• Proceedings of the Korea Air Pollution Research Association Conference
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• 1999.10a
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• pp.385-386
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• 1999

국내에서도 대기중 VOC 측정이 정부 차원에서 각 지역별로 이루어지도록 법적 시행이 2000년부터 이루질 예정이다. VOC 분석에서 가장 필요한 것은 VOC분석용 표준물질인데 이는 매우 고가로서 모두 수입에 의존하고 있다. 본 연구에서는 앞으로 시행된 대기중 VOC 측정 대상 화합물중 10개의 HAP(hazardous air pollutant) target화합물이 함유된 저농도 ppb level의 HAP CRM을 개발하였다.(중략)

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2007.11a
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• pp.237-238
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• 2007

• Proceedings of the KSEE Conference
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• 2004.08a
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• pp.127-149
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• 2004

건설교통부 표준발파패턴 중 암파쇄굴착공법(pattern-1)에 해당하는 구간에서 적용할 수 있는 공법중의 하나로서 새로운 물질과 반응촉발장치를 이용하는 파암공법이다. 본 공법에 대한 이해를 돕기 위해 새로운 물질의 특성시험, 파암진동과 발파진동과의 비교 고찰하고, 각종 화약류와의 폭발소음을 비교분석 하였으며, 본 공법을 파암현장에 적용함에 있어 암질에 따른 설계기법 및 시공방법 등에 대해 연구하였다.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2000.04a
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• pp.321-322
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• 2000

대기중의 유해 유기오염물질의 배출농도를 규제하는 법규와 표준지침이 제정되어 있으나 시료채취와 분석까지 시간이 많이 걸려 빠른시간내 확인하기엔 어려운 실정이다. 특히 악취성 휘발성 유기물은 오염발생이 순간적으로 일어나 이를 신속하게 규명하지 않으면 원인 규명이 어려운 실정이다. 본 연구에서는 이동형 FT-IR을 사용하여 대기중에 존재하는 유해 유기오염물질의 신속하게 분석할 수 있는 분석법을 확립하고자 하였다. (중략)

• 한국지구과학회:학술대회논문집
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• 2010.04a
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• pp.117-117
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• 2010

외뿔소자리 신성 1975는 발견 당시에는 백색왜성과 적색왜성의 근접쌍성계인 것으로 알려졌으나, 엑스선 관측과 그에 따른 표준 정류 상태 원반 모형에 근거한 해석으로 중성자별 또는 블랙홀의 가능성이 대두되었다. 곧이어, 광학관측에 의하여 블랙홀 이중성임이 간접적으로 동정되었다. 최근 들어 1975젼 당시의 많지 않은 전파 관측 자료들을 재해석하여 상대론적인 물질 분출 현상, 즉 마이크로퀘이사 현상이 있었을 가능성이 관측적으로 제시되었다. 우리는 시간 종속적 열적 불안정성 모형을 바탕으로 수치모형을 계산하여 관측적으로 제시된 물질분출의 가능성을 이론적으로도 제시할 수 있음을 보인다

• Korean Journal of Food Science and Technology
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• v.39 no.4
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• pp.360-365
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• 2007

The studies for the derivatization of 3-monochloropropane-1,2-diol (3-MCPD) were performed mainly as acylation with HFBI (heptafluorobutyrylimidazole), alkylation with PBA (phenylboric acid) and silylation with BSTFA (N,O-bis[trimethylsilyl]trifluoroacetamide). Also silylation with MTBSTFA(N-methyl-N-[tert.-butyldimethylsilyl] trifluoroacetamide) and acylation with MBTFA (N-Methyl-bis[trifluoro-acetamide]) were also considered. Except the TBDMS derivative of 3-MCPD, all the derivatives were detected well. The derivatives of 3-MCPD with HFBI, PBA and BSTFA showed below 10 ${\mu}g/kg$ which was sensitive enough to satisfy Korea maximum residue limit 0.3 mg/kg. Among the tested adsorbents, Extrelut20 and Florisil were evaluated as the proper adsorbents to eliminate the soy sauce matrix for 3-MCPD. Ethyl acetate was the most efficient eluent with good recovery rate. The desired surrogate compound and internal standard were 1,2-butanediol and 1,2-dibromo-3-chloropropane, respectively. The limit of detection for PB-MCPD and TMS-MCPD were 10.16 and 7.06 ${\mu}g/kg$ on GC/MSD, respectively. HFB-MCPD derivative showed the lowest detection limits 2.98 and 5.32 ${\mu}g/kg$ by GC/ECD and GC/MSD, respectively.

