List of Articles Scalability

• Open Access Article
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  1 - A survey on Design and implementation of event-driven concurrent systems
  fuaud malekzadeh
  Due to the increase in the computational power of computers and the number of servers on the Internet, such as web servers, a problem called C10K emerged. The problem considers to actually handling10000 clients simultaneously through a Gigabit Ethernet pipe. For solving More

  Due to the increase in the computational power of computers and the number of servers on the Internet, such as web servers, a problem called C10K emerged. The problem considers to actually handling10000 clients simultaneously through a Gigabit Ethernet pipe. For solving this problem, some non/blocking methods were proposed. We are going to investigate and compare these methods in highly concurrent workloads. One of the most important reasons for wasting the processing power is communication between computation units and using blocking model in the style of programming because if our programs operate in non-blocking mode they can perform other works until the I/O operation is complete. Threads are widely-used tools for concurrency, but huge resource consumption and some limitations such as scalability in many systems due to the threading model has made researchers to focus on new techniques for example, the integration between thread-based concurrency and event-driven concurrency that is results in constructing hybrid systems. The current seminar presents a number of architectures for handling massive concurrency and load, and makes comparison among them. Manuscript profile
• Open Access Article
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  2 - SPIHT-DCT hybrid method using Placement spatial scalability and Place - when encoding a video HDTV
  vahid Seirafian siamak talebi
  This paper provided a hybrid coding using spatial and spatial - temporal scalability terms, for coding video with high resolution. In the hybrid method, Intra and Inter video frames are encoded in two different ways. Intra frames are coded using SPIHT algorithm based on More

  This paper provided a hybrid coding using spatial and spatial - temporal scalability terms, for coding video with high resolution. In the hybrid method, Intra and Inter video frames are encoded in two different ways. Intra frames are coded using SPIHT algorithm based on wavelet transform and Inter frames are coded using conventional MPEG-2 standard, based on DCT transform. With using this procedure, video is sent through two or three layers. The transmitted data from layers provided the video with different resolution and quality. There for, the user can choose the appropriate services based on their needs. In the spatial scalability, the base layer and enhanced layer have the same coding structure. But in the spatial - temporal scale when the second-upgraded-layer, because it contains only Inter frame, just coded based on standard methods. Simulation results of various videos with high resolution show the image quality of the proposed method in comparison of scalability in multiple layers in MPEG-2 standards. Manuscript profile