• 한국대기환경학회지
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• 제18권6호
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• pp.527-538
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• 2002

In this study, the performance of sampling and of analytical methodology was examined against a number of selected volatile organic compounds (VOCs) in the ambient air. The canister-based sampling method for VOCs has been a viable and widely used approach that is based on research and evaluation performed over the past several years. VOCs were determined using canisters by GCMSD analysis. A total of target analyses in this study included approximately 30 VOCs designated in TO-l4A categories including BTEX. The methodology for QC(quality control) was intensively investigated with a wide range of performance criteria such as; (1) cleanliness of canisters, (2) reproducibility of diluter, (3) instrumental detection limits of preconcentrator and GCMSD, and (4) precision and accuracy of GCMSD. For most of the compounds tested, precision was less than $\pm$5%, IDL was 0.2 ppbv, accuracy was $\pm$5%, respectively. This study demonstrated that the combination of canister sampling and GC/MSD analysis could be reliably applied to the measurements of BTEX in ppbv levels that are typically observed in/outdoor air environment.

• 한국동물위생학회지
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• 제28권3호
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• pp.285-294
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• 2005

This study was conducted to investigate the extraction method for the determination of organochlorine, organophosphorus and synthetic pyrethroid pesticide residues in beef fat by gas chromatography-mass selective detector(GC-MSD). Twenty one pesticide residues in fat were determined using a simple and rapid procedure based on solid- phase extraction(SPE) clean-up cartridges with octadecyl $(C_{18})-bonded$ porous silica, florisil, $10\%$ deactivated florisil. a tandem $C_{18}$ and florisil and a tandem $C_{18}$ and $10\%$ deactivated florisil. Solvent-solvent extraction using acetonitrile was not satisfied to eliminate fat interference for pesticide residue analysis by GC-MSD, and the recoveries of the method in fat ranged from 16.2 to $57.3\%$ except DDT$(83.2\%)$. The recoveries of SPE methods using a tandem $C_{18}$ and Florisil was $59.6\~123.8\%$ except fenitrothion $(135.2\%)$. the SPE method was verified the satisfactory performance of pre-treatment for pesticide residues analysis in fat by GC-MSD. The efficiency of florisil deactivated with $10\%$ water has been not proved significantly on recoveries of pesticide residues in fat.

• 분석과학
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• 제8권3호
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• pp.375-381
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• 1995

간단한 용매추출 조작에 의한 콩나물에서의 Indole-3-acetic acid(IAA)분석에 관하여 연구하였다. 콩나물 재배시 성장촉진제로 사용되는 인돌비액제의 주성분인 IAA의 추출은 80% Acetone 100ml와 Methanol 50ml 혼합 용액으로 하였으며, 추출 농축된 시료를 14% $BF_3$/methanol로 methyl ester화하여 GC/MSD로 분석하였다. 본 분석방법의 회수율은 약 80%로서 우수하였으며, 이 분석방법을 이용하여 시중에 유통중인 포장 콩나물에서의 IAA분석을 시도하였다.

• Safety and Health at Work
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• 제11권2호
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• pp.222-227
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• 2020

Background: This study investigated the effect of increased job stress, caused by musculoskeletal disease (MSD) among firefighters, on a firefighter's intention to leave the profession, henceforth referred to as "turnover intention," and verified the moderating effect of mindfulness on such a relationship. Methods: A survey involving a total of 549 Korean male firefighters as participants was conducted herein, and the following results were obtained: the mediation effect of the MSD to turnover intention through job stress was confirmed, and the indirect effect of job stress was verified. Results: We verified the moderated mediation effect of mindfulness on the relation:MSD, job stress, and turnover intention. The conditional indirect effect for middle and high levels of mindfulness is significant. Conclusion: The result of this study is supported by proofs of the relationship between a firefighter's MSD, job stress, and turnover intention, and these case studies reveal the moderated mediation effect of dispositional mindfulness.

