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박준희(Park, Joon Hee),도쑤웬푸(Do, Xuan Phu),구오흥(Nguyen, Quoc Hung),강옥현(Kang, Ok Hyun),최승복(Choi, Seung-Bok) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.5
This paper presents optimal design procedures of mount based on a magnetorheological(MR) fluid to isolate the vibration in heavy diesel engine system. At first, frequency response and force-displacement transmissibility methods are used to get required damping force that is necessary for effective vibration isolation. From this result, a new type of high damping force engine mount is proposed and the governing equation of Bingham plastic behavior of MR fluid in flow path is mathematically derived under cylindrical coordinates. Finally, parametric design optimization featuring finite element is performed using ANSYS software to get the required damping force in MR mount system which can be used to reduce engine vibration. Damping force of the MR mount is then determined as an objective function in this analysis based on ANSYS. Furthermore, Magnetic analysis is then applied in this process.
박준희 ( Park Joon Hee ),양달훈 ( Yang Dal Hun ),김장호 ( Kim Jang Jay Ho ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.1
본 연구는 기존의 구조물 보수·보강 및 내진공법인 FRP시트 부착공법의 단점을 보완하고 내진보강 성능을 향상시키는 기술로, 국내 실정에 맞는 맞춤형 고연성 고인성 폴리우레아 보수·보강 재료의 개발을 목적으로 진행되고 있다. 이에 따라 다양한 배합별 폴리우레아의 휨 보강성능을 평가하였다.
여름철 안전모 착용자들을 위한 안전모용 냉매팩의 개발 및 평가
박준희(Joon-Hee Park),최정화(Jeong-Wha Choi) 한국생활환경학회 2010 한국생활환경학회지 Vol.17 No.2
The present study was conducted to develop and evaluate the safety helmet widely used in various industries by workers in summer. The three methods of the frozen gelled pack test, head manikin test and human wear test were performed to investigate effects of frozen gelled pack inside safety helmet. The results were as follows. First, in efficiency test of the frozen gelled pack, the frozen gelled pack B had a low surface temperature (p<.01) but was heavy. New that was lighter in weight than B remained a similar level. Second, in head manikin tests, surface temperatures in head and vertex were the lowest in HB and the highest in NH. The temperature inside the safety helmet was the highest in OR (p<.01). Third, in human wear tests, considering both weight of frozen gelled pack and effects of light frozen gelled pack on physiological response such as heart rate, sweat rate, mean skin temperature and skin temperature of forehead, cheek, etc., HNew was the most excellent. Subjective sensations did not differ significantly but participants voted that HNew was less hot, more comfortable and less wet on the head.
박준희(Joon Hee Park),강병원(Byoung Won Kang),김지은(Ji Eun Kim),서민정(Min Jeong Seo),이영춘(Young Choon Lee),이재헌(Jai Heon Lee),주우홍(Woo Hong Joo),최영현(Yung Hyun Choi),임학섭(Hak Seob Lim),정영기(Yong Kee Jeong),이복규(Bok Ky 한국생명과학회 2008 생명과학회지 Vol.18 No.3
본 연구는 탱자(Poncirus trifoliata) 과피의 80% 에탄올 추출물(PTP)에 대한 항산화 활성과 면역 활성을 유자(Citrus junos) 과피 추출물(CJP)과 비교하였다. 총 phenol 함량과 총 flavonoids 함량은 PTP가 각각 60.75±1.15 ㎎/100 g과 33.75±0.15 ㎎/100 g이었으며, 이는 CJP에 비해 다소 낮았다. PTP의 항산화 활성은 농도 의존적으로 증가하였으며 CJP의 항산화 활성과 비슷하게 나타났다. 면역반응 중 대식세포가 생성하는 NO 생성량을 측정한 결과 CJP와 PTP를 단독으로 처리한 경우와 LPS와 혼합하여 처리한 경우 모두 1㎎/ml까지는 대조구와 비교하여 농도 의존적으로 증가하였으나 고농도에서는 감소하는 경향을 나타내었다. 비장세포를 이용한 면역세포 증식능에서 CJP와 PTP를 첨가한 경우, 1 ㎎/ml까지는 대조구와 비교하여 농도 의존적으로 증가하였으나 고농도에서는 감소하였다. In this study, we compared with 80% ethanol extracts from peel of Poncirus trifoliata (PTP) and peel of Citrus junos (CJP) against antioxidant and immune activities. Total phenolics and flavonoids contents in PTP extracts were 60.75±1.15 and 33.75±0.15 ㎎/100 g, respectively, and those were lower than CJP extracts. Antioxidant activities of PTP were increased with the more concentration, and were similar to CJP. Antioxidant activities of PTP were increased with increasing of concentration, and were similar to those of CJP. The NO production in macrophage cell lines were increased in a dose-dependent manner, until 5 ㎎/ml of CJP and 1 ㎎/ml of PTP compared with control cells, but decreased at higher concentrations. The proliferation of mouse spleen cells were increased in a dose-dependent manner, until 1 ㎎/ml of CJP and PTP compared with control cells but decreased at higher concentrations. The NO production in macrophage cell lines treated with PTP and CJP were increased in a dose-dependent manner, compared with untreated control cells until the concentrations of 1~5 ㎎/ml (CJP) and 1 ㎎/ml (PTP) but decreased at higher concentrations than that. The proliferation of mouse spleen cells treated with PTP and CJP were increased in a dose-dependent manner, compared with untreated control cells until the concentration of 1 mg/ml but decreased at higher concentrations than that.