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GIS기법을 이용한 송전탑의 최적위치 선정에 관한 연구
이호남,김감래 明知大學校 産業技術硏究所 1996 産業技術硏究所論文集 Vol.15 No.-
The purpose of this study is to propose an application of Geographic Information System(GIS) as a computer system in order to reasonably find the optimal sites in power transmission towers. To analyze suitability site a network analysis model is applied with various spatial analysis function of GIS using base maps, thematic maps, and spatial attribute data based on data types and characteristics.
문철웅,정종훈,박천국,이승일,배학연,장경식,김만우,정춘해,홍순표,이병래,김호중 朝鮮大學校 附設 醫學硏究所 1993 The Medical Journal of Chosun University Vol.18 No.1
Renal ischemia is one of the most common causes of acute renal failure. Four factors related to the pathogenesis of acute renal failure are vasoconstriction, decreased glomerular filtration rate, tubular back leak of filtrate, and intratubular obstruction. The cellular response to renal ischemic insults include decreased content of adenosine trihosphate, lipid peroxidation induced membrane degradation, alteration in cellular pH, and calcium or phospholipase induced mitochondrial dysfunction. Much attention has been given to the role of increased cellular calcium as a pathogenetic contributor to cell injury during ischemia. Author studied the protective effects of calcium antagonists on cellular injury during renal ischemia in rat. To investigate the protective role of these agents, author measured the amount of malondialdehyde(MDA) and the enzyme activities of free radical scarvengers-superoxide dismutase(SOD), catalase and glutathione peroxidase from non-pretreated group and calcium antagonists pretreated groups in control, ischemia and reflow subgroups. The results were summerized as follows: 1) The amount of MDA in non-pretreated group was higher in the reflow compared with the control(<p<0.01). But, in all pretreated groups, there was no statistically difference in the amount of MDA. 2) The SOD activity in non-pretreated group was lower in both the ischemia and the reflow compared with the control (P<0.05). But, in both verapamil and trifluoperazine-pretreated groups, there was no statistically difference in the SOD activity. 3) Both catalase and glutathione peroxidase activities in non-pretreated group were lower in both the ischemia and the reflow compared with the control (P<0.05). But in all pretreated groups, there was no statically difference in both catalase and glutathione peroxidase activities. These results suggest that free radical mediated ischemic injury by renal artery clamp in rat can be protected by intraperitoneal pretreatment with calcium antagonists. As trifluoperazine has a protective effect in renal ischemia, the calcium activated calmodulin dependent enzyme may play a role in renal ischemic injury.
Lee, Hoing Lae,Kwon, O Hwan,Ha, Sung Min,Kim, Byoung Gak,Kim, Yong Seok,Won, Jong Chan,Kim, Jooheon,Choi, Jong Han,Yoo, Youngjae The Royal Society of Chemistry 2014 Physical chemistry chemical physics Vol.16 No.37
<P>In this study, we investigated the thermal conductivities and mechanical properties of polyetherimide (PEI) composites using polyimide (PI)-coated h-BN (PI-BN) particles. We found that PI-coated h-BN effectively increased adhesion with the PEI matrix, imparting enhanced mechanical and thermal stability and thermal conductivity with increasing BN content. The thermal conductivity of the PEI composite containing 60 wt% PI-BN was 3.3 W m<SUP>−1</SUP> K<SUP>−1</SUP>, while the thermal conductivity of the PEI/BN composite without modification was 2.6 W m<SUP>−1</SUP> K<SUP>−1</SUP>. The PEI/PI–BN composites show higher impact strengths than the PEI/BN composites because of less BN particle agglomeration and good wettability between PEI and h-BN. The results indicate that the PI-coated BN incorporated into the PEI matrix effectively enhances the thermal conductivity and mechanical properties of the PEI composites.</P> <P>Graphic Abstract</P><P>Enhanced thermal conductivities of PEI/(PI–BN) composites and their thermographic images. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp02730b'> </P>
이대희,이동호,송인성,정현채,정운태,최규완,김우호,이준행,김정룡,윤정환,임영석,이국래,김병관,황진혁,정준오 대한소화기내시경학회 1996 Clinical Endoscopy Vol.16 No.6
The endoscopic mucosal resection(EMR) is proposed by some Japanese investigators as a curative therapy of early gastric cancer(EGC) because of its minimal invasiveness and excellent results. To evaluate the possible role of EMR as a curative treatment modality of EGC, we retrospectively analyzed l9 casea with EGC initially treated by EMR in Seoul National University Hospital from December 1993 and January 1996. 1) The histologic diagnosis prior to EMR was adenocarcinoma in 12 cases(63%) and adenomatous polyp in 7 cases(38%), which were confirmed as adenocarcinoma after EMR. 2) The histologic curative resection was done in 7 cases(37%). Two cases of them showed recurrence of the gastric cancer and were treated by radical surgery. The other five cases have been closely observed by regular endoscopic examination without recurrence for the maximal period of 1~3 months. 3) Histoiogically inadequate resection(positive cancer cell in resection margin, submucosal cancer infiltration, or no cancer tissue in resected specimen) was done in 12 cases(73%). But two surgically resected cimens of them have no residual cancer cells, and there was no cancer cells in the follow-up biopsy of the other two patients. There 4 cases were seemed to he examples of buring effect of EMR. 4) After excluding five depressed lesions greater than 1 cm is long diameter, nine lesions were curatively treated by EMR. So successful EMR rate for strictly indicated lesions wsa 64%. 5) There was no signifieant complication related to the procedure. We thnnk that endoscopic mucosal resection has a potential role as a curative treatment modality in a highly selected patient with darly gastric cancer.
