• 한국환경과학회지
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• 제17권11호
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• pp.1235-1241
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• 2008

Membrane separation is extensively used for water/wastewater treatment because of its efficiency separation processes. However, particles in the feed water can deposit and accumulate on the membrane surface to created cake layer. As a consequence, the selectivity of the membrane and flux through the membrane are decreased, which is called fouling/blocking phenomenon. In order to solve fouling problem, we developed a novel membrane named Carbon Whisker Membrane (CWM) which contains vapor-grown carbon fibers/whiskers on the surface of the membrane and a layer of carbon film coated on the ceramic substrate. We firstly employed polymethyl methacrylate (PMMA) as a testing material to investigate the fouling mechanism. The results suggested that Carbon Whiskers on the surface of the membrane can prevent the directly contact between the membrane body and particles so that the fouling/blocking could not occurred easily compared to the membrane without carbon whiskers. We also researched the relationship with the diameter, density of carbon whisker on the membrane surface and total flux of solutions. Finally, we will be able to control the diameter and density of carbon whiskers on the membrane and existence of carbon whiskers on the membrane, it is important factor, might be prevent fouling/blocking in the water treatment.

• 대한예방한의학회지
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• 제3권1호
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• pp.35-54
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• 1999

This thesis shows about the meaning of treatment rate increasing, the current treated level and the reason of low treatment rate and increasing methods. 1. Treatment rate incresing means high treat level within short time, keeping treatment effect for a long time as well as raising treatment rate. 2. The current by diseases each others completed treatment rate of oriental medicine is 14.0% to 89.7%$(mean:\;{\pm}40.0%)$. Therefore the rate is show too low. 3. The reasons of low treatment rate; low academic level of oriental, academic limitation, clinic and prevention problem of oriental medicine, lack of medical approch suitable for current diseases and symptoms, mostly incurrable diseases using oriental medicine, lack of preventive education, disappropriate medical service and nonspecialty of the treatment, etc. 4. The next methods for incresing the treatment rate must be improved; such as accurate establishment of process that diagnosis symptoms and treats them, system research of microdiagnosis, positive treatment with medicine and nonmedicine method at the same time, appropriate subdivision and actualization of clinical basic research, research of dose and response, diversity of treatment methods and forms, development of treatment service and prevention based on health level, enormous change as cure medicine and opening-up of new disease field, specialization of medical examination, reinforcement of public medical part and herbal drugs use with same origin, mental and pysical stability of patients, accurate extract and oral drinking ways, etc.

• Advances in environmental research
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• 제7권1호
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• pp.53-71
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• 2018

Waste glass disposal causes environmental problems in the cities. To find a suitable green environmental solution for this problem low cost adsorbent in this study was prepared from waste glass. An effective new green adsorbent was synthesized by hydrothermal treatment of waste glass (WG), followed by acidic activation of its surface by HCl (WGP). The prepared adsorbent was characterized by scanning electron microscopy (SEM), X-ray fluorescence (XRF), X-ray diffraction (XRD), and BET surface measurement. The developed adsorbent was used for the removal of heavy metals (Cd, Cu, Fe, Pb and Zn) from well water. Batch experiments were conducted to test the ability of the prepared adsorbent for the removal of Cd, Cu, Fe, Pb and Zn from well water. The experiments of the heavy metals adsorption by adsorbent (WGP) were performed at different metal ion concentrations, solution pH, adsorbent dosage and contact time. The Langmuir and Freundlich adsorption isotherms and kinetic models were used to verify the adsorption performance. The results indicated high removal efficiencies (99-100%) for all the studied heavy metals at pH 7 at constant contact time of 2 h. The data obtained from adsorption isotherms of metal ions at different time fitted well to linear form of the Langmuir sorption equation, and pseudo-second-order kinetic model. Application of the resulted conditions on well water demonstrated that the modified waste glass adsorbent successfully adsorbed heavy metals (Cd, Cu, Fe, Pb and Zn) from well water.

• 한국콘텐츠학회논문지
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• 제14권7호
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• pp.217-225
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• 2014

본 연구는 영구임대아파트 주민의 우울정도에 영향을 미치는 요인을 분석하고자 실시하였다. 연구대상은 G광역시에 소재한 영구임대아파트 주민중 19세 이상 60세 미만 446명을 대상으로 설문조사를 실시하였다. 영구임대아파트 주민들의 74.4%가 우울문제가 있는 것으로 나타났으며, 33.9%정도는 심한 우울을 경험하고 있는 것으로 나타나 영구임대아파트 주민들의 우울문제가 상당히 심각한 것으로 나타났다. 영구임대아파트 주민들의 우울정도에 영향을 미친 변인을 Enter multiple regression analysis를 한 결과 자아존중감, 건강상태, 연령, 삶의 만족도 그리고 문제음주인 것으로 나타나 향후 이들 변인들을 고려해서 우울 예방프로그램을 개발하는 것이 필요한 것으로 나타났다.

• 상하수도학회지
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• 제22권2호
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• pp.267-274
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• 2008

This study is about efficiency of pretreatment process and operating factor to membrane process at continuous coagulation/ultrafiltration process in water treatment. The capacity of pilot plant was $0.06{\beta}(C)/d$. The raw water used was from Nakdong stream which was characteristized by high organic matter and high turbidity. The result of the test was that coagulation is good process as to high removal rate to organic matter and turbidity but It caused problem to membrane pore blocking. This paper is to determine the membrane fouling potential under different membrane flux, backwash pressure and linear velocity. Backwash pressure and flux is important parameter on operation of membrane system. Those are directly affected on membrane system. When backwash pressure increased from 150 kPa to 200 kPa, the result showed that fouling (pressure increase rate) changed from 3.69 kPa/h to 0.93 kPa/h and the recovery rate changed from 90.7 % to 82.0 %. Linear velocity had slightly effect on fouling. Linear velocity increased from 0.2 m/s to 0.5 m/s, the corresponding pressure rate changed from 0.93 kPa/d to 0.77 kPa/d.

