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- 저자 : Zhenguo Gao (검색결과 6 건)
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Power Closed-loop Control of Switched Reluctance Generator for High Efficiency Operation
Li, Zhenguo,Gao, Dongdong,Ahn, Jin-Woo Journal of International Conference on Electrical 2012 Journal of international Conference on Electrical Vol.1 No.3
This paper describes a control method of turn-on/off angles to improve the efficiency of the switched reluctance generator(SRG) with a power closed-loop control system, and the inner-loop of the system is current hysteresis control. The SRG control system is constituted by the PI power controller and the two-level current hysteresis controller. By measuring and analyzing the system losses of different reference powers, speeds and turn-on/off angles, selection strategy of optimal turn-on/off angles is discussed. The proposed method is simple, reliable, and easy to achieve.
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Visual Saliency Detection Based on color Frequency Features under Bayesian framework
( Naeem Ayoub ),( Zhenguo Gao ),( Danjie Chen ),( Rachida Tobji ),( Nianmin Yao ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.2
Saliency detection in neurobiology is a vehement research during the last few years, several cognitive and interactive systems are designed to simulate saliency model (an attentional mechanism, which focuses on the worthiest part in the image). In this paper, a bottom up saliency detection model is proposed by taking into account the color and luminance frequency features of RGB, CIE L*a*b* color space of the image. We employ low-level features of image and apply band pass filter to estimate and highlight salient region. We compute the likelihood probability by applying Bayesian framework at pixels. Experiments on two publically available datasets (MSRA and SED2) show that our saliency model performs better as compared to the ten state of the art algorithms by achieving higher precision, better recall and F-Measure.
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Additive-assisted preferential crystallization of racemic component: A case of norvaline
Jie Sun,Yaping Wang,Zhenguo Gao,Junbo Gong,Weiwei Tang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.110 No.-
Herein, we report a successful resolution of L-norvaline, a racemic compound system, performed near theeutectic composition by coupling preferential crystallization with tailor-made additives. The structures ofenantiomer and racemate were characterized by PXRD, DSC, and the enantiomeric purity were measuredby Chiral HPLC. The preferential crystallization process was designed and established from binary meltingphase diagram and ternary solution phase diagram. The effects of supersaturation, solution enantiomercomposition, and seed quantity on the preferential crystallization process were investigated. However, the significant improvements of enantiomeric purity and product yield were demonstratedby additive-assisted preferential crystallization approach using tailor-made additives. These additivesbearing similar structure motifs to norvaline a highly selective binding to the racemate rather than enantiomerand remarkably suppress nucleation of DL-norvaline, the key factor determining the resultantenantiomer purity and separation efficiency. The underly inhibition principle was revealed due to thecentrosymmetric packing of the racemate while the polarity of enantiomer leads to only partial or slightcrystallization suppression. The interesting inhibition mode by tailor-made additives is also believed tobe applicable for other racemic crystallization systems. Our established additive-assisted preferentialcrystallization has showed great potential in the development of separation technology and resolutionof enantiomer from racemic compounds.
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Cheng, Peng,Cheng, You,Li, Yan,Zhao, Zhenguo,Gao, Hui,Li, Dong,Li, Hua,Zhang, Tao Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.8
Lung cancer seriously threatens human health, so it is important to investigate gene expression changes in affected individuals in comparison with healthy people. Here we compared the gene expression profiles between smokers with and without lung cancer. We found that the majority of the expressed genes (threshold was set as 0.1 RPKM) were the same in the two samples, with a small portion of the remainder being unique to smokers with and without lung cancer. Expression distribution patterns showed that most of the genes in smokers with and without lung cancer are expressed at low or moderate levels. We also found that the expression levels of the genes in smokers with lung cancer were lower than in smokers without lung cancer in general. Then we detected 27 differentially expressed genes in smokers with versus without lung cancer, and these differentially expressed genes were foudn to be involved in diverse processes. Our study provided detail expression profiles and expression changes between smokers with and without lung cancer.
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ASESDP : An Efficient Service Discovery Protocol in Pervasive Computing Environments
Ma, Qianli,Liao, Minghong,Jiang, Shouxu,Hong, Wan-Pyo,Gao, Zhenguo The Korea Institute of Information and Commucation 2008 Journal of information and communication convergen Vol.6 No.4
Service discovery is the technology of finding needed services in networks, and a key point in pervasive computing environments. This paper presents a novel service discovery protocol: ASESDP(AIP and SRR Enhanced Service Discovery Protocol). In ASESDP, tow schemes are proposed to enhance its performance: AIP(Advertisement Information Piggybacked) and SRR(Shortest Reply Route). In AIP, parts of advertisement information are piggybacked in the service reply packet, which makes the advertisement information propagating along the reply path, and spreads its transmission area. In SRR, in order to reduce the service response time, the shortest reply route is chosen to forward the service reply packet to the source node sending the service request. With the theoretical analysis and Glomosim simulation results, it is verified that ASESDP can reduce the number of service request packets, save the response time, and improve the efficiency of service discovery.
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Fire Resistances of Restrained Steel Beams Subjected to Fire Loads
Zhen Guo,Rui Gao,Xuecheng Zhang,Xingzhi Jia 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.8
Conventional fire loads and fire resistances of a steel beam still lack an adequate correlation. This paper has established therelationship between the responses of restrained steel beams and fire actions by using a new definition of fire resistances and a newexpression of fire loads. By using reduction factors of elastic modulus and yield strengths, has presented three critical equations topredict the limit state of a restrained steel beam in a fire. Based on these equations and the heat transfer formula, the paper provided anew definition of fire resistances. By using the heat release rate and effective rate coefficient of thermal absorption, a new expressionof fire loads has been argued. Compared with tests, the proposed approach in this paper is in good agreement with the measuredvalues in tests. The results show that the new fire resistances could be able to reflect the facts of heat transfers and duration time. Incontrast to conventional fire loads, the new fire loads are more efficient to indicate a fire load.
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