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AC8A-T6 알루미늄 合金材의 切削加工 特性에 關한 硏究
최현민,김경우,김우순,김용환,김동현,채왕석 한국공작기계학회 2002 한국공작기계학회 추계학술대회논문집 Vol.2002 No.-
In this study, examined the cutting characteristics of alumuminum alloy AC8A-T6 that is used to present car piston materials. And in been holding materials machining empirically escape as result that experiment comparison changing the cutting speed and feed on various condition to choose efficient machining condition. The following results can be summarized from this research. 1.As the cutting speed decreased, principal cutting force and thrust cutting force is increased, and reason that cutting force interacts greatly in the low cutting speed is thought by result by BUE's stabilization. 2.The feed speed and cutting speed increase, friction factor is decrescent and the cause appeared the thrust cutting force is fallen than cutting force relatively because chip flow according to increase of the feed rate is constraint. 3.Though specific cutting resistance grows cutting area and the feed rate are few, the cause was expose that shear angle decreases by rake face of tool gets into negative angle remarkably as wear of a cutting tool or defect part of workpiece is cut. 4.Cutting speed do greatly depth of cut is slow, surface roughness examined closely through an experiment that becomes bad, and know that it can get good surface that process cutting speed because do feed rate by 0.1㎜/rev low more than 250m/min to get good surface roughness can.
김동현,채왕석 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.1
This paper is experimental study of machining characteristics about martensitic heat resisting steel STR11. Machining characteristics are different according to internal quality(chemical compositions, microscopic structure and nonetallic inclusion), mechanicla properties (tensile strength value, impact value and hardness) and dynamic cutting force Following are the results; 1. In analyzing internal quality, test materials have typical martensite structure and a minute needle-shaped structure. 2. Tensile strength and reduction of area and hardness are larger. But, valucs of elongation and impact values are smaller. Fracture surface of tensile specimen is duchile. 3. Cutting force is decreasing with cutting speed increasing. 4. Cutting force is increasing with feed speed increasing.
半夏瀉心湯이 CCl4 로 유도된 간중독 흰쥐에 미치는 영향
朱旺錫,朴賢俊,尹炳局,鄭成伊,朴宣東 대한본초학회 1999 大韓本草學會誌 Vol.14 No.2
The purpose of this study is to observe the effect of Banhasasimtang on serum reaction in CCI₄ treated rats. In this study the experimental rats divided five group(Normal, Control, Sample A, Sample B and Sample C group) Under the same condition Normal group was fed basal diet and water, Control group was injected carbon tetrachloride(CCI₄ 0.5㎖/㎏) and basal diet for 2 weeks, Sample A group was injected carbon tetrachloride(CCI₄0.5㎖/㎏) and fed the Bahasasimtang extract(10㎖/㎏) for 2 weeks, Sample A group was injected carbon tetrachloride(CCI₄ 0.5㎖/㎏) and fed the Banhasasimtang extract(10㎖/㎏) for 2 weeks, Sample B group was fed the Banhasasimtang extract(10㎖/㎏) for 2 weeks and injected carbon tetrachloride(CCI₄ 0.5㎖/㎏), Sample C group was fed the Banhasasimtang extract(10㎖/㎏) for 2 weeks. The change of GOT, GPT, γ-GPT, ALP, LDH activity and Bilirubin level in blood serum. The obtained results are summarized as follows : 1. In the change of GOT GPT contents, as compared with control group, sample group was significantly decreased. 2. In the change of γ-GPT contents, as compared wth control group, sample group was significantly decreased. 3. In the change of ALP contents, as compared with control group, sample group was significantly decreased. 4. In the change of LDP contents, as compared with control group, sample group was significantly decreased. 5. In the change of Bilirubin contents, as compared with control group, sample group was significantly decreased.
朴宣東,朴賢俊,朱旺錫 대한본초학회 2001 大韓本草學會誌 Vol.16 No.1
This study was performed to research the antioxidant activities of Guibitang and its component groups. The experimental group was divided into six group: Guibitang (GB), Gamiguibitang (GA), Hyul-yak group (GB1), Gi-yak group (GB2), Ansinhaenggi-yak group (GB3) and Gami-yak group (GA1). The results were obtained as follows: In vitro All experimental groups had antioxidant activity in linoleic acid system on concentration in comparison with control group. And in DPPH radical scavenging experiment, all experimental groups had scavenging activity on concentration, especially GA1 group was higher than any others. The inhibitory effect experimental groups had inhibitory effects of superoxide generation on concentration, and the effect of Guibitang was better than Gamiguibitang. In component groups GA1 was highest and GB1 was lowest respectively. The inhibitory effect experiment on lipid peroxidation reaction in H₂O₂-Fe^2+ system showed that each experimental groups had inhibitory effects on lipid peroxidation reaction compared with control group. And GA1 group exhibit the best inhibition effect on lipid peroxidation reaction. In vivo the amounts of lipid peroxide rat on the level of serum was reduced in comparison with control group, especially gamiguibitang. The amounts of LPO on the level of liver was also reduced compared with control group. espeially gamiguibitang, guibitang, GB1 group. In hepatic catalase activity test, all experimental groups increased catalase activity, and that of guibitang, gamiguibitang, GB1 group were evident. The amounts of hepatic glutathione of experimental group increased in comparison with control group. And that of gamiguibitang, guibitang was more significant than component group.
복합 운동프로그램이 초등학생의 신체구성, 혈중지질 및 체력에 미치는 영향
전종귀,이왕록,박희근,정준현,이영란,신동원,이경숙 충남대학교 체육과학연구소 2006 體育科學硏究誌 Vol.23 No.1
The purpose of the present study was to examine the effects of combined training on the changes of body composition, blood lipid profile and fitness in elementary school students. Thirty subjects participated in the present study. The subjects were divided into two groups either exercise group for 10weeks(15n) or control group for 10weeks(l5n) The results were described as follows; 1) There were significant differences in the body weight and lean body mass after the exercise program between two groups. 2) There were no significant differences in the blood TC, HDL-C, LDL-C, TG concentration after the exercise program between two groups. 3) There were significant differences in the sit-up and flexibility after the exercise group between two groups. In conclusion, it might be thought that the combined training improved the levels of body composition and health-related fitness in elementary subjects.
김경우,김우순,윤주식,채왕석,김동현 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-
A new methodology is presented to evaluate material properties at high strain rates and high temperatures based on orthogonal metal cutting experiments and FEM simulations. Average strain rate and average temperature found in the deformation zone are computed and flow stress data at these conditions are modified until cutting forces calculated in simulations match those determined in experiments. Material properties obtained from this method were verified by additional metal cutting simulations. Derivation from cutting forces measured in experiments was less than 10%. The feasibility of tool design using FEM simulations is also demonstrated.
오덕철,김선균,주왕기,조동현,김우호,윤경민 江原大學校附設體力硏究所 1976 江原大學校附設體育科學硏究所論文集 Vol.- No.1
The water quality of the Hong-Cheon river was investigated during the winter season. The rate of contamination of the low tide was a little more than the high tide. But all values of the analyzed-items were similar to those in the clear water.