Cognitive radio is being widely discussed,and resource allocation scheme is drawing a lot of attention.Although the existed resource allocation strategies have successfully enhanced spectrum efficiency,some critical c...Cognitive radio is being widely discussed,and resource allocation scheme is drawing a lot of attention.Although the existed resource allocation strategies have successfully enhanced spectrum efficiency,some critical challenges still remain unanswered such as the jointly consideration of the efficiency and fairness,the rational description of the spectrum resources,and the execution mode of the spectrum allocation.This paper presents a system level dynamic frequency spectrum allocation scheme based on a central heterogeneous network architecture,evaluates the matching degree of the spectrum demand and the available spectrum resources with corresponding matrices,jointly considers the efficiency and fairness of different cognitive radio systems.Simulation results and the application scenario are also presented and analyzed.展开更多
Effective assessment is inseparable from good teaching and learning. Just as a good tutor would practice different techniques of teaching, an assessor would usually use different strategies of assessment. Moreover, th...Effective assessment is inseparable from good teaching and learning. Just as a good tutor would practice different techniques of teaching, an assessor would usually use different strategies of assessment. Moreover, the different activities of assessment, such as teaching, are additionally executed at various times during the semester, thus, we can know in which way the student is learning. An assessment strategy lays out a well thoroughly considered choice of assessment methods that are aligned with the aims and learning outcomes. Because align the assessment with a specific kind of learning outcome, the tutor needs to choose a suitable technique of assessment. This paper draws upon a case study of the first year architectural design at Pharos University as another way to deal with realizing ＂how to design your assessment plan＂. Throughout the form of criteria based assessment, assessment can help to review the students and instructors feeling and reactions. Finally, we can learn to assist towards enhancing student learning through assessment. So, we can attract the consideration regarding the advantages of reviewing current assessment practices, and of accepting different ways to deal with assessment methods, in this manner profiting together student and tutor.展开更多
文摘Cognitive radio is being widely discussed,and resource allocation scheme is drawing a lot of attention.Although the existed resource allocation strategies have successfully enhanced spectrum efficiency,some critical challenges still remain unanswered such as the jointly consideration of the efficiency and fairness,the rational description of the spectrum resources,and the execution mode of the spectrum allocation.This paper presents a system level dynamic frequency spectrum allocation scheme based on a central heterogeneous network architecture,evaluates the matching degree of the spectrum demand and the available spectrum resources with corresponding matrices,jointly considers the efficiency and fairness of different cognitive radio systems.Simulation results and the application scenario are also presented and analyzed.
文摘Effective assessment is inseparable from good teaching and learning. Just as a good tutor would practice different techniques of teaching, an assessor would usually use different strategies of assessment. Moreover, the different activities of assessment, such as teaching, are additionally executed at various times during the semester, thus, we can know in which way the student is learning. An assessment strategy lays out a well thoroughly considered choice of assessment methods that are aligned with the aims and learning outcomes. Because align the assessment with a specific kind of learning outcome, the tutor needs to choose a suitable technique of assessment. This paper draws upon a case study of the first year architectural design at Pharos University as another way to deal with realizing ＂how to design your assessment plan＂. Throughout the form of criteria based assessment, assessment can help to review the students and instructors feeling and reactions. Finally, we can learn to assist towards enhancing student learning through assessment. So, we can attract the consideration regarding the advantages of reviewing current assessment practices, and of accepting different ways to deal with assessment methods, in this manner profiting together student and tutor.
