Smart TV System will lead to drastic change of communication and media industries as one of the emerging next generation network services. However, when the number of concurrent users increases rapidly, the issue of service quality degradation occurs because providing services to many users simultaneously stresses both the server and the network. The server limitation can be circumvented by deploying server clusters. but the network limitation is far less easy to cope with, due to the difficulty in determining the cause and location of congestion and in provisioning extra resources. In order to alleviate these problems, a number of schemes have been developed. Prior works mostly focus on reducing user-centric performance metrics of individual connection, such as the round-trip time(RTT), downloading time or packet loss rate, but tend to ignore the network loads caused by the concurrent connections or global network load balance. In this work, we make an in-depth investigation on the issue of user grouping for massive Smart TV services through simulations on actual Internet test-bed, PlanetLab. 인프라-기반 콘텐츠 배급 네트워크(infrastructure-based content distribution networks) (CDN) (e.g., Akamai
Sudden cardiac arrest during epidural anesthesia is a rare but catastrophic complication. It was recently reported that occurs in one per 10,000 epidural anesthesia cases. We report one case of cardiac arrest in a healthy 45-year-old male patient undergoing relatively minor surgery. His preoperative blood pressure was 110-130/70-80 mmHg, heart rate 75-80 beats per minute, and oxygen saturation 98%. Immediately after tourniquet release, cardiac arrest was developed without warning signs. The patient was resuscitated by prompt precordial thump pacing, a fluid bolus, intravenous injection of atropine and ephedrine, and ventilated with oxygen. The procedure was completed and the patient recovered uneventfully.
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