http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
토픽모델링을 활용한 우리나라 커피 관련 연구의 동향 분석 -2015년부터 2023년까지-
이길상 한국커피협회 2023 한국커피문화연구 Vol.9 No.2
This study analyzed words included in the Korean abstracts of 1,011 coffee-related academic papers published in 346 academic journals in Korea from January 2015 to August 2023. As a result of analysis using Latent Dirichlet Allocation (LDA) topic modeling, it was found that coffee-related research in Korea has been very active focusing on five areas since 2015. The most prominent topics are those related to coffee shops and consumers. This can be seen as a general trend in coffee research in Korea since the late 1990s. The second topic is related to the spatial characteristics of coffee shops. Macroscopic studies showing topography related to the coffee industry or culture emerged as the third topic of interest. Fourthly, topics related to the production of coffee drinks and the scientific characteristics of coffee, and finally topics related to the impact of coffee and the future of coffee. The biggest characteristic of coffee-related research in Korea is the high proportion of research related to consumer satisfaction related to coffee shops or the spatial characteristics of coffee shops. In other words, in coffee-related research, various terms related to the characteristics of coffee as a service industry appear with the highest frequency. As a result of selecting Korean abstracts for analysis, there is a limitation in not including excellent research results that provided English abstracts. There is also a possibility that the researcher's subjectivity may have been involved as the preprocessing procedure for the selected nouns was led by the researcher. In this type of research, efforts will be needed to minimize the bias of a single researcher by having multiple researchers participate in the preprocessing process.
Benzaldehyde와 Semicarbazide의 결합에 미치는 pH치의 영향
이길상,김인자 대한약학회 1962 약학회지 Vol.6 No.1
Like the condensation reaction of general aldehyde, that of benzaldehyde with semicarbazide also depends upon the concentration of carbonium ion that is produced by hydrogen ion. The lower pH value is the facility of the formation of carbonium ion in the condensation reaction, while the reactivity of semicarbazide as a reactant is reduced. In this paper, therefore we want to find out the optimum pH value in the condensation reaction of benzaldehyde with semicarbazide. This optimum pH value was determined by using the simple paper-chromatographic method. According to the result of this experiment, the condensation reaction between benzaldehyde and semicarbazide reacts with its highest point at 3.5pH value. It seems clear that at this point the benzaldehyde acquires the most suitable amount of carbonium ion for the condensation reaction with semicarbazide, and the semicarbazide also has the optimum reactivity.