This paper proposed a novel fast fractional pixel search algorithm based on polynomial model. With the analysis of distribution characteristics of motion compensation error surface inside tractional pixel searching wi...This paper proposed a novel fast fractional pixel search algorithm based on polynomial model. With the analysis of distribution characteristics of motion compensation error surface inside tractional pixel searching window, the matching error is fitted with parabola along horizontal and vertical direction respectively. The proposcd searching strategy needs to check only 6 points rather than 16 or 24 points, which are used in the l lierarchical Fractional Pel Search algorithm （HFPS） for 1/4-pel and 1/8-pel Motion Estimation （ME）. The experimental results show that the proposed algorithm shows very good capability in keeping the rate distortion performance while reduces computation load to a large extent compared with HFPS algorithm.展开更多
This paper introduces the complexity and particularity of tube-sphere intersection weld(J-groove weld) and establishes the mathematical model of tube-sphere intersection trajectory.Based on the characteristics of J-gr...This paper introduces the complexity and particularity of tube-sphere intersection weld(J-groove weld) and establishes the mathematical model of tube-sphere intersection trajectory.Based on the characteristics of J-groove welds,the computational process of welding gun orientation is first simplified.Then the kinematic algorithm of a welding robot is obtained according to screw theory and exponential product formula.Finally,Solidworks and SimMechanics are employed to simulate the kinematics of the welding robot,which proves the feasibility of the kinematic algorithm.展开更多
Both empirical research findings and teaching experiences show that most non-English major undergraduates who are poorly aware of the cognitive psychological aspect of listening usually pay far greater attention to th...Both empirical research findings and teaching experiences show that most non-English major undergraduates who are poorly aware of the cognitive psychological aspect of listening usually pay far greater attention to their improvement of pronunciation, vocabulary, grammar, etc. only in listening class. That might be part of the reason, and the author will discuss the application of information-processing model theory, schema theory in particular from the angle of cognitive psychology in listening comprehension course, hoping to remove barriers in the listening procedure to achieve better progress for students in listening ability.展开更多
Social media are used in corporate communication more and more actively. Operating in conditions of the attention economy companies are fighting for the audience attention and that＇s why social media become valuable ...Social media are used in corporate communication more and more actively. Operating in conditions of the attention economy companies are fighting for the audience attention and that＇s why social media become valuable for them. However, the popular corporate communication theories and models were created at the time, when social media did not exist and could not fully reflect the special nature of the communication that is typical for the social media environment. This generates the need for a new corporate communication model. As a result of analysing the habits employed by users and br^mds in social media, as well as the existing models of corporate communication, the author proposes an ＂added value model＂, which illustrates the process of corporate communication in social media. According to this model, the process of corporate communication in social media is ongoing taking into account both the company＇s and users＇ goals, selecting particular social media on the basis of their message and enriching communication with a communicative added value. The element of added value indicates that social media have a potential to become not only a communication channel, but also a platform, which provides a limited or full range of services, service support, and satisfies users＇ needs. Thus, the proposed model could serve as a point of reference and evaluation, which is crucial for starting or improving corporate communication in social media.展开更多
An analytical model for the subthreshold current of a strained-Si metal-oxide-semiconductor field-effect transistor (MOSFET) is developed by solving the two-dimensional (2D) Poisson equation and the conventional drift...An analytical model for the subthreshold current of a strained-Si metal-oxide-semiconductor field-effect transistor (MOSFET) is developed by solving the two-dimensional (2D) Poisson equation and the conventional drift-diffusion theory. Model verification is carried out using the 2D device simulator ISE. Good agreement is obtained between the model's calculations and the simulated results. By analyzing the model, the dependence of current on the strained-Si layer strain, doping concentration, source/drain junction depths and substrate voltage is studied. This subthreshold current model provides valuable information for strained-Si MOSFET design.展开更多
基金Supported by the Doctoral Foundation of Ministry of Education of China (No.20040699015).
文摘This paper proposed a novel fast fractional pixel search algorithm based on polynomial model. With the analysis of distribution characteristics of motion compensation error surface inside tractional pixel searching window, the matching error is fitted with parabola along horizontal and vertical direction respectively. The proposcd searching strategy needs to check only 6 points rather than 16 or 24 points, which are used in the l lierarchical Fractional Pel Search algorithm （HFPS） for 1/4-pel and 1/8-pel Motion Estimation （ME）. The experimental results show that the proposed algorithm shows very good capability in keeping the rate distortion performance while reduces computation load to a large extent compared with HFPS algorithm.
基金Supported by National Natural Science Foundation of China (No. 50975195)Tianjin Research Program of Application Foundation and Advanced Technology (No. 10JCYBJC06500)
文摘This paper introduces the complexity and particularity of tube-sphere intersection weld(J-groove weld) and establishes the mathematical model of tube-sphere intersection trajectory.Based on the characteristics of J-groove welds,the computational process of welding gun orientation is first simplified.Then the kinematic algorithm of a welding robot is obtained according to screw theory and exponential product formula.Finally,Solidworks and SimMechanics are employed to simulate the kinematics of the welding robot,which proves the feasibility of the kinematic algorithm.
文摘Both empirical research findings and teaching experiences show that most non-English major undergraduates who are poorly aware of the cognitive psychological aspect of listening usually pay far greater attention to their improvement of pronunciation, vocabulary, grammar, etc. only in listening class. That might be part of the reason, and the author will discuss the application of information-processing model theory, schema theory in particular from the angle of cognitive psychology in listening comprehension course, hoping to remove barriers in the listening procedure to achieve better progress for students in listening ability.
文摘Social media are used in corporate communication more and more actively. Operating in conditions of the attention economy companies are fighting for the audience attention and that＇s why social media become valuable for them. However, the popular corporate communication theories and models were created at the time, when social media did not exist and could not fully reflect the special nature of the communication that is typical for the social media environment. This generates the need for a new corporate communication model. As a result of analysing the habits employed by users and br^mds in social media, as well as the existing models of corporate communication, the author proposes an ＂added value model＂, which illustrates the process of corporate communication in social media. According to this model, the process of corporate communication in social media is ongoing taking into account both the company＇s and users＇ goals, selecting particular social media on the basis of their message and enriching communication with a communicative added value. The element of added value indicates that social media have a potential to become not only a communication channel, but also a platform, which provides a limited or full range of services, service support, and satisfies users＇ needs. Thus, the proposed model could serve as a point of reference and evaluation, which is crucial for starting or improving corporate communication in social media.
基金supported by the National Ministries and Commissions (Grant Nos.51308040203 and 6139801)the Fundamental Research Funds for the Central Universities (Grant Nos.72105499 and 72104089)the Natural Science Basic Research Plan in Shaanxi Province of China (Grant No.2010JQ8008)
文摘An analytical model for the subthreshold current of a strained-Si metal-oxide-semiconductor field-effect transistor (MOSFET) is developed by solving the two-dimensional (2D) Poisson equation and the conventional drift-diffusion theory. Model verification is carried out using the 2D device simulator ISE. Good agreement is obtained between the model's calculations and the simulated results. By analyzing the model, the dependence of current on the strained-Si layer strain, doping concentration, source/drain junction depths and substrate voltage is studied. This subthreshold current model provides valuable information for strained-Si MOSFET design.