• Asian Pacific Journal of Cancer Prevention
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• 제17권9호
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• pp.4185-4197
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• 2016

Chronic arsenicosis is a major environmental health hazard throughout the world, including India. Animals and human beings are affected due to drinking of arsenic contaminated ground water, due to natural mineral deposits, arsenical pesticides or improperly disposed arsenical chemicals. Arsenic causes cancer with production of free radicals and reactive oxygen species (ROS) that are neutralized by an elaborate antioxidant defense system consisting of enzymes and numerous non-enzymatic antioxidants. Dietary antioxidant supplements are useful to counteract the carcinogenesis effects of arsenic. Oyster mushroom lectins can be regarded as ingredients of popular foods with biopharmaceutical properties. A variety of compounds have been isolated from mushrooms, which include polysaccharides and polysaccharopeptides with immune-enhancing effects. Lectins are beneficial in reducing arsenic toxicity due to anticarcinogenetic roles and may have therapeutic application in people suffering from chronic exposure to arsenic from natural sources, a global problem that is especially relevant to millions of people on the Indian subcontinent.

• 보건교육건강증진학회지
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• 제28권5호
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• pp.35-49
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• 2011

Objectives: This article reviewed research on smoking behaviors and smoking-related health problems among university students to suggest evidences for developing smoking control strategies for them. Methods: Domestic research papers were screened through Research Information Sharing Service (RISS), Koreanstudies Information Service System (KISS), Medical Library Information System (MEDLIS), Korean Medical Database (KMbase), and digital national assembly library. International papers were searched mainly via PubMed. Results: Smoking prevalence among male college students were found to be over 50% in majority of Korean studies. While studies on smoking-related health problems were scant in Korea, several recent studies overseas showed possible effects of smoking on health among young adults, including decreased lung function, respiratory symptoms, cardiovascular problems, glucose intolerance, buccal disease, depressive symptoms, and so forth. Besides, smoking behaviors were closely related with other risk behaviors including drinking, and several psychosocial factors. Conclusions: To explore the smoking problem among college students, the first step should be a national representative survey with scientific methods. More research should be focused on the smoking-related problems among college students. To prevent smoking among college students, smoking prevention education, and smoking cessation counseling, and the initiatives of smoke free campus are needed.

• 한국직업건강간호학회지
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• 제8권1호
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• pp.103-108
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• 1999

In order to investigate the basic data for the visiting nursing care plan of Health Center in Korea, the questionnaire survey in regard to health care needs and health problems of the subjects with visiting nursing care was carried out on 131 subjects with visiting nursing care. The results were as follows : 1. The subjects consisted of 38.2% in male and 61.8% in female. 77.1% of the subjects had no job. 2. In the health problem, the subjects symptoms were 31.2% of hypertension, 20.6% of arthritis, and 19.1% of diabetes and other chronical illness. Utilization of medical care facilities were 61.8% of private clinics or general hospitals and 29.0% of Health Center. 3. 10 areas of health care needs that subjects wanted were disease management(19.5%), demand for welfare concerns(15.7%), health promotion and disease prevention(14.2%), information for medical institution(12.3%), health management for the aged(10.8%), hospice care(8.0%), prevention of dementia(8.0%), care for mental hygiene(6.7%), management for drinking, smoking and drug abuse(3.3%), home care nursing and rehabilitation nursing(1.2%).

• 지역사회간호학회지
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• 제22권4호
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• pp.365-376
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• 2011

Purpose: The purpose of this study was to investigate the patterns of smoking relapse and to identify risk factors related to smoking relapse among those successful in smoking cessation at the smoking cessation clinics of public health centers. Methods: Data were collected from 1,705 six-month quitters and analyzed by the Kaplan-Meier analysis and the Cox proportional hazard model. Results: The rate of smoking relapse was 38.2% in 1 year, 44.4% in 2 years, and 47.8% in 5 years. The vast majority of relapse (62.3%) occurred within the first six months after quitting. The risk factors related to smoking relapse were age (HR 1.964: 95% CI 1.545, to 2.497), nicotine dependence (HR 1.293: 95% CI 1.087 to 1.539), problem drinking (HR 1.497: 95% CI 1.116 to 2.008), behavioral therapy type (HR 1.398: 95% CI 1.193 to 1.638), and nicotine replacement therapy type (HR 1.363: 95% CI 1.077 to 1.724). Conclusion: For reducing smoking relapse, it is necessary to develop a smoking relapse prevention program for the first six months after quitting and to strengthen behavioral therapy in the course of smoking cessations clinics.

• 한국유체기계학회 논문집
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• 제20권2호
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• pp.69-74
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• 2017

Sodium hypochlorite, used as water disinfectant, is generated by electrolysis of salt. Compared to chlorine gas disinfection, it is free from high-pressure gas regulation and does not generate toxic gas, so it is increasingly used as a safe disinfectant. Despite these advantages, the concentration of sodium hypochlorite decreases with temperature during long-term storage, and the amount of chlorate increases when a large amount is added, it has mainly been applied to small-scale waterworks. To solve this problem, high sodium hypochlorite generation was developed. In this study, the changes of concentration and chlorate of sodium hypochlorite with time has been studied. As a result of the test, it was found that the usable period of sodium hypochlorite produced at a certain temperature or less was increased from 1.5 days to 13 days. Overall, sodium hypochlorite can be applied even in large-scale waterworks, which makes operation more stable and also reduces the disinfection byproducts, thus it contributed greatly to securing water quality.