• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.5 no.2
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• pp.160-171
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• 1995

The size characteristics of lead particle which is one of the important factors associated with absorption of lead were ignored in establishing lead standard. This study was conducted to investigate distribution of lead particles by operation of industry. Aerodynamic Mass Median Diameters (MMD) of airborne lead particles in the battery and litharge manufacturing industry were $14.1{\mu}m$ and $15.1{\mu}m$, respectively. There was no significant difference between those two values(p>0.05). However, the diameters in radiator manufacturing and secondary smelting industry were $1.3{\mu}m$, $4.9{\mu}m$, respectively. Those were significantly smaller than the particle sizes in other industries(p<0.05). Total lead concentrations in the secondary smelting industry were higher than those in the battery and litharge manufacturing industry. Total lead concentrations in other industries except radiator manufacturing industry exceeded the standard of $50{\mu}g/m^3$. Only radiator manufacturing industry indicated lead concentrations significantly lower than those in other industries(p<0.05). Concentrations of lead particles smaller than $1{\mu}m$ defined as respirable fraction by OSHA's CPA model assumption were $72.4{\mu}g/m^3$ in the secondary smelting industry, exceeding $50{\mu}g/m^3$. The relationship of concentrations between total lead and lead of particles smaller than $1{\mu}m$ was log Y = 0.46 logX + 0.06(n=119, $r^2=0.44$, p=0.0001). Relationship of respirable lead concentrations between OSHA and ACGIH was significantly detected in the litharge and battery manufacturing industry(p=0.0001), but was not significant in the radiator(p=0.2720) and secondary smelting manufacturing industry(p=0.2394). As MMDs of lead particles generated in industry were small, difference of respirable lead concentration between OSHA and ACGIH became smaller. There was a significant difference between concentrations respirable lead defined by two organizations such as OSHA and ACGIH in the battery and litharge manufacturing industry. Average concentration of respirable lead by ACGIH definition was 43.3 % of total lead in secondary smelting and 48.9 % in radiator manufacturing industry, and lower fractions were indicated in battery and litharge manufacturing industry. Relationships of total lead with IPM, TPM, and RPM were significant respectively(p=0.0001) and lead concentrations by particle size could be estimated using this relationship. Linear regression equation between total lead concentration(X) and ACGIH-RPM concentration(Y) was log Y = 0.76 log X - 0.40($r^2=0.89$, p=0.0001).

• The Korean Journal of Rehabilitation Nursing
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• v.5 no.1
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• pp.7-17
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• 2002

The purpose of this study was to investigate the effect of taping therapy on activities of daily livings (ADL), hand function and range of motion in poststroke-hemiplegic patients. Sample were selected from 20 poststroke-hemiplegic patients at public health center in the period from September 5 to November 21, 2001. The research design was one group pretest-posttest design. The hemiplegia period of the participants was from one year to five years. The pretest and posttest included measuring activity of daily livings(ADL), instrumental activity of daily livings(IADL), hand function, range of motion, quality of life. In this research design, a treatment were to expose taping therapy who were received self-help management program. This self-help management program was composed of five sessions and each session had health education on stroke, diet, risk factor, ROM exercise and recreation. 20 patients were treated with kinesio taping(Nippon Sigmax Co., Ltd., Benefact(r), width 50mm). Tapes were applied to the Deltoid, Supraspinatus, Infraspinatus, Brachioradialis with paralyzed upper extremity. The taping therapy was performed once a week for 5 weeks. SPSS Win 8.0 was used for the data analysis. The results of this study were as follows: 1) The score of BADL was increased from 30.5 to 33.95 after program, and that was statistically significant(p=.019). 2) The score of IADL was increased from 11.6 to 12.75 after program, but that was statistically insignificant(p=.161). 3) The score of hand function was increased from 17 to 20.35 after program, and that was statistically significant(p=.026). 4) The shoulder's ROM(p=.000) and wrist's ROM(p= .004) were significantly increased. According to the results of this study, taping therapy is effective for improving ADL, hand function, ROM, quality of life. However, this study found no significant differences in IADL. Consequently, these findings showed that the taping therapy was effective in improvement of physical aspects(BADL, hand function, upper extremity's ROM) in poststroke-hemiplegic patients.

• Journal of Food Hygiene and Safety
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• v.26 no.1
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• pp.43-48
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• 2011

For the application of nano-sized material in various fields, the evaluation of nano-sized material toxicity is important. In the present study, various concentrations of 200 nm-sized silicon dioxide nanoparticle suspension were intraperitonially injected into mice to identify the toxicity of silicon dioxide nanoparticle in vivo. In the hematological analysis of group II treated with silicon dioxide nanoparticle 100 mg/kg body weight, lymphocytes and monocytes were significantly different compared to the control group. In group III treated with silicon dioxide nanoparticle 200 mg/kg body weight, lymphocytes, monocytes and hemoglobin were significantly different compared to the control group. In blood biochemical analysis of group III, the concentration of AST, ALT, BUN, and creatinine were significantly different compared to the control group. Histopathologic examination of the kidney indicated a mild injury only in mice received 200 mg/kg silicon dioxide nanoparticle. According to the results of the present study, the significant differences in the hematological and blood biochemical analyses and abnormal histopathological findings in the mouse kidney may have been related to exposure to silicon dioxide nanoparticle.

