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폴리에테르설폰/다관능성 에폭시 블렌드의 경화거동 및 강인화 특성
원종성(Jong Sung Won),이지은(Jee Eun Lee),박종규(Jong Kyoo Park),이만영(Man Young Lee),강송희(Song Hee Kang),이승구(Seung Goo Lee) 한국고분자학회 2019 폴리머 Vol.43 No.1
본 연구에서는 triglycidyl p-aminophenol(TGAP)/diglycidylether of bisphenol F(DGEBF) 에폭시 수지의 polyethersulfone(PES) 첨가에 따른 경화 거동과 파괴인성을 연구하였다. 경화 거동은 DSC 분석에 의해 승온 및 등온 조건에 따라 연구를 진행하였다. 승온분석에서는 Ozawa와 Kissinger법을 이용하여 다양한 승온속도에서 얻어진 발열피크로부터 활성화에너지를 도출하였다. 또한 등온분석에서는 TGAP/DGEBF 에폭시 블렌드의 자촉매 효과를 고려한 Kamal의 속도모델을 이용하여 분석을 진행하였다. TGAP/DGEBF 에폭시에 대한 PES 함량에 따른 블렌드의 인장과 굴곡특성 및 파괴인성을 분석하였으며, 파괴인성 시험 후 파단면의 표면형태학적 변화도 관찰하였다. 결과적으로, TGAP/DGEBF 에폭시에 대한 PES의 첨가는 경화도와 경화속도 및 활성화에너지에 큰 영향을 미치지 않았으나, 인장강도, 굴곡강도, 굴곡탄성률은 저하되었다. 반면, 파괴인성에서는 PES 함량이 증가함에 따라 임계응력 세기인자와 임계변형에너지방출률 모두 증가하였다. The cure behaviors and toughness properties of triglycidyl p-aminophenol/bisphenol F diglycidylether resin system with 4, 4-diaminodiphenylsulfone hardener were studied with the inclusion of polyethersulfone (PES). The cure kinetics of epoxy blends were investigated in both dynamic and isothermal conditions by differential scanning calorimetry (DSC). In dynamic experiments, the activation energy was evaluated by Ozawa and Kissinger’s equations at different heating rates (2~40 ℃/min). Isothermal DSC data at different temperatures (160~220 ℃) are fitted to an autocatalytic Kamal kinetic model. The tensile, flexural, and fracture toughness of the epoxy blends were investigated by taking into account their morphological features, which were influenced by the PES contents. Consequently, the results obtained from cure behavior studies further indicated that the degree of cure, rate of cure, and activation energy of the epoxy resins were not largely affected by the PES inclusion, while fracture toughness values of them increased with the PES content.
육군자탕(六君子湯)이 흰쥐의 위(胃) 배출능(排出能)에 미치는 영향
원종만,윤상협,Won, Jong-Man,Yoon, Sang-Hyub 대한한방내과학회 2007 大韓韓方內科學會誌 Vol.28 No.2
Backgrounds & Objectives : Yukgunjatanggranule (YGJT) ha been used for the treatment of functional dyspepsia, regarded as one of the gastric dysmotility diseases, but its mechanisms of cation are not yet well known, We investigated the effects of YGJT on gastric emptying and its mechanisms of action in rats. Methods : Gastric emptying was measured by glass beads (1mm in diameter) expelled from the stomach for 1 hour and 2 hours after administration ofnormal saline (NS) or YGJT 41.6mg/kg or 124.8mg/kg in rats. By the same method, gastric emptying was measured only for 2 hours after administration of NS of YGJT 124.8mg/kg in rats treated with atropine sulfate (1mg/kg, s.c), quinpirole HCl(0.3mg/kg, i.p.), NAME (NG-nitro-L-arginine methyl ester, 75mg/kg, s.c.) or cisplatin (10mg/kg, i.p.) to delay gastric emptying. Results : YGJT 124.8mg/kg improved gastric emptying more than NS or YGJT 41.6mg/kg (p=0.046). Under delayed gastric emptying, YGJT 124.8mg/kg improved gastric emptying in the group treated with cisplatin ($3.1{\pm}1.3$ vs. $6.6{\pm}3.1$, p=0.015), quinpirole HCl ($4.7{\pm}2.8$ vs. $5.5{\pm}5.6$, p=0.874) and NAME ($2.2{\pm}1.4$ vs. $4.7{\pm}6.0$, p=0.414), but aggravated it with atropine sulfate ($1.8{\pm}0.9$vs. $1.7{\pm}1.0$, p=0.957). Conclusions : YGJT improves gastric emptying through the cholinergic pathwas, and shows some effect against the toxicity of cisplatin. Therefore, we expect that it would be effective in relieving gastrointestinal symptoms in functional dyspepsia patients and cisplatin-treated patients.
만성 뇌졸중 환자의 보행속도와 보행 비대칭에 영향을 미치는 무릎근력과 발목 관절가동범위
원종임 ( Jong Im Won ),안창만 ( Chang Man An ) 한국전문물리치료학회 2015 한국전문물리치료학회지 Vol.22 No.2
The common features of walking in patients with stroke include decreased gait velocity and increased asymmetrical gait pattern. The purpose of this study was to identify important factors related to impairments in gait velocity and asymmetry in chronic stroke patients. The subjects were 30 independently ambulating subjects with chronic stroke. The subjects’ impairments were examined, including the isokinetic peak torque of knee extensors, knee flexors, ankle plantarflexors, and ankle dorsiflexors. Passive and active ranges of motion (ROM) of the ankle joint, ankle plantarflexor spasticity, joint position senses of the knee and ankle joint, and balance were examined together. In addition, gait velocity and temporal and spatial asymmetry were evaluated with subjects walking at their comfortable speed. Pearson correlations and multiple regressions were used to measure the relationships between impairments and gait speed and impairments and asymmetry. Regression analyses revealed that ankle passive ROM and peak torque of knee flexors were important factors for gait velocity (R2=.41), while ankle passive ROM was the most important determinant for temporal asymmetry (R2=.35). In addition, knee extensor peak torque was the most significant factor for gait spatial asymmetry (R2=.17). Limitation in ankle passive ROM and weakness of the knee flexor were major contributors to slow gait velocity. Moreover, limited passive ROM in the ankle influenced the level of temporal gait asymmetry in chronic stroke patients. Our findings suggest that stroke rehabilitation programs aiming to improve gait velocity and temporal asymmetry should include stretching exercise for the ankle joint.