multi-access mode 中文意思是什麼
multi-access mode
解釋
多址方式-
At the early age of embedded system history, many real - time operating system use multi - task sharing single address space mode, which means kernel and application run in the same priviledge and application can access the whose address space with full pomission, for the limited performance and hardware resource
在嵌入式系統發展早期，由於硬體資源和性能有限，很多實時操作系統採用的是單地址多任務空間模式，即內核和應用都運行在同一特權級，應用程序可以無限制的訪問整個系統地址空間。 -
This paper stresses on discussing the architecture, access protocol and implementation mechanism based on xml and web services technologies, researches key technologies of metadata information service and data uniform access and management in database grid, designs and implements distributed mis subsystem and das subsystem, which support multi - domain management. mis can provides metadata information for the whole system, such as das and clients, it uses domain name 、 logical name and internal name of data object to uniformly name database resources in grid and implements name mapping mechanism and user view metadata information service and provides virtual organization and management of database resources. das can provide a scalable uniform data access by virtual organization and management of storage resources and multi - mode data share access mechanism, thus integrate database resources in grid and shields distribution and heterogeneity of resources and achieves transparent access. system adopts data access mechanism based on user request mapping to flexibly implement data access across multi domains, and adopts distributed data cache mechanism 、 security mechanism based gsi to provide high - performance secure data service for grid users
本文論述了griddaen - dai系統的邏輯結構、訪問協議、數據服務流程以及基於webservices 、 xml等技術的實現策略，重點研究數據庫網格中的元服務、數據統一訪問和管理等關鍵技術，設計和實現了支持多管理域的分散式元服務子系統和數據訪問服務子系統。其中元服務主要為整個系統提供各種元信息支持，它採用域名、數據對象的邏輯名稱、物理名稱和內部名稱對廣域環境下的數據庫數據進行了統一命名，實現了相應的名字映射機制和全局的用戶數據視圖服務，提供了數據庫資源的虛擬組織與管理方式;數據訪問服務通過提供可擴展的統一數據訪問和支持多種數據共享訪問模式，屏蔽了數據庫資源的分佈性和異構性，為用戶提供了統一透明的數據服務。 -
Optical code division multiple access ( ocdma ) is a communication mode which introduces the code division multiple access ( cdma ) technology into optical fiber communication system. besides providing asynchronous communications access, ocdma system has many advantages, such as high capacity, security against interception, suppression of narrow band disturbances, capability in forming variable bit rate networks and multi - rate networks. it implies a great challenge for the development of future communication networks, especially all optical networks
光碼分多址（ ocdma ）是將碼分多址（ cdma ）技術與大容量的光纖通信技術相結合的一種通信方式，其主要優點表現在如下幾個方面：允許多個用戶隨機地接入同一通道：可構成真正「透明」的全光通信網路；具有良好的安全性；允許可變速率或多速率傳輸，並可同時提供多種業務支持；具有優良好的抗干擾能力，並能夠充分地利用石英光纖的可用帶寬。 -
G. shdsl dsu is a tdm mode, ram line code based cpe designed to be interoperable with the existing and future dslam or multi - service access system in the market
Shdsldsu是基於tdm模式和pam線路編碼的用戶端設備，可與市場上現有和將來的dslam或多服務接入系統互通。
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