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- 저자 : Keum-Dong Jung (검색결과 164 건)
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琴東赫,鄭春植,朴勝濟 成均館大學校 科學技術硏究所 1987 論文集 Vol.38 No.1
Adsorption equilibrium moisture content for short grain rough rice of Akihikari variety were determined at 20, 30, 40 and 50℃ and relative humidities ;ranging from 46.3 to 90.9 percent. A static method of equilibrium was used by suspending 16g of samples in jars with different saturated salt solutions. Triplicated samples were used for all trials. A new quadratic equation was proposed to correlate the EMC data and compared with Henderson, Chung-Pfost, and Day-Nelson equations. The goodness of fit of each equation was evaluated by determining the "Error Mean Square(EMS)". Quadratic equation gave the smallest EMS value followed by the Henderson equation.
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전동검,정완수 순천향대학교 기초과학연구소 1995 순천향자연과학연구 논문집 Vol.1 No.1
In this note we first recall the basic definition of non-degeneracy, next introduce the concepts and properties of non-degenerate critcal point an relation of structures on finite-dimensional manifold. In particular, we proved the following theorem that if M is a ι-dimensional manifold. critcal point ?? of f, index λ of mapping f : M→R, then tere exists imbedding : ??
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여성 연폭로 근로자들의 연폭로 지표와 자각증상에 관한 연구
이금원,임정규,안규동,이병국 순천향대학교 1994 논문집 Vol.17 No.2
The effect of lead on subjective symptoms of lead exposure was studied with 396 women lead workers in 6 storage battery factories as an exposed group to lead and 166 women workers in general manufacturing industries as a non-exposed group to lead. Zinc protoporphyrin in whole blood(ZPP) was selected as an indicator of lead exposure. SGOT and SGPT were also checked to observe the lead effect on liver function of lead workers. Questionnaires of 15 lead related symptoms were provided to all women workers and filled up by themselves and reconfirmed the symptoms answers by interviewing medical doctor. There was significant mean difference of blood ZPP between exposed group (90.0 ± 86.2 ug/dl) and non-exposed group (33.8 ± 29.9 ug/dl), but there was no differences of means of SGOT and SGPT between exposed and non-exposed group to lead. After age stratification, the symptom prevalences of exposed group were higher than non-exposed group in most cases. This trend was strong in the comparison of symptom prevalence of women worekrs whose ages were under 30 years. The symptom prevalence of women workers who worked in medium sized factories was higher than that of women workers working in small sized factories. While the symptom prevalence of all workers was not dose-dependent to ZPP increase in most symptoms category, there was weak trend of dose-respnse relationship of symptom prevalence with ZPP increase in women workers working in medium sized factories, but not statistically significant.
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새로운 연노출의 효과지표로서의 혈장 δ-aminolevulinic acid 측정의 유용성
이금원,황보영,김용배,리갑수,이성수,장봉기,함정오,안규동,이병국 순천향대학교 산업의학연구소 2001 순천향산업의학 Vol.7 No.1
To evaluate the usefulness of the measurement of plasma δ - aminolevulinic acid (ALAP) as a new effect indicator of lead exposure, the association of ALAP with blood lead, DMSA chelatable lead and bone lead with a special emphasis of genetic interaction of ALAD polymorphism was studied with 419 lead exposed workers and 85 non-lead exposed workers. Lead workers were recruited from storage battery industries, secondary smelting industries and other lead using industries and non-lead workers selected from electronic refrigerator manufacturing industry. Blood lead, DMSA chelatable lead and bone lead were chosen for parameters of lead exposure. Plasma and urinary ALA were selected for the effect parameter of lead intoxication. Information for age, smoking, drinking habit and body mass index were also obtained. Job duration for lead workers was also collected. The overall prevalence of the variant allele, ALAD type 1-2 or 2-2(ALAD2) in lead exposed workers was 10.0% (42 out of 419 lead workers) which was not differed from control workers (9.4% : 8 out of 85). The means blood lead and DMSA chelatable lead of lead workers with ALAD 1(ALAD type 1-1) were lower than those of lead workers with ALAD2, but the differences were not statistically significant. On the other hand, the mean of tibia lead of lead workers with ALADI was higher than that of lead workers with ALAD2, but the difference was not statistically significant. DMSA chelatable lead showed highest correlation with log transformed plasma ALA(LALAP)(r=0.682) and blood lead and tibia lead had r=0.650, r=0,402 correlation coefficient with LALAP respectively On the other hand. log transformed urinary ALA(LALAU) had lower correlation coefficient with all three parameters of lead exposure than LALAP. The equation of robustic simple linear regression of blood lead on LALAP was LALAP=2.0439+0.0165PbB in ALADI lead workers and LALAP=2.031+0.0121PbB in ALAD2 lead workers. ALAD genotype in the multiple regression analysis of blood lead with LALAP after adjusting for possible confounders(sex, ago, BMI, smoking and drinking status and job duration) showed significant main effect on LALAP resulting lower LALAP in ALAD2 lead workers than ALADI lead workers. On the other hand, effect modification of ALAD genotype was observed in the multiple regression analysis of tibia lead with LALAP after adjusting for possible confounders, but there was no significant effect of ALAD genotype in the multiple regression analysis of DMSA chelatable lead with LALAP after covariate adjustment. With above results, plasma ALA was found to be a useful effect parameter of lead exposure compared with urinary ALA. It was also observed that ALAD polymorphism made significant effect on the association of blood and tibia lead with ALAP. Thc lower plasma ALA in ALAD2 lead workers suggested supportive effect of ALAD2 in lead exposure.
