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김지환,한동빈,김기태 한국세라믹학회 1995 한국세라믹학회지 Vol.32 No.11
Creep behaviors of Cr3C2 composites containing 90 wt% Cr3C2 and 10 wt% Ni were studied at high temperature. Compression tests at 100$0^{\circ}C$ and bending tests at 100$0^{\circ}C$ and 105$0^{\circ}C$ were done in argon environment. In all test conditions primary and steady-state creep behaviors were observed. Stress exponent and activatiion energy were determined from the experimental data. By microstructural analysis of Cr3C2 composites after creep test, the separate agglomerations of Ni phase were observed. Numerical analysis was also studied to analyze bending creep behaviors of Cr3C2 by assumming different tensile and compressive creep behavior in a bending sample. From the analysis, it was found that the stress state at the compressive region as applied stress increased. The observed creep rates were compared with the predicted creep rates by estimating power-law creep parameters from bending test data.
3종의 간접수복용 복합레진의 굴곡강도 비교 및 표면관찰
김지환,김준태,박진영,김웅철 대한치과기공학회 2017 대한치과기공학회지 Vol.39 No.1
Purpose: The purpose of this study was to evaluate flexural strength, composite surface and fractured surface of three different indirect composite resins. Methods: Fifteen bar-shaped specimens (25mm x 2mm x 2mm) were fabricated for each FL group (Flow type and Light curing) and PLP group (Putty type and Light, Pressure curing) and PL group (Putty type and Light curing) according to manufacturer’s instructions and ISO 10477. Fabricated specimens were stored in the distilled water for 24 hours at the temperature of 37℃. Three-point bending strength test was performed to measure flexural strength using universal testing machine at a crosshead speed of 1mm/min (ISO 10477). Surface and fractured surface of specimens were observed by digital microscope. Results were analyzed with Kruskal-wallis tests (α = 0.05). Results: Mean (SD) of three different indirect composite resins were 83.38 (6.67) MPa for FL group, 139.90(16.53) MPa for PLP group and 171.72(16.74) MPa for PL group. Flexural strength were statistically significant (p<0.05). Differences were not observed at fractured surface among three groups. However, many pores over 100㎛ were observed at PL group in observing surface of specimen. Conclusion: Flexural strength of composite resins was affected by second polymerization method and content of inorganic filler.
수용액중에서 산소에 의한 Co-Ni 공심수산화물의 산화반응 거동에 관하여 : 페라이트법에 의한 중금속 폐수처리에 관한 연구 제2보
김지환,오재현,강남기 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.12
The oxidation behaviors of Co-Ni hydroxide coprecipitates were investigated with relation to the conditions of the solution such as R value(=2〔OH^-〕 / 〔SO^(2-)₄〕), temperature and initial 〔Ni(Ⅱ)〕/〔Co(Ⅱ)〕 molar ratio. The characteristics of reaction products were examined by composition analysis, XRD, TEM and magnetic property measurement. When increasing R value, the reaction time and particle sizes were increased. And the reaction products were Co-Ni ferrite. The amount of Co incorporated into the spinel structure increased and that of Ni decreased with increasing R value and temperature. In reaction products represented by Co, Ni_yFe_(3-(x+y))O₄, the amount of (x+y) shows the ranges between 0.6 and 0.7, regardless of R value and temperature. In the conditions of R=1.5, 70℃, 〔Co(Ⅱ)+Ni(Ⅱ)〕/〔Fe(Ⅱ)〕 ratio 0.5, 〔Ni(Ⅱ)〕/〔Co(Ⅱ)〕 ratio =2.0 in the initial solution, Co and Ni incorporated with equal amounts into spinel structures and the reaction product of Co_(0.29)Ni_(0.29)Fe_(2.41)O₄ was obtained.
급성 두드러기로 인한 학질양 발열을 보이는 소양인 치험례
김지환,손한범,배효상,박성식,Kim, Ji-Hwan,Son, Han-Beom,Bae, Hyo-Sang,Park, Seong-Sik 사상체질의학회 2014 사상체질의학회지 Vol.26 No.1
Objectives The purpose of this case study is to report the effect of Sasang constitutional therapy about chill and fever pattern of malaria by acute urticaria. Methods This Soyangin patient is treated by herbal prescriptions, venesection, and acupuncture therapy according to the change of symptoms. When fever is severe, adequate medical supportive treatments such as normal saline intravenous injection, sedative or anti-histamine are provided for the patient. Results & Conclusions The patient's symptoms of acute urticaria and general conditions were improved after using Yangdokbaekho-tang and Hwagam. However, chill and fever pattern of malaria was continued so that Hyungbangpaedok-san and Dokhwaljihwang-tang for Soyangin's lasting malaria symptom were medicated to the patient. Accordingly, chill and fever pattern lasting about one month was successfully eliminated after herbal treatment.