $PM_{10}$ concentrations decreased from 10 to 80 m but increased at 200 m. Black carbon (BC) decreased only slightly with distance due to the influence of biomass burning and open burning from the surrounding areas. In May 2008, the effect of secondary formation on both $PM_{10}$ and $PM_{2.5}$ was significant due to high temperatures compared with January. Because on-road emissions had little effect on secondary formation for a short time, variations in $PM_{10}$ concentrations became smaller, and $PM_{2.5}$ concentrations increased with distance. The effects of fugitive dust on PM concentrations were greater in May than in January when the mean temperature was below freezing. In the composition variations, the amounts of primary ions, organic carbon (OC), and BC were larger in January, while those of secondary ions and others were larger in $PM_{10}$, as well as $PM_{2.5}$ in May.

• 대한간호학회지
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• 제46권4호
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• pp.534-541
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• 2016

Purpose: The aim of this study was to identify the effect of an observation window (OW) at peripheral intravenous (IV) catheter sites on early detection of IV infiltration among hospitalized children. Methods: This was a retrospective observational study with history control group design. Participants were children who had IV infiltration after peripheral catheterization when hospitalized from January to May, 2014 and January to May, 2015 at a children's hospital located in Yangsan city, Korea. The 193 patients, who were hospitalized from January to May, 2014 formed the control group and did not have OW, and the 167 patients, who were hospitalized from January to May, 2015 formed the window group and had OW. Data were analyzed using ${\chi}^2$-test, independent samples t-test and multiple logistic regression. Results: First stage IV infiltration was 39.5% for the window group and 25.9% for the control group, which was significantly different (p=.007). The likelihood of $2^{nd}$ stage and above IV infiltration decreased by 44% in the window group, which was significantly different (p=.014). Conclusion: OW at the peripheral IV catheter site was found to be an effective measure in early recognition of IV infiltration. Considering the effect of OW, we recommend that nurses should make an OW with transparent dressing during stabilization of the IV catheter site in hospitalized children in clinical settings.

• International journal of advanced smart convergence
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• 제11권2호
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• pp.30-37
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• 2022

Because fine dust (PM10) has a close effect on the environment, fine dust generated in the climate and living environment has a bad effect on the human body. In this study, the LSTM model was applied to predict and analyze the effect of fine dust on Gwangju Metropolitan City in Korea. This paper uses prediction values of input variables selected through correlation analysis to confirm fine dust prediction performance. In this paper, data from the Gwangju Metropolitan City area were collected to measure fine dust. The collection period is one year's worth of data was used from january to December of 2021, and the test data was conducted using three-month data from January to March of 2022. As a result of this study, in the as a result of predicting fine dust (PH10) and ultrafine dust (PH2.5) using the LSTM model, the RMSE was 4.61 and the test result value was as low as 4.37. This reason is judged to be the result of the contents of the one-year sample.

• 한국치위생학회지
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• 제22권4호
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• pp.259-272
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• 2022

Objectives: To identify the factors influencing the turnover intention of registered South Korean dental hygienists and analyze the effect sizes. Methods: Overall, 54 studies based on criteria of PICO from 1 January 2000 to 11 January 2022 were extracted. The factors related to turnover intention were applied to the ecological system theory and categorized. Subsequently, the effect size of the correlations was comprehensively meta-analyzed by dividing it into protective and risk factors depending on the negative or positive correlation direction. Results: For the overall effect size, the protective factor (ES_r=-0.458) was higher than the risk factor (ES_r=0.352). In the protective factors, organizational commitment and perceived organizational support belonging to the microsystem yielded the largest effect size. Furthermore, as for risk factors, burnout, job stress, work harassment, role conflict, and emotional labor belonging to the microsystem showed a moderate effect size. Conclusions: Factors belonging to the microsystem demonstrated a large effect size in both protection and risk factors for dental hygienists' turnover intention. Additionally, the factor showing the largest effect size was protective factor categorized into a microsystem.

• 한국조리학회지
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• 제24권3호
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• pp.204-214
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• 2018

The study set up research models and hypotheses to examine the influence of HMR selection attributes on satisfaction and repurchase intention by distribution channels(convenience store/large market), verify the research hypothesis through empirical analysis, respectively. The purpose of this study is to investigate the convenience sampling method of HMR purchase from convenience store and large market in Seoul and Gyeonggi area. The survey was conducted from January 8, 2018 to January 26, 2018, and 300 questionnaires were distributed and 289 of them were used as an effective data. For the empirical analysis, SPSS 20.0 was used. The results of the analysis are as follows. First, product quality only has a significant effect on satisfaction among HMR selection attributes at convenience store, and product safety and convenience have no significant effect on satisfaction. Second, only the convenience of HMR selection attributes in the large market has a significant effect on satisfaction, and product safety and product quality have no significant effect on satisfaction. Third, HMR satisfaction in convenience stores and large markets has a significant effect on repurchase intention. The purpose of this study is to investigate the relationships among HMR selection attributes, satisfaction, and repurchase intention, which are important in the existing HMR research, by each distribution channel(convenience store/large market). It is meaningful to help them establish an effective sales strategy for each segment.