Annals of Occupational and Environmental Medicine

Byung Mann Cho

14 Articles

Effect Assessment of Worksite-based, Post-examination, Health Care Management System: Kang Jin Lee, Young Hee Choi, Cha Jae Oh, Hoo Rak Lee, Hyoung June Im, Moon Young Hwang, Byung Mann Cho, Ji Ho Lee; Korean Journal of Occupational and Environmental Medicine 2006;18(1):1-14. Published online March 31, 2006; DOI: https://doi.org/10.35371/kjoem.2006.18.1.1

OBJECTIVES
This study was conducted to develop a worksite-based, post-examination, health care management system for continuous and systematic management of workers with hypertension, diabetes mellitus, hyperlipidemia, and abnormal LFT detected by periodic health examination and to assess the effectiveness such a system as an intervention study.
METHODS
Study subjects were selected from workers with hypertension, diabetes mellitus, hyperlipidemia, and abnormal LFT according to the selection criteria. The intervention group, but not the control group, received medical treatment of disease, follow up examination, and health education which consisted of information about the disease and the importance of life-style modification through periodic interview using the resources of occupational health service center in the worksite. To assess the effectiveness of this system, we compared follow up examination data from the intervention group with periodic examination data from the worksite control group.
RESULTS
In the intervention group a significant reduction trend was recorded for systolic and diastolic blood pressure, fasting blood sugar, postprandial 2 hour glucose, total cholesterol, triglyceride, LDL-cholesterol, AST, ALT, and gamma-GTP, and a rising trend for HDL-cholesterol. Significant group differences ware recorded for fasting blood sugar, postprandial 2 hour glucose, total cholesterol, AST, and ALT.
CONCLUSIONS
The worksite-based, post-examination, health care management system was effective for the continuous and systematic management of workers who had abnormal findings detected by periodic health examination.

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The Change Analysis about Health Behavior and Examination Result of Periodical Medical Examiner
Tae-Yong Lee, Dal-Sik Yoon
Journal of the Korea Academia-Industrial cooperation Society.2014; 15(2): 923. CrossRef
The Effect of Metabolic syndrome Management Program Applying Participatory Action-Oriented Training Principle
Seong-Yong Yoon, Kuck-Hyeun Woo, Hwa-Sung Kim, Yong-Bae Kim, Jin-Seok Kim, Seong-Yong Jo, Sung-Soo Lee
Korean Journal of Health Education and Promotion.2014; 31(5): 81. CrossRef
The Effects of Hypertension Self-help Program on Hypertension-related Knowledge, Self-efficacy, Self-management Compliance and Physiological Parameters in Workers
Mi-Young Gi, Young-Hae Park
Korean Journal of Occupational Health Nursing.2012; 21(1): 1. CrossRef

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Risk Factor Assessment Using Surface Electromyography and Electrogoniometer among Automobile Part Manufacturers: Dongmug Kang, Cheol Ho Yee, Yong Chul Shin, Eun A Kim, Ji Hoon Woo, Byung Mann Cho, Su Ill Lee; Korean Journal of Occupational and Environmental Medicine 2005;17(4):267-277. Published online December 31, 2005; DOI: https://doi.org/10.35371/kjoem.2005.17.4.267

