DongJin Lee

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Widely used protocols (UDP and TCP) are observed for variations of the UDP to TCP ratio and of port number distribution, both over time and between different networks. The purpose of the study was to understand the impact of application trends, especially the growth in media streaming, on traffic characteristics. The results showed substantial variability(More)
This paper presents benchmark experiments for designing an optimal archival storage system. The benchmark utilizes archival workloads developed from an analysis of historical file size distributions. The workloads provide more appropriate measurements of system performance as an archive than traditional approaches. We use these benchmarks to measure(More)
Data storage tiers are increasing in size to support the demands for high capacity and performance, and so the tiers with a capacity of hundreds of TB or even PB are becoming more prevalent. The design of a storage tier of this scale is a complex task involving many competing criteria such as capital expenditure (CapEx) and operational expenditure (OpEx).(More)
In this paper, we present a multiplication table game that automatically detects and recognizes handwritten digits written on the white board. The result of the multiplication of two numbers would not only be displayed on the monitor, but it would be also spoken by the Text To Speech (TTS). The proposed application is divided into three stages: 1) detect a(More)
Much work has been done on observing and determining application types for network traffic flows. This is non-trivial because newer applications often encrypt their packets and do not use default port numbers. Also, application updates or protocol changes could vary the distributions of flow behaviors and patterns, resulting in complicated identification(More)
Archival data storage plays a critical role in data preservation as almost all current data will eventually be archived. In addition, the demands placed on archival storage tiers are growing because of large regularly-scheduled backups. Archival storage tiers usually consist of tape-based devices with a large storage capacity, but limited I/O performance(More)
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