FEEDBACK CONTROL FOR A TURBIDOSTAT MODEL WITH RATIO-DEPENDENT GROWTH RATE

Hu, Xiaoyu,Li, Zuxiong,Xiang, Xingguo The Korean Society for Computational and Applied M 2013 Journal of applied mathematics & informatics Vol.31 No.3

In this paper, a turbidostat model with ratio-dependent growth rate and impulsive state feedback control is considered. We obtain sufficient conditions of the globally asymptotically stable of the system without impulsive state feedback control. We also obtain that the system with impulsive state feedback control has periodic solution of order one. Sufficient conditions for existence and stability of periodic solution of order one are given. In some cases, it is possible that the system exists periodic solution of order two. Our results show that the control measure is effective and reliable.

A real-time multiple vehicle tracking method for traffic congestion identification

( Xiaoyu Zhang ),( Shiqiang Hu ),( Huanlong Zhang ),( Xing Hu ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.6

Traffic congestion is a severe problem in many modern cities around the world. Real-time and accurate traffic congestion identification can provide the advanced traffic management systems with a reliable basis to take measurements. The most used data sources for traffic congestion are loop detector, GPS data, and video surveillance. Video based traffic monitoring systems have gained much attention due to their enormous advantages, such as low cost, flexibility to redesign the system and providing a rich information source for human understanding. In general, most existing video based systems for monitoring road traffic rely on stationary cameras and multiple vehicle tracking method. However, most commonly used multiple vehicle tracking methods are lack of effective track initiation schemes. Based on the motion of the vehicle usually obeys constant velocity model, a novel vehicle recognition method is proposed. The state of recognized vehicle is sent to the GM-PHD filter as birth target. In this way, we relieve the insensitive of GM-PHD filter for new entering vehicle. Combining with the advanced vehicle detection and data association techniques, this multiple vehicle tracking method is used to identify traffic congestion. It can be implemented in real-time with high accuracy and robustness. The advantages of our proposed method are validated on four real traffic data.

Feedback control for a turbidostat model with ratio-dependent growth rate

Xiaoyu Hu,Zuxiong Li,Xingguo Xiang 한국전산응용수학회 2013 Journal of applied mathematics & informatics Vol.31 No.3

In this paper, a turbidostat model with ratio-dependent growth rate and impulsive state feedback control is considered. We obtain sufficient conditions of the globally asymptotically stable of the system without impulsive state feedback control. We also obtain that the system with impulsive state feedback control has periodic solution of order one. Sufficient conditions for existence and stability of periodic solution of order one are given. In some cases, it is possible that the system exists periodic solution of order two. Our results show that the control measure is effective and reliable.

Innovative simulation method of the spherical steel bearing applied to high-speed railway bridges

Renkang Hu,Shangtao Hu,Xiaoyu Zhang,Menggang Yang,Na Zheng 국제구조공학회 2023 Structural Engineering and Mechanics, An Int'l Jou Vol.85 No.2

The spherical steel bearings (SSBs) has been gradually replaced traditional rubber bearings and extensively applied to high-speed railway (HSR) bridges in China, due to their durability and serviceability. Nevertheless, SSB is generally simplified to the ordinary constraints in the finite element model, which cannot reflect its detailed mechanical characteristics, especially its seismic performance. To provide a more precisely simulation, an innovative and simplified finite element simulation method is proposed and the combined element group is developed in ANSYS. The primary parameters were determined by means of the performance test of SSB. The finite element model of SSB applied to a single-span HSR simply supported girder bridge was established through the proposed method. The seismic performance of the SSB was further investigated. A shake table test was conducted to evaluate the accuracy of the proposed simulation method. It is found that the numerical results could have a good agreement with the experiment, namely, the proposed method is feasible and efficient.

Frequency-Domain Transformation Approaches to Develop the d-q Synchronous-Frame Models of Three-Phase Symmetrical Networks and Applications in Modeling of PWM Power Converters

Xiaoyu Wang,Jinjun Liu,Yuji Meng,Jinku Hu,Chang Yuan 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-

Although state-space averaging small-signal modeling techniques are successfully established in DC-DC converters and three-phase sinusoidal PWM converters, these approaches are limited only to low-order systems, and the modeling process is very complex. This paper proposes two equivalent approaches in frequency domain to develop the d-q synchronous-frame models from stationary-frame models for arbitrary three-phase symmetrical circuits. The first modeling approach is illustrated with frequency transformation, by which the target synchronous-frame models could be easily obtained by frequency transformation of the prototype stationary-frame models. The second modeling approach is based on the reactive elements substitutions. These two approaches can be proven to be equivalent, and the first approach is suitable for input-output models, while the second approach is preferable for state-space models. As illustrative examples, these approaches are applied to develop the synchronous-frame models of large three-phase systems with PWM converters. They are proven valid with the comparison with current published models.

