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An Adaptive Replica Selection Algorithm for Quorum based Distributed Storage System
Zhen Ye,Weijian Hu 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.5
In Quorum based cross datacenter distributed storage systems, data replication is a widely used technology. Such systems usually choose weak consistency, means they prone to select less number of replicas in read request in order to improve the performance, which lead to the possibility of getting stale data. In this paper, we propose an adaptive replica selection algorithm to make sure the system does not exceed specific stale read ratio while achieving good performance. Firstly, we choose a suitable distribution model from many candidates to estimate the time interval between current read request and nearest write request before it. Then we use Monte-Carlo method to simulate the processing order of read request and write request in different replicas. At last we use those estimated values to determine minimal number of replicas each read request needs to select in order to achieve a specific consistency level. We conduct a comprehensive experiments and the result shows our algorithm is effective.
Fusion of Hierarchical Behavior-based Actions in Mobile Robot Using Fuzzy Logic
Ye, Gan Zhen,Kang, Dae-Ki The Korea Institute of Information and Commucation 2012 Journal of information and communication convergen Vol.10 No.2
This paper presents mobile robot control architecture of hierarchical behaviors, inspired by biological life. The system is reactive, highly parallel, and does not rely on representation of the environment. The behaviors of the system are designed hierarchically from the bottom-up with priority given to primitive behaviors to ensure the survivability of the robot and provide robustness to failures in higher-level behaviors. Fuzzy logic is used to perform command fusion on each behavior's output. Simulations of the proposed methodology are shown and discussed. The simulation results indicate that complex tasks can be performed by a combination of a few simple behaviors and a set of fuzzy inference rules.
OTRCaptcha : A Novel Object and Text Recognition Based Image CAPTCHA
Zhen Ye,Yufeng Wu,Wenyao Zhu,Mingjun Wang 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.12
CAPTCHA is an important technology to prevent auto-script attack. Currently most of the CAPTCHA systems are text based, which firstly distort, rotate different characters and then use some obfuscation, aiming to make the text difficult to be recognized by auto-script while still can be learnt easily by real users. However, such kind of CAPTCHA schema either too simple, which can be attacked easily by using optimal character recognition (OCR) or machine learning based technology, or it is too complex that even real users cannot tell it. By observing such contradiction between security and usability, we propose a novel object and text recognition based image CAPTCHA system called OTRCaptcha. In OTRCaptcha, some object images (each has a label) and their names are attached into a background image respectively. In order to pass this CAPTCHA, users have to identify all the object images, labels within those objects and their names. Besides, users also need to identify the semantic relationship between object and its name. Both the theoretical analysis and experiment result show that OTRCapthcha can provide both high security and strong usability.
Ginsenoside Rg1 promotes neurite growth of retinal ganglion cells through cAMP/PKA/CREB pathways
Ye-ying Jiang,Rong-yun Wei,Kai Tang,Zhen Wang,Ning-hua Tan The Korean Society of Ginseng 2024 Journal of Ginseng Research Vol.48 No.2
Background: Mechanisms of synaptic plasticity in retinal ganglion cells (RGCs) are complex and the current knowledge cannot explain. Growth and regeneration of dendrites together with synaptic formation are the most important parameters for evaluating the cellular protective effects of various molecules. The effect of ginsenoside Rg1 (Rg1) on the growth of retinal ganglion cell processes has been poorly understood. Therefore, we investigated the effect of ginsenoside Rg1 on the neurite growth of RGCs. Methods: Expression of proteins and mRNA were detected by Western blot and qPCR. cAMP levels were determined by ELISA. In vivo effects of Rg1 on RGCs were evaluated by hematoxylin and eosin, and immunohistochemistry staining. Results: This study found that Rg1 promoted the growth and synaptic plasticity of RGCs neurite by activating the cAMP/PKA/CREB pathways. Meanwhile, Rg1 upregulated the expression of GAP43, Rac1 and PAX6, which are closely related to the growth of neurons. Meantime, H89, an antagonist of PKA, could block this effect of Rg1. In addition, we preliminarily explored the effect of Rg1 on enhancing the glycolysis of RGCs, which could be one of the mechanisms for its neuroprotective effects. Conclusion: Rg1 promoted neurite growth of RGCs through cAMP/PKA/CREB pathways. This study may lay a foundation for its clinical use of optic nerve diseases in the future.
