Characteristics and Historical Stages for the Development of Secondary School Mathematics Classroom Teaching in China during 20th Century

( Yu Bo ),( Song Naiqing ) 한국수학교육학회 2011 수학교육연구 Vol.15 No.2

During the 20th century, the secondary school mathematics teaching in China had been developing from the an old-style private school form with individual instruction to classroom teaching with Chinese characteristics, which experienced three stages of development; the stage for the formation of modern teaching system (1902-1949), the stage for development (1950-1976), and the stage for innovation (1977-2000).The characteristics and journey for the transformation will exert great for reference and effects for the reform of secondary school mathematics teaching nowadays.

Cognitive Human Resource Allocation Mechanism based on Game Theory

Yu Bo 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.10

To overcome the “prematurity” of standard particle swarm optimization in scheduling problem for solution to resource constrained project, an improved cultural particle swarm optimization is proposed. The algorithm framework is based on the main group space of particle swarm optimization and the knowledge space of cultural algorithm, and both spaces have their own spaces and conduct independent and parallel evolvement to form a “dual evolvement and dual promotion” mechanism and increase the global searching ability and operation efficiency of the algorithm. Meanwhile, to avoid the restriction of self-evolvement for the knowledge space of cultural algorithm, the evolvement mechanism of genetic algorithm is introduced to improve the evolvement operation of knowledge space. Finally, the effectiveness of improved cultural particle swarm optimization in solving the problem of resource constrained project can be validated through comparison of example of human resource scheduling.

Economic Dispatching Strategy of Double Lead-acid Battery Packs Considering Various Factors

Yubo Wang,Qingwu Gong 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.1

In this paper, a new energy storage economic dispatch strategy is proposed. Firstly, the equivalent life of a battery is evaluated based on its discharge of depth, and the optimal operation state of the battery is determined. Then, a mathematical model of double battery packs operation is established, which can make the battery closer to the optimal operation state. According to diff erent demand of power supply, two dispatching strategies are proposed. The fi rst strategy considers the reliability of power supply and maximum wind and photovoltaic energy consumption, and the second strategy considers the life of battery energy storage itself. The simulation operations in IEEE33 bus system. And it results show that the above two strategies can prolong the battery life, reduce the energy storage cost, and bring more benefi ts to the energy storage system. The second strategy gains more benefi ts because of more consideration of energy storage itself. Therefore, energy storage equipment, as an auxiliary service equipment, can make the price diff erentials between purchase and sale of electricity lower. So the price more fl exible when it gains profi ts by purchasing electricity at a low price and selling electricity at a high price.

Research on the Wear Mechanism of Ceramic Tool in Turning of Nickel-based Superalloy GH4169

Yubo Liu,Yongde Zhang 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.12

The dry cutting experiment for nickel-based high temperature alloyGH4169 was conducted with Al2O3- SiCw whisker toughening ceramic blade WG300 and Si3N4-Al2O3 ceramics (Sialon) blade SX9. The main wear mechanism of ceramic cutting tools were analyzed by means of observing the wear morphology about cutting tools with scanning electron microscope, and measuring concentration of each element in wear tiny region lying in the ceramic tools with Energy Dispersive Spectrometer(EDS). The results show that the main wear mechanism of ceramic cutting tool was presented by cohesive wear, abrasive wear and oxidation wear. Cohesive wear occurs mainly on the rake face and were influenced by the contact stress state between the contact points of cutting tool and workpiece material.

중국 영상 문화에 끼친 한류의 영향 : 영화와 드라마의 경우를 중심으로

Yubo Zhou 한국방송학회 2005 한국방송학회 세미나 및 보고서 Vol.- No.-

IRI estimation using analysis of dynamic tire pressure and axle acceleration

Yubo Zhao,J. Gregory McDaniel,Ming L. Wang 국제구조공학회 2017 Smart Structures and Systems, An International Jou Vol.19 No.2

A new method is developed to estimate road profile in order to estimate IRI based on the ASTM standard. This method utilizes an accelerometer and a Dynamic Tire Pressure Sensor (DTPS) to estimate road roughness. The accelerometer measures the vertical axle acceleration. The DTPS, which is mounted on the tire\' s valve stem, measures dynamic pressure inside the tire while driving. Calibrated transfer functions are used to estimate road profile using the signals from the two sensors. A field test was conducted on roads with different quality conditions in the city of Brockton, MA. The IRI values estimated with this new method match the actual road conditions measured with Pavement Condition Index (PCI) based on the ASTM standard, images taken from an onboard camera and passengers\' perceptions. IRI has negative correlation with PCI in general since they have overlapping features. Compared to the current method of IRI measurement, the advantage of this method is that a) the cost is reduced; b) more space is saved; c) more time is saved; and d) mounting the two sensors are universally compatible to most cars and vans. Therefore, this method has the potential to provide continuous and global monitoring the health of roadways.

Surface Quality Controlling Research on High Speed Milling Nickel-Based Superalloy Inconel 718

Yubo Liu,Xu Yanfeng,Xi Wang,Wang Xufeng 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.7

Nickel based superalloy Inconel 718 is difficult to machine as a material. The prediction model of surface roughness in high speed milling of Nickel-based Superalloy Inconel 718 was developed based on multiple regression analysis. The model is established from the experiments conducted on a XH714D matching center. The predicted results by using this model agree very well with those obtained from experiments, and the Prediction model of surface roughness of nickel based superalloy can provide a foundation to optimize cutting parameters and control surface quality.

