Disturbance Rejection Control Method Based on Variable Damping and Port Controlled Hamiltonian with Dissipation Model for Induction Drive Motor

Bo Fan,Guoxing Huang,Lifan Sun,Yi Zhao,Hangyu Zhou,Jianxiang Wang 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.11

The conventional nonlinear control methods for induction motors have the problem of difficult observation of rotor current, and load disturbances make the dynamic performance of the system speed control unsatisfactory. A novel disturbance rejection control scheme with variable damping model based on port controlled Hamiltonian with dissipation is proposed. The induction drive is regarded as energy conversion device including mechanical and electrical ports. The Euler Lagrange equation of the closed-loop system is obtained by the output feedback to establish the energy shaping control method. The variable damping injection is introduced to improve the dynamic performance of the conventional control methods. The L2disturbance rejection controller is designed to enhance the load disturbance resistance performance of induction motors. The experimental results show that the proposed method can optimize the dynamic and steady-state performance of the induction drive control system and effectively meet the control requirements of the speed and torque under load disturbances.

Low-loss carrier-stored IGBT with p-type Schottky diode-clamped shielding layer

Yi, Bo,Zhao, Qing,Zhang, Qian,Cheng, JunJi,Huang, HaiMeng,Pan, YiLan,Hu, XiaoRan,Xiang, Yong The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.8

A novel carrier-stored trench bipolar transistor (CSTBT) with heavily doped carrier-stored layer (CSL) is proposed and investigated by TCAD tools. The voltage of CSL is shielded by a buried p-type layer (P-bury) whose potential is clamped by a p-type Schottky Barrier Diode (pSBD) in series-connection with a PN diode. Hence, the CSL can be heavily doped, and the trade-off between on-state voltage drop (V_on) and turn-off loss (E_off) is substantially improved. Compared with that of a conventional CSTBT with floating P-base (FP-CSTBT), the E_off of the proposed CSTBT is reduced by 27.9% at V_on=1.1 V. Owing to the shielding effect of the P-bury layer, the saturation current density of the proposed CSTBT is reduced by 52% compared with that of the FP-CSTBT. Consequently, significantly enlarged short-circuit safe operation area is obtained, and the short-circuit withstand time (t_sc) is increased to 12.8 s at ultra-low V_on (~1.1 V).

Plastic Deformation Mechanism of the Ti6Al4V Micro-gear Formed Under an Electrical Field

Bo Zeng,Xiangzhong Yan,Zhiqiang Xie,Jian Liu,Jie Wang,Kunlan Huang,Yi Yang 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.11 No.1

Despite the fact that titanium alloy micro-gear has superior performance and can withstand special conditions, it is difficult to machine due to its poor plasticity and high strength. We proposed an eco-friendly, efficient, and sustainable electric field assisted micro-plastic forming technology (micro-EFAPFT) for forming titanium alloy microparts. Ti-6Al-4 V alloy bars were extruded into micro-gears using an electrothermal coupling field and Joule heating in a graphite mold. The micro-gear has high precision, good surface quality, and a simple process. The whole process takes only 380 s. The findings demonstrate that the best gear forming degree, fewer microstructure defects, and hardness reaching 330.1 HV—4.4% higher than that of the raw material—occur when the pressure holding period is 120 s. During the plastic deformation process, phase transformation and recrystallization occur, increasing the fraction of α phase from 96.6–99.68% and increasing the grain orientation difference. The tooth tip has finer grains but longer dislocation lines. In conclusion, the electric field accelerates dislocation motion, reduces dislocation density, and increases material plasticity, allowing the Ti6Al4V micro-gear to be formed in a single step. The experimental results validate the feasibility of this technology for producing titanium alloy micro-gear and can be used to guide the production of different materials and shapes of microparts.

An Adaptive Learning System based on Cloud Computing : Implementation and Evaluation of BDS

Yi Liao,Lei Huang,Hang Zhou,Bo Li 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.8

In this paper, we report the design and implementation of an adaptive individualized e-learning environment based on cloud computing named BDS (Beijing Digital School). With its five-layer architecture and its use of cloud computing technology, BDS possesses the characteristics of both a massive access system and an adaptive e-learning environment. This paper focuses on investigating three distributed solutions proposed for load balancing: an active clustering algorithm, a random algorithm and a honey bee foraging algorithm. An experiment comparing 2 groups of students was conducted to evaluate the impact of the proposed environment on learning performance, and the results were analyzed to determine the most effective strategy.