Abstract PDF

OBJECTIVES
As automobile part manufacturing is characterized by high speed and high repetition, observation methods which are usually utilized for static posture are inappropriate to evaluate musculoskeleatal risk factors. This study quantified the risk factors of musculoskeletal disorders on the forearm and suggested exposure limits by estimating the risk factors using surface electromyography (EMG) and electrogoniometer.
METHODS
Ten percent of the total workers at 3 automobile part manufacturing factories were randomly selected, and 99 male workers were recruited as study subjects. The study was conducted during May 2003 to September 2004. The workers were equipped with electrogoniometers on the wrist and the elbow, surface EMGs on the skin of the flexor digitorum superficialis (FDS) and extensor carpi radialis (ECR) muscles, and the heart beat recorder during work as indicators of joint movement, local muscle tension and physical work load, respectively.
RESULTS
After controlling for age, body mass index and job stress, wrist flexion maximum angle, FDS relative activity (RA) and ECR RA were significantly associated with forearm musculoskeletal symptoms. The odds ratios of the forearm were 5.0(95% CI: 1.1-22.7), 14.0(95% CI: 1.5-128.8) and 7.3(95% CI: 1.1-49.4) for wrist flexion maximum angle more than 76 degrees, FDS RA more than 2.8%, and ECR RA more than 3.5%, respectively.
CONCLUSIONS
Joint angle and focal muscle activity were associated with forearm musculoskeletal symptoms. To reduce forearm musculoskeletal symptoms among automobile part manufacturers, the wrist flexion angle, and FDS and ECR activity need to be reduced below the guidelines recommended in this study.

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Quantification of physical stress experienced by obstetrics and gynecology sonographers: A comparative study of two ultrasound devices
Yong-Ku Kong, Min-Uk Cho, Chae-Won Park, Seoung-Yeon Kim, Min-Jung Kim, Junpil Moon, Sungwon Lim, Byung-Mo Oh, Banseok Han, JunHee Choi, Kyeong-Hee Choi
Applied Ergonomics.2022; 100: 103665. CrossRef

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The Association between Pneumoconiosis and Genetic Polymorphism of GSTM1, GSTT1, GSTP1, NAT2, CYP2E1 and CYP1A1: Cha Jae Oh, Moon Young Hwang, Kang Jin Lee, Hoo Rak Lee, Byung Mann Cho; Korean Journal of Occupational and Environmental Medicine 2005;17(2):85-94. Published online June 30, 2005; DOI: https://doi.org/10.35371/kjoem.2005.17.2.85

Abstract PDF: OBJECTIVES
To investigate effects of genetic polymorphism of glutathione S-transferase M1 (GSTM1), glutathione S-transferase T1 (GSTT1), glutathione S-transferase P1 (GSTP1), N-acetyltransferase (NAT2), cytochrome P450 2E1 (CYP2E1) and cytochrome P450 1A1 (CYP1A1) on pneumoconiosis.
METHODS
Eighty-five pneumoconiosis patients and 122 age and sex matched healthy controls were enrolled. Direct interview and standard questionnaire were conducted and the genotypes of GSTM1, GSTT1, GSTP1, NAT2, CYP2E1 and CYP1A1 were investigated using multiplex PCR or PCR-RFLP methods with DNA extracted from venous blood. The relationship was investigated between the severity of pneumoconiosis and the polymorphism of GSTM1, GSTT1, GSTP1, NAT2, CYP2E1 and CYP1A1, and also with various environmental factors including smoking.
RESULTS
We observed a significantly higher rate of genetic polymorphism in pneumoconiosis patients than in normal subjects. The odds ratio (95% CI) of NAT2 was 2.09 (1.19-3.68). In addition, smoking was related significantly with pneumoconiosis (OR 2.89, 95% CI 1.40-5.95). In multiple logistic regression analyses, NAT2 and smoking were significant risk factors for the development of pneumoconiosis (OR 1.84, 95% CI 1.00-3.37; OR 2.98, 95% CI 1.40-6.35, respectively). The age of onset of the disease and smoking were significantly related with moderate or severe pneumoconiosis (OR 0.91, 95% CI 0.83-0.99; OR 6.94, 95% CI 1.54-31.30, respectively). However there was no significant difference between the rate of genetic polymorphism of GSTM1, GSTT1, GSTP1, CYP2E1 and CYP1A1 in the two groups.
CONCLUSION
NAT2 genetic polymorphism was higher in pneumoconiosis patients than in normal subjects. The age of onset of the disease and smoking were significantly related with pneumoconiosis. However, the genetic polymorphism of GSTM1, GSTT1, GSTP1, CYP2E1 and CYP1A1 was not related with development or severity of pneumoconiosis.