(Jae Ho Lee),(Dong Ho Lee),(Joo Hee Zo),(Tae Ho Kim),(Kook Lae Lee),(Hee Soon Chung),(Cheol Ho Kim),(Sung Ku Han),(Young Soo Sim),(Hyo Suk Lee),(Yong Bum Yoon),(In Sung Song),(Chung Yong Kim) 대한내과학회 2001 The Korean Journal of Internal Medicine Vol.16 No.2
N/A Background : Hepatopulmonary syndrome (HPS) refers to the association of hypoxemia, intrapulmonary shunting and chronic liver disease. But there is no clear data about the prevalence of HPS in postnecrotic liver cirrhosis by hepatitis B virus(HBV), the most common cause of liver disease in Korea. The aim of this study was to investigate the prevalence of HPS in poorly compensated postnecrotic liver cirrhosis by HBV, and the correlation of the hepatopulmonary syndrome with clinical aspects of postnecrotic liver cirrhosis by HBV. Methods : Thirty-five patients underwent pulmonary function test, arterial blood gas analysis and contrast-enhanced echocadiography. All patients were diagnosed as HBV-induced Child class C liver cirrhosis and had no evidence of intrinsic cardiopulmonary disease. Results : Intrapulmonary shunt was detected in 6/35 (17.1%) by contrast- enhanced echocariography. Two of six patients with intrahepatic shunts had significant hypoxemia (PaO2 < 70 mmHg) and four showed increased alveolar- arterial oxygen gradient over 20 mmHg. Only cyanosis could reliably distinguish between shunt positive and negative patients. Conclusions : The prevalence of intrapulmonary shunt in poorly compensated postnecrotic liver cirrhosis by HBV was 17.1% and the frequency of hepatopulmonary syndrome was relatively low (5.7%). ‘Subclinical’ hepatopulmonary syndrome (echocardiographically postive intrapulmonary shunt but without profound hypoxemia) exists in 11.4% of cases with poorly compensated postnecrotic liver cirrhosis by HBV. Cyanosis is the only reliable clinical indicator of HPS of HBV- induced poorly compensated liver cirrhosis. Further studies are required to determine if the prevalence and clinical manifestations of HPS varies with etiology or with geographical and racial differences.
췌장가성낭에 대한 내시경적 배액술과 방사선학적 경피적 배액술의 치료 효과 비교
김태호,김경아,이동호,김용태,송호준,이국래,윤용범,류지곤,장유현,김정룡,이광혁,김강모,문해,이우진 대한소화기학회 1999 대한소화기학회지 Vol.34 No.4
Background/Aims: Surgical, percutaneous, and endoscopic techniques are used as drainage method for symptomatic and complicated pancreatic pseudocysts. However, there has been no study to compare the effect and complications of the endoscopic and percutaneous drainage methods. The aim of this study was to compare the effectiveness and side effects of these two nonsurgical techniques. Methods: We retrospectively examined the records of 25 patients who had undergone percutaneous or endoscopic drainage for pancreatic pseudocysts from 1995 to 1998. Results: Eleven patients were managed with endoscopic drainage (ED) and fourteen patients were managed with percutaneous drainage (PCD). There was no significant difference between ED group and PCD group in respect to success rate of first trials (9/11 and 14/14, respectively; p=0.183), rate of pain relief (3/5 and 4/6; p=1.00), hospital days (27.3±18.4 and 24.7±26.0 days; p=0.307), rate of conversion to surgical drainage (0/11 and 4/14; p=0.105), and complications (34 and 6/11; p=0.115). Moreover, no difference was detected in the rate of patients in whom removal of drainage tube was possible (7/10 and 9/10; p=0.370) or in the duration of drainage (109±47 and 137±116 days; p=0.874). Conclusions: There is no difference in effectiveness and side effect between endoscopic and percutaneous methods for draining pancreatic pseudocysts. The two methods can be used complementarily.