• Proceedings of the Korea Concrete Institute Conference
• /
• 2003.05a
• /
• pp.41-46
• /
• 2003

Until now, the quantity to recycle wasted concrete as the great supplementary value was very little. But considering a insufficiency of the present state of aggregates, the recycling of wasted aggregates is indispensable. This study will offer the basic application data of the recycled aggregates to make by the new attempt and offer the basic data of the great supplementary value of recycled aggregate to make good use of precast process. The result of compressive strength, tensile strength, flexural strength and drying shrinkage test of concrete by recycled aggregates were similar to the property of normal aggregate concrete, and the contrary effect of recycled aggregate by high temperature steam curing do not have been found out. Therefore the great supplementary value of recycled aggregate to make good use of precast process is possible way to be helpful to a insufficiency of the present state of aggregates.

• Korean Journal of Veterinary Research
• /
• v.24 no.1
• /
• pp.24-30
• /
• 1984

The protective effects of high levels of dietary iron, copper, zinc or protein on lead toxicity were studied In chicks. Growth retardation, reduction of feed intake, anemia and accumulation of lead in the bone and kidney were observed in chicks fed a diet containing 500mg lead as chloride per kg of feed for 42 days. Early changes due to ingested lead were inhibition of red blood cell ${\delta}$-aminolevulinic acid dehydrase at all doses and no effect of iron, copper, zinc or protein addition were observed. Tibia lead accumulation was reduced in chicks receiving additional dietary iron or zinc compared to the lead only group but increased in chicks given supplementary protein. Decreased body weight gain was overcome by supplementary zinc or protein in chicks fed lead but not by supplementary iron. Overall the results of this study show that lead poisoning can be partly reduced by providing supplementary iron, zinc or protein, but the interaction of these element remained to be elucidated.

• Korean journal of food and cookery science
• /
• v.9 no.2
• /
• pp.105-108
• /
• 1993

This study was carried out in order to investigate the condition of storage and to evaluate preference of supplementary foods for infants using Korean foods. Thirty-four different kinds of supplementary foods were developed and fourteen representative ones were selected to be analyzed. A safety storage assay and sensory evaluation were conducted. The results are as follows: 1. In the safety storage assay, the microbiological quality of the products was good during the 13 day-storage in refrigerator. After 14 days, the total plate counts in the products were low and were determined safe. During the 17 day-storage in refrigerator, coliform was not found. 2. In the sensory evaluation, fruit products scored high in acceptability and cow liver products scored low.

• Communications of Mathematical Education
• /
• v.20 no.3 s.27
• /
• pp.483-502
• /
• 2006

In this research, we try to accomplish the main purpose of managing the special supplementary curriculum and set a model for its organization and management to the other schools by analyzing the result from the management of the special supplementary curriculum through mentoring lessons that are proposed in the 7th curriculum to provide the underachieved students with opportunities to study the subjects they couldn't understand during the regular curriculum.

• Journal of Family Resource Management and Policy Review
• /
• v.4 no.1
• /
• pp.1-13
• /
• 2000

This study examined patterns and determinants of families’supplementary educational investment on children. By supplementary educational investment, it meant the amounts of money spent on children’s education other than regular formal schooling expenses. The data used were from the 「1996 Household Expenditure Survey」conducted by the National Statistical Office. The statistical methods employed were descriptive statistics, cluster analysis and logistic multiple regression analysis. Results of cluster analysis revealed five different patterns of family supplementary education expense with relatively even proportion of families allocated to each pattern. The five education expenditure patterns were arts education dominant; other education dominant; gymnastics·clerical·computer education dominant; college entrance exam preparation dominant; and private tutoring dominant. Results of logistic regression analysis showed that the possibility of being in a pattern affected by various family socioeconomic variables. Important factors affecting there patterns were children’s schooling stage, residence, and mother’s education.

• Journal of Korean Society of Industrial and Systems Engineering
• /
• v.34 no.2
• /
• pp.103-111
• /
• 2011

The reduction of setup time is very important in a lot production system. A punch press is a typical system of lot production. This paper describes a case study to reduce setup time of a punch press manufacturing system. Especially, this case study reduced the time of die exchange in the case that the standardization of die height is impossible realistically because of diversity on die height and heavy expenses. This study adopts a supplementary die and supplementary blocks to make the use of auto-clamping device possible. The paper also gives a sequencing algorithm to reduce the number of exchange of the supplementary die.

• Journal of Korean society of Dental Hygiene
• /
• v.11 no.2
• /
• pp.159-167
• /
• 2011

Objectives : The purpose of this study was to examine the satisfaction level of dental hygienists with supplementary education. The subjects in this study were 305 dental hygienists, on whom a survey was conducted from September 26 to December 10, 2009. Methods : The instrument used in this study was questionnaires that consisted of three sections: educational environments, the content and method of education, and educational administration. Results : The findings of the study were as follows: 1. In terms of satisfaction level with supplementary education, they gave a mean of 3.13, which was on the average. The dental hygienists who worked in public dental clinics, who had a 10 years or more of career and who worked in the provinces expressed more satisfaction. 2. In terms of satisfaction level with educational environments, they gave a mean of 3.22. They were most gratified with lecturers(3.34), and they expressed the least satisfaction with educational opportunities(3.14). 3. In terms of satisfaction level with the content and method of education, they gave a mean of 3.15. They were most contented with the professionalism of education, and they expressed the least satisfaction with the ratio of theory and practice(2.92). 4. In terms of satisfaction level with educational administration, they gave a mean of 3.02. They were most satisfied with the application procedure(3.22), and they expressed the least satisfaction with educational cost and publicity(2.91). Conclusions : Educational institutions that provide supplementary education should reinforce small-group supplementary education for each district, provide systematic practice-centered educational programs and offer streamlined administration service to boost the satisfaction level of dental hygienists.

