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ORiginal Article : Endoscopic Management of Bile Leakage after Liver Transplantation
( Dongwook Oh ),( Sung Koo Lee ),( Tae Jun Song ),( Do Hyun Park ),( Sang Soo Lee ),( Dong Wan Seo ),( Myung Hwan Kim ) The Editorial Office of Gut and Liver 2015 Gut and Liver Vol.9 No.3
Background/Aims: Endoscopic retrograde cholangiopancreatography (ERCP) can be an effective treatment for bile leakage after liver transplantation. We evaluated the efficacy of endoscopic treatment in liver transplantation in patients who developed bile leaks. Methods: Forty-two patients who developed bile leaks after liver transplantation were included in the study. If a bile leak was observed on ERCP, a sphincterotomy was performed, and a nasobiliary catheter was then inserted. If a bile leak was accompanied by a bile duct stricture, either the stricture was dilated with balloons, followed by nasobiliary catheter insertion across the bile duct stricture, or endoscopic retrograde biliary drainage was performed. Results: In the bile leakage alone group (22 patients), endoscopic treatment was technically successful in 19 (86.4%) and clinically successful in 17 (77.3%) cases. Among the 20 patients with bile leaks with bile duct strictures, endoscopic treatment was technically successful in 13 (65.0%) and clinically successful in 10 (50.0%) cases. Among the 42 patients who underwent ERCP, technical success was achieved in 32 (76.2%) cases and clinical success was achieved in 27 (64.3%) cases. Conclusions: ERCP is an effective and safe therapeutic modality for bile leaks after liver transplantation. ERCP should be considered as an initial therapeutic modality in post-liver transplantation patients. (Gut Liver 2015;9:417-423)
Characteristic Variation of 3-D Solenoid Embedded Inductors for Wireless Communication Systems
Dongwook Shin,윤일구,Changhoon Oh,Kilhan Kim 한국전자통신연구원 2006 ETRI Journal Vol.28 No.3
The characteristic variation of 3-dimensional (3-D) solenoid-type embedded inductors is investigated. Four different structures of a 3-D inductor are fabricated by using a low-temperature co-fired ceramic (LTCC) process, and their s-parameters are measured between 50 MHz and 5 GHz. The circuit model parameters of each building block are optimized and extracted using the partial element equivalent circuit method and an HSPICE circuit simulator. Based on the model parameters, the characteristics of the test structures such as self-resonant frequency, inductance, and quality (Q) factor are analyzed, and predictive modeling is applied to the structures composed of a combination of the modeled building blocks. In addition, characteristic variations of the 3-D inductors with different structures using extracted building blocks are also investigated. This approach can provide a characteristic estimation of 3-D solenoid embedded inductors for structural variations.
Oh, Minhak,Rajput, Lalit,Kim, Dongwook,Moon, Dohyun,Lah, Myoung Soo American Chemical Society 2013 Inorganic chemistry Vol.52 No.7
<P>Isostructural 3D metal–organic frameworks (MOFs) [Zn<SUB>2</SUB>(BTC)(NO<SUB>3</SUB>)S<SUB>3</SUB>] [where BTC = 1,3,5-benzenetricarboxylate; S = EtOH (<B>1</B>), DMF (<B>2</B>), DMA (<B>3</B>), or DEF (<B>4</B>)] of a 3-connected <B>srs</B> net topology have been prepared in the presence of serine as a template. The MOFs show different framework stabilities depending on the sizes of the ligated solvent molecules and undergo a crystal-to-crystal transformation at ambient conditions into a 1D chain structure either directly or via different types of intermediates depending on the ligated solvent molecules and the sample handling conditions. A single crystal of the MOF with the ligated DMF molecules, [Zn<SUB>2</SUB>(BTC)(NO<SUB>3</SUB>)(DMF)<SUB>3</SUB>] (<B>2</B>), is stable in Mg<SUP>II</SUP>- and Co<SUP>II</SUP>-DMF solutions; however, it transforms into a single particle-like microcrystalline aggregate of Cu-HKUST-1 in a Cu<SUP>II</SUP>-DMF solution.</P><P>Isostructural 3D metal−organic frameworks (MOFs) undergo a crystal-to-crystal transformation at ambient conditions into a 1D chain structure either directly or via different types of intermediates depending on the ligated solvent molecules and the sample handling conditions. A single crystal of the MOF with ligated DMF molecules, [Zn<SUB>2</SUB>(BTC)(NO<SUB>3</SUB>)(DMF)<SUB>3</SUB>] (<B>2</B>), transforms into a single particle-like microcrystalline aggregate of Cu-HKUST-1 in a Cu<SUP>II</SUP>-DMF solution.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/inocaj/2013/inocaj.2013.52.issue-7/ic302641v/production/images/medium/ic-2012-02641v_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ic302641v'>ACS Electronic Supporting Info</A></P>
Circuit Modeling of 3-D Parallel-plate Capacitors Fabricated by LTCC Process
Dongwook Shin,윤일구,Changhoon Oh,Kyubok Lee,Jongkyu Kim 한국전기전자재료학회 2004 Transactions on Electrical and Electronic Material Vol.5 No.1
A novel method of high speed, accurate circuit simulation in 3-dimensional (3-D) parallel-plate capacitors is investigated. The basic concept of the circuit simulation methods is partial element equivalent circuit model. The three test structures of 3-D parallel-plate capacitors are fabricated by using multi-layer low-temperature co-fired ceramic (LTCC) process and their S-parameters are measured between 50 MHz and 5 GHz. S-parameters are converted to Y-parameters, for comparing measured data with simulated data. The circuit model parameters of the each building block are optimized and extracted using HSPICE circuit simulator. This method is convenient and accurate so that circuit design applications can be easily manipulated.
