REGENERATIVE BRAKING CONTROL STRATEGY OF ELECTRIC VEHICLES BASED ON BRAKING STABILITY REQUIREMENTS

Jiang Biao,Zhang Xiangwen,Wang Yangxiong,Hu Wenchao 한국자동차공학회 2021 International journal of automotive technology Vol.22 No.2

Electric vehicles are effective way to solve energy and environmental problems, but the promotion and application of electric vehicles are suppressed by their limited endurance range seriously. The regenerative braking technology is an important method to increase the endurance range of the electric vehicle. During the braking process, the kinetic energy of the electric vehicle can be converted into electric energy and stored in the energy source device with the regenerative braking system, so the endurance range of the electric vehicle can be increased accordingly. In order to increase the efficiency of energy recovery, a regenerative braking strategy with the optimization distribution algorithm is proposed in this paper, and the braking forces of the front and rear axles are distributed optimally with variable ratios based on the braking strength. With the optimal braking force distribution ratio and related constraint conditions, the regenerative braking control strategy was designed to meet the braking stability and the maximum braking energy recovery. And then a simulation model of the braking control strategy was built with MATLAB/Simulink software, and the simulation tests on UDDS and NEDC cycle conditions were done to verify the effectiveness of the designed regenerative braking control strategy. Compared with the control strategy of ADVISOR software, the braking energy recovery efficiency was improved more than 51.9 % while maintaining the braking stability.

Cloud Computing Security

Biao Jiang(장표),Eul Gyu Im(임을규) 한국통신학회 2011 한국통신학회 학술대회논문집 Vol.2011 No.6

A Survey of Anomaly-based Botnet Detection

Biao Jiang,Eul Gyu Im 한국통신학회 2011 한국통신학회 학술대회논문집 Vol.2011 No.2

Botnets are increasingly popular threats which endanger everyday life of both individuals and organizations. Information security experts have taken measures to cope. This survey specially focuses on the most important area of the defense against botnets -anomaly-based botnet detection. The survey first introduces basics of botnets and botnet defense, then provides an overview of anomaly-based botnet detection, and finally summarizes findings and predicts future trends of botnet detection.

Molecular Cloning and Expression of cDNA Encoding the Cysteine Proteinase Inhibitor from Upland Cotton

Ming-feng Jiang,Sheng-wei Li,Min Chen,Ying-fan Cai,Yong-fang Xie,Biao Li,Quan Sun,Huai-zhong Jiang,Zheng Pan,Yun-ling Gao,You-Lu Yuan,Yu-zheng Shi 한국식물학회 2009 Journal of Plant Biology Vol.52 No.5

A cDNA encoding a novel cysteine proteinase inhibitor (CPI) was isolated from a gland mutant Xiangmian-18 of upland cotton during the pigments gland forming stage. The cDNA comprises 378 bp and encodes 125 amino acid residues with molecular mass of 13.8 kDa. It contains the conserved motif of cysteine protease inhibitors and belongs to the cystatin superfamily (Gln- Val-Val-Ala-Gly). The deduced amino acid sequences of the domains are highly similar to the normal upland cotton (96.8%). SDS-PAGE and western hybridization analysis showed that the expressed recombinant protein was recombinant CPI. The inhibitory activity of recombinant CPI was 46 u/μg which was measured by inhibiting the protease activity of papain. RT-PCR results indicated that the expression level of developing gland stage was higher than that of undeveloped gland stage.

The impact of the convex friction distribution on the seismic response of a spring-friction isolation system

Biao Wei,Peng Wang,Xuhui He,Lizhong Jiang 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.4

As for structures with rubber bearings during earthquakes, some firstly damaged bearings and the other normal bearings form atypical spring-friction isolation system. Furthermore, a rough contact surface, due to the stochastic damage of bearing, and the aroundsmooth contact surfaces form a convex distribution of friction coefficient. This paper attempts to analyze seismic responses of aspring-friction isolation system with a theoretically and linearly convex friction distribution, in which the friction coefficientgradually decreases with the distance from the center. The results show that such friction distribution inevitably increases thestructural relative displacement and possibly enlarges the structural acceleration and residual displacement under earthquakes. Theconvex pattern of friction distribution should be avoided in practical engineering, since it reduces the seismic isolation efficiency.

Numerical calculation method for response of friction pendulum system when XY shear keys are sheared asynchronously

Biao Wei,Yunji Fu,Lizhong Jiang,Shanshan Li 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.81 No.5

When the friction pendulum system and shear keys work together to resist the ground motion ,which inclined inputs (non 45°) to the bridge structure, the shear keys in XY direction will be sheared asynchronously, endowed the friction pendulum system with a violent curvilinear motion on the sliding surface during earthquakes. In view of this situation, firstly, this paper abandons the equivalent linearization model of friction and constructs a Spring-Coulomb friction plane isolation system with XY shear keys, and then makes a detailed mechanical analysis of the movement process of friction pendulum system, next, this paper establishes the mathematical model of structural time history response calculation by using the step-by-step integration method, finally, it compiles the corresponding computer program to realize the numerical calculation. The results show that the calculation method in this paper takes advantage of the characteristic that the friction force is always , and creatively uses the "circle making method" to express the change process of the friction force and resultant force of the friction pendulum system in any calculation time step, which can effectively solve the temporal nonlinear action of the plane friction; Compared with the response obtained by the calculation method in this paper, the peak values of acceleration response and displacement response calculated by the unidirectional calculation model, which used in the traditional research of the friction pendulum system, are smaller, so the unidirectional calculation model is not safe.

