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쪽파[Allium ascalonicum L.] 재배기간 중 Diazinon, Iprodione 및 Chlorfenapyr의 잔류랑 변화
고광용,나은식,김성헌,김상준,장영희,이규승 충남대학교 농업과학연구소 2005 농업과학연구 Vol.32 No.2
In order to know the residual pattern of pesticides and predict to the degradation period until below MRL, we experimented diazinon, iprodinon and chlorfenapyr for shallot. They were the most detected pesticide in shallot by NAQS (National Agricultural product Quality management Service) survey. In this experiment, we sprayed those pesticides 15days before harvest and analyzed 0, 1, 2, 3, 5, 7, 10, 14 day sample to establish logical equation and to calculate DT_(50). During the cultivating period, the residue amount of diazinon was changed from 1.02 mg/kg (0 day) to 0.01 mg/kg (14 day), DT_(50) was 2.19 days, and iprodione was changed from 1.45 mg/kg (0 day) to 0.14 mg/kg (14 day), DT_(50) was 4.15 days, and chlorfenapyr was changed from 1.5 mg/kg (0 day) to 0.01 mg/kg (14 day), DT_(50) was 1.97 days. The DT_(50) of double amount in those pesticides, diazinon was 2.24 days, iprodione was 4.82 days, and chlorfenapyr was 2.24 days, respectively.
역할실험실을 위한 새로운 Air Table의 설계 및 실험방법
이계도,이희복,김용복 공주대학교 사범대학 과학교육연구소 1996 과학교육연구 Vol.27 No.1
고등학교와 대학교의 물리실험실에서 사용하고 있는 기존의 기록 타이머는 1차원 운동을 정확하게 기록할 수 있으나 2차원 운동은 기록할 수 없다. 본 연구에서는 1차원 운동뿐만 아니라 2차원 운동을 정량적으로 기록하여 실험결과를 분석할 수 있는 새로운 Air Table장치와 이를 사용한 역학 실험방법을 개발하였다. 본 장치를 사용하여 할 수 있는 실험은 1차원 운동, 운동의 제2법칙, 2차원에서의 포사체 운동, 충격량과 선운동량 보존, 각운동량 보존, 일-에너지 정리 등이다. The conventional recording timer which has been using at the physics laboratory of high schools and colleges gives a precise trace of one dimensional motion. However, it can not be used to get a trace of two dimensional motion. In this study, we have developed new air table and experimental procedures for the mechanics laboratory to analyse quantitatively the data obtained from one dimensional motion, the second law of motion, the projectile the data obtained from one dimensional motion, the second law of motion, the projectile motion in two dimensions, the impulse and linear momentum, the conservation of the linear momentum, the conservation of the angular momentum, and the work-energy theorem, etc.
田啓石,丁寬秀,金容平 慶熙大學校 1980 論文集 Vol.10 No.-
In X-band, a edge-guided(EG) mode microstrip isolator is designed in which nonreciprocal attenuation is due to the ferromagnetic resonance absorption caused by a strong d-e magnetic field applied locally at the shorted edge of a ferrite microstrip. From modal analysis. the dominant EG mode has been shown to propagate alone the microstrip with one edge shorted to the ground plane. Dispersion relations and rf electric field distributions have been calculated numerically. And the upper limit and the cutoff frequency of band width have been discussed with several design parameters. A practical EG-mode microstrip isolator based on these results has been successfully designed, which has more than 25dB isolation.
