• Advances in concrete construction
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• v.11 no.4
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• pp.335-345
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• 2021

It is known from the literature that there are relatively few studies on the engineering properties of ultra-high performance concrete (UHPC) in early age. In fact, in order to ensure the safety of UHPC during construction and sufficient durability and long-term performance, it is necessary to explore the early behavior of UHPC. The test parameters (test control factors) investigated included the percentage of cement replaced by silica fume (SF), the percentage of cement replaced by ultra-fine silica powder (SFP), the amount of steel fiber (volume percent), and the amount of polypropylene fiber (volume percentage). The engineering properties of UHPC in the fresh mixing stage and at the age of 7 days were investigated. These properties include freshly mixed properties (slump, slump flow, and unit weight) and hardened mechanical properties (compressive strength, elastic modulus, flexural strength, and splitting tensile strength). Moreover, the effects of the experimental factors on the performance of the tested UHPC were evaluated by range analysis and variance analysis. The experiment results showed that the compressive strength of the C8 mix at the age of 7 days was highest of 111.5 MPa, and the compressive strength of the C1 mix at the age of 28 days was the highest of 128.1 MPa. In addition, the 28-day compressive strength in each experimental group increased by 13%-34% compared to the 7-day compressive strength. In terms of hardened mechanical properties, the performance of each experimental group was superior to that of the control group (without fiber and without additional binder materials), with considerable improvement, and the experimental group did not produce explosive or brittle damage after the test. Further, the flexural test process found that all test specimens exhibited deflection-hardening behavior, resulting in continued to increase carrying capacity after the first crack.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• v.24 no.3
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• pp.316-324
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• 2021

Purpose: The use of soy-based infant formula has increased widely in infants with cow's milk allergy (CMA). This study aimed to provide evidence on the growth pattern of CMA infants fed with soy-based infant formula in an Indonesian setting. Methods: A multi-site, intervention study was conducted among full-term and normal birth weight CMA infants. Within six months, the subjects were provided with a soy-based infant formula. Weight, height, and head circumference were measured at baseline, weeks 4, 8, 12, 16, 20, and 24. Adverse events were recorded by scoring atopic dermatitis and symptom-based clinical scores. Results: Based on the World Health Organization growth chart, we found that most of subjects had normal nutritional status for weight-for-age, length-for-age, weight-for-length, and head-circumference-for-age. There were statistically significant differences between baseline and end-line for weight-for-age, length-for-age, weight-for-length, and head circumference-for-age nutritional status. No allergic symptoms or intolerance toward soy formula were observed at the end of the intervention period. Conclusion: These results show that infants fed with soy-based infant formula have a normal pattern of growth.

• Journal of the Korea Society of Computer and Information
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• v.27 no.6
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• pp.109-116
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• 2022

Before examining stress and physiological variables (immunity, inflammation), this study conducted a pilot test to provide basic data by analyzing depression and anxiety symptoms by age group for stress coping and coping methods. As a non-face-to-face method, BDI and STAI by age group (20s to 70s) and face-to-face survey were conducted concurrently and as follow-up surveys. In 20s to 60s, according to the coping method, there was a significant decrease after stress relief, and in all age groups, anxiety decreased significantly after stress relief, and in the 50s, stress coping with exercise was the lowest after stress relief. Based on the results of this study, through basic research according to psychological variables, physiological variables according to actual stress coping methods were further verified, and subjects with high stress levels were treated with long-term exercise therapy for depression and anxiety symptoms by exercise therapy. It will be necessary to additionally verify the appropriate stress coping method for each age group and subject, such as the correlation between improvement and immunity and inflammatory response.

• The Journal of Korean Obstetrics and Gynecology
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• v.29 no.3
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• pp.78-90
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• 2016

Objectives: The purpose of these cases is to report the effects of Korean medicine on two women with recurrent miscarriage.Methods: One women who had recurrent miscarriage with myoma uteri was 39 years old. She was treated with herbal medicine and acupuncture until intrauterine pregnancy (IUP) 14 wks. the other who had recurrent miscarriage with adenomyosis was 40 years old. she was also treated with these until IUP 11 wks.Results: After treatment, one women delivered successfully by normal full term spontaneous delivery. The other succeeded in normal pregnancy and she is 15 weeks pregnant.Conclusions: Two cases show that Korean Medicine has effects on recurrent miscarriage with old age and underlying diseases.

