Bring in the Culture to the Science Classroom ; Bring in the Science Classroom to the Culture

Middle school science has a stigma of being a boring subject area from the student’s perspectives due to the spoon-fed characteristics and the lack of real-world connections in the curriculum design. The low-level student engagement and motivation in the science classroom often contribute to students’ low academic achievement, especially those who have been underserved in the educational system. In addition, with a view to addressing the increasing diversity in the classroom, teachers are encouraged to practice culturally relevant pedagogy (CRP) in the lessons so they can reach every student and make the class learning experience more meaningful and relevant to their cultural identities. This thesis aimed to document how I designed and carried out a diversity and inquiry focused science curriculum unit that sought to address the two issues and reflect on the implementation of the unit plan and the student learning outcome; discussed the limitations of the project; and indicated areas of growth for improvements. Results of this project suggested positive growth in academic achievement, cultural competence, student engagement, as well as a positive perspective change on science

Combining Spot and Futures Markets: A Hybrid Market Approach to Dynamic Spectrum Access

Dynamic spectrum access is a new paradigm of secondary spectrum utilization and sharing. It allows unlicensed secondary users (SUs) to exploit opportunistically the under-utilized licensed spectrum. Market mechanism is a widely-used promising means to regulate the consuming behaviours of users and, hence, achieves the efficient allocation and consumption of limited resources. In this paper, we propose and study a hybrid secondary spectrum market consisting of both the futures market and the spot market, in which SUs (buyers) purchase under-utilized licensed spectrum from a spectrum regulator, either through predefined contracts via the futures market, or through spot transactions via the spot market. We focus on the optimal spectrum allocation among SUs in an exogenous hybrid market that maximizes the secondary spectrum utilization efficiency. The problem is challenging due to the stochasticity and asymmetry of network information. To solve this problem, we first derive an off-line optimal allocation policy that maximizes the ex-ante expected spectrum utilization efficiency based on the stochastic distribution of network information. We then propose an on-line VickreyCClarkeCGroves (VCG) auction that determines the real-time allocation and pricing of every spectrum based on the realized network information and the pre-derived off-line policy. We further show that with the spatial frequency reuse, the proposed VCG auction is NP-hard; hence, it is not suitable for on-line implementation, especially in a large-scale market. To this end, we propose a heuristics approach based on an on-line VCG-like mechanism with polynomial-time complexity, and further characterize the corresponding performance loss bound analytically. We finally provide extensive numerical results to evaluate the performance of the proposed solutions.Comment: This manuscript is the complete technical report for the journal version published in INFORMS Operations Researc