Zhen Wu,Xinxue Chai,Wei Ye 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.10
This paper proposes a new 2R1T PRS-PRU-PUR overconstrained parallel mechanism (PM). Firstly, the kinematics and stiffness are studied based on screw theory and strain energy. Compared with a typical 3-PRS PM, the main advantage of the proposed PRSPRU-PUR PM is that the orientational range β is improved by 50 %. Secondly, the original PM’s kinematic and stiffness performance are evaluated by using the global transmission index and stiffness index, which are 0.675 and 594 respectively, which causes the decrease of the efficiency of some configurations. Finally, the design parameters are optimized to enhance the PM’s kinematic and stiffness performance. The corresponding optimized indices were increased to 0.915 and 2171, respectively, confirming the validity of the optimal design method.
The deficit at ruin in the Sparre Andersen model with interest
ZHEN-HUA BAO,ZHONG-XING YE 한국전산응용수학회 2007 Journal of applied mathematics & informatics Vol.23 No.1
In this paper, we consider the Sparre Andersen risk model modified by the inclusion of interest on the surplus. By using the techniques of Cai and Dickson [Ins.: Math. Econ. 32(2003)], we give the functional and also the exponential type upper bounds for the tail probability of the deficit at ruin. Some special cases are also discussed.
2-ORDER TURBULENCE CLOSURE PLANKTON ECOSYSTEM DYNAMICS MODEL AND ITS APPLICATION
Zhen Wen Wan,Ye Li Yuan,Fang Li Qiao 한국해안해양공학회 1999 학술강연회 발표논문초록집 Vol.1 No.1
The basic concepts of continuous neurogen dynamics, particle and continuous mass, were cited to describe plankton ecosystems, so a continuous neurogen dynamics model of plankton ecosystem was developed by logically reasoning with less ecological experiential relation. For precise parameterization of diffusion acted on plankton by hydrodynamics, the scheme of 2-order turbulence closure of geophysical fluid dynamics was generalized to enclose the equations of plankton ecosystem dynamics model. This model was applied to simulate a natural ecological process in Jiaozhou Bay. Comparison between simulation and data showed the exciting prognosis ability of this model.
Zhen Wang,,Feng Ye 경남대학교 극동문제연구소 2019 ASIAN PERSPECTIVE Vol.43 No.3
Since Sri Lanka and the People’s Republic of China established diplomatic relations in the 1950s, China has become an important partner of Sri Lanka in the latter’s cause of maintaining national independence and development. Meanwhile, Sri Lanka has been an important political and diplomatic partner for China in the Third World. Since Chinese president Xi Jinping proposed the Belt and Road Initiative (BRI) in 2013, Sri Lanka has become a new investment hot spot due to its location as a hub of the proposed 21st-Centrury Maritime Silk Road. This article provides views identifying the opportunities and potential challenges for Sino–Sri Lankan relations under the framework of China’s 21st-Century Maritime Silk Road initiative.
THE DEFICIT AT RUIN IN THE SPARRE ANDERSEN MODEL WITH INTEREST
Bao, Zhen-Hua,Ye, Zhong-Xing 한국전산응용수학회 2007 Journal of applied mathematics & informatics Vol.23 No.1
In this paper, we consider the Sparre Andersen risk model modified by the inclusion of interest on the surplus. By using the techniques of Cai and Dickson [Ins.: Math. Econ. 32(2003)], we give the functional and also the exponential type upper bounds for the tail probability of the deficit at ruin. Some special cases are also discussed.