• Nuclear Engineering and Technology
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• 제55권9호
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• pp.3202-3205
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• 2023

The k₀-standardization neutron activation analysis method has successfully determined the mass fraction of elements of interest using around a hundred analytical radionuclides. However, several very short-lived nuclides with half-life less than 100 s have not been used at Dalat research reactor. One of the reasons is that the values of k₀-factors of these nuclides are significantly different. Therefore, this work focused on re-determination and evaluation of k₀-factors of very short-lived nuclides ¹¹⁰Ag (T_1/2 = 24 s) and ^46mSc (T_1/2 = 18.75 s). The results of determination of the short-lived nuclides revealed that k₀-factor of ¹¹⁰Ag is significantly difference between the existing data and the obtained results in this work. The evaluation of the k₀-factors was done by using the obtained results for application of k₀-NAA for NIST-1566b and NIST-2711A standard reference materials.

• 복식
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• 제36권
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• pp.109-119
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• 1998

For the purpose of standardization and practicability of natural dyeing, the mordanting and dyeing properties of Caseaslpinia Sappan, L. and Brazilin were studied. Appropriate extraction, dyeing and mordanting condition of Caeaslpinia Sappan, L. were determined, and the effect of mordanting method on dye up-take adn color fastness of dyed fabric was investigated. The most absorbance of Caeaslpinia Sappan, L. solution was 445nm, Brazilin was 448nm. The color of bazilin solution was affected by pH 7~9. The optimum temperature to extract Caesalpinia Sappan, L. was 10$0^{\circ}C$ adn dyeing solution for 1 hour. In case mordants concentration, the most absorbance was 0.3%. In case mordanting test, the best and proper temperature to quantities of absorbed mordants in silk was 8$0^{\circ}C$ and the most quantities of absorbed mordants in silk was mordant treatment by Cu. Effective dyeing time to silk was 60min. Effective mordanting temperature was 8$0^{\circ}C$, and its time was 30min. K/S value of dyeing fabrics was recoginazed by mordanting treat-ment, specially Fe, Sn, Al, Cu. K/S value of pre-mordanting was higher than post-mordanting. After soaping treatment K/S value of pre- and post-mordanting silk was decreased and 0.1%(W/V) quantity of mordant was sufficient for treatment. In the case of Caeaslpinia Sappan, L. fastness was increased by mordanting treatment. Mordants and mordanting treatment method affected the amount of absorption and color change of dyed silk.

• 한국식품위생안전성학회지
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• 제23권3호
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• pp.206-211
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• 2008

식품의약품안전청 제2007-22호로 고시된 PSL-TL 검지법의 적용 가능성을 확인하기 위하여 국내에서 방사선 조사가 허가되어 있는 복합조미식품과 향신료를 대상으로 실시한 결과, 향신료의 조사되지 않은 1개 시료가 PSL 분석결과 중간시료로 분류되어 추가적으로 TL 분석을 실시한 결과 방사선 조사되지 않은 것으로 판단되었고, 나머지 조사되지 않은 시료들은 PSL 분석결과 음성시료로 판정되어 방사선 조사되지 않은 것으로 판단되었다. 방사선이 조사된 시료들은 PSL 분석에서 양성시료로 분류되어 추가적으로 TL 분석을 실시하여 glow curve가 나타나는 온도범위와 glow curve의 형태를 확인하고 TL ratio를 구한 결과, 방사선이 조사된 시료는 $150{\sim}250^{\circ}C$ 사이에서 아주 강한 강도의 glow curve를 보여주었고, TL ratio가 0.29이상을 나타내어 방사선 조사된 것으로 판단하였다. 따라서 PSL-TL 검지법의 적용가능성이 확인되었다.

• 대한임상검사과학회지
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• 제36권2호
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• pp.137-143
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• 2004

