• Proceedings of the Korean Nuclear Society Conference
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• 1996.11b
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• pp.521-526
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• 1996

원자력 발전소 내의 1차계통수에 존재하는 부식생성물과 노심에서 방사화된 여러 핵종들의 종류와 그 양에 대해서 CRUDSIM/MIT모형을 이용해서 분석하였다. 고리 4호기의 차계통수내의 수화학 조건을 이용하여 CRUDSIM/MIT모형에 적용하고 그 결과를 냉각수의 Activity자료와 증기 발생기의 Activity자료와 서로 비교 분석하였고, 노심과 증기발생기의 Crud양과 Activity를 예상하였다. 이 모형의 주요 인자인 $\beta$$_{c}$와 $\beta$$_{a}$ 값을 증기발생기의 Activity측정자료에 의해서 구하였다. 그리고 발전소 운전 중에 증기 발생기와 냉각수의 Activity각 최소화 할 수 있는 최적 조건 범위도 냉각수의 온도, pH, 수소농도등을 변화시켜서 구하였다. 고리4호기에 이 모형을 적용할 때 입력 자료에서, Activation Factor와 Recoil Release 등의 인자와 증기 발생기의 방사선양과 핵연료 표면의 Crud양을 구할 수 있으면 더욱 정확한 결과 값들을 얻을 수 있다.

• Korean Journal of Mathematics
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• v.29 no.3
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• pp.519-526
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• 2021

In a very recent paper, Yousef et al. [Anal. Math. Phys. 11: 58 (2021)] introduced two new subclasses of analytic and bi-univalent functions and obtained the estimates on the first two Taylor-Maclaurin coefficients |a₂| and |a₃| for functions belonging to these classes. In this study, we introduce a general subclass 𝔅^h,p_Σ(λ, μ, 𝛿) of analytic and bi-univalent functions in the unit disk 𝕌, and investigate the coefficient bounds for functions belonging to this general function class. Our results improve the results of the above mentioned paper of Yousef et al.

• Journal of The Korean Society of Grassland and Forage Science
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• v.22 no.2
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• pp.131-136
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• 2002

A field experiment was carried out to compare the nitrate nitrogen concentration, sugar content and animal intake of low $sorghum{\times}sudangrass$ hybrids (Sorghum bicolor (L.) Moench) grown under application of animal manure in 1995. The application amount of animal manure were 40MT in cattle manure, and 30MT/ha in swine and poultry manure. The four NLCF's recommended hybrids used in this study were Pioneer 988, TE-Haygrazer and NC+ 855 (heading type), and Jumbo(headless type). The nitrate nitrogen concentration of forage was 365mg/kg at 50~60cm of plant height, 501mg at 100~120cm, and 502mg at 200~220cm, regardless of animal manure type and cultivar. The nitrate nitrogen concentration of NC+ 855 and P 988 was 519 and 526mg, respectively, and were higher than that(317mg) of Jumbo(P<0.05). The nitrate nioogen concentration of stems was 376mg, and significantly higher than that(135mg) of leaves(P<0.05) regardless of cultivar, and lower parts of stems and leaves were higher than those of upper parts of plants. The sugar contents of four $sorghum{\times}sudangrass$ hybrids were ranged between 3.1 and $3.7^{\circ}$ in cattle manure, 2.9 and $3.3^{\circ}$ in swine manure, and 2.8 and $4.9^{\circ}$ in poultry manure. The sugar content of NC+ 855 was the highest as $3.9^{\circ}$, p 988 was second as $3.4^{\circ}$, and then TE-Haygrazer and Jumbo were lower as $3.2^{\circ}$ and $2.9^{\circ}$, respectively. Animal intake of sorghum ${\times}$ sudangrass hybrids P 988 and NC+ 855 were slightly higher than those of Jumbo and TE-Haygrazer grown under application of cattle manure. Also the average intake of P 988 was a little higher than that of Jumbo. However, there were no significant differences of forage intake among few recommended $sorghum{\times}sudangrass$ hybrids.

