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홍정우,이원철,이희승 대한화학회 2023 Bulletin of the Korean Chemical Society Vol.44 No.12
We present an optimized method for the stereoselective synthesis of five-membered alicyclic and heterocyclic trans-β-amino acid derivatives. The process involves a reductive amination of β-keto esters using chiral auxiliary amines, with formic acid acting as a facilitator for rapid, diastereoselective reductions under gentle conditions. Our approach notably enhances isolated yields and permits the scalable production of trans-2-aminocyclopentanecarboxylic acid (trans-ACPC), 4-aminopyrrolidine-3-carboxylic acid (trans-APC), 4-aminotetrahydrofuran-3-carboxylic acid (trans-ATFC), and 4-aminotetrahydrothiophene-3-carboxylic acid (trans-ATTC) building blocks.
국·내외 온라인 여행사 이용객의 유형 분석: Q방법론을 사용하여
홍정우,김미정,유형숙 (사)한국관광레저학회 2019 관광레저연구 Vol.31 No.10
The purpose of this study is to identify the types of customers in their 20's who use domestic and international online travel agencies(OTA). While the traditional research related to online travel divides the market through an R methodological approach and identifies the type of consumers, this study seeks to discover the types of Korean customers in their 20’s who use online travel agencies. This study selected 30 users of the OTA platform in Busan area and conducted Q methodologies using the PQMethod program. Five types of customers were observed to be classified as a result of the analysis. The domestic market, which began to form a full-fledged online travel business in the 2012s through the FTA, is only a small potential market compared to other advanced countries, but it is expected to change as globalization and popularization continue to progress.