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대형마트 의무휴업일 평일전환에 따른 영세소매업 폐점률 영향 분석
유병국,김순홍 한국물류학회 2025 물류학회지 Vol.35 No.1
최근 대구시는 전국 최초로 대형마트 의무휴업일을 일요일에서 월요일로 평일 전환하였다. 본 연구는 대구시의 의무휴업일 변경이 관내 영세소매업의 폐업률에 주는 영향을 살펴보기 위하여 의무휴업일 변경전후의 폐업률을 서울시와 비교하는 이분차분분석을 사용하였다. 세부업종별 분석결과 대형마트 의무휴업일 평일변경으로 대구시의 음/식료품소매와 영세종합소매업종의 폐업률이 변경 전에 비해 약 8.8% 증가한 것으로 나타났다. 또 음/식료품소매업종으로 한정할 경우에도 폐업률의 증가치가 6.6%로 나타났으며 중대형종합소매업을 포함한 분석에서는 폐업률의 증가가 양의 값으로 나타났지만 통계적으로 유의하지 않았다. 이 같은결과는 대형마트 의무휴업일의 평일전환이 소매업 중에서도 중대형업체보다는 음/식료품소매 및 영세종합소매 등 영세소매업체의 폐업에 뚜렷한 영향을 미칠 수 있음을 말해준다. 또 최근처럼 전반적인 내수부진이 지속되는 상황에서 영세소매업체는 더욱한계상황에 처할 가능성이 높으며 이 경우대형마트의 입점에 대한 영향뿐만 아니라 의무휴업일의 평일전환 등 영업규제에 대한영향을 평가할 때 매출액이외에 창업/폐업 등의 자료가 좀 더 적절하게 사용될 필요가 있음을 시사한다.
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기계학습기법을 활용한 소비자의 소매유형 선택 연구: 대형마트와 전통시장을 중심으로
유병국,최규영,김대관 한국상업교육학회 2018 상업교육연구 Vol.32 No.1
As competition is getting fiercer between retail formats, the strategy to prevent shoppers from churning is very important in terms of shopper relationship management. Therefore, it is necessary to develop a predictive model to consider not only retail format choice (i.e., national chains or traditional market) but also the possibility of cross-shopping derived from the partial churn. In order to predict retail format choice and degree of cross shopping, the current study used logistic regression analysis, decision tree, random forest, GBM, neural network models, which can be simultaneously used for classification model and regression model. In order for the degree of cross-shopping, the visits to the favorite retail format for each shopper and the visits to the alternative store format were used as dependent variables. The ensemble method such as random forest and boosting were the most superior model in predicting the retail format choice. Through the appropriate use of machine learning method, superior prediction is possible from the retail format choice for each shopper to the degree of the cross shopping, affecting more effective customer relationship management (CRM).
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An Integration Type Adaptive Compensator for a Class of Linearly Parameterized Systems
유병국,양근호,Yoo Byung-Kook,Yang Keun-Ho The Korea Institute of Convergence Signal Processi 2005 융합신호처리학회 논문지 (JISPS) Vol.6 No.2
A compensation scheme for a class of linearly parameterized systems is presented. The compensator consists of a typical linearizing control and an adaptive observer with integration type update law, which is based on Speed Gradient (SG) algorithm.. Instead of the intermediate functions of the compensation schemes suggested by other researchers, the proposed compensator is designed with some design functions which guarantee the growth, convexity, attainability, and pseudo gradient conditions in the update law. The scheme achieves the asymptotic stability of the tracking error and the boundedness of the estimation errors. A numerical example is given to demonstrate the validity of the proposed design.
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유병국,이재희,신선주,황을원,권혁빈 한국식물학회 2013 Journal of Plant Biology Vol.56 No.2
EREBP (ethylene responsive element binding protein) and WRKY (wizz-like transcription factor) are known to play roles in plant tolerance to abiotic stresses, such as low temperatures. Previously, we used cDNA microarrays and Northern blot analysis to determine the mechanisms responsible for those underlying defenses. These analyses led to the identification of CaEREBP-C1, -C2, -C3 and CaWRKY1A genes that encode the ethylene responsive element binding protein and wizz-like transcription factors, respectively, from hot pepper (Capsicum annuum). In that study, we demonstrated that the CaEREBP-C1, -C2, -C3 and CaWRKY1A genes were strongly induced by cold stress. Here, we used Tiplasmid and Agrobecterium-mediated transformation to engineer CaEREBP-C1, -C2, -C3 and CaWRKY1A under control of the CaMV 35S promoter for constitutive expression in transgenic plants. The resultant transgenic plants exhibited significantly increased tolerance to low temperatures. In addition, none of the CaEREBP-C1, -C2, -C3 and CaWRKY1A transgenic plants showed visible phenotypic alteration when compared to wild type plants. Taken together, these results suggest that CaEREBP-C1, -C2, -C3 and CaWRKY1A play important biological roles in conferring plant cold stress tolerance.
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연중독치료시 혈중연, 뇨중연, 뇨중 Coproporphrin, 뇨중 ${\delta}$-Aminolevulinic acid의 변화
유병국,Yoo, Byoung-Kook 대한예방의학회 1978 Journal of Preventive Medicine and Public Health Vol.11 No.1
In order to study the change of laboratory parameters of lead poisoning, 8 persona who had not been treated previously for lead poisoning (Group 1 and 6 persons who had been inadequately treated for few months for chronic lead poisoning at local clinic (Group 2) were examined. They had occupational exposure to lead for 3 to 18 years (mean, 7.6). In group 1 blood lead, urine lead, urine coproporphyrin and ${\delta}$-aminolevulinic acid levels before our treatment exceeded the critical levels of lead poisoning. In group 2 urine lead level exceeded but blood lead, urine coproporphyrin and ${\delta}$-aminolevulinic acid levels were within normal limits. All of them were treated with D-penicillamine for 4 months as inpatients at Industrial Accident Hospital. The dose of D-penicillamine was the same in all patients; 600 mg per day p.o. and the chelating agent was administer every other week. For laboratory analysis, 24 hour urine and 10 gm of whole blood were collected every 1 month on last day of non-administration period. The results were as follows: 1. It was found that urine lead level was decreased below the cirtical level of lead poisoning after 4 month's treatment with D-penicillamine and blood lead level was decreased more progressively below the critical level after 1 month treatment. 2. Urine coproporphyrin and ${\delta}$-aminolevulinic acid levels were decreased progressively to normal range after 1 month treatment. 3. Two months after treatment, blood lead, urine lead, urine coproporphyrin and ${\delta}$-aminolevulinic acid levels showed some increasing trends. 4. Urine lead level should be checked in a person who had been inadequately treated with chelating agents because blood lead, coproporphyrin and ${\delta}$-aminolevulinic acid might be in normal range.
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