• 유통과학연구
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• 제12권5호
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• pp.71-80
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• 2014

Purpose - The object of this paper is to ascertain how Japan has become a powerful trader in the international grain market. A case in point is the world's third largest U.S. major grain trader, Gavilon, merged with general trading company Marubeni in 2012. What are Japan's strategies and their implications? Research design, data, and methodology - The study analyzed Japanese Ministry of Agriculture, Forestry, and Fisheries data, and data from daily and weekly papers. The paper employed various data and research methodologies. Results - The Lee Myeong-Bak government tried for three years to create a company similar to Cargill, but the project eventually failed. On the other hand, Japan has emerged as a leader in the international grain distribution market for the past 50 years, with the cooperation of government and private companies. Conclusion - The findings of this study show that Korea, China, India, and other countries' international major grain companies now compete to be powerful, major grain traders. South Korea could be the leader of the international grain market through the development of a more careful and long-term strategy.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 A
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• pp.550-552
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• 2001

The vertically integrated power industry was divided into six generation companies and one market operator, where electricity trading was launched at power exchange. In this environment, the profits of each generation companies are guaranteed according to utilization of their own generation equipments. Especially, the electricity demand shows seasonal and weekly regular pattern, which the some capacity should be provided into ancillary service based on the past demand forecasting error and operating results of electricity market. Namely, if generation cost function is applied to SMP and BLMP as announced the previous day, the available generation capacity of the following day could be optimally distributed, and therefore contract capacity of ancillary service applied to CBP(Cost Based Pool) and TWBP(Two-Way Bidding Pool) is determined. Consequently, it is Possible to use the retained equipments optimally. This paper represents on efficient bidding strategies for generation equipments through the calculation of the contract and the application of each generator cost function based on the past demand forecasting error and market operating data.

• 문화경제연구
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• 제20권1호
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• pp.105-128
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• 2017

본 논문은 한국 영화시장을 중심으로 '흥행의 스크린 탄력성'을 배급사 그룹별로 비교하고, 이를 통해 영화의 상영 스크린 배분에 있어서 배급사간 유의한 차이가 있는지를 실증적으로 파악하고자 한다. 2014~2015년 동안 한국 영화시장에서 개봉한 전국관객 수 100만 명 이상의 흥행영화 94편의 주차별(weekly) 흥행 성적 및 스크린 수 등의 자료를 사용하여 패널분석을 실시하였고, 추정에는 설명변수의 내생성을 고려한 하우스만-테일러 추정량을 사용하였다. 분석결과, 헐리우드 직배사(워너브라더스 등), 수직결합 배급사(CJ E&M, 롯데엔터테인먼트), 비수직결합 국내 배급사(쇼박스, NEW)순으로 영화의 스크린 탄력성이 작게 나타났다. 이는 직배사와 수직결합 배급사 영화의 경우 상대적으로 관객 수 대비 더 많은 스크린에서 상영됨을 의미한다. 분석 기간 동안 배급사의 흥행성과가 헐리우드 직배사, 수직결합 배급사, 비수직결합 국내 배급사 순으로 높았다는 점을 고려할 때 이러한 결과는 배급사의 흥행 스크린 탄력성이 흥행성과로 표현되는 배급사의 시장성과와 관련 있음을 시사한다. 즉, 전반적인 시장성과가 좋은 배급사 영화일수록 관객 수 대비 더 많은 스크린에서 상영될 가능성이 높아진다. 수직결합 배급사의 경우, 스크린 탄력성이 더 작게 나타나는 배경이 계열 극장을 가지고 있다는 조직적 특성 보다는 시장성과가 비수직결합 배급사에 비해 더 좋았다는 점과 관련 있을 가능성이 있다.

