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A Robust Direction-selectable Edge-based Panel Cutting-Line Detection Algorithm
Wei Li(이위),Hakil Kim(김학일),Cheng-Bin Jin(김성빈),Mingjie Ma(마명걸),Qiongxiu Li(이경수),Jong-Hee Kim(김종희),Xuenan Cui(최학남) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6
This paper proposes three robust detection algorithms for locating the cutting line in an image captured by a panel-cutting system. All of the proposed methods contain two stages: edge detection and line fitting. A designed step-edge operator is applied to detect edges in the search direction of interest depending on the intensity concentration. Meanwhile, the proposed line-fitting algorithm is able to precisely fit a line by minimizing the summation of L1 distance from each detected edge point to the fitted line. As the result, all of the proposed methods achieve accuracy of more than 85%. Going one step further, full-scale edge detection (FSED) obtains the best performance at 99.05%, which is evaluated by using a variety of real-world images.
Mingjie Shao,Wenke Liu,Lingyan Zha,Chengbo Zhou,Yubin Zhang,Baoshi Li 한국원예학회 2020 Horticulture, Environment, and Biotechnology Vol.61 No.6
This study investigated the eff ects of constant light and alternating relatively high-intensity (500 μmol m −2 s −1 ) and lowintensity(150 μmol m −2 s −1 ) red–blue LEDs (4R:1B) on the biomass production and quality of hydroponic purple-leaf lettuce( Lactuca sativa L. cv. ‘Zishan’) in an environmentally controlled plant factory. Four treatments were set up to separate1 h of high light into four diff erent alternating frequencies in a 24-h light−dark cycle (16/8 h): one time (A1), three times(A3), six times (A6), and twelve times (A12). In addition, one constant light treatment with the same daily light integral(DLI, 9.8 mol m −2 per day) as other treatments was set as the control (CK, 170 μmol m −2 s −1 ). The results indicated thatA6 signifi cantly reduced shoot fresh weight and increased the root–shoot ratio of lettuce compared with CK, but there wasno signifi cant diff erence among other treatments. Alternating light treatments did not promote the accumulation of solublesugar, soluble protein, and phenolic substances compared with CK. Meanwhile, A12 signifi cantly promoted the accumulationof total ascorbate (TA) in lettuce leaves compared with other treatments but decreased ascorbate/TA ratio. Above all, underthe same DLI condition, alternating high and low light did not have obvious positive eff ects on biomass production and theaccumulation of nutrient substance in lettuce under constant light was better than that under alternating light. Therefore,compared with the fl uctuating radiation with the same DLI, constant radiation is a better choice for lettuce production.
성별에 따른 초등학생의 가정폭력 경험과 공격성이 학교폭력 가해행동에 미치는 영향
Li Mingji,오인수(Oh, Insoo) 이화여자대학교 교육과학연구소 2017 교육과학연구 Vol.48 No.3
The present study aimed to investigate whether the experience of domestic violence influenced school violence behavior through aggression. In addition, it also examined if the effect of aggression on school violence behavior is moderated by ego-resiliency. The subjects were 463 elementary school students in 4<SUP>th</SUP>, 5<SUP>th</SUP> and 6<SUP>th</SUP> grades in urban and suburban areas. As a result, the effect of the experience of domestic violence on school violence behavior was mediated by aggression. The relationship between aggression and school violence behavior was moderated by ego-resiliency. In addition, ego-resiliency was found to be moderate the mediating effect of aggression, but the moderated mediation effect was valid only in male students. Taken together, the experience of domestic violence positively affects the aggression, thus increasing school violence behavior. However, the level of ego-resiliency moderated the effect of aggression on school violence behavior among male students. Implications for educational and counseling interventions in school violence behavior were discussed based on the results.
Analysis of a Novel Double-Stator and Dual-PM Toroidal-Winding Linear Vernier Machine
Wang Mingjie,Ye Pengxiang,Li Yanyan,Liu Sheng 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.4
Aiming at the problem of low thrust density and large thrust ripple of conventional permanent magnet linear machine, this paper proposes a novel structure of double-stator and dual-PM toroidal-winding linear vernier machine (LVM) with high thrust density and low thrust ripple. The novelty of the proposed machine is adopted double-sided topology, toroidal-winding and permanent magnets (PMs) installed both on the stator side and the mover split teeth to improve thrust density. To emphasize the specificity of proposed dual-PM LVM in aspect of electromagnetic performance, three kinds of conventional LVMs with different topologies are compared with proposed machine by analyzing the air-gap flux density, inductance, no-load EMF, thrust, overload capability and power factor of the machines. The average thrust is increased by 11.5% under rated current, and the thrust ripple is decreased from 22.1 to 2.68% by optimizing the key parameters of the proposed structure. The harmonics contribution of EMF and thrust are discussed by semi-analytical method. The results of the semi-analytical method are in good agreement with the finite element method, which verifies the correctness of the semi-analytical method and proves that the proposed machine has good performance characteristics.