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기계화학공정을 이용한 Perovskite 구조의 (Pb, La)$TiO_3$ 나노 분말 합성 및 특성
임보라미,양재교,이동석,노태형,서정혜,이연승,김희택,좌용호,Lim, Bo-Ra-Mi,Yang, Jae-Kyo,Lee, Dong-Suk,Noh, Tae-Hyung,Seo, Jung-Hye,Lee, Youn-Seoung,Kim, Hee-Taik,Choa, Yong-Ho 한국결정성장학회 2008 한국결정성장학회지 Vol.18 No.5
기계화학공정(MCP; Mechano Chemical Process)은 원료 분말이 기계적인 에너지로 인해 상 형성이 활성화되기 때문에 기존의 볼밀링을 이용한 고상반응에서 필수적인 높은 온도에서의 하소 공정이 필요하지 않다. 본 연구에서는 고 에너지 MCP 방법을 이용하여 perovskite 구조를 가지는 PLT 나노 분말을 제조하였다. 특히, 일반적으로 출발물질로 염을 이용하는 것과 달리 산화물을 원료 분말로 사용하여 어떠한 열처리 공정 없이 PLT 나노 분말을 합성하였다. 또한 건식으로 밀링을 하여 분말 건조 공정이 필요 없어서 공정이 간단하다. MCP 밀링은 시간 별로 12시간까지 진행하였으며, 제조된 분말의 상 분석과 결정면 분석 결과 3시간 이후에는 perovskite 구조의 순수한 PLT 상을 형성하였다. 또한 마이크로 크기의 원료 분말이 밀링 3시간이 지나자 약 20 nm 크기의 균일한 나노 입자가 생성되었다. Mechano Chemical Process (MCP) skips the calcinations steps at an intermediate temperature that is always required in the conventional solid-state reaction because forming phase from raw powder is activated by mechanical energy. In this study, we prepared (Pb, La)$TiO_3$ nanopowder with perovskite structure by only high energy MCP. Especially, the PLT nanopowder was synthesized without any thermal treatment using oxides, not salts as raw powder. This process is also very simple due to dry milling method, unnecessary to dry of powder. The oxide powder was milled up to 12 hr at intervals of an hour using MCP and the pure PLT phase of perovskite structure was formed after milling time of 3 hr. And the average particle size was 20 nm with narrow distribution after milling time of 3 hr from raw powder of several $\mu m$ with inhomogeneous distribution.
기계화학공정을 이용한 Perovskite 구조의 (Pb, La)TiO₃나노 분말 합성 및 특성
임보라미,양재교,이동석,노태형,서정혜,이연승,김희택,좌용호 한국결정성장학회 2008 한국결정성장학회지 Vol.18 No.5
Mechano Chemical Process (MCP) skips the calcinations steps at an intermediate temperature that is always required in the conventional solid-state reaction because forming phase from raw powder is activated by mechanical energy. In this study,we prepared (Pb, La)TiO₃nanopowder with perovskite structure by only high energy MCP. Especially, the PLT nanopowder was synthesized without any thermal treatment using oxides, not salts as raw powder. This process is also very simple due to dry milling method, unnecessary to dry of powder. The oxide powder was milled up to 12 hr at intervals of an hour using MCP and the pure PLT phase of perovskite structure was formed after milling time of 3 hr. And the average particle size was 20 nm with narrow distribution after milling time of 3 hr from raw powder of several μm with inhomogeneous distribution.
