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非晶質 엔지니어링 플라스틱의 塑性 變形速度와 內部摩擦係數에 關한 硏究
崔垣宗 한국항공대학교 1991 論文集 Vol.29 No.-
비정질 재료의 변형 거동을 연구하기 위해, 엔지니어링 플라스틱의 일종인 폴리카보네이트에 대한 인장 시험을 실시하였다. 변형에 따른 내부 구조 변화에 민감한 내부 마찰계수 측정을 위해 1Hz의 micor-torsion을 동시에 가하였다. 변형 속도가 증가함에 따라 유동응력과 내부마찰계수가 증가하며 이들 사이에 일정한 관계가 성립함을 알 수 있었다. Stress dip test를 실시하여, 앞서 얻은 실험식을 검증하였다. An experimental study on the plastic deformation behavior of amorphous glassy polycarbonate has been performed, using internal friction measurements at 1Hz by micro-torsion during tensile tests. The result of tensile tests at different strain rates shows flow stress and internal friction increase with plastic strain rate. The empirical equation of strain rate and internal friction has been established and validated by stress dip test.
Ceramic Fiber로 보강된 Al 복합재료의 제조공정에 관한 연구
최인호,최원종 한국 항공대학교 항공산업기술연구소 1995 航空宇宙産業技術硏究所 硏究誌 Vol.5 No.-
In the present study, the bending test and microhardness test of aluminium alloy reinforced with various amounts of Al₂O₃fiber and SiC whiskers were investigated Composites have been produced by rheo-casting, powder metallurgy process and liquid-metal infiltration. To analyse wetting mechanisms, the cross-sections of composites were examined by scanning electron microscopy(SEM). The results have shown that the composites produced by liquid-metal infiltration gave better properties than those produced by rheo-casting &powder metallurgy process, primarily due to the decrease of porosity and reinforcement cluster. For liquid-metal infiltration composites, a good adhesion between the fiber and matrix was found. Three point bending test results have shown that there is an increase in flexural modulus with reinforcement addition. The effect of Al₂O₃ fiber on the age-hardening characteristics is shown that this ceramic reinforcement can affect the age-hardening behaviour of the matrix alloy by significantly accelerating the kinetics of precipitation.
비연소식(非燃燒式) 구법(灸法) 재료(材料)를 이용한 온열자극(溫熱刺戟)이 체열방사(體熱放射)에 미치는 효과
최원종,김재효,김경식,손인철,Choi, Won-Jong,Kim, Jae-Hyo,Kim, Kyung-Sik,Sohn, In-Chul 경락경혈학회 2004 대한침구의학회지 Vol.21 No.3
Objectives : Moxibustion has been become very useful tool to prevent and treat various diseases with acupuncture in oriental medicine. Expecially, moxibustion combining the heat stimulation and chemical stimulation of Artemisiae Argyi has a non-invasive characteristics comparing to the other therapeutic tools. However, because the moxibustion makes the patient's skin be burn by the combustible feature of moxibustion, most of people have been scared of being scald. Methods : In this study, we have developed new non-combustible moxibustion tools in collaboration with company (Hana Medical, co. and ICURE, co.) and tested the efficacy through effects of moxibustion of Cheon-chu $(ST_{25})$ on the abdominal thermography of health subject. The non-combustible moxibustion has main characteristics of controlled heating to inhibit being scald and heat stimulation lasting over 1 hrs. Also, to induce the chemical stimulation, the bottom contacting with skin was coated by the extract of artemisiae argyi. The volunteers who participating in this study had taken rest for 20 - 30 mins in room temperature $(23-25^{\circ}C)$ before the examination and informed them what to prohibit smoking, drinking and administration of drug for the previous day The thermography of abdomen including a below part of the chest was taken using Infra-Red Imaging System (IR 2000, MEDI-CORE Co., Korea) by time interval of 15 minutes. Results : The results showed that moxibustion of Cheon-chu $(ST_{25})$ had more potencies of changes on all the ROIs of abdominal thermography than those of control group. Also, it was observed that the quantities of thermal changes following moxibustion of Cheon-chu $(ST_{25})$ been increased significantly comparing that of control group at all the ROIs (region of interest). Observed the thermography classified by ROI, however, moxibustion of Cheon-chu $(ST_{25})$ could modulate ipsilateral specific areas concerning to the abdominal pathway of Stomach Meridian. Conclusion : These results suggest that new non-combustible moxibusion has some similarity as like as the conventional moxibustion and moxibustion of Cheon-chu $(ST_{25})$ may modulate thermal changes of abdominal areas.