Autopilots for Small Unmanned Aerial Vehicles: A Survey

HaiYang Chao,YongCan Cao,YangQuan Chen 제어·로봇·시스템학회 2010 International Journal of Control, Automation, and Vol.8 No.1

UAV users. The UAV flight control basics are introduced first. The radio control system and autopilot control system are then explained from both the hardware and software viewpoints. Several typical off-the-shelf autopilot packages are compared in terms of sensor packages, observation approaches and controller strengths. Afterwards some open source autopilot systems are introduced. Conclusion is made with a summary of the current autopilot market and a remark on the future development.

A Reliable and Configurable E-commerce Mechanism based on Mobile Agents in Mobile Wireless Environments

Haiyang Hu,Hua Hu,Jie Chen 보안공학연구지원센터 2008 International Journal of Hybrid Information Techno Vol.1 No.1

Because of the limited capability of mobile devices and lower bandwidth of wireless network, Web-based e-commerce in mobile wireless environments suffers more challenges and it needs an efficient and reliable mechanism to support the process. This paper presents a flexible and configurable mechanism, which uses mobile agents as brokers of mobile device to communicate with Web server, thus to reduce the unnecessary wireless communication costs of mobile client. It can also facilitate mobile device recovery back when suffering a failure to increase the reliability of the whole application process. Compared with other mechanisms through performance analysis, our mechanism shows its efficiency and reliability.

Online probabilistic forecasting method for trapezoidal photovoltaic stream data

Yu, Haiyang,Chen, Chunyi,Yang, Huamin The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.11

For the probabilistic forecasting of photovoltaic generation, the design of a feasible online predictive framework is a challenging problem. To deal with this issue, an ensemble dynamic OS-ELM based on quantile estimation has been proposed. Considering inherent intermittent and random variations of the photovoltaic sequence, the weights of the forecasting model are updated according to the loss suffered. At the same time, the accommodative feature threshold can be calculated on the basis of increasing characteristics space, which builds the optimal network architecture for point forecast. A two-dimensional kernel density estimation algorithm based on a fuzzy inference method is exploited. This method breaks through the assumptive limit of error distribution. The changeable parameters help the model to be suitable for power fluctuations. Both the arriving data sample and the increasing feature space are tackled. Numerical experiments are conducted on two practical applications for solar power systems. The results show that the proposed algorithm not only has lower generalization error, but also provides higher confidence coefficient.

Co-precipitation synthesis and characterization of Bi3+, Eu3+ co-doped nanocrystal Gd2WO6 phosphors.

Tian, Yue,Chen, Baojiu,Hua, Ruinian,Cheng, Lihong,Zhong, Haiyang,Sun, Jiashi,Wang, Bo,Wan, Jing,Lu, Weili,Jang, Kiwan American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.3

<P>Eu3+ single-doped and Bi3+/Eu3+ co-doped nanocrystal Gd2WO6 phosphors were successfully synthesized via a co-precipitation reaction. The structure and morphology of the phosphors were characterized by using X-ray powder diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The influence of Bi(3+)-doping concentration on the excitation and emission spectra was studied. It was found that the introduction of Bi3+ can greatly affect the charge transfer band and the luminescence intensity of Eu3+ but does not cause a change in the profile of emission spectra of Eu3+.</P>

Effects of hydrothermal parameters on the physicochemical property and photocatalytic degradation of bisphenol A of Ti-based TiO2 nanomaterials

Dong Li,Yunzhou Chen,Jialin Jia,Haiyang He,Wei Shi,Jianghua Yu,Jun Ma 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-

Effects of hydrothermal parameters on morphology, crystal structure, light absorption, separation efficiencyof photo-generated charge carriers, and photocatalytic removal of Bisphenol A (BPA) of Ti-basedTiO2 nanomaterials were systematically investigated. Through changing hydrothermal parameters,TiO2 nanobelts, TiO2 nanosheets and TiO2 nanowires were prepared. With increasing NaOH concentration,hydrothermal temperature, and hydrothermal time, more TiO2 with (101) crystal plane grew onTi substrate, resulting in higher crystallinity. The UV-light absorption enhanced with increasing NaOHconcentration, but decreased with improving hydrothermal temperature, hydrothermal time, and HClconcentration. Variation of UV-light absorption was mainly affected by morphology, and UV-light absorptionof TiO2 nanomaterials with different morphologies was arranged in order ofnanobelts > nanosheets > nanowires. The hydrothermal growth of TiO2 nanomaterials on Ti plate conformedto Ostwald ripening mechanism. Variation trend of photo-generated current was consistent withthat of BPA degradation, they both first increased and then decreased within investigated range. The optimalNaOH concentration, hydrothermal temperature, hydrothermal time, and HCl washing concentrationwere 1 M, 170℃, 28 h, and 0.1 M, respectively. Under this condition, Ti-based TiO2 nanosheets exhibitedthe highest BPA removal efficiency (92.7%), which was due to highly ordered nanosheet structure, goodcrystallinity, appropriate UV-light absorption and high separation efficiency of electron-hole pairs.

