• Korean Journal of Health Education and Promotion
• /
• v.21 no.1
• /
• pp.217-242
• /
• 2004

This study was carried out to measure job satisfaction and quality of life and to clarify the factors in job satisfaction which influence on quality of life of dental technicians, using developed tools for job satisfaction and WHOQOL-BREF for quality of life. The subjects for this study were 238 people who worked the in the Daegu-Kyungbuk area. The results of this study were as follows； the general characteristics that influenced job satisfaction, were especially education, hobbies, salary level, job career and work hours. The factors that influenced the quality of life, were especially Married status, hobbies, job position, and office hours. All subfactors in job satisfaction were related to each other. Growth-development factor was intensely related with recognition factor. Also, all subfactors in quality of life were in positive relation to each other, especially psychological domain was highly related with social domain. Factors of safety, recognition and accomplishment in job satisfaction intensely affected quality of life. Therefore, It is suggested that social recognition for dental technician should be promoted and it might be needed to adjust office hours and support hobby life.

• Korean Journal of Materials Research
• /
• v.18 no.9
• /
• pp.486-491
• /
• 2008

The effect of annealing treatment conditions on the interfacial adhesion energy between electrolessplated Ni film and polyimide substrate was evaluated using a $180^{\circ}$ peel test. Measured peel strength values are $26.9{\pm}0.8,\;22.4{\pm}0.8,\;21.9{\pm}1.5,\;23.1{\pm}1.3,\;16.1{\pm}2.0\;and\;14.3{\pm}1.3g/mm$ for annealing treatment times during 0, 1, 3, 5, 10, and 20 hours, respectively, at $200^{\circ}C$ in ambient environment. XPS and AES analysis results on peeled surfaces clearly reveal that the peeling occurs cohesively inside polyimide. This implies a degradation of polyimide structure due to oxygen diffusion through interface between Ni and polyimide, which is also closely related to the decrease in the interfacial adhesion energy due to thermal treatment in ambient conditions.

• The Transactions of the Korean Institute of Power Electronics
• /
• v.2 no.2
• /
• pp.19-28
• /
• 1997

A simple AC complex circuit analysis for LCL type series resonant converter with phase shift control is proposed. Based on these analyses, a set of characteristic curves which allows a optimal design procedure for this converter is shown, without increasing the volt-ampere rating of tank circuit. Especially, inverter output peak current can be minimized in both full load and partial load conditions. The presented design considerations can make the load range wide from full loads to light loads achieving turn-on with zero voltage switching (ZVS) operation. The simulation and experimental results show the effectiveness of the proposed design algorithms.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.10 no.4
• /
• pp.717-721
• /
• 2009

This research knowledge and practice about a patient's oral health and oral hygiene related quality of life you want to measure the impact of oral health impact assessment, one of OHIP was evaluated by using the. The results are used daily in prevention knowledge and everyday knowledge, and how to use knowledge of dental supplies highly subjective feel the higher quality of lift. And with medical knowledge and experience, acquired knowledge OHIP higher the lower the quality of lift according to the subjective feel. Meanwhile, one of the whitening treatment aesthetic appreciation treatment higher subjective knowledge feel the higher quality of life. This means that knowledge of preventive oral health and aesthetic impart is expected to affect the index.

• Journal of Environmental Health Sciences
• /
• v.24 no.1
• /
• pp.24-31
• /
• 1998

This study was performed to investigate the difference in species of test fish on the determination of short-term bioconcentration factor in zebrafish(Brachydanio rerio), red sword tail(Xiphophorus hellieri) and goldfish(Carassius auratus). Experimental concentrations of carbamates were 0.05 and 0.10 ppm and chlorothalonil were 0.005 and 0.01 ppm for 3 and 5 days, respectively. This paper reports the measured BCF value on pesticides in various species of test fish, under steady state, and examined correlation between the BCF value and depuration rate constant or LC$_{50}$ or lipid content. Carbamates and chlorothalonil concentration in fish extract and BCF of carbamate and chlorothalonil were increased as incresing test concentration. Carbamates concentration in fish extract and BCF of carbamate were decreased as incresing test period, but chlorothalonil concentration in fish extract and BCF of chlorothalonil were increased as prolonging test period. Determined pesticide concentration in fish extract and BCF were highest in red sword tail, and followed by goldfish, and zebrafish. Determined depuration rate constant were highest in zebrafish, and followed by goldfish, and red sword tail. 96hr-LC$_{50}$ were highest in red sword tail, and followed by zebrafish, and goldfish. Lipid compositions were highest in red sword tail, and followed by goldfish, and zebrafish. Therefore, it is suggested that the difference of BCF between each pesticide due to those of lipid composition of fish and deputation rate constant, while LC$_{50}$ have no effect on BCF.

