• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.20-20
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• 2018

다년동안 지속되는 가뭄현상이 빈번하게 발생하고 있지만, 우리나라에서는 지금까지 장기 가뭄보다 단기 가뭄에 초점을 맞춰 연구가 진행되어 왔다. 다년 가뭄을 반영하지 않고 댐의 저수용량을 평가할 경우, 저수용량이 과소평가될 수 있기 때문에 다년간의 가뭄을 반영한 시계열 모형을 통해 다양한 시나리오를 생성하고 분석해야 한다. 본 연구에서는 2015년부터 2017년까지 장기 가뭄이 발생한 보령댐의 1998년-2017년까지의 관측 월평균 유입량 자료를 바탕으로 Autoregressive Moving Average(ARMA)시계열 모형과 Hurst Coefficient를 추가하여 장기지속성을 반영하도록 개발된 시계열 모형인 Autoregressive Fractionally Integreated Moving Average(ARFIMA)를 사용하여 보령댐 500년 기간의 유입량 자료를 생성하였다. Hurst Coefficient는 Hurst가 제안한 Rescaled Range(R/S)방법 외에도 경험식, 이론식을 모두 사용하여 산정하였다. 생성된 자료가 관측 자료의 장기지속성을 잘 반영하는지에 대한 검증을 위해 관측자료의 누적유입량으로부터 선형 이동평균방법을 사용하여 가뭄기준을 산정하고, 생성한 유입량 자료가 장기가뭄을 반영하고 있는지 판단하였다. 그 결과 가뭄의 장기지속성을 잘 반영하는 시계열 모형을 선정하였으며, 향후 연구를 통해 미래 기후변화 시나리오를 반영한 장기가뭄 분석을 수행할 예정이다.

• Journal of the Korea Society of Computer and Information
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• v.19 no.2
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• pp.221-231
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• 2014

TIn this paper, The need for a long-term sustainable Green IT strategy to pursue strategic partnerships and alliance was proposed. We made a research model to identify how social pressure, environmental orientation and environmental attractiveness affect into the Green IT strategy, and how Green IT strategy affects on Green IT company's environmental performance. In previous studies, the long-term persistence was used as the dependent variables, but in this paper it was used as a parameter variable. A survey of Green IT companies and a empirical analysis by statistical software package were conducted. It was verified that the mediating effect is between the social pressure, environmental orientation, environmental attractiveness and environmental performance by the long-term persistence.

• The Korean Journal of Applied Statistics
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• v.27 no.2
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• pp.291-305
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• 2014

Persistence is one of the typical characteristics appearing in the volatility of financial time series. According to the recent researches, the volatility persistence may be due to either volatility shifts or long-range dependence. In this paper, we consider residual-based CUSUM tests to distinguish volatility persistence, long-range dependence and volatility shifts in GARCH models. It is observed that this test procedure achieve reasonable powers without a size distortion. Moreover, we employ AIC and BIC criteria to estimate the change points and the number of change points in volatility. We demonstrate the superiority of residual-based CUSUM tests on various Monte Carlo simulations and empirical data analysis.

• Journal of the Korean Geographical Society
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• v.45 no.6
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• pp.748-765
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• 2010

This study aims to investigate the difference of synoptic characteristics over East Asia according to the persistence of rainfall in Korea during the Changma season (June and July). In the cases of consecutive rainfall which lasts four or more days, there are developed ridges in 850hPa level east of the Korean peninsula which introduce stagnation of the synoptic cyclone over Korea. An cold area in 850hPa level moves southward from the Northern China in one day before the beginning the rainfall day in Korea and it aids the development of the stationary front in East Asia. When rainfall lasts a day or two, cyclones pass over Korea in rainy day and the stationary front in East Asia is not intensified. In both cases the synoptic cyclones near the Korean peninsula shows a deep-baroclinic structure, while in the former cases over the southwestern part of Japan a subtropical frontal zone which has a shallow structure appears near Japan. In latter cases the frontal structures are same near Korea and Japan. So, this means that the Changma is not necessarily similar to the Baiu of Japan in all cases.

