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Lee, Yangwoo,Park, Ye-Jin,Kim, Changho,So, Ju-Hee,Yeom, Bongjun,Koo, Hyung-Jun Elsevier 2019 Polymer Vol.164 No.-
<P><B>Abstract</B></P> <P>We report agarose-polymer-based composite microfibers with enhanced conductivity and fast humidity sensing owing to incorporation of conductive nanofillers. The microfibers are fabricated by extruding a hydrogel filament containing silver nanowires (AgNWs) and graphene oxide (GO, chemically reduced after extrusion) as 1D and 2D nanofillers, respectively. For the same concentration, GO enhances the mechanical properties of the microfibers more effectively than AgNWs. The microfiber with nanofillers has a higher Young's modulus than commercial nylon-6 and polyamide. Due to synergy between AgNWs and reduced GO (rGO), the microfiber with both fillers shows higher conductivity than those with only one filler. The flexible microfiber retains its conductivity well under repeated bending/unbending cycles. Since rGO ionizes water molecules, the conductivity of the microfiber increases with increasing environmental humidity. Humidity sensing ability of the composite microfiber, based on the humidity-dependent conductivity, is demonstrated. The microfiber with both nanofillers respond rapidly and reversibly to humidity changes because the AgNWs facilitate charge carrier transport and water adsorption/desorption. The humidity sensor based on the composite microfiber also reliably detects repeated short human breaths.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Conducting microfibers were prepared by using AgNW (1D) and rGO (2D) nanofillers. </LI> <LI> The synergistic effect of 1D and 2D nanofillers on conductivity was investigated. </LI> <LI> The fiber exhibits excellent mechanical stability and fast humidity sensing ability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Lee, Yangwoo,Kim, Sung‐,Kon,Park, Ye‐,Jin,Cho, Jiung,Koo, Hyung‐,Jun John Wiley Sons, Inc. 2019 Polymer composites Vol.40 No.9
<P>Herein, we present a humidity sensing microfiber based on an agarose polymer as a hydrophilic matrix and carbon nanotubes (CNT) as conducting fillers. The humidity‐dependent resistance is the key property of the composite microfiber as a humidity sensor. The composite microfiber composed of the agarose matrix swells or contracts depending on environmental humidity, leading to changes in junction density between the carbon nanotube conducting fillers inside the fiber. Moreover, adsorption of water molecules on the CNT filler could further increase the resistance of the microfiber sensor. The real‐time resistance monitoring of the microfiber shows reliable and reversible response to the repetitive changes in relative humidity with reasonable response rate. The tensile strength test confirms the mechanical robustness of the composite microfiber. The fabrication process is facile and presumably scalable. Such a practical fiber sensor could be readily used as a humidity‐sensing component in smart textile and wearable devices. POLYM. COMPOS., 40:3582–3587, 2019. © 2019 Society of Plastics Engineers</P>
서양우(Yangwoo Seo),이계신(Kyeshin Lee),이연호(Younho Lee),김제용(Jeyong Kim) 한국신뢰성학회 2018 신뢰성응용연구 Vol.18 No.3
Purpose: Previously, missile reliability prediction is based on theoretical failure prediction model. It has shown that the predicted reliability is inadequate to real field data. Although an MTTF based reliability prediction method using real field data has recently been studied to overcome this issue. In this paper, we present a more realistic method, considering MTBF concept, to predict missile reliability. Methods: In this paper we proposed a modified survival model. This model is considering MTBF as its core concept, and failed missiles in the model are to be repaired and redeployed. We compared the modified model (MTBF) and the previous model (MTTF) in terms of fitness against the real failure data. Results: The reliability prediction result of MTBF based model is closer to fields failure data set than that of MTTF based model. Conclusion: The proposed MTBF concept is more fitted to real failure data of missile than MTTF concept. The methodology of this study can be applied to analyze field failure data of other similar missiles.
이동헌(Donghun Lee),홍창열(Changyoul Hong),김영곤(Younggon Kim),유양우(Yangwoo Ryu),박성진(Seongjin Park),이명준(Myungjoon Lee) 한국정보과학회 1998 정보과학회 컴퓨팅의 실제 논문지 Vol.4 No.4
CORBA는 OMG에서 개방 분산 객체 컴퓨팅의 표준으로 제시한 하부구조이며, 이기종의 컴퓨터 시스템으로 구성된 계산 환경에서 분산 객체들간의 상호 운용성을 보장한다. 본 논문에서는, Ada95를 이용하여 개발 중인 ReCA(a Reliable CORBA system using Ada95) CORBA 시스템의 핵심 부분인 ORB의 설계및 구현에 대하여 기술한다. ReCA ORB의 주요 구성요소에는 기반 통신 계층, ORB core, BOA가 있다. ReCA ORB의 기반 통신 계층은 하부 통신 시스템에 독립적인 VOOL(Virtual Object-Oriented Low-level) 계층과 VOOL 상에서 ORB들 간의 메시지 전송을 위해 이용되는 RMC(Remote Method Call) 계층으로 구성된다. 객체 요청간의 동기화와 병행성의 조작을 위해서 ReCA BOA는 보호 객체와 태스크풀과 같은 Ada95의 병행성 기능을 이용하여 ReCA ORB가 안정적이면서도 효율적으로 다중 객체 요청을 다룰 수 있도록 한다. COREA is an open distributed object computing infrastructure standardized by the OMG and guarantees interoperability between distributed objects in the computing environment composed of heterogeneous computer systems. In this paper, we describe a design and implementation of ReCA(a Reliable CORBA system using Ada95) ORB which is the core part of ReCA CORBA system being developed in Ada95. Major components of ReCA ORB are a fundamental communication layer, ORB core, and BOA. The fundamental communication layer of ReCA ORB consists of a VOOL(Virtual Object-Oriented Low-level) layer which is independent of low-level communication subsystems, and a RMC(Remote Method Call) layer which is used for passing messages between ORBs over the VOOL layer. For synchronization and concurrency control between object requests, ReCA BOA uses the concurrency features in Ada95 such as protected objects and task pools, which enable the ReCA ORB to handle multiple object requests both reliably and efficiently.
JXTA 플랫폼 기반 분산 정보 검색 시스템 설계 및 구현에 관한 연구
이승하 ( Seungha Lee ),방세중 ( Sechung Pang ),이필우 ( Pilwoo Lee ),김양우 ( Yangwoo Kim ) 한국정보처리학회 2008 한국정보처리학회 학술대회논문집 Vol.15 No.1
일반적인 정보검색 시스템은 중앙 집중식의 서버/클라이언트 방식을 사용한다. 이 방식은 서버 집중방식으로 시스템의 부하가 가중될 경우 추가적인 자원 확보에 어려움을 가진다. P2P(Peer-to-Peer) 기술은 이러한 중앙 서버의 문제점을 해결하기 위해 제안된 것이다. JXTA 플랫폼은 P2P 서비스를 제공하기 위한 오픈 소스 프로젝트로서 본 논문은 정보검색 시스템의 부하가 늘어날 경우 유연한 자원 확보를 위해 JXTA 플랫폼 기반의 JXIR(Jxta Information Retrieval) 시스템을 설계하고 구현하였다.