• Journal of Environmental Health Sciences
• /
• v.37 no.2
• /
• pp.133-140
• /
• 2011

Antimicrobial activity and bactericidal activity of Caesalpinia sappan L. extracts were investigated against five food-borne pathogens, E. coli, S. aureus, S. typhimurium, B. cereus and L. monocytogenes. Methanol extract of Caesalpinia sappan L. revealed antimicrobial activities against five pathogens. In particular, by paper disc diffusion the highest activity was shown against L. monocytogenes. Antimicrobial activities of methanol extracts showed the most potent activities, but hexane fraction had no activity. Fractions of ethyl acetate and butanol turned out to have higher antimicrobial activities against Gram(+) bacteria than Gram(-) bacteria. The minimum inhibitory concentration against five food-borne pathogens was 1.563 mg/ml on Gram(+) bacteria and 3.125 mg/ml on Gram(-) bacteria. The result of antimicrobial activity in a shaking flask method showed that bacterial growth rate fell by more than 99.999% at 3.125 mg/ml of methanol extract. The highest rate of viable reduction (99.998%) was shown at 0.781 mg/ml of methanol extract against L. monocytogenes. After five minutes of reaction between test strains and methanol extracts, the growth rates of five kinds of bacteria were reduced by more than 99.999% at a concentration of 100 mg/ml. Therefore, it is suggested that methanol extracts of Caesalpinia sappan L. can be developed as a natural sanitizer or disinfectant.

• Journal of Food Hygiene and Safety
• /
• v.19 no.2
• /
• pp.97-103
• /
• 2004

The present study was performed to investigate photodegradation rate constants and degradation products of piperophos by the USEPA method. The pesticide was very stable in 16 days exposure of sunlight from October 3 to 22, 2003 and humic acid had no sensitizing effect on the photolysis of each pesticide in sunlight. In the UV irradiation test, piperophos was rapidly degraded as increasing UV intensity. In case of UV irradiation with TiO$_2$ and with TiO$_2$ powder amount, degradation of piperophos was slower than UV irradiation. In order to identify photolysis product, the extracts of degradation product was analyzed by GC/MS. The mass spectrum of photolysis product of piperophos was at m/z 166. It was suggested that the photolysis products of piperophos was O, O-dipropyl phosphorodithioate.

• Journal of the Korean Society of Clothing and Textiles
• /
• v.29 no.6
• /
• pp.753-763
• /
• 2005

The purpose of this study was to determine effects of apparel product's brand personality, and brand equity on its brand extension. For the data collection, women in their 20s were surveyed, and a total of 576 questionnaire were finally used. Brand Reneevon and brand Enc were selected through a preliminary survey and then compared in terms of brand extension. Results of the study can be summarized as follows. 1 The brand personality of casual apparel for women consisted of low factors such as uniqueness, competence, fashionability and sincerity, while the brand equity of apparel included three factors brand loyalty, perceived quality and leadership, and brand association and awareness. 2. There was a significant positive correlation between brand personality and brand equity. 3. Brand Reneevon was found higher in brand equity than the brand Enc. 4. Brand extension was influenced by perceived quality and leadership. In case of the brand Enc, brand extension into fashion accessories was significantly affected by brand personality. 5. Brand Reneevon was found better than Brand Enc in brand extension, especially into fashion accessories.

• Journal of Food Hygiene and Safety
• /
• v.9 no.2
• /
• pp.57-66
• /
• 1994

The benefits of milk on the rats supplemented with cholesterol and vitamin D2 in diet was investigated. A total of 150 male rats of Sprague-Dawley strain, 5 weeks of age, were divided into 6 groups with the diet. Cholesterol control group was fed the diet containing 1.0% choleterol and 50,000 IU/100 g of vitamin D2 for 24 months, and M0.5, M1, M2 and M5 of milk groups were fed the diet containing cholesterol, vitamin D2 and 0.5, 1, 2 and 5 of reference daily intakes of whole milk, respectively. No remarkable differences of growth, diet intake, and food effciency ratio among groups were observed though rats in cholesterol control group showed abrupt decrease of diet intake and body weight showed slightly higher relative organ weights than did the rats in control group. The rats in cholesterol control group showed the highest serum total cholesterol level. The rats in milk groups showed lower total cholesterol level and higher high density lipoprotein (HDL)-cholesterol fraction than did the rats in cholesterol control group though no tendency was observed among milk groups. In milk groups, aorta, heart, kidney and liver of rats showed milder calcification and necrosis or fat degeneration compared with those in cholesterol control group. The above results suggest that whole milk could have beneficial effect on the cholesterol-and -vitamin D2-induced atherosclerosis in rats.

• Journal of the Korean Society of Food Culture
• /
• v.31 no.5
• /
• pp.442-456
• /
• 2016

The purpose of this study was to investigate eating habits and dormitory foodservices' satisfaction in university students using dormitory foodservice in the Jeollabuk-do Iksan area. Self-administered questionnaires were completed by 195 students (86 male, 109 female). Many students (58.5%) ate less than two meals per day and spent around 30 min eating meals. The results show that snack and midnight meals were the main reasons (37.9%) for unhealthy eating habits. Main source of nutritional knowledge and information were TV and the Internet (58.5%), followed by friends and people (25.1%), nutrition books (10.3%), elective courses (4.6%), and newspapers and magazines (1.5%). Men had significantly higher satisfaction scores for nutrition, taste, diversity of menu, as well as hygiene of dormitory food court compared to women (p<0.05). Salty taste was the most important factor in evaluation of taste satisfaction, whereas sour taste was opposite. The reason for taste dissatisfaction in the dormitory food court was not salty enough, and it may be related with their eating habits. The results show that students need education for adequate knowledge and information about the relationship between health and nutrition.