Byungho Kim

Performance analysis of output buffers in multistage interconnection networks with multiple paths

Multistage interconnection networks with multiple paths can support higher bandwidth than those of non-blocking networks by passing multiple packets to the same destination simultaneously. In the multiple path networks, the performance of the output buffer affects the whole system performance and is closely coupled with the output traffic distribution i.e. the packet arrival rate at each output link destined to a given output module. Many multiple path networks produce the nonuniform output traffic distribution even if the input traffic pattern is random and uniform. In this paper, performances of the output buffers for several multiple path networks are investigated by our proposed analysis model. It is shown that the output traffic distributions are different with the various multiple path networks and the output buffer performance such as packet loss probability and delay gets better as nonuniformity of the output traffic distribution becomes higher.

A Unified App Architecture for Plug & Play of Smart Phone USB Sensor`s

Performance of smart phones has increased to conduct simple PC functions that has become essential to modern people. With the development of smart phones, not only limited inner sensors but various sensors can be connected through USB. However, there is problem that app needs to downloaded when using each sensor. In this paper, a smart phone unified app structure for USB sensor Plug&Play is presented. The structure was designed to download web pages to use various sensors in one app. Unified app communicated with the platform through ADK accessory protocol and implements structure of delivering sensor ID to the web server and downloading device driver, web page. By measurement test, it was confirmed that download time of web page in unified app was 10 times faster than original download time of original app. By managing various sensors by one app, the app is searched every time the sensor changes in which there is no need for downloading several apps.

Performance analysis of an ATM switch with multiple paths

An ATM switch based on multistage interconnection networks with multiple paths can support higher bandwidth than that of buffered networks with single path by passing multiple packets to the same destination simultaneously. These multiple packets are buffered in the output buffer of the destination. The performance of output buffer in the switch with multiple paths is closely dependent on the output traffic distribution, which is the packet arrival rate at each output link destined to a given output port. As the nonuniformity of the output traffic distribution becomes higher, the performance of the output buffer as like delay and packet loss probability gets better. In this paper, we propose a new self-routing switch architecture with multiple paths called Fly network and analyze the performance of the switching network and the output buffer focusing on the output traffic distribution. It is shown that the Fly network supports best throughput and latency of the output buffer by producing a high degree of the nonuniform output traffic distribution.

Performance analysis of multipath multistage interconnection networks with nonuniform output traffic distribution

Develops the analysis of output buffers in multipath multistage interconnection networks. The delay-throughput performance of output buffers in multipath interconnection networks is closely related to the output traffic distribution, which is the distribution of packet arrival rates at each output link connected to a given output module. Many multipath networks produce nonuniform output traffic distributions, even if the input traffic pattern is uniform. We propose in this paper a performance model for output buffer analysis with respect to such a nonuniform output traffic distribution and analyze the output buffer performance of several multipath networks by our proposed analysis model. It is shown that the output traffic distributions are different for the various multipath networks and the output buffer performance (such as packet loss probability and delay) gets better as the nonuniformity of the output traffic distribution becomes higher.