The Study on Weibull Failure Models for Oil Gap–Paper Insulation Under Pulsating DC Voltage with Temperature

Jiang Tianyan,Deng Biao,He Qiaoqing,Bi Maoqiang,Chen Xi,Bao Lianwei,Zhou Xin 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.2

This paper presents Weibull failure models by experimental work and the step-up accelerated electrical–thermal test of oil-impregnated paper with 0.2 mm thickness is carried out under pulsating DC voltage at different temperatures. The breakdown voltage and failure time of the oil gap–paper insulation specimens at the same voltage duration is obtained by accelerated electrical–thermal aging test. The Weibull failure models of three-variable oil gap–paper insulation modified by Fallou and Ramu are established to analyze the failure data of oil gap–paper under different electric field intensities and temperatures. The statistical test method was used to evaluate the applicability and accuracy of two modified triple-variables Weibull failure models. The comprehensive test index of the Fallou-modified WFD is 1.6851, and the comprehensive test index of the Ramu-modified WFD is 1.8124. The Fallou-modified results were more accurate than Ramu-modified results in estimating the statistical distribution of failure data. Results show that the proposed triple-variable Weibull failure model could fully reflect the insulation state of oil gap–paper under the action of electric and thermal fields.

Two new species of Pustula (Albuginales, Oomycota) from Junggar Basin in China based on morphology and molecular data

Xu, Biao,Choi, Young Joon,Song, Jia Ge,Zhang, Shan He,Xi, Ping Gen,Shin, Hyeon Dong,De Jiang, Zi Springer-Verlag 2018 MYCOLOGICAL PROGRESS Vol.17 No.4

Flavonoid Production Is Effectively Regulated by RNAi Interference of Two Flavone Synthase Genes from Glycine max

Yi Na Jiang,Biao Wang,Hui Li,Lu Ming Yao,Tian Long Wu 한국식물학회 2010 Journal of Plant Biology Vol.53 No.6

Flavonoids are a group of secondary metabolites found in many higher plants. The multiple roles of their flavone subclass include protection against UV damage,regulation of auxin transport, and modulation of flower color. In soybean (Glycine max), flavone synthase II (FNS II) is the key enzyme responsible for flavone biosynthesis. Two FNS II genes from soybean cultivar Hefeng 47 were cloned according to basic local alignment search tool (BLAST) contexts using flavone synthase sequences reported in other species. These were named GmFNSII-1and GmFNSII-2. Sequence alignments showed that the cDNA of GmFNSII-1 was identical to that of CYP93B16,whereas GmFNSII-2 was clearly distinct. Functional assays in yeast (Schizosaccharomyces pombe) suggested that these two enzymes could convert (2S)-naringenin into apigenin. The two GmFNSII genes had similar tissue-specific expression patterns, but GmFNSII-2 was significantly expressed in the roots after treatment with 0.4 M glucose. This demonstrates that the gene plays an important role in the response to defense signals in soybean. RNA interference-mediated suppression of those GmFNSII genes effectively regulated flavone and isoflavone production in hairy roots that arose from soybean cotyledons transformed with Agrobacterium rhizogenes (ATCC15834). Our study also highlights some of the challenges associated with metabolic engineering of plant natural products.

Expression of HMGB1 and its Clinical Significance in T-cell Lymphoma

Mao, Xing-Jiang,Wang, Geng-Fu,Chen, Zhi-Jun,Wang, Li-Na,Zhang, Jun-Biao,Wang, Hui-Ling Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.11

Objectives: To evaluate the clinical significance of HMGB1 expression in T-cell lymphoma. Methods: Immunohistochemical staining for HMGB1 and survivin was performed with specimens from 120 cases of T-cell lymphoma and 40 cases of reactive lymphoid hyperplasia with antibodies against human HMGB1 and survivin. Results: The expression of HMGB1 and survivin was significantly higher in tissues of T-cell lymphoma than in reactive lymphoid hyperplasia. Positive expression of HMGB1 and survivin was observed in 63.7% (65/102) and 61.8% (63/102) of T-cell lymphoma cases, respectively. While was associated with gender, age, and tumor location, significant correlations with malignancy and clinical stage were observed. Spearman rank correlation analysis revealed that the expression of HMGB1 and survivin was positively correlated in T-cell lymphomas (P<0.01). Conclusions: Expression of HMGB1 and survivin in T-cell lymphomas is significantly associated with malignancy and clinical stage, but not with gender, age and tumor location. Elevated expression of HMGB1 may be an important biomarker for the development and progression of T-cell lymphoma.