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Shuai-Shuai Lu,Peng Yan 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.6
In the present paper, we take the multi-leaf spring mechanism as a particular element to develop a modeling approach for the stiffness by considering the coupling effects of the cross axis force. With this, a more accurate model of the multi-leaf spring based nano-stage is derived by incorporating the effect of cross axis input force, which can better predict the coupling error. The new analytical model indicates that the total axial stiffness is an inverse-quadratic function of the cross axis input load instead of a constant value, which can be used to analyze the cross axis coupling error of multi-leaf spring based nano-stages. The proposed analysis method is then verified by FEA and experiments, where excellent results are demonstrated in predicting the cross axis coupling effects of nano-stages such as stiffness variation and coupling error. The proposed approach offers a new look into the design and manipulation of multileaf spring based nano-stages.
Friction and Wear of Self-mated SiC and Si3N4 in Green Water-based Lubricant
Shuai Yan,Bin Lin,Feng Liu,Fugang Yan 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
Hydrostatic/hybrid bearings have been used in many engineering applications. In order to address the disadvantages of lubricating oil such as pollution and resource consumption, researchers are trying to use water to replace oil in these bearings. To eliminate the corrosivity of water and increase its viscosity, additives were added in water and this new lubricant is called “green water-based lubricant”. Ceramics are considered to be very suitable tribo-pair materials in water. In order to select the best material in the green water-based lubricant and explore the effect of the additives, this paper carried out friction and wear experiments of self-mated SiC and self-mated Si3N4 in this new lubricant on a ring-toring tribometer. The results show that self-mated SiC possesses better running-in property, higher load-carrying capacity,lower friction coefficient, lower wear rate and smoother surface topography. The results show that the self-mated SiC and green water-based lubricant is a promising combination to replace the metal/oil system in hydrostatic/hybrid bearings.
Node-Level Trust Evaluation Model Based on Blockchain in Ad Hoc Network
Shuai-ling Yan,정영지 한국인터넷방송통신학회 2019 Journal of Advanced Smart Convergence Vol.8 No.4
Due to the characteristics of an ad hoc network without a control center, self-organization, and flexible topology, the trust evaluation of the nodes in the network is extremely difficult. Based on the analysis of ad hoc networks and the blockchain technology, a blockchain-based node-level trust evaluation model is proposed. The concepts of the node trust degree of the HASH list on the blockchain and the perfect reward and punishment mechanism are adopted to construct the node trust evaluation model of the ad hoc network. According to the needs of different applications the network security level can be dynamically adjusted through changes in the trust threshold. The simulation experiments demonstrate that ad-hoc on-demand distance vector(AODV) Routing protocol based on this model of multicast-AODV(MAODV) routing protocol shows a significant improvement in security compared with the traditional AODV and on-demand multipath distance vector(AOMDV) routing protocols.
Node-Level Trust Evaluation Model Based on Blockchain in Ad Hoc Network
Yan, Shuai-ling,Chung, Yeongjee The Institute of Internet 2019 International journal of advanced smart convergenc Vol.8 No.4
Due to the characteristics of an ad hoc network without a control center, self-organization, and flexible topology, the trust evaluation of the nodes in the network is extremely difficult. Based on the analysis of ad hoc networks and the blockchain technology, a blockchain-based node-level trust evaluation model is proposed. The concepts of the node trust degree of the HASH list on the blockchain and the perfect reward and punishment mechanism are adopted to construct the node trust evaluation model of the ad hoc network. According to the needs of different applications the network security level can be dynamically adjusted through changes in the trust threshold. The simulation experiments demonstrate that ad-hoc on-demand distance vector(AODV) Routing protocol based on this model of multicast-AODV(MAODV) routing protocol shows a significant improvement in security compared with the traditional AODV and on-demand multipath distance vector(AOMDV) routing protocols.
