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유병국,김순홍 한국상업교육학회 2023 상업교육연구 Vol.37 No.6
In competition between retail stores, geographical information such as the location of competing stores, in addition to price and product dispersion, is a very important factor. In this study, we attempted to examine how market performance is affected by the presence of nearby competitive stores in traditional markets. For this purpose, using the GIS (Geographical Information System) technique, the catchment area of the traditional market in Incheon was divided into areas within a 1km radius and Thyssen polygons. The sales of each traditional markets was used as the dependent variable, and the number of competitive stores in each catchment area was used as the independent variable. A multiple regression model was analyzed. As a result of the study, it was found that the competitive effect of competitive store varies greatly depending on its location and retail format. First, large discount stores and SSMs, which have traditionally been pointed out as having a negative effect on the performance of traditional markets, were found to have no significant impact on the sales of traditional markets. These results can be said to reflect the fact that the influence of large discount stores on local retail market is continuously decreasing due to internal and external environmental changes such as the recent increase in the e-commerce, the intensified competition between large retailers due to oversupply, and government regulations. Second, as the number of complex shopping malls increases, the sales per area of the traditional market decreases by 25,684 won. On the other hand, specialty stores showed an increase of 13,062 won to 29,039 won, and other large-scale stores showed an increase of 9,194 won. This fact shows that, unlike specialty stores and other large-scale stores, complex shopping malls located in city centers can have a negative impact on sales in traditional markets. Therefore, it can be said that it is important to comprehensively consider the large retail store's location (city center or suburb) and product dispersionon rather than judging its influence on the local retail district in advance.
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.
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.
유병국,Yoo Byung-Kook 한국융합신호처리학회 2004 융합신호처리학회 논문지 (JISPS) Vol.5 No.4
본 논문에서는 Takagi-Sugeno(T-S) 퍼지모델에 대한 가변구조제어방식을 제안하며 이를 이용한 바퀴구동 도립 진자의 자세제어를 보인다. 비선형 시스템이 T-S 퍼지모델로 모델링 될 수 있다는 가정 하에서 바퀴구동 도립진자에 대하여 몇 개의 대표 동작점을 기준으로 시스템을 선형화하여 퍼지모델을 얻고 이를 통해 가변구조제어이론을 도입하여 제어기를 설계한다. 제안된 제어법칙은 퍼지모델을 구성하는 각각의 선형 부 시스템의 입력이득 행렬을 동일한 행렬로 단일화하고 그 단일화된 제어이득행렬을 토대로 설계되어진다. 이득행렬의 단일화 과정에서 생성되는 불확실성은 가변구조제어 이론의 입력 외란으로 해석되어질 수 있으며 이러한 단일화 외란은 기존 가변구조제어의 강인성에 의해 해결되어질 수 있다. 바퀴구동 도립진자 시스템 예를 통해 제안된 제어알고리즘의 타당성과 유용성을 보인다. This paper suggests a fuzzy variable structure control scheme for Takagi-Sugeno(T-S) fuzzy model and presents the attitude control of the wheel-driven inverted pendulum(WDIP) based on the proposed control algorithm. The proposed controller is designed based on the T-S fuzzy modeling of nonlinear system and the unification of gain matrices in linear subsystems that constitute the overall fuzzy model. The uncertainties generated in the gain matrix unifying procedure can be interpreted as the input disturbances of the conventional variable structure control. These unifying disturbances can be resolved by using the robustness property of the conventional variable structure system. Design example for wheel-driven inverted pendulum demonstrates the utility and validity of the proposed control scheme.