http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Surface reconstruction from unorganized points with <i>l</i> <sub>0</sub> gradient minimization
Li, Huibin,Li, Yibao,Yu, Ruixuan,Sun, Jian,Kim, Junseok Elsevier 2018 Computer vision and image understanding Vol.169 No.-
<P><B>Abstract</B></P> <P>To reconstruct surface from unorganized points in three-dimensional Euclidean space, we propose a novel efficient and fast method by using <I>l</I> <SUB>0</SUB> gradient minimization, which can directly measure the sparsity of a solution and produce sharper surfaces. Therefore, the proposed method is particularly effective for sharpening major edges and removing noise. Unlike the Poisson surface reconstruction approach and its extensions, our method does not depend on the accurate directions of normal vectors of the unorganized points. The resulting algorithm is developed using a half-quadratic splitting method and is based on decoupled iterations that are alternating over a smoothing step realized by a Poisson approach and an edge-preserving step through an optimization formulation. This iterative algorithm is easy to implement. Various tests are presented to demonstrate that our method is robust to point noise, normal noise and data holes, and thus produces good surface reconstruction results.</P> <P><B>Highlights</B></P> <P> <UL> <LI> With l0 gradient minimization, a fast and efficient surface reconstruction method is proposed. </LI> <LI> Our method is particularly effective for sharpening major edges and removing noises. </LI> <LI> Our method does not depend on the accuracy of normal vectors of the unorganized points. </LI> </UL> </P>
Experimental verification of the effect of human lower extremity exoskeleton
Yang Li,Cheng Xu,Xiaorong Guan,Zhong Li,Huibin Li 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.8
A human lower extremity exoskeleton (HLEE) has been designed in our previous works, in which a simulation study has also been performed. However, verifying the effect of HLEE is still a problem. Accordingly, an experimental method combining a data collection system and a human motion capture system is proposed to solve this issue. Experimental data on the moment of momentum and energy provided to the HLEE knee joint and the knee joint angle deviation between the human body and HLEE exhibit good assistance effect. Moreover, the man-machine coordination and environmental suitability of the designed HLEE experimental prototype are validated in this study.
Design and control of extractive distillation for the separation of methyl acetate-methanol-water
Honghai Wang,Pengyu Ji,Huibin Cao,Weiyi Su,Chunli Li 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.12
The azeotrope of methyl acetate methanol and water was isolated using extractive distillation with water as entrainer. The pressure-swing extractive distillation (PSED) process and vapor side-stream distillation column (VSDC) with the rectifier process were designed to separate the methyl acetate, methanol and water mixture. It was revealed that the VSDC with the rectifier process had a reduction in energy consumption than the PSED process. Four control schemes of the two process were investigated: Double temperature control scheme (CS1), QR/F feedforward control of reboiler duty scheme for PESD (CS2), QR/F feedback control scheme for VSDC (CS3), the feedback control scheme of sensitive plate temperature of side-drawing distillation column to dominate the compressor shaft speed (CS4). Feed flow and composition disturbance were used to evaluate the dynamic performance. As a result, CS4 is a preferable choice for separation of methyl acetate-methanol-water mixture. A control scheme combining the operating parameters of dynamic equipment with the control indicators of static equipment was proposed in this paper. It means using the sensitive plate temperature of side-drawing column to control the compressor shaft speed. This is a new control scheme for extractive distillation
In Situ Synthesis and Strengthening of Powder Metallurgy High Speed Steel in Addition of LaB6
Weijun Shen,Linping Yu,Zhi Li,Yuehui He,Qiankun Zhang,Huibin Zhang,Yao Jiang,Nan Lin 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.6
A novel technology which was characterized by the vacuum solid state sintering was developed for powder metallurgyhigh speed steels production. During sintering, both the WC and Mo2C reacted with Fe and transformed toW and Mo rich M6C carbides which were the common hard phases in high speed steels. Also, a high number of W,Mo and Fe were dissolved in VC, forming the MC carbides. The densification of the material mainly relied on thesolubility effect during the M6C and MC carbides formation. By alloying with a 0.1 wt% of LaB6 to the steel, thebending strength and the fracture toughness were improved from 3290 MPa and 25.6 MPam1/2to 4018 MPa and29.4 MPam1/2, respectively. The TEM analysis demonstrated three types of reaction products by the LaB6 addition:the amorphous phase, the core-shell structure and the La2O3 phase. The impurity elements such as the Mg, Al,Si, S, Ca, and O were absorbed following the LaB6 addition. Moreover, the deoxidization effect caused by the LaB6addition promoted the sintering at a high-temperature period which contributed to the bending strength and fracturetoughness improvement.