• Conservation Science in Museum
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• v.17
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• pp.101-116
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• 2016

Ceramic cultural artifacts restored with gypsum-based materials are prone to decay over time due to gypsum's natural absorption and release of atmospheric moisture, often leading to distortion and peeling of painted layers. This study proposes a new restoration material which utilizes extra hard stone, significantly superior in strength to regular gypsum. In order to enhance its physical properties and make it suitable for restoration of ceramics, extra hard stone is mixed with metakaolin. This mixture far surpasses regular gypsum in compressive strength(119MPa vs. 26MPa) while also maintaining a much lower wear rate(0.88% vs. 2.53%). Furthermore, the water absorption rate(2.9%) of the mixed material is over five times lower than that of regular gypsum(17.2%). When examined using a SEM(Scanning Electron Microscope), this mixture also proved superior to extra hard stone in terms of hardened density. The addition of metakaolin increases the mixture's strength and water resistance over that of extra hard stone and also improves its surface density, making it ideal for the restoration of ceramics. It has already been used to repair ceramic objects in the Museum's collection: Clay basin(sinan 18892), Buncheong ware bottle with incised peony design(jubsu 2034), Buncheong ware bowl with chrysanthemum(jubsu 1730). Results thus far have shown the mixture to be easy to inject and layer as well as harden into an even surface, which allows for smooth application of paint for color matching.

• Journal of the Korean Society of Food Culture
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• v.26 no.4
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• pp.354-363
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• 2011

This study aimed to find the differences in weight control status and eating behavior of satisfied and dissatisfied female high school students regarding their own body shape. The participants consisted of 238 students at two female high schools in Nonsan-si, Chungnam-do in May of 2008. Self-assessment evaluated present body shape and ideal body shape they would like to have by providing silhouette drawings. The subjects were divided into two groups, 'satisfied' and 'dissatisfied', according to the differences between present body shape and ideal body shape. In the distribution of subjects according to body mass index, 100% of overweight, 97.0% of normal weight and 48.7% of underweight belonged to the dissatisfied group. There were significant differences in weight control and eating behavior between dissatisfied and satisfied groups in terms of frequency and reasons of conducting weight control behavior, body weight return after weight reduction, skipping breakfast and consuming fast food. The satisfied group was two times more likely to not conduct weight control behaviors compared to the dissatisfied group. The main reason for trying to control weight differed according to the group; the reason was feeling fat in the dissatisfied group and desiring to be healthy in the satisfied group. The percentage of subjects that returned to their original weights after weight reduction was 5 times higher in the dissatisfied group. The percentages of subjects that regularly skip breakfast and consume fast food were both higher in the dissatisfied group than in the satisfied group. The dissatisfied group responded 'eating alone' more frequently among nine binge eating behaviors compared to the satisfied group. Both groups, however, did not show any difference in overeating of meals, eating speed, intake frequency of regular meals, food preference, preferred cooking method, carbonated beverage intake and snack eating behavior. In summary, the dissatisfied group tried more unnecessary body weight reduction and had poor eating behavior. Accordingly, to correct the biased perception of body shape by the majority of female high school students, the values of our society should change toward the pursuit of beauty of health.

• Journal of the Korean Dietetic Association
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• v.18 no.2
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• pp.186-199
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• 2012

The present study was conducted to investigate dietary habits and biochemical indices according to the obesity index of elementary school students visiting a hospital for diagnosis. The subjects of this study were 150 elementary school students and their mothers. The overweight rates of child subjects were 37.5% for males and 40.9% for females, whereas the rates of underweight children were 35.0% for males and 14.5% for females. Children's obesity index significantly decreased with an increase in the average monthly income of children's families. Children's obesity index, mothers' weights, BMI, and percent ideal body weight were all positively correlated. Blood biochemical values in children (hemoglobin, hematocrit, albumin, globulin, glucose, total cholesterol, and triglyceride levels) and their obesity index also showed positive correlation. For the underweight group, the frequency of iron-deficiency anemia was significantly high, whereas for the overweight group, the frequency of dyslipidemia was high. There was a significant increase in children's obesity index and a decrease in frequency of regular exercise with time spent on the TV/computer. The normal weight group recorded the highest total scores for mothers' nutritional knowledge, whereas the overweight group recorded the lowest total scores. Therefore, to maintain healthy weight in children, nutritional education programs for mothers and children should be developed.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.16 no.6
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• pp.147-152
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• 2016

Wireless sensor networks that are easy to deploy and install are ideal for building a system that monitors the condition of the equipment in a factory environment where wiring is difficult. The ZigBee has characteristics of low price and low power compared with other wireless communication protocols and is suitable for a monitoring system requiring a plurality of nodes. ZigBee communication requires encryption security between devices because all protocol layers are based on OTM trusted by each other. In the communication between nodes, node authentication must be guaranteed and exposure of confidential information managed by each node should be minimized. The facilities of the factory are regular and stationary in distribution location. In order to protect the information gathered from the sensor in the factory environment and the actuator control information connected to the sensor node, we propose a cryptosystem based on the two - dimensional grid - based key distribution method similar to the distribution environment of the facility.

