• Journal of the Korean Institute of Gas
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• v.24 no.4
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• pp.84-92
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• 2020

Most facilities in chemical plants operate in environments that are outside the range of temperature and pressure that can be encountered on a daily basis, and are vulnerable to aging due to these stresses and environmental conditions. The facilities exposed to these conditions are not only likely to fail due to cumulative damage, but also lead to accidents if maintenance and replacement are not performed.Recommendation guidelines called risk-based inspection are widely used around the world-wide. However, limits exist for facilities that have already elapsed for a certain. As a result of the survey on the aging of Ulsan industrial complex in Korea, which carries out proper inspection, many of the facilities have been used for 20 years. Also, most of the facilities where the accident occurred have been in operation for more than 20 years. Therefore, this study suggested criteria for classifying devices that have exceeded a certain period of use as obsolete facilities. In addition, quantitative risk assessment was conducted. The safety investment method using the cost-benefit analysis method was proposed in order to calculate the loss cost and reduce the risk by expressing the risks of the corresponding aged facility as an Economic index. By utilizing the method of cost-benefit analysis of old facilities using the quantitative risk assessment presented in this study, it can be expected to improve the performance and life of old facilities, improve production efficiency and reliability of the system of facilities, change the recognition of safety management costs, increase employee stability, and reduce loss costs.

• Journal of the Korean Geographical Society
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• v.41 no.3 s.114
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• pp.331-345
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• 2006

This study deals with geomorphological process of the sand dune landform including the distribution and surface environments, characteristics of sediments, origins and moving processes in lower reach and mouth delta of Duman River, Northeast Korea and China. The methodology of the study includes image analysis of Landsat TM(1992.10) and ETM(2000.9) and Spot(2005.4) for analysis of land cover, 2 times field survey for recognition of landform and acquisition of sediments raw data materials, and grain analysis and exoscopy about raw data materials. The geomorphic elements from satellite image analysis are composed of the delta, sand spit, active and stable dune, sand bar and riparian vegetated zone. Results of the grain analysis indicate the sediments originated from marine coastal zone than riverine one. This means that present sand dune not so much reflect present climatic and geomorphic environments. Result of the exoscopy analysis show that ratio of quartz, which is comparatively resistant to environment, is highest as $65{\sim}83%$ out of sediments. But the surface of the $30{\sim}40%$ of mineral grains was coated by yellow-colored stained materials, due to chemical weathering. Some grains show rough skin, looking as acicular, network structure and etching pits, affected by physical and chemical weathering.

• Journal of radiological science and technology
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• v.35 no.1
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• pp.35-44
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• 2012

The goal of this study is to awaken about risk occurred by CT examination. For radio-technologists working at 'S medical center' located in Seoul, we investigated a recognition about dose and risk CT and normal X-ray examination according by working experience in hospital, experience about CT examination and radiation source. For subjects of investigation, radio-technologists working at 'S medical center' located in Seoul helped us. We collected 131 questionnaires for a test of hypothesis. Cronbach @ coefficients of questionnaires were 0.825988 and 0.767161 and a rejection rate of p-value was below 0.05. SAS 9.1(SAS Institute Inc., Cary, NC, USA.) statistic package was used for hypothesis test. We used Mann-Whitney test, Kruskai-Wallis test, Two sample T-test, Two sample T-test with Bonferroni's Correction and One-way ANOVA methods. P-values of hypothesis about dose of CT and normal X-ray examination were 0.2291 ~ 0.9663. p-values of hypothesis about risk were 0.1924 ~ 1.0000. All of hypothesis is over rejection rate(<0.05). This study shows that radio-technologists of S medical center recognized that CT has higher dose and risk than general X-ray examination.

