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Jingjing Guo,Zhongpo Zhou,Tianxing Wang,Zhansheng Lu,Zongxian Yang,Chang Liu 한국물리학회 2017 Current Applied Physics Vol.17 No.12
In this paper, first-principle calculations based on density functional theory are carried out to explore the interface properties of the blue phosphorene/graphene-like GaN van der Waals heterostructures. The edge positions for valence and conduction band of blue phosphorene and graphene-like GaN nanosheets change with the Fermi energy level and form the type-II heterostructure. The internal electric field facilitates the separation of electronhole pairs and restrained the carrier recombination in the blue phosphorene/graphene-like GaN interfaces.
A Rabbit Farm Environmental Monitoring System based on Internet of Things
Jingjing Yang,Cunxin Li,Xiao Zhang,Benzhen Guo 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.3
On account of the low degree of automation in a rabbit farm, this paper proposes a rabbit farm environmental monitoring system based on internet of things. First, this paper designs a rabbit farm environmental monitoring system according to the three-tier architecture of the internet of things. Then it chooses a wireless transmission module as required by the system in addition to the proposal of a new gateway initialization flow for the internet of things. After that, it analyzes the flow to query the farm monitoring data and the flow of reverse control on the environmental parameters to verify finally the feasibility of the system through the experiment.
Total Synthesis of Hoiamide A Using an Evans-Tishchenko Reaction as a Key Step
Guo, Yian,Zhou, Jingjing,Gao, Bowen,Zhao, Meng,Yan, Jia-Lei,Xu, Zhengshuang,Choi, Sun,Ye, Tao THE AMERICAN CHEMICAL SOCIETY 2019 ORGANIC LETTERS Vol.21 No.14
<P>The first total synthesis of neurotoxic cyclodepsipeptide hoiamide A (<B>1</B>) has been accomplished. The synthesis features the use of an Evans-Tishchenko fragment coupling between a five-stereogenic-center-containing β-hydroxyketone and a chiral aldehyde derived from threonine.</P> [FIG OMISSION]</BR>
An Improvement to the Algorithm of Human Body Detection in Video Surveillance
Jingjing Yang,Benzhen Guo,Xiao Zhang 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.12
Human body detection in video surveillance is an important research point, which has been devoted for many years by researchers. But it can’t detect human body with the feature of HoG and classifier of SVM. This paper proposes an improvement measure to the traditional algorithm of human body detection in order to detect human body in video surveillance in real time. Through the Integral images to speed up the computation of features of HoG and HoD under the condition of Kinect, It can’t detect human body in video surveillance in real time. As human body detection using HoG features can’t meet the real-time requirement in the current time. This paper abandon the time-consuming processing of computing features of HoG with three line interpolation and Gauss filter in terms of traditional algorithm of human body detection, and This paper introduces the notion of Integral images to speed up the computation of the features of HoG and HoD with the help of Kinect. As a result, Our improved algorithm can get a better time performance than ever, which can get the average detection rate of 30~40 FPS, current performance getting promotion greatly than ever, under the condition of CPU 3.10Ghz, RAM 4 GB, 640*480 detection window.
Research on Home Healthcare Management System Based on the Improved Internet of Things Architecture
Benzhen Guo,Beibei Dong,Xiao Zhang,Jingjing Yang,Zhihui Wang 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.9
This paper designs an improved internet of things architecture to redefine the internet of things architecture into the node domain, the network domain and the application domain so as to design and implement a home healthcare management system based on this improved internet of things architecture. In this way, all of the equipments characterized with Zigbee communication function in the blood pressure measuring node, the blood oxygen measuring node and the ECG measuring node can be connected to the internet through the Zigbee-Wifi gateway. Meanwhile data uploaded by the users can be stored and analyzed on the backend server of the internet of things so that the users can review their health data and control the node devices through the intelligent terminals such as cell phone etc. Taking the blood pressure measurement as an instance, the experiment has proved the feasibility and reliability of this system.
Research on the Internet of Things-based Auxiliary Infant Feeding System
Benzhen Guo,Jingjing Yang,Xiao Zhang,Yu Liu,Shangfu Hao,Kezhong Yang 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.12
Nowadays young parents are found deficient in the skills to take care of their infants due to the quick pace of modern life and the heavy working stress. Actually it has become one of the problems that perplex young parents when they have no idea about the amount of milk given to the infants each time, unsure about the temperature of milk, often forgetting to feed the infants on schedule or even making the infants choke on milk during the feeding. In view of this, this paper utilizes the internet of things technology to implement an intelligent infant feeding system, which can provide real-time monitoring on the temperature of nursing bottle, checking if the bottle has tilted or seriously tilted in addition to memorizing the feeding times. The measured information and data will be uploaded to the background server after the access to the household internet of things gateway via zigbee. Then the parents can configure the working state of the nursing bottle and receive the warning message on their smart phones. With the design of the hardware, the structure and the software system of the intelligent nursing bottle, this paper takes the intelligent nursing bottle as a node device for the connection to the household internet of things and conducts the experimental verification. The verification result proves that this technology is feasible and able to guarantee a stable operation.