• Journal of Korean society of Dental Hygiene
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• v.20 no.1
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• pp.41-51
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• 2020

Objectives: The purpose of this study was to investigate the effects of oral health behaviors of patients with hypertension and diabetic patients on the number of remaining teeth in Korean adults over 45 years of age, furthermore, we also aimed to develop oral health care programs and health promotion for patients with hypertension and diabetes. Methods: Altogether, 1,526 subjects with hypertension and diabetes from the 6th Korean National Health and Nutrition Survey (2013-2015) were analyzed. Results: A multiple logistic regression analysis was performed to determine the effects of oral health behavior and periodontal disease on residual teeth in patients with hypertension and diabetes after adjusting for age. We found 1.53 times the risk of having less than 20 remaining teeth in the group of brushing more than 3 times a day (95% CI: 1.00,2.35, p<0.001), 2.27 times (95% CI: 1.23-4.17, p<0.05) in the group not using the dental floss group 0.05), compared to the group undergoing regular dental check-up (95% CI: 0.93-1.85, p>0.05), compared to the non-smoking group 0.77 times (95% CI: 0.51-1.14, p>0.05), 1.33 times (95% CI: 0.98-1.80, p>0.05) in the drinking group compared to the non-drinking group, in the periodontal disease group, the risk of having less than 20 remaining teeth was 2.19 times higher (95% CI: 1.48-3.24, p>0.001) than in the normal group. Conclusions: As a super-aging society, develops in Korea, the prevalence of hypertension and diabetes will increase gradually. Therefore, an oral health policy should be implemented at the national level for the prevention and treatment of periodontal disease as well as the management of oral health the elderly.

• Journal of Microbiology
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• v.44 no.1
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• pp.35-41
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• 2006

The unique gene encoding thioredoxin reductase (TrxR) was previously cloned and characterized from the fission yeast Schizosaccharomyces pombe, and its expression was induced by oxidative stress. To elucidate tbe regulatory mechanism of the S. pombe TrxR gene, three fusion plasmids were generated using polymerase chain reaction: pYUTR20, pYUTR30, and pYUTR40. Plasmid pYUTR20 has an upstream region of 891 base pairs, pYUTR30 has 499 in this region, and pYUTR40 has an 186 bp upstream region. Negatively acting sequence is located between $-1,526\;\~\;-891bp$ upstream of the gene. The upstream sequence, responsible for the induction of TrxR by menadione (MD), is situated on the $-499\;\~\;-186bp$ region, which is also required for TrxR induction by mercuric chloride. The same region also appeared to be required for Pap1-mediated transcriptional regulation of the TrxR gene, which contains the two plausible Papl binding sites, TTACGAAT and TTACGCGA. Consistently, basal and inducible expression of the TrxR gene was markedly lower in the Pap1-negative TP108-3C cells than in wild-type yeast cells. In summary, up-regulation of the S. pombe TrxR gene is mediated by Pap1 via the transcriptional motif(s) located on the $-499\;\~\;-186bp$ region.

• Nutrition Research and Practice
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• v.5 no.6
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• pp.520-526
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• 2011

Folate deficiency and hyperhomocysteinemia are found in most patients with alcoholic liver disease. Oxidative stress is one of the most important mechanisms contributing to homocysteine (Hcy)-induced tissue injury. However it has not been examined whether exogenous administration of folic acid attenuates oxidative stress and hepatic toxicity. The aim of this study was to investigate the in vivo effect of folic acid supplementation on oxidative stress and hepatic toxicity induced by chronic ethanol consumption. Wistar rats (n = 32) were divided into four groups and fed 0%, 12%, 36% ethanol, or 36% ethanol plus folic acid (10 mg folic acid/L) diets. After 5 weeks, chronic consumption of the 36% ethanol diet significantly increased plasma alanine transaminase (ALT) (P < 0.05) and aspartate transaminase (AST) (P < 0.05), triglycerides (TG) (P < 0.05), Hcy (P < 0.001), and low density lipoprotein conjugated dienes (CD) (P < 0.05) but decreased total radical-trapping antioxidant potential (TRAP) (P < 0.001). These changes were prevented partially by folic acid supplementation. The 12% ethanol diet had no apparent effect on most parameters. Plasma Hcy concentration was well correlated with plasma ALT (r = $0.612^{**}$), AST (r = $0.652^*$), CD (r = $0.495^*$), and TRAP (r = $-0.486^*$). The results indicate that moderately elevated Hcy is associated with increased oxidative stress and liver injury in alcohol-fed rats, and suggests that folic acid supplementation appears to attenuate hepatic toxicity induced by chronic ethanol consumption possibly by decreasing oxidative stress.