Oh, Minhak,Liu, Xinfang,Park, Mira,Kim, Dongwook,Moon, Dohyun,Lah, Myoung Soo Royal Society of Chemistry 2011 Dalton Transactions Vol.40 No.21
<P>The self-assembly of a polyprotic pentadentate ligand, <I>N</I>-cyclopentanoylaminobenzoylhydrazide (H<SUB>4</SUB>L<SUP><B>4</B></SUP>), and an In(<SMALL>III</SMALL>) nitrate hydrate in methanol led to a strained hexanuclear indium metal–organic macrocycle (In–MOM), [In(<SMALL>III</SMALL>)<SUB>6</SUB>(H<SUB>2</SUB>L<SUP><B>4</B></SUP>)<SUB>6</SUB>(NO<SUB>3</SUB>)<SUB><I>x</I></SUB>(solvent)<SUB>6−<I>x</I></SUB>](NO<SUB>3</SUB>)<SUB>6−<I>x</I></SUB> (where, the solvent is either methanol or a water molecule and <I>x</I> is the number of the nitrate anions ligated). The ligand in the doubly deprotonated state serves as an unsymmetric linear ditopic donor and the alternating indium ions in two different chelation modes serve as two different bent ditopic metal acceptors, which led to a <I>D</I><SUB>3</SUB>-symmetric hexanuclear In–MOM. Although the hexanuclear In–MOM is enthalpically unfavorable because of the ring strain, the combination of the soft coordination characteristic of the indium ion and the slight ligand deformation from the conjugated planar conformation allows the formation of the entropically favored hexanuclear In–MOM rather than the enthalpically favored octanuclear In–MOM. While the hexanuclear In–MOM is stable in acetonitrile, it partially dissociates into its components in dimethylsulfoxide, and then slowly reaches a new equilibrium state with several different indium species yet to be identified in addition to the free ligand.</P> <P>Graphic Abstract</P><P>The self-assembly of <I>N</I>-cyclopentanoylaminobenzoylhydrazide (H<SUB>4</SUB>L<SUP><B>4</B></SUP>), and an In(<SMALL>III</SMALL>) ion led to a strained but entropically favored 18-membered hexanuclear In–MOM, where the alternating metal centers are in two different chelation modes. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1dt10220f'> </P>
IMPROVEMENT OF JCVM SYSTEM'S ARCHITECTURE FOR SMART CARD USING LARGE MEMORY SYSTEM
Dongwook Lee,Sewon Oh,Yoonsim Yang,Wonho Choi,Hayong Jeon,Chuljoon Hwang,MinSik Jin,Minsoo Jung 한국멀티미디어학회 2006 한국멀티미디어학회 국제학술대회 Vol.2006 No.-
Java Card System first backups the previous data about Java objects into the transactionbuffer, then writes new data into EEPROM, during the downloading and execution of Java Card's application called an applet. Java Card technology supports both persistent object stored in EEPROM and transient objects stored in RAM because of the high limitation of its memory resources. In this paper, we made a suggestion on how to improve the speed of the execution by using the improved data store mechanism and memory structure. We moved Java Objects stored heap area in EEPROM into RAM. It makes Java Card much faster and is similar with the execution of application and the memory management in Java System of PC environment.
과산화수소 분해용 망간 촉매의 균일성 향상을 위한 초음파 처리
장동욱(Dongwook Jang),오택현(Taek Hyun Oh),이다혜(Dahae Lee),권세진(Sejin Kwon) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.12
과산화수소 단일추진제 추력기의 균일성 향상을 위하여 초음파 처리를 이용한 망간 촉매 제작을 수행하였다. 초음파를 사용한 촉매 제작은 다수의 연구그룹에 의해 성능 향상이 보고되고 있다. 기존의 단순 침적법으로 제작한 촉매와 성능 비교를 위해 반응성 실험을 실시하였다. 반응성 실험 결과 초음파 처리를 한 촉매에서 촉매의 균일성과 반응성 모두 큰 폭으로 증가하였다. 고유량 환경에서 경향성을 알아보기 위해 50 N 단일추진제 추력기 펄스 작동 실험을 수행하였다. 실험 결과 상승시간 (Rising time)과 압력 불안정성 특성이 기존 단순 침적법으로 제작한 촉매에 비해 모두 2배씩 상승하였다. In order to improve the catalyst distribution of manganese catalyst, which was used in H₂O₂ monopropellant thruster, the catalyst preparation process was carried out using the ultrasound treatment. The reactivity test were conducted for performance comparison between the catalysts which were made by incipient wetness method and the ultrasound treatment. The test results showed that the catalyst using ultrasound treatment increase the uniformity and reactivity than that of catalyst using incipient wetness method. In order to observe the trend in high mass flow rate condition, the 50 N vacuum class monopropellant thruster tests were also carried out. In the test result of catalyst using ultrasound, the rising time and pressure instability were twice better than in the case of catalyst which was made by incipient wetness method.