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이용범,황용식,이창희,박명희,이채관,강동묵,김정원,전병일,문덕환 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.1
■ Objectives The purpose of this study was to estimate qualitatively various bulk deposition flux of insoluble heavy metal components by applying regional and seasonal distribution. our institution from January 1980 to December 31th, 2001. ■ Materials and Methods Dustfall particles were collected by the modified American dust jar (wide inlet bottle type) at 6 sampling sites in Pusan area from March, 1999 to February, 2000. Five chemical species (Cd, Cr, Mn, Ni and Pb) were analyzed by AAS(Perkin-Elmer 4100ZL). ■ Results The mean values of each heavy metal concentrations were Cd for 3.947 g/㎢/month, Cr for 0.191 ㎏/㎢/month, Mn for 0.375 ㎏/㎢/month, Ni for 0.176 ㎏/㎢/month, and Pb for 0.823 ㎏/㎢/month. ■ Conclusions Insoluble heavy metal amount of regional variations were found in order of industrial zone, coastal zone, commercial zone, agricultural zone and residential zone.
Channel Defect Analysis Method of a-IGZO TFTs on Polyimide for Flexible Displays
Hyojung Kim,Bo-Hyeon Jeon,Jong Woo Park,June-Hwan Kim,Soon-Kon Kim,Min-Jun Song,Pyung-Ho Choi,Jung-Min Park,Ki-Hwan Kim,Jang-Kun Song,Byoung-Deog Choi 대한전자공학회 2020 Journal of semiconductor technology and science Vol.20 No.5
In this paper, we introduce a method enabling faster and more innovative analysis of the channel characteristics of amorphous indium-gallium-zinc oxide (a-IGZO) thin film transistors (TFTs) manufactured on flexible substrates through electrical property analysis. The TFTs used in the present evaluation were a-IGZO TFTs with different oxygen flow rates (OFRs), which have been reported on frequently in the past, to confirm the effectiveness of the new evaluation method. The interface characteristics of the IGZO and the insulator were confirmed by density of state (DOS) extraction using photoexcited charge collection spectroscopy (PECCS). Defects of the TFT active layer were confirmed through the capacitance-time (c-t) method. It was confirmed that the smaller the OFR, the smaller the carrier lifetime due to the presence of oxygen vacancies. In conclusion, by obtaining the same results as previously reported physical analyses, the proposed electrical channel characteristics analysis of IGZO TFTs was shown to be a reliable analysis method.
길준영 ( Gil Jun Yeong ),전의건 ( Jeon Ui Geon ),윤환중 ( Yun Hwan Jung ),김백수 ( Kim Baeg Su ),최용석 ( Choe Yong Seog ),조덕연 ( Jo Deog Yeon ),김삼용 ( Kim Sam Yong ) 대한내과학회 1993 대한내과학회지 Vol.44 No.3
Background : It is well konwn that aplastic anemia is more prevalent in the Far East than elsewhere in the world. There have been many suggestions that the clinical features of the patients with aplastic anemia in Korea would be somewhat different from that of western countries. Analysis of clinical data of 32 cases of aplastic anemia diagnosed at Chungnam National University Hospital from August 1985 to July 1991 was done. Methods : Initially all patients were treated with oxymetholone (50-100mg/d) with or without prednisolone (5-10mg/d) and supportive care. The patients who did not respond to androgen therapy were treated with antilymphocyte globulin (ALG) (20mg/kg/d for 4 days) plus methylprednisolne (methyl PD) (20mg/kg/d for 5 days). Analysis of reponse to therapy was done in 31 patients who could be followed for more than 3 months. Results : 12 patients (37.5%) were in their third decade and 25 cases of patients (78.2%) were below 40 years of age. The incidence decreased in older age groups. Exposure to possible toxic agents were seen in 6 cases (18.8%) ; benzene was counted in 2 cases (6.3%), herb drug in 2 cases (6.3%), antifungal agent in 1 case (3.1%). One case of aplastic anemia occured after acute viral hepatitis infection (type B) (3.1%), Eleven (35.5%) out of thity-one patients responded to androgen therapy (CR : 16.1%, PR : 19.4%). Nine out of the twenty patients who did not respond to androgen therapy were treated with ALG plus methyl PD. Two patients (22.2%) out of 9 showed complete responses. Overall response of present series of patients was 42% (oxymetholone±prednisolone therapy : 35.5%, ALG+methyl PD : 22.2%). By Kaplan-Meier product limit estimation, median survival time of 31cases was 36 months and the actuarial survival at 72 months was 83.1%. The median survival time of 31 cases was 36 months and the actuarial survival at 72 months was 83.1%. The median survival time of severe aplastic anemia (32 months) was similiar with that of moderately severe aplastic anemia (37 months). Factors associated with favourable survival were male sex and presence of etiological factor (p<0.05). Conclusions : In the present series, the survival rate of patients with aplastic anemia were somewhat different from that of western countries. Since the prognosis of patients with aplastic anemia in Korea is more favourable. A randomized controlled study would be needed to define the therapeutic role of bone marrow transplantation in patients with severe aplastic anemia in Korea.
Young Rok Do,Yunsuk Choi,Mi Hwa Heo,Jin Seok Kim,Jae-ho Yoon,Je-Hwan Lee,Joon Seong Park,Sang Kyun Sohn,Sung Hyun Kim,Sungnam Lim,정주섭,Deog-Yeon Jo,Hyeon Seok Eom,Hawk Kim,So Yeon Jeon,Jong-Ho Won,Hee 대한혈액학회 2022 Blood Research Vol.57 No.3
Background Gaucher disease (GD) is an autosomal recessive disorder characterized by excessive accumulation of glucosylceramide in multiple organs. This study was performed to determine the detection rate of GD in a selected patient population with unexplained splenomegaly in Korea. Methods This was a multicenter, observational study conducted at 18 sites in Korea between December 2016 and February 2020. Adult patients with unexplained splenomegaly were enrolled and tested for β-glucosidase enzyme activity on dried blood spots (DBS) and in peripheral blood leukocytes. Mutation analysis was performed if the test was positive or indeterminate for the enzyme assay. The primary endpoint was the percentage of patients with GD in patients with unexplained splenomegaly. Results A total of 352 patients were enrolled in this study (male patients, 199; mean age, 48.42 yr). Amongst them, 14.77% of patients had concomitant hepatomegaly. The most common sign related to GD was splenomegaly (100%), followed by thrombocytopenia (44.32%) and, anemia (40.91%). The β-glucosidase activity assay on DBS and peripheral leukocytes showed abnormal results in sixteen and six patients, respectively. Eight patients were tested for the mutation, seven of whom were negative and one patient showed a positive mutation analysis result. One female patient who presented with splenomegaly and thrombocytopenia was diagnosed with type 1 GD. The detection rate of GD was 0.2841% (exact 95% CI, 0.0072‒1.5726). Conclusion The detection rate of GD in probable high-risk patients in Korea was lower than expected. However, the role of hemato-oncologists is still important in the diagnosis of GD.