Erythrocyte sedimentation rate(ESR) measurements were performed in a total of 191 blood samples from patients below a hematocrit of 35% by both the Test-1(SIRE Analytical Systems, Udine, Italy) and the Westergren method, endorsed as the reference method for ESR by the International Council for Standardization in Hematology(ICSH). The corrected Westergren ESR values were also obtained applying the formula of Fabry (corrected ESR = ESR measured x 15/55-Hct). Linear regression analysis showed a close correlation (r=0.85) between the two methods both before and after ESR correction in total samples. There was no significant correlation difference between two methods in both two groups with hemoglobin $${\geq_-}9g/dl$$ and <9g/dl before and after ESR correction (r=0.873, r=0.827 respectively before correction and r=0.867, r=0.830 respectively after correction). Also, for two groups with hematocrit $${\geq_-}24%$$ and <24%, no significant difference was observed (r=0.859, r=0.792 respectively before correction and r=0.782, r=0.842 respectively after correction). However, for samples with <60mm of Westergren ESR before correction, a better correlation coefficient was obtained than samples with $${\geq_-}60mm$$(r=0.701, r=0.541 respectively). In corrected Westergren ESR, also samples that were obtained with <40mm showed better correlation than samples with $${\geq_-}40mm$$ (r=0.690, r=0.347 respectively). In conclusion, we found a good correlation between Test-1 and Westergren measurements in patients with anemia but an expert group discussion is required to solve discrepancy between two methods in blood samples with very high ESR.

• 생약학회지
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• 제32권2호통권125호
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• pp.153-156
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• 2001

The methods for isolation and quantitative determination of dioscin, a spirostanol triglycoside, from the roots of Smilax china have been developed. Isolation of dioscin was achieved by silica gel and RP-18 chromatography. The HPLC method used for quantitative determination of dioscin enabled the standardization of the crude drug. It suggests that the content of dioscin in Smilax china should be above 0.01%.

• 서비스연구
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• 제3권2호
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• pp.33-44
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• 2013

인터넷과 모바일 서비스의 증가로 유무선 웹 콘텐츠 서비스 이용이 증가하고 보다 다양한 콘텐츠 수요가 발생하고 있다. 경쟁력 있는 콘텐츠를 제공하는 웹사이트로 살아남기 위해 그리고 접근성, 웹표준에 대한 기술적 오류를 없애고 콘텐츠 이용률이 높은 사이트가 되기 위해서는 마케팅 및 캠페인과 같은 이벤트도 필요하지만 무엇보다도 정기적인 사이트 평가를 통하여 문제점을 진단하고 이를 해결하는 노력이 요구된다. 본 논문에서는 웹콘텐츠 서비스를 제공하는 사이트 평가 방법을 크게 정량적 방법과 정성적 방법으로 구분하여 제시하고 정량적 방법의 타당성을 검증하기 위해 국내 138개 홈페이지에 대한 평가 결과를 분석하였다. 정량평가를 위하여 접근성, 표준성 및 이용성 항목으로 구분하고 접근성은 K-WAH(Korea-Web Accessibility Helper)를 이용하여 인식 운용 이해의 용이성 및 기술적 진보성 항목에서의 오류수를 진단하고 표준성은 W3C Validator를 이용하여 웹표준의 오류 및 경고수를 분석하며, 이용성은 구글 애널리틱스를 이용하여 사용자 방문수, 평균 방문시간, 이탈률 등을 평가한다. 그리고 웹사이트에 대한 비용(구축 및 운용비)을 고려하여 정량평가와 비용 사이의 상관관계를 분석한다. 분석 결과, 100점 만점으로 환산하였을 때, 평균 55점, 표준편차 14점으로 평가되었으며 정량평가 점수와 비용 사이에는 양(+)의 상관관계가 존재하나 상관계수는 0.058로 그다지 높지 않음을 알 수 있다.

• 기술사
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• 제16권3호
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• pp.5-23
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• 1983

On the Seoul Metropolitan Subway Construction of No. 3, 4 Line, the total length is 57 Km and it is now undergoing almost 55％ progress. The working method is classified into Open Cut of 70% and the rest of 30% tunnelling method in the 48 job site. Above tunnelling method is execute by American Steel Support System and the rest of 10 job site carried out by New Austria Tunnelling Method. This paper describes Blasting Standardizations works on the above Tunnelling ' Open Cut Method under big slogan, first safety, second execution. As a superintendent, I strived standardization of works with Better powder, Better Drills ' Better Pattern. Geological structure of Seoul area is composed by Jurassic Granite and also the above rockgroup are over burden by Alluviums as a Unconformity. First of all, I carried out the standard amount of powder and burden through experimental standard blasting by each powder as following Blasting works in the subway construction is surrounding shop Building, under pass the city river and also under pass highest building basement floor. I made allowable Blasting Vibration Value by West-Germany Vornorm DIN 4150, Teil 3 and should measure each blasting works as fellows all of powder is used basically Low-Gravity and Low Velocity such as Slurry, Ammonium Nitrate ' Finex I, II. for Smooth Blasting Instead of Gelatin Dynamite. Electric Detonation Cap is used basically M/S Delay Cup instead of Electric delay ' Simultaneous cap. I applied following formula V=KW3/4 $D^{-2}$ V=Particle Velocity (Cm/sec) K=Ginh Huh's Value W=Delay Charge (Kg) D=Distance(m) In the Open Cut, within 1m distance from H-pile I made to use the Concrete breaker, as following V=7W/$^{0.5}$V/$^{-1.75}$ On the Concentrate Building area, I advise to use Light class drill ø36m Bit and advance 1.1m per round blasting the three boom jumbo drill over ø45mm used only suburb of city.e Light class drill ø36m Bit and advance 1.1m per round blasting the three boom jumbo drill over ø45mm used only suburb of city.

