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정승부 成均館大學校 科學技術硏究所 1996 論文集 Vol.47 No.2
Reaction diffusion and formation of Ni_3AL phase with L1_2 structure has been studied at temperature from 1423 to 1573K using the diffusion couple of (Ni-40.5at%Al)/(Ni-15at%Al) and (Ni-49.2at%Al)/(Nickel). The layer growth of Ni_3-Al phase in the annealed diffusion couple was measured by optical microscope and electron probe microanalyzer(EPMA). The layer growth of Ni_3Al phase in this experimental temperature range was controlled by the volume diffusion mechanism. The rate of layer growth of Ni_3-Al phase was found to be closely related to the composition of NiAl phase. The activation energy for layer growth of Ni_3Al phase was calculated to be 127kJ/mol.
양승부,최교창,이상진,정영진,임한혁,한효상,황인철,조환성 순천향의학연구소 2005 Journal of Soonchunhyang Medical Science Vol.11 No.1
Objective : Our purpose of this study is to evaluate the effectiveness of the transcatheter arterial embolization for the management of abnormal uterine bleeding. Materials and Methods : 14 patients with massive or recurrent uterine bleeding underwent percutaneous transcatheter arterial embolization between February 2003 and September 2004. We reviewed 14 cases of uterine artery or internal iliac artery embolization using gelfoam or PVA particles. Results : Good management of uterine bleeding was achieved in 13 of 14(93%) cases. The cause of abnormal uterine bleeding was myoma(5 case), post D & E bleeding(3), acquired vascular malformation(3), pseudoaneurysm(1), adenomyosis(1), and endometrial hyperplasia(1). Conclusion : Transcatheter artery embolization is an effective and life-saving procedure in massive or recurrent uterine bleeding. Early diagnosis and prompt transcatheter arterial embolization is a useful mangement of uterine bleeding.
설재훈,정영호,장종승,임영도,최부귀 東亞大學校 附設 情報通信硏究所 1998 情報通信硏究所論文誌 Vol.6 No.1
In this paper, we apply the controller output error method to the adaptive fuzzy control design. This method employs a gradient descent algorithm to minimize a error function which is beased on the error at the controller output. This contrasts with more conventional methods which use the error at the plant output. The error function is minimized by adapting some or allof the parameters of the fuzzy controller. In this paper, we propose to revise the consequent parameter. The proposed adaptive fuzzy controller is applied to the adaptive control of a nonlinear plant and is shown to be capable of providing good overall system performance.
다꾸지법을 이용한 구리와 타이타늄 마찰압접부의 용접변수의 영향에 관한 연구
金成演,延倫模,鄭承富,徐昌濟 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.7
This paper describes a fundamental investigation of the friction welding condition for the pure copper/ pure titanium joining and the effect of friction time, upset pressure on the mechanical and metallurgical properties of the joint. Taguchi method has been adopted for investigating the contribution of welding variables. Under a constant upset pressure, the tensile strength have a little difference with an increase in friction time. At a constant friction time, the tensile strength increased with an increase in the upset pressure. The tensile fracture of Cu to Ti joint occurred at the Cu base material near the interface.
Gemcitabine을 사용한 폐암환자에서 발생한 용혈성 요독증후군 1예
박윤정 ( Youn Jung Park ),양근석 ( Keun Suk Yang ),정홍순 ( Hong Soon Jung ),남희철 ( Hee Chul Nam ),정승혜 ( Seung Hye Jung ),김부경 ( Boo Gyoung Kim ),김가영 ( Ka Young Kim ),김정호 ( Jung Ho Kim ),김영옥 ( Young Ok Kim ),윤유선 대한결핵 및 호흡기학회 2012 Tuberculosis and Respiratory Diseases Vol.72 No.2
Hemolytic uremic syndrome (HUS) is a rare disorder characterized by the triad of microangiopathic hemolytic anemia, thrombocytopenia, and acute renal failure. HUS arises from a wide spectrum of conditions, and chemotherapeutic agents have been reported to be associated with HUS, including Mitomycin, Cisplatin, Bleomycin, and Gemcitabine. A 76-year-old man treated with Gemcitabine due to non-small cell lung cancer developed clinical and laboratory findings compatible with HUS. Gemcitabine was ceased and hemodialysis and plasma exchange were utilized and he recovered. A high level of suspicion for HUS is necessary when cancer patients are treated with Gemcitabine, and prompt recognition and treatment are also essential.
