The Experts below are selected from a list of 2913 Experts worldwide ranked by ideXlab platform

Eleftherios Zacharias - One of the best experts on this subject based on the ideXlab platform.

  • entry order and pricing over the product cycle the transition from the 486 to the Pentium Processor
    International Journal of Industrial Organization, 2006
    Co-Authors: George Deltas, Eleftherios Zacharias
    Abstract:

    Abstract Using a high frequency data set of advertized prices of personal computers we find that prices of Pentium computers of late entrants into this market segment are higher than the contemporaneous prices of their competitors. This is true even among firms which have the same price premium for their 486 computers, but is more pronounced for high quality firms. Over time, the difference in the Pentium computer prices between the early and late entrants declines to the level of the price gap for their 486 computers. In contrast, the entry prices of the late entrants are lower than the entry prices of the early entrants. These results suggest that entry prices of firms are set to extract short run rents from consumers who have a higher willingness to pay for their brand. They also suggest a rapidly declining price premium for quality over the product cycle. We develop a stylized two-period durable goods duopoly model that formalizes this intuition and which produces results consistent with these empirical regularities. In light of these findings, brand coefficients in hedonic regressions using high frequency data should not be interpreted as capturing unobserved quality only.

  • pricing over the product cycle the transition from the 486 to the Pentium Processor
    Social Science Research Network, 1999
    Co-Authors: George Deltas, Eleftherios Zacharias
    Abstract:

    Using a high frequency data-set of advertised prices in the personal computer industry, we find that firms which introduced Pentium computers late in the "buy Direct" segment of the market command a higher price premium compared to early entrants. This is true even among firms which have the same price premium for their 486 computers, but is more pronounced for high quality firms. Over time, the difference in the Pentium price premia of the late versus the early entrants decline to levels of the difference in the corresponding 486 price premia. The decline in the relative Pentium price premia contributes to a decline in overall price dispersion, while price dispersion for 486 computers remains constant. These results suggest that late entrants reap short run rents from these consumers that are loyal enough to them to have waited until their entry in order to purchase. They also suggest a rapidly declining price premium for quality over the product cycle. In light of these findings, brand coefficients in hedonistic regressions using high frequency data should not be interpreted as capturing unobserved quality only.

K J R Liu - One of the best experts on this subject based on the ideXlab platform.

  • software optimization of video codecs on Pentium Processor with mmx technology
    EURASIP Journal on Advances in Signal Processing, 2001
    Co-Authors: Pohsiang Hsu, K J R Liu
    Abstract:

    A key enabling technology for the proliferation of multimedia PC's is the availability of fast video codecs, which are the basic building blocks of many new multimedia applications. Since most industrial video coding standards (e.g., MPEG1, MPEG2, H.261, H.263) only specify the decoder syntax, there are a lot of rooms for optimization in a practical implementation. When considering a specific hardware platform like the PC, the algorithmic optimization must be considered in tandem with the architecture of the PC. Specifically, an algorithm that is optimal in the sense of number of operations needed may not be the fastest implementation on the PC. This is because special instructions are available which can perform several operations at once under special circumstances. In this work, we describe a fast implementation of H.263 video encoder for the Pentium Processor with MMX technology. The described codec is adopted for video mail and video phone softwares used in IBM ThinkPad.

  • software optimization of h 263 video encoder on Pentium Processor with mmx technology
    International Conference on Multimedia and Expo, 2000
    Co-Authors: Pohsiang Hsu, K J R Liu
    Abstract:

    A key enabling technology for the proliferation of multimedia PCs is the availability of fast video codecs, which are the basic building blocks of many new multimedia applications. Since most industrial video coding standards (e.g., MPEG1, MPEG2, H.261, H.263, etc.) only specify the decoder syntax, there is a lot of room for optimization in a practical implementation. When considering a specific hardware platform like the PC, the algorithmic optimization must be considered in tandem with the architecture of the PC. Specifically, an algorithm that is optimal in the sense of number of operations needed may not be the fastest implementation on the PC. This is because special instructions are available which can perform several operations at once under special circumstances. In this work, we describe a fast implementation of the H.263 video encoder for the Pentium Processor with MMX technology.

Michael D. Smith - One of the best experts on this subject based on the ideXlab platform.

