Automatic identification and analysis of multi-object cattle rumination based on computer vision

Yueming Wang,Tiantian Chen,Baoshan Li,Qi Li 한국축산학회 2023 한국축산학회지 Vol.65 No.3

Rumination in cattle is closely related to their health, which makes the automatic monitoring of rumination an important part of smart pasture operations. However, manual monitoring of cattle rumination is laborious and wearable sensors are often harmful to animals. Thus, we propose a computer vision-based method to automatically identify multi-object cattle rumination, and to calculate the rumination time and number of chews for each cow. The heads of the cattle in the video were initially tracked with a multi-object tracking algorithm, which combined the You Only Look Once (YOLO) algorithm with the kernelized correlation filter (KCF). Images of the head of each cow were saved at a fixed size, and numbered. Then, a rumination recognition algorithm was constructed with parameters obtained using the frame difference method, and rumination time and number of chews were calculated. The rumination recognition algorithm was used to analyze the head image of each cow to automatically detect multi-object cattle rumination. To verify the feasibility of this method, the algorithm was tested on multi-object cattle rumination videos, and the results were compared with the results produced by human observation. The experimental results showed that the average error in rumination time was 5.902% and the average error in the number of chews was 8.126%. The rumination identification and calculation of rumination information only need to be performed by computers automatically with no manual intervention. It could provide a new contactless rumination identification method for multi-cattle, which provided technical support for smart pasture.

Effect of Outdated Channel Estimates on Multiple Antennas Multiple Relaying Networks

( Lei Wang ),( Yueming Cai ),( Weiwei Yang ),( Wei Yan ),( Jialei Song ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.5

In this paper, we propose an intergraded unified imperfect CSI model and investigate the joined effects of feedback delay and channel estimation errors (CEE) for two-hop relaying systems with transmit beamforming and relay selection. We derived closed-form expressions for important performance measures including the exact analysis and lower bounds of outage probability as well as error performance. The ergodic capacity is also included with closed-form results. Furthermore, diversity and coding gains based on the asymptotic analysis at high SNRs are also presented, which are simple and concise and provide new analytical insights into the corresponding power allocation scheme. The analysis indicates that delay effect results in the coding gain loss and the diversity order loss, while CEE will merely cause the coding gain loss. Numerical results verify the theoretical analysis and illustrate the system is more sensitive to transmit beamforming delay compared with relay selection delay and also verify the superiority of optimum power allocation. We further investigate the outage loss due to the CEE and feedback delays, which indicates that the effect of the CEE is more influential at low-to-medium SNR, and then it will hand over the dominate role to the feedback delay.

Trajectory tracking control of underactuated USV based on modified backstepping approach

Zaopeng Dong,Lei Wang,Yueming Li,Guocheng Zhang 대한조선학회 2015 International Journal of Naval Architecture and Oc Vol.7 No.5

This paper presents a state feedback based backstepping control algorithm to address the trajectory tracking problem of an underactuated Unmanned Surface Vessel (USV) in the horizontal plane. A nonlinear three Degree of Freedom (DOF) underactuated dynamic model for USV is considered, and trajectory tracking controller that can track both curve trajectory and straight line trajectory with high accuracy is designed as the well known Persistent Exciting (PE) conditions of yaw velocity is completely relaxed in our study. The proposed controller has further been enriched by incorporating an integral action additionally for enhancing the steady state performance and control precision of the USV trajectory tracking control system. Global stability of the overall system is proved by Lyapunov theory and Barbalat’s Lemma, and then simulation experiments are carried out to demonstrate the effectiveness of the controller designed.

Modified model for estimation of agglomerate sizes of binary mixed nanoparticles in a vibro-fluidized bed

Xizhen Liang,Jian Wang,Tao Zhou,Hao Duan,Yueming Zhou 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.8

A modified model is established according to the analysis of energy balance acting on an agglomerate of binary mixed nanoparticles in a vibrated fluidized bed (VFB). The sizes of agglomerates of binary mixed nanoparticles are calculated with this model. The average agglomerate size estimated by the model of energy balance decreases with increasing superficial gas velocity. The vibration frequency had a comparatively significant impact on agglomerate sizes that seemed to change regularly and decreased with higher frequency. Both of the experimental and theoretical results showed that vibration led to a smaller agglomerate size, and the average agglomerate sizes calculated by this model provided the closest fit to those determined experimentally.

Energy-Efficient Secure Multiuser Scheduling in Energy Harvesting Untrusted Relay Networks

Dechuan Chen,Yunpeng Cheng,Xiangdong Wang,Weiwei Yang,Jianwei Hu,Yueming Cai 한국통신학회 2019 Journal of communications and networks Vol.21 No.4

In this paper, we investigate opportunistic secure multiuserscheduling in energy harvesting untrusted relay networks,where an energy-constrained amplify-and-forward (AF) relay harvestsenergy from the received radio frequency signal via usingthe power splitting protocol. To exploit the potential advantages(e.g., multiuser diversity and direct links) for secrecy improvement,we examine three opportunistic user scheduling schemes,i.e., optimal scheduling scheme, maximum scheduling scheme, andminimum scheduling scheme. Specifically, the optimal schedulingscheme performs user selection by maximizing the ratio betweenthe signal-to-noise-ratio (SNR) at the destination and the correspondingSNR at the untrusted relay. The maximum schedulingscheme is conventional user selection that maximizes the channelgain of the direct links. For the minimum scheduling scheme, wetry to reduce the overheard information at the untrusted relay byselecting the user with the lowest channel gain of the relay links. For these three schemes, we comprehensively examine the achievablesecrecy performance including probability of positive secrecyrate, secrecy outage probability (SOP), asymptotic SOP, secrecythroughput (ST), as well as secure energy efficiency (SEE) to helpfacilitate an energy-efficient secure transmission design. Simulationresults demonstrate that the maximum scheduling scheme outperformsthe minimum scheduling scheme in terms of SOP at relativelylow SNRs and target secrecy rates.