• Journal of Periodontal and Implant Science
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• v.30 no.3
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• pp.527-538
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• 2000

Several extraction cases with advanced bone loss as a result of periodontal disease, root or labial bone fracture, extensive caries, and periapical lesions occur esthetic, functional problems and severe bone loss. Therefore, to treat these cases used several surgical methods and socket preservation among this therapies have been evaluated simple, effective and good prognosis in the implant placement. Socket preservation therapy have been used with barrier membranes or/and graft materials. Deproteinized bovine bone mineral have been evaluated ideal grafting materials. Recently, calcium-phosphate thin film coated bovine bone powders were developed in our country, but the study for these material wasn't reported. When two types of xenograft materials were implanted in extraction sockets of Beagle dogs, the effects of these were analyzed after 4 weeks and 8 weeks histological views. The results of this study were as follows. 1. In control groups, 4 weeks after implantation, the extraction sockets were filled with connective tissue which has dilated vessels and epithelial growth. And after 8 weeks, irregular connective bundles were observed. But new bone formation was not seen. 2. In Bio-Oss groups, epithelial growth was not seen and bone powder was covered with connective tissue fiber. New bone formation was found around the interproximal bone. There was no special change seen after 8 weeks, connective tissue fibers became more regular, and bone growth near bone powder was not made well. 3. In Ca-P BBP groups, epithelial cells didn't grow in the extraction sockets, there was a lot of new bone made around the bone powder after 8 weeks, new bone around bone powder was replaced with mature bone. It is thought that bone powder grafting into the extraction sockets is very useful for conservation of ridge, and Ca-P BBP is more effective in bone formation than Bio-Oss.

• Korean Journal of Human Ecology
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• v.12 no.4
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• pp.463-495
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• 2003

The purpose of this study was to obtain a fundamental data for developing a policy concerning women and child rearing and a parent education program for young parents who are around their childbirth, a period crucially important both for the parents in terms of the role adjustment, career management, and family finance, and for the infants in terms of its physical and psychological well-being. The subjects were 509 mothers before and after childbirth currently living in the Metropolitan City of Daejeon. Data were obtained through questionnaires and interviews in two major areas of pregnancy-delivery-childcare and parent education. Data were analyzed using SAS, mostly through frequency analysis, percentiles, t-tests, and F-tests. Results of descriptive analyses were organized along the following areas and issues: Pregnancy(family planning, regular check-ups, difficulties, prenatal education, costs, etc.); delivery(type of delivery, delivery related experience, costs, clinic/medical institute of choice, worries/problems, help/supports, etc.); postpartum care(place, kinds of help and helper, costs, postpartum care facilities, etc.); childcare circumstances(place, carer, time schedules, childcare centers or facilities feeding and weaning, etc.); husband's attitudes and involvement in the overall process; working mothers(maternity leave, temporary retirement for child rearing, etc.); and, parent education(family planning, pregnancy, delivery, postpartum care, child rearing, areas or issues needing parent education, facilitative and hindering factors to ideal parenting, etc.). Differences between groups of pregnant mothers and postpartum mothers, working- and non-working mothers, groups of different income levels, mothers and fathers of different educational levels, mothers of first pregnancy(or childbirth) and experienced mothers were also analyzed. Several conclusions with suggestions were drawn in relation to the need for strong implementation as well as developing of policies on women and childcare and for developing a new parent education program for parents before and after childbirth.

• Journal of the Korean Institute of Landscape Architecture
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• v.34 no.6 s.119
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• pp.39-53
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• 2007

Unlike conventional roof landscaping, where various kinds of plants and structures are employed, a grass roof is a roof on which herbaceous plants are grown in planting medium and which is not accessed or maintained, mainly because it doesn't have sufficient load capacity to support a regular roof garden. They are mostly built on existing roofs, whether flat slab or gabled. Planting on roofs has numerous advantages, such as creating a biotope, purifying urban air, adding moisture to the atmosphere, storing rain water, preventing flash floods, reducing energy use for heating and air conditioning, enhancing the urban landscape and providing relaxation to the city dwellers, not to mention the alleviation of global warming by absorbing $CO_2$. In addition to the general merits of roof planting, the grass roof has its own unique qualities. Only herbaceous species are planted on the roof, resulting in light weight which allows roofs of existing buildings to be planted without structural reinforcement. The species chosen are mostly short, tough perennials that don't need to be maintained. These conditions provide an ideal situation where massive planting can be done in urban areas where roofs are often the only and definitely the largest space available to be planted. If roofs are planted on a massive scale they can play a significant role in alleviating global warming, heat island effects and energy shortages. Despite the advantages of grass roofs, there are some problems. The most significant problem is the invasion of neighboring plants. They may be brought in with the planting medium, by birds or by wind. These plants have little aesthetic value comparing to the chosen species and are usually taller. Eventually they dominate and prevail over the original species. The intended planting design disappears and the roof comes to look wild. Since the primary value of a grass roof is ecological, a change in attitude towards what constitutes beauty on the roofscape is necessary. Instead of keeping the roof neat through constant maintenance, people must learn that the wild grass with bird's nests on their roof is more beautiful as it is.