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Validity of the Energy Expenditure Prediction Program to Evaluate Energy Expenditure During Work: Dong Mug Kang, Ji Hoon Woo, Jin Sook Jun, Yong Hwan Lee, Byung Mann Cho, Su Ill Lee; Korean Journal of Occupational and Environmental Medicine 2004;16(3):303-315. Published online September 30, 2004; DOI: https://doi.org/10.35371/kjoem.2004.16.3.303

Abstract PDF

OBJECTIVES
The Energy Expenditure Prediction ProgramTM (EEPP) has been considered as a simple and quantitative method to evaluate physical work load. However, the adoption of EEPP directly to Korean workers is problematic because it was developed in a laboratory setting for Caucasians. Therefore, this study was conducted to validate EEPP for Korean workers.
METHODS
The study subjects consisted of 60 workers from two factories. Cycle ergometer test was conducted to calculate physical work capacity, and heart rate monitoring was conducted to check heart rate during work. After observing the task, energy expenditure was estimated by EEPP.
RESULTS
EEPP underestimated energy expenditure less than EEHR (energy expenditure checked by heart rate) did(p<0.0001). The factors effecting EEHR were EEPP and task type. After dividing the task into regular and irregular tasks, the irregular task had a larger difference between the values from the two methods. We provided task specific regression models between EEHR and EEPP.
CONCLUSIONS
Because EEPP underestimated energy expenditure, it needs to be adjusted before use with Korean workers. It is suggested that different adjusting equations are formulated for regular and irregular tasks. Further study to develop a specific energy estimation model appropriate for Koreans is needed to obtain more precise estimation.

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Estimation Model of Energy Expenditure of Working in a Clean Room for Manufacturing Embedded Needles by Ergonomic Programs
Tae-Eun Chung
Transactions of the Society of CAD/CAM Engineers.2016; 21(1): 69. CrossRef

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Work Related Factors Affecting Perceived Fatigue in Male Metal Assemblers: Jun Ho Jang, Dongmug Kang, Sang Baek Koh, Jungwon Kim, Byung Mann Cho, Su Ill Lee; Korean Journal of Occupational and Environmental Medicine 2004;16(2):155-165. Published online June 30, 2004; DOI: https://doi.org/10.35371/kjoem.2004.16.2.155

Abstract PDF

OBJECTIVES
To find work related factors affecting perceived fatigue among male metal product assemblers.
METHODS
The study subjects were metal product assemblers from three metal product companies (476 car parts assemblers, 610 car engine assemblers, 454 ship engine assemblers). From the total of 1,540 subjects, 1,136 (73.8%) were included and 38 respondents with insufficient replies were excluded. Associations between fatigue score and other variables (general characteristics, job related factors, workload, job stresses) were investigated in terms of the concept of multidimensional fatigue construct by self administered questionnaire. Using MFS (Multidimensional Fatigue Scale), JCQ (Job Content Questionnaire), and Borg's scale, we estimated the fatigue, job stress, and workload, respectively. Fatigue score was estimated by 'sum of fatigue' in MFS. Associations were tested by linear regression analysis using SAS v.8.0.
RESULTS
In this study, the fatigue related factors were older age, longer working hours per week, higher workload, higher job demand, lower decision latitude, and lower supervisor support.
CONCLUSIONS
Prolonged working hours, higher workload, higher job demand, poor supervisor support and lower decision latitude were fatigue related factors among the male metal product assemblers of this study.

