Rapid growth of wireless communication services in recent decades has created a huge demand of radio spectrum. Spectrum scarcity and utilization inefficiency limit the development of wireless networks. Cognitive radio is a promising tech- nology that allows secondary users to reuse the underutilized licensed spectrum of primary users. The major challenge for spectrum sharing is to achieve high spectrum efficiency while making non-intrusive access to the licensed bands. This requires in- formation of availability and quality of channel resources at secondary transmitters, however, is difficult to be obtained perfectly in practice.
標簽： Opportunistic Spectrum Sharing
上傳時間： 2020-05-31
上傳用戶：shancjb
This is a practical book, to be sure, but it is also a book about hope and posi- tive change. I am quite sincere. The delivery of electricity is deeply rooted in the principle of universal access; when clean, reliable energy is available it contributes to poverty alleviation, improved social conditions, and enhanced economic development. In the developed world, we know this to be true. The digital fabric of our lives is a testimony to the importance of energy security. Across the globe, we have seen the vital contributions that electrification has brought to the development of economies and an enhanced quality of life. Nonetheless, this supreme engineering achievement has languished, and we are deeply challenged.
標簽： Strategies Analytics Data Big
上傳時間： 2020-06-07
上傳用戶：shancjb
Although doing science is at the heart of discovery, the effort would have very limited consequence in the long term without writingscience. As a social enterprise that depends on collaboration, scientific inquiry requires its practi- tioners to write on a regular basis. From time to time, some members of the scientific community have been critical of the overall quality of writing by re- searchers.
標簽： Goldbort_Writing Science for
上傳時間： 2020-06-09
上傳用戶：shancjb
In this book for the optimisation of assembly conveyor lines we are dealing with series part production featured by a medium complexity degree and a medium number of individual components and assembly technique alternatives. Modern production techniques for medium to large series products or mass production usually involve assembly conveyor lines. They still use hand labour more or less automated. The aim is to have monotonous and similar in type operations or such causing fatigue, stress and production traumas, gradually replaced by automated assembly cycles, means and techniques. This usually widely involves industrial robots and handlers. Higher productivity, lower cost and higher quality of assembled products are usually required.
上傳時間： 2020-06-10
上傳用戶：shancjb
本文首次設計并驗證了基于macom三合一芯片設計的光模塊電路,該電路旨在提供一種滿足SFF-8472中規定的數字診斷功能的低成本SFP+模塊。電路采用激光器驅動、限幅放大器、控制器以及時鐘恢復單元集成的單芯片,在保證高精度數字診斷功能基礎上,實現了低成本高可靠的特點。該電路在光接收接口組件與激光器驅動和限幅放大器單元的限幅放大器部分之間接入濾波器來提高模塊的靈敏度及信號質量。在控制器單元的數字電位器的引腳上采用外加電阻的方式避免出現上電不發光的故障問題。該研究結果為下一代SFP-DD光模塊設計與開發工作,奠定了一定的理論與實踐基礎。This paper designs and validates the optical module circuit based on the MACOM Trinity chip for the first time.This circuit aims to provide a low-cost SFP module which meets the digital diagnosis function specified in SFF-8472.The circuit uses a single chip integrated with laser driver,limiting amplifier,controller and clock recovery unit.On the basis of ensuring high precision digital diagnosis function,it achieves the characteristics of low cost and high reliability.The circuit connects a filter between the optical receiving interface module and the limiting amplifier part of the laser driver and limiting amplifier unit to improve the sensitivity and signal quality of the module.The pin of the digital potentiometer in the controller unit is equipped with an external resistance to avoid the problem of power failure.The research results lay a theoretical and practical foundation for optical module design in high-speed data center.
上傳時間： 2022-04-03
上傳用戶：
It provides a base of DICT web service ( similar to DICT rfc2229) and create relative applications (server side,client side), they are all SOAP based.
標簽： DICT applications provides relative
上傳時間： 2015-01-12
上傳用戶：alan-ee
It provides a base of DICT web service ( similar to DICT rfc2229) and create relative applications (server side,client side), they are all SOAP based.
標簽： DICT applications provides relative
上傳時間： 2015-01-12
上傳用戶：TF2015
ActiveTcl is ActiveState s quality-assured distribution of Tcl, available for AIX, HP-UX, Linux, Mac OS X, Solaris, and Windows
標簽： quality-assured distribution ActiveState ActiveTcl
上傳時間： 2015-04-15
上傳用戶：TF2015
Quality, object.oriented architecture is the product of careful study, decision making, and experimentation. At a minimum, the object.oriented architecture process includes farming of requirements, architecture mining, and hands.on experience. Ideally, object.oriented architecture comprises a set of high.quality design decisions that provide benefits throughout the life cycle of the system.
標簽： architecture decision oriented Quality
上傳時間： 2014-10-28
上傳用戶：love_stanford
Application & Integration Services are at the heart of any Service Oriented Architecture (SOA). Sun Java System Application Server and integration services provide a highly scalable and reliable platform for the standards-based deployment of Java applications and web services. Sun s offerings may be used by small organizations and large enterprises that require a services-based foundation to rapidly unlock the business value of their IT investment.
標簽： Architecture Application Integration Services
上傳時間： 2014-12-20
上傳用戶：lanwei
