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RISS 인기검색어
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- 저자 : ( Guangjun Liang ) (검색결과 4 건)
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Joint Resource Allocation Scheme for OFDM Wireless-Powered Cooperative Communication Networks
( Guangjun Liang ),( Qi Zhu ),( Jianfang Xin ),( Ziyu Pan ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.3
Energy harvesting techniques, particularly radio frequency energy harvesting (RF-EH) techniques, which are known to provide feasible solutions to enhance the performance of energy constrained wireless communication systems, have gained increasing attention. In this paper, we consider a wireless-powered cooperative communication network (WPCCN) for transferring energy in the downlink and forwarding signals in the uplink. The objective is to maximize the average transmission rate of the system, subject to the total network power constraint. We formulate such a problem as a form of wireless energy transmission based on resource allocation that searches for the joint subcarrier pairing and the time and power allocation, and this can be solved by using a dual approach. Simulation results show that the proposed joint optimal scheme can efficiently improve system performance with an increase in the number of subcarriers and relays.
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Siyu Liang,Guangjun Liu,Gaoyang Wu,Tao Chen 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.2
In the process of Al-added pearlitic gray cast iron material cutting, the tool surface will form an adhesive layer due to extrusion and friction, which will have a complex impact on the machining quality and tool life. Therefore, it is necessary to study its formation process and tool wear mechanism in detail. This paper investigates the evolution laws of tool wear and workpiece surface roughness in different cutting parameters, which is based on orthogonal tests. Using the data of the orthogonal tests, an optimization model is carried out to find optimum cutting parameters which can keep a good balance among cutting efficiency, machined surface roughness and tool life. Then, the SEM and energy spectrometer are used to analyze the formation of adhesive layers and the distribution of elements. Compared with the comprehensive test, the orthogonal test can reduce the number of experiments and improve the efficiency on the premise of ensuring accuracy and can be easily applied to practical production. And the results of SEM micrograph and elements distribution map show that the stability of the mass ratio of aluminium to titanium on the tool surface can directly reflect the stability of the adhesive layer, thus affecting the tool life and the machined surface quality.
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Performance Analysis of Cellular Networks with D2D communication Based on Queuing Theory Model
( Jianfang Xin ),( Qi Zhu ),( Guangjun Liang ),( Tiaojiao Zhang ),( Su Zhao ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.6
In this paper, we develop a spatiotemporal model to analysis of cellular user in underlay D2D communication by using stochastic geometry and queuing theory. Firstly, by exploring stochastic geometry to model the user locations, we derive the probability that the SINR of cellular user in a predefined interval, which constrains the corresponding transmission rate of cellular user. Secondly, in contrast to the previous studies with full traffic models, we employ queueing theory to evaluate the performance parameters of dynamic traffic model and formulate the cellular user transmission mechanism as a M/G/1 queuing model. In the derivation, Embedded Markov chain is introduced to depict the stationary distribution of cellular user queue status. Thirdly, the expressions of performance metrics in terms of mean queue length, mean throughput, mean delay and mean dropping probability are obtained, respectively. Simulation results show the validity and rationality of the theoretical analysis under different channel conditions.
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Yufei Liu,Haibo Gao,Liang Ding,Guangjun Liu,Zongquan Deng,Nan Li 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.8
To control autonomous walking of a legged robot, it is essential to obtain the instantaneous velocity and posture of the robot. This paper presents a full body state estimation algorithm for a hexapod robot to estimate the velocity and posture of the trunk body without geometric knowledge of the environment. The velocity and posture estimates of the hexapod robot with passive compliant ankles are further processed by a data fusion method that is proposed based on the extended Kalman filter (EKF) technique, utilizing the leg kinematics model of the robot and the readouts from an on–board inertial measurement unit (IMU). The absolute footholds of the hexapod robot are estimated together with the velocity and posture of the trunk body, with consideration of intermittent ground contacts. Experiments have been conducted on both flat and uneven terrains, and the results have confirmed the effectiveness of the proposed approach.
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