• Journal of the Korea Convergence Society
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• v.6 no.4
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• pp.213-223
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• 2015

Objectives : Seventh-day Adventists is well known to place a strong doctrinal emphasis on healthy life style that do not consume tobacco, alcohol or pork, and many adhere to a lacto-ovo-vegetarian lifestyle. This study aimed to investigate the difference of mortality between Korean Seventh-day Adventists and the general Korean population. Methods : We got 592 mortality data of Adventist cemetery in Seoul city and Kyunggi provincce of Korea, which contains information on causes of death for 2000-2004. Also we used mortality data of the general Korean population in Korea National Statistics Office for 2000-2004. Results : The mean age at death was 70.45 in Korean Adventists, 65.63 in the general Korean population. Higher neoplasm cause of death, such as of stomach, liver and breast, were observed in Korean Adventists than the general population. The death cause of injury, poisoning and external causes, and cerebrovascular disease were higher in the general population than Korean Adventists. The death cause of stomach cancer was lower in Korean Adventists who had above 10 years religious period than general population above age 50 years. In male, the death cause of lung cancer was lower in Korean Adventists than the general population. Conclusions : The results point to the importance of healthy life-style in Korean peoples, and indicate that lifestyle changes in the population might change the causes of death.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.11
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• pp.324-334
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• 2019

This study investigates the characteristics of patients hospitalized at a convalescent hospital, by considering patient groups based on their medical record information. It further analyzes and correlates the factors, thus providing basic data required to improve the patient classification system at convalescent hospitals. The data includes total information of 213 medical records of patients discharged from a convalescent hospital in the Jeonbuk region during a period of one year, from January to December 2016. The study examines and correlates the days of hospitalization and the number of diseases, revealing a positive correlation having a correlation coefficient, thereby indicating that infliction with a greater number of diseases results in longer hospitalization. Based on these findings, the study raises the need to revise and supplement items on the patient assessment report to help determine the patient groups and identify medical efforts to be actually provided to patients. In addition, a proper care service system for each patient group based on their respective problems that are intensively managed according to the patient groups will be an essential element in the efficient management of convalescent hospitals. Furthermore, an important task addressed will be in managing the health of the elderly population at the national level.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.3
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• pp.346-352
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• 2018

This study was conducted to investigate the quality of sleep of university students according to smoking behavior and to generate basic data for use in development of smoking prevention and smoking policies for university students and young adults in their 20s. The quality of sleep of 291 college students was measured based on smoking behavior and the Pittsburgh Sleep Quality Index (PSQI) questionnaire from May 29, 2017 to June 3, 2017. Multiple logistic regression analysis with step-wise analysis revealed that the quality of OR increased from 2.542 to 2.820 times as the grade increased, and that OR was 3.126 times higher than that of non-smokers and stop-smokers. The quality of sleep worsened with OR=12.388 times. Among general smokers, 72.4% of the students had poor sleep quality, but 82.6% of the students who did not have good sleep quality of electronic-cigarette or tobacco smokers had electronic-cigarette or tobacco worse than regular tobacco.Based on these findings, quitting smoking is essential to improve quality of sleep, but this can be difficult. Therefore, it is necessary to develop legal regulations and policies at the national level. Moreover, a system or service that can manage phased smoking cessation is needed.

• Clinical and Experimental Pediatrics
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• v.52 no.12
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• pp.1311-1320
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• 2009

Childhood obesity has rapidly increased in Korea during the past 20-30 years. Approximately 1 of 10 children and adolescents is obese. Appropriate prevention and intervention measures urgently need. Obesity prevention starts early in life, i.e., obesity prevention and education begins during the period of fetal development in utero. Behavioral changes are the most positively reflected during pregnancy. Infants should be fed breast milk, and inculcated with healthy eating and behavioral habits during infancy to ultimately establish a healthy lifestyle in children. For achieving a lifestyle and behavior that successfully allow children to overcome obesity, although individual motivation is important, active support of parents and family members is also imperative. Health care providers should also make an effort to actively prevent obesity and take necessary intervention actions. Although the efforts of individuals, family, and healthy care providers are important to prevent the rapid increase in obesity, primary prevention should be encouraged at a higher level. Schools should specifically aim at improving nutrition and physical activity by allocating times for healthy eating, playing, and physical education. Moreover, local communities should provide support by funding for safe recreational environments, such as playgrounds and walking tracks. Public health strategies in community and national policies, such as city planning, food marketing, and advertisements, are required for primary prevention of obesity.

