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We solve the problem of petroleum products distribution through oil pipelines networks. This problem is modelled and solved using two techniques: A heuristic method like a multiobjective evolutionary algorithm and Mathematical Programming. In the multiobjective evolutionary algorithm, several objective functions are defined to express the goals of the solutions as well as the preferences among them. Some constraints are included as hard objective functions and some are evaluated through a … 相似文献
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In this paper we investigate whether computer programming has an impact on high school student’s reasoning skills, problem solving and self-efficacy in Mathematics. The quasi-experimental design was adopted to implement the study. The sample of the research comprised 66 high school students separated into two groups, the experimental and the control group according to their educational orientation. The research findings indicate that there is a significant difference in the reasoning skills of students that participated in the “programming course” compared to students that did not. Moreover, the self-efficacy indicator of students that participated in the experimental group showed a significant difference from students in the control group. The results however, failed to support the hypothesis that computer programming significantly enhances student’s problem solving skills. 相似文献
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Gallego-Romero Jesús Manuel Alario-Hoyos Carlos Estévez-Ayres Iria Delgado Kloos Carlos 《Educational technology research and development : ETR & D》2020,68(5):2505-2528
Educational technology research and development - Massive Open Online Courses (MOOCs) can be enhanced with the so-called learning-by-doing, designing the courses in a way that the learners are... 相似文献
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Ann Neville Miller Evangeline Nalugya Charles Gabolya Sarah Lagot Richard Mulwanya Joseph Kiva 《Sex education》2016,16(6):707-720
Although mounting evidence in Western nations indicates that entertainment media influence young people’s sexual socialisation, virtually no research has addressed the topic in sub-Saharan Africa. The present study employed 14 focus groups of Ugandan high school students to identify media through which they were exposed to sexual content, how they interpreted and evaluated that content, and how they compared its influence with that of parents, schools and religious institutions. Participants most often mentioned TV, followed by print media and Internet as sources of sexual material. Media were said to present discrepant messages regarding the timing of sexual debut, with international programming urging early sexual debut and local programming described as urging young people to delay sex. Young people spoke of turning to ssengas and kojjas for sexual advice, and a number of boys suggested pornography could also be educational. Both local and international programming was interpreted as conveying views of men as sex driven and women as submissive in sex and relationships. Participants expressed the belief that sexual media content had a negative impact on young people. Most nevertheless assessed these messages as more influential than other sources of sexual socialisation. 相似文献
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INTRODUCTION We consider the following nonlinear integerprogramming problem (PI) minf(x), s.t. x∈XI (1)where XI?In is a bounded and closed box set con-taining more than one point; In is the set of integerpoints in Rn. Notice that the formulation in (PI) allows the setXI to be defined by equality constraints as well asinequality constraints. Furthermore, when f(x) is co-ercive, i.e., f(x) → ∞ as ||x||→∞, there always exists abo… 相似文献
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A model of dynamic programming for repairing strategies of concrete structures during a projected service period is proposed,which takes into account the degradation in strength of components and the probability of accidental load.This model takes the safety grade of a structural system as the state variable of repairing strategies,and incorporates economic factors including expected repair cost,property loss due to structure failure,goods and material loss due to structure failure,loss of production interrupt due to structure failure,and inspection cost in decision making.It is found that the optimal repairing strategies are sensitive to the probability of accidental loads as well as the failure costs.The practicality of the model is demonstrated by an example. 相似文献
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WANG Wei-xiang SHANG You-lin ZHANG Lian-sheng 《浙江大学学报(A卷英文版)》2006,7(12):2083-2087
INTRODUCTION Considering the following nonlinear integer programming problem: (PI) min f(x), s.t. x∈XI, (1) where XI?In is a bounded and closed box set con- taining more than one point, In is the set of integer points in n . If we suppose that f(x) satisfies the following conditions: if x∈XI, then f(x)=f(x), otherwise f(x)= ∞, then Problem PI is equal to the following nonlinear integer programming problem (UPI) min f(x), s.t. x∈In. (2) The formulation in PI allows the set XI t… 相似文献
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GAO Shu GUO Qing-ping 《浙江大学学报(A卷英文版)》2006,7(10):1669-1675
INTRODUCTION DSP-based parallel system is a kind of high- performance parallel computer which uses parallel accelerating boards based on SHARC DSP chip (Kuo and Gan, 2005) as plug-in boards and inserts them into the military reinforcing computer, military fault-tolerant computer, even the personal computer. The parallel accelerating board based on SHARC DSP is a high-performance parallel processing board-level product developed by the Wuhan Digital Engineering Institute and is su… 相似文献
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This study reports on gender differences in an introductory programming (IP) course that uses a new teaching and learning approach based on the ADRI (Approach, Deployment, Result, Improvement) model. The teaching materials of the IP course were redesigned based on the new approach. The grades of the final exam were compared to determine the impact of the new teaching and learning approach on genders. A survey was conducted to collect students’ feedback. The responses of the survey were compared for each question among genders and T-test and Mann-Whitney U test were used to analyse the data. The results show that female students performed better in the high achiever category and male students performed better in the medium and low achiever categories in the final exam. The survey responses indicated that male students were more satisfied than female students with the new teaching and learning approach. The four stages of the ADRI approach support students’ cognitive gains and engagement. The students’ retention was higher which supports students’ affective engagement in the IP course. Overall, both the female and male students appreciate the ADRI approach in the IP course. 相似文献
