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- 저자 : Jili Wang (검색결과 5 건)
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Wang Jili,Ushirozako Hiroki,Yamato Yu,Ide Koichiro,Hasegawa Tomohiko,Yoshida Go,Banno Tomohiro,Oe Shin,Arima Hideyuki,Mihara Yuki,Watanabe Yuh,Nakai Keiichi,Kurosu Kenta,Hoshino Hironobu,Matsuyama Yuk 대한척추외과학회 2023 Asian Spine Journal Vol.17 No.2
Study Design: A retrospective cohort study.Purpose: Our aim is to investigate the relationship between degenerative lumbar scoliosis (DLS), and whole-body alignment, including spinopelvic and lower extremity alignments. Overview of Literature: DLS is a deformity commonly associated with aging. However, the correlation between whole-body alignment and DLS remains controversial.Methods: Adult volunteers aged over 50 years were included in the study after participating in the screening program. Characteristic data and standing radiographic parameters were assessed. A propensity score model was established with adjustments for age and sex after a preliminary analysis, and cases were divided into DLS (Cobb angle >10°) and non-DLS (Cobb angle ≤10°) groups.Results: There were significant differences in age, sex, C2 sagittal vertical axis (C2-SVA), C7-SVA, T1 pelvic angle (TPA), lumbar lordosis (LL), pelvic incidence (PI), pelvic tilt (PT), PI minus LL (PI–LL), knee angle, ankle angle, pelvic shift, C7-center sacral vertical line, L4 tilt, femur-tibia angle, and hip-knee-ankle angle (all p <0.05) using a preliminary analysis of 261 cases (75 DLS and 186 non-DLS). A one-to-one propensity score-matched analysis was used after 70 pairs of cases were selected. There were no significant differences in the characteristic data for lower extremity parameters. There were still significantly higher values of C2-SVA, TPA, PI, PT, and PI–LL in DLS group than in non-DLS group (all p <0.05).Conclusions: This study showed an important relationship between DLS and sagittal spinal deformity. However, DLS was not associated with the sagittal and coronal lower extremity alignments.
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Optimizing opportunistic preventive maintenance strategy for multi-unit system of CNC lathe
Yue Wu,Zhaojun Yang,Jili Wang,Xiaojuan Chen,Wei Hu 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.1
Due to the many components in the multi-unit system (i.e., CNC machine tools), the existing preventive maintenance (PM) strategies conducting independent PM for every component are time-consuming and waste unnecessary maintenance and downtime costs. Hence, this paper introduces the idea of opportunistic maintenance into the PM and proposes an opportunistic imperfect PM approach, which is a more realistic PM policy for a multi-unit system. In this approach, the effect of PM is assumed to be imperfect to correct the failure rate of each unit. According to the corrected failure rate function, the imperfect PM strategy of a single unit is optimized by minimizing the proposed unit maintenance cost rate under the limitation of minimum reliability. Then, these independent imperfect PM strategies for units are rescheduled by the proposed opportunistic PM strategy under the condition of judging the reliability OM threshold of units. We further optimize the opportunistic PM strategy by minimizing the total maintenance cost. Finally, the advantage of our approach is verified by the case study of 18 CNC lathes.
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Zhu Kai,Xu Jili,Wang Xiangyu 서울시립대학교 도시과학연구원 2023 도시과학국제저널 Vol.27 No.3
Urban innovation space functions not only as physical carriers for innovative activities but also as coordinating entities for balancing innovation production and talents’ living demands in the city. However, existing studies pay inadequate attention to the demand side of high-skilled talents who build urban innovation space. This paper, therefore, focuses on the evolution of urban innovation space and its spatial relationships with supporting factors (i.e. high-tech enterprises, intellectual carriers, public transportation, commercial facilities) satisfying talents’ living demands in Hangzhou, China. It is found that the urban innovation space in Hangzhou has evolved from a monocentric pattern towards a polycentric one, which is coined as ‘one main core, three sub-cores and six groups’. The spatial agglomerations of high-tech enterprises reflect the recent expansion trends of urban innovation space. The intellectual carriers have intensified a high-level spatial agglomeration of innovation in central and peripheral urban areas. Transportation conditions operate to enhance the agglomeration and selective dissemination of urban innovation space along key traffic corridors. Urban innovation space is primarily located within the service scope of business and commercial facilities. In short, the four supporting factors spatially match well with the urban innovation space in Hangzhou at present, which contributes to sustainable innovation and people-oriented urban development.
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Shijun Ji,Chengxin Jiang,Ji Zhao,Jilong Yang,Jili Wang,Handa Dai 한국물리학회 2019 Current Applied Physics Vol.19 No.11
In this paper, a dual-band metamaterial absorber (MMA) with wide-angle and polarization-insensitivity is proposed. The MMA consists of two copper layers with a layer of FR-4 between them. And its top layer consists of a cross-shaped resonator and a square ring resonator. The calculation result demonstrates that there are two distinct absorption peaks, whose absorptivity are 99.933% at 3.8441 GHz and 99.99% at 9.1094 GHz. And its thickness is only 1.34% of the wavelength of the lowest absorption frequency. The dual-band MMA shows polarization-insensitivity for normal incident wave and shows high absorptivity in a wide incident angle for both TE and TM polarization wave. In addition, we discuss the working mechanism. The influences of main parameters on the dual-band MMA's absorption are also analyzed. The proposed ultra-thin MMA has simple structure and high absorptivity, which has many potential applications, such as thermal radiometer, detection sensor, stealth technology.
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