• Journal of Engineering Education Research
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• v.18 no.2
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• pp.14-26
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• 2015

The purpose of this study was to analyze the number of university entrants influenced by the population decline of school age, to discuss the major issues of university restructuring policy initiated by government, and to suggest the mid- to long-term policy agenda on university restructuring. According to the analysis of university enrollment changes, university enrollment quota will decrease to 29% of year 2013. And the ratio of private university enrollment and the entrants of universities in the metropolitan areas will increase. Under these circumstances, it is highly concerned that high school graduates will be more concentrated to private universities located in the metropolitan areas. The government policy on university restructuring have several problems on the direction, the pursuing strategies, and the negative impacts of it. This study suggested the new paradigm for the university development and also the alternative strategies such as the balanced development in universities, financial support system, school-to-work policy, university collaboration system, and an enactment of university development.

• Journal of the Korea Concrete Institute
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• v.16 no.3 s.81
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• pp.425-431
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• 2004

This paper describes an experimental investigation of how time-dependent deformations of high strength concretes are affected by maximum size of coarse aggregate, curing time, and relatively low sustained stress level. A set of high strength concrete mixes, mainly containing two different maximum sizes of coarse aggregate, have been used to investigate drying shrinkage and creep strain of high strength concrete for 7 and 28-day moist cured cylinder specimens. Based upon one-year experimental results, drying shrinkage of high strength concrete was significantly affected by the maximum size of coarse aggregate at early age, and become gradually decreased at late age. The larger the maximum size of coarse aggregate in high strength concrete shows the lower the creep strain. The prediction equations for drying shrinkage and creep coefficient were developed on the basis of the experimental results, and compared with existing prediction models.

• The Journal of the Korean dental association
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• v.12 no.2
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• pp.93-97
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• 1974

The author have analysed the patients of Dept. of prosthodontics in the Infirmary, College of Dentistry, S.N.U., by age and sex, month and year. The results are as follows; 1. 1958 to 1962, 1730 patients were visited. And male patients are superior in number by the ratio 51.38% (889) : 48.61% (841) 2. The age group of 21-30 are most superior in number and it occupied perage, the patients are decreased by the number. 3. The number of patients are rare in March and in 1962 for 5 years. 4. characteristics of educational clinic are evident, for example; summer and winter vacation, term and curriculum etc. 5. It is suggested that dental treatments are related to political and economical current, and social problems.

• Journal of Families and Better Life
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• v.18 no.3 s.47
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• pp.53-70
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• 2000

This research was tried to understand the income, consumption expenditure with the family lifecycle stage of urban workers and on the basis of this to pull out the optimal consumption line and to provide the basic data for long term management of household finance. As a whole, it ti revealed that real consumption both in the period of establishment and reduction is lower than optimal consumption, whereas real consumption in the extension period is far higher than the optimal consumption in the same period. The reason amy come from that the educational expenditure of children in the middle age reaches the climax and in addition household in the same time tends to add the marriage costs supporting his children.

• Proceedings of the Korea Concrete Institute Conference
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• 2001.11a
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• pp.665-668
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• 2001

Generally, according to rising of atmospheric temperature, a consistency of concrete decreases, and a slump property of concrete is changed to be large. Also, in the strength development of concrete, the strength development rate of long-term age(28day) in comparison to strength of early age(7day) and the absolute compressive strength decreases. Accordingly, in this study, experiments about quality evaluation of concrete utilizing Ordinary Portland Cement is carried out. As a result of experiments, there were a conspicuous change in slump of concrete due to temperature increase. In conclusion, the rising of atmospheric temperature was very important factor in affecting the quality fluctuation of hot weather concrete.

• Ocean and Polar Research
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• v.25 no.1
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• pp.1-7
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• 2003

The purpose of this study was to determine changes in the growth rates and the degree of shell bioerosion exhibited by endolithic organisms of the Japanese scallop family, Patinopecten (Mizuhopecten) yessoensis, on the coast of Furugelm Island (Peter the Great Bay, northwest of East Sea = Sea of Japan) over the last three decades. The areas studied are affected by lumen (Tumangang) River run-off, which is enriched by organic matter and polluting agents. It was found that the linear growth rates of the Japanese scallops living along the coasts of Furugelm Island have decreased over the last three decades. The degree of bioerosion of scallop shells has significantly increased for the same period. These phenomena may be explained by a gradual increase in bottom sediment silting, organic enrichment and pollution of the areas being studied. It was found that the degree of scallop shell bioerosion increased with the scallop's age. At present, In each age group, the shells of the scallops sampled from the muddy sand showed greater erosion than the shells of individuals collected from the sandy substrate.