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조윤희(Jo, Yunhee),이원제(Lee, Won Jae),이성근(Yi, Seong Keun) 한국상품학회 2009 商品學硏究 Vol.27 No.3
단수가격에 관한 연구가 많이 이루어진 미국의 화폐 단위는 달러($)와 센트(¢), 두 가지로 표시한다. 하지만 우리나라의 경우 원(\) 단위가 유일하며, 1원 단위는 일반적인 현금 거래에서 통용되지 않는 화폐단위이다. 이처럼 기본적인 화폐 단위에 대한 차이가 있기 때문에 미국의 단수가격의 효과에 관한 실험 결과를 우리나라의 가격 연구에 그대로 받아들일 수 없다. 또한 단수가격의 효과에 관한 기존 연구들은 일반적으로 관여도가 낮은 저가격 제품을 대상으로 하고 있다. 따라서 우리나라의 경우에도 저가격 제품일 때 소비자의 가격에 대한 태도가 긍정적인지에 관한 연구와, 저가격 제품과 비교해 고가격 제품에서 단수가격을 사용하는 경우 그 효과가 달라지는지에 관한 연구를 하고자 한다. 실험 결과, 저가격 제품에서는 선행 연구에서처럼 단수가격에 대한 소비자의 태도가 정수 가격에 대한 소비자의 태도 보다 긍정적이었지만, 고가격 제품에서는 단수가격에 대한 소비자의 태도가 정수가격에 대한 소비자의 태도 보다 부정적으로 나타남을 증명하였다. 그러나 브랜드 인지도와 소비자의 가격에 대한 태도는 서로 상관이 없는 것으로 나타났다. Odd-price effect has been mainly applied to the goods with lower level price because consumers do not process the price information elaborately in the low involvement situation. Additionally as consumers have a tendency to process the price information from the left to the right digit, they perceive the goods with odd-price as much cheaper. The meaning of odd-price has some difference between U.S. and Korea. Usually odd-price in U.S. means 9-ending price. In Korea, odd-price should not be 9-ending price because unit "won" in price is perceived as a very small amount, the price strategy with 9-ending can not used. Thus, the odd-price should be the price ending at least 10 won. For that reason we can't apply the same concept used in U.S. to the Korean market. Based on the previous studies, I was concerned that odd-price policy still had an effect on the consumer attitude in Korean currency and that it could be applied to the good sith high level price. Additionally I checked how the brand moderates the effect of odd-price because brand could give some trust for the justification of the strategy.
Effect of feeding raw potato starch on the composition dynamics of the piglet intestinal microbiome
Yi, Seung-Won,Lee, Han Gyu,So, Kyoung-Min,Kim, Eunju,Jung, Young-Hun,Kim, Minji,Jeong, Jin Young,Kim, Ki Hyun,Oem, Jae-Ku,Hur, Tai-Young,Oh, Sang-Ik Asian Australasian Association of Animal Productio 2022 Animal Bioscience Vol.35 No.11
Objective: Raw potato starch (RPS) is resistant to digestion, escapes absorption, and is metabolized by intestinal microflora in the large intestine and acts as their energy source. In this study, we compared the effect of different concentrations of RPS on the intestinal bacterial community of weaned piglets. Methods: Male weaned piglets (25-days-old, 7.03±0.49 kg) were either fed a corn/soybean-based control diet (CON, n = 6) or two treatment diets supplemented with 5% RPS (RPS5, n = 4) or 10% RPS (RPS10, n = 4) for 20 days and their fecal samples were collected. The day 0 and 20 samples were analyzed using a 16S rRNA gene sequencing technology, followed by total genomic DNA extraction, library construction, and high-throughput sequencing. After statistical analysis, five phyla and 45 genera accounting for over 0.5% of the reads in any of the three groups were further analyzed. Furthermore, short-chain fatty acids (SCFAs) in the day 20 fecal samples were analyzed using gas chromatography. Results: Significant changes were not observed in the bacterial composition at the phylum level even after 20 d post feeding (dpf); however, the abundance of Intestinimonas and Barnesiella decreased in both RPS treatment groups compared to the CON group. Consumption of 5% RPS increased the abundance of Roseburia (p<0.05) and decreased the abundance of Clostridium (p<0.01) and Mediterraneibacter (p< 0.05). In contrast, consumption of 10% RPS increased the abundance of Olsenella (p<0.05) and decreased the abundance of Campylobacter (p<0.05), Kineothrix (p<0.05), Paraprevotella (p<0.05), and Vallitalea (p<0.05). Additionally, acetate (p<0.01), butyrate (p<0.05), valerate (p = 0.01), and total SCFAs (p = 0.01) were upregulated in the RPS5 treatment group Conclusion: Feeding 5% RPS altered bacterial community composition and promoted gut health in weaned piglets. Thus, resistant starch as a feed additive may prevent diarrhea in piglets during weaning.
