노인에서 정서 인식의 저하

이경욱,채정호,최인철,이해국,권용실,이정태 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.2

Objectives : The purpose of this study was to investigate whether elderly and young adults differ in their recognition of facial expressions of emotion. Methods : A total of 120 (elderly group 53, young group 67) subjects participated in this study. Korean facial expressions of emotion including happiness, sadness, fear, anger, disgust, surprise and neutral were used as stimuli for facial affect recognition test. Computerized facial affect recognition test that consists of facial affect discrimination test and facial affect intensity test was performed. Results : For facial affect discrimination test, there was a significant difference between two groups (F==3.986, P<.01) after controlling the effect of education. Elderly participants showed significantly less correct recognition rate with sadness, anger and disgust (p<.05). For facial affect intensity test, there was no significant difference between the groups in recognition of emotional intensity. Chi-square test or t-test was done according to the clinical variables. Multivariate analysis of covahance was done to test group differences of correct recognition rate and emotional intensity. Conclusion : This is the first report of differential decrease of facial affect recognition in elderly using Korean facial expressions. This study suggests that the decrement of facial affect recognition maye be a part of normal aging process.

α-Galactosidase 에 의한 Bifidobacteria 균수 측정에 관한 연구

강국희,이시경,백운화,민해기 成均館大學校 科學技術硏究所 1992 論文集 Vol.43 No.2

This method using the synthesis substrate of 5-bromo-4-chloro-3 indolyl-galactoside (X-a -Gal) was examined for the differential enumeration of Bifidobacteria and lactic acid producing bacteria. Bifidobacteria possess a high level of a-galactosidase activity. Bifidobacterium longum KCTC 3215 exhibited the highest a- galactosidase specific activity (8.57 units/mg protein). Determination of a -galactosidase activity using the PNPG procedure showed that Lactobacillus, Streptococcus, Pediococcus, and Leuconostoc strain had lower a-galactosidase activity as compared to Bifidobacteria. The X-a- Gal based medium is useful to identify Bifidobacteria among lactic acid producing bacteria since the enzyme action of a-galactosidase hydrolysis X-a-Gal substrate and releases indol which impacts a blue color to Bifidobacterial colonies on agar plates. All strains of Bifidobacteria appeared blue colonies on MRS agar medium supplemented with 100 uM X- a - Gal while colonies of other lactic acid producing bacteria appeared white or light blue.

비만세포주에서 Histamine 유리에 관한 연구

김형룡,국윤아,신민,이홍수,원진숙,김형민,이영미,정헌택,이혜숙,안녕형 원광대학교 생명공학연구소 1995 생명공학연구소보 Vol.3 No.1

유기용제 폭로 근로자의 자각증상에 관한 연구

엄영익,신혜련,우극현,안규동,이병국 순천향대학교 산업의학연구소 1997 순천향산업의학 Vol.3 No.1

To investigate the relationship of subjective symptoms of organic solvent exposed workers with their exposure level and urinary excretion of hippuric acid, 61 male workers who worked in 5 organic solvent using industries were studied. 89 workers were randomly selected from workers group for detailed health examination who visited hospital and had no exposure history to organic solvent as a control group. Personal air concentrations of organic solvent were checked for all organic solvent workers and urinary concentration of hippuric acid for both exposed and control group were also measured. Subjective symptom questionnaire of 31 organic solvent related item were provided to all workers and filled up by themselves and rechecked by medical doctor. The results obtained were as follows: 1. The overall prevalence rate of symptoms were significantly higher in exposed group than control group with statistical difference of 13 symptoms. 2. The overall prevalence rate of symptoms seemed to be increased by the exposure level of organic solvent. 3. The excretion of hippuric acid was more closely related to the level of toluene exposure than the level of mixed organic solvent exposure. 4. In the analysis of multiple stepwise regression using hippuric acid concentration as dependent variable and the concentration of each organic solvents as independent variables, only toluene had significant relationship with hippuric acid and none of other solvent did not affect on the concentration of hippuric acid. 5. In the analysis of multiple stepwise regression using symptom prevalence as dependent variable and the concentration of each organic solvents as independent variables, toluene had most significant effect to the symptom prevalence and the contribution of other solvents was minimal.

