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수처리 적용을 위한 PVdF/GO 하이브리드 나노섬유 분리막의 제조
장원기,윤재한,정화경,정건용,변홍식 한국막학회 2015 한국막학회 총회 및 학술발표회 Vol.2015 No.05
본 연구에서는 산화그래핀(GO)을 기질 고분자인 PVdF에 도입하여 전기방사법으로 나노섬유 형태의 분리막을 제조하고, 수처리용 분리막으로의 활용가능성을 조사하였다. 제조된 GO와 나노섬유 분리막은 SEM, TEM, XPS, FT-IR, Raman spectra등을 이용하여 GO의 도입여부 및 화학적 구조를 분석하였으며, 순수투과도 및 제거율, TMP변화를 상용막인 CPVC(chlorinated Polyvinyl chloride) 평막과 비교분석하였다. 또한, 항균성 향상과 중금속 제거를 위해 금속물질과 복합화를 진행하고, 이에 따른 활용가능성을 조사하였다.
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산화철이 기능화된 산화그래핀을 함유한 PAN 나노섬유 복합분리막의 제조 및 수처리용 분리막으로의 활용
장원기,윤재한,변홍식 한국막학회 2014 멤브레인 Vol.24 No.2
본 연구에서는, 산화그래핀(GO) 및 산화철이 기능화된 산화그래핀(M-GO)을 용매인 dimethylformamide (DMF)에초음파분쇄법을 이용하여 완전히 분산시킨 후, 기질고분자인 polyacrylonitrile (PAN)에 첨가하여 전기방사함으로써, 나노섬유 형태의 복합분리막을 제조하였다. 제조된 나노섬유 분리막은 적층수를 변화시켜 기공크기를 조절하였다. Scanning Electron Microscope (SEM) 분석 결과로부터 약 500 nm 크기의 고른 직경분포를 가진 나노섬유 복합분리막이 제조되었음을 확인하였다. 또한, Raman spectroscopy 분석과 Energy Dispersive x-ray Spectroscopy (EDS) 분석 결과로부터 GO 및 M-GO가 분리막 내에 분산되어 있음을 확인하였다. 최종 나노섬유 복합분리막은 상용막(0.27 µm, 55%)과 유사한 기공특성(0.21~0.24 µm,40%)을 보여주었으며, 수투과도 측정결과 PAN 막에 비해 약 200% 향상된 성능을 보여주었다. 이러한 결과로부터, 전기방사법으로 제조된 나노섬유 복합분리막은 수처리용 분리막으로서 충분한 활용가능성이 있다고 판단된다. In this study, the nanofiber composite membrane was prepared by electrospinning method with poly (ancrylonitrile) (PAN) and a dispersed solution of graphene oxide (GO) and Fe3O4 functionalized graphene oxide (M-GO) in dimethyl formamide (DMF). The pore-diameter of prepared membranes was controlled by change of those layers. It was confirmed with SEM that the nanofiber composite membranes having fiber size of 500 nm were prepared. It was found with Raman spectroscopy and EDS that GO and M-GO were well dispersed on those membranes. Final nanofiber composite membrane showed the similar pore properties (0.21~0.24 µm/pore-size, 40% porosity) with the commercial membrane (0.27 µm/pore-size, 55% porosity) and their water-flux results also showed the 200% higher flux than its PAN membrane. From these results, it was expected that the nanofiber composite membrane prepared by electrospinning method could be utilized as a water-treatment membrane.
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Changes in Labor Regulations During Economic Crises: Does Deregulation Favor Health and Safety?
장원기 대한예방의학회 2011 Journal of Preventive Medicine and Public Health Vol.44 No.1
Objectives: The regulatory changes in Korea during the national economic crisis 10 years ago and in the current global recession were analyzed to understand the characteristics of deregulation in labor policies. Methods: Data for this study were derived from the Korean government’s official database for administrative regulations and a government document reporting deregulation. Results: A great deal of business-friendly deregulation took place during both economic crises. Occupational health and safety were the main targets of deregulation in both periods, and the regulation of employment promotion and vocational training was preserved relatively intact. The sector having to do with working conditions and the on-site welfare of workers was also deregulated greatly during the former economic crisis, but not in the current global recession. Conclusions: Among the three main areas of labor policy, occupational health and safety was most vulnerable to the deregulation in economic crisis of Korea. A probable reason for this is that the impact of deregulation on the health and safety of workers would not be immediately disclosed after the policy change.
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장원기,조중구 대한흉부심장혈관외과학회 1999 Journal of Chest Surgery (J Chest Surg) Vol.32 No.11
The pulmonary sarcomatoid carcinoma is a rare malignant tumor, which is composed of an admixture of carcinomatous and sarcomatous components, and accounts for 0.3% of all pulmonary neoplasms. Clinicopathological features are often related to anatomical location: central endobronchial type and peripheral parenchymal type. Noninvasive diagnostic test had a low yield in detection sarcomatoid carcinoma. Metastasis to the regional lymph nodes and to distant organ is common. The prognosis is poor and the median survival is about 15 months. We report two cases of pulmonary sarcomatoid carcinoma with review of literatures.
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임상전문분야별 의사 설문조사를 통한 병원서비스 평가 방법 연구
장원기,문옥륜,Jhang, Won-Gi,Moon, Ok-Ryun 대한예방의학회 1996 Journal of Preventive Medicine and Public Health Vol.29 No.4
A physician survey was done by mailing for the purpose of performing hospital services evaluation and ranking. A slightly over one thousand samples were drawn from the list of professional societies, and 324 physicians(about 32 percent) replied. This study has focused on developing easy and simple method to evaluate hospital services, and providing patients with useful information. Hospital service structure and process were evaluated without outcome evaluation, because it is difficult to obtain reliable data regarding health services outcome indicators. Clinical specialty was targeted to evaluate, and three specialties were chosen, that is obstetrics & gynecology, cardiology, and proctology. Among 16 structural indicators, four indicators were finally chosen in each specialty by respondent specialists. And then using these indicators, structural score was calculated for study hospitals. For process evaluation, physicians were requested to nominate five most famous hospitals. The nomination score and structural score were summed up to produce final score and hospital ranking. This method is very easy to conduct rather than other hospital services evaluation methods prevailing in Korea. And it is more useful for patients to choose hospitals, according to his/her own purpose, because it gives high ranking hospitals with specific clinical specialty.
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우리나라 의료규제의 내용별 유형 분류 : 대규모 규제완화시기의 존속 규제 분석
장원기 한국보건사회학회 2004 보건과 사회과학 Vol.15 No.-
After the foreign currency crisis happened in the end of 1997, Korean government have conducted a massive deregulation in the whole area of the society. This study analysed the surviving regulations in health care area for the purpose of understanding the location and types of the regulations. A great amount of regulations were found through the whole course of the national health care delivery system and health care resource development system: entry, input, production process, output, and exit. The majority of the regulations are quality regulations, and price regulation under the national health insurance system plays an important role as well. Besides, occupational health and safety regulations, regulations for securing the access of health care, and regulations for human right were found including a peculiar case of facility investment limitation for direct control of national health care expenditure. Unlike the regulations in general economic area, price and quality of services and products in health care are regulated massively all over the system, continually increasing the quality of health care and curbing the cost of the national health care system. So, it can be said that, by the regulations, government does not confine its role to compensate market failure, but actively intends to maximize the efficiency of national health care system.
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