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이수진,박민정,김나희,서승현,Soojin Lee,Min-Jeong Park,Na-Hee Kim,Seung-Hyun Seo 한국정보처리학회 2023 정보처리학회논문지. 컴퓨터 및 통신시스템 Vol.12 No.7
공유 전동킥보드의 사용이 급증하면서 공유 모빌리티의 불법 주차 사례가 많이 발생하고 있다. 이 문제를 해결하기 위해 지자체에서는 불법 주차된 공유 전동킥보드 견인 등의 조치를 취하고 있지만 악의적인 이용자에 대한 관리는 이루어지지 않고 있으며 비효율적인 방안이다. 이에 따라 본 논문에서는 블록체인 기반의 공유 전동킥보드 이용자 관리 모델을 제안한다. 공유 전동킥보드에는 주차 상태를 확인할 수 있는 카메라 센서, GPS 등이 탑재되어 있으며 이용자가 공유 전동킥보드 이용을 종료를 하게 되면 반납 시 주차 상태에 대한 정보를 탑재된 센서들을 통해 수집하여 공유 전동킥보드 회사가 이용자가 올바르게 주차했는지 확인할 수 있다. 또한 이용자의 주차 내역에 따라 신뢰점수를 부여하고 신뢰점수에 따라 인센티브를 지급하여 이용자가 스스로 공유 전동킥보드를 올바르게 반납할 수 있도록 유도한다. 해당 정보들은 공유 전동킥보드 회사들이 참여하는 컨소시엄 블록체인을 통해 공유되어 공유 전동킥보드 회사들의 통합적인 이용자 관리가 가능하다. As the use of shared electric kickboards is rapidly increasing, there are many cases of illegal parking of shared mobility. In order to solve this problem, local governments are taking measures such as towing illegally parked shared electric kickboards, but user management is not considered and the methods are inefficient. Accordingly, in this paper, we propose a blockchain-based shared electric kickboard user management model. The shared electric kickboard is equipped with a camera sensor and GPS that can check the parking status, and when the user ends the use of the shared electric kickboard, information on the parking status is collected through the installed sensors and the shared electric kickboard company You can check if the user has parked correctly. In addition, trust points are given according to the user's parking history and incentives are provided according to the trust points, inducing users to return the shared evangelism kickboard correctly. The information is shared through the consortium blockchain in which shared electric kickboard companies participate, enabling integrated user management of shared electric kickboard companies.
Park, Minwoo,Im, Jungkyun,Shin, Minkwan,Min, Yuho,Park, Jaeyoon,Cho, Heesook,Park, Soojin,Shim, Mun-Bo,Jeon, Sanghun,Chung, Dae-Young,Bae, Jihyun,Park, Jongjin,Jeong, Unyong,Kim, Kinam Nature Pub. Group 2012 Nature nanotechnology Vol.7 No.12
<P>Conductive electrodes and electric circuits that can remain active and electrically stable under large mechanical deformations are highly desirable for applications such as flexible displays, field-effect transistors, energy-related devices, smart clothing and actuators. However, high conductivity and stretchability seem to be mutually exclusive parameters. The most promising solution to this problem has been to use one-dimensional nanostructures such as carbon nanotubes and metal nanowires coated on a stretchable fabric, metal stripes with a wavy geometry, composite elastomers embedding conductive fillers and interpenetrating networks of a liquid metal and rubber. At present, the conductivity values at large strains remain too low to satisfy requirements for practical applications. Moreover, the ability to make arbitrary patterns over large areas is also desirable. Here, we introduce a conductive composite mat of silver nanoparticles and rubber fibres that allows the formation of highly stretchable circuits through a fabrication process that is compatible with any substrate and scalable for large-area applications. A silver nanoparticle precursor is absorbed in electrospun poly (styrene-block-butadiene-block-styrene) (SBS) rubber fibres and then converted into silver nanoparticles directly in the fibre mat. Percolation of the silver nanoparticles inside the fibres leads to a high bulk conductivity, which is preserved at large deformations (σ???2,200?S?cm(-1) at 100% strain for a 150-?m-thick mat). We design electric circuits directly on the electrospun fibre mat by nozzle printing, inkjet printing and spray printing of the precursor solution and fabricate a highly stretchable antenna, a strain sensor and a highly stretchable light-emitting diode as examples of applications.</P>
Park, Hyungmin,Choi, Sinho,Lee, Sung-Jun,Cho, Yoon-Gyo,Hwang, Gaeun,Song, Hyun-Kon,Choi, Nam-Soon,Park, Soojin Elsevier 2016 Nano energy Vol.26 No.-
<P><B>Abstract</B></P> <P>Nanostructured silicon is a promising candidate material for practical use in energy storage devices. However, high temperature operation remains a significant challenge because of severe electrochemical side reactions. Here, we show the design of ultra-durable silicon made by introducing dual coating layers on the silicon surface, allowing stable operation at high temperature. The double layers, which consist of amorphous metal titanate and carbon, provide several advantages including: (i) suppression of volume expansion during Li<SUP>+</SUP> insertion; (ii) creation of a stable solid-electrolyte−interface layer; and (iii) preservation of original Si morphology over 600 cycles at high temperature. The resulting silicon-based anode exhibits a reversible capacity of 990mAhg<SUP>−1</SUP> after 500 cycles at 25°C and 1300mAhg<SUP>−1</SUP> after 600 cycles at 60°C with a rate of 1C.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We synthesized a new class of Si-based anode materials by synergistic coupling of amorphous ABO<SUB>x</SUB> and carbon coating. </LI> <LI> ABO<SUB>x</SUB> stabilizes the solid-electrolyte-interphase layers, while carbon acts as an electrical conducting material. </LI> <LI> Si-based anodes show exceptional high-temperature cycling stability with a high specific capacity of 1300mAhg<SUP>−1</SUP> after 600 cycles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>A new class of Si-based materials is fabricated by synergistic coupling of amorphous ABO<SUB>x</SUB> and carbon coating layers onto Si particles. In this system, ABO<SUB>x</SUB> stabilizes the SEI layers, while carbon acts as an electrical conducting material. The resulting Si-based anodes exhibit high specific capacities (1667mAhg<SUP>−1</SUP> (25°C) and 2021mAhg<SUP>−1</SUP> (60°C) at 1C rate) and highly stable cycling performances (capacity retention of 60% after 500 cycles at 25°C and 64% after 600 cycles at 60 °C).</P> <P>[DISPLAY OMISSION]</P>