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Photocatalytic reduction of hexavalent chromium (Cr(VI)) using rotating TiO2 mesh
Jaekyung Yoon,Eunjung Shim,Hyunku Joo 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.5
An immobilized TiO2 electrode for photocatalytic hydrogen production is applied to reduce toxic Cr(Ⅵ) to non toxic Cr(Ⅲ) in aqueous solution under UV irradiation. To overcome the limitation of powder TiO2, a novel technique of immobilization based on anodization was applied and investigated under various experimental conditions. The anodization was performed with three different electrolytes (single or mixed), and then the anodized samples were annealed under an oxygen stream. Among the three kinds of anodized/annealed TiO2 on Ti foil, SampleⅡ(anodized at 20 V in 0.5% HF for 45 min at 5℃, and annealed at 450℃ for 5 hr in ambient oxygen at a flow rate of 400 mL/ min) was more effective for both Cr(Ⅵ) reduction than the other samples. Based on the electrolyte compositions, nanotubular TiO2 grown on Ti meshes was fabricated for the purpose of its light-harvesting ability and efficiency, where the anodized/annealed TiO2 on meshes were rotated in the center of the reactor and Cr(Ⅵ) could be effectively reduced at rotation speeds ranging from 0 to 64 rpm. In case of Sample Ⅱ, it was found that up to 98 % of the Cr(Ⅵ) was reduced in 30 min at 64 rpm.
고층 건물 화재 관련 R&D 위상 분석 및 신기술 탐색 연구
심위(We Shim),최재경(Jaekyung Choi),정현상(Hyunsang Chung),허요섭(Yoseob Heo),서성호(Seongho Seo) 한국산업융합학회 2020 한국산업융합학회 논문집 Vol.23 No.2
Due to the development of the urban economy, high-density buildings and skyscrapers have continued to increase in order to alleviate high population densities and to make efficient use of urban space. However, a fire in a high-rise building is a disaster that can lead to massive casualties and property damage because of the difficulty of firefighting and escaping. Various studies have been conducted on these high-rise buildings because they are sympathetic to these difficulties all over the world. In this paper, trends of researches and technologies related to fire in high-rise buildings are analyzed synthetically through thesis and patent data. In other words, we explored the trends of various studies that have been carried out so far through the thesis, and performed technical monitoring on actual implemented technology and newly implemented technologies through patent data. Through this research, we have studied the present and the future of technology for high-rise building fire.
Plastid genome of Aster altaicus var. uchiyamae Kitam., an endanger species of Korean asterids
Park, Jihye,Shim, Jaekyung,Won, Hyosig,Lee, Jungho The National Institute of Biological Resources 2017 Journal of species research Vol.6 No.1
Aster altaicus var. uchiyamae Kitam. is an endemic taxon of Korea and is protected by law as an endanger taxon. The genetic information of A. altaicus var. uchiyamae is unavailable in Genbank. Here we sequenced chloroplast genome of A. altaicus var. uchiyamae. The cp-genome of Aster altaicus var. uchiyamae was 152,446 bps in size: LSC was 84,240 bps, IR 25,005 bps, SSC 18,196 bps. The cp-genome contains 112 genes and 21 introns consisted of 79 protein coding genes(PCGs), 4 RNA genes, and 29 tRNA genes, with 20 group II introns and one group I intron. There were three pseudo-genes including ${\psi}$-ycf1, ${\psi}$-rps19, and ${\psi}$-trnT_GGU. Eighteen genes, five introns, and parts of two genes and an intron are found within the IR, which has two copies. The cp-DNA of Aster altaicus var. uchiyamae is distinguished from A. spathulifolius, only known cp-genome of the genus Aster, by 172 SNP in genic regions of 43 PCGs and 21 indels in 11 PCGs and SSU. The chloroplast genome sequence was deposited at GenBank (KX35265).
박미란(Miran Park),심재경(Jaekyung Shim),이재길(Jaekil Lee),권진욱(Jin Wook Kwon),임득재(Deukjae Im) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this paper, the compliance screw axes of multi-link, double wishbone, and McPherson type suspensions are found by using the analytical method using screw theory. The compliance screw axis is obtained by the linear combination of the twist axes which are obtained by releasing the constraint wrench that acts through each link. Static analysis is performed to find the coefficients of the linear combination. The compliance screw axes of the multi-link, double wishbone, and McPherson suspension are compared with the kinematic steering axes of the systems.
양극산화로 제조된 광어노드와 엔자임 고정화를 통한 광전기화학적 수소제조 연구
박민성(Park, Minsung),심은정(Shim, Eunjung),허아영(Heo, Ahyoung),윤재경(Yoon, Jaekyung),주현규(Joo, Hyunku) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
본 연구에서는 양극산화된 TiO₂ 전극(anodized tubular TiO₂ electrode, ATTE)을 수소제조용 PEC(Photoelectrochemical)시스템에서 광어노드와 기존의 백금전극을 대체하고 H^+ 환원능을 향상시키기 위하여 엔자임(Pyrococcus furiosus, Pfu)을 고정화한 후 캐소드로 동시에 활용하였으며, 엔자임 고정을 위한 crosslinker 종류 및 금속담지 여부, ATTE 길이를 통한 수소발생양에 미치는 영향을 연구하였다. ATTE 표면과 엔자임의 amine group의 연결을 위하여 heterobifunctional crosslinker로써 사슬 길이가 상대적으로 짧은 Sulfo-SDA가 유리하였으며, 금속담지의 경우 짧은 튜브의 경우 1% 내에서 효과가 증진되었으나 긴 튜브의 경우는 오히려 광전류 및 궁극적으로 수소발생속도에 불리하게 작용하였다. 또한, 튜브 길이가 긴 ATTE가 짧은 ATTE 보다 수소발생양에서 더욱 효율적임을 알 수 있었다. 텅스텐산화물 담지의 가시광감응에의 담지 효과는 예비 실험 결과로 나타나지 않아, 추가적인 연구가 필요한 것으로 판단된다.
조민석(Minseok Jo),심재경(Jaekyung Shim),곽승우(Seungwoo Kwak),임득재(Deukjae Im),나병철(Byungchul Na) (사)한국CDE학회 2014 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2014 No.2
Diesel fuel injectors work by transferring fuel from the supply line to the fuel injector device which is attached to each cylinder where it is pressurized and then sprayed through a small nozzle into the cylinder"s combustion chamber. While a diesel fuel injector working, the highly pressurized fuel inside the fuel passage can cause the stress and deformation of parts of the injector and by extension, it may be a cause of malfunction of the injector. In this paper, the stress distribution and deformation of a 2,000bar diesel fuel injector model2 are analyzed using finite element method and compared with model1 for suggestion of better design.