• Quality Improvement in Health Care
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• v.10 no.2
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• pp.190-203
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• 2003

Background: Dental hygienists are at risk of acquiring infections through exposure to infectious agents. This study explores the frequency of exposure to infectious agents and infection control practices among dental hygienists. Methods: We undertook a cross-sectional survey to examine the exposure to infectious agents and infection control practices among dental hygienists through questionnaire. Data were obtained from 124 dental hygienists attending educational conferences. A multiple logistic regression analysis was conducted to determine the factors that effect infection control practices in relation to age, completion of infection control education, recognition of their own serum hepatitis Ag/Ab status, the number of one day patients, location of clinics, type of clinics, and career years. Result: Of the 124 dental hygienists, 91.7% were exposed to at least one accident such as needle stick injuries during their practices periods. The health screening coverage rate in dental hygienists was 16.5%. The number of one day patients and career years were important in relation to infection control practices among dental hygienists. The adjusted odds ratio estimates for career years were 5.049 times greater(95% Cl 1.238-20.597) for groups with over 4 career years than under 2 career years. That for the number of one day patients were 0.261(95% Cl 0.071-0.955) lower for through 20 up to 30 patients, 0.531(95% Cl 0.102-2.78) lower for through 30 up to 40 patients and 0.498(95% Cl 0.123-2.017) lower for more than 40 patients than under 20 patients. Conclusion: From these results, prevalence of infection control practices among dental hygienists is related to the number of one day patients and career years. Prevention of cross infection and reduction of future transmission should be a priority to dental hygienists for promotion of infection control and further efforts to educate newcomers on infection prevention should be made.

• Journal of Korean Public Health Nursing
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• v.12 no.2
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• pp.122-135
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• 1998

This study was carried out to understand the nursing needs of postpartum women during the postpartum period. The goal of study was to obtain data needed to develop maternal education programs and to improve the nursing quality for postpartum women. A cross-sectional survey design was employed in this study. The subjects were 101 postpartum women who had delivery at 2 general hospitals in Chung-Buk. Korea. Data were collected from Sep. 29 to Nov. 28. 1997 by means of a structured questionnaire. The instrument used for this study was the one which was consisted of revised Maternal Concerns Questionnaire (MCQ) developed by Bull (1979). The data were analyzed through the SPSS/PC+ program by use of frequency, t-test and ANOVA. The results of the study were as follows; 1) The mean score of concerns about 'self' was 2.98 for primipara and 2.80 for multipara but was not statistically significant difference. Among the items of concerns 'for self', 'Being good mothers' was the highest (primipara 3.93. multipara 3.75). 2) The mean score of concerns about 'baby' was 3.64 for primipara and 3.53 for multipara but was not statistically significant difference. Among the items of concerns 'for baby', 'Normal growth and development' was the highest (primipara 3.91. multipara 3.90). 3) The mean score of concerns about 'husband' was 3.33 for primipara and 3.06 for multipara and was statistically significant difference (t=2.11. p=0.03). Among the items of concerns 'for husband', 'Husband being a good father' was the highest (primipara 3.87, multipara 3.77). 4) The mean score of concerns about 'family' was 2.65 for primipara and 2.80 for multipara but was not statistically significant. Among the items of concerns 'for family', 'Change in the family's lifestyle' was the highest(primipara 3.01, multipara 2.93, t=-1.99, p=0.04). 5) The mean score of concerns about 'community' was 2.48 for primipara and 2.42 for multipara but was not statistically significant. Among the items of concerns 'for community'. 'Getting to health care facilities' was the highest (primipara 2.48, multipara 2.42). 6) On considering the relationship between the postpartum women's nursing needs and their general characteristics, 'regularly antenatal care' was statistically significant (t=2.29. p=0.02). In conclusion, recognition of maternal concerns can be used by nurses to identify nursing diagnoses and to develop care plans that reflect the patient's priorities.

