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HPLC-ICP/MS 와 ICP/MS를 이용한 FAPAS 07187 쌀의 총비소, 무기비소, 카드뮴 측정
노현명 ( Hyun Myung Noh ),김지영 ( Ji Young Kim ),김원일 ( Won Il Kim ),( Anitha Kunhikrishnan ),김민지 ( Min Ji Kim12 ),김경진 ( Gyeong Jin Kim ),박기문 ( Ki Moon Park ),류지혁 ( Ji Hyock Yoo ),김두호 ( Doo Ho Kim ),이영자 ( Y 한국환경농학회 2013 한국환경농학회 학술대회집 Vol.2013 No.-
Metal (loid)s such as environmental contaminants affect food safety. Metal (loid)s exist trace extremely in agriculture products. Therefore it is important to analyze accurately about trace these metals. High resolution techniques and quality controls are needed to analyze these materials. In order to achieve quality results, standardized methods and techniques are required. So ISO(International Organization for Standardization) of laboratory proficiency testing is determination of laboratory testing performance by means of inter-laboratory comparison. The values have been derived as a consensus of a number of laboratories using a variety of methods. Proficiency tests were applied to analyze the metal(loid)s [inorganic arsenic (As), total As and cadmium (Cd)] in powdered rice FAPAS 07187 (Food Analysis Performance Assessment Scheme; February-April 2013). The rice powder sample was extracted with 1% HNO3 for inorganic As for microwave-assisted extraction using water at 95℃ for 90 min and their analysis by HPLC/ICPMS. Also, HNO3 for total As and Cd using microwave-assisted extraction using at 200℃ for 50 mins and analysis by ICP/MS. Validation check was performed for accuracy using CRM (NMIJ CRM 7503-a) for inorganic As, and CRM (IRMM-Rice CRM) for total arsenic and cadmium. The result were satisfactory. FAPAS 07187 the z-scores of inorganic As, total As and Cd in powdered rice were-1.8,-0.9 and 0.2(lzl<2, respectively).
단열재가 극저온 용기의 내부지지대 구조설계에 미치는 영향
김두호,지현진,김기열,조성백,Kim, Doo-Ho,Ji, Hyun-Jin,Kim, Ki-Youl,Cho, Sung-Baek 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.3
The cryogenic vessel, storing a liquified solutions as LOX and $LN_2$, consists of a external vessel, internal vessel, thermal insulator and internal support. The internal support should be satisfied with mechanical strength not only to support weight of internal tank but also to maintain uniform space between external and internal tank in spite of external mechanical shock. However, excessive structure design of internal supports is able to increase the amount of heat conduction and the rate of vaporization. The thermal insulator, filled with space between a external and internal vessel, reduces the rate of heat transfer and guarantees the standing time of cryogenic vessel. Especially powder type of insulator has low thermal conductivity and reduce the specification of structure design. In order to evaluate the effect of insulator on structure design, the experiment set-up simulated cryogenic vessel was tested in shock environment according to thermal insulator. As a result, the behavior of internal support under external shock was understood and the design criteria was able to be suggested.
장기재령에 따른 판형 & H형강 내화뿜칠재의 내화성능에 관한 실험적 검토
김두호(Kim Doo-Ho),이종찬(Lee Jong-Chan),윤상혁(Yoon Sang-Hyuck),이세현(Lee Sea-Hyun) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.9
This study was intended to evaluate the long-term durability and develop the maintenance of fireproof spray coat. To that end, density and adhesion of fireproof spray coat on plate girder and H-beam at normal temperature were measured and the relationship with fire resistance performance was evaluated. The specimen was fabricated by spraying the coat on plate girder and H-beam and remained at normal temperature for 2 years. As a result of measuring the density of spray coat, the density was rapidly reduced in line with vaporization within 15 days and showed very little change to density since then. When it comes to adhesion over a long-term period, adhesion of 52.2% of vermiculite material appeared to increase in 2 years, while 44.8% of plaster material showed increased adhesion, indicating higher increase by vermiculite than plaster material. And as a result of reviewing adhesive strength and fire resistance performance, the higher the adhesion, the lower the heating temperature, indicating it's inverse proportion to fire resistance performance. The test proved that the fire resistance performance of the specimen on plate girder and H-beam became deteriorated over the time and as a result of comparing and reviewing the highest temperature after an 1-hour fire resistance test, spray coat with vermiculite material indicated the temperature 20℃higher on plate girder and the spray coat with plaster material also indicated the temperature range 10℃ higher on plate girder.
알루미노 실리케이트계 내화보드의 내화성능 및 현장적용성 평가
김두호 ( Doo Ho Kim ),박동철 ( Dong Cheol Park ),김우재 ( Woo Jae Kim ),이세현 ( Sea Hyun Lee ) 한국건축시공학회 2010 한국건축시공학회 학술발표대회 논문집 Vol.10 No.1
The use of high-strength concrete has increased for its excellent structural stability as buildings become higher and bigger than ever before in Korea and overseas recently. The functional requirement of building materials has also been bolstered so for the high -performance, high-quality construction materials to be used more extensively. However, the internal structure of the high-strength concrete is very dense so spalling can be caused during fire. The spalling in turn can cause critical structural damages followed by the fatal consequences, demolition of the building. Therefore, ensuring fire safety for high-rise buildings is assumed to be urgent. Alumino-silicate fire resistant board producing technology has been developed in situations that new materials with excellent fire resistance and easy installation has been sought. The alumino-silicate fire resistant board turned out to exhibit not only fire resistance and excellent physical and dynamical characteristics but also excellent onsite applicability and easy process and transportation after completing Mock-up test. Its excellence as a high-performance building materials was proven.