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

ＡＲａｎｄｏｍＭｕｌｔｉＡｃｃｅｓｓＭｅｔｈｏｄｆｏｒＤａｔａＳｅｒｖｉｃｅｓｉｎＣＤＭＡＣｅｌｕｌａｒＳｙｓｔｅｍＬｉＺｈｅｎ（李振）ＹｏｕＸｉａｏｈｕ（尤肖虎）（ＮａｔｉｏｎａｌＭｏｂｉｌｅＣｏｍｍｕｎｉｃａｔｉｏｎｓＲｅｓｅａｒｃｈＬａｂｏｒ...     

我国不动产登记的公示、公信效力评价

本首先检讨了我国现行不动产登记制度公示、公信效力存在的制度缺陷，接着对不动产公示、公信力的制度建设提出了自己的立法建议，特别分析了废除产权证书发放的必要性、可行性，并提出以全新开放的计算机资讯服务代替产权证书的发放。     

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…     

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。     

注册报告制对科技期刊论文发表的变革性影响分析

学术发表偏差的存在使非阳性科学研究难以获得支持,并且滋生了论文数据造假的现象。注册报告制论文发表模式是一种新型的学术论文发表机制,它不注重于论文的研究结果,而是把重心更多地集中于研究开展的过程。本文分析注册报告制的背景与内涵,阐述注册报告制论文发表的全过程,分析该制度与传统学术论文发表制度的优劣势,并归纳注册报告制近年来的发展趋势,从而提出推动注册报告制在我国发展的建议。     

科技期刊条码中年份码现状调查

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.