Development of a diagnostic system using a testing-based approach for strengthening student prior knowledge

Students learn new instructions well by building on relevant prior knowledge, as it affects how instructors and students interact with the learning materials. Moreover, studies have found that good prior knowledge can enable students to attain better learning motivation, comprehension, and performance. This suggests it is important to assist students in obtaining the relevant prior knowledge, as this can enable them to engage meaningfully with the learning materials. Tests are often used to help instructors assess students’ prior knowledge. Nevertheless, conventional testing approaches usually assign only a score to each student, and this may mean that students are unable to realize their own individual weaknesses. To address this problem, instructors can diagnose the test results to provide more detailed information to each student, but this is obviously a time-consuming process. Therefore, this study proposes a testing-based diagnosis system to assist instructors and students in diagnosing and strengthening prior knowledge before new instruction is undertaken. Furthermore, an experiment was conducted to evaluate the effectiveness of the proposed approach in an interdisciplinary course, since several studies have indicated that students learn more and better in such courses when applying relevant prior knowledge to what they are learning. The experimental results show that the developed system is able to effectively diagnose students’ prior knowledge and enhance their learning motivation and performance on an interdisciplinary course. In addition, two diagnostic evaluations were also conducted to assess whether the diagnoses given by the system were consistent with the decisions of experts. The results demonstrate that the proposed system can effectively assist instructors and students in diagnosing and strengthening prior knowledge before new instruction is undertaken, since the diagnoses produced by the system were broadly consistent with those of experts.     

关于计算机类专科学生毕业设计阶段产学研模式的思考

计算机类专科学生毕业设计的传统教学模式，往往实践性不强，学生动手能力得不到较大提高。而产学研教学模式结合实际课题展开，既提高学生兴趣，又较大地提高了毕业设计的质量。同时这种产学研教学模式具有较强的开放性，应在学校的教学工作中配套完整的综合管理措施，才会真正达到好的效果。     

神华煤燃烧性能及其在火电机组"上大压小"中的作用

在总结神华煤及与其他动力煤配煤特性的基础上,重点分析神华煤与其他动力煤不同掺烧比条件下锅炉运行的经济性能、环保性能及其他性能,突出神华煤在火电机组"上大压小"中的重要作用。     

浅析技改项目的管理

为保证技术改造项目在计划编制、项目设计和项目实施方面的质量并顺利实施,实现技术改造目标,坚持项目计划来源于平时、项目设计从实际出发、项目实施服从于设计的原则,着重从项目储备申报、设计、实施等诸环节做好技术改造管理工作。     

安徽省长江基本建设项目验收程序分析

介绍了长江基本建设项目验收程序和方法,分析了验收中的遗留问题.     

Photovoltaic projects for decentralized power supply in India: A financial evaluation

The present study concentrates on photovoltaic (PV) projects for providing decentralized power supply in remote locations in India. Results of a techno-economic evaluation are presented. Some PV projects in the capacity range 1–110 kW_p, that have either been implemented or are under implementation, have been considered. An analysis of the capital cost of the PV projects and sub-systems has been undertaken. Levelized unit cost of electricity (LUCE) has been estimated for eighteen select locations situated in different geographical regions of the country. The LUCE is found to vary in the range of Rs. 28.31–59.16/kW h (US$ 0.65–1.35/k Wh) for PV projects in the capacity range 1–25 kW_p. In view of high unit cost of electricity from PV projects, need for financial incentives has been examined from the perspective of users. A sensitivity analysis has also been undertaken.     

三电平STATCOM不平衡条件下指令电流检测方法研究

本文针对三电平STATCOM在三相电网电压不平衡情况下,为了能够准确快速检测出负载电流的基波无功、负序以及谐波分量,提出了一种基于微分环节的改进指令电流检测方法,并对该检测方法在电网电压不平衡条件下的检测效果进行了仿真分析。     

三电平PWM整流器的SVPWM算法研究

本文提出了一种三电平PWM整流器的SVPWM算法。这种算法是将参考电压矢量转换到60°坐标系,然后再经过简单的算术运算即可计算出各基本矢量作用时间,避免了大量三角函数的运算。通过Matlab建立了三相三电平PWM整流器的电压定向控制系统的仿真模型,对该算法进行了仿真研究,结果验证了该算法的有效性。     

基于DEA算法的建设工程项目评标方法应用研究

提出了一种基于DEA算法的建设工程项目评标方法,采用DEA的C2R模型作为建设工程项目评价模型,并根据决策单元多输入多输出的特点建立了评价指标体系.实例分析表明,使用该模型可使评标方法和结果更科学、更公正.