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조영태 ( Young Tae Jo ),조래현 ( Rae Hyeon Jo ),설동화 ( Dong Hwa Seol ),양현 ( Hyeon Yang ),정지효 ( Ji Hyo Jung ),박정훈 ( Jeong Hun Park ) 한국환경분석학회 2015 환경분석과 독성보건 Vol.18 No.4
Laser Induced Breakdown Spectroscopy (LIBS) has been introduced as a type of analytical equipment to determine elements on the surface of various materials. In this study, standard and sample soils were molded to make a pellet for LIBS analysis. The soils were also digested with acids for ICP analysis. Accuracies ranging between 86.5% and 119.9%, an RSD of 12.3%, an LOD of 6.09 mg/kg, and an LOQ 19.41 mg/kg resulted from the analysis of copper in soils using LIBS. Correlations (R2) of LIBS with ICP-aqua regia digestion and with ICP-total digestion analysis concentrations were over 0.96 for 28 samples. The total analytical time for the LIBS method was 385 min, which was 43.4% shorter than for the ICP-OES method (680 min). For the analysis of copper in soils, LIBS can be used for on-site detection without chemical preparation.
광양만 유역의 수질 및 표층퇴적물에서의 PFOS 및 PFCs의 오염에 관한 연구
조현서(Hyeon Seo Cho),강조해(Jo Hae Kang),이대인(Dae In Lee),조천래(Chon Rae Cho),최민호(Min ho Choi) 한국해양환경·에너지학회 2005 한국해양환경공학회 학술대회논문집 Vol.2005 No.11
Per Fluorinated Compounds(PFCs) are fully fluorinated organic molecules produced synthetically in an electrochemical fluorination process PFOS, PFOA, PFHS, PFOSA are including among PFCs these compounds have high molecular weight and created are environmentally stable these compounds used in a variety of applications, such as in lubricants, paints, cosmetics, and fire-fighting foams. Produced and used widely over the last half-century, PFCs are being detected in wildlife and humans around the globe. Kwangyang Bay is a semi-closed coastal sea on the south coast of Korea. The total population within the bay watershed is approximately 240,000 people. Several rivers and ditches, including the Seomjin River, one of Korea's five biggest river systems, enter the bay, and seawater is exchanged with the South Sea at the southern part of the bay. The water depth is less than 5m in the western part of the bay, and is more than 20m near Myodo and in the eastern part of the bay. The area is characterised by a semidiurnal tide. Land-based pollution sources(river water, sediment) were investigated in January 2005 and seawater and sediment samples were collected in November 2004 and January 2005. Ranges of concentrations of PFOS, PFOA, PFHS and PFOSA in stream waters were ND-1411.5ng/L, ND-376.0ng/L, ND-488.0ng/L and ND-3.6ng/L, respectively. Stream sediments were ND-5.43ng/g dry-wt, ND-0.47ng/g dry-wt, ND-0.14ng/g dry-wt and ND-0.47ng/g dry-wt, respectively. Ranges of concentrations of PFOA in sea water at November 2004 were ND-5.0ng/L.. PFOS and PFOA in sea water at January 2005 were ND-14.3ng/L and ND-4.9ng/L, respectively.
용암해수와 홍삼추출물 혼합시료의 항염 및 항자극 효능 연구
조미래 ( Mi Rae Jo ),이성현 ( Sung Hyeon Lee ),이창석 ( Chang Seok Lee ) 대한미용학회 2021 대한미용학회지 Vol.17 No.3
In recent days, there is a growing attention toward well-being, health, and functional cosmetics. In this regard, the Jeju lava seawater and red ginseng have been widely applied as food and cosmetic in many industrial products. In the current research, a mixture of Jeju lava seawater and red ginseng extract has been confirmed to have an appropriate concentration for processing RAW264.7, HaCaT and THP-1 cells, 0.625% for RAW264.7, 3.125% for HaCaT. For THP-1 cell, the mixed sample at the concentration of less than 10% did not affect the cell viability. When the test was conducted based on this, the mixture of Jeju lava seawater and red ginseng extract significantly inhibited the expression of NO increase by LPS, and IL-8 increase by TNF-α and UVA. IL-8, IL-6 induced by UVB also showed significant inhibitory efficacy in a concentration-dependent manner. The result of suppression of the expressions of CD54 and CD86 cell surface proteins involved in the stimulation response in immune cells induced by stimulation with the chemical sensitizer DNCB, which is the cause of the immune response, suggest that the mixed sample is effective in anti-stimulation. This result shows that the mixture of Jeju lava seawater and red ginseng extract is a potential substance for skin inflammation relief and anti-irritation.