• Journal of Chest Surgery
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• v.33 no.6
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• pp.507-511
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• 2000

Background: The prognosis for young patients generally considered to be poor. The purpose of this study was to determined whether the clinical characteristics and the survival rate in young lung cancer patients after surgical treatment differs from that in older patients. Material and Method: Of 526 patients, 28(5.3%) were 30 to 40 years old. We studied the clinical characteristics and prognosis of 28 patients aged 40 years or less(Group 1), in whom primary lung cancer was diagnosed and operated between 1990 and 1997, and compared them with those 498 patients aged more than 40 years(Group 2). Result: The differences in sex ratio that were higher for women in Group 1, but there was no significant difference (p=0.297). The percentages for smokers and symptoms in Group 1 were significantly less than in Group 2.(p=0.049, p=0.008). Adenocarcinoma was significantly more common (p=0.018) and squamous cell diagnosed was diagnosed as stage IIIb or stage IV in 9 patients(32.1%), while 12.0% of the patients older than 40 years of age had either stage IIIb or stage IV(p=0.002). The 5-year survival rate was 41.3% in Group 1 ; 37.7% in Group 2, and the median survival time was 24.3 months in Group 1 ; 27.0 months is Group 2. There were no significant difference in survival between two age groups(p=0.808). Conclusion: Younger patients have more adenocarcinoma, however have less squamous cell carcinoma, less symptoms and less smoking history. Although younger patients tended to have more advanced disease and less complete resection rate, the recurrence and the long term survival in these patients did not differ that of older patients.

• Microbiology and Biotechnology Letters
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• v.16 no.6
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• pp.526-531
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• 1988

Procedure for the purification of pretense from culture broth of Streptomyces sp. SMF301 was developed. It was evident that the strain produced two different proteases of which molecular weights were estimated to be 23, 500 and 38, 900 dalton. It was found that the optimum pH of the smaller was 9.0 and that of the larger was 1.0. The optimal temperature of the alkaline pretense was 5$0^{\circ}C$ and that of the neutral pretense was much more stable than neutral protease at extreme condition viz. high temperature, and pH.

• Journal of the East Asian Society of Dietary Life
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• v.7 no.4
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• pp.519-526
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• 1997

Physicochemical properties of potato starches with degree of substitution of 0-0.2645 hydroxypropylated with propylene oxide were examined. Hydorxypropyl group content of the starch was proportional to propylene oxide concentration. Water binding capacity increased but pH decreased with the increase of degree of substitution. Blue value and iodine absorption property decreased with the increase of hydroxypropylation. Differential scanning calorimeter showed that hydroxypropylation lowered the gelatinization temperature of the starch. Relative crystallinity in X-ray diffraction patterns decreased and starch granule observed by scanning electron microscopy was destroyed by hydroxypropylation. This result implied that high level hydroxypropylation affected the crystal region as well as amorphous region of starch.

• Journal of Microbiology and Biotechnology
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• v.14 no.5
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• pp.1093-1098
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• 2004

An open reading frame encoding CadC, consisting of 526 amino acids, was identified from the upstream region of the Vibrio vulnificus cadBA operon. The deduced amino acid sequences of the cadC were 22 to 78% similar to those reported from other Enterobacteriaceae. Functions of cadC gene on acid tolerance were assessed by comparing acid tolerances of V. vulnificus and its isogenic mutant, whose cadC gene was inactivated by allelic exchanges. The results demonstrated that the gene product of cadC contributes to acid tolerance of V. vulnificus, and that its contribution is dependent on prior exposure of cells to moderately acidic pH. The cellular level of cadB and cadA transcripts decreased in the cadC mutant, indicating that CadC exerts its effect on acid tolerance of V. vulnificus by enhancing the expression of cadBA in a pH-dependent manner.