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효모추출복합물과 헛개나무 열매추출 복합물이 알코올 대사에 미치는 영향 -무작위, 이중맹검, 위약 대조군, 교차 인체적용시험-
조보람 ( Bo-ram Cho ),남충우 ( Choong-woo Nam ),정세영 ( Se-young Choung ),정인경 ( In-kyung Jeong ),문민선 ( Min-sun Moon ) 한국식품영양학회 2017 韓國食品營養學會誌 Vol.30 No.4
This study was conducted to investigate if the supplement formula may improve alcohol metabolism in healthy adult men. In a double-blinded, randomized, crossover study, subjects were administrated yeast extract mixtures (YEM, n=15), Hovenia dulcis mixtures (HDM, n=15), placebo (PLA, n=15), and control (CON, n=15) in an oral dose followed by one week washout periods. At each visit (0, 1, 2, 3, 4 week), subjects drank 450 mL, 20.1 percent alcohol after administered mixtures. Blood was drawn periodically (0, 0.25, 0.5, 1, 2, 4, 6, 15 hours). Fifteen subjects completed the protocol and were included in the analysis. Plasma ethanol concentration was lower in YEM (10 percent) and the HDM (5 percent) groups. The area under the curves (AUC) and Cmax for plasma ethanol were significantly decreased only in the YEM group, when compared with the CON group. The AUC and Cmax for plasma acetaldehyde concentration were significantly decreased in the YEM (45 and 54 percent) and the HDM (35 and 53 percent) groups respectively, when compared with PLA (p<0.01). Together, these findings validate that YEM or HDM improved alcohol metabolism and hangover syndromes, leading to reduce alcohol concentration and acetaldehyde concentration without adverse effects.
800㎪급 고압 CNG 인젝터가 적용된 1.4L T-GDI 엔진의 유해배출물 특성에 관한 실험적 연구
이태용(Tae Yong Lee),조용석(Yong Seok Cho),유준상(Jun Sang Yoo),김규성(Kyu Sung Kim),조민기(Min Ki Cho),이호길(Ho Gil Lee),남충우(Choong Woo Nam),김재광(Jae Kwang Kim),전완재(Wan Jae Jeon) 대한기계학회 2019 大韓機械學會論文集B Vol.43 No.6
강화되는 배기가스 규제를 만족시키기 위한 친환경 자동차 연구가 활발히 진행되고 있다. 그 중에서 천연가스는 풍부한 매장량과 경제성까지 갖추어 기존 화석 연료를 대체할 수 있는 우수한 연료로 평가되고 있다. 또한 기존 화석 연료와 비교하여 옥탄가가 높고 이산화탄소(CO2)의 배출량이 낮은 특성을 갖고 있다. 본 연구에서는 1.4L T-GDI 엔진에 고유량 및 고정밀 제어가 가능한 800 ㎪급 고압 CNG 인젝터를 적용한 Bi-fuel 시스템을 구축하여 실험을 진행하였다. CNG 점화시기는 가솔린과 동일하게 설정하고 실험을 진행하였다. 실험 결과 가솔린 대비 CO₂, THC, NOX의 배출량은 개선되었지만, 삼원 촉매에서 THC 변환효율은 저하되는 결과를 보였다. 이는 메탄(CH₄) 슬립에 기인한 결과로 판단된다. Research on environmentally friendly vehicles has been actively pursued to satisfy reinforced exhaust-emission regulations. Natural gas has sufficient reserves and economic efficiency, and it has been evaluated as an excellent fuel to replace existing fossil fuels. It also has a high octane number and low carbon-dioxide (CO2) emissions compared with conventional fossil fuels. In this study, we have constructed a bi-fuel system using an 800-㎪ high-pressure compressed natural gas (CNG) injector capable of a high flow rate and high-precision control in a 1.4L turbocharged gasoline direct-injection (T-GDI) engine. The ignition timing was the same as that of a gasoline engine. Experimental results showed that the CO₂, total hydrocarbon emissions (THC), and nitrogen oxide (NOX) emissions are improved compared with that of the gasoline engine; however, the THC conversion efficiency is deteriorated in the three-way catalyst. This is believed to be the result of a methane (CH₄) slip.