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정철현,박현주,정일현,나춘기,Jung, Chul-Hyun,Park, Hyun-Ju,Chung, Il-Hyun,Na, Choon-Ki 대한자원환경지질학회 2007 자원환경지질 Vol.40 No.4
고성군에 위치한 폐구리광산의 중금속 오염범위와 정도 및 환경위해성을 평가하기 위하여 광산지역으로부터 토양과 벼를 채취하여 중금속 함량을 분석하였다. 중금속 함량은 논토양에 비해 산토양에서 훨씬 높았다. 중금속 전함량은 산토양에서 Cu>Zn>Pb>As>Cr>Cd, 논토양에서 Zn>Pb>Cu>Cr>As>Cd 순으로 감소하였으며, 0.1/1N HCl에 의한 중금속 용출량은 산토양에서 Cu>Pb>Zn>As>Cd>Cr, 논토양에서 Pb>Cu>Zn>As>Cd>Cr 순으로 나타났다. 중금속 용출비는 시료채취지점에 따라 매우 다양하였지만 평균적으로는 Cd(16%)>Pb(10%)>Cu(9%)>As(4.5%)>Zn-Cr(${\le}2.5%$)의 순이었다. 조사대상 토양들은 지각평균값에 비해 중금속이 부화되어 있으며 그 순서는 $As{\ge}Cd>Pb>Zn>Cu>Cr$이었다. 토양의 중금속 전함량 또는 용출량으로부터 계산한 오염지수는 중금속 오염이 폐구리광산 특히 삼산제일광산 주변의 산토양에 국한되어 있음을 나타내었다. 현미 중의 중금속함량은 As $nd{\sim}0.87mg/kg,\;Cd\;0.02{\sim}0.34mg/kg,\;Cu\;1.01{\sim}6.25mg/kg,\;Mn\;13.4{\sim}43.2mg/kg,\;Pb\;0.09{\sim}2.83mg/kg$ 및 $Zn\;16.5{\sim}79.1mg/kg$으로 심각하게 오염된 수준은 아니었다. 토양 pH와 함께 중금속의 용출 및 분포특성들은 이 지역 중금속 오염의 대부분이 중금속의 용해 순환보다는 폐광석과 맥석광물의 쇄설성 이동에 의해 진행되고 있음을 시사하였다. In order to evaluate the degree and extent of heavy metal pollution and the environmental impacts of abandoned Cu mines in Goseong-gun, soils and paddies were collected from the mine area and have been analysed for heavy metal contents. The heavy metal contents were much higher in mountain soils than in paddy soils. Total content of heavy metals decreased in order of Cu>Zn>Pb>As>Cr>Cd in mountain soils whereas Zn>Pb>Cu>Cr>As>Cd in paddy soils. The extractable amount of heavy metals by 0.1/1N HCl decreased in order of Cu>Pb>Zn>As>Cd>Cr in mountain soils whereas Pb>Cu>Zn>As>Cd>Cr in paddy soils. Although the extraction ratios were highly various depending on the sampling site, their average values were in order of Cd(16%)>Pb(10%)>Cu(9%)>As(4.5%)>Zn-Cr(${\le}2.5%$). The soils investigated were enriched in heavy metals relative to the averages of earth crust as In order of $As{\ge}Cd$>Pb>Zn>Cu>Cr. Pollution index calculated from total or extractable heavy metals of soils indicated that the heavy metal pollution was restricted to mountain soils around abandoned Cu mines, especially the Samsan I mine. The metal contents of brown rice showed no significantly contaminated level as follows; As $nd{\sim}0.87mg/kg,\;Cd\;0.02{\sim}0.34mg/kg,\;Cu\;1.01{\sim}6.25mg/kg,\;Mn\;13.4{\sim}43.2mg/kg,\;Pb\;0.09{\sim}2.83mg/kg,\;and\;Zn\;16.5{\sim}79.1mg/kg$. From the extraction and dispersion properties of heavy metal with the soil pH ($4.5{\sim}7.8$), it can be deduced the conclusion that the heavy metal pollution is spreading in the study area mainly by the detrital migration of waste ore and gangue minerals rather than the dissolution and circulation of heavy metal.
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나찬영,이영탁,김웅한,정철현,정윤섭,방정현,김욱성,이섭,한재진,정도현,정일상,박중원,박영관,홍승록,문현수,Na, Chan-Young,Lee, Young-Tak,Kim, Woong-Han,Chung, Chul-Hyun,Jung, Yoon-Seop,Bang, Jeong-Hyin,Kim, Wook-Seong,Lee, Sub,Han, Jae-Jin,Chung, D 대한흉부심장혈관외과학회 1996 Journal of Chest Surgery (J Chest Surg) Vol.29 No.11
관상동맥우회술은 인공심폐기 및 심근보호의 안정성으로 인공심폐기사용하에 시행하는 것이 보편화된방법이다. 그러나, 좌전행지 및 우관상동맥에 병소가 위치하는 경우는 인공심폐기의 사용없이 심장이 박동하는 상태에서 관상동맥우회술을 시행하는 방법도 일부에서 시행되어왔다 저자들은 좌전행지 및 대각지에 협착을보인 환자에서 인공심폐기를 사용하지 않고 성공적으로 관상동맥우회술을 시행하였기에 보고하는 바이다. Coronary artery bypass grafting without cardiopulmonary bypass is now one of accepted technique of myocardial revascularization. This technique is an alternative method for patients with lesions in the left anterior descending coronary artery and right coronary artery. We report a case of coronary artery bypass grafting without cardiopulmonary bypass or cardiac arrest.
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이동락,정철훈,오석준,정철현 大韓成形外科學會 1990 Archives of Plastic Surgery Vol.17 No.3
For complete release from severe contracture of the first web space of the hand, suitable skin must be proviede. The skin graft is occasionally not helpful because of contracture recurrence. The local flap is often insufficient and unable to fill the space after release. The distant flap is frequently bulky, requires a second operation for division and frequently demands further procedures for revisions. A dorsalis pedis free flap precisely tailored allows unparalleled correction to be achieved with one surgical intervention. We have performed 6 cases of operation. It matched the dorsal skin of the hand in color, texture and thickness. Release, soft tissue reconstruction, bone graft and tendon graft can be completed in a single operative stage. The average abduction distance which was measured between base of the middle finger and mid point of the interphalangeal joint of the thumb, was increased to 7cm after operation compared with 2.9cm before operation.
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장지민,허재학,정철현 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.5
Cver the years, there have been continuous improvements and modifications in operating technique and the developments of the new devices to aid the surgeon in the field of coronary arterial bypass surgery. And those improvements have lead cardiac surgeons to the off-pump coronary arterial bypass surgery(OPCAB) - surgery without cardiopulmonary bypass including cardioplegia. Nowadays, revascularization surgery of multiple coronary arteries without cardiopulmonary bypass is becoming a routine procedure in the technical arsenal of the modern cardiac surgeon. The key requirements of the successful OPCAB are good exposure and stabilization of all target vessels while minimal hemodynamic compromises ensue. Current data shows appreciable postoperative outcome for OPCAB. Furthermore, it has numerous benefits for the subset of patients traditionally considered to be high-risk for CABG.
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