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허옥순,이재관,이정성,서정혁,주인선,허수정,김세은,김정근,신영희,유미자,김지연,심규창,김성환 식품의약품안전청 1998 식품의약품안전청 연보 Vol.2 No.-
신속 · 정밀하고 효율적인 짠류농약 검출을 위하여 극싱칼럼 (Extrelut-3')을 사옹한 SPE법을 시도하였다. 시료는 채소류체 사용하는 농약중 잔류성이 있고 식품공전상 시험 전처리가 각각 다른 Chlorothalonil등 6종의 농약을 선정하고 그들 표준액에 대한 PPIR수준의 농도로추출용라의 종류 및 용매량 등의 추출조건을 달리하여 회수율 등을 측정한 결과 최적의 분석조건을 얻었다. 1) 추출 용매량은 증가할수록 추출 수율이 높았고,용매 종류에 대한 추출수율은 각 농약별로 다소 차이는 있었으나 극성 정도가 비교적 높은 Ethyl acetate애서 평균 추출수율이 가장 높았다 2) 최대 평균회수율은 Ethyl acetate 60mL를 사웅할 경우로서 93.6%였다. 3)표준액을 시료에 첨가한 시험에서도 역시 Ethyl ace늘to가 푼출수율이 가장 높았으며 불순물 분리제거 효과도 LLE법 보다 월등히 우수하였다. 4) 각 농약별 검출한계는 치소 0.001ppin으로 농산물 중 미량 잔류하는 농약을 검출할 수 있을 것으로 사료된파. 그러므로 SPE법은 LLE법보다 경제적인 방법으로 판명되었으며, 앞으로 농산물 중 잔류농약 분석에서 LEE법을 대치할 쑤 있을 것으로 기대된다. Solid-phase extraction by polar column(Extrelut-3') was attempted to develope the fast and efficient method of detecting pesticide of farm product.5·ix kinds of pesticide used in farming fieldfrequently and different in pretreatment, were chosen from Korea Food Cord. Optfmal analysis condi-tions were determiBed from t31e recovery rate of standard pesticides according to extraction solvent andextraction volurae. Extraction yietd was increased as solvent polarity and extraction volume. Maximumrecovery rate was acquired at 93.6% when 60mL of ethyl acetate was used as eluent. Tllis method wasmore effective than liquid-liquid partition extract·ion method to eliminated the impurity and had 0.001ppm of detection limit. Therefore. solid-phase eEl=raction was expected to be economical substitute fortraditional liquid-liquid extT·action method.
ON THE SOLUTION AND STABILITY OF A GENERALIZED QUADRATIC FUNCTIONAL EQUATION
LEE, YOUNG WHAN,LEE, JI YEON,KIM, GAWNAG HUI,SHIN, DONG-SOO 江南大學校産學技術硏究所 2004 산학기술연구소논문집 Vol.- No.18
In this paper we solve a generalized quadratic functional equation 25f(x+y+z/5)+f(x)+f(y)+f(z)=9[f(x+y/3)+f(y+z/3)+f(z+x/3)]and prove the stability of this equation in the spirit of Hyers, Ulam, Rassias, and Gaˇvruta.
STABILITY OF A JENSEN FUNCTIONAL EQUATION WITH THREE VARIABLES
Lee, Eun-Hwi,Lee, Young-Whan,Park, Sun-Hui 한국전산응용수학회 2002 Journal of applied mathematics & informatics Vol.10 No.1
In this Paper we show the Solution of the following Jensen functional equation with three variables and prove the stability of this equations in the spirit of Hyers, Ulam, Rassias and Gavruta: (equation omitted).
비정맥류, 비궤양성 장관 내 출혈 및 용종 제거술 후 내시경적 밴드 결찰술
이정환,김유선,김은순,배원기,우광훈,문정섭,유권,전영빈,류정임,선휘경,하근우 대한소화기내시경학회 2001 Clinical Endoscopy Vol.23 No.2
Background/Aims: There is no consensus as to the best treatment for non-variceal, non-ulcer gastrointestinal hemorrhage. Endoscopic band ligation is an inexpensive, readily available, and easily learned technique in contrast to conventional thermal methods of endoscopic hemostasis. The purpose of this study is to define the effectiveness of endoscopic band ligation for non-variceal, non-ulcer gastrointestinal hemorrhage and post-polypectomy hemorrhage. Methods: Twenty eight patients were treated by band ligation between July 1996 and October 2000. The lesions treated were; Dieulafoy’s lesion in 13, Mallory-Weiss tear in 7, angiodysplasia in 1, post-polypectomy bleeding in 4, post-endoscopic mucosal resection bleeding in 2, post- endoscopic biopsy bleeding in I. Results: Endoscopic band ligation was successful in 25 of 28 cases. Additional sclerotherapy was necessary in two cases of Dieulafoy’s lesion. The remaining case was early band detachment. Conclusions: Endoscopic band ligation is effective for non-riceal, non-ulcer bleeding. It has the advantage of ease of use and is relatively inexpensive.
On the Hyers-Ulam-Rassias Stability of a Quadratic Functional Equation
Lee, Young-Whan,Park, Sun-Hui 한국전산응용수학회 2002 The Korean journal of computational & applied math Vol.9 No.1
In this paper we obtain the general solution of a quadratic Jensen type functional equation : (equation omitted) and prove the stability of this equation in the spirit of Hyers, Ulam, Rassias, and Gavruta.
Approximate Jordan mappings on noncommutative Banach algebras
Lee, Young-Whan,Kim, Gwang-Hui Korean Mathematical Society 1997 대한수학회논문집 Vol.12 No.1
We show that if T is an $\varepsilon$-approximate Jordan functional such that T(a) = 0 implies $T(a^2) = 0 (a \in A)$ then T is continuous and $\Vert T \Vert \leq 1 + \varepsilon$. Also we prove that every $\varepsilon$-near Jordan mapping is an $g(\varepsilon)$-approximate Jordan mapping where $g(\varepsilon) \to 0$ as $\varepsilon \to 0$ and for every $\varepsilon > 0$ there is an integer m such that if T is an $\frac {\varepsilon}{m}$-approximate Jordan mapping on a finite dimensional Banach algebra then T is an $\varepsilon$-near Jordan mapping.