Boosting question answering over knowledge graph with reward integration and policy evaluation under weak supervision     

《Information processing & management》2023,60(2):103242

Among existing knowledge graph based question answering (KGQA) methods, relation supervision methods require labeled intermediate relations for stepwise reasoning. To avoid this enormous cost of labeling on large-scale knowledge graphs, weak supervision methods, which use only the answer entity to evaluate rewards as supervision, have been introduced. However, lacking intermediate supervision raises the issue of sparse rewards, which may result in two types of incorrect reasoning path: (1) incorrectly reasoned relations, even when the final answer entity may be correct; (2) correctly reasoned relations in a wrong order, which leads to an incorrect answer entity. To address these issues, this paper considers the multi-hop KGQA task as a Markov decision process, and proposes a model based on Reward Integration and Policy Evaluation (RIPE). In this model, an integrated reward function is designed to evaluate the reasoning process by leveraging both terminal and instant rewards. The intermediate supervision for each single reasoning hop is constructed with regard to both the fitness of the taken action and the evaluation of the unreasoned information remained in the updated question embeddings. In addition, to lead the agent to the answer entity along the correct reasoning path, an evaluation network is designed to evaluate the taken action in each hop. Extensive ablation studies and comparative experiments are conducted on four KGQA benchmark datasets. The results demonstrate that the proposed model outperforms the state-of-the-art approaches in terms of answering accuracy.  相似文献   

Tennis superstars: The relationship between star status and demand for tickets     

《Sport Management Review》2020,23(2):330-347

Akin to other sports, professional tennis is urged to adopt a consumer-centred strategy and understand the influence of the star status of elite players on demand for its core product. Measuring the impact that tennis players have on demand for match attendance remains a key element towards achieving that goal. Using data from the Australian Open ticket sales, the authors demonstrate how individual players have influenced stadium attendance at the Grand Slam. Findings indicate that some players are associated with a strong positive impact on demand for tickets, above and beyond their performance ratings, reflecting their value to the Australian Open. The authors discuss how this star status can be used to inform business decisions related to tournament management, match scheduling, and determining player appearance fees, to ultimately drive better commercial outcomes and deliver a world-class sporting event. The findings have implications for tournament organisers, player managers and those that market player activities.  相似文献   

Science notebooks as interactional spaces in a multilingual classroom: Not just ideas on paper     

Sara E.D. Wilmes  Christina Siry 《科学教学研究杂志》2020,57(7):999-1027

Past studies have explored the role of student science notebooks in supporting students' developing science understandings. Yet scant research has investigated science notebook use with students who are learning science in a language they are working to master. To explore how student science notebook use is co-constructed in interaction among students and teachers, this study examined plurilingual students' interactions with open-ended science notebooks during an inquiry science unit on condensation and evaporation. Grounded in theoretical views of the notebook as a semiotic social space, multimodal interaction analysis facilitated examination of the ways students drew upon the space afforded by the notebook as they constructed explanations of their understandings. Cross-group comparison of three focal groups led to multiple assertions regarding the use of science notebooks with plurilingual students. First, the notebook supported student-determined paths of resemiotization as students employed multiple communicative resources to express science understandings. Second, notebooks provided spaces for students to draw upon diverse language resources and as a bridge in time across multiple inquiry sessions. Third, representations in notebooks were leveraged by both students and teachers to access and deepen conceptual conversations. Lastly, students' interactions over time revealed multiple epistemological orientations in students' use of the notebook space. These findings point to the benefits of open-ended science notebooks use with plurilingual students, and a consideration of the ways they are used in interaction in science instruction.  相似文献   

Towards truly inclusive science education: a case study of successful curriculum innovation in a special school     

Jane Essex 《Support for Learning》2020,35(4):542-558

The paper provides a first person account of participant evaluation research of curriculum innovation in a school serving students with profound learning difficulties. It describes how the aspirations of the school leadership team to introduce science, combined with advisory support, overcame the initial anxiety of teaching staff about teaching an unfamiliar subject. The staff position was transformed and they gave a very positive evaluation of their experiences of teaching science, due to the impact of the subject on their students. The introduction of a distinct and inclusive model of science into the curriculum was ultimately found to have significant benefits for both students and staff.  相似文献   

Actions for sociopolitical consciousness in a high school science class: A case study of ninth grade class with predominantly indigenous students     

