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조무식,김선주,원혜윤,고정관,이경석 순천향의학연구소 1997 Journal of Soonchunhyang Medical Science Vol.3 No.2
We report a series of 220 patients with low back pain who visited through neurosurgical out-patient department(OPD) from January 1994 to June 1994. We investigated how they were treated and what was the outcome on December 1995 by telephone interview. During the study period, 176 patients (80%) visited our OPD not more than twice. Frequency of OPD visit was single in 138 patients (62.7%), twice in 38 patients (17.3%), and over twice in 44 patients (20.0%). Twenty six patients (11.8%) were admitted, and 16 patients (7.3%) underwent an operation. Sixteen patients underwent surgery in this hospital, and the other 12 patients underwent surgery in any other hospitals. The rate of revisit was relatively high in patients who had a special study (58.1%), whose impression was herniated lumbar disc (41.2%) or degenerative spondylosis (55.6%), and who received prescriptions for drug (42.1%) or underwent an operation(87.5%). The rate of special study, prescriptions and/or operations of was relatively low in this hospital, which seems to lessen the rate of revisit. More active management seems to be necessary for the patient' satisfaction.
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에틸렌옥시드기를 갖는 가지형 고분자전해질의 합성과 특성
김민아 ( Min- Ah Kim ),원혜윤 ( Hae- Yoon Won ),이호식 ( Ho- Sik Lee ),류상욱 ( Sang- Woog Ryu ) 충북대학교 산업과학기술연구소 2016 산업과학기술연구 논문집 Vol.30 No.2
In this study, branched polymers containing ethylene oxide unit in different composition were synthesized by radical copolymerization of poly(ethylene glycol)methyl ether methacrylate(POEM) 950 g/mol(POEM 950) and POEM 450 g/mol(POEM 450). Solid polymer electrolyte was then prepared by the addition of LiClO<sub>4</sub> to POEM copolymer in acetonitrile solvent. The thermal transition and electrical properties such as an ionic conductivity and electrochemical stability were evaluated in aspect of lithium ion concentration. The glass transition temperature appeared in the range of -50 ∼ -30 ℃ and changed by the amount of POEM 950 and POEM 450. In addition, polymer electrolytes showed highest ionic conductivity in the copolymer containing weight ratio of POEM 450 and POEM 950 of 25 : 75 and reached to 4.0 × 10<sup>-5</sup> S/cm at room temperature. Linear sweep voltammetry measurements showed that the POEM copolymer electrolytes were stable within 2 ∼ 5 V range at room temperature.
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