• Culinary science and hospitality research
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• v.22 no.5
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• pp.325-338
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• 2016

This research aimed to setup the innovativeness, dependability of information, reliability, and sufficiency of information of a mobile eating out application as the precedence factor, and also aimed to present useful information regarding the mobile eating out application by verifying the effect on the continuous use satisfaction levels and long-term orientation for this mobile eating out application. The data collection carried out from February 1 to February 28, 2016, with 441 questionnaires collected from a total distribution of 500 copies, of which 396 were retained. SPSS 22.0 was employed for factor analysis and the reliability verification, while AMOS 22.0 was used for the covariance structure analysis meant to verify the presented research hypothesis. The results are as follows. First, there was found a significant positive effect (+) on continuous use from innovativeness and dependability. On the other hand, sufficiency and reliability appeared not to have a significant effect. Second, there was a positive increase in long-term orientation as continuous use increased. Third, long-term orientation increased in relation to innovativeness. On the other hand, sufficiency, dependability and reliability appeared not to have a significant effect on long term orientation. Accordingly, the useful implications for the eating out application based on the analysis results has been presented.

• 주택과사람들
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• s.202
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• pp.30-31
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• 2007

정부가 지난 1월 31일 부동산 대책을 또 내놨다. 장기 임대 주택을 지속적으로 확대 공급하겠다는 게 골자다. 또한 새롭게 펀드형 임대주택이라는 방식까지 제안하고 있다. 임대 주택의 실효성 여부와 이것이 주택 시장 전반에 미치는 영향에 대해 알아보자.

• Bulletin of Korea Environmental Preservation Association
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• s.411
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• pp.4-7
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• 2014

환경부에서는 지난 3월 제3차 국가 생물다양성 전략을 수립하였다. 2050년까지 "생물다양성을 풍부하게 보전하여 지속가능하게 이용할 수 있는 대한민국을 구현"하는 장기 비전과, 2020년까지 "생물다양성 보전과 생태가치 제고를 통한 창조경제 견인"하는 중기 비전을 정하고, 이를 달성하기 위하여 6대 전략과 18개 실천목표를 마련하였다.

• Cartoon and Animation Studies
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• s.18
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• pp.89-101
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• 2010

This paper examined the effect of long-term ad campaign for building of brand identity and the relationship between brand identity as a viewpoint of a company and brand image in a viewpoint of consumers. As a result, it was revealed that advertising played an important role to make brand identity. In specific, a long-term ad campaign with a consistent concept and message was more effective for consumers to imbue clear and differential brand traits. In addition, it is discovered that the consistency and durability of advertising message for the advertised brand are contributed to consumers' positive attitude toward the brand. This result was revealed from the comparison of print advertisements for two brands-'Chamisul fresh' and 'Chumchurum', which are alcoholic brands on an intense competition in the same soju market in Korea. While Chumchurum has been consistently focused on one core trait for the brand, Chamisul fresh has been concentrated on multiple brand traits in the advertising campaign for four years since the brand had been launched.

• The Journal of the Korea Contents Association
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• v.22 no.2
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• pp.270-280
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• 2022

There has been a stream of literature studying moderators of the relationship between organizational ambidexterity and firm performance, but there remains a lack of research on moderators with a strategic perspective. We examined the effect of organizational ambidexterity on a firm's long-term performance and the moderating effect of a firm's relative exploration and exploitation based on a sample of 8,916 firms. We found a positive relationship between organizational ambidexterity and long-term performance measured by Tobin's q. The results also suggest that a firm's relative exploration positively moderates the relationship between organizational ambidexterity and long-term performance, whereas exploitation negatively moderates this relationship. We contribute to the current ambidexterity literature by integrating it with strategy literature. We found that the positive relationship between organizational ambidexterity and long-term performance is enlarged and long-lasting when a firm is a differentiator. In contrast, this positive relationship is lessened and short-lasting when a firm is a cost-leader.

• Electronics and Telecommunications Trends
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• v.14 no.6 s.60
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• pp.183-193
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• 1999

통신사업에 경쟁체제가 성숙되어감에 따라 보다 합리적인 접속료 산정방식에 대한 검토가 이루어지고 있는 바, 최근에는 경제적 효율성을 반영한 접속료 산정방식으로서 장기증분비용 방식의 도입에 대한 논의가 활발히 이루어지고 있다. 본 고에서는 대표적인 장기증분비용 모형인 미국의 Hatfield 모형과 BCPM에 대해 비교 분석하고 우리나라에의 시사점을 살펴본다. 이 모형들은 기본적으로 bottom-up 방식을 토대로 장기증분비용을 산정하며 현실 적용성을 높이기 위해 지속적으로 모형을 개선해 오고 있다.