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The Effects of Job Characteristics on Smoking and Mediating Effects of Job Stress among Older Workers
Sungeun Lee
Korean Journal of Health Education and Promotion.2014; 31(3): 51. CrossRef
The Influence of occupational stress on dry mouth, temporomandibular disorder and oral symptoms on workers
Min-Hee Hong
Journal of Korean society of Dental Hygiene.2013; 13(1): 136. CrossRef
Relations between Fatigue and Work-related Factors in Workers
Eun Sook Jung, Nam Hyun Cha
Journal of Korean Academy of Community Health Nursing.2011; 22(4): 420. CrossRef
Effects of Fatigue on Health Promotion Behavior and Mental Health of Automotive Manufacturing Workers
Kyung-Hee Lee, Kyung-Sook Lee
Korean Journal of Occupational Health Nursing.2011; 20(2): 143. CrossRef

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Effects of Physical Workload on Salivary Cortisol Level: Dong Mug Kang, Byung Min Son, Sang Baek Koh, Junho Jang, Mia Son, Jongwon Kim, Byung Mann Cho, Su Ill Lee; Korean Journal of Occupational and Environmental Medicine 2004;16(1):57-69. Published online March 31, 2004; DOI: https://doi.org/10.35371/kjoem.2004.16.1.57

Abstract PDF

OBJECTIVE: Workload is known to affect the hypothalamus-pituitary-adrenal axis. Although many studies had revealed that job stress related factors could affect the neuroendocrine system among blue-collar workers, these studies had limitations as they had not evaluated the workload by objective methods which took into consideration individual physiological differences. This study was conducted to evaluate the effects of physical workload adjusted job stress on cortisol regulation by using objective tools for workers having various job tasks.
METHODS
Among 110 foundry workers, shipyard workers, and fine machine assemblers for whom saliva samples were obtained, 102 without any past history of conditions that could affect hormonal regulation such as diabetes, and hypertension were included in this study. Among the 102 study participants, 15 workers whose saliva for morning or afternoon or heart rate monitoring data was not attained were excluded from the final analysis. Workload was evaluated by RHR (relative heart rate) using a heart rate monitor, and job stress was evaluated by Karasek's Job Content Questionnaire. Saliva samples were gathered during 8 - 9 am and 5 - 6 pm, and salivary cortisol levels were analysed by radioimmunoassay.
RESULTS
After adjusting several variables which could effect cortisol secretion including job stress, among the higher RHR group morning salivary cortisol level was increased (beta=60.32, S.E.=26.35, p=0.0266), afternoon salivary cortisol level was decreased (beta=-7.43, S.E.=29.73, p=0.8044), and salivary cortisol level difference between morning and afternoon was increased (beta=72.10, SE=35.50, p=0.0509).
CONCLUSIONS
As physical workload increases morning cortisol level, which is caused by the effect of arousal, and decreases afternoon cortisol level, which is caused by exhaustion, physical workload enlarges the width of diurnal cortisol variance. Therefore, physical exhaustion due to excessive workload could have adverse effects on the neuroendocrine system.

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A Review on the Job Stress Measurements in Nuclear Power Plant Workers for Human Error Prevention
Seon Soo Kim, Meiling Luo, Yeon Ju Oh, Yong Hee Lee
Journal of the Ergonomics Society of Korea.2013; 32(1): 47. CrossRef
Determination of Appropriate Sampling Time for Job Stress Assessment: the Salivary Chromogranin A and Cortisol in Adult Females
Ran-Hi Hong, Yun-Jung Yang, Sang-Yon Kim, Won-Young Lee, Yeon-Pyo Hong
Journal of Preventive Medicine and Public Health.2009; 42(4): 231. CrossRef
Distribution and determinants of maximal physical work capacity of Korean male metal workers
D. Kang, J.-H. Woo, Y.-C. Shin
Ergonomics.2007; 50(12): 2137. CrossRef

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A Study on Karoshi to Make Application for Industrial Accident Compensation in Busan: Yeon Nam, Cha Jae O, Jung Rae Park, Dong Jun Lee, Byung Mann Cho, Su Ill Lee; Korean Journal of Occupational and Environmental Medicine 2002;14(1):34-46. Published online March 31, 2002; DOI: https://doi.org/10.35371/kjoem.2002.14.1.34