• 대한환경공학회지
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• 제35권2호
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• pp.75-83
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• 2013

본 연구는 기존의 고상추출(SPE) 과정을 분석장비인 LC/MSD에 on-line으로 연결함으로써 cartridge의 건조를 막아 target 물질의 손실을 최대한 억제하였으며 11종의 PFCs에 대해 실제 matrix가 있는 낙동강 원수를 이용한 실험에서 $80.4{\pm}5.2%{\sim}109.5{\pm}1.4%$ 범위의 높은 회수율을 구할 수 있었다. 낙동강에서의 PFCs 분포를 조사한 결과 하수처리장 방류수의 영향을 받는 지역(진천천과 금호강 하류)은 고농도의 PFCs가 검출되었으며, 낙동강 하류의 매리원수에서는 검출농도가 급격히 감소하여 PFOA만 8.0 ng/L의 농도로 검출되었다. 외국의 PFCs 검출현황을 보고한 연구결과들과 비교해 볼 때 낙동강 지류에서는 비교적 높은 농도로 PFCs가 검출되어 안심할 수 있는 수준은 아니었으며, 낙동강 본류의 경우도 여러 지역의 상수원으로 이용되기 때문에 주기적인 모니터링이 필요한 것으로 나타났다.

• Environmental Analysis Health and Toxicology
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• 제16권3호
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• pp.121-126
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• 2001

Analytical method of benzophenone (BP) in sediment and soil was developed by gas chromatography/mass selective detector/selected ion monitoring (GC/MSD/SIM). The ultrasonic extraction of US EPA (method 3550B) method and liquid-liquid extraction for sediment and soil samples were used for the analysis of BP from sediment and soil. BP was extracted with n-hexane. Organic layer was washed with 5% sodium chloride solution. 1∼2 l of the concentrated solution of organic layer was applied to GC/MSD. The retention time of BP peak was 11.10 min. Recovery (％) of BP by ultrasonication from sediment and soil samples was 96.0∼100.6％ and 40.0∼83.0％, respectively. Recovery of BP by liquid-liquid extraction was 51∼59％ in soil samples. The detection limit of BP in sediment and soil samples were determined to 0.1 ng/g.

• 분석과학
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• 제25권6호
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• pp.364-369
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• 2012

Isotianil은 쌀 도열병을 방제하기 위한 새로이 개발된 식물활성 살균제로 다른 식물활성제에 비해 소량으로도 장시간의 효과를 나타내는 특징을 가지고 있다. 신규 농약 Isotianil에 대한 기준은 국내의 경우 2010년 쌀에 대하여 0.1 mg/kg으로 최초 설정되었으며, 이에 따른 식품 중 안전관리를 위해 Isotianil을 분석하기위한 검사법을 개발하였다. 검체 일정량에 acetonitrile을 가하고 균질화하여 대상농약을 추출하였으며, 액-액분배하고 florisil 카트리지를 이용한 고체상 추출 후 GC-NPD 및 GC-MSD로 분석하였다. 분석결과 농산물에 의한 간섭물질은 없었으며, 대표 농산물 현미 등 6 종에 대한 Isotianil의 분석 시험법의 정량한계와 직선성은 각각 0.05 mg/kg과 0.999($r^2$)이었다. 회수율은 대표 농산물에서 70.0~103.9%이었으며, 분석오차는 10% 미만으로 CODEX 잔류분석 기준에 적합하였다.

• 대한인간공학회지
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• 제25권2호
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• pp.205-210
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• 2006

• 월간양계
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• 제45권11호
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• pp.112-115
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• 2013

1998년 인터베트코리아(주)가 설립되었고 2007년 인터베트와 쉐링푸라우 동물약품 사업부가 통합되면서 이후 2009년 MSD(Merck)와 합병하게 되었다. 3개 회사의 기원을 가진 MSD, 인터베트, 쉐링푸라우 동물약품 역사는 약 60년 전으로 거슬러 올라간다. 3개 회사는 각각 인간과 동물을 둘러싼 환경에서 생명을 위협할 수 있는 질병을 치료하기 위해 전문 지식과 확고한 의지를 가지고 새롭게 한국엠에스디동물약품 주식회사를 공식적으로 출범하였다. 새로운 비젼을 가지고 출발하는 한국엠에스디동물약품 주식회사를 찾아가 보았다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.987-990
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• 1998

An optical adder for a modified signed-digit(MSD) number system using joint spatial encoding method is proposed. In order to minimize the numbers of symbolic substitution rules, nine input patterns were divided into five groups of the same addition results. For recognizing the input reference patterns, masks and reference patterns without any other spatial operations are used. This adder is implemented by smaller system in size than a conventional adder.