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김흥식,이동녕 대한금속재료학회(대한금속학회) 1978 대한금속·재료학회지 Vol.16 No.4
Relief of residual stresses in 2024 aluminum alloy bars developed by quenching in hot water (68℃) from a solution treating temperature of about 490℃ has been studied. Various combinations of solution treatment, uphill quench, T-6 and T-4 aging treatments have been examined to find out a optimum relief condition. A new method of uphill quench has been developed, which uses boiling trichloroethylene instead of conventional high pressure vapor. The best result, in which 80% of the residual stress was relieved, has been obtained when solution treated specimen was immediately uphill quenched to boiling trichloroethylene, followed by T-6 aging. Plastic stretching :as a method of stress relief has also been studied.
김흥식,백승완,신상욱,김해규,정규섭,김인세 대한마취과학회 1998 Korean Journal of Anesthesiology Vol.35 No.3
Background : Although epidural block has been widely used to control post operative pain, still there are many problems to be solved such as inadequate pain control and difficulty in its techniques. Subarachnoid morphine and clonidine injection also has been used to control postoperative pain and as adjuvant to spinal anesthesia. We compared subarachnoid morphine or morphine and clonidine injection with epidural morphine and bupivacaine injection for postoperative pain control. Method : The effect of the different types of postoperative pain control method in low abdominal surgery were investigated. 30 patients were randomly divided into one of three groups; single intrathecal morphine injection (group M), single intrathecal morphine and clonidine injection (group M/C) and continuous epidural morphine and bupivacaine injection (group M/B) prior to induction of general anesthesia. Visual analogue scale (VAS), Prince-Henry Hospital score (PHS), patient satisfaction score and the side effects were investigated at emergence, 1, 2, 4, 8, 12, 24 and 48 hours after emergence of anesthesia. The blood pressure and heart rate were monitored 0, 5, 10 and 30 min, 1, 2, 24 and 48 hours after block for monitor the hemodynamic changes. Result : In group M/C, the VAS showed statistically significant decrease till first 24 hours after block and in group M/B after then (p<0.05). PHS and patient satisfaction scores were similar in all groups. The side effects, pruritis and nausea, by the opioids were more frequent in subarachnoid groups versus epidural group but that were tolerable without medication in most cases. In spite that systolic and diastolic blood pressures and heart rate were significantly low (p<0.05) in group M/C, there were no severe hypotension or bradycardia that need treatment. Conclusion : From these results, it seems that intrathecal morphine and clonidine combination therapy can be used as an another choice for postoperative pain control in low abdominal surgery. (Korean J Anesthesiol 1998; 35: 523∼530)
성인성 치주염환자에서 분리한 Porphyromonas gingivalis와 Prevotella intennedia의 항생제 내성에 관한 연구
김흥식,유형근,신형식,Kim, Heung-Shik,You, Hyung-Keun,Shin, Hyung-Shik 대한치주과학회 1996 Journal of Periodontal & Implant Science Vol.26 No.3
The purpose of this study was to an in estimate the antibiotic susceptibility of P. gingivalis and P. interrnedia isolate from the subgingival plaque to adult periodontitis. Six P. gingivalis and five P. intermedia bacterial strains were tested for their susceptibility to 10 antimicrobial agents under disc diffusion method and broth dilution method. Ten patients with deep pocket(6mm) were selected for this study. They had not taken antibiotics for 6 months and no history of dental treatment for 6 months before this study. The result were as follow : 1. For antibiotic disc diffusion method, six P. gingivalis and five P. interrnedia were tested with 10 antimicrobial agents which comprised penicillin, gentamycin, clindamycin, lincomycin, ampicillin, erythromycin, tetracycline, amikacin, chloramphenicol, vancomycin. The sensitive antibiotics were tetracycline, penicillin, ampicillin, vancomycin, chloramphenicol and resisitent antibiotics were lincomycin. The other antimicrobial agents were less active. 2. From the study of determination on the minimal inhibitory concentration(MIC) by broth dilution method, the MIC of tetracycline to P. gingivalis and P. intermedia were $0.5-1.0{\mu}g/ml$, $0.5{\mu}g/ml$, that of ampicillin were $1-8{\mu}g/ml$, that of clindamycin were $1-32{\mu]g/ml$, $8-16{\mu}g/ml$, that of lincomycin were $16-32{\mu}g/ml$, $2-32{\mu}g/ml$. These data suggest that tetracycline and ampicillin may be valuable drug in the elemination of P. gingivalis and P. interrnedia from the patients with adult periodontitis.
공동주택 급배수 설비소음의 실태 및 저감방안에 관한 연구
김흥식,지용균,윤세철,Kim, Heung-Sik,Ji, Yong-Kyoun,Yoon, Se-Cheol 한국음향학회 1990 韓國音響學會誌 Vol.9 No.4
As the results of actual survey of indoor noise in apartment houses, it represents that plumbing noise and floor impact noise are most unsatisfactory factors to inhabitants. In this paper, the actual condition of plumbing noise in apartment houses was measured and the methods of plumbing noise reduction are suggested. For these suggestions, the actual survey of plumbing noise and the model test on structure-borne sound of water supply pipe and drain sound were carried out. 급 배수 설비소음은 공동주택 내부소음의 설문조사 결과, 상하층간 바닥충격음과 함께 거주자에게 두드러진 불만요소로써 나타나고 있다. 본 연구에서는 이러한 공동주택 급배수 설비소음의 실태를 측정하고 실태조사와 급수관의 고체전달음 및 배수음의 저감 모델 실험 결과를 중심으로 급배수 설비소음에 관한 공법상의 저감방안을 제시하였다.