• Journal of Practical Agriculture & Fisheries Research
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• v.26 no.2
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• pp.31-40
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• 2024

This study was indicated that both potato leaves and stems contained certain amount of alkaloids compounds which digested in the rumen of Hanwoo steers. Three candidate plant byproducts such as potato, tomato, and eggplant were collected and dried for making feed additives. Among the candidate byproducts, potato extract was contained 2.05±0.27mg/g of α-chaconine and 0.60±0.08mg/g of α-solanine. These glycoalkaloids was potentially activated as functional compounds to skeletal muscle in beef cattle. However, tomato and eggplant byproducts were not detected any alkaloids compounds. After potato byproducts collected and dried for 24 hours, dry matter of potato byproduct were used as feeding study for evaluating active dose titrations. For evaluating dietary rate of rumen microbes, potato dry matter were treated with in situ hybridization for 72 hours using annulated Hanwoo steers. The glycoalkaloids contained potato dry matter were digested until 12 hours after treatment. Blood concentration of glycoalkaloids were not detected after 24 hours treatment of potato dry matter. These data indicated that potato byproduct were digested with rumen microbes for 24 hours after treatments.

• Korean Journal of Food Science and Technology
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• v.41 no.3
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• pp.258-264
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• 2009

The principal objective of this study was to estimate the measurement uncertainty associated with determination of deoxynivalenol (DON), a mycotoxin generated by Fusarium strain, in food. In service of this goal, wheat as a food matrix was analyzed via high performance liquid chromatography-ultraviolet (HPLC-UV) detection using an immunoaffinity column for clean-up. The uncertainty sources in the measurement process were identified by sample weight, final volume, and sample concentration in extraction volume with components including standard stock solution, working standard solution, 5 standard solutions, calibration curve, matrix, and instrument. The expanded uncertainty for DON at a concentration of 300 ${\mu}g/kg$ was estimated as 71.62 ${\mu}g/kg$ using a coverage factor of two, which provides a confidence level of approximately 95%. The most influential component in the uncertainty sources was the recovery of the wheat matrix, followed by the calibration curve. These results indicate that all efforts may be directed toward reducing the uncertainties of the recovery of the wheat matrix and the calibration curve to obtain a reliable HPLC-UV method for DON analysis in wheat.

• Analytical Science and Technology
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• v.23 no.3
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• pp.284-294
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• 2010

In this study, river water-based reference materials (RMs), NIER-I08RW and NIER-I09, for trace metal analysis were prepared and certified for Pb, Cd, Cr and Cu with evaluation of uncertainties. The RMs were confirmed to be homogeneous enough to be used as proficiency testing materials since within-bottle homogenieties of the RMs were lower than 0.3 times of targeted standard deviation of proficiency testing. The RMs were distributed to environmental testing laboratories for the proficiency testing and the variation of Z scores of the proficiency testing results were compared for different assigned values. The relative bias, $B_{relative}$, deviations between reference values and consensus values, were lower than ${\pm}$1 except for cadmium of NIERI08RW. The results showed both values were in a good agreement and only 2.9% of Z scores changed by using a different assigned values such as consensus and reference values.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.15 no.2
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• pp.101-116
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• 2017

The interaction of U(VI) (hexavalent uranium) species with natural organic matter (NOM) in KURT (KAERI Underground Research Tunnel) groundwater is investigated using a laser spectroscopic technique. The luminescence spectra of the NOM are observed in the ultraviolet and blue wavelength regions by irradiating a laser beam at 266 nm in groundwater. The luminescence spectra of U(VI) species in groundwater containing uranium concentrations of $0.034-0.788mg{\cdot}L^{-1}$ are measured in the green-colored wavelength region. The luminescence characteristics (peak wavelengths and lifetime) of U(VI) in the groundwater agree well with those of $Ca_2UO_2(CO_3)_3(aq)$ in a standard solution prepared in a laboratory. The luminescence intensities of U(VI) in the groundwater are weaker than those of $Ca_2UO_2(CO_3)_3(aq)$ in the standard solution at the same uranium concentrations. The luminescence intensities of $Ca_2UO_2(CO_3)_3(aq)$ in the standard solution mixed with the groundwater are also weaker than those of $Ca_2UO_2(CO_3)_3(aq)$ in the standard solution at the same uranium concentrations. These results can be ascribed to calcium-U(VI)-carbonate species interacting with NOM and forming non-radiative U(VI) complexes in groundwater.