http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Jaebeom Jeon,Jae Won Jeong,Yeon Sik Jung 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.5
In spite of the high specific capacity and energy density of Li–S batteries based on low-cost sulfur as the active material, theirpractical use has not yet been realized due to the undesirable formation of soluble polysulfides (PS) during electrochemicalcycles and their shuttling effect. In order to minimize this serious issue caused by the active material dissolution, transitionmetal compounds such as oxides, nitrides, and sulfides have alternatively been used to capture the PS and also to provideelectron pathways in the S electrode. However, high-performance additive materials having both high affinity to PS and highelectronic conductivity have not been developed thus far. Herein, we report the preparation and application of a new additivematerial—titanium(III) sulfide (Ti2S3) nanoparticles covered with multicomponent (Ti–S–O) oxide (MO–Ti2S3), which canbe synthesized on a large scale using an inductively-coupled thermal plasma synthesis method followed by a simple surfaceoxidation treatment. MO–Ti2S3 shows much higher PS affinity than other titanium compounds and electronic conductivitythat is comparable to that of carbon black. Furthermore, MO–Ti2S3 shows much higher resistance to heat and oxidation whilehaving charge–discharge stability when compared with TiS2. Finally, we show that the cyclability and specific capacity of theLi–S battery can be significantly enhanced by incorporating MO–Ti2S3 in the cathode when compared to utilizing C species.
Dohyun Lim,Jaebeom Park,Jongwon Park,Seul Jung 제어로봇시스템학회 2022 제어로봇시스템학회 국제학술대회 논문집 Vol.2022 No.11
This paper presents sliding mode control for hydraulic manipulators. In the teleoperated configuration, the slave robot is actuated by hydraulic systems, which suffer from nonlinearity. When the master moves by an operator, the slave robot is required to move after the master. The slave robot is regulated by a sliding mode controller to minimize the tracking errors caused by nonlinearities in hydraulic actuators. Experimental studies of position tracking control by PID and sliding mode controllers are conducted to demonstrate the performances in the teleoperated configuration.
Photoluminescence enhancement of quantum dots on Ag nanoneedles
Ahmed, Syed Rahin,Cha, Hee Ryoung,Park, Jung Youn,Park, Enoch Y,Lee, Dongyun,Lee, Jaebeom Springer 2012 NANOSCALE RESEARCH LETTERS Vol.7 No.1
<P>Noble metal nanostructure allows us to tune optical and electrical properties, which has high utility for real-world application. We studied surface plasmon-induced emission of semiconductor quantum dots (QDs) on engineered metallic nanostructures. Highly passive organic ZnS-capped CdSe QDs were spin-coated on poly-(methyl methacrylate)-covered Ag films, which brought QDs near the metallic surface. We obtained the enhanced electromagnetic field and reduced fluorescence lifetimes from CdSe/ZnS QDs due to the strong coupling of emitter wave function with the Ag plasmon resonance. Observed changes include a six-fold increase in the fluorescence intensity and striking reduction in fluorescence lifetimes of CdSe/ZnS QDs on rough Ag nanoneedle compared to the case of smooth surfaces. The advantages of using those nanocomposites are expected for high-efficiency light-emitting diodes, platform fabrication of biological and environmental monitoring, and high-contrast imaging.</P>
Lee, Kyoung G.,Wi, Rinbok,Park, Tae Jung,Yoon, Sun Hong,Lee, Jaebeom,Lee, Seok Jae,Kim, Do Hyun Royal Society of Chemistry 2010 Chemical communications Vol.46 No.34
<P>Fluorescent silica nanoparticles deposited with highly monodisperse gold nanoparticles (1–2 nm) were synthesized <I>via</I> the W/O method and intensive ultrasound irradiation. A large surface area of gold-doped fluorescent silica nanoparticle serves as a platform to immobilize a specific binding protein for biomolecules interaction in bioimaging applications.</P> <P>Graphic Abstract</P><P>Gold nanoparticles are doped on the surface of fluorescent silica under highly intensive ultrasound irradiation for detecting avian influenza virus. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cc00762e'> </P>
Mao, Xiang,Kim, Jin-Gyu,Han, Jishu,Jung, Hyun Suk,Lee, Sang Gil,Kotov, Nicholas A.,Lee, Jaebeom American Chemical Society 2014 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.136 No.20
<P>Iron chalcogenides hold considerable promise for energy conversion and biomedical applications. Realization of this promise has been hindered by the lack of control over the crystallinity and nanoscale organization of iron chalcogenide films. High-quality nanoparticles (NPs) from these semiconductors will afford further studies of photophysical processes in them. Phase-pure NPs from these semiconductors can also serve as building blocks for mesoscale iron chalcogenide assemblies. Herein we report a synthetic method for FeSe<SUB><I>x</I></SUB> (<I>x</I> = 1, 2) NPs with a diameter of ca. 30 nm that satisfy these needs. The high crystallinity of the individual NPs was confirmed by transmission electron microscopy (TEM) and energy-dispersive X-ray analysis. TEM tomography images suggest pucklike NP shapes that can be rationalized by bond relaxation at the NP edges, as demonstrated in large-scale atomic models. The prepared FeSe<SUB><I>x</I></SUB> NPs display strong photoluminescence with a quantum yield of 20%, which was previously unattainable for iron chalcogenides. Moreover, they also show strong off-resonant luminescence due to two-photon absorption, which should be valuable for biological applications.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2014/jacsat.2014.136.issue-20/ja412654c/production/images/medium/ja-2013-12654c_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja412654c'>ACS Electronic Supporting Info</A></P>
서보휘(Bohwi Seo),김재훈(Jaehoon Kim),박재범(Jaebeom Park),정규동(Gyoodong Jung) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Cracks can be generated and propagated due to high combustion pressure in the service time of solid propellant. These cracks expand the burning area and lead to excessive combustion. Consequently, the solid rocket can cause malfunction or the performance deteriorated. Therefore, it is very important to estimate the crack propagation resistance of solid propellant. In this study, edge cracked sheet specimen made by HTPB(Hydroxyl-Terminated Polybutadiene) solid propellant was used to perform the crack propagation tests. These tests were conducted in the range of temperature -60℃ to 60℃ under 2.54 and 12.7 mm/min of crosshead rate by using INSTRON 5567 testing machine with environmental chamber. Based on the test results, the stress intensity factors and a crack propagation rates were calculated. The crack resistance curves show the transition that stress intensity factors increase as temperature decrease. Also, fracture surfaces were investigated by scanning electron microscope to determine the fracture behavior under various temperatures.