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Zixu Guo,Ziyuan Song,Dawei Huang,Xiaojun Yan 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.12
In this study, in the respect of rafting behavior of Ni-based single crystal (SC) superalloy under creep and thermal mechanicalfatigue (TMF), an image processing program is developed to investigate the probability characteristic of γ channel width, anda channel width evolution model considering non-quasi-static modification is proposed. Firstly, the fractured and interruptedtests are conducted on SC superalloy. The channel width evolution behavior under different load conditions is observed viascanning electron microscope. Then, an image processing program based on image binarization is developed to conductstatistics on channel width. The statistical results show that the stress and temperature have significant effects on raftingrate, while the phase difference has a small effect. Meanwhile, the channel width obeys lognormal distribution, and the meanvalues follow linear relationship with standard deviations. In the modeling part, a static model is established to predict themean value evolution of channel width under creep condition. To be generalized to TMF condition, the model is modifiedby considering the non-quasi-static effect. After that, the channel width evolution model is further derived to describe theprobability density distribution of channel width. The predicted channel width evolutions are in good agreement with theexperimental results. The statistical results and models can provide the basis for multiscale modeling of SC superalloy.
A Study on 360° Image Production Method for VR Image Contents
곽대위,정진헌,Guo, Dawei,Chung, Jeanhun The Society of Digital Policy and Management 2017 디지털융복합연구 Vol.15 No.12
360도 이미지는 대중에게 이전에 경험하지 못했던 특별한 시각적 경험을 제공한다. 360도 이미지를 제작할 수 있는 방법은 여러 가지가 있지만, 본 논문에서는 기존의 제작방식을 포함하여 간단하며 유효한 두 가지의 제작방법을 제시하고자 한다. 첫 번째 방법으로는 48장의 이미지를 합성하여 한 장의 360도 이미지를 만드는 것이고, 두 번째 방법으로는 6장의 이미지를 사용하여 한 장의 360도 이미지를 제작하는 것이다. 앞서 제시한 두 가지 제작 방식의 특징과 장단점의 비교를 통하여 더욱 간단하면서도 효율적인 제작방식을 선택할 수 있다. 소개를 통하여 제시되는 제작방법은 VR작품 제작의 문턱을 낮출 수 있으며, 일반인들도 360이미지 제작을 더욱 간편하게 할 수 있게 됨으로써 VR영상 콘텐츠 산업이 더욱 발전될 수 있을 것으로 기대한다. $360^{\circ}$panoramic image can give people an unprecedented visual experience, and there are many different ways to make a $360^{\circ}$panoramic image. In this paper, we will introduce two easy and effective methods from those many ways. The first one is through 48 photos to make a $360^{\circ}$panoramic image, the second way is through 6 photos to make a $360^{\circ}$panoramic image. We will compare those methods and tell the audience which one suits themselves. Through those easy design methods introduced above, we can see VR works design became easy and popular, normal people can also make $360^{\circ}$panoramic image, and it promotes the industry of VR image contents.
Fu, Dejun,Wu, Dawei,Zhang, Zhihong,Meng, Xianquan,He, Mengbing,Guo, Huaixi,Peng, Yougui,Fan, Xiangjun The Korean Vacuum Society 1998 Applied Science and Convergence Technology Vol.7 No.1
We prepared $C_3N_4$ films by rf plasma enhanced chemical vapor deposition(PCVD) and alternating $C_3N_4$/TiN composite films by dc magnetron sputtering. X-ray diffraction (XRD) and transmission electron diffraction (TED) revealed that the structure of the films is amorphous or polycrystalline, depending on deposition conditions and heat treatment. X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) spectroscopy confirmed the presence of $sp_3\; and sp _2$ hybridized C atoms bonded with N atoms in the tetrahedral and hexagonal configurations, respectively. Graphite-free $C_3N_4$ films were obtained by PCVD under optimal conditions. To prepare well crystallized $C_3N_4$ films by magnetron sputtering, we introduced negatively biased gratings in the sputtering system. CN films deposited at grating voltages (Vg) lower than 400V are amorphous. Crystallites of cubic and $\beta$-$C_3N_4$ were formed at increased voltages.
Shu Jiang,Jing Yang,Dawei Qian,Jianming Guo,Er-xin Shang,Jin-ao Duan,Jun Xu 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.2
Ultra performance liquid chromatography/quadrupole-time-of-flight mass spectrometry (UPLC/Q-TOF MS)technique combined with MetabolynxTM software was usedfor analysis of the metabolites of quercitrin by the isolatedhuman intestinal bacteria from the human feces. Four metabolitesof quercitrin were detected and tentatively identifiedbased on the characteristics of their protonated ions. Themetabolites were metabolized by four main metabolic pathwaysincluding hydroxylation, demethylation, deglycosylationand ring-cleavage. Quercitrin was metabolized to the hydroxyquercitrinand desmethylquercitrin by themajority of theisolated intestinal bacteria such as Bacteroides sp. 54, and wasdegraded to the deglycosylated product quercetin by rhamnosidaseand further ring-cleavage metabolite 3,4-dihydroxybenzoicacid by the minority of the isolated bacteria such asBacteroides sp. 45. The metabolic pathways and most of themetabolites of quercitrin were reported for the first time.
Development of a Novel 3-DOF Suspension Mechanism for Multi-Function Stylus Profiling Systems
Jia Tian,Yanling Tian,Zhiyong Guo,Fujun Wang,Dawei Zhang,Xianping Liu,Bijian Shirinzadeh 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.11
This paper proposes a novel 3-DOF suspension mechanism for multi-function stylus profiling systems. Incorporating an electromagnetic force actuator, the 3-DOF suspension mechanism provides a controlled loading force. For reasons of the thermal and mechanical stability, a triangular flexure structure is utilized to support the stylus. The stiffness matrix method is used to establish the analytical stiffness model of the 3-DOF suspension mechanism. Considering the 3-DOF suspension mechanism as a 3-DOF lumped-mass-spring system, the dynamic model is established. Finite element analysis (FEA) is used to validate the established static and dynamic models of the 3-DOF suspension mechanism. A prototype is fabricated and experimental tests are carried out to characterize the mechanism’s performance. The results show that the 3-DOF suspension mechanism provides a controlled force in a range of up to 10 mN and has a working range in excess of 10 μm with a first natural frequency of 342 Hz in Z axis, indicating good capability for multi-function measurements at the micro/nano scale.
Fuhui Cui,Junjie Wang1,Xiangdong Gan,Dawei Yu,Ilya Vladimirovich Okulov,Qinghua Tian,Xueyi Guo 대한금속ᆞ재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
Liquid Mg is capable of quickly eroding the refractory Ni-based superalloy and selectively dissolve Ni, which opens up anew avenue for the recycling of superalloy scraps for comprehensive metal reclamation. This study aims at investigating theunderlining mechanism and kinetics of the selective dissolution of Ni from Inconel 718 (one type of Ni-based superalloy)with liquid Mg, by experimenting at 750, 800, and 850 °C for various amounts of time in an inert atmosphere. This selectivedissolution process is also known as liquid metal dealloying. Results show that a permeable dealloyed layer was formedresulting from the preferential dissolution of Ni over other metallic elements (e.g., Fe, Cr, Nb, Mo, and Ti). At the dealloyingforefront, the grain boundaries of the matrix γ phase were preferentially eroded by liquid Mg. The opposite concentrationgradients of Ni (4–9 wt%) and Mg (12–18 wt%) cross the dealloyed layer suggested their counter diffusion. A higher heatingtemperature substantially increased the dealloying rate.