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평균응력을 포함한 피로하중 하에서 Elbrodur-NIB의 피로수명예측 및 Ratcheting 거동
임창범(Chang-Bum Lim) 한국항공우주학회 2011 韓國航空宇宙學會誌 Vol.39 No.7
동합금 Elbrodur-NIB 재질에 대해 평균응력을 포함한 응력제어시험을 수행하였으며, 그 결과 라체팅 거동에 응력진폭, 평균응력, 응력속도가 어떠한 영향을 주는지에 대해 시험을 통해 알 수 있었다. 라체팅 변형률은 같은 평균응력에서 응력진폭이 증가할수록, 또한 같은 응력진폭에서 평균응력이 증가함에 따라 같이 증가하는 것을 볼 수 있었다. 그러나, 응력속도가 증가함에 따라 라체팅 변형률은 감소하는 것을 알 수 있었다. 10²-10? 영역에서 3가지 평균응력을 포함한 피로수명예측모델을 검토하였으며, 그 결과 Smith-Watson-Topper가 제안한 모델과 Walker가 제안한 모델이 매우 신뢰성 있는 결과를 보여주었다. An experimental study was carried out for the Elbrodur-NIB(copper alloy) at room temperature under stress-controlled uniaxial fatigue loading with and without mean stress. As a result, the effects of stress amplitude, mean stress and stress rate on ratcheting behavior were investigated. The ratcheting strain increased with increasing stress amplitude for a given mean stress, and with mean stress for a given stress amplitude. But, the ratcheting strain decreased as the stress rate increased. The three mean stress models were investigated and the mean stress models of Smith-Watson-Topper and Walker yielded good correlation of fatigue lives in the life range of 10²-10?cyc1es.
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단열재와 상변화물질을 이용한 비행체 전자장비의 열방호 설계에 대한 개념적 연구
최홍석(Hong Seok Choi),이호준(Hong Seok Choi),임창범(Chang-Bum Lim),이재환(Jaehwan Lee),유정규(Jung-Kyu Ryou) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
Electronics onboard flight vehicles are exposed to high temperature because of aerodynamic heating and heat generation inside the electronics. Thermal protection methods and design approach of flight vehicle electronics using insulators and phase change material are presented in this paper.
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신이식 100예에서 이식신의 예후에 영향을 미치는 인자
편도철(Do Chul Pyun),정인권(In Kweon Jung),임창범(Chang Bum Lim),양영란(Young Ran Yang),임정식(Jeong Sik Lim),김종진(Jong Jin Kim),하봉준(Bong Jun Ha),김홍기(Hong Khee Kim),이시래(Si Rhae Lee),이승도(Sung Do Lee),류현열(Hyun Yul Rhew 대한내과학회 1989 대한내과학회지 Vol.37 No.5
N/A It has been reported that many factors other than HLA and the mode of immunosuppression influence the results of renal transplantation. The factors are constantly changing with the advances in surgical techniques and introduction of Cyclosporin-A s-A), etc. We analyzed the possible prognostic factors in 100 cases of renal allograft which were performed by the transplantation team of Kosin Medical College from Dec. 1984 to Aug. 1988. Detailed results are presented for the several factors as follows: 1) HLA and the mode of immunosuppression. Excluding 9cases of graft failure due to non-immunological causes, the actuarial graft survival in 3 years was 100% in the E3LA-II) group, 95.1% in the HLA-HID group and 84.6% in the LUR group. In the HLA-HID group, the 3 year graft survival (3YGS) was 96.8% in the Cs A+P treated group and 93.3% in the Aza+P treated group, and the difference in these 2 groups was not significant statistically (p>0.1). Numbers of patients with serum creatinine equal or above 2 mg/dl were 5 of 17cases (29.4%) in the Aza+P treated HLA-HID group, and 8 of 47cases (17.1%) in the Cs-A+P treated HLA-HID group, but the difference was not significant statistically (p>0.1). 2) Pretransplant transfusions. Twenty-seven cases which were transfused with more than 10 units of packed red cells were 100% in 3YGS and the other cases were 97.8% in 3YGS, And there was no significant difference between Aza+P and Cs A+P treated HLA-HID groups in relation to transfusion (p>0.1), 3) Donor and recipient age. The 3YGS in donors older than 50 years and in those 50 years old and under were 93.796 and 94.895, respectively, The percentages of cases with serum creatinine equal or above 2mg/dl were 26. 5% in the older than 50 years group and 12.3% in the other group, but the difference was not significant statistically (p>0.1). Thirteen cases older than 60 years were 10096 in 3YGS. Recipient age had no significant effect on 3YGS between the older than 50 years group and the other group (p>0.1). 4) Donor and recipient sex. The 3YGS was highest (100%) in the male to male group and lowest (87.5%) in the male to female group, but the difference was not significant in these 2 groups (p>0.1). 5) Minor ABO incompatibility. Seventeen cases with minor ABO incompatibility were 100% in 3YGS, and in remaining compatible 74 cases, the 3YGS was 93.4% and there was no significant difference (p>0.1). In summary, the 3YGS was higherst in the HLA-ID group, and there was no signifcant difference in 3YGS between Aza+P and Cs A+P treated HLA-HID groups. And the elder (more than 50 years or 60 years) donor group did not show lower 3YGS than the younger age group despite somewhat worse graft function. There appears to be a minimal effect with mismatch of sex and minor ABO incompatibility. And the fact that there is no significant relation between pretransplant transfusion and 3YGS seems to be due to DST, which was done in all cases except HLA-ID and 2cases of the HLA-HID group.
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B형 만성활동성간염에 대한 Adenine Arabinoside 및 α - Interferon 의 치료효과
구자영(Ja Young Koo),박병채(Byung Chae Park),허만하(Man Ha Huh),이성숙(Sung Sook Lee),임창범(Chang Bum Lim),편도철(Do Chul Pyun) 대한소화기학회 1989 대한소화기학회지 Vol.21 No.1
N/A To evaluate and compare therapeutic efficacy of adenine arabinoside (Ara-A) and alpha interferon (alpha-INF), 59 patients with biopsy proven chronic active hepatitis B were randomized to receive Ara-A (15 mg/kg/day for 10 days) or alpha-INF (total dose: 108 million units) and followed up 6 months after completion of therapy.All patients were HBeAg positive. Clinical effects of Ara-A and alpha-INF on seroconversion of HBeAg and levels of serum alanine aminotransferase (ALT) were closely matched and compared with those of untreated control group (30 cases). Seroconversion of HBeAg in alpha-INF treated group (30 cases) was observed in 11 cases (36.7%), showing higher seroconversion rate as compared to Ara-A treated (6/29 cases, 20.7%) and to control patients (0/30 cases, 0%). There were no effects of Ara-A on ALT levels in the treated patients as compared with the untreated control patients. However, ALT levels in the interferon treated patients were remarkably (p<0.005, ALT levels at 6 months after treatment: 83.37±98.83 IU/L) reduced as compared with the level of pretreatment level (256.74 ± 175,83 IU/L). The present study, thus, indicates that Ara-A is not recommended as a first choice of therapy in the treatement for the patients with HBeAg positive CAH, but interferon may be recommended for those patients and further study will be necessary with prolonged follow up.
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