Rational quartic Said-Ball Conics

Qian-Qian Hu,Guo-Jin Wang (사)한국CDE학회 2007 한국CAD/CAM학회 국제학술발표 논문집 Vol.2007 No.8

Stepping Motor-Based Position Controller For Orbitrol In A Tractor Steering System

Hu Qian Yu 강원대학교 농업생명과학연구원(구 농업과학연구소) 2009 강원 농업생명환경연구 Vol.21 No.-

One of the most important of automation technology is agricultural vehicle guidance system, the fundamental element of this technology includes the global positioning system (GPS), automatic steering control system, Machine vision etc. In this paper, the development of an automatic controller for the tractor steering system was described. In order to make the manual steering system to be automatically controlled, a stepping motor controlled orbitrol steering system was developed on a 68 hp-rate tractor-T680 (Tongyangmoolsan, Korea), this system consists of steering electronic control unit (ECU)-consisting of cFP-2020 (National Instruments Corporation, USA), hydraulic steering system, stepping motor, stepping motor driver, pressure sensors, flow rate sensor, position sensor and angle sensor. Accurate position control on steering cylinder has been achieved by controlling the stepping motor depending on the instructions from the computer (that is, the computer which was installed LabVIEW program software for automatic steering control). The major factors which affect the performance of steering system were investigated in the research. When the orbitrol rotation speed was fixed, the cylinder speed increased with increasing of flow rate from 6.9 lpm to 9.5 lpm, there was a linear relationship between cylinder speed and flow rate, but when flow rate was larger than 9.5 lpm, the cylinder speed would not increase with the increased flow rate. Also, it was found that the shortest time for moving the cylinder from left most to right most was about 2.1 s at the maximum cylinder speed of 10.53 cm/s. It was also found that there was a linear relationship between cylinder speed and orbitrol rotation speed. Open-loop control method was tested in this research, finally, we calculated the formula depending on the result and used that formula, the error would be controlled in ± cm, if the controlled tractor don`t need to precise control, then the open-loop control can be used or we should study in depth with open-loop controller. During the experiment, a dynamic model was developed using simulink/Matlab. through comparing with experimental results under the same flow rate and pressure, the model was proved valid. The LabVIEW program with PD algorithm in the dynamic model simulation works well in controlling overshoot, but not good at controlling steady-state error with increased flow rate, and no difference on rising time, it showed that PD control was suitable for the step motor controlled orbitrol steering system. It was also found that while external load force (average 0~2400 N) acting as friction nearly does not affect the performance of orbitrol controlled steering system, so that the orbitrol controlled steering system can be sure to work well like human or better. Through the experiment, it was proved that this system can be used as the steering control for automatic operating/assistant vehicle with the merits of great torque, high control precision, quick response, energy-saving and so on.

Preparation of Nanoflake Bi₂MoO₆ Photocatalyst Using CO(NH₂)₂ as Structure Orientation and Its Visible Light Degradation of Tetracycline Hydrochloride

Hu, Pengwei,Zheng, Dewen,Xian, Yuxi,Hu, Xianhai,Zhang, Qian,Wang, Shanyu,Li, Mingjun,Cheng, Congliang,Liu, Jin,Wang, Ping Materials Research Society of Korea 2021 한국재료학회지 Vol.31 No.6

Bi₂MoO₆ (BMO) via the structure-directing role of CO(NH₂)₂ is successfully prepared via a facile solvothermal route. The structure, morphology, and photocatalytic performance of the nanoflake BMO are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), fluorescence spectrum analysis (PL), UV-vis spectroscopy (UV-vis) and electrochemical test. SEM images show that the size of nanoflake BMO is about 50 ~ 200 nm. PL and electrochemical analysis show that the nanoflake BMO has a lower recombination rate of photogenerated carriers than particle BMO. The photocatalytic degradation of tetracycline hydrochloride (TC) by nanoflake BMO under visible light is investigated. The results show that the nanoflake BMO-3 has the highest degradation efficiency under visible light, and the degradation efficiency reached 75 % within 120 min, attributed to the unique hierarchical structure, efficient carrier separation and sufficient free radicals to generate active center synergies. The photocatalytic reaction mechanism of TC degradation on the nanoflake BMO is proposed.

