- Gas diffusion effect on Nifedipine in coal workers pneumoconiosis by radio-opacity size.
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Yong Hee Cheon
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Korean J Prev Med. 1989;22(3):323-327.
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- Carbon monoxide diffusing capacity(DLco) was evaluated before and after nifedipine administration in coal workers' pneumoconiosis by the size of radioopacity. Nifedipine was administered to 18 men and 17 men of small round opacity group and large opacity group respectively. Placebo was administered to 19 men and 15 men of small and large opacity group respectively. In large opacity group DLco was increased after nifedipine administration. But, it was not significant statistically(0.05 < p < 0.01). In other groups, there were no significance difference between and after medication.
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Summary
- The Relationship between the Cause of Death and Life Expectancy by FEV in Coal Workers Pneumoconiosis.
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Yong Hee Cheon, Kyung Yong Koh
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Korean J Prev Med. 1989;22(1):25-28.
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- Sixty-two medical records of patients with coal workers' pneumoconiosis who died in hospital as coal workers' pneumoconiosis were analyzed for study of the relationship between forced expiratory volume in one second(FEV1) and life expectancy in coal workers' pneumoconiosis. In the group who died of asphyxia from hemoptysis, life expectancy were well fitted with FEV1 (p<0.05). But others were not well fitted to simple linear regression equation. The prevalence of ECG sign of cor pulmonale was more in the group of cardiorespiratory failure than asphyxia group. So, in the case of far advanced cor pulmonale, it was difficult to predict life expectancy by simple linear regression equation.
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Summary
- Quantitative Analysis of Quartz, Mica, and Feldspar in Respirable Coalmine Dust in Taebaek Area by Fourier Transform Infrared Spectrophotometry.
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Ho Chun Choi, Yong Hee Cheon, Hae Jeong Kim, Jeong Joo Lee
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Korean J Prev Med. 1988;21(2):271-283.
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- A Fourier transform infrared spectrophotometric method was described for the determination of quartz, mica(sericite) and feldspar(potassium feldspar) in respirable dust in Taebaek area. The results were as follows; 1) The concentration of minerals were determined from the intensity of absorption peak of quartz at 799 cm-1, sericite at 539 cm-1, and potassium feldspar at 648 cm-1 respectively. 2) The precision(C. V. %) for the quartz determination was 7.70+/-2.68 % from 10 to 200 microgram of quartz. 3) The precision for the sericite determination was 16.34+/-6.82 % from 30 to 500 microgram of serictite. 4) The precision for the potassium feldspar determination was 5.28+/-1.74 % from 30 to 500 microgram of potassium feldspar. 5) The concentration of respirable dust in Taebaek area was 4.90+/-3.29 mg/m3(0.4-93.7%), percent quartz was 1.80+/-4.14% (0.01-20.56%), percent sericite was 11.37+/-6.43% (0.00-29.69%), percent potassium feldspar was 8.15 % (n=7, 3.41-19.70%). 6) The difference of respirable coal dust, quartz, and sericite concentration in drilling, coal cutting, hauling and separating was significant respectively (p<0.05).
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Summary
- Forced Expiratory Volume in One Second and ECG Sign of Cor Pulmonale in Coal Workers' Pneumoconiosis .
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Yong Hee Cheon
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Korean J Prev Med. 1988;21(2):267-270.
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- The medical record of ECG and pulmonary function test of 297 cases who were dead at hospital or admitted as coal workers' pneumonociosis were used for the study of the relationship between forced expiratory volume in one second(FEV1.0) and ECG sign of pulmonale. The incidence of T wave inversion in V1 lead was significantly increased as FEV1.0 decrease. The incidence of T wave inversion in V1 lead was over the half in the group of FEV1.0 less than 0.7 liter.
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Summary
- Change of FVC, FEV1 after Discontinuance of Bronchodilator in Coal Workers' Pneumoconiosis Patients.
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Yong Hee Cheon
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Korean J Prev Med. 1988;21(2):245-250.