• Journal of Nutrition and Health
• /
• v.12 no.1
• /
• pp.23-30
• /
• 1979

For the purpose of investigating the weaning practice for infants, this study of 251 infants aged from 3 months to 2 years old was conducted in Daejeon City during the the period of August 9 through 23, 1978. The results obtained were as follows: About 60% of the infants were breast-fed, 27.6%, mixed-fed, and 12.0%, bottled-fed. The reason for bottle-feeding was either the lack of breast-milk secretion or ill-health of mothers. There was no significant difference in the feeding methods according to a level of mother's education. Sixty precent of the infants began to be weaned 6. months. The most of the infants were completely weaned within 18 months. The knowledge on weaning was mainly obtained from the publications, such as newspapers, journals for women, child care booklets, etc. The difficulties in the weaning practice were the shortage of knowledge on weaning and the unacceptability by the infants. Liquid or semi-liquid foods were firstly given to the more than 60% of the infants as introducing weaning foods, while 23.3% of the babies were given solid foods. Interestingly, the earlier the birth order was, the more babies were given liquid or semi-liquid foods, The motives for weaning was either the boby's demand for other foods than milk(41.3%) or the lack of breast-milk secretion (31.3%). In the selection of supplementary foods, the nutritional value was given the highest consideration) (54.9%). many mothers (64.2%) prepared supplementary foods for infants at home, while 23.1% used commercial body foods and 12.7% gave infants adult's meals as supplementary foods. The major materials for home-made supplementary foods were fruits and vegetables (41.5%) and cereals (37.5%). The commercial supplementary foods (mainly powdered from) were not used much (never used; 53.6%) and even in the babies, who had consumed them once, nearly half of the babies (42.9) did not eat well. Accordingly, the many mothers (68.8%) welcomed the development of the domestic supplementary foods in good quality and one-third (31.2%) responded that they would consume them regardless of the price.

• Restorative Dentistry and Endodontics
• /
• v.48 no.4
• /
• pp.36.1-36.15
• /
• 2023

Objectives: This study aimed to compare the effectiveness of a single-file reciprocating system (WaveOne Gold, WOG) and a multi-file rotary system (ProTaper Universal Retreatment, PTUR) in removing canal filling from severely curved canals and to evaluate the possible adjunctive effects of XP-Endo Finisher (XPF), the Self-Adjusting File (SAF), and an erbium, chromium: yttrium, scandium, gallium garnet (Er,Cr:YSGG) laser using microcomputed tomography (µCT). Materials and Methods: Sixty-six curved mandibular molars were divided into 2 groups based on the retreatment technique and then into 3 based on the supplementary method. The residual filling volumes and root canals were evaluated with µCT before and after retreatment, and after the supplementary steps. The data were statistically analyzed with the t-test, Mann-Whitney U test, analysis of covariance, and factorial analysis of variance (p < 0.05). Results: PTUR and WOG showed no significant difference in removing filling materials (p > 0.05). The supplementary techniques were significantly more effective than reciprocating or rotary systems only (p < 0.01). The supplementary steps showed no significant differences in canal filling removal effectiveness (p > 0.05), but XPF showed less dentin reduction than the SAF and Er,Cr:YSGG laser (p < 0.01). Conclusions: The supplementary methods significantly decreased the volume of residual filling materials. XPF caused minimal changes in root canal volume and might be preferred for retreatment in curved root canals. Supplementary approaches after retreatment procedures may improve root canal cleanliness.

• Applied Biological Chemistry
• /
• v.51 no.4
• /
• pp.281-287
• /
• 2008

Effect of combined use of anti-microbial materials, such as alcohol, mustard and chitosan, or pasteurization on the quality of low salted kochujang was investigated during storage at $30^{\circ}C$ for 12 weeks. Activity of amylase decreased during storage, with lower activity in pasteurized kochujang than the other groups. Acidic protease activity increased during storage, but neutral protease activity decreased after 4 weeks. Viable cells of yeast increased during storage, but bacterial counts decreased gradually and did not show any remarkable difference among the test groups. Hunter a-values decreased as storage time increased, whereas L- and b-values decreased after 4 weeks and the degree of increase in total color difference (${\Delta}E$) was low in the supplementary ingredients added kochujang. The moisture contents and water activities decreased during storage with being lower in supplementary ingredients added groups. Titratable acidity of kochujang was decreased after 4 weeks of storage with the highest in combination of the supplementary ingredients added group. Oxidation-reduction potential was low in the supplementary ingredients added kochujang. Total sugar and reducing sugar contents of kochujang decreased during storage, with the highest contents in the supplementary ingredients added group. Ethanol content of kochujang increased during storage, whereas ethanol production was reduced in ethanol added one. Amino-nitrogen and ammonia-nitrogen contents decreased during storage with being lower in kochujang prepared with supplementary ingredients. Therefore, supplementary ingredients added kochujang would be effective for extending shelf-life of kochujang.