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Lactobacillus plantarum 에 의한 흰 민들레 발효물의 항산화 및 광노화 억제 효과
홍지우(Ji Woo Hong),박하영(Ha Young Park),김준희(Jun Hee Kim),염서희(Yeom Suh Hee),김진우(Jin Woo Kim) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.4
본 연구는 김치로부터 β-glucosidase 생산하는 Lactobacillus plantarum SM4를 분리하여 흰 민들레 발효를 수행하고 미백과 주름개선 효과를 가지는 생리활성 평가를 위해 총 폴리페놀 함량, 플라보노이드 함량, 항산화 활성, 타이로시네이즈 활성저해, 콜라게네이즈 활성저해, 자외선 차단율을 분석하였다. 흰 민들레 발효물의 총 폴리페놀 함량이 41.8±0.26 ㎎ GAE/g DW로 열수추출물 21.4±0.67 ㎎ GAE/g DW에 비해 2배 가량 증가하였으며 항산화 활성은 65.6±4.7%로 4배 증가하였다. 미백과 주름개선의 지표인 타이로시나아제 및 콜라게네이즈 활성저해에 있어 흰 민들레 발효물이 87.9±4.73%와 66.7±3.48%로 열수추출물에 비해 각각 2.4배와 1.5배 증가한 결과를 보였다. 흰 민들레 발효물과 열수추출물의 자외선 차단 효과를 비교하였을 때, UVA(320 ㎚) 차단율이 각각 64.7%와 15.2%로 측정되어 흰 민들레 발효물이 열수추출물에 비해 더 높은 효과를 나타내어 김치로부터 분리한 L. plantarum SM4가 생산하는 β-glucosidase를 발효를 통해 피부 미백, 주름 방지, 자외선 차단 효과가 증진됨을 확인하였다. Lactobacillus plantarum SM4, a strain producing β -glucosidase, was isolated from kimchi and fermented with white Taraxacum coreanum to enhance the production of bioactive compounds. The total polyphenol content(TPC), total flavonoid content(TFC), radical scavenging activity(RSA), tyrosinase inhibitory activities(TIA), and collagenase inhibitory activities(CIA) were measured to evaluate the skin whitening and anti-wrinkle effects of the fermented product. The TPC of fermented white T. coreanum was 41.8±0.26 ㎎ GAE/g DW, which was approximately two times higher than the hot-water extraction of 21.4±0.67 ㎎ GAE/g DW. RSA, an indicator of antioxidant activity, was 65.6±4.7% in fermentation, which is four times higher than that of the hot-water extract. TAI and CAI, which are indicators of the whitening and anti-wrinkle effects, were 87.9±4.73% and 66.7±3.48%, respectively, which were 2.4 and 1.5 times higher than those of hot-water extraction. When comparing the UVA(320 ㎚) protection effects of fermented and hot-water extraction, the fermented white T. coreanum showed higher protection with an absorption rate of 64.7% and 15.2%, respectively. The white T. coreanum fermented product showed higher bioactive properties and improved skin whitening, anti-wrinkle, and UV protection effects through the production of β-glucosidase from L. plantarum SM4.
PIV와 LDV를 이용한 냉각수 토출구 주위의 와류 가시화 연구
홍지우(Ji-Woo Hong),신수용(Su-Yong Shin),안병권(Byoung-Kwon Ahn) 한국가시화정보학회 2021 한국가시화정보학회지 Vol.19 No.3
Submerged and semi-submerged vehicles expel cooling water through an outlet. In this process, induced noise and vibration by the flow around the outlet have been reported, and it may cause problems directly related to survivability of the navy vessels. The coolant outlet has a net-type structure and circular columns are mostly used. In this study, flow measurements using PIV and LDV were performed for different type outlets; conventional (flat plate with round bar) and improved (flat and flat plate) configurations. Experiments were conducted at a cavitation tunnel where pressure and steady flow rate conditions are ensured for sufficient time to measure the flow. The average velocity field of the outlets were measured and compared through LDV measurements, and instantaneous vorticities were evaluated through PIV measurements. The results show that the improved type of the outlet is advantageous in terms of flow stability compared to the conventional type of the outlet.
콩나물부산물로부터 열수추출을 이용한 폴리페놀과 플라보노이드 생산
홍지우 ( Ji Woo Hong ),감다혜 ( Da Hye Gam ),김화영 ( Hwa Young Kim ),김진우 ( Jin Woo Kim ) 조선대학교 공학기술연구원 2020 공학기술논문지 Vol.13 No.4
Spent bean sprouts (SBS) are produced during the cultivation, cleaning, and packaging processes for bean sprouts. They account for 50% of total bean sprout production and cause environmental problems and waste disposal costs. This study was conducted to produce bioactive materials including phenolic compounds and flavonoids from SBS in order to produce value-added materials and reduce waste disposal costs. The optimization of extraction conditions was investigated for selection of solvents and evaluation of the effects of main variables, including solvent concentration, extraction temperature, and extraction time. Among these three variables, ethanol concentration showed the greatest effects on the production of total phenolic compound (TPC) and total flavonoid content (TFC). The optimal extraction condition was found to be 57.2˚C, 78.7 min, and 39.0% ethanol (v/v), which resulted in 28.0 mg GAE/g DM for TPC and 1.52 mg QE/g DM for TFC. The production of high concentrations of phenol compounds and flavonoids from SBS by hot-water extraction proves that SBS can be used in the production of functional food and cosmetics materials.