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- For the evaluation of change of FVC and FEV1 after discontinuance of bronchodilator in the coal workers' pneumoconiosis patients, 17 pairs of patients were selected. They were matched by the age(+/-5 y.o.) and the type of ventilatory impairment. Pulmonary function was measured 2 times bimonthly before and after the drug discontinuance discontinued after measurement of PFT for 2 times. In case group the bronchodilator was discontinued after measurement of PFT for 2 times. In control group there was no interruption of medication. FVC, FEV1 decreased in both group as measurement progress. Simple linear regression coefficients against the month of measurement were calculated in both group and tested for parallelism between two groups. The results of test revealed that both regression coefficients were parallel. So in conclusively, discontinuance of medication of bronchodilator for coal workers pneumoconiosis patients has no effect on the decreasing rate of FVC, FEV1.
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Summary
- Quartz Concentration and Respirable Dust of Coal Mines in Taeback and Kangneung Areas.
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Ho Chun Choi, Yong Hee Cheon, Young No Yoon, Hae Jeong Kim
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Korean J Prev Med. 1987;20(2):261-269.
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- In order to investigate working conditions of underground coal mines, this work was undertaken to evaluate the respirable dust and the concentration of quartz in Taeback and Kangneung areas. The concentration of quartz was determined by Fourier Transform Infrared Spectrophotometry. The results were as follows; 1) The concentration of respirable dust of drilling and coal face in Taeback and Kangneung areas were as followed. 2) Distribution of respirable dust was well fitted to the long-normal distribution and geometric mean value was log(-1) 0.37+/-log(-1) 0.47 (2.34+/-2.95) mg/m3. 3) The difference of respirable dust concentrations in Taeback and Kangneung areas was not significant statistically (p>0.05). 4) The concentration of quartz of drilling and coal face in Taeback and Kangneung areas were as followed. 5) Distribution of quartz concentrations was well fitted to the log-normal distribution and geometric mean value was log(-1) 0.33+/-log(-1) 0.45 (2.14+/-2.82)%. 6) The difference of quartz concentrations in Taeback and Kangneung areas was not significant (p>0.05), but significant at drilling sites and coal faces (p<0.05).
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Summary
- Serum Immunoglobulin Levels in Coal Workers' Pneumoconiosis.
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Ho Keun Chung, Yong Hee Cheon, Jeong Pyo Hong
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Korean J Prev Med. 1987;20(2):247-254.
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- Serum Immunoglobulin (Ig)A, IgG, IgM, levels were measured in 99 coal workers' pneumoconiosis (CWP) patients and 12 healthy coal workers and 9 non-miners to compare with each group by the radiological categories, its complications and working period in coal mine. Serum were measured by nephelometry. The findings were as follows: 1) Serum IgA levels were significantly different between three groups of CWP patient, healthy coal worker and non-miner (mean+/-standard deviation: 226.4+/-87.7, 221.3+/-45.1, 170.1+/-65.7 respectively). 2) There were no significant differences of Ig levels among radiological categories of CWP. 3) There were no significant differences of Ig levels among simple pneumoconiosis and its complicated disorders. 4) The three Ig levels were slightly increased in the group of mining years less than 20 years (IgA: r=0.1869, p<0.10 IgG: r=0.2902, p<0.05 IgM: r=0.2889, p<0.05).
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Summary
- A Study on Occupational History of Coal Workers' Pneumoconiosis.
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Ho Keun Chung, Yong Hee Cheon, Kyung Young Rhee, Jeong Pyo Hong
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Korean J Prev Med. 1987;20(1):158-164.
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- The purpose of this study is to analyze occupational history of coal miners with pnemoconiosis. In this study, occupational chracteristics of 49 coal miners with pneumoconiosis were compared with those of 45 coal miners without pneumoconiosis but in similar age category (43-52 years of age) based on interview survey. Various indices on occupational characteristics were developed for the following areas: duration of employment, perception of working condition, working density, dust concentration, temperature, humidity, and experience of respirator wearings. Perception of working condition were measured in 5 points scales but experiences of respirator wearing was measured in 3 points scale. Each index was multiplied by duration of employment. From the analysis, only the experience of respirator wearing showed statistically significant difference between the two groups. Therefore, respirator wearing seemed to be effective in reducing occurrence of pneumoconiosis.