A Discovery of Low Hydraulic Resistance Channel Along Meridians

Wei-Bo Zhang,Yu-Ying Tian,Hong Li,Jia-He Tian,Ming-Fu Luo,Fa-Liang Xu,Guang-Jun Wang,Tao Huang,Yi-Hui Xu,Rui-Hong Wang 사단법인약침학회 2008 Journal of Acupuncture & Meridian Studies Vol.1 No.1

A hydro-mechanic model was put forward to study the fundamental nature of acupuncture meridians. The basic state of low hydraulic resistance was tested on humans and mini pigs using three methods. The first, a modified Guyton’s method, proved that there was lower hydraulic resistance on meridians compared with nonmeridians. The second scanning method involved a single pressure transducer that can find the lowest resistance point in tissue, and the third method used two transducers and provided a more stable measurement. Using the latter method, low hydraulic resistance points were found very close to low impedance points along meridians. The transmission of artificial interstitial fluid pressure waves was measured to examine their connection to the low resistance points, with the result that a good connection between the points was confirmed. This means the points form channels along the meridians that we refer to as low hydraulic resistance channels. The channel was imaged through isotopic tracing and a migration of isotope 99mTe could be found along the channel. The layer of the channel was detected by injecting Alcian blue and the track was found beneath the skin. All of the above experiments suggest the existence of a new type of channel in living tissues that has not yet been described in modern science, but coincides quite well with the Qi channel theory of traditional Chinese medicine. A hydro-mechanic model was put forward to study the fundamental nature of acupuncture meridians. The basic state of low hydraulic resistance was tested on humans and mini pigs using three methods. The first, a modified Guyton’s method, proved that there was lower hydraulic resistance on meridians compared with nonmeridians. The second scanning method involved a single pressure transducer that can find the lowest resistance point in tissue, and the third method used two transducers and provided a more stable measurement. Using the latter method, low hydraulic resistance points were found very close to low impedance points along meridians. The transmission of artificial interstitial fluid pressure waves was measured to examine their connection to the low resistance points, with the result that a good connection between the points was confirmed. This means the points form channels along the meridians that we refer to as low hydraulic resistance channels. The channel was imaged through isotopic tracing and a migration of isotope 99mTe could be found along the channel. The layer of the channel was detected by injecting Alcian blue and the track was found beneath the skin. All of the above experiments suggest the existence of a new type of channel in living tissues that has not yet been described in modern science, but coincides quite well with the Qi channel theory of traditional Chinese medicine.

Numerical calculation of irregular tire wear caused by tread self-excited vibration and sensitivity analysis

Hai-bo Huang,Yi-Jui Chiu,Xiao-xiong Jin 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.7

Tire wear negatively affects vehicle safety and riding comfort. Abnormal wear is more dangerous and wears tires out more quickly. In this paper, numerical and sensitivity analyses of polygonal wear caused by unstable vibration are presented. The model used for this study was based on the works of Sueoka. Tread self-excited vibration was analyzed in a quantitative sense, which was qualitatively different from the work of Sueoka. Wear was plotted on tire circumference visually. The mechanism governing polygonal tire wear was investigated as that both the polygonal wear and the standing wave are caused by two types of tread vibrations that only differ in the extent of the tread vibration. Sensitivity analysis shows that decreases in tread mass and stiffness and increases in tread damping lead to noticeable reductions in tire wear. This information could help tire manufacturers produce tires that exhibit less wear caused by tread vibration.

Mutation of IPO13 causes recessive ocular coloboma, microphthalmia, and cataract

Xiu-Feng Huang,Lue Xiang,Wan Cheng,Fei-Fei Cheng,Kai-Wen He,Bo-Wen Zhang,Si-Si Zheng,Ru-Yi Han,Yi-Han Zheng,Xiao-Tao Xu,Huan-Yun Yu,Wenjuan Zhuang,Yuk Fai Leung,Zi-Bing Jin 생화학분자생물학회 2018 Experimental and molecular medicine Vol.50 No.-

Ocular coloboma is a developmental structural defect of the eye that often occurs as complex ocular anomalies. However, its genetic etiology remains largely unexplored. Here we report the identification of mutation (c.331C>T, p. R111C) in the IPO13 gene in a consanguineous family with ocular coloboma, microphthalmia, and cataract by a combination of whole-exome sequencing and homozygosity mapping. IPO13 encodes an importin-B family protein and has been proven to be associated with the pathogenesis of coloboma and microphthalmia. We found that Ipo13 was expressed in the cornea, sclera, lens, and retina in mice. Additionally, the mRNA expression level of Ipo13 decreased significantly in the patient compared with its expression in a healthy individual. Morpholinooligonucleotide- induced knockdown of ipo13 in zebrafish caused dose-dependent microphthalmia and coloboma, which is highly similar to the ocular phenotypes in the patient. Moreover, both visual motor response and optokinetic response were impaired severely. Notably, these ocular phenotypes in ipo13-deficient zebrafish could be rescued remarkably by full-length ipo13 mRNA, suggesting that the phenotypes observed in zebrafish were due to insufficient ipo13 function. Altogether, our findings demonstrate, for the first time, a new role of IPO13 in eye morphogenesis and that loss of function of IPO13 could lead to ocular coloboma, microphthalmia, and cataract in humans and zebrafish.