홍지우(Ji-Woo Hong),안병권(Byoung-Kwon Ahn) 한국가시화정보학회 2021 한국가시화정보학회지 Vol.19 No.2
In order to design a propeller with high efficiency and excellent cavitation performance, theoretical and experimental studies on the cavitation and noise characteristics according to the blade section shape are essential. In general, sheet cavitation, bubble cavitation, and cloud cavitation are the main causes of hull vibration and propeller surface erosion. However vortex cavitation, which has the greatest influence on the noise level because the fastest CIS in ship propeller, has been researched for a long time and studies have been conducted recently to control it. In this experiment, the development process of cavitation was measured by using three dimensional wings with two different wing section and wing tip shapes, and the noise level at that time was evaluated. In addition, we evaluated the relationship between cavitation inception and hydrodynamic force using three component load cell and we measured the velocity field of wing wake using LDV.
PIV를 이용한 2차원 쐐기형 몰수체 후류의 비공동 및 공동 유동장 계측
홍지우(Ji-Woo Hong),정소원(So-Won Jeong),안병권(Byong-Kwon Ahn) 한국해양공학회 2019 韓國海洋工學會誌 Vol.33 No.1
The vortex flow behind a bluff body has been a subject of interest for a very long time because of its engineering applicability such as to vortex induced vibration. In the near wake of a bluff body, vortices are periodically shed in two shear layers, which originate in the trailing edges. The far wake is made up of the classical Karman vortices, which are connected together by streamwise and spanwise vortices. These vortex formations have been studied in many experimental and numerical ways. However, most of the studies considered non-cavitating flow. In this study, we investigated cavitating flow in the wake of a two-dimensional wedge. Experiments were conducted in a cavitation tunnel of Chungnam National University. Using a particle image velocimetry (PIV), we measured the velocity fields under two different flow conditions: non-cavitating and cavitating regimes. We also investigated the vortex shedding frequencies using an absolute pressure transducer mounted on the top of the test window. Throughout the experiments, it was found that the shedding frequency of the vortex was strongly affected by cavitation, and the Strouhal number could exceed its value in the non-cavitating regime.
홍지우 ( Jee-woo Hong ),염지훈 ( Ji-hoon Yeom ),김경환 ( Kyong-hwan Kim ) 한국생산성학회 2018 生産性論集 Vol.32 No.4
While the participation rate of women in economic activities are becoming higher globally, Korea is still at the lowest level among OECD countries with only a slight increase. The importance of female entrepreneurship is emphasized in terms of enabling non-economically active women to be called economically active people through entrepreneurship rather than reemployment in the period of the 4th Industrial Revolution, contributing to the innovation growth of the national economy, and thus business creation as a part of women's economic activities can be an alternative for changes and growth of Korean economy. Previously, studies on female entrepreneurship have been focused on its status, support policy, the relationship between entrepreneur's characteristics and performances, and training. In order to reinvigorate female entrepreneurship, understanding of general phenomena of business creation is necessary, which in turn requires a study on the entrepreneurial intention, the starting point of entrepreneurial behaviors. Hence, in this study, a research model was designed on the basis of theory of planned behavior, social capital and social support for factors affecting the entrepreneurial intention of female entrepreneurs, and its verification attempted. For this purpose, interviews and an online survey were conducted on 150 potential female entrepreneurs, and the collected data were analyzed using statistical programs, SPSS 23.0 and AMOS 23.0. The analysis showed that attitude, subjective norm, perceived behavioral control and social capital had a significant impact on entrepreneurial intention while social support did not. As a result of this study, it is interpreted that the ability to utilize active social interaction among female entrepreneurs in the Korean society where networking is important is needed. It is expected that the findings of this study can be utilized as basic data that suggest a direction of new development to build a smooth support system for female startup companies, and contribute to the growth of female entrepreneurs.
강활속단탕(羌活續斷湯)이 골세포(骨細胞) 기능(機能)에 미치는 영향(影響)
이택준,홍지우,최현주,길인호,정선충,황귀서,이기남,Lee Taek-Jun,Hong Ji-Woo,Choi Hyun-Ju,Gil In-Ho,Jeong Sun-Chung,Hwang Gui-Seo,Lee Ki-Nam 대한예방한의학회 2004 대한예방한의학회지 Vol.8 No.2
This study was performed to evaluate the effect of Kangwhal-Sokdan tang(KS) on osteoblast function and gene expression. The osteoblast separated from the murine calvariae and MG-63 cell were cultivated to evaluate the cell function and gene expression. The results were summarized as followes. 1) KS increased cell proliferation of murine calvarial cell. 2) KS increased protein synthesis, collagen synthesis and ALP activity of murine calvarial cell. 3) KS increased the survival rate of murine calvarial cell. 4) KS increased the expression of calcitonin receptor and PTH receptor. 5) KS increased the expression of PKA and PKC. 6) KS decreased the expression of $PLA_2$, COX, $PGE_2$ synthase, but increased prostacyclin synthase. 7) KS increased the expression of collagen(type IV) gene. It is concluded that KS might improve the osteoporosis resulted from augumentation of osteoblast proliferation and gene expression.