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G. Zhang(장고기),Y. S. Kim(김용석),Y. J. Yum(염영진),S. Y. Yang(양순용) 유공압건설기계학회 2020 유공압건설기계학회 학술대회논문집 Vol.2020 No.7
In metal printing, repeated failures may occur due to the introduction of new equipment or workflow, unfamiliar manufacturing parameter adjustments, and manufacturing errors caused by lack of experience, resulting in insufficient technical accumulation. In addition, undesirable elements may be caused due to insufficient removal of unnecessary elements. By minimizing or optimizing these factors, the failure of trial and error can be reduced, and this failure can be largely eliminated by software simulation. This study was conducted to correct the SSF (strain scale factor) and ASC (anisotropic strain coefficient) factors to improve the accuracy of the simulation software in the additive manufacturing process of martensitic C300 powder materials. The study of this calibration follows the process of determining the SSF and ASC of ANSYS Additive Print software. Based on the previous research literature, the parameters (physical and mechanical properties) of the C300 powder material used for simulation were established, and the parameters of the equipment were used as the process parameters of the sample manufacturing equipment. The shape of the sample for simulation was made with a cantilever beam, and the sample was produced using PBF (Powder Bed Fusion) equipment of W company. The corrected SSF and ASC factors in this study improve the prediction accuracy of the deformation caused by the shape or thermal effect during the additive manufacturing of C300 powder materials and equipment in the simulation software, thereby will increasing the success rate of the additive manufacturing and, reducing the trial and error.
장양(Yang Zhang),염덕준(Deuk-Joon Yum),김동진(Dong-Jin Kim) 한국해양공학회 2015 韓國海洋工學會誌 Vol.29 No.3
In order to predict the motions of a planing hull in waves, it is necessary to accurately estimate the force components acting on the hull such as the hydrodynamic force, buoyancy, and friction, as well as the wave exciting force. In particular, based on strip theory, hydrodynamic forces can be estimated by the summation of the forces acting on each cross-section of the hull was mathematically developed by Zarnick, and his formula had been used to predict the vertical motions of prismatic planing hulls in regular waves. In this study, several improvements were added to Zarnick`s formula to predict the vertical motions of warped planing hulls. Based on calm water model test results, the buoyancy force and moment correction coefficient were modified. Further improvements were made I the pile-up correction. Pile-up correction factors were changed according to variations of the deadrise angles using the results found in previous research. Using the same hull form, captive model tests were carried out in other recent research, and the results were compared with present calculation results. The comparison showed reasonably good agreements between the model tests and present calculations.
Functionalized alkyne bridged dendron based chromophores for dye-sensitized solar cell applications
Baek, Nam Seob,Yum, Jun-Ho,Zhang, Xianxi,Kim, Hwan Kyu,Nazeeruddin, Mohammad K.,Grä,tzel, Michael Royal Society of Chemistry 2009 Energy & environmental science Vol.2 No.10
<P>We report the results of an investigation on the preparation, spectral and photoelectrochemical properties of alkyne bridged dendron chromophores with carboxylic acid anchoring group, which adhere effectively to nanocrystalline (anatase) TiO<SUB>2</SUB> surfaces yielding incident photon-to-current conversion efficiency values of up to 76% in their photocurrent action spectra, suggesting that the alkyne π-bridge functional moiety is an effective bridging group between chromophore and conduction band of the semiconductor.</P> <P>Graphic Abstract</P><P>Alkyne bridged dendron chromophores with carboxylic acid anchoring group exhibit superior incident photon-to-current conversion efficiency and enhanced red response compared to the alkene π-bridged chromophore. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b908670f'> </P>