• 디지털융복합연구
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• 제13권8호
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• pp.153-160
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• 2015

국내 주식시장은 1997년 9월 외환위기 이후 커다란 변화를 겪게 되었다. 외환위기 이후 국내 금융시장이 개방되면서 해외자본이 주식시장과 채권시장, 외환시장으로 들어왔다 나가기를 반복하고 있다. 국내 주식시장은 외환위기 이전에는 대부분 국내 자본에 의해 영향을 받아왔다. 그러나 외환위기 이후에는 해외자본에 의해 절대적인 영향을 받아오고 있다. 본 연구의 목적은 두 구간의 동향을 살펴보고 외환위기 이후 종합주가지수의 변동성에 어떠한 변화가 나타나고 있는지 분석하는데 있다. 이를 위해 본 연구는 두 구간의 차이를 살펴보고자 일간과 주간, 월간의 정규분포와 첨도, 왜도를 구하여 두 구간의 변동성과 기울임 현상을 분석하고자 한다. 이를 바탕으로 향후 국내 주식시장의 움직임도 예측하고자 한다. 분석 결과 외환위기 이후 등락폭은 감소하였으나 중장기적으로 종합주가지수의 방향성은 상대적으로 뚜렷하게 나타나고 있다. 이를 근거로 향후 국내시장은 방향성을 보면서 중장기적인 투자가 바람직해 보인다.

• Communications for Statistical Applications and Methods
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• 제23권3호
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• pp.203-213
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• 2016

We investigate volatility spillover aspects of realized volatilities (RVs) for the log returns of the Korea Composite Stock Price Index (KOSPI) and the Hang Seng Index (HSI) from 2009-2013. For all RVs, significant long memories and asymmetries are identified. For a model selection, we consider three commonly used time series models as well as three models that incorporate long memory and asymmetry. Taking into account of goodness-of-fit and forecasting ability, Leverage heteroskedastic autoregressive realized volatility (LHAR) model is selected for the given data. The LHAR model finds significant decompositions of the spillover effect from the HSI to the KOSPI into moderate negative daily spillover, positive weekly spillover and positive monthly spillover, and from the KOSPI to the HSI into substantial negative weekly spillover and positive monthly spillover. An interesting result from the analysis is that the daily volatility spillover from the HSI to the KOSPI is significant versus the insignificant daily volatility spillover of the KOSPI to HSI. The daily volatility in Hong Kong affects next day volatility in Korea but the daily volatility in Korea does not affect next day volatility in Hong Kong.

• 수산경영론집
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• 제41권1호
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• pp.73-91
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• 2010

The objective of this study is to examine the hedging effectiveness of shrimp futures market. Hedging effectiveness is measured by OLS model based on rolling windows. Analysis data are obtained from Kansai Commodities Exchange in Osaka and are weekly data of frozen shrimp futures and cash prices in the time period from July 9, 2003, to May 9, 2007. The empirical results are summarized as follows:First, the correlation coefficients between the nearby futures price changes and the cash(16/20) price changes are very low and have range from 0.141 to 0.208 values. Second, the minimum variance hedge ratios($\hat{\beta}$) are all statistically different from 0 at the 5% level and range from 0.0477 to 0.5039 values excluding Indian shrimps(26/30). Ex post hedging effectiveness, as measured by the coefficient of determination, $R^2$, is relatively very low and range from a low of 0.4% for west-south Indian shrimps(26/30) to a high 4.3% for Vietnamese shrimps(16/20). Third, ex ante hedging effectiveness, as measured by out-of-sample hedging period, is also very low and range from a low of -4.4% for west-south Indian shrimps(21/25) to a high of 3.4% for Vietnamese shrimps(16/20). This indicates that the shrimp futures market doesn't behave as risk management instrument of shrimp spot.

• Asian-Australasian Journal of Animal Sciences
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• 제18권4호
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• pp.557-561
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• 2005

