• Microbiology and Biotechnology Letters
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• v.33 no.1
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• pp.56-64
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• 2005

The occurrence and abundance of protozoa at advanced wastewater treatment plant were compared with operating parameters and effluent quality using statistical procedures. It seemed that plant operating conditions influenced the distribution of protozoa in the mixed liquor. In statistical analysis, the distribution of protozoa showed the operating condition of plant and predicted effluent quality. Once enough data concerning protozoa, operating parameters and effluent has been gathered, the operator has a valuable tool for predicting plant performance and near-future effluent quality based on microscopic examination. Plant operator manipulates operating conditions if he knows near-future effluent quality is deteriorating. Perhaps more importantly it can be used to actually control the plant to adjust the operating conditions to obtain the protozoal populations that have been shown to provide the best effluent quality.

• Korean Journal of Occupational Health Nursing
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• v.15 no.1
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• pp.30-39
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• 2006

Purpose: The purpose of this study was to examine factors influencing for the compliance of guidelines of preventing bloodborne infection for operating room nurses. Method: Data was collected through questionnaires from March 16 to April 12, 2005. The subjects of this study were consisted of 208 operating room nurses, who had been working at 4 university hospitals and 10 general hospitals in Busan. The Instrument for the compliance of guidelines for preventing bloodborne infection was 24-item questionnaire. It was revised based on the Standard Precaution of CDC and Bloodborne Pathogen Standards of OSHA. In addition, to find out the knowledge level of AIDS, hepatitis B and hepatitis C, 15-item questionnaire was used, which had been made by researcher based on Kim(1999) et, al. Results: The affecting factors of compliance for preventing bloodborne infection were work skill(${\beta}=.27$), operating room education on infection prevention(${\beta}=.25$), knowledge on infection(${\beta}=.19$), readiness of using personal protective equipment(${\beta}=.18$), and posting a notice of infected surgery patients(${\beta}=.16$). Theses 5 factors account for 28.5% on the compliance of guidelines for preventing bloodborne infection for operating room nurses. Conclusion: According to the results, to increase the compliance level of operating room nurses, personal efforts should be made to improve work skills and infection knowledge. In addition to organizational efforts on practical education and management of environment were required.

• Journal of Society of Preventive Korean Medicine
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• v.18 no.1
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• pp.43-52
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• 2014

This study was conducted to analyze if there is a difference between the head hospital and branch hospital by comparing the profitability and operating expenses to patient revenue of oriental medicine hospitals affiliated with universities in order to find whether opening branch hospitals is an appropriate method to increase profitability. Profit indices used for the comparison of head hospital and branch hospital include ratio of operating profit on medical revenue, net-income on medical revenue, net profit to total assets, and operating profit to total assets; and cost indices included ratio of labor costs, material costs and administrative costs. In comparison of profit indices of head hospitals and branch hospitals, head hospitals displayed negative(-) in all four profit index averages while branch hospitals displayed positive(+), showing that branch hospitals have higher profitability. In particular, in the case of head hospitals, ratio of net profit to total assets was -13.6%, while that of branch hospitals was 12.9%, which was higher than 3.1%, the average of Korean oriental medicine hospitals in 2011. As a result of difference analysis between groups of head hospitals and branch hospitals, profit indices of ratio of operating profit on medical revenue, net-income on medical revenue, and ratio of net profit to total assets were found to vary by hospitals, but there was no statistically significant difference between head hospitals and branch hospitals(p<0.1). Only the ratio of operating profit to total assets of head hospitals and branch hospitals indicated significant difference between the two groups, showing that ratio of operating profit to total assets of branch hospitals is larger than that of head hospitals. Meanwhile, the cost indices of ratio of labor costs, material costs and administrative costs in the difference test results did not show significant difference between the head hospital and branch hospital(p<0.1). Thus, it cannot be said that a certain oriental medicine hospital's profitability is high or low depending on whether it is head hospital or a branch as profitability varies depending on the management environment of the hospital. Therefore, oriental medicine hospitals affiliated with universities would need to make efforts to increase their profitability as an individual hospital rather than focusing on whether they are head hospital or a branch.

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.29 no.1
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• pp.50-56
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• 2019

Objective: The aim of this study is to analyze the reliability assessment of work environment measurement, and to propose ways of improving the system. Methods: We have reviewed reports and articles on the reliability assessment written by KOSHA and academia in order to analyze problems related with the system and propose the alternatives. Results: There are three ways to improve the system of the reliability assessment. First of all, it is necessary to perform the reliability assessment by measuring the work environment when workers raise questions about the results so we can make workers trust these results of the reliability assessment. Secondly, we should inspect the workplace at first, not the work environment service provider, so we can increase the employer's recognition of his duty to practice the work environment measurement. Thirdly, the technical committee is needed for technical issues related with the work environment measurement. Conclusions: Above all, it is crucial to get the workers' interest and trust to improve the work environment measurement. The reliability assessment should support the meaning and value of the work environment measurement by practicing the reliability assessment whenever workers have a demand for this and operating the technical committee.

• Proceedings of KOSOMES biannual meeting
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• 2018.06a
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• pp.128-128
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• 2018

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2008.10a
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• pp.535-537
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• 2008

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2008.10a
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• pp.469-470
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• 2008

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2010.04a
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• pp.436-437
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• 2010

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2009.10a
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• pp.601-603
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• 2009

• Proceedings of the IEEK Conference
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• 1999.06a
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• pp.683-686
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• 1999

In this paper, we develop an active sonar signal synthesis model to analyze the detection performance of active sonar systems in a shallow water environment. Using this model, we synthesize the return signal of a bistatic sonar system at a typical operating frequency. This signal can be used to test proper active sonar signal processing techniques for real applications.