직업적인 납 노출이 없는 일부 중년 한국인의 골중납량 및 혈중납량

김남수,최성우,김진호,함정오,박해윤,안규동,이병국 大韓産業醫學會 2007 대한직업환경의학회지 Vol.19 No.4

목적: 우리나라에서 납에 직업적으로 노출되지 않은 일부 중년 성인들의 골중납량과 혈중납량의 수준과 상호관련성을 알아보기 위하여 40세 이상 남자 86명 여자 51명 총 137명을 대상으로 본 연구를 시도하였다. 방법: 연구변수로 골중납량인 경골납량,혈중납량을 택하였다. 경골납량은 K-shell XRF를 이용하여 각 대상 자들을 30분간 측정하였고,혈중납량은 원자흡광광도계법으로 분석하였다. 결과: 총대상자 137명의 경골납량의 평균±표준편차는 3.49±4.99 μg/g이었으며, 남자와 여자는 각각 3.90± 4.88 μg/g 및 2.80±5.14 μg/g이었으나 양군 평균의 통계적 차이는 없었다. 한편 총대상자 137명의 혈중납량의 평균±표준편차는 3.70±1.35 μg/dl이었으며,남자와 여자는 각각 3.93±1.25 μg/dl 및 3.30±1.42 μg/dl이었으나 양군 평균의 통계적 차이는 없었다. 음주,흡연 및 BMI를 통제한 후 혈중납량을 종속변수로 한 중 회귀분석에서 연령은 양의 영향을 주는 변수로 나타났다. 여자대상자만을 대상으로 한 중 회귀분석에서 교란변수를 통제한 후 연령은 경골납량에 경계수준의 양의영향을 나타내었다. 결론: 40세 이상의 우리나라 중년성인의 경골납량의 평균±표준편차는 3.49±4.99 μg/g이었으며,혈중납량의 평균±표준편차는 3.70±1.35 μg/dl이었다 혈중납량은 연령과 성과 유의한 양의 관련성이 있었으나,골중납량은 여자에서만 연령과 경계수준의 유의한 관련을 나타냈다. Objectives: In order to investigate the level and the association between bone lead and blood lead levels of non-occupationally, lead-exposed Koreans, the authors studied the lead biomarkers of 137 middle aged Koreans (86 males and 51 females) older than whose age were above 40 years. Methods: The tibia lead level was selected as the bone lead indicator of cortical bone, and the blood lead level was also measured. The tibia lead level was measured by K-shell XRF with 30-minute measurement of each subjects. The blood lead level was analyzed by AAS method. Results: The mean (SD) of the tibia lead level of the 137 study subjects was 3.49 (4.99) ,㎍/g, and tended to be higher. The mean (SD) of tibia lead level in male subjects (was 3.90 (4.88) ㎍/g) and larger than in that of female subjects (2.80 (5.14) ㎍/g), but without no statistical significance was observed. The mean (SD) of blood lead level of all total subjects was 3.70 (1.35) ,㎍/dl, and tended to be higher. The mean (SD) of blood lead level in male subjects (was 3.93 (1.25) ㎍/dl) and larger than in that of female subjects (3.30 (1.42) ㎍/dl), but without no statistical significance was observed. In multiple regression analysis of blood lead levels after adjusting for covariates, age was a significant independent variable. A weak association of age with tibia lead in female subjects was also observed in multiple regression analysis. Conclusion: The mean (SD) of tibia and blood lead levels of middle aged Koreans whose ages were over 40 years old were 3.49 (4.99) ㎍/g and 3.70 (1.35) ㎍/dl, respectively. Age and sex were positive predictors of blood lead level in multiple regression analysis after controlling for the covariates. However, in multiple regression analysis whereas age was weakly association with tibia lead level only in female subjects in multiple regression analysis.

Mast Cell Degranulation with Special Reference to the Effect of Lipid Administration upon the Mesenteric Mast Cell of Albino Rats

Lee, Kook,Lee, Yong Hae,Pak, Soo. Yun Yonsei University, College of Medicine 1968 Yonsei medical journal Vol.9 No.2

Fabrications of Poly(vinylidenefluoride-co-hexafluoropropylene) Nanofibers Containing Inorganic Filler by Electrospinning Technique and Its Application to Dye-Sensitized Solar Cells

Lee, Jin-Kook,Choi, Hyung-Ju,Park, Sung-Hae,Won, Doo-Hyun,Park, Hyun-Woo,Kim, Jung-Hyon,Lee, Chan-Jong,Jeong, Seong-Hoon,Kim, Mi-Ra Informa UK (TaylorFrancis) 2010 Molecular Crystals and Liquid Crystals Vol.519 No.1