• Journal of the Korean School Mathematics Society
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• v.5 no.2
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• pp.1-15
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• 2002

The purpose of this study came to start to be helpful in that the teachers in field produced evaluation subject about the mathematics and applied by analyzing the performance capacity for the students about the subject developed through the application of subject about the teaching-learning model that can utilize the learners' learning experience and the development of items that can evaluate it by utilizing various and concrete operational materials as an object of the first year at the middle schools. The concrete purpose of realizing it is as follows. 1. This study is to develop the teaching-learning model centered on activities adequate to utilize various and concrete operational materials. 2. This study is to develop evaluation data for utilizing the concrete operational materials by making construction through the application of developed teaching-learning model as possible. 3. This study is to present standards initiative for reliable and fair marking about the evaluation data and to analyze the students' practice capacity by using it effectively. For accomplishing the purpose of this research, this study is the work-oriented teaching and learning model using learning data that can be easily found around the surroundings and 8 evaluation programs in order that the experience-oriented learning based on circumstances learning among the learning models of constructivism. Also, it is to examine the result after applying that on a basis of 25 students, consisted of only on class in a year, in the first year at the small size of agricultural middle schools. The result of this study from this research is as follows. First, as a result of frequency survey, of response about the developed evaluation data it showed positive response more than 80% of all the items. The atmosphere of self-directed learning was produced because the developed evaluation data could induce activity-based learning naturally by stimulating the students' curiosity and promoting interest. Second, this study executed t-test for the result of questionnaire about the mathematics propensity, and there were significant differences in 19 items among 25 items. It presented that the application of data about the teaching-learning and evaluation directly using concrete operational materials to the constructional learning by level might have desirable affect on the students' mathematical propensity. It came to be a motive that could increase value recognition and interest on the subject of mathematics by investigating a mathematical principle rule and confirming it through activity learning using the concrete operational materials.

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.9 no.1
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• pp.41-55
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• 1999

In order to evaluate the effects of knowledge, attitude and practice on noise-induced hearing loss or hearing threshold level, questionnaire survey was performed and hearing thresholds of 1 kHz and 4 kHz were measured on 1,040 subjects with workers exposed to noise, safety and health officers. industrial hygienists, analysts rind office workers. The results were as follows ; 1. The following 6 factors were obtained by factor analysis and factor rotation of 30 questionnaire of knowledge, attitude and practice about noise; knowledge of noise (F1), concern of hearing protective devices (F2), concern of noise induced hearing loss (F3), concern of noise level and hearing impairment (F4), concern of noise in workplace (F5) and recognition of noised-induced hearing loss (F6). 56.1% of variance was explained by 6 factors. 2. Significant variables influencing knowledge, attitude and practice about noise were education level and age in F1, personal protective devices (PPE) and education level in F2, age and education level in F3, education level, age and sex in F4, PPE, education level, age and work duration in F5, and work duration and PPE in F6. 3. Hearing thresholds of 4 kHz were significantly higher in workers exposed to noise than that of in the other subjects and tended to be higher in industrial hygienists, safety and health officers and analysts than that of the office workers. 4. Significant variables influencing hearing thresholds of 1 kHz were age, education level, F5 and F6 in workers exposed to noise, and F1 in industrial hygienists. 5. Significant variables influencing hearing thresholds of 4 kHz were age, F6, sex, work duration, F1, F5, F2 and F3 in workers exposed to noise, F1 and age in safety and health officers, and F6, sex and F4 in industrial hygienists. With the above results, it suggested that workers exposed to noise be needed the education of knowledge, attitude and practice about noise in hearing conservation program for the prevention of noise induced hearing loss. Also, it suggested that health managers in workplace be needed countermeasures to prevent hearing loss although they are intermittently exposed to noise.