중국유학생의 한국 유입 급증에 따른 대안 모색

호세전 ( Hu Shi Qian ),구기보 ( Ki Bo Ku ) 한중사회과학학회 2010 한중사회과학연구 Vol.8 No.3

This paper focuses on understanding various problems facing Chinese students in Korea`s universities, reviewing Japan`s policy against overseas students and drawing policy implications concerning Chinese students in Korea. It is necessary that the Korean government and the universities in Korea should prepare the following measures. First, the Korean government and the universities in Korea should propose overall blueprints including entrance into school, the period of attendance at school and after graduation. And then, the government should propose the guidelines and policy assistance helping every university admit some students. Finally, each university should prepare the specialized strategy in granting admission to overseas students. It is desirable that the universities specialize in majors having relative advantage and grant admission to overseas students to apply for those kinds of majors.

Development of SSR molecular markers for Allium mongolicum

Jing Hu,Xiaoke Hu,Qian Zhang,Jinhu Zhang,Baoli Fan,Qiushi Yu 한국유전학회 2017 Genes & Genomics Vol.39 No.12

Allium mongolicum is high palatability, nutrient, medicinal value and drought resistance wild plant. However, a lack of molecular markers of this plant results in a series of genetic questions remain largely unknown, including molecular marker data, population genetic structure and accuracy of genetic breeding. In this study, a total of 1,409,706 quality- filtered and trimmed reads were obtained from the normalized genomic DNA of pooled A. mongolicum individuals. These sequences were assembled into 2,093,593 high quality contigs, and a total of 219 simple sequence repeats loci were screened. Sixty of them were selected to validate amplification and to determine the degree of polymorphism in the genomic DNA pools. Fifteen primer pairs successfully amplified DNA fragments and detected significant amounts of polymorphism. The number of alleles in ten geographically diverse A. mongolicum populations ranged from 3 to 8 per locus. The observed and expected heterozygosities ranged from 0.350 to 0.860 and 0.516 to 0.931, respectively. Our results provide a valuable resource for A. mongolicum research.

Identification of polymorphic loci in the deiodinase 2 gene and their associations with head dimensions in geese

Deng, Yan,Hu, Qian,Tang, Bincheng,Ouyang, Qingyuan,Hu, Shenqiang,Hu, Bo,Hu, Jiwei,He, Hua,Chen, Guohong,Wang, Jiwen Asian Australasian Association of Animal Productio 2022 Animal Bioscience Vol.35 No.5

Objective: This study was conducted to clone and compare the molecular characteristics of the deiodinase 2 (DIO2) gene between Sichuan White geese and Landes geese, and to analyze the association between polymorphisms of the DIO2 gene and head dimensions in Tianfu meat geese. Methods: The coding sequence of the DIO2 gene was cloned by polymerase chain reaction and vector ligation and aligned by DNAMAN software. A total of 350 Tianfu meat geese were used to genotype the polymorphisms of the DIO2 gene and measure the head dimensions. Association analysis between the polymorphisms of the DIO2 gene and head dimensions was carried out. Results: An 840-bp coding sequence of the DIO2 gene was obtained and comparison analysis identified four polymorphic loci between Sichuan White geese and Landes geese. Further analysis showed that the dominant alleles for the four polymorphic loci were G, G, A, and T and the frequency of the heterozygous genotype was higher than that of the homozygous genotype in Tianfu meat geese. Compared to that in the population of non-knob geese of Tianfu meat geese, the head dimensions in the population of knob geese were significantly higher except for nostril height. However, in the non-knob geese, beak width 1, beak width 2, nostril length, cranial width 1, and maxillary length had significant differences among different genotypes or haplotypes/diplotypes. Conclusion: These results suggested that polymorphisms of the DIO2 gene could be considered molecular markers to select larger heads of geese in the population of non-knob geese.

