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( Liping ),( Kanzhang ),박종혁 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Surface carbon coating to improve the inherent poor electrical conductivity of lithium iron phosphate (LiFePO4, LFP) has been considered as most efficient strategy. Here, we also report one of the conventional methods for LFP, but exhibiting a specific capacity beyond the theoretical value, ultra-high rate performance, and excellent long-term cyclability: the specific capacity is 171.9 mAh/g (70 μm-thick electrode with ~10 mg/cm2 loading mass) at 0.1 C (17 mA/g), and retains 143.7 mAh/g at 10 C (1.7 A/g) and 95.8 % of initial capacity at 10 C after 1000 cycles. It was found that the interior conformal N-C coating enhances the intrinsic conductivity of LFP nanorods (LFP NR) and the exterior RGO coating acts as an electrically conducting secondary network to electrically connect the entire electrode. The great electron transport mutually promoted with shorten Li diffusion length on (010) facet exposed LFP NR represents the highest specific capacity value recorded to date at 10C and ultra-long-term cyclability. This conformal carbon coating approach can be a promising strategy for the commercialization of LFP cathode in lithium ion batteries.
Liping Chen,Xiaomin Li,Xiang Li,Min Zhu,Ranchao Wu,António M. Lopes 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.11
This work investigates the guaranteed cost leader-following consensus of a class of uncertain fractionalorder (FO) multi-agent systems (FOMASs) affected by state time delay. The leader and following group are exposed to norm-bounded time-varying parametric uncertainty and time-delay. A delay- and order-dependent consensus protocol is developed which guarantees robust stability of the controlled system and ensures that the effect of uncertainty on the system performance is below some prescribed index. The FO Razumikhin theorem and the linear matrix inequality approach are adopted to derive the method that can be applied to FOMASs with deterministic parameters. The analysis can be extended to distinct consensus problems for different types of FOMASs. Three numerical examples illustrate the effectiveness and feasibility of the approach.
Liping Liang,Chenlu Wang,Hongfang Wang,Haihua Zhan,Xu Meng 한국섬유공학회 2018 Fibers and polymers Vol.19 No.9
The cotton fabric was modified with dopamine methacrylamide (DMA) based on mussel-inspired reaction and polymerized with zwitterionic sulfobetaine methacrylate (SBMA) through free radical polymerization reaction. The poly(DMA-SBMA) contained not only key chemical constituents of dopamine hydrochloride, which strongly adsorbed to fabric substrates, but also hydrophilic groups, providing a hydrophilic surface for fabric due to its strong interaction with water via electrostatic interactions. The chemical structure, surface topography, and surface wettability of the fabric were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and contact angle experiments, respectively. The results showed that the water contact angle (WCA) of the treated fabric was ~0 o, whereas the underwater oil contact angle (OCA) was ~161 o, as compared to ~25 o for the control one. It is expected that as-prepared fabrics could be applied in oil/water separation due to such special superhydrophilicity and superoleophobicity.
Image Deblocking Scheme for JPEG Compressed Images Using an Adaptive-Weighted Bilateral Filter
( Liping Wang ),( Chengyou Wang ),( Wei Huang ),( Xiao Zhou ) 한국정보처리학회 2016 Journal of information processing systems Vol.12 No.4
Due to the block-based discrete cosine transform (BDCT), JPEG compressed images usually exhibit blocking artifacts. When the bit rates are very low, blocking artifacts will seriously affect the image`s visual quality. A bilateral filter has the features for edge-preserving when it smooths images, so we propose an adaptiveweighted bilateral filter based on the features. In this paper, an image-deblocking scheme using this kind of adaptive-weighted bilateral filter is proposed to remove and reduce blocking artifacts. Two parameters of the proposed adaptive-weighted bilateral filter are adaptive-weighted so that it can avoid over-blurring unsmooth regions while eliminating blocking artifacts in smooth regions. This is achieved in two aspects: by using local entropy to control the level of filtering of each single pixel point within the image, and by using an improved blind image quality assessment (BIQA) to control the strength of filtering different images whose blocking artifacts are different. It is proved by our experimental results that our proposed image-deblocking scheme provides good performance on eliminating blocking artifacts and can avoid the over-blurring of unsmooth regions.
Differential Dual-Frequency Antenna for Wireless Communication
Liping Han,Wenmei Zhang,Guorui Han,Runbo Ma,Li Li 한국전자통신연구원 2008 ETRI Journal Vol.30 No.6
A novel differential dual-frequency antenna using proximity coupling is proposed. Dual bands are realized by a slot in the ground plane. The lower resonant frequency is controlled by the slot in the ground plane, and the upper resonant frequency is mainly determined by the dimensions of the radiating patch. Measured results show that the proposed antenna can operate at 2.51 GHz and 5.38 GHz.
Liping Guo,윤우영,Bok Ki Kim 대한금속·재료학회 2012 ELECTRONIC MATERIALS LETTERS Vol.8 No.4
This paper presents the fabrication and testing results of a Silicon-Carbon nanocomposite material used for lithium secondary batteries which was prepared through the pyrolysis of alginic acid which was utilized as the carbon source. Silicon nanoparticles were mixed with alginic acid which was first dissolved in a Na2CO3solution. After drying, the blend was ground into powders and heated in an argon atmosphere. Based on Raman spectra, the ordering of the carbon from the decomposition of the carbon source was clearly distinguished. The reversible specific discharge capacity of silicon in the electrode of this composite material was as high as 1928 mAhg−1, which indicates excellent cycling stability.
Liping Li,Daoyi Wu,Min He 한국섬유공학회 2020 Fibers and polymers Vol.21 No.3
The surface of carbon fiber (CF) was modified by the electrophoretic deposition of cationic chitosan (CS), whichis expected to enhance the hygrothermal and mechanical properties of carbon fiber/polyamide 6 (CF/PA 6) composites. Carbon fiber in various treatment stages was characterized by Fourier transform infrared spectroscopy, X-ray photoelectronspectroscopy, scanning electron microscopy, atomic force microscopy, and X-ray diffraction. The studies demonstrate that thechitosan-modified carbon fiber (CS-CF) increases the surface chemical activity and roughness of carbon fiber, whichenhances the chemical bonding and mechanical interlocking of carbon fiber with PA 6. Compared with desized carbon fiber(D-CF), the O/C composition ratio of CS-CF increased from 20.34 % to 50.86 %, and the tensile strength and flexuralstrength of the CS-CF/PA 6 composites were enhanced by 50.31 % and 43.88 %, respectively. In addition, the hygrothermalproperties of CS-CF/PA 6 were also improved. Fracture observation of the composite cross-sections further elucidates themechanism of interfacial strengthening.
Robust Finite Time Stability of Fractional-order Linear Delayed Systems with Nonlinear Perturbations
Liping Chen,Yigang He,Ranchao Wu,Yi Chai,Lisheng Yin 제어·로봇·시스템학회 2014 International Journal of Control, Automation, and Vol.12 No.3
This letter is concerned with robust stability of fractional-order linear delayed system with nonlinear perturbations over finite time interval. By using inequality technique, two new sufficient conditions for the finite time stability for such systems with order and are presented, respectively. A numerical example is presented to demonstrate the validity and feasibility of the obtained results.