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GC/MS 분석에 의한 4-Octylphenol의 Carboxen 흡착에 대한 열역학적 연구
이준배 ( Joon-bae Lee ),박우용 ( Woo-yong Park ),손성건 ( Shungkun Shon ),정지은 ( Ji Eun Jung ),정용애 ( Yong Ae Jeong ),공보경 ( Bokyoung Gong ),김유나 ( Yu-na Kim ),권오성 ( O-seong Kwon ),팽기정 ( Ki Jung Paeng ) 한국공업화학회 2018 공업화학 Vol.29 No.3
혈액과 같이 다성분으로 이루어진 복잡한 matrix로 구성된 시료에서 휘발성 유기화합물(VOC)이나 반휘발성 유기화합물(SVOC)의 분석은 분리공정을 거쳐 분석되는 것이 일반적이다. 흡착은 어떤 성분이 다른 상의 표면에 축적되는 물리적 현상이다. 전처리 과정에서 번거로움을 극복하기 위해 흡착이 적용되며 이를 위해 다공성 탄소인 carboxen (CAR)이 도포된 solid phase microextraction (SPME) 장치가 흔히 사용된다. 본 연구에서는 플라스틱 제조시 가소제 등으로 사용되는 4-octylphenol의 carboxen에 대한 흡착특성을 살펴보았다. 이를 위해 dichloromethane (CH<sub>2</sub>Cl<sub>2</sub>, DCM), ethylacetate(CH<sub>3</sub>COOC<sub>2</sub>H<sub>5</sub>, EA) 및 diethylether (C<sub>2</sub>H<sub>5</sub>OC<sub>2</sub>H<sub>5</sub>, Et<sub>2</sub>O)에 대한 추출효율과 bistrimethylsilyltrifluoroacetamide (BSTFA), methylchloroformate (MCF) 및 pentafluorobenzylbromide (PFBBr)에 대한 유도체화 반응의 특성을 조사하였다. 열역학적특성 파악을 위한 추출용제로는 DCM이 양호한 효과를 보였으며 BSTFA를 이용한 silylation의 분석특성이 우수하여 이를 적용하였다. 열역학적 및 동력학적 흡착실험 결과 흡착과정은 흡열특성을 보였고 Langmuir식보다는 Freundlich등온식에 더 근접하였으며 동력학적으로는 pseudo-2<sup>nd</sup> order kinetic model에 따르는 것을 보였다. It is common to analyze volatile organic compound (VOC) or semi-VOC (SVOC) in a sample composed of a complex matrix consisting of multiple components such as bloods through a separation process. Adsorption is a physical phenomenon in which certain components accumulate on the surface of other phases. In order to overcome difficulties in the pretreatment process, an adsorption is frequently used. Solid phase microextraction (SPME) equipment with porous carbon carboxen (CAR) is an example of adsorption application. In this study, the adsorption of 4-octylphenol to carboxen was examined. To do so, the extraction efficiency for such solvents as dichloromethane (CH<sub>2</sub>Cl<sub>2</sub>, DCM), ethylacetate (CH<sub>3</sub>COOC<sub>2</sub>H<sub>5</sub>, EA) and diethylether (C<sub>2</sub>H<sub>5</sub>OC<sub>2</sub>H<sub>5</sub>, Et<sub>2</sub>O) was studied and also the derivatization reaction for 4-octylphenol with reagents of bistrimethylsilyltri-fluoroacetamide (BSTFA), methylchloroformate (MCF) and pentafluorobenzylbromide (PFBBr) was compared. The combina-tion of DCM and BSTFA showed good performance thus they were adopted for this study. Thermodynamic adsorption experi-ments showed that the adsorption process was endothermic and Freundlich isotherm equation was more suitable than Langmuir isotherm. It was also found that the adsorption followed a pseudo-2<sup>nd</sup> order kinetic model.