Characterization of pH-dependent structural properties of hydrolase PncA using NMR
Yi, Jong-Jae,Kim, Won-Je,Rhee, Jin-Kyu,Lim, Jongsoo,Lee, Bong-Jin,Son, Woo Sung Korean Magnetic Resonance Society 2018 Journal of the Korean Magnetic Resonance Society Vol.22 No.4
Catalytic enzyme Pyrazinamidase (PncA) from Mycobacterium tuberculosis can hydrolyze substrate pyrazinamide (PZA) to pyrazoic acid (POA) as active form of compound. Using NMR spectroscopy, pH-dependent catalytic properties were monitored including metal binding mode during converting PZA to POA. There seems to be a conformational change through zinc binding in active site from the perturbation of peak intensities in series of 2D HSQC spectra the conformation changes through zinc binding.
Jae-Won Jang,Kyung-Eun Min,Cheolhee Kim,Jesik Shin,Jiwoon Lee,Sung Yi 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.3
The goal of tissue engineering is to replace or regenerate damaged tissue. Scaffold fabrications and biomaterial selections are crucial factors for artificial tissue and bone tissue engineering, which are important due to the limited availability of tissue donors. This paper reviews the scaffold design considerations, manufacturing methods, and biomaterials for bone tissue engineering, and discusses current challenges and future perspectives. Scaffolds are required to have non-hazardous properties such as biocompatibility and biodegradability for the human body, and the necessary mechanical properties to support body weight, or to perform other roles, depending on the type of tissue. Moreover, scaffold structures such as porosity, pore size, and pore shape should be optimized to achieve cell viability and proliferation. Many conventional fabrication methods including thermally induced phase separation, emulsion freeze-drying, solvent casting, gas forming, and electrospinning have been studied and developed, but 3D printing is more suitable for bone tissue engineering because of its ability to manufacture complicated structures. Biomaterials can be divided into four categories: polymer, ceramic, metal, and composites. Composites blend two or more biomaterials to achieve desired properties for matching individual patient conditions. Finding a balance between fabrication method and biomaterial selection, in order to match properties between the scaffold and the target tissue, will be key to the field of bone tissue engineering in the future.
Enzyme-Linked Immunosorbent Assay to Detect the MHV Infection in Mice
Yi-Rang Na,Seung-Hyeok Seok,Min-Won Baek,Hui-Young Lee,Dong-Jae Kim,Kyoung-Jin Noh,Sung-Hoon Park,Hyun-Kyoung Lee,Noton Kumar Dutta,Byoung-Hee Lee,Jae-Hak Park 한국실험동물학회 2006 Laboratory Animal Research Vol.22 No.4
Mouse hepatitis virus (MHV) is one of the major troublesome infectious diseases in laboratory mice. ELISA techniques generally have been shown to be more sensitive than other diagnostic methods for detection of MHV infection. Here, we developed an ELISA test method by using MHV type-2 strain and it gave reliable test results about detection of MHV infection in mice with high accuracy and low costs.