The present study was undertaken to investigate the effects of weekly administration of implant type recombinant porcine somatotropin (rpST) on the performance and carcass characteristics in finishing pigs. A total of 120 crossbred (Landrace${\times}$Yorkshire${\times}$Duroc) pigs were employed for 11 weeks in a growth trial in experiment. A rpST designed to implant every 7 d was used. Forty pigs, each weighing 75 kg, were allocated into three rpST treatments; control (CONT), implant of rpST from 75 kg (TRT1) or 90 kg (TRT2) of body weight. The CONT pig and pigs in TRT2 from 75 kg to 90 kg were treated without rpST but with placebo. In rpST-treated pigs, each 100 mg and 125 mg of the equivalent rpST was implanted from live weight of 75 kg to 90 kg and from 90 kg to market weight, respectively. Half of the pigs from each treatment were marketed at live weight of 110 kg and the rest at 130 kg. All pigs were allowed ad libitum access to a commercial feed containing 0.94% and 0.88% of lysine from 75 to 110 kg, 110 to 130 kg of body weights, respectively. rpST had no effect on daily gain, while feed efficiency was improved by 7 to 13% (p<0.05) in the rpST-treated groups compared with the CONT. Compared with the CONT, backfat thickness was decreased by 12% (p<0.05) in TRT1 at 110 kg of market weight, and by 23 to 32% (p<0.05) in the rpST-treated groups at 130 kg of market weight, respectively. Lean muscle rate tended to be higher in TRT1 at both 110 kg and 130 kg of market weight, and carcass fat percentage in the rpST-treated groups was decreased by 33 to 46% (p<0.05) compared with the CONT.

• 한국콘텐츠학회논문지
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• 제15권6호
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• pp.157-167
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• 2015

본 연구는 신한류를 주도하고 있는 아이돌 음악의 대중화가 한국대중음악시장의 생태계 균형에 어떠한 영향을 주었는지를 연구하였다. 이는 많은 언론들이 아이돌 음악의 대중화로 인해 전체시장이 불균형을 이루고 있다는 보도에 문제를 제기하기 위함이다. 연구방법은 페터슨의 문화생산론을 차용하였고 분석대상은 국내 디지털 음원유통 1위인 멜론 가요음악차트의 2000-2014년 주간 Top10을 사용하여 이중 차트에 진입한 아이돌 음악만을 선별하여 양적연구를 하였다. 연구결과 아이돌 음악은 한국대중음악시장의 생태계 구성에 불균형을 초래하지는 않았으며, 오히려 다양한 음악 스타일을 선보이며 음악시장의 장르 다양성에 기여하고 있음을 발견하였다. 이러한 올바르지 않은 정보로 신한류를 주도하고 있는 아이돌 음악의 생산이 위축되어서는 안 될 것이며, 향후 정부 관련기관은 검증된 사실에 입각하여 정책을 수립하여야 할 것이다. 이것은 한류의 지속가능성과 확대 재생산을 위한 중요한 문제로 다루어져야 하기 때문이다.

• 유통과학연구
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• 제15권9호
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• pp.85-93
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• 2017

Purpose - The volume and valence of online word-of-mouth(eWOM) have become an important part of the retailer's market success for a wide range of products. This study aims to investigate how the growth of eWOM has generated the product's final financial outcomes in the introductory period influences. Research design, data, and methodology - This study uses weekly box office performance for 117 movies released in the South Korea from July 2015 to June 2016 using Korean Film Council(KOFIC) database. 292,371 posted online review messages were collected from NAVER movie review bulletin board. Using regression analysis, we test whether eWOM incurred during the opening week is valuable to explain the last of box office performance. Three major eWOM metrics were considered after controlling for the major distributional factors. Results - Results support that major eWOM variables play a significant role in box-office outcome prediction. Especially, the growth rate of the positive eWOM volume has a significant effect on the growth potential in sales. Conclusions - The findings highlight that the speed of eWOM growth has an informational value to understand the market reaction to a new product beyond valence and volume. Movie distributors need to take positive online eWOM growth into account to make optimal screen allocation decisions after release.

• Korean Journal of Mathematics
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• 제22권3호
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• pp.529-552
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• 2014

As we know, some indices and data are strong influence to the price movement of some assets now, but not to another assets and in future. Thus we define some asset models for several time intervals; intraday, weekly, monthly, and yearly asset models. We define these asset models by using Brownian motion with volatility and Poisson process, and several deterministic functions(index function, twitter data function and big-jump simple function etc). In our asset models, these deterministic functions are the positive or negative levels of auxiliary indices, of analyzed data, and for imminent and extreme state(for example, financial shock or the highest popularity in the market). These functions determined by indices, twitter data and shocking news are a kind of one of speciality of our asset models. For reasonableness of our asset models, we introduce several real data, figurers and tables, and simulations. Perhaps from our asset models, for short-term or long-term investment, we can classify and reference many kinds of usual auxiliary indices, information and data.