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Fe-X%Mn-6%Si-9%Cr-5%Ni 합금의 형상기억효과에 미치는 가공열처리의 영향
백승한,전중환,최종술,한중호 연세대학교 산업기술연구소 1994 논문집 Vol.26 No.1
The effect of thermomechanical treatment on the SME(Shape Memory Effect) of Fe-(10∼16)%Mn-6%Si-9%Cr-5%Ni alloys was investigated. The corrosion behaviors of these alloys were also investigated compared with SUS 304 stainless steel and Fe-30%Mn-6%Si shape memory alloy. Through the investigation the Fe-2%Mn-6%Si-9%Cr-5%Ni alloy showed the best SME in as-solution treated state. Training treatment consisting of repetition of cold rolling by 2% at room temperature and subsequent annealing at 650℃ for 10 minutes was performed to improve the SME. The remarkable improvement of SME was obtained at two cycles of training, and then the SME was decreased with further training. This suggests that the extra lattice defects of dislocation and stacking faults introduced by training treatment deteriorates the SME. The Fe-X%Mn-6%Si-9%Cr-5%Ni alloys showed the passive behavior similar to that of SUS 304 stainless steel in 30℃-5% H₂SO₄solution and great improvement in corrosion resistance compared with the Fe-30%Mn-6%Si shape memory alloy.
흉부외상 없이 발생한 흉부대동맥 절단증의 조기 진단 : 2례 보고 Two Cases Report
한승백,전영진,백광제,김준식,김정택,김광호,선경 大韓應急醫學會 1998 대한응급의학회지 Vol.9 No.4
Aortic transection or interruption is a rare condition which developed after an acute deceleration injury. Its occurrence depends on the location and direction of the force applied and is usually from motor vehicle accident or falling down. The exact incidence of aortic transection in trauma is not known but, when develops, only about 10-15% of the victims can survive and be transported to the hospital. Even in the survivors, majority of them will be fatal within a few days if a prompt diagnosis and surgical treatments are not made. Aggressive diagnostic work-up is recommended for the patients with high suspicious index, which would salvage the victims with this fatal condition. We report the experience of two cases of aortic transection or interruption following motor vehicle accidents.
허혈 조건부여가 심근기능의 회복에 미치는 영향 : 적출 심장모델을 이용한 실험연구 Isolated heart experimental study
백광제,김준식,한승백,전영진,이인성 大韓應急醫學會 1999 대한응급의학회지 Vol.10 No.2
Background: Brief episode of coronary artery occlusion(i.e.,ischemic preconditioning) makes the heart more resistant to injury from a subsequent ischemic insult. Although a great deal of effort has been made in studying ischemic preconditioning, the underlying mechanism of ischemic preconditioning and its effect on hypothermic insult has not been elucidated. This study was performed to see whether ischemic preconditioning protects against the depression of cardiac contractility induced by hypothermic cardioplegic arrest/reperfusion. And recently, adenosine was known to have some correlation with the mechanism of preconditioning. If so, does this effect remain after the blockade of adenosine receptor by 8-phenyl theophyline? Method: Twenty-four Sprague-Dawley rat weighed 250-350g were used and divided into three groups. Rat hearts were removed rapidly, and each isolated heart paced with a rate of 180/min was perfused by modified Krebs-Hensleit buffer(KHB) solution on a Langendorff apparatus for an hour. After obtaining baseline data including left ventricular pressure(LVP), dp/dt, and coronary flow, cardiac arrest was induced by perfusion of 0℃ crystalloid cardioplegic(St Thomas) solution. After that, all hearts were stored in the same St Thomas solution at same temperature for 2 hours. In group Ⅰ(control group), the heart was reperfused by KHB solution. In group Ⅱ(preconditioning group), the heart was subjected to two 2-minute episode of global ischemia followed by 5 minute reperfusion with KHB solution(preconditioning) before cardiac arrest. In group Ⅲ(phenyl theophylline group), the heart was subjected to preconditioning procedure and 8-phenyl theophylline at 10μM in concentration was added to KHB solution at time of reperfusion. Observing parameter was obtained in each group at 10, 20, 40 and 60 minutes after starting reperfusion and compared statistically by use of one way ANOVA test(STASTICA, release 4.5). p-value less than 0.05 was considered significant. Results: Although depressed LVP, dp/dt, and coronary flow were seen in all groups during the reperfusion period, the preconditioned group showed more effective recovery of LVP than that of the control group, especially at 10, 20 and 40 minutes(p<.05). We failed to demonstrate the difference between the phenyl theophylline group and the control group(p=NS). Conclusion: These results suggest that ischemic preconditioning has protective effect on recovery state of hypothemic cardioplegic arrest/reperfusion. Its protective effect was limited during early reperfusion stage and was blocked by adenosine blocker.