Bhaskar Upadhyay  Erin Atwood  Baliram Tharu 《科学教学研究杂志》2020,57(7):1119-1147

This case study explores how a group of Grade 9 students engaged in sociopolitical discourses and actions in a science class in a mostly indigenous student school in Nepal. The study used sociopolitical consciousness (SPC) as a framework to document and understand indigenous students’ SPC-oriented science interactions and subsequent social change actions. We used ethnographic methods of data collection over 6 months. The study focused on the actions of 4 girls and 2 boys belonging to the indigenous Tharu group. Data were analyzed using iterative qualitative methods. The study findings show that students are capable of engaging in critical thinking, critical reflecting, and taking actions for social change. Additionally, students are competent to link their experiences with social, structural, and political discrimination to the relevant science content they learn. The study presents four thematic findings related to SPC and science teaching and learning: Fostering social justice awareness in science class, fostering structural understanding of inequities in sickle cell disease, fostering sociopolitical actions for sickle cell disease, and the teacher's activist pedagogy for SPC in science learning. Implications of the study are that culturally relevant pedagogy helps indigenous students to become sociopolitically more aware of the links between science and social change. Adding aspects of critical pedagogies in science teaching could encourage students to become more sociopolitically reflective about science learning.  相似文献   

Chinese university EFL teachers’ beliefs and practices of classroom writing assessment     

《Studies in Educational Evaluation》2020

This study investigates the extent to which university teachers’ beliefs about classroom writing assessment are congruent with their self-perceived practices in English-as-a-foreign-language (EFL) contexts, and what factors contribute to belief-practice inconsistencies. Drawing on data from a survey of 136 Chinese university EFL writing teachers and ten teacher interviews, results showed a degree of belief-practice alignment regarding assessment for learning (AfL) practices that make learning explicit, but belief-practice discrepancies were more salient. AfL practices that empower students to take responsibility in writing assessment were perceived to be more important than assessment of learning practices; however, the reverse was found in teachers’ practice. Impacts of micro-level factors including assessment training, teaching experience, student attributes, meso-level school factors, and macro-level assessment culture are discussed, and implications are drawn.  相似文献   

Automated Scoring of Constructed‐Response Science Items: Prospects and Obstacles     

Ou Lydia Liu  Chris Brew  John Blackmore  Libby Gerard  Jacquie Madhok  Marcia C. Linn 《Educational Measurement》2014,33(2):19-28

Content‐based automated scoring has been applied in a variety of science domains. However, many prior applications involved simplified scoring rubrics without considering rubrics representing multiple levels of understanding. This study tested a concept‐based scoring tool for content‐based scoring, c‐rater?, for four science items with rubrics aiming to differentiate among multiple levels of understanding. The items showed moderate to good agreement with human scores. The findings suggest that automated scoring has the potential to score constructed‐response items with complex scoring rubrics, but in its current design cannot replace human raters. This article discusses sources of disagreement and factors that could potentially improve the accuracy of concept‐based automated scoring.  相似文献   

Readiness for school of children having attended language immersion kindergarten in their teachers' and parents' opinions     

Airi Kukk  Aino Ugaste 《International Journal of Early Years Education》2014,22(2):156-168

In multicultural societies, much attention is given to children's language learning possibilities. In Estonia, the early language immersion programme for kindergarten children was started in the year 2000. The programme, while considered to be successful, has raised the question of whether the children participating in it are adequately prepared for school. The objective of the present study is to observe the readiness for school of those children who have participated in the early language immersion programme, taking into consideration the objectives of the curriculum and their teachers' and parents' assessments. The method of this study was a questionnaire employed over a three-year period (2009–2011) involving the teachers and parents of those children who were beginning their primary school education. The results of the study revealed that, according to the assessments of their teachers and parents, the readiness for school of the children having completed the early language immersion programme was very good. Data prove that language immersion programmes provide children with enough preparation to make a smooth transition from kindergarten to school life.  相似文献   

维柯《新科学》的三个关键词     

冀志强 《唐山学院学报》2014,(5):25-27

在维柯的《新科学》中有三个关键词可以视为他所建立的这门新科学的理论支柱。这三个关键词是天神意旨、心头词典和诗性智慧。天神意旨是其新科学的理论背景,心头词典是其新科学的历史工具,诗性智慧是其新科学的核心成果。通过这三个关键词,可以从整体上更为深入地认识维柯所建立的新科学的历史地位和学术价值。同时,将这三个关键词结合起来整体思考,也可发现这其中有某些通常被人们所忽视的维度。  相似文献   

Toward an Ethical Rhetoric of the Digital Scientific Image: Learning From the Era When Science Met Photoshop     

Jonathan Buehl 《Technical Communication Quarterly》2014,23(3):184-206

Over the past two decades, scientific editors have attempted to correct “mistaken” assumptions about scientific images and to curb unethical image-manipulation practices. Reactions to the advent and abuse of image-adjustment software (such as Adobe Photoshop) reveal the complex relations among visual representations, scientific credibility, and epistemic rhetoric. Perelman and Olbrechts-Tyteca's model of argumentation provides a flexible system for understanding these relations and for teaching students to use scientific images ethically and effectively.  相似文献