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      • Tag-Based Interest-Matching Users Discovery Approach in Online Social Network

        Sheng Bin,Gengxin Sun,Peijian Zhang,Yixin Zhou 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.5

        With the popularity of online social networks, such as Facebook, YouTube and Douban, have become a channel for fast information propagation and influence. The problem of discovering common interests shared by groups of users has become one of the central researches because it helps to connect users with common interests and can eventually influence as many users with common interests in the online social network as possible. Unfortunately, most of existing related works have only focused on the network topologies and so unable to identify the common interests of users who have no online connections. In an online social network, users tend to use descriptive tags to annotate the contents that they are interested in. User-generated tags are consistent with the content they are attached to. Thus, patterns of frequent co-occurrences of user tags can be used to characterize and capture topics of user interests. In this paper, we propose a novel common interests discovery approach based on user-generated tags to discover the set of interest-matching users whose interests are similar. The experiment results show that our approach can effectively discover user communities with common interests no matter if they have any online connections.

      • KCI등재

        Probability Evaluation of Hydrodynamic Shear Damage for Fish Passing through Jet Fish Pumps

        Maosen Xu,Jiegang Mou,Denghao Wu,Peijian Zhou,Yunqing Gu,Shuihua Zheng 한국유체기계학회 2020 International journal of fluid machinery and syste Vol.13 No.2

        Jet fish pump is an efficient tool to transport fish. Due to the operation principle, shear flow cannot be avoided in jet fish pumps. Shear flow is a potential risk for fish damage in the fluid machinery. Therefore, it is valuable to evaluate the probability of hydrodynamic shear damage for fish passing through jet fish pumps. In the present study, the numerical investigation was performed on the distribution of dangerous region, where exposure strain rate was above 500 s-1, and probability of hydrodynamic shear damage for fish. Experiments were conducted to check the damage probability calculated by numerical simulation and the injury of fish was analyzed. The results showed that the dangerous region is usually distributed in the near wall region. As the rise of flow ratio, the range of dangerous region gradually became wider and the dangerous region extended into the throat. In the same inlet boundary conditions, the damage probability is lower for a jet fish pump with a bigger area ratio. With the increase of flow ratio, both probability of hydrodynamic shear damage and effect of area ratio grow. Compared with the results of experiments, the probability of hydrodynamic shear damage can be overestimated. The main reasons lie in the extremely short transit time for fish, independent movement of fish and the velocity difference between fish and flow.

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        Shaking Table Test on Composite Isolation System of High-speed Railway Station with Integrated Station-Bridge Structure

        Yingying Zhang,Penghao Yu,Baorui Sun,Yi Zhou,Peijian Chen,Junhao Xu,Yushuai Zhao 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.2

        This paper investigated the seismic performance of a typical “Integrated Station-Bridge high-speed railway station structure with a composite isolation system. The influential mechanism of the structure with isolation system was analyzed based on shaking table tests, mainly investigating on the failure mode, acceleration response and displacement response. Besides, a parameter optimization method of isolation layer for long-span structures was proposed based on genetic algorithm to better enhance the isolation performance of the large-span structure. The research revealed that there was no obvious damage to the composite isolation system under the PGA = 0.82 g. The nature frequency of the structure with isolation system is only 12.5% of that of non-isolation structure. The first three natural vibration frequency of the structure with isolation system only reduce 3.4%, 3.2%, 6.14% after the PGA = 1.27 g, that of the non-isolation structure reduce by more than 20%. The acceleration amplification factor of each layer of composite isolation system is less than 1, in particular, that of truss is about 0.3. The displacement response and acceleration response of the structure with isolation system have been reduced by about 90%. The proposed optimization method of isolation layer parameters provides an important reference for the isolation design for high-speed railway stations.

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        System Control Methods for Energy Efficiency Improvement of Parallel Pump Systems: A Review

        Chenchen Hua,Maosen Xu,Jiegang Mou,Junlei Wang,Peijian Zhou,Xuelong Yang 한국유체기계학회 2023 International journal of fluid machinery and syste Vol.16 No.4

        With the consistent pursuit of global countries for the goal of carbon neutrality, the urgency of energy saving and emission reduction is self-evident. Considering the critical proportion of pump consumption in the total energy consumption, improving its energy efficiency is significant to energy saving and emission reduction. Recently, many researches have aimed to improve parallel pump systems' energy efficiency. Due to the inflexibility of the existing parallel pump systems structure and the difficulty of equipment modification, the research methods mainly focus on improving the system control methods to enhance the system performance further. This paper introduces the latest research progress in modeling and control methods for parallel pump systems, firstly analyzing the energy consumption of existing parallel pump systems and proposing the possibility of energy saving in parallel pump systems. Then the system modeling and control methods are discussed in detail, comparing the traditional control methods with the emerging control optimization methods and discussing the parallel pump systems structure and monitoring. This review is expected to provide insights for future research on improving the performance of parallel pump systems.

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