Abstract PDF

OBJECTIVES
Karoshi is a word meaning death from work-overload. Work-related diseases due to continuous overwork are primarily cerebro- and cardio-vascular in nature. In Korea, despite an increase in the incidence of Karoshi, it is not easy to recognise by workmen's compensation in Korea. This study intended to establish basic information concerning the incidence of Karoshi.
METHODS
219 cases were collected based on workers' compensation records of three Busan Regional Centers of Labor Welfare Corporation from 1991 to 1999. The size of workplace, occupation, daily working time, type of working schedule, job tenures, characters of work-overload and duration of work-overload were investigated according of subgroups of general characteristics. Both univariate and multiple logistic regression analyses were used to estimate the relationship between risk factors and a recognition of Karoshi.
RESULTS
1. 61.6 % of total cases were recognized as Karoshi. 30.6 % occurred in a small workplace of less than 50 workers, 34.7 % were drivers or guards, and 48.8 % were more than 50 years old. Additionally, 29.6 % worked more than 12 hours, 37.5 % were irregular hours and shift workers and 21.5 % of the total had been on the job less than 6 months. 2. Of the causes of death, 49.8 % was cerebro-vascular diseases and it was more than cardio-vascular ones. And 80.4 % of total cases was belonged to the recognition-category of the Labour Ministry's Law. The previous disease history was found on 49.8 % of all cases. Of them, hypertension was most common as 21.9 %. 3. 53.9 % of patients were exposed to job hazards such as driving, monitoring, guarding, risky jobs and frequent long-term official trips. 64.7 % recorded a increased work-overload of job contents and working hours. Of the several types of work-overload, 42.5 % displayed long-term physical and psychotic work-overload and 22.2 % exhibited job characteristic work-overload. 4. In this study, work-overload was associated with the incidence of Karoshi in 76.3 % of cases. This rate was higher than the recognition of Workmen's compensation recorded by the Korea Labor Welfare Corporation. Of these, 43.6 % belonged to sufficient factors, 10.4 % partial factors, and 22.3 % were due to aggravating factors. 5. Logistic regression demonstrated that death due to cerebro- and cardio-vascular disease, shorttenure within 6 month was significantly associated with a recognition of Karoshi (p=0.034, OR=3.00, C I = 1 . 0 9~8.30/p=0.016, OR=6.76, CI=1.43~32.07 respectively) and that an increase of work-overload was also associated, but its statistical significance was slightly lower(p=0.081, OR=2.02, CI=0.91.~4.46 ) . However, no association was found between this recognition and overtime work, hazardous job, irregular work schedule, low-income, injury-onset place, or small size of workplace. The elderly group(>50years old) and those with a previous disease history were negatively associated with recognition although the statistical association was low.
CONCLUSIONS
Karoshi in Busan occurred frequently in a small workplace of less than 50 workers, especially drivers or guards. Additionally, these cases worked more than 12 hours, were irregular hours and shift workers. The death due to cerebro- and cardio-vascular disease, short-tenure within 6 month was significantly associated with a recognition of Karoshi. However Karoshi in this study occurred frequently in overtime work and high risk groups of work-overload. Therefore, for prevention of Karoshi, work-overload and overtime work need improved and controled.