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Summary
- Changes of Forced Vital Capacity and Forced Expiratory Volume in one second of hospitalized Pneumoconiosis Patients.
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Yong Hee Cheon, Ho Keun Chung, Young Hahn Moon, Ho Young Chung
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Korean J Prev Med. 1986;19(2):314-321.
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- Forced vital capacities (FVC's) and forced expiratory volumes in one second (FEV1.0's) of 26 pneumoconiosis patients were checked at admission and were followed up for 10 months through hospitalization. FVC's and FEV1.0's were slightly improved in 10 months after admission. The improvement of FVC's was statistically significant. In the group of large opacities in chest radiographs, FVC's and FEV1.0's were lower than those values in small opacity group at admission but improved more progressively. Similar finding was noted in the group of emphysema; those values were lower at admission but improved more progressively than those of non-emphysema group.
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Summary
- Study on Subjective Symptoms that was Complained by Organic Solvent Handling Workers.
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Yong Hee Cheon, Young Hahn Moon
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Korean J Prev Med. 1984;17(1):295-298.
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- The subjective symptom and other responded relations for 69 male workers handling organic solvent in xxx a pharmacy as exposure group and 87 male workers in noise workshop were studied and analyzed. It was concluded as follows. 1. The age of both exposure group and control group with the subjective symptom indicated a negative correlation. 2. Drinking and smoking of the exposure group complained of the subjective symptom shown the negative correlation and the control group also shown the positive correlation. 3. The occupational experience of the exposure group complained of the subjective symptom indicated the negative correlation and the control group also indicated the positive correlation.
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Summary
- Study on Applicability of Predictive Equations of Subjective Symptoms of Workers Using Organic Solvents in Certain Factory.
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Yong Hee Cheon, Young Hahn Moon, Dae Kyu Oh
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Korean J Prev Med. 1983;16(1):31-34.
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- For the study of the applicability of predictive equation of subjective symptoms of workers using organic solvents, 67 male workers using organic solvents were selected. The predictive equation was quotated from previous Cheon's study. All the datas of necessary variables were gained. The predictive values and observed values were compared. The results were summarized as below; 1. The difference between predictive values and observed values were characteristically large. The coefficient of determination between the two values was 0.0024. 2. The R2 value of multiple stepwise regression equation derived from present study was 0.2827.
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Summary
- Study on Variables Concerning the Complaining Self-sensing Symptoms of Workers using Lacquer-Thinner.
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Yong Hee Cheon
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Korean J Prev Med. 1982;15(1):213-218.
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- Self sensing symptoms were surveyed by interview from the workers usig lacquer-thinner(Male 35, Female 28). And the data was converted to point. Independent variables were state of the medication, education, alcohol difinking, smoking, living and past occupational history. Dependent variable was the point. The relationship between independent variables and the depenent variable was studied. The result of the study were briefly summarized as below. 1. The difference of point between sex and medication statement was ;significant by statistical test. 2. Age and past occupational history were not important variables. 3. The Multiple Stepwise Regression Equation obtained by this study was not useful.
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Summary
- Dental Erosion in two Factories using Acids.
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Yong Hee Cheon, Ho Kwun Kwon, Young Hahn Moon, Jae Hoon Roh
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Korean J Prev Med. 1982;15(1):83-88.
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- Acid erosion of teeth was studied in two factories. The A was the textile factory possessing dyeing process using acids. The B was the metal product manufactof,ing factory possessing electroplating process. The control group was selected at the same factory not exposed to acids. The results were summarized as below. 1. The pH of saliva was the range of 6.6+/-6.8 in both factories. 2. The prevalence rate of erosion of teeth was higher in case group at ,the B. It was statistically significant. 3. The rate of erosion of incisor were the range of 12%16% (case group), 7%21,0,o (control group) at the A and 10%-20%(case group), 2%-5%(control group) at the B. 4. The rate of erosion of degree 3 which is necessary for conforming, owing to occupational induction, were 8.9% (incisor: A) and 6.8/0,o(incisor: B).
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