Highly Dense Mn-Co Spinel Coating for Protection of Metallic Interconnect of Solid Oxide Fuel Cells

Lee, Sung-Il,Hong, Jongsup,Kim, Hyoungchul,Son, Ji-Won,Lee, Jong-Ho,Kim, Byung-Kook,Lee, Hae-Weon,Yoon, Kyung Joong The Electrochemical Society 2014 Journal of the Electrochemical Society Vol.161 No.14

<P>The major degradation issues of solid oxide fuel cells (SOFC) are associated with the oxide scale growth and Cr evaporation of the metallic interconnect. To address these challenges, a highly dense spinel oxide coating was fabricated on a ferritic stainless steel interconnect using a cost-competitive ceramic processing route. The nano-scale Mn<SUB>1.5</SUB>Co<SUB>1.5</SUB>O<SUB>4</SUB> spinel powder was synthesized using a glycine-nitrate method, and the particle agglomerates were effectively disintegrated by a high-energy attrition milling process. The spinel protective coating, which was applied by screen printing, was sintered to a nearly full density, without causing damage to the metallic substrate, by a high-temperature annealing process in a reducing environment, followed by re-oxidation at a moderate temperature. The dense spinel coating remarkably reduced the growth rate of chromia scale and restrained the evaporation of chromium species, as verified by area specific resistance (ASR) measurements and analysis on chromium distribution over the cross-section. Strong adhesion between the coating and substrate was confirmed after 500-hour operation. The sintering mechanism involved in reduction-oxidation heat-treatment was studied based on dilatometry measurements and microstructural features. The implication of the ASR change and the chromium migration for stability of practical SOFC stacks was discussed in detail.</P>

Powder Packing Behavior and Constrained Sintering in Powder Processing of Solid Oxide Fuel Cells (SOFCs)

Lee, Hae-Weon,Ji, Ho-Il,Lee, Jong-Ho,Kim, Byung-Kook,Yoon, Kyung Joong,Son, Ji-Won The Korean Ceramic Society 2019 한국세라믹학회지 Vol.56 No.2

Widespread commercialization of solid oxide fuel cells (SOFCs) is expected to be realized in various application fields with the advent of cost-effective fabrication of cells and stacks in high volumes. Cost-reduction efforts have focused on production yield, power density, operation temperature, and continuous manufacturing. In this article, we examine several issues associated with processing for SOFCs from the standpoint of the bimodal packing model, considering the external constraints imposed by rigid substrates. Optimum compositions of composite cathode materials with high volume fractions of the second phase (particles dispersed in matrix) have been analyzed using the bimodal packing model. Constrained sintering of thin electrolyte layers is also discussed in terms of bimodal packing, with emphasis on the clustering of dispersed particles during anisotropic shrinkage. Finally, the structural transition of dispersed particle clusters during constrained sintering has been correlated with the structural stability of thin-film electrolyte layers deposited on porous solid substrates.

Novel Strategies to Fabricate an Anode Supported-Type Protonic Ceramic Fuel Cells (PCFCs)

Lee, Jong-Ho,Choi, Sung-Min,Park, Su-Byung,Yoon, Kyung Joong,Son, Ji-Won,Je, Hae-June,Kim, Byung-Kook,Lee, Hae-Weon The Electrochemical Society 2013 ECS transactions Vol.57 No.1

<P>Protonic ceramic fuel cells (PCFCs) based on BaZr<SUB>1-x</SUB>Y<SUB>x</SUB>O<SUB>3-δ </SUB>(BZY) have attracted great attention as an alternative for the conventional high temperature fuel cells based on oxygen conducting electrolyte. However, this BZY-based PCFC technology still has many technical problems, especially related with the poor sinterability of BZY electrolytes. In order to overcome this poor sinterability which is a critical limitation in making a thin and dense electrolyte layer for anode-supported PCFCs, we employe the sintering aid-assisted enhanced sintering of BaZr<SUB>0.85</SUB>Y<SUB>0.15</SUB>O<SUB>3-δ </SUB>(BZY). We also promote the densification of BZY layer by utilizing the higher sinterability of BaCe<SUB>0.9</SUB>Y<SUB>0.1</SUB>O<SUB>3-δ </SUB>(BCY) that is attached to the top of BZY layer. From proper adjusting of the shrinkage behaviors of both anode substrate and dual electrolyte layer, we could fabricate fairly dense BZY/BCY electrolyte layer with less than 10 micro-meter thickness.</P>