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Myung Wha Ha 2 Articles
A Survey of Hepatitis B Virus Markers by EIA Method among Steel Manufacturing Workers
Jung Gu Kirn, Bbk Dong Nam, Sam Deug Bae, Myung Wha Ha, Doo Hie Kim, Seung Won Kang, Jong Young Lee
Korean Journal of Occupational and Environmental Medicine 1996;8(2):249-257.   Published online September 30, 1996
DOI: https://doi.org/10.35371/kjoem.1996.8.2.249
AbstractAbstract PDF
A study for seroprevalence of Hepatitis B virus markers (HBsAg, Anti-HBs, HBeAg and Anti-HBe) by EIA method and the Liver Function Test(SGOT and SGPT) using kinetic method was carried :out from January; to October 1995 :among male workers of a .major iron and steel manufacturing company, located,,in Pohang. The results were as follows; 1. The distribution of hepatitis B virus markers showed that the proportions of HBsAg(+)/Anti-HBs (-), HBsAg(-)/Anti-HBs (+) 'and HBsAg(+)/Anti-HBs (+) were 8.1%, 60.5% and 0.1%, respectively. The positive rate of HBsAg in all subjects was 8.2% whereas that of anti-HBs was 60.6%. 2. The proportions of HBsAg(+)/Anti-HBs (-) and HBsAg(-)/Anti-HBs (+) increased significantly with age. While the distribution of hepatitis B virus markers exhibited no significant differences among the groups classified by educational background or work type. 3. The proportion of drinkers in HBsAg (+)/Anti-HBs (-) (73; 9%) was significantly lower than those of HBsAg (-)/Anti-HBs (-) and HBsAg (-)/Anti-HBs (+) (84.6% and 85.7% respectively). The proportions of smoking for the three groups of HBsAg (-)/Anti-HBs(+),-HBsAg (+)/Anti-HBs (-) and HBsAg (-)/Anti-HBs (-) were 54.3%, 53.7% and 53.0%, respectively (p<0.01). The proportion of the subjects with abnormal liver function test in HBsAg (+)/Anti-HBs (-) was 40.1%, whereas those in HBsAg (-)/Anti-HBs (-) and HBsAg(-)/Anti-HBs (+) were 21.9% and 18.4%, respectively. 4. The distribution of e Ag markers among HBsAg (+) subjects showed that the proportions of HBeAg(+)/Anti-HBe(-), HBeAg(-)/Anti-HBe(+) and HBeAg(+)/Anti-HBe(+) were 31.3%, 55.0% and 1.6%, respectively. The proportion of HBeAg(+)/Anti-HBe(-) decreased significantly with age and those of HBeAg(-)/Anti-HBe(-) and HBeAg(-)/Anti-HBe(+) increased with age. The positive rate of HBeAg among HBsAg (+) subjects was 32.9%. In conclusion, as a screening method, EIA is. recommended to test hepatitis B virus markers, especially when examining Anti-HBs more sensitively. For the workers of the iron and steel manufacturing company studied, liver diseases caused by other than hepatitis B should be given a special care including an education avoiding alcohol drinking.

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Pohang Iron and Steel Company(POSCO) Computerized Occupational Health Surveillance System(PCOHESS)
Myung Wha Ha, Song Kwon Lee, Soo Whan Lee, Doo Hie Kim
Korean Journal of Occupational and Environmental Medicine 1994;6(2):166-174.   Published online September 30, 1994
DOI: https://doi.org/10.35371/kjoem.1994.6.2.166
AbstractAbstract PDF
POSCO Health Care Center has collected health and environmental data using computerized system since 1987. One of the important roles of Industrial Health Care Center is to provide a comprehensive occupational health care, including therapeutic medical care, periodic medical examination and industrial hygiene control for the prevention of work-related illness. To strengthen the functions of an occupational health surveillance system since May, 1992, and it is scheduled to be completed by March, 1994. The modified POSCO Computerized Occupational Health Surveillance System (PCOHESS) contains three major area: health care, environmental monitoring, and personal information. The linkage among three area, lacking in the previous system, was emphasized in PCOHESS. The area of health care assists the management of preplacement examination data as well as the diseased and disabled data, and it will facilitate the preplacement for new employees and will enable an efficient care for the diseased and disabled. Environmental and personal sampling data, and personal information data, such as age, education and jobcode etc, that are linked to each employees, can assist the health care professionals to decide the type and time of medical examination and to periodically supply proper protectors. Data collected from the time of one's employment until his/her retirement can be used for the epidemiologic surveillance which will enable to evaluate the employee's health status related to his/her work environments, and to indentify the places that are necessary to be improved.

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