http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Weixing Song (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
Change Detection Algorithm on Wavelet and Markov Random Field
Song Hongxun,Wang Weixing,Zhang Tingting,Yu Tianchao,Song Junfang 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.4
In this study, the algorithm that applies Wavelet and multi-scale analysis to remote sensing images is proposed for region variation detection on Markov random field. First of all, the Wavelet transform is adopted to decompose an original image into several sub-images, then the Mahalanobis distance decision function is used to detect the changes in different scale images, and finally the Markov random field is applied to fuse the change detection results at different scales. Since the Markov random field fusion method takes full account of the correlation between the adjacent pixels and the links of the change detection results at different scales, the fusion results are accurate and practical. The testing results prove that the studied algorithm is effective and robust.
-
Pavement Crack Detection by Ridge Detection on Fractional Calculus and Dual-thresholds
Song Hongxun,Wang Weixing,Wang Fengping,Wu Linchun,Wang Zhiwei 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.4
In this paper, a new road surface crack detection algorithm is proposed; it is based on the ridge edge detection on fractional calculus and the dual-thresholds on a binary image. First, the multi-scale reduction of image data is used to shrink an original image to eliminate noise, which can not only smooth an image but also enhance cracks. Then, the main cracks are extracted by using the ridge edge detection on fractional calculus in a grey scale image. Subsequently, the resulted binary image is further processed by applying both short and long line thresholds to eliminate short curves and noise for getting rough crack segments. Finally the gaps in cracks are connected with a curve connection function which is an artificial intelligence routine. The experiments show that the algorithm for pavement crack images has the good performance of noise immunity, accurate positioning, and high accuracy. It can accurately locate and detect small and thin cracks that are difficult to identify by other traditional algorithms.
-
Zinc Oxide-Enhanced Piezoelectret Polypropylene Microfiber for Mechanical Energy Harvesting
Zhu, Jianxiong,Zhu, Yali,Song, Weixing,Wang, Hui,Gao, Min,Cho, Minkyu,Park, Inkyu American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.23
<P>This paper reports zinc oxide (ZnO)-coated piezoelectret polypropylene (PP) microfibers with a structure of two opposite arc-shaped braces for enhanced mechanical energy harvesting. The ZnO film was coated onto PP microfibers via magnetron sputtering to form a ZnO/PP compound structure. Triboelectric Nanogenerator (TENG) based on ZnO/PP microfiber compound film was carefully designed with two opposite arc-shaped braces. The results of this study demonstrated that the mechanical energy collection efficiency of TENG based on piezoelectret PP microfiber was greatly enhanced by the coated ZnO and high-voltage corona charging method. We found that, with the step-increased distance of traveling for the movable carbon black electrode, an electrical power with an approximately quadratic function of distance was generated by this mechanical-electrical energy conversion, because more PP microfibers were connected to the electrode. Further, with a full contact condition, the peak of the generated voltage, current, and charges based on the ZnO/PP microfibers by this mechanical-electrical energy conversion with 1 m/s<SUP>2</SUP> reached 120 V, 3 μA, and 49 nC, respectively. Moreover, a finger-tapping test was used to demonstrate that the ZnO/PP microfiber TENG is capable of lighting eight light-emitting diodes.</P> [FIG OMISSION]</BR>
-
Low-Temperature Synthesis of Near-Monodisperse Globular MoS2 Nanoparticles with Sulphur Powders
Hui Wang,Xuequan Li,Kai Yan,유계성,Weixing Song,Ting Shen,Dechun Zou 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.8
Nanoparticles (NPs) with high uniformity have been extensively investigated for their excellent chemical stability. Near-monodisperse globular MoS2 NPs were prepared with sulphur powders (SPs) as a sulphur source by a one-pot polyol-mediated process without surfactants, transfer agents and toxic agents at 170–190 ℃. The as-processed SPs greatly affected the formation of the MoS2 NPs after low-activity sulphur (S8)n was reassembled from common SPs (S8). The average size of MoS2 NPs can be reduced remarkably from 100–200 nm to 50 nm by introducing low amounts of MnCl2. A preliminary four-step growth mechanism based on the aggregation-coalescence model was also proposed. This green and simple method may be an alternative to the common hot-injection and heating-up methods for the preparation of monodisperse NPs, particularly transition metal dichalogenides.
-
Zhu, Jianxiong,Guo, Xiaoyu,Meng, Dehuan,Cho, Minkyu,Park, Inkyu,Huang, Run,Song, Weixing The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.34
<P>In this paper, we report a flexible comb electrode triboelectric-electret coupling nanogenerator using a separated friction microfiber object for self-powered position, motion direction and acceleration tracking sensing and its energy harvesting. The power was generated from the coupling of the electrostatic and triboelectric effects among a separated triboelectric object, a polytetrafluoroethylene (PTFE) film and interdigital electrodes. Under an acceleration of 1 m s<SUP>−2</SUP>, we found that the corona charged PTFE film with a sliding motion reached ∼3 times more short-circuit current (<I>I</I>sc) and ∼6 times more open-circuit voltage (<I>V</I>oc) than the PTFE film without corona charges, respectively. The device can be a good self-powered acceleration tracking sensor, where the reasons were a stability voltage out during the process of separated components frictions and a numerical relationship of <I>I</I>sc with increased accelerations. Moreover, potential applications using several different separated materials such as a bulk of carbon microfibers, a finger sliding with a nylon glove, and water microdrops were used to show the energy harvesting of various friction materials and their effective contact area. It was found that a much larger contact area “finger” sliding showed a <I>V</I>oc of ∼45 V, whereas a smaller contact area “microdrop” sliding on the prototype presented a maximum peak <I>V</I>oc of ∼1.8 V.</P>
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