SUPEROXIDE DISMUTASE 가 허혈 손상된 백서 근육 조직에 미치는 영향
민대홍,김승홍,백무현,김승한 大韓成形外科學會 1991 Archives of Plastic Surgery Vol.18 No.4
Superoxide radicals have been shown to play an important role in the cellular injury of reperfused ischemic tissue. We examined the protective effect of superoxide dismutase(SOD), one of the derivatives of superoxide rradical scavengers, on the reperfusion injury of replanted rat limb with 6 - hour is - chemic period. Biochemically, the amounts of superoxide radicals in ischemic hindlimbs treated with SOD have decreased significantly compared to those of control group.(p<0.01) Histologically, SOD treated extremities demonstrated less inflammatory reaction and degenerative change than control group. Our results indicate that the administration of SOD to a amputation part by means of intraarterial perfusion after prolonged period of warm ischemia significantly decreases the tissue damage.
김아진,김준식,신동운,백광제,한승백,이용주 대한응급의학회 2000 대한응급의학회지 Vol.11 No.3
Traditionally, the Rhododendron species has been used in gastrointestinal disorder or hypertension. Grayanotoxin exists in honey, flowers, pollen, and the nectar of the Rhododenron species. We experienced 3 cases of Grayanotoxin intoxication. The symptoms of intoxication were nausea, vomiting, hypotension, bradycardia, diplopia, dizziness, and chest discomfort. Generally, the treatment for Grayanotoxin intoxication is fluid resuscitation and injection of atropine sulfate. The patients who were intoxicated with Grayanotoxin were discharged without complication after supportive care.
다구치법에 의한 고 규소 내산주철의 용해주조공정 최적화
신제식,이상목,문병문,김정철,한동운,백승한 대한금속재료학회 2005 대한금속·재료학회지 Vol.43 No.2
In this study, Taguchi method, one of the design tools of experiments, was applied to optimize casting process parameters of the high silicon corrosion-resistant iron. Three casting process parameters such as melting temperature, rare earth metal (mischmetal) addition, and pouring temperature were chosen. Using SN (signal-to-noise) ratio calculated from ultimate tensile strength of each experimental casting run, the relationship between the casting parameters and mechanical properties was statistically evaluated. The casting condition of a melting temperature of 1,650℃, 0.2% rare earth metal addition, and a pouring temperature of 1,350℃ led to an excellent ultimate tensile strength above 11 kgf/mm², which is beyond the industrial criterion. The effects of the casting parameters on mechanical properties and corrosion resistance were further confirmed by combined analysis of fractography, hydrogen content determination, microscopic test, and acid resistance test. (Received August 23, 2004)
( Seung Baik Han ),( Areum Durey ),( Seung Jae Lee ),( Young Ho Seo ),( Ji Hye Kim ) 대한응급의학회 2018 대한응급의학회지 Vol.29 No.5
Cases of repeated acute gastric dilatations after binge eating in one patient are rarely reported. We report here a case of repeated acute gastric dilatations in a 22-year-old woman with bulimia nervosa. Her repeated acute gastric dilatations seem to have been related to superior mesenteric artery syndrome. On her last visit due to acute gastric dilatation, she underwent emergency gastric decompression surgery because of abdominal compartment syndrome; however, she eventually died because of ischemia reperfusion injury. Emergency physicians should be aware of the need to manage acute gastric dilatation in patients with eating disorder and should pay attention to the signs and distinctive clinical features of abdominal compartment syndrome.
흉부외상없이 발생한 흉부대동맥 절단중의 조기진단 2례 보고
한승백(Seung Baik Han),전영진(Young Jin Cheon),백광제(Kwang Je Baek),김준식(Jun Sig Kim),김정택(Jung Taek Kim),김광호(Kwang Ho Kim),선경(Kyoung Sun) 대한응급의학회 1998 대한응급의학회지 Vol.9 No.4
Aortic transection or interruption is a rare condition which developed after an acute deceleration injury Its occurrence depends on the location and direction of the force applied and is usually fiom motor vehide accident or falling down The exact incidence of aortic transection in trauma is not known but, when, only about 10-15 % of the victims can survive and be transported to the hospital Even in the survivors, majority of them will be fatal within a few days if a prompt diagnosis and surgical treatments are not made. Aggressive diagnostic work-up is recommended for the patients with high suspicious index, which would salvage the victims with this fatal condition We report the experience of two cases of aortic transection or interruptian following motor vehide acddents.