Uncertainty quantifi cation of the power control system of a small PWR with coolant temperature perturbation

Xiaoyu Li,Chuhao Li,Yang Hu,Yongqi Yu,Wenjie Zeng,Haibiao Wu 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.6

The coolant temperature feedback coefficient is an important parameter of reactor core power controlsystem. To study the coolant temperature feedback coefficient influence on the core power controlsystem of small PWR, the core power control system is built with the nonlinear model and fuzzy controltheory. Then, the uncertainty quantification method of reactor core parameters is established based onthe Latin hypercube sampling method and the Bootstrap method. Finally, under the conditions ofreactivity step perturbation and coolant inlet temperature step perturbation, uncertainty analysis for twocases is carried out. The result shows that with fuzzy controller and fuzzy PID controller, the uncertaintyof the coolant temperature feedback coefficient affects the core power control system, and the maximumuncertainties of core relative power, coolant temperature deviation, fuel temperature deviation and totalreactivity are acceptable

Development of Golf Industry in China and Evolution of Policies and Regulations

Xiaoyu Zhang,Shuo Li,Qingtao Hu 동북아경상학회 2021 동북아경상연구 Vol.2 No.2

Purpose – Golf industry, as a high-tax industry, has gradually become an important economic source for local governments, and at the same time, it can promote the development of surrounding industries and the appreciation of real estate. Form a variety of golf club-centered resorts and make outstanding contributions to local tourism. Driven by high profits, China’s modern golf started late, but it developed rapidly. Although the rapidly developing golf industry brought a lot of tax revenue and promoted the surrounding industries, in the process of rapid development, it was inevitable that there were problems such as fighting for farmland and destroying the environment, which not only hindered the development of golf, but also caused people’s dissatisfaction due to illegal land occupation. Establish the future development direction through the research of existing problems. Design/Methodology/Approach – By combing China’s policies and regulations, this paper can intuitively show the Chinese government’s most direct attitude towards the golf industry in various periods, and can also reflect the development situation of golf in China from the side. Compared with the western countries, Japan and South Korea, the development of China’s golf industry is still relatively backward. By comparing the literature of the golf industry in Korea and China, this paper also draws on the problems in the development process of the golf industry in South Korea, draws lessons from it, sums up the problems existing in China’s golf industry at present, and thus better establishes the future development direction. Make China’s golf industry develop in the right direction. Findings – As long as China reasonably controls the development of the golf industry and adopts the policy of parallel dredging and blocking, golf will develop healthily in China and bring a lot of benefits to China to achieve a win-win situation. Research Implications – Golf industry can not only bring revenue to China, but also reduce environmental damage and find a reasonable development direction.

On the Development of Golf Industry in Shandong Province

Xiaoyu Zhang,Haoyu Tan,Qingtao Hu 동아시아무역학회 2021 Journal of East Asian Trade(JEAT) Vol.3 No.2

Purpose – Golf, as an elegant, leisure and social sport, also plays an irreplaceable role in sports. Golf originated in Scotland in the 15th century, with a history of more than 500 years ago. Early golf was mostly played by nobles and nobles. Golf was introduced into Asia in the 1820s. The establishment of Shanghai Golf Club in China in 1896 also marked the formal introduction of golf into China. With the continuous improvement of China’s national economy, people have more time, energy, and money to participate in golf. At the same time, with the development of China’s golf peripheral industries, the participation cost of golf has been greatly reduced. The number of people participating in golf in China has steadily increased. With the return of golf to the Olympic Games in 2016, golf has once again entered the public’s field of vision. At the same time, as an item of the National Games, golf is bound to have a broader future. Design/Methodology/Approach – Under the wave of national fitness, golf has also developed well in Shandong Province. Golf can not only strengthen the body, but also promote the appreciation of real estate around the golf course with the development of golf clubs, and form golf resorts and other sports tourism and holiday industries with golf courses as the core. Brought a lot of tax revenue to the local area. In this paper, the golf industry in Shandong Province is taken as the research object, through SWOT analysis, literature review, data analysis and so on. This paper analyzes the conditions for the development of golf industry in Shandong Province, to clarify the advantages and disadvantages of developing golf industry, and then improve it. Findings – Golf and golf industry can bring a lot of tax revenue to Shandong Province, attract other provinces to travel, increase the local economic level, and promote the common development of surrounding industries. Shandong Province has a good geographical environment, geomorphological features, suitable climate and policy support for the development of golf industry. At the same time, indoor golf in Shandong Province can also reduce the cost of people’s participation in golf, and let people know more about golf. Research Implications – Although the golf course in Shandong Province is limited by the resort attribute, which leads to the high price, indoor golf is a supplement, which makes the golf industry and golf culture in Shandong Province develop healthily together.