Recent advances of Na3V2(PO4)3 as cathode for rechargeable zinc-based batteries

Ding Kunpeng,Jiang Tian,Peng Jian,Wang Peng,Gou Wenshan,Xu Qingyu,Fan Qi,Wang Wei,Sun Yueming 한국탄소학회 2023 Carbon Letters Vol.33 No.4

Rechargeable zinc-based batteries (RZBs) with the advantages of high safety, low cost, abundant resources and environmental friendliness, are considered as advanced secondary battery systems that can be applied to large-scale energy storage. As an important cathode material for RZBs, NASICON-type Na3V2(PO4)3 (NVP) possesses three-dimensional and large-scale ion channels that facilitate the rapid diffusion of Zn2+, and has a higher average operating voltage compared with other vanadium-based compounds, thus exhibiting the possibility of realizing RZBs with high energy density. However, NVP still has some problems, such as poor electronic conductivity and spontaneous dissolution in aqueous solution. The sluggish kinetics of Zn2+ (de)intercalation in NVP and dendritic growth on the Zn anode also contribute to the poor rate performance and short cycle life of the batteries. In this review, optimization strategies for the electrochemical performance of RZBs with NVP as cathode are systematically elaborated, including modification of NVP cathode and optimization of electrolyte. Several mainstream energy storage mechanisms and analysis methods in this battery system are sorted out and summarized. On this basis, the development direction of NVP–RZB system is further prospected.

Social-Aware Collaborative Caching Based on User Preferences for D2D Content Sharing

( Can Zhang ),( Dan Wu ),( Liang Ao ),( Meng Wang ),( Yueming Cai ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.3

With rapid growth of content demands, device-to-device (D2D) content sharing is exploited to effectively improve the service quality of users. Considering the limited storage space and various content demands of users, caching schemes are significant. However, most of them ignore the influence of the asynchronous content reuse and the selfishness of users. In this work, the user preferences are defined by exploiting the user-oriented content popularity and the current caching situation, and further, we propose the social-aware rate, which compre-hensively reflects the achievable contents download rate affected by the social ties, the caching indicators, and the user preferences. Guided by this, we model the collaborative caching problem by making a trade-off between the redundancy of caching contents and the cache hit ratio, with the goal of maximizing the sum of social-aware rate over the constraint of limited storage space. Due to its intractability, it is computationally reduced to the maximi-zation of a monotone submodular function, subject to a matroid constraint. Subsequently, two social-aware collaborative caching algorithms are designed by leveraging the standard and continuous greedy algorithms respectively, which are proved to achieve different approxima-tion ratios in unequal polynomial-time. We present the simulation results to illustratethe performance of our schemes.

Statics variation analysis due to spatially moving of a full ocean depth autonomous underwater vehicle

Jiang, Yanqing,Li, Ye,Su, Yumin,Cao, Jian,Li, Yueming,Wang, Youkang,Sun, Yeyi The Society of Naval Architects of Korea 2019 International Journal of Naval Architecture and Oc Vol.11 No.1

Changes in gravity and buoyancy of a Full Ocean Depth Autonomous Underwater Vehicle (FOD-AUV) during its descending and ascending process must be considered very carefully compared with a Human Occupied Vehicle (HOV) or a Remotely Pperated Vehicle (ROV) whose activities rely on human decision. We firstly designed a two-step weight dropping pattern to achieve a high descending and ascending efficiency and a gravity-buoyancy balance at designed depth. The static equations showed that gravity acceleration, seawater density and displacement are three key aspects affecting the balance. Secondly, we try our best to analysis the gravity and buoyancy changing according to the previous known scientific information, such as anomaly of gravity acceleration, changing of seawater states. Finally, we drew conclusion that gravity changes little (no more than 0.1kgf, it is impossible to give a accurate value). A density-depth relationship at the Challenger Deep was acquired and the displacement changing of the FOD-AUV was calculated preciously.

Statics variation analysis due to spatially moving of a full ocean depth autonomous underwater vehicle

Yanqing Jiang,Ye Li,Yumin Su,Jian Cao,Yueming Li,Youkang Wang,Yeyi Sun 대한조선학회 2019 International Journal of Naval Architecture and Oc Vol.11 No.1

Changes in gravity and buoyancy of a Full Ocean Depth Autonomous Underwater Vehicle (FOD-AUV) during its descending and ascending process must be considered very carefully compared with a Human Occupied Vehicle (HOV) or a Remotely Pperated Vehicle (ROV) whose activities rely on human decision. We firstly designed a two-step weight dropping pattern to achieve a high descending and ascending efficiency and a gravity-buoyancy balance at designed depth. The static equations showed that gravity acceleration, seawater density and displacement are three key aspects affecting the balance. Secondly, we try our best to analysis the gravity and buoyancy changing according to the previous known scientific information, such as anomaly of gravity acceleration, changing of seawater states. Finally, we drew conclusion that gravity changes little (no more than 0.1kgf, it is impossible to give a accurate value). A density-depth relationship at the Challenger Deep was acquired and the displacement changing of the FOD-AUV was calculated preciously.