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자궁경부 상피종양에서 human papillomavirus 감염과 survivin 발현
윤재호,정동준,이정은,박동명,배동한,선우재근,백무준,김창진 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.1
Human papillomavirus (HPV) has been considered a causative agent of uterine cervical carcinoma. HPV is a DNA oncogenic virus, which is well known as a causative virus in uterine cervical carcinoma. The virus is classified into two groups genotypically, low risk and high risk, according to the carcinogenic potentiality, and the determination of the viral genotype is important in clinical practice. Recently, numerous genotypes can be determined by high throughput method using DNA chip. Survivin is a recently characterized inhibitor of anti-apoptosis (IAP) protein, which is abundantly expressed in most solid and hematological malignancies, but undetectable in normal adult tissues. In this study, HPV genotypes are determined by DNA chip and the expression of survivin was examined by immunohistochemistry in 80 cases of uterine cervical intraepithelial neoplasia (CIN) and invasive carcinoma to see the roles of HPV and survivin in the carciogenesis of uterine cervical epithelial neoplasia. The results were as follows: 1. HPV positive rate was 72.5%, while negative rate was 27.5% in 80 cases of CIN and invasive carcinoma. The CIN and invasive carcinoma showed higher HPV positive rate (p <0.05). 2. HPV positive rate according to the histologic grade were 60%, 65%, 77% and 90% in CINI, CINII, CINII and invasive carcinoma, respectively. HPV positive rate showed increasing tendency according to the histologic grade, though there was no statistical significance. 3. The most frequent genotype was type 16 and the next were 58, 52, 18 and 33 in order of frequency. 4. Survivin was expressed in 96.3% of CIN and invasive carcinoma. The expression rate of survivin showed no significant difference between the histologic grade of CIN and invasive carcinoma, but showed tendency of increased expression rate in invasive carcinoma. 5. Survivin was expressed in HPV positive and in HPV negative each as in 95.5% and 96.6% respectively. There was no significant difference of survivin expression between HPV positive and negative cases. The above results suggest that HPV has no effect on the regulation of survivin expresson level in the uterine cervical intraepithelial neoplasia and invasive carcinomas.
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Jung, Keum-Dong,Lee, Cheon An,Park, Dong-Wook,Park, Byung-Gook,Shin, Hyungcheol,Lee, Jong Duk IEEE 2007 IEEE electron device letters Vol.28 No.3
<P>For the modeling of charge response behavior in the organic field-effect-transistor (OFET) channel, the admittance of the OFET channel is measured from the two-terminal MIS structures. The channel is considered as an R-C network, and both the capacitance and loss of the measured admittance show good agreement with the model. The effective delay of the R-C network depends on the sheet resistance of the channel, the insulator capacitance, and the channel length. The maximum operating frequency of an OFET can be limited by this delay, because the channel charges cannot be induced completely within the delay time</P>
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Modeling and Parameter Extraction for the Series Resistance in Thin-Film Transistors
Keum-Dong Jung,Yoo Chul Kim,Byung-Gook Park,Hyungcheol Shin,Jong Duk Lee IEEE 2009 IEEE transactions on electron devices Vol.56 No.3
<P>A new parameter extraction method is proposed for the series resistance of thin-film transistors (TFTs). By analyzing the gate-source overlap region of staggered structure TFTs, the model for the series resistance is derived and utilized for the parameter extraction. To verify the extraction method, the characteristics of amorphous silicon TFTs obtained from TCAD simulation are used. For the devices with different overlap lengths, the extracted parameters are identical to each other, although the series resistances are different due to the narrow overlap length. When the actual channel length is different from the mask-specified length, the offset length can be effectively corrected by the new method, so that accurate parameters can be obtained. Because the new method has several advantages such as the accuracy and generality over the conventional method, it can be used for further analysis of TFT characteristics.</P>
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