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.

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.

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.

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.

중국 영상 문화에 끼친 한류의 영향 : 영화와 드라마의 경우를 중심으로

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

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.

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.

유니버설디자인 관점의 헬스기구 디자인에 관한 연구

왕우박(Yubo Wang),김원섭(Wonsup Kim) 한국디자인학회 2021 한국디자인학회 학술발표대회 논문집 Vol.2021 No.5

고령자와 비만집단을 위한 헬스기구의 디자인에 관한 연구

왕우박 ( Yubo Wang ),조광수 ( Kwangsoo Cho ) 한국산업디자이너협회(한국인더스트리얼디자인학회) 2019 산업디자인학연구 Vol.13 No.2

매년 지속적으로 증가하는 고령자 문제와 더불어, 경제적 여건의 호전으로 신체적 영양상태가 향상된 반면 활동량 부족으로 나타나는 비만도 사회적 문제로 나타나기 시작하였다. 이 두 가지 문제 모두 건강과 관련되어 있으며, 이를 위해 매년 많은 고령자와 비만자들이 운동을 통해 건강을 지키려고 노력하고 있다. 많은 고령자들과 비만자들이 건강한 삶을 위해 헬스기구를 사용하고 있으나 그들이 사용하는 헬스 기구가 이들을 위해 적정 디자인으로 판단하기는 어렵다. 본 연구의 목적은 일반인은 헬스기구의 사용에 부정적인 영향이 없고 동시에 비만집단과 고령자도 편하게 사용할 수 있는 거부감이 없는 헬스기구를 디자인하는 연구를 진행 하였다.본 연구는 헬스기구를 일반인, 비만인, 고령자 모두가 거부감 없이 사용 할 수 있는 디자인에 관한연구를 진행하고자하였다. 본 연구 이전에 진행된 사전 연구를 통해 비만집단, 고령자 그리고 일반인의 의미, 형태 그리고 신체의 긍정감과 거부감을 학인 한 이후 일반인, 고령자, 비만집단 각 50명 설문조사를 통해 헬스기구의 신체, 의미, 형태 긍정감과 거부감의 정도를 수집하고 거부감이 있는 헬스기구의 이유를 조사하였다. 연구의 결론은 일반인, 고령자, 비만집단의 특성을 모두 고려한 디자인은 일반인, 고령자, 비만집단의 헬스기구에 대한 거부감을 해결할 수 있는 재언을 제출한다. Along with the annually increasing problem of aging population, whereas the condition of physical nutrition has been enhanced due to the improvement of economic conditions, obesity group has risen as a social issue as a result of reduced activity level. Both of these two issues are health related, and every year a number of the elderly and obesity group are trying to keep their health through exercise. Many them are using fitness equipment to gain a healthy life, but it's hard to say that the design of this equipment is optimized for these users. The purpose of this study was to design a fitness equipment that has no negative influence on the use of fitness equipment as well as that the elderly and obesity group did not disapproval to it. The aim of this study is to investigate the kind of design that every general, elderly, and obesity group can use without any resistance. Found in study, figure, and the body‘s positive and negative reaction of every general, elderly, and obesity group of people through preceding research, by surveying 50 people, we have collected data on the degree of approval and disapproval reaction toward fitness equipment in terms of body, meaning, and figure, and investigated the reason why certain equipment received negative reaction. The conclusion of the study is that the design considering all the characteristics of the all general, the elderly and the obesity group propose solutions that can solve the disapproval of the all general, the elderly and the obesity group to the fitness equipment.