생체분자 분리를 위한 Fe<sub>3</sub>O<sub>4</sub> 나노입자의 표면수식과 분산 안정성 향상
김민정,안국환,임보라미,김희택,좌용호,Kim, Min-Jung,An, Guk-Hwan,Lim, Borami,Kim, Hee-Taik,Choa, Yong-Ho 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.4
The surface of magnetite ($Fe_{3}O_{4}$) nanoparticles prepared by coprecipitation method was modified by carboxylic acid group of poly(3-thiophenacetic acid (3TA)) and meso-2,3-dimercaptosuccinic acid (DMSA). Then the lysozyme protein was immobilized on the carboxylic acid group of the modification of the magnetite nanoparticles. The magnetite nanoparticles are spherical and the particle size is approximately 10 nm. We measured quantitative dispersion state by dispersion stability analyzer for each $Fe_{3}O_{4}$ nanoparticles with and without surface modification. The concentration of lysozyme on the modified magnetite nanoparticles was also investigated by a UV-Vis spectrometer and compared to that of magnetite nanoparticles without surface modification. The functionalized magnetite particles had higher enzymatic capacity and dispersion stability than non-functionalized magnetite nanoparticles.
우리나라 20세 이상 장애인 건강검진 수검률 추이 및 관련 요인분석
윤지은 ( Ji Eun Yun ),임보라미 ( Bo Ra Mi Lim ),호승희 ( Seung Hee Ho ) 한국보건행정학회 2014 보건행정학회지 Vol.24 No.2
Background: People with disabilities have higher prevalence rates and earlier onset of chronic disease than the non-disabled; therefore, their participation in health screening is important. This study evaluates the participation rate and trends in health screening of people with disabilities, and examines the association between their participation rate and disability characteristics, and socioeconomic status. Methods: Data on disability-related characteristics were collected from the National Disability Registry, and participants` corresponding health examination data were taken from the Korean National Health Insurance Corporation between 2002 and 2011. A total of 873,819 participants aged ≥20 years were analyzed in this study. Results: The rate of participation of people with disabilities in health screening has increased each year, but their participation rate is lower than that of the total population. The participation rate was lower in females than in males; the elderly group than in the younger group; those who live in city areas than rural areas; self-employed for health insurance than employees; those with an internal organ disability than those with an external physical disability; those with a severe disability than those with a mild disability; and those with a short-term disability than for those with a long-term disability. Conclusion: The factors associated with participation rate are age, sex, socioeconomic status, and disability characteristics. These findings indicate that health check-ups of people with disabilities should be promoted using an approach that takes into account the large individual differences in socioeconomic status and disability characteristics in this population.
중등도 이상의 암성통증을 호소하는 노인 환자에 대한 고용량의 마약성 진통제의 이용: 전향적 관찰 연구
김정은(Jung Eun Kim),최윤선(Youn Seon Choi),이경희(Kyung Hee Lee),김준석(Jun Suk Kim),고수진(Su Jin Koh),백선경(Sun Kyung Baek),김시영(Si Young Kim),송홍숙(Hong Suk Song),임보라미(Bo Rami Lim) 대한임상노인의학회 2016 대한임상노인의학회지 Vol.17 No.1
Background: Despite the large number of elderly individuals who are dying of cancer in Korea, the quality of pain management remains poor. Thus, in this study, the safety and efficacy of using high-dose opioids to treat has been evaluated pain in elderly patients with cancer. Methods: Data from cancer patients (N=94) aged ≥65 years who were administered high-doses of opioids (≥120 mg/day) were collected at 38 hospitals between February 2009 and March 2010. After 8 weeks, changes in pain severity were examined using a numeric rating scale; in addition, the opioid dosages, quality of life parameters, and opioid-based adverse events were investigated. Results: Ninety-two patients were prescribed opioids at the beginning of the study and followed for 8 weeks. The mean pain intensity changed from 5.61±1.56 at baseline to 4.02±2.17 (P<0.001) after 8 weeks. The mean opioid dosage, expressed as oral morphine equivalents, changed from 178.86±76.88 at baseline to 288.54±389.09 (P=0.0025) after 8 weeks. The quality of life parameters, including daily activities, ambulation, and sleep, improved significantly after 8 weeks (P<0.001). At baseline, 44 patients (47.8%) complained of adverse effects such as constipation, dizziness, and nausea; the frequency of adverse events did not increase after 8 weeks. Conclusion: The use of high-dose opioids for treating cancer pain is safe, effective, and tolerable in elderly patients.