Characteristics of Copper-Clad Aluminum Rods Prepared by Horizontal Continuous Casting

Yubo Zhang,Ying Fu,Jinchuan Jie,Li Wu,Kateryna Svynarenko,Qingtao Guo,Tingju Li,Tongmin Wang 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.6

An innovative horizontal continuous casting method was developed and successfully used to prepare copper-cladaluminum (CCA) rods with a diameter of 85 mm and a sheath thickness of 16 mm. The solidification structure andelement distribution near the interface of the CCA ingots were investigated by means of a scanning electron microscope,an energy dispersive spectrometer, and an electron probe X-ray microanalyzer. The results showed that theproposed process can lead to a good metallurgical bond between Cu and Al. The interface between Cu and Al wasa multilayered structure with a thickness of 200 μm, consisting of Cu9Al4, CuAl2, α-Al/CuAl2 eutectic, and α-Al +α-Al/CuAl2 eutectic layers from the Cu side to the Al side. The mean tensile-shear strength of the CCA sample was45 MPa, which fulfills the requirements for the further extrusion process. The bonding and diffusion mechanismsare also discussed in this paper.

Text Steganography Based on Ci-poetry Generation Using Markov Chain Model

나유박 ( Yubo Luo ),황영봉 ( Yongfeng Huang ),이복방 ( Fufang Li ),장진성 ( Chinchen Chang ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.9

Steganography based on text generation has become a hot research topic in recent years. However, current text-generation methods which generate texts of normal style have either semantic or syntactic flaws. Note that texts of special genre, such as poem, have much simpler language model, less grammar rules, and lower demand for naturalness. Motivated by this observation, in this paper, we propose a text steganography that utilizes Markov chain model to generate Ci-poetry, a classic Chinese poem style. Since all Ci poems have fixed tone patterns, the generation process is to select proper words based on a chosen tone pattern. Markov chain model can obtain a state transfer matrix which simulates the language model of Ci-poetry by learning from a given corpus. To begin with an initial word, we can hide secret message when we use the state transfer matrix to choose a next word, and iterating until the end of the whole Ci poem. Extensive experiments are conducted and both machine and human evaluation results show that our method can generate Ci-poetry with higher naturalness than former researches and achieve competitive embedding rate.

Properties of Aspergillar Xylanase and the Effects of Xylanase Supplementation in Wheat-based Diets on Growth Performance and the Blood Biochemical Values in Broilers

Wu, Yubo,Lai, Changhua,Qiao, Shiyan,Gong, Limin,Lu, Wenqing,Li, Defa Asian Australasian Association of Animal Productio 2005 Animal Bioscience Vol.18 No.1

Three experiments were conducted to study the property of xylanase and the effects of xylanase in wheat-based diets on growth performance of broilers, respectively. Experiment 1 was performed in vitro to evaluate the effect of different pH and temperature on xylanase activity, and to evaluate the enzymic stability under different conditions. The results indicated that the optimum temperature and pH for xylanase activity were $50^{\circ}C$ and 4.5, respectively. The activity of enzyme solution was reduced rapidly after the treatment of water bath above $60^{\circ}C$ for 10 min. The enzyme was relatively stable at pH 3.5 to 8.0 and deteriorated when incubated at pH below 3.5. In Experiment 2, a total of 378 d-old male Arbor Acres broilers were randomly distributed to 7 different treatments with 6 replicates (9 birds) in each treatment. The treatments were as follows: (1) corn based diet (CS), (2) wheat based diet (WS), (3) WS+ 0.05% xylanase, (4) WS+0.15% xylanase, (5) WS+0.25% xylanase, (6) WS+0.35% xylanase, (7) WS+0.45% xylanase. The results showed that the body weight and feed/gain ratio of the broilers fed wheat-based diets have been significantly improved (p<0.05) compared to that fed corn-based diet in the first 3 wk. With regard to the wheat-based diets, the xylanase supplementation had a tendency to improve the growth performance in first 3 wk. After 3 wk, no significant difference (p>0.05) was found among all these different treatments. The supplementation of xylanase and the type of diets did not affect the feed intake but increased the concentration of triglyceride in serum. In Experiment 3, a total of 360 d-old male Arbor Acres broilers were assigned to 30 groups with 12 birds in each group randomly. These groups were then randomly distributed to 5 different treatments with 6 replicates within each treatment. The broilers of each treatment were fed one of the diets as follows: (1) Corn based diet, (2) White wheat based diet (WW) (3) White wheat based diet+0.25% xylanase, (4) Red wheat based diet, (5) Red wheat based diet+0.25% xylanase. The results showed that the body weight and feed/gain ratio had been significantly improved (p<0.05) by xylanase supplementation in the first 2 or 3 wk. The effect of xylanase in red wheat diet is a little higher than that used in white wheat diet. From the results of the present experiments, it can be concluded that the supplementation of Aspergillar xylanase can improve the performance of the broilers fed the wheat-based diet.