• Natural Product Sciences
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• 제22권2호
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• pp.77-81
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• 2016

A reversed-phase high-performance liquid chromatographic method is described for the simultaneous determination of three antibacterial flavonoids, artocarpanone, artocarpin, and cycloartocarpin in ethyl acetate extracts from Artocarpus heterophyllus heartwoods. Separation was achieved using a TSK-gel ODS-80Tm column ($5{\mu}m$, $4.6{\times}150mm$) at $25^{\circ}C$ with a gradient elution system of methanol and water as follows: 0-8 min, 60:40; 8-27 min, 80:20; 27-35 min, 60:40, v/v, at a flow rate of 1 mL/min, and a quantitative UV detection at 285 nm. The method was validated by measuring the key parameters, including specificity, linearity, sensitivity, accuracy, repeatability and reproducibility. A high degree of specificity and sensitivity was achieved. The calibration curves for all three flavonoids showed good linearity with a coefficient of determinations ($R^2$) of ${\geq}0.9995$. The recoveries of the method were from 98-104%, with good reproducibility and repeatability (RSD values of less than 2%) were also achieved. Ethyl acetate was the best solvent for extraction of these three flavonoids using the heat reflux conditions for 1 h. This optimized sample preparation and HPLC method can be practically used for a routine standardization process of the extracts from the A. heterophyllus heartwoods.

• 대한안전경영과학회지
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• 제17권1호
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• pp.119-124
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• 2015

According as radiation therapy technique develops, standardization of radiation therapy has been complicated by the plan QA(Quality Assurance). However, plan QA tools are two type, OADT (opposite accumulation dose tool) and 3DADT (3 dimensional accumulation dose tool). OADT is not applied to evaluation of beam path. Therefore tolerance error of beam path will establish measurement value at OADT. Plan is six beam path, five irradiation field at each beam path. And beam path error is 0 degree, 0.2 degree, 0.4 degree, 0.6 degree, 0.6 degree, 0.8 degree. Plan QA accomplishes at OADT, 3DADT. The more path error increases, the more plan QA error increases. Tolerance error of OADT path is 0.357 using tolerance error of conventional plan QA. Henceforth plan QA using OADT will include beam path error. In addition, It will increase reliability through precise and various plan technique.

• Journal of the Korean Academy of Child and Adolescent Psychiatry
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• 제27권2호
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• pp.109-118
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• 2016

Objectives: The aim of this study was to develop the computerized Comprehensive Learning Test-Reading (CLT-R) to evaluate the cognitive processes and achievements related to their basic reading ability and identify dyslexia in children and adolescents in South Korea. We also obtained the normative data and evaluated the reliability and validity of the test. Methods: We developed the CLT-R, including the word attack/nonword decoding, paragraph reading, sound blending, nonword repetition, rapid automatized naming, letter-sound matching, visual attention, orthography awareness, and digit span tests, for the purpose of diagnosing dyslexia. We investigated the reliability and validity of the tests and gathered the normative data from 399 subjects (male 48.9%), aged 5-14 years, from the last grade in kindergarten to middle school, dwelling in Seoul and Gyeonggi Province, South Korea. Results: No statistical differences were observed between the means of the tests and retests of the CAT. The mean of the correlation coefficient of the test-retest scores was 0.85. According to the construct validity test calculated by principal constant analysis using the oblique rotation method, 4 factors explained 70.0% of the cumulative variances. In addition, the normative data were obtained for all of the CLT-R subtests. Conclusion: The computerized CLT-R can be used as a reliable and valid tool to evaluate the reading achievement and reading related cognitive process in Korean children and adolescents in schools, clinics, and research institutes.