High-School Students' Attitudes Regarding Procedural Abstraction   总被引：1，自引：0，他引：1  

Bruria Haberman 《Education and Information Technologies》2004,9(2):131-145

During the last decade a new computer science curriculum has been taught in Israeli high schools. This curriculum introduces CS concepts and problem-solving methods independently of specific computers and programming languages, along with the practical implementation of those concepts and methods encountered in actual programming languages. The advanced study unit of the curriculum, Software Design, introduces the students to various aspects of software systems design through the use of abstract data types (ADTs). One main goal of the unit is to develop abstract thinking skills and problem-solving abilities. More specifically, the unit presents principles such as procedural abstraction, data abstraction, information hiding, modularity, efficiency, and reuse of code.We present the results of a preliminary study whose aim was to assess students' attitudes regarding procedural abstraction. The research population consisted of high-school students who attended the Software Design course (beginners), and a control group of undergraduate CS students (advanced). The results of the study clearly indicated a significant difference between the attitudes of the two groups. We found that the advanced students preferred algorithms that were formulated to some extent with high-level abstraction; however, they encountered a cognitive barrier when dealing with algorithms that they had evaluated as too abstract for them. However, beginners felt more comfortable with algorithms with low-level abstraction. Nevertheless they showed open-mindedness toward some degree of procedural abstraction. The results of the study were used to design scaffolding problem-solving tools for algorithm development, utilizing procedural abstraction techniques that can be adapted to various student populations (Haberman, B. (2002) SIGCSE Bulletin, 34(4), 60–64).  相似文献   

《水浒》：被误读的文本？     

李友桥  余利 《湘潭师范学院学报(社会科学版)》2001,23(6):72-75

《水浒》所表现的主旨一直被人们误读，其实，在“官逼民反”、“替天行道”、“忠义双全”等旗号下，是吏胥、军官和地主等统治阶级的中下层集团纠合流民和市民势力发动的一次争取权力的斗争，对封建政权并没有形成真正的冲击，而“八方共域，异姓一家”也只是虚幻的表象。  相似文献   

C源代码的安全检查技术研究     

陈丹  洪莉 《襄樊学院学报》2006,27(2):57-59

通过分析C语言源代码中可能存在的安全问题,给出相应的C程序源代码的安全性检查策略,并探讨C程序源代码的安全检查技术及其可行性．  相似文献   

Header error control schemes for coping with upstream channel noise in the HFC network     

Chen Hui-fang  Xie Lei  Qiu Pei-liang 《浙江大学学报(A卷英文版)》2001,2(1):51-55

The Hybrid Fiber-Coax (HFC) network is being paid close attention to in recent years as a bi-directional broadband access network. To achieve seamless connection with the backbone network, and Asynchronous Transfer Mode (ATM) Network Network Interface (NNI) cell format is used as the basic transmission packet unit in the HFC system. As the transmission condition of the HFC system’s upstream channel is bad, two improved header error control (HEC) schemes, i. e. the improved HEC and the cell interleaving technique, are employed to guarantee the packet integrity. Theoretical analysis of the results showed that the improved HEC and the cell interleaving technique are applicable to isolated random errors and burst errors, respectively.  相似文献   

HEADER ERROR CONTROL SCHEMES FOR COPING WITH UPSTREAM CHANNEL NOISE IN THE HFC NETWORK     

陈惠芳  谢磊  仇佩亮 《Journal of Zhejiang University. Science. B》2001,(1)

ＩＮＴＲＯＤＵＣＴＩＯＮＡＴＭｈａｓｇｒｅａｔｓｕｐｅｒｉｏｒｉｔｙｉｎｃｅｒｔａｉｎａｓｐｅｃｔｓ,ｓｕｃｈａｓｒｅｓｏｕｒｃｅａｌｌｏｃａｔｉｏｎｆｌｅｘｉｂｉｌｉｔｙ ,ｑｕａｌｉｔｙｏｆｓｅｒｖｉｃｅｇｕａｒａｎｔｅｅｉｎｇ ,ｉｎｔｅｇｒａｔｅｄｔｒａｆｆｉｃｓｕｐｐｏｒｔ ｉｎｇ ,ｅｔｃ .ＡＴＭｈａｓｂｅｅｎａｄｏｐｔｅｄｂｙＩｎｔｅｒｎａｔｉｏｎ ａｌＴｅｌｅｃｏｍｍｕｎｉｃａｔｉｏｎＵｎｉｏｎ (ＩＴＵ)ａｓｔｈｅｅｘ ｃｈａｎｇｅａｎｄｍｕｌｔｉｐｌｅｘｉｎｇｔｅｃｈｎｉｑｕｅｓｏｆｔｈ…  相似文献   

媒体融合背景下科技期刊上码内涵及策略     

景勇  张扬  秦毅  钟媛  尹淑英 《编辑学报》2020,32(1):30-33

以科技期刊对码的使用为切入点,分析探索科技期刊在新型应用场景下的媒体融合实施路径,归纳总结科技期刊使用码的种类和特点,分析科技期刊使用码的本质、诉求和存在的问题。建议科技期刊可以采用深挖内容资源、与专题策划相结合、尝试增加科普内容、合理美观布局等措施实施基于二维码的融合出版。  相似文献   

科技期刊条码中年份码现状调查   总被引：3，自引：0，他引：3  

徐红星  徐云峰  祝贞学 《编辑学报》2007,19(4):281-281

1 条码中的年份码 条码是由一组按特定规则排列的宽窄不同的线条、空格及相应数据字符组成的符号,是一种信息代码.GB/T16827-1997《中国标准刊号(ISSN部分)条码》[1]已于1998年3月1日起实施.  相似文献   

The lamaze certified childbirth educator: standards of practice     

Lothian JA 《The Journal of perinatal education》2007,16(1):29-31

A student in a Lamaze Childbirth Educator Program expresses concern that some Lamaze Certified Childbirth Educators (LCCE educators) do not teach classes that reflect Lamaze standards. In this column, the ethical and professional standards of the LCCE educator and the challenges the childbirth educator experiences while practicing in the current maternity-care environment are presented and discussed. Lamaze International's Code of Ethics for Lamaze Certified Childbirth Educators provides guidance when dealing with these challenges.  相似文献   

论古代醉舞与醉拳     

高春明 《安阳工学院学报》2007,(4):102-104

运用文献资料法、专家访谈法、考古法等方法,对古代醉舞与醉拳进行重新考证,从中找出各自的文化特点,并找出两者紧密联系在一起的关键因素,从而得出建设性的结论,有利于人们对之进行正确地把握.  相似文献   

氧气公司钢瓶管理系统的设计与实现     

罗度军  杨宏亮  龙虹霞 《武汉工程职业技术学院学报》2011,23(1):43-46

根据氧气公司实际生产需求,构建了一个基于条形码的钢瓶综合管理系统。该管理信息系统具有检验信息管理、充装信息管理、质检信息管理、销售信息管理、报表查询统计信息管理功能等。该管理信息系统的应用,可以快捷地了解每个钢瓶的流程信息,避免过期、泄漏、伪劣的钢瓶再次被使用,保证每个钢瓶在健康安全的状态下进行工作,同时能准确确定钢瓶在厂内厂外流转的方位。实现了对钢瓶信息状况的计算机动态管理。  相似文献