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RISS 인기검색어
- 검색키워드
- 저자 : 李輔泳 (검색결과 636 건)
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이보영,정용,신동천,장재연,조성준 한국물환경학회 1989 한국물환경학회지 Vol.5 No.1
Besides of the legal water quality indices such as pH, NH₃-N, NO₂-N, Coliform groups and etc., the unregulated pollutants which is so called at $quot;microorganic chemicals$quot; or $quot;microorganic pollutants$quot; have been issued as being much increased to use and polluted in drinking water recently. They have been identified as one cause of modern diseases in toxicologically as well as epidemiologically This study was performed to identify the concentration as well as the kind of microorganic pollutants in drinking water and to provide the basic data for health risk assessment. The water samples were collected at three water supply stations for the quality of raw and treated water and six points of tap water in Seoul municipal areas during July and November in 1987. 10 kinds of the volatile organic pollutants such as vinyl chloride, carbon tetrachloride, trihalomethanes (THMs) and etc. were determined by purge trap method using gas chromatography. 19 kinds of polynuclear aromatic hydrocarbons (PAHs) such as benzo (a) pyrene, phenathren and etc. were processed by XAD-2 resin adsorption, liquid-liquid extraction and TLC separation, and determined by gas chromatography. The results of analysis were as follows; 1. THMs in treated and tap water were major pollutants among volatile organic pollutants detected. The highest concentration of chloroform was 13.45 ㎍/ℓ in tap water. 2. Carbon tetrachloride, vinyl chloride, 1,1-dichloroethane, 1,2-dichloroethane, trichloroethene, tetrachloroethene, benzene were not detected. 3. The total mean concentrations of PAHs were 188.93 ng/ℓ, 177.6 ng/ℓ, 148.12 ng/ℓ in the raw, treated and tap water, respectively. 4. The mean concentrations of phenathren were 77.49 ng/ℓ of the raw water, 55.08 ng/ℓ of the treated water and 46.32 ng/ℓ of the tap water, respectively. Phenanthren was polluted in the highest level of PAHs in the water samples. 5. Benzo (a) pyrene detected in tap water was the mean concentration 5.7 ng/ℓ which, less than WHO drinking water quality standards, 10 ng/ℓ. 6. The halogenated pesticide was as low as below the range of dection in the gas chromatography. With the above results, as microorganic chemicals being polluted, drinking water quality should be evaluated on the hazard and the risk. According to the risk assessment of benzo (a) pyrene and chloroform, the Seoulian drinking the water analyzed would be exposured to the risk occurrence about 200 additional case of cancer in a population of 10 million in a life time. Futher more researches of micro organic pollutants should be needed in the individual and population risk as well as be regulated legally.
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李輔泳 광주보건대학 1986 論文集 Vol.11 No.-
As modern business management covers a wide range both in quality and in quantity, the function of public administrative management is being expanded and strengthened. The competent democratic leadership is needed to get the democratic and efficient business management. There are two main sections in management. One is the system-inhuman section, the other is the personality-human section. As stated by Pullman, Leadership can harmonize the two sections and achieve managerial aims. Especially, Korea, which is speeding up its modernization, requires, above all efficient and democratic leadership in administrative management, which is the main factor in modernizing our country. The present age is called the age of management. In Korea there is a growing tendency toward the bringing up of able managers. It is not long since the study of management was introduced into Korea, but there are many people who are eager for the Knowledge. The system of management has been shifting to the human relation management since Taylor's Scientific Management. Great emphasis is laid on business management today. The function and natural disposition of managers, therefore, are the kernel for the problem solving. Managers must show a better leadership. The importance of leadershap is accepted in every field and success of an enterprise depends upon the exercise of its leadership. Different types of leadership are classified by different scholars. The most typical ones are those of Lewin's. They are dictatorship type, democratic type, laissez-faire. The most desirable leadership is of course the democratic type. It does not follow, however, that the democratic type ledership is available in any enterprise under any situation. Those three types of leadership are to be made efficient use of according to the circumstances. In conclusion, where the conception that the kernel of leadership is "authority is service" natures, there will exist perfect group which is formed of itself originally, and cooperation of the individuals will be made possible in the group organization.
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