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Work-related Cerebro-Cardiovascular Diseases in Korea
Dae-Seong Kim, Seong-Kyu Kang
Journal of Korean Medical Science.2010; 25(Suppl): S105. CrossRef
Factors Affecting the Designation of Cerebrovascular Diseases as Work-Related in Administrative Litigation
Hyeongsu Kim, Jaewook Choi, Hwayoung Rim, Sounghoon Chang, Kunsei Lee
Journal of Korean Medical Science.2008; 23(2): 236. CrossRef

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Utility of a Self-administered Hand Symptom Diagram for the Diagnosis of Carpal Tunnel Syndrome: Cha Jae O, Byung Mann Cho; Korean Journal of Occupational and Environmental Medicine 2001;13(4):360-368. Published online December 31, 2001; DOI: https://doi.org/10.35371/kjoem.2001.13.4.360

Abstract PDF: OBJECTIVES
This study was conducted to compare a self-administered hand symptom diagram with other diagnostic tests and to assess its value in the diagnosis of carpal tunnel syndrome.
METHODS
A self-administered hand symptom diagram has been developed for the evaluation of upper extremity paresthesias. A rating system was devised to classify the diagrams into four categories: classic, probable, possible, or unlikely carpal tunnel syndrome. Before nerve conduction testing, a medical history and demographic data were collected, a physical examination was conducted, and a hand symptom diagram was obtained from each patient. The diagram ratings of 85 patients(130 hands) were evaluated by an occupational and environmental medicine physician and a nerve conduction study was administered and interpreted by a rehabilitation medicine physician.
RESULTS
Of 85 patients, 48(56.5 %) had carpal tunnel syndrome confirmed by nerve conduction study. A hand symptom diagram rating of classic or probable CTS had a sensitivity of 75.6 %, a specificity of 59.6 %, a positive predictive value of 73.8 % and a negative predictive value of 62.0 %. Of the combinations of clinical findings in carpal tunnel syndrome, a classic or probable hand symptom diagram or a positive Tinel's sign showed the highest sensitivity.
CONCLUSIONS
A self-administered hand symptom diagram is valuable in the diagnosis of carpal tunnel syndrome among patients with upper extremity paresthesias. It is a useful diagnostic tool and may be valuable for occupational or population screening.

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The Serum Copper and Zinc Concentration according to the Progression of Pneumoconiosis: Jung Rae Park, Jong Wook Park, Su Ill Lee, Cheol Ho Yi, Cha Jae O, Chang Won Kim, Byung Mann Cho, Don Kyoun Kim; Korean Journal of Occupational and Environmental Medicine 2000;12(3):384-394. Published online September 30, 2000; DOI: https://doi.org/10.35371/kjoem.2000.12.3.384

Abstract PDF: OBJECTIVES
Copper and Zinc, the trace elements of a living body, take a part in immunologic mechanism and induce the pulmonary fibrosis which is the pathologic progress of pneumoconiosis. This study was performed to assist the identification of the pathologic process of pulmonary fibrosis in pneumoconiosis.
METHODS
The subjects of this study was 200 diagnosed persons as pneumoconiosis, of whom 100 persons was the visitors in the outpatients departments of pneumoconiosis and 100 admissive pneumoconiosis patients. The serum copper and zinc are measured and com pared.
RESULTS
The mean serum copper concentration of visitor group was significantly higher than that of control group, and that of stage V3 subgroup of visitor group was highest because of their advanced fibrosis. But, there was not the difference of serum copper concentration between patient and control group. We thought that the reason was poor nutritional and health status of the patient. The mean of serum zinc concentration of visitor and patient control was lower than that of control group. As the degree of pulmonary fibrosis was more severe from stage Vl, V2, V3 of visitor to stage Pl, P2, P3 of patient, the mean of serum zinc concentration was lower. The ratio of serum copper/zinc of visitor and patient was higher than that of control, and that of patient was higher than that of visitor. Those results showed that the ratio of serum copper/zinc ratio more greatly expressed the degree of progression of pneumoconiosis than only copper or zinc concentration by adjustment of nutritional and health status of the patient.
CONCLUSIONS
As above study results, the degree of pulmonary fibrosis of pneumoconiosis could be estimated by means of serum copper/zinc ratio.