Effect of temperature on survival and immature development of Arma chinensis

Xia Peng-Liang,Wang Bo,Xie Xiao-Fei,Feng Yi,Huang Yong 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.3

Arma chinensis (Fallou) is a predaceous pentatomid with the potential to control a wide range of insect pests. In this study, the stage-specific temperature-dependent development and survival of A. chinensis was investigated under seven constant temperatures (range 18–35 ◦ C) when fed with yellow mealworm (Tenebrio molitor L.). Developmental times (in days) for the immature stage, entire nymphal stage, and egg-to-adult development were inversely proportional to temperatures between 18 and 33 ◦ C (30 ◦ C for eggs and 1st instar nymphs). The lowest survival rate of A. chinensis was observed at 18 ◦ C (6.7%), whereas it was the highest (80–93.3%) at temperatures ranging from 21 to 24 ◦ C. The low temperature thresholds for the egg, entire nymph stage, and egg-to-adult development were 14.3, 12.28, and 12.8 ◦ C, respectively, while the thermal constants for these stages were estimated to be 85.47, 334.9, and 423.8 ◦ days. Among the three non-linear models examined, the Taylor model showed the best fit for the egg data, the Briére1 model was the best fit for the 1st instar nymph stage, and the Lactin1 model was more approprate for all the other instar stages, the entire nymphal stage, and overall development. The upper temperature thresholds estimated using the Lactin1 model for eggs, overall nymphal stage, and egg-to-adult development were 38.57, 38.9, and 40.0 ◦ C. The optimal temperature for the overall eggto-adult period was estimated to be 33.5 ◦ C. The results of this study can be used for the mass rearing of this natural pest enemy and development of phenology models of its seasonal progress.

A Novel Flow Diverter (Tubridge) for the Treatment of Recurrent Aneurysms: A Single-Center Experience

Yongxin Zhang,Qing-Hai Huang,Yibin Fang,Pengfei Yang,Yi Xu,Bo Hong,Jianmin Liu 대한영상의학회 2017 Korean Journal of Radiology Vol.18 No.5

Objective: The Tubridge flow diverter (FD) is a novel device aimed at reconstructing the parent artery and occluding complex aneurysms. Retreatment of recurrent aneurysms using the FD is challenging. We report our initial experience in the repair of aneurysm recurrence with the FD. Materials and Methods: A database was reviewed prospectively, and 8 patients with 8 recurrent aneurysms (mean size, 16.7 mm) were identified. Four aneurysms had previously ruptured. The previous aneurysm treatment consisted of coiling in 1 aneurysm and single-stent-assisted coiling in 7 aneurysms. The procedural complications and clinical and angiographic outcomes were analyzed. Results: Six aneurysms were treated by using a single Tubridge FD alone, while the remaining 2 were treated with FD + coiling. The immediate results of the 8 aneurysms were that they all showed incomplete occlusion. Neither major ischemic nor hemorrhagic complications occurred; however, 1 patient experienced a vasospasm. Follow-up angiographies were available for 7 aneurysms; the mean follow-up was 16.9 months (7–36 months). Five aneurysms were completely occluded, whereas 2 had a residual neck. Severe asymptomatic stenosis of 1 parent artery of a vertebral artery dissecting aneurysm was found. All visible branches covered by the FD were patent. All patients were clinically assessed as having attained a favorable outcome (modified Rankin Scale score ≤ 2) at discharge and follow-up. Conclusion: In selected patients, the Tubridge FD can provide a safe and efficient option for the retreatment of recurrent aneurysms. Nevertheless, attention should be paid to several technical points.

A Novel Acid-Stable Endo-Polygalacturonase from Penicillium oxalicum CZ1028: Purification, Characterization, and Application in the Beverage Industry

( Zhong Cheng ),( Dong Chen ),( Bo Lu ),( Yutuo Wei ),( Liang Xian ),( Yi Li ),( Zhenzhen Luo ),( Ribo Huang ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.6

Acidic endo-polygalacturonases are the major part of pectinase preparations and extensively applied in the clarification of fruits juice, vegetables extracts, and wines. However, most of the reported fungal endo-polygalacturonases are active and stable under narrow pH range and low temperatures. In this study, an acidic endo-polygalacturonase (EPG4) was purified and characterized from a mutant strain of Penicillium oxalicum. The N-terminal amino acid sequence of EPG4 (ATTCTFSGSNGAASASKSQT) was different from those of reported endopolygalacturonases. EPG4 displayed optimal pH and temperature at 5.0 and 60-70°C towards polygalacturonic acid (PGA), respectively, and was notably stable at pH 2.2-7.0. When tested against pectins, EPG4 showed enzyme activity over a broad acidic pH range (>15.0% activity at pH 2.2-6.0 towards citrus pectin; and >26.6% activity at pH 2.2-7.0 towards apple pectin). The Km and Vmax values were determined as 1.27 mg/ml and 5,504.6 U/mg, respectively. The enzyme hydrolyzed PGA in endo-manner, releasing oligo-galacturonates from PGA, as determined by TLC. Addition of EPG4 (3.6 U/ml) significantly reduced the viscosity (by 42.4%) and increased the light transmittance (by 29.5%) of the papaya pulp, and increased the recovery (by 24.4%) of the papaya extraction. All of these properties make the enzyme a potential application in the beverage industry.