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Mirjana Ivanović Stelios Xinogalos Tomáš Pitner Miloš Savić 《Education and Information Technologies》2017,22(6):2981-3003
Technology enhanced learning (TEL) is increasingly influencing university education, mainly in overcoming disadvantages of direct instruction teaching approaches, and encouraging creativity, problem solving and critical thinking in student-centered, interactive learning environments. In this paper, experiences from object-oriented programming (OOP) courses that are taught in three institutions from three different European countries are presented and compared. The courses are based on Java and are delivered in the second year of studies, after students have attended an introductory programming course. The emphasis is given on TEL approaches and accompanying tools and services, focusing mainly on Learning Management Systems (LMS). Our students completed an appropriate questionnaire to evaluate the importance and utilization of TEL services that are used or planned to be used at the programming courses. The results of statistical analysis of collected data show that students from all three institutional groups consider organizational services provided by TEL tools as much or very much important in their education, while communicational services are rarely used. Using non-parametric statistical tests we studied the similarities and differences in perceived importance of TEL services among students from different institutional groups. 相似文献
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GAO Pei-wang CAI Ying 《重庆大学学报(英文版)》2006,5(3):170-174
1 Introduction ? Since the cutting plane method [1] and branch-and- bound principle [2] were developed as two types of efficient approaches for integer linear programming problems, how to improve them or to find new algorithms more efficient has become an… 相似文献
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J. Elizabeth Casey Puneet Gill Lisa Pennington Selina V. Mireles 《Education and Information Technologies》2018,23(4):1531-1546
Teaching programming and coding skills in K-12 classrooms is becoming a part of science, technology, engineering, and math (STEM) programs across the United States. Often, these opportunities are available through extra-curricular activities such as Robotics club, math club, STEM club, etc. Increasing STEM opportunities for students who are English language learners, culturally and linguistically diverse learners, and/or students from underserved backgrounds is vital. In a pilot study prior to a larger, grant-funded study on the effects of metacognitive strategy instruction on elementary students’ academic performance, the principal investigator (PI) developed an activity with a corresponding assessment instrument. The PI initially incorporated floor-robots into an activity in two fifth grade science classrooms. Pre/post survey analysis provided encouraging results. To follow up on the initial results, the PI and co-principal investigators (co-PIs) introduced floor-robots into eight additional fourth and fifth grade science classrooms over an additional school year, as well as in an after-school setting, to determine how floor-robots might be used effectively to engage elementary students in STEM learning. The investigators introduced over 257 elementary students to three types of floor-robots, and this provided students with opportunities to have hands-on access to programming and coding robots for specific purposes. Of the 257 students who interacted with the floor-robots, approximately 103 were provided with pre/post surveys on Roamer®, one of the floor-robots. Additional data analysis provided surprising and encouraging results. 相似文献
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David C. Johnson 《Education and Information Technologies》2000,5(3):201-214
The contribution of programming in the learning of school mathematics has been demonstrated in numerous project and research settings. However, it would appear that this activity has failed to permeate the system on any large and systemic scale.I suggest here that one reason for the current situation is that the exciting developments have not themselves been a required component embedded in a major curriculum theme. Further, the position that the programming environments themselves, e.g., Logo microworlds, would become the school mathematics curriculum has clearly failed to gain the support of the educational system. However, discrete mathematics and algorithmics, a strand within discrete mathematics, provides a natural home for programming. This in turn supports the use of a programming language in mathematical contexts for which pupil designed algorithms can be used to explore concepts and relationships. 相似文献
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Quadratic 0-1 problems with linear inequality constraints are briefly considered in this paper.Global optimality conditions for these problems,including a necessary condition and some sufficient conditions,are presented.The necessary condition is expressed without dual variables.The relations between the global optimal solutions of nonconvex quadratic 0-1 problems and the associated relaxed convex problems are also studied. 相似文献
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Recent studies in learning programming have largely focused on high school and college students; less is known about how young children learn to program. From video data of 20 students using a graphical programming interface, we identified ideas that were shared and evolved through an elementary school classroom. In mapping these ideas and their resulting changes in programs and outputs, we were able to identify the contextual features which contributed to how ideas moved through the classroom as students learned. We suggest this process of idea mapping in visual programming environments as a viable method for understanding collaborative, constructivist learning as well as a context under which experiences can be developed to improve student learning. 相似文献
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《Journal of moral education》2012,41(1):89-104
This study extends the examination of moral content in the media by exploring moral messages in television programming and viewer characteristics predictive of the ability to perceive such messages. Generalisability analyses confirmed the reliability of the Media’s Moral Messages (MMM) rating form for analysing programme content and the existence of 10 moral themes prevalent in television media. Standard regression analyses yielded evidence indicating viewers’ moral expertise, as measured by the Defining Issues Test (DIT), familiarity with the programme and level of education predicted their ability to perceive moral messages in a television drama popular in the USA at the time of data collection. Identification of patterns in moral content represented in television programming, as well as knowledge of how viewer characteristics relate to their ability to perceive such content, can provide parents and educators with a means for better comprehending messages regarding human interaction to which they or their children are exposed. 相似文献