  • the measured performance of personal computer operating systems
    Symposium on Operating Systems Principles, 1995
    Co-Authors: J. Bradley Chen, Kee Chan, David Mazières, Margo Seltzer, Yasuhiro Endo, Antonio Dias, Michael D. Smith
    Abstract:

    This paper presents a comparative study of the performance of three operating systems that run on the personal computer architecture derived from the IBM-PC. The operating systems, Windows for Workgroups, Windows NT, and NetBSD (a freely available variant of the UNIX operating system), cover a broad range of system functionality and user requirements, from a single address space model to full protection with preemptive multi-tasking. Our measurements were enabled by hardware counters in Intel's Pentium Processor that permit measurement of a broad range of Processor events including instruction counts and on-chip cache miss counts. We used both microbenchmarks, which expose specific differences between the systems, and application workloads, which provide an indication of expected end-to-end performance. Our microbenchmark results show that accessing system functionality is often more expensive in Windows for Workgroups than in the other two systems due to frequent changes in machine mode and the use of system call hooks. When running native applications, Windows NT is more efficient than Windows, but it incurs overhead similar to that of a microkernel since its application interface (the Win32 API) is implemented as a user-level server. Overall, system functionality can be accessed most efficiently in NetBSD ; we attribute this to its monolithic structure, and to the absence of the complications created by hardware backwards compatibility requirements in the other systems. Measurements of application performance show that although the impact of these differences is significant in terms of instruction counts and other hardware events (often a factor of 2 to 7 difference between the systems), overall performance is sometimes determined by the functionality provided by specific subsystems, such as the graphics subsystem or the file system buffer cache.

George Deltas - One of the best experts on this subject based on the ideXlab platform.

  • entry order and pricing over the product cycle the transition from the 486 to the Pentium Processor
    International Journal of Industrial Organization, 2006
    Co-Authors: George Deltas, Eleftherios Zacharias
    Abstract:

    Abstract Using a high frequency data set of advertized prices of personal computers we find that prices of Pentium computers of late entrants into this market segment are higher than the contemporaneous prices of their competitors. This is true even among firms which have the same price premium for their 486 computers, but is more pronounced for high quality firms. Over time, the difference in the Pentium computer prices between the early and late entrants declines to the level of the price gap for their 486 computers. In contrast, the entry prices of the late entrants are lower than the entry prices of the early entrants. These results suggest that entry prices of firms are set to extract short run rents from consumers who have a higher willingness to pay for their brand. They also suggest a rapidly declining price premium for quality over the product cycle. We develop a stylized two-period durable goods duopoly model that formalizes this intuition and which produces results consistent with these empirical regularities. In light of these findings, brand coefficients in hedonic regressions using high frequency data should not be interpreted as capturing unobserved quality only.

  • pricing over the product cycle the transition from the 486 to the Pentium Processor
    Social Science Research Network, 1999
    Co-Authors: George Deltas, Eleftherios Zacharias
    Abstract:

    Using a high frequency data-set of advertised prices in the personal computer industry, we find that firms which introduced Pentium computers late in the "buy Direct" segment of the market command a higher price premium compared to early entrants. This is true even among firms which have the same price premium for their 486 computers, but is more pronounced for high quality firms. Over time, the difference in the Pentium price premia of the late versus the early entrants decline to levels of the difference in the corresponding 486 price premia. The decline in the relative Pentium price premia contributes to a decline in overall price dispersion, while price dispersion for 486 computers remains constant. These results suggest that late entrants reap short run rents from these consumers that are loyal enough to them to have waited until their entry in order to purchase. They also suggest a rapidly declining price premium for quality over the product cycle. In light of these findings, brand coefficients in hedonistic regressions using high frequency data should not be interpreted as capturing unobserved quality only.

Pohsiang Hsu - One of the best experts on this subject based on the ideXlab platform.

  • software optimization of video codecs on Pentium Processor with mmx technology
    EURASIP Journal on Advances in Signal Processing, 2001
    Co-Authors: Pohsiang Hsu, K J R Liu
    Abstract:

    A key enabling technology for the proliferation of multimedia PC's is the availability of fast video codecs, which are the basic building blocks of many new multimedia applications. Since most industrial video coding standards (e.g., MPEG1, MPEG2, H.261, H.263) only specify the decoder syntax, there are a lot of rooms for optimization in a practical implementation. When considering a specific hardware platform like the PC, the algorithmic optimization must be considered in tandem with the architecture of the PC. Specifically, an algorithm that is optimal in the sense of number of operations needed may not be the fastest implementation on the PC. This is because special instructions are available which can perform several operations at once under special circumstances. In this work, we describe a fast implementation of H.263 video encoder for the Pentium Processor with MMX technology. The described codec is adopted for video mail and video phone softwares used in IBM ThinkPad.

  • software optimization of h 263 video encoder on Pentium Processor with mmx technology
    International Conference on Multimedia and Expo, 2000
    Co-Authors: Pohsiang Hsu, K J R Liu
    Abstract:

    A key enabling technology for the proliferation of multimedia PCs is the availability of fast video codecs, which are the basic building blocks of many new multimedia applications. Since most industrial video coding standards (e.g., MPEG1, MPEG2, H.261, H.263, etc.) only specify the decoder syntax, there is a lot of room for optimization in a practical implementation. When considering a specific hardware platform like the PC, the algorithmic optimization must be considered in tandem with the architecture of the PC. Specifically, an algorithm that is optimal in the sense of number of operations needed may not be the fastest implementation on the PC. This is because special instructions are available which can perform several operations at once under special circumstances. In this work, we describe a fast implementation of the H.263 video encoder for the Pentium Processor with MMX technology.