새마을운동 거버넌스의 중국적 적용

호세전 ( Shi Qian Hu ) 고려대학교 한국사회연구소 2010 한국사회 Vol.11 No.2

ROCK1 induces dopaminergic nerve cell apoptosis via the activation of Drp1-mediated aberrant mitochondrial fission in Parkinson’s disease

Qian Zhang,Changpeng Hu,Jingbin Huang,Wuyi Liu,Wenjing Lai,Faning Leng,Qin Tang,Yali Liu,Qing Wang,Min Zhou,Fangfang Sheng,Guobing Li,Rong Zhang 생화학분자생물학회 2019 Experimental and molecular medicine Vol.51 No.-

Dopamine deficiency is mainly caused by apoptosis of dopaminergic nerve cells in the substantia nigra of themidbrain and the striatum and is an important pathologic basis of Parkinson’s disease (PD). Recent research has shownthat dynamin-related protein 1 (Drp1)-mediated aberrant mitochondrial fission plays a crucial role in dopaminergicnerve cell apoptosis. However, the upstream regulatory mechanism remains unclear. Our study showed that Drp1knockdown inhibited aberrant mitochondrial fission and apoptosis. Importantly, we found that ROCK1 was activated inan MPP+-induced PD cell model and that ROCK1 knockdown and the specific ROCK1 activation inhibitor Y-27632blocked Drp1-mediated aberrant mitochondrial fission and apoptosis of dopaminergic nerve cells by suppressing Drp1dephosphorylation/activation. Our in vivo study confirmed that Y-27632 significantly improved symptoms in a PDmouse model by inhibiting Drp1-mediated aberrant mitochondrial fission and apoptosis. Collectively, our findingssuggest an important molecular mechanism of PD pathogenesis involving ROCK1-regulated dopaminergic nerve cellapoptosis via the activation of Drp1-induced aberrant mitochondrial fission.

Controlled-Type ZVS Technique without Auxiliary Components for Micro-inverters

Qian Zhang,Dehua Zhang,Haibing Hu,John Shen,Issa Batarseh 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.6

This paper proposes a Boundary Current Mode (BCM) control scheme to realize soft switching on a conventional single phase full bridge DC/AC inverter. This technique with the advantages of no auxiliary components, low cost, high efficiency, and simple in control, is attractive for micro-inverter applications. The operation principle and characteristic waveforms of the proposed soft switching technique are analyzed in theory. A digital controller is provided based on that theory. To balance the requirements of efficiency, switching frequency, and inductor size, the design considerations are discussed in detail to guide in BCM inverter construction. A 150W prototype is built under these guidelines to implement the BCM control scheme. Simulation and experiment results demonstrate the feasibilities of the proposed soft switching technique.

DISCOVERY OF AN X-RAY-EMITTING CONTACT BINARY SYSTEM 2MASS J11201034−2201340

Hu, Chin-Ping,Yang, Ting-Chang,Chou, Yi,Liu, L.,Qian, S.-B.,Hui, C. Y.,Kong, Albert K. H.,Lin, L. C. C.,Tam, P. H. T.,Li, K. L.,Ngeow, Chow-Choong,Chen, W. P.,Ip, Wing-Huen American Astronomical Society 2016 The Astronomical journal Vol.151 No.6

<P>We report the detection of orbital modulation, a model solution, and the X-ray properties of a newly discovered contact binary, Two Micron All Sky Survey (2MASS) J11201034-2201340. We serendipitously found this X-ray point source outside the error ellipse when searching for possible X-ray counterparts of 7-ray millisecond pulsars among the unidentified objects detected by the Fermi Gamma-ray Space Telescope. The optical counterpart of the X-ray source (unrelated to the 7-ray source) was then identified using archival databases. The long-term Catalina Real-Time Transient Survey detected a precise signal with a period of P = 0.28876208 (56) days. A follow-up observation made by the Super Light Telescope of Lulin Observatory revealed the binary nature of the object. Utilizing archived photometric data of multi-band surveys, we construct the spectral energy distribution (SED), which is well fit by a K2V spectral template. The fitting result of the orbital profile using the Wilson Devinney code suggests that 2MASS J11201034-2201340 is a short-period A-type contact binary and the more massive component has a cool spot. The X-ray emission was first noted in observations made by Swift, and then further confirmed and characterized by an XMM-Newton observation. The X-ray spectrum can be described by a power law or thermal Bremsstrahlung. Unfortunately, we could not observe significant X-ray orbital modulation. Finally, according to the SED, this system is estimated to be 690 pc from Earth with a calculated X-ray intensity of (0.7 - 1.5) x 10(30) erg s(-1), which is in the expected range of an X-ray emitting contact binary.</P>