Hag Young Kim

An Efficient Global Request Dispatching Scheme for Multimedia Streaming Services

For providing high quality multimedia streaming services over high speed network, various solutions such as performance improvement of computer system, efficient cluster management and request dispatching into back-end nodes, good load balancing scheme, global infrastructure management and efficient contents distribution mechanism are required. In this paper, we will describe the global request dispatching scheme in design and implementation aspects for supporting high quality multimedia streaming services in high speed network environments. With this scheme, we can get good performance and correctness in dispatching service requests.

Implementation of system interconnection devices using PCI express

PCI Express is considered as a good candidate for system interconnects due to its fast speed, low power consumption, and good protocol efficiency. In this paper we propose a system interconnection device based on PCI Express for usage in small-scale system interconnect and describe its design, implementation, and early evaluation. The proposed device provides multiple 20 Gbps connections and current testing results show that the throughput reaches maximally 6.797 Gbps without DMA.

Design of a clockless MSP430 core using mixed asynchronous design flow

There are various limitations on the supporting tools and design methodologies for the implementation of an asynchronous delay-insensitive model. In this paper, we propose a new design flow by exploiting a mixed model, which combines a bounded delay model and a delay-insensitive model. To develop the design flow, we use an asynchronous finite-state machine for the bounded delay model and the null convention logic for the delay-insensitive model. Further, we designed an MSP430 core to verify the proposed design flow and the results of simulation show that it exhibits a performance improvement of 30.34% over its synchronous counterpart.

A System Interconnection Device for Small-Scale Clusters

The performance of a physical cluster ultimately depends on two factors. One is the capability of individual computing nodes and the other is the networking speed among them. Recent processors are being greatly developed in terms of enhancing the processing speed while lowering the monetary cost. As for the networking technologies, nowadays dominant solutions have disadvantages such as high installation price and low protocol efficiency. Such drawbacks become the bottleneck of improving the ‘performance per cost’ ratio of the cluster as a whole. This paper proposes an alternative system interconnection device especially for application in small-scale clusters. The non-transparent bridges in PCI Express technology are employed to allow PCI Express packets to directly transmit across networked computing nodes. The performance is measured under two kinds of data transmission schemes, with two different benchmarking tools, respectively. Currently the proposed device delivers a peak unidirectional throughput of 8.6 gigabits per second.