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- 저자 : ( Hyung Geun Park ) (검색결과 784 건)
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이상윤,라병욱,박동수,황인헌,이덕동,신영남,박성배,이동욱,박용석,박형근,손상호,권태근,채경락,정경득 慶北大學校 自然科學大學 1986 自然科學論文集 Vol.4 No.-
An Ac-type Plasma Display Panel (PDP) operating with Ne-Ar(0.1%) Penning mixture gas is fabicated. The characterics of the panel with electrodes covered with thin and thick dielectric layers are studied. The brightness of the Neon-orange light emitted by the panel measured as function of applied voltage and frequency. As an application, a graphic display system equipped with PDP showing still and moving pictures is made.
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Paraquat 투여 생쥐의 각 장기내 paraquat 농도 및 효소활성의 변화
박재윤,김근형 朝鮮大學校 附設 醫學硏究所 1993 The Medical Journal of Chosun University Vol.18 No.1
In this experiment, the level of paraquat and activities of acetycholinesterase, superoxide dismutase (SOD) and catalase were investigated in various organs of paraquat-treated mice. Paraquat level in various organs were markedly elevated after paraquat treatment, and the peak is reached within 2-4 hrs followed by a gradual decline to near normal levels by 24hrs. In lung, elevation of paraquat level is more predominant and persist for a prolonged period of time. But the paraquat was not detected in braine of paraquat treated mice. The activity of acetylcholinesterase in liver, lung and kidney of mice was significantly decreased by paraquat but unchaged in brain. The activities of SOD and catalase were significantly decreased in liver and lung of mice by paraquat administration. These result suggested that paraquat-induced organ toxicity were correlated with the level of paraquat in each organs, and paraquat would not be transfer the blood-brain barrier.
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Plasma arc light를 이용한 bracket 부착시의 전단결합강도와 파절양상의 유형
박영철,유형석,오영근,이승연 대한치과교정학회 2001 대한치과교정학회지 Vol.31 No.2
본 연구의 목적은 bracket 부착시 광조사시간을 획기적으로 감소시킬 수 있는 plasma arc licht의 임상적 유용성을 visible light 중합시의 전단결합강도와 접착파절양상과 비교해 봄으로써 평가해 보는데 있다. 사람의 상하악 소구치를 포매하여 만든 레진블럭시편에 광중합 접착제인 TransbondR를 사용하여 수종의 bracket을 각각의 조건에 따라 부착한 후 만능 물성시험기를 이용하여 전단결합강도를 측정하고, 접착파절양상을 stereoscope을 이용하여 관찰하여 다음과 같은 결과를 얻었다. 1.Plasma arc light를 이용한 수종의 bracket 접착시 metal bracket과 ceramic bracket의 전단결합강도는 임상적으로 사용하기에 충분한 값을 나타내었으며, resin bracket의 경우 다른 bracket에 비해 전단결합강도가 현저히 작은 값을 나타내었지만 임상적으로 사용이 가능한 값을 나타내었다. 2.Visible light를 이용한 metal bracket의 광중합시 광조사시 간에 따른 전단결합강도는 광조사 시 간에 따른 유의 한 차이를 보이지 않았으며, 임상적으로 사용하기에 충분한 강도를 나타내었다. 3.Plasma arc light를 이용한 수종의 bracket 접착시 접착제 잔류지수를 통해 접착파절양상을 관찰한 결과, metal bracket과 resin bracket의 경우 bracket기저면에 접착제가 반 이상 남아 있지 않은 경우가 많았으며, ceramic bracket의 경우 bracket기저면에 접착제가 반 이상 남아 있는 경우가 많았다. 4.Metal bracket의 부착시 plasma arc light를 2초간 광조사한 군과 visible light를 10초간 광조사한 군의 전단결합강도와 접착파절양상을 비교시 유의한 차이를 보이지 않았다. 6.Plasma arc light를 이용한 광중합시 광조사 거리에 따른 전단결합강도는 거리가 증가할수록 감소하였다. 이상의 실험 결과는 plasma arc light를 이용한 bracket의 접착시 전단결합강도 저하의 우려 없이 임상적으로 사용 가능함을 시사한다. The puruose of this study was to evaluate the clinical usefulness of plasma arc light which can reduce the curing time dramatically compared by shear bond strengths and failure patters of the brackens bonded with visible light in direct bracket bonding. Some kinds of brackets were bonded with the TransbondR to the human premolars which were embedded in the resin blocks according to the various conditions. After bonding, the shear bond strength was tested by Instron universal testing machine and in addition , the amount of residual adhesive remaining on the tooth after debonding was measured by the stereoscope and assessed with adhesive remnant index(ARI). The results were as follows : 1.When plasma arc light was used for bonding the brackets, the shear bond strength was clinically sufficient in both metal and ceramic brackets, but resin brackets showed significantly lower bond strength but which was clinically useful. 2.When metal brackets were bonded using visible light, there was no significant difference in shear bond strength due to the light-curing time and the bond strength was clinically sufficient. 3.When the adhesive failure patterns of brackets bonded with plasma arc light were observed by using the adhesive remnant index, the bond failure of the metal and resin bracket occurred more frequently at bracket-adhesive interface but the failure of the ceramic bracket occurred more frequently at enamel-adhesive interface. 4.There was no statistically significant difference of the shear bond strength and adhesive failure pattern between metal bracket bonded for 2 seconds by curing with plasma arc light and 10 seconds by curing with visible light. 6.When metal brackets were bonded using plasma arc light, the shear bond strength decreased as the distance from the light source increased. The above results suggest that plasma arc light can be clinically useful for bonding the brackets without fear of the decrease of the shear bond strength.
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다량 토혈 후 발생한 뇌경색으로 인하여 간질증첩증을 보인 간성 뇌증 1예
오형근,정두신,이경복,양광익,박형국 순천향의학연구소 2007 Journal of Soonchunhyang Medical Science Vol.13 No.1
Status epilepticus (SE) has been described as a rare manifestation of hepatic encephalopathy. Massive bleeding and subsequent anemia may precipitate atherothrombotic cerebral infarction. Stroke is one of the possible causes of SE. A 69-year-o1d male with decompensated alcoholic liver cirrhosis presented with altered mental state and generalized convulsive SE after massive hematemesis due to varix bleeding. The hemoglobin level was 5.5 mg/dL and blood ammonia level was more than twice the normal level. The seizure was resolved after prompt and aggressive treatment for SE. The blood ammonia level was normalized after treatment for hepatic encephalopathy, but the patient' s mental state was not recovered. Brain MRI revealed multiple ischemic lesions in the both cerebral hemisphere. We present the patient as SE after acute ischemic stroke associated with anemia in hepatic encephalopathy.
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칼슘통로차단제로 호전을 보인 반복적인 일과성 한눈시각상실 1례
오형근,정두신,박형국,안무영 순천향의학연구소 2008 Journal of Soonchunhyang Medical Science Vol.14 No.1
Retinal migraine is a rare and poorly understood migraine varient. Vasospasm of the retinal or ophthalmic artery is thought to be the cause of the monocular visual disturbance. Reversible monocular visual phenomena and headache fulfilling criteria for migraine are essential for diagnosis. Some cases without headache have been reported, but their migrainous nature cannot be ascertained. We report a case of recurrent transient monocular blindness without accompanying headache improved by calcium channel blocker.
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