Chang, Hee Jung,Yoon, Goo,Park, Jung Sun,Kim, Mi Ha,Baek, Min Kyung,Kim, Nam Ho,Shin, Boo Ahn,Ahn, Bong Whan,Cheon, Seung Hoon,Jung, Young Do Pharmaceutical Society of Japan 2007 Biological & pharmaceutical bulletin Vol.30 No.12
<P>Licochalcones have a variety of biological properties including anti-tumor, anti-parasitic and anti-bacterial activities. Recently, a new retrochalcone (licochalcone E, Lico-E) was isolated from the roots of <I>Glycyrrhiza inflata</I> (<I>Chem. Pharm. Bull.</I>, 53, 2005, Yoon <I>et al.</I>) by cytotoxicity-guided fractionation. This study examined whether or not Lico-E-induced endothelial cell death occurs through apoptosis, and investigated molecular mechanisms involved in this process. Lico-E was found to suppress ECV304 cell growth and induce apoptosis. The induction of apoptosis by Lico-E was confirmed by the ladder-patterned DNA fragmentation, the presence of cleaved and condensed nuclear chromatin and the increased number of annexin V-positive cells. Lico-E could effectively inhibit the constitutive NF-κB activation, as revealed by the electrophoretic mobility shift assay and NF-κB-dependent luciferase reporter study. In addition, the Lico-E treatment caused a change in the Bax/Bcl-2 ratio that favored apoptosis. These results suggest that Lico-E induces endothelial cell apoptosis by modulating NF-κB and the Bcl-2 family.</P>
( Boo Sung Kim ),( Youn Zoo Cho ),( Soon Koo Baik ),( Moon Young Kim ),( Won Ki Hong ),( Hye Won Hwang ),( Jin Hyung Lee ),( Myeong Hun Chae ),( Seung Yong Shin ),( Jung Min Kim ),( Mee Yon Cho ),( Sa 대한간학회 2013 춘·추계 학술대회 (KASL) Vol.2013 No.1
Background: Cirrhosis is a long-term consequence of chronic hepatic injury with fibrosis and no effective therapy except liver transplantation is currently available for decompensated cirrhosis. However, some practical limitations in liver transplantation lead us to a need for new therapeutic paradigm in this field. Recent reports have shown that the mesenchymal stem cells (MSCs) have the plasticity to differentiate into some kinds of tissue cells and improve organ function. Hence, we investigated the effect of direct inoculation of human bone marrow derived MSCs (BM-MSCs) in thioacetamide (TAA)-induced cirrhosis in a rat model. Methods: Adult Sprague-Dawley rats were allocated into three groups (each group, n = 15) as follows: G1, shame; G2, TAAcontrol; G3, TAA+BM-MSC. To induce cirrhosis, 200mg/kg TAA injection was done twice a week for 12weeks in G2 and G3. 2×106 cells of amplified human BM-MSCs were injected directly into the right liver lobe twice, at weeks 6 and 8 in G3. At 12 weeks, the effect of BM-MSCs on cirrhosis was analyzed histomorphologically using Laennec scores. α-Smooth muscle actin(α-SMA) expression by immunohistochemical staining, relative expression of collagen type 1, and transforming growth factor β (TGF-β) were also evaluated by real-time reverse transcriptase- polymerase chain reaction. Results: Laennec scores were 0, 5.4±0.7 and 3.7±1.06 in G1, G2 and G3, respectively. Histologically, BM-MSCs injected group (G3) showed significant suppression of hepatic fibrosis compared with TAA-control group (G2)(P<0.001). Expressions of α-SMA(%) were significantly lower in G3 than in G2 (3.08±1.26 vs. 7.00±4.12, P<0.05). Also, the relative expression of collagen type 1 and TGF-β1 in RT-PCR were 0.64±0.24, 2.06±0.51, 1.32±0.31 and 0.62±0.28, 5.89±3.05, 2.22±1.41 in G1, G2 and G3, respectively P<0.005). Conclusions: Our results showed that BM-MSCs could attenuate liver fibrosis in rats with TAA-induced cirrhosis, raising the possibility for clinical use of BM-MSCs in the treatment of cirrhosis.