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이동희(Donghui Lee),장한익(Han-Ik Jang),윤지훈(Ji-Hun Yoon) 한국경영과학회 2020 經營 科學 Vol.37 No.2
The 2007 U.S. subprime mortgage crisis shows the housing market crisis could expand into the financial market. Thus, if there is an early indicator of the housing market crisis, the financial crisis can be predicted in advance. This study calculates a volatility index for housing prices and examines whether the volatility index can account for information in the housing market, such as housing prices and the rate of change. The calculated volatility index confirmed that an increase over a fall in domestic housing prices was the predominant factor, especially the continued upward pressure on housing prices since 2016. On the other hand, the housing market has shifted from an upward trend to a downward trend since the second half of 2018 with each volatile index rising. As such, the ability to explain the housing price volatility indicators calculated for changes in the housing market was identified and the volatility indicators produced by them could be used as evidence to predict the housing market.
Holstein 젖소의 호흡기 질병 백신에 대한 면역반응성과 전장 유전체 연관 분석 연구
하승민 ( Seungmin Ha ),이동희 ( Donghui Lee ),이상명 ( Sangmyeong Lee ),채정일 ( Jungil Chae ),서강석 ( Kangseok Seo ) 한국동물위생학회 2019 한국동물위생학회지 (KOJVS) Vol.42 No.4
To detect Single nucleotide polymorphisms (SNP) markers associated with Bovine viral diarrhea virus (BVDV) and Bovine respiratory syncytial virus (BRSV) S/P ratio in Korean Holstein dairy cattle, Genomewide association study (GWAS) was performed using Illumina BovineSNP50 Beadchip. The number of phenotype data and genotype data were 107, and 294. respectively. Phenotype data were collected for four periods (0 week, 1 week, 4 week, 24 week) after having vaccinated (0 week no vaccinated period). A total of 36,257 SNPs was remained after quality control had been done by PLINK. The result of GWAS showed 6 SNP markers (BTB-01704243, BTB-01594395, ARS-BFGL-NGS-118070, ARS-BFGL-NGS- 111365, BTA-65410-no-rs, Hapmap38331-BTA-61256) under BVDV and 4 SNP markers (ARS-BFGLNGS- 109861, Hapmap53701-rs29017064, ARS-BFGL-NGS-71055, BTA-11232-no-rs) under BRSV. And also, 10 candidate genes found through 10 SNP markers (TBX18, CEP162, PAFAH1B1, METTL16, BRCA1, RND2, POLK, ENSBTAG00000051724, ADAM18, NRG3).
다양한 제조공정에 따른 사과주스의 이화학 특성 및 항산화 활성
김급래(Keup-Rae Kim),김건오(Keono Kim),박사무엘(Samuel Park),김승현(Seung Hyun Kim),김태완(Teawan Kim),이동희(Donghui Lee),성지혜(Jeehye Sung) 한국식품영양과학회 2024 한국식품영양과학회지 Vol.53 No.3
본 연구는 국내에서 제조공법에 따른 시판 사과주스의 이화학적 품질 특성, 항산화 활성 및 주요 플라보노이드 조성을 분석하였다. 본 연구에서 사과주스의 이화학적 특성을 분석한 결과 FC 주스에서 NFC 주스와 CF 주스보다 당도가 다소 낮은 반면 산도 및 pH는 유의적인 차이가 나타나지 않았다. 이외에도 각 시료의 색도 차이가 관찰되었지만 제조공정 차이에 의한 경향은 보이지 않았다. 항산화 활성 분석 결과 NFC 주스와 CF 주스의 항산화 활성이 FC 주스에 비해 유의적으로 높았다. 이러한 항산화 활성 차이는 사과주스 내 hydrophilic한 폴리페놀 및 플라보노이드 성분이 크게 기여한 것으로 사료된다. 사과주스 내 주요 플라보노이드는 phlorizin, (-)-epicatechin, procyanidin B1, procyanidin B2 및 procyanidin B5였으며 FC 주스와 비교해서 NFC 주스와 CF 주스의 함량이 높았다. 이는 사과주스 제조 시 농축과정 중 열처리로 인해 일부 플라보노이드를 포함한 항산화 성분들이 파괴되어 항산화 활성의 감소를 유도한 것으로 판단된다. Apple juice has recently attracted attention due to its high polyphenol content and antioxidant capacity. The present study investigated the flavonoid compositions and antioxidant properties of apple juices produced by cold filling (CF), from concentrate (FC), or not from concentrate (NFC). Flavonoid compositions were determined by LC-MS/MS using a triple quadrupole instrument, and antioxidant activities were evaluated using a ferric-reducing power assay and ABTS and DPPH radical scavenging assays. Results showed CF and NFC juices had significantly higher total phenolic and flavonoid contents than FC juice. Flavonoids detected and quantified included procyanidins, (–)-epicatechin, and phlorizin. Procyanidin B2 (0.45±0.03∼2.54±0.23 μg/mL) and (–)-epicatechin (0.70±0.03∼2.44±0.17 μg/mL) levels were significantly higher than those of other flavonoids in CF and NFC juices. In addition, NFC apple juice was the strongest radical scavenger and ferric ion reducer. These results suggest that CF and NFC apple juices be considered safe, effective, and natural products.