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The Effect of Noise Exposure and Age on the Changes of Group Mean Hearing Threshold Level: Annual Follow-up Studies for Seven Years: Ji Ho Lee, Choong Ryeol Lee, Cheol In Yoo, Seung Rim Yaang, Ok Hyun Kim, Byung Mann Cho, Su Ill Lee, Don Kyoun Kim; Korean Journal of Occupational and Environmental Medicine 1999;11(2):137-152. Published online June 30, 1999; DOI: https://doi.org/10.35371/kjoem.1999.11.2.137

Abstract PDF

This study was carried out to evaluate the effect of noise exposure and age on the changes of group mean hearing threshold level(HTL) over 7-year period. For this purpose, consecutive annual audiometric tests were performed from 1991 to 1997. among 718 male employees of a metal product manufacturing factory. The subjects were divided four groups as follows according to noise level category(NLC). NLC-I officer, exposed noise level was under 60 dB(A) of time weighted average(TWA) NLC-JI technical assistant or engineer, they exposed to workplace noise occasionally NLC-IJJ worker, exposed noise level was below 85 dB(A) of TWA. wore hearing protection device(earmuff or earplug) NLC-IV worker, exposed noise level was over 85 dB(A) of TWA, wore hearing protection device(earmuff and earplug). The results were as follows 1. The improvement of group mean HTL was continued until the fifth year, showing the peak at the third year. The magnitudes of this learning effect were 1.5 - 4.6 dB. 2. The mean HTL of each age group tended to increase after the third year and the tendency was more prominent at 4000 Hz. 3. In noise exposed group(NLC-II, III, and IV), mean HTL increased from the third year after decreasing, meanwhile, in noise free group(NLC-I). it was few changed for the entire period. Among the noise exposure group, the mean HTL of NLC-IV was lower than that of NLC-III and NLC-IV. 4. After learning effect, the mean increase of HTL in noise free group(NLC-I) was 0.4-1.7 dB that suggests aging effect, and that in noise exposure group(NLC-ll, III, and IV) was 0.9 -4.1 dB that suggests noise effect. 5. Statistical analysis of the general linear model implicated that the effect of age was statistically significant at 500, 3000, 4000 and 6000Hz. and the effect of noise exposure was statistically significant at all frequencies except 6000Hz. However, the age * noise interaction was not significant at all frequencies. From these results, it was concluded that the effect of age and noise exposure seems to affect the mean HTL independently and these two factors contribute to an additive effect for the mean HTL change. Furthermore, more concerns should be needed for hearing conservation of low level exposures without any specific protection.

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For 5-years the Longitudinal Study on the Effect of Noise Exposure and Aging to the Changes of Hearing Threshold Level
Chang Ho Chae, Ja Hyun Kim, Jun Seok Son
Journal of Korean Society of Occupational and Environmental Hygiene.2015; 25(4): 573. CrossRef
Prevalence and Risk Factors of Hearing Loss Using the Korean Working Conditions Survey
Kyoo Sang Kim, Oh Jun Kwon
Korean Journal of Audiology.2012; 16(2): 54. CrossRef
Cohort study for the effect of chronic noise exposure on blood pressure among male workers in Busan, Korea
Ji Ho Lee, Weechang Kang, Seung Rim Yaang, Nari Choy, Choong Ryeol Lee
American Journal of Industrial Medicine.2009; 52(6): 509. CrossRef

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A Study on Possibility of Special Health Examination to the Hospital Employees: Su Ill Lee, Byung Mann Cho, Bong Soo Cho, Young Wook Kirn, Kwang Wook Koh, Nam Chool Moon, Joo Won Kirn; Korean Journal of Occupational and Environmental Medicine 1996;8(2):191-200. Published online September 30, 1996; DOI: https://doi.org/10.35371/kjoem.1996.8.2.191

