语码转换的分类及存在原因

在日常生活中经常会有这样一类现象，运用社会语言学的术语来定义就是语码转换，即精通双语或多语的人们根据不同交际场合的需要进行不同语言的转换。同时这个概念也延伸到不同方言的转换。本不仅阐明了语码转换这个概念的定义，还将语码转换进行了详细的分类，最后提出了语码转换这个现象存在的原因。     

The Reflection of Cultural Differences in a Joint Performance

Cultureisoneofthemostdifficulttermstobewelldefined.NewWebstersDictionarysaysitisnotonly"theacquiredabilityofanindividualorapeopletorecognizeandappreciategenerallyacceptedestheticandintellectualachievementofcivilizationoraparticularstageorstagesofcivilizationasinthecaseofacertainnationorperiod"butalso"thetotalofhumanbehaviorpatternsandtechnologycommunicatedfromgene-rationtogeneration".Thelatterisananthropologicalandsociologicaldefinition,whichagreeswithLongmanModernEnglishDictionary'sthirddef…     

A Random Multi-Access Method for Data Services in CDMA Cellular System

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High-School Students' Attitudes Regarding Procedural Abstraction

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).     

《水浒》：被误读的文本？

《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。     

C源代码的安全检查技术研究

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．     

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

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.     

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

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

基于锁定的顾客网络管理策略

锁定是顾客转换品牌时面临着高转移成本的一种状态，它具有多种来源，并广泛存在于各种市场中。理解锁定的基本原理可以帮助企业建立基于锁定的顾客网络，从而获取竞争优势。企业在利用锁定原理建立顾客网络时，需要预先规划锁定周期，评估网络的投入成本和收益，采取各种策略吸引顾客入网；在运作顾客网络的过程中，企业要通过强化单个顾客和顾客网络整体的锁定程度以增加顾客网络的稳固性；对于顾客网络价值的开发，企业可以通过增量销售、互补产品销售和出售顾客网络接入机会等策略。     

媒体融合背景下科技期刊上码内涵及策略

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。