Benzhen Guo,Jingjing Yang,Zhihui Wang 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.7
Since rabbit house is completely enclosed, then the environmental factors such as temperature, humidity, harmful gas and illumination etc will affect severely the health and the reproductive function of the rabbit. In view of this, it has been one of the important measures to improve the economic benefits of rabbit farming through the manual intervention on the micro-climate in the rabbit house. In this paper, it designs a rabbit house temperature regulation system to adjust the temperature of the rabbit house through the water curtain filtration and negative-pressure ventilation method. Also it utilizes the internet of things technology to implement remote management on the regulation system when the data about the temperature and humidity information in every rabbit house and the harmful gas concentration is uploaded to the background server via wifi connection to the network to enable the poultry feeders to make a real-time observation on the environmental information of the rabbit house in addition to the remote control of the water curtain and the running of the blower on their smart phones. Furthermore, it builds a model for the rabbit house temperature with the application of the fuzzy-PID control algorithm and the variable frequency drive technology to design a controller for the further decline in the system power consumption based on the optimal control. In addition to these, a prototype system has been established to conduct the experimental verification. The verification result proves that this system can be controlled reliably with technical feasibility.
( Ying Guo ),( Xiaoyue Kang ),( Qinghe Han ),( Jingjing Wang ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.10
Node localization is the basic task of underwater wireless sensor networks (UWSNs). Most of the existing underwater localization methods rely on ranging accuracy. Due to the special environment conditions in the ocean, beacon nodes are difficult to deploy accurately. The narrow bandwidth and high delay of the underwater acoustic communication channel lead to large errors. In order to reduce the ranging error and improve the positioning accuracy, we propose a localization algorithm based on ranging correction and inertial coordination. The algorithm can be divided into two parts, Range Correction based Localization algorithm (RCL) and Inertial Coordination based Localization algorithm (ICL). RCL uses the geometric relationship between the node positions to correct the ranging error and obtain the exact node position. However, when the unknown node deviates from the deployment area with the movement of the water flow, it cannot communicate with enough beacon nodes in a certain period of time. In this case, the node uses ICL algorithm to combine position data with motion information of neighbor nodes to update its position. The simulation results show that the proposed algorithm greatly improves the positioning accuracy of unknown nodes compared with the existing localization methods.
( Hongwei Guo ),( Jinyao Han ),( Jingjing Wu ),( Hongwen Chen ) 한국미생물생명공학회(구 한국산업미생물학회) 2019 Journal of microbiology and biotechnology Vol.29 No.4
The engineered Aspergillus oryzae has a high NADPH demand for xylose utilization and overproduction of target metabolites. Glucose-6-phosphate dehydrogenase (G6PDH, E.C. 1.1.1.49) is one of two key enzymes in the oxidative part of the pentose phosphate pathway, and is also the main enzyme involved in NADPH regeneration. The open reading frame and cDNA of the putative A. oryzae G6PDH (AoG6PDH) were obtained, followed by heterogeneous expression in Escherichia coli and purification as a his6-tagged protein. The purified protein was characterized to be in possession of G6PDH activity with a molecular mass of 118.0 kDa. The enzyme displayed maximal activity at pH 7.5 and the optimal temperature was 50°C. This enzyme also had a half-life of 33.3 min at 40°C. Kinetics assay showed that AoG6PDH was strictly dependent on NADP+ (K<sub>m</sub> = 6.3 μM, k<sub>cat</sub> = 1000.0 s<sup>-1</sup>, k<sub>cat</sub>/K<sub>m</sub> =158.7 s<sup>-1</sup>·μM<sup>-1</sup>) as cofactor. The K<sub>m</sub> and k<sub>cat</sub>/K<sub>m</sub> values of glucose-6-phosphate were 109.7 s<sup>-1</sup>·μM<sup>-1</sup> and 9.1 s<sup>-1</sup>·μM<sup>-1</sup> respectively. Initial velocity and product inhibition analyses indicated the catalytic reaction followed a two-substrate, steady-state, ordered BiBi mechanism, where NADP<sup>+</sup> was the first substrate bound to the enzyme and NADPH was the second product released from the catalytic complex. The established kinetic model could be applied in further regulation of the pentose phosphate pathway and NADPH regeneration of A. oryzae to improve its xylose utilization and yields of valued metabolites.