엔진윤활유 중 Ethylene Glycol의 용제추출후 bistrimethylsilyltrifluoroacetamide(BSTFA)를 이용한 GC/MS 분석에 관한 연구
이준배(Joon-Bae Lee),권오성(O-Seong Kwon),유재훈(Jae-Hoon You),손성건(Shungkun Shon),성태명(Tae-Myung Sung),팽기정(Ki-Jung Paeng) 한국트라이볼로지학회 2012 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.28 No.6
For proper functioning, general machines usually need lubricant oil as a cooling, cleaning, and sealing agent at points of mechanical contact. The quality of lubricant oil can deteriorate during operation owing to various causes such as high temperature, combustion products and extraneous impurities. In this study, a heavy load stopped during operation, and the oil was analyzed to check whether any impurities were added. Extraction using acetonitrile followed by reaction with BSTFA(bistrimethylsilyl trifluoroacetamide) showed that, trimethylsilylated ethylene glycol was present in the lubricant oil. To quantify the ethylene glycol in the oil, deuterium-substituted ethylene glycol, which acted as an internal standard, was added to the sample and then extracted with the solvent. Next, the extract was reacted with the derivatizing agent(BSTFA) and then analyzed with GC/MS. The detection limit of this method was found to be 0.5 ㎍/g and the recovery of oil containing 20,000 ㎍/g of ethylene glycol was measured to be 94.8%. A damaged O-ring and eroded cylinder liner were found during the overhaul, which implied the leakage of coolant containing ethylene glycol into the lubricating system. The erosion of the cylinder liner was assumed to be due to cavitation of the coolant in the cooling system.
Nitrox 공기통의 기체 분석에 의한 스쿠버다이버 사망원인 추정에 관한 사례연구
이준배 ( Joon Bae Lee ),유재훈 ( Jae Hoon You ),손성건 ( Shung Kun Shon ),성태명 ( Tae Myung Sung ),팽기정 ( Ki Jung Paeng ) 한국안전학회(구 한국산업안전학회) 2011 한국안전학회지 Vol.26 No.2
Going underwater is supposed to begin with the history of human beings. At first it was confined to relatively shallow level, less than several meters by holding breath. Recently, deep level diving has been necessary for such purpose as construction, maritime salvage, military operations, research and sports by using SCUBA(self-contained underwater breathing apparatus) equipment. As one goes down into water, the pressure on the diver is increased due to water pressure with depth, usually 1atm for each 10m water level. In deep water, mixed gas or nitrox (EAN, enriched air nitrox) could be applied for the divers lest they should get disease due to high pressure. Of these, the former is usually composed of oxygen and inert gas like helium or hydrogen, the latter contains higher oxygen content than that in normal air in which the oxygen concentration is designated by the character “EAN” followed by vol. % of oxygen, for example, “EAN 40” contains 40% of oxygen. In this case, a victim was found at the 39 m below the sea surface breathing air and nitrox in cylinder wrongly marked as EAN 36, which was analyzed to contain 63% of oxygen by GC/TCD. The cause of death could not be exactly related with the oxygen content in the nitrox cylinder, because the accurate depth for the victim to dive was not known, even though the victim was just found at the depth of 39 m. However, the wrongly marked nitrox could be believed to be the main cause of the death at the depth unless there happened any other accident except that during diving.
대학생의 운동참여수준에 따른 운동열정과 우울 및 정서적 행복감
손준호(Shon, Joon-Ho),김기만(Kim, Ki-Man),김명미(Kim, Myung-Mi) 한국체육과학회 2019 한국체육과학회지 Vol.28 No.3
The purpose of this study is to establish the relationship between the differences between exercise passion and depression and emotional happiness according to the level of participating in the movement of university students. Finally, data of 228 people was used in the analysis, and frequency analysis, factor analysis, Cronbach"s α, correlation analysis, multi-variate analysis and multiple regression analysis were applied for statistical analysis using the SPSS Win Version 18.0K. As a result of this study, it was found that the higher the level of exercise participation, the higher the level of harmony and obsessive passion, and the greater the duration and time of participation, the higher the sense of happiness. As a result of studying the relationship between factors, it was found that harmony passion in the exercise passion positively effects a depression, and compulsion passion increases depression. And it turns out that harmony passion has a positive effect on emotional happiness, and depression has a negative effect on emotional happiness.
김기수,김준한,손광수,송준영 대한골절학회 2000 대한골절학회지 Vol.13 No.4
Purpose: To analyze the clinical features and treatment results of the tibial segmental fractures with the interlocking nailing. To compare the results between the segmental fractures with (Group I ) or without (Group II ) involving proximal portion of the tibia. Materials and Methods: We analyzed 16 patients, 16 cases of the tibial segmental fractures treated with the interlocking nailing between April 1993 and November 1998. Results: We obtained solid bone union for all cases and relatively good clinical results. The average bone union time was 20.6 weeks. The functional results were excellent in 7 cases, good in 6 cases and fair in 3 cases. There were 8 cases of malunion. The comparison between Group I and Group II revealed no remarkable differences for bone union time, functional results and complications. But the tendency of the malunion was more higher in Group I. Conclusion: For segmental tibial fractures, interlocking nailing showed good clinical results. We propose that open reduction and internal fixation should be done before interlocking nailing of the fractures involving proximal portion of the tibia.