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信通:一个股份制的技术密集型企业  [PDF]
北京信通电脑技术公司
科技导报 , 1988,
Abstract: 北京信通电脑技术公司是由中科院计算技术研究所,中科院科学仪器厂和海淀区新型产业联合总公司三家各投资入股100万元,于1984年11月正式成立的股份有限公司,致力于电脑、信息技术等新技术的开发、推广和应用。到1987年底,公司从业人员已发展到109人,其中高级技术人员12人,中、初级技术人员51人,大专以上文化程度占全体人员的58%。1985到1987年,三年来销售额平均以330%的速率递增。1987年销售额7700万元,利润额440万元,人均销售额80万元,人均利润额5.2万元,其中两项人均指标居中关村电子一条街首位。到目前为止,信通公司已在全国各地建立了18个分公司和部,其中包括一个中港合资企业(已领执照)和一个中美合资企业(待批),开发经营范围也由原来单一的电脑系统扩
川南气田集输气管线通球清管的实践  [PDF]
喻平仁,邹锡文
天然气工业 , 1991,
Abstract: ?通球清管是天然气集输管道组焊完成后必须进行的重要工艺程序,也是管道投入运行后进行生产管理所必须采取的重要工艺措施.它对提高集输管线的输气效率和延长其使用寿命有十分重要的意义,在有水气田的生产中尤其如此.管道施工时,常在管中遗留机械杂质,管道组焊试压后,管道中的残留水难以排尽,管道投入生产运行后,气井所产的凝析油、水以及其他污物也会随天然气流带入管道中,使管道流通截面局部缩小或堵塞,增大阻力,降低输气效率,故要通球清管.
CDMA2000 Past, Present and Future  [cached]
Saad Zaman Asif
Buletin Teknik Elektro dan Informatika , 2012,
Abstract: The article looked into the possible future of 3GPP2’s CDMA2000 1X and CDMA2000 1xEV-DO networks. The 3G CDMA2000 family of standards including EV-DO (Evolution Data Optimized) is in the daily use of more than 600 million customers across the globe. During the last few years the development efforts around CDMA2000 had been declined and its importance had been overshadowed by more advanced 3GPP LTE and IEEE WiMAX mobile broadband technologies. Due to these reasons, CDMA2000 operators are looking for alternative migration paths. The article investigated multiple facets for the future of CDMA2000 industry and these aspects were covered both from research and operational perspectives. The article first focused on the short term interoperability challenges to LTE and WiMAX and provided some antidotes for addressing these hurdles. The key challenges that were investigated include spectrum planning, authentication and security, end-to-end QoS (Quality of Service), voice enablement and data service continuity. The investigation revealed that a new QoS mapping mechanism between EV-DO and WiMAX similar to the one shown in the article is required for smooth operation. The analysis further indicated that CSFB (Circuit Switched Fallback) and SVLTE (Simultaneous Voice and LTE) were two techniques which could be used to support CS voice on an LTE/CDMA network; however they had different inter-radio access technology interworking requirements. In the following section performance aspects of both WiMAX and EV-DO were highlighted indicating a deep dip in throughput values once the users switches from WiMAX to EV-DO. The article concluded by discussing the future roadmap of CDMA2000 from 1X Advanced and DO Advanced perspectives. A performance comparison between 1X and 1X Advanced and EV-DO and DO Advanced was also presented.
袁枚与彭启丰、李奉翰集外书札十一通考释  [PDF]
赵厚均
图书馆杂志 , 2015,
Abstract: ?文章辑录袁枚文集未收录的致彭启丰与李奉翰的书札共十一通,并对其所涉及的人物和事件进行了考释。
结合Gabor纹理特征的局域化多通道水平集分割方法  [PDF]
张立和,朱莉莉,米晓莉
电子学报 , 2011,
Abstract: 本文提出了一种局域化多通道主动轮廓模型的图像分割算法.针对纹理特征比较明显的图像,通过Gabor滤波提取纹理特征,与图像灰度信息构成多通道.考虑到演化过程中曲线内部和外部特征属性不均匀,引入局域化思想,通过计算各像素在局部区域的最小能量得到图像分割结果.最后算法结合先验形状对有遮挡目标进行分割,并能得到理想结果.大量实验验证了该方法具有良好的分割性能,优于同类算法.
Interference Analysis of TD-SCDMA System and CDMA2000 System  [cached]
Hao Chen,Tong Yang,Jianfu Teng,Hong He
Journal of Networks , 2012, DOI: 10.4304/jnw.7.1.101-109
Abstract: —In this paper, the feasibility of co-channel coexistence of Time Division- Synchronous Code Division Multiple Access(TD-SCDMA)and Code Division Multiple Access 2000(CDMA2000)systems operating in a macro cell environment is investigated. The deterministic analysis and simulation method are used to evaluate the performance compromising of both systems. Based on a more efficient calculation scheme, a novel deterministic equation is proposed and used to provide a better interpretation of the relationship between aggressor and victim in the interference system. The evaluation and simulation results show consistency with the corresponding experiment results. Furthermore, the interference characteristics of Omni-antenna and smart antenna in TD-SCDMA and CDMA2000 are compared, providing an important guideline to reduce the interference of two systems.
医学期刊微信运营模式探讨  [PDF]
廖梓言?,石芸?,罗瑞?,徐川平?
中国科技期刊研究 , 2015, DOI: 10.11946/cjstp.201504010290
Abstract: [目的]探讨医学期刊的微信公众平台建设、运营方法,并寻找良性的盈利模式。[方法]基于医学期刊微信公众号调查情况,总结其运营方式和盈利手段,分析其优点与不足。[结果]从微信公众号运营前期准备、公众号内容选择和编排,以及营销手段(微信推广和医学期刊微信公众号可能盈利模式)等方面提出改进意见,为医学期刊利用微信公众平台来扩大期刊盈利空间和实现新的盈利增长提供具体措施。[结果]医学期刊应努力寻求适合本刊的微信公众平台运营方式。
FPGA design of a cdma2000 turbo decoder  [PDF]
Maribell Sacanamboy Franco,Fabio G. Guerrero
Computer Science , 2014,
Abstract: This paper presents the FPGA hardware design of a turbo decoder for the cdma2000 standard. The work includes a study and mathematical analysis of the turbo decoding process, based on the MAX-Log-MAP algorithm. Results of decoding for a packet size of two hundred fifty bits are presented, as well as an analysis of area versus performance, and the key variables for hardware design in turbo decoding.
Research of detecting moving targets based on CDMA2000
基于CDMA2000移动目标的探测方法研究

XU Hai-yan,TIAN Zeng-shan,SHEN Jian-guo,ZHOU Yong-sheng,LIU Yang,
徐海燕
,田增山,沈建国,周永胜,刘扬

重庆邮电大学学报(自然科学版) , 2008,
Abstract: A novel scheme of the palm equipment detection system based on CDMA2000 is proposed to overcome the defects of complexity, being easily affected by environment and bad adaption for the vehicle detection system. The function of each unit of palm detection system is introduced, and the principles and flow chart of the system is given. The realization plan for palm system is discussed, and the measures for its implementation are presented.
ATM网络中特殊的信令-元信令
张天晶,汪齐贤
计算机系统应用 , 1998,
Abstract: 本文介绍了ATM网络信令系统中的元信令,分析了元信令在ATM网络中的作用及元信令规程与N-IS-DN信令规程的对应关系,并将元信令的功能作了总结。
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