Frequency Characteristics of the d-q Synchronous-Frame Current Reference Generation Methods for Active Power Filter

Xiaoyu Wang,Jinjun Liu,Jinku Hu,Yuji Meng,Chang Yuan 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-

The d-q harmonics detection algorithms are dominant methods to generate current reference for active power filter (APF). They are often processed in synchronous frame and time domain. This paper researches the frequency characteristics of d-q synchronous transformation which are quite related to the design of close loop regulator and analysis of the performance. Intuitively, the synchronous transformation is explained with amplitude modulation (AM) in this paper. Then the synchronous filter is proven as time-invariant linear transformation and modeled with transfer functions in stationary frame and frequency domain. The frequency-domain analytical models imply that the synchronous transformation has an equivalent effect of frequency transformation, with which the synchronous filter achieves a band pass filter from the low pass filter in synchronous frame. To simplify the analytical model, an instantaneous positive/negative sequence frame is proposed as an expansion of symmetrical components theory. Based on these frequency analytical models, the synchronous filter is compared with the traditional filters in stationary frame. Further more, the d-q harmonics detection methods are improved to get rid of the inherent coupling of synchronous transformation. Typical examples are given to verify previous analysis and comparison. Simulation and experimental results are also given.

Acute Effects of Transforming Growth Factor-β1 on Neuronal Excitability and Involvement in the Pain of Rats with Chronic Pancreatitis

( Xiaoyu Zhang ),( Hang Zheng ),( Hong-yan Zhu ),( Shufen Hu ),( Shusheng Wang ),( Xinghong Jiang ),( Guang-yin Xu ) 대한소화기기능성질환·운동학회 2016 Journal of Neurogastroenterology and Motility (JNM Vol.22 No.2

Background/Aims This study was to investigate whether transforming growth factor-β1 (TGF-β1) plays a role in hyperalgesia in chronic pancreatitis (CP) and the underlying mechanisms. Methods CP was induced in male adult rats by intraductal injection of trinitrobenzene sulfonic acid (TNBS). Abdominal hyperalgesia was assessed by referred somatic behaviors to mechanical stimulation of rat abdomen. Dil dye injected into the pancreas was used to label pancreas-specific dorsal root ganglion (DRG) neurons. Whole cell patch clamp recordings and calcium imaging were performed to examine the effect of TGF-β1 on acutely isolated pancreas-specific DRG neurons. Western blot analysis was carried out to measure the expression of TGF-β1 and its receptors. Results TNBS injection significantly upregulated expression of TGF-β1 in the pancreas and DRGs, and TGF-β1 receptors in DRGs (T9-T13) in CP rats. Intrathecal injection of TGF-β receptor I antagonist SB431542 attenuated abdominal hyperalgesia in CP rats. TGF-β1 application depolarized the membrane potential and caused firing activity of DRG neurons. TGF-β1 application also reduced rheobase, hyperpolarized action potential threshold, and increased numbers of action potentials evoked by current injection of pancreas-specific DRG neurons. TGF-β1 application also increased the concentration of intracellular calcium of DRG neurons, which was inhibited by SB431542. Furthermore, intrathecal injection of TGF-β1 produced abdominal hyperalgesia in healthy rats. Conclusions These results suggest that TGF-β1 enhances neuronal excitability and increases the concentration of intracellular calcium. TGF-β1 and its receptors are involved in abdominal hyperalgesia in CP. This and future study might identify a potentially novel target for the treatment of abdominal pain in CP. (J Neurogastroenterol Motil 2016;22:333-343)