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쌀 가격의 유통단계별 인과성과 비대칭적 가격 전이 검정
박한울 ( Park Han-ul ),김종인 ( Kim Jong-in ),남경수 ( Nam Kyung-soo ) 한국식품유통학회 2021 食品流通硏究 Vol.38 No.4
This study empirically analyzes the asymmetric price transfer of rice under the assumption that the degree of price response in the production stage could be reduced or expanded without being constantly transferred to the wholesale or retail stage due to costs and processing occurring in the distribution process. we first analysis the causality of the wholesale price and retail price of rice, and determine the time lag in which the price of rice is transferred from the wholesale market to the retail market. In addition, we analyze asymmetric price transmission to determine whether the rice distribution market is inefficient. In the result, the time lag is estimated to be about 10 to 30 days. Furthermore, the analysis result shows that there is positive asymmetric price transmission in the wholesale-retail market. This result can be interpreted as a high probability of a retailer's excess profit, meaning that changes in retail prices are more sensitive when wholesale prices increase than when the wholesale prices decreases. These results suggest that improvement of the rice distribution system needs to be approached not only at the production-wholesale stage but also at the retail-wholesale stage. In other words, if an efficient retail price is determined through strengthening monitoring system of retail prices, we can expect that the more efficient distribution structure in rice market.
한,미 FTA 오렌지 관세인하가 국재 주요 과일 가격에 미치는 영향분석
문한필 ( Han Pil Moon ),이현근 ( Hyun Keun Lee ),박한울 ( Han Ul Park ) 한국농업경제학회 2013 農業經濟硏究 Vol.54 No.1
To analyze the impact of the KORUS FTA on the domestic fruit market, this study conducted a consumer survey on the consumption substitution effects of importing oranges on domestic fruits and estimated the impact of lowering tariffs imported oranges on domestic fruit prices using a simultaneous equation based on monthly import statistics during the main orange-importing period. According to the survey results, it was found that 64% of surveyed consumers could feel the drop in orange prices and one quarter of surveyed consumers increased their purchase of oranges while decreasing their consumption of domestic fruits. Domestic fruits, The prices of domestic fruits increased sharply higher than previous years since the KORUS FTA went into effect, and the main cause this big increase in the price was due to the reduction in supply amount resulting from a bad gravest. The lowering of tariffs for oranges, on the other hand, had the erect of limiting the prices of domestic fruits such as mandarin oranges, oriental melons, strawberries, and cherry tomatoes, The tariff reduction of oranges imported from the U.S. had the effect of lowering the price of lowering the price of mandarin oranges by 10.4% and melons, strawberries, and cherry tomatoes by 3~4%.ln response to the tariff reduction for imported oranges, consumers responded to the overall reduction in welfare by increasing their purchase of imported oranges, On the other hand. The domestic fruit growers who harvest and supply their produce during the orange-importing period suffered a welfare reduction compared to previous years as they failed to sufficiently compensate the sharp drop in supply amount with a price increase.
저주파대역 RFID 결제 시스템을 사용하는 숙박시설에 대한 효율적 공격 기법 연구
나동빈(Na Dong-bin),박한울(Park Han-ul),이태일(Lee Tae-ill),이상욱(Lee Sang-wook),강종구(Kang Jong-goo) 한국정보기술학회 2017 Proceedings of KIIT Conference Vol.2017 No.12
EM4100은 저주파대역 RFID(Radio-Frequency Identification) 태그의 한 종류로 찜질방, 호텔, 식당 등 산업 전반에서 편리한 사용자 인증(Authentication)을 제공하기 위한 목적으로 사용된다. 본 논문에서는 EM4100을 사용해 고객들에게 간편 결제 시스템을 제공하는 숙박시설이 가지는 취약점에 대한 연구를 진행하였다. 연구 결과 최근 숙박시설은 실시간 결제 정보 DB 서버를 구축하여 단순히 RFID 태그를 적용한 기존의 시스템보다 보안성이 향상된 결제 서비스를 제공하고 있다. 그럼에도 악의적 공격자가 부당한 금전적 이득을 취할 수 있는 다양한 공격 벡터가 여전히 존재한다. 본 논문은 저주파대역 RFID 결제 시스템을 사용하는 숙박시설의 취약점을 악용한 효율적인 해킹 공격 기법을 소개하고 이를 보완할 수 있는 방안을 제시한다.
윤종열(Jong-Yeol Yoon),박기환(Ki-Hwan Park),박한울(Han-ul Park),이병훈(Byoung-Hoon Lee) 한국농식품정책학회 2021 농업경영정책연구 Vol.48 No.3
The objective of this study is to identify consumers preferences and purchasing behavior and to analyzing purchasing decision factors for major imported fruits such as orange, cherry, grapefruit and avocado. For this purpose, multinomial logit is applied. As a result of the purchase behavior survey, the majority of consumers have a high experience of purchasing imported fruits and a high rate of repurchase. The preference for grapefruit and avocado has improved significantly compared to the past and Imported fruits, which are likely to be replaced by domestic fruits, turned out to be oranges and cherries. According to the analysis of the multinomial logit model, the experience of purchasing imported fruits, the recognition of age and variety, and the educational background variables are analyzed as the main determinants. In order to promote the consumption of domestic fruits, it is necessary to establish a differentiated customized marketing strategy by segmenting fruit types and attributes in consideration of the characteristics of the consumer class, such as age groups and income levels. It is also necessary to explore ways to spread information about various varieties and functionalities of fruits.
전상곤(Jeon Sang Gon),공철(Gong Cheol),김용민(Kim Yong Min),박한울(Park Han Ul) 한국지역개발학회 2012 韓國地域開發學會誌 Vol.24 No.3
This paper analyzes the effects of industrial agglomeration and compares the effects of those focusing on Capital region and Dongnam-Gwon. The growth rage of GRDP of Dongnam-Gwon have slowed and dropped under the national average after 2000``s, because most of industries, especially in the area of information and communication, concentrated in Capital region. The economy of Dongnam-Gwon looks sound superficially but it encounters a deadlock. It needs a middle or long term momentum for its steady-growing economy. To establish policies for enhancing the competitiveness of Dongnam-Gwon, we need to understand what factors affect and how much they contribute to the regional economy. Hence, this study empirically analyzes the effects of industrial agglomeration using the firm level data. Empirical results are summarized as follows. First, the impacts of specialization that is one of the localization economies are statistically significant to the economy of Dongnam-Gwon. Second, the urbanization economies caused by diversities of different industries in one region and the market linkage effects are not observed in the economy of Dongnam-Gwon. Third, however, the economy of Capital region has positive externality effects in the localization economies, the urbanization economies, and the market linkage effects. Fourth, the non-linear regression results show that the marginal impact of specialization in Dongnam-Gwon has decreased with times. Hence, the positive effects can be obtained from further specialization in Dongnam-Gwon irestrictive. Fifth, the economy of Dongnam-Gwon has to be restructured so that the urbanization economies from diversities and the market linkage effects may have positive external impacts on the regional economy. Lastly, the coordination between specializations and diversities is necessary to obtain steady growth in Dongnam-Gwon.