A study of deterioration of reinforced concrete beams under various forms of simulated acid rain attack in the laboratory

Yingfang Fan,Zhiqiang Hu,Haiyang Luan,Dawei Wang,An Chen 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.52 No.1

This paper studies the behaviour of deteriorated reinforced concrete (RC) beams attacked by various forms of simulated acid rain. An artificial rainfall simulator was firstly designed and evaluated. Eleven RC beams (120 mm×200 mm×1800 mm) were then constructed in the laboratory. Among them, one was acting as a reference beam and the others were subjected to three accelerated corrosion methods, including immersion, wetting-drying, and artificial rainfall methods, to simulate the attack of real acid rain. Acid solutions with pH levels of 1.5 and 2.5 were considered. Next, ultrasonic, scanning electron microscopy (SEM), dynamic, and three-point bending tests were performed to investigate the mechanical properties of concrete and flexural behaviour of the RC beams. It can be concluded that the designed artificial simulator can be effectively used to simulate the real acid rainfall. Both the immersion and wetting-drying methods magnify the effects of the real acid rainfall on the RC beams.

H∞ Synchronization of Two Different Discrete-Time Chaotic Systems via a Unified Model

Mei-Qin Liu,Haiyang Chen,Senlin Zhang,Weihua Sheng 제어·로봇·시스템학회 2015 International Journal of Control, Automation, and Vol.13 No.1

This paper presents some novel synchronization methods for two discrete-time chaotic systems with different time delays, which are transformed into two unified models. First, the H∞ performance of the synchronization error dynamical system between the drive unified model and the response one is analyzed using the linear matrix inequality (LMI) approach. Second, the novel state feedback controllers are established to guarantee H∞ performance for the overall system. The parameters of these controllers are determined by solving the eigenvalue problem (EVP). Most discrete-time chaotic systems with or without time delays can be converted into this unified model, and H∞ synchronization controllers are designed in a unified way. The effectiveness of the proposed design methods are demonstrated by three numerical examples.

Molecular cloning of the Bombus terrestris bumblebee venom protein phospholipase A2 and its anti-leukemia effects on K562 cells

Yuling Qiu,Yali Chen,Haiyang Yu,Qianxiang Zhou,Ran Wang,Meihua Jin,Dexin Kong 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.2

Bee venom has been used for treating various diseases for a long time. However, the bioactive constituents of bee venom and its mechanisms remain poorly understood. In the present study, phospholipase A2 (Bt-PLA2) cDNA was cloned, and a mature form of Bt-PLA2 was purified from bumblebee venom (Bombus terrestris). The differentiation induction and apoptosis induction activities of Bt-PLA2 on chronic myelogenous leukemia (CML) K562 cells were also evaluated. Bt-PLA2 cDNA has 540 nucleotides that encode a 180-amino-acid protein. The purified, mature form of Bt-PLA2 was an 18-kDa protein, and it inhibited K562 cell growth, determined by an IC50 value of 29.5 ng/μl. Moreover, Bt-PLA2 induced erythroid differentiation of K562 cells in a dose-dependent manner, and this was supplemented with the upregulation of glycophorin A (GPA) mRNA expression. Bt-PLA2- induced apoptosis, analyzed by DAPI staining, was correlated with the result analyzed by AnnexinV-FITC/PI binding. Furthermore, activation of caspase 3 and poly ADP-ribose polymerase (PARP) and inhibition of p-Akt, determined by western blot, further demonstrated that Bt-PLA2 induced apoptosis mainly through the Akt pathway. The parallel induction of erythroblasts differentiation of K562 cells and apoptosis due to Bt-PLA2 treatment demonstrated the potential use of Bt-PLA2 as an anti-leukemia drug lead.

Preparation and Investigation of Ulex Europaeus Agglutinin IConjugated Liposomes as Potential Oral Vaccine Carriers

KeXin Li,DaWei Chen,XiuLi Zhao,HaiYang Hu,ChunRong Yang,DaHai Pang 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.11

We prepared and optimized Ulex europaeus agglutinin I (UEAI)-modified Bovine serum albumin (BSA)-encapsulating liposomes (UEAI-LIP) as oral vaccine carriers and examined the feasibility of inducing systemic and mucosal immune responses by oral administration of UEAILIP. The prepared systems were characterized in vitro for their average size, zeta potential,encapsulation efficiency (EE%) and conjugation efficiency (CE%). In vitro release studies indicated that the presence of UEAI around the optimized liposomes was able to prevent a burst release of loaded BSA and provide sustained release of the encapsulated protein. In vivo immune-stimulating results in KM mice showed that BSA given intramuscularly generated systemic response only but both systemic and mucosal immune responses could be induced simultaneously in the groups in which BSA-loaded liposomes (LIP) and UEAI-LIP were administered intragastrically. Furthermore, the modification of UEAI on the surface of liposomes could further enhance the IgA and IgG levels obviously. In conclusion, this study demonstrated the high potential of lectin-modified liposomes containing the antigen as carriers for oral vaccine.

Experimental Study on Bond Behavior between Section Steel and RAC under Full Replacement Ratio

Chao Liu,Ziyu Fan,Xiaona Chen,Chao Zhu,Haiyang Wang,Guoliang Bai 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.3

Nine specimens of steel reinforced recycled concrete are designed to explore the effect of four factors as the cover thickness of section steel, the embedded length of section steel, the recycled aggregate concrete strength, and the lateral stirrup ratio on bond slip between section steel and recycled aggregate concrete. The test results show that the failure modes of recycled aggregate concrete are as similar as normal concrete; three formulas are proposed for the bond stress between section steel and recycled aggregate concrete, which are fitting well. The mathematical model of bond stress-slip is established through analysis, and the predicted curve is close to the test curve. The research results provide the basis for the numerical simulation analysis of the bond slip for the recycled aggregate concrete under the full replacement ratio.