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1wt.% Bi 함유 무연황동의 인장강도와 내식특성에 대한 연구
주영석 ( Y S Joo ),이상봉 ( S B Lee ),김시영 ( S Y Kim ),주창식 ( C S Joo ),정병호 ( B H Jung ) 한국열처리공학회 2011 熱處理工學會誌 Vol.24 No.3
This study has been investigated for tensile properties with lead-free brass containing 1wt.% of Bi. And also characteristic of corrosion resistance was analyzed by polarization test. An increase of tempering temperature was found to tend to decrease tensile strength, and percentage of elongation was shown to be the lowest value at 300°C. On the other hand, the elongation was increased with an increase of tempering temperature after 300°C. The change of mechanical properties was closely related with the content and shape of acicular Witmanst?tten α formed at the interface of β phase as well as in β phase. Tensile strength had a tendency to be decreased with an increase of test temperature. The elongation was shown to be the lowest value at around 300°C, while it began to increase as test temperature rose after 300°C. It might be speculated that the reason that elongation was decreased was found to form bismuth film at the interface of α/β phase leading to be easily brittle when loaded by tensile stress. The lead-free brass containing 1wt.% of Bi had similar characteristic of corrosion resistance with a free-cutting brass with 3.4wt.% of Pb in spite of higher fraction of β phase.
김수민,주창식,김완수,Kim, Soo-Min,Joo, Chang-Sik,Kim, Wan-Soo 대한물리치료과학회 1996 대한물리치료과학회지 Vol.3 No.1
The authors studied 74 patients with cal therapy Kosin University Medical March 1994 through February 1995. The results were, as follows: 1. Average age of the subject patients was 59.3 years old, their age ranged from 20 to 84 years old, and the incidence between male and female was 1:1.24 2. In respect to the economy level the middle class revealed the highest incidence, 40(54%) in 74cases. 3. The cause of injury revealed the highest incidence in hypertension 52 patients(72 %), more than all revealed the highest incidence 23 patients(44 %) in 60th years old. 4. The form of injury revealed the highest incidence in infarction 36 patients(49 %), more then all revealed the highest incidence 13 patients (36 %) in 60th years old. 5. As for the region cerebral artery of infarction patients, middle cerebral artery was the highest region of injury 72 %. 6. As for the physical paralysis side, the left side showed higher incidence 40 patients(54 %) compared to the right side 31 patients (42 %). 7. The period of therapy was 56 days, in average extending from 7 days to II months, nore then all there were the most numerous patients within 3 weeks 28 patients(38 %). 8. The upper side of the upper lims had improved 67 patients(91 %), the lower side 48(65 %). In the cases of the lower limb, the upper side had improved 70(95 %), the lower side 58(78 %). In short, patients had improved more the lower limb than the upper limb, the upper side(elbow and shoulder part) then the lower side(wrist and finger) of the upper limb. In the cases of the lower limb, patients had improved more the upper side (knee and hip part) then the lower side(foot and ankle) 9. In the cases of patients can be walking among subject patients 55(74 %) and patients cannot be walking 19 (26 %), In the cases of patients utilized assistant apparatus 34 (62 %) among self-walking, completely patients can be self-walking 21(28 %).
이동환,이민규,감상규,김승일,주창식 한국공업화학회 1997 응용화학 Vol.1 No.2
Ion exchange performance to remove ammonia-nitrogen in water was studied using commercially available sodium base cation exchange resin in the batch and continuous column reactors. Cation exchange resin used in this study was more effective than activated carbon or zeolite for ammonia-nitrogen removal. With large resin amount or low initial concentration, ammonia-nitrogen removal characteristics was increased. On considering the relation between the breakthrough capacity and ammonia-nitrogen concentration of the influent, the use of cation exchange resin were suitable for the higher order water treatment. The commercially available strong base cation exchange resin used in this study could be effectively used as economic material for treatment of the groundwater.