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안광호(Kwangho Ahn),이주형(Juhyung Lee),조준영(Joonyoung Cho),오혁준(Hyukjun Oh) 한국통신학회 2011 韓國通信學會論文誌 Vol.34 No.6
현대전은 플랫폼 기반의 전장(PCW: Platform Centric Warfare)에서 네트워크 기반의 전장(NCW: Network Centric Warfare)으로 변화하고 있다. 네트워크 기반의 전장으로 변화하면서 네트워크 운용 및 관리의 중요성이 높아지고 있다. 본 논문은 군사용 무선 네트워크에서의 노드 이탈 관리 기법을 제안한다. 군사용 무선 네트워크는 노드의 네트워크 가입, 탈퇴가 비교적 자유로운 특징을 갖는다. 이러한 특징은 네트워크 가용성을 저해하는 요인이 될 수 있다. 일반 노드의 네트워크 이탈 상황에서 발생하는 가용성 저해요인을 파악하고, 이에 대해 RSSI(Received Signal Strength Indication)를 이용한 네트워크 탈퇴 예측 방법를 이용한 기법을 제시한다. 마지막으로 모의실험을 통해 측정 RSSI 신호 시간 간격에 따른 예측 성공률을 확인한다. Modern warfares have changed from PCW (Platform Centric Warfare) to NCW (Network Centric Warfare). Therefore, it is more important to operate and manage the network. This paper proposed a node management scheme in military wireless networks. In military wireless networks, nodes can join and leave the networks easily. It causes a degradation of network capacity. This paper figured out a problem caused by node which is leaving the network. This paper proposed a RSSI based method of estimating and detecting the leaving nodes in the networks. Finally, an experimental result was demonstrated to show the efficiency of the proposed method.
Kang, Suhee,Jang, Joonyoung,Pawar, Rajendra C.,Ahn, Sunghoon,Lee, Caroline Sunyong The Royal Society of Chemistry 2018 Dalton Transactions Vol.47 No.21
<P>We report the coating of metal-free graphitic carbon nitride (g-C3N4) onto titanium dioxide (TiO2) nanorods <I>via</I> a thermal evaporation method. Prior to g-C3N4 coating, TiO2 nanoclusters were grown on TiO2 nanorods to enhance the surface area by dipping in a TiCl3 solution for 12, 24 and 36 h. The prepared films were analyzed to assess the improvement in absorbance and reduction in recombination losses. Nanoclustered TiO2 grown for 24 h and then coated with a g-C3N4 film (<I>i.e.</I>, TC_24h_CN) had the highest photocurrent of 235 and 290 μA, respectively, when measured by transient photocurrent and linear sweep voltammetry techniques. The enhanced performance resulted from a reduced recombination of electron-hole pairs. The TC_24h_CN film displayed an excellent photoresponse over 15 h of exposure to visible light and hence could potentially be used in water purification device technology.</P>
Kang, Suhee,Jang, Joonyoung,Ahn, Sung-hoon,Lee, Caroline Sunyong The Royal Society of Chemistry 2019 Dalton Transactions Vol.48 No.6
<P>Herein, we newly design a ternary structure of 1-dimensional hollow g-C3N4 nanofibers (HGCNF) decorated with molybdenum disulfide (MoS2) and sulfur/nitrogen-doped graphene (SNG) <I>via</I> a one-pot hydrothermal treatment at relatively low temperature. The firstly presented HGCNF are fabricated using electrospinning followed by the thermal sintering method. After that, MoS2 is grown onto HGCNF, while SNG covered the structures during the hydrothermal method. We observed the morphological structures, chemical composition and optical absorbance of this ternary HGCNF/SNG/MoS2 structure. Of the as-prepared catalysts, HGCNF/SNG/MoS2 exhibited a good possibility to produce hydrogen as an electrocatalyst. Furthermore, we evaluated its stability performance using chronoamperometry for 48 hours, as well as by 3000 cycles of cyclic voltammetry. From the double-layer capacitance measurement, HGCNF/SNG/MoS2 proved itself as an electrocatalyst due to the higher value of electrocatalytically active sites to be 6.97 × 10<SUP>−3</SUP> F cm<SUP>−2</SUP> than that of only HGCNF (0.18 × 10<SUP>−5</SUP> F cm<SUP>−2</SUP>) and the binary structure of HGCNF/MoS2 (2.54 × 10<SUP>−3</SUP> F cm<SUP>−2</SUP>). We believe that our novel 1-dimensional ternary HGCNF/SNG/MoS2 structure has expedited the electron pathways by reducing the resistance at interfaces among HGCNF, SNG and MoS2, to be potentially useful for the hydrogen evolution reaction.</P>
이성환(Seounghwan Lee),라광열(Kwangyouel Raa),최준영(Joonyoung Choe),이광호(Kwangho Lee),안유민(Yoomin Ahn),조남규(Namgyoo Cho),황승용(Seungyong Hwang) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
A system for the electrical bio signal detection for a microchip is proposed. Gold nanoparticles were selected for the system for their bio-compatibility and potential for higher sensitivity with large surface areas. For the estimation of the conductivity of gold nanoparticles, microchips with interdigitated microelectrodes of 3, 5, 7 and 9㎛ spacing were fabricated. In addition, a simulation program was developed to estimate the electrical resistance of the fabricated microchip. The results of conduction simulation for the nanoparticles show good agreement s with experimental data, which validate the proposed system.