• Korean Security Journal
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• no.5
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• pp.327-350
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• 2002

We, in Korea, have over two hundred hypermarkets and the number is continuously increasing. We drop into a hypermarket for merchandise, which is an integral part of our life style. So, we should consider safety for employees as well as customers because hundreds of thousands of people use the hypermarket every day. In addition to this consideration, the government should also be a political support relating to accidents that occur in the hypermarket because security and safety matters are important to all of us. But even now, Our security conditions do not match our ideal goal and we take countermeasures after accident or loss. This is a result of not having a security management expert coupled with a chief executive officer that has no idea about security awareness and loss prevention. In addition, we do not have specific laws to address these matters. We also lack reasonable ideas to prevent accident and loss. Now is the right time to revamp the laws and ordinances to improve the quality of civilian life. Prevention of accidents is a needed investment for all security personnel. The best solution for businesses is prevention of accidents. This will increase profits and cost-effectiveness as well as increase customer satisfaction. The company should form a security management department for comprehensive protection of assets. The goal of security management employees should be productive and effective security management. Every employee should have responsibility in mind to prevent accidents in his or her work. In addition, The company should have a systematic organization in place and regular training sessions. The most effective security management comes from cooperation of all members. In the 21st century, we pursue a high standard of living which is a result of our cooperation against any accident and loss. Sennewald says The value of security is better measure by what does not happen rather than what does.

• Korean Journal of Child Studies
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• v.3
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• pp.49-62
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• 1982

This is a study to analyze rural area women's perception and practice of prenatal care, which is the fundamental of the education of children. Further, it was aimed to provide basic data for ideal childbirth, upbringing and household management process. For that object, questionnaires were distributed to women living in Yongdong region to judge the level of general understanding on prenatal care. Research was done from three different aspects; dietary life, emotion control and health management. Percentages were drawn out to see the general tendency. The following results were discovered from data analysis: 1. Most subjects of the survey knew well about prenatal care. They had acquired that knowledge from their parents. Most thought that prenatal care is necessary. They answered that they think prenatal care has more or less effect on the fetus. The first dime they thought about prenatal care was after they found that they were pregnant. 2. The subjects knew well about dietary needs for pregnant women carried out much of what they knew. Intake of sufficiently nutritious food is somewhat difficult, but foods that are regarded as bad were avoided thoroughly. It appears that most women have much concern about what they eat during pregnancy. 3. Most of the subjects understood that the emotional stability is necessary but it wasn't put into practice so well as in dietary life. Especially, attitudes connected with emotional development like, "Look or hear only what is good (for the fetus)" were practised little. Efforts for self-restraint as "Not to hate or pick out others' defects or talk bad about others" were appeared to be great, and it is practised well, too. 4. The subjects were well-informed on health area, but practised little. Behaviors for health improvement as to "Lead a regular daily life for health" or "Not to take a long trop" were practised very faithfully. The results of the survey showed that passive attitudes related to tabooed food, self-abstinence and cautions for bodily safety were prevalent; more positive and progressive disposition missing. That is, full perception and active practices for caloric intake, emotional improvement and physical strength development are needed.

• Journal of the Korean Dietetic Association
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• v.7 no.4
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• pp.313-319
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• 2001

High serum cholesterol level is a major risk factor for coronary heart disease(CHD). Nutrition therapy of hypocholesterolemic diets with increased physical activity is the essential step in the treatment of the hypercholesterolemic patients. The purpose of this study was to evaluate the short-term effect of intensive dietary therapy combined with regular exercise in lowering serum cholesterol level. Seventy three hypercholesterolemic outpatients(mean: 268.0$\pm$24.7mg/dL), aged 34 to 73(mean: 56$\pm$9.8yrs), who visited cardiology OPD of Yonsei Cardiovascular Center from April through October, 1998 were studied. Anthropometric measurements, usual nutrient intake survey using semiquantitative food frequency questionnaire, and daily nutrient intake analysis were performed. The nutrition counseling for the hypocholesterolemic diet and exercise therapy was performed individually. After a 4 week intensive dietary therapy, comparisons of body weight, nutrient intakes, and blood lipid concentrations were evaluated for the hypocholesterolemic effect of intensive diet therapy. After 4 weeks of intensive diet therapy, significant reductions in percent ideal body weight(p<0.01), saturated fat intake(p<0.01), and cholesterol intake(p<0.01) were observed. There were significant reductions in serum total cholesterol and LDL-cholesterol levels after 4 weeks of therapy by 8.1%(p<0.01) and 9.7%(p<0.01), respectively. Our results showed that intensive dietary therapy was effective in reductions of serum total and LDL-cholesterol levels. The goal for this dietary modification should not be temporary but rather be permanent in eating behavior accompanied by appropriately increased physical activity.