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금형온도 조건에 따른 PPS 복합수지의 물리적 특성 변화 연구
엄찬혁(Chanhyuk Um),정도현(Dohyun Jung),유승용(Seung Yong Yu),이상선(Sang Sun Lee),이현욱(Hyun Wook Lee),이평찬(Pyoung-Chan Lee),고윤기(Youn Ki Ko),정선경(Sun Kyoung),하진욱(Jin Uk Ha) 한국고분자학회 2020 폴리머 Vol.44 No.6
폴리페닐렌 설파이드(PPS) 수지는 용융온도가 290℃ 이상이며, 내화학특성이 매우 우수한 결정성 슈퍼 엔지니어링 플라스틱이다. 소재가 지닌 우수한 특성으로 금속소재를 대체할 수 있는 화학 소재로 주목받으면서 선진국에서는 관련된 많은 연구가 진행되고 있지만, 국내에서는 소재가 지닌 우수한 특성에도 불구하고 아직 다양한 연구가 진행되지 못하고 있다. 본 연구에서는 PPS 수지의 금형 온도조건 변화에 따라 달라지는 PPS의 결정화도를 분석하였으며, 결정화도에 따른 수지의 물성변화 경향을 분석하였다. PPS 소재를 적용한 부품의 금형온도에 따른 물성변화 값을 측정하여 시편 사출물과 강성 특성을 비교 분석하였다. Polyphenylene sulfide (PPS) is well known semi-crystalline super engineering plastic which is having a very high melting temperature (above 290℃) and strong chemical resistance. Research on replacing metallic materials with PPS is going on due to its superior properties. However, PPS is the material that does not have much attention in Korea as compared to the other developed countries. In this research, the crystallinity of the resin was influenced by the mold temperature, as a result, physical properties such as tensile strength, thermal properties were changed. Analyses were carried out with specimen and automotive molded part.
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고유수용성신경근촉진법(PNF) 수축-이완 기법의 직접적 간접적 방법의 비교
김난영,김은혜,김현지,김희온,박순우,박슬기,유승용,유지연,이현옥,Kim, Nan-Young,Kim, Eun-Hye,Kim, Hyeon-Ji,Kim, Hee-On,Park, Sun-U,Park, Seul-Gi,Yu, Seung-Yong,Yu, Ji-Yeon,Lee, Hyun-Ok 대한고유수용성신경근촉진법학회 2016 PNF and Movement Vol.14 No.1
Purpose: The purpose of this study was to determine the effectiveness of direct and indirect methods of contract-relax techniques in proprioceptive neuromuscular facilitation (PNF) stretching for improving hamstring flexibility. Methods: Twenty-six subjects were randomly assigned to either a direct contract-relax technique group or an indirect contract-relax group. For each group, stretching intervention was performed three times a week for a period of two weeks, with 12 seconds for the contraction and 10 seconds for the relaxation per once. The direct contract-relax technique for hamstring flexibility was applied by asking the subject to press down on the shoulder of the trainer in the straight leg-raising position. Conversely, the indirect contract-relax technique was performed by raising the leg with resistance. To facilitate a comparative analysis of hamstring flexibility between the two groups before and after the stretching intervention, two-way repeated ANOVA was performed. Hamstring flexibility for each group was measured using a passive straight leg-raising test. Results: The results showed significant improvement in hamstring flexibility for all subjects in the two groups. However, there was no significant difference between the groups. Conclusion: In conclusion, both direct and indirect contract-relax techniques are confirmed to be useful for improving hamstring flexibility. The choice of suitable technique has to be made individually according to the condition of each subject.
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서울중앙병원에서 IMx를 이용한 혈장내 총Homocysteine의 측정
한태진 ( Tae Jin Han ),신연수 ( Yeun Soo Shin ),유승용 ( Seung Yong Yu ),장진연 ( Jin Yeon Jang ),조병철 ( Byoung Cheol Cho ),전사일 ( Sa Il Chun ),민원기 ( Won Ki Min ) 대한임상검사과학회 2000 대한임상검사과학회지(KJCLS) Vol.32 No.3
Background : Elevated plasma homocysteine (HCY) levels are considered to be an independent risk factor in coronary 따tery disease, cerebrovascular disease, and peripheral vascular disease. Currently HPLC fluoremetric detection has been most widely used for the quantitation of homocysteine. Recently IMx homocysteine assay by use of a fluorescence polarization immlUloassay(FPIA) has been introduced that enables rapid quantitation of plasma homocysteine levels. We evaluated the performance of the IMx@ Homocysteine assay and compared it to routinely used HPLC method. Methods Within-run precision, between-run precision, degree of correlation, linearity, and reportable ranges were analyzed, according to National Committee for Clinical Laboratory Standarili잉 guidelines as much as possible. To establish a reference interval 148 apparently healthy adults were investigated (81 males, 67 females). For the methods comparison We selected 20 patients admitted to the Asan Medical Center. The total plasma homocysteine concentraton was measure by FPIA (lMx""J Homocysteine assay, Abbotte Laboratories, IL, USA) and by HPLC (HPll00, Hewlett Packard com., Germany) using Bio-rad@ Homocysteine kit (Bio-Rad Laboratories, CA, USA). The caIculations were performed with computer software, EP Suit(MarChem Associates, Concord, USA). Result : The within run coefficients of variations (CVs) of the low, medium, and of the high control were 1.8%, 1.5% and 1.5%. The between run CVs were 2.8%, 1.4% and 1.0%, respectively. Method was linear and passed lack of fit. Reportable range was found to be 0.5-50.0 μ molfL. The reference interval from hea1thy adu1ts was 10.3 i: 5.54(mean i: SD) μ molfL. Total plasma homocysteine levels according to sex were 11.9 i: 6. 89(mean i: SD) μ molfL for male, 8.39i: 2.03(meani: SD) μ mol/L for female, respectively. The comparison between FPIA (y) and HPLC(x) resu1ted in a linear regression analysis described by the equation : y=0.9463x-0.2364 with a correlation coefficient r=0.9961 Conclusions Linearity, pricision, reportable ranges of the IMx homocysteine were satisfactory. The IMx homocysteine also correlated well with HPLC method. The normal range, determined by testing apparent1y hea1thy adu1ts, is in agreement with the literature. πle IMx homocysteine assay is fast and easy to perform and very useful for routine determinations of plasma homocysteine levels.
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