중국 대학 조선어(한국어)와 교육과정 개선방안 : 중국 치치하얼대학을 중심으로
YAN SHUAI 한국어교육연구학회 2020 한국어교육연구 Vol.- No.12
중국에서의 한국어교육이 시작된 지 이미 60여 년이 되었다. 그 과정에서 우여곡절도 많았지만 성과도 적지 않다. 특히 한국과 중국은 수교 이후 최근에 들어서는 두 나라의 활발한 교류가 경제, 문화, 정치, 사회, 교육 등으로 빠르게 확대되고 있고, 이에 따라 높은 수준의 한국어를 구사할 수 있는 인력에 대한 필요성이 증가하고 있다. 한국어를 유창하게 사용하는 인재에 대한 수요가 중국 산업계를 중심으로 증가함에 따라 중국 대학에 한국어 전공이 개설되기 시작하였고, 한국어교육의 규모는 기하급 수적으로 확대되었다. 중국 지역의 한국어 수요에 맞는 한국어 교육이 필요한 시점에 이른 것이다. 본 논문은 중국 치치하얼대학의 조선어(한국어)과를 선정하여 현행 한국어 교육과정에 대한 학생들의 인식과 요구조사를 통해 기존의 한국어 교육과정에 문제를 제기하며 이를 효율적으로 개편하고 보완할 수 있는 실질적인 방안을 모색하는데 목적이 있다. It has been more than 60 years since the Korean language education began in China. There were some problems during the time, but there were some successes as well. In these days, Korea and China have actively been expanding each other’s exchanges recently in the economy, culture, politics, society, and education after establishing diplomatic relations. As the demand for people who can speak Korean fluently increases in Chinese industry, Korean language majors have begun to open at Chinese universities, and the number of Korean language institutes exponentially expanded. It is time for Korean language education to meet the needs of Korean language demands in China. This paper is planned from the Korean language department of Qiqihar University in China, and used questions on the existing Korean language curriculum by questionnaire for examining students perceptions and needs of the current Korean language curriculum. The purpose of the paper is to find a proper way to improve the Korean language curriculum at the universities in China.
Applicability Analysis of Microseismic Technology in Tunnel Water Inrush Monitoring
Yan-hao Chen,Shuai Cheng,Li-Ping Li,Jun-yan Yang,Hong-liang Liu,Wen-feng Tu 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.7
Water inrush disaster is one of the most serious geological disasters in tunnel construction. There are still some problems in the existing researches, such as the activity information of surrounding rock is difficult to obtain, the mechanism of water inrush disaster is unclear, the correlation between water inrush disaster and microseismic (MS) information is missing, which have caused the water inrush disaster to be passively controlled. Combining with the practical experience of tunnel engineering, the application problems of MS technology in tunnel engineering is summarized, which provides ideas for monitoring of surrounding rock activity. The formation mechanism of water inrush disaster caused by rock mass fracturing and filling medium instability has been revealed. The MS characteristics of the water inrush channel in different water inrush disasters have also been revealed. The MS response characteristics of water inrush and rockburst disasters are compared, which provides guidance for the improvement of MS monitoring technology and the analysis of effective MS information. The compression failure test of limestone under saturated and natural conditions is carried out. The results show that the presence of water weakens the ability of rock to store energy. The acoustic emission (AE) phenomenon is weaker in the process of saturated limestone failure, which increases the difficulty of AE monitoring. The number of AE events of natural limestone and saturated limestone shows a slow increase to a sudden increase in the process stress loading, which can be regarded as an important precursor of rock failure.
Shuai Yan,Huiju Yang,Lianlin Su,Mingyue Zhou,Xiaopeng Wang 한국탄소학회 2023 Carbon Letters Vol.33 No.6
Aurantii Fructus Immature (AFI) and Aurantii Fructus (AF) are two important traditional Chinese herbs. As the harvesting time varies, the medicinal value of the plants is not uniform. Consequently, it has been difficult to quickly recognize them within the realm of traditional Chinese medicine. Separation and detection technologies are employed in combination to create fingerprints for identification. We proposed the utilization of graphene-assisted electrochemical fingerprint technology to acquire fingerprints of two varieties of medicinal materials. Simultaneously, we also obtained their fingerprints through HPLC. Two fingerprint recognition technologies were compared for their effectiveness. The findings demonstrate that the signals obtained through electrochemical fingerprinting have a higher recognition rate.