同时，由于人们对网络服务质量的要求(quality of service，qos)越来越高，在求组播树的过程中需要加入越来越多的限制条件，使得所求解的问题成为np完全问题。
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近年来，随着国民生活水平及消费能力的提高，居民对运输行业服务质量的要求越来越高。
In recent years, with the increase of national consumption capacity and living standards, passengers 'requirements to transportation service have also improved.
为了解决好计算机网络中的多媒体通信以及对服务质量的要求，提出了一种基于优先级队列的缓存管理机制。
To meet the need of multimedia communications in network in desirable quality of service, a priority queue based on buffer management mechanism is forwarded in support of multimedia communications.
IPTV作为一种电信级业务，其亮点应用在于它的交互性和实时性，因此IPTV对服务质量的要求是非常苛刻的。
Thehighlightedapplicationof IPTV as a carrier-grade service lies in its being interactive and real-time. Therefore, the requirement of IPTV for service quality is extremely exacting.
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