한국판 Edinburgh Postnatal Depression Scale의 임상적 적용
김용구,허지원,김계현,오강섭,신영철 大韓神經精神醫學會 2008 신경정신의학 Vol.47 No.1
Objectives : The EPDS (Edinburgh Postnatal Depression Scale) is a lO-items self-report scale designed as a specific instmment to detect postnatal depression by Cox et al. (1987). This study was to determine the optimal cut-offpoint ofthe K-EPDS for postpartum depression in Korea. Methods : The 239 pregnant women assessed their own psychiatric features with the Korean version of the Edinburgh Postnatal Depression Scale (K.-EPDS), Beck Depression Inventory (BDI), Beck Anxiety Inventory (BAI), Rosenberg Self-Esteem Scale (RSES) and Marital Satisfaction Scale (MSS) at 6 months ofpregnancy, 1 week after delivery, and 6 weeks after delivery. Subjects above 9 points of K-EPDS at 6 week after delivery were interviewed with Structured Clinical Interview for DSM-IV Axis I Disorders (SCID-I) to confirm postpartum depression. Results : The prevalence of postpartum depression was 12.6% (30/239 pregnant women) in our study. The total scores of K-EPDS at 6 weeks after delivery were higher significantly than those of nonnal group. The score gap of K-EPDS between the depressed pregnant group and the normal pregnant group was increased after the delivery. However, there were no differences in the epidemiological characteristics and the BDI scores at 6 weeks after delivery between groups. Using the AUC (area under the curve), the optimal point to assess the postpartum depression was revealed as 6 weeks after delivery (AUC=85.8%) or 24 weeks of pregnancy (83.7%). The cut-offpoint of K-EPDS to detect postpartum depression among pregnant women was 9/10score of K-EPDS (AUC= 81.8%). Conclusion : In the K-EPDS, cut-off score of 9/10 was optimal to assess the postpartum depression, and K-EPDS at 6 weeks of delivery was more useful than any other point of time. K-EPDS administrated during pregnancy may be a useful tool to find the vulnerability on the postpartum depression.
MSPD법과 HPLC를 이용한 계란내 플루오로퀴놀론계 항균물질의 동시 다성분 정량분석
서계원,이재일,이채용,김은선,이정치 한국수의공중보건학회 2002 예방수의학회지 Vol.26 No.4
A multi-residue matrix solid-phase dispersion extraction and the liquid chromatographic determination of enrofloxacin, ciprofloxacin, norfloxacin and ofloxacin in eggs is described. Blank and fluoroquinolones fortified egg samples (0.5 g) containing oxalic acid 0.05 g and sodium sulfate (anhydrose) 0.5 g were blended with octadecylsilyl (C_(18), 40 m, 18% load, endcapped, 2 g) derived from silica. After homogenization, C_(18)/egg matrix was transferred to column made of 10 ml plastic syringe and filter paper, and compressed 4.0 4.5 ml volume. A column was washed with 8 ml of hexane followed by 8 ml of ethylacetate and dried under N2 gas. Fluoroquinolones were eluated with 8 ml of methanol under gravity. The eluate contained fluoroquinolones, was free from interferences when analyzed by high performance liquid chromatography with fluorescence detection. Correlation coefficients for the fluoroquinolones standard curves (linear regression analysis, n = 5) ranged from 0.99918 (± 0.0035) to 0.99985 (± 0.0002). Aveage recoveries of fortified samples were between 89.4 and 103.5%. The method comparared favorably with the classical method in terms of the sample size, analysis time and overalls costs.
HL-60 세포 분화유도증 c-Myc 발현에 대한 세포분화유도제의 영향
이용진,곽상태,김계영,이명선,권기량,임규,황병두 충남대학교 의과대학 지역사회의학연구소 1993 충남의대잡지 Vol.20 No.2
Effects of the differentiation inducers on DNA synthesis and c-myc gene expression have been investigated during the differentiation of human promyelocytic leukemia cell line HL-60. All-trans retinoic acid(retinoic acid) and dimethyl sulfoxide(DMSO) decreased DNA synthesis at 24 hours and 12-O-tetradecanoylphorbol 13-acetate(TPA) decreased at 12 hours after exposure, respectively. On the other hand control, no adding differentiation inducers, gradually increased DNA synthesis. The c-myc mRNA was sharply reduced at 24 hours in retinoic acid-, at 4 hours in DMSO-, and at 1 hour in TPA-exposured HL- 60 cells. The level of c-myc mRNAs was reduced in proportion to the concentration in all of three differentiation inducers. The level of c-myc mRNAs in the differentiation inducers-exposured cells were elevated by cycloheximide treatment. These results suggest that c-myc gene expression and differentiation mechanism are variable according to the kinds of the differentiation inducers in HL-60 cells.