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폴리카보네이트의 용매 유도 결정화에 미치는 용해도 파라미터의 영향 분석
신용현(Yong Hyun Shin),조재영(Jae Young Jho),양태욱(Tae Wook Yang) 한국고분자학회 2021 폴리머 Vol.45 No.3
폴리카보네이트(PC)의 고상중합법은 기존의 중합법들의 문제를 개선하는 좋은 방법이지만, PC 프리폴리머를 결정화하는 전처리 과정을 필요로 한다. 전처리 과정에서는 용매 유도 결정화법이 주로 사용되고 있다. 본 연구에서는 다양한 용매를 이용하여 결정화한 PC의 결정화도를 DSC를 이용하여 측정하였고, Hansen 용해도 파라미터 거리(Ra)와 상호작용 파라미터(χ)를 이용하여 연관관계를 분석하였다. 또한 SEM을 이용하여 결정의 형태와 결정영역의 두께를 관찰하였다. Solid-state polymerization of polycarbonate (PC) is a good way to improve the problems of existing polymerization methods. However, it requires the crystallization of PC pre-polymer as a pre-treatment step, and solvent-induced crystallization is mainly used in the pre-treatment process. In this work, the crystallinity of PC with different kinds of solvents was measured by DSC. Then, the correlation was analyzed by using the Hansen solubility parameter distance (Ra) and interaction parameter (χ). In addition, the morphology of crystals and depth of crystal region were analyzed by SEM.
신용순(Shin, Yong Soon),이정아(Lee, Jeong A),배소현(Bae, So Hyun),이수연(Lee, Su Youn),장민경(Jang, Min Kyeong) 기본간호학회 2013 기본간호학회지 Vol.20 No.2
Purpose: The study was done to define complementary and alternative medicine (CAM) use among primary brain tumor patients and factors influencing use. Methods: The study was conducted with convenience sampling in 5 neuro-oncology centers in Seoul and Gyeonggi Province. Data were collected using a 25-item questionnaire developed by the researchers. Results: Of 250 patients approached, 231 (92.4%) agreed to participate. Overall, 26.8% of the respondents used CAM and the average cost for CAM use was 300,000 KRW. More than 72% of CAM users did not disclose CAM use to their health care professionals. The most frequently used therapy was natural products including mushrooms. Logistic regression analysis revealed that an education level of university or higher (OR=2.92, 95% CI=1.56-5.44, p=.001), unemployment (OR=1.99, 95% CI=1.04-3.80, p=.037), and WHO grade III & IV tumors (OR=2.18, 95% CI=1.07-4.72, p=.048) were significant factors influencing CAM use. Conclusion: Three out of ten brain tumor patients spend substantial sum of money for CAM. In these situations, health care professionals should be aware of this phenomenon and provide adequate information and consultation to the patients.
방사선(학)과 Apron 성능평가 및 관리 조사-대구, 경북지역 4개 대학교-
최범희,김용국,박서현,신용일,유영준,김예리,박창희,Choi, Beom-Hee,Kim, Yong-Gug,Park, Seo-Hyun,Shin, Yong-Il,You, Young-Jun,Kim, Ye-Ri,Park, Chang-Hee 대한디지털의료영상학회 2013 대한디지털의료영상학회논문지 Vol.15 No.1
This study evaluated the apron quality management and shield efficiency in the education laboratory for radiology students. For making a proposal of effective control of lead apron, Eighteen aprons, used in 4 university laboratories of dae-gu, Kyungpook area, were analyzed regarding their uniformities, transmission doses, lead equivalent and shield efficiencies. In conclusion, the lead apron uniformity was generally good. Also, the shield efficiency corresponding to lead equivalent was high. However, the quality control of lead apron was not satisfactory. Since there is a potentially possible chance for students to be exposed to a radiation during practical radiation-training in the education laboratory, the quality-control maintenance of the lead apron should be unceasingly maintained for the radiation protection.
문상태(Sang Tae Moon),신용현(Yong Hyun Shin),구병수(Byung Su Gu) 대한한방신경정신과학회 2000 동의신경정신과학회지 Vol.11 No.1
This study was aimed to get the course which is caused by Neuropsychiatric symptoms in Sang-Han. Therefore this study is based on 『Euhak-Ipmun. Sang-Han』(『醫學入門.傷寒』) classfied mainly by symptoms. The results were summerized as follows: 1. Neuropsychiatric symptoms in 『Euhak-Ipmun. Sang-Han』(『醫學入門. 傷寒』) are explained as Pal-Gang(八綱), which shows those are settled down to a systematic oriental medical theory. 2. Pal-Bup (八法) used in the cure of symptomatische psychose in 『Euhak-Ipmun. Sang-Han』(『醫學入門. 傷寒』), which is intended to boost the effect of cure, choosing the respondent cure method about various causes. 3. Pal-Gang(八綱) and Pal-Bup(八法) in『Euhak-Ipmun. Sang-Han』(『醫學入門·傷寒』) are improved by Lee-Chun(李 ) who added Jang-gi(張機)`s Sang Han theory and new medical thought in the ages of Geum. Won. 4. Lee-Chun(李 ) believed that Neuropsychiatric symptoms which appeared in Sang Hang is caused by the Unbalance(不平). So he wanted to reach harmony of Jeong(精), QI(氣), Shin(神), Hyul(血) after improving the status of Unbalance(『不平』) toward the status of Balance(平).