• Journal of Preventive Medicine and Public Health
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• v.28 no.3 s.51
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• pp.640-650
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• 1995

After the introduction of National Medical Insurance in 1989, the medical demand has rapidly increased. The impact of increased medical demand was followed by an increase in the number of claims in need of review. We studied a new, fair method for reducing the number of claims reviewed. We analysed 90,583 outpatient claims submitted between September and October; claims were made for services given August of 1994. We finally suggested a screening system for claims review using a statistical method of discriminant analysis of the medical costs. The results were as follows. 1. In the cut-off group, age, days of medication, number of hospital or clinic visits, and total charge were significantly high. The cut-off rates according to the hospital-type and existence of accompanied disease were significantly different 2. According to ICD, the cut-off rate was highest in peripheral enthesopathies and allied syndromes(20.76%), lowest in acute sinusitis(0.93%). The mean charges were significantly different according to ICD and existence of cut-off. 3. We build discriminant functions by ICD with such discriminant variables as patient age, sex, existence of accompanied disease, number of hospital or clinic visits, and 9 detailed hospital or clinic charges included in claim. 4. We applied the discriminant function for screening those claims that were expected to be cut-off. The sensitivities comprised from 40% to 70%, and specificities from 70% to 95% by ICD. Acute rhinitis had highest sensitivity(100.00%) and other local infections of skin and subcutaneous tissue had highest specificity(98.45%). The expected number of cut-off was 17,762(19.61%). The total sensitivity was 49.62%, the total specificity was 82.57% and the error rate was 19.66%. We lacked economic analysis such as cost-benefit analysis. But, if the new method of screening claims using discriminant analysis were applied, the number of claims in need of review will reduce considerably.

• Journal of Preventive Medicine and Public Health
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• v.31 no.1 s.60
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• pp.27-48
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• 1998

This study was conducted to integrate the results of studies which evaluated or identified the risk factors of CVD(cerebrovascular disorders) for Koreans. We retrieved the literature published in Korean by manual search and the English literature by Medline database to identify studies on the relationship between reported risk factors and CVD conducted for the Korean from 1980 to August, 1997. Hypertension and total serum cholesterol were selected as subjects of quantitative meta-analysis on risk factors of CVD in Koreans. The overall effect sizes of the risk of CVD due to hypertension and total serum cholesterol were calculated by common odds ratio(OR) and average standardized mean difference, retrospectively. Before the integration of each effect sizes into common effect sizes, the heterogeneity tests were conducted. Also, sensitivity tests were conducted for the estimated common effect sizes. Regarding hypertension and CVD, a total of 9 epidemiologic studies were identified with a total of 2,271 cases of CVD. The overall OR of hypertension associated CVD was 4.10(95% confidence interval[CI] 3.56 to 4.71). The OR of hypertension associated with hemorrhagic CVD and ischemic CVD were 6.56(95% CI : 4.92 to 8.80) and 3.28 (95% CI : 2.77 to 3.90), retrospectively. The OR of hypertension in relation to hemorrhagic CVD was significantly higher than that of hypertension in relation to overall CVD or ischemic CVD. Regarding total serum cholesterol and ischemic CVD, total 9 epidemiologic studies were identified with a total of 843 cases of ischemic CVD. Average mean difference as an effect size was 0.76, which was judged an important value according to Cohen's criteria. Our data suggested that hypertension was an important risk factor of overall CVD and its subtypes, and that the total serum cholesterol was associated with ischemic CVD in Koreans. For the lack of reliable prospective studies, however, we concluded that further research designed longitudinally would be required in this area.

• Journal of Preventive Medicine and Public Health
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• v.50 no.6
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• pp.401-410
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• 2017

Objectives: The purpose of this study was to examine the associations of childbirth, breastfeeding, and their interaction with breast cancer (BC) risk reduction, and to evaluate the heterogeneity in the BC risk reduction effects of these factors by menopause, hormone receptor (HR) status, and pathological subtype. Methods: BC patients aged 40+ from the Korean Breast Cancer Registry in 2004-2012 and controls from the Health Examinee cohort participants were included in this study after 1:1 matching (12 889 pairs) by age and enrollment year. BC risk according to childbirth, breast-feeding, and their interaction was calculated in logistic regression models using odds ratios (ORs) and 95% confidence intervals (CIs). Results: BC risk decreased with childbirth (3+ childbirths relative to 1 childbirth: OR, 0.66; 95% CI, 0.56 to 0.78 and OR, 0.80; 95% CI, 0.68 to 0.95 in postmenopausal and premenopausal women, respectively); and the degree of risk reduction by the number of children was heterogeneous according to menopausal status (p-heterogeneity=0.04), HR status (p-heterogeneity<0.001), and pathological subtype (p-heterogeneity<0.001); whereas breastfeeding for 1-12 months showed a heterogeneous association with BC risk according to menopausal status, with risk reduction only in premenopausal women (p-heterogeneity<0.05). The combination of 2 more childbirths and breastfeeding for ${\geq}13$ months had a much stronger BC risk reduction of 49% (OR, 0.51; 95% CI, 0.45 to 0.58). Conclusions: This study suggests that the combination of longer breastfeeding and more childbirths reduces BC risk more strongly, and that women who experience both 2 or more childbirths and breastfeed for ${\geq}13$ months can reduce their BC risk by about 50%.