Abstract PDF: This study was performed to decide the possibility of special health examination to the hospital employees. We carried out questionnaire survey for 830 subjects at 2 general hospitals located in Pusan city. The summary of this study are as follows. 1. Above 10% of total hospital employees were replied that they exposed to 16 hazard items, such as dust, noise, stress and etc. Among them, over 50% of hospital employees exposed to dust(69.8%), noise(52.3%), stress(60.1%). And hospital employees exposed to alcoholic disinfectant(41.3%), radiation(34.6%), drug(33.3%), VDT(25.2%), and aldehyde(18.7%) also. 2. 63% of the hospital employees replied that there were hazardous factors in hospital environments, and 80% insisted the necessity for hospital environment measuring. 35.7% of respondents replied that they had never taken the education about hazardous factors. 35.7% of the total respondents answered that they didn't use protective equipment when exposed to hazardous factors. And 48.6% answered they took periodic health examination. Only 7.2% replied that ventilation condition of office room was proper. As shown in above results, hospital employees are exposed to various hazards, and turn out neglecting to health problems caused these hazardous factors. So at first, it is necessary to measuring hospital working environment, and then will be decided the possibility of special health examination to the hospital employees.

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A Study of the Utility of Mahalanobis Distance for Decision of the Results of Health Examination: Byung Mann Cho, Don Kyoun Kim; Korean Journal of Occupational and Environmental Medicine 1994;6(2):270-275. Published online September 30, 1994; DOI: https://doi.org/10.35371/kjoem.1994.6.2.270

Abstract PDF: In the field of industrial health, it is important to establish the efficient system for health management of workers. The management of health information of workers using data base will contribute to such a system. In this context, the utility of method using Mahalanobis distance(D(2)), the general probability distance in multivariate analysis, for decision of the results of health examination was evaluated. Six items of test among the health examination data of 278 prospective employee was used to calculate D(2). Sensitively and specificity of decision method using D(2) with 99% normal range was 95.8% and 90.2% respectively as compared with decision by doctor. This finding suggests the utility of method using D2 for decision of the results of mass screening for industrial workers.

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The Changes of Hearing Threshold Level in Noise-exposed Workers: Byung Mann Cho, Jong Ook Park; Korean Journal of Occupational and Environmental Medicine 1994;6(1):32-41. Published online February 28, 1994; DOI: https://doi.org/10.35371/kjoem.1994.6.1.32

Abstract PDF

Using audiometric test data, noise exposed workers were followed up to assess the activities for hearing conservation from 1989 to 1992. The subjects of study were 71 workers who could be followed up at least two years during this follow-up period. In all subjects, increasing trend of hearing threshold levels (HTLs) was observed after three years of follow-up at all testing frequencies in audiometry and this increase was statistically significant at 8KHz(p<0.05). Also, HTLs increased significantly(p<0.05) in the workers who complained tinnitus(at 0.25, 8KHz), who ws below 90 dB (at 8KHz). Effectiveness of the activities for hearing conservation, assessed by sequential test-retest comparisons, was lower in the workers who complained tinnitus, who had past history of ear disease, and whose workplace noise level was below 90 dB. These findings suggest that the activities for hearing conservation at workplace may have been unsatisfactory until now and more stringent measures may be necessary, especially in the workers who complain tinnitus, who have past history of ear disease, and whose workplace noise level is below 90dB.

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For 5-years the Longitudinal Study on the Effect of Noise Exposure and Aging to the Changes of Hearing Threshold Level
Chang Ho Chae, Ja Hyun Kim, Jun Seok Son
Journal of Korean Society of Occupational and Environmental Hygiene.2015; 25(4): 573. CrossRef

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Alterations of immune response in workers occupationally exposed tolead: Cheol In Ryu, Byung Mann Cho, Ji Ho Lee, In Kyung Hwang, Su Il Lee, Don Kyoun Kim; Korean Journal of Occupational and Environmental Medicine 1991;3(2):135-144. Published online November 30, 1991; DOI: https://doi.org/10.35371/kjoem.1991.3.2.135

Abstract PDF: No abstract available.

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