저현서(Cho Hyeon-Seo),강조해(Kang Jo-Hae),조천래(Cho Chon-Rae),박정채(Park Jeong Chae),이대인(Lee Dae-In) 한국해양환경·에너지학회 2006 한국해양환경·에너지학회 학술대회논문집 Vol.2006 No.-
시화호내ㆍ외해수와 유입되는 하천수 중 PFCs의 농도분포를 2005년 11월에 채취한 시료를 이용하여 분석하였다. 시화호의 표층수, 저층수 및 유입하천수 중의 농도는 perfluorohexanesulfonate (PFHS)가 ND~0.8, 0.3~0.5, 1.8~35.9 ng/L, perfluorooctanesulfonate (PFOS)는3 3.6~11.6, 3.6~8.1, 5.8~253.2 ng/L, perfluorooctanesulfonamide (PFOSA)는 ND~0.5, ND~0.4, 0.3~2.7 ng/L, perfluorononanoic acid (PFNA)는 ND~3.5, ND~0.6, ND-125.0 ng/L, pefluorooctanoic acid (PFOA)는 ND~3.3, ND~0.7, 0.7~405.5 ng/L의 범위로 각각 검출되었다. 전반적으로 PFOS와 PFOA가 전체 PFCs에서 상대적으로 높았으며, 지역별로는 시화호로 유입되는 하천수 중 산업단지부근에 위치한 L1~L5 지점에서 다른 조사지점의 농도에 비해 상대적으로 매우 높은 농도를 보였다. Water samples collected from the surface and bottom layer of Sihwa lake, and the inflow stream water around Sihwa lake were analyzed to determine the concentration of PFCs on November, 2005. Ranges of concentrations of perfluorohexanesulfonate (PFHS) in seawater of the surface and bottom layer of Sihwa lake and the inflow stream water around Sihwa lake were ND-0.8, 0.3~0.5 and 1.8~35.9 ng/L, respectively. Those of perfluorooctanesulfonate (PFOS) were 3.6~11.6, 3.6~8.1, 5.8~253.2 ng/L, perfluorooctanesulfonamide (PFOSA) were ND~0.5, ND~0.4, 0.3~2.7 ng/L, perfluorononanoic acid (PFNA) were ND~3.5, ND~0.6, ND~125.0 ng/L, perfluorooctanoic acid (PFOA) were ND~3.3, ND~0.7, 0.7~405.5 ng/L, respectively. Dominant compounds of PFCs were PFOS and PFOA. Concentrations in site(L1~L4) of inflow stream located on the industrial complex were higher than the values of seawater and the others stream.
정압력원을 이용한 에너지 절감 유압 시스템에 관한 실험적 연구
조용래(Cho Yong-Rae),안경관(Ahn Kyoung-Kwan),윤주현(Yoon Ju-Hyeon),이민수(Lee Min-Su),조우근(Jo Woo-Keon),윤홍수(Yoon Hong-Soo) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
It is strongly requested to reduce fuel consumption because of high oil price and exhaust gases of road vehicles for environmental preservation. To solve these problems, several types of hybrid vehicles have been developed. Among them, flywheel hybrid vehicle using variable displacement pump/motor was already proposed as one of the feasible hybrid systems in place of hybrid vehicle by the conventional storage battery. The proposed flywheel hybrid vehicle is to keep constant pressure of high pressure line by the control of swash plate angle of flywheel pump/motor as pressure compensator. The efficiency of the overall system depends severely on the efficiency of hydraulic pump/motor in the energy saving hydraulic control system by simulation. According to the control methods of swash plate angle of piston pump/motor, there remain several problems to be solved. In this paper, experimental setup for energy saving is fabricated and the efficiency of energy saving is investigated by experiments with respect to various experimental conditions.