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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.
High Efficient Consistency Maintenance Strategy of Real-time String Text Editing Systems
Liping Gao,Wenfeng Tang 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.10
The idea of address space transformation provides a new way for concurrency control. During concurrent processing, it retraces the document status back to the state when the operations are generated to maintain consistency. However the previous concurrency processes strategy is based on single characters, the transmission cost during processing is too high, especially when the network is unstable. Due to this problem, this paper presents a consistency maintenance strategy based on string editing operations, and proposes the string splitting mechanism combined with the idea of the address space transformation in order to maintain consistency.
Identifying SDC-Causing Instructions Based on Random Forests Algorithm
( Liping Liu ),( Linlin Ci ),( Wei Liu ),( Hui Yang ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.3
Silent Data Corruptions (SDCs) is a serious reliability issue in many domains of computer system. The identification and protection of the program instructions that cause SDCs is one of the research hotspots in computer reliability field at present. A lot of solutions have already been proposed to solve this problem. However, many of them are hard to be applied widely due to time-consuming and expensive costs. This paper proposes an intelligent approach named SDCPredictor to identify the instructions that cause SDCs. SDCPredictor identifies SDC-causing Instructions depending on analyzing the static and dynamic features of instructions rather than fault injections. The experimental results demonstrate that SDCPredictor is highly accurate in predicting the SDCs proneness. It can achieve higher fault coverage than previous similar techniques in a moderate time cost.
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.
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.
Assessing containment properties of underground oil storage caverns: methods and a case study
Liping Qiao,Zhechao Wang,Shucai Li,Liping Bi,Zhenhao Xu 한국지질과학협의회 2017 Geosciences Journal Vol.21 No.4
One of the most important issues in the construction of underground water-sealed oil storage caverns is the assessment of their containment properties. These properties depend on the hydrogeological condition and also engineering characteristics of the caverns. Conceptual hydrogeological model for assessing the containment properties of underground water-sealed oil storage caverns was developed. Empirical, numerical and experimental methods for assessing the containment properties were summarized. A principle for the selection of assessment methods was proposed for engineering application. It was proposed that the selected assessment method should be appropriate for the investigation stages, the research objectives and the parameters which have been determined. A five-stage flowchart for the assessment of containment properties of underground water-sealed oil storage caverns was developed. The set of assessment methods was applied to a pilot underground water-sealed oil storage facility in China. Empirical methods, fracture network method and field test methods were presented for the assessment of the containment properties of the cavern, while the other methods were introduced in previous studies.
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.
Fault Detection and Diagnosis for Delay-Range-Dependent Stochastic Systems Using Output PDFs
Liping Yin,Pengwei Zhu,Tao Li 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.4
This paper investigates a new fault detection and diagnosis(FDD) scheme for delay-range-dependentstochastic systems. Compared with classical FDD problem, the measurable information in this paper is supposedto be the output probability density function(PDF), rather than the output itself. By using the square root B-splineapproximation technique, the dynamic weight model of the output PDFs is established and the considered problemis converted into a nonlinear FDD problem for stochastic systems with delays. The main objective of this paper isto construct a filter based residual generator such that the fault can be detected and estimated. The FDD criteria isprovided on the basis of linear matrix inequalities(LMIs). Besides, to improve the FDD performance, the tuningparameters, slack variables as well as the free-weighting matrices are applied to optimize the FDD criteria. Finally,the simulations are given to demonstrate the effectiveness of the proposed method.
Boundary Output Feedback Stabilization of the Linearized Schrödinger Equation with Nonlocal Term
Liping Wang,Feng-Fei Jin 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.4
In this paper, we are concerned with the boundary output feedback stabilization problem of a Schrödingerequation with a nonlocal term. Firstly, we design an explicit boundary state feedback controller by backsteppingapproach. Under this controller, the closed-loop system is proved to be exponentially stable from the equivalencebetween the original system and the target system. Then, we propose an observer-based output feedback controllerby replacing the state in state feedback controller with its estimation. The resulting closed-loop system admitsa unique solution which is exponentially stable. Finally, some numerical examples are presented to illustrate theeffectiveness of the proposed feedback controller.