• Journal of the Korean Society of Radiology
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• v.1 no.1
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• pp.5-10
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• 2007

A survey was conducted to examine the major that is Radiological, Food and Biotechnology in S city of the Chung nam by the self-administered questionnaire. Data was collected total of 208 participants with the 93 male subjects and 115 female subjects The results of this study can be summarized as follows; 1. Out of 208 subjects participants with the 81 subjects(38.9%) was answered that I was knowed of the food irradiation, the greater part of the Food and Biotechnology wasn't know, 32 subjects(15.4%) of the respondents to the Radiological science did extremely much know. 2. If one of the an institution or organization of the most trustworthy scientific investigation proved willingly make a purchase to use irradiated food. the acceptance of irradiated food significantly decreased the mean scores of concern about a sex and grade(P<0.204, P<0.418). 3. Recently the government doing to prevented spreading of food poisoning accidents by school lunch, out of 204 subjects with 18 subjects(8.8%) is very required, with the 87 subjects(42.6%) is generally required, therefore total of 105 subjects(51.5%) is a positive answer, there was statistical significantly increased very association between necessity of food irradiated and planing of the government follow-up measures(P<0.009).

• Journal of Korean Academic Society of Home Health Care Nursing
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• v.13 no.1
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• pp.24-32
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• 2006

The purpose of this study is to predict the degree of taking the complementary & alternative therapy in the home care nursing service and provide basic data for the application of it. To accomplish this, degree of general recognition of the complementary & alternative therapy, experiences, degree of concern, applicability of the therapy, and educational need should be studied. This study is a descriptive research survey on the home care nurses working at 73 medical centers out of 125 nationwide who provide hospital based home nursing care. The data was collected from Sep. 20, to Oct. 20, 2004 by ChoiHeyran's questionaries (2002). The data was analyzed by the frequency and the percentage. The results of this study are as follows ; 1. The degree of pre-cognition on the complementary & alternative therapy is very high. Information about the therapy was mostly obtained through medias. Home care nurses understand that he desirable treatment is to practice medical treatment and complementary & alternative therapy simultaneously. While 50% of them have already practiced complementary & alternative therapy among their patients. The most commonly used therapy is Acupressure. And Home care nurses have open and positive attitudes about the complementary & alternative therapy as to answer they aye ready to recommend it to their patients. 2. Over half of the Home care nurses met patients taking complementary & alternative therapy. 94.5% of them think scientific diagnosis on the effect of the therapy. advice from the doctor. and the special working staff is required to apply it on to the home care nursing. 3. 68.5% of the Home care nurses have taken education on the therapy through general comprehensive instructions and supplementary. Most of them want to have a opportunity education on the therapy because they want to provide comprehensive nursing and diversified nursing service. The preferred educations are Hand acupuncture, Acupressure & Massage and Aromatherapy, in that order. Based on the above results, the followings are recommended. 1. A study that stipulates the types, applications, and efficiency assessment of the complementary & alternative therapy practiced by Home care nurses in the home care nursing care procedure. And systematic and scientific nursing intervention be developed.

• Journal of the Korean earth science society
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• v.27 no.3
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• pp.279-288
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• 2006

We incorporated cooperative learning focusing on the 'Crustal Deformation' in five classes of second grade students, at an all-girls' middle school of Gimje city. The groups of cooperative learning were composed of four members of students each, according to the heterogeneous level. We conducted a pretest on the students' preference before incorporating the cooperative learning. After ten weeks of cooperative school work, the students took a post test with the same questions as the pretest. The result of this method greatly impacted the change on the students' scientific preference. It means that the students showed a positive change in their awareness of and participation in science classes, compared to before. However it is difficult to distinguish the differences in their scientific attitude on the recognition about scientists and habits which make them think scientifically. This resulted from the short period of ten weeks which is not sufficient to carry out the study strategy effectively. Surveys of the students on cooperative learning indicates that the middle level students prefer this method unlike the higher or lower level students. we are convinced that they can learn from the students of higher level and are able to help the lower level with the interaction through cooperative learning. According to the result of the survey, the method has some weaknesses; it arouses the high noise levels and consequent disturbance due to verbal interaction and of conflicts due to disagreements when they discuss the process. On the contrary, advantages are developing the students's interest in science class, helping them to learn, creating positive participation in class, and fostering mutual collaboration with other students through cooperative learning.