Ni_3Al상의 형성과 반응확산

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.

경도관 동맥색전술을 이용한 비정상 자궁출혈의 치료

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.

제어기 출력오차 방법을 이용한 적응 퍼지제어

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.

BGA패키지에서의 무연솔더 접합부 전단 시험법의 최적화

김종웅,문정훈,서창제,정승부 대한금속ᆞ재료학회 2006 대한금속·재료학회지 Vol.44 No.3

Induction of Apoptosis by the Licochalcone E in Endothelial Cells via Modulation of NF-кB and Bcl-2 Family

( Hee Jung Chang ),( Goo Yoon ),( Jung Sun Park ),( Mi Ha Kim ),( Min Kyung Baek ),( Nam Ho Kim ),( Boo Ahn Shin ),( Bong Whan Ahn ),( Seung Hoon Cheon ),( Young Do Jung ) 전남대학교 약품개발연구소 2007 약품개발연구지 Vol.16 No.-

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.

Induction of Apoptosis by the Licochalcone E in Endothelial Cells <i>via</i> Modulation of NF-κB and Bcl-2 Family

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>

Fabrication of Ag circuit embedded in PDMS substrate and its mechanical and electrical property with variations of photonic energy

Jung, Kwang-Ho,Kim, Jungsoo,Park, Bum-Geun,Lee, Choong-Jae,Sung, Hwan-Jin,Jung, Seung-Boo Elsevier 2018 Journal of Alloys and Compounds Vol.748 No.-

<P><B>Abstract</B></P> <P>Ag circuit embedded in polydimethylsiloxane (PDMS) substrate were fabricated through photonic sintering and transfer of Ag nanoparticles (NPs) for reducing processing time, cost, damage to the substrate, and delamination caused by the low surface energy of PDMS. The photonic energy led to the microstructural evolution of a printed Ag circuit by rapid cluster formation and by removing the organics within several microseconds. Variations of surface roughness showed increasing trends at higher photonic energy conditions and drastic decrease after the embedding process. Hardness and electrical resistivity were measured before and after PDMS embedding, and after the second photonic sintering at various photonic energy conditions. The Ag circuit embedded in the PDMS substrate showed improved hardness by 207% due to the denser microstructure of the flipped surface and increased electrical resistivity increasing by 54% on average. Moreover, the effects of second sintering on the microstructure, electrical, and mechanical properties and the electrochemical reliability of the embedded Ag circuit are also studied.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Embedding of metal nanoparticles in PDMS substrate was devised. </LI> <LI> Ag nanoparticles were sintered at various photonic energy conditions and they show the microstructural evolution. </LI> <LI> Increased electrical conductivity and ECM lifetime of Ag circuit with increasing photonic energy were identified. </LI> </UL> </P>

Myanmar Parents’ Views on Home Math Environment in Three Countries: Myanmar, Korea, and the U.S.

( Boo-young Lim ),( Youn Jung Huh ),( Haesung Im ),( Vickie E. Lake ),( Seung-ryoul Lim ) 한국유아교육학회 2023 INTERNATIONAL JOURNAL OF EARLY CHILDHOOD EDUCATION Vol.29 No.1

This study explores the views of Myanmar parents on the home math environment for their young children in Myanmar, Korea, and the U.S. Previous research has focused on understanding parental practices within Western contexts, yet studies have shown that cultural factors may influence parents' views on the home math environment. The participants comprised of two parents respectively from Myanmar, Korea, and the United States. By utilizing a survey, individual interviews, video recordings of math activities, and reflective video interviews, this study revealed that most Myanmar parents perceived preschool education as the primary avenue for teaching their children mathematics and overlooked the value of home-based learning as a valuable resource. Additionally, these parents seldom considered their role in supporting their children's mathematical development at home. The study highlights the significance of comprehending parents' implicit views regarding providing a conducive home math environment before analyzing their actual practices.